CN106194876B - A kind of self-cleaning type constant flow control valve - Google Patents
A kind of self-cleaning type constant flow control valve Download PDFInfo
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- CN106194876B CN106194876B CN201610796707.7A CN201610796707A CN106194876B CN 106194876 B CN106194876 B CN 106194876B CN 201610796707 A CN201610796707 A CN 201610796707A CN 106194876 B CN106194876 B CN 106194876B
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- 238000004140 cleaning Methods 0.000 title claims abstract description 27
- 238000007789 sealing Methods 0.000 claims description 20
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 239000012535 impurity Substances 0.000 abstract description 11
- 239000003350 kerosene Substances 0.000 abstract description 7
- 238000013016 damping Methods 0.000 abstract description 5
- 238000001914 filtration Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
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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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/023—Excess flow valves, e.g. for locking cylinders in case of hose burst
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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
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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Abstract
一种自清洁型恒流量控制阀，结构上采用“高压过滤器+两级滑阀+低压过滤器”的配置方式；恒流量控制阀采用“导阀+主阀”的两级滑阀配置方式，并通过若干阻尼孔调节控制性能；在恒流量控制阀的入口配置高压过滤器，对引流的发动机高压煤油进行过滤，防止其中的杂质进入恒流量控制阀；在恒流量控制阀的出口配置低压过滤器，对流出恒流量控制阀流回发动机的低压煤油进行过滤，防止恒流量控制阀中产生的杂质污染发动机。本发明具有自清洁作用和恒定流量控制两个特点，适用于为需要恒定流量输出的负载提供清洁可靠的油液的应用场合。
A self-cleaning constant flow control valve, structurally adopts the configuration of "high pressure filter + two-stage spool valve + low pressure filter"; the constant flow control valve adopts the configuration of "pilot valve + main valve" two-stage spool valve , and adjust the control performance through a number of damping holes; configure a high-pressure filter at the inlet of the constant flow control valve to filter the high-pressure kerosene of the engine to prevent impurities from entering the constant flow control valve; configure a low pressure filter at the outlet of the constant flow control valve The filter is used to filter the low-pressure kerosene flowing out of the constant flow control valve and back to the engine, so as to prevent the impurities produced in the constant flow control valve from polluting the engine. The invention has two characteristics of self-cleaning function and constant flow control, and is suitable for the application occasion of providing clean and reliable oil for loads requiring constant flow output.
Description
技术领域technical field
本发明涉及一种自清洁型恒流量控制阀，属于流量控制阀门技术领域。The invention relates to a self-cleaning constant flow control valve, which belongs to the technical field of flow control valves.
背景技术Background technique
现有恒流量控制阀多采用由节流阀和定差减压阀构成的调速阀，其恒流量控制属于开环控制，其流量控制存在固有偏差；调速阀属于单级恒速阀，其流量一般较小；调速阀产品不集成高低压过滤器，因此没有自清洁功能。The existing constant flow control valve mostly adopts a speed regulating valve composed of a throttle valve and a differential pressure reducing valve. The constant flow control belongs to open-loop control, and its flow control has inherent deviation; The flow rate is generally small; the speed control valve product does not integrate high and low pressure filters, so it has no self-cleaning function.
发明内容Contents of the invention
本发明的技术解决问题是：克服现有技术的不足，提供了一种自清洁型恒流量控制阀，实现了大流量下的、流量闭环无差控制的、具有自清洁功能的恒流量控制功能。The technical problem of the present invention is: to overcome the deficiencies of the prior art, to provide a self-cleaning constant flow control valve, which realizes the constant flow control function with self-cleaning function under large flow rate, flow closed-loop control without difference .
本发明的技术解决方案是：Technical solution of the present invention is:
一种自清洁型恒流量控制阀，包括：低压过滤器、通油套、高压过滤器、高压过滤器壳体和恒流量控制阀主体；恒流量控制阀主体的进油口处装有高压过滤器壳体，高压过滤器设置在高压过滤器壳体内部，用于清洁输入的油液；A self-cleaning constant flow control valve, comprising: a low pressure filter, an oil sleeve, a high pressure filter, a high pressure filter housing and a constant flow control valve body; the oil inlet of the constant flow control valve body is equipped with a high pressure filter The filter housing, the high-pressure filter is set inside the high-pressure filter housing to clean the input oil;
恒流量控制阀主体的出油口和低压过滤器之间通过通油套进行连接和密封，低压过滤器用于清洁输出的油液；恒流量控制阀主体用于对流经其中的油液进行恒流量控制。The oil outlet of the main body of the constant flow control valve and the low-pressure filter are connected and sealed through the oil sleeve, and the low-pressure filter is used to clean the output oil; the main body of the constant flow control valve is used for constant flow of the oil flowing through it. control.
高压过滤器的进油口和低压过滤器的出油口朝向一致。The oil inlet of the high-pressure filter and the oil outlet of the low-pressure filter are in the same direction.
恒流量控制阀主体包括导阀、主阀、阀壳体、第一阻尼器、第二阻尼器、第三阻尼器、第一密封结构和第二密封结构；The main body of the constant flow control valve includes a pilot valve, a main valve, a valve housing, a first damper, a second damper, a third damper, a first sealing structure and a second sealing structure;
导阀、主阀和第一阻尼器均安装在阀壳体中，第一阻尼器位于导阀和主阀之间，用于调节主阀流量的超调量；第二阻尼器和第三阻尼器串联安装在阀壳体内，为导阀提供反馈压力，阀壳体内设置有低压腔和高压腔，作为恒流量控制阀主体与其负载的接口，分别实现由恒流量阀流向负载和由负载流回恒流量阀的连接；第一密封结构实现第一阻尼器油路的对外密封，第二密封结构实现第三阻尼器的对外密封。The pilot valve, the main valve and the first damper are all installed in the valve housing, and the first damper is located between the pilot valve and the main valve to adjust the overshoot of the flow of the main valve; the second damper and the third damper The device is installed in series in the valve housing to provide feedback pressure for the pilot valve. The valve housing is provided with a low-pressure chamber and a high-pressure chamber, which are used as the interface between the main body of the constant flow control valve and its load, respectively realizing the flow from the constant flow valve to the load and the flow back from the load. The connection of the constant flow valve; the first sealing structure realizes the external sealing of the oil circuit of the first damper, and the second sealing structure realizes the external sealing of the third damper.
所述导阀包括第一螺堵、限位块、导阀套、导阀芯、垫套、螺套、顶针、顶座、第一弹簧、第一弹簧座、调节螺套和锁紧螺母；The pilot valve includes a first screw plug, a limit block, a pilot valve sleeve, a pilot valve core, a gasket sleeve, a screw sleeve, a thimble, a top seat, a first spring, a first spring seat, an adjusting screw sleeve and a lock nut;
导阀套位于阀壳体内，第一螺堵安装在导阀套的一端，垫套安装在导阀套的另一端，螺套安装在垫套的外部，通过拧紧第一螺堵和螺套将导阀套固定在阀壳体上；导阀芯安装在导阀套内，其靠近第一螺堵的一端安装限位块，用于对导阀芯进行限位，其另一端通过垫套实现限位；The pilot valve sleeve is located in the valve housing, the first screw plug is installed at one end of the pilot valve sleeve, the gasket is installed at the other end of the pilot valve sleeve, and the screw sleeve is installed outside the gasket sleeve. By tightening the first screw plug and the screw sleeve, the The pilot valve sleeve is fixed on the valve housing; the pilot valve core is installed in the pilot valve sleeve, and a limit block is installed at one end close to the first screw plug to limit the position of the pilot valve core, and the other end is realized by a gasket. limit;
在导阀芯靠近垫套的一端安装有顶针、顶座、第一弹簧、第一弹簧座和调节螺套，顶针、顶座以及第一弹簧座配合，用于将第一弹簧的弹簧力传递给导阀芯；调节螺套与螺套之间是螺纹连接，通过调整调节螺套，改变第一弹簧的预压缩量，相应地改变预先设定的作用在导阀芯上的弹簧力的大小，从而调整恒流量控制阀目标流量的设定值。A thimble, a top seat, a first spring, a first spring seat and an adjusting screw sleeve are installed on the end of the pilot valve core close to the cushion sleeve, and the thimble, top seat and the first spring seat cooperate to transmit the spring force of the first spring To the pilot valve core; the threaded connection between the adjusting screw sleeve and the screw sleeve, by adjusting the adjusting screw sleeve, the pre-compression amount of the first spring is changed, and the preset spring force acting on the pilot valve core is correspondingly changed , so as to adjust the set value of the target flow of the constant flow control valve.
所述主阀包括第一螺座、第二弹簧座、第二弹簧、主阀套、主阀芯、第三弹簧、第三弹簧座和第二螺座；The main valve includes a first screw seat, a second spring seat, a second spring, a main valve sleeve, a main valve core, a third spring, a third spring seat and a second screw seat;
主阀套位于阀壳体内，主阀套一端安装第一螺座，另一端安装第二螺座，第一螺座和第二螺座将主阀套固定在阀壳体上；主阀芯安装在主阀套内，主阀芯靠近第一螺座的一端布置第二弹簧和第二弹簧座，主阀芯的另一端布置第三弹簧和第三弹簧座，第二弹簧座和第三弹簧座分别安装在第一螺座和第二螺座中，第二弹簧和第三弹簧用于实现主阀芯的复位，第三弹簧座用于为主阀芯限位，限定主阀的最小开度。The main valve sleeve is located in the valve housing. The first screw seat is installed at one end of the main valve sleeve, and the second screw seat is installed at the other end. The first screw seat and the second screw seat fix the main valve sleeve on the valve housing; the main valve core is installed In the main valve sleeve, the second spring and the second spring seat are arranged on the end of the main valve core close to the first screw seat, the third spring and the third spring seat are arranged on the other end of the main valve core, and the second spring seat and the third spring seat Seats are respectively installed in the first screw seat and the second screw seat, the second spring and the third spring are used to realize the reset of the main valve core, and the third spring seat is used to limit the position of the main valve core and limit the minimum opening of the main valve. Spend.
第二弹簧和第三弹簧的刚度相同。The stiffness of the second spring and the third spring are the same.
主阀的第一螺座与导阀的第一螺堵朝向相同。The first screw seat of the main valve is in the same direction as the first screw plug of the pilot valve.
导阀的两个输出口通过阀壳体上的流道分别连接到主阀芯的两侧，实现导阀对主阀的控制，从导阀输出口到主阀芯两侧的连接油路上，并联有第一阻尼器。The two output ports of the pilot valve are respectively connected to both sides of the main valve core through the flow passages on the valve housing to realize the control of the pilot valve to the main valve. From the output port of the pilot valve to the connecting oil circuit on both sides of the main valve core A first damper is connected in parallel.
在负载回油的低压腔和低压过滤器之间，在阀壳体上设置一个固定节流孔，将低压腔通过流道连接到第三阻尼器的外侧，第二阻尼器的内侧通过流道连接到低压过滤器的进油口；在第二阻尼器和第三阻尼器之间布置一个流道，连接到导阀芯的靠近第一螺堵的一侧。Between the low-pressure chamber of the load oil return and the low-pressure filter, a fixed orifice is set on the valve housing, and the low-pressure chamber is connected to the outside of the third damper through the flow channel, and the inside of the second damper is through the flow channel Connect to the oil inlet of the low-pressure filter; arrange a flow channel between the second damper and the third damper, and connect to the side of the pilot valve core close to the first screw plug.
本发明与现有技术相比的有益效果是：The beneficial effect of the present invention compared with prior art is:
1)本发明技术方案在恒流量控制阀进口集成了高压过滤器，有效防止上游油液中的杂质进入恒流量控制阀。1) The technical solution of the present invention integrates a high-pressure filter at the inlet of the constant flow control valve, which effectively prevents impurities in the upstream oil from entering the constant flow control valve.
2)本发明技术方案在恒流量控制阀出口集成了低压过滤器，有效防止恒流量阀及其负载内产生的杂质随油液进入下游。2) The technical solution of the present invention integrates a low-pressure filter at the outlet of the constant flow control valve, which effectively prevents impurities generated in the constant flow valve and its load from entering downstream with the oil.
3)本发明技术方案将高压过滤器嵌入阀壳体内部，高低压过滤器与恒流量阀高度集成，获得高度集成的自清洁功能。3) The technical solution of the present invention embeds the high-pressure filter inside the valve housing, and the high-low pressure filter is highly integrated with the constant flow valve to obtain a highly integrated self-cleaning function.
4)本发明技术方案利用两级滑阀实现恒流量控制，可以适应大流量控制的需求。4) The technical solution of the present invention utilizes a two-stage slide valve to realize constant flow control, which can meet the demand of large flow control.
5)本发明技术方案利用固定节流孔将被控流量转换为压力，并通过串联阻尼器将压力反馈至导阀，参与闭环控制，可以实现较高的流量控制精度。5) The technical solution of the present invention uses a fixed orifice to convert the controlled flow rate into pressure, and feeds the pressure back to the pilot valve through a series damper to participate in closed-loop control, which can achieve high flow control accuracy.
6)本发明技术方案将动压阻尼器并联在主阀芯两侧之间，调整动压阻尼器的阻尼孔大小可以调整流量的超调量。6) In the technical solution of the present invention, the dynamic pressure damper is connected in parallel between the two sides of the main valve core, and the overshoot of the flow rate can be adjusted by adjusting the size of the damping hole of the dynamic pressure damper.
附图说明Description of drawings
图1为本发明自清洁型恒流量控制阀的外观示意图；Fig. 1 is the appearance diagram of self-cleaning type constant flow control valve of the present invention;
图2是本发明自清洁型恒流量控制阀的结构示意图；Fig. 2 is a schematic structural view of the self-cleaning constant flow control valve of the present invention;
图3是本发明自清洁型恒流量控制阀的控制结构示意图；Fig. 3 is a schematic diagram of the control structure of the self-cleaning constant flow control valve of the present invention;
图4是本发明自清洁型恒流量控制阀的反馈结构示意图。Fig. 4 is a schematic diagram of the feedback structure of the self-cleaning constant flow control valve of the present invention.
具体实施方式Detailed ways
下面结合附图对本发明的具体实施方式进行进一步的详细描述。Specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.
新一代运载火箭伺服机构采用高压煤油恒速液动机作为动力元件，液动机包括恒流量控制阀和定排量液压马达两部分，将高压煤油由发动机引流至液动机进行作功，驱动液动机带动伺服机构工作，作功之后的低压煤油通过低压管路流回发动机。液动机属于伺服系统的关键元件，对油液的颗粒度较为敏感，引流煤油中的杂质有可能影响液动机正常工作；同时液动机本身在运转过程中也会产生杂质，这些杂质会随着油液流回发动机，有可能作为多余物污染发动机。本发明的一个特点就是消除了这些隐患。The new-generation launch vehicle servo mechanism uses high-pressure kerosene constant-speed hydraulic motor as the power component. The hydraulic motor includes two parts: a constant flow control valve and a fixed-displacement hydraulic motor. The servo mechanism works, and the low-pressure kerosene after doing work flows back to the engine through the low-pressure pipeline. The hydraulic motor is a key component of the servo system and is sensitive to the particle size of the oil. The impurities in the drained kerosene may affect the normal operation of the hydraulic motor; at the same time, the hydraulic motor itself will also produce impurities during operation, and these impurities will be with the oil. The fluid flows back into the engine, potentially contaminating the engine as excess. It is a feature of the present invention that these hidden dangers are eliminated.
本发明所涉及的自清洁型恒流量控制阀，主要应用于新一代运载火箭液压伺服系统，为定排量液压马达提供预定流量的高压油液，配合实现液压马达的恒转速控制。结构上采用“高压过滤器+两级滑阀+低压过滤器”的配置方式。在恒流量阀的入口集成了一个高压过滤器，对引流的发动机高压煤油进行过滤，防止其中的杂质进入恒流量控制阀；在恒流量控制阀的出口集成了一个低压过滤器，对流出恒流量控制阀流回发动机的低压煤油进行过滤，防止恒流量控制阀中产生的杂质污染发动机。The self-cleaning constant flow control valve involved in the present invention is mainly used in the hydraulic servo system of a new generation launch vehicle to provide high-pressure oil with a predetermined flow rate for a fixed-displacement hydraulic motor, and cooperate to realize the constant speed control of the hydraulic motor. Structurally, the configuration of "high pressure filter + two-stage slide valve + low pressure filter" is adopted. A high-pressure filter is integrated at the inlet of the constant flow control valve to filter the high-pressure kerosene of the engine to prevent impurities from entering the constant flow control valve; a low-pressure filter is integrated at the outlet of the constant flow control valve to control the flow of constant flow The low-pressure kerosene flowing back to the engine from the control valve is filtered to prevent impurities generated in the constant flow control valve from contaminating the engine.
本发明所涉及的自清洁型恒流量控制阀，在两级恒流量阀的基础上集成了高低压过滤器。在实现恒定大流量输出控制的同时，起到了隔离杂质的作用，具备了自清洁的能力。The self-cleaning constant flow control valve involved in the present invention integrates high and low pressure filters on the basis of the two-stage constant flow valve. While realizing constant large flow output control, it plays the role of isolating impurities and has the ability of self-cleaning.
如图1所示，本发明提供了一种自清洁型恒流量控制阀，包括：低压过滤器2、通油套4、高压过滤器5、高压过滤器壳体6和恒流量控制阀主体38；恒流量控制阀主体38的进油口处装有高压过滤器壳体6，高压过滤器5设置在高压过滤器壳体6内部，用于清洁输入的油液，提高系统的抗油液污染能力；As shown in Figure 1, the present invention provides a self-cleaning constant flow control valve, including: a low pressure filter 2, an oil sleeve 4, a high pressure filter 5, a high pressure filter housing 6 and a constant flow control valve body 38 ; The oil inlet of the constant flow control valve main body 38 is equipped with a high-pressure filter housing 6, and the high-pressure filter 5 is arranged inside the high-pressure filter housing 6 to clean the input oil and improve the system's resistance to oil pollution ability;
恒流量控制阀主体38的出油口和低压过滤器2之间通过通油套4进行连接和密封，低压过滤器2用于清洁输出的油液，降低对系统下游产生污染的风险；恒流量控制阀主体38用于对流经其中的油液进行恒流量控制。高压过滤器5的进油口和低压过滤器2的出油口朝向一致，便于系统上下游管路在有限空间内进行布置，节省空间。The oil outlet of the main body 38 of the constant flow control valve and the low pressure filter 2 are connected and sealed through the oil sleeve 4. The low pressure filter 2 is used to clean the output oil and reduce the risk of pollution to the downstream of the system; constant flow The control valve body 38 is used for constant flow control of the oil flowing through it. The oil inlet of the high-pressure filter 5 is in the same direction as the oil outlet of the low-pressure filter 2, which facilitates the arrangement of the upstream and downstream pipelines in the system in a limited space and saves space.
恒流量控制阀主体38包括导阀、主阀、阀壳体1、第一阻尼器21、第二阻尼器32、第三阻尼器33、第一密封结构22和第二密封结构34；The constant flow control valve main body 38 includes a pilot valve, a main valve, a valve housing 1, a first damper 21, a second damper 32, a third damper 33, a first sealing structure 22 and a second sealing structure 34;
导阀、主阀和第一阻尼器21均安装在阀壳体1中，第一阻尼器21位于导阀和主阀之间，用于调节主阀流量的超调量，在一定范围内增大第一阻尼器的阻尼孔直径，可以降低主阀流量的超调量，同时响应的快速性也会降低，第一阻尼器的设置为调节恒流量控制性能提供了便利条件；第二阻尼器32和第三阻尼器33串联安装在阀壳体1内，为导阀提供反馈压力，阀壳体1内设置有低压腔7和高压腔8，作为恒流量控制阀主体38与其负载的接口，分别实现由恒流量阀流向负载和由负载流回恒流量阀的连接；第一密封结构22实现第一阻尼器21油路的对外密封，第二密封结构34实现第三阻尼器33的对外密封。The pilot valve, the main valve and the first damper 21 are all installed in the valve housing 1, and the first damper 21 is located between the pilot valve and the main valve, and is used to adjust the overshoot of the flow of the main valve. The diameter of the damping hole of the first damper can reduce the overshoot of the flow rate of the main valve, and at the same time, the rapidity of response will also be reduced. The setting of the first damper provides a convenient condition for adjusting the constant flow control performance; the second damper 32 and the third damper 33 are installed in series in the valve housing 1 to provide feedback pressure for the pilot valve. The valve housing 1 is provided with a low-pressure chamber 7 and a high-pressure chamber 8 as the interface between the constant flow control valve body 38 and its load. Respectively realize the connection from the constant flow valve to the load and from the load back to the constant flow valve; the first sealing structure 22 realizes the external sealing of the oil circuit of the first damper 21, and the second sealing structure 34 realizes the external sealing of the third damper 33 .
所述导阀包括第一螺堵9、限位块10、导阀套11、导阀芯12、垫套13、螺套14、顶针15、顶座16、第一弹簧17、第一弹簧座18、调节螺套19和锁紧螺母20；The pilot valve includes a first screw plug 9, a limit block 10, a pilot valve sleeve 11, a pilot valve core 12, a cushion sleeve 13, a screw sleeve 14, a thimble 15, a top seat 16, a first spring 17, and a first spring seat 18. Adjust screw sleeve 19 and lock nut 20;
导阀套11位于阀壳体1内，第一螺堵9安装在导阀套11的一端，垫套13安装在导阀套11的另一端，螺套14安装在垫套13的外部，通过拧紧第一螺堵9和螺套14将导阀套11固定在阀壳体1上；导阀芯12安装在导阀套11内，其靠近第一螺堵9的一端安装限位块10，用于对导阀芯12进行限位，其另一端通过垫套13实现限位；The pilot valve sleeve 11 is located in the valve housing 1, the first screw plug 9 is installed on one end of the pilot valve sleeve 11, the gasket 13 is installed on the other end of the pilot valve sleeve 11, and the screw sleeve 14 is installed on the outside of the gasket 13, through Tighten the first screw plug 9 and the screw sleeve 14 to fix the pilot valve sleeve 11 on the valve housing 1; the pilot valve core 12 is installed in the pilot valve sleeve 11, and a limit block 10 is installed near the end of the first screw plug 9, It is used to limit the position of the pilot valve core 12, and the other end is limited by the cushion sleeve 13;
在导阀芯12靠近垫套13的一端安装有顶针15、顶座16、第一弹簧17、第一弹簧座18和调节螺套19，顶针15、顶座16以及第一弹簧座18配合，用于将第一弹簧17的弹簧力传递给导阀芯12；调节螺套19与螺套14之间是螺纹连接，通过调整调节螺套19，改变第一弹簧17的预压缩量，相应地改变预先设定的作用在导阀芯12上的弹簧力的大小，从而调整恒流量控制阀目标流量的设定值。At the end of the guide valve core 12 close to the pad cover 13, a thimble 15, a top seat 16, a first spring 17, a first spring seat 18 and an adjusting screw sleeve 19 are installed, and the thimble 15, the top seat 16 and the first spring seat 18 cooperate. It is used to transmit the spring force of the first spring 17 to the pilot valve core 12; the adjusting screw sleeve 19 and the screw sleeve 14 are threadedly connected, and by adjusting the adjusting screw sleeve 19, the precompression amount of the first spring 17 is changed, correspondingly The preset value of the spring force acting on the pilot valve core 12 is changed to adjust the set value of the target flow of the constant flow control valve.
所述主阀包括第一螺座24、第二弹簧座25、第二弹簧26、主阀套27、主阀芯28、第三弹簧29、第三弹簧座30和第二螺座31；The main valve includes a first screw seat 24, a second spring seat 25, a second spring 26, a main valve sleeve 27, a main valve core 28, a third spring 29, a third spring seat 30 and a second screw seat 31;
主阀套27位于阀壳体1内，主阀套27一端安装第一螺座24，另一端安装第二螺座31，第一螺座24和第二螺座31将主阀套27固定在阀壳体1上；主阀芯28安装在主阀套27内，主阀芯28靠近第一螺座24的一端布置第二弹簧26和第二弹簧座25，主阀芯28的另一端布置第三弹簧29和第三弹簧座30，第二弹簧座25和第三弹簧座30分别安装在第一螺座24和第二螺座31中，第二弹簧26和第三弹簧29用于实现主阀芯28的复位，第三弹簧座30为主阀芯28进行限位，限制主阀的最小开度。The main valve sleeve 27 is located in the valve housing 1, the first screw seat 24 is installed at one end of the main valve sleeve 27, and the second screw seat 31 is installed at the other end, the first screw seat 24 and the second screw seat 31 fix the main valve sleeve 27 on the On the valve housing 1; the main valve core 28 is installed in the main valve sleeve 27, the second spring 26 and the second spring seat 25 are arranged on the end of the main valve core 28 close to the first screw seat 24, and the other end of the main valve core 28 is arranged The third spring 29 and the third spring seat 30, the second spring seat 25 and the third spring seat 30 are respectively installed in the first screw seat 24 and the second screw seat 31, the second spring 26 and the third spring 29 are used to realize When the main valve core 28 is reset, the third spring seat 30 limits the position of the main valve core 28 to limit the minimum opening of the main valve.
第二弹簧26和第三弹簧29的刚度相同，这两个弹簧共同作用使主阀芯28复位。The second spring 26 and the third spring 29 have the same rigidity, and the two springs work together to reset the main valve core 28 .
主阀的第一螺座24与导阀的第一螺堵9朝向相同。The first screw seat 24 of the main valve faces the same direction as the first screw plug 9 of the pilot valve.
导阀的两个输出口通过阀壳体1上的流道分别连接到主阀芯28的两侧，实现导阀对主阀的控制，从导阀输出口到主阀芯28两侧的连接油路上，并联有第一阻尼器21，在一定范围内增大第一阻尼器21的阻尼孔直径，可以降低主阀流量的超调量，同时响应的快速性也会降低，第一阻尼器21的设置为调节恒流量控制性能提供了便利条件。The two output ports of the pilot valve are respectively connected to both sides of the main valve core 28 through the flow passages on the valve housing 1 to realize the control of the main valve by the pilot valve. On the oil circuit, there is a first damper 21 connected in parallel. Increasing the diameter of the damping hole of the first damper 21 within a certain range can reduce the overshoot of the flow rate of the main valve, and at the same time, the rapidity of response will also be reduced. The first damper The setting of 21 provides convenient conditions for adjusting the constant flow control performance.
导阀的输出口通过阀壳体1上的流道连接到主阀阀芯28的左右两腔，实现导阀对主阀的控制。在阀壳体1上，从导阀输出口到主阀芯28左右两腔的连接油路上，并联一个阻尼器21，在阻尼器21的右端布置第一密封结构22，将阻尼器21固定在阀壳体1中。导阀的输出油液用于控制主阀，实现对系统流量的控制，阻尼器21并联在主阀阀芯28的两侧，用于改善主阀阀芯的控制性能，降低主阀芯运动的超调量。The output port of the pilot valve is connected to the left and right cavities of the main valve spool 28 through the flow channel on the valve housing 1, so as to realize the control of the pilot valve to the main valve. On the valve housing 1, a damper 21 is connected in parallel on the connecting oil path from the output port of the pilot valve to the left and right chambers of the main valve core 28, and a first sealing structure 22 is arranged at the right end of the damper 21 to fix the damper 21 on in the valve housing 1. The output oil of the pilot valve is used to control the main valve to realize the control of the system flow. The damper 21 is connected in parallel on both sides of the main valve spool 28 to improve the control performance of the main valve spool and reduce the movement of the main valve spool. Overshoot.
反馈控制回路的组成如图4所示。阻尼器32和33串联布置在阀壳体1内，通过第二密封结构34固定在阀壳体1上；在负载(液压马达)回油的低压腔7和低压过滤器2之间，布置一个固定节流孔37；将低压腔7通过流道连接到阻尼器33的右侧，阻尼器32的左侧通过流道36连接到低压过滤器2的入口；在阻尼器32和33之间布置一个流道，连接到导阀芯12的右侧。固定节流孔37将低压回油的流量转换为压力信号，并通过与固定节流孔37相并联的两个串联分压阻尼器32和33，并将阻尼器32和33中间的压力作为反馈信号，通过油路连接到导阀芯12的右侧，与导阀芯12左侧弹簧17预设的弹簧力相比较，形成流量负反馈，实现恒定流量控制。The composition of the feedback control loop is shown in Figure 4. The dampers 32 and 33 are arranged in series in the valve housing 1, and are fixed on the valve housing 1 through the second sealing structure 34; between the low-pressure chamber 7 where the load (hydraulic motor) returns oil and the low-pressure filter 2, a Fix the orifice 37; connect the low-pressure chamber 7 to the right side of the damper 33 through the flow channel, and connect the left side of the damper 32 to the inlet of the low-pressure filter 2 through the flow channel 36; arrange between the dampers 32 and 33 A flow channel is connected to the right side of the pilot spool 12. The fixed orifice 37 converts the flow rate of the low-pressure return oil into a pressure signal, and passes through two serial pressure-dividing dampers 32 and 33 connected in parallel with the fixed orifice 37, and the pressure between the dampers 32 and 33 is used as feedback The signal is connected to the right side of the pilot spool 12 through the oil circuit, and is compared with the preset spring force of the spring 17 on the left side of the pilot spool 12 to form flow negative feedback and realize constant flow control.
实施例：Example:
高压过滤器过滤精度40μm，对流进恒流量控制阀的油液过滤精度高，有效保护恒流量控制阀及其负载免于油液污染产生的不良影响；The high-pressure filter has a filtration accuracy of 40 μm, and has a high filtration accuracy for the oil flowing into the constant flow control valve, effectively protecting the constant flow control valve and its load from the adverse effects of oil pollution;
低压过滤器过滤精度90μm，对流出恒流量控制阀的油液进行再次过滤，过滤精度较高，避免恒流量控制阀及其负载产生的颗粒杂质对下游造成污染。The filtration accuracy of the low-pressure filter is 90 μm, and the oil flowing out of the constant flow control valve is re-filtered. The filtration accuracy is high, and the particle impurities generated by the constant flow control valve and its load are prevented from polluting the downstream.
限位块10和垫套13对导阀芯12进行限位，使导阀芯12在其中位附近的0.5mm范围内运动，减小导阀芯12的无效行程，确保导阀的响应速度。The limit block 10 and the gasket 13 limit the pilot valve core 12, so that the pilot valve core 12 can move within 0.5mm near its neutral position, reduce the invalid stroke of the pilot valve core 12, and ensure the response speed of the pilot valve.
第三弹簧座30的长度为20.5mm，在其限位作用下，主阀的最小开度为1.5mm，第三弹簧座30的限位作用，一方面防止动态过程中主阀开度过小影响流量，另一方面防止因主阀阀芯过冲引发的流量振荡。The length of the third spring seat 30 is 20.5 mm. Under its limit function, the minimum opening of the main valve is 1.5 mm. The limit function of the third spring seat 30 prevents the main valve opening from being too small during the dynamic process on the one hand. Affect the flow, on the other hand, prevent the flow oscillation caused by the overshoot of the main valve spool.
第一阻尼器21的孔径为0.8mm，取得较小的流量超调和可以接受的相应时间。The hole diameter of the first damper 21 is 0.8 mm, which achieves small flow overshoot and acceptable response time.
第二阻尼器32和第三阻尼器33阻尼孔直径分别取0.3mm和0.8mm，可以将反馈压力稳定地输出并控制导阀。The diameters of the damping holes of the second damper 32 and the third damper 33 are respectively 0.3mm and 0.8mm, which can output the feedback pressure stably and control the pilot valve.
本发明自清洁型恒流量控制阀应用范围包括但不局限于液压马达的恒速控制，还可以拓展应用于任何需要具备自清洁能力的恒流量输出的场合。The application range of the self-cleaning constant flow control valve of the present invention includes but is not limited to the constant speed control of hydraulic motors, and can also be extended and applied to any occasions requiring constant flow output with self-cleaning capability.
本发明说明书中未作详细描述的内容属于本领域的公知技术。The content that is not described in detail in the specification of the present invention belongs to the known technology in the art.
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