Electromagnetic valve

Abstract

The electromagnetic valve comprises a valve body component and a piston component, the valve body component comprises a valve body and a piston guide part, the valve body is made of stainless steel, the piston guide part is in fixed connection or limited connection with the valve body, the piston guide part is in sliding fit with the piston component, the valve body component comprises a main valve port part, and the main valve port part is provided with a valve opening. The piston component can abut against the main valve port portion, a valve cavity of the electromagnetic valve comprises a pilot cavity, and the pilot cavity is located on the side, away from the main valve port portion, of the piston component in the axial direction of the piston guiding piece. According to the electromagnetic valve, the valve body is made of stainless steel, the piston guide part and the valve body are of a split structure, the piston part and the piston guide part are in sliding fit, the piston guide part is convenient to machine and form, and the size precision of the matched portion of the piston guide part and the piston part is easily guaranteed.

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, and the valve body 1' has a piston guide section 11' machined thereto cooperate with the piston 3'. In the closed state, the piston 3' abuts against the main valve port of the valve body 1'. The solenoid valve generally operates as follows: by energizing or de-energizing the pilot valve component 2', the piston 3' can move away from or abut against the main valve port, thereby controlling the flow and cut-off of refrigerant. 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. After the valve body is made of stainless steel, the solenoid valve has the characteristics of being lead-free, small in size, and light in weight. When processing the stainless steel valve body, the inventors found that: because the piston cooperates with the piston guide section of the valve body, it is difficult to directly process the piston guide section inside the valve body. On the one hand, the dimensional accuracy of the piston guide section cannot be guaranteed; on the other hand, the processing and forming efficiency of the valve body is low.

[0004] This invention provides a solenoid valve, including a valve body component and a piston component. The valve body component includes a valve body and a piston guide. The valve body is made of stainless steel. The piston guide is fixedly connected or limitedly connected to the valve body, and the piston guide is slidably engaged with the piston component. The valve body component includes a main valve port, and the piston component can abut against the main valve port. The valve chamber of the solenoid valve includes a pilot chamber located on the side of the piston component away from the main valve port in the axial direction of the piston guide. The valve body component also includes an end cap, and a flow passage is included between the end cap and the piston guide in the axial direction of the piston guide, or one of the piston guide and the end cap includes a flow passage. The valve body component includes a pilot valve chamber, and the flow passage connects the pilot chamber and the pilot valve chamber. The valve body component includes an inlet end and an outlet end, and the pilot valve chamber can communicate with the outlet end.

[0005] The solenoid valve provided in this application has a valve body made of stainless steel, a piston guide and a valve body that are separate structures, a piston assembly and a piston guide that slide together, a piston guide that is easy to process and form, and a piston guide and piston assembly that are in close contact that are easy to ensure dimensional accuracy, thereby improving the processing and forming efficiency of the solenoid valve. Attached Figure Description

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

[0007] Figure 2 This invention provides a cross-sectional schematic diagram of a solenoid valve 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 3 Enlarged schematic diagram of another example of the flow channel at point B;

[0012] Figure 7 : Figure 3 An enlarged schematic diagram of another example of the flow channel at point B;

[0013] Figure 8 : Figure 2 A three-dimensional schematic diagram of the piston;

[0014] Figure 9 : Figure 2 A cross-sectional view of the valve seat;

[0015] Figure 10 : A cross-sectional schematic diagram of another solenoid valve provided by the present invention in the closed state;

[0016] Figure 11 : Figure 7 Enlarged diagram of point C in the middle.

[0017] Figure 2-11 The attached figures are labeled as follows:

[0018] 1-Valve body component, 101-Main valve chamber, 102-Pilot valve chamber, 103-Pilot chamber, 11-Valve body, 110-Second hole, 111-Inlet end, 112-Main valve port, 113-Flow passage, 114-Pilot valve port, 115-Stepped section, 116-Outlet end

[0019] 12-Piston guide, 12A-Piston guide tube, 13 / 13A-End cap, 131-Cover portion, 132-First cylindrical portion, 133-First annular cavity, 14-Connector, 140-First hole portion, 141-Base portion, 142-Second cylindrical portion, 143-Second annular cavity, 14A1-Cylinder body portion, 14A2-Connecting portion, 14A21-Radial protrusion, 14A22-Axial protrusion, 15-Flow guide, 151-Flow guide hole, 16-Valve seat, 161-Base, 1611-Side hole, 162-Support portion, 18-Inlet pipe, 19-Outlet pipe

[0020] 2-Piston assembly, 21-Piston, 210-Cavity, 211-Balance hole, 212-Guide port, 213-Outer peripheral surface, 2131-First mating part, 2132-Transition part, 2133-Second mating part, 2134-Annular groove, 23-First elastic element, 24-Reserved space

[0021] 3-Pilot valve component, 31-Core iron, 32-End cap, 33-Steel ball, 34-Second elastic element, 35-Sleeve. Detailed Implementation

[0022] 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.

[0023] Figure 2 A cross-sectional schematic diagram of a solenoid valve in the closed state provided by the present invention; 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 3 Enlarged schematic diagram of another example of the flow channel at point B; Figure 7 for Figure 3 An enlarged schematic diagram of another example of the flow channel at point B; Figure 8 : Figure 2 A three-dimensional schematic diagram of the piston; Figure 9 for Figure 2A cross-sectional schematic diagram of the valve seat.

[0024] As shown in the figure, the solenoid valve of this embodiment includes a valve body component 1, a piston component 2, and a pilot valve component 3. The valve body component 1 includes a valve body 11, an inlet pipe 18, and an outlet pipe 19. The valve body 11 has an inlet end 111 and an outlet end 116. The inlet pipe 18 is connected to the inlet end 111, and the outlet pipe 19 is connected to the outlet end 116.

[0025] The piston component 2 includes a piston 21 and a first elastic element 23. The piston 21 is cylindrical. The valve body component 1 also includes an end cap 13. The first elastic element 23 is located between the piston 21 and the end cap 13. The first elastic element 23 is a spring. The piston 21 includes a cavity 210. The pilot cavity 103 mentioned below includes at least a portion of the cavity 210. The opening of the cavity 210 faces the end cap 13 (i.e., longitudinally upward towards the solenoid valve). In the sliding direction of the piston 21, the first elastic element 23 is at least partially located in the cavity 210. One end of the first elastic element 23 abuts against the inner end wall of the cavity 210, and the other end of the first elastic element 23 abuts against the inner end wall of the end cap 13. The piston 21 also includes a balance hole 211 and a guide port 212. The balance hole 211 connects the cavity 210 and the main valve cavity 101 of the valve body 11.

[0026] The pilot valve component 3 includes a sleeve 35 and a core iron component. The sleeve 35 is welded and fixed to the valve body 11. A pilot valve cavity 102 is provided between the valve body 11 and the sleeve 35. The core iron component is partially located in the pilot valve cavity 102. The core iron component includes a core iron 31, a head 32, a steel ball 33, and a second elastic element 34. The core iron 31 is partially located inside the sleeve 35 and can slide within the sleeve 35. The head 32 is fixedly connected to the inner wall of the sleeve 35. The second elastic element 34 is a spring. One end of the second elastic element 34 abuts against the core iron 31, and the other end of the second elastic element 34 abuts against the head 32. The steel ball 33 is connected to the core iron 31, specifically through riveting to achieve a limiting connection or a fixed connection between the two. The valve body 11 also includes a pilot valve port 114. When the solenoid valve is closed, the steel ball 33 abuts against the pilot valve port 114.

[0027] In this embodiment, the valve body 11, end cap 13, and sleeve 35 are made of stainless steel.

[0028] It should be noted that, with Figure 2 For example, the axial direction of the inlet pipe 18 is the transverse direction of the solenoid valve, and the axial direction of the piston guide 12 and the axial direction of the outlet pipe 19 are the longitudinal direction of the solenoid valve.

[0029] In this embodiment, the valve body component 1 further includes a piston guide 12, which is connected to the valve body 11. Specifically, a portion of the piston guide 12 is located outside the valve body 11, and the other portion is fixedly or limitingly connected to the valve body 11. The piston guide 12 and the piston component 2 are slidably engaged. The valve body 11 includes a main valve port 112, and the piston component 2 can abut against the main valve port 112. The valve chamber of the solenoid valve includes a pilot chamber 103. In the axial direction of the piston guide 12, the pilot chamber 103 is located on the side of the piston component 2 away from the main valve port 112 (in conjunction with...). Figure 2 As shown, the pilot chamber 103 is located above the piston component 2; in the axial direction of the piston guide 12 (the axial direction of the piston guide 12 is the sliding direction of the piston 21 mentioned above), there is a flow passage 113 between the end cap 13 and the piston guide 12, or one of the piston guide 12 and the end cap 13 includes a flow passage 113. The flow passage 113 connects the pilot chamber 103 and the pilot valve chamber 102, and the pilot valve chamber 102 can communicate with the outlet end 116. Among them, the piston guide 12 and the valve body 11 are separate structures. The piston guide 12 provides sliding guidance for the piston component 2 in the longitudinal direction of the solenoid valve. The piston guide 12 is easy to process and form, which can not only ensure the dimensional accuracy of the mating part of the piston guide 12 and the piston component 2, but also improve the processing and forming efficiency of the valve body 11, thereby improving the processing and forming efficiency of the solenoid valve.

[0030] In this embodiment, when the piston guide 12 is processed and formed separately, the inner circular surface of the piston guide 12 that mates with the piston 21 is not only easier to process and form during the processing, but also, under the same processing technology and conditions, the processing accuracy of the inner circular surface is higher than that of the piston guide section directly processed in the valve body.

[0031] Based on the above, higher precision of the inner circular surface significantly reduces the frictional resistance between the piston guide 12 and the piston component 2, thereby reducing the unevenness and roughness of the contact surface. This results in less resistance encountered by the piston component 2 during sliding. Compared to the valve body in the prior art where the piston guide section is directly machined within the valve body, the solenoid valve in this embodiment not only improves its operational performance but also helps reduce energy consumption and extend the service life of the equipment. Furthermore, with higher precision of the inner circular surface, the position control of the piston component 2 during movement will be more accurate, thereby reducing vibration or swaying caused by poor fit and improving the operational stability of the piston component 2.

[0032] In this example, such as Figure 8 As shown, the guide port 212 has a groove-shaped structure and is located on the top surface of the piston 21. In the transverse direction of the solenoid valve, the guide port 212 penetrates the outer peripheral surface 213 and the inner peripheral surface of the piston 21.

[0033] Specifically, valve body component 1 also includes a connector 14, which is fixedly connected to valve body 11 and also fixedly connected to end cap 13. End cap 13 includes a cover portion 131, and a flow passage 113 is provided between the cover portion 131 and piston guide 12, or either piston guide 12 or cover portion 131 includes a flow passage 113. The specific contents of the flow passage 113 are described separately as follows:

[0034] by Figure 3-4 Taking the contents shown as an example, the flow passage 113 is located between the cover 131 and the piston guide 12. The piston guide 12 is not connected to the cover 131, and the piston guide 12 is fixedly connected to the valve body 11. The flow passage 113 is the flow interval between the cover 131 and the piston guide 12.

[0035] by Figure 6 Taking the contents shown as an example, the piston guide 12 includes a flow passage 113a. Specifically, the piston guide 12A described below is used as an example of the piston guide 12. However, unlike the piston guide 12A described below, the piston guide 12 is fixedly connected to the cover 131 or integrally formed. The piston guide 12 is not connected to the valve body 11. The flow passage 113a is a flow hole. At least two flow holes are arranged along the circumference of the piston guide 12. The piston guide 12 also includes a protrusion. The protrusion is connected to the cover 131. Along the circumference of the piston guide 12, the protrusion is located between adjacent flow holes.

[0036] by Figure 7 Taking the content shown as an example, the cover 131 includes a flow channel 113b. Specifically, taking the piston guide 12A as an example, the piston guide 12 is fixedly connected to or integrally formed with the cover 131, and is not connected to the valve body 11. The flow channel 113b is a concave groove. At least two concave grooves are arranged along the circumference of the piston guide 12. The concave groove includes a first flow port and a second flow port. The first flow port is located inside the piston guide 12, and the second flow port is located outside the piston guide 12. It should also be noted that the thickness of the cover 131 in this example needs to be greater than the thickness of the cover 131 in the two examples above, to ensure the strength of the cover 131 and the forming of the concave groove.

[0037] In this embodiment, the flow channel 113 is preferably located between the cover 131 and the piston guide 12, and it should be noted that... Figure 4 The example shown is the same as the one above. Figure 6 and Figure 7Compared to the example shown, when the piston guide 12 is not fixedly connected to the end cap 13 or integrally formed, the processing difficulty of the end cap 13 and the piston guide 12 can be reduced, thereby improving the processing efficiency of the solenoid valve.

[0038] It should also be noted that, under the premise of meeting the displacement requirements of the piston 21, the height of the valve body 11 in this embodiment can be smaller than that of the valve body in the prior art due to the setting of the piston guide 12. This makes the manufacturing difficulty of the valve body 11 in this embodiment lower and can improve the processing efficiency of the valve body 11.

[0039] In this embodiment, the piston guide 12 is cylindrical, formed by stamping or stretching stainless steel, and its inner circular surface is formed by machining. The piston guide 12 is at least partially located above the main valve port 112, and is fixedly connected to the valve body 11. Figure 2 and Figure 4 As shown, the valve body 11 includes a stepped portion 115, with the stepped surface of the stepped portion 115 facing the end cap 13. The piston guide 12 is placed on the stepped portion 115. In this embodiment, the piston guide 12 is specifically welded to the valve body 11. The stepped portion 115 can position the piston guide 12, making it easier to connect the piston guide 12 to the valve body 11, thereby improving the processing efficiency of the valve body component 1.

[0040] In this embodiment, the end cap 13 includes a first cylindrical portion 132, located radially to the piston guide 12. The first cylindrical portion 132 is situated outside the piston guide 12. A first annular cavity 133 is located between the piston guide 12 and the first cylindrical portion 132. The first annular cavity 133 is connected to the pilot cavity 103 via a flow channel 113, and also connects to the pilot valve cavity 102. Meanwhile, as... Figure 2-3 As shown, the flow area of ​​the first annular cavity 133 is larger than that of the flow channel 113. The first annular cavity 133 provides sufficient refrigerant flow space between the piston guide 12 and the first cylindrical part 132, and makes the refrigerant flow more rapid when the valve is opened and closed, so as to ensure the operating performance of the solenoid valve.

[0041] In this embodiment, the valve body component 1 includes a piston conduit 12A, which serves as the piston guide 12. The piston conduit 12A is formed by stamping stainless steel sheet, or the piston conduit 12A is made of stainless steel tubing, preferably stainless steel tubing. It should also be noted that, as... Figure 2-3 The piston conduit 12A shown is cylindrical, with a simple structure and easy processing, which can effectively reduce the manufacturing difficulty of the solenoid valve.

[0042] The end cap 13 is cup-shaped and includes a cover portion 131 and the aforementioned first cylindrical portion 132. In the longitudinal direction of the solenoid valve, the first cylindrical portion 132 extends from the cover portion 131 toward the main valve port portion 112.

[0043] In this embodiment, the valve body component 1 further includes a connector 14, which is preferably made of stainless steel. The connector 14 includes a base portion 141 and a second cylindrical portion 142. The second cylindrical portion 142 extends from the base portion 141 toward the side near the end cap 13. A second annular cavity 143 is included between the piston guide 12A and the second cylindrical portion 142. The first annular cavity 133 communicates with the second annular cavity 143. The base portion 141 is fixedly connected to the valve body 11, specifically by welding in this embodiment. The second cylindrical portion 142 is fixedly connected to the first cylindrical portion 132, specifically by welding in this embodiment. The above content has the following beneficial effects: On the one hand, during the processing of the stainless steel valve body 11, the connector 14 and the valve body 11 are processed separately, which can reduce the processing difficulty of the connector 14 and the valve body 11. After processing, the connector 14 is welded to the valve body 11. The size of the valve body 11 can be reduced by the connector 14, making it easier to process and shape the valve body 11. On the other hand, as Figure 2-4 As shown, the flow area of ​​the second annular cavity 143 is the same as or approximately the same as the flow area of ​​the first annular cavity 133. That is, the flow area of ​​the second annular cavity 143 is larger than the flow area of ​​the flow channel 113. The second annular cavity 143 can provide a larger refrigerant flow space, which makes the refrigerant flow more rapidly when the valve is opened and closed, thereby effectively ensuring the operating performance of the solenoid valve.

[0044] The first cylindrical portion 132 has a first step at its end facing the connector 14, and the second cylindrical portion 142 has a second step at its end facing the end cap 13. The first and second steps cooperate with each other to enable quick positioning when the end cap 13 is connected to the connector 14, thereby improving the connection efficiency between the end cap 13 and the connector 14. Meanwhile, the base portion 141 has an inner ring wall near the piston 21, which is welded and fixed to the outer surface of the piston guide tube 12A. Based on this, the piston guide tube 12A is connected and fixed to the valve body 11 and the connector 14, ensuring the stability of the piston guide tube 12A.

[0045] In this embodiment, the base portion 141 includes a first hole portion 140, the valve body 11 includes a second hole portion 110, and the valve body component 1 further includes a flow guide 15. The flow guide 15 is located on the outside of the valve body 11. One end of the flow guide 15 is connected to the first hole portion 140, and the other end of the flow guide 15 is connected to the second hole portion 110. The flow guide 15 has a flow guide hole 151, which connects to the flow channel 113 and the valve chamber 102. The flow guide 15 is preferably made of stainless steel and has a tubular structure. It is understood that, unlike... Figure 1 The background art shows a cross-sectional schematic diagram of a solenoid valve, in which a flow guide hole is directly machined inside the valve body. In this embodiment, the medium flowing through the solenoid valve is guided by the flow guide 15. Based on this, the valve body 11 and the flow guide 15 are separate structures, and are welded and fixed after processing. The flow guide 15 can reduce the thickness required for forming the valve body 11, and at the same time, it can make the processing and forming of the valve body 11 more convenient.

[0046] In this embodiment, the valve body component 1 further includes a valve port seat 16, which is cylindrical and fixedly connected to the valve body 11. The valve port seat 16 includes a support portion 162, which includes the aforementioned main valve port portion 112. The valve body component 1 includes a pressure relief channel located between the main valve port portion 112 and the outlet pipe 19, and the pressure relief channel can connect the pilot valve chamber 102 and the outlet end 116. It should also be noted that the higher the height of the main valve port portion 112 in the longitudinal direction of the solenoid valve, the larger the longitudinal dimension of the support portion 162 in the longitudinal direction of the solenoid valve. Based on this, compared with the piston in the prior art, the piston 21 of this application can be smaller, which can not only reduce the cost of the piston 21, but also reduce the overall weight of the solenoid valve, making the solenoid valve lightweight.

[0047] The pressure relief flow channel includes at least a portion of the pilot valve port 114, which communicates with the pilot valve cavity 102. The valve seat 16 also includes a base 161, which protrudes from the support portion 162 in a direction away from the piston component 2. The base 161 is welded and fixed to the outlet end 116. The base 161 includes a side hole 1611, and the pressure relief flow channel also includes at least a portion of the side hole 1611, which communicates with the inner cavity of the pilot valve port 114 and the valve seat 16. When the valve seat 16 is installed to the outlet end 116, the base 161 provides guidance for the valve seat 16, enabling the valve seat 16 to be quickly installed and positioned, while ensuring the connection strength between the valve seat 16 and the valve body 11.

[0048] To further ensure the connection strength between the valve seat 16 and the valve body 11, such as Figure 2From this perspective, the bottom of the base 161 is close to the outlet pipe 19. Specifically, the base 161 includes a side hole 1611, and the pressure relief flow channel also includes at least a portion of the side hole 1611. The side hole 1611 connects the inner cavity of the pilot valve port 114 and the valve seat 16. When the solenoid valve is open, the medium is guided from the pilot valve port 114 to the outlet pipe 19 through the side hole 1611. The inner diameter of the side hole 1611 is greater than or equal to the inner diameter of the pilot valve port 114, thereby preventing the side hole 1611 from throttling the medium discharged from the pilot valve port 114. Of course, the structure of the connecting channel is not limited to this. For example, the base 161 may not need to include the aforementioned side hole 1611. Specifically, there is a pressure relief gap between the lower end of the base 161 and the upper end of the outlet pipe 19, and the outlet pipe 19 is connected to the pilot valve port 111 through this pressure relief gap.

[0049] Among them, in such Figure 2-3 As shown, a welding ring placement area is provided between the outlet pipe 19 and the valve seat 16. The welding ring placement area is located between the lower end of the valve seat 16 and the upper end of the outlet pipe 19. By placing a welding ring in the welding ring placement area, during furnace welding, the welding ring can weld the outlet pipe 19 and the valve seat 16 together to the valve body 11 through capillary action. Of course, the way the outlet pipe 19 and the valve seat 16 are fixed to the valve body 11 is not limited to this. The outlet pipe 19 and the valve seat 16 can also be an integral structure, for example, made from a single stainless steel pipe.

[0050] Meanwhile, to ensure that the main valve port 112 can effectively abut against the sealing ring at the bottom of the piston 21, the cross-section of the valve port seat 16 in the longitudinal direction of the solenoid valve can be as follows: Figure 9 As shown, a bend is included between the base 161 and the support 162. Through this bend, the outer diameter of the support 162 is smaller than the outer diameter of the base 161, thereby allowing the main valve port 112 to fit the sealing ring and preventing the sealing performance from being compromised when the solenoid valve is closed. Of course, provided the sealing performance is guaranteed, the valve port seat 16 can also be a cylinder with the same outer diameter for both the base 161 and the support 162. This also facilitates control of the diameter of the main valve port 112.

[0051] In this embodiment, the outer peripheral surface 213 of the piston 21 includes a first mating portion 2131, a transition portion 2132, and a second mating portion 2133. The first mating portion 2131 and the second mating portion 2133 are slidably fitted with the piston guide 12. The outer diameter of the transition portion 2132 is smaller than the outer diameters of the first mating portion 2131 and the second mating portion 2133, and the transition portion 2132 is located between the first mating portion 2131 and the second mating portion 2133. The piston component 2 also includes a piston ring 22. The transition portion 2132 has an annular groove 2134, and part of the piston ring 22 is located in the annular groove 2134. The outer annular surface of the piston ring 22 abuts against the piston guide 12. It should be noted that, as Figure 5As shown, there is a gap between the lower sidewall of the annular groove 2134 and the second mating part 2133, and there is also a gap between the upper sidewall of the annular groove 2134 and the first mating part 2131. When the piston 21 slides, the first mating part 2131 and the second mating part 2133 ensure the stability of the piston 21's movement. The first mating part 2131 and the second mating part 2133 are clearance-fitted with the inner circular surface of the piston guide 12. The transition part 2132 and the inner circular surface of the piston guide 12 include a reserved space 24. This reserved space 24 can prevent impurities from staying at the first mating part 2131 and the second mating part 2133, which could cause the piston 21 to jam or even become stuck, thus improving the piston 21's movement performance.

[0052] It should be noted that when this solenoid valve is in the closed state (in conjunction with...) Figure 2 (For explanation), the inlet end 111 of the solenoid valve is the high-pressure refrigerant region. The high-pressure refrigerant reaches the cavity 210 through the balance hole 211 of the piston 21. The sum of the refrigerant pressure on the upper part of the piston 21 and the pressure applied by the first elastic element 23 is greater than the refrigerant pressure on the lower part of the piston 21, keeping the piston 21 in contact with the main valve port 112. That is, the main valve port 112 is closed, and the flow path between the inlet pipe 18 and the outlet pipe 19 is disconnected. Please refer to... Figure 3 When the coil (not shown in the figure) is energized, the core iron 31 moves towards the end cap 32 under the action of electromagnetic force, and the steel ball 33 no longer abuts against the pilot valve port 114, causing the pilot valve port 114 to open. The pilot valve chamber 102 is connected to the outlet end 116, so that the solenoid valve is switched from the closed state to the open state. Therefore, the high-pressure refrigerant above the piston 21 flows to the outlet pipe 19 through the pilot valve port 114. 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 member 23 is less than the refrigerant pressure on the lower part of the piston 21. Under the action of the pressure difference force, the piston 21 slides in the piston guide member 12 to open the main valve port 112, and the solenoid valve opens, so that the inlet pipe 18 and the outlet pipe 19 are connected through the main valve port 112.

[0053] Figure 10 A cross-sectional schematic diagram of another solenoid valve provided by the present invention in the closed state; Figure 11 for Figure 10 Enlarged diagram of point C in the middle.

[0054] As an example, unlike the examples above, the piston guide 12 is the connector 14A in this example, but the structure and function of the connector 14A are different from those in the previous examples. Specifically, the piston guide 12 includes a cylindrical part 14A1 and a connecting part 14A2. The cylindrical part 14A1 slides with the piston component 2 and is welded to the valve body 11. In this example, the end cap 13A is plate-shaped, and the connecting part 14A2 is welded to the end cap 13A. The connector 14A in this example is made of stainless steel, and during connection, it only needs to be welded to the valve body 11 and the end cap 13A. Similarly, the connector 14A in this example is not only easy to process and form, but also ensures the dimensional accuracy of the mating parts between the cylindrical part 14A1 and the piston component 2, thereby improving the processing efficiency of the solenoid valve compared to... Figure 2 The solenoid valve in the illustrated embodiment reduces the number of parts.

[0055] In this embodiment, the connecting portion 14A2 includes a radially protruding portion 14A21 and an axially protruding portion 14A22. Radially, the radially protruding portion 14A21 bends away from the cylindrical portion 14A1 in a direction away from the cylindrical portion 14A1, and the axially protruding portion 14A22 bends from the radially protruding portion 14A21 towards the end cap 13A. The axially protruding portion 14A22 is fixedly connected to the end cap 13A. The end cap 13A is plate-shaped, and the end cap 13A... Figure 11 The lower end face has a third step at its edge when viewed from a certain angle. Correspondingly, the end of the axial protrusion 14A22 facing the end cap 13A has a fourth step. The third step and the fourth step cooperate with each other so that the end cap 13A can be quickly positioned when connected to the connector 14A, thereby improving the connection efficiency between the end cap 13A and the connector 14A.

[0056] In this embodiment, the radial protrusion 14A21 includes a first hole 140, the valve body 11 includes a second hole 110, and the valve body component 1 further includes a flow guide 15. The flow guide 15 is located radially outside the cylindrical portion 14A1. One end of the flow guide 15 is connected to the first hole 140, and the other end of the flow guide 15 is connected to the second hole 110. The flow guide 15 has a flow guide hole 151, which connects to the flow channel 113 and the valve chamber 102. This flow guide 15 has the same function as the flow guide 15 in the above example, and will not be described in detail here.

[0057] 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.

[0058] 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 without departing from the concept of the present invention, and these modifications all fall within the scope of protection of the present invention.

Claims

1. A solenoid valve, characterized in that, The valve includes a valve body component (1) and a piston component (2). The valve body component (1) includes a valve body (11) and a piston guide (12). The valve body (11) is made of stainless steel. The piston guide (12) is fixedly connected or limitedly connected to the valve body (11). The piston guide is slidably engaged with the piston component (2). The valve body component (1) includes a main valve port (112). The piston component (2) is capable of abutting against the main valve port (112). The valve chamber of the solenoid valve includes a pilot chamber (103). In the axial direction of the piston guide (12), the pilot chamber (103) is located on the side of the piston component (2) away from the main valve port (112). The valve body component (1) further includes an end cap (13). In the axial direction of the piston guide (12), the end cap (13) and the piston guide (12) include a flow passage (113), or one of the piston guide (12) and the end cap (13) includes a flow passage (113). The valve body component (1) includes a pilot valve chamber (102). The flow passage (113) connects the pilot chamber (103) and the pilot valve chamber (102). The valve body component (1) includes an inlet end (111) and an outlet end (116). The pilot valve chamber (102) can communicate with the outlet end (116).

2. The solenoid valve according to claim 1, characterized in that, The end cap (13) includes a first cylindrical portion (132) in the radial direction of the piston guide (12). The first cylindrical portion (132) is located radially outside the piston guide (12). A first annular cavity (133) is included between the piston guide (12) and the first cylindrical portion (132). The first annular cavity (133) is connected to the pilot cavity (103) through the flow channel (113). The first annular cavity (133) is also connected to the pilot valve cavity (102).

3. The solenoid valve according to claim 1 or 2, characterized in that, The valve body component (1) includes a piston conduit (12A), which serves as the piston guide (12); The end cap (13) is cup-shaped and includes a cap portion (131) and a first cylindrical portion (132), the first cylindrical portion (132) extending from the cap portion (131) toward the main valve port portion (112).

4. The solenoid valve according to claim 3, characterized in that, The valve body component (1) further includes a connector (14), which includes a base portion (141) and a second cylindrical portion (142). The second cylindrical portion (142) extends from the base portion (141) toward the end cap (13). A second annular cavity (143) is included between the piston guide (12A) and the second cylindrical portion (142). The first annular cavity (133) communicates with the second annular cavity (143). The base portion (141) is fixedly connected to the valve body (11), and the second cylindrical portion (142) is fixedly connected to the first cylindrical portion (132).

5. The solenoid valve according to claim 4, characterized in that, The base portion (141) includes a first hole portion (140), the valve body (11) includes a second hole portion (110), and the valve body component (1) further includes a flow guide (15). The flow guide (15) is located on the outside of the valve body (11). One end of the flow guide (15) is connected to the first hole portion (140), and the other end of the flow guide (15) is connected to the second hole portion (110). The flow guide (15) has a flow guide hole (151), which connects the flow passage (113) and the valve chamber (102).

6. The solenoid valve according to claim 1, characterized in that, The piston guide (12) includes a cylindrical part (14A1) and a connecting part (14A2). The cylindrical part (14A1) is slidably engaged with the piston component (2). The cylindrical part (14A1) is fixedly connected to the valve body (11). The connecting part (14A2) is fixedly connected to the end cap (13A).

7. The solenoid valve according to claim 6, characterized in that, The piston guide (12) is formed by stamping stainless steel sheet, or the piston guide (12) is made of stainless steel tube. The connecting part (14A2) includes a radial protrusion (14A21) and an axial protrusion (14A22). In the radial direction of the cylindrical part (14A1), the radial protrusion (14A21) bends from the cylindrical part (14A1) toward the side away from the cylindrical part (14A1), and the axial protrusion (14A22) bends from the radial protrusion (14A21) toward the end cap (13A). The axial protrusion (14A22) is fixedly connected to the end cap (13).

8. The solenoid valve according to claim 7, characterized in that, The radial protrusion (14A21) includes a first hole (140), the valve body (11) includes a second hole (110), and the valve body component (1) further includes a flow guide (15). The flow guide (15) is located on the outer side of the valve body (11) and the radial outer side of the cylindrical part (14A1). One end of the flow guide (15) is connected to the first hole (140), and the other end of the flow guide (15) is connected to the second hole (110). The flow guide (15) has a flow guide hole (151), which connects the flow passage (113) and the valve chamber (102).

9. The solenoid valve according to any one of claims 1-8, characterized in that, The valve body component (1) further includes a connector (14), which is fixedly connected to the valve body (11) and also fixedly connected to the end cap (13). The end cap (13) includes a cover portion (131), and the cover portion (131) and the piston guide (12) include the flow passage (113), or one of the piston guide (12) and the cover portion (131) includes the flow passage (113).

10. The solenoid valve according to any one of claims 1-9, characterized in that, The valve body (11) includes a stepped portion (115), the stepped surface of the stepped portion (115) faces the end cap (13), the piston guide (12) is placed on the stepped portion (115), and the piston guide (12) is welded and fixed to the valve body (11).

11. The solenoid valve according to any one of claims 1-10, characterized in that, The valve body component (1) further includes a valve port seat (16), which is a stamped part. The valve port seat (16) is fixedly connected to the valve body (11). The valve port seat (16) includes a support part (162), which includes the main valve port part (112). The valve body component (1) includes a pressure relief channel, which can connect the pilot valve chamber (102) and the outlet end (116).

12. The solenoid valve according to claim 11, characterized in that, The valve body (11) includes a pilot valve port (114) which is connected to the pilot valve cavity (102). The pressure relief passage includes at least a portion of the pilot valve port (114). The valve seat (16) also includes a base (161) which protrudes from the support portion (162) in a direction away from the piston component (2). The base (161) is welded and fixed to the outlet end (116). The base (161) includes a side hole (1611). The pressure relief passage also includes at least a portion of the side hole (1611). The side hole (1611) connects the pilot valve port (114) and the inner cavity of the valve seat (16).

13. The solenoid valve according to any one of claims 1-12, characterized in that, The piston component (2) includes a piston (21), the outer peripheral surface (213) of the piston (21) includes a first mating part (2131), a transition part (2132) and a second mating part (2133), the first mating part (2131) and the second mating part (2133) are slidably mated with the piston guide (12), the outer diameter of the transition part (2132) is smaller than the outer diameter of the first mating part (2131) and the second mating part (2133), and the transition part (2132) is located between the first mating part (2131) and the second mating part (2133); the piston component (2) also includes a piston ring (22), the transition part (2132) includes an annular groove (2134), the piston ring (22) is partially located in the annular groove (2134), and the outer annular surface of the piston ring (22) abuts against the piston guide (12).

14. The solenoid valve according to claim 13, characterized in that, The valve body component (1) further includes a flow guide (15) and a valve seat (16). The piston guide (12) is made of stainless steel tubing. The end cap (13), flow guide (15), and valve seat (16) are all made of stainless steel. A first elastic element (23) is included between the piston (21) and the end cap (13). One end of the first elastic element (23) abuts against the piston (21), and the other end of the first elastic element (23) abuts against the end cap (13). The piston (21) further includes a cavity (210), a balance hole (211), and a flow guide (212). The balance hole (211) connects the cavity (210) and the main valve cavity (101) of the valve body (11). The flow passage (113) is located between the end cap (13) and the piston guide (12). When the piston (21) abuts against the end cap (13), the flow guide (212) corresponds to the flow passage (113). The solenoid valve also includes a pilot valve component (3), which includes a core iron component, which includes a core iron (31) and a steel ball (33). The steel ball (33) is connected to the core iron (31). The valve body (11) also includes a pilot valve port (114). When the solenoid valve is closed, the steel ball (33) abuts against the pilot valve port (114).

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