Electromagnetic valve

Abstract

The electromagnetic valve comprises a valve body component, a pilot pipe and a piston component, the valve body component comprises a valve body and a valve cover component, and the valve cover component is fixedly connected with the valve body; the pilot pipe is located on the outer side of the valve body, the end of one side of the pilot pipe is connected with the valve deck part, the end of the other side of the pilot pipe is connected with the valve body, the pilot pipe is provided with a pipe cavity, the valve body part comprises a pilot valve cavity and a main valve port part, and the piston part comprises a piston head. The piston head can abut against the main valve port portion, a back pressure cavity is formed between the piston head and the valve deck component, and the pipe cavity is communicated with the back pressure cavity and the guide valve cavity. According to the electromagnetic valve, the pilot pipe and the valve body are of the split structure, the pilot pipe is located on the outer side of the valve body, the pilot pipe is convenient to machine, the size of the valve body can be reduced, and the valve body is more convenient to machine.

Description

Technical Field

[0001] This invention relates to the field of valve technology for refrigeration systems, and more specifically, to a solenoid valve. Background Technology

[0002] In valves used in refrigeration systems Figure 1 This is a cross-sectional schematic diagram of a solenoid valve in the background art. The solenoid valve includes a valve body component, a pilot valve component 2', and a piston 3'. The valve body component includes a valve body 1' made of brass. The valve body 1' has a piston chamber 12' that slides with the piston 3'. The pilot valve component 2' is partially located in the pilot chamber 13' of the valve body 1'. The valve body 1' has a pilot flow channel 11' inside, which connects the piston chamber 12' and the pilot chamber 13'. Summary of the Invention

[0003] Based on the solenoid valves in the background technology, the valve body is not only large in size but also heavy in weight, resulting in high cost. When processing the valve body, the inventors found that it is difficult to directly process the pilot flow channel inside the valve body, which leads to low processing efficiency of the valve body.

[0004] This invention provides a solenoid valve, comprising a valve body component, a pilot guide, and a piston component. The valve body component includes a valve body and a valve cover component, the valve cover component being fixedly connected to the valve body. The pilot guide is located outside the valve body, one end of the pilot guide is connected to the valve cover component, and the other end of the pilot guide is connected to the valve body. The pilot guide has a cavity. The valve body component includes a pilot valve cavity and a main valve port. The piston component includes a piston head, the piston head being able to abut against the main valve port. A back pressure cavity is included between the piston head and the valve cover component. The cavity connects the back pressure cavity and the pilot valve cavity. The valve body component includes an inlet port and an outlet port, and the pilot valve cavity is able to communicate with the outlet port.

[0005] The solenoid valve provided in this application has a separate structure for the pilot tube and the valve body, with the pilot valve located on the outside of the valve body. This not only makes the processing of the pilot tube easier but also reduces the size of the valve body, and makes the processing of the valve body more convenient. Attached Figure Description

[0006] Figure 1 Background Art: A cross-sectional schematic diagram of a solenoid valve;

[0007] Figure 2 : A cross-sectional schematic diagram of the solenoid valve provided by the present invention in the closed state;

[0008] Figure 3 : Figure 2 A cross-sectional schematic diagram of the solenoid valve in the open state;

[0009] Figure 4 : Figure 2 Enlarged view of point A in the middle;

[0010] Figure 5 : Figure 3 Enlarged view of point B in the middle;

[0011] Figure 6 : Figure 2 A three-dimensional schematic diagram of the piston;

[0012] Figure 7 : A cross-sectional schematic diagram of another solenoid valve provided by the present invention in the closed state;

[0013] Figure 8 : Figure 7 Enlarged view of point C in the middle;

[0014] Figure 9 The present invention also provides a cross-sectional schematic diagram of a solenoid valve in the closed state.

[0015] Figure 10 : Figure 9 Enlarged diagram of point D in the middle.

[0016] Figure 2-10 The attached figures are labeled as follows:

[0017] 1-Valve body component, 10a-First guide section, 10b1-Second guide section, 10b2-Third guide section, 10c-Fourth guide section, 101-Valve pilot chamber, 11-Valve body, 111-Valve pilot port, 112-Second step section, 113-Second hole, 114-Main body, 115-Valve pilot connection section, 116-Inflow port, 117-Outflow port, 12 / 12A / 12B-Valve cover component, 121 / 12A1 / 12B1-Cover body, 1211-First step section, 12 A12 - Cup-shaped part, 12A13 - Outwardly protruding part, 122 / 12A2 / 12B2 - Connecting seat, 1221 - First connecting part, 1222 - Second connecting part, 1223 - First hole, 12B24 - Seat body part, 12B25 - First bent part, 12B26 - Second bent part, 1227 - Bending section, 13 - Valve port seat, 131 - Base, 1311 - Side hole, 132 - Support part, 133 - Main valve port part, 14 - Back pressure chamber, 15 - Inlet pipe, 16 - Outlet pipe

[0018] 2 / 2A - First catheter, 21 / 21A - Lumen

[0019] 3-Piston assembly, 31 / 31A / 31B-Piston, 310-Cavity, 311 / 31A1 / 31B1-Body part, 312 / 31A2 / 31B2-Cylindrical part, 313a / 313b / 313c-Flow port or flow hole, 314-Balance hole, 315-Annular groove, 32-Piston ring, 33-Second elastic element,

[0020] 4-Pilot valve component, 41-Core iron, 42-End cap, 43-Steel ball, 44-First elastic element, 45-Cylindrical tube. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the accompanying drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The directional terms such as "up" and "down" used herein are... Figure 2 The positions of the components shown are defined only for clarity and convenience in expressing the technical solution. It should be understood that the directional terms used herein should not limit the scope of protection claimed in this application.

[0022] Figure 2 A cross-sectional schematic diagram of the solenoid valve provided by the present invention in the closed state; Figure 3 for Figure 2 A cross-sectional schematic diagram of the solenoid valve in the open state; Figure 4 for Figure 2 Enlarged view of point A in the middle; Figure 5 for Figure 3 Enlarged view of point B in the middle; Figure 6 for Figure 2 A three-dimensional schematic diagram of the piston.

[0023] It should be noted that, with Figure 2 For example, the axial direction of the inlet pipe 15 is the transverse direction of the solenoid valve, while the axial direction of the pilot pipe 2 and the axial direction of the outlet pipe 16 are the longitudinal direction of the solenoid valve.

[0024] As shown in the figure, the solenoid valve of this embodiment includes a valve body component 1, a piston component 3 and a pilot valve component 4. The valve body component 1 includes a valve body 11, an inlet pipe 15 and an outlet pipe 16. The valve body 11 has an inflow port 116 and an outflow port 117. The inlet pipe 15 is connected to the inflow port 116 and the outlet pipe 16 is connected to the outflow port 117.

[0025] The valve body component 1 includes a first guide portion 10a, and a piston component 3 is slidably engaged with the first guide portion 10a. The piston component 3 includes a piston 31 and a first elastic element 33. The piston 31 is generally cylindrical. The valve body component 1 also includes a valve cover component 12, which is fixedly connected to the valve body 11. One end of the first elastic element 33 abuts against the piston 31, and the other end of the first elastic element 33 abuts against the valve cover component 12. The piston component 3 also includes a piston ring 32. The outer circumferential surface of the piston 31 has an annular groove 315, and the piston ring 32 is partially located in the annular groove 315. The outer annular surface of the piston ring 32 abuts against the inner wall of the guide portion. The piston 31 includes a cavity 310 and a balance hole 314. The back pressure chamber 14 includes at least a portion of the cavity 310. The balance hole 314 is located in the piston head and connects the cavity 310 and the main valve chamber of the valve body 11.

[0026] The pilot valve component 4 includes a sleeve 45 and a core iron component. The sleeve 45 is welded and fixed to the valve body 11. The core iron component includes a core iron 41, a head 42, a steel ball 43, and a second elastic element 44. The core iron 41 is partially located inside the sleeve 45 and can slide within the sleeve 45. The head 42 is fixedly connected to the inner wall of the sleeve 45. The second elastic element 44 is a spring, with one end abutting against the core iron 41 and the other end abutting against the head 42. The steel ball 43 is connected to the core iron 41, specifically through riveting to limit or fix the two. The valve body 11 also includes a pilot valve port 111. When the solenoid valve is closed, the steel ball 43 abuts against the pilot valve port 111.

[0027] In this embodiment, the solenoid valve further includes a pilot guide 2, which is located outside the valve body 11 and is fixedly connected to the valve body 11 and the valve cover component 12. Specifically, one end of the pilot guide 2 is connected to the valve cover component 12, and the other end of the pilot guide 2 is connected to the valve body 11. The pilot guide 2 has a cavity 21. The valve body component 1 includes a pilot valve cavity 101 and a main valve port 133. The piston component 3 includes a piston head that can abut against the main valve port 133. A back pressure cavity 14 is included between the piston head and the valve cover component 12. The cavity 21 connects the back pressure cavity 14 and the pilot valve cavity 101. The valve body component 1 includes an inflow port 116 and an outflow port 117. The pilot valve cavity 101 can communicate with the outflow port 117. The valve body 11 and the pilot tube 2 are separate structures. Unlike the pilot flow channel in the prior art, the pilot tube 2 in this embodiment is easy to process as a separate component, which makes the valve body 11 easier to process and can also reduce the volume of the valve body 11, thereby improving the processing efficiency of the solenoid valve.

[0028] Based on the above, a supplementary explanation is provided regarding the machining method of directly machining the pilot flow channel inside the valve body in the background art. It should be noted that if the pilot flow channel as described in the background art is directly machined inside the valve body 11, there are certain requirements for the length of the pilot flow channel to ensure it meets the requirement of connecting the back pressure chamber 14 and the pilot valve chamber 101. It is understandable that, especially when the valve body 11 is made of stainless steel, if the length of the machined pilot flow channel inside the stainless steel valve body 11 is too long, firstly, it will affect the tool life. Due to the poor thermal conductivity and low elastic modulus of stainless steel, machining the pilot flow channel is relatively difficult, and cutting in the work-hardened region will shorten the tool life; moreover, if the pilot flow channel is too long, the rigidity of the tool will decrease, making it prone to bending or breakage. Secondly, it will affect the cutting force of the tool. Because stainless steel has high hardness, the tangential stress and plastic deformation are large during cutting, resulting in a large cutting force. When the tool overhang is long, it will increase the cutting force, causing the tool to deflect and gradually move the tool away from the blank of the valve body 11, thereby reducing the machining quality.

[0029] In summary, the solenoid valve of this embodiment, by separately providing a pilot guide 2 on the outside of the valve body 11, can reduce the volume of the valve body 11, thereby effectively reducing the manufacturing cost of the solenoid valve, and making the valve body 11 easier to process. It should be noted that directly machining the pilot flow channel as described in the background art inside the valve body 11 usually requires higher manufacturing precision and more complex processing techniques, resulting in a relatively high manufacturing cost for the solenoid valve. This is especially true for precision machining on stainless steel materials, which increases the manufacturing difficulty and cost of the valve body 11.

[0030] Furthermore, such as Figure 3 , Figure 5 As shown, in this embodiment, the valve cover component 12 includes a connecting seat 122, which is fixedly connected to the valve body 11. The connecting seat 122 includes a first hole 1223, one end of the pilot guide 2 is located in the first hole 1223, and one end of the pilot guide 2 is welded and fixed to the connecting seat 122. The valve body 11 includes a second hole 113, the other end of the pilot guide 2 is located in the second hole 113, and the other end of the pilot guide 2 is welded and fixed to the valve body 11. Therefore, the connection strength of the pilot guide 2 can be improved, thereby ensuring that the pilot guide 2 has sufficient stability performance during the operation of the solenoid valve.

[0031] In this embodiment, the first conduit 2 is made of stainless steel tubing, such as... Figure 1-2 As shown in Figure 5, the valve body 11 includes a main body 114 and a pilot valve connection 115. The main body 114 is welded and fixed to the valve cover component 12. The pilot valve connection 115 is laterally protruding relative to the main body 114. The pilot valve connection 115 includes at least a portion of the pilot valve cavity 101. The second hole 113 is located on the wall of the pilot valve connection 115 to facilitate the installation and welding of the pilot guide 2.

[0032] The pilot tube 2 is perpendicular to the pilot valve connection 115, meaning it extends longitudinally along the solenoid valve. Therefore, the upper opening of the second hole 113 faces the valve cover component 12. The pilot tube 2 is a straight tube, which shortens the flow path of the refrigerant between the back pressure chamber 14 and the pilot valve chamber 101. Furthermore, while meeting the installation process requirements for the pilot tube 2, it is positioned as close as possible to the outer surface of the main body 114 to further shorten the refrigerant flow path. This effectively improves the response rate of the piston component 2, thereby enhancing the opening and closing performance of the solenoid valve.

[0033] In this embodiment, the valve body component 1 further includes a valve port seat 13, which is a stamped part and cylindrical in shape. The valve port seat 13 is fixedly connected to the valve body 11. The valve port seat 13 includes a support portion 132, which includes a main valve port portion 133. The valve body component 1 includes a communicating channel located between the main valve port portion 133 and the outlet pipe 16. The communicating channel can connect the pilot valve chamber 101 and the outflow port 117. It should be noted that the higher the main valve port portion 133 is in the longitudinal height position of the solenoid valve, the smaller the size of the piston 31 can be. This not only reduces the cost of the piston 31 but also reduces the overall weight of the solenoid valve, making the solenoid valve lightweight.

[0034] In this embodiment, the valve body 11 includes a pilot valve port 111, which is capable of communicating with the pilot valve cavity 101. The communication channel includes at least a portion of the pilot valve port 111. The valve seat 13 also includes a base 131, which protrudes from the support portion 132 in a direction away from the piston component 3. The base 131 is welded and fixed to the outlet port 117. When the valve seat 13 is installed to the outlet port 117, the base 131 can provide guidance for the valve seat 13, so that the valve seat 13 can be quickly installed and positioned, while ensuring the connection strength between the valve seat 13 and the valve body 11.

[0035] In this embodiment, the base 131 includes a side hole 1311, and the communicating channel also includes at least a portion of the side hole 1311. The side hole 1311 connects the inner cavity of the pilot valve port 111 and the valve seat 13. The inner diameter of the side hole 1311 is greater than or equal to the inner diameter of the pilot valve port 111. This ensures that the response rate of the piston 31 is not affected while improving the connection strength between the valve seat 13 and the valve body 11. Of course, the structure of the communicating channel is not limited to this. For example, the base 131 may not need to include the aforementioned side hole 1311. Specifically, there is a pressure relief gap between the bottom of the base 131 and the top of the outlet pipe 16, and the outlet pipe 16 communicates with the pilot valve port 111 through this pressure relief gap.

[0036] Among them, in such Figure 2-3As shown, a welding ring placement area is provided between the outlet pipe 16 and the valve seat 13. The welding ring placement area is located between the lower end of the valve seat 13 and the upper end of the outlet pipe 16. By placing a welding ring in the welding ring placement area, during furnace welding, the welding ring can weld the outlet pipe 16 and the valve seat 13 together to the valve body 11 through capillary action. Of course, the way the outlet pipe 16 and the valve seat 16 are fixed to the valve body 11 is not limited to this. The outlet pipe 16 and the valve seat 13 can also be an integral structure, for example, made from a single stainless steel pipe.

[0037] Meanwhile, the cross-section of the outlet pipe 16 can be as follows Figure 2-3 As shown, the inner diameter of the base 131 is larger than the inner diameter of the support 132, so that the main valve port 133 can be fitted with the sealing ring at the bottom of the piston 31. Of course, provided that the sealing performance is guaranteed, the valve port seat 13 can also be a cylindrical shape with the same outer diameter as the base 131 and the support 132. At the same time, it is easy to control the diameter of the main valve port 133.

[0038] In this embodiment, the piston 31 is slidably engaged with the first guide portion 10a. The piston 31 includes a body portion 311 and a cylindrical portion 312. The body portion 311 serves as the piston head, and the cylindrical portion 312 includes a flow port or flow hole 313a. The flow port or flow hole 313a penetrates the inner and outer walls of the cylindrical portion 312. The flow port or flow hole 313a communicates with the cavity 21 through the back pressure chamber 14. In this example, the flow port or flow hole 313a is preferably a flow port with a groove-like structure, and the flow port is located on the top surface of the cylindrical portion 312.

[0039] In this embodiment, the valve cover component 12 is made of stainless steel. The valve cover component 12 includes a cover body 121 and a connecting seat 122. The connecting seat 122 includes a first connecting portion 1221. The cover body 121 is plate-shaped, and the outer edge of the cover body 121 includes a first stepped portion 1211. Figure 4 As shown, in the longitudinal direction of the solenoid valve, the first step surface of the first step portion 1211 faces downward, and the first connecting portion 1221 protrudes upward in the longitudinal direction of the solenoid valve. The first connecting portion 1221 is placed on the first step portion 1211 and is fixedly connected to the first step portion 1211. The valve body 11 includes a second step portion 112, the second step surface of which faces the cover 121. The connecting seat 122 also includes a second connecting portion 1222, which is placed on the second step portion 112 and is fixedly connected to the second step portion 112. A bending section 1227 is included between the first connecting portion 1221 and the second connecting portion 1222, and the second connecting portion 1222 extends laterally toward the solenoid valve through the bending section 1227.

[0040] Therefore, during the processing of valve body component 1, the cover 121 and the connecting seat 122 are separate structures, which can reduce the processing difficulty of valve cover component 12 and valve body 11. After processing, the connecting seat 122 is welded and fixed to the valve body 11. The size of valve body 11 can be reduced by the connecting seat 122, making it easier to process and shape valve body 11.

[0041] Based on the above, when the solenoid valve is in the closed state (in conjunction with...) Figure 2 (For explanation), inlet port 116 is the high-pressure refrigerant area. The high-pressure refrigerant reaches cavity 310 through balance hole 314 of piston 31. The sum of the refrigerant pressure on the upper part of piston 31 and the pressure applied by the first elastic element 33 is greater than the refrigerant pressure on the lower part of piston 31, keeping piston 31 in contact with main valve port 133, i.e., main valve port 133 is closed, and the flow path between inlet pipe 15 and outlet pipe 16 is disconnected. Please refer to... Figure 3 When the coil (not shown in the figure) is energized, the core iron 41 moves towards the end cap 42 under the action of electromagnetic force, and the steel ball 43 disengages from the pilot valve port 111, causing the pilot valve port 111 to open. The pilot valve chamber 101 is connected to the outlet port 117, so that the solenoid valve is switched from the closed state to the open state. Therefore, the high-pressure refrigerant above the piston 31 flows into the pilot valve chamber 101 through the cavity 21 of the pilot guide 2. The pilot guide 2 shortens the flow path of the refrigerant, which increases the rate at which the refrigerant flows from the pilot valve port 111 to the outlet pipe 16. At the same time, the sum of the refrigerant pressure on the upper part of the piston 21 and the pressure applied by the first elastic element 33 is less than the refrigerant pressure on the lower part of the piston 31. Under the action of the pressure difference, the piston 31 disengages from the main valve port 133, and the solenoid valve opens, so that the inlet pipe 15 is connected to the outlet pipe 16.

[0042] Figure 7 A cross-sectional schematic diagram of another solenoid valve provided by the present invention in the closed state; Figure 8 for Figure 7 Enlarged diagram of point C in the middle.

[0043] As an example, unlike the above example, the structure of the valve cover component 12A is different from that of the valve cover component 12, and its function is not exactly the same. Specifically, the piston 31A includes a body part 31A1 and a cylindrical part 31A2. The body part 31A1 serves as the piston head, and the cylindrical part 31A2 includes a flow port or flow hole 313b. The flow port or flow hole 313b penetrates the inner and outer cylindrical walls of the cylindrical part 31A2. In this example, the flow port or flow hole 313b is preferably a flow hole. The outer diameter of the body part 31A1 is greater than or equal to the outer diameter of the cylindrical part 31A2. The flow port or flow hole 313b is connected to the tube 21 through the back pressure chamber 14. The valve body 11 includes a second guide portion 10b1, with the main body portion 31A1 slidingly engaged with the second guide portion 10b1. The valve cover component 12A is cup-shaped and includes a third guide portion 10b2, with the cylindrical portion 31A2 slidingly engaged with the third guide portion 10b2. Based on the above example of the pilot guide 2, this example separates the part slidingly engaged with the piston 31 through the second guide portion 10b1 and the third guide portion 10b2. While ensuring the guide length, the height of the pilot guide 2A in this example can be reduced. Figure 2 Compared to the example shown, the refrigerant flow path is further shortened, the response rate of piston 31 is improved, and thus the opening and closing performance of the solenoid valve is enhanced.

[0044] In this embodiment, the valve cover component 12A includes a cover body 12A1 and a connecting seat 12A2. The cover body 12A1 includes a cup-shaped portion 12A12 and an outwardly protruding portion 12A13. In the longitudinal direction of the solenoid valve, the inner wall of the cup-shaped portion 12A12 serves as a third guide portion 10b2. In the transverse direction of the solenoid valve, the outwardly protruding portion 12A13 protrudes from the cup-shaped portion 12A11 toward the side away from the piston 31A. The outwardly protruding portion 12A13 is fixedly connected to the connecting seat 12A2, and the connecting seat 12A2 is fixedly connected to the valve body 11. In this embodiment, the connection is specifically fixed by welding. It can be understood that, under the premise of ensuring the sliding stability of the piston 31, the larger the depth of the cup-shaped cavity of the cup-shaped portion 12A12, the lower the height of the connecting seat 12A2 on the valve body 11, the smaller the longitudinal dimension of the pilot guide 2A in the solenoid valve, and the faster the response rate of the piston 31A. Correspondingly, in the longitudinal direction of the solenoid valve, the flow port or flow orifice 313b is close to the bottom wall of the cavity 310.

[0045] In this embodiment, the connecting seat 12A2 includes a first hole 1223, one end of the pilot tube 2A is located in the first hole 1223, and one end of the pilot tube 2A is welded and fixed to the connecting seat 12A2. The cavity 21A is connected to the back pressure cavity 14. The valve body 11 includes a second hole 113, the other end of the pilot tube 2A is located in the second hole 113, the cavity 21A is connected to the pilot valve cavity 101, and the other end of the pilot tube 2A is welded and fixed to the valve body 11 to improve the connection strength of the pilot tube 2, thereby ensuring that the pilot tube 2A has sufficient stability performance during the operation of the solenoid valve.

[0046] Figure 9 A cross-sectional schematic diagram of a solenoid valve in the closed state is also provided for the present invention. Figure 10 for Figure 9 Enlarged diagram of point D in the middle.

[0047] As an example, unlike the example above, the structure of this valve cover component 12B is different from that of the valve cover component 12 described above, and its function is not entirely the same. Specifically, the valve cover component 12B includes a fourth guide portion 10c, and the piston 31B slides in conjunction with the fourth guide portion 10c; the piston 31B includes a body portion 31B1 and a cylindrical portion 31B2, the body portion 31B1 serving as the piston head, and the cylindrical portion 31B2 including a flow port or flow hole 313c, the flow port or flow hole 313c penetrating the inner and outer cylindrical walls of the cylindrical portion 31B2. In this example, the flow port or flow hole 313c is preferably a flow port, the flow port having a groove-like structure, and the flow port being located on the top surface of the cylindrical portion 31B2. The flow port or flow hole 313c is connected to the pipe cavity 21 through the back pressure cavity 14. The fourth guide portion 10c in this example is easier to machine than the mating part with the piston 31B that is directly machined inside the valve body 11, thereby improving the machining efficiency of the solenoid valve.

[0048] The valve cover component 12B includes a cover body 12B1 and a connecting seat 12B2. The cover body 12B1 is plate-shaped, and the connecting seat 12B2 includes a seat portion 12B24, a first bending portion 12B25, and a second bending portion 12B26. The seat portion 12B24 is cylindrical, and the inner wall of the seat portion 12B24 serves as a fourth guide portion 10c. In the transverse direction of the solenoid valve, the first bending portion 12B25 bends from the seat portion 12B24 toward the side away from the piston 31B. In the longitudinal direction of the solenoid valve, the second bending portion 12B26 bends from the first bending portion 12B25 toward the side away from the piston 31B. The second bending portion 12B26 is fixedly connected to the cover body 12B1, and the seat portion 12B24 is fixedly connected to the valve body 11. When the connector 12B2 in this example is machined separately, it makes the fourth guide part 10c easier to process during the machining process, and can also effectively ensure the machining accuracy of the fourth guide part 10c, improve the response speed of the piston component 3, and thus improve the opening and closing performance of the solenoid valve.

[0049] The technical features of the above embodiments can be combined. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A solenoid valve, characterized in that, It includes a valve body component (1), a pilot guide (2) and a piston component (3). The valve body component (1) includes a valve body (11) and a valve cover component (12). The valve cover component (12) is fixedly connected to the valve body (11). The pilot tube (2) is located outside the valve body (11). One end of the pilot tube (2) is connected to the valve cover component (12), and the other end of the pilot tube (2) is connected to the valve body (11). The pilot tube (2) has a cavity (21). The valve body component (1) includes a pilot valve cavity (101) and a main valve port (133). The piston component (3) includes a piston head that can abut against the main valve port (133). A back pressure cavity (14) is included between the piston head and the valve cover component (12). The cavity (21) connects the back pressure cavity (14) and the pilot valve cavity (101). The valve body component (1) includes an inflow port (116) and an outflow port (117). The pilot valve cavity (101) can communicate with the outflow port (117).

2. The solenoid valve according to claim 1, characterized in that, The valve cover component (12) includes a connecting seat (122), which is fixedly connected to the valve body (11). The connecting seat (122) includes a first hole (1223), one end of the pilot guide (2) is located in the first hole (1223), and the valve body (11) includes a second hole (113), the other end of the pilot guide (2) is located in the second hole (113).

3. The solenoid valve according to claim 2, characterized in that, The pilot guide (2) is made of stainless steel tubing. The valve body (11) includes a main body (114) and a pilot valve connection (115). The main body (114) is welded and fixed to the valve cover component (12). The pilot valve connection (115) is laterally protruding relative to the main body (114). The pilot valve connection (115) includes at least a portion of the pilot valve cavity (101). The second hole (113) is located on the wall of the pilot valve connection (115).

4. The solenoid valve according to claim 2, characterized in that, The pilot tube (2) is arranged perpendicularly to the pilot valve connection (115).

5. The solenoid valve according to any one of claims 1-4, characterized in that, The valve body (11) includes a first guide portion (10a), and the piston component (3) includes a piston (31), which is slidably engaged with the first guide portion (10a). The piston (31) includes a body portion (311) and a cylindrical portion (312), the body portion (311) serving as the piston head, and the cylindrical portion (312) including a flow port or flow hole (313a), which penetrates the inner and outer cylindrical walls of the cylindrical portion (312). The flow port or flow hole (313a) is connected to the cavity (21) through the back pressure chamber (14).

6. The solenoid valve according to any one of claims 1-4, characterized in that, The piston component (3) includes a piston (31A), which includes a body portion (31A1) and a cylindrical portion (31A2). The body portion (31A1) serves as the piston head. The valve body (11) includes a second guide portion (10b1), which is slidably engaged with the body portion (31A1) and the second guide portion (10b1). The valve cover component (12A) is cup-shaped and includes a third guide portion (10b2), which is slidably engaged with the cylindrical portion (31A2). The cylindrical portion (31A2) includes a flow port or flow hole (313b), which penetrates the inner and outer cylindrical walls of the cylindrical portion (31A2). The flow port or flow hole (313b) is connected to the cavity (21) through the back pressure chamber (14).

7. The solenoid valve according to claim 6, characterized in that, The valve cover component (12A) includes a cover body (12A1) and a connecting seat (12A2). The cover body (12A1) includes a cup-shaped portion (12A12) and an outwardly protruding portion (12A13). The inner wall of the cup-shaped portion (12A12) serves as the third guide portion (10b2). In the transverse direction of the solenoid valve, the outwardly protruding portion (12A13) protrudes from the cup-shaped portion (12A11) toward the side away from the piston (31A). The outwardly protruding portion (12A13) connects with the connecting seat (12A2). The connecting seat (12A2) is fixedly connected to the valve body (11); the connecting seat (12A2) includes a first hole (1223), one end of the pilot guide (2A) is located in the first hole (1223), the lumen (21A) is connected to the back pressure chamber (14), the valve body (11) includes a second hole (113), the other end of the pilot guide (2A) is located in the second hole (113), and the lumen (21A) is connected to the pilot valve chamber (101).

8. The solenoid valve according to any one of claims 1-4, characterized in that, The valve cover component (12B) includes a fourth guide portion (10c), and the piston component (3) includes a piston (31B). The piston (31B) is slidably engaged with the fourth guide portion (10c). The piston (31B) includes a body portion (31B1) and a cylindrical portion (31B2). The body portion (31B1) serves as the piston head. The cylindrical portion (31B2) includes a flow port or flow hole (313c). The flow port or flow hole (313c) penetrates the inner and outer cylindrical walls of the cylindrical portion (31B2). The flow port or flow hole (313c) communicates with the tube cavity (21) through the back pressure chamber (14).

9. The solenoid valve according to claim 8, characterized in that, The valve cover component (12B) includes a cover body (12B1) and a connecting seat (12B2). The connecting seat (12B2) includes a seat portion (12B24), a first bending portion (12B25), and a second bending portion (12B26). The inner wall of the seat portion (12B24) serves as the fourth guide portion (10c). In the transverse direction of the solenoid valve, the first bending portion (12B25) bends from the seat portion (12B24) toward the side away from the piston (31). In the longitudinal direction of the solenoid valve, the second bending portion (12B26) bends from the first bending portion (12B25) toward the side away from the piston (31B). The second bending portion (12B26) is fixedly connected to the cover body (12B1), and the seat portion (12B24) is fixedly connected to the valve body (11).

10. The solenoid valve according to any one of claims 1-4, characterized in that, The valve cover component (12) includes a cover body (121) and a connecting seat (122). The connecting seat (122) includes a first connecting portion (1221). The outer edge of the cover body (121) includes a first stepped portion (1211). In the longitudinal direction of the solenoid valve, the first stepped surface of the first stepped portion (1211) faces downward. The first connecting portion (1221) is placed on the first stepped portion (1211) and is fixedly connected to the first stepped portion (1211). The valve body (11) includes a second stepped portion (112). The second stepped surface of the second stepped portion (112) faces the cover body (121). The connecting seat (122) also includes a second connecting portion (1222). The second connecting portion (1222) is placed on the second stepped portion (112) and is fixedly connected to the second stepped portion (112).

11. The solenoid valve according to claim 1, characterized in that, The valve body component (1) further includes a valve port seat (13), which is a stamped part. The valve port seat (13) is fixedly connected to the valve body (11). The valve port seat (13) includes a support part (132), which includes the main valve port part (133). The valve body component (1) includes a connecting channel, which can connect the pilot valve chamber (101) and the outlet port (117).

12. The solenoid valve according to claim 11, characterized in that, The valve body (11) includes a pilot valve port (111) which is connected to the pilot valve cavity (101). The connecting channel includes at least a portion of the pilot valve port (111). The valve seat (13) also includes a base (131) which protrudes from the support portion (132) in a direction away from the piston component (3). The base (131) is welded and fixed to the outlet port (117). The base (131) includes a side hole (1311). The connecting channel also includes at least a portion of the side hole (1311). The side hole (1311) connects the pilot valve port (111) and the inner cavity of the valve seat (13).

13. The solenoid valve according to any one of claims 1-12, characterized in that, The valve body (11) and the valve cover component (12) are made of stainless steel. The piston component (3) includes a piston (31). A first elastic element (33) is included between the piston (31) and the valve cover component (12). One end of the first elastic element (33) abuts against the piston (31), and the other end of the first elastic element (33) abuts against the valve cover component (12). The piston (21) includes a balance hole (314). The solenoid valve also includes a pilot valve component (4), the pilot valve component (4) has a core iron component, the core iron component includes a core iron (41) and a steel ball (43), the steel ball (43) is connected to the core iron (41), the valve body (11) includes a pilot valve port (111), and in the closed state of the solenoid valve, the steel ball (33) abuts against the pilot valve port (111).

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