A high pressure on-off valve

Abstract

The application discloses a high-pressure switch valve and relates to the technical field of switch valves.The high-pressure switch valve comprises a coil assembly, a magnetic isolation sleeve, a valve seat and a valve bushing, the coil assembly is sleeved at the outside of the valve bushing, the magnetic isolation sleeve is fixedly sleeved at the inside of the valve bushing, the valve seat is fixedly connected to the top of the magnetic isolation sleeve, the outer wall of the magnetic isolation sleeve is provided with an inlet, the center of the valve seat is provided with an outlet, the bottom of the magnetic isolation sleeve is fixedly sleeved with a fixed iron core, the inside of the coil assembly is placed with a valve core assembly, and the valve core assembly is provided with a second spring between the fixed iron core; the valve core assembly comprises a pilot valve core, the high-pressure switch valve is improved through the valve core assembly, the first spring is arranged in the valve core assembly, the sealing of the valve body is not associated with the first spring, the pre-tightening force and the rigidity of the second spring can be reduced under the condition that the sealing force remains unchanged, the precision is improved, and the demand for greater pressure and flow is met.

Description

Technical Field

[0001] The present invention relates to the technical field of switch valves, and in particular to a high-pressure switch valve. Background Art

[0002] The air suspension air supply system uses an air compressor to compress and dry external air, then stores it in an air tank. The ECU, based on sensor feedback indicating vehicle posture, load, and road conditions, controls the solenoid valves to dynamically adjust the air pressure within the air springs. During inflation, high-pressure air is injected to increase vehicle height and support, while during deflation, air is expelled to lower the vehicle or soften the suspension. The system leverages a closed-loop control algorithm to achieve millisecond-level response, enabling rapid switching between multiple driving modes. Pre-storing high-pressure air reduces compressor startup and shutdown, reducing energy consumption. Its core advantage lies in its ability to balance handling stability and ride comfort while adapting to complex road conditions and varying loads. Combined with energy recovery and safety redundancy, it has become a key technology for enhancing ride quality and market competitiveness in high-end vehicles. It is widely used in luxury cars, SUVs, buses, trucks, and other vehicles. The solenoid valve adjusts the flow rate by adjusting the outlet opening and the valve opening duration, thereby adjusting the high pressure at the valve inlet to a low pressure. The solenoid valve is a critical component in the air suspension system.

[0003] The document with application publication number CN117515253A discloses a solenoid valve, an air suspension system and a vehicle, which records that "it includes a valve body, a valve seat, a valve core assembly, a fixed iron and a drive coil, the valve core assembly includes a first valve core, a second valve core, a connecting piece and a sealing piece, the first valve core is arranged close to the fixed iron; the second valve core is movably connected to the first valve core, and the second valve core can move together with the first valve core; the connecting piece is connected to the first valve core, the connecting piece includes an axial end limit part, and a preset gap is provided between the axial end limit part and the axial end of the first valve core to allow the second valve core to move axially relative to the first valve core, and the axial end limit part limits the second valve core to an extreme position moving away from the first valve core; the sealing piece is provided on the second valve core for sealing the outlet". When there is a large pressure at the inlet of the above-mentioned solenoid valve, the outlet can be opened without passing a large current into the drive coil, and the space required is small.

[0004] However, the following defects or problems still exist in combination with the existing technology:

[0005] (1) If Figure 11As shown, when high-pressure gas is introduced into the P port, in the first stage, the second valve core 20 is brought to the limit position by the first valve core 50 under the action of the sleeve 60. In the second stage, the spring 1 30 should continue to push the second valve core 20 to mechanically contact the first valve core 50. However, since the preload force of the spring 1 30 is too small, the pressure differential force on both sides of the second valve core 20 is greater than the preload force of the spring 1 30 when high-pressure gas is introduced into the P port. At this time, the second valve core 20 cannot be fully opened, the flow area is insufficient, and the flow rate cannot meet the requirements.

[0006] If the second valve core 20 is to be fully opened, the preload force of the spring 1 30 needs to be increased. However, the solenoid valve has a working condition where there is high pressure at port A and no pressure at port P. At this time, in order to ensure the sealing of the valve port, the preload force of the corresponding spring 2 40 must also be increased. Since the electromagnetic coil has a small arrangement space and cannot provide a large electromagnetic force, when the spring 2 40 is increased, the response time becomes slower and the opening current increases, which cannot meet the requirement of opening with a small current. In addition, due to the limitation of the arrangement space, a high-rigidity spring must be used to increase the spring force. Due to the tolerance of the parts themselves and the assembly tolerance, the initial preload force of the spring 2 40 will fluctuate greatly, resulting in poor product consistency.

[0007] (2) The popularity of electric vehicles has led to a continuous increase in the noise requirements of the entire vehicle, such as Figure 11 As shown, the conventional electromagnetic switch valve uses a buffer spring 70 for buffering, which may cause metal collision and generate high noise. Summary of the Invention

[0008] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a high-pressure switching valve.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] A high-pressure switching valve comprises a coil assembly, a magnetic isolation sleeve, a valve seat, and a valve bushing. The coil assembly is sleeved on the outside of the valve bushing, the magnetic isolation sleeve is fixedly sleeved on the inside of the valve bushing, the valve seat is fixedly connected to the top of the magnetic isolation sleeve, an inlet is formed on the outer wall of the magnetic isolation sleeve, an outlet is formed at the center of the valve seat, a fixed iron core is fixedly sleeved on the bottom of the magnetic isolation sleeve, a valve core assembly is placed inside the coil assembly, and a second spring is provided between the valve core assembly and the fixed iron core;

[0011] The valve core assembly includes a pilot valve core, the top outer wall of the pilot valve core is fixedly sleeved with a support sleeve, the top of the support sleeve is provided with an opening, the pilot valve core is slidingly sleeved with a magnetic isolation sleeve, the inside of the pilot valve core is slidingly sleeved with a connecting rod, the top of the connecting rod is fixedly connected with a sealing valve core, the sealing valve core is located outside the pilot valve core, the top of the sealing valve core is fixedly connected with a sealing rubber, the top of the sealing rubber extends to the outside of the support sleeve through the opening, the sealing rubber is used to seal the outlet, the outer wall of the sealing valve core is sleeved with a first spring, one end of the first spring is in contact with the outer wall of the sealing valve core, and the other end of the first spring is in contact with the top inner wall of the support sleeve.

[0012] Preferably, the coil assembly includes a magnetic cover, the interior of the magnetic cover is fixedly sleeved with a coil frame, the outer wall of the coil frame is fixedly sleeved with a conductive coil, the conductive coil is located between the magnetic cover and the coil frame, the bottom of the magnetic cover is fixedly sleeved with a magnetic gasket, and the magnetic gasket and the fixed iron core are sleeved with each other.

[0013] Preferably, the outer wall of the valve seat is fixedly connected to the top of the magnetic isolation sleeve by inlay injection molding, the bottom of the magnetic isolation sleeve is circumferentially welded to the outer wall of the fixed iron core, and the valve bushing is circumferentially welded to the outer wall of the magnetic isolation sleeve.

[0014] Preferably, the pilot valve core is made of magnetic conductive material, and the connecting rod and the sealing valve core are both made of magnetic isolation material.

[0015] Preferably, an assembly groove is provided on the top outer wall of the pilot valve core, and the support sleeve is interference-fitted with the pilot valve core through the assembly groove;

[0016] Breathing grooves are provided on both sides of the outer wall of the pilot valve core, and an avoidance groove is provided on the middle outer wall of the pilot valve core.

[0017] Preferably, the bottom of the pilot valve core is provided with an inner protrusion, and the bottom of the magnetic isolation sleeve is provided with an outer protrusion matching the inner protrusion.

[0018] Preferably, the pilot valve core is slidably sleeved with the magnetic isolation sleeve, a guide hole is provided inside the pilot valve core, and the connecting rod is slidably sleeved with the pilot valve core through the guide hole;

[0019] The guide hole is convex, the connecting rod is convex to match the guide hole, a connecting groove is provided on the lower surface of the sealing valve core, the top end of the connecting rod extends into the connecting groove, and the top end of the connecting rod is interference fit with the sealing valve core through the connecting groove.

[0020] Preferably, a clamping block is fixedly connected to the top of the sealing valve core, the sealing valve core and the clamping block are integrally formed, and the sealing rubber is inlaid and injected into the outer wall of the clamping block.

[0021] Preferably, a limiting groove is provided on the upper end surface of the fixed iron core, a limiting hole corresponding to the limiting groove is provided on the lower end surface of the pilot valve core, one end of the second spring is located in the limiting groove, and the other end of the second spring is located in the limiting hole.

[0022] Preferably, an annular groove is provided on the upper surface of the fixed iron core, and a buffer rubber ring is embedded in the annular groove on the upper surface of the fixed iron core.

[0023] The beneficial effects of the present invention are:

[0024] 1. In the present invention, the high-pressure switching valve makes the valve body structure simple and compact by improving the magnetic isolation sleeve, fixed iron core, and valve core assembly. While ensuring its function, the number of parts is optimized, the assembly steps are simplified, the production and equipment costs are reduced, and the production efficiency and assembly accuracy are improved.

[0025] 2. In the present invention, the high-pressure switching valve improves the valve core assembly by placing the first spring inside the valve core assembly, so that the sealing of the valve body is not related to the first spring. While ensuring that the sealing force remains unchanged, the preload force and stiffness of the second spring can be reduced, thereby improving its accuracy and meeting the requirements of greater pressure and flow.

[0026] 3. In the present invention, an annular groove is provided on the upper surface of the fixed iron core, and a buffer rubber ring is embedded in the annular groove on the upper surface of the fixed iron core. The use of the buffer rubber ring for limiting the position reduces the noise of the entire valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural schematic diagram of a high-pressure switching valve of the present invention.

[0028] Figure 2 This is a front view of a high-pressure switching valve of the present invention.

[0029] Figure 3 A high pressure switch valve of the present invention Figure 2 Cross-section of the BB.

[0030] Figure 4 It is a structural schematic diagram of a valve core assembly of a high-pressure switching valve of the present invention.

[0031] Figure 5 This is a front view of a valve core assembly of a high-pressure switching valve of the present invention.

[0032] Figure 6 This is a structural schematic diagram of a support sleeve of a high-pressure switching valve of the present invention.

[0033] Figure 7 The figure is a schematic structural diagram of a pilot valve core of a high-pressure switching valve of the present invention.

[0034] Figure 8 This is a cross-sectional view of a pilot valve core of a high-pressure switching valve of the present invention.

[0035] Figure 9 This is a structural schematic diagram of a fixed iron core and a buffer rubber ring of a high-pressure switching valve of the present invention.

[0036] Figure 10 The figure is a structural schematic diagram of a sealing valve core and a sealing rubber of a high-pressure switching valve of the present invention.

[0037] Figure 11 It is a structural diagram of a solenoid valve in the prior art in the background technology.

[0038] Numbers in the figure: 1. Coil assembly; 101. Magnetic cover; 102. Coil skeleton; 103. Conductive coil; 104. Magnetic gasket; 2. Magnetic isolation sleeve; 201. Inlet; 3. Valve seat; 301. Outlet; 4. Valve bushing; 5. Fixed iron core; 501. Limiting groove; 6. Pilot valve core; 601. Breathing groove; 602. Avoidance groove; 603. Assembly groove; 604. Inner protrusion; 605. Guide hole; 606. Limiting hole; 7. Connecting rod; 8. Sealing valve core; 801. Block; 802. Connecting groove; 9. Sealing rubber; 10. Support sleeve; 11. First spring; 12. Opening; 13. Buffer rubber ring; 14. Second spring. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0040] As attached Figure 1 To the attached Figure 10 As shown:

[0041] A high-pressure switching valve includes a coil assembly 1, a magnetic isolation sleeve 2, a valve seat 3, and a valve bushing 4. The coil assembly 1 is sleeved on the outside of the valve bushing 4, the magnetic isolation sleeve 2 is fixedly sleeved on the inside of the valve bushing 4, and the valve seat 3 is fixedly connected to the top of the magnetic isolation sleeve 2. An inlet 201 is defined on the outer wall of the magnetic isolation sleeve 2, and an outlet 301 is defined at the center of the valve seat 3. A fixed iron core 5 is fixedly sleeved on the bottom of the magnetic isolation sleeve 2. A valve core assembly is placed inside the coil assembly 1, and a second spring 14 is provided between the valve core assembly and the fixed iron core 5.

[0042] The valve core assembly includes a pilot valve core 6, the top outer wall of the pilot valve core 6 is fixedly sleeved with a support sleeve 10, the top of the support sleeve 10 is provided with an opening 12, the pilot valve core 6 is slidingly sleeved with the magnetic isolation sleeve 2, the inside of the pilot valve core 6 is slidingly sleeved with a connecting rod 7, the top of the connecting rod 7 is fixedly connected with a sealing valve core 8, the sealing valve core 8 is located outside the pilot valve core 6, the top of the sealing valve core 8 is fixedly connected with a sealing rubber 9, the top of the sealing rubber 9 extends to the outside of the support sleeve 10 through the opening 12, the sealing rubber 9 is used to seal the outlet 301, the outer wall of the sealing valve core 8 is sleeved with a first spring 11, one end of the first spring 11 is in contact with the outer wall of the sealing valve core 8, and the other end of the first spring 11 is in contact with the top inner wall of the support sleeve 10.

[0043] In the above technical solution, during operation, when the coil assembly 1 is not energized, the sealing rubber 9 closes the outlet 301 under the action of the spring force of the second spring 14 and the air pressure; when the coil assembly 1 is energized, the pilot valve core 6 moves downward under the action of the electromagnetic force. At this time, due to the air pressure difference at both ends, the sealing valve core 8 and the sealing rubber 9 remain in their original positions, and the sealing rubber 9 still closes the outlet 301. When the movement distance of the pilot valve core 6 reaches the maximum length of the preset gap a, the pilot valve core 6 continues to move downward, and the pilot valve core 6 will drive the sealing valve core 8 and the sealing rubber 9 to move downward through the connecting rod 7. At this time, the outlet 301 is opened to open the valve; at this time, the pressure difference at both ends of the sealing valve core 8 and the sealing rubber 9 decreases, and the first spring 11 resets the sealing valve core 8 until the lower surface of the sealing valve core 8 is in contact with the upper surface of the pilot valve core 6; when the coil assembly 1 is de-energized, the valve core assembly moves upward under the spring force of the second spring 14 to close the outlet 301.

[0044] It is worth mentioning that the high-pressure switching valve improves the valve core assembly by placing the first spring 11 inside the valve core assembly, so that the sealing of the valve body is not related to the first spring 11, and while ensuring that the sealing force remains unchanged, the preload force and stiffness of the second spring 14 can be reduced, thereby improving its accuracy and meeting the requirements of greater pressure and flow.

[0045] The coil assembly 1 includes a magnetic cover 101, the interior of the magnetic cover 101 is fixedly sleeved with a coil skeleton 102, the outer wall of the coil skeleton 102 is fixedly sleeved with a conductive coil 103, the conductive coil 103 is located between the magnetic cover 101 and the coil skeleton 102, and the bottom of the magnetic cover 101 is fixedly sleeved with a magnetic gasket 104, and the magnetic gasket 104 is sleeved with the fixed iron core 5.

[0046] The outer wall of the valve seat 3 is fixedly connected to the top of the magnetic isolation sleeve 2 by insert injection molding, the bottom of the magnetic isolation sleeve 2 is circumferentially welded to the outer wall of the fixed iron core 5, and the valve bushing 4 is circumferentially welded to the outer wall of the magnetic isolation sleeve 2.

[0047] The pilot valve core 6 is made of a magnetic conductive material, and the connecting rod 7 and the sealing valve core 8 are both made of a magnetic isolation material. A mounting groove 603 is provided on the top outer wall of the pilot valve core 6, and the support sleeve 10 is interference-fitted with the pilot valve core 6 through the mounting groove 603.

[0048] As attached Figure 7 As shown, breathing grooves 601 are provided on both sides of the outer wall of the pilot valve core 6 , and an avoidance groove 602 is provided on the middle outer wall of the pilot valve core 6 .

[0049] In the above technical solution, the breathing groove 601 is used for gas circulation;

[0050] Since the magnetic isolation sleeve 2 and the valve bushing 4 are welded together, after the magnetic isolation sleeve 2 and the valve bushing 4 are welded, in order to prevent the inner wall of the magnetic isolation sleeve 2 from being deformed after welding, which affects the movement of the pilot valve core 6 inside the magnetic isolation sleeve 2, an avoidance groove 602 is opened on the outer wall of the pilot valve core 6. The width distance of the avoidance groove 602 is b, and the distance b is much larger than the distance that the pilot valve core 6 needs to move.

[0051] As attached Figure 3 To the attached Figure 7 As shown, the bottom of the pilot valve core 6 is provided with an inner protrusion 604, and the bottom of the magnetic isolation sleeve 2 is provided with an outer protrusion matching the inner protrusion 604. The inner protrusion 604 is used to increase the attraction area to enhance the electromagnetic force.

[0052] As attached Figure 4 To the attached Figure 10 As shown, the pilot valve core 6 is slidably connected to the magnetic isolation sleeve 2, and a guide hole 605 is provided inside the pilot valve core 6. The connecting rod 7 is slidably connected to the pilot valve core 6 through the guide hole 605; the guide hole 605 is convex, and the connecting rod 7 is convex to match the guide hole 605. A connecting groove 802 is provided on the lower surface of the sealing valve core 8, and the top end of the connecting rod 7 extends into the connecting groove 802. The top end of the connecting rod 7 and the sealing valve core 8 are interference fit through the connecting groove 802.

[0053] It is worth mentioning that, as Figure 4 As shown, a preset gap a is reserved axially between the connecting rod 7 and the pilot valve core 6. The distance of the preset gap a is adjusted by the depth of the interference fit between the connecting rod 7 and the sealing valve core 8, thereby reducing assembly errors and improving assembly accuracy.

[0054] As attached Figure 10 As shown, a clamping block 801 is fixedly connected to the top of the sealing valve core 8 , the sealing valve core 8 and the clamping block 801 are integrally formed, and the sealing rubber 9 is inlaid and injected into the outer wall of the clamping block 801 .

[0055] In the above technical solution, through the design of the sealing valve core 8 and the sealing rubber 9, the sealing rubber 9 can be effectively fixed on the top of the sealing valve core 8 to prevent the sealing rubber 9 from falling off during operation.

[0056] As attached Figure 3 To the attached Figure 9 As shown, a limiting groove 501 is provided on the upper end surface of the fixed iron core 5, and a limiting hole 606 corresponding to the limiting groove 501 is provided on the lower end surface of the pilot valve core 6. One end of the second spring 14 is located in the limiting groove 501, and the other end of the second spring 14 is located in the limiting hole 606.

[0057] In the above technical solution, the top of the second spring 14 can be limited by the design of the limiting hole 606, and the bottom of the second spring 14 can be limited by the design of the limiting groove 501, thereby improving the stability of the valve body.

[0058] As attached Figure 9 As shown, an annular groove is formed on the upper surface of the fixed iron core 5 , and a buffer rubber ring 13 is embedded in the annular groove on the upper surface of the fixed iron core 5 .

[0059] In the above technical solution, through the design of the buffer rubber ring 13, the buffer rubber ring 13 is used for limiting and reducing the noise of the entire valve.

[0060] The specific usage and function of this embodiment are as follows:

[0061] When the present invention is in use, during operation, when the coil assembly 1 is not energized, the sealing rubber 9 closes the outlet 301 under the action of the spring force of the second spring 14 and the air pressure; when the coil assembly 1 is energized, the pilot valve core 6 moves downward under the action of the electromagnetic force. At this time, due to the air pressure difference at both ends, the sealing valve core 8 and the sealing rubber 9 remain in their original positions, and the sealing rubber 9 still closes the outlet 301 at this time. When the movement distance of the pilot valve core 6 reaches the maximum length of the preset gap a, the pilot valve core 6 continues to move downward, and the pilot valve core 6 will drive the sealing valve core 8 and the sealing rubber 9 to move downward through the connecting rod 7. At this time, the outlet 301 is opened to open the valve; at this time, the pressure difference at both ends of the sealing valve core 8 and the sealing rubber 9 decreases, and the first spring 11 resets the sealing valve core 8 until the lower surface of the sealing valve core 8 is in contact with the upper surface of the pilot valve core 6; when the coil assembly 1 is de-energized, the valve core assembly moves upward under the spring force of the second spring 14 to close the outlet 301.

[0062] The high-pressure switching valve has a simple and compact valve body structure through improvements to the magnetic isolation sleeve, fixed iron core, and valve core assembly. While ensuring its functionality, it optimizes the number of parts, simplifies assembly steps, reduces production and equipment costs, and improves production efficiency and assembly accuracy.

[0063] The high-pressure switch valve improves the valve core assembly, places the first spring 11 inside the valve core assembly, makes the sealing of the valve body not associated with the first spring 11, and can reduce the pre-tightening force and stiffness of the second spring 14 under the condition of ensuring the sealing force unchanged, improves the precision, and meets the demand of larger pressure and flow.

[0064] The above structure and process please refer to Figures 1-10 .

[0065] The installation method of the present application is as follows: firstly, the pilot valve core 6 and the sealing valve core 8 are assembled together through the connecting rod 7, the connecting rod 7 and the pilot valve core 6 are gap-fitted through the guide hole 605, and the connecting rod 7 and the sealing valve core 8 are interference-fitted through the connecting groove 802; secondly, the first spring 11 and the support sleeve 10 are sequentially assembled above the pilot valve core 6, the support sleeve 10 and the pilot valve core 6 are interference-fitted, and a valve core assembly is formed; then, the magnetic cover 101, the coil skeleton 102, the conductive coil 103, and the magnetic gasket 104 are assembled together to form a coil assembly 1; then, the valve core assembly, the second spring 14, and the fixed iron core 5 are sequentially assembled into the magnetic isolation sleeve 2, wherein the upper end of the magnetic isolation sleeve 2 is injection molded with the valve seat 3, the magnetic isolation sleeve 2 and the fixed iron core 5 are interference-fitted, and then the magnetic isolation sleeve 2 and the fixed iron core 5 are rotationally welded; then, the valve bushing 4 is sleeved on the outer circular surface of the magnetic isolation sleeve 2 at a suitable position, and the valve bushing 4 and the magnetic isolation sleeve 2 are fixed by circumferential welding; finally, the assembled valve body assembly is sleeved in the coil assembly 1, and the installation of the present application is completed.

[0066] The above structure and process please refer to Figures 1-10 .

[0067] The above, only for the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the technical field according to the technical range disclosed by the present application and the invention concept of the present application, equivalent replacement or change, should be covered in the protection scope of the present application.

Claims

1. A high-pressure switching valve, comprising a coil assembly (1), a magnetic isolation sleeve (2), a valve seat (3), and a valve bushing (4), characterized in that: The coil assembly (1) is sleeved on the outside of the valve bushing (4), the magnetic isolation sleeve (2) is fixedly sleeved on the inside of the valve bushing (4), the valve seat (3) is fixedly connected to the top of the magnetic isolation sleeve (2), an inlet (201) is provided on the outer wall of the magnetic isolation sleeve (2), an outlet (301) is provided at the center of the valve seat (3), a fixed iron core (5) is fixedly sleeved on the bottom of the magnetic isolation sleeve (2), a valve core assembly is placed inside the coil assembly (1), and a second spring (14) is provided between the valve core assembly and the fixed iron core (5); The valve core assembly includes a pilot valve core (6), the top outer wall of the pilot valve core (6) is fixedly sleeved with a support sleeve (10), the top of the support sleeve (10) is provided with an opening (12), the pilot valve core (6) is slidably sleeved with the magnetic isolation sleeve (2), the interior of the pilot valve core (6) is slidably sleeved with a connecting rod (7), the top of the connecting rod (7) is fixedly connected with a sealing valve core (8), the sealing valve core (8) is located outside the pilot valve core (6), the top of the sealing valve core (8) is fixedly connected with a sealing rubber (9), the top of the sealing rubber (9) extends to the outside of the support sleeve (10) through the opening (12), the sealing rubber (9) is used to block the outlet (301), the outer wall of the sealing valve core (8) is sleeved with a first spring (11), one end of the first spring (11) contacts the outer wall of the sealing valve core (8), and the other end of the first spring (11) contacts the top inner wall of the support sleeve (10); The pilot valve core (6) is made of magnetic conductive material, and the connecting rod (7) and the sealing valve core (8) are both made of magnetic isolation material; An annular groove is formed on the upper surface of the fixed iron core (5), and a buffer rubber ring (13) is embedded in the annular groove on the upper surface of the fixed iron core (5); A preset gap a is reserved axially between the connecting rod (7) and the pilot valve core (6), and the distance of the preset gap a is adjusted by the depth of the interference fit between the connecting rod (7) and the sealing valve core (8).

2. A high pressure switching valve according to claim 1, characterized in that: The coil assembly (1) comprises a magnetic cover (101), the interior of the magnetic cover (101) is fixedly sleeved with a coil frame (102), the outer wall of the coil frame (102) is fixedly sleeved with a conductive coil (103), the conductive coil (103) is located between the magnetic cover (101) and the coil frame (102), the bottom of the magnetic cover (101) is fixedly sleeved with a magnetic washer (104), and the magnetic washer (104) and the fixed iron core (5) are sleeved with each other.

3. A high pressure switching valve according to claim 1, characterized in that: The outer wall of the valve seat (3) is fixedly connected to the top of the magnetic isolation sleeve (2) by inlay injection molding, the bottom of the magnetic isolation sleeve (2) is circumferentially welded to the outer wall of the fixed iron core (5), and the valve bushing (4) is circumferentially welded to the outer wall of the magnetic isolation sleeve (2).

4. A high pressure switching valve according to claim 1, characterized in that: An assembly groove (603) is provided on the top outer wall of the pilot valve core (6), and the support sleeve (10) is interference-fitted with the pilot valve core (6) through the assembly groove (603); Breathing grooves (601) are provided on both sides of the outer wall of the pilot valve core (6), and an avoidance groove (602) is provided on the middle outer wall of the pilot valve core (6).

5. The high-pressure switching valve according to claim 1, characterized in that: The bottom of the pilot valve core (6) is provided with an inner protrusion (604), and the bottom of the magnetic isolation sleeve (2) is provided with an outer protrusion matching the inner protrusion (604).

6. The high-pressure switching valve according to claim 1, characterized in that: The pilot valve core (6) is slidably sleeved with the magnetic isolation sleeve (2); a guide hole (605) is provided inside the pilot valve core (6); and the connecting rod (7) is slidably sleeved with the pilot valve core (6) through the guide hole (605); The guide hole (605) is convex, the connecting rod (7) is convex to match the guide hole (605), a connecting groove (802) is provided on the lower surface of the sealing valve core (8), the top end of the connecting rod (7) extends into the connecting groove (802), and the top end of the connecting rod (7) and the sealing valve core (8) are interference-fitted through the connecting groove (802).

7. The high-pressure switching valve according to claim 1, characterized in that: The top of the sealing valve core (8) is fixedly connected to a clamping block (801), the sealing valve core (8) and the clamping block (801) are integrally formed, and the sealing rubber (9) is embedded and injected into the outer wall of the clamping block (801).

8. The high-pressure switching valve according to claim 1, characterized in that: The upper end surface of the fixed iron core (5) is provided with a limiting groove (501), the lower end surface of the pilot valve core (6) is provided with a limiting hole (606) corresponding to the limiting groove (501), one end of the second spring (14) is located in the limiting groove (501), and the other end of the second spring (14) is located in the limiting hole (606).

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