JP2006349262A - Hydraulic fluid cooling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic fluid cooling device that prevents a rubber hose forming a hydraulic fluid circulation circuit from being degraded or damaged by the heat of a hydraulic fluid. <P>SOLUTION: Even if the hydraulic fluid circulation circuit 10 is almost closed and the hydraulic fluid circulates between a relief valve 14 and a circulating pump 12 and makes it impossible to let a quantity of heat escape from the circulating pump 12 to the hydraulic fluid, a temperature sensor 16 detects the temperature of the hydraulic fluid circulating between the relief valve 14 and the circulating pump 12 and a controller 15 stops the operation of the circulating pump 12 according to the output of the temperature sensor 16. Thus before the rubber hose forming the hydraulic fluid circulation circuit 10 is degraded or damaged by the heat of the hydraulic fluid received from the circulating pump 12, the operation of the circulating pump 12 is stopped to prevent degradation or damage of the rubber hose. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hydraulic fluid cooling device that cools low-pressure hydraulic fluid used in equipment such as a machine tool using a refrigeration circuit, for example.

  Conventionally, as a hydraulic fluid cooling device, there is one provided with a hydraulic fluid circulation circuit and a refrigeration circuit (see JP 2001-165058 A).

  In the hydraulic fluid circulation circuit, the hydraulic fluid of the equipment is circulated by a circulation pump driven by a motor. The said hydraulic fluid circulation circuit consists of rubber hoses, for example.

  The refrigeration circuit includes a compressor that compresses the gas refrigerant, a condenser that condenses the gas refrigerant, a decompression mechanism that decompresses the liquid refrigerant, and the hydraulic fluid circulation circuit on the discharge side of the circulation pump by heat exchange with the refrigerant. The evaporator for cooling the hydraulic fluid is connected in order.

  When the hydraulic fluid circulation circuit is closed by closing a valve provided in the middle of the hydraulic fluid circulation circuit, an excessive load is not applied to the motor of the circulation pump, or the hydraulic fluid circulation circuit In order to avoid excessive pressure, a relief valve is usually provided.

This relief valve is provided, for example, in a bypass circuit that bypasses from the discharge side of the circulation pump to the suction side of the circulation pump.
JP 2001-165058 A

  However, in the conventional hydraulic fluid cooling device, the hydraulic fluid circulation circuit is substantially closed, and the hydraulic fluid circulates between the relief valve and the circulation pump, thereby releasing the amount of heat from the circulation pump to the hydraulic fluid. If it becomes impossible, since the hydraulic fluid circulation circuit is a rubber hose having a low heat resistance temperature, it is deteriorated or broken by the heat of the hydraulic fluid.

  Therefore, an object of the present invention is to provide a hydraulic fluid cooling device that prevents the rubber hose constituting the hydraulic fluid circulation circuit from being deteriorated or damaged by the heat of the hydraulic fluid.

In order to solve the above problems, the hydraulic fluid cooling device of the present invention is:
A hydraulic fluid circuit that circulates the hydraulic fluid of the device by a circulation pump driven by a motor and includes a non-metallic pipe at least in part;
A compressor, a condenser, a decompression mechanism, and a refrigeration circuit in which an evaporator for cooling the working fluid in the working fluid circulation circuit on the discharge side of the circulation pump by heat exchange with the refrigerant is sequentially connected. In the hydraulic fluid cooling device,
A relief valve is provided in a bypass circuit that bypasses the hydraulic fluid circulation circuit between the circulation pump and the evaporator to the hydraulic fluid circulation circuit on the suction side of the circulation pump, and circulates between the relief valve and the circulation pump. A temperature sensor for detecting the temperature of the working fluid is provided, and a control device for stopping the operation of the circulating pump based on the output of the temperature sensor is provided.

  Here, in this specification, the working fluid refers to, for example, a cooling fluid, a lubricating fluid, or a cutting fluid, and the working fluid is oil, water, flammable liquid, or the like. A non-metallic pipe means a pipe | tube with low heat-resistant temperature, such as a rubber hose and a vinyl hose, for example.

  According to the hydraulic fluid cooling device of the present invention, the hydraulic fluid circulation circuit is substantially closed, and the hydraulic fluid circulates between the relief valve and the circulation pump, thereby releasing the amount of heat from the circulation pump to the hydraulic fluid. Even if it becomes impossible, the temperature of the hydraulic fluid circulating between the relief valve and the circulation pump is detected by the temperature sensor, and the operation of the circulation pump is performed by the control device based on the output of the temperature sensor. Stop. As described above, before the non-metallic pipe constituting at least a part of the hydraulic fluid circulation circuit is deteriorated or broken by the heat of the hydraulic fluid received from the circulation pump, the operation of the circulation pump is stopped to Deterioration or breakage of the metal tube can be prevented.

  In one embodiment, the temperature sensor directly detects the temperature of the hydraulic fluid inside the hydraulic fluid circulation circuit or the bypass circuit.

  According to the hydraulic fluid cooling device of this embodiment, since the temperature sensor directly detects the temperature of the hydraulic fluid inside the hydraulic fluid circulation circuit or the bypass circuit, the temperature rise of the hydraulic fluid can be detected quickly. .

  In one embodiment, the temperature sensor indirectly detects the temperature of the hydraulic fluid via the outer wall of the hydraulic fluid circulation circuit or the bypass circuit.

  According to the hydraulic fluid cooling device of this embodiment, the temperature sensor indirectly detects the temperature of the hydraulic fluid via the outer wall of the hydraulic fluid circulation circuit or the bypass circuit. It becomes easy.

The hydraulic fluid cooling device of the present invention is
A hydraulic fluid circuit that circulates the hydraulic fluid of the device by a circulation pump driven by a motor and includes a non-metallic pipe at least in part;
A compressor, a condenser, a decompression mechanism, and a refrigeration circuit in which an evaporator for cooling the working fluid in the working fluid circulation circuit on the discharge side of the circulation pump by heat exchange with the refrigerant is sequentially connected. In the hydraulic fluid cooling device,
A relief fluid is provided in a bypass circuit that is bypassed from the hydraulic fluid circulation circuit between the circulation pump and the evaporator to the hydraulic fluid circulation circuit on the suction side of the circulation pump, and the hydraulic fluid circulates through the hydraulic fluid circulation circuit The flow rate sensor which detects this flow rate is provided, and the control apparatus which stops the operation | movement of the said circulation pump based on the output of this flow rate sensor is provided.

  According to the hydraulic fluid cooling device of the present invention, the hydraulic fluid circulation circuit is substantially closed, the flow rate of the hydraulic fluid circulating through the hydraulic fluid circulation circuit is reduced, and the cooling efficiency of the hydraulic fluid by the evaporator is deteriorated. In addition, the flow rate of the hydraulic fluid circulating in the hydraulic fluid circulation circuit is detected by the flow rate sensor, and the operation of the circulation pump is stopped by the control device based on the output of the flow rate sensor. Thus, before the non-metallic pipe constituting at least a part of the hydraulic fluid circulation circuit deteriorates or breaks due to the heat of the hydraulic fluid, the circulation pump is stopped and the non-metallic pipe deteriorates or breaks. Can be prevented.

  In the hydraulic fluid cooling device of one embodiment, the flow rate sensor is provided on the downstream side of the connection portion with the bypass circuit in the hydraulic fluid circulation circuit on the discharge side of the circulation pump.

  According to the hydraulic fluid cooling device of this embodiment, the flow rate sensor is provided on the downstream side of the connection portion with the bypass circuit in the hydraulic fluid circulation circuit on the discharge side of the circulation pump. Without detecting the flow rate of the hydraulic fluid flowing through the circuit, the flow rate of the hydraulic fluid flowing through the evaporator can be reliably detected. Thus, the deterioration or breakage of the non-metallic tube due to the heat of the hydraulic fluid can be reliably prevented.

The hydraulic fluid cooling device of the present invention is
A hydraulic fluid circuit that circulates the hydraulic fluid of the device by a circulation pump driven by a motor and includes a non-metallic pipe at least in part;
A compressor, a condenser, a decompression mechanism, and a refrigeration circuit in which an evaporator for cooling the working fluid in the working fluid circulation circuit on the discharge side of the circulation pump by heat exchange with the refrigerant is sequentially connected. In the hydraulic fluid cooling device,
A relief valve is provided in a bypass circuit that is bypassed from the hydraulic fluid circulation circuit between the circulation pump and the evaporator to the hydraulic fluid circulation circuit on the suction side of the circulation pump, and the hydraulic fluid discharged from the circulation pump A pressure sensor for detecting pressure is provided, and a control device for stopping the operation of the circulating pump based on the output of the pressure sensor is provided.

  According to the hydraulic fluid cooling device of the present invention, the hydraulic fluid circulation circuit is substantially closed, and the hydraulic fluid discharged from the circulation pump is less likely to flow smoothly through the evaporator. However, the pressure of the hydraulic fluid discharged from the circulation pump is detected by the pressure sensor, and the operation of the circulation pump is stopped by the control device based on the output of the pressure sensor. Thus, before the non-metallic pipe constituting at least a part of the hydraulic fluid circulation circuit deteriorates or breaks due to the heat of the hydraulic fluid, the circulation pump is stopped and the non-metallic pipe deteriorates or breaks. Can be prevented.

  In one embodiment, the pressure sensor is provided in the bypass circuit upstream of the relief valve.

  According to the hydraulic fluid cooling device of this embodiment, since the pressure sensor is provided in the bypass circuit upstream of the relief valve, the discharge pressure of the circulation pump can be reliably detected.

  In one embodiment, the bypass circuit is a pipe connecting the discharge side of the circulation pump and the suction side of the circulation pump, and the relief valve is provided in the middle of the pipe. ing.

  According to the hydraulic fluid cooling device of this embodiment, the bypass circuit is a pipe connecting the discharge side of the circulation pump and the suction side of the circulation pump, and the relief valve is provided in the middle of the pipe. Therefore, the hydraulic fluid cooling device can be reduced in size. Further, since the bypass circuit is tankless, the hydraulic fluid circulates between the relief valve and the circulation pump, so that heat tends to accumulate from the circulation pump to the hydraulic fluid. Since the operation of the circulating pump can be stopped before the non-metallic pipe deteriorates or breaks due to the heat of the hydraulic fluid, the non-metallic pipe can be effectively prevented from being deteriorated or broken.

The hydraulic fluid cooling device of the present invention is
A hydraulic fluid circuit that circulates the hydraulic fluid of the device by a circulation pump driven by a motor and includes a non-metallic pipe at least in part;
A compressor, a condenser, a decompression mechanism, and a refrigeration circuit in which an evaporator for cooling the working fluid in the working fluid circulation circuit on the discharge side of the circulation pump by heat exchange with the refrigerant is sequentially connected. In the hydraulic fluid cooling device,
A relief valve is provided in a bypass circuit that bypasses the hydraulic fluid circuit on the downstream side of the evaporator to the hydraulic fluid circuit on the suction side of the circulation pump, and the hydraulic fluid circulates between the relief valve and the circulation pump. A temperature sensor for detecting the temperature of the circulating pump is provided, and a control device for stopping the operation of the circulating pump based on the output of the temperature sensor is provided.

  According to the hydraulic fluid cooling device of the present invention, the hydraulic fluid circulation circuit is substantially closed, the hydraulic fluid circulates between the relief valve and the circulation pump, and with respect to the amount of heat from the circulation pump to the hydraulic fluid. Even if the cooling by the evaporator cannot catch up, the temperature of the working fluid circulating between the relief valve and the circulation pump is detected by the temperature sensor, and the controller controls the temperature based on the output of the temperature sensor. Stop operation of the circulating pump. As described above, before the non-metallic pipe constituting at least a part of the hydraulic fluid circulation circuit is deteriorated or broken by the heat of the hydraulic fluid received from the circulation pump, the operation of the circulation pump is stopped to Deterioration or breakage of the metal tube can be prevented.

  In one embodiment, the temperature sensor directly detects the temperature of the hydraulic fluid inside the hydraulic fluid circulation circuit or the bypass circuit.

  According to the hydraulic fluid cooling device of this embodiment, since the temperature sensor directly detects the temperature of the hydraulic fluid inside the hydraulic fluid circulation circuit or the bypass circuit, the temperature rise of the hydraulic fluid can be detected quickly. .

  In one embodiment, the temperature sensor indirectly detects the temperature of the hydraulic fluid via the outer wall of the hydraulic fluid circulation circuit or the bypass circuit.

  According to the hydraulic fluid cooling device of this embodiment, the temperature sensor indirectly detects the temperature of the hydraulic fluid via the outer wall of the hydraulic fluid circulation circuit or the bypass circuit. It becomes easy.

The hydraulic fluid cooling device of the present invention is
A hydraulic fluid circuit that circulates the hydraulic fluid of the device by a circulation pump driven by a motor and includes a non-metallic pipe at least in part;
A compressor, a condenser, a decompression mechanism, and a refrigeration circuit in which an evaporator for cooling the working fluid in the working fluid circulation circuit on the discharge side of the circulation pump by heat exchange with the refrigerant is sequentially connected. In the hydraulic fluid cooling device,
A relief valve is provided in a bypass circuit that bypasses from the hydraulic fluid circulation circuit downstream of the evaporator to the hydraulic fluid circulation circuit on the suction side of the circulation pump, and detects the flow rate of the hydraulic fluid circulating through the hydraulic fluid circulation circuit. And a control device for stopping the operation of the circulating pump based on the output of the flow sensor.

  According to the hydraulic fluid cooling device of the present invention, the hydraulic fluid circulation circuit is substantially closed, the flow rate of the hydraulic fluid circulating through the hydraulic fluid circulation circuit is reduced, and the cooling efficiency of the hydraulic fluid by the evaporator is deteriorated. In addition, the flow rate of the hydraulic fluid circulating in the hydraulic fluid circulation circuit is detected by the flow rate sensor, and the operation of the circulation pump is stopped by the control device based on the output of the flow rate sensor. Thus, before the non-metallic pipe constituting at least a part of the hydraulic fluid circulation circuit deteriorates or breaks due to the heat of the hydraulic fluid, the circulation pump is stopped and the non-metallic pipe deteriorates or breaks. Can be prevented.

  In the hydraulic fluid cooling device of one embodiment, the flow rate sensor is provided on the upstream side of the connection portion with the bypass circuit in the hydraulic fluid circulation circuit on the discharge side of the circulation pump.

  According to the hydraulic fluid cooling device of this embodiment, the flow rate sensor is provided upstream of the connection with the bypass circuit in the hydraulic fluid circulation circuit on the discharge side of the circulation pump. The flow rate of the working fluid flowing through the vessel can be reliably detected. Thus, the deterioration or breakage of the non-metallic tube due to the heat of the hydraulic fluid can be reliably prevented.

The hydraulic fluid cooling device of the present invention is
A hydraulic fluid circuit that circulates the hydraulic fluid of the device by a circulation pump driven by a motor and includes a non-metallic pipe at least in part;
A compressor, a condenser, a decompression mechanism, and a refrigeration circuit in which an evaporator for cooling the working fluid in the working fluid circulation circuit on the discharge side of the circulation pump by heat exchange with the refrigerant is sequentially connected. In the hydraulic fluid cooling device,
A relief valve is provided in a bypass circuit that bypasses the hydraulic fluid circulation circuit downstream of the evaporator from the hydraulic fluid circulation circuit on the suction side of the circulation pump, and detects the pressure of the hydraulic fluid discharged from the circulation pump. A pressure sensor is provided, and a control device for stopping the operation of the circulating pump based on the output of the pressure sensor is provided.

  According to the hydraulic fluid cooling device of the present invention, the hydraulic fluid circulation circuit is substantially closed, and the hydraulic fluid discharged from the circulation pump is less likely to flow smoothly through the evaporator. However, the pressure of the hydraulic fluid discharged from the circulation pump is detected by the pressure sensor, and the operation of the circulation pump is stopped by the control device based on the output of the pressure sensor. Thus, before the non-metallic pipe constituting at least a part of the hydraulic fluid circulation circuit deteriorates or breaks due to the heat of the hydraulic fluid, the circulation pump is stopped and the non-metallic pipe deteriorates or breaks. Can be prevented.

  In one embodiment, the pressure sensor is provided in the bypass circuit upstream of the relief valve.

  According to the hydraulic fluid cooling device of this embodiment, since the pressure sensor is provided in the bypass circuit upstream of the relief valve, the discharge pressure of the circulation pump can be reliably detected.

  In one embodiment, the bypass circuit is a pipe connecting the downstream side of the evaporator and the suction side of the circulation pump, and the relief valve is provided in the middle of the pipe. ing.

  According to the hydraulic fluid cooling device of this embodiment, the bypass circuit is a pipe connecting the downstream side of the evaporator and the suction side of the circulation pump, and the relief valve is provided in the middle of the pipe. Therefore, the hydraulic fluid cooling device can be reduced in size. Further, since the bypass circuit is tankless, the hydraulic fluid circulates between the relief valve and the circulation pump, so that heat tends to accumulate from the circulation pump to the hydraulic fluid. Since the operation of the circulating pump can be stopped before the non-metallic pipe deteriorates or breaks due to the heat of the hydraulic fluid, the non-metallic pipe can be effectively prevented from being deteriorated or broken.

  According to the hydraulic fluid cooling device of the present invention, the temperature, flow rate or pressure of the hydraulic fluid is detected, and the operation of the circulation pump is stopped based on this detection. The deterioration of or breakage of the non-metallic pipe can be prevented by stopping the operation of the circulation pump before it is deteriorated or broken by the above.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

(First embodiment)
FIG. 1 is a longitudinal sectional view showing an embodiment of the hydraulic fluid cooling device of the present invention. The hydraulic fluid cooling device 1 includes a hydraulic fluid circulation circuit 10 that circulates the hydraulic fluid of the device 3 and a refrigeration circuit 20 that cools the hydraulic fluid in the hydraulic fluid circulation circuit 10.

  The device 3 is a device that performs predetermined machining on a workpiece, and is, for example, a machine tool including a machining center. A hydraulic fluid passage (not shown) through which hydraulic fluid flows is formed inside the device 3, and the hydraulic fluid absorbs a heat load generated by machining or the like. That is, the hydraulic fluid serves as a cooling fluid. This hydraulic fluid is oil, water or flammable liquid.

  An upstream end of the hydraulic fluid passage in the device 3 is connected to an outlet port 1b of the hydraulic fluid cooling device 1 which is a downstream end of the hydraulic fluid circulation circuit 10 via a first pipe 5a. A downstream end of the hydraulic fluid passage in the device 3 is connected to a tank 4 that stores hydraulic fluid via a second pipe 5b. The tank 4 is connected to an inlet port 1a of the hydraulic fluid cooling device 1 that is an upstream end of the hydraulic fluid circulation circuit 10 via a third pipe 5c.

  The hydraulic fluid circulation circuit 10 is provided with a circulation pump 12 that is rotationally driven by a motor 11 to forcibly circulate the hydraulic fluid. Then, the hydraulic fluid that has returned from the hydraulic fluid passage in the device 3 to the tank 4 through the second pipe 5 b is sucked by the circulation pump 12, and is then drawn from the tank 4 to the third pipe. The hydraulic fluid is caused to flow into the hydraulic fluid circulation circuit 10 via 5c and the hydraulic fluid discharged from the circulation pump 12 is supplied again to the hydraulic fluid passage in the device 3 via the first pipe 5a. Cycle as you do.

  The refrigeration circuit 20 includes a compressor 21, a condenser 22, a decompression mechanism 23, and an evaporator 24 connected in order. The compressor 21 compresses the gas refrigerant. The condenser 22 cools the gas refrigerant discharged from the compressor 21 to condense and liquefy it.

  The decompression mechanism 23 is an electronic expansion valve, and decompresses the liquid refrigerant from the condenser 22. The decompression mechanism 23 may be a capillary tube.

  The evaporator 24 evaporates the liquid refrigerant decompressed by the decompression mechanism 23. The evaporator 24 cools the working fluid in the working fluid circulation circuit 10 on the discharge side of the circulation pump 12 by exchanging heat with the refrigerant.

  An accumulator 27 is provided on the upstream side of the compressor 21 to separate the gas and liquid in the refrigerant returning from the evaporator 24 to the compressor 21. The condenser 22 is provided with a fan 25 that is driven by a fan motor 26 and blows air to the condenser 22.

  A bypass circuit 13 is provided for bypassing from the hydraulic fluid circulation circuit 10 between the circulation pump 12 and the evaporator 24 to the hydraulic fluid circulation circuit 10 on the suction side of the circulation pump 12. The bypass circuit 13 is a pipe connecting the discharge side of the circulation pump 12 and the suction side of the circulation pump 12.

  A relief valve 14 is provided in the middle of this piping. The relief valve 14 returns a slight amount of hydraulic fluid corresponding to the discharge pressure of the circulation pump 12 to the suction side of the circulation pump 12.

  The hydraulic fluid circulation circuit 10 includes a non-metallic tube 10a at least partially. Specifically, the non-metallic pipe 10a is provided on the downstream side of the connection portion with the bypass circuit 13 in the hydraulic fluid circulation circuit 10 on the discharge side of the circulation pump 12, and the suction of the circulation pump 12 It is provided on the upstream side of the connection portion with the bypass circuit 13 in the hydraulic fluid circulation circuit 10 on the side.

  The non-metallic pipe 10a is a pipe having a low heat resistance temperature such as a rubber hose or a vinyl hose. Specifically, the inner layer is made of nitrile rubber (NBR) having excellent oil resistance and chloroprene having excellent weather resistance. There are a hybrid type hose having an outer layer made of rubber (CR) and a sandwich type hose in which a reinforcing fiber such as nylon is inserted between the inner layer of NBR and the outer layer of CR.

  A temperature sensor 16 is provided for detecting the temperature of the working fluid circulating between the relief valve 14 and the circulation pump 12. That is, the temperature sensor 16 is connected to the connection portion and the non-metallic pipe 10a on the upstream side (or even on the downstream side) of the connection portion with the bypass circuit 13 in the hydraulic fluid circulation circuit 10 on the discharge side of the circulation pump 12. Between). The temperature sensor 16 is, for example, a thermistor.

  The temperature sensor 16 directly detects the temperature of the working fluid inside the working fluid circulation circuit 10. At this time, a part of the hydraulic fluid circulation circuit 10 to which the temperature sensor 16 is attached is a steel pipe, and the temperature sensor 16 is screwed into the steel pipe. Thus, since the temperature sensor 16 directly detects the temperature of the working fluid inside the working fluid circulation circuit 10, it is possible to quickly detect the temperature rise of the working fluid.

  The temperature sensor 16 may indirectly detect the temperature of the hydraulic fluid via the outer wall of the hydraulic fluid circulation circuit 10. At this time, installation of the temperature sensor 16 is facilitated. The temperature sensor 16 may be provided in the bypass circuit 13, or the temperature sensor 16 may be provided directly in the circulation pump 12.

  The hydraulic fluid cooling device 1 is provided with a control device 15 that stops the operation of the circulation pump 12 based on the output of the temperature sensor 16.

  The output value of the temperature sensor 16 is set to a temperature at which the material properties of the non-metallic pipe 10a begin to deteriorate, and the control device 15 stops the operation of the circulation pump 12 at the deterioration temperature or higher. The deterioration temperature is about 60 ° C. to 70 ° C. when the non-metallic tube 10a is a rubber hose.

  The output value of the temperature sensor 16 may be set to a temperature at which the nonmetallic pipe 10a starts to break. This breaking temperature is about 160 ° C. when the nonmetallic pipe 10a is a rubber hose. is there.

  Alternatively, the output value of the temperature sensor 16 may be set to a temperature at which the hydraulic fluid starts to ignite. This ignition temperature is about 100 ° C. to 300 ° C. when the hydraulic fluid is oil. .

  According to the hydraulic fluid cooling device having the above-described configuration, the hydraulic fluid circulation circuit 10 is substantially closed, and the hydraulic fluid circulates between the relief valve 14 and the circulation pump 12, and the circulation pump 12 supplies the hydraulic fluid to the hydraulic fluid. Even if the amount of heat cannot be released, the temperature of the working fluid circulating between the relief valve 14 and the circulation pump 12 is detected by the temperature sensor 16, and the control device is based on the output of the temperature sensor 16. At 15, the operation of the circulating pump 12 is stopped.

  As described above, the operation of the circulation pump 12 is stopped before the non-metallic pipe 10a constituting at least a part of the hydraulic fluid circulation circuit 10 is deteriorated or broken by the heat of the hydraulic fluid received from the circulation pump 12. Thus, deterioration or breakage of the non-metallic pipe 10a can be prevented.

  The bypass circuit 13 is a pipe connecting the discharge side of the circulation pump 12 and the suction side of the circulation pump 12, and the relief valve 14 is provided in the middle of the pipe (that is, Since it is a pump relief), the hydraulic fluid cooling device 1 can be downsized.

  In addition, since the bypass circuit 13 is tankless, heat is easily accumulated from the circulation pump 12 to the working fluid by circulating the working fluid between the relief valve 14 and the circulation pump 12. Since the operation of the circulation pump can be stopped before the non-metallic pipe 10a of the hydraulic fluid circulation circuit 10 is deteriorated or damaged by the heat of the hydraulic fluid, the deterioration or damage of the non-metallic pipe 10a can be effectively prevented.

(Second Embodiment)
FIG. 2 shows a second embodiment of the hydraulic fluid cooling device of the present invention. The difference from the first embodiment will be described. In the second embodiment, the flow rate of the working fluid that circulates in the working fluid circulation circuit 10 in place of the temperature sensor 16 of the first embodiment. Is provided. That is, the flow rate sensor 17 is provided on the downstream side of the connection portion with the bypass circuit 13 in the hydraulic fluid circulation circuit 10 on the discharge side of the circulation pump 12.

  The control device 15 stops the operation of the circulation pump 12 based on the output of the flow rate sensor 17.

  The output value of the flow rate sensor 17 is a flow rate value at which the working fluid in the working fluid circulation circuit 10 is sufficiently cooled by the evaporator 24 and the non-metallic pipe 10a is not deteriorated or damaged by the heat of the working fluid. The control device 15 stops the operation of the circulation pump 12 below this flow rate value. This flow rate value is, for example, 1 liter / minute.

  According to the hydraulic fluid cooling device having the above configuration, the hydraulic fluid circulation circuit 10 is substantially closed, the flow rate of the hydraulic fluid circulating through the hydraulic fluid circulation circuit 10 is reduced, and the cooling efficiency of the hydraulic fluid by the evaporator 24 is reduced. Even if it becomes worse, the flow rate of the hydraulic fluid circulating in the hydraulic fluid circulation circuit 10 is detected by the flow rate sensor 17, and the control device 15 operates the circulation pump 12 based on the output of the flow rate sensor 17. Stop.

  Thus, before the non-metallic pipe 10a constituting at least a part of the hydraulic fluid circulation circuit 10 is deteriorated or damaged by the heat of the hydraulic fluid, the operation of the circulating pump 12 is stopped and the non-metallic pipe 10a is stopped. Can be prevented from being degraded or damaged.

  Further, since the flow rate sensor 17 is provided on the downstream side of the connection portion with the bypass circuit 13 in the hydraulic fluid circulation circuit 10 on the discharge side of the circulation pump 12, the hydraulic fluid flowing through the bypass circuit 13 is provided. Therefore, the flow rate of the working fluid flowing through the evaporator 24 can be reliably detected. Thus, the deterioration or breakage of the non-metallic tube 10a due to the heat of the hydraulic fluid can be reliably prevented.

(Third embodiment)
FIG. 3 shows a third embodiment of the hydraulic fluid cooling device of the present invention. The difference from the first embodiment will be described. In the third embodiment, instead of the temperature sensor 16 of the first embodiment, the pressure of the hydraulic fluid discharged from the circulation pump 12 is changed. A pressure sensor 18 for detection is provided. That is, the pressure sensor 18 is provided in the bypass circuit 13 on the upstream side of the relief valve 14.

  The control device 15 stops the operation of the circulation pump 12 based on the output of the pressure sensor 18.

  The output value of the pressure sensor 18 is set to a pressure value at which the working fluid in the working fluid circulation circuit 10 is uniformly cooled by the evaporator 24 and the non-metallic pipe 10a is not deteriorated or damaged by the heat of the working fluid. Then, the control device 15 stops the operation of the circulation pump 12 when the pressure value is equal to or higher than this pressure value.

  According to the hydraulic fluid cooling device having the above configuration, the hydraulic fluid circulation circuit 10 is substantially closed, and the hydraulic fluid discharged from the circulation pump 12 is less likely to flow smoothly through the evaporator 24. Even if the cooling efficiency of the liquid deteriorates, the pressure of the hydraulic fluid discharged from the circulation pump 12 is detected by the pressure sensor 18, and the control device 15 detects the pressure of the circulation pump based on the output of the pressure sensor 18. 12 operation is stopped.

  Thus, before the non-metallic pipe 10a constituting at least a part of the hydraulic fluid circulation circuit 10 is deteriorated or damaged by the heat of the hydraulic fluid, the operation of the circulating pump 12 is stopped and the non-metallic pipe 10a is stopped. Can be prevented from being deteriorated or damaged.

  Further, since the pressure sensor 18 is provided in the bypass circuit 13 on the upstream side of the relief valve 14, the discharge pressure of the circulation pump 12 can be reliably detected.

(Fourth embodiment)
FIG. 4 shows a fourth embodiment of the hydraulic fluid cooling device of the present invention. The difference from the first embodiment will be described. In the fourth embodiment, the configuration of the bypass circuit 13 is different.

  The bypass circuit 13 of the fourth embodiment is provided with a tank 19 for storing hydraulic fluid downstream of the relief valve 14. Thus, since the tank 19 is provided, the hydraulic fluid discharged from the relief valve 14 can be cooled by the tank 19, and deterioration or breakage of the non-metallic pipe 10a can be prevented.

(Fifth embodiment)
FIG. 5 shows a fifth embodiment of the hydraulic fluid cooling device of the present invention. When the points different from the first embodiment are described, the configurations of the refrigeration circuit 20 and the bypass circuit 13 are different in the fifth embodiment. Since other structures are the same as those of the first embodiment, description thereof is omitted.

  In the fifth embodiment, the refrigeration circuit 20 is provided with two evaporators 24 in parallel. The hydraulic fluid circulation circuit 10 is connected to the two evaporators 24 in series.

  The bypass circuit 13 bypasses from the hydraulic fluid circulation circuit 20 on the downstream side of the evaporator 24 to the hydraulic fluid circulation circuit 10 on the suction side of the circulation pump 12. A relief valve 14 is provided in the bypass circuit 13. The bypass circuit 13 includes non-metallic pipes 13 a on the upstream side and the downstream side of the relief valve 14. This non-metallic tube 13 a is the same as the non-metallic tube 10 a of the hydraulic fluid circulation circuit 10.

  A temperature sensor 16 for detecting the temperature of the hydraulic fluid circulating between the relief valve 14 and the circulation pump 12 is provided, and a control device 15 for stopping the operation of the circulation pump 12 based on the output of the temperature sensor 16 is provided. ing. Since the output value of the temperature sensor 16 is the same as that of the first embodiment, description thereof is omitted.

  According to the hydraulic fluid cooling device having the above-described configuration, the hydraulic fluid circulation circuit 10 is substantially closed, and the hydraulic fluid circulates between the relief valve 14 and the circulation pump 12, and the circulation pump 12 supplies the hydraulic fluid to the hydraulic fluid. Even if the cooling by the evaporator 24 cannot catch up with the amount of heat, the temperature of the hydraulic fluid circulating between the relief valve 14 and the circulation pump 12 is detected by the temperature sensor 16. Based on the output, the control device 15 stops the operation of the circulating pump 12.

  Thus, before the non-metallic pipe 10a of the hydraulic fluid circulation circuit 10 and the non-metallic pipe 13a of the bypass circuit 13 are deteriorated or damaged by the heat of the hydraulic fluid received from the circulation pump 12, The operation of the circulation pump 12 can be stopped to prevent the non-metallic pipes 10a and 13a from being deteriorated or damaged.

  Further, when the temperature sensor 16 directly detects the temperature of the hydraulic fluid inside the hydraulic fluid circulation circuit 10 or the bypass circuit 13, an increase in the temperature of the hydraulic fluid can be detected quickly. Further, when the temperature sensor 16 indirectly detects the temperature of the hydraulic fluid through the outer wall of the hydraulic fluid circulation circuit 10 or the bypass circuit 13, the temperature sensor 16 can be easily installed. .

  The bypass circuit 13 is a pipe connecting the downstream side of the evaporator 24 and the suction side of the circulation pump 12, and the relief valve 14 is provided in the middle of the pipe (that is, Since it is a system relief), the hydraulic fluid cooling device 1 can be reduced in size.

  In addition, since the bypass circuit 13 is tankless, heat is easily accumulated from the circulation pump 12 to the working fluid by circulating the working fluid between the relief valve 14 and the circulation pump 12. Since the operation of the circulation pump 12 can be stopped before the non-metallic pipes 10a and 13a are deteriorated or broken by the heat of the working fluid, the non-metallic pipes 10a and 13a can be effectively prevented from being deteriorated or broken.

(Sixth embodiment)
The sixth embodiment of the hydraulic fluid cooling device of the present invention will be described. Instead of the temperature sensor 16 of the fifth embodiment, the hydraulic fluid circulation circuit 10 is replaced by a two-dot chain line in FIG. A flow rate sensor 17 is provided for detecting the flow rate of the working fluid circulating through the fluid. That is, the flow rate sensor 17 is provided on the upstream side of the connection portion with the bypass circuit 13 in the hydraulic fluid circulation circuit 10 on the discharge side of the circulation pump 12.

  The control device 15 stops the operation of the circulation pump 12 based on the output of the flow rate sensor 17. The output value of the flow rate sensor 17 is the same as that of the second embodiment, and the description thereof is omitted.

  According to the hydraulic fluid cooling device having the above configuration, the hydraulic fluid circulation circuit 10 is substantially closed, the flow rate of the hydraulic fluid circulating through the hydraulic fluid circulation circuit 10 is reduced, and the cooling efficiency of the hydraulic fluid by the evaporator 24 is reduced. Even if it becomes worse, the flow rate of the hydraulic fluid circulating in the hydraulic fluid circulation circuit 10 is detected by the flow rate sensor 17, and the control device 15 operates the circulation pump 12 based on the output of the flow rate sensor 17. Stop.

  Thus, before the non-metallic pipe 10a of the hydraulic fluid circulation circuit 10 and the non-metallic pipe 13a of the bypass circuit 13 are deteriorated or damaged by the heat of the hydraulic fluid, the circulation pump 12 is operated. Stopping can prevent the non-metallic pipes 10a and 13a from being deteriorated or broken.

  Further, since the flow rate sensor 17 is provided on the upstream side of the connection portion with the bypass circuit 13 in the hydraulic fluid circulation circuit 10 on the discharge side of the circulation pump 12, the hydraulic fluid flowing through the evaporator 24. The flow rate of can be detected reliably. Thus, the deterioration or breakage of the non-metallic pipes 10a and 13a due to the heat of the hydraulic fluid can be reliably prevented.

(Seventh embodiment)
The seventh embodiment of the hydraulic fluid cooling device of the present invention will be described. Instead of the temperature sensor 16 of the fifth embodiment, the fluid pump is discharged from the circulation pump 12 as shown by a broken line in FIG. A pressure sensor 18 for detecting the pressure of the hydraulic fluid is provided. That is, the pressure sensor 18 is provided in the bypass circuit 13 on the upstream side of the relief valve 14.

  The control device 15 stops the operation of the circulation pump 12 based on the output of the pressure sensor 18. The output value of the pressure sensor 18 is the same as that in the third embodiment, and a description thereof will be omitted.

  According to the hydraulic fluid cooling device having the above configuration, the hydraulic fluid circulation circuit 10 is substantially closed, and the hydraulic fluid discharged from the circulation pump 12 is less likely to flow smoothly through the evaporator 24. Even if the cooling efficiency of the liquid deteriorates, the pressure of the hydraulic fluid discharged from the circulation pump 12 is detected by the pressure sensor 18, and the control device 15 detects the pressure of the circulation pump based on the output of the pressure sensor 18. 12 operation is stopped.

  Thus, before the non-metallic pipe 10a of the hydraulic fluid circulation circuit 10 and the non-metallic pipe 13a of the bypass circuit 13 are deteriorated or damaged by the heat of the hydraulic fluid, the circulation pump 12 is operated. Stopping can prevent the non-metallic pipes 10a and 13a from being deteriorated or broken.

  Further, since the pressure sensor 18 is provided in the bypass circuit 13 on the upstream side of the relief valve 14, the discharge pressure of the circulation pump 12 can be reliably detected.

(Eighth embodiment)
The eighth embodiment of the hydraulic fluid cooling device of the present invention will be described. The configuration of the bypass circuit 13 of the fifth embodiment is the same as that of the fourth embodiment. That is, the bypass circuit 13 of the eighth embodiment is provided with a tank 19 (see FIG. 4) for storing hydraulic fluid downstream of the relief valve 14. As described above, since the tank 19 is provided, the hydraulic fluid discharged from the relief valve 14 can be cooled by the tank 19, and deterioration or breakage of the non-metallic pipes 10a and 13a can be prevented.

  In addition, this invention is not limited to the above-mentioned embodiment. For example, the device 3 may be an NC lathe, a grinding machine, a machine tool such as an NC dedicated machine, an industrial machine such as a molding machine or a press machine, or other various devices. The hydraulic fluid may be, for example, a lubricating fluid or a cutting fluid.

It is a simplified lineblock diagram showing one embodiment of a hydraulic fluid cooling device of this invention. It is a simplified block diagram which shows other embodiment of the hydraulic fluid cooling device of this invention. It is a simplified block diagram which shows another embodiment of the hydraulic fluid cooling device of this invention. It is a simple block diagram which shows other embodiment of the hydraulic fluid cooling device of this invention. It is a simplified block diagram which shows another embodiment of the hydraulic fluid cooling device of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydraulic fluid cooling device 3 Equipment 4 Tank 10 Hydraulic fluid circulation circuit 10a Non-metallic pipe 11 Motor 12 Circulation pump 13 Bypass circuit 13a Non-metallic pipe 14 Relief valve 15 Controller 16 Temperature sensor 17 Flow sensor 18 Pressure sensor 20 Refrigeration circuit 21 Compression Machine 22 Condenser 23 Pressure reducing mechanism 24 Evaporator

Claims (16)

A hydraulic fluid circulation circuit (10) including a non-metallic pipe (10a) at least partially circulating the hydraulic fluid of the device (3) by a circulation pump (12) driven by a motor (11);
The working fluid in the working fluid circulation circuit (10) on the discharge side of the circulation pump (12) is cooled by heat exchange with the compressor (21), the condenser (22), the decompression mechanism (23), and the refrigerant. In the hydraulic fluid cooling device including the refrigeration circuit (20) formed by sequentially connecting the evaporator (24) to be
Bypass circuit (13) for bypassing from the hydraulic fluid circulation circuit (10) between the circulation pump (12) and the evaporator (24) to the hydraulic fluid circulation circuit (10) on the suction side of the circulation pump (12). ) Is provided with a relief valve (14),
A temperature sensor (16) for detecting the temperature of the hydraulic fluid circulating between the relief valve (14) and the circulation pump (12);
A hydraulic fluid cooling device provided with a control device (15) for stopping the operation of the circulating pump (12) based on the output of the temperature sensor (16). The hydraulic fluid cooling device according to claim 1,
The temperature sensor (16) directly detects the temperature of the working fluid in the working fluid circulation circuit (10) or the bypass circuit (13). The hydraulic fluid cooling device according to claim 1,
The hydraulic fluid cooling device, wherein the temperature sensor (16) indirectly detects the temperature of the hydraulic fluid via the outer wall of the hydraulic fluid circulation circuit (10) or the bypass circuit (13). A hydraulic fluid circulation circuit (10) including a non-metallic pipe (10a) at least partially circulating the hydraulic fluid of the device (3) by a circulation pump (12) driven by a motor (11);
The working fluid in the working fluid circulation circuit (10) on the discharge side of the circulation pump (12) is cooled by heat exchange with the compressor (21), the condenser (22), the decompression mechanism (23), and the refrigerant. In the hydraulic fluid cooling device including the refrigeration circuit (20) formed by sequentially connecting the evaporator (24) to be
A bypass circuit (bypass) bypassed from the hydraulic fluid circulation circuit (10) between the circulation pump (12) and the evaporator (24) to the hydraulic fluid circulation circuit (10) on the suction side of the circulation pump (12). 13) is provided with a relief valve (14),
A flow sensor (17) for detecting the flow rate of the working fluid circulating in the working fluid circulation circuit (10) is provided;
A hydraulic fluid cooling device provided with a control device (15) for stopping the operation of the circulation pump (12) based on the output of the flow sensor (17). The hydraulic fluid cooling device according to claim 4,
The flow rate sensor (17) is provided on the downstream side of the connection portion with the bypass circuit (13) in the hydraulic fluid circulation circuit (10) on the discharge side of the circulation pump (12). Hydraulic fluid cooling device. A hydraulic fluid circulation circuit (10) including a non-metallic pipe (10a) at least partially circulating the hydraulic fluid of the device (3) by a circulation pump (12) driven by a motor (11);
The working fluid in the working fluid circulation circuit (10) on the discharge side of the circulation pump (12) is cooled by heat exchange with the compressor (21), the condenser (22), the decompression mechanism (23), and the refrigerant. In the hydraulic fluid cooling device including the refrigeration circuit (20) formed by sequentially connecting the evaporator (24) to be
A bypass circuit (bypass) bypassed from the hydraulic fluid circulation circuit (10) between the circulation pump (12) and the evaporator (24) to the hydraulic fluid circulation circuit (10) on the suction side of the circulation pump (12). 13) is provided with a relief valve (14),
A pressure sensor (18) for detecting the pressure of the hydraulic fluid discharged from the circulation pump (12);
A hydraulic fluid cooling device provided with a control device (15) for stopping the operation of the circulation pump (12) based on the output of the pressure sensor (18). The hydraulic fluid cooling device according to claim 6,
The hydraulic fluid cooling device according to claim 1, wherein the pressure sensor (18) is provided in the bypass circuit (13) upstream of the relief valve (14). In the hydraulic fluid cooling device according to any one of claims 1, 4 and 6,
The bypass circuit (13) is a pipe connecting the discharge side of the circulation pump (12) and the suction side of the circulation pump (12), and the relief valve (14) is provided in the middle of the pipe. A hydraulic fluid cooling device. A hydraulic fluid circulation circuit (10) including a non-metallic pipe (10a) at least partially circulating the hydraulic fluid of the device (3) by a circulation pump (12) driven by a motor (11);
The working fluid in the working fluid circulation circuit (10) on the discharge side of the circulation pump (12) is cooled by heat exchange with the compressor (21), the condenser (22), the decompression mechanism (23), and the refrigerant. In the hydraulic fluid cooling device including the refrigeration circuit (20) formed by sequentially connecting the evaporator (24) to be
A relief valve (14) is connected to a bypass circuit (13) for bypassing from the hydraulic fluid circulation circuit (10) downstream of the evaporator (24) to the hydraulic fluid circulation circuit (10) on the suction side of the circulation pump (12). )
A temperature sensor (16) for detecting the temperature of the hydraulic fluid circulating between the relief valve (14) and the circulation pump (12);
A hydraulic fluid cooling device provided with a control device (15) for stopping the operation of the circulating pump (12) based on the output of the temperature sensor (16). The hydraulic fluid cooling device according to claim 9,
The temperature sensor (16) directly detects the temperature of the working fluid in the working fluid circulation circuit (10) or the bypass circuit (13). The hydraulic fluid cooling device according to claim 9,
The hydraulic fluid cooling device, wherein the temperature sensor (16) indirectly detects the temperature of the hydraulic fluid via the outer wall of the hydraulic fluid circulation circuit (10) or the bypass circuit (13). A hydraulic fluid circulation circuit (10) including a non-metallic pipe (10a) at least partially circulating the hydraulic fluid of the device (3) by a circulation pump (12) driven by a motor (11);
The working fluid in the working fluid circulation circuit (10) on the discharge side of the circulation pump (12) is cooled by heat exchange with the compressor (21), the condenser (22), the decompression mechanism (23), and the refrigerant. In the hydraulic fluid cooling device including the refrigeration circuit (20) formed by sequentially connecting the evaporator (24) to be
A relief valve (14) is connected to a bypass circuit (13) for bypassing from the hydraulic fluid circulation circuit (10) downstream of the evaporator (24) to the hydraulic fluid circulation circuit (10) on the suction side of the circulation pump (12). )
A flow sensor (17) for detecting the flow rate of the working fluid circulating in the working fluid circulation circuit (10) is provided;
A hydraulic fluid cooling device provided with a control device (15) for stopping the operation of the circulation pump (12) based on the output of the flow sensor (17). The hydraulic fluid cooling device according to claim 12,
The flow rate sensor (17) is provided on the upstream side of the connection portion with the bypass circuit (13) in the hydraulic fluid circulation circuit (10) on the discharge side of the circulation pump (12). Hydraulic fluid cooling device. A hydraulic fluid circulation circuit (10) including a non-metallic pipe (10a) at least partially circulating the hydraulic fluid of the device (3) by a circulation pump (12) driven by a motor (11);
The working fluid in the working fluid circulation circuit (10) on the discharge side of the circulation pump (12) is cooled by heat exchange with the compressor (21), the condenser (22), the decompression mechanism (23), and the refrigerant. In the hydraulic fluid cooling device including the refrigeration circuit (20) formed by sequentially connecting the evaporator (24) to be
A relief valve (14) is connected to a bypass circuit (13) for bypassing from the hydraulic fluid circulation circuit (10) downstream of the evaporator (24) to the hydraulic fluid circulation circuit (10) on the suction side of the circulation pump (12). )
A pressure sensor (18) for detecting the pressure of the hydraulic fluid discharged from the circulation pump (12);
A hydraulic fluid cooling device provided with a control device (15) for stopping the operation of the circulation pump (12) based on the output of the pressure sensor (18). The hydraulic fluid cooling device according to claim 14,
The hydraulic fluid cooling device according to claim 1, wherein the pressure sensor (18) is provided in the bypass circuit (13) upstream of the relief valve (14). In the hydraulic fluid cooling device according to any one of claims 9, 12, or 14,
The bypass circuit (13) is a pipe connecting the downstream side of the evaporator (24) and the suction side of the circulation pump (12), and the relief valve (14) is provided in the middle of the pipe. A hydraulic fluid cooling device.

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