Combined electromagnetic valve

Abstract

The utility model relates to the technical field of electromagnetic valves, in particular to a combined electromagnetic valve which comprises a valve body, a piston assembly and an electromagnetic driving assembly. The electromagnetic driving assembly comprises a sleeve, a movable iron core and a static iron core which are coaxially arranged in the sleeve, and a valve needle which penetrates through the static iron core, and is used for driving the piston assembly to seal the valve port; the movable iron core is provided with a stepped hole, the end of the valve needle is provided with a limiting boss matched with the stepped hole, a first spring is arranged in the stepped hole, a second spring is arranged in a movable gap between the static iron core and the movable iron core, and an air guide hole communicated with the stepped hole and the movable gap is formed in the movable iron core. Through the arrangement of the air guide hole in the movable iron core, air exhaust between the static iron core and the movable iron core is achieved, the pressure balance effect of the movable iron core is improved, the air suffocation phenomenon is reduced, the movement stability of the valve needle is improved, normal work of the electromagnetic valve is effectively guaranteed, and the service life of the electromagnetic valve is prolonged.

Description

Technical Field

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

[0002] A normally open solenoid valve is one that remains open when power is off. It typically consists of a valve body with a valve port, a piston assembly for closing the port, and a drive mechanism that actuates the piston assembly. The drive mechanism includes a stationary iron core, a movable iron core, and a valve needle. The stationary iron core engages and releases the movable iron core, causing the valve needle to move up and down, thereby opening and closing the solenoid valve. However, the solenoid valve can only exhaust air through the assembly gap between the valve needle and the stationary iron core. This results in poor pressure balance and can easily lead to air holding, resulting in unstable valve needle movement and affecting the normal operation and service life of the solenoid valve. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide a combined solenoid valve to effectively solve the problems in the background technology.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a combined solenoid valve, comprising:

[0005] Valve body;

[0006] A piston assembly is arranged at the valve port of the valve body;

[0007] An electromagnetic drive assembly, comprising a sleeve, a movable iron core and a stationary iron core coaxially disposed in the sleeve, and a valve needle disposed through the stationary iron core, for driving the piston assembly to close the valve port;

[0008] In which, the moving iron core is provided with a step hole, the end of the valve needle is provided with a limiting boss that cooperates with the step hole, a first spring is provided in the step hole, a second spring is provided in the movable gap between the static iron core and the moving iron core, and an air guide hole connecting the step hole and the movable gap is provided on the moving iron core.

[0009] Furthermore, a plurality of the air guide holes are evenly distributed along the circumferential direction of the moving iron core.

[0010] Furthermore, a plugging head is provided at the end of the stepped hole of the moving iron core, and the first spring is arranged between the plugging head and the limiting boss of the valve needle.

[0011] Furthermore, matching protrusions and grooves are provided on opposite end surfaces of the moving iron core and the static iron core.

[0012] Furthermore, the air guide hole includes a first through hole and a second through hole that are connected to each other;

[0013] The first through hole is arranged parallel to the valve needle, and the second through hole is arranged along the circumferential direction of the moving iron core, and is used to connect the step hole and the first through hole.

[0014] Furthermore, the first through hole is arranged at an outer edge of an end surface of the moving iron core.

[0015] Furthermore, the sleeve includes a tube body and a sealing cover arranged at one end of the tube body.

[0016] Furthermore, the piston assembly includes a piston seat, a piston body, a first sealing gasket, a second sealing gasket and a third spring;

[0017] The first sealing gasket contacts the valve needle, and the second sealing gasket contacts the valve port.

[0018] Furthermore, a balancing hole is provided on the piston body.

[0019] Furthermore, the piston seat is provided with a first cavity and a second cavity, the static iron core is provided in the first cavity, and the piston body is provided in the second cavity.

[0020] The beneficial effects of the present invention are as follows: the present invention realizes the exhaust between the static iron core and the moving iron core by setting the air guide hole on the moving iron core, improves the pressure balance effect of the moving iron core, reduces the air holding phenomenon, improves the stability of the valve needle movement, effectively ensures the normal operation of the solenoid valve, and extends the service life of the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 This is a structural diagram of a combined solenoid valve in an embodiment of the present utility model;

[0023] Figure 2 This is a structural diagram of a combined solenoid valve in an embodiment of the present utility model;

[0024] Figure 3 This is a structural diagram of the label suction and transmission mechanism in an embodiment of the present utility model;

[0025] Figure 4 This is a structural diagram of the label winding and pasting mechanism in an embodiment of the present utility model.

[0026] Figure numerals: 1. valve body; 2. piston assembly; 21. piston seat; 22. piston body; 221. balancing hole; 23. first sealing gasket; 24. second sealing gasket; 25. third spring; 3. electromagnetic drive assembly; 31. sleeve; 32. moving iron core; 321. step hole; 322. air guide hole; 322a. first through hole; 322b. second through hole; 33. static iron core; 34. valve needle; 341. limiting boss; 4. first spring; 5. second spring; 6. sealing head. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] like Figures 1 to 4 The combined solenoid valve shown includes: a valve body 1, a piston assembly 2, and an electromagnetic drive assembly 3. The piston assembly 2 is disposed at the valve port of the valve body 1. The electromagnetic drive assembly 3 includes a sleeve 31, a movable iron core 32 and a stationary iron core 33 coaxially disposed within the sleeve 31, and a valve needle 34 disposed through the stationary iron core 33 for driving the piston assembly 2 to close the valve port.

[0031] Among them, the moving iron core 32 is provided with a step hole 321, the end of the valve needle 34 is provided with a limiting boss 341 that cooperates with the step hole 321, a first spring 4 is provided in the step hole 321, a second spring 5 is provided in the movable gap between the static iron core 33 and the moving iron core 32, and an air guide hole 322 connecting the step hole 321 and the movable gap is provided on the moving iron core 32.

[0032] During the implementation of the present invention, in the initial state of the solenoid valve, the valve port is in a normally open state. When the valve port needs to be closed, the electromagnetic coil is energized, the movable iron core 32 moves toward the static iron core 33, and the gas in the movable gap enters the step hole 321 through the air guide hole 322. The valve needle 34 pushes the piston assembly 2 to close the valve port under the action of the first spring 4. When the valve port needs to be opened, the electromagnetic valve is de-energized, the movable iron core 32 moves away from the static iron core 33, the valve needle 34 is separated from the piston assembly 2, and under the reaction force of the second spring 5, the piston assembly 2 moves toward the static iron core 33 to open the valve port. By setting the air guide hole 322 on the movable iron core 32, the exhaust between the static iron core 33 and the movable iron core 32 is achieved, the pressure balance effect of the movable iron core 32 is improved, the air holding phenomenon is reduced, the movement stability of the valve needle 34 is improved, the normal operation of the solenoid valve is effectively guaranteed, and the service life of the solenoid valve is extended.

[0033] In the preferred embodiment of the present invention, a plurality of air guide holes 322 are evenly distributed along the circumference of the moving iron core 32. This increases the passage for gas circulation and helps to achieve a more uniform pressure balance between the moving iron core 32 and the static iron core 33.

[0034] In this utility model, a plugging head 6 is provided at the end of the stepped hole 321 of the movable iron core 32. A first spring 4 is positioned between the plugging head 6 and the limiting boss 341 of the valve needle 34. When the valve needle 34 drives the piston assembly 2 to seal the valve port, the valve needle 34, under the action of the first spring 4, acts as a buffer, reducing the noise generated by the impact. The provision of the plugging head 6 facilitates control of the driving force of the first spring 4.

[0035] In the preferred embodiment of the present invention, matching protrusions and grooves are provided on the opposite end surfaces of the moving iron core 32 and the static iron core 33 .

[0036] The cooperation of the protrusion and the groove can improve the centering between the movable iron core 32 and the static iron core 33 , ensuring that they can be accurately docked when they are attracted, thereby ensuring the movement reliability of the valve needle 34 .

[0037] As a preferred structure, the air guide hole 322 includes a first through hole 322a and a second through hole 322b. The first through hole 322a is arranged parallel to the valve needle 34, and the second through hole 322b is arranged along the circumference of the movable iron core 32, connecting the stepped hole 321 and the first through hole 322a. The combination of the first through hole 322a and the second through hole 322b effectively guides the flow of gas, ensuring smooth gas discharge from the stepped hole 321. This helps achieve better pressure balance between the movable iron core 32 and the stationary iron core 33, reduces air holding, and improves the smooth movement of the valve needle 34.

[0038] Based on the above solution, the first through hole 322a is provided at the outer edge of the end surface of the movable iron core 32. The gas flow path is optimized to make the gas flow more uniform, so that the gas can be discharged from the movable gap more quickly, reducing the delay in the movement of the valve needle 34.

[0039] In a preferred embodiment of the present invention, the sleeve 31 includes a tube body and a sealing cover provided at one end of the tube body, thereby improving the sealing and safety of the solenoid valve.

[0040] The piston assembly 2 in this utility model includes a piston seat 21, a piston body 22, a first sealing gasket 23, a second sealing gasket 24, and a third spring 25. The first sealing gasket 23 contacts the valve needle 34, while the second sealing gasket 24 contacts the valve port. The sealing gaskets absorb vibration and shock, reducing wear on the valve needle 34 and the valve port, thereby extending the service life of the solenoid valve.

[0041] As a preferred embodiment of the above embodiment, a balancing hole 221 is provided on the piston body 22. The balancing hole 221 can balance the pressure on both sides of the piston, reduce piston deviation or sticking caused by pressure difference, and thus improve the stability and reliability of the solenoid valve.

[0042] As a preferred embodiment of the above embodiment, the piston seat 21 is provided with a first cavity and a second cavity, the static iron core 33 is disposed in the first cavity, and the piston body 22 is disposed in the second cavity. By arranging the static iron core 33 and the piston body 22 in different cavities, interference between components caused by pressure fluctuations can be reduced, thereby improving the reliability of the solenoid valve.

[0043] 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 combined solenoid valve, characterized in that: include: Valve body (1); A piston assembly (2) is arranged at the valve port of the valve body (1); An electromagnetic drive assembly (3) comprises a sleeve (31), a moving iron core (32) and a static iron core (33) coaxially arranged in the sleeve (31), and a valve needle (34) arranged through the static iron core (33), and is used to drive the piston assembly (2) to close the valve port; The movable iron core (32) is provided with a stepped hole (321), the end of the valve needle (34) is provided with a limiting boss (341) that cooperates with the stepped hole (321), a first spring (4) is provided in the stepped hole (321), a second spring (5) is provided in the movable gap between the static iron core (33) and the movable iron core (32), and an air guide hole (322) connecting the stepped hole (321) and the movable gap is provided on the movable iron core (32).

2. The combined solenoid valve according to claim 1, characterized in that: A plurality of air guide holes (322) are evenly distributed along the circumferential direction of the moving iron core (32).

3. The combined solenoid valve according to claim 1, characterized in that: A plugging head (6) is provided at the end of the stepped hole (321) of the moving iron core (32), and the first spring (4) is arranged between the plugging head (6) and the limiting boss (341) of the valve needle (34).

4. The combined solenoid valve according to claim 1, characterized in that: Matching protrusions and grooves are provided on the opposite end surfaces of the moving iron core (32) and the static iron core (33).

5. The combined solenoid valve according to claim 1, characterized in that: The air guide hole (322) comprises a first through hole (322a) and a second through hole (322b) that are connected to each other; The first through hole (322a) is arranged parallel to the valve needle (34), and the second through hole (322b) is arranged along the circumferential direction of the moving iron core (32) for connecting the step hole (321) and the first through hole (322a).

6. The combined solenoid valve according to claim 5, characterized in that: The first through hole (322a) is arranged at an outer edge of the end surface of the moving iron core (32).

7. The combined solenoid valve according to claim 1, characterized in that: The sleeve (31) comprises a tube body and a sealing cover arranged at one end of the tube body.

8. The combined solenoid valve according to claim 1, characterized in that: The piston assembly (2) comprises a piston seat (21), a piston body (22), a first sealing gasket (23), a second sealing gasket (24) and a third spring (25); The first sealing gasket (23) contacts the valve needle (34), and the second sealing gasket (24) contacts the valve port.

9. The combined solenoid valve according to claim 8, characterized in that: A balancing hole (221) is provided on the piston body (22).

10. The combined solenoid valve according to claim 8, characterized in that: The piston seat (21) is provided with a first cavity and a second cavity, the static iron core (33) is arranged in the first cavity, and the piston body (22) is arranged in the second cavity.

Images