Electromagnetic valve and assembling method thereof

Abstract

The invention relates to an electromagnetic valve and an assembling method thereof.The electromagnetic valve comprises a valve body assembly, the valve body assembly is provided with a valve cavity and a main valve port capable of communicating with the valve cavity, the electromagnetic valve further comprises a first iron core, a second iron core, a valve element assembly and a piston assembly which are arranged in the valve cavity, the first iron core is provided with a first cavity, and the second iron core is provided with a second cavity; the piston assembly is used for opening or closing the main valve port. A pilot valve port is formed in the end, away from the main valve port, of the piston assembly. The valve element assembly comprises a sealing part and a valve rod part, the valve element assembly is in movable sealing fit with the guide valve port through the sealing part, 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. According to the electromagnetic valve and the assembling method thereof, the problems that the assembling precision of the electromagnetic valve is low, and the assembling efficiency of the electromagnetic valve is low are solved.

Description

Technical Field

[0001] 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

[0002] In the existing solenoid valve, there are many parts that make up the valve core assembly. When the solenoid valve is assembled, multiple parts need to be installed into the valve sleeve one by one. 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. Summary of the invention

[0003] 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.

[0004] The solenoid valve provided in the present application includes a valve body assembly, the valve body assembly is provided with a valve cavity and a main valve port that can communicate 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 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 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 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, 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.

[0005] In one embodiment, the solenoid valve further comprises a coil, and the first iron core and the second iron core are both movably disposed in the valve cavity; and the height of the first iron core protruding from the coil is constantly greater than or equal to zero.

[0006] 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.

[0007] In one embodiment, 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 stop at one end of the second core away from the first core. The sealing head is installed on the connecting head and cooperates with the pilot valve port in a movable seal.

[0008] In one embodiment, the piston assembly includes 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 outside of the extension part and is movably sealed with the main valve port. The vertical distance p between the end surface of the extension part 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.

[0009] In one embodiment, the solenoid valve 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.

[0010] 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.

[0011] 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 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.

[0012] 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.

[0013] In one embodiment, the valve body assembly includes a valve sleeve, a main body and a valve cover, and the valve sleeve is connected to the main body through 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 diameter of the large diameter section is larger than the diameter of the main body section, and 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.

[0014] The present application also provides a solenoid valve assembly method for installing the solenoid valve described in any one of the above embodiments, the assembly method comprising the following steps:

[0015] The second elastic member is arranged between the first iron core and the second iron core;

[0016] 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;

[0017] 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.

[0018] 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 matched with the first iron core, and one end of the push rod cannot be separated 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; the valve cover is connected to the main body.

[0019] Compared with the prior art, the solenoid valve and its assembly method provided by the present application, during the assembly process of the solenoid valve, the second elastic member can be firstly arranged between the first iron core and the second iron core, and then the valve stem part is sequentially arranged in the first cavity and the second cavity, and then the sealing part is installed at the end of the valve stem part passing through the second cavity, and finally, the first elastic member can be arranged at the end of the first cavity away from the valve stem part. Since the valve stem part is arranged at one end of the first cavity and cooperates with the first cavity in a limiting manner, and the sealing part stops at the end of the second iron core away from the first iron core to limit the movement of the valve stem part. Therefore, under the limiting action of the valve core assembly, the first iron core, the second iron core, the valve stem and the sealing part can be assembled together, and without removing the sealing part, the first iron core, the second iron core, the valve stem and the sealing part will not disintegrate. In this way, when assembling the solenoid valve, the first iron core, the second iron core, the valve stem and the sealing part can be assembled to form an assembly, and then the above-mentioned assembly can be installed as a whole in the valve sleeve, which is conducive to improving the assembly accuracy of the solenoid valve, and improving the assembly efficiency of the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic diagram of the structure of a solenoid valve according to an embodiment of the present application;

[0022] Figure 2 A cross-sectional view of a solenoid valve according to an embodiment of the present application.

[0023] Reference numerals: 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; 32 0. Sealing ring; 330. Extension portion; 331. Channel hole; 340. Edge; 350. Buffer ring; 400. First iron core; 410. First cavity; 411. Limiting protrusion; 420. Protrusion; 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; 600. Push rod; 610. Rod body; 620. Outer protrusion; 700. First elastic member; 800. Second elastic member; 900. Coil. DETAILED DESCRIPTION

[0024] 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 referred device or element 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.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature 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. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] 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 a central 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 a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0030] See also Figure 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 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.

[0031] 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 large diameter section 113 and the valve cover 130.

[0032] It should be noted that, since the diameter of the large diameter section 113 is larger than the diameter 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. In order 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 fit and welded, and the reducing section 112 and the valve cover 130 can be fitted or gap fit, and the main body section 111 and the valve cover can be gap fit or interference fit and welded, which are not specifically limited here. The valve cover 130 is provided with an inclined section matching the reducing section 112, and the inclined section cooperates with the reducing section 112 to prevent the valve sleeve 110 from slipping out from the top of the valve cover 130. Since it is impossible to ensure that the inclination angle of the reducing section 112 can completely fit and connect 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, that is, the reducing section 112 cannot simultaneously have the functions of connecting with the valve cover 130 and preventing the valve sleeve 110 from coming out. Therefore, a large diameter section 113 can be added, and the large diameter section 113 can be connected with the valve cover 130, and the inclined section can still play the role of preventing the valve sleeve 110 from coming out from above the valve cover 130.

[0033] 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 push rod 600 are all provided in the valve cavity 140, and the main body 120 is provided with a main valve port 121, a flow path inlet 122 and a flow path outlet 123 which can be respectively connected to the valve cavity 140, and the fluid can enter the valve cavity 140 through the flow path inlet 122 in sequence, and can 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, and the end of the piston assembly 300 away from the main valve port 121 is provided with a pilot valve port 311, and the piston assembly 300 is also provided with a first through hole 312 connecting the pilot valve port 311 and the main valve port 121.

[0034] The first iron core 400 is disposed at one end of the valve sleeve 110 away from the main body 120, and a part of the second iron core 500 is disposed in the valve sleeve 110, and the other part extends into the main body 120. The first iron core 400 is provided with a first cavity 410, and 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, and the other end passes through the second cavity 510 and is movably sealed with the pilot valve port 311. A first elastic member 700 (including but not limited to a spring structure) is provided between the push rod 600 and the valve core assembly 200, and the first elastic member 700 can exert an elastic force on the valve core assembly 200 away from the push rod 600.

[0035] Specifically, Figure 2 As shown, 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 cooperates with the inner wall of the first cavity 410. The other end of the push rod 600 is limited in the first cavity 410, and the first elastic member 700 is located in the first cavity 410. The two ends of the first elastic member 700 respectively abut against the push rod 600 and the valve stem 220. The other end of the push rod 600 can be limited by setting a riveted edge on the top of the first iron core 400.

[0036] In this way, the first elastic member 700 can be always 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, thereby 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 configuration improves the service life of the first elastic member 700.

[0037] More specifically, if Figure 2 As shown, 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 , and one end of the first elastic member 700 away from the valve core assembly 200 stops at the outer protrusion 620 .

[0038] like Figure 2 As shown, 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 against the first core 400, and the other end abuts against the second core 500, so as to apply thrust to the first core 400 and the second core 500 respectively.

[0039] By providing the second elastic member 800 , it can be ensured 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 .

[0040] 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 protrusion 420, one end of the second elastic member 800 abuts against the second core 500, and the other end abuts against the protrusion. When the solenoid valve is in a closed state, at least part of the protrusion 420 is located in the mounting hole 513.

[0041] Specifically, Figure 2 As shown, the second iron core 500 is provided with a mounting hole 513 which is coaxially arranged and connected to the second cavity 510, and the mounting hole 513 is arranged 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 part of the second elastic member 800 is arranged 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.

[0042] This is beneficial for the installation of the second elastic member 800 .

[0043] Furthermore, the second elastic member 800 is sleeved on the outer side of the valve core assembly 200 .

[0044] Furthermore, in one embodiment, if Figure 2 As shown, the mounting hole 513 includes a first hole section and a second hole section 515, the first hole section is connected to the second cavity 510, the second hole section 515 is an expanded hole, the second hole section 515 is coaxially arranged and connected to the mounting hole 513, and the second hole section 515 is arranged at one end of the mounting hole 513 close to the first iron 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 protrusion 420 is movably matched with the second hole section 515, and when the coil 900 of the solenoid valve is powered off, at least part of the protrusion 420 extends into the second hole section 515 away from the end of the first iron core 400. The protrusion 420 can limit the second elastic member 800 to prevent the second elastic member 800 from detaching from the mounting hole 513.

[0045] In this way, the second elastic member 800 can be always 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, thereby 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 configuration improves the service life of the second elastic member 800.

[0046] 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 in a compressed state.

[0047] The working process of the solenoid valve is as follows:

[0048] 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.

[0049] Afterwards, under the driving action 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;

[0050] It should be noted that if Figure 2 As shown, the piston assembly 300 is also provided with a second through hole 313, and the second through hole 313 passes through one end of the piston assembly 300 close to the main valve port 121 and one 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 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.

[0051] 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.

[0052] In the solenoid valve of the present application, the first iron core 400 and the second iron core 500 are movably matched with the valve sleeve 110 .

[0053] In order to improve the assembly accuracy of the solenoid valve and the assembly efficiency of the solenoid valve. Figure 2As shown, the valve core assembly 200 includes a sealing portion 210 and a valve stem portion 220, and the valve core assembly 200 is movably sealed with the pilot valve port 311 through 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 one end of the first cavity 410 close to the second iron core 500 to prevent the valve stem portion 220 from being separated from the first cavity 410 from the lower end of the first iron core 400, and the other end of the valve stem portion 220 passes through the second cavity 510 and is connected to the sealing portion 210, and the sealing portion 210 is stopped at one end of the second iron core 500 away from the first iron core 400 to limit the movement of the valve stem portion 220 and prevent the sealing portion 210 from being separated 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 the next step of installation.

[0054] During the assembly of the solenoid valve, the second elastic member 800 may be firstly arranged between the first iron core 400 and the second iron core 500, and then the valve stem 220 may be sequentially arranged in the first cavity 410 and the second cavity 510, and then the sealing member 210 may be installed at one end of the valve stem 220 that passes through the second cavity 510, and finally, the first elastic member 700 may be arranged at one end of the first cavity 410 away from the valve stem 220. Since the valve stem 220 is arranged at one end of the first cavity 410 and is limitedly matched with the first cavity 410, and the sealing member 210 is stopped at one end of the second iron core 500 away from the first iron core 400, so as to limit the movement of the valve stem 220. Therefore, under the limiting action of the valve core assembly 200, the first iron core 400, the second iron core 500 and the valve core assembly 200 can be assembled together, and without removing the sealing member 210, the first iron core 400, the second iron core 500 and the valve core assembly 200 will not disintegrate. 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, as well as improve the assembly efficiency of the solenoid valve.

[0055] Further, in one embodiment, if Figure 2 As shown, 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.

[0056] More specifically, the limiting portion 230 and the inner wall of the first cavity 410 cooperate with each other in a guiding manner, so that the valve stem portion 220 can be prevented from being eccentric.

[0057] It should be noted that, in one embodiment, when the coil 900 is powered on, the limiting portion 230 and the limiting protrusion 411 are spaced apart, so that when the coil 900 is powered off, there is an idle stroke between the limiting portion 230 and the limiting protrusion 411 during the upward movement of the first iron core 400. Such a configuration can, on the one hand, ensure that the first iron core 400 is not subjected to force when moving upward, ensure that the first iron core 400 has an upward movement impulse, and improve the valve opening capacity of the solenoid valve. On the other hand, the limiting protrusion 411 will not block the limiting portion 230, and can ensure the sealing of the pilot valve port 311 when it is closed.

[0058] In order to further prevent the valve core assembly 200 from being eccentric, in one embodiment, Figure 2 As shown, the inner wall of the second iron core 500 is provided with a sealing guide hole 511 which is 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 part 210 and the inner wall guide of the sealing guide hole 511 are matched, and the sealing part 210 stops at the stop step 512.

[0059] In one embodiment, if Figure 2 As shown, the sealing part 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 be stopped at one end of the second iron core 500 away from the first iron core 400. The sealing head 212 is installed on the connector 211, and the sealing part 210 is movably sealed with the pilot valve port 311 through the sealing head 212. The sealing head 212 is made of rubber, silicone or soft plastic.

[0060] This is beneficial to the assembly of the sealing portion 210 and the valve stem portion 220 , and can improve the sealing performance of the pilot valve port 311 .

[0061] Specifically, Figure 2 As shown, a clamping hole 2111 is provided at one end of the connecting head 211 facing the guide valve port 311 , and the sealing head 212 is fixedly disposed in the clamping hole 2111 .

[0062] In one embodiment, the height value of the first iron core 400 protruding from the coil 900 is constant and greater than or equal to zero. Specifically, when the coil 900 of the solenoid valve is energized, the vertical distance m between the end face of the first iron core 400 away from the second iron core 500 and the pilot valve port 311, and the vertical distance n between the end face of the coil 900 away from the piston assembly 300 and the pilot valve port 311 satisfy m>n. Since when the coil 900 of the solenoid valve is energized, the vertical height of the first iron core 400 is the lowest, that is, when the solenoid valve is set vertically, the height of the upper end face of the first iron core 400 is always higher than the height of the upper end face of the coil 900.

[0063] 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 will hinder the first elastic member 700 from pushing the first iron core 400 downward. In other words, such a configuration can prevent the coil 900 from hindering the first elastic member 700 from pushing the first iron core 400 downward, that is, avoid the opening and closing of the electromagnetic valve from being affected.

[0064] In one embodiment, if Figure 2 As shown, the piston assembly 300 includes a plug body 310, a sealing ring 320 and an extension 330. The piston assembly 300 is guided and matched with the inner wall of the plug body 310 and 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 fixedly provided at one end of the plug body 310 close to the main valve port 121, and the extension 330 is provided with a channel 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 channel hole 331. The sealing ring 320 is sleeved on the outer side of the extension 330, and the piston assembly 300 is movably sealed and matched with the main valve port 121 through the sealing ring 320.

[0065] Such a configuration is conducive to the assembly of the sealing ring 320 and reduces the difficulty of assembling the piston assembly 300 .

[0066] Similarly, in order to improve the sealing performance of the piston assembly 300, the sealing ring 320 is made of rubber, silicone or soft plastic.

[0067] Furthermore, if Figure 2 As shown, the outer side of the plug body 310 may also be provided with an integrally formed or fixedly connected peripheral 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 peripheral edge 340 .

[0068] In one embodiment, if Figure 2 As shown, 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, p>q. That is, when the solenoid valve is vertically arranged, 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.

[0069] 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 part of the extension portion 330 can be located in the main valve port 121, which can effectively increase the pressure difference on both sides of the plug body 310, thereby reducing the movement resistance of the piston assembly 300. The lower the position of the end surface of the extension portion 330 away from the pilot valve port 311 relative to the main valve port 121, the greater the pressure difference between the two ends of the piston assembly 300. When the main valve port 121 is opened, a large pressure difference acts on the piston assembly 300, which can reduce the overall valve opening driving force.

[0070] In one embodiment, if Figure 2 As shown, the piston assembly 300 also includes a buffer ring 350, which is sleeved on the outer side 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 (that is, the end of the extension portion 330 away from the pilot valve port 311).

[0071] Specifically, the buffer ring 350 is in a tapered cylindrical shape as a whole.

[0072] 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.

[0073] The present application also provides a method for assembling a solenoid valve, the method comprising the following steps:

[0074] The second elastic member 800 is disposed between the first iron core 400 and the second iron core 500;

[0075] The valve stem 220 is sequentially inserted into the first cavity 410 and the second cavity 510 from one end of the first cavity 410 away from the second iron core 500, and the end of the valve stem 220 disposed in the first cavity 410 is limitedly matched with the first cavity 410, so that the valve stem 220 cannot be separated from the lower part of the first iron core 400;

[0076] The sealing portion 210 is installed 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 pass through the second cavity 510 and separate from the second iron core 500 .

[0077] Furthermore, the assembly method of the solenoid valve also includes the following steps:

[0078] Install the piston assembly 300 into the inner cavity of the main body 120;

[0079] Connect the valve sleeve 110 to the valve cover 130;

[0080] Placing the first elastic member 700 in the first cavity 410;

[0081] Insert one end of the push rod 600 into the first cavity 410, so that the two ends of the first elastic member 700 are respectively in contact with the valve stem 220 and the push rod 600; and make one end of the push rod 600 limitedly cooperate with the first iron core 400, and one end of the push rod 600 cannot be separated from the upper part of the first iron core 400;

[0082] Put the second elastic member 800, the first iron core 400, the second iron core 500, the sealing part 210, the valve stem part 220, the first elastic member, and the push rod 600 into the valve sleeve 110 as a whole, so that the other end of the push rod 600 abuts against the valve sleeve 110;

[0083] The valve cover 130 is connected to the body portion 120 .

[0084] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0085] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A solenoid valve, characterized in that: The solenoid valve comprises a valve body assembly (100), wherein the valve body assembly (100) is provided with a valve cavity (140) and a main valve port (121) capable of communicating with the valve cavity (140); the solenoid valve further comprises a first iron core (400), a second iron core (500), a valve core assembly (200) and a piston assembly (300) 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 to open or close the main valve port (121); and a pilot valve port (311) is provided at one end of the piston assembly (300) away from the main valve port (121); The valve core assembly (200) includes a sealing portion (210) and a valve stem portion (220), and the valve core assembly (200) is movably sealed with the pilot valve port (311) through the sealing portion (210), one end of the valve stem portion (220) is movably inserted into the first cavity (410) and can be stopped in the first cavity (410), and the other end of the valve stem portion (220) passes through the second cavity (510) and is connected to the sealing portion (210), and the sealing portion (210) can be stopped outside the second cavity (510).

2. The solenoid valve according to claim 1, characterized in that: It also includes a coil (900), and the first iron core (400) and the second iron core (500) can be movably arranged in the valve cavity (140); the height of the first iron core (400) protruding from the coil (900) is constantly greater than or equal to zero.

3. The solenoid valve according to claim 1, characterized in that: 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), and the limiting portion (230) is connected to the outer side of 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).

4. The solenoid valve according to claim 1, characterized in that: The sealing portion (210) comprises a connecting head (211) and a sealing head (212); the connecting head (211) is fixedly connected to the valve stem portion (220), and the connecting head (211) can be stopped at an end of the second iron core (500) away from the first iron core (400); the sealing head (212) is installed on the connecting head (211) and movably seals with the pilot valve port (311).

5. The solenoid valve according to claim 1, characterized in that: The piston assembly (300) comprises a plug body (310), a sealing ring (320) and an extension portion (330); the extension portion (330) is fixedly arranged at one end of the plug body (310) close to the main valve port (121); the sealing ring (320) is sleeved on the outer side of the extension portion (330) and is movably sealed with the main valve port (121); A vertical distance p between an end surface of the extension portion (330) away from the pilot valve port (311) and the pilot valve port (311), and a vertical distance q between the main valve port (121) and the pilot valve port (311) satisfy p>q.

6. The solenoid valve according to claim 1, characterized in that: It also includes a push rod (600) and a first elastic member (700), one end of the push rod (600) abuts against the 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 cooperates with the inner wall of the first cavity (410) for guidance, and the other end of the push rod (600) is limited in the first cavity (410); the first elastic member (700) is located in 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).

7. The solenoid valve according to claim 1, characterized in that: The invention also comprises a second elastic member (800); the second iron core (500) is provided with a mounting hole (513) facing the first iron core (400); at least a part of the second elastic member (800) is located in the mounting hole (513); the first iron core (400) is provided with a protrusion (420); one end of the second elastic member (800) abuts against the second iron core (500), and the other end abuts against the protrusion (420); When the solenoid valve is in a closed state, at least a portion of the protrusion (420) is located in the mounting hole (513).

8. The solenoid valve according to claim 7, characterized in that: 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 greater 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), and one end of the second elastic member (800) abuts against the first limiting step (514).

9. The solenoid valve according to claim 7, characterized in that: The mounting hole (513) comprises a first hole section and a second hole section (515); the first hole section is connected to the second cavity (510); the second hole section (515) is an expanded hole, and the second hole section (515) is arranged at one end of the mounting hole (513) close to the first iron core (400); 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 protrusion (420) is movably matched with the second hole section (515), and when the coil (900) of the solenoid valve is powered off, at least part of the protrusion (420) is located in the second hole section (515).

10. The solenoid valve according to claim 1, characterized in that: The valve body assembly (100) comprises a valve sleeve (110), a main body (120) and a valve cover (130), wherein the valve sleeve (110) is connected to the main body (120) via the valve cover (130); The valve sleeve (110) comprises 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); the valve sleeve (110) is provided with an inclined section matching the reducing section (112); and the distance between the reducing section (112) and the inclined section is greater than or equal to zero.

11. A method for assembling a solenoid valve, characterized in that: For installing the solenoid valve according to any one of claims 1 to 10, the assembly method comprises the following steps: The second elastic member (800) is arranged between the first iron core (400) and the second iron core (500); The end of the valve stem (220) away from the second iron core (500) from the first cavity (410) is sequentially inserted into the first cavity (410) and the second cavity (510), and the end of the valve stem (220) disposed in the first cavity (410) is limitedly matched with the first cavity (410) so that the valve stem (220) cannot be separated from the lower part of the first iron core (400); A sealing portion (210) is installed at one end of the valve stem portion (220) that passes through the second cavity (510), and the sealing portion (210) is stopped outside the second cavity (510) so that the sealing portion (210) cannot pass through the second cavity (510) and separate from the second iron core (500).

12. The method for assembling a solenoid valve according to claim 11, characterized in that: The valve body assembly (100) comprises a valve sleeve (110), a main body (120) and a valve cover (130); The solenoid valve further comprises a push rod (600) and a first elastic member (700). Installing the piston assembly (300) into the inner cavity of the main body (120); Connecting the valve sleeve (110) to the valve cover (130); placing the first elastic member (700) in the first cavity (410); Insert one end of the push rod (600) into the first cavity (410), so that the two ends of the first elastic member (700) are respectively in contact with the valve stem (220) and the push rod (600); and, one end of the push rod (600) is limitedly matched with the first iron core (400), so that one end of the push rod (600) cannot be separated from the upper part of the first iron core (400); 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) are integrally placed into the valve sleeve (110), so that the other end of the push rod (600) abuts against the valve sleeve (110); The valve cover (130) is connected to the main body (120).

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