比利时专利BE1018905A5 SCREW COMPRESSOR WITHOUT OIL.

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专利摘要:
Lifetime oil-free compressor incorporating water-cooled cooling units for cooling the compressed air discharged from compressor bodies having a pair of male and female screw rotors capable of non-contact and oil-free swivel, the cooling units comprising a plate heat exchanger and the amount of cooling water for the plate heat exchanger being adjustable. With this configuration, a difference between a temperature during the charging operation and a temperature during the automatic shutdown and during the unloading operation of the compressor can be reduced so that the cooling unit cannot be damaged. or broken in a short period of time, thereby providing a very reliable oil-free screw compressor.
公开号:BE1018905A5
申请号:E2007/0243
申请日:2007-05-21
公开日:2011-11-08
发明作者:Hideki Fujimoto；Hitoshi Nishimura；Natsuki Kawabata
申请人:Hitachi Ind Equipment Sys；
IPC主号:

专利说明:

SCREW COMPRESSOR WITHOUT OIL Context of the invention
The present invention relates to an oil-free screw compressor incorporating a heat exchange for cooling compressed air.
An oil-less compressor is already known having a pair of male and female screw rotors that can be rotated by means of non-contact and oil-free timing gears to compress the air. The oil-less compressor has a compressor body for compressing the air and, as the temperature of the compressed air discharged from the compressor body increases, the compressor is incorporated with a cooling unit for cooling the compressed air.
JP-A-3-290089 discloses a single-stage oil-less compressor having such a configuration that a pre-cooler or a final cooler is incorporated as the cooling unit for cooling the compressed air. In this example, an external cooling water is introduced through the cooling unit to cool the compressed air.
JP-A-2001-153080 discloses a two-stage compressor having two compressor bodies. In this compressor, the compressed air from the first stage of the compressor body is cooled by an intercooler and the compressed air from the second stage of the compressor body is cooled by a final cooler, respectively, as cooling units. introduced there in the cooling water. In addition, JP-A-249934 discloses a two-stage compressor in which the compressed air is cooled by a plate heat exchanger.
In a screw compressor, a power required to compress the air is converted into heat and, depending on this, the temperature of the compressed air increases. The temperature of the compressed air becomes extremely high. With respect to the oil-less screw compressor (oil-less compressor), the temperature of the compressed air discharged from the compressor body rises to a temperature of about 300 to 350 ° C in the case of a single-compressor. floor and about 160 to 250 ° C even in the case of the two-stage compressor.
As a cooling unit for cooling compressed air at a high temperature in a water-cooled compressor, a water-cooled multitubular heat exchanger has often been used (as disclosed, for example, by the JP document). -A-2001-153080) both in a single-stage compressor and in a two-stage compressor. In the case of a two-stage compressor, a heat exchanger for cooling compressed air of the low pressure stage and a heat exchanger for cooling compressed air of the high pressure stage are arranged individually.
It has been difficult to miniaturize the water-cooled multitubular heat exchanger with respect to its structure, that is to say that it has been difficult to considerably miniaturize not only the cooling unit itself in the oil-free screw compressor but also the oil-free screw compressor. JP-A-3-290089 discloses an example using a tubular heat exchanger which is also difficult to miniaturize, that is to say that the configuration has been such that its miniaturization thereof is difficult.
Thus, it has been suggested to use the plate heat exchanger, which has a volumetric ratio of about 1/10 to 1/20 with respect to the multitubular heat exchanger, i.e. the miniaturization of it is extremely simple.
However, when using the plate heat exchanger to cool the high temperature compressed air discharged from the compressor compressor body. oil-free screw, its mounting holes, U-sheets, brazed parts between U-plates and cover plates would be deteriorated or broken due to thermal fatigue caused by the temperature difference. In particular, in a compressor that can be controlled in response to user demand, during the automatic shutdown of the compressor or an unloading operation (empty running) thereof, only a small amount of air The tablet remains in the heat exchanger, ie only the cooling water flows through the plate heat exchanger, resulting in a great possibility that a temperature difference will occur. At that time, since the cooling unit would be deteriorated or broken in a short time, this caused the decrease in the reliability of the compressor itself. Summary of the Invention
In view of the aforementioned problems, the object of the present invention is to provide a very reliable oil-free screw compressor in which the deterioration and breakage of a cooling unit is prevented.
To the end, according to a first aspect of the present invention, there is an oil-free screw compressor comprising a water-cooled cooling unit for cooling the compressed air discharged from a compressor body with a pair male and female rotatable screw rotors without contact and without oil, in which the cooling unit is composed of a plate heat exchanger and a quantity of cooling water so that the heat exchanger with plates can be set. Further, according to a second aspect of the present invention, there is an oil-free screw compressor comprising a low-pressure stage compressor body having a pair of male and female screw rotors that can rotate without contact and without oil, to compress the air sucked in therein, a first water-cooled heat exchanger for cooling the compressed air discharged from the low-pressure compressor, a high-pressure stage compressor body for compressing the compressed air cooled by the first heat exchanger and a second water cooled heat exchanger for cooling the compressed air discharged from the body of the high pressure stage compressor in which the first and second heat exchangers are composed of a plate heat exchanger and a quantity of cooling water so that the plate heat exchanger can be adjusted. Further, in the above-mentioned aspects of the present invention, there may be more preferable specific embodiments as follows: (1) the amount of cooling water is adjusted or the cooling water supply is stopped at the automatic shutdown of the compressor (2) the amount of cooling water is set or the cooling water supply is stopped in accordance with a no-load time during a no-load operation.
(3) the amount of cooling water is set or the cooling water supply is stopped, depending on a temperature of the compressed air at an inlet or outlet of the exchanger plate heat, or a temperature of the cooling water at the outlet of the plate heat exchanger.
(4) the oil-free screw compressor in which the plate heat exchanger has a compressed air mounting port and a cooling water mounting port which are disposed on opposite sides, respectively; (5) the cooling water for the plate heat exchanger is introduced therein after cooling the low pressure stage compressor body, the high stage compressor body or both; and (6) the cooling water for the plate heat exchanger is introduced therein after being introduced into a lubricant heat exchanger.
Further, in the second aspect of the present invention, it is preferable that the cooling water for the plate heat exchanger is introduced into the plate heat exchanger to cool the compressed air discharged from the compressor body. high pressure stage after being introduced into the plate heat exchanger to cool the compressed air discharged from the body of the compressor low pressure stage. Alternatively, it is preferable that the cooling water is introduced into the plate heat exchanger to cool the compressed air discharged from the low pressure stage compressor body after it has been introduced into the heat exchanger for to cool the compressed air discharged from the body of the compressor with a high pressure stage.
In addition, in the first or second aspect of the present invention, there is preferably a configuration in which the above-mentioned plate heat exchanger is placed in the compressor body, a gearbox comprising gears for controlling the compressor body, a pipe through which the high temperature compressed air flows or at a position where the waste heat from there is received or in a configuration such that the plate heat exchanger is integrally incorporated with the body of the compressor, the gearbox or the pipe.
According to the present invention, there can be an oil-free screw compressor of very high reliability. Other objects, features and advantages of the invention will emerge from the following description of the embodiments of the invention taken into account at the same time as the accompanying drawings.
Brief description of the drawings:
Fig. 1 is a system diagram illustrating a complete configuration of a water-cooled two-stage oil-free screw compressor according to the present invention;
Fig. 2 is a control block diagram of an embodiment according to the invention;
Fig. 3 is a view showing the variation of pressure during operation;
Fig. 4 is a structural view illustrating a plate heat exchanger used in a cooling unit; and
Fig. 5 is a structural view illustrating a plate heat exchanger used in a cooling unit.
A detailed description of the explanation of the preferred embodiments will be given below for an oil-less screw compressor comprising a compressor body having a pair of male and female screw rotors rotatable by means of non-contact timing gears. and without oil and a cooling unit for cooling the compressed air discharged from the compressor body, wherein the cooling unit for the compressed air is composed of a plate heat exchanger, as an embodiment according to the invention. invention.
In particular, an explanation will be given of this example according to which the thermal fatigue of the plate heat exchanger is reduced by a restriction of the temperature variation of the plate heat exchanger, caused during the automatic shutdown or the shutdown. unloading operation of the compressor, this prevents the plate heat exchanger from deteriorating or breaking.
In particular, there is a means for stopping the supply of cooling water for the plate heat exchanger, or a means for regulating a quantity of it during an automatic shutdown or an unloading operation. of the compressor. The cooling water amount adjusting means is capable of stopping the cooling water supply for the plate heat exchanger or adjusting the quantity thereof during compressor shutdown, depending on the cooling water quantity. information concerning one of the unloading times, a water cooling temperature or a temperature of the compressed air, by means of a selector or an adjustment valve connected to a cooling water pipe .
One of the typical parts that could be damaged or broken due to thermal fatigue in the plate heat exchanger is mounting holes subjected to a large temperature variation. Each mounting hole is in a cover plate covering the associated plate. It is preferable that the mounting hole for the compressed air and the mounting hole for the cooling water are not on one and the same cover plate but are arranged opposite one of the 'other.
In order to reduce the temperature variation of the plate heat exchanger during the unloading operation, the cooling water can be introduced into the plate heat exchanger after the introduction of the cooling water into the heat exchanger. lubricant heat exchanger and alternatively when using the cooling water to cool the compressor body, the cooling water is introduced to the interior after the cooling water enters an envelope refrigerant compressor body or after the introduction of the latter in both.
In addition, the plate heat exchanger should limit the temperature variation thereof during the automatic shutdown or the compressor unloading operation, and depending on this, the following configuration should be used: that is, the plate heat exchanger is arranged in the vicinity of the compressor body, the gearbox incorporating gears for controlling the compressor, wherein the additional heat remains due to the heat lost in the compressor. compressor unit and a pipe through which the high temperature compressed air flows or with which the plate heat exchanger is integrally incorporated. An explanation of a specific embodiment will be given below with reference to the drawings.
Fig. 1 is a system diagram illustrating a complete configuration of an oil-free, water-cooled two-stage screw compressor in the present embodiment. The water-cooled two-stage screw compressor 1 comprises a low-pressure stage compressor body 2 and a high-stage compressor body 3, coupled with a gearbox 4. Each of the two stage compressor bodies low pressure 2 and high pressure stage 3 is incorporated in with a pair of screw rotors, it is a male rotor 5 and a female rotor 6. These rotors are fixed at their axial end with the gears of synchronization 7, 8.
The male rotor 5 is fixed at its axial end with a synchronizing gear 9 which is meshed with a toothed gear 10 fixed to a shaft of a motor 12. The synchronizing gear 5 and the toothed gear 10 are housed without the gear. gearbox 4, a lower part of which serves as an oil reservoir 11. On the other hand, the end of the shaft fixed on it with the toothed gear 10 is coupled to the motor shaft 12 via By using these compressor drive gears, the output power of the motor 12 is transmitted to the compressor body.
Note that some of the reference numerals in Fig. 1 are followed by "a" and "b", indicating that these elements are respectively part of the low-stage compressor body 2 and the high-stage compressor body. pressure 3.
The low pressure stage compressor body 2 is connected to the air suction side (in the upper part) thereof with a throttle valve 13 for adjusting the amount of air drawn into the compressor body. to screw. Thus, by adjusting the throttle valve 13, the amount of air to be compressed can be adjusted.
In addition, an air passage is formed by a pipe, so that the air sucked into the screw compressor 1 is compressed and is then discharged. That is, the air supplied from the suction port in the low pressure stage compressor body 2 by means of the throttle valve 13 is compressed by rotation of the pair of rotors. and is then introduced into a discharge line 14 on the exhaust side of the compressed air. Then, the air is introduced into the high pressure stage compressor body 3 by means of a discharge pipe 16 connected to the suction orifice of the high-pressure stage compressor body 3. The air introduced into the the compressor body with a high pressure stage 3 is then compressed and then discharged from the discharge orifice into a discharge pipe 17 on the discharge side of the compressed air, from which the compressed air is introduced into a pipe exhaust pipe 32 connected to an external supply side pipe (not shown) of the compressor unit 1.
The evacuation duct 14 on the evacuation side of the compressed air of the low pressure stage compressor body 2 is connected to a heat exchanger 15 for the compressed air of the low pressure stage which is composed of a heat exchanger. plate heat, ie, the plate heat exchanger is used as the heat exchanger 15 for the compressed air of the low pressure stage. In addition, the exhaust duct 16 on the secondary side of the heat exchanger 15 is connected to the suction port of the high-pressure compressor body 3. That is, the heat exchanger plate heat as a cooling unit is connected in the connection passage between the low pressure stage compressor body 2 and the high stage compressor body 3.
The discharge orifice of the high-pressure stage compressor body 3 is connected to the heat exchanger 19 for the compressed air of the high-pressure stage which is composed of a plate heat exchanger, through a non-return valve 18 by means of the exhaust pipe 17.
Depending on this, a secondary discharge line 32 of the plate heat exchanger 19 for the compressed air of the high pressure stage is connected to the external supply line (not shown) of the compressor 1. That is, the plate heat exchanger is incorporated in the passage between the high-stage compressor body 3 and a fitting for external equipment.
In the meantime, the cooling water is introduced from an outer part of the unit, after having circulated through the lubricant heat exchanger 22, the casings 23 for the low pressure stage compressor body 2 and the high pressure stage compressor body 3, the plate heat exchanger for the compressed air of the low pressure stage and the plate heat exchanger 19 for the compressed air of the high pressure stage and is then discharged outside the cooling unit 1. Thus, the heating parts and the compressed air are cooled by the cooling water.
It is noted that there is a discharge pipe 33 for the compressed air of the low pressure stage and a discharge pipe 34 for the compressed air of the high pressure stage respectively in the pipes downstream of the heat exchanger 15 and heat exchanger 19 for external evacuation.
The lubricant that is retained in the oil reservoir 11 in the lower part of the gearbox 4 is sucked by a strainer 25 to remove the unnecessary materials when an oil pump 24 is actuated.
Then, the lubricant passes through the lubricant heat exchanger 22 and an oil filter 26 so as to grease the gears and bearings (not shown) in the compressor bodies, gears in the gearbox 4 and other things similar and is then returned to the oil reservoir 11 in the lower part of the gearbox 4. By heat exchange with cooling water in the circulation passage of the aforementioned lubricant, the lubricant is cooled then introduced in many pieces. It will be noted that, as shown in FIG. 1, a fan 30 is provided for the ventilation of the air in the unit and, as a result, the ambient air is conducted inside and removed from the unit. by the fan 30.
In the water-cooled two-stage oil-less screw compressor 1 as previously indicated, the torque of the motor 12 is transmitted to the male rotor 5 through gears such as the toothed gear 10 and the pinion gear. 9 to control the compressor. The torque transmitted to the male rotor 5 is transmitted to the female rotor 6 via the synchronizing gears 7, 8 and, as a result, the male rotor 5 and the female rotor 6 are pivoted, not being brought into contact with each other. with each other so that the ambient air is sucked into the compressor body by the suction filter 27 and the throttle valve 13 and is compressed to a predetermined pressure. This compressed air is cooled with the aforementioned configuration and is introduced on the supply side.
It will be noted in FIG. 1 that the flow of the compressed air, the lubricant flow, the flow of the cooling water and the flow of the cooling air by the fan 30 are respectively indicated. by the arrows.
Referring to Fig. 2 which is a control block diagram of the water-cooled two-stage oil-free screw compressor in this embodiment, in the oil-free screw compressor 1 cooled by the in this embodiment, the motor 12, the fan 30 and the oil pump 24 are turned on so as to be controlled by a control panel (control panel) 40 and then they are turned on when a capacitive solenoid valve is switched to open a suction valve. When the motor 12 is actuated, the low pressure stage compressor body 2 and the high stage compressor body 3 are controlled by the gear elements as indicated above and, depending on this, the sucked air inside is compressed.
With reference to FIG. 3 which shows a pressure variation during the operation, at start-up, the outlet pressure of the compressor 1 increases. Then, during the loading operation, the operation is continued at an outlet pressure P2 and, depending on this, high pressure air is supplied to the user side material.
During the loading operation, in a situation where the air is sufficient on the user side, the pressure increases in the discharge pipe 32. At this time, when the pressure detected by a pressure sensor ( shown in Figure 2) to detect a pressure in the discharge pipe, reaches a pressure Pi set as a value higher than the pressure P2, this can be recognized as an overload situation and depending on this, the capacitive solenoid valve is controlled to perform the unloading operation. The control member 40 specifically closes the throttle valve 13 but opens a vent valve 28 under control. During this unloading operation, the outlet pressure becomes P4 so that the motor 12 continues its idle rotation. It should be noted that it is possible to use, if necessary, an automatic shutdown function so that the motor stops once the time of the unloading operation has elapsed past a predetermined time.
The air is used on the user side and as a function of this, when the detected pressure falls to a pressure P3 defined as a value lower than the pressure P2, the control part 40 again controls the capacitive solenoid valves (such as the throttle valve 13 , the vent valve 28 and the like) to perform a loading operation with the outlet pressure P2. As a result, depending on the degree of user-side air consumption, the loading / unloading operation is repeated. That is, the control member 40 controls the capacitive solenoid valves to form a loading and unloading cycle. As shown in Figure 3, it goes without saying that the relation Pi> P2> P3> P4 is defined.
In addition, although a detailed description is omitted, the speed of the motor 12 can be changed according to an air consumption value if incorporating an inverter.
A detailed explanation of the cooling unit in this embodiment will be given below. Figure 4 shows a structural view illustrating the plate heat exchanger used as a heat exchanger for compressed air.
The plate heat exchanger 35 used as a cooling unit in this embodiment is composed of two cover plates 36 and U-plates 37 formed of an extremely thin stainless sheet. They are brazed with each other by copper or similar material. The U-plates 37 are interposed specifically between the cover plates 36 surrounding the former on both sides. The compressed air and the cooling water are fed into the pipes through the mounting holes 38. The compressed air and the cooling water are alternately conducted between the U-shaped plates 37 so as to effect the heat exchange. between them. On the other hand, the U-shaped sheets 37 are formed here with a chevron pattern, that is, the U-shaped sheets are formed here with complicated passages alternately superimposed on one another. With these complicated passages, the heat exchange rate can be improved to allow miniaturization of the heat exchanger.
In the case of an oil-free screw compressor, the compressed air having an extremely high temperature flows through during the charging operation and, depending on this, it can be effectively cooled by the heat exchanger with plates like the cooling unit. In the meantime, during the unloading operation, the compressed air in the discharge line between the check valve and the compressor body is vented outwardly from a muffler valve 29 through the opening of the ventilation valve 28 so as to perform an unloading operation. During the automatic shutdown or during the compressor unloading operation, the cooled air is returned to a check valve 19 from the lateral supply line.
In addition, in this situation, if the cooling water is continuously introduced into the plate heat exchanger, a repeated stress is caused, because of temperatures with the frequent repetitions of this type of operation. The repeated stress due to the temperatures would cause damage or breakage on the abraded parts between the U-plates 37, the U-plates 37, the cover plates 36 and the mounting holes 38 through which the high temperature compressed air passes. first because of differences in the thermal coefficients of thermal expansion and contraction. Thus, it is difficult to use the plate heat exchanger under the aforementioned repeated stress caused by high temperatures.
For example, the temperature of the compressed air discharged from the high-stage compressor body 3 of the 75 kW two-stage compressor rises to 200 ° C during the loading operation. However, the air which has been cooled to a value almost equal to the atmospheric temperature is returned from the lateral supply pipe to the non-return valve 18 during the automatic shutdown or during the unloading operation. compressor. Thus, if the cooling water flows continuously through the plate heat exchanger even during the automatic shutdown or during the unloading operation of the compressor, it will soon cause the aforementioned deterioration or breakage.
According to this, according to the capacitive control, that is to say that the amount of cooling water is controlled so as to be reduced during the unloading operation, the reliability of the heat exchanger can be improved. For example, the temperature sensor 20 is incorporated to detect a temperature of the cooling water or a temperature of the compressed air. On the other hand, the control part adjusts the amount of cooling water as a function of the value sensed in this way, which limits the deterioration and breakage of the plate heat exchanger.
More specifically, the amount of cooling water flowing through the plate heat exchanger is adjusted according to a temperature of the cooling water at the outlet of the plate heat exchanger or a temperature primary or secondary side compressed air detected by the temperature detector 20 (shown in FIG. 1). In this way, the variation of the temperature of the plate heat exchanger is limited during the automatic shutdown or during the unloading operation of the compressor so as to reduce the thermally induced repeated stress. Thus, it is possible to provide a configuration such that the deterioration or breakage of the plate heat exchanger can be avoided. The temperature sensor 20 may be provided to detect a temperature of the cooling water below the heat exchanger 15 or the heat exchanger 19 or to detect a temperature of the compressed air. It is tolerated to provide three-position temperature detectors as shown in Figure 1.
Instead of providing temperature sensors 20 as indicated above, the amount of cooling water can be controlled on the basis of a value detected by a pressure sensor. Because an unloading operation is carried out if an outside evacuation pressure Pi of water discharge outside is detected by the pressure sensor so as to determine an overload situation and, as a result, if the amount of cooling water is reduced at this time, it is possible to obtain the similar effect.
The amount of cooling water is controlled by continuous control or on-off control using control equipment such as the electric valve 21 shown in Fig. 1, a solenoid valve or a temperature controller. On the other hand, the amount of cooling water can be adjusted according to one or all of the operating states of the compressor, such as starting or stopping the compressor, loading or unloading the compressor, and operating time of it.
As shown in FIG. 1, a configuration is provided such that the cooling water is introduced into the plate heat exchanger 15 for the compressed air of the low pressure stage and the plate heat exchanger 19 for the compressed air of the high pressure stage after flow through the lubricant heat exchanger 22 and the cooling jacket 23 for the compressor bodies during the automatic shutdown or during the unloading operation of the compressor. It may be that not only one water cooling system but also a plurality of water cooling systems are provided. By limiting the variation of the temperature of the plate heat exchanger and setting this number of water cooling systems and a flow order of the cooling water to maintain the cooling capacity, the frequency of Operation of control equipment such as the electric valve 21, the solenoid valve or the temperature controller can be limited, which also reduces the load on the control equipment.
In addition, in the configuration of the plate heat exchanger, instead of a configuration, as shown in Figure 4, where the mounting holes 38 for compressed air and cooling water are provided on a only one and same cover plate 36, it may be preferable to use this configuration in which, as shown in Figure 5, the mounting holes for compressed air and cooling water are provided in the different cover plates 36, respectively.
The mounting hole 38 is one of those that would often be damaged, that is, it would probably be damaged or broken due to thermal fatigue in the connecting piece between the mounting hole 38 and the cover plate 36. With the installation of the mounting aperture 28 of the plate heat exchanger through which first flows the high temperature compressed air and the mounting hole and the mounting port 38 for the cooling water in the respective different cover plates 36, the temperature difference between the mounting hole 38 and the cover plate 36 is limited, which allows to evade the deterioration or breaking of the mounting holes 38.
Note that the plate heat exchanger is fixed in such a position that it is quite possible to receive the lost heat inside the compressor unit. With this configuration, the plate heat exchanger can prevent its temperature from falling suddenly during the automatic shutdown and during the compressor unloading operation so as to reduce a load on the plate heat exchanger.
In view of the embodiments indicated above, in the oil-free screw compressor in which the temperature of the compressed air increases, it is possible to use a plate heat exchanger. On the other hand, compared to a traditional multitubular heat exchanger, the volume of the plate heat exchanger can be considerably reduced and, depending on this, it is possible to reduce the constraints on the installation of the heat exchanger. of heat in the unit. Thus, the degree of freedom of implantation of the connecting pipes between the heat exchangers and the compressor bodies can be improved and, in addition, the length of the path of the pipe can be shortened, this makes it possible to aspire to miniaturize the Overall size of the unit and reduce the number of components needed.
Therefore, when using a plate heat exchanger as a heat exchanger for cooling compressed air in an oil-free screw compressor in which the temperature rises, it is possible to avoid deterioration and breakage. caused by thermal fatigue by adjusting the amount of cooling air flowing through the plate heat exchanger. In addition to the adjustment of the amount of cooling water, it is possible to use a configuration such that a variation of the temperature of the plate heat exchanger can be limited so as to limit the frequent operation of the valve switching the cooling water or the regulator, thus avoiding damage or breaking control equipment.
It is noted that by using an inverter so that the speed of the motor 12 is variable, the amount of cooling water can be controlled according to the speed of the motor 12.
Those skilled in the art should further understand that, although the above description has been given for the embodiments of the invention, the invention is not limited to these and various changes and modifications can be made. without departing from the spirit of the invention and the scope of the appended claims.

权利要求:
Claims (22)
[1]
An oil-free screw compressor, comprising a water-cooled cooling unit for cooling the compressed air discharged from a compressor body having a pair of male and female screw rotors that can rotate without contact and without oil, in wherein said cooling unit is equipped with a plate heat exchanger and an amount of the cooling water in said plate heat exchanger is adjustable.
[2]
An oil-free screw compressor comprising: a low pressure stage compressor body having a pair of male and female screw rotors that can be rotated without contact and without oil to compress the air sucked in therein, a first heat exchanger water cooled for cooling the compressed air discharged from said low pressure stage compressor body, a high pressure stage compressor body for compressing the compressed air cooled by said first heat exchanger, and a second cooled heat exchanger by water to cool the compressed air discharged from said high pressure stage compressor body, wherein said first and second heat exchangers are equipped with plate heat exchangers and the amounts of cooling water in said heat exchangers. plate heat are adjustable.
[3]
An oil-free screw compressor according to claim 1, wherein the amount of cooling water is adjusted or the flow of cooling water is stopped during the automatic compressor shutdown.
[4]
An oil-free screw compressor according to claim 2, wherein the amount of cooling water is adjusted or the flow of the cooling water is stopped at the automatic shutdown of the compressor.
[5]
An oil-free screw compressor according to claim 1, wherein the amount of cooling water is adjusted or the flow of cooling water is stopped in accordance with a period of unloading operation during the unloading operation. .
[6]
An oil-free screw compressor according to claim 2, wherein the amount of cooling water is adjusted or the flow of cooling water is stopped in accordance with a period of unloading operation during the operation of unloading.
[7]
An oil-free screw compressor according to claim 1, wherein the amount of cooling water is adjusted or the flow of cooling water is stopped according to a compressed air temperature at an inlet port or output of said plate heat exchanger or a temperature of the cooling water to an outlet of said plate heat exchanger.
[8]
An oil-free screw compressor according to claim 2, wherein the amount of cooling water is adjusted or the flow of cooling water is stopped according to a temperature of compressed air at an inlet port or output of said plate heat exchanger or a temperature of the cooling water to an outlet of said plate heat exchanger.
[9]
The oil-free screw compressor according to claim 1, wherein said plate heat exchanger has a mounting port for the compressed air and a mounting port for the cooling water and said mounting port for the water. and said mounting port for compressed air are placed on opposite sides, respectively.
[10]
An oil-free screw compressor according to claim 2, wherein said plate heat exchanger has a mounting port for the compressed air and a mounting port for the cooling water and said mounting port for the water. and said mounting port for compressed air are placed on opposite sides, respectively.
[11]
An oil-free screw compressor according to claim 1, wherein the cooling water is introduced into said plate heat exchanger after cooling said low pressure stage compressor body or said high stage compressor body or both. .
[12]
An oil-free screw compressor according to claim 2, wherein the cooling water is introduced into said plate heat exchanger after cooling said low pressure stage compressor body or said high stage compressor body or both. .
[13]
An oil-free screw compressor according to claim 1, wherein the cooling water for said plate heat exchanger is introduced therein after passing through a lubricant heat exchanger.
[14]
An oil-free screw compressor according to claim 2, wherein the cooling water for said plate heat exchanger is introduced therein after passing through a lubricant heat exchanger.
[15]
The oil-free screw compressor according to claim 2, wherein the cooling water for said plate heat exchangers is introduced into the plate heat exchanger to cool the compressed air discharged from said high stage compressor body. pressure after passing through the plate heat exchanger to cool the compressed air discharged from said low pressure stage compressor body.
[16]
The oil-free screw compressor according to claim 2, wherein the cooling water for said plate heat exchangers is introduced into the plate heat exchanger to cool the compressed air discharged from said high stage compressor body. pressure after passing through the plate heat exchanger to cool the compressed air discharged from said low pressure stage compressor body.
[17]
An oil-free screw compressor according to claim 1, wherein said plate heat exchanger is disposed in said compressor body, a gearbox in which are housed gears for controlling said compressor body, a pipe through which flows from the high temperature compressed air or to a position where the water which is rejected is received.
[18]
An oil-free screw compressor according to claim 2, wherein said plate heat exchanger is disposed in said compressor body, a gearbox in which gears are housed for controlling said compressor body, a pipe through which flows from the high temperature compressed air or to a position where the water which is rejected is received.
[19]
The oil-free screw compressor of claim 17, wherein said plate heat exchanger is integrally incorporated with said compressor body, said gearbox, or said conduit.
[20]
The oil-free screw compressor of claim 18, wherein said plate heat exchanger is integrally incorporated with said compressor body, said gearbox, or said conduit.
[21]
An oil-free screw compressor according to claim 1, wherein the amount of cooling water is adjusted or the flow of cooling water is stopped, according to a pressure of compressed air on an inlet port or output of said plate heat exchanger or a temperature of the cooling water to an outlet of said plate heat exchanger.
[22]
An oil-free screw compressor according to claim 2, wherein the amount of cooling water is adjusted or the flow of cooling water is stopped, according to a pressure of compressed air on an inlet port or the outlet of said plate heat exchanger or a temperature of the cooling water at an outlet of said plate heat exchanger.

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FR2514114A1|1983-04-08|CLOSED CIRCUIT OF HEAT OR COLD PUMP

FR2636100A1|1990-03-09|FLUID COMPRESSOR AND REFRIGERATION SYSTEM

EP2199709A2|2010-06-23|Device comprising an internal heat exchanger and an accumulator

FR2668551A1|1992-04-30|APPARATUS AND COMPRESSOR WITH VOLUME AND REFRIGERATION SYSTEM.

WO2010097537A1|2010-09-02|Device for separating a lubricant from a refrigerant lubricant/gas mixture discharged from at least one refrigerating compressor

JP5568591B2|2014-08-06|Oil-free screw compressor

JP6971951B2|2021-11-24|Refrigeration equipment

EP2034256B1|2011-04-06|Method and apparatus for equalizing oil between compressors

FR2694602A1|1994-02-11|Mechanical safety system for the interruption of oil circulation in a screw compressor.

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WO2004008049A1|2004-01-22|Expansion member for a motor vehicle air-conditioning unit cooling circuit

FR2756877A1|1998-06-12|HERMETIC COMPRESSOR FOR GAS CIRCULATION

FR3108952A1|2021-10-08|AIRCRAFT TURBOMACHINE ASSEMBLY INCLUDING AN IMPROVED BLOWER DRIVE REDUCER LUBRICATION SYSTEM

同族专利:

公开号 | 公开日

US7988435B2|2011-08-02|

CN104863852A|2015-08-26|

US20080166253A1|2008-07-10|

US20110243781A1|2011-10-06|

US9057374B2|2015-06-16|

CN101216038A|2008-07-09|

JP2008163926A|2008-07-17|

JP5110882B2|2012-12-26|

引用文献:

公开号 | 申请日 | 公开日 | 申请人 | 专利标题

JP2001153080A|1999-11-22|2001-06-05|Hitachi Ltd|Water-cooled type oil free screw compressor|

EP1138948A2|2000-03-27|2001-10-04|Kabushiki Kaisha Toyoda Jidoshokki Seisakusho|Cooling apparatus for vacuum pump|

JP2006249934A|2005-03-08|2006-09-21|Hitachi Industrial Equipment Systems Co Ltd|Oil-less screw air compressor|

JP2703319B2|1989-03-09|1998-01-26|株式会社日立製作所|Combined compressor|

JP2763377B2|1990-04-05|1998-06-11|株式会社日立製作所|Single-stage oil-free compressor|

JP3040071B2|1996-04-17|2000-05-08|本田技研工業株式会社|Cooling device for compressor|

JP3767052B2|1996-11-30|2006-04-19|アイシン精機株式会社|Multistage vacuum pump|

JP3838595B2|1997-06-27|2006-10-25|オリオン機械株式会社|Water-cooled condenser and air dryer|

JP3718057B2|1998-06-15|2005-11-16|株式会社クボタ|Ozone circulation cleaning system for plate heat exchanger|

JP4003378B2|2000-06-30|2007-11-07|株式会社日立プラントテクノロジー|Screw compressor|

JP3817420B2|2000-10-31|2006-09-06|株式会社日立産機システム|Variable rotational speed oil-free screw compressor and operation control method thereof|

JP5110882B2|2007-01-05|2012-12-26|株式会社日立産機システム|Oil-free screw compressor|WO2007078418A2|2005-12-23|2007-07-12|Exxonmobil Upstream Research Company|Multi-compressor string with multiple variable speed fluid drives|

JP5110882B2|2007-01-05|2012-12-26|株式会社日立産機システム|Oil-free screw compressor|

EA201170677A1|2008-11-12|2011-10-31|Эксонмобил Апстрим Рисерч Компани|BALLOON-COMPRESSOR METHODS AND SYSTEMS|

GB0821275D0|2008-11-20|2008-12-31|Aaf Mcquay Inc|Screw compressor|

JP5452908B2|2008-11-28|2014-03-26|株式会社日立産機システム|Oil-free screw compressor|

JP5248373B2|2009-03-11|2013-07-31|株式会社日立産機システム|Water jet air compressor|

JP5495293B2|2009-07-06|2014-05-21|株式会社日立産機システム|Compressor|

JP5542468B2|2010-02-10|2014-07-09|株式会社日立産機システム|Water-injected scroll air compressor|

BE1019277A3|2010-04-07|2012-05-08|Atlas Copco Airpower Nv|COMPRESSOR AND METHOD FOR CONTROLLING A COMPRESSOR.|

JP5798331B2|2011-02-08|2015-10-21|株式会社神戸製鋼所|Water jet screw compressor|

JP2013083371A|2011-10-06|2013-05-09|Hitachi Industrial Equipment Systems Co Ltd|Screw compressor|

JP5775793B2|2011-11-02|2015-09-09|株式会社日立産機システム|Oil-free air compressor and control method thereof|

JP5774455B2|2011-11-30|2015-09-09|株式会社日立産機システム|oil-free compressor|

CN102606453A|2012-03-17|2012-07-25|山东新巨龙能源有限责任公司|Lubricating oil quick cooling device of mining underground concentrated refrigerating system and working method of lubricating oil quick cooling device|

US20130251555A1|2012-03-26|2013-09-26|Pedro Ismael DePAZ|Power system arrangement|

JP5827172B2|2012-05-22|2015-12-02|株式会社日立産機システム|Screw compressor|

US10578339B2|2013-01-28|2020-03-03|Hitachi Industrial Equipment Systems Co., Ltd.|Waste-heat recovery system in oil-cooled gas compressor|

JP6078361B2|2013-01-30|2017-02-08|株式会社日立産機システム|air compressor|

JP6350815B2|2014-08-27|2018-07-04|三浦工業株式会社|Heat recovery system|

JP2016079894A|2014-10-17|2016-05-16|三浦工業株式会社|Heat recovery system|

CN105221432A|2015-10-27|2016-01-06|无锡压缩机股份有限公司|There is the screw compressor system of organic Rankine bottoming cycle|

CN106050657A|2016-08-01|2016-10-26|珠海格力电器股份有限公司|Screw compressor and multistage screw drive structure thereof|

JP6533196B2|2016-08-03|2019-06-19|株式会社日立産機システム|Gas compressor|

EP3315778B1|2016-10-28|2020-05-06|ALMiG Kompressoren GmbH|Oil-injected screw air compressor|

CN106762644A|2017-03-02|2017-05-31|奥夫尔科精铸机械（昆山）有限公司|A kind of multiple compression helical-lobe compressor|

EP3628868B1|2017-03-07|2021-02-24|ATLAS COPCO AIRPOWER, naamloze vennootschap|Compressor module for compressing gas and compressor equipped therewith|

BE1024644B1|2017-03-07|2018-05-14|Atlas Copco Airpower Naamloze Vennootschap|Compressor module for compressing gas and compressor equipped with it|

DE102017107601B4|2017-04-10|2019-11-07|Gardner Denver Deutschland Gmbh|Method for controlling a screw compressor|

CN107013464A|2017-06-08|2017-08-04|浙江德拉戈机械有限公司|A kind of asynchronous integral screw-rod air compressor|

JP6713439B2|2017-09-06|2020-06-24|株式会社日立製作所|Refueling air compressor|

US20210310702A1|2018-09-28|2021-10-07|Daikin Industries, Ltd.|Multistage compression system|

BE1027005B9|2019-01-30|2020-10-19|Atlas Copco Airpower Nv|Method of controlling a compressor to an unloaded state|

CN112377414A|2020-11-13|2021-02-19|埃尔利德智能科技有限公司|Dual-motor two-stage compression screw air compressor efficiency control system, method and equipment|

法律状态:

优先权:

申请号 | 申请日 | 专利标题

JP2007000304|2007-01-05|

JP2007000304A|JP5110882B2|2007-01-05|2007-01-05|Oil-free screw compressor|

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