Electromagnetic valve

Abstract

The invention provides an electromagnetic valve which is provided with a valve port part and comprises a movable iron core and a sealing plug. An elastic bulge is integrally formed on the sealing plug, the sealing plug is provided with a limiting cavity part, the limiting cavity part comprises a top end wall and a bottom end wall, and the elastic bulge convexly extends from the top end wall; the movable iron core is provided with a limiting part, the limiting part is limited in the limiting cavity part, and the limiting part comprises a top end face and a bottom end face; when the valve is in a full-open state and a full-closed state, one part of the top end face abuts against the elastic protrusion, a preset distance L is formed between the other part of the top end face and the top end wall, and the bottom end face abuts against the bottom end wall. According to the electromagnetic valve, valve opening can be achieved through small electromagnetic force, and the opening degree of the valve port part can be relatively guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of valve devices, and in particular to a solenoid valve. Background Art

[0002] The solenoid valve is provided with a valve mouth, and the solenoid valve includes a static iron core, a moving iron core, a return spring, and a sealing plug. The solenoid valve is used in conjunction with a coil. When the coil is energized, an excitation effect is generated. Under the excitation effect, the moving iron core and the sealing plug move synchronously in a direction away from the valve mouth, thereby opening the solenoid valve. When the moving iron core moves in a direction away from the valve mouth, it needs to overcome the elastic force of the return spring, the pressure difference force acting on the sealing plug toward the valve mouth, and the gravity of the sealing plug. For those skilled in the art, it is necessary to use as little electromagnetic force as possible to open the valve, and to relatively guarantee the opening of the valve mouth. Summary of the Invention

[0003] The present application provides a solenoid valve that can open the valve using a relatively small electromagnetic force and can relatively guarantee the opening degree of the valve mouth.

[0004] The solenoid valve is provided with a valve port portion, and the solenoid valve comprises a moving iron core and a sealing plug;

[0005] The sealing plug is integrally formed with an elastic protrusion, and the sealing plug is provided with a limiting cavity portion, the limiting cavity portion comprising a top end wall relatively far from the valve opening portion and a bottom end wall relatively close to the valve opening portion, the elastic protrusion protruding from the top end wall;

[0006] The movable iron core is provided with a limiting portion, the limiting portion is limited in the limiting cavity portion, and the limiting portion includes a top end surface relatively far away from the valve port portion and a bottom end surface relatively close to the valve port portion;

[0007] When the valve is fully open or fully closed, a portion of the top surface abuts against the elastic protrusion, another portion of the top surface has a preset distance L from the top wall, and the bottom surface abuts against the bottom wall.

[0008] By forming an elastic protrusion integrally with the sealing plug, in the fully closed state, a part of the top surface of the limiting portion of the moving iron core is in abutment against the elastic protrusion, and a preset distance is provided between another part of the top surface and the top wall. When the solenoid valve is opening, the moving iron core moves in a direction away from the valve mouth before the sealing plug, the elastic protrusion is compressed, and the contact area between the limiting portion and the elastic protrusion is relatively small. The larger the deformation amount obtained by the sealing plug is, the greater the upward kinetic energy obtained by the moving iron core, thereby more easily driving the sealing plug. The electromagnetic force required for the solenoid valve is relatively small; after the solenoid valve is opened, the elastic protrusion recovers until it returns to the bottom end surface of the limiting portion and is in abutment against the bottom end wall of the limiting cavity, which can relatively reduce the influence of the gravity of the sealing plug on the opening of the valve mouth, ensure the opening of the valve mouth, and realize normal operation of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A front view of an embodiment of a solenoid valve provided in this application;

[0010] Figure 2 for Figure 1 A cross-sectional view of the solenoid valve in a fully closed state is shown;

[0011] Figure 3 for Figure 2 A partial enlarged view of

[0012] Figure 4 for Figure 1 A cross-sectional view of the solenoid valve opening process shown;

[0013] Figure 5 for Figure 4 A partial enlarged view of

[0014] Figure 6 for Figure 1 A cross-sectional view of the solenoid valve in a fully closed state is shown;

[0015] Figure 7 for Figure 6 A partial enlarged view of

[0016] Figure 8 It is an enlarged cross-sectional view of the moving iron core;

[0017] Figure 9 is an enlarged cross-sectional view of the sealing plug;

[0018] Figure 10 It is a sectional perspective view of the sealing plug.

[0019] The following are the descriptions of the reference numerals:

[0020] 1 valve core, 11 valve port, 2 first sleeve, 21 pressure inlet, 3 valve seat, 4 second sleeve, 5 static iron core, 6 return spring;

[0021] 7 movable iron core, 71 limiting portion, 71a top end surface, 71b bottom end surface, 72 main body, 73 connecting portion;

[0022] 8 Sealing plug; 81 limiting cavity portion, 81a top wall, 81b bottom wall, 82 elastic protrusion, 82a segment, 83 sleeve hole portion, 84 guide channel portion. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0024] In the illustrated embodiment, the solenoid valve is provided with a valve port 11 , and includes a moving iron core 7 and a sealing plug 8 for sealing the valve port 11 .

[0025] The movable iron core 7 is provided with a limiting portion 71 . The limiting portion 71 has a top end surface 71 a relatively far away from the valve opening 11 and a bottom end surface 71 b relatively close to the valve opening 11 .

[0026] The sealing plug 8 is provided with a limiting cavity portion 81 . The limiting cavity portion 81 has a top end wall 81 a relatively far away from the valve mouth portion 11 and a bottom end wall 81 b relatively close to the valve mouth portion 11 .

[0027] The limiting portion 71 is limited in the limiting cavity 81 .

[0028] The sealing plug 8 is integrally formed with an elastic protrusion 82. The elastic protrusion 82 protrudes from the top wall 81a.

[0029] When the valve is fully closed (e.g. Figure 2 and Figure 3 As shown) and in the fully open state (as shown Figure 6 and Figure 7 As shown), a portion of the top surface 71a of the limiting portion 71 abuts against the elastic protrusion 82, and a preset distance L is formed between another portion of the top surface 71a of the limiting portion 71 and the top wall 81a of the limiting cavity portion 81.

[0030] During valve opening (e.g. Figure 4 and Figure 5 As shown in the figure, when the moving iron core 7 just starts to move away from the valve mouth 11, it compresses the elastic protrusion 82. At this stage, the sealing plug 8 does not move with the moving iron core 7 but remains in the position of sealing the valve mouth 11. Before the sealing plug 8 moves, the movement of the moving iron core 7 does not need to overcome the pressure difference force exerted on the sealing plug 8 and the gravity of the sealing plug 8. When the moving iron core 7 moves a certain distance away from the valve mouth 11, the moving iron core 7 already has a certain amount of kinetic energy. At this time, it can relatively easily drive the sealing plug 8 to move away from the valve mouth 11. Therefore, the solenoid valve can be opened using a relatively small electromagnetic force.

[0031] When the solenoid valve is opened (such as Figure 6 and Figure 7 As shown in the figure), the pressure difference force on the sealing plug 8 disappears, and the elastic protrusion 82 recovers until the bottom end surface 71b of the limiting portion 71 and the bottom end wall 81b of the limiting cavity portion 81 are offset. In this way, the influence of the gravity of the sealing plug 8 on the opening of the valve mouth portion 11 can be relatively reduced, the opening of the valve mouth portion 11 can be guaranteed, and the normal operation of the valve can be achieved. Moreover, when closing the valve again, the moving iron core 7 can quickly drive the sealing plug 8 to move toward the valve mouth portion 11 when moving toward the valve mouth portion 11. Therefore, the valve closing speed is relatively fast.

[0032] Optionally, when the valve is fully closed (e.g. Figure 2 and Figure 3 As shown) and in the fully open state (as shown Figure 6 and Figure 7 As shown), the elastic protrusion 82 is in a compressed state and can press the limiting portion 71.

[0033] Preferably, the preset distance L is in the range of 0.05 mm ≤ L ≤ 0.5 mm, more preferably 0.2 mm ≤ L ≤ 0.4 mm. This range can take both the valve opening electromagnetic force and the valve opening speed into consideration.

[0034] More specifically, Figure 10 As shown, the elastic protrusion 82 is an annular structure, and the elastic protrusion 81 is provided with a guide channel portion 84. The guide channel portion 84 passes through from the inner periphery of the elastic protrusion 82 to the outer periphery of the elastic protrusion 82.

[0035] More specifically, Figure 10 As shown, the elastic protrusion 82 has a plurality of segments 82a spaced apart along the circumferential direction, and the spaces between adjacent segments 82a form the guide channel portion 84. In this way, it is convenient to form the whole body and the molding cost is low.

[0036] More specifically, the movable iron core 7 further comprises a main body 72 and a connecting portion 73. The connecting portion 73 is located between the bottom end of the main body 72 and the top end of the stopper 71. The main body 72 of the movable iron core 7 comprises a large-diameter section and a small-diameter section. The cross-sectional area of ​​the connecting portion 73 is smaller than that of the stopper 71, and the cross-sectional area of ​​the stopper 71 is smaller than that of the small-diameter section of the main body 72.

[0037] More specifically, the sealing plug 8 is provided with a sleeve hole portion 83 , the channel of the sleeve hole portion 83 is connected to the limiting cavity portion 81 , the sleeve hole portion 83 is sleeved on the outer periphery of the connecting portion 73 , and the elastic protrusion 82 is provided around the bottom end opening of the sleeve hole portion 83 .

[0038] More specifically, there is a first gap Z between the inner periphery of the sleeve hole portion 83 and the outer periphery of the connecting portion 73, and a second gap Y between the top end of the sealing plug 8 and the bottom end of the main body 72. The solenoid valve is also provided with a valve cavity portion X, and the sealing plug 8 is located in the valve cavity portion X. The limiting cavity portion 81 can be connected to the valve cavity portion X through the guide channel portion 84, the first gap Z and the second gap Y, so that the air pressure in the limiting cavity portion 81 is balanced with the air pressure in the valve cavity portion X. In this way, the pressure difference force on the sealing plug 8 is smaller, which is more conducive to reducing the electromagnetic force required to open the valve.

[0039] Preferably, Figure 9As shown, the radial width A of the elastic protrusion 82 is in the range of 0.05 mm ≤ A ≤ 0.3 mm. The circumferential length C of the flow guide channel portion 84 is in the range of 0.05 mm ≤ C ≤ 0.5 mm. In the natural state (i.e., non-compressed and non-stretched), the protrusion height B of the elastic protrusion 82 relative to the top wall 81 a is in the range of 0.05 mm ≤ B ≤ 0.5 mm. This ensures that the elastic protrusion 82 has a balanced elastic deformation ability, resilience, and pressure bearing capacity.

[0040] More specifically, the solenoid valve also includes a valve core 1, a valve seat 3 and a first sleeve 2. The valve mouth portion 11 is provided on the valve core 1. The bottom end (the lower end in the figure) of the first sleeve 2 is sleeved on the outer periphery of the valve core 1, and the bottom end surface of the first sleeve 2 abuts against the limiting step surface on the valve core 1. The top end of the first sleeve 2 is sleeved on the outer periphery of the valve seat 3, and the top end surface of the first sleeve 2 abuts against a limiting step surface on the valve seat 3. The side wall of the first sleeve 2 encloses at least part of the valve cavity portion X, and the valve cavity portion X is located between the valve seat 3 and the valve core 1. A pressure inlet portion 21 connected to the valve cavity portion X is provided on the side wall of the first sleeve 2.

[0041] More specifically, the solenoid valve further includes a second sleeve 4, a static iron core 5 and a return spring 6. The bottom end of the second sleeve 4 is sleeved on the outer periphery of the valve seat 3, and the bottom end surface 71b of the second sleeve 4 abuts against another limiting step surface on the valve seat 3. The top end of the second sleeve 4 is sleeved on the outer periphery of the static iron core 5, and the top end surface of the second sleeve 4 can be welded and fixed to the static iron core 5. The moving iron core 7 is at least partially located within the first sleeve 2, the valve seat 3 and the second sleeve 4. The outer peripheral surface of the large diameter section of the main body 72 of the moving iron core 7 ( Figure 8 75 in the middle) is in clearance with the inner circumference of the first sleeve 2, and the outer circumference of the small diameter section of the main body 72 of the moving iron core 7 ( Figure 8 The inner circumference of the valve seat 3 (indicated by 74) is fitted with a clearance between the moving iron core 7 and the static iron core 5, so that the moving iron core 7 can move. The static iron core 5 is located on the top side of the moving iron core 7. Both the static iron core 5 and the moving iron core 7 are provided with countersunk holes. The return spring 6 is located between the moving iron core 7 and the static iron core 5, and the two ends of the return spring 6 are respectively installed in the countersunk holes of the static iron core 5 and the moving iron core 7. When the moving iron core 7 moves in a direction away from the valve mouth 11, it needs to overcome the elastic force of the return spring 6. When the solenoid valve reaches the fully open state, the moving iron core 7 and the static iron core 5 are against each other.

[0042] The principles and implementation methods of this application have been described above using specific examples. The description of the above embodiments is only intended to help understand the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from the principles of this application, and such improvements and modifications also fall within the scope of protection of the claims of this application.

Claims

1. A solenoid valve, characterized in that: The solenoid valve is provided with a valve port portion (11), and the solenoid valve comprises a moving iron core (7) and a sealing plug (8); The sealing plug (8) is integrally formed with an elastic protrusion (82), and the sealing plug (8) is provided with a limiting cavity (81), the limiting cavity (81) comprising a top end wall (81a) relatively far from the valve opening (11) and a bottom end wall (81b) relatively close to the valve opening (11), and the elastic protrusion (82) protrudes from the top end wall (81a); The movable iron core (7) is provided with a limiting portion (71), the limiting portion (71) is limited in the limiting cavity (81), and the limiting portion (71) includes a top end surface (71a) relatively far from the valve mouth (11) and a bottom end surface (71b) relatively close to the valve mouth (11); When the valve is fully open or fully closed, a portion of the top surface (71a) abuts against the elastic protrusion (82), another portion of the top surface (71a) has a preset distance L from the top wall (81a), and the bottom surface (71b) abuts against the bottom wall (81b).

2. The solenoid valve according to claim 1, characterized in that In the fully open state and the fully closed state of the valve, the elastic protrusion (82) is in a compressed state.

3. The solenoid valve according to claim 1, characterized in that The range of the preset spacing L is: 0.05mm≤L≤0.5mm.

4. The solenoid valve according to any one of claims 1 to 3, characterized in that: The elastic protrusion (82) is an annular structure, and the elastic protrusion (81) is provided with a flow guide channel portion (84), and the flow guide channel portion (84) passes through from the inner periphery of the elastic protrusion (82) to the outer periphery of the elastic protrusion (82).

5. The solenoid valve according to claim 4, characterized in that The elastic protrusion (82) has a plurality of segments (82a) arranged at intervals along the circumferential direction, and the interval spaces between adjacent segments (82a) form the guide channel portion (84).

6. The solenoid valve according to claim 4, characterized in that The radial width A of the elastic protrusion (82) is in the range of 0.05 mm ≤ A ≤ 0.3 mm, the protruding height B of the elastic protrusion (82) relative to the top wall (81a) in the natural state is in the range of 0.05 mm ≤ B ≤ 0.5 mm, and the circumferential length C of the guide channel portion (84) is in the range of 0.05 mm ≤ C ≤ 0.5 mm.

7. The solenoid valve according to claim 4, characterized in that The movable iron core (7) is further provided with a main body (72) and a connecting portion (73), wherein the connecting portion (73) is located between the bottom end of the main body (72) and the top end of the limiting portion (71), and the sealing plug (8) is further provided with a sleeve hole portion (83), wherein the sleeve hole portion (83) is sleeved on the outer periphery of the connecting portion (73), and the channel of the sleeve hole portion (83) is connected to the limiting cavity portion (81), and the elastic protrusion (82) is arranged around the bottom end opening of the sleeve hole portion (83).

8. The solenoid valve according to claim 7, characterized in that A first gap (Z) is provided between the inner periphery of the sleeve hole portion (83) and the outer periphery of the connecting portion (73), a second gap (Y) is provided between the top end of the sealing plug (8) and the bottom end of the main body portion (72), the solenoid valve is further provided with a valve cavity portion (X), the sealing plug (8) is located in the valve cavity portion (X), and the limiting cavity portion (81) can be communicated with the valve cavity portion (X) through the guide channel portion (84), the first gap (Z) and the second gap (Y).

9. The solenoid valve according to claim 8, characterized in that The solenoid valve comprises a valve core (1), a valve seat (3) and a first sleeve (2), wherein the top end of the first sleeve (2) is sleeved on the outer periphery of the valve seat (3), and the bottom end of the first sleeve (2) is sleeved on the outer periphery of the valve core (1), and the side wall of the first sleeve (2) encloses at least part of the valve cavity (X), and the side wall of the first sleeve (2) is provided with a pressure inlet portion (21) connected to the valve cavity (X).

10. The solenoid valve according to claim 9, characterized in that The solenoid valve further comprises a second sleeve (4), a static iron core (5) and a return spring (6), wherein the bottom end of the second sleeve (4) is sleeved on the outer periphery of the valve seat (3), and the top end of the second sleeve (4) is sleeved on the outer periphery of the static iron core (5), the moving iron core (7) is at least partially located inside the first sleeve (2), the valve seat (3) and the second sleeve (4), the static iron core (5) is located on the top side of the moving iron core (7), and the return spring (6) is located between the moving iron core (7) and the static iron core (5).

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