• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A highly reliable oil-free screw compressor comprising a first sensor for sensing lubricating oil temperature, second sensors for sensing intake air temperatures, and a cooling fan controller having. a storage portion in which a set temperature of the lubricating oil and a set temperature of the intake air are stored, and a calculation portion for calculating a control signal for increasing the speed of the cooling fan if a detected value of lubricating oil temperature, supplied by the first sensor, exceeds the set value of lubricating oil stored in the storage portion, and to calculate a control signal to increase the speed of the cooling fan if a sensed intake air temperature value, supplied by the second sensor, is greater than the set temperature of intake air, memorized in the memorization portion.
    公开号:BE1018912A3
    申请号:E2008/0358
    申请日:2008-06-27
    公开日:2011-11-08
    发明作者:Hideki Fujimoto；Hitoshi Nishimura
    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 capable of controlling the speed of a cooling fan, and in particular an oil-less screw compressor capable of properly maintaining compressed air and lubricating oil temperatures in response to a variation of the surrounding atmosphere.
    An air-cooled oil-free screw compressor is known to compress air by a pair of male and female screw rotors that can be rotated without contact and without lubrication. The oil-free, air-cooled screw compressor comprises an air-cooled type cooler for cooling the lubricating oil for lubricating bearings, gears and the like, and compressed air having the configuration according to which the atmospheric air is taken internally by means of a fan, in order to effect a heat exchange with the lubricating oil and the compressed air (See, for example, JP A 01 116297).
    Summary of the invention
    An oil-free, air-cooled screw compressor has a compressor body in which a pair of male and female screw rotors are fixed by bearings and rotated by a motor through gears. In addition, the bearings and gears that are used in a control portion, outside or inside the compressor body, are adapted to be fed internally with lubricating oil.
    The oil-free, air-cooled screw compressor of this type is, if possible, installed in a place where the atmospheric temperature varies considerably with respect to its determined specification. In this case, if the temperature of the lubricating oil becomes lower than a suitable temperature, the viscosity of the lubricating oil would be increased, causing a slight increase in the mechanical power loss in the bearings and gears. In addition, increasing the temperature of the lubricating oil would reduce the service life of the lubricating oil itself.
    In addition, even the temperature of the compressed air discharged from the compressor body varies according to the atmospheric temperature; an increase in the temperature of the compressed air caused by an increase in the temperature of the atmospheric air would reduce the service life of the air-cooled type chiller, and in addition, if the temperature of the compressed air exceeds a set temperature of a protective device for the compressor, the compressor will stop to avoid an accident. In addition, if the atmospheric temperature is excessively lower than an appropriate temperature, causing the generation and increase of the condensed water in the compressed air, this would cause a reduction in the volume of production of the compressed air and the breakdowns of the compressed air. equipment inside and outside the compressor.
    In addition, in the air cooled type cooler for the lubricating oil, and the compressed air, as indicated above, the heat exchange is carried out by cooling the air which has been taken from the therefore, if the speed of the cooling fan is constant, this will cause a problem in that the temperatures of the lubricating oil and the compressed air vary according to the temperature of the cooling fan. of the atmospheric temperature.
    The present invention is designed in view of the above-mentioned circumstances, and therefore it is an object of the present invention to provide an unlubricated screw compressor capable of properly maintaining the lubricating oil and air temperatures. with a high degree of reliability even if the atmospheric temperature varies.
    For this purpose, according to a first aspect of the present invention, we propose an oil-free screw compressor comprising a compressor body having a pair of male and female screw rotors which can be rotated without contact and without lubrication, a cooler of the type air-cooled for the compressor lubricating oil, an air-cooled type chiller for compressed air, a cooling fan for supplying cooling air to the compressor body and cooling chillers of air and a cooling fan controller comprising a first sensor for detecting a temperature of the lubricating oil, a second sensor for detecting a temperature of the intake air, a storage portion for storing an established temperature of the lubricating oil and an established temperature of the intake air, and a calculating portion for calculating a signal a control adapted to increase the speed of the cooling fan if a detected temperature value of the lubricating oil, supplied by the first sensor, exceeds the set temperature of the lubricating oil stored in the storage portion, and also for calculating a control signal for increasing the speed of the cooling fan if a detected value of intake air temperature, supplied by the second sensor, exceeds the set temperature of the intake air stored in the storage.
    In addition, a second aspect of the present invention, in the first aspect of the invention, is characterized in that the speed of the cooling fan is controlled by an inverter exclusively used for the cooling fan.
    In addition, a third aspect of the present invention, in the first aspect of the present invention, is characterized in that the speed of the cooling fan is controlled by an inverter for the compressor.
    Furthermore, a fourth aspect of the present invention, in the first aspect of the present invention, is characterized in that the cooling fan controller takes temperatures therein and outside the compressor, so that check the speed of the cooling fan.
    Furthermore, a fifth aspect of the present invention, in the first aspect of the present invention, is characterized in that the cooling fan controller takes a temperature in a control panel as a starter panel to control the temperature. cooling fan speed.
    According to the present invention, even if the atmospheric temperature varies, the temperatures of the lubricating oil and the intake air can be adequately maintained, it is therefore possible to provide an oil-free screw compressor having a high degree of reliability.
    Other objects, features and advantages of the invention will become apparent from the following description of the embodiments of the invention, in combination with the accompanying drawings.
    Brief description of the different views of the drawings
    Fig. 1 is a systematic view illustrating an overall configuration of an oil-free, two-phase air-cooled screw compressor in one embodiment of the present invention;
    Fig. 2 is a view illustrating a configuration of a cooling fan constituting the oil-free, two-phase air-cooled screw compressor in one embodiment of the present invention;
    Fig. 3 is a systematic view illustrating a non-lubricated and air-cooled two-stage screw compressor in another embodiment of the present invention, and
    FIG. 4 is a view of a cooling fan controller constituting the non-lubricated and air-cooled two-stage screw compressor according to the present invention, shown in FIG.
    Detailed description of the invention
    Hereinafter, an explanation will be given of embodiments of the oil-free screw compressor according to the present invention with reference to the accompanying drawings.
    An explanation will be given below of an oil-free screw compressor in one embodiment of the present invention, comprising a compressor body having a pair of male and female screw rotors that can be rotated by a gearing gear. non-contact and non-lubricated distribution, an air-cooled type chiller to cool the compressed air discharged from the compressor body, an air-cooled type chiller to cool the lubricating air of the bearings and gears in the control portions inside and outside the compressor body, and a cooling fan whose speed can be controlled to adjust the volumes of the cooling air fed into these coolers.
    Specifically, we offer an inverter exclusively used for the cooling fan, and a controller for it, and the temperature of the lubricating oil, the temperature of the intake air, the temperatures inside and out. Outside the compressor unit, the temperature in a starter panel is detected by a temperature sensor to control the speed of the cooling fan. In addition, the speed of the cooling fan can be controlled in synchronization with the control of the capacity of the compressor.
    Referring to FIG. 1, which is a systematic view illustrating an overall configuration of an oil-free, two-phase air-cooled screw compressor in one embodiment of the present invention, the oil-less screw compressor 1 comprises, in its housing IA, a first level compressor body 2A and a second level compressor body 2B which are provided in a gear case 3 and each of them is integrated inside with a pair of screw rotors, namely a male rotor 4 and a female rotor 5 fixed thereto with distribution gears 6, 7 in an axial end portion.
    A pinion gear 9 is attached to the male rotor 5 at an axial end thereof. This pinion gear 9 is meshed with a reducer 10 which is connected to a drive shaft. The pinion gear 9 and the pull gear 10 are contained in the gearbox 3. The gearbox 3 comprises, in its lower part, an oil manifold 12.
    In addition, the rotors and drive shafts are supported by bearings 8, respectively. A pulley attached to a portion of the drive shaft having the reducer 10 and a sheave attached to an axial end portion of a motor shaft are wound on and between them with a drive belt 11. A power The output is transmitted by a motor 13 to the compressor bodies 2A, 2B via the driving gears of the compressors 10 and the belt 11.
    With respect to the flow of the compressed air, the atmospheric air that has been withdrawn from the compressor unit is compressed by the single level compressor body 2A, then passes through a discharge duct 6B and is cooled by an air cooler 17A for the first stage compressor body, and flows through a discharge duct 16B. Then it is compressed by the second level compressor body 2B. The compressed air by the second level compressor body 2B flows through a discharge duct 18, then is cooled by the cooler 17B for the second level compressor and then passes through a discharge duct 19, and is fed into a conduit connected to equipment outside the compressor unit. The discharge duct 18 is connected to it with a control valve 15.
    With regard to the flow of lubricating oil, the lubricating oil reserved in the oil collector 12 in the gearbox 3 flows through a lubricating duct 21, is cooled by a cooler 20 for the lubricating oil and then passes through the oil filter 22 which is connected in a lubricating oil pipe 23, and is then fed into the bearings 8 and gears 9, 10 in the control portion comprising the body first level compressor 2a and the second level compressor body 2B.
    The compressor 1 comprises a start and control panel 24 in its housing IA (see the lower left side in Figure 1). In addition, the compressor 1 also includes a cooling fan 25 in its housing IA (see the upper right side in FIG. 1). The speed of the cooling fan 25 is controlled by a motor 26. When the cooling fan 25 is rotated, atmospheric air is drawn into the housing IA through an inlet port 27 in the housing IA. This atmospheric air undergoes a heat exchange through the compressed air coolers 17A, 17B and the lubricating oil cooler 20 after it has cooled inside the unit, and is then discharged from the housing IA through an exhaust port 28 formed in the housing IA.
    The conduit 23 is internally connected with a first sensor for detecting a temperature of the lubricating oil, on the output side of the lubricating oil cooler 20, and the second sensors 30A, 30B for detecting the temperatures of the lubricating oil. intake air are provided on the inlet sides of the first compressor body 2A and the second level compressor body 2B. The detection signals from the sensors 29, 30A, 30B are transmitted to a cooling fan controller 31 which will be detailed later.
    Referring to Fig. 2, it illustrates a configuration of the cooling fan controller 31, which constitutes the oil-free, two-stage air-cooled screw compressor in the embodiment of the present invention, wherein Identical reference numbers are used to represent parts identical to those shown in Figure 1, in order to abbreviate the detailed explanation thereof.
    The cooling fan controller 31 comprises a storage portion 31A, in which an established lubricating oil temperature and a set intake air temperature are stored, and a calculating portion 31B for calculating a control signal enabling increasing the speed of the cooling fan 25 if a detected value of a lubricating oil temperature, supplied by the first sensor 29, is greater than the set temperature of the lubricating oil stored in the storage portion 31A and to also calculate a control signal for increasing the speed of the cooling fan 25 if the detected values of the intake air temperatures, provided by the second sensors 30A, 30B, exceed the set temperature of the air. admission memorized in the storage portion 31A. The control signals from the calculation portion 31B are supplied to the inverter 32 exclusively used for the cooling fan. An output power from the inverter 32 is therefore supplied to the motor 26 for the cooling fan 26, whose speed is thus controlled by the motor 26.
    Hereinafter, an explanation will be given of the operation of the non-lubricated, two-stage air-cooled compressor in the present invention with reference to Figs. 1 and 2.
    The temperature of the lubricating oil is supplied by the first sensor 29 while the intake air temperatures are provided by the second sensors 30A, 30B, and these temperatures are then received by the calculator portion 31B of the controller Due to the influence of the surrounding atmosphere in view of, for example, where the oil-free screw compressor 1 is installed, when the temperature of the lubricating oil is increased to to exceed the set temperature of the lubricating oil stored in the storage portion 31A, the calculation portion 31B of the cooling fan controller 31 provides a control signal to the motor 26 for the cooling fan 25 via of the inverter 32, exclusively used for the cooling fan 25, to increase the speed of the cooling fan 25. Therefore, the speed of the cooling fan As a result, the temperature of the lubricating oil is increased to increase the volume of the cooling air, and therefore, the lubricating oil temperature increase is limited, and it is therefore possible to maintain the lubricating oil at a temperature of appropriate.
    In addition, because of the influence of the surrounding atmosphere where the oil-free screw compressor 1 is installed, etc., when the intake air temperature is increased to a value greater than established temperature of the intake air stored in the storage portion 31A, the calculation portion 31B of the cooling fan controller 31 provides a control signal to the motor 26 of the cooling fan 25 via the inverter , exclusively used for the cooling fan 25, so as to increase the speed of the cooling fan 25. Therefore, the speed of the cooling fan 25 is increased, and therefore, the volume of the cooling air is increased so that to suppress the temperature increase of the intake air, it is therefore possible to maintain the intake air at an appropriate temperature.
    It should be noted in this embodiment that control of the cooling fan in response to an increase in lubricating oil temperature and control of the cooling fan in response to an increase in air temperature of admission, are made by preferring one of the established values. Alternatively, the calculating portion 31B controls the temperatures of the lubricating oil and the intake air so as to maintain the temperatures in predetermined temperature ranges.
    As indicated above, in this embodiment, the temperature of the lubricating oil can be adequately maintained even if the atmospheric temperature varies, and the temperature of the compressed air can be suitably maintained by adequately maintaining the temperature of the lubricating oil. air intake, it is therefore possible to maintain the screw compressor without oil with a high degree of reliability.
    Referring to FIGS. 3 and 4, they illustrate an oil-free, two-stage air-cooled screw compressor in another embodiment of the present invention, in which FIG. 3 is a systematic view illustrating the overall configuration. of the compressor and FIG. 4 is a view illustrating a cooling fan controller for the compressor, and in which like reference numerals are used to represent parts identical to those shown in FIGS. 1 and 3, in order to abbreviate detailed explanation of these.
    In this embodiment, in addition to the control of the cooling fan in response to a temperature increase of the lubricating oil and the control of the cooling fan in response to an increase in the temperature of the intake air, as indicated in the above-mentioned embodiment, we propose a third sensor 33 for detecting the temperatures inside and outside the housing IA and a fourth sensor 34 for detecting a temperature in the start and control panel 24 in the housing IA to control the temperature increases inside and outside the compressor unit and a temperature increase in the start and control panel 24, and detection signals from these sensors 33, 34 are provided to the cooling fan controller 31. Therefore, the cooling fan controller 31 increases the speed of the cooling fan 25 when the detected values exceed the set values, as in the embodiment mentioned above, in order to properly maintain the temperatures outside and inside the compressor unit and the temperature in the compressor unit. the start and control panel 24. It is thus possible to reduce a heat load relative to the motors and equipment in the starter panel.
    In addition, by synchronizing the control of the capacity of the discharged compressed air with the speed control of the cooling fan in the charger indicated in FIG. 1, a compressor with an automatic shutdown function or a compressor controlled by Inverter, the temperature of the lubricating oil, the temperature of the compressed air discharge, the temperature in the compressor unit and the temperature in the start and control panel can be properly maintained. In this case, the configuration in which the cooling fan 25 is rotated at the lowest frequency of the inverter or is stopped after confirmation of a temperature in the unit when the compressor is stopped under control. of capacity, may be proposed.
    Further, in the above-mentioned embodiment, although the speed of the cooling fan 25 is controlled by the inverter 32 exclusively used for the cooling fan 25, the speed of said cooling fan 25 can be controlled by a inverter for the compressor.
    Those skilled in the art should further understand that although the above description has been made based on embodiments of the invention, it is not limited thereto and various changes and modifications may be made thereto without departing from the spirit of the invention and the scope of the appended claims.
    权利要求:
    Claims (5)
    [1]
    An oil-less screw compressor comprising a compressor body having a pair of male and female screw rotors that can be rotated, without contact and without lubrication, an air-cooled type cooler for the lubricating oil. for the compressor, an air-cooled type chiller for compressed air, and a cooling fan for supplying cooling air to the compressor body and the air-cooled type chillers, characterized by a first sensor for detecting a temperature of the lubricating oil; a second sensor for detecting a temperature of the intake air; a cooling fan controller comprising a storage portion in which a temperature is stored. established lubricating oil and an established temperature of the intake air, and a calculating portion for calculating a control signal per making it possible to increase the speed of the cooling fan if a detected value of the temperature of the lubricating oil, supplied by the first sensor, exceeds the set temperature of the lubricating oil stored in the storage portion, and to calculate a control signal for increasing the speed of the cooling fan if a detected value of intake air temperature, supplied by the second sensor, exceeds the set temperature of the intake air.
    [2]
    Oil-free screw compressor according to Claim 1, characterized in that the speed of the cooling fan is controlled by an inverter exclusively used for the cooling fan.
    [3]
    Oil-free screw compressor according to Claim 1, characterized in that the speed of the cooling fan is controlled by an inverter for the compressor.
    [4]
    An oil-free screw compressor according to claim 1, characterized in that the cooling fan controller receives temperatures inside and outside the compressor unit so as to control the speed of the cooling fan. .
    [5]
    An oil-free screw compressor according to claim 1, characterized in that the cooling fan controller receives a temperature in a control panel, such as a starter panel, so as to control the speed of the cooling fan.
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    法律状态:
    优先权:
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    JP2007175412|2007-07-03|
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