CN104633233A - Overflow valve with magneto-rheological pilot valve - Google Patents
Overflow valve with magneto-rheological pilot valve Download PDFInfo
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- CN104633233A CN104633233A CN201510071719.9A CN201510071719A CN104633233A CN 104633233 A CN104633233 A CN 104633233A CN 201510071719 A CN201510071719 A CN 201510071719A CN 104633233 A CN104633233 A CN 104633233A
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- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0644—One-way valve
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- 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
- F16K17/20—Excess-flow valves
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Abstract
一种使用磁流变先导阀的溢流阀，包括溢流阀阀座、溢流阀上盖板、主阀阀芯、溢流阀阀体、主阀芯弹簧，磁流变先导阀锥阀、磁流变先导阀盖板、磁流变先导阀阀体、磁流变先导阀活塞、电磁线圈、单向阀片、过流板、调压弹簧、调压块及调压螺杆；所述溢流阀上盖板、磁流变先导阀前盖板、磁流变先导阀阀体安装于溢流阀阀座上；磁流变先导阀锥阀的阀杆穿过溢流阀上盖板，安装进入磁流变先导阀阀体内，并与磁流变先导阀活塞紧密连接；磁流变先导阀活塞、磁流变先导阀阀体、电磁线圈间形成工作间隙使磁流变液体流动；过流板与磁流变先导阀锥阀的阀杆间形成空间，单向阀片可以在该空间内弹性变形；旋转调压螺杆即可推动其前端的调压块压缩或释放调压弹簧。
A relief valve using a magneto-rheological pilot valve, comprising a relief valve seat, a relief valve upper cover, a main valve core, a relief valve body, a main valve core spring, and a magneto-rheological pilot valve cone valve , magnetorheological pilot valve cover plate, magnetorheological pilot valve body, magnetorheological pilot valve piston, electromagnetic coil, one-way valve plate, overflow plate, pressure regulating spring, pressure regulating block and pressure regulating screw; The upper cover plate of the overflow valve, the front cover plate of the magneto-rheological pilot valve, and the valve body of the magneto-rheological pilot valve are installed on the valve seat of the overflow valve; the valve stem of the poppet valve of the magneto-rheological pilot valve passes through the upper cover plate of the overflow valve , installed into the magnetorheological pilot valve body, and closely connected with the magnetorheological pilot valve piston; the magnetorheological pilot valve piston, the magnetorheological pilot valve body, and the electromagnetic coil form a working gap to make the magnetorheological fluid flow; A space is formed between the overflow plate and the stem of the magneto-rheological pilot valve poppet valve, and the one-way valve plate can be elastically deformed in this space; the pressure-regulating screw at the front can be pushed to compress or release the pressure-regulating spring by rotating the pressure-regulating screw.
Description
技术领域technical field
本发明涉及一种使用磁流变先导阀的溢流阀，属于液压传动技术领域。The invention relates to an overflow valve using a magneto-rheological pilot valve, which belongs to the technical field of hydraulic transmission.
技术背景technical background
溢流阀是液压传动系统中广泛应用的一种压力控制阀，主要功能是调节液压系统工作压力，其结构有直动式和先导式，先导式溢流阀适用于回路压力较高的系统。溢流阀的开启压力是通过旋转先导阀阀芯后方的螺杆，调节先导阀弹簧预紧力来实现的。其特点是调节方便、灵活，但压力控制范围有限、且无法实现压力实时调控及调节的自动化、程序化和智能化。磁流变液体是一种粘度可控的“智能材料”，常态下不能够承受剪切力，即很小的剪切力就可以使其流动；但是处于磁场环境中时，其能够承受一定的剪切应力，当作用在液体上的剪切力小于其屈服应力时，磁流变液体不会流动，仅产生弹性变形，只有当剪切力大于屈服应力时液体才会流动。磁流变液体的“智能”性表现在，其粘度和剪切屈服应力是随所处的磁场强度变化的，磁场强度越大，其粘度和剪切屈服应力也随之增大。目前基于磁流变技术的液压阀普遍存在两方面的不足，其一是应用磁流变液体作为工作介质，而磁流变液体由液态连续相和固体颗粒分散相组成，粘度大、易发热、成本高，所以不适宜大量用作液压传动的工作介质；其二，磁流变阀中仅包括一处工作间隙，阀动作时磁流变液体粘度增大，在间隙内流过时会承受较大的粘性阻力从而调节先导阀芯开启压力，但当阀处于复位行程时，液体依然处于磁场中而保持高粘度，这使得复位行程也承受大的粘性阻力，会导致阀门不能及时复位或者复位动作滞后明显，增加了液压阀的响应时间。Relief valve is a kind of pressure control valve widely used in hydraulic transmission system. Its main function is to adjust the working pressure of hydraulic system. Its structure includes direct acting type and pilot type. Pilot type relief valve is suitable for systems with high circuit pressure. The opening pressure of the relief valve is achieved by adjusting the preload of the pilot valve spring by rotating the screw behind the pilot valve spool. It is characterized by convenient and flexible adjustment, but the pressure control range is limited, and it is impossible to realize real-time pressure adjustment and automatic, programmed and intelligent adjustment. Magneto-rheological fluid is a kind of "smart material" with controllable viscosity. Under normal conditions, it cannot withstand shear force, that is, it can flow with a small shear force; but when it is in a magnetic field environment, it can withstand a certain Shear stress, when the shear force acting on the liquid is less than its yield stress, the magnetorheological fluid will not flow, only elastic deformation will occur, and the liquid will flow only when the shear force is greater than the yield stress. The "intelligence" of magnetorheological fluid is that its viscosity and shear yield stress change with the intensity of the magnetic field. The greater the magnetic field intensity, the greater the viscosity and shear yield stress. At present, hydraulic valves based on magnetorheological technology generally have two deficiencies. One is the use of magnetorheological fluid as the working medium, and magnetorheological fluid is composed of a liquid continuous phase and a solid particle dispersed phase. The cost is high, so it is not suitable to be used in large quantities as the working medium of hydraulic transmission; second, the magnetorheological valve only includes one working gap, and the viscosity of the magnetorheological fluid increases when the valve operates, and it will bear a large amount of pressure when flowing through the gap. Viscous resistance to adjust the opening pressure of the pilot spool, but when the valve is in the reset stroke, the liquid is still in the magnetic field and maintains high viscosity, which makes the reset stroke also bear large viscous resistance, which will cause the valve to fail to reset in time or the reset action to lag Obviously, the response time of the hydraulic valve is increased.
发明内容Contents of the invention
本发明所要解决的主要技术问题是提供一种应用普通液压油为工作介质的溢流阀，其采用磁流变液体为先导阀的工作介质，通过调节磁流变先导阀线圈中的电流强度和先导阀弹簧的预紧力来控制溢流阀开启压力，实现调控实时化、自动化、智能化和增大压力调节范围的目的，同时具有响应动作迅速的特点。The main technical problem to be solved by the present invention is to provide a relief valve using ordinary hydraulic oil as the working medium, which uses magnetorheological fluid as the working medium of the pilot valve, and adjusts the current intensity and The pre-tightening force of the pilot valve spring is used to control the opening pressure of the relief valve, so as to realize the purpose of real-time regulation, automation, intelligence and increase the pressure regulation range, and has the characteristics of rapid response.
为了解决上述的技术问题，本发明提供了一种使用磁流变先导阀的溢流阀，包括溢流阀阀座1、溢流阀上盖板5、主阀阀芯2、溢流阀阀体3、主阀芯弹簧4，磁流变先导阀锥阀6、磁流变先导阀盖板7、磁流变先导阀阀体14，磁流变先导阀活塞8、电磁线圈9、单向阀片10、过流板11、调压弹簧12、调压块及调压螺杆13；In order to solve the above technical problems, the present invention provides a relief valve using a magneto-rheological pilot valve, comprising a relief valve seat 1, a relief valve upper cover 5, a main valve core 2, a relief valve Body 3, main spool spring 4, magnetorheological pilot valve cone valve 6, magnetorheological pilot valve cover plate 7, magnetorheological pilot valve body 14, magnetorheological pilot valve piston 8, electromagnetic coil 9, one-way Valve plate 10, overflow plate 11, pressure regulating spring 12, pressure regulating block and pressure regulating screw 13;
所述溢流阀上盖板5、磁流变先导阀前盖板7、磁流变先导阀阀体14安装于溢流阀阀座1上；磁流变先导阀锥阀6的阀杆穿过溢流阀上盖板5，安装进入磁流变先导阀阀体14内，并与磁流变先导阀活塞8紧密连接；磁流变先导阀活塞8、磁流变先导阀阀体14、电磁线圈9间形成工作间隙15使磁流变液体流动；磁流变先导阀活塞8、磁流变先导阀阀体14及电磁线圈9的铁芯为高导磁材料；过流板11与磁流变先导阀锥阀6的阀杆间形成空间，单向阀片10可以在该空间内弹性变形；旋转调压螺杆13即可推动其前端的调压块压缩或释放调压弹簧12。The upper cover plate 5 of the overflow valve, the front cover plate 7 of the magneto-rheological pilot valve, and the valve body 14 of the magneto-rheological pilot valve are installed on the valve seat 1 of the overflow valve; The upper cover plate 5 of the overflow valve is installed into the magnetorheological pilot valve body 14, and is closely connected with the magnetorheological pilot valve piston 8; the magnetorheological pilot valve piston 8, the magnetorheological pilot valve body 14, A working gap 15 is formed between the electromagnetic coils 9 to make the magnetorheological fluid flow; the magnetorheological pilot valve piston 8, the magnetorheological pilot valve body 14 and the iron core of the electromagnetic coil 9 are made of high magnetic permeability materials; the overflow plate 11 and the magnetic A space is formed between the stems of the poppet valve 6 of the rheological pilot valve, and the one-way valve plate 10 can elastically deform in the space; the pressure regulating screw 13 can be rotated to push the pressure regulating block at the front end to compress or release the pressure regulating spring 12 .
在一较佳实施例中：所述溢流阀内的工作介质为普通液压油，磁流变先导阀内的工作介质为磁流变液，磁流变液体容积在30-150ml。In a preferred embodiment: the working medium in the overflow valve is ordinary hydraulic oil, the working medium in the magneto-rheological pilot valve is magnetorheological fluid, and the volume of the magnetorheological fluid is 30-150ml.
在一较佳实施例中：所述工作间隙15的宽度为0.3-3mm，长度为6-60mm。In a preferred embodiment: the width of the working gap 15 is 0.3-3mm, and the length is 6-60mm.
在一较佳实施例中：所述磁流变先导阀活塞8靠近中心位置均布3-6个通流孔16，通流孔中心距离磁流变先导阀活塞8外圆表面径向距离大于5mm。In a preferred embodiment: the magneto-rheological pilot valve piston 8 is evenly distributed with 3-6 flow holes 16 near the center, and the radial distance from the center of the flow hole to the outer circular surface of the magneto-rheological pilot valve piston 8 is greater than 5mm.
在一较佳实施例中：所述磁流变先导阀活塞8与磁流变先导阀锥阀6相反方向处的端面安装所述单向阀片10和过流板11；所述单向阀片10由弹性材料制成，在过流板11与活塞8端面间的空间内产生弹性形变，封闭或开启通流孔16。In a preferred embodiment: the end face of the magneto-rheological pilot valve piston 8 in the opposite direction to the magneto-rheological pilot valve cone valve 6 is installed with the check valve plate 10 and the overflow plate 11; the check valve The sheet 10 is made of elastic material, and elastically deforms in the space between the flow plate 11 and the end surface of the piston 8 to close or open the flow hole 16 .
在一较佳实施例中：磁流变先导阀阀体14一侧安装所述调压弹簧12和调节调压弹簧12预紧力的压块和调压螺杆13。In a preferred embodiment: the valve body 14 of the magneto-rheological pilot valve is installed with the pressure regulating spring 12 , a pressure block and a pressure regulating screw 13 for adjusting the pretightening force of the pressure regulating spring 12 .
在一较佳实施例中：所述溢流阀工作压力调节范围为1-40MPa，最大流量为3000L/min。In a preferred embodiment: the operating pressure adjustment range of the relief valve is 1-40MPa, and the maximum flow rate is 3000L/min.
相较于现有技术，本发明的技术方案具备以下有益效果：Compared with the prior art, the technical solution of the present invention has the following beneficial effects:
1.将先导式溢流阀与磁流变先导阀结合，使磁流变阀应用于普通液压油为工作介质的液压传动系统，增强了液压系统的工作能力，也扩大了磁流变阀的应用范围。1. Combining the pilot-operated relief valve with the magneto-rheological pilot valve, the magneto-rheological valve is applied to the hydraulic transmission system with ordinary hydraulic oil as the working medium, which enhances the working capacity of the hydraulic system and expands the scope of the magneto-rheological valve. application range.
2.磁流变先导阀采用电流信号控制，实现了溢流阀工作压力的自动化、智能化和实时化控制；2. The magneto-rheological pilot valve adopts current signal control, which realizes the automatic, intelligent and real-time control of the working pressure of the relief valve;
3.磁流变先导阀内部增加通流孔，使得先导阀芯开启时受产生磁流变效应的磁流变液体粘性力控制，而当先导阀芯复位时，磁流变液体经通流孔流动，处于磁流变效应影响区外，因此磁流变液体的流动性并未降低，复位动作响应迅速、灵敏。3. A flow hole is added inside the magneto-rheological pilot valve, so that when the pilot valve core is opened, it is controlled by the viscous force of the magneto-rheological fluid that produces the magneto-rheological effect, and when the pilot valve core is reset, the magneto-rheological fluid passes through the flow hole The flow is outside the area affected by the magnetorheological effect, so the fluidity of the magnetorheological fluid is not reduced, and the reset action responds quickly and sensitively.
4.调压螺杆与电磁线圈共同调节控制压力，增大了调压范围。4. The pressure regulating screw and the electromagnetic coil jointly adjust the control pressure, which increases the pressure regulating range.
附图说明Description of drawings
图1为本发明优选实施中溢流阀的结构示意图。Fig. 1 is a structural schematic diagram of a relief valve in a preferred implementation of the present invention.
具体实施方式Detailed ways
下文结合附图和具体实施方式对本发明做进一步说明。The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
参考图1，一种使用磁流变先导阀的溢流阀，溢流阀内的工作介质为普通液压油，溢流阀工作压力调节范围为1-40MPa，最大流量为3000L/min，磁流变先导阀内的工作介质为磁流变液，磁流变液体容积在30-150ml。Referring to Figure 1, a relief valve using a magneto-rheological pilot valve. The working medium in the relief valve is ordinary hydraulic oil. The working medium in the variable pilot valve is magnetorheological fluid, and the volume of the magnetorheological fluid is 30-150ml.
所述一种使用磁流变先导阀的溢流阀包括溢流阀阀体1、溢流阀上盖板5、主阀阀芯2、主阀芯弹簧3、磁流变先导阀锥阀6，磁流变先导阀前盖板7、磁流变先导阀阀体14，磁流变先导阀活塞8、电磁线圈9，调压弹簧12、调压块及调压螺杆13。The overflow valve using a magnetorheological pilot valve includes a relief valve body 1, an upper cover plate 5 of the overflow valve, a main valve core 2, a main valve core spring 3, and a magnetorheological pilot valve cone valve 6 , Magnetorheological pilot valve front cover 7, magnetorheological pilot valve body 14, magnetorheological pilot valve piston 8, electromagnetic coil 9, pressure regulating spring 12, pressure regulating block and pressure regulating screw 13.
溢流阀上盖板5、磁流变先导阀前盖板7、磁流变先导阀阀体14安装于溢流阀阀座1上。磁流变先导阀锥阀6的阀杆穿过溢流阀上盖板5，安装进入磁流变先导阀阀体14内，并与磁流变先导阀活塞8紧密连接。磁流变先导阀活塞8、磁流变先导阀阀体14、电磁线圈9间形成工作间隙15使磁流变液体流动，所述工作间隙15的宽度为0.3-3mm，长度为6-60mm。磁流变先导阀活塞8与磁流变先导阀阀体14及电磁线圈9的铁芯为高导磁材料。The upper cover plate 5 of the overflow valve, the front cover plate 7 of the magneto-rheological pilot valve, and the valve body 14 of the magneto-rheological pilot valve are installed on the valve seat 1 of the overflow valve. The valve rod of the poppet valve 6 of the magneto-rheological pilot valve passes through the upper cover plate 5 of the overflow valve, is installed into the valve body 14 of the magneto-rheological pilot valve, and is closely connected with the piston 8 of the magneto-rheological pilot valve. The magnetorheological pilot valve piston 8, the magnetorheological pilot valve body 14, and the electromagnetic coil 9 form a working gap 15 to make the magnetorheological fluid flow. The working gap 15 has a width of 0.3-3mm and a length of 6-60mm. The iron cores of the magneto-rheological pilot valve piston 8 , the magneto-rheological pilot valve body 14 and the electromagnetic coil 9 are high magnetic permeability materials.
磁流变先导阀活塞8靠近中心位置均布3-6个通流孔16，通流孔16中心距离磁流变先导阀活塞8外圆表面径向距离大于5mm。磁流变先导阀活塞8与磁流变先导阀锥阀6相反方向处的端面安装有单向阀片10和过流板11，单向阀片10由弹性材料制成，可以在过流板11与活塞8端面间的空间内产生弹性变形，封闭或开启通流孔16。The magnetorheological pilot valve piston 8 is evenly distributed with 3-6 flow holes 16 near the center, and the radial distance between the center of the flow holes 16 and the outer circular surface of the magnetorheological pilot valve piston 8 is greater than 5mm. The end face of the magneto-rheological pilot valve piston 8 in the opposite direction to the magneto-rheological pilot valve cone valve 6 is equipped with a one-way valve plate 10 and an overflow plate 11. The one-way valve plate 10 is made of elastic material and can be placed on the overflow plate. Elastic deformation occurs in the space between 11 and the end surface of piston 8, and the flow hole 16 is closed or opened.
磁流变先导阀阀体14一侧有调压弹簧12和调节调压弹簧12预紧力的压块及螺杆组件13。旋转调压螺杆13即可推动其前端的调压块压缩或释放调压弹簧12。On one side of the magneto-rheological pilot valve body 14 there is a pressure-regulating spring 12 and a pressure block and a screw assembly 13 for adjusting the pretightening force of the pressure-regulating spring 12 . Rotating the pressure regulating screw 13 can push the pressure regulating block at its front end to compress or release the pressure regulating spring 12 .
工作时，液压油由溢流阀进油口进入溢流阀阀座1，并经由阻尼孔进入溢流阀上盖板5中磁流变先导阀锥阀6的左腔。当液压系统的压力小于先导阀锥阀6右侧的磁流变液体剪切屈服应力和调压弹簧12弹性力之和时，先导阀锥阀6不会开启。当系统液压力大于先导阀锥阀6右侧的磁流变液体剪切屈服应力和调压弹簧12弹性力之和时，先导阀锥阀6带动磁流变先导阀活塞8共同向右移动，同时磁流变液体自磁流变先导阀活塞8后腔通过工作间隙15向前腔流动，磁流变先导阀锥阀6开启。主阀阀芯2内液压油从磁流变先导阀锥阀6后的通道口接通油箱，此时主阀阀芯2上下两腔形成压力差。当主阀阀芯2上的压力差能够平衡主阀芯弹簧4的弹力时，主阀阀芯2向上开启，溢流阀出口打开，液压油从进油口流入并通过出油口流出。When working, the hydraulic oil enters the valve seat 1 of the relief valve from the oil inlet of the relief valve, and enters the left cavity of the poppet valve 6 of the magneto-rheological pilot valve in the upper cover plate 5 of the relief valve through the damping hole. When the pressure of the hydraulic system is less than the sum of the shear yield stress of the magneto-rheological fluid on the right side of the pilot valve poppet valve 6 and the elastic force of the pressure regulating spring 12, the pilot valve poppet valve 6 will not open. When the system hydraulic pressure is greater than the sum of the shear yield stress of the magneto-rheological fluid on the right side of the pilot valve cone valve 6 and the elastic force of the pressure regulating spring 12, the pilot valve cone valve 6 drives the magneto-rheological pilot valve piston 8 to move to the right together, At the same time, the magnetorheological fluid flows from the rear cavity of the magnetorheological pilot valve piston 8 through the working gap 15 to the front cavity, and the magnetorheological pilot valve cone valve 6 is opened. The hydraulic oil in the main valve spool 2 is connected to the oil tank through the channel port behind the poppet valve 6 of the magneto-rheological pilot valve. At this time, the upper and lower cavities of the main valve spool 2 form a pressure difference. When the pressure difference on the main valve spool 2 can balance the elastic force of the main spool spring 4, the main valve spool 2 opens upwards, the relief valve outlet opens, and the hydraulic oil flows in from the oil inlet and flows out through the oil outlet.
磁流变先导阀锥阀6开启运动时，磁流变液体的压力通过过流板11上的孔作用于单向阀片10的右侧面，使其弹性变形而贴紧磁流变先导阀活塞的右端面，从而封闭磁流变先导阀活塞8上的通流孔16，因此磁流变液体只能通过工作间隙15流动，而工作间隙15处于电磁线圈9产生的磁力线影响范围内，只有磁流变先导阀锥阀6进口处的液压力能够克服磁流变液屈服前的粘性力和调压弹簧12弹力时，磁流变液才会流动，磁流变先导阀锥阀6才能够开启。调节线圈中电流强度，能够改变磁流变液的剪切屈服应力，即其产生流动所需的力，也就可以调节溢流阀的开启压力。When the poppet valve 6 of the magneto-rheological pilot valve opens and moves, the pressure of the magnetorheological fluid acts on the right side of the one-way valve plate 10 through the hole on the overflow plate 11, making it elastically deformed and close to the magnetorheological pilot valve The right end face of the piston, thereby closing the flow hole 16 on the piston 8 of the magnetorheological pilot valve, so the magnetorheological fluid can only flow through the working gap 15, and the working gap 15 is within the influence range of the magnetic field lines generated by the electromagnetic coil 9, only Only when the hydraulic pressure at the inlet of the magnetorheological pilot valve cone valve 6 can overcome the viscous force of the magnetorheological fluid before yielding and the elastic force of the pressure regulating spring 12 can the magnetorheological fluid flow, and the magnetorheological pilot valve cone valve 6 can open. Adjusting the current intensity in the coil can change the shear yield stress of the magnetorheological fluid, that is, the force required to generate flow, and also adjust the opening pressure of the overflow valve.
液压系统工作压力下降，低于溢流阀开启压力时，磁流变先导阀活塞8左侧的力小于右侧的力，调压弹簧12将磁流变先导阀活塞8向前推，磁流变先导阀活塞8前腔的磁流变液压力通过通流孔16作用于单向阀片10的左侧面，单向阀片10恢复弹性变形前的形状，打开通流孔16。而通流孔16距离电磁线圈9距离较大，受磁力线影响微弱，因此通流孔16内磁流变液体粘度低易于流动，因此可以迅速流至磁流变先导阀活塞8后腔，使磁流变先导阀锥阀6复位。When the working pressure of the hydraulic system drops below the opening pressure of the relief valve, the force on the left side of the magneto-rheological pilot valve piston 8 is smaller than the force on the right side, and the pressure-regulating spring 12 pushes the magneto-rheological pilot valve piston 8 forward, and the magneto-rheological pilot valve piston 8 is pushed forward. The magneto-rheological fluid pressure in the front cavity of the variable pilot valve piston 8 acts on the left side of the one-way valve plate 10 through the flow hole 16 , and the one-way valve plate 10 recovers the shape before elastic deformation, and the flow hole 16 is opened. And the flow hole 16 is far away from the electromagnetic coil 9, and is weakly affected by the magnetic field lines. Therefore, the magnetorheological liquid has a low viscosity and is easy to flow in the flow hole 16, so it can flow to the magnetorheological pilot valve piston 8 rear cavity quickly, so that the magneto-rheological liquid The rheological pilot valve poppet 6 resets.
电磁线圈9的电流强度的控制能够实现实时化和智能化，但磁流变先导阀内空间有限，所以电磁线圈匝数不宜过多，可以加载的电流强度通常在0-2.5A，所产生的磁流变液剪切应力即可在此范围内调节。为了增大溢流阀压力调节范围，在先导阀后部，加装了调整调压弹簧12预紧力的压块和调节螺杆13，向内旋紧螺杆，使得压块压缩调压弹簧12增大弹性力或向外释放螺杆减小调压弹簧12的弹性力，再结合磁流变液体粘性阻力的控制，就可以实现大范围、无级、连续的溢流阀压力控制。The control of the current intensity of the electromagnetic coil 9 can be real-time and intelligent, but the space in the magneto-rheological pilot valve is limited, so the number of turns of the electromagnetic coil should not be too many, and the current intensity that can be loaded is usually 0-2.5A. The shear stress of magnetorheological fluid can be adjusted within this range. In order to increase the pressure adjustment range of the relief valve, at the rear of the pilot valve, a pressure block for adjusting the preload of the pressure regulating spring 12 and an adjusting screw 13 are installed, and the screw is tightened inward, so that the pressure block compresses the pressure regulating spring 12 and increases. Large elastic force or outward release of the screw reduces the elastic force of the pressure regulating spring 12, combined with the control of the viscous resistance of the magneto-rheological fluid, a large-scale, stepless and continuous pressure control of the overflow valve can be realized.
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应该以权利要求的保护范围为准。The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.
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