• 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:
    In an oil-cooled air compressor for controlling a temperature of a lubricant by changing a flow rate of a cooling medium supplied to a heat exchanger for the lubricant, to achieve an energy saving effect by controlling variable flow rate of the cooling medium and reliably prevent the occurrence of condensed water in a compressor unit, even when an exhaust duct is improperly arranged, a lubricant flow rate adjusting device is provided to measure a lubricant temperature and decrease a lubricant flow rate supplied to the heat exchanger so that the lubricant temperature becomes T1 to satisfy TO> T1> TD when TO is a lubricant control temperature and TD is a critical temperature appearance of condensed water to which condensed water appears in the compressor.
    公开号:BE1018908A3
    申请号:E2008/0118
    申请日:2008-02-28
    公开日:2011-11-08
    发明作者:Hidearu Tanaka；Masahiko Takano；Akihiro Nagasaka
    申请人:Hitachi Ind Equipment Sys；
    IPC主号:
    专利说明:

    OIL COOLING AIR COMPRESSOR Background of the Invention
    The present invention relates to an oil-cooled air compressor.
    In the oil-cooled air compressor, it is possible to prove that when a temperature of the air discharged from the compressor decreases to a value no greater than a critical temperature of occurrence of condensed water, a component of Gas water is condensed into water so that a rust forms in the compressor. Therefore, a lubricant temperature control is important and in the prior art a type of lubricant temperature control in which a flow rate of the lubricant flowing through a heat exchanger adjusted to the lubricant temperature measured by a lubricant device. Adjusting the lubricant flow rate in a lubricant passage is mainly used.
    On the other hand, in recent years, an inverter control of the cooling fan to cool the lubricant has been improved in terms of energy saving and fan noise reduction, cooling. This is a type in which the flow rate of a cooling medium supplied to the heat exchanger is adjusted according to the lubricant temperature measured by a temperature sensor or the like, for example, in JP-A 6-213 186, a cooling air flow rate supplied to the heat exchanger for the lubricant is adjusted according to the lubricant temperature measured by the temperature sensor arranged at the lubricant passage to maintain the lubricant temperature. constant so that the condensed water can not form in the compressor.
    Brief summary of the invention
    An energy not less than 80% of the electricity consumed by the air compressor is removed from the air compressor in the form of lost energy, for example an energy of not less than 80 kW is removed from the air compressor of the air compressor. 100 kW. Therefore, when the air compressor in which the lubricant is cooled by atmospheric air as a cooling medium for the heat exchanger is arranged in a closed air compressor part, the heat energy generated The compressor must be discharged from the compressor room through a vent pipe or the like to maintain the temperature in the desired compressor room.
    In general, the low flow resistance vent is required to facilitate the evacuation of heat energy from the air compressor (exhaust of the cooling fan) but when the exhaust duct has a high flow resistance for a reason caused by equipment requirement or the like, a ventilation fan must be arranged at an exhaust outlet of the exhaust duct.
    In this regard, when the ventilation fan is arranged at the exit port of the exhaust duct, a clearance between a lower intake end of the exhaust duct and a discharge port of the compressor must be big enough. When the clearance is sufficient, the cooling air flows in excess to the lubricant heat exchanger compared to a case where the cooling air flow is generated only by the cooling fan without the cooling fan. ventilation fan, so that excessive cooling causes the problematic appearance of condensed water.
    In addition, it is possible to prove that a strong wind makes the atmospheric air flow back through an outlet end of the vent pipe arranged incorrectly, so that the heat exchanger is excessively cooled to cause the appearance condensed water, even when the exhaust duct does not include the ventilation fan.
    As discussed above, there is a possibility to prove that the excessive cooling is caused by the arrangement of the air compressor, even when the amount of the heat exchange is adjusted to limit the occurrence of condensed water in the air compressor. But the problem caused by an external environment as mentioned above is not taken into account in JP-A-6-213186.
    An object of the present invention achieved with the consideration of the above problem is to provide an oil-cooled air compressor in which the appearance of condensed water is limited independently of the external environment of the compressor. air.
    To achieve the object, in one aspect of the invention, an oil-cooled air compressor comprises a heat exchanger for a lubricant and a compressor body compressing air, wherein a flow rate of a medium supplied to the heat exchanger is continuously adjusted to ensure that a lubricant temperature is not lower than a control temperature TO, the compressor -comprising further a lubricant flow rate adjusting device for measuring the lubricant temperature and reducing the flow rate of the lubricant supplied to the heat exchanger, so that the lubricant temperature does not become lower than T1 and TO> T1 TD, TD being a critical temperature of water appearance condensed water to which condensed water appears in the compressor body. It is preferable that the cooling medium is atmospheric air.
    In another aspect of the present invention, an oil-cooled air compressor comprises an oil separator for separating lubricant and compressed air from each other, a heat exchanger for cooling the lubricant, a controller for adjusting a flow rate of a cooling medium supplied to the heat exchanger and a lubricant flow adjustment device for adjusting a flow rate of lubricant supplied to the heat exchanger at a temperature of the lubricant after its separation from compressed air.
    In another aspect of the invention, an oil-cooled air compressor comprises an oil separator for separating a lubricant and the compressed air from each other, a heat exchanger for cooling the lubricant, a cooling fan for supplying cooling air to the heat exchanger and a controller for adjusting a rotation speed of the cooling fan to bring the lubricant temperature to TO, wherein the oil-cooled air compressor further comprises a lubricant flow adjustment device for adjusting a flow rate of the lubricant supplied to the heat exchanger, so that the lubricant temperature becomes T1, the critical condensed water onset temperature being TD and TO > Tl a TD when TD.
    In the above aspects, it is preferable for the oil-cooled air compressor to include a bypass passage to allow the lubricant, after separation from the compressed air, to bypass the heat exchanger, so that the flow rate of the lubricant supplied to the heat exchanger is adjusted.
    According to the invention, there is provided an oil-cooled air compressor in which the appearance of condensed water is limited independently of an environment in which the air compressor is arranged.
    Other objects, features and advantages of the invention will become apparent from the following description of the embodiments of the invention, taken in conjunction with the accompanying drawings.
    Brief description of the different views of the drawings
    Figure 1 is a schematic view showing an air compressor arranged in a device.
    Fig. 2 is a diagram showing conditions under control.
    Detailed description of the invention
    Embodiments of the invention will be described below with reference to the drawings.
    Figure 1 is a schematic view showing an air compressor arranged in a device. This embodiment relates to an air compressor in which a lubricant for cooling compressed air is cooled by atmospheric air through a heat exchanger.
    A compressor unit 15 of the embodiment as an air compressor in which the lubricant is cooled by atmospheric air is arranged in a compressor part 16 in equipment in a factory or the like. A cooling air for cooling the compressor unit 15 is admitted into the compressor part 16 through an inlet 22 of the compressor part 16. The compressor unit 15 has an inlet port 20 to admit through the inlet port 20 in the compressor unit 15 the cooling air admitted into the compressor part 16 through the inlet port 22.
    The cooling air admitted into the compressor unit 15 is supplied by a cooling fan to a lubricant heat exchanger 6 and is discharged from the compressor unit 15 through an exhaust port 19 of the compressor. unit. In the embodiment, an exhaust duct 17 is connected to the exhaust port 19, so that the cooling air is exhausted by a ventilation fan 18 through the exhaust duct 17 out of the exhaust duct 17. compressor 16.
    In the unity of. compressor 15, the cooling air is taken from the outside of the compressor part 16 in the unit and is discharged after cooling of the inside of the unit. In Fig. 1, an inlet side of the exhaust duct 17 is arranged at a sufficient distance from the exhaust port 19 of the compressor unit 15, although they must be remote from the port evacuation 19 by more than a predetermined distance.
    The compressor unit 15 will be described below. Air to be compressed by the compressor unit 15 is taken through an inlet port 12 through an inlet filter 9 and an inlet valve 8 into a compressor body 1 driven by a motor 2. The air Atmosphere admitted into the compressor body 1 is compressed to have a predetermined pressure, then supplied with lubricant in an oil separator 3. Compressed air separated from the lubricant by the oil separator 3 is supplied to the compressor unit through a non-return valve 4 to use for various cases requiring compressed air.
    On the other hand, the lubricant separated from the air by the oil separator 3 is supplied to the compressor body 1 through a circulation path comprising the heat exchanger 6 for the lubricant and an oil filter. 7. A lubricant flow adjustment device 5 is arranged between the oil separator 3 and the heat exchanger 6 for the lubricant in the circulation path. The lubricant flow adjusting device 5 adjusts a flow rate of a portion of the lubricant separated from another portion thereof supplied to the heat exchanger · 6 for the lubricant and flowing in a lubricant passage. bypass 14 bypassing the heat exchanger 6 for the lubricant.
    Specifically, the lubricant flow control device 5 includes a lubricant temperature sensor for adjusting the flow rate of a portion of the lubricant flowing to the bypass passage 14 and the flow rate of another portion of the lubricant. flowing to the heat exchanger 6 for the lubricant. The manner in which flow rates are determined is described below.
    The control of the lubricant temperature will be described below. A temperature sensor 10 for measuring the lubricant temperature is arranged between the compressor body 1 and the oil separator 3. A controller 12 compares a temperature T measured by the temperature sensor 10 with a target temperature T0. The target temperature T0 is greater than a critical condensed water temperature TD at which the condensed water appears in the compressor (T0> TD). The controller 12 outputs to the cooling fan inverter 11 a drive frequency signal for adjusting a rotational speed of the cooling fan 13, so that the flow of air supplied to the heat exchanger 6 to the lubricant is adjusted to obtain the target temperature T0.
    Concretely, the following control is realized. When a consumed amount of air decreases and a charge ratio decreases, heat energy generated by the compressor body 1 decreases so that a temperature of the air discharged from the compressor body 1 decreases. The temperature decrease of the air discharged from the compressor body 1 is detected by the temperature sensor 10 to decrease the speed of rotation of the cooling fan 13 so that the flow rate of the air supplied to the heat exchanger 6 for the lubricant is decreased to bring the temperature T of the lubricant to a value close to the target temperature T0. By determining the control frequency signal of the cooling fan inverter 11 on the basis of the temperature detected by the temperature sensor 10, a quantity of the heat exchange is adjusted at the level of the heat exchanger 6 for the lubricant to bring the lubricant temperature to a value close to the target temperature T0.
    On the other hand, when the exhaust duct 17 is inappropriately arranged, as shown in the embodiment, the following problem occurs. Namely, even when the flow rate of the air pushed by the cooling fan 13 is adjusted by the inverter 11, the arrangement of the. exhaust duct 17 causes an increase in the flow rate of the cooling air in the compressor unit 15 under the influence of the ventilation fan 18. In such a case, the lubricant temperature becomes no greater than T0 and when the Lubricant temperature reaches the critical TD temperature of condensed water appearance, the condensed water appears.
    Since this phenomenon is caused by the fact that when the cooling fan 13 generates its minimum flow rate, the actual flow rate of the cooling air supplied to the heat exchanger 6 for the lubricant and accelerated by the ventilation fan 18 is greater than the flow rate of the cooling air supplied to the heat exchanger 6 for the lubricant only by the cooling fan 13 without the ventilation fan 18 (refer to FIG. 2), the embodiment has the particularity next.
    Namely, while one. flow rate of a cooling medium supplied to the heat exchanger 6 for the lubricant is continuously adjusted to ensure that the lubricant temperature is not lower than the target temperature, the lubricant flow adjustment device 5 decreases its measurements of the lubricant temperature and lubricant flow rate supplied to the heat exchanger 6 for the lubricant to ensure that the lubricant temperature is not lower than the predetermined temperature T1. > Tl> TD.
    In normal operation, as described above, the flow rate of the cooling medium supplied to the heat exchanger 6 for the lubricant is continuously adjusted to ensure that the lubricant temperature is not lower than TO. In this case, for example, according to the decrease in the load ratio caused by the decrease in the air flow rate used by the air compressor, the flow rate of the cooling medium (the flow rate of the cooling air pushed by the cooling fan 13 in the embodiment) decreases. When the heat energy exchanged by the heat exchanger is excessively large in the specific condition of a problem such as a case in which the flow rate of the cooling medium is minimal, the flow of the lubricant supplied to the heat exchanger Heat 6 for the lubricant is decreased by the lubricant flow rate adjuster 5. Therefore, the heat energy exchanged by the heat exchanger is decreased.
    By reducing the heat energy exchanged, in the oil-cooled air compressor, the energy saving by the inverter control for the cooling fan is obtained and the appearance of condensed water problematic is prevented, even when the exhaust duct is inappropriately arranged.
    Concretely, the. Lubricant flow adjustment device includes the lubricant temperature sensor to easily adjust the lubricant flow rate.
    As a flow adjustment device. lubricant comprising the lubricant temperature sensor, for example, a valve comprising a temperature sensor filled with a feedstock for measuring the temperature is suitable.
    In another embodiment, the temperature sensor such as a thermistor or the like for measuring the temperature of the lubricant can be arranged on the lubricant passage so that the passage of the lubricant supplied to the heat exchanger 6 for the lubricant is decreased to limit further decrease in lubricant temperature when the lubricant temperature measured is low. In this case, the temperature T1 lower than 0 and not lower than TD may be used as the reference value, so that the controller 12 controls the lubricant temperature so that it is not lower than T1.
    The adjustment of the lubricant flow rate to be supplied to the heat exchanger 6 for the lubricant is achieved by the lubricant flow control device 5 and the bypass passage 14. The lubricant flow adjustment device 5 adjusts the flow rate by ensuring that lubricant flow through bypass passage 14 bypasses the heat exchanger according to the temperature measured by the lubricant temperature sensor (the above temperature sensor) to decrease the flow rate lubricant flowing through the heat exchanger 6 for the lubricant. Namely, the amount of heat exchange is limited by the lubricant flow control device 5 to maintain the lubricant temperature not lower than T1.
    When the consumed air flow increases to increase the heat energy generated by the compressor body 1, the lubricant flow control device 5 increases the flow rate of the lubricant flowing through the heat exchanger 6 for the lubricant to maintain the lubricant temperature T to Tl. When the load ratio increases further and the increase in lubricant temperature continues so that · the lubricant temperature becomes TO, regardless of whether the lubricant flow is flowing through the heat exchanger 6 for the lubricant becomes maximum, the flow of air supplied by the cooling fan 13 to the heat exchanger 6 for the lubricant is increased. In this situation, control is performed to bring the lubricant temperature T to TO.
    Although the lubricant flow adjustment device includes the lubricant temperature sensor in the above embodiment, the lubricant temperature sensor can be arranged on the lubricant passage extending from the oil separator 3. In addition, the temperature measured by the temperature sensor 10 can be used to control the lubricant flow control device 5 by the controller 12.
    Fig. 2 is a view showing the control in the embodiment. Even with the load ratio, the lubricant temperature can be maintained at TO by adjusting the rotational speed of the cooling fan 12 with the cooling fan inverter 11 (refer to t0-t1). Since the lubricant temperature can not be maintained at 10 and decreases to less than 10 under the influence of the blower 18 when the load ratio further decreases, the lubricant flow control device 5 decreases the lubricant flow rate. circulating through the heat exchanger 6 for the lubricant (refer to tl). In this situation, the flow rate of the lubricant supplied to the heat exchanger is adjusted to bring the lubricant temperature to T1.
    As is shown in the dashed line in the third diagram of FIG. 2, the excessive flow rate of the cooling air flows over the heat exchanger to bring the lubricant temperature to a value less than TO independently of the the speed of rotation of the cooling fan 13 decreases to bring the flow rate of the cooling air flowing over the heat exchanger to a minimum value, the lubricant flow control device 5 increases the flow rate of the cooling fan. lubricant flowing through the bypass passage 14 so that the flow rate of the lubricant flowing through the heat exchanger 6 for the lubricant is decreased to decrease the heat energy exchanged (refer to tl-t2) .
    As the lubricant temperature rises again as the load ratio increases, the lubricant flow control device increases the flow rate of the lubricant flowing through the heat exchanger 6 for the lubricant and the flow rate adjustment device. Lubricant brings the flow rate of the lubricant flowing through the heat exchanger to 100% when the lubricant temperature becomes TO and controls the rotation speed of the cooling fan to maintain the lubricant temperature at TO (refer to t2 - t3 and at the time after t3).
    As described above, by adjusting the flow rate of the lubricant supplied to the heat exchanger 6 for the lubricant, the lubricant temperature is maintained stable to prevent the problem such as the appearance of condensed water or the like, so that the compressor unit operates stably regardless of the environment in which the compressor is arranged.
    Those skilled in the art will further understand that although the foregoing description has been made of embodiments of the invention, the invention is not limited thereto and various changes and modifications may be made without reference to the invention. depart from the spirit of the invention and the scope of the appended claims.
    权利要求:
    Claims (6)
    [1]
    An oil-cooled air compressor comprising a heat exchanger for a lubricant and a compressor body compressing air, wherein a flow rate of a cooling medium supplied to the heat exchanger is adjusted to continuously to ensure that a lubricant temperature is not lower than a control temperature TO, the compressor further comprising a lubricant flow control device for measuring the lubricant temperature and reducing the flow rate of the lubricant supplied to the lubricant. the heat exchanger, so that the lubricant temperature does not become lower than T1 and TO> T1> TD, TD being a critical condensed water onset temperature at which condensed water appears in the body of compressor.
    [2]
    An oil-cooled air compressor according to claim 1, wherein the cooling medium is atmospheric air.
    [3]
    3. Oil Cooled Air Compressor comprising an oil separator for separating a lubricant and compressed air from each other, a heat exchanger for cooling the lubricant, a controller for adjusting a flow rate a cooling medium supplied to the heat exchanger and a lubricant flow adjusting device for adjusting a flow rate of the lubricant supplied to the heat exchanger at a temperature of the lubricant after separation from the compressed air.
    [4]
    An oil-cooled air compressor according to claim 3, further comprising a bypass passage for allowing the lubricant, after separation of the compressed air, to bypass the heat exchanger so that the lubricant flow rate supplied to the heat exchanger is adjusted.
    [5]
    5. Oil cooled air compressor, comprising an oil separator for separating a lubricant and the compressed air from each other, a heat exchanger for cooling the lubricant, a cooling fan to provide a cooling air to the heat exchanger and a controller for adjusting a rotation speed of the cooling fan to bring the lubricant temperature to TO, wherein the oil-cooled air compressor further comprises a cooling device; adjusting the lubricant flow rate to adjust a flow rate of the supplied lubricant to the heat exchanger, so that the lubricant temperature becomes T1, the condensed water onset critical temperature being TD and T0> T1 TD when TD.
    [6]
    An oil-cooled air compressor according to claim 5, further comprising a bypass passage for allowing the lubricant, after separation from the compressed air, to bypass the heat exchanger so that the flow rate of the Lubricant supplied to the heat exchanger is adjusted.
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP2007253022|2007-09-28|
    JP2007253022A|JP5268317B2|2007-09-28|2007-09-28|Oil-cooled air compressor|
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