Solenoid valve and assembly method therefor

Abstract

Disclosed is a solenoid valve (10), comprising a valve body assembly (100). The valve body assembly (100) is provided with a valve cavity (140) and a main valve port (121). The solenoid valve (10) further comprises a first iron core (400), a second iron core (500), a valve core assembly (200), and a piston assembly (300) which are provided in the valve cavity (140). One end of the piston assembly (300) is provided with a pilot valve port (311). The valve core assembly (200) comprises a sealing portion (210) and a valve rod portion (220), and the valve core assembly (200) is movably in sealing fit with the pilot valve port (311) by means of the sealing portion (210). One end of the valve rod portion (220) is inserted into a first cavity (410) and can stop inside the first cavity (410), the other end of the valve rod portion (220) passes through a second cavity (510) and is connected to the sealing portion (210), and the sealing portion (210) can stop outside the second cavity (510). The assembly precision of the solenoid valve can be improved, and the assembly efficiency of the solenoid valve can be improved. Also disclosed is an assembly method for the solenoid valve.

Description

Solenoid valve and assembly method thereof

[0001] Related applications

[0002] This application claims priority to Chinese patent application number 202311276497.5, filed on September 28, 2023, entitled “Solenoid Valve and Assembly Method Thereof,” the entire text of which is incorporated herein by reference. Technical Field

[0003] The present application relates to the technical field of solenoid valves, and in particular to a solenoid valve and an assembly method thereof. Background Art

[0004] In the solenoid valve in the related art, the valve core assembly is composed of many parts. When the solenoid valve is assembled, multiple parts need to be installed one by one into the valve sleeve. However, this will increase the assembly error of the entire solenoid valve, affect the assembly accuracy of the solenoid valve, and reduce the assembly efficiency of the solenoid valve.

[0005] Summary of the Invention

[0006] Based on this, it is necessary to provide a solenoid valve and an assembly method thereof to solve the problems of low assembly precision and low assembly efficiency of the solenoid valve.

[0007] The solenoid valve provided in the present application includes a valve body assembly, which is provided with a valve cavity and a main valve port capable of communicating with the valve cavity. The solenoid valve also includes a first iron core, a second iron core, a valve core assembly, and a piston assembly disposed within the valve cavity. 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 to open or close the main valve port, and the end of the piston assembly away from the main valve port is provided with a pilot valve port. The valve core assembly includes a sealing portion and a valve stem portion. The valve core assembly is movably sealed with the pilot valve port via the sealing portion. One end of the valve stem portion is movably inserted into the first cavity and can be stopped in the first cavity. The other end of the valve stem portion passes through the second cavity and is connected to the sealing portion, and the sealing portion can be stopped outside the second cavity.

[0008] In one embodiment, the solenoid valve further includes a coil, and the first iron core and the second iron core are both movably disposed in the valve cavity; the height of the first iron core protruding from the coil is constantly greater than or equal to zero.

[0009] In one embodiment, the valve core assembly also includes a limiting portion, and 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 stem portion, and the limiting portion is movably matched with the inner wall of the first cavity and can be stopped at the end of the limiting protrusion away from the main valve port.

[0010] In one embodiment, the sealing portion includes a connecting head and a sealing head. The connecting head is fixedly connected to the valve stem portion, and the connecting head can be stopped at the end of the second iron core away from the first iron core. The sealing head is installed on the connecting head and movably seals with the pilot valve port.

[0011] In one embodiment, the inner wall of the iron core is provided with a sealing guide hole coaxially arranged with the iron core, the inner diameter of the sealing guide hole is larger than the inner diameter of the second cavity, and a stop step is formed between the sealing guide hole and the second cavity, the sealing part and the inner wall of the sealing guide hole are guided and matched, and the sealing part stops at the stop step.

[0012] In one embodiment, the piston assembly includes a plug body, a sealing ring, and an extension. The extension is fixed to an end of the plug body proximate the main valve port. The sealing ring is sleeved on the outside of the extension and movably seals against the main valve port. The vertical distance between the end surface of the extension distal to the pilot valve port and the pilot valve port is defined as p, and the vertical distance between the main valve port and the pilot valve port is defined as q. The vertical distance p between the end surface of the extension distal to the pilot valve port and the pilot valve port and the vertical distance q between the main valve port and the pilot valve port satisfy the following conditions: p>q.

[0013] In one embodiment, the solenoid valve further includes a push rod and a first elastic member, one end of the push rod abuts against the inner wall of the valve body assembly away from the main valve port, and the other end extends into the first cavity and cooperates with the inner wall guide of the first cavity, and the other end of the push rod is limited to the first cavity; the first elastic member is located in the first cavity, and the two ends of the first elastic member respectively abut against the push rod and the valve stem portion.

[0014] In one embodiment, it also includes a push rod and a first elastic member. The push rod includes a rod body and an outer protrusion. The outer protrusion is fixedly connected to the outside of the rod body or is integrally formed with the rod body. The end of the first elastic member away from the valve core assembly 200 is stopped at the outer protrusion.

[0015] In one embodiment, the sealing portion includes a connecting head and a sealing head. A clamping hole is provided at one end of the connecting head facing the guide valve port, and the sealing head is fixed in the clamping hole.

[0016] In one embodiment, the solenoid valve also includes a second elastic member, the second iron core is provided with a mounting hole facing the first iron core; at least part of the second elastic member is located in the mounting hole; the first iron core is provided with a protrusion, one end of the second elastic member abuts against the second iron core, and the other end abuts against the protrusion; when the solenoid valve is in a closed state, at least part of the protrusion is located in the mounting hole.

[0017] In one embodiment, the second iron core is provided with a mounting hole coaxially arranged and connected to the second cavity, and the mounting hole is provided at one end of the second cavity close to the first iron core, and the diameter of the mounting hole is larger than the diameter of the second cavity, so that a first limiting step is formed between the mounting hole and the second cavity, and one end of the second elastic member abuts against the first limiting step.

[0018] In one embodiment, the mounting hole includes a first hole segment and a second hole segment, the first hole segment is connected to the second cavity, the second hole segment is an expanded hole, and the second hole segment is arranged at one end of the mounting hole close to the first iron core, the diameter of the second hole segment is larger than the diameter of the first hole segment, so that a second limiting step is formed between the first hole segment and the second hole segment, the protrusion is movably matched with the second hole segment, and when the coil is powered off, at least part of the protrusion is located in the second hole segment.

[0019] In one embodiment, a valve body assembly includes a valve sleeve, a main body, and a valve cover, wherein the valve sleeve is connected to the main body via the valve cover. The valve sleeve includes a main body section, a large diameter section, and a reducing section connecting the main body section and the large diameter section. The large diameter section has a larger diameter than the main body section. The valve sleeve has an inclined section that matches the reducing section, and the distance between the reducing section and the inclined section is greater than or equal to zero.

[0020] The present application also provides an assembly method for a solenoid valve, which is used to install the solenoid valve described in any one of the above embodiments. The assembly method includes the following steps: arranging a second elastic member between the first iron core and the second iron core; passing the valve stem portion from the end of the first cavity away from the second iron core through the first cavity and the second cavity in sequence, and making the end of the valve stem portion arranged in the first cavity cooperate with the first cavity limit so that the valve stem portion cannot detach from the lower part of the first iron core; installing a sealing portion at the end of the valve stem portion passing through the second cavity, and the sealing portion is stopped outside the second cavity so that the sealing portion cannot detach from the second iron through the second cavity.

[0021] In one embodiment, the valve body assembly includes a valve sleeve, a main body and a valve cover; the solenoid valve also includes a push rod and a first elastic member, and the piston assembly is installed in the inner cavity of the main body; the valve sleeve is connected to the valve cover; the first elastic member is placed in the first cavity; one end of the push rod is inserted into the first cavity, so that the two ends of the first elastic member are respectively abutted against the valve stem and the push rod; and one end of the push rod is limitedly engaged with the first iron core, and one end of the push rod cannot be detached from the upper part of the first iron core; the second elastic member, the first iron core, the second iron core, the sealing part, the valve stem, the first elastic member, and the push rod are placed in the valve sleeve as a whole, so that the other end of the push rod is abutted against the valve sleeve; and the valve cover is connected to the main body.

[0022] Compared to related art, the solenoid valve and assembly method provided in this application first install a second elastic member between the first and second cores, then insert the valve stem into the first and second cavities, respectively. Finally, a sealing member is installed at the end of the valve stem extending from the second cavity. Finally, the first elastic member is installed at the end of the first cavity away from the valve stem. Because the valve stem is positioned at one end of the first cavity, it engages with the first cavity, and the sealing member abuts the end of the second core facing away from the first core, restricting movement of the valve stem. Therefore, under the restraining action of the valve core assembly, the first and second cores, valve stem, and sealing member can be assembled together, and without removing the sealing member, the first and second cores, valve stem, and sealing member will not disassemble. Thus, during assembly of the solenoid valve, the first and second cores, valve stem, and sealing member can be assembled to form an assembly, which is then installed as a whole within the valve sleeve. This improves the assembly precision and efficiency of the solenoid valve.

[0023] The details of one or more embodiments of the present application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the present application will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the disclosed drawings without any creative work.

[0025] FIG1 is a schematic structural diagram of a solenoid valve according to an embodiment of the present application.

[0026] FIG2 is a cross-sectional view of a solenoid valve according to an embodiment of the present application.

[0027] Figure numerals: 10, solenoid valve; 100, valve body assembly; 110, valve sleeve; 111, main body section; 112, reducing section; 113, large diameter section; 120, main body; 121, main valve port; 122, flow path inlet; 123, flow path outlet; 130, valve cover; 140, valve chamber; 200, valve core assembly; 210, sealing portion; 211, connector; 2111, clamping hole; 212, sealing head; 220, valve stem; 230, limiting portion; 300, piston assembly; 310, plug body; 311, pilot valve port; 312, first through hole; 313, second through hole; 320, sealing ring; 330, extension portion; 331, channel hole; 340, surrounding edge; 350, buffer ring; 400, first iron core; 41 0. First cavity; 411. Limiting protrusion; 420. Protruding portion; 500. Second iron core; 510. Second cavity; 511. Sealing guide hole; 512. Stop step; 513. Mounting hole; 514. First limiting step; 515. Second hole section; 516. Second limiting step; 517. First hole section; 600. Push rod; 610. Rod body; 620. Outer protrusion; 700. First elastic member; 800. Second elastic member; 900. Coil. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0031] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0032] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] 1 and 2 , in one embodiment, a solenoid valve includes a valve body assembly 100, a valve core assembly 200, a piston assembly 300, a first iron core 400, a second iron core 500, and a push rod 600. The valve body assembly 100 includes a valve sleeve 110, a main body 120, and a valve cover 130. The valve sleeve 110 is fixedly connected to the valve cover 130 by welding or other connection methods, and the valve cover 130 is connected to the main body 120.

[0036] Furthermore, in one embodiment, the valve sleeve 110 includes a main body section 111, a large diameter section 113, and a reducing section 112 connecting the main body section 111 and the large diameter section 113. The diameter of the large diameter section 113 is larger than the diameter of the main body section 111, and the valve sleeve 110 is interference fit and welded with the valve cover 130 through the large diameter section 113.

[0037] It should be noted that because the diameter of the large-diameter section 113 is larger than that of the main body section 111, the diameter of the reducing section 112 tends to increase along the direction from the main body section 111 to the large-diameter section 113. To facilitate the connection between the valve sleeve 110 and the valve cover 130, the large-diameter section 113 and the valve cover 130 are interference-fitted and welded. Furthermore, the reducing section 112 and the valve cover 130 can be connected with either a close fit or a clearance fit, and the main body section 111 and the valve cover can be clearance-fitted or interference-fitted and welded, without specific limitations herein. The valve cover 130 is provided with an inclined section that matches the reducing section 112. The inclined section cooperates with the reducing section 112 to prevent the valve sleeve 110 from escaping from above the valve cover 130. Because the inclined angle of the reducing section 112 cannot be guaranteed to completely align with the inclined section of the tilting valve cover 130, the distance between the reducing section 112 and the inclined section is greater than or equal to zero, which means that the reducing section 112 cannot simultaneously function to connect with the valve cover 130 and prevent the valve sleeve 110 from falling out. Therefore, a large diameter section 113 can be added to connect with the valve cover 130 through the large diameter section 113, while the inclined section can still prevent the valve sleeve 110 from falling out from above the valve cover 130.

[0038] The valve body assembly 100 is provided with a valve chamber 140, in which the valve core assembly 200, piston assembly 300, first iron core 400, second iron core 500, and push rod 600 are all disposed. The main body 120 is provided with a main valve port 121, a flow path inlet 122, and a flow path outlet 123, which are respectively connected to the valve chamber 140. Fluid can sequentially enter the valve chamber 140 through the flow path inlet 122 and enter the flow path outlet 123 through the main valve port 121. One end of the piston assembly 300 is movably sealed with the main valve port 121 to open or close the main valve port 121. The end of the piston assembly 300 away from the main valve port 121 is provided with a pilot valve port 311. The piston assembly 300 also has a first through hole 312 connecting the pilot valve port 311 and the main valve port 121.

[0039] The first iron core 400 is disposed at one end of the valve sleeve 110 away from the main body 120. A portion of the second iron core 500 is disposed within the valve sleeve 110, while the other portion extends into the main body 120. The first iron core 400 defines a first cavity 410, and the second iron core 500 defines a second cavity 510. One end of the valve core assembly 200 is movably inserted into the first cavity 410, while the other end passes through the second cavity 510 and movably seals with the pilot valve port 311. A first elastic member 700 (including but not limited to a spring structure) is disposed between the push rod 600 and the valve core assembly 200. The first elastic member 700 is capable of applying an elastic force to the valve core assembly 200 away from the push rod 600.

[0040] In one embodiment, as shown in FIG2 , one end of the push rod 600 abuts against the inner wall of the valve sleeve 110 away from the main valve port 121, and the other end extends into the first cavity 410 and is guided by the inner wall of the first cavity 410. The other end of the push rod 600 is restrained within the first cavity 410. The first elastic member 700 is positioned within the first cavity 410, and the two ends of the first elastic member 700 respectively abut against the push rod 600 and the valve stem portion 220. The other end of the push rod 600 can be restrained by providing a riveted edge on the top of the first core 400.

[0041] In this way, the first elastic member 700 can always be located in the first cavity 410, thereby preventing the first elastic member 700 from extending out of the first cavity 410 and being easily bent and deformed, and further preventing the first elastic member 700 from bending and deforming and causing friction and fracture between itself and the first iron core 400. That is, such a setting improves the service life of the first elastic member 700.

[0042] In one embodiment, as shown in Figure 2, the push rod 600 includes a rod body 610 and an outer protrusion 620. The outer protrusion 620 is fixedly connected to the outside of the rod body 610 or is integrally formed with the rod body 610. The end of the first elastic member 700 away from the valve core assembly 200 is stopped at the outer protrusion 620.

[0043] 2 , a second elastic member 800 is disposed between the first core 400 and the second core 500. One end of the second elastic member 800 abuts the first core 400, and the other end abuts the second core 500, so as to apply thrust to the first core 400 and the second core 500 respectively.

[0044] By providing the second elastic member 800 , it is possible to ensure that when the solenoid valve is powered off, the second elastic member 800 can push open the valve core assembly 200 , thereby ensuring the opening of the pilot valve port 311 .

[0045] Furthermore, the second core 500 has a mounting hole 513 facing the first core 400. At least a portion of the second elastic member 800 is located within the mounting hole 513. The first core 400 has a protrusion 420. One end of the second elastic member 800 abuts the second core 500, while the other end abuts the protrusion. When the solenoid valve is in the closed state, at least a portion of the protrusion 420 is located within the mounting hole 513.

[0046] In one embodiment, as shown in Figure 2, the second iron core 500 is provided with a mounting hole 513 coaxially arranged and connected to the second cavity 510, and the mounting hole 513 is provided at one end of the second cavity 510 close to the first iron core 400, and the diameter of the mounting hole 513 is larger than the diameter 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 a portion of the second elastic member 800 is provided in the mounting hole 513, and one end of the second elastic member 800 abuts against the first limiting step 514, and the other end abuts against the first iron core 400.

[0047] This facilitates the installation of the second elastic member 800 .

[0048] Furthermore, the second elastic member 800 is sleeved on the outer side of the valve core assembly 200 .

[0049] Furthermore, in one embodiment, as shown in FIG2 , the mounting hole 513 includes a first hole section 517 and a second hole section 515. The first hole section 517 communicates with the second cavity 510. The second hole section 515 is a countersunk hole, coaxially arranged with and communicating with the mounting hole 513. The second hole section 515 is located at the end of the mounting hole 513 proximal to the first core 400. The diameter of the second hole section 515 is larger than the diameter of the first hole section 517, thereby forming a second limiting step 516 between the first and second hole sections 517 and 515. The protrusion 420 is movably engaged with the second hole section 515. When the solenoid valve coil 900 is de-energized, at least a portion of the protrusion 420 at the end away from the first core 400 extends into the second hole section 515. The protrusion 420 can limit the second elastic member 800, preventing it from disengaging from the mounting hole 513.

[0050] In this way, the second elastic member 800 can always be located in the second cavity 510, thereby preventing the second elastic member 800 from extending out of the second cavity 510 and being easily bent and deformed, and further preventing the second elastic member 800 from bending and deforming and causing friction and fracture between itself and the second iron core 500. That is, such a setting improves the service life of the second elastic member 800.

[0051] It should be noted that when the coil 900 of the solenoid valve is in a power-off 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 into a compressed state.

[0052] The working process of the solenoid valve is as follows: when the coil 900 of the solenoid valve is energized, 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 the electromagnetic force and attract each other. At this time, the first elastic member 700 stretches and pushes the valve core assembly 200 to move downward, so that the valve core assembly 200 contacts and closes the pilot valve port 311; thereafter, under the push of the first elastic member 700 and the liquid pressure, the valve core assembly 200 and the piston assembly 300 continue to move downward, and the piston assembly 300 closes the main valve port 121.

[0053] It should be noted that, as shown in Figure 2, the piston assembly 300 is also provided with a second through hole 313, which passes through one end of the piston assembly 300 close to the main valve port 121 and the end of the piston assembly 300 close to the second iron core 500. In this way, when the main valve port 121 is closed, the fluid can enter the valve chamber 140 on one side of the piston assembly 300 close to the second iron core 500 through the second through hole 313, so as to increase the hydraulic pressure of the valve chamber 140 on this side and increase the pressure of the piston assembly 300 on the main valve port 121.

[0054] When the coil 900 of the solenoid 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 away from the main valve port 121 and drives the valve core assembly 200 to open the pilot valve port 311. The fluid above the piston assembly 300 flows to the flow path outlet 123 through the pilot valve port 311. Moreover, under the high pressure of the fluid at the flow path inlet 122, the piston assembly 300 drives the second iron core 500 to slide upward. At this time, the piston assembly 300 opens the main valve port 121.

[0055] In the solenoid valve of the present application, the first iron core 400 and the second iron core 500 are both movably matched with the valve sleeve 110 .

[0056] In order to improve the assembly accuracy and efficiency of the solenoid valve, in one embodiment, as shown in FIG2 , the valve core assembly 200 includes a sealing portion 210 and a valve stem portion 220. The valve core assembly 200 is movably sealed with the pilot valve port 311 via the sealing portion 210. One end of the valve stem portion 220 is movably inserted into the first cavity 410 and can be stopped at the end of the first cavity 410 near the second core 500 to prevent the valve stem portion 220 from escaping from the first cavity 410 from the lower end of the first core 400. The other end of the valve stem portion 220 passes through the second cavity 510 and connects to the sealing portion 210. The sealing portion 210 is stopped at the end of the second core 500 away from the first core 400 to limit the movement of the valve stem portion 220 and prevent the sealing portion 210 from escaping from the second cavity 510 through the second cavity 510. In this way, the first iron core 400 , the second iron core 500 , the sealing portion 210 and the valve stem portion 220 can be assembled into a whole that does not separate from each other before proceeding to the next step of installation.

[0057] During assembly of the solenoid valve, the second elastic member 800 can be first installed between the first core 400 and the second core 500. The valve stem 220 is then sequentially inserted into the first cavity 410 and the second cavity 510. The sealing member 210 is then installed at the end of the valve stem 220 that extends out of the second cavity 510. Finally, the first elastic member 700 can be installed at the end of the first cavity 410 away from the valve stem 220. Because the valve stem 220 is positioned at one end of the first cavity 410 and engages with the first cavity 410, and the sealing member 210 abuts against the end of the second core 500 that faces away from the first core 400, movement of the valve stem 220 is restricted. Therefore, under the restraining action of the valve core assembly 200, the first core 400, the second core 500, and the valve core assembly 200 can be assembled together, and without removing the sealing member 210, the first core 400, the second core 500, and the valve core assembly 200 will not disassemble. In this way, when assembling the solenoid valve, 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, and then the above-mentioned assembly can be installed as a whole in the valve sleeve 110, which is beneficial to improve the assembly accuracy of the solenoid valve and improve the assembly efficiency of the solenoid valve.

[0058] In one embodiment, as shown in Figure 2, the valve core assembly 200 also includes a limiting portion 230, and 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 portion 220 or is integrally formed with the valve stem portion 220, and the limiting portion 230 is movably matched with the inner wall of the first cavity 410 and can be stopped at the end of the limiting protrusion 411 away from the main valve port 121.

[0059] In one embodiment, the limiting portion 230 and the inner wall of the first cavity 410 are guided and matched, thereby preventing the valve stem portion 220 from being eccentric.

[0060] It should be noted that in one embodiment, when the coil 900 is energized, the limiting portion 230 and the limiting protrusion 411 are spaced apart. This allows for a period of idle travel between the limiting portion 230 and the limiting protrusion 411 during the upward movement of the first core 400 when the coil 900 is de-energized. This arrangement, on the one hand, ensures that the first core 400 is not subjected to force during upward movement, ensuring upward momentum and enhancing the solenoid valve's ability to open. On the other hand, the limiting protrusion 411 does not obstruct the limiting portion 230, ensuring a tight seal when the pilot valve port 311 is closed.

[0061] In order to further prevent the valve core assembly 200 from being eccentric, in one embodiment, as shown in Figure 2, the inner wall of the second iron core 500 is provided with a sealing guide hole 511 coaxially arranged with itself, the inner diameter of the sealing guide hole 511 is larger than the inner diameter of the second cavity 510, and a stop step 512 is formed between the sealing guide hole 511 and the second cavity 510, the sealing portion 210 and the inner wall guide of the sealing guide hole 511 are matched, and the sealing portion 210 stops at the stop step 512.

[0062] In one embodiment, as shown in FIG2 , the sealing portion 210 includes a connector 211 and a sealing head 212. The connector 211 is snap-fitted, screwed, or welded to the valve stem 220 and can be stopped at the end of the second core 500 facing away from the first core 400. The sealing head 212 is mounted on the connector 211, and the sealing portion 210 is movably and sealingly engaged with the pilot valve port 311 via the sealing head 212. The sealing head 212 is made of rubber, silicone, or soft plastic.

[0063] This facilitates the assembly of the sealing portion 210 and the valve stem portion 220 and improves the sealing performance of the pilot valve port 311 .

[0064] In one embodiment, as shown in FIG. 2 , a locking hole 2111 is defined at one end of the connector 211 facing the pilot valve port 311 , and the sealing head 212 is fixedly disposed in the locking hole 2111 .

[0065] In one 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 vertical distance between the end surface of the first core 400 away from the second core 500 and the pilot valve port 311 is defined as m, and the vertical distance between the end surface of the coil 900 away from the piston assembly 300 and the pilot valve port 311 is defined as n. The vertical distance m between the end surface of the first core 400 away from the second core 500 and the pilot valve port 311 and the vertical distance n between the end surface of the coil 900 away from the piston assembly 300 and the pilot valve port 311 satisfy the following relationship: m>n. Since the vertical height of the first core 400 is lowest when the coil 900 of the solenoid valve is energized, that is, when the solenoid valve is vertically positioned, the height of the upper end surface of the first core 400 is always higher than the height of the upper end surface of the coil 900.

[0066] This prevents the coil 900 from exerting an upward suction force on the first core 400 when the upper end surface of the first core 400 is lower than the upper end surface of the coil 900. This suction force would hinder the first elastic member 700 from pushing the first core 400 downward. In other words, this arrangement prevents the coil 900 from hindering the first elastic member 700 from pushing the first core 400 downward, thereby preventing the opening and closing of the solenoid valve from being affected.

[0067] In one embodiment, as shown in FIG2 , the piston assembly 300 includes a plug body 310 , a sealing ring 320 , and an extension 330 . The piston assembly 300 is guided by the plug body 310 and the inner wall of the valve cavity 140 . The pilot valve port 311 , the first through hole 312 , and the second through hole 313 are all provided on the plug body 310 . The extension 330 is fixed to one end of the plug body 310 near the main valve port 121 , and is provided with a passage hole 331 . The pilot valve port 311 can be connected to the main valve port 121 in sequence through the first through hole 312 and the passage hole 331 . The sealing ring 320 is sleeved on the outside of the extension 330 , and the piston assembly 300 is movably sealed with the main valve port 121 through the sealing ring 320 .

[0068] Such a configuration facilitates the assembly of the sealing ring 320 and reduces the difficulty of assembling the piston assembly 300 .

[0069] Likewise, in order to improve the sealing performance of the piston assembly 300 , the sealing ring 320 is made of rubber, silicone or soft plastic.

[0070] In one embodiment, as shown in FIG. 2 , an integrally formed or fixedly connected rim 340 may be further provided on the outer side of the plug body 310 , 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 rim 340 .

[0071] In one embodiment, as shown in FIG2 , the vertical distance between the end surface of the extension portion 330 away from the pilot valve port 311 and the pilot valve port 311 is defined as p, and the vertical distance between the main valve port 121 and the pilot valve port 311 is defined as q. The vertical distance p between the end surface of the extension portion 330 away from 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 satisfy the following relationship: p>q. That is, when the solenoid valve is vertically positioned, the height of the end surface of the extension portion 330 away from the pilot valve port 311 is lower than the height of the main valve port 121.

[0072] As a result, when the piston assembly 300 moves away from the main valve port 121 to open it, a portion of the extension portion 330 can be located within the main valve port 121, effectively increasing the pressure differential across the plug body 310 and thereby reducing the resistance to movement of the piston assembly 300. The lower the end surface of the extension portion 330, away from the pilot valve port 311, is positioned relative to the main valve port 121, the greater the pressure differential across the piston assembly 300. When the main valve port 121 is opened, the greater the pressure differential acting on the piston assembly 300 reduces the overall valve-opening driving force.

[0073] In one embodiment, as shown in FIG2 , the piston assembly 300 further includes a buffer ring 350 , which is sleeved on the outside of the extension portion 330 . 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 pilot valve port 311 ).

[0074] In one embodiment, the buffer ring 350 is in a tapered cylindrical shape as a whole.

[0075] Such a configuration is beneficial for the piston assembly 300 to buffer the fluid, avoid turbulence of the fluid, and reduce the noise of the solenoid valve.

[0076] The present application also provides an assembly method for an electromagnetic valve, which includes the following steps: arranging a second elastic member 800 between the first iron core 400 and the second iron core 500; passing the valve stem portion 220 from one end of the first cavity 410 away from the second iron core 500 through the first cavity 410 and the second cavity 510 in sequence, and making the end of the valve stem portion 220 arranged in the first cavity 410 cooperate with the first cavity 410 to limit the valve stem portion 220 so that the valve stem portion 220 cannot detach from the lower part of the first iron core 400; installing a sealing portion 210 at one end of the valve stem portion 220 passing through the second cavity 510, and the sealing portion 210 is stopped outside the second cavity 510 so that the sealing portion 210 cannot detach from the second iron core 500 through the second cavity 510.

[0077] Furthermore, the assembly method of the solenoid valve also includes the following steps: installing the piston assembly 300 to the inner cavity of the main body 120; connecting the valve sleeve 110 with the valve cover 130; placing the first elastic member 700 in the first cavity 410; inserting one end of the push rod 600 into the first cavity 410, so that the two ends of the first elastic member 700 respectively abut against the valve stem portion 220 and the push rod 600; and, making one end of the push rod 600 limitedly engaged with the first iron core 400, and one end of the push rod 600 cannot be detached from the upper part of the first iron core 400; placing the second elastic member 800, the first iron core 400, the second iron core 500, the sealing portion 210, the valve stem portion 220, the first elastic member, and the push rod 600 as a whole into the valve sleeve 110, so that the other end of the push rod 600 abuts against the valve sleeve 110; and connecting the valve cover 130 to the main body 120.

[0078] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

Claims

1. A solenoid valve, characterized in that: The solenoid valve comprises a valve body assembly, wherein the valve body assembly is provided with a valve cavity and a main valve port capable of communicating with the valve cavity, the solenoid valve further comprises a first iron core, a second iron core, a valve core assembly and a piston assembly arranged in the valve cavity, 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 to open or close the main valve port, and a pilot valve port is provided at one end of the piston assembly away from the main valve port; The valve core assembly includes a sealing portion and a valve stem portion, and the valve core assembly is movably sealed with the pilot valve port through the sealing portion. One end of the valve stem portion is movably inserted into the first cavity and can be stopped in the first cavity, and the other end of the valve stem portion passes through the second cavity and is connected to the sealing portion, and the sealing portion can be stopped outside the second cavity.

2. The solenoid valve according to claim 1, wherein: It also includes a coil, and the first iron core and the second iron core can be movably arranged in the valve cavity; the height of the first iron core protruding from the coil is constantly greater than or equal to zero.

3. The solenoid valve according to claim 1, wherein: The valve core assembly also includes a limiting portion, and 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 stem portion, and the limiting portion is movably matched with the inner wall of the first cavity and can be stopped at the end of the limiting protrusion away from the main valve port.

4. The solenoid valve according to claim 1, wherein: The sealing part includes a connecting head and a sealing head. The connecting head is fixedly connected to the valve stem part, and the connecting head can be stopped at an end of the second iron core away from the first iron core. The sealing head is installed on the connecting head and cooperates with the pilot valve port in a movable seal.

5. The solenoid valve according to claim 1, wherein: The inner wall of the second iron core is provided with a sealing guide hole coaxially arranged with the second iron core, the inner diameter of the sealing guide hole is larger than the inner diameter of the second cavity, and a stop step is formed between the sealing guide hole and the second cavity, the sealing portion and the inner wall of the sealing guide hole are guided and matched, and the sealing portion stops at the stop step.

6. The solenoid valve according to claim 1, wherein: 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 movably sealed with the main valve port; A vertical distance between an end surface of the extension portion away from the pilot valve port and the pilot valve port is defined as p, and a vertical distance between the main valve port and the pilot valve port is defined as q. The vertical distance p between the end surface of the extension portion away from the pilot valve port and the pilot valve port and the vertical distance q between the main valve port and the pilot valve port satisfy: p>q.

7. The solenoid valve according to claim 1, wherein: It also includes a push rod and a first elastic member, one end of the push rod abuts against the inner wall of the valve body assembly away from the main valve port, the other end extends into the first cavity and cooperates with the inner wall guide of the first cavity, and the other end of the push rod is limited to the first cavity; the first elastic member is located in the first cavity, and the two ends of the first elastic member respectively abut against the push rod and the valve stem part.

8. The solenoid valve according to claim 1, wherein: It also includes a push rod and a first elastic member, the push rod includes a rod body and an outer protrusion, the outer protrusion is fixedly connected to the outside of the rod body or is integrally formed with the rod body, and one end of the first elastic member away from the valve core assembly stops at the outer protrusion.

9. The solenoid valve according to claim 1, wherein: The sealing part comprises a connecting head and a sealing head. A clamping hole is arranged at one end of the connecting head facing the pilot valve port, and the sealing head is fixed in the clamping hole.

10. The solenoid valve according to claim 1, wherein: It also includes a second elastic member, the second iron core is provided with a mounting hole facing the first iron core; at least part of the second elastic member is located in the mounting hole; the first iron core is provided with a protrusion, one end of the second elastic member abuts against the second iron core, and the other end abuts against the protrusion; When the solenoid valve is in a closed state, at least a portion of the protrusion is located in the mounting hole.

11. The solenoid valve according to claim 10, wherein: The mounting hole is arranged at one end of the second cavity close to the first iron core, and the diameter of the mounting hole is larger than the diameter of the second cavity, so that a first limiting step is formed between the mounting hole and the second cavity, and one end of the second elastic member abuts against the first limiting step.

12. The solenoid valve according to claim 10, wherein: The mounting hole includes a first hole section and a second hole section, the first hole section is connected to the second cavity, the second hole section is an expanded hole, and the second hole section is arranged at one end of the mounting hole close to the first iron core, the diameter of the second hole section is larger than the diameter of the first hole section, so that a second limiting step is formed between the first hole section and the second hole section, the protrusion is movably matched with the second hole section, and when the coil of the solenoid valve is powered off, at least part of the protrusion is located in the second hole section.

13. The solenoid valve according to claim 1, wherein: The valve body assembly comprises a valve sleeve, a main body and a valve cover, wherein the valve sleeve is connected to the main body through the valve cover; The valve sleeve comprises a main body section, a large diameter section and a reducing section connecting the main body section and the large diameter section, the diameter of the large diameter section is larger than the diameter of the main body section, the valve sleeve is provided with an inclined section matching the reducing section, and the distance between the reducing section and the inclined section is greater than or equal to zero.

14. A method for assembling a solenoid valve, characterized in that: For installing the solenoid valve according to any one of claims 1 to 13, the assembly method comprises the following steps: The second elastic member is provided between the first iron core and the second iron core; The end of the valve stem away from the second core in the first cavity is sequentially inserted into the first cavity and the second cavity, and the end of the valve stem disposed in the first cavity is limitedly matched with the first cavity, so that the valve stem cannot be separated from the lower part of the first core; A sealing part is installed at one end of the valve stem part passing through the second cavity, and the sealing part is stopped outside the second cavity so that the sealing part cannot pass through the second cavity and separate from the second iron core.

15. The method for assembling a solenoid valve according to claim 14, wherein: The valve body assembly includes a valve sleeve, a main body and a valve cover; The solenoid valve further includes a push rod and a first elastic member. Installing the piston assembly into the inner cavity of the main body; Connecting the valve sleeve to the valve cover; placing the first elastic member in the first cavity; Insert one end of the push rod into the first cavity so that the two ends of the first elastic member abut against the valve stem and the push rod respectively; and make one end of the push rod engage with the first iron core so that the one end of the push rod cannot be separated from the upper part of the first iron core; Put the second elastic member, the first iron core, the second iron core, the sealing part, the valve stem part, the first elastic member, and the push rod into the valve sleeve as a whole, so that the other end of the push rod abuts against the valve sleeve; The valve cover is connected to the main body.

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