WO2013123794A1 - 一种保压液压油箱 - Google Patents

一种保压液压油箱 Download PDF

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Publication number
WO2013123794A1
WO2013123794A1 PCT/CN2012/085822 CN2012085822W WO2013123794A1 WO 2013123794 A1 WO2013123794 A1 WO 2013123794A1 CN 2012085822 W CN2012085822 W CN 2012085822W WO 2013123794 A1 WO2013123794 A1 WO 2013123794A1
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WIPO (PCT)
Prior art keywords
valve
pressure
tank
hydraulic oil
oil tank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2012/085822
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English (en)
French (fr)
Inventor
张军
胡孝新
沈亮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan Sany Intelligent Control Equipment Co Ltd
Sany Heavy Machinery Ltd
Original Assignee
Hunan Sany Intelligent Control Equipment Co Ltd
Sany Heavy Machinery Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hunan Sany Intelligent Control Equipment Co Ltd, Sany Heavy Machinery Ltd filed Critical Hunan Sany Intelligent Control Equipment Co Ltd
Publication of WO2013123794A1 publication Critical patent/WO2013123794A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/18—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on either side
    • F16K17/19—Equalising valves predominantly for tanks
    • F16K17/196—Equalising valves predominantly for tanks spring-loaded
    • 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
    • F15B1/265—Supply reservoir or sump assemblies with pressurised main reservoir

Definitions

  • the utility model relates to the technical field of exhaust gas suction of a hydraulic oil tank, in particular to a pressure-maintaining hydraulic oil tank applied to a hydraulic excavator. Background technique
  • the hydraulic oil tank used by the excavator is provided with a breathing valve that vents outward and inhales.
  • a breathing valve that vents outward and inhales.
  • the hydraulic oil returns to the hydraulic tank, and the gas in the hydraulic tank passes.
  • the breathing valve is discharged outward.
  • the cylinder on the working device is extended, the hydraulic oil enters the cylinder from the hydraulic oil tank, and the breathing valve inhales from the outside to the hydraulic oil tank.
  • auxiliary breathing and suction are set in the breathing valve. Gas spring. As shown in Fig. 1, an exhaust gas breathing valve 1 is arranged above the hydraulic oil tank 0.
  • the purpose of the utility model is to provide a new pressure-maintaining hydraulic oil tank, which can effectively avoid oil and gas
  • Replacement page (Article 26) Squeeze out the surface of the contaminated tank and air into the tank to contaminate the hydraulic fluid.
  • a pressure-maintaining hydraulic oil tank includes a tank body, a filter core assembly is disposed in the tank body, a breathing valve is disposed at a top of the tank body, the breathing valve includes a valve body, and the valve body has a hollow cavity body, a valve seat is disposed at a bottom of the valve body, a valve stem is passed through the hollow body, and a filter element is further disposed on the valve body, the filter element is disposed through a hole provided in the inner wall of the hollow cavity a hollow body is connected to the valve body; an exhaust spring is disposed on the valve stem, and an air inlet spring is disposed on the valve seat, wherein the breathing valve is a non-exhaust breathing valve.
  • the opening pressure of the exhaust spring is greater than the maximum internal pressure of the hydraulic tank.
  • the filter cartridge assembly includes an oil absorbing filter cartridge assembly and a return oil filter cartridge assembly.
  • the filter element has a circular ring shape and is sleeved on the valve body.
  • the opening pressure of the exhaust spring is 0.05 MPa.
  • the utility model isolates the oil tank from the outside atmosphere, does not exchange air, avoids the oil gas from being discharged outward and the air entering the fuel tank to pollute the hydraulic oil, and is convenient to use and practical.
  • FIG. 1 is a schematic structural view of a hydraulic oil tank in the related art
  • FIG. 2 is a schematic structural view of a pressure maintaining hydraulic oil tank provided by an embodiment of the present invention
  • FIG. 3 is a schematic structural view of a breathing valve in the pressure maintaining hydraulic oil tank shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
  • the pressure-holding hydraulic oil tank of the embodiment of the present invention comprises a box body 2, wherein a common filter element assembly (not shown in the figure) is disposed in the box body 2, and the filter element assembly includes an oil-absorbing filter element. Assembly and return filter assembly.
  • a breathing valve 1 is provided at the top of the casing 2.
  • valve body 11 has a hollow body 15 , the bottom of the valve body 11 is provided with a valve seat 12 , the valve stem 13 passes through the hollow cavity 15 , and the valve body 11 is further provided with a filter core 14 , the filter core 14
  • the hole 16 is communicated with the hollow body 15 through a hole 16 provided in the inner wall of the hollow body 15; specifically, the filter element 14 has a circular ring shape and is sleeved on the valve body 11.
  • the valve stem 13 is sleeved with an exhaust spring 17, and the valve seat 12 is provided with an air spring 18, wherein the breathing valve 1 is a non-exhaust breathing valve, and the selected exhaust spring 17
  • the opening pressure is greater than the maximum internal pressure of the pressure-holding hydraulic oil tank, that is, the internal pressure of the fuel tank when the maximum oil return amount of the system is greater.
  • the adjustment of the opening pressure can be realized by changing the stiffness of the spring.
  • the opening pressure of the exhaust spring 17 is a larger value (greater than the opening pressure of the prior art), for example, 0.05 MPa (the opening pressure in the prior art is 0.01 MPa).
  • the working principle is that when the cylinder is retracted and the hydraulic oil returns to the tank, since the exhaust opening pressure of the breathing valve 1 is higher than the internal pressure of the tank, the tank cannot be exhausted outward, the volume of the gas is compressed, the pressure is increased, and the oil and gas are prevented from being outward.
  • the cylinder is extended and the hydraulic oil enters the cylinder, the volume of the gas in the tank increases, the pressure decreases, and the internal pressure of the tank stored when returning to the oil is released, without the need to replenish through the external atmosphere, thereby preventing the hydraulic oil from being contaminated.
  • the pressure-holding hydraulic oil tank of the embodiment of the present invention can be isolated from the outside atmosphere without air exchange, and the oil gas is prevented from being sprayed out of the surface of the fuel tank and the air entering the fuel tank to pollute the liquid pressure oil, which is convenient to use and practical.
  • the utility model provides a pressure-maintaining hydraulic oil tank, which can prevent the oil and gas from being sprayed out of the surface of the contaminated oil tank and the air entering the oil tank to contaminate the hydraulic oil. Therefore, the utility model has industrial applicability.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Self-Closing Valves And Venting Or Aerating Valves (AREA)
  • Safety Valves (AREA)

Abstract

一种保压液压油箱，包括箱体（2），箱体（2）内设有滤芯总成，在箱体（2）顶部设有呼吸阀（1），呼吸阀（1）包括阀体（11），阀体（11）具有中空腔体（15），底部设有阀座（12），阀杆（13）从中空腔体（15）中穿过，在阀体（11）上还设有滤芯（14），滤芯（14）通过设于中空腔体（15）内壁上的孔道与中空腔体（15）连通；在中空腔体（15）内、阀杆（13）上套有排气弹簧（17），在阀座（12）上设有进气弹簧（18），其中，呼吸阀（1）为不排气呼吸阀，选取的排气弹簧满足使得排气弹簧（17）的开启压力高于液压油箱最大内压的要求。该油箱与外界大气隔绝，不发生空气交换，避免了油气向外喷出及空气进入油箱污染液压油，使用方便。

Description

一种保压液压油箱 本申请要求于 2012 年 2 月 23 曰提交中国专利局、 申请号为 201220059951.2、 发明名称为"一种保压液压油箱"的中国专利申请的优先 权， 其全部内容通过引用结合在本申请中。 技术领域
本实用新型涉及液压油箱排气吸气技术领域， 尤其是一种应用于液压 挖掘机的保压液压油箱。 背景技术
目前挖掘机所使用的液压油箱均设置了向外排气及向里吸气的呼吸 阀， 当工作装置上的油缸收回的时^ ί矣， 液压油回到液压油箱， 液压油箱内 的气体通过呼吸阀向外排出， 当工作装置上的油缸伸出的时候， 液压油从 液压油箱进入油缸， 此时呼吸阀从外界向液压油箱内吸气， 另外， 呼吸阀 内设置了辅助排气及吸气的弹簧。 如图 1 所示， 在液压油箱 0上方设置有 排气呼吸阀 1 , 当油缸伸出、 液压油进入油缸时， 油箱 0内液压油减少， 油 箱 0内形成负压， 呼吸阀 1进气弹簧开启， 空气进入油箱 0; 当油缸收回、 液压油回到油箱 0时， 呼吸阀 1排气弹簧开启， 油气向外喷出， 读技术方 案所存在的问题是： 由于挖掘机工作时油温升高， 当气体通过呼吸阀 1 排 出油箱 0时， 一般会将油气一起排出， 喷洒在油箱 0表面， 造成污染， 并 给用户造成呼吸阀 1损坏漏油的假象； 而当呼吸阀 1 向内吸气时， 一般会 将空气中的杂质带入油箱 0， 造成液压油的污染。 实用新型内容
本实用新型的目的是提供一种新型保压液压油箱， 可以有效避免油气
替换页 （细则第 26条) 向外喷出污染油箱表面以及空气进入油箱污染液压油。
本实用新型解决其技术问题所采用的技术方案是：
一种保压液压油箱， 包括箱体， 箱体内设有滤芯总成， 在所述箱体顶 部设有呼吸阀， 所述呼吸阀包括阀体， 所述阀体具有中空腔体， 所述阀体 的底部设有阀座， 阀杆从所述中空腔体中穿过， 在所述阀体上还设有滤芯， 所述滤芯通过设于所述中空腔体内壁上的孔道与所述中空腔体连通； 在所 述中空腔体内、 所述阀杆上套设有排气弹簧， 在所述阀座上设有进气弹簧， 其中， 所述呼吸阀为不排气呼吸阀， 所述排气弹簧的开启压力大于所述液 压油箱最大内压的要求。
进一步地， 所述滤芯总成包括吸油滤芯总成和回油滤芯总成。
进一步地， 所述滤芯为圓环体形， 套设在所述阀体上。
进一步地， 所述排气弹簧的开启压力为 0.05MPa。
本实用新型使得油箱与外界大气隔绝， 不发生空气交换， 避免了油气 向外喷出及空气进入油箱污染液压油， 使用方便， 具有实用性。 附图说明
图 1是相关技术中的液压油箱的结构示意图；
图 2是本实用新型实施例提供的一种保压液压油箱的结构示意图； 图 3是图 2所示保压液压油箱中呼吸阀的结构示意图。 具体实施方式 下面结合附图和具体实施例对本实用新型作进一步说明， 但不作为本 实用新型的限定。
请参看图 2和图 3所示，本实用新型实施例的保压液压油箱包括箱体 2, 箱体 2内设有常见的滤芯总成（未在图中标出）， 滤芯总成包括吸油滤芯总 成和回油滤芯总成。 在箱体 2顶部设有呼吸阀 1。 见图 3所示， 呼吸阀 1包 括阀体 11 , 阀体 11具有中空腔体 15, 阀体 11的底部设有阀座 12, 阀杆 13 从中空腔体 15中穿过， 在阀体 11上还设有滤芯 14, 滤芯 14通过设于中空 腔体 15内壁上的孔道 16与中空腔体 15连通； 具体地， 滤芯 14为圓环体 形， 套设在阀体 11上。 在中空腔体 15内、 阀杆 13上套设有排气弹簧 17, 在阀座 12上设有进气弹簧 18, 其中， 呼吸阀 1为不排气呼吸阀， 选取的排 气弹簧 17的开启压力大于保压液压油箱的最大内压， 即大于系统最大回油 量时的油箱内压， 具体实施例时， 可通过改变弹簧的刚度实现该开启压力 的调整。 此处， 具体实施时， 排气弹簧 17的开启压力采用较大值（大于现 有技术的开启压力）， 例如为 0.05Mpa (现有技术中开启压力为 0.01MPa )。 工作原理是， 当油缸收回、 液压油回到油箱时， 由于呼吸阀 1 的排气开启 压力高于油箱内压， 油箱无法向外排气， 气体体积被压缩， 压力升高， 避 免油气向外喷出； 当油缸伸出、 液压油进入油缸时， 油箱内气体体积增大， 压力减小， 回油时储存的油箱内压被释放， 无需通过外界大气补充， 进而 避免液压油受到污染。
综上， 本实用新型实施例的保压液压油箱能够与外界大气隔绝， 不发 生空气交换， 避免了油气向外喷出污染油箱表面以及空气进入油箱污染液 压油， 使用方便， 具有实用性。
以上所述仅为本实用新型较佳的实施例， 并非因此限制本实用新型的 申请专利范围， 所以凡运用本实用新型说明书及图示内容所作出的等效结 构变化， 均包含在本实用新型的保护范围内。
工业实用性
本实用新型提供的一种保压液压油箱， 能够避免油气向外喷出污染油 箱表面以及空气进入油箱污染液压油。 因此， 本实用新型具有工业实用性。

Claims

权利要求书
1、 一种保压液压油箱， 其特征在于， 包括箱体， 箱体内设有滤芯总成， 在所述箱体顶部设有呼吸阀， 所述呼吸阀包括阀体， 所述阀体具有中空腔 体， 所述阀体的底部设有阀座， 阀杆从所述中空腔体中穿过， 在所述阀体 上还设有滤芯， 所述滤芯通过设于所述中空腔体内壁上的孔道与所述中空 腔体连通； 在所述中空腔体内、 所述阀杆上套设有排气弹簧， 在所述阀座 上设有进气弹簧， 所述呼吸阀为不排气呼吸阀， 所述排气弹簧的开启压力 大于所述液压油箱最大内压。
2、 如权利要求 1所述的保压液压油箱， 其特征在于， 所述滤芯总成包 括吸油滤芯总成和回油滤芯总成。
3、 如权利要求 1或 2所述的保压液压油箱， 其特征在于， 所述滤芯为 圓环体形， 套设在所述阀体上。
4、 如权利要求 1所述的保压液压油箱， 其特征在于， 所述排气弹簧的 开启压力为 0.05MPa。
PCT/CN2012/085822 2012-02-23 2012-12-04 一种保压液压油箱 Ceased WO2013123794A1 (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109026908A (zh) * 2018-08-31 2018-12-18 浙江车夫建筑装饰工程有限公司 一种市政工程用液压站
CN110886727A (zh) * 2019-12-16 2020-03-17 三一重机有限公司 可调呼吸装置、液压油箱及工程机械

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* Cited by examiner, † Cited by third party
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CN202520671U (zh) * 2012-02-23 2012-11-07 三一重机有限公司 一种保压液压油箱
CN103334989A (zh) * 2013-07-08 2013-10-02 三一矿机有限公司 一种液压油箱内部压力控制系统及矿用自卸车
DE102015221508A1 (de) * 2015-11-03 2017-05-04 Mahle Industriefiltration Gmbh Druckausgleichseinrichtung

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CN2413112Y (zh) * 2000-03-21 2001-01-03 昌河飞机工业（集团）有限责任公司 油箱呼吸盖
JP2004360769A (ja) * 2003-06-03 2004-12-24 Toyota Industries Corp フォークリフト用作動油タンクのブリーザ装置
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109026908A (zh) * 2018-08-31 2018-12-18 浙江车夫建筑装饰工程有限公司 一种市政工程用液压站
CN109026908B (zh) * 2018-08-31 2022-02-08 浙江车夫建筑装饰工程有限公司 一种市政工程用液压站
CN110886727A (zh) * 2019-12-16 2020-03-17 三一重机有限公司 可调呼吸装置、液压油箱及工程机械

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