CN221120918U - Electromagnetic valve - Google Patents

Abstract

The application relates to an electromagnetic valve, which comprises a valve body assembly, wherein the valve body assembly is provided with a valve cavity and a main valve opening capable of being communicated with the valve cavity, the electromagnetic valve further comprises a first iron core, a second iron core, a valve core assembly and a piston assembly, wherein the first iron core is provided with a first cavity, the second iron core is provided with a second cavity, the piston assembly is used for opening or closing a main valve opening, and one end of the piston assembly, which is far away from the main valve opening, is provided with a valve guide opening. The valve core assembly comprises a sealing part and a valve rod part, the valve core assembly is movably matched with the pilot valve through the sealing part in a sealing way, one end of the valve rod part is movably inserted into the first cavity and can be stopped in the first cavity, the other end of the valve rod part penetrates through the second cavity and is connected with the sealing part, and the sealing part can be stopped outside the second cavity. The electromagnetic valve provided by the application solves the problems of low assembly precision of the electromagnetic valve and low assembly efficiency of the electromagnetic valve.

Description

Electromagnetic valve

Technical Field

The application relates to the technical field of electromagnetic valves, in particular to an electromagnetic valve.

Background

In the existing solenoid valve, more parts forming a valve core assembly are needed, and when the solenoid valve is assembled, a plurality of parts are needed to be respectively installed in the valve sleeve one by one, but in this way, the assembly error of the whole solenoid valve can be increased, the assembly precision of the solenoid valve is affected, and the assembly efficiency of the solenoid valve is reduced.

Disclosure of utility model

Based on this, it is necessary to provide a solenoid valve to solve the problems of low assembly accuracy of the solenoid valve and low assembly efficiency of the solenoid valve.

The electromagnetic valve comprises a valve body assembly, wherein the valve body assembly is provided with a valve cavity and a main valve opening capable of being communicated with the valve cavity, the electromagnetic valve further comprises a first iron core, a second iron core, a valve core assembly and a piston assembly, the first iron core is provided with a first cavity, the second iron core is provided with a second cavity, the piston assembly is used for opening or closing a main valve opening, and one end, far away from the main valve opening, of the piston assembly is provided with a valve guide opening. The valve core assembly comprises a sealing part and a valve rod part, the valve core assembly is movably matched with the pilot valve through the sealing part in a sealing way, one end of the valve rod part is movably inserted into the first cavity and can be stopped in the first cavity, the other end of the valve rod part penetrates through the second cavity and is connected with the sealing part, and the sealing part can be stopped outside the second cavity.

In one embodiment, the electromagnetic valve further comprises a coil, and the first iron core and the second iron core are movably arranged in the valve cavity; the height value of the first iron core protruding out of the coil is constantly larger than or equal to zero.

In one embodiment, the valve core assembly further comprises a limiting portion, the inner wall of the first cavity is provided with a limiting protrusion corresponding to the limiting portion, the limiting portion is connected to the outer side of the valve rod portion, and the limiting portion is movably matched with the inner wall of the first cavity and can stop at one end, far away from the main valve port, of the limiting protrusion.

In one embodiment, the sealing portion comprises a connector and a sealing head, the connector is fixedly connected to the valve rod portion, the connector can stop at one end of the second iron core, which is away from the first iron core, and the sealing head is mounted on the connector and movably matched with the pilot valve in a sealing manner.

In one embodiment, the piston assembly comprises a plug body, a sealing ring and an extension part, wherein the extension part is fixedly arranged at one end of the plug body close to the main valve port, and the sealing ring is sleeved on the outer side of the extension part and is in movable sealing fit with the main valve port. The extension is far from the vertical distance p between the end face of the pilot valve port and the pilot valve port, and the vertical distance q between the main valve port and the pilot valve port is satisfied, and p > q.

In one embodiment, the electromagnetic valve further comprises a push rod and a first elastic piece, one end of the push rod is abutted against the inner wall of the valve body component, which is far away from the main valve port, the other end of the push rod extends into the first cavity and is in guide fit with the inner wall of the first cavity, and the other end of the push rod is limited in the first cavity; the first elastic piece is located in the first cavity, and two ends of the first elastic piece are respectively abutted to the ejector rod and the valve rod.

In one embodiment, the electromagnetic valve further comprises a second elastic piece, and the second iron core is provided with a mounting hole facing the first iron core; at least part of the second elastic piece is positioned in the mounting hole; the first iron core is provided with a protruding part, one end of the second elastic piece is abutted against the second iron core, and the other end is abutted against the protruding part; when the solenoid valve is in a closed state, at least part of the protruding part is positioned in the mounting hole.

In one embodiment, the second core is provided with a mounting hole coaxially arranged and communicated with the second cavity, the mounting hole is arranged at one end of the second cavity close to the first core, the diameter of the mounting hole is larger than that of the second cavity, a first limiting step is formed between the mounting hole and the second cavity, and one end of the second elastic piece is abutted to the first limiting step.

In one embodiment, the mounting hole includes a first hole section and a second hole section, the first hole section is communicated with the second cavity, the second hole section is a counterbore, and the second hole Duan Sheyu mounting hole is near one end of the first core, the diameter of the second hole section is larger than that of the first hole section, so that a second limiting step is formed between the first hole section and the second hole section, the protruding portion is movably matched with the second hole section, and when the coil is powered off, at least part of the protruding portion is located in the second hole section.

In one embodiment, a valve body assembly includes a valve housing, a body portion, and a valve cover, the valve housing being coupled to the body portion by the valve cover. The valve sleeve comprises a main body section, a large-diameter section and a variable-diameter section connected with the main body section and the large-diameter section, the diameter of the large-diameter section is larger than that of the main body section, the valve sleeve is provided with an inclined section matched with the variable-diameter section, and the distance between the variable-diameter section and the inclined section is larger than or equal to zero.

Compared with the prior art, the electromagnetic valve provided by the application has the advantages that in the assembly process, the second elastic piece can be arranged between the first iron core and the second iron core, the valve rod part sequentially penetrates through the first cavity and the second cavity, the sealing part is arranged at one end of the valve rod part penetrating out of the second cavity, and finally, the first elastic piece can be arranged at one end of the first cavity far away from the valve rod part. Because the valve rod portion locates the one end in first chamber and first chamber spacing cooperation to and, sealing portion backstop is in the one end that the second iron core deviates from first iron core to restrict the removal of valve rod portion. Therefore, under the limiting action of the valve core assembly, the first iron core, the second iron core, the valve rod and the sealing part can be assembled together, and the first iron core, the second iron core, the valve rod and the sealing part cannot be disassembled under the condition that the sealing part is not dismounted. Therefore, when the electromagnetic valve is assembled, the first iron core, the second iron core, the valve rod and the sealing part can be assembled to form an assembly body, and then the assembly body is integrally installed in the valve sleeve, so that the assembly precision of the electromagnetic valve is improved, and the assembly efficiency of the electromagnetic valve is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present application, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following descriptions are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

FIG. 1 is a schematic diagram of a solenoid valve according to an embodiment of the present application;

Fig. 2 is a cross-sectional view of a solenoid valve according to an embodiment of the present application.

Reference numerals: 100. a valve body assembly; 110. a valve sleeve; 111. a main body section; 112. a reducing section; 113. a large diameter section; 120. a main body portion; 121. a main valve port; 122. a flow path inlet; 123. a flow path outlet; 130. a valve cover; 140. a valve cavity; 200. a valve core assembly; 210. a sealing part; 211. a connector; 2111. a clamping hole; 212. a sealing head; 220. a valve stem portion; 230. a limit part; 300. a piston assembly; 310. a plug body; 311. a valve guide port; 312. a first through hole; 313. a second through hole; 320. a seal ring; 330. an extension; 331. a passage hole; 340. surrounding edges; 350. a buffer ring; 400. a first iron core; 410. a first chamber; 411. a limit protrusion; 420. a boss; 500. a second iron core; 510. a second chamber; 511. sealing the guide hole; 512. a stop step; 513. a mounting hole; 514. a first limit step; 515. a second bore section; 516. a second limit step; 600. a push rod; 610. a rod body; 620. an outer protruding portion; 700. a first elastic member; 800. a second elastic member; 900. a coil.

Detailed Description

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, in one embodiment, the solenoid valve includes a valve body assembly 100, a valve core assembly 200, a piston assembly 300, a first core 400, a second core 500, and a carrier rod 600. The valve body assembly 100 includes a valve housing 110, a body portion 120, and a bonnet 130. The valve housing 110 is fixedly coupled to the valve cap 130 by welding or other coupling means, and the valve cap 130 is coupled to the body portion 120.

Further, in one embodiment, the valve sleeve 110 includes a main body section 111, a large diameter section 113, and a variable diameter section 112 connecting the main body section 111 and the large diameter section 113, the large diameter section 113 has a larger diameter than the main body section 111, and the valve sleeve 110 is interference fit and welded with the valve cap 130 through the large diameter section 113.

Since the diameter of the large diameter section 113 is larger than the diameter of the main body section 111, the diameter of the variable diameter section 112 tends to increase in the direction from the main body section 111 to the large diameter section 113. To facilitate the connection of the valve sleeve 110 and the valve cap 130, the large diameter section 113 and the valve cap 130 are interference fit and welded, and the variable diameter section 112 and the valve cap 130 may be in a fit connection or a clearance fit, and the main body section 111 and the valve cap may be in a clearance fit or an interference fit and welded, which is not particularly limited herein. The valve cap 130 is provided with an inclined section that mates with the variable diameter section 112, and the inclined section cooperates with the variable diameter section 112 to prevent the valve sleeve 110 from being removed from above the valve cap 130. Because the inclination angle of the variable diameter section 112 cannot be guaranteed to be completely attached to the inclined section of the tilt valve cover 130, the distance between the variable diameter section 112 and the inclined section is greater than or equal to zero, that is, the variable diameter section 112 cannot have the functions of being connected with the valve cover 130 and preventing the valve sleeve 110 from being separated. Therefore, the large-diameter section 113 may be added, and the large-diameter section 113 may be connected to the valve cover 130, so that the inclined section may still have the effect of preventing the valve sleeve 110 from being pulled out from above the valve cover 130.

The valve body assembly 100 is provided with a valve cavity 140, the valve core assembly 200, the piston assembly 300, the first iron core 400, the second iron core 500 and the ejector rod 600 are all arranged in the valve cavity 140, the main body part 120 is provided with a main valve opening 121, a flow path inlet 122 and a flow path outlet 123 which can be respectively communicated with the valve cavity 140, and fluid can sequentially enter the valve cavity 140 through the flow path inlet 122 and can enter the flow path outlet 123 through the main valve opening 121. One end of the piston assembly 300 is movably and sealingly engaged with the main valve port 121 to open or close the main valve port 121, the end of the piston assembly 300 remote from the main valve port 121 is provided with a pilot valve port 311, and the piston assembly 300 is further provided with a first through hole 312 communicating the pilot valve port 311 with the main valve port 121.

The first iron core 400 is disposed at an end of the valve housing 110 away from the main body 120, and the second iron core 500 is disposed partially within the valve housing 110 and partially extends into the main body 120. The first iron core 400 is provided with a first cavity 410, the second iron core 500 is provided with a second cavity 510, one end of the valve core assembly 200 is movably inserted into the first cavity 410, the other end of the valve core assembly 200 passes through the second cavity 510 and is movably matched with the pilot valve hole 311 in a sealing way, a first elastic piece 700 (including but not limited to a spring structure) is arranged between the ejector rod 600 and the valve core assembly 200, and the first elastic piece 700 can apply elastic acting force to the valve core assembly 200 far away from the ejector rod 600.

Specifically, as shown in fig. 2, one end of the ejector rod 600 abuts against the inner wall of the valve sleeve 110 far away from the main valve port 121, the other end extends into the first cavity 410 and is in guiding fit with the inner wall of the first cavity 410, the other end of the ejector rod 600 is limited in the first cavity 410, the first elastic member 700 is located in the first cavity 410, and two ends of the first elastic member 700 abut against the ejector rod 600 and the valve rod 220 respectively. The other end of the ejector pin 600 may be limited by providing a rivet edge at the top of the first core 400.

In this way, the first elastic member 700 can be always located in the first cavity 410, so that the first elastic member 700 can be prevented from extending out of the first cavity 410 to be easily bent and deformed, and further friction breakage between the first elastic member 700 and the first iron core 400 caused by bending and deformation is avoided, that is, the service life of the first elastic member 700 is prolonged.

More specifically, as shown in fig. 2, the ejector 600 includes a rod 610 and an outer protruding portion 620, the outer protruding portion 620 is fixedly connected to the outer side of the rod 610 or integrally formed with the rod 610, and one end of the first elastic member 700, which is far away from the valve core assembly 200, is stopped at the outer protruding portion 620.

As shown in fig. 2, a second elastic member 800 is provided between the first core 400 and the second core 500. One end of the second elastic member 800 abuts against the first core 400, and the other end abuts against the second core 500, so as to exert a thrust force on the first core 400 and the second core 500, respectively.

By providing the second elastic member 800, it is possible to ensure that the second elastic member 800 can push the valve element assembly 200 open when the solenoid valve is de-energized, and thus ensure the opening degree of the valve guide port 311.

Further, the second core 500 is provided with a mounting hole 513 facing the first core 400, at least part of the second elastic member 800 is located in the mounting hole 513, the first core 400 is provided with a protruding portion 420, one end of the second elastic member 800 abuts against the second core 500, and the other end abuts against the protruding portion. When the solenoid valve is in a closed state, at least a portion of the boss 420 is located within the mounting hole 513.

Specifically, as shown in fig. 2, the second core 500 is provided with a mounting hole 513 coaxially disposed and communicated with the second cavity 510, the mounting hole 513 is disposed at one end of the second cavity 510 close to the first core 400, the diameter of the mounting hole 513 is larger than that of the second cavity 510, so that a first limiting step 514 is formed between the mounting hole 513 and the second cavity 510, at least part of the second elastic member 800 is disposed in the mounting hole 513, one end of the second elastic member 800 is abutted to the first limiting step 514, and the other end is abutted to the first core 400.

In this way, the installation of the second elastic member 800 is facilitated.

Further, the second elastic member 800 is sleeved outside the valve core assembly 200.

Further, in one embodiment, as shown in fig. 2, the mounting hole 513 includes a first hole section and a second hole section 515, where the first hole section is in communication with the second cavity 510, the second hole section 515 is a counterbore, the second hole section 515 is coaxially disposed and in communication with the mounting hole 513, and the second hole section 515 is disposed at an end of the mounting hole 513 near the first core 400, and the diameter of the second hole section 515 is larger than the diameter of the first hole section, so that a second limiting step 516 is formed between the first hole section and the second hole section 515. The boss 420 is in movable engagement with the second bore section 515, and when the coil 900 of the solenoid valve is de-energized, at least a portion of the boss 420 extends into the second bore section 515 away from the end of the first core 400. The protruding portion 420 can limit the second elastic member 800, so as to prevent the second elastic member 800 from being separated from the mounting hole 513.

So, can make second elastic component 800 be located the second intracavity 510 all the time to, can avoid second elastic component 800 to stretch out the second chamber 510 and take place bending deformation easily, and then avoid second elastic component 800 to take place bending deformation and lead to self and second iron core 500 to take place friction fracture, also namely, so set up, improved second elastic component 800's life.

When the coil 900 of the solenoid valve is in the de-energized state, the second elastic member 800 can push the first iron core 400 and the second iron core 500 in opposite directions, and put the first elastic member 700 in the compressed state.

The working process of the electromagnetic valve is as follows:

When the coil 900 of the electromagnetic valve is electrified, the first iron core 400 and the second iron core 500 overcome the elastic force of the second elastic member 800 under the action of electromagnetic force and are attracted to each other, at this time, the first elastic member 700 stretches and pushes the valve core assembly 200 to move downwards, so that the valve core assembly 200 contacts and closes the valve guide port 311;

Then, under the pushing action of the first elastic member 700 and the hydraulic pressure, the valve core assembly 200 and the piston assembly 300 continue to move downwards, and the piston assembly 300 closes the main valve port 121;

It should be noted that, as shown in fig. 2, the piston assembly 300 is further provided with a second through hole 313, and the second through hole 313 penetrates through one end of the piston assembly 300 near the main valve port 121 and one end of the piston assembly 300 near the second core 500, so that when the main valve port 121 is closed, fluid can enter the valve cavity 140 of one side of the piston assembly 300 near the second core 500 through the second through hole 313 to increase the hydraulic pressure of the valve cavity 140 and increase the pressure of the piston assembly 300 to the main valve port 121.

When the coil 900 of the electromagnetic valve is powered off, the attraction force between the first iron core 400 and the second iron core 500 disappears, at this time, under the thrust of the second elastic member 800, the first iron core 400 moves in the direction away from the main valve port 121 and drives the valve core assembly 200 to open the pilot valve port 311, and the fluid above the piston assembly 300 flows to the flow path outlet 123 through the pilot valve port 311; and, the piston assembly 300 drives the second core 500 to slide upwards under the high pressure of the fluid in the flow path inlet 122, and at this time, the piston assembly 300 opens the main valve port 121.

In the solenoid valve of the present application, since both the first and second cores 400 and 500 are movably coupled with the valve housing 110.

In order to improve the assembly accuracy of the electromagnetic valve and improve the assembly efficiency of the electromagnetic valve. In one embodiment, as shown in FIG. 2, the valve cartridge assembly 200 includes a sealing portion 210 and a valve stem portion 220, and the valve cartridge assembly 200 is movably and sealingly engaged with the valve guide port 311 via the sealing portion 210. One end of the valve rod 220 is movably inserted into the first cavity 410 and can be stopped at one end of the first cavity 410 close to the second core 500, so as to prevent the valve rod 220 from being separated from the first cavity 410 from the lower end of the first core 400, the other end of the valve rod 220 passes through the second cavity 510 and is connected with the sealing part 210, and the sealing part 210 is stopped at one end of the second core 500 away from the first core 400, so as to limit the movement of the valve rod 220 and prevent the sealing part 210 from being separated from the second cavity 510 through the second cavity 510. In this way, the first core 400, the second core 500, the sealing portion 210 and the valve stem portion 220 can be assembled as a single body without being separated from each other, and then further assembled.

In the assembly process of the electromagnetic valve, the second elastic member 800 may be disposed between the first iron core 400 and the second iron core 500, the valve rod 220 may be sequentially inserted into the first cavity 410 and the second cavity 510, the sealing portion 210 may be mounted at one end of the valve rod 220 that extends out of the second cavity 510, and finally the first elastic member 700 may be disposed at one end of the first cavity 410 that is far away from the valve rod 220. Since the valve rod 220 is disposed at one end of the first cavity 410 and is in a limit fit with the first cavity 410, and the sealing portion 210 is stopped at one end of the second core 500 facing away from the first core 400, movement of the valve rod 220 is limited. Therefore, the first and second cores 400 and 500 and the valve cartridge assembly 200 can be assembled together under the limit of the valve cartridge assembly 200, and the first and second cores 400 and 500 and the valve cartridge assembly 200 are not disassembled without dismantling the sealing part 210. Thus, when the electromagnetic valve is assembled, the first iron core 400, the second iron core 500, the valve core assembly 200, the first elastic member 700 and the second elastic member 800 can be assembled to form an assembly body, and then the assembly body is integrally installed in the valve sleeve 110, so that the assembly precision of the electromagnetic valve is improved, and the assembly efficiency of the electromagnetic valve is improved.

Further, in an embodiment, as shown in fig. 2, the valve core assembly 200 further includes a limiting portion 230, the inner wall of the first cavity 410 is provided with a limiting protrusion 411 corresponding to the limiting portion 230, the limiting portion 230 is fixedly connected to the outer wall of the valve stem 220 or integrally formed with the valve stem 220, and the limiting portion 230 is movably matched with the inner wall of the first cavity 410 and can stop at one end of the limiting protrusion 411 away from the main valve port 121.

More specifically, the stopper 230 is guided to be engaged with the inner wall of the first chamber 410, so that the valve stem 220 can be prevented from being eccentric.

It should be noted that, in an embodiment, when the coil 900 is energized, the limiting portion 230 and the limiting protrusion 411 are spaced apart, so that when the coil 900 is de-energized, during the upward movement of the first core 400, there is a certain idle stroke between the limiting portion 230 and the limiting protrusion 411. So set up, on the one hand, can ensure that first iron core 400 is not stressed when upwards moving, guarantee that first iron core 400 has ascending motion impulse, promote the valve opening ability of solenoid valve. On the other hand, the stopper protrusion 411 does not block the stopper 230, and can ensure the sealing property when the valve port 311 is closed.

To further avoid the eccentricity of the valve core assembly 200, in an embodiment, as shown in fig. 2, the inner wall of the second iron core 500 is provided with a sealing guide hole 511 coaxially arranged with the second iron core, the inner diameter of the sealing guide hole 511 is larger than the inner diameter of the second cavity 510, a stop step 512 is formed between the sealing guide hole 511 and the second cavity 510, the sealing part 210 is in guiding fit with the inner wall of the sealing guide hole 511, and the sealing part 210 is stopped at the stop step 512.

In an embodiment, as shown in fig. 2, the sealing portion 210 includes a connector 211 and a sealing head 212, the connector 211 is clamped, screwed or welded to the valve stem 220, and the connector 211 can stop at one end of the second iron core 500 facing away from the first iron core 400, the sealing head 212 is mounted on the connector 211, and the sealing portion 210 is movably and hermetically matched with the pilot valve 311 through the sealing head 212. The sealing head 212 is made of rubber, silica gel or soft plastic.

In this way, the assembly of the seal portion 210 and the valve stem portion 220 is facilitated, and the tightness of the pilot valve port 311 can be made better.

Specifically, as shown in fig. 2, a clamping hole 2111 is provided at an end of the connector 211 facing the valve port 311, and the sealing head 212 is fixedly disposed in the clamping hole 2111.

In an embodiment, the height of the first core 400 protruding from the coil 900 is constantly greater than or equal to zero. Specifically, when the coil 900 of the solenoid valve is energized, the first plunger 400 is away from the vertical distance m between the end face of the second plunger 500 and the pilot valve port 311, and the coil 900 is away from the vertical distance n between the end face of the plunger assembly 300 and the pilot valve port 311, satisfying m > n. Since the vertical height of the first iron core 400 is the lowest when the coil 900 of the solenoid valve is energized, that is, the height of the upper end surface of the first iron core 400 is always higher than the height of the upper end surface of the coil 900 when the solenoid valve is vertically disposed.

In this way, when the height of the upper end surface of the first iron core 400 is lower than the height of the upper end surface of the coil 900, the coil 900 generates an upward suction force on the first iron core 400, and the suction force can prevent the first elastic member 700 from pushing the first iron core 400 downward. That is, so arranged, it is possible to prevent the coil 900 from obstructing the first elastic member 700 from pushing the first core 400 downward, that is, from being affected by the opening and closing of the solenoid valve.

In an embodiment, as shown in fig. 2, the piston assembly 300 includes a plug body 310, a sealing ring 320 and an extension portion 330, the piston assembly 300 is guided and matched with the inner wall of the valve cavity 140 through the plug body 310, the valve guide port 311, the first through hole 312 and the second through hole 313 are all disposed on the plug body 310, the extension portion 330 is fixedly disposed at one end of the plug body 310 near the main valve port 121, the extension portion 330 is provided with a channel hole 331, and the valve guide port 311 can be communicated with the main valve port 121 sequentially through the first through hole 312 and the channel hole 331. The sealing ring 320 is sleeved outside the extension 330, and the piston assembly 300 is movably and hermetically matched with the main valve opening 121 through the sealing ring 320.

This arrangement facilitates assembly of the seal ring 320 and reduces assembly difficulty of the piston assembly 300.

Similarly, in order to improve the sealing performance of the piston assembly 300, the seal ring 320 is made of rubber, silicone or soft plastic.

Further, as shown in fig. 2, the outer side of the plug 310 may further be provided with an integrally formed or fixedly connected surrounding edge 340, the inner side of the sealing ring 320 is sleeved on the extension portion 330, and the outer side of the sealing ring 320 abuts against the surrounding edge 340.

In one embodiment, as shown in FIG. 2, extension 330 is spaced from the vertical distance p between the end surface of pilot port 311 and pilot port 311, and the vertical distance q between main valve port 121 and pilot port 311 is satisfied, p > q. That is, when the solenoid valve is vertically disposed, the end surface of the extension 330, which is away from the pilot valve port 311, is lower in height than the main valve port 121.

In this way, when the piston assembly 300 moves in a direction away from the main valve port 121 to open the main valve port 121, a portion of the extension 330 can be located in the main valve port 121, which can effectively increase the pressure difference across the plug body 310, thereby reducing the movement resistance of the piston assembly 300. The lower the end surface of the extension 330 remote from the pilot port 311 relative to the main port 121, the greater the pressure differential across the piston assembly 300. When the main valve port 121 is opened, a larger pressure difference acts on the piston assembly 300, and the overall valve opening driving force can be reduced.

In one embodiment, as shown in fig. 2, the piston assembly 300 further includes a buffer ring 350, the buffer ring 350 is sleeved on the outer side of the extension portion 330, and the cross-sectional area of the buffer ring 350 tends to decrease from the sealing ring 320 to the head of the extension portion 330 (i.e. the end of the extension portion 330 away from the valve guiding port 311).

Specifically, the buffer ring 350 has a tapered cylindrical shape as a whole.

By the arrangement, the piston assembly 300 is beneficial to buffering the fluid, avoiding the fluid from generating turbulence and reducing the noise of the electromagnetic valve.

The application also provides an assembly method of the electromagnetic valve, which comprises the following steps:

The second elastic member 800 is disposed between the first core 400 and the second core 500;

The valve rod 220 is sequentially arranged in the first cavity 410 and the second cavity 510 in a penetrating manner from one end of the first cavity 410 far away from the second iron core 500, and one end of the valve rod 220 arranged in the first cavity 410 is in limit fit with the first cavity 410, so that the valve rod 220 cannot be separated from the lower part of the first iron core 400;

The sealing part 210 is installed at one end of the valve rod part 220 penetrating out of the second cavity 510, and the sealing part 210 is stopped outside the second cavity 510, so that the sealing part 210 cannot be separated from the second core 500 through the second cavity 510.

Further, the assembly method of the electromagnetic valve further comprises the following steps of

Mounting the piston assembly 300 to the interior cavity of the body portion 120;

Connecting the valve housing 110 with the valve cover 130;

placing the first elastic member 700 within the first cavity 410;

inserting one end of the ejector rod 600 into the first cavity 410, so that two ends of the first elastic member 700 are respectively abutted against the valve rod part 220 and the ejector rod 600; moreover, one end of the ejector pin 600 is engaged with the first iron core 400 in a limited manner, and one end of the ejector pin 600 cannot be separated from the upper portion of the first iron core 400;

The second elastic member 800, the first iron core 400, the second iron core 500, the sealing part 210, the valve rod part 220, the first elastic member and the ejector rod 600 are integrally placed in the valve sleeve 110, so that the other end of the ejector rod 600 is propped against the valve sleeve 110;

the valve cover 130 is connected to the main body 120.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be determined from the following claims.

Claims (10)

1. The electromagnetic valve is characterized by comprising a valve body assembly (100), wherein the valve body assembly (100) is provided with a valve cavity (140) and a main valve opening (121) capable of being communicated with the valve cavity (140), the electromagnetic valve further comprises a first iron core (400), a second iron core (500), a valve core assembly (200) and a piston assembly (300) which are arranged in the valve cavity (140), the first iron core (400) is provided with a first cavity (410), the second iron core (500) is provided with a second cavity (510), the piston assembly (300) is used for opening or closing the main valve opening (121), and one end, far away from the main valve opening (121), of the piston assembly (300) is provided with a valve guide opening (311);

The valve core assembly (200) comprises a sealing part (210) and a valve rod part (220), the valve core assembly (200) is in movable sealing fit with the pilot valve opening (311) through the sealing part (210), one end of the valve rod part (220) is movably inserted into the first cavity (410) and can be stopped in the first cavity (410), the other end of the valve rod part (220) penetrates through the second cavity (510) and is connected with the sealing part (210), and the sealing part (210) can be stopped outside the second cavity (510).

2. The solenoid valve of claim 1 further comprising a coil (900), wherein the first core (400) and the second core (500) are each movably disposed within the valve chamber (140); the height value of the first iron core (400) protruding out of the coil (900) is constantly larger than or equal to zero.

3. The electromagnetic valve according to claim 1, wherein the valve core assembly (200) further comprises a limiting portion (230), the inner wall of the first cavity (410) is provided with a limiting protrusion (411) corresponding to the limiting portion (230), the limiting portion (230) is connected to the outer side of the valve rod portion (220), and the limiting portion (230) is movably matched with the inner wall of the first cavity (410) and can be stopped at one end of the limiting protrusion (411) away from the main valve port (121).

4. The electromagnetic valve according to claim 1, characterized in that the sealing portion (210) comprises a connector (211) and a sealing head (212), the connector (211) is fixedly connected to the valve stem portion (220), and the connector (211) can be stopped at one end of the second iron core (500) facing away from the first iron core (400), and the sealing head (212) is mounted on the connector (211) and is in movable sealing fit with the pilot valve opening (311).

5. The electromagnetic valve according to claim 1, wherein the piston assembly (300) comprises a plug body (310), a sealing ring (320) and an extension part (330), the extension part (330) is fixedly arranged at one end of the plug body (310) close to the main valve opening (121), and the sealing ring (320) is sleeved at the outer side of the extension part (330) and is in movable sealing fit with the main valve opening (121);

The extension (330) is far away from the vertical distance p between the end face of the pilot valve port (311) and the pilot valve port (311), and the vertical distance q between the main valve port (121) and the pilot valve port (311) is satisfied, p > q.

6. The solenoid valve of claim 1, further comprising a pushrod (600) and a first elastic member (700), wherein one end of the pushrod (600) abuts against an inner wall of the valve body assembly (100) away from the main valve port (121), and the other end extends into the first cavity (410) and is in guiding fit with the inner wall of the first cavity (410), and the other end of the pushrod (600) is limited in the first cavity (410); the first elastic piece (700) is located in the first cavity (410), and two ends of the first elastic piece (700) are respectively abutted to the ejector rod (600) and the valve rod part (220).

7. The solenoid valve according to claim 1, characterized in that it further comprises a second elastic member (800), said second core (500) being provided with a mounting hole (513) facing said first core (400); at least part of the second elastic member (800) is positioned in the mounting hole (513); the first iron core (400) is provided with a protruding part (420), one end of the second elastic piece (800) is abutted against the second iron core (500), and the other end is abutted against the protruding part (420);

when the solenoid valve is in a closed state, at least part of the boss (420) is located in the mounting hole (513).

8. The electromagnetic valve according to claim 7, characterized in that the mounting hole (513) is provided in an end of the second cavity (510) near the first core (400), the diameter of the mounting hole (513) is larger than that of the second cavity (510), so that a first limit step (514) is formed between the mounting hole (513) and the second cavity (510), and an end of the second elastic member (800) abuts against the first limit step (514).

9. The solenoid valve of claim 7 wherein said mounting bore (513) includes a first bore section in communication with said second chamber (510) and a second bore section (515), said second bore section (515) being a counterbore and said second bore section (515) being disposed at an end of said mounting bore (513) proximate said first core (400), said second bore section (515) having a diameter greater than a diameter of said first bore section such that a second stop step (516) is formed between said first bore section and said second bore section (515), said boss (420) being in clearance fit with said second bore section (515), and at least a portion of said boss (420) being disposed within said second bore section (515) when a coil (900) of said solenoid valve is de-energized.

10. The solenoid valve of claim 1 wherein said valve body assembly (100) includes a valve housing (110), a body portion (120), and a valve cover (130), said valve housing (110) being connected to said body portion (120) by said valve cover (130);

The valve sleeve (110) comprises a main body section (111), a large-diameter section (113) and a variable-diameter section (112) connected with the main body section (111) and the large-diameter section (113), the diameter of the large-diameter section (113) is larger than that of the main body section (111), the valve sleeve (110) is provided with an inclined section matched with the variable-diameter section (112), and the distance between the variable-diameter section (112) and the inclined section is larger than or equal to zero.