WO2013146574A1 - Water hydraulic drive system - Google Patents

Water hydraulic drive system Download PDF

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Publication number
WO2013146574A1
WO2013146574A1 PCT/JP2013/058251 JP2013058251W WO2013146574A1 WO 2013146574 A1 WO2013146574 A1 WO 2013146574A1 JP 2013058251 W JP2013058251 W JP 2013058251W WO 2013146574 A1 WO2013146574 A1 WO 2013146574A1
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WIPO (PCT)
Prior art keywords
water
refrigerant
hydraulic
working
drive system
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PCT/JP2013/058251
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French (fr)
Japanese (ja)
Inventor
宮川　新平
義博 大林
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カヤバ工業株式会社
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Publication of WO2013146574A1 publication Critical patent/WO2013146574A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/06—Use of special fluids, e.g. liquid metal; Special adaptations of fluid-pressure systems, or control of elements therefor, to the use of such fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/042—Controlling the temperature of the fluid
    • F15B21/0423—Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/26—Supply reservoir or sump assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/62—Cooling or heating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6343—Electronic controllers using input signals representing a temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/66—Temperature control methods

Definitions

  • the present invention relates to a hydraulic drive system that drives a hydraulic actuator using working water discharged from a hydraulic pump.
  • JP 2004-350588A discloses a hydraulic drive device that supplies hydraulic water pressurized to a predetermined pressure by a hydraulic pump and operates a hydraulic actuator that drives meat block processing means.
  • This water pressure drive device is provided with a working water heat exchanger that cools the working water that has been heated by the driving of the water pressure actuator before being returned to the water tank.
  • a working water heat exchanger that exchanges heat with the working water through the flow of the first cooling fluid and a first supplied to the working water heat exchanger.
  • An indoor cooler that cools the cooling fluid by heat exchange with the second cooling fluid and a cooling device that cools the second cooling fluid supplied to the indoor cooler are provided.
  • the present invention has been made in view of the above-described problems, and an object thereof is to provide a hydraulic drive system capable of cooling the working water with a simple configuration.
  • a hydraulic pump that sucks and discharges working water, a hydraulic actuator that is driven by pressurized water discharged from the hydraulic pump, and a water tank that stores the working water sucked into the hydraulic pump;
  • a refrigerant circulates in the interior, a refrigerant passage for returning heat from the hydraulic actuator to the water tank and supplying the hydraulic water to the hydraulic pump, and a refrigerant passage provided in the refrigerant passage.
  • a hydraulic drive system including a cooler that reduces a temperature of a flowing refrigerant.
  • the cooler includes a compressor that compresses the refrigerant that has been subjected to heat exchange with the working water, and a condenser that condenses the refrigerant compressed by the compressor and lowers the temperature.
  • FIG. 1 is a hydraulic circuit diagram of a hydraulic drive system according to an embodiment of the present invention.
  • the water pressure drive system 100 drives a water pressure actuator using working water as a working fluid.
  • the water pressure drive system 100 includes a water pressure pump 1 that sucks and discharges working water, a water pressure cylinder 2 and a water pressure motor 3 as water pressure actuators that are driven by pressurized water discharged from the water pressure pump 1, and a water tank 11.
  • the water pressure pump 1 is interposed in the supply passage 4 and sucks and discharges the water stored in the water tank 11.
  • the hydraulic pump 1 is rotationally driven electrically by an electric motor 1a.
  • the supply passage 4 is provided with a high-pressure line filter 4 a that removes impurities from the pressurized water discharged by the water pressure pump 1.
  • the hydraulic cylinder 2 is a linear motion actuator that can be expanded and contracted by pressurized water from the hydraulic pump 1.
  • a first fluid chamber 2b and a second fluid chamber 2c are defined by a piston 2a.
  • the hydraulic cylinder 2 expands and contracts when hydraulic fluid is supplied to the first fluid chamber 2b or the second fluid chamber 2c when the control valve 5 interposed in the supply passage 4 is switched.
  • one of the first fluid chamber 2 b and the second fluid chamber 2 c communicates with the supply passage 4, and the other of the first fluid chamber 2 b and the second fluid chamber 2 c communicates with the return passage 7.
  • the working water is recirculated to the water tank 11 through the return passage 7.
  • the return passage 7 is provided with a low-pressure line filter 7 a that removes impurities from the working water returned to the water tank 11.
  • the water pressure motor 3 is a rotary actuator that is rotationally driven by pressurized water from the water pressure pump 1.
  • the hydraulic motor 3 is rotationally driven by switching a switching valve 6 interposed in the supply passage 4.
  • the working water used for driving the hydraulic motor 3 is returned to the water tank 11 through the return passage 7.
  • a single hydraulic cylinder 2 and a single hydraulic motor 3 are provided in the hydraulic drive system 100. Not limited to this, a plurality of hydraulic cylinders 2 and hydraulic motors 3 may be provided according to the configuration of a driven system (not shown) driven by the hydraulic drive system 100. Further, only one of the hydraulic cylinder 2 and the hydraulic motor 3 may be provided.
  • connection passage 8 is short-circuited between the supply passage 4 and the return passage 7.
  • a relief valve 9 that is opened when the pressure of the pressurized water discharged by the water pressure pump 1 exceeds a set pressure is interposed in the communication passage 8. As a result, the pressure of the pressurized water discharged by the water pressure pump 1 is maintained at the set pressure.
  • the water source unit 10 detects the temperature of the working water in the water tank 11 in which the working water sucked into the hydraulic pump 1 is stored, the cooling unit 20 that cools the working water stored in the water tank 11, and the water tank 11. And a temperature switch 26 as a temperature detector.
  • the water tank 11 is a sealed tank in which water that is sucked into the hydraulic pump 1 and returned from the hydraulic cylinder 2 and the hydraulic motor 3 is stored.
  • the working water in the water tank 11 is cooled by the cooling unit 20 and maintained at a constant temperature.
  • the working water in the water tank 11 may be supplied to another hydraulic circuit used in the factory.
  • the cooling unit 20 includes a refrigerant passage 21 for exchanging heat with the working water supplied to the hydraulic pump 1 by returning to the water tank 11 from the hydraulic cylinder 2 and the hydraulic motor 3 through which the refrigerant circulates. And a cooler 22 that is provided in the passage 21 and reduces the temperature of the refrigerant flowing through the refrigerant passage 21.
  • the refrigerant passage 21 has a heat exchange portion 21a, which is a part of the refrigerant passage 21, inserted into the water tank 11 to exchange heat with the working water in the water tank 11.
  • a heat exchange portion 21a which is a part of the refrigerant passage 21, inserted into the water tank 11 to exchange heat with the working water in the water tank 11.
  • the cooler 22 includes a compressor 23 that compresses the refrigerant that has been subjected to heat exchange with the working water, and a condenser 24 that condenses the refrigerant compressed by the compressor 23 and reduces the temperature. Have.
  • the compressor 23 is a compressor that compresses the refrigerant whose temperature has been raised by heat exchange with the working water to bring it into a high-temperature and high-pressure state. By operating the compressor 23, the refrigerant in the refrigerant passage 21 circulates.
  • the condenser 24 is a heat exchanger that condenses the refrigerant compressed by the compressor 23.
  • the condenser 24 is provided with an electric fan 25 that operates in conjunction with the circulation of the refrigerant in the refrigerant passage 21. In the condenser 24, heat exchange is performed with external air, and the refrigerant is cooled.
  • the temperature switch 26 is a switch that is turned on when the detected temperature of the working water reaches a set value. When the temperature switch 26 is turned on, in the cooler 22, the compressor 23 and the fan 25 are operated to circulate the refrigerant in the refrigerant passage 21.
  • the compressor 23 and the fan 25 operate only when the temperature of the working water reaches the set value, that is, when the working water needs to be cooled. Therefore, since the cooling unit 20 does not operate when the temperature of the working water is within an appropriate range, power consumption can be reduced.
  • a cooling water circuit through which cooling water that cools the hydraulic oil flows and a refrigerant circuit through which refrigerant for cooling the cooling water in the cooling water circuit flows are provided. It was. Thus, in the hydraulic circuit, since the hydraulic oil could not be directly cooled by the refrigerant, the hydraulic oil was cooled through two heat exchanges via the cooling water. Therefore, the structure for cooling hydraulic fluid was complicated.
  • the working water in the water tank 11 can be directly cooled by the refrigerant whose temperature has been lowered by the cooler 22 provided in the refrigerant passage 21. That is, in the cooling unit 20, the working water and the cooling water can be shared by using the working water as the working fluid, and the number of heat exchanges can be reduced to one. Therefore, the working water can be cooled with a simple configuration, and the cooling efficiency can be improved by the amount of heat exchange. Further, the power consumption used for cooling the working water can be reduced by the amount that the cooling efficiency is improved.
  • the heat exchanging portion 21 a of the cooling unit 20 may be brought into contact with the return passage 7 instead of being inserted into the water tank 11. In this case, the working water returned from the return passage 7 is cooled, and the working water having an appropriate temperature is returned to the water tank 11.
  • the water source unit 10 includes a liquid level switch 27 that detects the liquid level of the working water in the water tank 11, a liquid level gauge 28 that can confirm the liquid level of the working water in the water tank 11, and the working water.
  • An air breather 29 for supplying and discharging air between the inside and outside of the water tank 11 when the liquid level of the water tank rises and falls.
  • the water source unit 10 is provided with a water supply valve 31 for switching the supply state of water into the water tank 11 and a drain valve 32 for switching the discharge state of water from the water tank 11.
  • the liquid level switch 27 is a switch that detects and switches the level of the working water in the water tank 11.
  • the liquid level switch 27 sends an electrical signal to the water supply valve 31 when the liquid level of the working water in the water tank 11 reaches the set minimum value. Thereby, the water supply valve 31 is switched to an open state, and working water is supplied into the water tank 11 from the outside.
  • the liquid level switch 27 sends an electrical signal to the drain valve 32 when the level of the working water in the water tank 11 reaches the set maximum value. As a result, the drain valve 32 is switched to the open state, and the working water in the water tank 11 is discharged to the outside.
  • the liquid level height of the working water in the water tank 11 is maintained within an appropriate range by opening and closing the water supply valve 31 and the drain valve 32 based on the electrical signal from the liquid level switch 27.
  • the liquid level gauge 28 is an instrument that allows an operator to check the liquid level in the water tank 11 from the outside.
  • the air breather 29 is attached to the upper part of the water tank 11.
  • the air breather 29 allows air to be discharged from the water tank 11 as the liquid level in the water tank 11 rises and falls.
  • the air breather 29 filters the air that enters the water tank 11 so that foreign matter does not enter the working water.
  • the working water adjusted to an appropriate temperature can be supplied by a unit integrated with the water tank 11. Further, by using the water source unit 10 as a water source for supplying working water to other hydraulic circuits used in the factory, the entire apparatus can be made compact by the amount that it is not necessary to provide a cooling unit for each hydraulic circuit. Is possible.
  • the hydraulic drive system 100 includes a refrigerant passage 21 that exchanges heat with the hydraulic water that is returned from the hydraulic cylinder 2 and the hydraulic motor 3 to the water tank 11 and supplied to the hydraulic pump 1, and a refrigerant passage that is provided in the refrigerant passage 21. And a cooler 22 that lowers the temperature of the refrigerant flowing through 21.
  • the cooler 22 includes a compressor 23 that compresses the refrigerant that has been subjected to heat exchange with the working water, and a condenser 24 that condenses the refrigerant compressed by the compressor 23. Therefore, since the working water can be directly cooled by the refrigerant whose temperature is lowered by the cooler 22 provided in the refrigerant passage 21, the working water can be cooled with a simple configuration.
  • the water pressure driving system according to the present invention can be used for all machines driven by hydraulic pressure, including manufacturing equipment having a high degree of demand for cleaning properties such as food processing equipment and semiconductor manufacturing equipment.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

A water hydraulic drive system is provided with: a water hydraulic pump for sucking operating water and discharging the operating water; a water hydraulic actuator driven by pressurized water discharged from the water hydraulic pump; a water tank for storing the operating water sucked into the water hydraulic pump; a refrigerant passage for allowing a refrigerant to circulate therethrough and causing the refrigerant to exchange heat with the operating water returned from the water hydraulic actuator to the water tank and supplied to the water hydraulic pump; and a cooler provided in the refrigerant passage and reducing the temperature of the refrigerant flowing through the refrigerant passage. The cooler has a compressor for compressing the refrigerant having been subjected to the heat exchange with the operating water, and has a condenser for condensing the refrigerant, which has been compressed by the compressor, to reduce the temperature of the refrigerant.

Description

水圧駆動システムHydraulic drive system
　本発明は、水圧ポンプから吐出された作動水を用いて水圧アクチュエータを駆動する水圧駆動システムに関するものである。 The present invention relates to a hydraulic drive system that drives a hydraulic actuator using working water discharged from a hydraulic pump.
　従来から、アクチュエータを駆動する作動流体として作動水を用いる水圧駆動システムが用いられている。水圧駆動システムでは、運転中の作動水の温度を一定に維持するために、運転中に昇温した作動水を冷却して温度を調整している。 Conventionally, a hydraulic drive system using working water as a working fluid for driving an actuator has been used. In the hydraulic drive system, in order to keep the temperature of the working water during operation constant, the temperature of the working water that has been raised during operation is cooled to adjust the temperature.
　ＪＰ２００４－３５０５８８Ａには、水圧ポンプによって所定圧力に加圧された作動水を供給し、食肉ブロック加工手段を駆動する水圧アクチュエータを作動させる水圧駆動装置が開示されている。この水圧駆動装置には、水圧アクチュエータの駆動に供されて昇温した作動水を、水タンクに戻される前に冷却する作動水熱交換機が設けられている。 JP 2004-350588A discloses a hydraulic drive device that supplies hydraulic water pressurized to a predetermined pressure by a hydraulic pump and operates a hydraulic actuator that drives meat block processing means. This water pressure drive device is provided with a working water heat exchanger that cools the working water that has been heated by the driving of the water pressure actuator before being returned to the water tank.
　しかしながら、ＪＰ２００４－３５０５８８Ａに記載の水圧駆動装置では、内部を第一の冷却用流体が流れて作動水との間で熱交換を行う作動水熱交換機と、作動水熱交換機に供給される第一の冷却用流体を第二の冷却用流体との間の熱交換によって冷却する室内クーラと、室内クーラに供給される第二の冷却用流体を冷却する冷却装置と、が設けられている。このように、第一の冷却用流体と第二の冷却用流体とが用いられるため、作動水を冷却する構成が複雑であった。 However, in the hydraulic drive apparatus described in JP2004-350588A, a working water heat exchanger that exchanges heat with the working water through the flow of the first cooling fluid and a first supplied to the working water heat exchanger. An indoor cooler that cools the cooling fluid by heat exchange with the second cooling fluid and a cooling device that cools the second cooling fluid supplied to the indoor cooler are provided. Thus, since the 1st cooling fluid and the 2nd cooling fluid are used, the structure which cools working water was complicated.
　本発明は、上記の問題点に鑑みてなされたものであり、簡素な構成で作動水を冷却可能な水圧駆動システムを提供することを目的とする。 The present invention has been made in view of the above-described problems, and an object thereof is to provide a hydraulic drive system capable of cooling the working water with a simple configuration.
　本発明のある態様によれば、作動水を吸い込んで吐出する水圧ポンプと、前記水圧ポンプから吐出された加圧水によって駆動される水圧アクチュエータと、前記水圧ポンプに吸い込まれる作動水が貯められる水タンクと、内部を冷媒が循環し、前記水圧アクチュエータから前記水タンクに戻されて前記水圧ポンプに供給される作動水との間で熱交換を行う冷媒通路と、前記冷媒通路に設けられ当該冷媒通路を流れる冷媒の温度を低下させる冷却器と、を備える水圧駆動システムが提供される。前記冷却器は、作動水との間での熱交換に供された冷媒を圧縮する圧縮機と、前記圧縮機にて圧縮された冷媒を凝縮して温度を低下させる凝縮機と、を有する。 According to an aspect of the present invention, a hydraulic pump that sucks and discharges working water, a hydraulic actuator that is driven by pressurized water discharged from the hydraulic pump, and a water tank that stores the working water sucked into the hydraulic pump; A refrigerant circulates in the interior, a refrigerant passage for returning heat from the hydraulic actuator to the water tank and supplying the hydraulic water to the hydraulic pump, and a refrigerant passage provided in the refrigerant passage. There is provided a hydraulic drive system including a cooler that reduces a temperature of a flowing refrigerant. The cooler includes a compressor that compresses the refrigerant that has been subjected to heat exchange with the working water, and a condenser that condenses the refrigerant compressed by the compressor and lowers the temperature.
　本発明の実施形態、本発明の利点については、添付された図面を参照しながら以下に詳細に説明する。 Embodiments of the present invention and advantages of the present invention will be described in detail below with reference to the accompanying drawings.
図１は、本発明の実施の形態に係る水圧駆動システムの水圧回路図である。FIG. 1 is a hydraulic circuit diagram of a hydraulic drive system according to an embodiment of the present invention.
　以下、図面を参照して、本発明の実施の形態に係る水圧駆動システム１００について説明する。 Hereinafter, a hydraulic drive system 100 according to an embodiment of the present invention will be described with reference to the drawings.
　水圧駆動システム１００は、作動流体として作動水を用いて水圧アクチュエータを駆動するものである。水圧駆動システム１００は、作動水を吸い込んで吐出する水圧ポンプ１と、水圧ポンプ１から吐出された加圧水によって駆動される水圧アクチュエータとしての水圧シリンダ２及び水圧モータ３と、水タンク１１を有して水圧ポンプ１に吸い込まれる作動水を供給する水源ユニット１０と、を備える。 The water pressure drive system 100 drives a water pressure actuator using working water as a working fluid. The water pressure drive system 100 includes a water pressure pump 1 that sucks and discharges working water, a water pressure cylinder 2 and a water pressure motor 3 as water pressure actuators that are driven by pressurized water discharged from the water pressure pump 1, and a water tank 11. A water source unit 10 for supplying the working water sucked into the hydraulic pump 1.
　水圧ポンプ１は、供給通路４に介装され、水タンク１１に貯められた水を吸い込んで吐出する。水圧ポンプ１は、電動機１ａによって電動で回転駆動される。供給通路４には、水圧ポンプ１が吐出した加圧水から不純物を除去する高圧ラインフィルタ４ａが設けられる。 The water pressure pump 1 is interposed in the supply passage 4 and sucks and discharges the water stored in the water tank 11. The hydraulic pump 1 is rotationally driven electrically by an electric motor 1a. The supply passage 4 is provided with a high-pressure line filter 4 a that removes impurities from the pressurized water discharged by the water pressure pump 1.
　水圧シリンダ２は、水圧ポンプ１からの加圧水によって伸縮可能な直動アクチュエータである。水圧シリンダ２内には、ピストン２ａによって第一流体室２ｂと第二流体室２ｃとが画成される。水圧シリンダ２は、供給通路４に介装される制御弁５が切り換えられることによって、第一流体室２ｂ又は第二流体室２ｃに作動水が供給されて伸縮する。 The hydraulic cylinder 2 is a linear motion actuator that can be expanded and contracted by pressurized water from the hydraulic pump 1. In the hydraulic cylinder 2, a first fluid chamber 2b and a second fluid chamber 2c are defined by a piston 2a. The hydraulic cylinder 2 expands and contracts when hydraulic fluid is supplied to the first fluid chamber 2b or the second fluid chamber 2c when the control valve 5 interposed in the supply passage 4 is switched.
　水圧シリンダ２では、第一流体室２ｂ及び第二流体室２ｃの一方が供給通路４に連通すると同時に、第一流体室２ｂ及び第二流体室２ｃの他方が戻り通路７に連通する。戻り通路７に連通した第一流体室２ｂ又は第二流体室２ｃからは、戻り通路７を通じて水タンク１１に作動水が還流される。戻り通路７には、水タンク１１に戻される作動水から不純物を除去する低圧ラインフィルタ７ａが設けられる。 In the hydraulic cylinder 2, one of the first fluid chamber 2 b and the second fluid chamber 2 c communicates with the supply passage 4, and the other of the first fluid chamber 2 b and the second fluid chamber 2 c communicates with the return passage 7. From the first fluid chamber 2 b or the second fluid chamber 2 c communicating with the return passage 7, the working water is recirculated to the water tank 11 through the return passage 7. The return passage 7 is provided with a low-pressure line filter 7 a that removes impurities from the working water returned to the water tank 11.
　水圧モータ３は、水圧ポンプ１からの加圧水によって回転駆動される回転アクチュエータである。水圧モータ３は、供給通路４に介装される切換弁６が切り換えられることによって回転駆動される。水圧モータ３の駆動に供された作動水は、戻り通路７を通じて水タンク１１に還流される。 The water pressure motor 3 is a rotary actuator that is rotationally driven by pressurized water from the water pressure pump 1. The hydraulic motor 3 is rotationally driven by switching a switching valve 6 interposed in the supply passage 4. The working water used for driving the hydraulic motor 3 is returned to the water tank 11 through the return passage 7.
　水圧駆動システム１００では、単一の水圧シリンダ２と単一の水圧モータ３とが設けられている。これに限らず、水圧駆動システム１００によって駆動される被駆動システム（図示省略）の構成に応じて、水圧シリンダ２と水圧モータ３とを複数設けてもよい。また、水圧シリンダ２及び水圧モータ３のいずれか一方のみを設けてもよい。 In the hydraulic drive system 100, a single hydraulic cylinder 2 and a single hydraulic motor 3 are provided. Not limited to this, a plurality of hydraulic cylinders 2 and hydraulic motors 3 may be provided according to the configuration of a driven system (not shown) driven by the hydraulic drive system 100. Further, only one of the hydraulic cylinder 2 and the hydraulic motor 3 may be provided.
　供給通路４と戻り通路７との間は、連通通路８によって短絡される。連通通路８には、水圧ポンプ１が吐出した加圧水の圧力が設定圧力を超えた場合に開状態となるリリーフ弁９が介装される。これにより、水圧ポンプ１が吐出した加圧水の圧力が、設定圧力に維持されることとなる。 The connection passage 8 is short-circuited between the supply passage 4 and the return passage 7. A relief valve 9 that is opened when the pressure of the pressurized water discharged by the water pressure pump 1 exceeds a set pressure is interposed in the communication passage 8. As a result, the pressure of the pressurized water discharged by the water pressure pump 1 is maintained at the set pressure.
　水源ユニット１０は、水圧ポンプ１に吸い込まれる作動水が貯められる水タンク１１と、水タンク１１に貯められた作動水を冷却する冷却ユニット２０と、水タンク１１内の作動水の温度を検出する温度検出器としての温度スイッチ２６と、を備える。 The water source unit 10 detects the temperature of the working water in the water tank 11 in which the working water sucked into the hydraulic pump 1 is stored, the cooling unit 20 that cools the working water stored in the water tank 11, and the water tank 11. And a temperature switch 26 as a temperature detector.
　水タンク１１は、水圧ポンプ１に吸い込まれて水圧シリンダ２及び水圧モータ３から還流される水が貯められる密閉型のタンクである。水タンク１１内の作動水は、冷却ユニット２０によって冷却され、一定の温度に維持される。水タンク１１内の作動水を、工場内で用いられる他の水圧回路にも供給可能としてもよい。 The water tank 11 is a sealed tank in which water that is sucked into the hydraulic pump 1 and returned from the hydraulic cylinder 2 and the hydraulic motor 3 is stored. The working water in the water tank 11 is cooled by the cooling unit 20 and maintained at a constant temperature. The working water in the water tank 11 may be supplied to another hydraulic circuit used in the factory.
　冷却ユニット２０は、内部を冷媒が循環して水圧シリンダ２及び水圧モータ３から水タンク１１に戻されて水圧ポンプ１に供給される作動水との間で熱交換を行う冷媒通路２１と、冷媒通路２１に設けられて当該冷媒通路２１を流れる冷媒の温度を低下させる冷却器２２と、を備える。 The cooling unit 20 includes a refrigerant passage 21 for exchanging heat with the working water supplied to the hydraulic pump 1 by returning to the water tank 11 from the hydraulic cylinder 2 and the hydraulic motor 3 through which the refrigerant circulates. And a cooler 22 that is provided in the passage 21 and reduces the temperature of the refrigerant flowing through the refrigerant passage 21.
　冷媒通路２１は、その一部である熱交換部２１ａが水タンク１１内に挿入され、水タンク１１内の作動水との間で熱交換を行う。水タンク１１内の作動水が昇温している場合、冷媒通路２１を流れる冷媒は、熱交換部２１ａにて作動水との間で熱交換を行い、水タンク１１内の作動水を冷却する。 The refrigerant passage 21 has a heat exchange portion 21a, which is a part of the refrigerant passage 21, inserted into the water tank 11 to exchange heat with the working water in the water tank 11. When the working water in the water tank 11 is heated, the refrigerant flowing through the refrigerant passage 21 exchanges heat with the working water in the heat exchanging portion 21a to cool the working water in the water tank 11. .
　冷却器２２は、作動水との間での熱交換に供された冷媒を圧縮する圧縮機２３と、圧縮機２３にて圧縮された冷媒を凝縮して温度を低下させる凝縮機２４と、を有する。 The cooler 22 includes a compressor 23 that compresses the refrigerant that has been subjected to heat exchange with the working water, and a condenser 24 that condenses the refrigerant compressed by the compressor 23 and reduces the temperature. Have.
　圧縮機２３は、作動水との間の熱交換によって昇温した冷媒を圧縮して高温高圧の状態にするコンプレッサである。圧縮機２３が作動することで、冷媒通路２１内の冷媒が循環する。 The compressor 23 is a compressor that compresses the refrigerant whose temperature has been raised by heat exchange with the working water to bring it into a high-temperature and high-pressure state. By operating the compressor 23, the refrigerant in the refrigerant passage 21 circulates.
　凝縮機２４は、圧縮機２３にて圧縮された冷媒を凝縮する熱交換機である。凝縮機２４には、冷媒通路２１内を冷媒が循環する際に連動して作動する電動のファン２５が設けられる。凝縮機２４では、外部の空気との間で熱交換が行われ、冷媒が冷却される。 The condenser 24 is a heat exchanger that condenses the refrigerant compressed by the compressor 23. The condenser 24 is provided with an electric fan 25 that operates in conjunction with the circulation of the refrigerant in the refrigerant passage 21. In the condenser 24, heat exchange is performed with external air, and the refrigerant is cooled.
　温度スイッチ２６は、検出した作動水の温度が設定値に達した場合にオンに切り換えられるスイッチである。温度スイッチ２６がオンに切り換えられると、冷却器２２では、圧縮機２３とファン２５とが作動して、冷媒通路２１内の冷媒を循環させる。 The temperature switch 26 is a switch that is turned on when the detected temperature of the working water reaches a set value. When the temperature switch 26 is turned on, in the cooler 22, the compressor 23 and the fan 25 are operated to circulate the refrigerant in the refrigerant passage 21.
　このように、圧縮機２３とファン２５とは、作動水の温度が設定値に達した場合、即ち作動水の冷却が必要となった場合にのみ作動する。よって、作動水の温度が適正な範囲内である場合には冷却ユニット２０が作動しないため、消費電力を低減することができる。 Thus, the compressor 23 and the fan 25 operate only when the temperature of the working water reaches the set value, that is, when the working water needs to be cooled. Therefore, since the cooling unit 20 does not operate when the temperature of the working water is within an appropriate range, power consumption can be reduced.
　ここで、作動流体として作動油を用いる従来の油圧回路では、作動油を冷却する冷却水が流れる冷却水回路と、冷却水回路の冷却水を冷却するための冷媒が流れる冷媒回路とが設けられていた。このように、油圧回路では、作動油を冷媒で直接冷却することができなかったため、冷却水を介して二度の熱交換を経て作動油を冷却していた。そのため、作動油を冷却するための構成が複雑であった。 Here, in a conventional hydraulic circuit that uses hydraulic oil as a working fluid, a cooling water circuit through which cooling water that cools the hydraulic oil flows and a refrigerant circuit through which refrigerant for cooling the cooling water in the cooling water circuit flows are provided. It was. Thus, in the hydraulic circuit, since the hydraulic oil could not be directly cooled by the refrigerant, the hydraulic oil was cooled through two heat exchanges via the cooling water. Therefore, the structure for cooling hydraulic fluid was complicated.
　これに対して、冷却ユニット２０では、冷媒通路２１に設けられる冷却器２２にて温度が低下した冷媒によって水タンク１１内の作動水を直接冷却できる。即ち、冷却ユニット２０では、作動流体として作動水を用いることで、作動水と冷却水とを共通化することができ、熱交換の回数を一回にすることができる。したがって、簡素な構成で作動水を冷却することができ、熱交換の回数が減った分だけ冷却効率を向上させることができる。また、冷却効率が向上した分だけ、作動水の冷却に用いられる消費電力を低減することができる。 In contrast, in the cooling unit 20, the working water in the water tank 11 can be directly cooled by the refrigerant whose temperature has been lowered by the cooler 22 provided in the refrigerant passage 21. That is, in the cooling unit 20, the working water and the cooling water can be shared by using the working water as the working fluid, and the number of heat exchanges can be reduced to one. Therefore, the working water can be cooled with a simple configuration, and the cooling efficiency can be improved by the amount of heat exchange. Further, the power consumption used for cooling the working water can be reduced by the amount that the cooling efficiency is improved.
　なお、冷却ユニット２０の熱交換部２１ａを水タンク１１に挿入するのではなく、戻り通路７に当接させてもよい。この場合、戻り通路７から還流される作動水が冷却され、適正な温度となった作動水が水タンク１１に還流されることとなる。 Note that the heat exchanging portion 21 a of the cooling unit 20 may be brought into contact with the return passage 7 instead of being inserted into the water tank 11. In this case, the working water returned from the return passage 7 is cooled, and the working water having an appropriate temperature is returned to the water tank 11.
　水源ユニット１０は、水タンク１１内の作動水の液面高さを検出する液面スイッチ２７と、水タンク１１内の作動水の液面高さを確認可能な液面計２８と、作動水の液面が上下した場合に水タンク１１の内部と外部との間で空気を給排するエアブリーザ２９と、を備える。 The water source unit 10 includes a liquid level switch 27 that detects the liquid level of the working water in the water tank 11, a liquid level gauge 28 that can confirm the liquid level of the working water in the water tank 11, and the working water. An air breather 29 for supplying and discharging air between the inside and outside of the water tank 11 when the liquid level of the water tank rises and falls.
　また、水源ユニット１０には、水タンク１１内への水の供給状態を切り換える給水バルブ３１と、水タンク１１からの水の排出状態を切り換える排水バルブ３２と、が設けられる。 Further, the water source unit 10 is provided with a water supply valve 31 for switching the supply state of water into the water tank 11 and a drain valve 32 for switching the discharge state of water from the water tank 11.
　液面スイッチ２７は、水タンク１１内の作動水の液面高さを検出して切り換えられるスイッチである。液面スイッチ２７は、水タンク１１内の作動水の液面高さが設定最低値に達した場合に、給水バルブ３１に電気信号を送る。これにより、給水バルブ３１が開状態に切り換えられ、外部から水タンク１１内に作動水が供給される。 The liquid level switch 27 is a switch that detects and switches the level of the working water in the water tank 11. The liquid level switch 27 sends an electrical signal to the water supply valve 31 when the liquid level of the working water in the water tank 11 reaches the set minimum value. Thereby, the water supply valve 31 is switched to an open state, and working water is supplied into the water tank 11 from the outside.
　また、液面スイッチ２７は、水タンク１１内の作動水の液面高さが設定最高値に達した場合に、排水バルブ３２に電気信号を送る。これにより、排水バルブ３２が開状態に切り換えられ、水タンク１１内の作動水が外部に排出される。 Also, the liquid level switch 27 sends an electrical signal to the drain valve 32 when the level of the working water in the water tank 11 reaches the set maximum value. As a result, the drain valve 32 is switched to the open state, and the working water in the water tank 11 is discharged to the outside.
　このように、液面スイッチ２７からの電気信号に基づいて給水バルブ３１と排水バルブ３２とが開閉されることによって、水タンク１１内の作動水の液面高さが適正な範囲内に維持される。 In this manner, the liquid level height of the working water in the water tank 11 is maintained within an appropriate range by opening and closing the water supply valve 31 and the drain valve 32 based on the electrical signal from the liquid level switch 27. The
　液面計２８は、外部から作業者が水タンク１１内の液面高さを確認可能な計器である。 The liquid level gauge 28 is an instrument that allows an operator to check the liquid level in the water tank 11 from the outside.
　エアブリーザ２９は、水タンク１１の上部に取り付けられる。エアブリーザ２９は、水タンク１１内の液面の上下に伴って水タンク１１からの空気の排出を許容する。エアブリーザ２９は、水タンク１１内に進入する空気を濾過して作動水に異物が混入しないようにしている。 The air breather 29 is attached to the upper part of the water tank 11. The air breather 29 allows air to be discharged from the water tank 11 as the liquid level in the water tank 11 rises and falls. The air breather 29 filters the air that enters the water tank 11 so that foreign matter does not enter the working water.
　以上のように、水タンク１１と冷却ユニット２０とを備える水源ユニット１０が設けられることによって、水タンク１１と一体のユニットで、適正な温度に調整された作動水を供給することができる。また、水源ユニット１０を、工場内で用いられる他の水圧回路にも作動水を供給する水源として用いることで、各々の水圧回路に冷却ユニットを設ける必要がない分だけ、装置全体のコンパクト化が可能である。 As described above, by providing the water source unit 10 including the water tank 11 and the cooling unit 20, the working water adjusted to an appropriate temperature can be supplied by a unit integrated with the water tank 11. Further, by using the water source unit 10 as a water source for supplying working water to other hydraulic circuits used in the factory, the entire apparatus can be made compact by the amount that it is not necessary to provide a cooling unit for each hydraulic circuit. Is possible.
　以上の実施の形態によれば、以下に示す効果を奏する。 According to the above embodiment, the following effects are obtained.
　水圧駆動システム１００は、水圧シリンダ２及び水圧モータ３から水タンク１１に戻され水圧ポンプ１に供給される作動水との間で熱交換を行う冷媒通路２１と、冷媒通路２１に設けられ冷媒通路２１を流れる冷媒の温度を低下させる冷却器２２と、を備える。冷却器２２は、作動水との間での熱交換に供された冷媒を圧縮する圧縮機２３と、圧縮機２３にて圧縮された冷媒を凝縮する凝縮機２４と、を有する。したがって、冷媒通路２１に設けられる冷却器２２にて温度が低下した冷媒によって作動水を直接冷却できるため、簡素な構成で作動水を冷却できる。 The hydraulic drive system 100 includes a refrigerant passage 21 that exchanges heat with the hydraulic water that is returned from the hydraulic cylinder 2 and the hydraulic motor 3 to the water tank 11 and supplied to the hydraulic pump 1, and a refrigerant passage that is provided in the refrigerant passage 21. And a cooler 22 that lowers the temperature of the refrigerant flowing through 21. The cooler 22 includes a compressor 23 that compresses the refrigerant that has been subjected to heat exchange with the working water, and a condenser 24 that condenses the refrigerant compressed by the compressor 23. Therefore, since the working water can be directly cooled by the refrigerant whose temperature is lowered by the cooler 22 provided in the refrigerant passage 21, the working water can be cooled with a simple configuration.
　以上、本発明の実施形態について説明したが、上記実施形態は本発明の適用例の一部を示したに過ぎず、本発明の技術的範囲を上記実施形態の具体的構成に限定する趣旨ではない。 The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.
　本願は、２０１２年３月２９日に日本国特許庁に出願された特願２０１２－０７６３５６に基づく優先権を主張し、この出願の全ての内容は参照により本明細書に組み込まれる。 This application claims priority based on Japanese Patent Application No. 2012-076356 filed with the Japan Patent Office on March 29, 2012, the entire contents of which are incorporated herein by reference.
　本発明に係る水圧駆動システムは、例えば食品加工設備や半導体製造設備など、洗浄性への要求度が高い製造設備をはじめ、液圧で駆動される機械全般に利用することができる。 The water pressure driving system according to the present invention can be used for all machines driven by hydraulic pressure, including manufacturing equipment having a high degree of demand for cleaning properties such as food processing equipment and semiconductor manufacturing equipment.
　この発明の実施例が包含する排他的性質又は特徴は、以下のようにクレームされる。 The exclusive properties or features encompassed by the embodiments of the present invention are claimed as follows.

Claims (4)

  1. 　作動水を吸い込んで吐出する水圧ポンプと、
    　前記水圧ポンプから吐出された加圧水によって駆動される水圧アクチュエータと、
    　前記水圧ポンプに吸い込まれる作動水が貯められる水タンクと、
    　内部を冷媒が循環し、前記水圧アクチュエータから前記水タンクに戻されて前記水圧ポンプに供給される作動水との間で熱交換を行う冷媒通路と、
    　前記冷媒通路に設けられ、当該冷媒通路を流れる冷媒の温度を低下させる冷却器と、を備え、
    　前記冷却器は、
    　作動水との間での熱交換に供された冷媒を圧縮する圧縮機と、
    　前記圧縮機にて圧縮された冷媒を凝縮して温度を低下させる凝縮機と、を有する水圧駆動システム。     A hydraulic pump that draws in and discharges working water;
    A hydraulic actuator driven by pressurized water discharged from the hydraulic pump;
    A water tank in which the working water sucked into the hydraulic pump is stored;
    A refrigerant passage in which the refrigerant circulates and exchanges heat with the working water returned from the hydraulic actuator to the water tank and supplied to the hydraulic pump;
    A cooler that is provided in the refrigerant passage and reduces the temperature of the refrigerant flowing through the refrigerant passage;
    The cooler is
    A compressor that compresses the refrigerant subjected to heat exchange with the working water;
    And a condenser that condenses the refrigerant compressed by the compressor and lowers the temperature.
  2. 　請求項１に記載の水圧駆動システムにおいて、
    　前記冷媒通路は、その一部が前記水タンク内に挿入され、前記水タンク内の作動水との間で熱交換を行う水圧駆動システム。     The hydraulic drive system according to claim 1,
    A part of the refrigerant passage is inserted into the water tank, and a water pressure drive system performs heat exchange with the working water in the water tank.
  3. 　請求項１に記載の水圧駆動システムにおいて、
    　前記凝縮機には、前記冷媒通路内を冷媒が循環する際に連動して作動するファンが設けられる水圧駆動システム。     The hydraulic drive system according to claim 1,
    A water pressure drive system in which the condenser is provided with a fan that operates in conjunction with the refrigerant circulating in the refrigerant passage.
  4. 　請求項１に記載の水圧駆動システムにおいて、
    　前記水タンク内の作動水の温度を検出する温度検出器を更に備え、
    　前記冷却器は、前記温度検出器によって検出された作動水の温度が設定値に達した場合に前記冷媒通路内の冷媒を循環させる水圧駆動システム。     The hydraulic drive system according to claim 1,
    A temperature detector for detecting the temperature of the working water in the water tank;
    The water cooler drive system in which the cooler circulates the refrigerant in the refrigerant passage when the temperature of the working water detected by the temperature detector reaches a set value.
PCT/JP2013/058251 2012-03-29 2013-03-22 Water hydraulic drive system WO2013146574A1 (en)

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CN111175000B (en) * 2020-03-13 2021-08-03 湖南科技大学 Dual cooling system suitable for large-displacement electro-hydraulic servo actuator

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JPS54130769A (en) * 1978-03-31 1979-10-11 Hitachi Ltd Hydraulic circuit
JPS6136707U (en) * 1984-08-09 1986-03-07 三菱電機株式会社 hydraulic generator
JP2002174208A (en) * 2000-12-08 2002-06-21 Mitsubishi Heavy Ind Ltd Actuating water cooling device for working vehicle including forklift truck

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JPS54130769A (en) * 1978-03-31 1979-10-11 Hitachi Ltd Hydraulic circuit
JPS6136707U (en) * 1984-08-09 1986-03-07 三菱電機株式会社 hydraulic generator
JP2002174208A (en) * 2000-12-08 2002-06-21 Mitsubishi Heavy Ind Ltd Actuating water cooling device for working vehicle including forklift truck

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110185676A (en) * 2019-06-05 2019-08-30 深圳市粤永能源环保科技有限公司 A kind of pure water hydraulics system

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