A bidirectional synchronous interlocking electro-hydraulic controlled pilot valve structure

Abstract

The present invention relates to the technical field of control valves, and discloses a two-way synchronous interlocking electro-hydraulic controlled pilot valve structure, comprising a valve body, a two-way valve core, and a valve push rod; a liquid inlet chamber, a working chamber, a liquid return chamber, and a balancing chamber are arranged in the valve body, the working chamber is connected with the liquid return chamber through a first opening at one end, and is connected with the liquid inlet chamber through a second opening at the other end; the two-way valve core is arranged in the working chamber, a first baffle at one end of the two-way valve core is adapted to the first opening, and a second baffle at the other end of the two-way valve core is adapted to the second opening; the valve push rod comprises a push rod head and a push rod column, one end of the push rod head is provided with a pressure surface and a push rod column, and the other end of the push rod head is connected with the first baffle; the balancing chamber is connected with the liquid inlet chamber, and the area of ​​the pressure surface is the same as the area of ​​the second baffle; a liquid inlet channel is arranged on the liquid inlet chamber, a working channel is arranged on the working chamber, and a liquid return channel is arranged on the liquid return chamber, which has the advantage of enhancing the stability of the two-way valve core operation and the reliability of the device operation.

Description

Technical Field

[0001] The invention relates to the technical field of control valves, and in particular to a bidirectional synchronous interlocking electro-hydraulic controlled pilot valve structure. Background Art

[0002] The mine electromagnetic pilot valve is a key device of the hydraulic support electro-hydraulic main valve, and the dynamic characteristics of its valve core are the key to the performance of the electro-hydraulic main valve equipment. When the electromagnetic coil is not energized, the mine electromagnetic pilot valve closes the drain valve port and opens the return valve port through the spring force; when the electromagnetic coil is energized, the push rod is controlled to move the valve core, open the drain valve port, and close the return valve port at the same time.

[0003] However, after the electromagnetic coil is energized, it not only has to overcome the spring force at the other end of the valve core, but also has to overcome the hydraulic pressure of the working chamber fluid on the valve core in order to push the valve core to achieve the opening and closing of the corresponding valve port, making the valve core prone to slow response and insufficient push rod thrust under the action of hydraulic pressure.

[0004] In summary, the present invention proposes a bidirectional synchronous electro-hydraulic controlled pilot valve structure, which aims to solve the problem of unstable valve core operation caused by the additional hydraulic pressure that the electromagnetic force has to overcome when pushing the push rod in the traditional pilot valve structure, thereby improving the operating reliability of the device. Summary of the invention

[0005] In view of the problem of unstable operation of bidirectional valve core in the prior art, a bidirectional synchronous interlocking electro-hydraulic pilot valve structure is proposed, which can increase the operation stability of the bidirectional valve core of the electro-hydraulic pilot valve.

[0006] In order to solve the above problems, the technical solution of the present invention is:

[0007] A bidirectional synchronous interlocking electro-hydraulic pilot valve structure comprises a valve body, a bidirectional valve core and a valve push rod; a liquid inlet chamber, a working chamber, a liquid return chamber and a balancing chamber are arranged in the valve body; the working chamber is connected with the liquid return chamber through a first opening at one end, and the working chamber is connected with the liquid inlet chamber through a second opening at the other end; a liquid inlet channel is arranged on the liquid inlet chamber, a working channel is arranged on the working chamber, and a liquid return chamber is provided with a liquid return channel; the bidirectional valve core passes through the working chamber, and a first baffle plate adapted to the first opening is arranged at one end of the bidirectional valve core, The other end of the two-way valve core is provided with a second baffle plate adapted to the second opening; the valve push rod includes a push rod head and a push rod column, the push rod head separates the balancing chamber and the return liquid chamber, the push rod column is connected to the push rod head at one end of the balancing chamber, wherein the cross-sectional area of ​​the push rod column is smaller than the cross-sectional area of ​​the push rod head, and the surface not covered by the push rod column is a pressure surface; the balancing chamber is connected to the liquid inlet chamber, and the area of ​​the pressure surface is the same as the area of ​​the bottom of the second baffle plate; a spring is connected to one end of the second baffle plate.

[0008] As a preferred technical solution, the valve body is detachably provided with a liquid inlet valve seat, a working valve seat and a liquid return valve seat; the liquid inlet valve seat is provided with the liquid inlet cavity, the working valve seat is provided with the working cavity, and the liquid return valve seat is provided with the liquid return cavity and the balance cavity.

[0009] As a preferred technical solution, the first baffle is a flat valve structure.

[0010] As a preferred technical solution, an arc structure is provided on the flat valve.

[0011] As a preferred technical solution, the second baffle is a cone valve structure.

[0012] As a preferred technical solution, a limiting column is provided under the second baffle.

[0013] As a preferred technical solution, an anti-rotation channel is provided in the working chamber, and an anti-rotation member matched with the anti-rotation channel is provided on the two-way valve core.

[0014] As a preferred technical solution, a fitting is provided on the spring, and when the first baffle is matched with the first opening, the upper surface of the fitting is matched with the bottom surface of the second baffle, and the lower surface of the fitting is adapted to the surface of the second baffle for sealing the second opening.

[0015] As a preferred technical solution, the anti-deformation force of the spring in at least part of the fitting is smaller than the anti-deformation force of the spring without the fitting.

[0016] Beneficial effects of the present invention:

[0017] The bidirectional synchronous interlocking electro-hydraulic controlled pilot valve structure described in the present invention is achieved by setting a balancing chamber at one end of the push rod head used to push the bidirectional valve core, and the balancing chamber is connected to the liquid inlet chamber at the other end of the bidirectional valve core, so that the balancing chamber and the liquid inlet chamber are interconnected, providing a balanced environment for the liquid pressure balance of the bidirectional valve core at the second baffle located in the liquid inlet chamber.

[0018] The valve push rod includes a push rod head and a push rod column. The push rod column is connected to the push rod head, and the cross-sectional area of ​​the push rod column is smaller than the cross-sectional area of ​​the push rod head, so that the push rod column does not completely cover the connection surface connected to the push rod head. For example, the push rod column is a cylinder with a diameter smaller than that of the push rod head; the uncovered pressure surface is equal to the contact area between the bottom of the second baffle and the liquid in the liquid inlet chamber, thereby balancing the liquid pressure acting on both ends of the two-way valve stem. The valve push rod only needs to overcome the spring force at the second baffle to do work, and does not need to overcome additional liquid pressure, so that the operation of the two-way valve core is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The cross-sectional view of the bidirectional synchronous interlocking electro-hydraulic pilot valve structure of the present invention is shown in FIG. Figure 1 ;

[0020] Figure 2 The cross-sectional view of the bidirectional synchronous interlocking electro-hydraulic pilot valve structure of the present invention is shown in FIG. Figure 2 ;

[0021] Figure 3 A schematic diagram of a valve push rod of a bidirectional synchronous interlocking electro-hydraulic pilot valve structure according to the present invention;

[0022] Figure 4 A schematic diagram of a liquid inlet valve seat of a bidirectional synchronous interlocking electro-hydraulic pilot valve structure according to the present invention;

[0023] Figure 5 It is a partial cutaway schematic diagram of the working valve seat of the bidirectional synchronous interlocking electro-hydraulic pilot valve structure of the present invention;

[0024] Figure 6 It is a partial cutaway schematic diagram of the liquid return valve seat of the bidirectional synchronous interlocking electro-hydraulic controlled pilot valve structure of the present invention;

[0025] Figure 7 A schematic diagram of a bidirectional valve core of a bidirectional synchronous interlocking electro-hydraulic pilot valve structure according to the present invention;

[0026] Figure 8 It is a partial cross-sectional schematic diagram of the cooperation between the bidirectional valve core and the working valve seat of the bidirectional synchronous interlocking electro-hydraulic pilot valve structure of the present invention;

[0027] Fig. 9 It is a schematic diagram of the spring with the fitting part in the extended state and the cooperation with the second baffle;

[0028] Fig.10 A schematic diagram of the spring with the fitting part in a compressed state and the second baffle;

[0029] Fig.11 It is a partial schematic diagram of the straightening of the spring with the fitting;

[0030] Fig.12 A partial schematic diagram of another spring with a fitting.

[0031] The reference numerals and components involved in the drawings are as follows:

[0032] 1. Valve body; 2. Two-way valve core; 3. Valve push rod; 4. Liquid inlet valve seat; 5. Working valve seat; 6. Liquid return valve seat; 7. Balance chamber; 8. Spring; 21. First baffle plate; 22. Second baffle plate; 23. Anti-rotation part; 24. Guide rod; 31. Push rod head; 32. Push rod column; 33. Pressure surface; 41. Liquid inlet chamber; 42. Liquid inlet channel opening; 51. Working chamber; 52. First opening; 53. Second opening; 54. Working channel opening; 55. Anti-rotation channel; 61. Liquid return chamber; 62. Liquid return channel opening; 81. Fitting part; 221. Limit column; 811. Starting surface; 812. End surface. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0034] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Please see attached Figure 1 , Attachment Figure 2 , Figure 1 The cross-sectional view of the bidirectional synchronous interlocking electro-hydraulic pilot valve structure of the present invention is shown in FIG. Figure 1 ; Figure 2 The cross-sectional view of the bidirectional synchronous interlocking electro-hydraulic pilot valve structure of the present invention is shown in FIG. Figure 2 ;in, Figure 1 and Figure 2 1 and 1 , and a valve stem 3 is provided to control the flow of the two-way valve core 2. The two-way valve core 2 is provided with a first baffle plate 21 adapted to the first opening 52 and the second baffle plate 22 adapted to the second opening 53. Figure 2, when the first baffle 21 and the first opening 52 are combined, that is, the liquid return chamber 61 is isolated from the working chamber 51, the second baffle 22 and the second opening 53 are in a separated state, that is, the working chamber 51 is connected to the liquid inlet chamber 41; see Figure 1 , when the second baffle 22 is combined with the second opening 53, that is, the working chamber 51 is isolated from the liquid inlet chamber 41, the first baffle 21 and the first opening 52 are in a separated state, that is, the working chamber 51 is connected to the liquid return chamber 61. Compared with the traditional "three-body" double-check valve structure, the "integrated" two-way valve core 2 structure has significant advantages. The synchronous interlocking performance of the traditional structure is easily affected by multiple factors such as the position of the independent valve core, the size of the push rod, the posture of the push rod and the external load, while the synchronous interlocking performance of the "integrated" two-way valve core 2 is almost unaffected by these external factors, which ensures the synchronous interlocking of the electro-hydraulic pilot valve and improves the reliability of the two-way valve core 2.

[0036] The first baffle plate 21 of the two-way valve core 2 is externally connected to the valve push rod 3, and the valve push rod 3 can be moved by electromagnetic drive. Its driving mode can be direct drive, such as the valve push rod 3 is directly pushed by the electromagnetic, and its driving mode can also be indirect drive, such as the valve push rod 3 is pushed by an external electromagnetic drive rod. It should be noted that the electromagnetic drive rod is a power source for pushing the valve push rod 3 to move. It generates thrust when it is energized and the thrust disappears when it is de-energized. This is the prior art and is not shown in the figure; a spring 8 is connected under the second baffle plate 22 of the two-way valve core 2. Under the push of the valve push rod 3, the spring 8 is compressed, and the liquid inlet chamber 41 is connected to the working chamber 51. When the electromagnetic power is off, the spring 8 rebounds, and the liquid inlet chamber 41 and the working chamber 51 are separated.

[0037] Please see attached Figure 3 , Figure 3 Schematic diagram of the valve push rod of the bidirectional synchronous interlocking electro-hydraulic pilot valve structure of the present invention; the valve push rod 3 includes a push rod head 31 and a push rod column 32, one end of the push rod head 31 is connected to the push rod column 32, specifically, the push rod column 32 is a cylindrical structure with a diameter smaller than the diameter of the push rod head 31, and on the surface where the push rod head 31 and the push rod column 32 are connected, the surface not covered by the push rod column 32 is a pressure surface 33, and the pressure surface 33 has the same area as the bottom surface of the second baffle 22, and the return liquid chamber 61 is The balancing chambers 7 are separated by the push rod head 31; the other side of the push rod head 31 is in contact with the first baffle 21, and the pressure surface 33 of the push rod head 31 is the bottom cavity wall of the balancing chamber 7, and the bottom refers to the relative position relationship under the two-way valve core 2 displayed in a vertical state in the accompanying drawings of this embodiment; the balancing chamber 7 is connected to the liquid inlet chamber 41, and its connecting channel is not shown in the accompanying drawings. Its connecting channel can be connected by a pipeline outside the valve body 1. In some embodiments, its connecting channel can also be arranged inside the valve body 1.

[0038] The liquid inlet chamber 41 is provided with a liquid inlet channel opening 42, and the liquid inlet channel opening 42 is communicated with the hydraulic oil tank, and the oil is pumped into the liquid inlet chamber 41 through the liquid inlet channel opening 42; the working chamber 51 is provided with a working channel opening 54, and the working channel opening 54 is connected to an external load, and the oil enters the external load, such as a hydraulic rod, through the working channel opening 54; the return liquid chamber 61 is provided with a return liquid channel opening 62, and the return liquid channel opening 62 is communicated with the hydraulic oil tank, and the oil in the chamber flows back to the hydraulic oil tank through the return liquid channel opening 62.

[0039] The usage of the present invention is as follows: Taking the extension and retraction of the hydraulic telescopic rod as an example, the cylinder bodies on both sides of the piston of the hydraulic telescopic rod are respectively connected to two groups of working channel ports 54 of the two-way synchronous interlocking electro-hydraulic controlled pilot valve structure of the present invention. Here, the working process of one group of the two-way synchronous interlocking electro-hydraulic controlled pilot valve structure is used as an example for explanation: the liquid inlet channel port 42 and the liquid return channel port 62 are connected to the oil tank, and the working channel port 54 is connected to the cavity on one side of the piston in the hydraulic telescopic rod. When the electromagnetic drive rod above the valve push rod 3 is powered on and off, the electromagnetic drive rod pushes the valve The door push rod 3 moves downward, and the valve push rod 3 drives the two-way valve core 2 to move downward at the same time, the spring 8 is compressed, and the first baffle plate 21 is combined with the first opening 52 of the working chamber 51 to achieve the isolation of the return liquid chamber 61 and the working chamber 51. Synchronously, the second baffle plate 22 is combined with the second opening 53 of the working chamber 51, and the working chamber 51 is connected with the liquid inlet chamber 41, that is, the high-pressure oil pumped into the liquid inlet chamber 41 from the oil tank enters the piston chamber on one side of the hydraulic telescopic rod through the working channel port 54, pushing the hydraulic piston rod to move to one side. It should be noted that. At this time, in the valve body 1 of another group of the two-way synchronous interlocking electro-hydraulic pilot valve structure connected to the piston chamber on the other side of the hydraulic telescopic rod, the electromagnetic drive rod on the valve push rod 3 is in a power-off state and does not provide thrust. The valve push rod 3, under the action of the spring 8 under the second baffle 22, lifts the two-way valve core 2 upward, so that the second baffle 22 is combined with the second opening 53, isolating the working chamber 51 from the liquid inlet chamber 41, and correspondingly, the first baffle 21 is separated from the first opening 52, and the liquid return chamber 61 is connected to the working chamber 51. At this time, because another group of the two-way synchronous interlocking electro-hydraulic pilot valve structure is pushing the piston rod of the hydraulic telescopic rod to move, the oil in the compressed piston chamber is pressed from the working chamber 51 into the liquid return chamber 61, and flows into the oil tank through the liquid return channel 62. The two groups of the two-way synchronous interlocking electro-hydraulic pilot valve structures jointly realize the back and forth movement of the hydraulic telescopic rod.

[0040] In the bidirectional synchronous interlocking electro-hydraulic pilot valve structure of the present invention, a balancing chamber 7 is provided in the valve body 1, one wall of the balancing chamber 7 is one side of the push rod head 31 on the valve push rod 3, the other side of the push rod head 31 is directly in contact with or connected to the first baffle 21 of the bidirectional valve core 2, the second baffle 22 at the other end of the bidirectional valve core 2 is located in the liquid inlet chamber 41, and the balancing chamber 7 is connected to the liquid inlet chamber 41, that is, when the pressure surface 33 on the push rod head 31 is the same as the bottom surface area of ​​the second baffle 22, the two ends of the bidirectional valve core 2 are subjected to the pressure from The pressure of the oil is balanced, which reduces the negative impact of the liquid pressure in the liquid inlet chamber 41 on the downward movement of the two-way valve core 2, and further reduces the movement resistance when the valve push rod 3 pushes the two-way valve core 2 to move. At this time, the valve push rod 3 can relatively overcome the elastic force of the spring 8 and the friction between the two-way valve core 2 and the cavity wall to push the two-way valve core 2 to move, increasing the response speed of the valve and reducing the risk of incomplete up and down movement of the two-way valve core 2 due to insufficient thrust of the valve push rod 3, thereby affecting the sealing of each chamber interface and reducing the working efficiency of the working chamber 51. It should be understood that in this embodiment, the pressure surface 33 and the second baffle 22 are both perpendicular to the two-way valve core 2, and the directions of the liquid pressure acting on the pressure surface 33 and the second baffle 22 are exactly opposite.

[0041] Please see attached Figure 4 , Attachment Figure 5 , Attachment Figure 6 , Figure 4 A schematic diagram of a liquid inlet valve seat of a bidirectional synchronous interlocking electro-hydraulic pilot valve structure according to the present invention; Figure 5 It is a partial cutaway schematic diagram of the working valve seat of the bidirectional synchronous interlocking electro-hydraulic pilot valve structure of the present invention; Figure 6It is a partial cross-sectional schematic diagram of the return valve seat of the bidirectional synchronous interlocking electro-hydraulic controlled pilot valve structure of the present invention; preferably, for the convenience of maintenance, it also includes an inlet valve seat 4, a working valve seat 5, and a return liquid valve seat 6; the return liquid valve seat 6, the working valve seat 5, and the return liquid valve seat 6 are placed in the valve body 1, and the return liquid valve seat 6 is connected to the valve body 1 by threads to fix each valve seat in the valve body 1. Furthermore, in order to ensure the sealing between each chamber, a sealing ring is provided between the inlet valve seat 4 and the inner wall of the valve body 1 on which the inlet valve seat 4 is installed, which is used to isolate the inlet chamber 41 from the external space, and two groups of sealing rings are provided on the outer ring of the working valve seat 5, which are respectively used to isolate the working chamber 51 from the inlet chamber 41 and to isolate the working chamber 51 from the return liquid chamber 61; two groups of sealing rings are provided on the return liquid valve seat 6, which are respectively used to isolate the balancing chamber 7 from the return liquid chamber 61 and to isolate the balancing chamber 7 from the external space. Specifically, the slotted hole formed on the liquid inlet valve seat 4 and the cavity formed with the inner wall of the valve body 1 constitute the liquid inlet chamber 41. Similarly, the working valve seat 5 is provided with a channel for the valve seat to move and a channel connecting the liquid inlet chamber 41 and the liquid return chamber 61. The slotted hole formed on the liquid return valve seat 6 and the cavity formed with the inner wall of the valve body 1 constitute the liquid return chamber 61 and the balancing chamber 7. The balancing chamber 7 and the liquid return chamber 61 are separated by the push rod head 31. A sealing ring is provided on the valve push rod 3 to prevent the liquid in the balancing chamber 7 from flowing into the liquid return tank or overflowing out of the balancing chamber 7.

[0042] Please see attached Figure 7 , Attachment Figure 8 , Figure 7 A schematic diagram of a bidirectional valve core of a bidirectional synchronous interlocking electro-hydraulic pilot valve structure according to the present invention; Figure 8 It is a partial cutaway schematic diagram of the cooperation between the bidirectional valve core and the working valve seat of the bidirectional synchronous interlocking electro-hydraulic pilot valve structure of the present invention; wherein, Figure 8 No sealing ring is shown; since the rod body of the two-way valve core 2 is usually cylindrical, it has the freedom to rotate around the axis in the working chamber 51, which causes the two-way valve core 2 to easily produce rotational motion during the opening and closing process due to factors such as fluid flow or vibration of the two-way valve core 2; therefore, preferably, an anti-rotation channel 55 is provided in the working chamber 51, that is, a rectangular groove is provided on the inner wall of the cylindrical channel in the working valve body 1 for installing the two-way valve core 2, and correspondingly, an anti-rotation part 23 is provided on the two-way valve core 2, and the anti-rotation part 23 is a rectangular boss adapted to the rectangular groove. The cooperation of the rectangular boss and the rectangular groove limits the rotation of the valve body 1, reduces the risk of sliding wear, and reduces the possibility of vibration of the two-way valve core 2, thereby improving the sealing performance and reliability of the valve port, and its contact surface or contact part can also be made of copper with a low friction coefficient.

[0043] In some preferred embodiments, the first baffle 21 is a flat valve structure, and the connection between the lower side and the guide rod 24 of the two-way valve core 2 adopts an arc-shaped structure transition. When the liquid flows between the flat valve and the working valve seat 5, the flow capacity can be increased and the occurrence of valve port cavitation and erosion can be reduced. Preferably, the flat valve structure and the guide rod 24 of the two-way valve core 2 are connected by threads and thread glue can be applied to prevent the threads from loosening; the second baffle 22 is a cone valve structure, and the bottom of the cone valve is a flat structure with good sealing performance, which can effectively prevent liquid leakage from the high-pressure chamber.

[0044] In some embodiments, a limiting column 221 is provided below the second baffle 22, and the limiting column 221 can extend into the spring 8 to stably connect the second baffle 22 to the spring 8. At this time, the bottom area of ​​the second baffle 22 includes the bottom area of ​​the limiting column 221 and the area of ​​the engagement with the spring 8, and the spring 8 is located in the hydraulic oil in the liquid inlet chamber 41.

[0045] Please see attached Fig. 9 , Attachment Fig.10 ; Fig. 9 It is a schematic diagram of the spring with the fitting part in the extended state and the cooperation with the second baffle; Fig.10 Schematic diagram of the spring with the fitting in the compressed state and the second baffle. In order to further improve the stability of the electromagnetic drive, in some preferred embodiments, the spring 8 is provided with a fitting 81 that can fit with the bottom surface of the second baffle 22 in the compressed state. Specifically, the upper surface of the first circle of the spring 8 in contact with the second baffle 22 is a planar structure, and in order to adapt to the spiral downward structure of the spring 8, the fitting 81 is a progressive spiral downward boss, the starting surface 811 of the fitting 81 is located at the end of the spring 8, and the ending surface 812 of the fitting 81 is located at the end of the first circle of the spring 8, that is, a distance of one pitch from the starting surface 811; when the two-way valve core 2 is compressed to the point where the first baffle 21 fits the first opening 52, the starting surface 811 and the ending surface 812 are in contact with each other. The stop surface 812 is matched, and the upper surface of the fitting member 81 forms a circular plane, which is fitted with the bottom surface of the second baffle 22; it should be noted that the upper surface of the fitting member 81 is a plane, and the lower end is an arcuate surface. In this embodiment, the radial cross-section of its starting surface 811 is a semicircular, and the radial cross-section of its terminating surface 812 is a combination of a rectangle and a semicircle. The radial cross-section between the starting surface 811 and the terminating surface 812 presents a shape in which the height of the rectangle on the semicircle gradually increases; preferably, the rectangle on its radial cross-section can also be a trapezoid with a lower width at the top, and the upper surface of the fitting member 81 can cover the corresponding plane outside the limiting column 221 on the bottom of the second baffle 22; please refer to the attached Fig.11 , Attachment Fig.12 , Fig.11 It is a partial schematic diagram of the straightening of the spring with the fitting; Fig.12It is a partial schematic diagram of another spring with a fitting; it should be understood that the fitting 81 on the spring 8 can be formed into an integral structure by a mold forming process and a winding process, and the fitting 81 can also be a component that can be sleeved and installed on the end of the spring 8, and the anti-deformation force of the spring 8 in the component is less than the anti-deformation force of the spring 8 without the fitting 81.

[0046] When the fitting 81 is provided at the upper end of the spring 8, the electromagnetic drive rod pushes the valve push rod 3 to gradually move the two-way valve core 2 downward. At this time, the second baffle 22 of the two-way valve core 2 gradually fits with the upper surface of the fitting 81 on the spring 8, and the fitting 81 has an arc-shaped surface below, so that the plane area of ​​the bottom surface of the second baffle 22 gradually becomes smaller than the area of ​​the pressure-bearing surface 33 on the push rod head 31 in the balance chamber 7, and the arc-shaped surface of the lower surface of the fitting 81 can disperse the force direction. Therefore, as the valve push rod 3 further overlaps with the fitting 81, the liquid pressure it receives gradually becomes greater than the liquid pressure received at the bottom of the second baffle 22, thereby assisting the electromagnetic drive rod to press down the two-way valve core 2; the cross-section of the starting surface 811 of the fitting 81 is smaller than the cross-section of the spring 8 itself, and in the process of the two-way valve core 2 moving downward In the embodiment, the portion of the fitting 81 with a relatively small diameter is deformed first relative to the other portions of the original spring 8, that is, the anti-deformation force of the fitting 81 is smaller than the anti-deformation force of the spring 8 without the fitting 81, so that it is first fitted with the bottom plate of the second baffle 22 to achieve the hydraulic pressure difference at both ends of the two-way valve core 2; it should be noted that the force direction changed by the arc surface below the fitting 81 and the force offset by the conical surface of the conical valve of the second baffle 22 can further improve the operation stability of the two-way valve core 2, preferably, the shape below the fitting 81 is the same as the shape of the surface of the second baffle 22 used to block the second opening 53, and the direction is opposite, such as in the present embodiment, it is preferably an inverted conical surface in the opposite direction to the conical surface of the conical valve, and when the second baffle 22 is the spherical arc surface of the spherical valve, it is a hemispherical surface.

[0047] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the principle of the present invention. These improvements and supplements should also be regarded as the scope of protection of the present invention.

Claims

1. A bidirectional synchronous interlocking electro-hydraulic pilot valve structure, comprising a valve body, a bidirectional valve core, and a valve push rod; the valve body is provided with a liquid inlet chamber, a working chamber, a liquid return chamber, and a balancing chamber, the working chamber is connected with the liquid return chamber through a first opening at one end, and the working chamber is connected with the liquid inlet chamber through a second opening at the other end; the liquid inlet chamber is provided with a liquid inlet channel, the working chamber is provided with a working channel, and the liquid return chamber is provided with a liquid return channel; characterized in that, The two-way valve core runs through the working chamber, one end of the two-way valve core is provided with a first baffle plate adapted to the first opening, and the other end of the two-way valve core is provided with a second baffle plate adapted to the second opening; The valve push rod includes a push rod head and a push rod column, the push rod head separates the balancing chamber and the liquid return chamber, the push rod column is connected to one end of the push rod head located in the balancing chamber, wherein the cross-sectional area of ​​the push rod column is smaller than the cross-sectional area of ​​the push rod head, and the surface not covered by the push rod column is a pressure surface; the balancing chamber is connected to the liquid inlet chamber, and the area of ​​the pressure surface is the same as the area of ​​the bottom of the second baffle; a spring is connected to one end of the second baffle, and a fitting is provided on the spring, and when the first baffle is combined with the first opening, the upper surface of the fitting is in contact with the bottom surface of the second baffle, and the lower surface of the fitting is adapted to the surface of the second baffle used to seal the second opening.

2. The bidirectional synchronous interlocking electro-hydraulic pilot valve structure according to claim 1 is characterized in that: The valve body is detachably provided with a liquid inlet valve seat, a working valve seat and a liquid return valve seat; the liquid inlet valve seat is provided with the liquid inlet cavity, the working valve seat is provided with the working cavity, and the liquid return valve seat is provided with the liquid return cavity and the balance cavity.

3. The bidirectional synchronous interlocking electro-hydraulic controlled pilot valve structure according to claim 1 is characterized in that: The first baffle is a flat valve structure.

4. The bidirectional synchronous interlocking electro-hydraulic pilot valve structure according to claim 3 is characterized in that: The flat valve is provided with an arc structure.

5. The bidirectional synchronous interlocking electro-hydraulic pilot valve structure according to claim 1 is characterized in that: The second baffle is a cone valve structure.

6. The bidirectional synchronous interlocking electro-hydraulic pilot valve structure according to claim 1 is characterized in that: A limiting column is arranged under the second baffle.

7. The bidirectional synchronous interlocking electro-hydraulic pilot valve structure according to claim 1 is characterized in that: An anti-rotation channel is provided in the working chamber, and an anti-rotation member matched with the anti-rotation channel is provided on the two-way valve core.

8. The bidirectional synchronous interlocking electro-hydraulic controlled pilot valve structure according to claim 1 is characterized in that: The anti-deformation force of the spring in at least part of the fitting is smaller than the anti-deformation force of the spring without the fitting.

Images