Electromagnetic valve

Abstract

The utility model discloses an electromagnetic valve which comprises a main valve component, a pilot valve component and a piston component, the electromagnetic valve comprises a main valve cavity, the piston component is located in the main valve cavity, the piston component comprises a piston, the piston comprises a base body part and a protruding part, the base body part is located in the main valve component, and the protruding part is located in the main valve component. The base body part is in sliding fit with the main valve part, the pilot valve part comprises a valve cover, the valve cover is provided with a hole part, the protruding part is in sliding fit with the hole part, and at least one of the protruding part and the hole part comprises a first flow guide channel; when the electromagnetic valve is in a valve closing state, the main valve cavity comprises a first cavity body, a second cavity body and a third cavity body. According to the electromagnetic valve provided by the invention, the first flow guide channel guides the flow of the medium, so that the piston is easy to move upwards, the piston is ensured to move in place, the response rate of the piston is improved, and the valve opening performance of the electromagnetic valve is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves for refrigeration systems with pistons, and particularly to a solenoid valve. Background Art

[0002] In the valve for a refrigeration system with a piston, Figure 1 As a schematic cross-sectional view of the solenoid valve in the background art, the solenoid valve includes a main valve component, a pilot valve component 2', and a piston 1'. The piston 1' can slide within the main valve component and the pilot valve component 2', and when the pressure above and below the piston 1' changes, the piston 1' abuts against or moves away from the main valve port of the main valve component, thereby realizing the opening and closing functions of the solenoid valve.

[0003] For the structure of the above solenoid valve, whether the piston 1' slides in place affects the opening ability of the solenoid valve. Therefore, how to further improve the opening performance of the solenoid valve has become an issue of concern to those skilled in the art. Summary of the Utility Model

[0004] A solenoid valve provided by the utility model includes a main valve component, a pilot valve component, and a piston component. The solenoid valve includes a main valve cavity, the piston component is located in the main valve cavity, the piston component includes a piston, the piston includes a base portion and a protruding portion, the base portion is located within the main valve component, the base portion is slidably matched with the main valve component, the pilot valve component includes a valve cover, the valve cover has a hole portion, the protruding portion is slidably matched with the hole portion, and at least one of the protruding portion and the hole portion includes a first flow guiding channel; in the closed valve state of the solenoid valve, the main valve cavity includes a first cavity, a second cavity, and a third cavity. The portion between the base portion and the valve cover serves as the first cavity, the pilot valve component further includes an armature component, and the portion between the armature component and the protruding portion serves as the second cavity. The first flow guiding channel communicates the first cavity and the second cavity; the base portion includes a second flow guiding channel, the main valve component includes a bottom end portion, and the portion between the base portion and the bottom end portion serves as the third cavity. The second flow guiding channel communicates the second cavity and the third cavity.

[0005] For the solenoid valve provided in this application, since a part of the protruding portion of the piston is located in the hole portion of the valve cover, at least one of the protruding portion and the hole portion includes a first flow guiding channel, and the base portion includes a second flow guiding channel. In the closed valve state of the solenoid valve, the first cavity, the second cavity, and the third cavity are interconnected. The first flow guiding channel guides the medium, making it easy for the piston to move upward and ensuring that the piston moves in place, improving the response rate of the piston, and thus enhancing the opening performance of the solenoid valve. Description of the Drawings

[0006] Figure 1: Schematic cross-sectional view of the solenoid valve in the background art;

[0007] Figure 2 : Schematic cross-sectional view of a solenoid valve provided by the present utility model in the valve-closed state;

[0008] Figure 3 : Figure 2 Schematic cross-sectional view of the solenoid valve in the valve-open state in

[0009] Figure 4 : Figure 2 Schematic cross-sectional view of the cooperation between the sleeve and the valve cover in

[0010] Figure 5 : Figure 2 Schematic cross-sectional view of the piston in

[0011] Figure 6 : Schematic structural view of another valve cover in the solenoid valve provided by the present utility model;

[0012] Figure 7 : Figure 6 Schematic cross-sectional view of the cooperation between the sleeve and the valve cover in

[0013] Figure 8 : Schematic cross-sectional view of still another valve cover in the solenoid valve provided by the present utility model;

[0014] Figure 9 : Figure 8 Schematic cross-sectional view of the valve cover in

[0015] Figure 10 : Schematic cross-sectional view of yet another valve cover in the solenoid valve provided by the present utility model. Detailed implementation manners

[0016] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the present utility model will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. The upper, lower and other orientation terms involved herein are defined according to the positions of the components shown in Figure 2 in order to clarify and facilitate the expression of the technical solution. It should be understood that the orientation terms adopted herein should not limit the scope of protection claimed in this application.

[0017] Figure 2 is a schematic cross-sectional view of a solenoid valve provided by the present utility model in the valve-closed state; Figure 3 is Figure 2 a schematic cross-sectional view of the solenoid valve in the valve-open state in Figure 4 isFigure 2 Schematic sectional view of the mating of the middle casing and the valve cover; Figure 5 For Figure 2 Schematic sectional view of the middle piston.

[0018] In this embodiment, it is defined that Figure 2 The axial direction of the hole portion 220 and the axial direction of the pilot valve sleeve 21 shown are the longitudinal direction of the solenoid valve.

[0019] As shown in the figure, the solenoid valve of this embodiment can be installed in the refrigeration system to play the role of on-off. It includes a main valve component 1, a pilot valve component 2 and a piston component 3. The main valve component 1 includes a main valve body 11. The main valve body 11 includes an inlet end 113 and an outlet end 114. The first connecting pipe is welded and fixed to the inlet end 113, and the second connecting pipe is welded and fixed to the outlet end 114. The valve cavity of the solenoid valve includes a main valve cavity 111. The piston component 3 is located in the main valve cavity 111. The main valve body 11 includes a main valve port portion 112. In the open valve state of the solenoid valve, the first connecting pipe can communicate with the main valve cavity 111 through the main valve port portion 112, and the second connecting pipe communicates with the main valve cavity 111.

[0020] The pilot valve component 2 includes a pilot valve sleeve 21 and an armature component. The armature component includes a moving iron core 24, a stationary iron core 25, a pilot valve core 26, a first spring 27, a second spring 28, and an annular block 29. The stationary iron core 25 is fixed in the inner cavity 211 of the valve sleeve 21. The moving iron core 24 can slide axially along the pilot valve sleeve 21 in the inner cavity 211. The moving iron core 24 has a first inner hole 241 on the side close to the stationary iron core 25. At least part of the first spring 27 is located in the first inner hole 241. One end of the first spring 27 abuts against the moving iron core 24, and the other end of the first spring 27 abuts against the stationary iron core 25; the pilot valve core 26 is partially located in the second inner hole 242 of the moving iron core 24. The second inner hole 242 communicates with the first inner hole 241. The annular block 29 is limited to the bottom of the second inner hole 242. One end of the second spring 28 abuts against the boss portion of the pilot valve core 26, and the other end of the second spring 28 abuts against the upper surface of the annular block 29. The pilot valve core 26 has an extending section 261, and the extending section 261 passes through the annular block 29 and extends out of the second inner hole 242.

[0021] In this embodiment, the piston component 3 includes a piston 31. The piston 31 includes a base portion 311 and a protruding portion 312. The base portion 311 is located in the main valve cavity 111 and is in sliding fit with the cavity wall of the main valve cavity 111. The pilot valve component 2 includes a valve cover 22. The valve cover 22 is located above the base portion 311. The valve cover 22 has a hole portion 220. The protruding portion 312 is in sliding fit with the hole portion 220. At least one of the protruding portion 312 and the hole portion 220 includes a first flow guiding channel 224; in the closed valve state of the solenoid valve ( Figure 2In the state shown, the main valve chamber 111 includes a first chamber a, a second chamber b, and a third chamber c. The part between the base portion 311 and the valve cover 22 serves as the first chamber a, the part between the armature component and the protruding portion 312 serves as the second chamber b, and the first diversion channel 224 connects the first chamber a and the second chamber b. The base portion 311 includes a second diversion channel 3114, and the second diversion channel 3114 serves as a balance hole. The main valve body 11 includes a bottom end portion 1111 on the side away from the armature component, and the part between the base portion 311 and the bottom end portion 1111 serves as the third chamber c. The second diversion channel 3114 connects the second chamber b and the third chamber c. In the solenoid valve's valve-closed state, the first chamber a, the second chamber b, and the third chamber c are interconnected. The medium acts on the piston 31 through the first diversion channel 224. When the piston 31 slides, it makes it easier for the piston 31 to move upward, improves the response rate of the piston 31, and ensures that the piston 31 can slide in place, thereby improving the valve-opening performance of the solenoid valve.

[0022] In this embodiment, when the solenoid valve is in the valve-closed state, the inlet end 113 of the solenoid valve is a high-pressure medium area. The high-pressure medium passes through the second diversion channel 3114 and reaches the first chamber a and the second chamber b. Since the sum of the medium pressure borne by the upper part of the piston 31 and the pressure exerted by the first spring 27 is greater than the medium pressure borne by the lower part of the piston 31, the piston 31 is kept in contact with the main valve orifice 112, that is, the main valve orifice 112 is closed, and the flow path between the inlet end 113 and the outlet end 114 of the solenoid valve is disconnected. The piston 31 further includes a receiving cavity 34. The side of the receiving cavity 34 away from the base portion 311 is open. The piston 31 includes a pilot valve seat 33. The pilot valve seat 33 is located at the bottom of the receiving cavity 34. The pilot valve seat 33 includes a pilot valve orifice 331. The high-pressure medium in the cavity above the piston 31 flows through the pilot valve orifice 331 towards the main valve orifice 112 and then flows towards the outlet end 114. At this time, the sum of the medium pressure borne by the upper cavity of the piston 31 and the pressure exerted by the first spring 27 is less than the medium pressure borne by the lower cavity of the piston 31. Under the action of the pressure difference, the piston 31 moves upward to open the main valve orifice 112, so that the inlet end 113 and the outlet end 114 are connected through the main valve orifice 112.

[0023] It should be noted that the protruding portion 312 and the hole portion 220 are in clearance fit. Although the protruding portion 312 can slide in the hole portion 220 through the clearance fit, due to the limited fit clearance between the protruding portion 312 and the hole portion 220, the sliding speed of the protruding portion 312 will still be affected when the valve is opened. The first diversion channel 224 diverts the medium when the protruding portion 312 slides, making it easier for the piston 31 to move upward, improving the response speed of the piston 31, and thus improving the valve-opening action performance of the solenoid valve.

[0024] In this embodiment, the first diversion channel 224 includes a first upper port portion 2242. The side of the protruding portion 312 away from the base portion 311 has a first end face 3121. In the open valve state of the solenoid valve, the height of the position where the first upper port portion 2242 is located is greater than or equal to the height of the position where the first end face 3121 is located. During the movement of the piston 31, the first diversion channel 224 can always ensure that the flow rate of the medium does not suddenly decrease, and the flow rate of the medium is always higher than the case where the outer surface of the protruding portion 312 and the inner wall of the hole portion 220 are in clearance fit. Therefore, the movement rate of the protruding portion 312 can be ensured, and the action performance of the piston 31 can be guaranteed.

[0025] In this embodiment, the hole portion 220 includes a flared portion 223. The small-diameter end of the flared portion 223 is connected to the hole portion 220. The side of the valve cover 22 close to the base portion 311 has a second end face 2212. The large-diameter end of the flared portion 223 is connected to the second end face 2212. In this embodiment, the first diversion channel 224 includes a second lower port portion 2241, and the second lower port portion 2241 is located in the flared portion 223. By means of this flared portion 223, the rate at which the medium enters the first diversion channel 224 through the second lower port portion 2241 is further increased, thereby improving the response speed of the piston 31 when the solenoid valve is opened.

[0026] In this embodiment, the inner wall of the hole portion 220 has a groove portion 224a, and the groove portion 224a serves as the above-mentioned first diversion channel 224. The groove portion 224a extends along the axial direction of the hole portion 220 from the second end face 2212. The groove portion 224a includes a first diversion groove 224a1 and a second diversion groove 224a2. The number of the first diversion groove 224a1 and the second diversion groove 224a2 is the same, and the number is at least one. The first diversion groove 224a1 and the second diversion groove 224a2 are symmetrically arranged in the radial direction of the hole portion 220. The groove portion 224a can provide continuous and effective diversion for the medium. The groove portion 224a is a vertical groove, and the opening direction of the groove portion 224a is the same as the moving direction of the protruding portion 312, which can reduce or avoid a certain degree of deflection when the piston 31 moves, and further reduce or avoid the situation that the piston 31 gets stuck or even jammed when the outer surface of the protruding portion 312 abuts against the inner wall of the hole portion 220, ensuring that the piston 31 slides in place, thereby guaranteeing the valve opening performance of the solenoid valve.

[0027] In this embodiment, along the projection direction of the axial direction of the hole portion 220, the contour surface of the groove portion 224a is arc-shaped, and of course, it can also be other shapes such as square. The groove portion 224a can be formed by turning. Its processing method is simple and the production efficiency is high. Of course, the processing method is not limited to this, as long as the groove portion 224a is processed into shape.

[0028] In this embodiment, the valve cover 22 has a flow-through portion 225 and an annular groove 226. Radially of the hole portion 220, the annular groove 226 is located between the hole portion 220 and the outer surface of the valve cover 22. The annular groove 226 is recessed from the second end face 2212 in the direction away from the base portion 311. Thus, by providing the annular groove 226, the manufacturing cost of the valve cover 22 can be reduced. The upper-side port of the second diversion channel 3114 faces the annular groove 226 to ensure that the flow of the medium is unobstructed during the valve-opening process. The flow-through portion 225 is recessed from the second end face 2212 in the direction away from the base portion 311. The flow-through portion 225 includes a first flow-through groove 2251 and a second flow-through groove 2252. The first flow-through groove 2251 communicates the annular groove 226 and the hole portion 220 in the radial direction of the hole portion 220. The second flow-through groove 2252 communicates the outer surface of the valve cover 22 and the annular groove 226 in the radial direction of the hole portion 220. When the piston 31 slides upward, the flow-through portion 225 can increase the flow space of the medium in the first cavity a, accelerate the flow rate of the medium toward the hole portion 220, and improve the valve-opening efficiency. The base portion 311 has a third end face 3113 near the protruding portion 312, so that it can be ensured that the third end face 3113 abuts against the second end face 2212 to reduce or avoid the situation of incomplete valve opening.

[0029] Meanwhile, the valve cover 22 has a limiting portion 22121. The area between the outer surface of the valve cover 22 and the annular groove 226 serves as the limiting portion 22121. The second end face 2212 abuts against the third end face 3113 only through the limiting portion 22121 to ensure that the valve of the solenoid valve is fully opened, and the machining difficulty of the flatness of the entire end face of the second end face 2212 can be reduced.

[0030] In this embodiment, the piston component 3 further includes a piston ring component 32. The outer ring surface 3111 of the base portion 311 has a piston groove 3112. The piston ring component 32 is located in the piston groove 3112. The outer peripheral surface of the piston ring component 32 abuts against the inner ring wall of the main valve body 11. The number of the piston grooves 3112 is one, and the number of the piston ring components 32 corresponds to that of the piston grooves 3112. When the piston 31 slides axially along the hole portion 220, the piston ring component 32 reduces the friction and wear between the base portion 311 and the inner ring wall of the main valve body 11 during the sliding of the base portion 311.

[0031] Meanwhile, the outer ring surface 3111 of the base portion 311 further has a first outer segment 31111 and a second outer segment 31112. In the axial direction of the hole portion 220, the piston groove 3112 is located between the first outer segment 31111 and the second outer segment 31112. The outer diameter of the second outer segment 31112 is smaller than that of the first outer segment 31111. The piston ring component 32 has a tail segment 321, and the tail segment 321 extends from the side of the piston ring component 32 away from the core iron component. The tail segment 321 is located outside the second outer segment 31112. The piston ring component 32 can scrape off the impurities attached to the inner ring wall of the main valve body 11 through the tail segment 321, ensuring smooth sliding of the piston component 3.

[0032] Based on this, during the sliding process of the piston 31, the piston ring component 32 provides guidance for the base portion 311, and the first diversion channel 224 provides guidance for the protruding portion 312. When only the piston ring component 32 guides the base portion 311, the gap between the piston ring component 32 and the inner ring wall of the main valve body 11 is uneven, and the piston 31 will be deflected to a certain extent, so that the pilot valve core 26 cannot effectively align with the pilot valve port 33 (it can be understood that when the solenoid valve is in the closed valve state, if the pilot valve core 26 cannot effectively align with the pilot valve port 33, the pilot valve core 26 cannot effectively close the pilot valve port 331, and during the long-term operation of the solenoid valve, the pilot valve port 331 will expand the flow area of the pilot valve port 331 due to adapting to the collision of the pilot valve core 26, affecting the sealing performance of the pilot valve port 331 in the closed valve state of the solenoid valve). When the piston 31 slides, the medium acts on the protruding portion 312 through the first diversion channel 224, which can reduce the deviation of the piston 31 during sliding and effectively straighten the piston 31, so that the pilot valve core 26 can effectively align with the pilot valve port 331, reducing or avoiding the situation where the pilot valve core 26 deviates from the pilot valve port 331, and further reducing or avoiding internal leakage of the solenoid valve.

[0033] In this embodiment, the valve cover 22 includes a first cylindrical portion 221 and a second cylindrical portion 222. At least a part of the first cylindrical portion 221 is located in the main valve cavity 111. The valve cover 22 further includes a sealing ring. The outer surface of the first cylindrical portion 221 has a mounting groove 2213, and a part of the sealing ring is located in the mounting groove 2213. The sealing ring can be an O-ring. The outer dimension of the second cylindrical portion 222 is larger than the inner dimension of the main valve cavity 111. The outer dimension of the second cylindrical portion 222 is larger than the inner dimension of the main valve cavity 111. The pilot valve component 2 further includes an end cover 23, and the end cover 23 has an end cover cavity 231. The end cover 23 is as follows Figure 1The cross-section is concave from the viewing angle, the inner wall of the end cover cavity 231 is threadedly matched with the outer surface of the main valve body 11, the inner wall of the end cover cavity 231 is provided with an internal thread, the outer surface of the main valve body 11 is provided with an external thread, the end cover 23 and the main valve body 11 are fixed by a threaded connection, along the axial direction of the hole portion 220, the second cylindrical portion 222 has a fourth end face 2221 on the side away from the base portion 311, and the second cylindrical portion 222 has a fifth end face 2222 on the side close to the base portion 311, the fourth end face 2221 is abutted against the end wall of the end cover cavity 231, and the fifth end face 2222 is abutted against the upper end face of the main valve body 11. Among them, the end cover 23 can be pressed into the second cylinder portion 222 to fix the valve cover 22 on the main valve body 11. The valve cover 22 only needs to ensure the axial centering of the first cylinder portion 221 and the main valve cavity 111, and the axial centering of the hole portion 220 and the protrusion 312, to compensate for the direct assembly of the valve cover 22 and the main valve body 11 and the errors that may occur during the processing of the valve cover 22, thereby improving the assembly efficiency.

[0034] At the same time, combined with the above content, such as Figure 4 Or as shown in Figure 6, in order to ensure that the sealing ring can achieve effective sealing, under the premise of reducing the volume of the valve cover 22 as much as possible, it is necessary to avoid the wall thickness of the part between the bottom of the installation groove 2213 and the limiting portion 22121 being too small, which will affect the strength of the valve cover 22 in the above-mentioned part. Therefore, in this embodiment, the groove top height of the second circulation groove 2252 is lower than the groove top height of the first circulation groove 2251.

[0035] In this embodiment, the end cover 23 further includes an end cover through hole 232 connected to the end cover cavity 231, and the valve cover 22 further includes a third barrel portion 227. In the axial direction of the hole portion 220, the third barrel portion 227 protrudes from the fourth end surface 2221 toward the side away from the base portion 311, and the third barrel portion 227 passes through the end cover through hole 232; the hole portion 220 includes a first hole section 2201 and a second hole section 2202, the second hole section 2202 is connected to the end of the first hole section 2201 away from the base portion 311, the first guide channel 224 is located in the first hole section 2201, and the pilot valve sleeve 21 is partially located in the second hole section 2202. The inner diameter of the first hole section 2201 is smaller than the inner diameter of the second hole section 2202, and a step portion is included between the first hole section 2201 and the second hole section 2202. The axial distance of the hole portion 220 can be increased by the third cylinder portion 227, thereby increasing the axial distance of the first hole section 2201 to ensure the connection stability of the guide valve sleeve 21, and at the same time increasing the axial distance of the second hole section 2202, which can correspondingly increase the axial length of the protrusion 312, thereby ensuring the stability of the protrusion 312 when sliding.

[0036] Figure 6 A schematic diagram of the structure of another valve cover in the solenoid valve provided by the utility model; Figure 7 for Figure 6 Schematic cross-sectional view of the cooperation between the middle sleeve and the valve cover.

[0037] As an example, the hole wall of the hole portion 220 has a first spiral portion 224b. The first spiral portion 224b has a spiral structure rising along the axial direction of the hole portion 220 from the second end face 2212. The first spiral portion 224b serves as the first diversion channel 224 mentioned above. Specifically, along the spiral direction of the first spiral portion 224b, a first spiral channel 224b1 is formed between adjacent tooth portions of the spiral portion 224b. By providing continuous and effective diversion of the medium in the circumferential direction of the hole portion 220 through the spiral portion 224b, the medium acts on the outer surface of the protruding portion 312 in the circumferential direction of the hole portion 220, making it easy for the piston 31 to move upward, improving the response rate of the piston 31, and ensuring that the piston 31 can slide into place, thereby improving the valve opening performance of the solenoid valve.

[0038] Figure 8 This is a schematic cross-sectional view of another valve cover in the solenoid valve provided by the present invention; Figure 9 is Figure 8 the schematic cross-sectional view of the valve cover in

[0039] As an example, different from the above example, the first diversion channel 224 is located on the protruding portion 312 of the piston 31. Specifically, the outer surface of the protruding portion 312 has a plug body vertical groove 224c. The plug body vertical groove 224c extends along the axial direction of the hole portion 220. The plug body vertical groove 224c includes a second upper port portion and a first lower port portion. The second upper port portion is located at the first end face 3121, and the first lower port portion is located at the third end face 3113. The plug body vertical groove 224c serves as the first diversion channel 224. The plug body vertical groove 224c includes a third diversion groove 224c1 and a fourth diversion groove 224c2.

[0040] Among them, the number of the third diversion groove 224c1 and the fourth diversion groove 224c2 is the same, and the number is at least one; through the plug body vertical groove 224c, continuous and effective diversion of the medium can be provided. The opening direction of the plug body vertical groove 224c is consistent with the moving direction of the protruding portion 312. Moreover, the third diversion groove 224c1 and the fourth diversion groove 224c2 are symmetrically arranged in the radial direction of the hole portion 220. By means of the third diversion groove 224c1 and the fourth diversion groove 224c2, it is easy for the piston 31 to move upward, improving the moving rate of the piston 31, and ensuring that the piston 31 can slide into place, thereby improving the valve opening performance of the solenoid valve.

[0041] In this embodiment, the cross-section of the plug body vertical groove 224c is circular arc-shaped. Of course, it can also be other shapes such as square.

[0042] Figure 10 This is a schematic cross-sectional view of yet another valve cover in the solenoid valve provided by the present invention.

[0043] As an example, different from the above example, the first diversion channel 224 is located at the protruding portion 312 of the piston 31. Specifically, the outer surface of the protruding portion 312 has a second spiral portion 224d. The second spiral portion 224d is a spiral structure rising along the axial direction of the hole portion 220. The second spiral portion 224d serves as the first diversion channel 224. The second spiral portion 224d includes a second upper port portion and a first lower port portion. The second upper port portion is located at the first end surface 3121, and the first lower port portion is located at the third end surface 3113. Among them, along the spiral direction of the second spiral portion 224d, a second spiral channel 224d1 is formed between adjacent tooth portions of the second spiral portion 224d. By providing continuous and effective diversion to the medium in the circumferential direction of the hole portion 220 through the second spiral portion 224d, the medium acts on the outer surface of the protruding portion 312 in the circumferential direction of the hole portion 220, making it easy for the piston 31 to move upward, improving the response rate of the piston 31, and ensuring that the piston 31 can slide in place, thereby improving the valve opening performance of the solenoid valve.

[0044] The technical features of the above-described embodiments can be combined. For the sake of concise description, 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, it should be considered as the scope recorded in this specification.

[0045] The above-described embodiments only represent several implementation manners of the present utility model. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and controls can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. A solenoid valve, characterized in that: It includes a main valve component (1), a pilot valve component (2) and a piston component (3). The solenoid valve includes a main valve cavity (111). The piston component (3) is located in the main valve cavity (111). The piston component (3) includes a piston (31). The piston (31) includes a base portion (311) and a protruding portion (312). The base portion (311) is located inside the main valve component (1). The base portion (311) is slidably mated with the main valve component (1). The pilot valve component (2) includes a valve cover (22). The valve cover (22) has a hole portion (220). The protruding portion (312) is slidably mated with the hole portion (220). At least one of the protruding portion (312) and the hole portion (220) includes a first flow guiding channel (224). In the valve closing state of the solenoid valve, the main valve cavity (111) includes a first cavity (a), a second cavity (b), and a third cavity (c). The portion between the base portion (311) and the valve cover (22) serves as the first cavity (a). The pilot valve component (2) further includes an armature component. The portion between the armature component and the protruding portion (312) serves as the second cavity (b). The first flow guiding channel (224) communicates the first cavity (a) and the second cavity (b). The base portion (311) includes a second flow guiding channel (3114). The main valve component (1) includes a bottom end portion (1111). The portion between the base portion (311) and the bottom end portion (1111) serves as the third cavity (c). The second flow guiding channel (3114) communicates the second cavity (b) and the third cavity (c).

2. The solenoid valve according to claim 1, characterized in that: The first flow guiding channel (224) includes a first upper port portion (2242). The side of the protruding portion (312) away from the base portion (311) has a first end face (3121). In the valve opening state of the solenoid valve, the height of the position where the first upper port portion (2242) is located is greater than or equal to the height of the position where the first end face (3121) is located.

3. The solenoid valve according to claim 1, wherein: The hole portion (220) includes a flared portion (223). The side of the valve cover (22) close to the base portion (311) has a second end face (2212). The large diameter end of the flared portion (223) is connected to the second end face (2212).

4. The solenoid valve according to claim 2 or 3, characterized in that: The hole wall of the hole portion (220) has a groove portion (224a). The groove portion (224a) serves as the first flow guiding channel (224). The side of the valve cover (22) close to the base portion (311) has a second end face (2212). The groove portion (224a) extends along the axial direction of the hole portion (220) from the second end face (2212). The groove portion (224a) includes a first flow guiding groove (224a1) and a second flow guiding groove (224a2). The first flow guiding groove (224a1) and the second flow guiding groove (224a2) are symmetrically arranged in the radial direction of the hole portion (220).

5. The solenoid valve according to claim 2 or 3, characterized in that: The pore wall of the pore portion (220) has a first helical portion (224b). The valve cover (22) has a second end face (2212) on the side close to the base portion (311). The first helical portion (224b) is in a helical structure rising axially along the pore portion (220) from the second end face (2212). The first helical portion (224b) serves as the first flow guiding channel (224).

6. The solenoid valve according to claim 1, characterized in that: The valve cover (22) has a second end face (2212) on the side close to the base portion (311). The valve cover (22) has a flow-through portion (225) and an annular groove (226). The flow-through portion (225) is recessed inward from the second end face (2212) in a direction away from the base portion (311). The annular groove (226) is recessed inward from the second end face (2212) in a direction away from the base portion (311). In the radial direction of the pore portion (220), the annular groove (226) is located between the pore portion (220) and the outer surface of the valve cover (22). The flow-through portion (225) includes a first flow-through groove (2251) and a second flow-through groove (2252). The first flow-through groove (2251) communicates the annular groove (226) and the pore portion (220) in the radial direction of the pore portion (220). The second flow-through groove (2252) communicates the outer surface of the valve cover (22) and the annular groove (226) in the radial direction of the pore portion (220).

7. The solenoid valve according to claim 1, wherein: The outer surface of the protruding portion (312) has a plug vertical groove (224c). The plug vertical groove (224c) serves as the first flow guiding channel (224). The plug vertical groove (224c) extends axially along the pore portion (220). The plug vertical groove (224c) includes a second upper port portion and a first lower port portion. The protruding portion (312) has a first end face (3121) on the side away from the base portion (311). The second upper port portion is located at the first end face (3121). The base portion (311) has a third end face (3113) on the side close to the protruding portion (312). The first lower port portion is located at the third end face (3113). The plug vertical groove (224c) includes a third flow guiding groove (224c1) and a fourth flow guiding groove (224c2). The third flow guiding groove (224c1) and the fourth flow guiding groove (224c2) are symmetrically arranged in the radial direction of the pore portion (220).

8. The solenoid valve according to claim 1, characterized in that: The outer surface of the protruding portion (312) has a second helical portion (224d), the second helical portion (224d) is in a helical structure rising along the axial direction of the hole portion (220), the second helical portion (224d) serves as the first diversion channel (224), the second helical portion (224d) includes a second upper port portion and a first lower port portion, the side of the protruding portion (312) away from the base portion (311) has a first end face (3121), the second upper port portion is located on the first end face (3121), the side of the base portion (311) close to the protruding portion (312) has a third end face (3113), and the first lower port portion is located on the third end face (3113).

9. The solenoid valve according to any one of claims 1-8, characterized in that: The main valve component (1) includes a main valve body (11), the piston (31) further includes a piston ring component (32), the outer ring surface (3111) of the base portion (311) has a piston groove (3112), the piston ring component (32) is partially located in the piston groove (3112), and the outer peripheral surface of the piston ring component (32) abuts against the inner wall of the main valve body (11); The valve cover (22) includes a first cylindrical portion (221) and a second cylindrical portion (222), the first cylindrical portion (221) is at least partially located in the main valve cavity (111), the valve cover (22) further includes a sealing ring, the outer surface of the first cylindrical portion (221) has a mounting groove (2213), the sealing ring is partially located in the mounting groove (2213), the outer dimension of the second cylindrical portion (222) is larger than the inner dimension of the main valve cavity (111), the pilot valve component (2) further includes an end cover (23), the end cover (23) has an end cover cavity (231), the inner wall of the end cover cavity (231) is in threaded cooperation with the outer surface of the main valve body (11), along the axial direction of the hole portion (220), the side of the second cylindrical portion (222) away from the base portion (311) has a fourth end face (2221), the side of the second cylindrical portion (222) close to the base portion (311) has a fifth end face (2222), the fourth end face (2221) abuts against the end wall of the end cover cavity (231), and the fifth end face (2222) abuts against the upper end face of the main valve body (11).

10. The solenoid valve according to claim 9, characterized in that: The end cap (23) further includes an end cap through-hole (232) connected to the end cap cavity (231). The valve cover (22) further includes a third cylindrical part (227). Axially of the hole part (220), the third cylindrical part (227) protrudes from the fourth end face (2221) towards the side away from the base part (311), and the third cylindrical part (227) passes through the end cap through-hole (232). The hole part (220) includes a first hole section (2201) and a second hole section (2202). The second hole section (2202) is connected to the end of the first hole section (2201) away from the base part (311). The first diversion channel (224) is located in the first hole section (2201). The pilot valve component (2) further includes a pilot valve sleeve (21). The pilot valve sleeve (21) is partially located in the second hole section (2202). The inner diameter of the second hole section (2202) is smaller than that of the first hole section (2201). A step part is included between the first hole section (2201) and the second hole section (2202). The iron core component includes a moving iron core (24), a static iron core (25), a pilot valve core (26), a first spring (27), a second spring (28), and an annular block (29). The static iron core (25) is fixed in the inner cavity (211) of the valve sleeve (21). The moving iron core (24) slides in the inner cavity (211). The moving iron core (24) has a first inner hole (241) on the side close to the static iron core (25). The first spring (27) is at least partially located in the first inner hole (241). One end of the first spring (27) abuts against the moving iron core (24), and the other end of the first spring (27) abuts against the static iron core (25). The moving iron core (24) has a second inner hole (242) on the side away from the static iron core (25). The pilot valve core (26) is partially located in the second inner hole (242). The second inner hole (242) communicates with the first inner hole (241). The annular block (29) is limited at the bottom of the second inner hole (242). One end of the second spring (28) abuts against the boss part of the pilot valve core (26), and the other end of the second spring (28) abuts against the upper surface of the annular block (29). The pilot valve core (26) has an extending section (261). The extending section (261) passes through the annular block (29) and extends out of the second inner hole (242). The piston (31) further includes a receiving cavity (34). A pilot valve seat (33) is provided at the bottom of the receiving cavity (34). The extending section (261) can abut against the pilot valve orifice (331) of the pilot valve seat (33).

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