Piston type electromagnetic valve

Abstract

The utility model relates to the technical field of electromagnetic valves, in particular to a piston type electromagnetic valve which is characterized in that a valve seat is arranged at a position corresponding to a valve port of a valve body; the valve core assembly is arranged between the valve seat assembly and the valve port; the magnetic driving assembly comprises a static iron core, a movable iron core and a first elastic piece; the movable iron core is provided with a first step shaft and a second step shaft, the valve seat is provided with a through hole for the movable iron core to penetrate through, the through hole extends out of a first guide sleeve in the axial direction, the first guide sleeve is embedded into the first step shaft, and a sleeve is arranged on the outer side of the guide sleeve. The end, located on the valve element assembly, of the through hole is provided with an abutting edge, the inner edge of the abutting edge extends out of a second guide sleeve, and the second guide sleeve is embedded into the second step shaft. Through the first guide sleeve and the second guide sleeve, it is ensured that the movable iron core keeps good centering performance when moving in the sleeve, it is ensured that the piston head is evenly stressed, the clamping stagnation phenomenon is effectively avoided, and the working stability of the electromagnetic valve is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of solenoid valves, in particular to a piston type solenoid valve. Background Art

[0002] The piston solenoid valve is a common electromagnetic control device that controls the movement of the piston through electromagnetic force, thereby achieving control of the fluid medium.

[0003] In the prior art, a piston-type solenoid valve includes a piston seat, a piston head disposed inside the piston seat, a moving iron core and a stationary iron core located above the piston head, and an elastic member located between the moving iron core and the stationary iron core. A sleeve is provided on the outside of the stationary iron core and the moving iron core, and the moving iron core is provided through the piston seat. When no power is applied, the elastic force of the elastic member acts on the moving iron core to drive the piston head to close the valve port.

[0004] However, since the end of the sleeve is embedded in the center hole of the piston seat, the moving iron core slides in the sleeve. When the moving iron core moves in the sleeve, it is difficult to ensure the centering of the moving iron core. The piston head will be unevenly stressed, resulting in jamming, which seriously affects the normal operation of the solenoid valve. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a piston type solenoid valve to effectively solve the problems in the background technology.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a piston type solenoid valve, comprising:

[0007] The valve seat is arranged at a position corresponding to the valve port of the valve body;

[0008] A valve core assembly is placed between the valve seat assembly and the valve port;

[0009] A magnetic drive assembly is provided above the valve seat assembly, comprising a static iron core, a movable iron core and a first elastic member, and is used to drive the valve core assembly to close the valve port;

[0010] The movable iron core is provided with a first stepped shaft and a second stepped shaft, the diameter of the first stepped shaft is larger than the diameter of the second stepped shaft, a through hole for the movable iron core to pass through is provided at the center of the valve seat, a first guide sleeve is extended axially from the through hole toward the magnetic drive assembly, the first guide sleeve is embedded in the first stepped shaft, and a sleeve is provided on the outside of the guide sleeve;

[0011] The through hole is located at one end of the valve core assembly and is provided with an abutting edge. The inner edge of the abutting edge extends a second guide sleeve toward the static iron core, and the second guide sleeve is embedded in the second stepped shaft.

[0012] Furthermore, the valve seat is connected to the valve body via threads, and a first sealing ring is provided at the end of the threaded connection shaft section.

[0013] Furthermore, the valve seat is provided with a connecting flange, and the valve body is provided with a stepped hole for embedding the connecting flange;

[0014] A second sealing ring is provided on the step surface of the step hole.

[0015] Furthermore, the valve core assembly includes a piston body, a sealing structure arranged on the outer cylindrical surface of the piston body, and a second elastic member arranged between the piston body and the valve port.

[0016] Furthermore, a first buffer pad and a second buffer pad are provided at both ends of the piston body;

[0017] The first buffer pad can abut against the movable iron core, and the second buffer pad can abut against the valve port of the valve body.

[0018] Furthermore, a trapezoidal groove is provided on a side of the static iron core facing the movable iron core, and the movable iron core is provided with a trapezoidal protrusion that cooperates with the trapezoidal groove;

[0019] A cylindrical hole is provided at the center axis of the trapezoidal protrusion, and the first elastic member is embedded in the cylindrical hole.

[0020] Furthermore, a first step groove is provided on the outer cylindrical surface of the first guide sleeve, and a second step groove is provided on the outer cylindrical surface of the static iron core;

[0021] Both ends of the sleeve are respectively arranged in the first step groove and the second step groove.

[0022] Furthermore, a buffer groove is provided on the cylindrical surface where the first step groove contacts the sleeve.

[0023] Furthermore, a balancing groove is provided along the circumference of the shaft section of the moving iron core close to the static iron core.

[0024] Furthermore, a push rod is provided on the end surface of the moving iron core facing the valve core assembly, and a conical surface is provided on the end of the push rod.

[0025] The beneficial effects of the present invention are as follows: the present invention can ensure that the moving iron core maintains good concentricity when moving in the sleeve through the use of the first guide sleeve and the second guide sleeve, reduce the problem of uneven force on the piston head caused by different positioning center references, effectively avoid sticking, and improve the working stability of the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a cross-sectional view of the overall structure of the piston-type solenoid valve in the embodiment of the present utility model;

[0028] Figure 2 This is a partial structural sectional view of a piston-type solenoid valve in an embodiment of the present utility model;

[0029] Figure 3 This is a schematic structural diagram of the first guide sleeve in an embodiment of the present utility model;

[0030] Figure 4 This is a schematic structural diagram of the valve seat in an embodiment of the present utility model;

[0031] Figure 5 Schematic diagram of the structure of the moving iron core in the embodiment of the present utility model.

[0032] Figure markings: 1. valve seat; 11. through hole; 12. first guide sleeve; 121. first step groove; 122. buffer groove; 13. abutment edge; 14. second guide sleeve; 15. connecting flange; 2. valve core assembly; 21. piston body; 21a. first buffer pad; 21b. second buffer pad; 22. sealing structure; 23. second elastic member; 3. magnetic drive assembly; 31. static iron core; 32. moving iron core; 32a. first step shaft; 32b. second step shaft; 33. first elastic member; 34. balancing groove; 35. push rod; 4. sleeve; 5. first sealing ring; 6. second sealing ring. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely 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.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] like Figures 1 to 5 The piston-type solenoid valve shown in the figure includes: a valve seat 1, a valve core assembly 2, and a magnetic drive assembly 3. The valve seat 1 is arranged at a position corresponding to the valve port of the valve body; the valve core assembly 2 is positioned between the valve seat 1 assembly and the valve port; the magnetic drive assembly 3 is arranged above the valve seat 1 assembly and includes a static iron core 31, a movable iron core 32, and a first elastic member 33, which is used to drive the valve core assembly 2 to close the valve port.

[0037] The movable iron core 32 is provided with a first stepped shaft 32a and a second stepped shaft 32b. The diameter of the first stepped shaft 32a is larger than that of the second stepped shaft 32b. A through hole 11 is provided at the center of the valve seat 1 for the movable iron core 32 to pass through. A first guide sleeve 12 extends axially from the through hole 11 toward the magnetic drive assembly 3. The first guide sleeve 12 is embedded in the first stepped shaft 32a. A sleeve 4 is provided on the outside of the guide sleeve.

[0038] An abutting edge 13 is provided at one end of the through hole 11 located at the valve core assembly 2 . A second guide sleeve 14 extends from the inner edge of the abutting edge 13 toward the static iron core 31 . The second guide sleeve 14 is embedded in the second stepped shaft 32 b .

[0039] By using the first guide sleeve 12 and the second guide sleeve 14, it is possible to ensure that the moving iron core 32 maintains good centering when moving in the sleeve 4, reducing the problem of uneven force on the piston head caused by different positioning center references, effectively avoiding sticking, and improving the working stability of the solenoid valve.

[0040] In the present invention, the valve seat 1 is connected to the valve body via threads to ensure the reliability of the connection between the valve seat 1 and the valve body, and a first sealing ring 5 is provided at the end of the threaded connection shaft section to reduce the impact of the medium on the threaded structure and improve the sealing effect.

[0041] In the preferred embodiment of the present invention, the valve seat 1 is provided with a connecting flange 15, and the valve body is provided with a step hole for the connecting flange 15 to be embedded; and a second sealing ring 6 is provided on the step surface of the step hole to form an end face seal, further enhancing the sealing effect.

[0042] The valve core assembly 2 in the present invention includes a piston body 21 , a sealing structure 22 provided on the outer cylindrical surface of the piston body 21 , and a second elastic member 23 provided between the piston body 21 and the valve port.

[0043] The sealing structure 22 and the second elastic member 23 can improve the sealing performance of the valve and reduce the risk of leakage. When the valve is closed quickly, the second elastic member 23 can absorb the impact force, reduce damage to the valve seat 1 and the sealing structure 22, and extend the service life. For the normally closed solenoid valve, after power is turned on, the piston body 21 loses the driving force of the moving iron core 32. At this time, the second elastic member 23 can also help the piston body 21 to reset quickly, thereby improving the response speed of the valve.

[0044] Based on the above solution, first and second cushions 21a, 21b are provided at each end of the piston body 21. The first cushion 21a abuts the movable iron core 32, while the second cushion 21b abuts the valve opening of the valve body. The first and second cushions 21a, 21b provide a certain degree of elasticity, decelerating the piston as it approaches the closed position. This absorbs the impact force of the piston body 21 during movement and reduces the noise and vibration caused by the piston body 21 rapidly impacting the movable iron core 32 or the valve opening of the valve body.

[0045] In the preferred embodiment of the present invention, a trapezoidal groove is provided on the side of the static iron core 31 facing the movable iron core 32, and the movable iron core 32 is provided with a trapezoidal protrusion that cooperates with the trapezoidal groove; a cylindrical hole is provided at the center axis position of the trapezoidal protrusion, and the first elastic member 33 is embedded in the cylindrical hole.

[0046] The combination of the trapezoidal groove and the trapezoidal protrusion can ensure the centering accuracy of the moving iron core 32 with the static iron core 31 during movement, and embedding the first elastic member 33 into the cylindrical hole can ensure the correct positioning of the elastic member on the moving iron core 32, providing a stable driving force.

[0047] In the preferred embodiment, a first step groove 121 is provided on the outer cylindrical surface of the first guide sleeve 12, and a second step groove is provided on the outer cylindrical surface of the static iron core 31; the two ends of the sleeve 4 are respectively arranged in the first step groove 121 and the second step groove to ensure that the sleeve 4 is correctly positioned between the two components.

[0048] As a preferred embodiment of the above solution, a buffer groove 122 is provided on the cylindrical surface where the first step groove 121 contacts the sleeve 4. When the conical step surface of the first step shaft 32a of the movable iron core 32 abuts against the first step groove 121, the pressure distribution during the contact process is more uniform, thus centering the movable iron core 32.

[0049] In order to avoid the formation of a sealed chamber between the iron core and the fixed block during the up and down movement of the moving iron core 32, thereby hindering the movement of the moving iron core 32, preferably, the axial section of the moving iron core 32 close to the static iron core 31 is provided with a balancing groove 34 along the circumference, so that a passage is formed between the lower and upper parts of the moving iron core 32. When the moving iron core 32 moves upward, the gas enters the bottom of the moving iron core 32 through the balancing groove 34, and the first guide sleeve 12 will divert the gas to the gap between the buffer groove 122 and the first step shaft 32a, effectively avoiding the moving iron core 32 from tilting under the action of the airflow.

[0050] In the present invention, a push rod 35 is provided on the end surface of the movable iron core 32 facing the valve core assembly 2. A tapered surface is provided at the end of the push rod 35. The tapered surface ensures that the piston body 21 remains aligned with the push rod 35 during movement, reducing wear and sticking caused by poor alignment.

[0051] Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and the specification are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A piston type solenoid valve, characterized in that: include: A valve seat (1) is arranged at a position corresponding to the valve port of the valve body; A valve core assembly (2) is placed between the valve seat (1) assembly and the valve port; A magnetic drive assembly (3) is arranged above the valve seat (1) assembly, comprising a static iron core (31), a movable iron core (32) and a first elastic member (33), and is used to drive the valve core assembly (2) to close the valve port; The movable iron core (32) is provided with a first stepped shaft (32a) and a second stepped shaft (32b), the diameter of the first stepped shaft (32a) being larger than the diameter of the second stepped shaft (32b), a through hole (11) for the movable iron core (32) to pass through is provided at the center of the valve seat (1), a first guide sleeve (12) is extended axially from the through hole (11) toward the magnetic drive assembly (3), the first guide sleeve (12) is embedded in the first stepped shaft (32a), and a sleeve (4) is provided on the outside of the guide sleeve; The through hole (11) is located at one end of the valve core assembly (2) and is provided with an abutment edge (13). The inner edge of the abutment edge (13) extends a second guide sleeve (14) in the direction of the static iron core (31). The second guide sleeve (14) is embedded in the second stepped shaft (32b).

2. The piston type solenoid valve according to claim 1, characterized in that: The valve seat (1) is connected to the valve body via a thread, and a first sealing ring (5) is provided at the end of the threaded connection shaft section.

3. The piston type solenoid valve according to claim 1, characterized in that: The valve seat (1) is provided with a connecting flange (15), and the valve body is provided with a stepped hole for embedding the connecting flange (15); A second sealing ring (6) is provided on the step surface of the step hole.

4. The piston type solenoid valve according to claim 1, characterized in that: The valve core assembly (2) comprises a piston body (21), a sealing structure (22) arranged on the outer cylindrical surface of the piston body (21), and a second elastic member (23) arranged between the piston body (21) and the valve port.

5. The piston type solenoid valve according to claim 4, characterized in that: A first buffer pad (21a) and a second buffer pad (21b) are provided at both ends of the piston body (21); The first buffer pad (21a) can abut against the moving iron core (32), and the second buffer pad (21b) can abut against the valve port of the valve body.

6. The piston type solenoid valve according to claim 1, characterized in that: A trapezoidal groove is provided on one side of the static iron core (31) facing the movable iron core (32), and a trapezoidal protrusion is provided on the movable iron core (32) to match the trapezoidal groove. A cylindrical hole is provided at the center axis position of the trapezoidal protrusion, and the first elastic member (33) is embedded in the cylindrical hole.

7. The piston type solenoid valve according to claim 1, characterized in that: A first step groove (121) is provided on the outer cylindrical surface of the first guide sleeve (12), and a second step groove is provided on the outer cylindrical surface of the static iron core (31); Both ends of the sleeve (4) are respectively arranged in the first step groove (121) and the second step groove.

8. The piston type solenoid valve according to claim 7, characterized in that: A buffer groove (122) is provided on the cylindrical surface where the first step groove (121) contacts the sleeve (4).

9. The piston type solenoid valve according to claim 1, characterized in that: A balancing groove (34) is provided along the circumference of the shaft section of the moving iron core (32) close to the static iron core (31).

10. The piston type solenoid valve according to claim 1, characterized in that: The end surface of the movable iron core (32) facing the valve core assembly (2) is provided with a push rod (35), and the end of the push rod (35) is provided with a conical surface.

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