JP2009133522A - Hydraulic system and food processing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic system and a food processing apparatus capable of decreasing energy consumption and reducing a load to an environment. <P>SOLUTION: This hydraulic system includes: a compressor 23 driven by a hydraulic actuator 24; a heat pump circuit 41 where a refrigerant compressed by the compressor 23 is circulated; an expansion valve 21 for reducing the pressure of the refrigerant circulated through the heat pump circuit 41; a high pressure side heat exchanger 22 for discharging the heat of the refrigerant flowing from the compressor 23 to the expansion valve 21; and a low pressure side heat exchanger 20 for applying heat to the refrigerant flowing from the expansion valve 21 to the compressor 23, wherein the low pressure side heat exchanger 20 includes a refrigerant circulating passage where the refrigerant flowing out of the expansion valve 21 in the heat pump circuit 41 is circulated, and a working water circulating passage where working water discharged from hydraulic actuators 12, 14, 24, 29 is circulated through a working water discharge circuit 52, and heat exchange is performed between the refrigerant flowing through the heat pump circuit 41 and the working water flowing through the working water discharge circuit 52. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an improvement in a hydraulic system and a food processing apparatus that drive a hydraulic actuator when pressurized hydraulic water is supplied.

  The food processing apparatus disclosed in Patent Document 1 includes a hydraulic actuator such as a hydraulic cylinder or a hydraulic motor that uses water as a working fluid, and the hydraulic actuator is controlled using a hydraulic control valve. ing.

  In this case, cleaning can be performed by spraying high-temperature cleaning water onto the hydraulic actuator, and the safety and health performance can be improved.

Patent Document 2 discloses a water heater that heats hot water using a heat pump. This heat pump is adapted to transfer heat absorbed from air to hot water.
JP 2002-238444 A JP 2006-105527 A

  However, since the temperature of the working water circulating in the conventional water pressure system rises due to the load operation performed by the water pressure actuator and the water pressure control valve, it is necessary to cool the water to prevent the water pressure actuator and the water pressure control valve from being overheated. was there.

  On the other hand, a conventional hot water supply device using a heat pump absorbs heat from the air, and therefore cannot recover the heat energy of the working water circulating in the hydraulic system, and the heat of the working water is wasted. was there.

  The present invention has been made in view of the above problems, and an object thereof is to provide a hydraulic system and a food processing apparatus that reduce energy consumption and have a low environmental load.

  The present invention relates to a hydraulic drive device including a hydraulic water supply circuit that guides pressurized hydraulic water to a hydraulic actuator and a hydraulic water discharge circuit that guides hydraulic water discharged from the hydraulic actuator, the compressor being driven by the hydraulic actuator A heat pump circuit through which the refrigerant compressed by the compressor circulates, an expansion valve that decompresses the refrigerant that circulates through the heat pump circuit, and a high-pressure side heat exchanger that releases the heat of the refrigerant flowing from the compressor to the expansion valve, A low-pressure heat exchanger that applies heat to the refrigerant flowing from the expansion valve to the compressor. The low-pressure heat exchanger includes a refrigerant circulation passage through which the refrigerant flowing out of the expansion valve circulates in the heat pump circuit, and a hydraulic actuator. A working water circulation passage through which the working water discharged through the working water discharge circuit circulates. Characterized by being configured to perform heat exchange between the working water flowing through the refrigerant and the operating water discharge circuit flowing.

  According to the present invention, in the low pressure side heat exchanger, the refrigerant depressurized by the expansion valve is vaporized from liquid to gas in the process of flowing through the refrigerant circulation passage, and at this time, the heat absorbed by the refrigerant flows through the working water circulation passage. Deprived of water, heating the refrigerant and cooling the working water. This makes it possible to effectively use the heat of the working water whose temperature has increased due to the load operation performed by the water pressure actuator and the water pressure control valve.

  The compressor of the heat pump circuit is driven by a water pressure actuator, and the heat energy of the heat pump circuit is heated by the heat energy of the working water whose temperature has been increased by the load operation of the water pressure actuator. It is possible to provide a hydraulic system with a low load on the vehicle. At the same time, it becomes possible to clean, disinfect, and sterilize the food processing apparatus using hot water heated by heat effectively recovered by the heat pump system.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a configuration diagram of a food processing apparatus 30 that automatically processes, for example, meat.

  The food processing apparatus 30 includes a conveyor 31 that horizontally moves a workpiece such as meat, a table 32 that raises and lowers the workpiece, and a processing machine (not shown) that performs processing such as cutting on the conveyor 31 and the workpiece carried by the table 32. The operation of the conveyor 31 and the table 32 is controlled by the controller 50, and the workpiece is automatically processed (see Patent Document 1).

  Note that the load operation performed by the food processing apparatus 30 is not limited to the horizontal movement, ascent, and descent of the workpiece, and for example, rotation, holding, cleaning, sterilization, and the like of the workpiece are performed.

  The conveyor 31 and the table 32 are driven by a hydraulic actuator. A hydraulic motor 14 is provided as a hydraulic actuator that drives the conveyor 31. A hydraulic cylinder 12 is provided as a hydraulic actuator for driving the table 32.

  A water pressure unit 1 is provided as a water pressure source for supplying pressurized hydraulic water to these water pressure actuators 12 and 14.

  The hydraulic unit 1 includes a hydraulic tank 10 that stores working water, and a hydraulic pump 2 that sucks and pressurizes the working water in the hydraulic tank 10. As means for supplying water to the water pressure tank 10, a water supply circuit 34 is connected to the water pressure tank 10 via an electromagnetic valve 36. The opening and closing of the electromagnetic valve 36 is controlled by the controller 50. When the amount of water stored in the hydraulic tank 10 falls below a predetermined value, the electromagnetic valve 36 is opened, and water from the water supply circuit 34 is supplied to the hydraulic tank 10.

  An electric motor 3 is provided as a power source for the food processing apparatus 30, and the hydraulic pump 2 is driven by the electric motor 3. The electric motor 3 is provided separately from other devices so as not to be exposed to warm water or the like for cleaning the workpiece or the processing machine.

  The power source of the food processing apparatus 30 is not limited to the electric motor 3, and a hydraulic motor, a pneumatic motor, or the like may be used.

  A working water supply circuit 51 and a working water discharge circuit 52 are disposed between the water pressure unit 1 and the water pressure actuators 12 and 14. Pressurized hydraulic water discharged from the hydraulic pump 2 is supplied to the hydraulic actuators 12 and 14 through the hydraulic water supply circuit 51, and hydraulic water discharged from the hydraulic actuators 12 and 14 passes through the hydraulic water discharge circuit 52 to water pressure Returned to the tank 10. In the working water supply circuit 51, electromagnetic valves 5, 6 and the like are interposed, and the flow rate of the pressurized working water guided to the water pressure actuators 12, 14 is adjusted.

  The working water discharge circuit 52 is not limited to the configuration that returns to the hydraulic tank 10, and the working water discharged from the hydraulic actuators 12 and 14 may be discharged to the outside.

  A bypass circuit 53 that communicates the working water supply circuit 51 and the working water discharge circuit 52 is disposed, and the pressure regulating valve 7 is interposed in the bypass circuit 53. The pressure regulating valve 7 opens when the pressure of the working water supply circuit 51 rises above a predetermined value, whereby the pressure of the working water supply circuit 51 is maintained at a predetermined value.

  As means for performing high-temperature cleaning and high-temperature sterilization of workpieces and processing machines, a nozzle 11 that injects hot water onto the workpieces and processing machines, a hot water storage unit 26 that stores the hot water, and a heat pump unit 19 that heats the hot water of the hot water storage unit 26. With.

  The hot water storage unit 26 includes a hot water storage tank 27 that stores hot water, and a circulation pump 28 that circulates the hot water in the hot water storage tank 27 with the heat pump unit 19.

  As a means for supplying water to the hot water storage tank 27, a hot water supply circuit 34 is connected to the hot water storage tank 27 via an electromagnetic valve 18. The opening and closing of the solenoid valve 18 is controlled by the controller 50. When the amount of water stored in the hot water storage tank 27 falls below a predetermined value, the electromagnetic valve 18 is opened, and water from the water supply circuit 34 is supplied to the hot water storage tank 27.

  A hot water supply circuit 35 and a working water supply circuit 51 are connected to the nozzle 11 via the temperature adjustment valve 16. The hot water supply circuit 35 guides hot water from the hot water storage tank 27 to the nozzle 11, while the working water supply circuit 51 guides cold water from the water pressure unit 1 to the nozzle 11.

  The temperature adjustment valve 16 adjusts the opening degree of the hot water supply circuit 35 and the opening degree of the working water supply circuit 51 with respect to the nozzle 11 based on a command from the controller 50. Hot water guided from the hot water supply circuit 35 and cold water guided from the working water supply circuit 51 are mixed by the temperature adjustment valve 16 and supplied to the nozzle 11, and hot water adjusted to a predetermined temperature is injected from the nozzle 11. As a result, high temperature cleaning and high temperature sterilization of the workpiece and the processing machine are performed.

  A bypass circuit 37 connecting the hot water supply circuit 35 and the water supply circuit 34 is provided, and the temperature adjustment valve 17 is interposed in the bypass circuit 37. The temperature adjustment valve 17 adjusts the opening degree of the bypass circuit 37 based on a command from the controller 50. The cold water guided from the water supply circuit 34 by the temperature adjusting valve 17 is mixed with the hot water guided from the hot water storage tank 27, and hot water adjusted to a predetermined temperature is supplied from the nozzle 38.

  As means for heating the hot water in the hot water storage tank 27, a heating circuit 33 that connects the hot water storage tank 27 and the heat pump unit 19 is provided, and a circulation pump 28 is interposed in the heating circuit 33. The hot water is circulated between the hot water storage tank 27 and the heat pump unit 19 through the heating circuit 33 by the circulation pump 28 as indicated by an arrow in the figure.

  A hydraulic motor 29 is provided as a hydraulic actuator for driving the circulation pump 28. An electromagnetic valve 15 is interposed in the passage of the hydraulic water supply circuit 51 that guides the pressurized hydraulic water from the hydraulic unit 1 to the hydraulic motor 29, and the opening and closing of the electromagnetic valve 15 is controlled by the controller 50. Thereby, the circulation pump 28 operates so as to keep the temperature of the hot water stored in the hot water storage tank 27 at a predetermined value.

  Meanwhile, the operating water circulating between the hydraulic unit 1 and the hydraulic actuators 12, 14, 24, 29 rises in temperature due to heat generated in the process of passing through the electromagnetic valves 5, 6, 15 and the pressure regulating valve 7, and The temperature rises due to heat generated by the operating load of the actuators 12, 14, 24, and 29.

  For this reason, conventionally, a heat exchanger that dissipates the heat of the working water that has flowed out of the hydraulic actuators 12, 14, 24, and 29 and increased in temperature to the atmosphere is provided, and the hydraulic actuators 12, 14, 24, and 29 are overheated. It was supposed to be prevented.

  In the present invention, the heat of the working water discharged from the hydraulic actuators 12, 14, 24, and 29 is heated in order to effectively use the heat of the working water that has flowed out of the hydraulic actuators 12, 14, 24, and 29 and increased in temperature. A heat pump unit 19 for transferring to the hot water circulating through the circuit 33 is provided.

  In the heat pump unit 19, a compressor 23, a high-pressure side heat exchanger 22, an expansion valve 21, and a low-pressure side heat exchanger 20 are interposed in a heat pump circuit 41. As the refrigerant circulates through the heat pump circuit 41, the heat absorbed by the low-pressure side heat exchanger 20 is transferred to the high-pressure side heat exchanger 22 to dissipate heat.

  The compressor 23 works to raise the temperature of the refrigerant by sucking and compressing the refrigerant.

  A hydraulic motor 24 is provided as a hydraulic actuator that drives the compressor 23. An electromagnetic valve 25 is interposed in the passage of the hydraulic water supply circuit 51 that guides pressurized hydraulic water from the hydraulic unit 1 to the hydraulic motor 24, and the opening and closing of the electromagnetic valve 25 is controlled by the controller 50. Thereby, the compressor 23 operates so as to keep the temperature of the hot water stored in the hot water storage tank 27 at a predetermined value.

  The high-pressure side heat exchanger 22 includes a refrigerant circulation passage through which the refrigerant discharged from the compressor 23 circulates in the heat pump circuit 41 and a hot water circulation passage through which the hot water discharged from the circulation pump 28 circulates in the heating circuit 33. The heat exchange is performed between the refrigerant circulating in the heat pump circuit 41 and the hot water circulating in the heating circuit 33.

  In the high pressure side heat exchanger 22, the refrigerant pressurized by the compressor 23 solidifies from gas to liquid in the process of flowing through the refrigerant circulation passage, and at this time, the heat generated from the refrigerant is transmitted to the hot water flowing through the hot water circulation passage. , Warm water temperature is raised.

  The expansion valve 21 functions to depressurize the high-pressure refrigerant and lower the temperature of the refrigerant.

  The low pressure side heat exchanger 20 is discharged from the refrigerant circulation passage through which the refrigerant flowing out of the expansion valve 21 circulates in the heat pump circuit 41 and the hydraulic water discharge circuit 52 from the water pressure actuators 12, 14, 24, 29. A working water circulation passage through which water circulates is provided, and heat exchange is performed between the refrigerant circulating in the heat pump circuit 41 and the working water circulating in the working water discharge circuit 52. In the low pressure side heat exchanger 20, the refrigerant decompressed by the expansion valve 21 is vaporized from liquid to gas in the process of flowing through the refrigerant circulation passage, and at this time, the heat absorbed by the refrigerant is taken away from the working water flowing through the working water circulation passage. The refrigerant is heated and the working water is cooled.

  The controller 50 controls the operation of the electric motor 3, the electromagnetic valves 4 to 6, 15, the switching control valve 13, and the temperature adjustment valves 17, 16, so Done automatically.

  The food processing apparatus 30 is comprised as mentioned above, and demonstrates an effect | action and effect next.

  The operating water of the hydraulic unit 1 rises in temperature due to heat generated in the process of passing through the solenoid valves 5, 6, 15 and the pressure regulating valve 7, and is also generated by heat generated by the operating load of the hydraulic actuators 12, 14, 24, 29. Although the temperature rises, the temperature is lowered by cooling through the heat pump unit 19 in the process of returning to the hydraulic tank 10 through the working water discharge circuit 52, and the hydraulic actuators 12, 14, 24, 29 are overheated. Thus, the transfer of the workpiece, the processing, the workpiece and the processing, the operation of the heat pump unit 19 and the like are performed smoothly.

  On the other hand, the hot water circulating through the heating circuit 33 is heated via the heat pump unit 19 and the temperature of the hot water stored in the hot water storage tank 27 is increased to a predetermined value or more. The heat pump unit 19 collects the thermal energy of the working water passing through the working water discharge circuit 52 and heats the hot water in the heating circuit 33. Therefore, the conventional heat pump hot water supply device pumps up the thermal energy using air as a heat source to heat the hot water. Compared to the above, it is possible to provide a hydraulic system that significantly reduces energy consumption and has a low environmental impact.

  The food processing apparatus 30 includes all the actuators 12 and 14 provided in a conveyor 31 that conveys workpieces, a table 32, a workpiece processing machine (not shown), a hot water storage unit 26 that circulates hot water, and a heat pump unit 19 that circulates refrigerant. , 24 and 29 are configured to be operated by the hydraulic pressure supplied from the hydraulic unit 1, so that no oil mist or the like is generated unlike an electric actuator or a pneumatic actuator, and safety and hygiene aspects required for the food processing apparatus 30 The performance can be ensured, the response is better than using these actuators, and the performance can be improved.

  Further, by using the hydraulic actuators 12, 14, 24, and 29, it is possible to provide a safe system that does not leak oil and contaminate the surrounding environment unlike the hydraulic actuator, and does not need to be oil-proofed or fire-proofed.

  Further, by using the hydraulic actuators 12, 14, 24, 29, it is possible to provide a highly efficient system with less energy loss than the pneumatic actuator.

  The water pressure actuators 12, 14, 24, 29 are cleaned while the water pressure actuators 12, 14, 24, 29 are operated without performing disassembly work, such as an electric actuator, a hydraulic actuator, and a pneumatic actuator. It becomes possible to wash with warm water. Thereby, the food processing apparatus 30 can be operated continuously and productivity can be improved.

  The hydraulic actuators 12, 14, 24, and 29 do not need to be waterproof and drip-proof unlike the electric actuators, hydraulic actuators, and pneumatic actuators, simplifying the structure of the food processing apparatus 30 and reducing the size.

  By using the hydraulic actuators 12, 14, 24, and 29 in the drive system of the food processing apparatus 30, the maintenance technology is unified, and maintenance and inspection can be performed easily.

  In the present embodiment, a working water supply circuit 51 that guides pressurized working water to the hydraulic actuators 12, 14, 24, and 29, and a working water discharge circuit that guides working water discharged from the hydraulic actuators 12, 14, 24, and 29. 52, a compressor 23 driven by a hydraulic actuator 24, a heat pump circuit 41 in which a refrigerant compressed by the compressor 23 circulates, and an expansion for depressurizing the refrigerant circulated in the heat pump circuit 41. A valve 21, a high-pressure side heat exchanger 22 that releases heat of refrigerant flowing from the compressor 23 to the expansion valve 21, and a low-pressure side heat exchanger 20 that supplies heat to the refrigerant flowing from the expansion valve 21 to the compressor 23. The low-pressure heat exchanger 20 is a refrigerant in which the refrigerant flowing out of the expansion valve 21 circulates in the heat pump circuit 41. And a working water circulation passage through which the working water discharged from the hydraulic actuators 12, 14, 24, and 29 passes through the working water discharge circuit 52, and the refrigerant flowing through the heat pump circuit 41 and the working water discharge circuit 52 are provided. It was set as the structure which heat-exchanges with the flowing working water.

  Based on the above configuration, in the low pressure side heat exchanger 20, the refrigerant decompressed by the expansion valve 21 is vaporized from liquid to gas in the process of flowing through the refrigerant circulation passage, and at this time, the heat absorbed by the refrigerant passes through the working water circulation passage. Deprived from the flowing working water, heating the refrigerant and cooling the working water are performed. This makes it possible to effectively use the heat of the working water whose temperature has increased due to the load operation of the hydraulic actuators 12, 14, 24, and 29.

  In the present embodiment, the compressor 23 of the heat pump circuit 41 is driven by the hydraulic actuator 24, and the refrigerant of the heat pump circuit 41 is heated by the heat energy of the working water whose temperature has increased due to the load operation of the hydraulic actuator 24, so the refrigerant is heated. Therefore, it is possible to provide a hydraulic system that reduces the energy consumption required for the operation, reduces the energy consumption required for cooling the working water, and has a low environmental load.

  In the present embodiment, a circulation pump 28 driven by a hydraulic actuator 29 and a heating circuit 33 through which hot water is circulated by the circulation pump 28 are provided. The high-pressure heat exchanger 22 is connected to the compressor 23 by a heat pump circuit 41. A refrigerant circulation passage through which the discharged refrigerant circulates and a hot water circulation passage through which the hot water of the heating circuit 33 circulates, and heat exchange is performed between the refrigerant that circulates through the heat pump circuit 41 and the hot water that circulates through the heating circuit 33. It was set as the structure.

  Based on the above configuration, in the high pressure side heat exchanger 22, the refrigerant pressurized by the compressor 23 solidifies from gas to liquid in the process of flowing through the refrigerant circulation passage, and at this time, the heat generated from the refrigerant flows through the hot water circulation passage. It is transmitted to warm water and the temperature of warm water is raised.

  In the present embodiment, the circulation pump 28 of the heating circuit 33 is driven by the hydraulic actuator 29 to recover the thermal energy of the working water whose temperature has been increased by the load operation of the hydraulic actuator 29 to heat the hot water of the heating circuit 33. It is possible to provide a water pressure system that reduces energy consumption necessary for heating the hot water and has a low environmental load.

  In the present embodiment, the nozzle 11 for injecting hot water, the hot water storage unit 26 for storing the hot water, and the hot water supply circuit 35 for supplying the hot water stored in the hot water storage unit 26 to the nozzle 11 are provided. The heating circuit 33 is connected, and heat exchange is performed between the refrigerant circulating in the heat pump circuit 41 and the hot water of the hot water storage unit 26 circulating in the heating circuit 33.

  Based on the above configuration, the hot water sprayed from the nozzle 11 is heated in order to recover the thermal energy of the working water whose temperature has been raised by the load operation of the hydraulic actuators 12, 14, 24, 29 and to heat the hot water in the heating circuit 33. Therefore, it is possible to provide a hydraulic system that reduces energy consumption required for the environment and has a low environmental load.

  In the present embodiment, the temperature adjustment valve 16 that connects the hot water supply circuit 35 and the working water supply circuit 51 to the nozzle 11 is provided, and the hot water and the working water supplied from the hot water supply circuit 35 by the temperature adjustment valve 16 are provided. The configuration is such that cold water guided from the circuit 51 is mixed and supplied to the nozzle 11.

  Based on the above configuration, hot water adjusted to a predetermined temperature is ejected from the nozzle 11. As a result, high temperature cleaning and high temperature sterilization of the workpiece and the processing machine are performed.

  The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

  The water pressure system of the present invention can be used not only for food processing apparatuses but also for other apparatuses and facilities related to medical care, medical work, cosmetics, etc. that require safety, hygiene, and cleanliness, such as washing and sterilization.

The system diagram of the food processing apparatus which shows embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water pressure unit 2 Water pressure pump 11 Nozzle 12, 14, 24, 29 Water pressure actuator 16 Temperature control valve 20 Low pressure side heat exchanger 21 Expansion valve 22 High pressure side heat exchanger 23 Compressor 28 Circulation pump 30 Food processing apparatus 33 Heating circuit 41 Heat pump Circuit 52 Hydraulic water discharge circuit

Claims (5)

A working water supply circuit for guiding pressurized working water to a hydraulic actuator;
A hydraulic drive device comprising a hydraulic water discharge circuit for guiding hydraulic water discharged from the hydraulic actuator,
A compressor driven by the hydraulic actuator;
A heat pump circuit in which the refrigerant compressed by the compressor circulates;
An expansion valve for decompressing the refrigerant circulating in the heat pump circuit;
A high-pressure side heat exchanger that releases heat of refrigerant flowing from the compressor to the expansion valve;
A low pressure side heat exchanger that applies heat to the refrigerant flowing from the expansion valve to the compressor,
This low-pressure side heat exchanger
A refrigerant circulation passage through which refrigerant flowing out of the expansion valve circulates in the heat pump circuit;
A working water circulation passage through which the working water discharged from the hydraulic actuator through the working water discharge circuit circulates,
A hydraulic system characterized in that heat exchange is performed between the refrigerant flowing through the heat pump circuit and the working water flowing through the working water discharge circuit. A circulating pump driven by the hydraulic actuator;
With a heating circuit through which hot water circulates by this circulation pump,
The high-pressure side heat exchanger is
A refrigerant circulation passage through which refrigerant discharged from the compressor circulates in the heat pump circuit;
A hot water circulation passage through which hot water of the heating circuit circulates,
The water pressure system according to claim 1, wherein heat exchange is performed between the refrigerant circulating in the heat pump circuit and the hot water circulating in the heating circuit. A nozzle for injecting hot water;
A hot water storage unit for storing this hot water,
A hot water supply circuit for supplying hot water stored in the hot water storage unit to the nozzle,
Connect the heating circuit to this hot water storage unit,
The water pressure system according to claim 2, wherein heat exchange is performed between the refrigerant circulating in the heat pump circuit and the hot water of the hot water storage unit circulating in the heating circuit. A temperature adjustment valve for connecting the hot water supply circuit and the working water supply circuit to the nozzle;
The water pressure system according to claim 3, wherein hot water guided from the hot water supply circuit and cold water guided from the working water supply circuit are mixed and supplied to the nozzle by the temperature control valve. .   A food processing apparatus comprising the hydraulic system according to any one of claims 1 to 4.

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