High-temperature-resistant electromagnetic valve with valve sleeve structure

Abstract

The utility model relates to the technical field of electromagnetic valve structures, in particular to a high-temperature-resistant electromagnetic valve with a valve sleeve structure, which comprises a valve body, a main valve component, two pilot valve components and an electromagnetic coil, the main valve component comprises a valve sleeve and a valve rod, and piston heads are arranged at two end parts, extending out of the valve sleeve, of the valve rod; the two pilot valve assemblies are arranged at the ends of the valve body respectively and provided with a control cavity for containing the piston head and a second gas circuit communicated with the first gas circuit and the control cavity, and the first gas circuit and the second gas circuit form a pilot gas circuit. The electromagnetic coil is used for controlling a movable iron core of the pilot valve assembly to move; an outer sealing structure is arranged on the contact face of the valve sleeve and the inner wall of the valve body cavity, the valve sleeve and the valve rod are made of alloy steel materials or ceramic composite materials, the valve sleeve and the valve rod are in sliding fit to form hard sealing, a soft sealing ring does not need to be used, the frequency that the sealing ring needs to be replaced due to aging and damage is reduced, the shutdown maintenance time is shortened, and the service life is prolonged. The method is suitable for industrial scenes difficult to overhaul frequently.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic valve structure technology, and in particular to a high-temperature resistant electromagnetic valve with a valve sleeve structure. Background Technology

[0002] Solenoid directional valves are a common fluid control element. Their pilot section is usually normally closed. When the power is off, the pilot section is closed. When the power is applied, the pilot gas opens, which in turn pushes the solenoid valve stem to achieve the reversing action, thereby controlling the flow direction of the fluid.

[0003] However, when the solenoid directional valve operates in a high-temperature environment, the soft sealing ring on the contact surface between the valve stem and the valve sleeve will be affected by the high temperature, causing the sealing ring to fail. This will affect the sealing effect of the entire solenoid directional valve. In addition, due to the failure of the seal, frequent shutdowns are required to replace the sealing ring, which increases the downtime for maintenance and seriously affects the normal operating time of the equipment. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a high-temperature resistant solenoid valve with a valve sleeve structure, which effectively solves the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a high-temperature resistant solenoid valve with a valve sleeve structure, comprising:

[0006] The valve body is provided with an air inlet, two exhaust ports, two working ports, and a first air passage connecting the air inlet;

[0007] The main valve assembly includes a valve sleeve fixed in the valve body and a valve stem coaxially disposed in the valve sleeve, wherein piston heads are provided at both ends of the valve stem extending out of the valve sleeve;

[0008] Two pilot valve assemblies are respectively disposed at the ends of the valve body, each having a control chamber for accommodating the piston head and a second air passage connecting the first air passage and the control chamber, wherein the first air passage and the second air passage form a pilot air passage.

[0009] An electromagnetic coil is provided corresponding to the pilot valve assembly and is used to control the movement of the moving iron core of the pilot valve assembly;

[0010] The valve sleeve and the inner wall of the valve body cavity are provided with an external sealing structure. The valve sleeve and the valve stem are made of alloy steel or ceramic composite material. The valve sleeve and the valve stem slide together to form a hard seal.

[0011] Furthermore, the pilot valve assembly includes a pilot seat and a pilot assembly, the pilot seat being fixedly connected to the valve body, and the pilot assembly being disposed within the pilot seat;

[0012] The pilot seat is provided with a first passage communicating with the control cavity and a converging cavity communicating with the first passage and the pilot air passage;

[0013] The pilot assembly includes a stationary iron core and a moving iron core. The end of the moving iron core facing the pilot seat is provided with a sealing head. The electromagnetic coil controls the moving iron core to move towards or away from the inlet of the first passage, so as to realize the closing or opening of the control cavity by the sealing head.

[0014] Furthermore, the sliding contact surface between the valve sleeve and the valve body is provided with a plurality of annular protrusions along the axial direction;

[0015] The annular protrusion is provided with a first sealing ring, and the plurality of annular protrusions having the first sealing ring form the outer sealing structure.

[0016] Furthermore, the first sealing ring is made of a high-temperature resistant material.

[0017] Furthermore, the air inlet and the air inlet end of the first air passage are located in the same radial section, and an annular groove is provided on the inner wall of the valve body corresponding to the air inlet, and the annular grooves of the two form an air supply ring groove.

[0018] Furthermore, the valve sleeve is provided with through holes in the radial direction at the positions of the air inlet and the exhaust port corresponding to the valve body;

[0019] The valve stem is provided with a connecting groove along the axial direction to connect two adjacent through hole groups.

[0020] Furthermore, a guide sleeve is provided inside the control cavity;

[0021] The guide sleeve extends towards the center at one end near the valve body to form a limiting edge.

[0022] Furthermore, the electromagnetic coil is made of high-temperature resistant insulating material and is wrapped with a metal heat sink.

[0023] Furthermore, the piston head is provided with a second sealing ring, which is made of a high-temperature resistant material.

[0024] Furthermore, the pilot valve assembly also includes a manual adjustment rod, one end of which extends into the pilot valve assembly and abuts against the end of the moving iron core away from the stationary iron core.

[0025] The beneficial effects of this utility model are as follows: The valve sleeve and valve stem are made of alloy steel or ceramic composite material, which has low friction and high temperature resistance, and can achieve a hard seal between the spacer and the valve stem. There is no need to use soft sealing rings, which reduces the frequency of replacement due to aging and damage of sealing rings, reduces downtime maintenance time, and is suitable for industrial scenarios where frequent maintenance is difficult. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of the high-temperature resistant solenoid valve with a valve sleeve structure in this utility model;

[0027] Figure 2 This is a schematic diagram of the pilot gas path distribution in this utility model;

[0028] Figure 3 This is a schematic diagram of the structure of the valve stem and valve sleeve in this utility model;

[0029] Figure 4 This is a schematic diagram showing the gas entering the converging cavity through the second gas path in this utility model;

[0030] Figure 5 This is a schematic diagram of the gas in the gathering cavity entering the control cavity through the first passage in this utility model.

[0031] Reference numerals: 1. Valve body; 1a. Inlet; 1b. Outlet; 1c. Working port; 1d. First air passage; 2. Main valve assembly; 21. Valve sleeve; 211. Annular protrusion; 212. Through hole group; 22. Valve stem; 221. Annular groove; 23. Piston head; 3. Pilot valve assembly; 3a. Control chamber; 3b. Second air passage; 3c. First passage; 3d. Converging chamber; 31. Pilot seat; 32. Pilot assembly; 321. Stationary iron core; 322. Moving iron core; 4. Electromagnetic coil; 5. Guide sleeve; 51. Limiting edge; 6. Manual adjustment rod. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0033] like Figures 1 to 5 The high-temperature resistant solenoid valve with valve sleeve structure shown includes: valve body 1, main valve assembly 2, two pilot valve assemblies 3 and solenoid coil 4; the valve body 1 is provided with an air inlet 1a, two exhaust ports 1b, two working ports 1c and a first air passage 1d connecting the air inlet 1a;

[0034] The main valve assembly 2 includes a valve sleeve 21 fixed inside the valve body 1 and a valve stem 22 coaxially disposed inside the valve sleeve 21. The valve stem 22 has piston heads 23 at both ends extending out of the valve sleeve 21.

[0035] Two pilot valve assemblies 3 are respectively disposed at the ends of the valve body 1, having a control chamber 3a for accommodating the piston head 23 and a second air passage 3b connecting the first air passage 1d and the control chamber 3a, the first air passage 1d and the second air passage 3b forming a pilot air passage;

[0036] The electromagnetic coil 4 is set to the pilot valve assembly 3 and is used to control the movement of the moving iron core 322 of the pilot valve assembly 3 to realize the connection between the control chamber 3a and the pilot air passage, so that the valve stem 22 will produce linear movement.

[0037] The valve sleeve 21 and the inner wall of the valve body 1 cavity are provided with an external sealing structure. The valve sleeve 21 and the valve stem 22 are made of alloy steel or ceramic composite material. The valve sleeve 21 and the valve stem 22 slide together to form a hard seal.

[0038] Specifically, an air inlet 1a, two exhaust ports 1b, and two working ports 1c are provided on the valve body 1. The air inlet 1a and the two exhaust ports are located on the same side of the valve body 1, while the two working ports 1c are located on one side. In the initial state, the electromagnetic coil 4 is not energized, the pilot valve assembly 3 is in the closed state, the control chamber 3a is connected to the atmosphere through the pilot valve exhaust port 1b, there is no air pressure inside, and the valve stem 22 remains in the initial position. After the electromagnetic coil 4 is energized, it generates a magnetic force to attract the moving iron core 322 of the pilot valve assembly 3, opening the pilot air passage. Compressed air enters the control chamber 3a through the pilot air passage, pushing the piston head 23 to move. The valve stem 22 overcomes the friction force to generate displacement, changing the state of the main air passage.

[0039] In the specific implementation process, such as Figure 1 As shown, when the electromagnetic coil 4 at the left end is energized, it generates a magnetic force, pushing the valve stem 22 to the right position. Compressed air enters from the inlet 1a and flows to the left working port 1c, pushing the piston head 23 of the external actuator to move in a certain direction. The gas on the other side of the actuator flows through the right working port 1c to the right exhaust port 1b and is discharged. When the electromagnetic coil 4 at the right end is energized, it generates a magnetic force, and the valve stem 22 moves to the left position. Compressed air enters from the inlet 1a and flows to the right working port 1c, pushing the piston head 23 of the actuator to move in the opposite direction. The gas of the actuator flows through the left working port 1c to the left exhaust port 1b and is discharged. It should be noted that the determination of the left and right sides of the electromagnetic coil 4, working port 1c, and exhaust port 1b is based on... Figure 1 The position of the middle part relative to the exhaust port 1b is determined.

[0040] In this invention, the valve sleeve 21 and valve stem 22 are made of alloy steel or ceramic composite material, which has low friction and high temperature resistance, and can achieve a hard seal between the sleeve and the valve stem 22. In this embodiment, both sides of the sealing pair are metal or other hard materials, eliminating the need for soft sealing rings, reducing the frequency of replacement due to aging or damage of the sealing rings, reducing downtime for maintenance, and making it suitable for industrial scenarios where frequent maintenance is difficult.

[0041] In this utility model, the pilot valve assembly 3 includes a pilot seat 31 and a pilot assembly 32. The pilot seat 31 is fixedly connected to the valve body 1, and the pilot assembly 32 is disposed inside the pilot seat 31. The pilot seat 31 is provided with a first passage 3c that communicates with the control chamber 3a and a converging chamber 3d that communicates with the first passage 3c and the pilot air passage. The converging chamber 3d can converge and distribute the compressed air from the pilot air passage, so that the airflow enters the first passage 3c more evenly and then enters the control chamber 3a, ensuring that the air pressure distribution of the piston head 23 in the control chamber 3a is uniform, reducing the phenomenon of unstable movement of the piston head 23 caused by uneven airflow, and improving the response speed and action accuracy of the solenoid valve.

[0042] The pilot assembly 32 includes a stationary iron core 321 and a moving iron core 322. The end of the moving iron core 322 facing the pilot seat 31 is provided with a sealing head. The electromagnetic coil 4 controls the moving iron core 322 to move towards or away from the inlet of the first passage 3c, so as to realize the sealing head closing or opening the control cavity 3a.

[0043] During implementation, in the initial state, the control chamber 3a is reliably closed by the tight cooperation between the sealing head and the inlet of the first passage 3c. When the electromagnetic coil 4 on one side of the valve body 1 is energized, the control chamber 3a on the same side is in the open state, the pilot air passage is connected to the control chamber 3a, and the movement of the valve stem 22 can realize the reversing action of the solenoid valve. Specifically, the gas in the inlet 1a flows through the pilot air passage formed by the first air passage 1d and the second air passage 3b, enters the converging chamber 3d, enters the control chamber 3a through the first passage 3c, and uses pressure to push the valve stem 22 to move to the other side.

[0044] like Figure 1 and Figure 3As shown, multiple annular protrusions 211 are provided axially on the sliding contact surface between the valve sleeve 21 and the inner wall of the valve body 1; a first sealing ring is provided on each annular protrusion 211, and the multiple annular protrusions 211 with the first sealing ring form an external sealing structure. In high-temperature environments, by setting multiple annular protrusions 211, the fit clearance between components may change due to the thermal expansion of the material, maintaining stable sealing and movement performance. Furthermore, each annular protrusion 211 is provided with a first sealing ring, forming a multi-point sealing structure. Even if one sealing ring experiences slight wear or aging, the other sealing rings can still maintain their sealing effect, thereby improving the overall sealing performance.

[0045] Preferably, the first sealing ring is made of a high-temperature resistant material. The sealing performance between the valve body 1 and the valve sleeve 21 can remain stable under high temperature fluctuations, ensuring the reliable operation of the solenoid valve.

[0046] In the preferred embodiment of this utility model, the air inlet 1a and the air inlet end of the first air passage 1d are located on the same radial section, and annular grooves 221 are provided on the inner wall of the valve body 1 corresponding to the air inlet 1a. The annular grooves 221 of the two form an air supply ring groove. The setting of the air supply ring groove ensures that the pilot air passage is always in an air supply state, so that the solenoid valve can respond more quickly to the energizing and de-energizing signals of the solenoid coil 4, thereby improving the switching speed.

[0047] In the preferred embodiment, the valve sleeve 21 is provided with through-hole groups 212 radially at positions corresponding to the air inlet 1a and exhaust port 1b of the valve body 1; the valve stem 22 is provided with a connecting groove axially connecting two adjacent through-hole groups 212. The setting of the connecting groove ensures that the airflow can flow from one through-hole group 212 to another through-hole group 212 during the movement of the valve stem 22, so that the solenoid valve can complete the air path switching more quickly when switching, thereby improving the system response speed.

[0048] In this invention, a guide sleeve 5 is provided inside the control cavity 3a; the end of the guide sleeve 5 closest to the valve body 1 extends towards the center to form a limiting edge 51. The guide sleeve 5 provides precise guidance for the piston head 23, ensuring that the piston head 23 moves smoothly along the axial direction within the control cavity 3a, reducing offset and sway, and ensuring the accuracy and reliability of the reversing action; while the limiting edges 51 on both sides abut against the two ends of the valve sleeve 21, limiting the axial displacement of the valve sleeve 21, and preventing the piston head 23 from excessively displacing during movement, avoiding collision between the piston head 23 and the inner wall of the control cavity 3a, thereby protecting the structural integrity of the piston head 23 and the control cavity 3a. In addition, a high-temperature resistant sealing ring is provided on the outer cylindrical contact surface between the guide sleeve 5 and the control cavity 3a, effectively preventing gas leakage from the control cavity 3a along the contact surface between the guide sleeve 5 and the outer cylindrical contact surface of the control cavity 3a, ensuring stable gas pressure within the control cavity 3a.

[0049] Preferably, the electromagnetic coil 4 is made of high-temperature resistant insulating material and is wrapped with a metal heat sink.

[0050] Selecting suitable high-temperature resistant insulating materials to fabricate the electromagnetic coil 4 ensures that the coil maintains good electrical insulation performance in high-temperature environments. High-temperature resistant insulating materials can include polyimide film or mica tape, etc. The heat dissipation sleeve can be made of materials with good thermal conductivity, such as aluminum or copper, ensuring rapid heat conduction and dissipation. This heat dissipation and insulation structure provides dual protection for the electromagnetic coil 4, extending its service life and reducing maintenance workload and costs.

[0051] In this design, a second sealing ring is provided on the piston head 23, which is made of high-temperature resistant material. The second sealing ring is in close contact with the valve sleeve 21, and works in conjunction with the guide sleeve 5 and the limiting edge 51 to ensure the stable operation of the solenoid valve in a high-temperature environment and guarantee the reliability of the switching action.

[0052] In another preferred embodiment, the pilot valve assembly 3 also includes a manual adjustment lever 6, one end of which extends into the pilot valve assembly 3 and abuts against the end of the moving iron core 322 furthest from the stationary iron core 321. In cases requiring rapid response or manual intervention, the operator can quickly control the opening and closing of the solenoid valve via the manual adjustment lever 6, ensuring normal system operation and reducing downtime due to automatic control failure.

[0053] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. A high-temperature resistant solenoid valve with a valve sleeve structure, characterized in that, include: The valve body (1) is provided with an air inlet (1a), two exhaust ports (1b), two working ports (1c) and a first air passage (1d) connecting the air inlet (1a); The main valve assembly (2) includes a valve sleeve (21) fixed inside the valve body (1) and a valve stem (22) coaxially arranged inside the valve sleeve (21). The valve stem (22) has piston heads (23) at both ends extending out of the valve sleeve (21). Two pilot valve assemblies (3) are respectively disposed at the ends of the valve body (1), having a control chamber (3a) for accommodating the piston head (23) and a second air passage (3b) connecting the first air passage (1d) and the control chamber (3a), wherein the first air passage (1d) and the second air passage (3b) form a pilot air passage; An electromagnetic coil (4) is provided corresponding to the pilot valve assembly (3) and is used to control the movement of the moving iron core (322) of the pilot valve assembly (3); The valve sleeve (21) and the inner wall of the valve body (1) are provided with an external sealing structure. The valve sleeve (21) and the valve stem (22) are made of alloy steel or ceramic composite material. The valve sleeve (21) and the valve stem (22) slide together to form a hard seal.

2. The high-temperature resistant solenoid valve with valve sleeve structure according to claim 1, characterized in that, The pilot valve assembly (3) includes a pilot seat (31) and a pilot assembly (32). The pilot seat (31) is fixedly connected to the valve body (1), and the pilot assembly (32) is disposed inside the pilot seat (31). The pilot seat (31) is provided with a first passage (3c) communicating with the control cavity (3a) and a converging cavity (3d) communicating with the first passage (3c) and the pilot gas passage; The pilot assembly (32) includes a stationary iron core (321) and a moving iron core (322). The moving iron core (322) has a sealing head at one end facing the pilot seat (31). The electromagnetic coil (4) controls the moving iron core (322) to move toward the inlet of the first passage (3c) to realize the closing or opening of the control cavity (3a) by the sealing head.

3. The high-temperature resistant solenoid valve with valve sleeve structure according to claim 1, characterized in that, The valve sleeve (21) and the valve body (1) have multiple annular protrusions (211) along the axial direction on their sliding contact surfaces. The annular protrusion (211) is provided with a first sealing ring, and the plurality of annular protrusions (211) having the first sealing ring form the outer sealing structure.

4. The high-temperature resistant solenoid valve with valve sleeve structure according to claim 3, characterized in that, The first sealing ring is made of a high-temperature resistant material.

5. The high-temperature resistant solenoid valve with valve sleeve structure according to claim 1, characterized in that, The air inlet (1a) and the air inlet end of the first air passage (1d) are located in the same radial section, and an annular groove (221) is provided on the inner wall of the valve body (1) corresponding to the air inlet (1a), and the annular groove (221) of both forms an air supply ring groove.

6. The high-temperature resistant solenoid valve with valve sleeve structure according to claim 1, characterized in that, The valve sleeve (21) is provided with through holes (212) in the radial direction at the positions of the air inlet (1a) and the exhaust port (1b) of the valve body (1); The valve stem (22) is provided with a connecting groove along the axial direction to connect two adjacent through hole groups (212).

7. The high-temperature resistant solenoid valve with valve sleeve structure according to claim 1, characterized in that, The control cavity (3a) is provided with a guide sleeve (5); The guide sleeve (5) extends toward the center from one end near the valve body (1) to form a limiting edge (51).

8. The high-temperature resistant solenoid valve with valve sleeve structure according to claim 1, characterized in that, The electromagnetic coil (4) is made of high-temperature resistant insulating material and is wrapped with a heat dissipation sleeve.

9. The high-temperature resistant solenoid valve with valve sleeve structure according to claim 1, characterized in that, The piston head (23) is provided with a second sealing ring, which is made of high temperature resistant material.

10. The high-temperature resistant solenoid valve with valve sleeve structure according to claim 2, characterized in that, The pilot valve assembly (3) also includes a manual adjustment rod (6), one end of which extends into the pilot valve assembly (3) and abuts against the end of the moving iron core (322) away from the stationary iron core (321).

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