CN211231827U - Pilot valve opening degree feedback mechanism - Google Patents
Pilot valve opening degree feedback mechanism Download PDFInfo
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- CN211231827U CN211231827U CN201921533669.1U CN201921533669U CN211231827U CN 211231827 U CN211231827 U CN 211231827U CN 201921533669 U CN201921533669 U CN 201921533669U CN 211231827 U CN211231827 U CN 211231827U
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Abstract
The application provides a pilot valve aperture feedback mechanism that structure is simpler, and it has the electrodeless feedback function of case aperture, changes on-off control adjustment into electrodeless adjustable feedback adjustment. The mechanism consists of a valve body, a valve core, a leather cup, a control valve core and a feedback guide rod; the valve body is provided with a valve seat, and a control valve hole is formed in the valve seat; a feedback adjusting hole is arranged on the valve core; the valve seat, the leather cup and the valve core jointly form a pressure cavity which is communicated with the front cavity and the rear cavity through the control valve hole and the feedback adjusting hole; the control valve core is correspondingly arranged on the control valve hole and can adjust the liquid flux of the control valve hole; the feedback guide rod is arranged on the valve seat and penetrates through the feedback adjusting hole, so that the liquid flux of the feedback adjusting hole can be adjusted; the control valve core can set the valve opening degree by adjusting the liquid flux of the control valve hole.
Description
Technical Field
The invention relates to a design and application neighborhood of a pilot valve in a pipeline valve, in particular to a pilot valve opening degree feedback mechanism capable of controlling the opening degree of the valve.
Background
The pilot valve is a common valve with small control moment, reliable control and long service life, and is particularly suitable for the field of automatic control. The method is applied to the fields of agricultural automation, industrial automation and the like.
The traditional pilot valve controls the on-off of a valve core back cavity and a pipeline pressure end through an auxiliary flow passage to achieve the purpose of opening and closing the valve. The traditional pilot valve can not control the opening degree of the valve by using a control flow channel, namely, the valve only has two states of full opening and full closing, and the controllable intermediate state can not be realized. In order to improve the problem, the traditional pilot valve adopts a mode of increasing manual limit to limit the maximum opening, but the limit control cannot be completed by utilizing a control flow channel, so that the control operation torque is very large, the advantage of small control torque of the pilot valve is lost, and the application field and the application range of the pilot valve are greatly limited.
The invention (a pilot valve with controllable opening degree, application number: 201510743446.8) solves the problem of adjustable opening degree by adopting a screw and a follow-up valve core. However, when the water pressure changes, the front and rear control valve cores in the control flow passage are only switched between a closed state and an open state, so that the main valve core is easy to generate overshoot phenomenon during adjustment, and valve shock is caused. And the screw rod mechanism is arranged in the valve cavity, so that the adjustment and the working condition are complex, and the problems of overhigh processing technology and high failure rate exist.
The other invention (the booster valve structure and the open-close control method, application number: 201710577355.0) of the inventor also adopts the principle of a follow-up valve core to realize that the dynamic valve core follows more, but the control valve core only relates to two switching states of close and open, so that the overshoot phenomenon is easily generated when the main valve core is adjusted.
The existing pilot valve can not realize bidirectional use due to the design and principle, namely the water inlet direction is fixed, and the existing pilot valve can not have the water inlet direction limitation like other valves. This relatively limits the application area of the pilot valve.
Disclosure of Invention
The purpose of this application is to solve above-mentioned problem, provides a pilot valve aperture feedback mechanism that structure is simpler from this, and it has the electrodeless feedback function of case aperture, changes on-off control adjustment into electrodeless adjustable feedback adjustment.
The feedback mechanism can have the functions of positive feedback and negative feedback at the same time, so the water inlet direction of the feedback mechanism is not limited by directionality; therefore, the valve cavity is described by adopting a front cavity and a rear cavity in the subsequent technical documents.
Based on the purposes, the mechanism consists of a valve body, a valve core, a leather cup, a control valve core and a feedback guide rod; the valve body is provided with a valve seat, and a control valve hole is formed in the valve seat; a feedback adjusting hole is arranged on the valve core; the valve seat, the leather cup and the valve core jointly form a pressure cavity which is communicated with the front cavity and the rear cavity through the control valve hole and the feedback adjusting hole; the control valve core is correspondingly arranged above the control valve hole and can adjust the liquid flux of the control valve hole; the feedback guide rod is arranged on the valve seat and penetrates through the feedback adjusting hole, so that the liquid flux of the feedback adjusting hole can be adjusted.
The valve core, the leather cup, the feedback guide rod and the feedback adjusting hole are coaxially arranged.
The mechanism of realization of the application is as follows: as shown in fig. 1, the pilot valve changes the valve opening degree by means of the axial displacement of the valve core, so that the present application adopts a feedback valve device linked with the valve core to convert the physical displacement of the valve core into the opening degree and flux change of the feedback valve. The feedback valve then controls the fluid flow from the pressure chamber P3 to cause a corresponding displacement change in the valve spool. Therefore, closed-loop feedback of valve core displacement is achieved, and opening degree feedback is also achieved.
Based on the principle, the feedback guide rod is of a rod-shaped structure and is provided with more than one guide rod section with different cross-sectional areas; when guide rod segments with different cross-sectional areas pass through the feedback adjusting hole, the feedback adjusting hole has corresponding liquid flux change.
As described above, when the opening of the valve core is changed, the cross-sectional area of the guide rod section in the feedback adjusting hole is increased due to the displacement of the feedback guide rod, and the liquid flux in the feedback adjusting hole is correspondingly decreased; on the contrary, the displacement of the feedback guide rod causes the section area of the guide rod section positioned in the feedback adjusting hole to be reduced, and the liquid flux is increased; thereby causing the pressure of the liquid in the pressure cavity to change, causing the leather cup to drive the valve core to make corresponding displacement change, and forming the opening feedback of the valve core; thereby establishing a closed loop feedback system of valve opening.
As described above, the valve element opening degree feedback is called opening degree positive feedback, and when the valve element opening degree is increased, the valve element opening degree feedback causes the valve element to perform an operation of increasing the opening degree; if the valve core opening degree is increased, the valve core opening degree feedback causes the valve core to perform the action of reducing the opening degree, which is called opening degree negative feedback.
The change trend of the section area of each guide rod section of the feedback guide rod can correspondingly form the effects of positive feedback and negative feedback. More than one feedback combination of positive feedback and negative feedback can be formed on one feedback guide rod, so that different feedback logics are generated under different opening degrees of the valve. Therefore, the flow channel design of the valve is simplified, and the complex flow channel control can be realized.
The control valve core is arranged in the control valve hole and can adjust the liquid flux of the control valve hole; the control valve hole and the feedback adjusting hole can jointly adjust the liquid flux in the pressure cavity; the change of the liquid flux in the pressure cavity can lead the leather cup to drive the valve core to change the opening degree of the valve.
The valve core, the leather cup, the feedback guide rod and the feedback adjusting hole are coaxially arranged; when the valve core generates axial displacement change relative to the valve seat, the feedback guide rod correspondingly changes the liquid flux of the feedback adjusting hole.
Drawings
The technical scheme of the application is given by the following figures and embodiments.
Fig. 1 is a schematic diagram of the feedback principle.
Fig. 2 is a schematic diagram of a conventional pilot valve application.
FIG. 3 is a schematic diagram of a tubular pilot valve application.
FIG. 4 is a schematic diagram of a multi-logic cross-section application of a tubular pilot valve.
Legend identification: 1. a valve body; 2. a feedback guide rod; 3. a feedback adjustment orifice; 4. a control valve bore; 5. a control valve core; 6. a valve core; 7. a leather cup; 8. a valve seat; p1, anterior chamber; p2, posterior chamber; p3, pressure chamber.
Detailed Description
The present application is not limited to the following examples, and specific implementations may be determined according to the technical solutions and practical situations of the present application.
Example 1: as shown in fig. 2: valve body 1, case 6, leather cup 7, disk seat 8, control valve core 5, feedback guide arm 2 have constituted the pilot valve aperture feedback mechanism of this application jointly.
The valve seat 8 and the valve body 1 are fixed into a whole, and the valve core 6, the leather cup 7 and the valve seat 8 form a closed pressure cavity together; the valve core 6 is provided with a feedback adjusting hole 3, the valve seat 8 is provided with a control valve hole 4, and the pressure cavity is communicated with a front cavity P1 and a rear cavity P2 of the valve body through the control valve hole 4 and the feedback adjusting hole 3.
The axes of the valve core 6, the leather cup 7 and the feedback guide rod 2 are coaxially arranged, and the feedback guide rod 2 can smoothly pass through the feedback adjusting hole 3 on the valve core 6;
the leather cup 7 has corresponding elasticity and stretching amount, and the valve core 6 can enable the feedback adjusting hole 3 to stay at the corresponding section of the feedback guide rod 2 under the driving of the leather cup 7.
The valve core 6 can communicate or separate the front cavity P1 and the rear cavity P2 under the driving of the leather cup 7;
the valve seat 8 is manufactured with a control valve hole 4, and the control valve core 5 is arranged at the center of the control valve hole 4; displacement of the control spool 5 may vary the liquid flux of the control valve bore 4.
Example 2: as shown in fig. 3: valve body 1, case 6, leather cup 7, disk seat 8, control valve core 5, feedback guide arm 2 have constituted the pilot valve aperture feedback mechanism of this application jointly.
The valve core 6, the leather cup 7, the valve seat 8, the control valve core 5 and the feedback guide rod 2 are all arranged in the valve body 1.
The valve seat 8 and the valve body 1 are fixed into a whole, and the valve core 6, the leather cup 7 and the valve seat 8 form a closed pressure cavity together; the valve core 6 is provided with a feedback adjusting hole 3, the valve seat 8 is provided with a control valve hole 4, and the pressure cavity is communicated with a front cavity P1 and a rear cavity P2 of the valve body through the control valve hole 4 and the feedback adjusting hole 3.
The axes of the valve body 1, the valve core 6, the leather cup 7 and the feedback guide rod 2 are coaxially arranged, and the feedback guide rod 2 can smoothly pass through the feedback adjusting hole 3 on the valve core 6.
The leather cup 7 has corresponding elasticity and stretching amount, and the valve core 6 can enable the feedback adjusting hole 3 to stay at the corresponding section of the feedback guide rod 2 under the driving of the leather cup 7.
The valve core 6 can communicate or separate the front cavity P1 and the rear cavity P2 under the driving of the cup 7.
The valve seat 8 is manufactured with a control valve hole 4, and the control valve core 5 is arranged at the center of the control valve hole 4; displacement of the control spool 5 may vary the liquid flux of the control valve bore 4.
Example 3: as shown in fig. 3: valve body 1, case 6, leather cup 7, disk seat 8, control valve core 5, feedback guide arm 2 have constituted the pilot valve aperture feedback mechanism of this application jointly.
The basic installation manner of the pilot valve opening degree feedback mechanism is basically the same as that of the embodiment 2.
According to the pilot valve opening feedback mechanism, the feedback guide rod 2 adopts a multi-section combined logic mode, and random feedback logics under different opening degrees can be realized.
Claims (6)
1. A pilot valve opening degree feedback mechanism is characterized in that: the mechanism consists of a valve body, a valve core, a leather cup, a control valve core and a feedback guide rod; the valve body is provided with a valve seat, and a control valve hole is formed in the valve seat; a feedback adjusting hole is arranged on the valve core; the valve seat, the leather cup and the valve core jointly form a pressure cavity which is communicated with the front cavity and the rear cavity through the control valve hole and the feedback adjusting hole; the control valve core is correspondingly arranged above the control valve hole and can adjust the size of the control valve hole; the feedback guide rod is arranged on the valve seat and penetrates through the feedback adjusting hole.
2. A pilot valve opening degree feedback mechanism according to claim 1, wherein: the feedback guide rod is of a rod-shaped structure and is provided with more than one guide rod section with different cross-sectional areas; when guide rod segments with different cross-sectional areas pass through the feedback adjusting hole, the feedback adjusting hole has corresponding liquid flux change.
3. A pilot valve opening degree feedback mechanism according to claim 1, wherein: the control valve core is arranged in the control valve hole and can adjust the liquid flux of the control valve hole.
4. A pilot valve opening degree feedback mechanism according to claim 2 or 3, wherein: the control valve hole and the feedback adjusting hole can jointly adjust the liquid flux in the pressure cavity; the change of the liquid flux in the pressure cavity can lead the leather cup to drive the valve core to change the opening degree of the valve.
5. A pilot valve opening degree feedback mechanism according to claim 1, wherein: the valve core, the leather cup, the feedback guide rod and the feedback adjusting hole are coaxially arranged.
6. A pilot valve opening degree feedback mechanism according to claim 1 or 5, wherein: when the valve core generates axial displacement change relative to the valve seat, the feedback guide rod correspondingly changes the liquid flux of the feedback adjusting hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921533669.1U CN211231827U (en) | 2019-09-16 | 2019-09-16 | Pilot valve opening degree feedback mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921533669.1U CN211231827U (en) | 2019-09-16 | 2019-09-16 | Pilot valve opening degree feedback mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211231827U true CN211231827U (en) | 2020-08-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921533669.1U Active CN211231827U (en) | 2019-09-16 | 2019-09-16 | Pilot valve opening degree feedback mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211231827U (en) |
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2019
- 2019-09-16 CN CN201921533669.1U patent/CN211231827U/en active Active
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