An electromagnetic valve, pilot valve and four-way valve

Abstract

The application discloses an electromagnetic valve, a pilot valve and a four-way valve, and belongs to the technical field of valve bodies. The electromagnetic valve comprises an electromagnetic coil, a through hole is formed in the electromagnetic coil, a valve body is provided with a mounting assembly, the mounting assembly is inserted into the through hole, a fixing piece is located at one end of the electromagnetic coil away from the valve body, the fixing piece comprises a clamping portion and a stop portion, the clamping portion is clamped with the mounting assembly, and the stop portion abuts against the electromagnetic coil. The clamping portion of the fixing piece is clamped with the mounting assembly, the installation and axial limiting of the electromagnetic coil on the valve body are realized, the electromagnetic coil is prevented from being pulled out of the valve body, the clamping mode has high firmness, is less affected by external environments such as vibration, and thus the reliability of the electromagnetic coil and the valve body during use is ensured. The fixing piece used for clamping is independent of the valve body and the electromagnetic coil, the influence of the connection structure and the connection firmness of the fixing piece and the electromagnetic coil does not need to be considered additionally, the design is simplified, processing is facilitated, the cost is reduced, and the strength of each component is ensured.

Description

Technical Field

[0001] This invention relates to the field of valve body technology, specifically to a solenoid valve, a pilot valve, and a four-way valve. Background Technology

[0002] A piston-type four-way valve (or simply four-way valve) mainly consists of a main valve and a pilot valve. The pilot valve has a coil, and its working principle is to change the flow direction of the fluid within the pilot valve by energizing and de-energizing the coil. This, in turn, switches the flow path within the main valve through the connecting pipe between the pilot valve and the main valve, thus switching the refrigeration system between cooling and heating modes. Generally, the pilot valve uses a household-type solenoid four-way directional valve, and the solenoid coil is also a household-type coil. Figure 1 As shown, the household type coil includes a coil component 11a and a magnetic conductor 12a housed in the coil component 11a. In order to realize the installation of the electromagnetic coil on the pilot valve, the pilot valve is provided with a sleeve 2a for inserting the electromagnetic coil. The sleeve 2a is provided with a stationary iron core, and the stationary iron core is provided with a threaded hole 21a. The coil is provided with a through hole 13a at a position corresponding to the threaded hole 21a. After the screw 3a passes through the through hole 13a, it is screwed into the threaded hole 21a for fixation, thereby realizing the installation of the household type coil and the pilot valve.

[0003] Household coils are generally installed and used inside the casing, so the requirements for their waterproof and impurity-proof properties are lower. However, the piston-type four-way valves used in large commercial units do not have a protective outer frame structure, so the requirements for the coil's waterproof and impurity-proof capabilities are higher. Therefore, commercial electromagnetic coils with better protection performance are required. In addition, commercial electromagnetic coils are larger in size, and the screw mounting structure of the aforementioned household coils cannot meet their installation requirements. Summary of the Invention

[0004] The purpose of this invention is to disclose a solenoid valve that at least partially solves the above-mentioned problems.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A solenoid valve, comprising:

[0007] An electromagnetic coil, wherein a through hole is formed on the electromagnetic coil;

[0008] The valve body is provided with a mounting assembly, which is inserted into the through hole;

[0009] A fixing member, located at the end of the electromagnetic coil away from the valve body, includes a snap-fit ​​part and a stop part. The snap-fit ​​part snaps into the mounting assembly, and the stop part abuts against the electromagnetic coil.

[0010] The beneficial effects of adopting this solution are:

[0011] In this solution, the snap-fit ​​part of the fastener is snapped into the mounting component to achieve the installation and axial positioning of the electromagnetic coil on the valve body, preventing the electromagnetic coil from coming off the valve body. The snap-fit ​​method has high firmness and is less affected by external environmental factors such as vibration, thus ensuring the reliability of the electromagnetic coil and valve body during use.

[0012] Meanwhile, by controlling the snap-fit ​​position, the stop part of the snap-fit ​​component abuts against the electromagnetic coil, stably holding the electromagnetic coil between the component and the valve body, preventing the electromagnetic coil from moving axially, and also increasing the difficulty of circumferential rotation of the electromagnetic coil, thus improving its overall stability after installation.

[0013] In this solution, the solenoid valve is assembled by inserting the mounting component into the through hole of the solenoid coil and then snapping on the fastener. The operation is simple. The fastener used for snapping is independent of the valve body and the solenoid coil. There is no need to consider the influence of its connection structure and connection firmness with the solenoid coil. This simplifies the design, facilitates processing, reduces costs, and ensures the strength of each component.

[0014] Both the snap-fit ​​part and the stop part are set on the fixing part. The fixing part is multi-functional, which simplifies the solenoid valve components, saves assembly space, and reduces material costs.

[0015] Preferably, the fixing component further includes a fixing sleeve, with the snap-fit ​​portion disposed within the fixing sleeve. The mounting component is inserted into the fixing sleeve and snaps into the snap-fit ​​portion. The end face of the fixing sleeve near the electromagnetic coil forms the stop portion. The fixing sleeve serves multiple purposes, eliminating the need for a separate stop portion on the fixing component, simplifying the structure, reducing material and processing costs. Furthermore, the end face of the fixing sleeve abuts against the valve body, mutually restraining the fixing sleeve and the valve body and preventing relative wobbling, further improving the stability of the components after assembly and reducing the possibility of the snap-fit ​​portion detaching from the mounting component. The mounting component is inserted into the fixing sleeve, which protects the insertion end of the mounting component from external damage, extending its service life and reducing replacement costs.

[0016] Preferably, one of the fixing member and the mounting component has a protrusion, and the other has a slot. The protrusion is inserted into the slot to engage the fixing member and the mounting component. The protrusion and the slot have a simple structure and are easy to process. During installation, the fixing member is pressed down to engage the protrusion into the slot, which is convenient to operate. After engagement, the stability is high. It is not easy to come loose under non-large axial external forces, thus ensuring the firmness of the engagement.

[0017] Preferably, a circumferential limiting structure is provided between the electromagnetic coil and the fixing member to restrict the rotation of the fixing member. This restriction further improves the stability of the locking and abutment, and also facilitates the cooperation of the fixing member with other components of the solenoid valve.

[0018] Preferably, the circumferential limiting structure includes a protrusion on one of the electromagnetic coil and the fixing member, and a groove on the other for the protrusion to engage. The groove sidewall stops the protrusion sidewall, thus limiting the rotation of the fixing member relative to the electromagnetic coil. The protrusion and groove structure is simple and easy to manufacture.

[0019] Preferably, the mounting assembly includes a mounting sleeve, a stationary iron core, and a fixing pin. The mounting sleeve is disposed on the valve body, and the stationary iron core is fixed in the mounting sleeve. The stationary iron core is connected to the fixing component via the fixing pin. Commercially available solenoid coils are relatively large, and the commonly used mounting sleeves on the valve body have a fixed length, which is insufficient to penetrate the solenoid coil and engage with the fixing component. Therefore, a fixing pin is attached to the stationary iron core of the mounting sleeve to extend it to a suitable length to achieve the aforementioned engagement and abutment effects. By using the fixing pin to match commonly used mounting sleeves and stationary iron cores, there is no need to redesign, process, or replace existing mounting sleeves and stationary iron cores, saving costs. Furthermore, by changing the fixing pins of different lengths, this mounting structure can be used on different models of mounting sleeves, offering high flexibility and improving the versatility of this mounting structure.

[0020] Preferably, the mounting assembly includes a mounting sleeve and a stationary iron core, the stationary iron core being fixed in the mounting sleeve, the mounting sleeve being snapped into the fixing component, and the mounting sleeve being directly snapped into the fixing component, eliminating the need for an intermediate connecting component, simplifying the components and reducing assembly steps.

[0021] Preferably, the fastener is made of an elastic material so that it deforms during installation, thereby improving the tightness and firmness of the snap-fit ​​and abutment, and ensuring a better installation effect.

[0022] Preferably, the electromagnetic coil includes a coil frame and a housing, the coil frame is embedded in the housing, the housing adopts an integral plastic sealing structure, the through hole penetrates the coil frame and the housing, the electromagnetic valve also includes a fastening cover, the fastening cover covers the outside of the fixing member and is threadedly connected to the fixing member, and the fastening cover is pressed against the housing by screwing the fastening cover to form a seal.

[0023] The outer casing adopts an integral plastic-encapsulated structure, and the plastic-encapsulated structure has elastic properties. When compressed, it will produce elastic deformation. Therefore, when the fastening cover is pressed against the outer casing, a seal will be formed at the through hole, thereby forming a comprehensive seal and protection for the electromagnetic coil. This achieves excellent insulation, waterproofing, dustproofing, and impurity protection, making it suitable for use in large commercial units without an outer casing frame. Furthermore, the fastening cover is screwed onto the fixing component, which not only enables the fastening cover installation but also has a pressing function, further compressing the electromagnetic coil and improving the stability of the electromagnetic coil after installation.

[0024] Preferably, a sealing element is provided between the fastening cover and the outer shell to enhance the sealing effect between the fastening cover and the outer shell.

[0025] Preferably, the fastening cap is made of a flexible non-metallic material to fit with the outer shell, producing a better sealing effect when in contact, while also being insulating.

[0026] Another technical solution adopted by the present invention is as follows:

[0027] A pilot valve includes a pilot valve body, a pilot valve core disposed within the pilot valve body, and a solenoid valve as described in any of the above technical solutions, wherein the solenoid valve drives the pilot valve core to move within the pilot valve body.

[0028] Preferably, the electromagnetic coil has a rectangular cross-section along the radial direction of the mounting assembly, the minimum lateral distance between the axis of the mounting assembly and the pilot valve body is d, and the minimum distance between the centerline of the through hole and the outer periphery of the electromagnetic coil is D. min The maximum distance between the centerline of the through hole and the outer periphery of the electromagnetic coil is D. max The d and D min and D max The following conditions must be met: D min <d<D max .

[0029] By setting D min <d, to leave sufficient space between the mounting assembly and the pilot valve body, ensuring that the solenoid coil can be smoothly installed on the mounting assembly. This is achieved by setting d < D. max This limits the rotation angle of the electromagnetic coil on the mounting assembly.

[0030] Another technical solution adopted by the present invention is as follows:

[0031] A four-way valve includes a main valve and a pilot valve as described in any of the above embodiments. The main valve includes a main valve body and a main valve core disposed within the main valve body. The pilot valve drives the main valve core to move within the main valve body.

[0032] These features and advantages of the invention will be disclosed in detail in the following specific embodiments and accompanying drawings. Attached Figure Description

[0033] The invention will be further described below with reference to the accompanying drawings:

[0034] Figure 1 This is an exploded view of the assembly of an existing household coil and bushing.

[0035] Figure 2 This is a schematic diagram of the structure of the large-capacity piston-type four-way valve in this invention.

[0036] Figure 3 This is a schematic diagram of the pilot valve structure in this invention.

[0037] Figure 4 This is a cross-sectional view of the pilot valve portion in this invention.

[0038] Figure 5 This is a partial exploded view of the solenoid valve in this invention.

[0039] Figure 6 This is a schematic diagram of the three-dimensional structure of the electromagnetic coil of the present invention.

[0040] Figure 7 This is a schematic diagram of the three-dimensional structure of the fixing pin of the present invention.

[0041] Figure 8 This is a three-dimensional structural diagram of the fastener of the present invention.

[0042] Figure 9 This is a cross-sectional view of the fastener of the present invention.

[0043] Figure 10 This is a cross-sectional view of the fastening cover of the present invention.

[0044] Figure label:

[0045] 11a. Coil component; 12a. Magnetic conductor; 2a. Sleeve; 21a. Threaded hole; 13a. Through hole; 3a. Screw;

[0046] 001. Solenoid valve;

[0047] 100. Valve body; 110. Mounting sleeve;

[0048] 200. Electromagnetic coil; 210. Coil frame; 211. Upper end face; 212. Perforation; 220. Outer shell; 221. Top wall; 222. Upper opening; 223. Protrusion;

[0049] 300, fastener; 310, retaining sleeve; 311, protrusion; 320, second external thread; 330, groove;

[0050] 400, retaining pin; 410, threaded end; 411, first external thread; 420, snap-fit ​​end; 421, snap-fit ​​groove; 422, operating groove; 500, fastening cap; 510, annular receiving groove; 520, internal thread;

[0051] 600. Annular sealing ring;

[0052] 700, stationary iron core; 710, threaded hole;

[0053] 002, Pilot valve;

[0054] 003. Large capacity main valve. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0056] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the appendix. Figure 4 The orientations or positional relationships shown are for the purpose of facilitating and simplifying the description of the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0057] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, unless explicitly defined otherwise.

[0058] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0060] In this embodiment, when axial, circumferential, and radial directions are involved, they are all assumed to be along the central axis direction of the mounting sleeve, circumferential, and radial directions, respectively, and will not be described again below.

[0061] The electromagnetic valve 001 of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0062] The present invention will be described below using a large-capacity piston four-way valve composed of a triple four-way valve as an example. However, those skilled in the art will understand that the present invention can also be applied to small-capacity piston four-way valves with solenoid valve 001 as the driving component, piston four-way valves composed of double four-way valves, and other valves.

[0063] Large-capacity piston-type four-way valves are used in heat exchange equipment such as air conditioners to change the flow direction of the medium.

[0064] refer to Figure 2 The large-capacity piston-type four-way valve includes a large-capacity main valve 003 and a pilot valve 002. The large-capacity main valve 003 includes a main valve body and a main valve core located inside the main valve body. Four valve ports are opened circumferentially on the main valve body. The pilot valve 002 drives the main valve core to move within the main valve body to achieve the switching between the valve ports.

[0065] refer to Figures 2 to 4 The aforementioned pilot valve 002 includes a pilot valve body, a solenoid valve 001, and a pilot valve core disposed within the pilot valve body. The solenoid valve 001 drives the pilot valve core to move within the pilot valve body.

[0066] The aforementioned pilot valve 002 and solenoid valve 001 are also preferably four-way valves. The step-by-step driving principle of the multiple four-way valves is existing technology and will not be described in detail here.

[0067] The large-capacity piston-type four-way valve in this invention is mainly used in large commercial units. Therefore, the commercial electromagnetic coil 200 used in its solenoid valve 001 is different from the household electromagnetic coil of the household solenoid valve. It is larger in size and cannot be installed and fixed on the valve body 100 by screws. Moreover, its waterproof and impurity-proof capabilities are more demanding.

[0068] To address the aforementioned technical issues, refer to Figures 2 to 5 According to one embodiment of the present invention, the solenoid valve 001 includes a valve body 100, a solenoid coil 200 and a fixing member 300. A through hole is formed on the solenoid coil 200. A mounting assembly is provided on the valve body 100 and is inserted into the through hole. The fixing member 300 is located at the end of the solenoid coil 200 away from the valve body 100 and includes a snap-fit ​​part and a stop part. The snap-fit ​​part snaps into the mounting assembly and the stop part abuts against the solenoid coil 200.

[0069] In this embodiment, the snap-fit ​​part of the fastener 300 is snapped into the mounting component to realize the installation and axial positioning of the electromagnetic coil 200 on the valve body 100, preventing the electromagnetic coil 200 from coming off the valve body 100. The snap-fit ​​method has high firmness and is less affected by external environment such as vibration, thereby ensuring the reliability of the electromagnetic coil 200 and the valve body 100 during use.

[0070] Meanwhile, by controlling the snap-fit ​​position, the stop part of the snap-fit ​​fastener 300 abuts against the electromagnetic coil 200, stably holding the electromagnetic coil 200 between the fastener 300 and the valve body 100, preventing the electromagnetic coil 200 from moving axially, and also increasing the difficulty of circumferential rotation of the electromagnetic coil 200, thus improving its overall stability after installation.

[0071] In this embodiment, when assembling the solenoid valve 001, the mounting component is inserted into the through hole of the solenoid coil 200, and then the fixing part 300 is snapped on. The operation is simple. The fixing part 300 used for snapping is independent of the valve body 100 and the solenoid coil 200. There is no need to consider the influence of its connection structure and connection firmness with the solenoid coil 200. This simplifies the design, facilitates processing, reduces costs, and ensures the strength of each component.

[0072] Both the snap-fit ​​part and the stop part are set on the fixing part 300. The fixing part 300 is multi-functional, which simplifies the components of the solenoid valve 001, saves assembly space, and reduces material costs.

[0073] Reference Figure 6 The electromagnetic coil 200 includes a coil frame 210 and a housing 220. The coil frame 210 is embedded in the housing 220, and the coil is installed between the coil frame 210 and the housing 220. The housing 220 adopts an integral plastic-encapsulated structure, thereby giving the electromagnetic coil 200 good insulation and protection performance. A through hole penetrates the coil frame 210 and the housing 220. The coil frame 210 includes an upper end face 211 and a lower end face (not shown in the figure due to obstruction). The housing 220 includes a top wall 221 covering the upper end face 211 and a bottom wall covering the lower end face (not shown in the figure due to obstruction).

[0074] The through-hole on the electromagnetic coil 200 includes a perforation 212 extending from its upper end face 211 to its lower end face in the coil frame 210. An upper opening 222 and a lower opening (not shown in the figure due to obstruction) are respectively formed at positions corresponding to the perforation 212 on the top wall 221 and bottom wall of the housing 220. To avoid affecting the insertion of the mounting components, the size of the lower opening is not smaller than the size of the perforation 212, and the size of the upper opening 222 is not smaller than the size of the perforation 212. Preferably, the size of the upper opening 222 is larger than the size of the perforation 212, so as to form a stepped portion between the top wall 221 and the upper end face 211.

[0075] The fastener 300 abuts against the upper end face 211 of the coil frame 210, thereby at least partially housing the fastener 300 in the electromagnetic coil 200. Preferably, the lower part of the fastener 300 is placed in the electromagnetic coil 200, and the upper part is exposed outside the electromagnetic coil 200 for assembly with other components.

[0076] Specifically, refer to Figure 4 , Figure 8 and Figure 9 The fixing member 300 includes a fixing sleeve 310, which preferably has a fixing cap with a top wall. A snap-fit ​​part is disposed in the fixing sleeve 310. The mounting component is inserted into the fixing sleeve 310 and snaps into the snap-fit ​​part. The fixing sleeve 310 is close to the end face of the electromagnetic coil 200, that is, the lower end face of the fixing sleeve 310 forms the aforementioned stop part. During snap-fit, the upper end face 211 of the coil frame 210 stops the lower end face of the fixing sleeve 310. While the fixing sleeve 310 presses the electromagnetic coil 200, the coil frame 210 also limits the pressing stroke of the fixing member 300 to avoid excessive pressing and damage to the snap-fit ​​structure.

[0077] The fixing sleeve 310 is a multi-functional unit, eliminating the need for a separate stop on the fixing component 300, simplifying the structure and reducing material and processing costs. Furthermore, the end face of the fixing sleeve 310 abuts against the valve body 100, mutually restraining the two and preventing relative wobbling. This further improves the stability of the assembled components and reduces the possibility of the snap-fit ​​part detaching from the mounting assembly. Simultaneously, the fixing sleeve 310 has a regular shape and a flat surface, preventing interference with other components and avoiding damage.

[0078] Of course, in other embodiments, a stop portion can also be provided on the fixing member 300, such as a protruding ring on the outer periphery of the fixing sleeve 310, which forms the stop portion. During installation, the fixing sleeve 310 is partially inserted into the through hole. Preferably, the outer wall of the fixing sleeve 310 is in clearance fit with the wall of the through hole, so that the wall of the through hole provides a better radial stop for the fixing member 300, reducing the shaking of the fixing member 300 when subjected to lateral force, further improving the stability of the fixing member 300 after installation, and ensuring the snap-fit ​​and abutment effect.

[0079] To simplify the structure and facilitate processing, such as Figure 4As shown, the preferred snap-fit ​​structure in this embodiment is a protrusion-groove 421 mating structure. Specifically, the inner wall of the fixing sleeve 310 has a protrusion, and the outer wall of the mounting component has a groove 421. During installation, pressing down on the fixing member 300 causes the protrusion to snap into the groove 330, thus snapping the fixing member 300 into the mounting component. This facilitates operation, ensures high stability after snapping, and prevents disengagement under minimal axial external force, guaranteeing a firm snap-fit. The mounting component is inserted into the fixing sleeve 310, which protects the insertion end of the mounting component from external damage, extending its service life and reducing replacement costs. Furthermore, the snap-fit ​​position can be set relatively close to the valve body 100, thereby shortening the length of the mounting component and saving material costs.

[0080] The protrusions are arranged circumferentially along the inner wall of the fixing sleeve 310, preferably continuously extending annular protrusions. For example... Figure 8 and Figure 9 As shown, the protrusion preferably has a pointed tip 311. Compared with an arc-shaped protrusion, the pointed tip 311 is not only easier to snap into and install, but also has a better stopping effect and is less likely to fall out of the slot 421. Preferably, after the pointed tip 311 is snapped into the slot 421, it has an interference fit with the slot wall of the slot 421 to improve the snap-in firmness.

[0081] Of course, dot-shaped or block-shaped protrusions can also be set for multiple intervals.

[0082] In this embodiment, the fastener 300 is preferably made of a non-metallic material with a certain degree of elasticity, such as plastic, so that the protrusion also has a certain degree of elasticity, making it an elastic protrusion. It can be squeezed into the slot 421 and recover its deformation within the slot 421, filling the slot 421 to ensure the firmness of the engagement and forming a seal between the fastener 300 and the mounting assembly. The elastic protrusion also has a buffering effect, reducing wear between components and extending their service life. Simultaneously, the elasticity of the fastener 300 results in a tighter fit with the mounting assembly, better stability after assembly, and improved compression and contact with the upper end face 211 of the coil frame 210, forming a seal at the contact point. Furthermore, since the fastener 300 is in direct contact with the coil frame 210 and the mounting assembly, the non-metallic material also provides insulation, improving safety during use.

[0083] Preferably, the protruding slot 421 mating structure can be placed in the through hole to further shorten the length of the mounting component.

[0084] Of course, in other embodiments, a groove 330 may be provided on the inner wall of the fixing sleeve 310, and a protrusion may be provided on the outer wall of the mounting component.

[0085] Of course, in other embodiments, other snap-fit ​​structures may also be used, such as a snap-fit ​​groove 421 provided axially between the lower end of the fixing sleeve 310 and the upper end of the mounting component.

[0086] To limit the rotation of the fixing member 300 relative to the electromagnetic coil 200, a circumferential limiting structure is provided between the electromagnetic coil 200 and the fixing member 300. Specifically, as shown in the figure... Figure 5 and Figure 6 As shown, a protrusion 223 is provided at the step portion, that is, the protrusion 223 extends inward from the inner periphery of the upper opening 222 of the outer shell 220.

[0087] The fixing member 300 is provided with a groove 330 that matches the protrusion 223. The groove 330 is opened inward from the side wall of the fixing member 300. The protrusion 223 is inserted into the groove 330 to form a circumferential limiting structure. The side wall of the groove 330 stops the side wall of the protrusion 223 to limit the rotation of the fixing member 300 relative to the electromagnetic coil 200. The structure of the protrusion 223 and the groove 330 is simple and easy to process.

[0088] At least one protrusion 223 is provided at the step portion, preferably two or more, and the two or more protrusions 223 are evenly distributed circumferentially on the step portion.

[0089] The circumferential limiting structure further improves the stability of the snap-fit ​​and abutment, and at the same time, it facilitates the cooperation between the fixing part 300 and other components on the solenoid valve 001.

[0090] In this embodiment, the protrusion 223 is formed by extending radially inward from the inner wall of the upper opening 222 of the top wall 221 of the outer shell 220, and the protrusion 223 is integrally formed with the inner wall of the upper opening 222.

[0091] Of course, in other embodiments, the bump 223 may also be formed by extending upward from the upper end face 211 of the coil frame 210.

[0092] Of course, in other embodiments, other circumferential limiting structures, such as D-type surface mating structures, can also be used.

[0093] The existing valve body 100 has a fixed-length mounting sleeve 110, which is insufficient to pass through the solenoid coil 200 and engage with the fixing component 300. To save on improvement costs, such as Figure 4 and Figure 5 As shown, the installation components in this embodiment include an installation sleeve 110, a stationary iron core 70, and a fixing pin 400. The installation sleeve 110 is disposed on the valve body 100, the stationary iron core 700 is fixed in the installation sleeve 110, the fixing pin 400 is connected to the side of the installation sleeve 110 away from the valve body 100, and the fixing member 300 is connected to the end of the fixing pin 400 away from the installation sleeve 110.

[0094] By attaching a fixing pin 400 to the stationary iron core 700, the mounting sleeve 110 is extended to a suitable length to cooperate with the fixing component 300, achieving the aforementioned snap-fit ​​and abutment effects. The fixing pin 400 can be matched with commonly used mounting sleeves 110 and stationary iron cores 700, eliminating the need to redesign, process, and replace existing mounting sleeves 110 and stationary iron cores 700, thus saving costs. Furthermore, by replacing the fixing pins 400 with different lengths, this mounting structure can be used on different models of mounting sleeves 110, offering high flexibility and improving the versatility of this mounting structure.

[0095] like Figure 4 and Figure 7 As shown, the fixing pin 400 specifically includes a threaded end 410 that is threaded to the stationary iron core 700 and a snap-fit ​​end 420 that snaps into the fixing member 300. That is, the end of the fixing pin 400 closer to the mounting sleeve unit is the threaded end 410, and the end of the fixing pin 400 further away from the mounting sleeve unit is the snap-fit ​​end 420.

[0096] The commonly used stationary iron core 700 in the market has a threaded hole 710 at the end away from the valve body 100, which mates with a screw. In this embodiment, the threaded end 410 is provided with a first external thread 411 that mates with the threaded hole 710. Thus, the threaded end 410 of the fixing pin 400 can be used well with the existing mounting sleeve 110 without the need for special modification of the stationary iron core 700, making it more adaptable to the market. In this embodiment, the snap-fit ​​structure used to install the electromagnetic coil onto the valve body has a snap-fit ​​end 420 on the fixing pin 400 and a snap-fit ​​part on the fixing member 300. When the snap-fit ​​structure is damaged, only the fixing pin 400 or the fixing member 300 needs to be replaced. This does not affect the electromagnetic coil 200, valve body 100, mounting sleeve 110, or the stationary iron core welded into the mounting sleeve 100, reducing the difficulty and cost of replacement.

[0097] The stationary iron core 700 in the mounting sleeve 110 is made of soft magnetic stainless steel. To avoid affecting the magnetic force of the stationary iron core 700, the fixing pin 400 is also a magnetic fixing pin, preferably made of soft magnetic stainless steel. When the solenoid valve 001 is energized, the mounting assembly generates sufficient magnetic force to attract the moving iron core, thereby realizing the opening and closing of the solenoid valve 001. The fixing pin is made of soft magnetic stainless steel, which also ensures both the connection strength when used as a connector and the high magnetic permeability when used as an iron core.

[0098] Preferably, in order to improve the versatility of the fixing pin 400 and make it better match the mounting sleeves 110 of different lengths or form mounting assemblies of different lengths, the fixing pin 400 can be designed as a telescopic fixing pin 400 with adjustable length.

[0099] Preferably, in order to facilitate the installation of the fixing pin 400 on the stationary iron core 700, an operating groove 422 is provided at the end of the fixing pin 400 away from the stationary iron core 700, so that the worker can use a screwdriver to insert into the operating groove 422 to screw the threaded end 410 of the fixing pin 400 into the threaded hole 710 of the stationary iron core 700.

[0100] Of course, in other embodiments, the length of the mounting sleeve 110 can be increased, and a snap-fit ​​end that snaps into the fastener 300 can be formed on the mounting sleeve 110 as a mounting component, eliminating the need for an intermediate connecting component, simplifying the components and reducing assembly steps.

[0101] In order to form a comprehensive seal and protection for the electromagnetic coil 200, such as Figure 2 , Figure 4 and Figure 5 As shown, the solenoid valve 001 also includes a fastening cover 500, which covers the outside of the fixing member 300 and is threadedly connected to the fixing member 300. By screwing the fastening cover 500, the fastening cover 500 presses against the outer shell 220 to form a seal.

[0102] Specifically, such as Figure 10 As shown, the inner circumference of the fastening cover 500 is provided with an internal thread 520, and the outer circumference of the fixing sleeve 310 of the fixing member 300 is provided with a second external thread 320 that mates with the internal thread 520.

[0103] At this time, the lower end face of the second external thread 320 forms a radially outwardly extending convex ring on the outer periphery of the fixing sleeve 310, which is the stop part separately provided on the fixing member 300 mentioned above. The second external thread 320 has multiple functions in one piece, eliminating the need to provide a separate convex ring on the fixing member 300, further simplifying the structure of the fixing member 300, optimizing the structure, simplifying the processing technology, saving costs, and improving efficiency.

[0104] A circumferential limiting structure is provided between the electromagnetic coil 200 and the fixing member 300 to prevent the fixing member 300 from rotating on the electromagnetic coil 200. This is also to achieve the screw engagement of the fastening cover 500 with the fixing member 300, so as to prevent the fixing member 300 from rotating with the fastening cover 500 when the fastening cover 500 is screwed.

[0105] Preferably, the radial dimension of the fastening cover 500 is larger than the size of the upper opening 222 of the outer shell 220, that is, the fastening cover 500 covers the upper opening 222. The outer shell 220 is a plastic-sealed structure with good deformation performance. When the fastening cover 500 is pressed down and abuts against the outer shell 220, a seal is formed at the edge of the through hole, which provides a good waterproof, dustproof and impurity-proof effect for the coil frame 210 built into the outer shell 220 and the coil wound on the coil frame 210. This is suitable for use in large commercial units without the outer shell 220 frame. In addition, the fastening cover 500 is screwed on the fixing member 300, so that while the fastening cover 500 is installed, it also has a pressing function, further squeezing the electromagnetic coil 200 and improving the stability of the electromagnetic coil 200 after installation.

[0106] The fastening cover 500 is preferably made of a flexible non-metallic material, such as plastic, to further enhance the sealing effect with the outer shell 220, while also providing insulation.

[0107] At the same time, such as Figure 4 and Figure 5 As shown, a sealing element can also be provided between the fastening cover 500 and the outer shell 220. The sealing element is preferably an annular sealing ring 600. An annular receiving groove 510 for accommodating the annular sealing ring 600 is opened at the bottom end of the fastening cover 500. The annular sealing ring 600 is partially placed in the annular receiving groove 510. The fastening cover 500 is screwed to compress the annular sealing ring 600, causing it to deform under pressure and form a seal, which further enhances the sealing effect on the through hole.

[0108] Of course, in other embodiments, the seal may also be a gasket sandwiched between the fastening cover 500 and the housing 220.

[0109] The installation process of the electromagnetic coil 200 and the valve body 100 is as follows:

[0110] First, mate the threaded end 410 of the fixing pin 400 with the threaded hole 710 of the stationary iron core 700, and tighten it to form an installation assembly. Then, after the electromagnetic coil 200 is fitted onto the installation assembly, the fixing member 300 is installed, so that the lower end of the fixing sleeve 310 of the fixing member 300 is inserted into the through hole 212 of the coil frame 210. The snap-fit ​​ends of the fixing member 300 and the fixing pin 400 snap together. At the same time, the groove 330 on the fixing member 300 and the protrusion 233 on the electromagnetic coil 200 cooperate to fix it. The lower end face of the second external thread 320 of the fixing member 300 abuts against the upper end face 211 of the coil frame 210 of the electromagnetic coil 200 to fix the electromagnetic coil 200. Finally, the fastening cap 500 with the annular sealing ring 600 is screwed into the second external thread 320 of the fixing member 300 to seal the electromagnetic coil 200.

[0111] In this embodiment, the solenoid valve 001 is mounted on the pilot valve 002, serving as the driving component of the pilot valve 002. Preferably, as follows: Figure 3As shown, the mounting sleeve 110 is arranged parallel to the pilot valve body 100. The electromagnetic coil 200 has a rectangular cross-section along the radial direction of the mounting assembly, that is, the radial cross-section of the outer casing 220 is rectangular. The minimum lateral distance between the axis of the mounting assembly and the pilot valve body 100 is d. Figure 6 As shown, the minimum distance between the center line of the through hole and the outer periphery of the outer casing 220 is D. min The maximum distance between the centerline of the through hole and the outer perimeter of the outer casing 220 is D. max ,d、D min and D max The following conditions must be met: D min <d<D max .

[0112] By setting D min <d, to leave sufficient space between the mounting assembly and the pilot valve body 100, ensuring that the solenoid coil 200 can be smoothly mounted on the mounting assembly. This is achieved by setting d < D. max This limits the rotation angle of the electromagnetic coil 200 on the mounting assembly.

[0113] The above description is merely a specific embodiment of the invention, but the scope of protection of the invention is not limited thereto. Those skilled in the art should understand that the invention includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of the invention will be included within the scope of the claims.

Claims

1. A pilot valve, comprising a pilot valve body, a pilot valve core disposed within the pilot valve body, and a solenoid valve, wherein the solenoid valve drives the pilot valve core to move within the pilot valve body, characterized in that, The solenoid valve includes: An electromagnetic coil (200) having a through hole formed thereon; The valve body (100) is provided with a mounting assembly, which is inserted into the through hole; A fixing member (300) is located at the end of the electromagnetic coil (200) away from the valve body (100), and includes a snap-fit ​​part and a stop part. The snap-fit ​​part snaps into the mounting assembly, and the stop part abuts against the electromagnetic coil (200). The fixing member (300) includes a fixing sleeve (310), the snap-fit ​​part is disposed in the fixing sleeve (310), the mounting assembly is inserted into the fixing sleeve (310) and snaps into the snap-fit ​​part, and the end face of the fixing sleeve (310) near the electromagnetic coil (200) forms the stop part. The lower end face of the outer periphery of the fixing sleeve (310) forms a convex ring extending radially outward, which is the stop part; one of the fixing member (300) and the mounting component is provided with a protrusion, and the other is provided with a slot (421). The protrusion is inserted into the slot (421) to make the fixing member (300) and the mounting component engage. The protrusion is a pointed tip (311) with a sharp point. After the pointed tip (311) is inserted into the slot (421), it is interference-fitted with the groove wall of the slot (421). The electromagnetic coil (200) has a rectangular cross-section along the radial direction of the mounting assembly. The minimum lateral distance between the axis of the mounting assembly and the valve body of the pilot valve is d. The minimum distance between the centerline of the through hole and the outer periphery of the electromagnetic coil (200) is D. min The maximum distance between the centerline of the through hole and the outer periphery of the electromagnetic coil (200) is D. max The d and D min and D max The following conditions must be met: D min <d<D max .

2. The pilot valve according to claim 1, characterized in that, A circumferential limiting structure is provided between the electromagnetic coil (200) and the fixing member (300) to restrict the rotation of the fixing member (300).

3. The pilot valve according to claim 2, characterized in that, The circumferential limiting structure includes a protrusion (223) provided on one of the electromagnetic coil (200) and the fixing member (300), and the other is provided with a groove (330) for the protrusion (223) to be engaged.

4. The pilot valve according to any one of claims 1 to 3, characterized in that, The mounting assembly includes a mounting sleeve (110), a stationary iron core (700), and a fixing pin (400). The mounting sleeve (110) is disposed on the valve body (100), the stationary iron core (700) is fixed in the mounting sleeve (110), and the stationary iron core (700) is connected to the fixing member (300) through the fixing pin (400).

5. The pilot valve according to any one of claims 1 to 3, characterized in that, The mounting assembly includes a mounting sleeve (110) and a stationary iron core (700), the stationary iron core (700) being fixed in the mounting sleeve (110), and the mounting sleeve (110) being snapped into the fastener (300).

6. The pilot valve according to any one of claims 1 to 3, characterized in that, The fastener (300) is made of an elastic material.

7. The pilot valve according to any one of claims 1 to 3, characterized in that, The electromagnetic coil (200) includes a coil frame (210) and a housing (220). The coil frame (210) is embedded in the housing (220). The housing (220) adopts an integral plastic sealing structure. The through hole passes through the coil frame (210) and the housing (220). The electromagnetic valve (001) also includes a fastening cover (500). The fastening cover (500) covers the fixing member (300) and is threadedly connected to the fixing member (300). By screwing the fastening cover (500), the fastening cover (500) presses the housing (220) together to form a seal.

8. The pilot valve according to claim 7, characterized in that, A seal is provided between the fastening cover (500) and the outer shell (220).

9. The pilot valve according to claim 8, characterized in that, The fastening cap (500) is made of a flexible non-metallic material.

10. A four-way valve, characterized in that, The system includes a main valve and a pilot valve (002) according to any one of claims 1 to 9. The main valve includes a main valve body and a main valve core disposed within the main valve body. The pilot valve (002) drives the main valve core to move within the main valve body.

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