KR20110072072A - Cooling system of hydraulic oil having thermostat - Google Patents

Cooling system of hydraulic oil having thermostat Download PDF

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Publication number
KR20110072072A
KR20110072072A KR1020090128848A KR20090128848A KR20110072072A KR 20110072072 A KR20110072072 A KR 20110072072A KR 1020090128848 A KR1020090128848 A KR 1020090128848A KR 20090128848 A KR20090128848 A KR 20090128848A KR 20110072072 A KR20110072072 A KR 20110072072A
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South Korea
Prior art keywords
hydraulic
oil
return line
oil cooler
thermostat
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KR1020090128848A
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Korean (ko)
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남명남
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볼보 컨스트럭션 이큅먼트 에이비
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Priority to KR1020090128848A priority Critical patent/KR20110072072A/en
Publication of KR20110072072A publication Critical patent/KR20110072072A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/16—Controlling lubricant pressure or quantity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/02—Arrangements of lubricant conduits
    • 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
    • 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

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

Abstract

PURPOSE: A working-fluid cooling system comprising a thermostat is provided to prevent overheating or super-cooling of working fluid due to an oil cooler since the amount of working fluid flowing to the oil cooler is controlled depending on initially predetermined pressure and the setting temperature of the thermostat. CONSTITUTION: A working-fluid cooling system comprising a thermostat comprises a hydraulic pump(1), an actuator, a control valve(2), a first return line(6), a second return line(8) and a thermostat(9). The actuator is connected to the hydraulic pump. The control valve is installed in the flow path between the actuator and the hydraulic pump. The control valve controls the driving, stop and direction change of the actuator. An oil cooler(4), which cools working fluid returning from the control valve to a hydraulic tank(3), is installed on the first return line. A first check valve(5) is installed over the oil cooler on the first return line. The second return line returns working fluid returned from the controller to the hydraulic tank.

Description

정온기가 구비된 작동유 냉각시스템{cooling system of hydraulic oil having thermostat}Cooling system of hydraulic oil having thermostat

본 발명은 붐실린더 등의 각종 액츄에이터로부터 유압탱크로 귀환되는 작동유의 고온 또는 저온에 따라 오일쿨러로 이동되는 작동유 량을 조절하여, 오일쿨러에 의해 작동유가 과냉되거나, 과열되는 것을 방지할 수 있도록한 정온기가 구비된 작동유 냉각시스템에 관한 것이다.The present invention is to adjust the amount of operating oil to be moved to the oil cooler according to the high or low temperature of the hydraulic oil returned to the hydraulic tank from various actuators, such as boom cylinder, so that the operating oil is prevented from being overcooled or overheated by the oil cooler It relates to a hydraulic fluid cooling system provided with a constant temperature.

더욱 상세하게는, 유압탱크로 귀환되는 작동유를 냉각시키는 오일쿨러의 상류측에 작동유의 온도에 따라 유량 조절이 가능한 정온기를 설치하여, 유압시스템에 요구되는 초기 설정압력에 의해 오일쿨러로 이동되는 작동유 량을 결정하고, 정온기의 셋팅 온도에 따라 오일쿨러로 배출되는 작동유 량을 조절하여, 오일쿨러의 냉각성능을 최적조건으로 유지할 수 있도록한 정온기가 구비된 작동유 냉각시스템에 관한 것이다.More specifically, the oil is moved to the oil cooler by the initial set pressure required for the hydraulic system by installing a thermostat capable of adjusting the flow rate according to the temperature of the hydraulic oil upstream of the oil cooler for cooling the hydraulic oil returned to the hydraulic tank The present invention relates to a hydraulic fluid cooling system equipped with a thermostat for determining the amount and adjusting the amount of working oil discharged to the oil cooler according to the set temperature of the thermostat, so that the cooling performance of the oil cooler can be maintained at the optimum condition.

일반적으로, 건설장비의 각종 액츄에이터(유압모터, 유압실린더 등을 말함.) 는 유압펌프의 구동에 따라 공급라인을 따라 유압탱크로부터 공급되는 작동유에 의해 구동된다. 액츄에이터로부터 귀환되는 작동유는 리턴라인을 따라 유압탱크로 귀환된다. 이때 유압탱크로 귀환되는 작동유는 60∼100℃의 고온으로 상승되므로 리턴라인에 설치된 오일쿨러에 의해 냉각된 후 유압탱크로 귀환된다.Generally, various actuators (referring to a hydraulic motor, a hydraulic cylinder, etc.) of construction equipment are driven by hydraulic oil supplied from a hydraulic tank along a supply line according to the driving of a hydraulic pump. The hydraulic oil returned from the actuator is returned to the hydraulic tank along the return line. At this time, the hydraulic oil is returned to the hydraulic tank is raised to a high temperature of 60 ~ 100 ℃ is cooled by the oil cooler installed in the return line and then returned to the hydraulic tank.

도 1에 도시된 종래 기술의 작동유 냉각시스템은,The hydraulic fluid cooling system of the prior art shown in Figure 1,

적어도 하나 이상의 유압펌프(1)와,At least one hydraulic pump 1,

유압펌프(1)에 연결되는 적어도 하나 이상의 미 도시된 액츄에이터(유압모터, 유압실린더 등을 말함.)와,At least one or more non-illustrated actuator (referring to a hydraulic motor, a hydraulic cylinder, etc.) connected to the hydraulic pump 1,

유압펌프(1)와 액츄에이터 사이의 유로에 설치되고, 절환시 액츄에이터의 기동, 정지 및 방향전환을 제어하는 컨트롤밸브(2)(MCV)와,A control valve 2 (MCV) installed in the flow path between the hydraulic pump 1 and the actuator for controlling the start, stop and direction change of the actuator during switching;

컨트롤밸브(2)로부터 유압탱크(3)로 귀환되는 작동유를 냉각시키는 오일쿨러(4)가 설치되고, 오일쿨러(4) 상류측에 제1체크밸브(5)가 설치되는 제1리턴라인(6)과,An oil cooler 4 for cooling hydraulic oil returned from the control valve 2 to the hydraulic tank 3, and a first return line having a first check valve 5 installed upstream of the oil cooler 4 ( 6) and,

제1리턴라인(6)에 분기접속되고, 제2체크밸브(7)가 설치되며, 컨트롤러(2)로부터 귀환되는 작동유를 오일쿨러(4)를 경유하지않고 유압탱크(3)로 곧바로 귀환시키는 제2리턴라인(8)을 포함한다.Branched connection to the first return line (6), the second check valve (7) is provided, the hydraulic oil returned from the controller (2) directly to the hydraulic tank (3) without passing through the oil cooler (4) And a second return line 8.

도 2에 도시된 종래 다른 기술의 작동유 냉각시스템은,The hydraulic fluid cooling system of another prior art shown in Figure 2,

적어도 하나 이상의 유압펌프(1)와,At least one hydraulic pump 1,

유압펌프(1)에 연결되는 적어도 하나 이상의 미 도시된 액츄에이터(유압모터, 유압실린더 등을 말함.)와,At least one or more non-illustrated actuator (referring to a hydraulic motor, a hydraulic cylinder, etc.) connected to the hydraulic pump 1,

유압펌프(1)와 액츄에이터 사이의 유로에 설치되고, 절환시 액츄에이터의 기동, 정지 및 방향전환을 제어하는 컨트롤밸브(2)(MCV)와,A control valve 2 (MCV) installed in the flow path between the hydraulic pump 1 and the actuator for controlling the start, stop and direction change of the actuator during switching;

컨트롤밸브(2)로부터 유압탱크(3)로 귀환되는 작동유를 냉각시키는 오일쿨러(4)가 설치되고, 오일쿨러(4) 상류측에 제1체크밸브(5)가 설치되는 제1리턴라인(6)과,An oil cooler 4 for cooling hydraulic oil returned from the control valve 2 to the hydraulic tank 3, and a first return line having a first check valve 5 installed upstream of the oil cooler 4 ( 6) and,

제1리턴라인(6)에 분기접속되고, 컨트롤러(2)로부터 귀환되는 작동유를 오일쿨러(4)를 경유하지않고 유압탱크(3)로 곧바로 귀환시키는 제2리턴라인(8)을 포함한다.And a second return line 8 which is branched to the first return line 6 and returns the hydraulic oil returned from the controller 2 directly to the hydraulic tank 3 without passing through the oil cooler 4.

도 1 및 도 2에 도시된 종래 기술의 작동유 냉각 시스템은, 전술한 컨트롤밸브(2)로부터 제1리턴라인(6)을 따라 귀환되는 작동유는 오일쿨러(4)를 경유하여 냉각된 후 유압탱크(3)로 귀환된다. 반면에 컨트롤러(2)로부터 제2리턴라인(8)을 따라 이동되는 작동유는 유압탱크(3)로 곧바로 귀환된다.In the hydraulic oil cooling system of the prior art shown in FIGS. 1 and 2, the hydraulic oil returned from the aforementioned control valve 2 along the first return line 6 is cooled via the oil cooler 4 and then the hydraulic tank. Return to (3). On the other hand, the hydraulic oil moved from the controller 2 along the second return line 8 is directly returned to the hydraulic tank 3.

이때, 컨트롤러(2)로부터 제1리턴라인(6)을 통해 오일쿨러(4)를 경유하여 유압탱크(3)로 귀환되는 작동유의 량은, 작동유 온도와 무관하게 제1체크밸브(5)의 설정압력에 따라 분배 결정된다.At this time, the amount of hydraulic oil returned from the controller 2 to the hydraulic tank 3 via the oil cooler 4 through the first return line 6 is independent of the hydraulic oil temperature of the first check valve 5. The distribution is determined by the set pressure.

이로 인해 작업 조건에 따라 오일쿨러(4)에 공급되는 작동유 량이 너무 많아지는 경우, 오일쿨러(4)에 의해 작동유가 충분하게 냉각되지않은 상태로 유압탱 크(3)로 귀환된다. 반면에 오일쿨러(4)에 공급되는 작동유 량이 너무 적어질 경우에는 오일쿨러(4)에 의해 작동유가 과냉되어 유압탱크(3)로 귀환된다.As a result, when the amount of working oil supplied to the oil cooler 4 becomes too large according to the working conditions, the working oil is returned to the hydraulic tank 3 without being sufficiently cooled by the oil cooler 4. On the other hand, when the amount of working oil supplied to the oil cooler 4 becomes too small, the working oil is supercooled by the oil cooler 4 and returned to the hydraulic tank 3.

이로 인해 작업 조건에 따라 오일 쿨러(4)에 공급되는 작동유 온도가 높으나 설정 압력 이하인 경우 오일쿨러(4)로 가는 작동유 량이 적절히 많지 않아 충분하게 냉각되지 않은 상태로 유압탱크(3)로 귀환된다. 반면에 오일쿨러(4)에 공급되는 작동유 온도는 낮으나 설정 압력 이상인 경우 오일쿨러(4)를 경우하면서 냉각되는 작동유 량이 증가되어 과냉되어 유압탱크(3)로 귀환된다.Therefore, when the operating oil temperature supplied to the oil cooler (4) is high depending on the working conditions but less than the set pressure, the amount of working oil to the oil cooler (4) is not appropriately large enough to be returned to the hydraulic tank (3) without being sufficiently cooled. On the other hand, when the operating oil temperature supplied to the oil cooler 4 is low but above the set pressure, the amount of working oil cooled while the oil cooler 4 is increased is supercooled and returned to the hydraulic tank 3.

즉 오일쿨러(4)가 냉각기능을 충분하게 발휘할 수 없어 작동유가 고온일 경우 액츄에이터가 정상적으로 작동할 수 없어 작업성 및 신뢰성이 떨어지는 문제점을 갖는다.That is, the oil cooler 4 is not able to sufficiently exhibit the cooling function, when the operating oil is a high temperature, the actuator can not operate normally has a problem that the workability and reliability is low.

본 발명의 실시예는, 오일쿨러의 상류측에 정온기(thermostat)를 설치하여, 유압시스템에 요구되는 초기 설정압력과, 정온기의 셋팅 온도에 따라 오일쿨러로 배출되는 작동유 량을 조절하여, 오일쿨러에 의해 작동유가 과냉되거나, 과열되는 것을 방지할 수 있도록한 정온기가 구비된 작동유 냉각시스템과 관련된다.Embodiment of the present invention, by installing a thermostat upstream of the oil cooler, by adjusting the operating pressure discharged to the oil cooler according to the initial set pressure required for the hydraulic system, and the setting temperature of the thermostat, the oil cooler It relates to a hydraulic fluid cooling system equipped with a constant temperature to prevent the hydraulic fluid from being overcooled or overheated by.

본 발명의 실시예에 의한 정온기가 구비된 작동유 냉각시스템은,Hydraulic fluid cooling system provided with a thermostat according to an embodiment of the present invention,

적어도 하나 이상의 유압펌프와,At least one hydraulic pump,

유압펌프에 연결되는 적어도 하나 이상의 액츄에이터와,At least one actuator connected to the hydraulic pump,

유압펌프와 액츄에이터 사이의 유로에 설치되고, 절환시 액츄에이터의 기동, 정지 및 방향전환을 제어하는 컨트롤밸브와,A control valve installed in a flow path between the hydraulic pump and the actuator and controlling the start, stop, and direction change of the actuator during switching;

컨트롤밸브로부터 유압탱크로 귀환되는 작동유를 냉각시키는 오일쿨러가 설치되고, 오일쿨러 상류측에 제1체크밸브가 설치되는 제1리턴라인과,An oil cooler for cooling hydraulic oil returned from the control valve to the hydraulic tank, the first return line having a first check valve installed upstream of the oil cooler,

제1리턴라인에 분기접속되고, 컨트롤러로부터 귀환되는 작동유를 오일쿨러를 경유하지않고 유압탱크로 귀환시키는 제2리턴라인과,A second return line branched to the first return line and returning hydraulic oil returned from the controller to the hydraulic tank without passing through the oil cooler;

제1체크밸브와 오일쿨러 사이의 제1리턴라인에 설치되고, 제1리턴라인을 따라 귀환되는 작동유의 온도에 따라 오일쿨러로 배출되는 작동유 량을 조절하는 정온기를 포함한다.It is installed on the first return line between the first check valve and the oil cooler, and includes a thermostat for adjusting the amount of operating oil discharged to the oil cooler according to the temperature of the working oil returned along the first return line.

바람직한 실시예에 의하면, 전술한 제2리턴라인에 설치되는 제2체크밸브를 포함한다.According to a preferred embodiment, it includes a second check valve installed in the aforementioned second return line.

전술한 바와 같이 구성되는 본 발명의 실시예에 의한 정온기가 구비된 작동유 냉각시스템은 아래와 같은 이점을 갖는다.The hydraulic fluid cooling system provided with the constant temperature according to the embodiment of the present invention configured as described above has the following advantages.

오일쿨러의 상류측에 정온기를 설치하여, 유압시스템에 요구되는 초기 설정압력과 정온기의 셋팅 온도에 따라 오일쿨러로 이동되는 작동유 량을 조절하여, 오일쿨러에 의해 작동유가 과냉되거나, 과열되는 것을 방지함에 따라, 유압탱크 내의 작동유가 항시 적정온도(60℃ 이하를 말함.)를 유지할 수 있어 유압시스템을 보호하고 작업성을 향상시킬 수 있다.By installing a thermostat on the upstream side of the oil cooler, it adjusts the working oil flow to the oil cooler according to the initial set pressure required for the hydraulic system and the setting temperature of the thermostat, thereby preventing the oil cooler from overcooling or overheating. As a result, the hydraulic oil in the hydraulic tank can always maintain the proper temperature (hereinafter referred to as 60 ° C or less), thereby protecting the hydraulic system and improving workability.

이하, 본 발명의 바람직한 실시예를 첨부된 도면을 참조하여 상세하게 설명하되, 이는 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 발명을 용이하게 실시할 수 있을 정도로 상세하게 설명하기 위한 것이지, 이로 인해 본 발명의 기술적인 사상 및 범주가 한정되는 것을 의미하지는 않는 것이다.DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which is intended to explain in detail enough to enable those skilled in the art to easily practice the present invention. This does not mean that the technical spirit and scope of the present invention is limited.

도 3에 도시된 본 발명의 실시예에 의한 정온기가 구비된 작동유 냉각시스템은,3 is a hydraulic fluid cooling system having a constant temperature according to an embodiment of the present invention shown in FIG.

적어도 하나 이상의 유압펌프(1)와,At least one hydraulic pump 1,

유압펌프(1)에 연결되는 적어도 하나 이상의 액츄에이터(미 도시된 유압모터, 유압실린더 등)와,At least one actuator (not shown hydraulic motor, hydraulic cylinder, etc.) connected to the hydraulic pump 1,

유압펌프(1)와 액츄에이터 사이의 유로에 설치되고, 절환시 액츄에이터의 기동, 정지 및 방향전환을 제어하는 컨트롤밸브(2)(MCV)와,A control valve 2 (MCV) installed in the flow path between the hydraulic pump 1 and the actuator for controlling the start, stop and direction change of the actuator during switching;

컨트롤밸브(2)로부터 유압탱크(3)로 귀환되는 작동유를 냉각시키는 오일쿨러(4)가 설치되고, 오일쿨러(4) 상류측에 제1체크밸브(5)가 설치되는 제1리턴라인(6)과,An oil cooler 4 for cooling hydraulic oil returned from the control valve 2 to the hydraulic tank 3, and a first return line having a first check valve 5 installed upstream of the oil cooler 4 ( 6) and,

제1리턴라인(6)에 분기접속되고, 제2체크밸브(7)가 설치되며, 컨트롤러(2)로부터 귀환되는 작동유를 오일쿨러를 경유하지않고 유압탱크(3)로 곧바로 귀환시키는 제2리턴라인(8)과,The second return is branched to the first return line 6, the second check valve (7) is installed, the second return to return the hydraulic oil from the controller (2) directly to the hydraulic tank (3) without passing through the oil cooler With line 8,

제1체크밸브와 오일쿨러(4) 사이의 제1리턴라인(6)에 설치되고, 제1리턴라인(6)을 따라 귀환되는 작동유의 고온, 저온에 따라 오일쿨러(4)로 배출되는 작동유 량을 조절하는 정온기(9)(thermostat)를 포함한다.Hydraulic oil installed in the first return line 6 between the first check valve and the oil cooler 4 and discharged to the oil cooler 4 according to the high and low temperatures of the hydraulic oil returned along the first return line 6. It includes a thermostat 9 (thermostat) for adjusting the amount.

전술한 정온기(9)에 유입되는 작동유의 온도를 검출하고, 검출된 작동유의 온도에 따라 오일쿨러(4)로 배출되는 작동유 량을 조절하는 기술내용은, 정온기(9)에 유입되는 작동유의 온도에 따라 작동유가 흘러가는 개구 면적이 달라져 오일쿨러(4)로 배출되는 작동유 량을 조절하는 기술은, 당해분야에서 사용되는 기술내용 이므로 이의 구성 및 작동의 상세한 설명은 생략한다.The technical content of detecting the temperature of the hydraulic oil flowing into the above-mentioned thermostat 9 and adjusting the amount of operating oil discharged to the oil cooler 4 according to the detected temperature of the hydraulic oil is the temperature of the hydraulic oil flowing into the thermostat 9. As the opening area through which the working oil flows is changed according to the technique, the technique of adjusting the working oil amount discharged to the oil cooler 4 is a technical content used in the art, and thus detailed descriptions of the configuration and operation thereof will be omitted.

이때 전술한 제2리턴라인(6)에 설치되며, 유압탱크(3)로 귀환되는 작동유의 온도에 따라 오일쿨러(4)측으로 배출되는 작동유 량을 조절하는 정온기(9)를 제외한 작동유 냉각시스템의 구성은, 도 1에 도시된 작동유 냉각시스템의 구성과 실질적으로 동일하므로 이들의 구성 및 작동의 상세한 설명은 생략하고 중복되는 도면부호는 동일하게 표기한다.At this time, installed in the above-mentioned second return line (6) of the hydraulic fluid cooling system other than the thermostat (9) for adjusting the amount of operating oil discharged to the oil cooler (4) side in accordance with the temperature of the hydraulic oil returned to the hydraulic tank (3) Since the configuration is substantially the same as the configuration of the hydraulic oil cooling system shown in FIG.

이하에서, 본 발명의 실시예에 의한 정온기가 구비된 작동유 냉각시스템의 사용예를 첨부된 도면을 참조하여 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings an example of the use of the hydraulic fluid cooling system with a thermostat according to an embodiment of the present invention will be described in detail.

도 3에 도시된 바와 같이, 전술한 유압펌프(1)로부터 토출되는 작동유는 컨트롤밸브(2)를 경유하여 미 도시된 액츄에이터(유압실린더 등)에 공급되어 이를 구동시킨 후, 액츄에이터로부터의 작동유는 컨트롤밸브(2)를 경유하여 유압탱크(3)로 귀환된다.As shown in FIG. 3, the hydraulic oil discharged from the above-described hydraulic pump 1 is supplied to an actuator (not shown) such as a hydraulic cylinder via the control valve 2 to drive the hydraulic oil from the actuator. Return to the hydraulic tank (3) via the control valve (2).

이때 컨트롤밸브(2)를 통과하는 작동유 일부는 제1리턴라인(6)에 설치된 제1체크밸브(5)와, 정온기(9) 및 오일쿨러(4)를 차례로 경유하므로, 오일쿨러(4)에 의해 냉각된 후 유압탱크(3)로 귀환된다. 반면에 컨트롤밸브(2)를 통과하는 작동유 일부는 제2리턴라인(8)에 설치된 제2체크밸브(7)를 경유하므로 오일쿨러(3)에 의해 냉각되지않은 상태로 유압탱크(3)로 곧바로 귀환된다.In this case, a part of the hydraulic oil passing through the control valve 2 passes through the first check valve 5 installed in the first return line 6, the thermostat 9, and the oil cooler 4 in order, and thus the oil cooler 4. After being cooled by the gas, it is returned to the hydraulic tank (3). On the other hand, a part of the hydraulic oil passing through the control valve (2) via the second check valve (7) installed in the second return line (8) to the hydraulic tank (3) without being cooled by the oil cooler (3) It is returned immediately.

한편, 컨트롤러(2)를 통과하는 작동유가 제1리턴라인(6)과 제2리턴라인(8)으로 분배되는 것은, 제1,2체크밸브(5,7)의 초기 설정압력에 의해 작동유 량이 결정된다.On the other hand, the hydraulic oil passing through the controller 2 is distributed to the first return line 6 and the second return line 8 by the initial set pressure of the first and second check valves 5 and 7. Is determined.

이때 제2리턴라인(6)에 설치된 정온기(9)에 의해 감지되는 작동유 온도에 따라 오일쿨러(4)측으로 배출되는 작동유 량을 결정한다. 즉 컨트롤러(2)로부터 정온기(9)에 유입되는 작동유의 온도가 설정된 온도값 이하일 경우에는 오일쿨러(4)측으로 배출되는 작동유 량을 감소시킨다(개구율이 낮아짐.). 반면에 컨트롤러(2)로부터 정온기(9)에 유입되는 작동유의 온도가 설정된 온도값 이상일 경우에는 오일쿨러(4)측으로 배출되는 작동유 량을 상대적으로 증대시킨다(개구율이 높아짐.).At this time, the amount of hydraulic fluid discharged to the oil cooler 4 is determined according to the hydraulic oil temperature sensed by the thermostat 9 installed in the second return line 6. That is, when the temperature of the hydraulic oil flowing into the thermostat 9 from the controller 2 is lower than the set temperature value, the operating oil discharged to the oil cooler 4 side is reduced (opening ratio is lowered.). On the other hand, when the temperature of the hydraulic oil flowing into the thermostat 9 from the controller 2 is higher than the set temperature value, the operating oil discharged to the oil cooler 4 side is relatively increased (opening ratio is increased).

전술한 바와 같이 본 발명의 실시예에 의한 작동유 냉각시스템에 의하면, 미 도시된 액츄에이터로부터 컨트롤러(2)를 경유하여 유압탱크(3)로 귀환되는 작동유는 제1,2체크밸브(5,7)의 설정압력에 의해 오일쿨러(3)로 공급되는 작동유 량이 결정된다. 동시에 제2리턴라인(6)에 설치된 정온기(9)에 의한 작동유의 온도에 따라 오일쿨러(4)로 공급되는 작동유 량을 결정하여 냉각시킨다.As described above, according to the hydraulic fluid cooling system according to the exemplary embodiment of the present invention, the hydraulic oil returned from the not shown actuator to the hydraulic tank 3 via the controller 2 is first and second check valves 5 and 7. The operating pressure supplied to the oil cooler 3 is determined by the set pressure of. At the same time, the amount of operating oil supplied to the oil cooler 4 is determined and cooled according to the temperature of the operating oil by the thermostat 9 installed in the second return line 6.

따라서, 유압탱크(3)로 귀환되는 작동유가 오일쿨러(4)에 최적인 조건으로 분배 공급되므로 오일쿨러(4)에 의해 작동유가 과냉되거나, 과열되는 것이 방지된다. 이로 인해 유압탱크(3) 내의 작동유 온도를 항시 적정온도 내로 유지할 수 있고 유압시스템을 보호할 수 있다.Therefore, since the hydraulic oil returned to the hydraulic tank 3 is supplied to the oil cooler 4 in an optimal condition, the hydraulic oil is prevented from being overcooled or overheated by the oil cooler 4. As a result, the hydraulic oil temperature in the hydraulic tank 3 can be maintained at an appropriate temperature at all times and the hydraulic system can be protected.

도 1은 종래 기술에 의한 작동유 냉각시스템의 개략도,1 is a schematic view of a hydraulic fluid cooling system according to the prior art,

도 2는 종래 다른 기술에 의한 작동유 냉각시스템의 개략도,Figure 2 is a schematic diagram of a hydraulic fluid cooling system according to another prior art,

도 3은 본 발명의 실시예에 의한 정온기가 구비된 작동유 냉각시스템의 유압회로도이다.Figure 3 is a hydraulic circuit diagram of a hydraulic fluid cooling system provided with a thermostat according to an embodiment of the present invention.

*도면중 주요 부분에 사용된 부호의 설명* Explanation of symbols used in the main part of the drawing

1; 유압펌프One; Hydraulic pump

2; 컨트롤밸브(MCV)2; Control Valve (MCV)

3; 유압탱크3; Hydraulic tank

4; 오일쿨러4; Oil cooler

5; 제1체크밸브5; First check valve

6; 제1리턴라인6; 1st return line

7; 제2체크밸브7; 2nd check valve

8; 제2리턴라인8; 2nd return line

9; 정온기(thermostat)9; Thermostat

Claims (2)

적어도 하나 이상의 유압펌프;At least one hydraulic pump; 상기 유압펌프에 연결되는 적어도 하나 이상의 액츄에이터;At least one actuator connected to the hydraulic pump; 상기 유압펌프와 액츄에이터 사이의 유로에 설치되고, 절환시 상기 액츄에이터의 기동, 정지 및 방향전환을 제어하는 컨트롤밸브;A control valve installed in a flow path between the hydraulic pump and the actuator and controlling the start, stop and direction change of the actuator during switching; 상기 컨트롤밸브로부터 유압탱크로 귀환되는 작동유를 냉각시키는 오일쿨러가 설치되고, 상기 오일쿨러 상류측에 제1체크밸브가 설치되는 제1리턴라인;An oil cooler for cooling hydraulic oil returned from the control valve to the hydraulic tank, and a first return line having a first check valve installed upstream of the oil cooler; 상기 제1리턴라인에 분기접속되고, 컨트롤러로부터 귀환되는 작동유를 오일쿨러를 경유하지않고 유압탱크로 귀환시키는 제2리턴라인; 및A second return line branched to the first return line and returning hydraulic oil returned from the controller to the hydraulic tank without passing through the oil cooler; And 상기 제1체크밸브와 오일쿨러 사이의 제1리턴라인에 설치되고, 상기 제1리턴라인을 따라 귀환되는 작동유의 온도에 따라 상기 오일쿨러로 배출되는 작동유 량을 조절하는 정온기를 포함하는 것을 특징으로 하는 정온기가 구비된 작동유 냉각시스템.And a thermostat installed on a first return line between the first check valve and the oil cooler and adjusting the amount of working oil discharged to the oil cooler according to the temperature of the working oil returned along the first return line. Hydraulic fluid cooling system equipped with a constant temperature. 제1항에 있어서, 상기 제2리턴라인에 설치되는 제2체크밸브를 포함하는 것을 특징으로 하는 정온기가 구비된 작동유 냉각시스템.The hydraulic fluid cooling system according to claim 1, further comprising a second check valve installed in the second return line.
KR1020090128848A 2009-12-22 2009-12-22 Cooling system of hydraulic oil having thermostat KR20110072072A (en)

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