Electromagnetic switching valve

Abstract

The present invention discloses an electromagnetic switching valve, which comprises a valve body, a piston and a connecting rod. The piston comprises a first piston and a second piston. One end of the connecting rod is fixedly connected to the first piston, and the other end of the connecting rod is fixedly connected to the second piston. The piston can slide along the inner wall of the valve body. It is characterized in that the first piston comprises a fixed seat, a tapered plug, a gasket component, a piston bowl, a spring piece and a pressing piece. The fixed seat comprises an opening part, and at least part of the tapered plug extends out of the opening part. The fixed seat, the gasket component, the piston bowl, the spring piece and the pressing piece are connected in a limiting manner. The tapered plug is located on one side of the gasket component, the piston bowl is located on the other side of the gasket component, and the spring piece abuts against the piston bowl.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration control, and particularly to an electromagnetic switching valve. Background Art

[0002] The electromagnetic switching valve is applied to a refrigeration system and can be used to switch the direction of refrigerant flow or control the on-off of the refrigerant flow path. Taking the four-way reversing valve as an example, it includes a pilot valve, an electromagnetic coil, and a main valve. By energizing and de-energizing the electromagnetic coil, the core iron and the sliding bowl in the pilot valve change the connection mode of the capillary tube, forming a pressure difference between the left and right chambers of the main valve, thereby pushing the piston and the slider to move, so that the refrigerant flow path located on the valve seat is conducted or blocked, thus achieving the purpose of flow path switching. Among them, under the working state of high temperature and high pressure, especially in a high-pressure refrigerant system such as a carbon dioxide refrigerant system, higher requirements are imposed on the piston, and it is necessary to reduce the possibility of the piston deforming and causing the switching valve to fail. Summary of the Invention

[0003] The object of the present invention is to provide an electromagnetic switching valve that can be applied to high-temperature and high-pressure refrigerants. To this end, the present invention adopts the following technical solutions:

[0004] An electromagnetic switching valve, characterized in that it includes a valve body, a piston, and a connecting rod. The piston includes a first piston and a second piston. The first piston is fixedly connected to one end of the connecting rod, and the second piston is fixedly connected to the other end of the connecting rod. The piston can slide along the inner wall of the valve body. It is characterized in that the first piston includes a fixed seat, a tapered plug, a gasket component, a piston bowl, a spring piece, and a pressing piece. The fixed seat includes an opening. At least part of the tapered plug extends out of the opening. The fixed seat, the gasket component, the piston bowl, the spring piece, and the pressing piece are connected in a limiting manner. The tapered plug is located on one side of the gasket component, the piston bowl is located on the other side of the gasket component, and the spring piece abuts against the piston bowl.

[0005] When the electromagnetic switching valve provided by the present invention is applied to a high-temperature and high-pressure environment, the gasket component is a pressure-bearing part, which can resist high temperature and high pressure and is not easily deformed. The piston bowl will not be directly pressed and deformed, thereby improving the impact resistance and high-pressure resistance of the electromagnetic switching valve product. Brief Description of the Drawings

[0006] Figure 1 Schematic diagram of a refrigeration system in a refrigeration state according to an embodiment of the present invention;

[0007] Figure 2 Schematic diagram of a refrigeration system in a heating state according to an embodiment of the present invention;

[0008] Figure 3 Cross-sectional view of a piston structure provided by an embodiment;

[0009] Figure 4 Top view of the piston structure provided for one embodiment;

[0010] Figure 5 Cross-sectional view of the piston structure provided for another embodiment;

[0011] Figure 6 Cross-sectional view of the electromagnetic switching valve provided for another embodiment. Detailed implementation manners

[0012] In order to enable those skilled in the art to better understand the technical solution of the present invention, the following further detailed description is made in conjunction with the accompanying drawings and specific implementation manners.

[0013] It should be noted that, taking an electromagnetic switching valve as an example in this embodiment, it is mainly to enable those skilled in the art to understand the main working principle of the refrigeration system and the role played by the piston in the electromagnetic switching valve. In fact, the piston provided in this embodiment can be applied to any similar valve, that is, a refrigeration electromagnetic switching valve that uses the piston to move in the main valve cavity to change the on-off state of one or more flow paths can use the piston structure provided in this embodiment. Therefore, this embodiment mainly describes the piston structure, and no restrictions are imposed on other specific structures of the electromagnetic switching valve.

[0014] Please refer to Figure 1 , Figure 1 is a schematic diagram of a refrigeration system in an embodiment. Among them, a cross-sectional view of the main valve and the pilot valve of the electromagnetic switching valve is shown, and the capillary tube connecting the main valve and the pilot valve is shown in a schematic manner to facilitate understanding of the flow direction of the refrigerant during the switching process. That is, in an actual product, the main valve and the pilot valve can be connected together through components such as a connecting frame. For example, a connecting frame can be fixedly arranged on the outer periphery of the valve body of the main valve, a bracket can be fixedly arranged on the outer periphery of the valve body of the pilot valve, and then the connecting frame and the bracket can be fixedly connected by screws or welding to make the main valve and the pilot valve an integral body.

[0015] The electromagnetic switching valve includes a main valve 1, a pilot valve 2, and an electromagnetic coil 3, wherein the electromagnetic coil 3 can be fixedly connected to the pilot valve 2 through a screw 4.

[0016] As a specific implementation manner, the pilot valve 2 includes a pilot valve body 21 and a sleeve portion 22 fixedly connected to the pilot valve body 21. One end of the sleeve portion 22 is fixedly connected to the pilot valve body 21, and the other end is fixedly connected with a stationary iron core 23. The pilot valve body 21 is provided with a pilot valve seat 24, and is provided with a second pilot valve interface 212, a third pilot valve interface 213, and a fourth pilot valve interface 214. On the side opposite to the pilot valve seat 24, a first pilot valve interface 211 is provided. The first pilot valve interface 211 is fixedly connected with a first capillary d, the second pilot valve interface 212 is fixedly connected with a second capillary e, the third pilot valve interface 213 is fixedly connected with a third capillary s, and the fourth pilot valve interface 214 is fixedly connected with a fourth capillary c. In this way, the pilot valve body 21, the pilot valve seat 24, the sleeve portion 22, and the stationary iron core 23 define a pilot valve cavity. A moving iron core 28 that can reciprocate along its inner cavity is arranged in the pilot valve cavity. The moving iron core 28 is provided with a hole portion at one end close to the stationary iron core 23, and a return spring 29 is arranged. One end of the return spring 29 abuts against the stationary iron core 23. The other end of the moving iron core 28 is fixedly connected with a drag frame 25. The drag frame 25 is provided with a receiving hole, and a sliding bowl 26 is arranged at the receiving hole. A certain force is applied to the sliding bowl 26 through a reed 27 to make the sliding bowl 26 fit with the upper end surface of the pilot valve seat 24. The sliding bowl 26 has an inverted bowl-shaped structure, and the space inside it can selectively conduct the second capillary e and the third capillary s, or conduct the third capillary s and the fourth capillary c.

[0017] An electromagnetic coil 3 is sleeved outside the sleeve portion 22 and is fixedly connected to the stationary iron core 23 through a screw 4. When the electromagnetic coil is energized, a magnetic field is generated, causing the moving iron core 28 to be attracted to the stationary iron core 23, so that the sliding bowl 26 is driven to move to the right through the drag frame 25. When the electromagnetic coil is de-energized, the electromagnetic force disappears, and under the elastic force of the return spring 29, the moving iron core 28 separates from the stationary iron core 23, driving the sliding bowl 26 to move to the left through the drag frame 25.

[0018] The main valve 1 includes a valve body 11. The inner cavity of the valve body 11 is generally cylindrical, and an end cover 12 is fixed at each of its two ends. The valve body 11 is respectively provided with a first interface 111, a second interface 112, a third interface 113, and a fourth interface 114 on its peripheral wall. Among them, the first interface 111 is located on one side, and the second interface 112, the third interface 113, and the fourth interface 114 are located on the side opposite to the first interface 111 and are arranged in sequence. And, on one side of the first interface, a valve seat 13 is fixedly connected. The upper end face of the valve seat 13 is sequentially provided with 3 openings, which are respectively corresponding to the second interface 112, the third interface 113, and the fourth interface 114. The first interface 111 is fixedly connected with a first connecting pipe D, the second interface 112 is fixedly connected with a second connecting pipe E, the third interface 113 is fixedly connected with a third connecting pipe S, and the fourth interface 114 is fixedly connected with a fourth connecting pipe C. When the above-mentioned second connecting pipe E, third connecting pipe S, and fourth connecting pipe C are fixedly connected to the valve body 11, they are also fixedly connected to the valve seat 13, as Figure 1 shown. In this way, the two end covers 12, the main valve 11, and the valve seat 13 roughly define the valve cavity of the main valve.

[0019] Inside the valve cavity, a slider 14 and a piston connecting rod assembly are provided. Among them, the slider 14 is roughly in an inverted bowl-shaped structure, covering the upper end face of the valve seat 13, and can slide on the upper end face of the valve seat 13 under the drive of the piston connecting rod assembly. The inner cavity of the slider can selectively conduct the inner cavities of the second connecting pipe E and the third connecting pipe S, or conduct the inner cavities of the third connecting pipe S and the fourth connecting pipe C. As Figure 1 shown in the state, it is the inner cavities of the second connecting pipe E and the third connecting pipe S that are conducted.

[0020] The piston connecting rod assembly includes a connecting rod 15 and a piston 16. Among them, the piston 16 includes a first piston 161 and a second piston 162. Both the first piston 161 and the second piston 162 are fixedly connected to the connecting rod 15. Specifically, it can be achieved by means of screw connection. The connecting rod 15 has an embedding part and is fitted with the slider 14, so as to realize the linkage between the piston connecting rod assembly and the slider 14. When the piston connecting rod assembly drives the slider to move together, the contact part between the slider 14 and the valve seat forms a pair of kinematic pairs, and the first piston 161 and the second piston 162 and the inner wall of the valve body 11 form a pair of kinematic pairs. The piston 16 roughly divides the valve cavity of the main valve into a left chamber 11a, a middle chamber 11b, and a right chamber 11c that are not connected to each other. When the piston 16 moves, it can change the sizes of the left chamber 11a and the right chamber 11c.

[0021] The first capillary d is fixedly connected to the first connecting pipe D of the main valve. In this way, the refrigerant in the pilot valve cavity is communicated with the middle chamber 11b of the main valve through the first capillary d. The second capillary e is fixedly connected to and conducts with the end cover 12 on the left side of the main valve. The third capillary s is fixedly connected to and conducts with the third connecting pipe S of the main valve. The fourth capillary c is fixedly connected to and conducts with the end cover 12 on the right side of the main valve.

[0022] As a specific implementation manner of a refrigeration system, the first connecting pipe D of the electromagnetic switching valve main valve 1 is connected to the exhaust port of the compressor 100, and the third connecting pipe S is connected to the suction port of the compressor 100. The second connecting pipe E is connected to the outdoor heat exchanger 300, and the fourth connecting pipe C is connected to the indoor heat exchanger 200. A throttling element 400 is further arranged between the outdoor heat exchanger 300 and the indoor heat exchanger 200, and the throttling element 400 can be a capillary or an electronic expansion valve, etc.

[0023] Since the first connecting pipe D is connected to the exhaust port of the compressor 100, the middle chamber 11b in the main valve that is communicated with the internal space of the first connecting pipe D is a high-pressure area. The D connecting pipe is further communicated with the pilot valve cavity through the first capillary d, so the pilot valve cavity is also a high-pressure area. When the refrigeration system needs to refrigerate, the electromagnetic coil 3 is de-energized. The moving iron core 28 in the pilot valve moves to the left side of the pilot valve seat 24 under the action of the return spring 29, and the sliding bowl 26 conducts the internal spaces of the second capillary e and the third capillary s. The fourth capillary c is not covered by the sliding bowl 26, so it is communicated with the internal space of the first capillary d, that is, through the fourth capillary c, the pilot valve cavity is communicated with the right chamber 11c of the main valve. At this time, the right chamber is a high-pressure area. The left chamber is a low-pressure area. In this way, a pressure difference is generated between the left chamber 11a and the right chamber 11c of the main valve 1. Under the action of the pressure difference force, the piston 16 is pushed to move to the left side, and the internal spaces of the second connecting pipe E and the third connecting pipe S of the main valve are conducted, so that the fourth connecting pipe C of the main valve is communicated with the middle valve cavity 11b of the main valve. At this time, the refrigerant flow path is: compressor exhaust port → first connecting pipe D → middle valve cavity 11b → fourth connecting pipe C → outdoor heat exchanger 300 → throttling element 400 → indoor heat exchanger 200 → second connecting pipe E → inner cavity of the slider 14 → third connecting pipe S → compressor suction port, and the refrigeration system is in the refrigeration working state, as Figure 1 shown.

[0024] When the refrigeration system needs to heat, the electromagnetic coil 3 is energized to generate an electromagnetic force. The moving iron core 28 in the pilot valve moves the sliding bowl 26 to the left side of the pilot valve seat 24 by overcoming the acting force of the return spring 29 under the action of the electromagnetic force. The sliding bowl 26 conducts the internal spaces of the third capillary s and the fourth capillary c. The second capillary e is not covered by the sliding bowl 26, so it is conducted with the internal space of the first capillary d. That is, through the second capillary e, the pilot valve cavity is conducted with the left chamber 11a of the main valve. At this time, the left chamber is a high-pressure area. The right chamber is a low-pressure area. In this way, a pressure difference is generated between the left chamber 11a and the right chamber 11c of the main valve 1. Under the action of the pressure difference force, the piston 16 is pushed to move to the right side, and the internal spaces of the third connection pipe S and the fourth connection pipe C of the main valve are conducted, so that the second connection pipe E of the main valve is conducted with the middle valve cavity 11b of the main valve. At this time, the refrigerant flow path is: compressor exhaust port → first connection pipe D → middle valve cavity 11b → second connection pipe E → indoor heat exchanger 200 → throttling element 400 → outdoor heat exchanger 300 → fourth connection pipe C → inner cavity of the slider 14 → third connection pipe S → compressor suction port. The refrigeration system is in the heating working state, as Figure 2 shown.

[0025] Taking the first piston 161 as an example, the piston component structure of this embodiment will be described in detail. Please refer to Figure 3 、 Figure 4 , Figure 3 is the cross-sectional view of the piston structure provided by this embodiment, Figure 4 is the top view of the piston structure provided by this embodiment. It should be noted that the piston / first piston / second piston described in the specification of the present invention all refer to the general term of the piston bowl that can slide along the inner wall of the main valve body to change the sizes of the chambers of the main valve and the components fixed or limited to the piston bowl as a whole. Taking the first piston 161 as an example, the first piston 161 includes a fixed seat 1611, a tapered plug 1612, a gasket component 1613, a piston bowl 1614, a pressing piece 1615, and a spring piece 1616. Among them, the fixed seat 1611 includes a bottom wall portion 16111, a side wall portion 16112, and a top wall portion 16113. Taking Figure 3 shown as a reference, the side wall portion of the fixed seat protrudes upward as a whole relative to the bottom wall. The fixed seat 1611 can be formed by stamping a metal plate, and an opening 16114 is formed in the middle of the top wall portion 16113 to form a through tapered plug channel in the top wall portion 16113.

[0026] The tapered plug 1612 includes a body portion 16121 and an abutting portion 16122. A sealing portion is provided at the end of the body portion 16121 for abutting against the end cover of the main valve to achieve sealing. The outer diameter of the body portion 16121 is smaller than that of the abutting portion 16122. In this way, a step is formed between the body portion and the abutting portion. The tapered plug spring 1618 is sleeved on the outside of at least part of the body portion 16121, with one end abutting against a part of the abutting portion 16122 near the step and the other end abutting against the top wall portion 16113 of the fixed seat. Of course, as an equivalent variation of the implementation manner, it can also be set that the tapered plug spring indirectly abuts against the top wall portion through components such as gaskets, and the tapered plug spring indirectly abuts against the abutting portion through components such as gaskets. After the piston component is assembled, at least part of the tapered plug 1612 extends out from the tapered plug channel formed by the opening portion 16114, and the sealing portion is located at the relatively outer part of the fixed seat.

[0027] The bottom wall portion 16111 of the fixed seat abuts against one side of the gasket component 1613. In this embodiment, the gasket component 1613 includes a first gasket 16131 and a second gasket 16132. Both the first gasket and the second gasket can be made of metal material and are generally plate-shaped. Among them, Figure 3 Taking the shown as a reference, the second gasket is located at the upper end of the first gasket and the two are arranged in a fitting manner. A through hole is provided in the middle of the second gasket 16132. In this way, when the first gasket abuts against the second gasket, the through hole forms a receiving cavity of the gasket component 1613. The abutting portion of the tapered plug 1612 passes through the through hole of the second gasket and abuts against the first gasket, that is, at least part of the abutting portion is located in the receiving cavity.

[0028] On the relatively other side of the gasket component 1613, a piston bowl 1614 is provided. The piston bowl 1614 is made of a flexible material and has a piston bowl body portion 16141 and a piston bowl fitting portion 16142. Among them, one side of the piston bowl body portion 16141 abuts against the gasket component 1613, and the other side abuts against the spring piece 1616. The piston bowl fitting portion 16142 extends circumferentially along the edge portion of the piston bowl body portion. After the electromagnetic switching valve is assembled, the piston bowl fitting portion 16142 can slide along the inner wall of the main valve body and divide the inner cavity of the valve body into a left chamber, a middle chamber and a right chamber.

[0029] The spring piece 1616 has a shape generally matching that of the piston bowl 1614, and a plurality of pressing portions 16161 capable of elastic deformation are formed at the outer edge portion. The pressing portions 16161 can generate a certain elastic force on the piston bowl fitting portion 16142 and ensure that the piston bowl fitting portion 16142 does not undergo excessive deformation due to excessive pressure on the other side, resulting in the corresponding chamber of the main valve being conducted. The pressing piece 1615 is generally plate-shaped, and one side of it abuts against the spring piece 1616.

[0030] The fixing seat 1611, the first gasket 16131, the second gasket 16132, the piston bowl 1614, the spring piece 1616, and the pressing piece 1615 are all provided with through mounting holes. In this embodiment, the number of mounting holes is 2. After the above components are sequentially abutted, the mounting holes have the same axis in the axial direction. In other words, the mounting holes of the above components are coaxially arranged. The connecting piece 1617 sequentially passes through the above mounting holes and limits and connects the fixing seat, the first gasket, the second gasket, the piston bowl, the spring piece, and the pressing piece. Specifically, as Figure 3 shown, the connecting piece 1617 has a first large-diameter portion 16171, a main body portion 16172, and a second large-diameter portion 16173. Among them, the size of the main body portion 16172 matches the size of the mounting hole, and the outer diameter of the first large-diameter portion 16171 is larger than the inner diameter of the mounting hole. After the connecting piece is assembled, the end of the main body portion away from the first large-diameter portion is riveted to form the second large-diameter portion 16173. In this way, the above components are limited and connected into a complete first piston 161 through the connecting piece.

[0031] Since the first gasket 16131 is made of a metal plate, the abutting portion 16122 of the tapered plug 1612 abuts against one surface of the first gasket 16131. When the electromagnetic switching valve is used in a high-temperature and high-pressure system, after the tapered plug contacts and seals with the end cover, it abuts against the first gasket under force. At this time, the first gasket is a pressure-bearing part, which can resist high temperature and high pressure and is not easily deformed, and the piston bowl will not be directly compressed and deformed, thereby improving the impact and high-pressure resistance performance of the electromagnetic switching valve product.

[0032] The following combines Figure 5 , to illustrate the structure of another embodiment. Figure 5 It is a cross-sectional view of the piston structure provided for another embodiment.

[0033] In order to avoid the description in the specification from being too lengthy, in the description of this embodiment, for components with the same reference numerals, the description of other embodiments in the above text can be referred to, and details will not be elaborated here. Only the differences will be described.

[0034] In this embodiment, the gasket component 2613 of the first piston 161 is integrally formed of a metal material, and a concave portion is provided at a relative central portion of the gasket portion 2613. The concave portion is recessed toward the inside of the gasket component, thereby forming a receiving cavity. The gasket component 2613 is generally plate-shaped. During assembly, the abutting portion 16122 of the tapered plug 1612 can be first placed in the receiving cavity, such that at least a part of the abutting portion is located in the receiving cavity. Then, a tapered plug spring 1618 is sleeved on the outer edge of the tapered plug 1612, and the fixed seat 1611 is placed into the top of the tapered plug 1612, such that one end of the tapered plug spring 1618 abuts against the upper side of the abutting portion 16122, and the other end of the tapered plug spring 1618 abuts against the top wall portion 16113 of the fixed seat. At least a part of the tapered plug 1612 extends out from the tapered plug passage formed by the opening 16114 of the fixed seat, and the sealing portion is located at the relative outside of the fixed seat.

[0035] The other side of the gasket component 2613 abuts against the piston bowl 1614, the other side of the piston bowl 1614 abuts against the spring piece 1616, and a pressing piece 1615 is provided on the lower side of the spring piece 1616. The fixed seat 1611, the gasket component 2613, the piston bowl 1614, the spring piece 1616, and the pressing piece 1615 are all provided with at least one through mounting hole. In this embodiment, the number of mounting holes is two. As Figure 5 shown, after the above components abut against each other in sequence from top to bottom, the mounting holes are coaxially arranged in the axial direction. The connecting member 1617 sequentially passes through the above mounting holes, and limits and connects the fixed seat, the gasket component, the piston bowl, the spring piece, and the pressing piece. The specific structure and the limiting method of the connecting member 1617 can refer to the description of the first embodiment, and will not be elaborated here.

[0036] The structure of the first piston has been described through the above two embodiments. After the first piston 161 is manufactured, the first piston 161 can be fixedly connected to one end of the connecting rod by means of screw fixation. The above describes the structure taking the first piston 161 as an example. The second piston 162 can adopt the same structure as the first piston 161. Those skilled in the art can also understand the structure of the second piston 162 based on the above disclosure content and fix the second piston 162 to the connecting rod.

[0037] It should be noted that the embodiments of the above pistons 16 (including the first piston 161 and the second piston 162) are not limited to the specific structure of the electromagnetic switching valve described in the first embodiment of the present invention. Those skilled in the art should understand that the combined structure of the connecting rod and the piston is a replaceable whole relative to the main valve body. The piston structure provided in this embodiment can be applied to environments with more severe working conditions such as high pressure and vibration, and naturally can also be applied to environments with more excellent working conditions.

[0038] The following will be combined with Figure 6, it describes the implementation mode of applying the connecting rod piston assembly to an electromagnetic switching valve in a high-pressure vibration environment. This implementation mode aims to illustrate an example of applying the piston connecting rod assembly described in the above two implementation modes to an electromagnetic switching valve in a high-pressure refrigerant system (such as a CO2 system), but is not limited to the specific structure of this electromagnetic switching valve. In the following description, other structural components of the electromagnetic switching valve will be mainly described, and the piston structure will not be described in detail.

[0039] Inside the main valve body 11a, a main valve cavity 111a, a first flow channel 101a, a second flow channel 102a, a third flow channel 103a, and a fourth flow channel 104a are formed; the second flow channel 102a, the third flow channel 103a, and the fourth flow channel 104a are on the same side, while the first flow channel 101a is on the opposite side. The first flow channel 101a can communicate with the high-pressure side in the refrigeration system (i.e., the exhaust port of the compressor), and the third flow channel 103a can communicate with the low-pressure side in the refrigeration system (i.e., the side connected to the suction port of the compressor). In this way, during operation, the refrigerant at the first flow channel 101a always remains at high temperature and high pressure, while the refrigerant at the third flow channel 103a always remains at relatively low temperature and low pressure.

[0040] The main valve cavity 111a is provided with a main valve seat 12a fixedly connected to the main valve body 11a, a slider 13a that can slide on the main valve seat 12a, a connecting rod 14a that drives the slider 13a to move, a first piston 151a fixed at both ends of the connecting rod 14a, and a second piston 152a.

[0041] The first valve assembly 21a includes a first guiding part 2113a, and the second valve assembly 31a includes a second guiding part 3113a. The first guiding part 2113a can be integrally formed or processed from a metal material such as stainless steel, and is provided with a first valve port part 2115a, a first guiding channel 2116a, and a second guiding channel 2117a arranged inside the first guiding part 2113a. The second guiding part 3113a can also be integrally formed or processed from a metal material such as stainless steel, and is provided with a second valve port part 3115a, a third guiding channel 3116a, and a fourth guiding channel 3117a arranged inside the second guiding part 3113a.

[0042] The main valve body 11a is processed by casting or forging using a metal such as stainless steel or aluminum. The main valve body 11 can be an integral structure, and a first main valve diversion channel 112a and a second main valve diversion channel 113a are provided inside it. Both the first main valve diversion channel 112a and the second main valve diversion channel 113a can be formed by combining two or more straight channels formed by drilling or other methods. The main valve body 11a is formed using a metal material and directly forms four flow channels or is processed to form four flow channels, with a higher overall structural strength, capable of resisting vibration, withstanding high pressure, and being more reliable in operation.

[0043] Among them, one end of the first main valve diversion channel 112a is connected to the first diversion channel 2116a on the first diversion part 2113a, and the other end is connected to the third flow channel 103a on the main valve body 11a. Similarly, one end of the second main valve diversion channel 113a is connected to the fourth diversion channel 3117a on the second diversion part 2113a, and the other end is connected to the third flow channel 103a on the main valve body 11a.

[0044] The first diversion part 2113a and the main valve body 11a can be fixed by press-fitting and welding. During manufacturing, first, the first diversion channel 2116a and the second diversion channel 2117a are processed on the first diversion part 2113a, then the first diversion part 2113a is inserted into one end of the main valve body, and one end of the first diversion channel 2116a is aligned and connected with the first main valve diversion channel 112a of the main valve body, and then welding fixation is carried out. Similarly, the second diversion part 3113a and the main valve body 11 can also be fixed by press-fitting and welding. During manufacturing, first, the third diversion channel 3116a and the fourth diversion channel 3117a are processed on the second diversion part 3113a, then the second diversion part 3113a is inserted into the other end of the main valve body, and one end of the fourth diversion channel 3117a is aligned and connected with the second main valve diversion channel 113a of the main valve body, and then welding fixation is carried out.

[0045] Since the first main valve diversion channel 112a and the second main valve diversion channel 113a are provided on the main valve body, directly forming a fluid channel inside the main valve body, making the structure of the entire product more compact and resistant to high temperature and high pressure.

[0046] Both the first piston 151a and the second piston 152a can adopt the same structure as the first piston 161 described in the first embodiment, which will not be elaborated here. This structure of the electromagnetic switching valve can be applied to high-pressure refrigerant systems such as CO2. When the piston component is under pressure, the first gasket made of metal material is the pressure-bearing part, and the piston bowl will not be directly deformed by high pressure. Therefore, the piston assembly can resist high temperature and high pressure, is not easily deformed, and improves the impact resistance and high-pressure resistance of the electromagnetic switching valve product.

[0047] In this specification, the orientation terms "upper", "lower", "left" and "right" are defined based on the illustrations shown in the accompanying drawings of the specification. It is only for the convenience of understanding and expression and should not limit the protection scope of the present application.

[0048] The electromagnetic switching valve provided by the present invention has been introduced in detail above. Specific examples are used herein to illustrate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An electromagnetic switching valve, comprising a valve body, a piston, and a connecting rod. The piston includes a first piston and a second piston. The first piston is fixedly connected to one end of the connecting rod, and the second piston is fixedly connected to the other end of the connecting rod. The piston is capable of sliding along the inner wall of the valve body, characterized in that, The first piston includes a fixed seat, a tapered plug, a gasket component, a piston bowl, a spring plate, and a pressing plate. The fixed seat includes an opening. At least part of the tapered plug extends out of the opening. The fixed seat, the gasket component, the piston bowl, the spring plate, and the pressing plate are connected in a limited way. The tapered plug is located on one side of the gasket component, and the piston bowl is located on the other side of the gasket component. The spring plate abuts against the piston bowl. The tapered plug includes a body portion and an abutting portion. A sealing portion is provided at the end of the body portion. The sealing portion extends out of the opening of the fixed seat. The abutting portion abuts against the gasket. The gasket component includes a receiving cavity. At least part of the abutting portion of the tapered plug is located in the receiving cavity.

2. The electromagnetic switching valve according to claim 1, characterized in that, The fixed seat includes a bottom wall portion that directly or indirectly abuts against the first end face of the gasket component, a peripheral wall portion that extends toward the side away from the gasket component, and a top wall portion. The opening is provided at a relatively central position of the top wall portion, and the opening forms a tapered plug channel that penetrates through the top wall portion.

3. The electromagnetic switching valve according to claim 2, wherein, The outer diameter of the body portion is smaller than the outer diameter of the abutting portion. At least part of the body portion is sleeved with a tapered plug spring. One end of the tapered plug spring directly or indirectly abuts against an abutting surface of the abutting portion, and the other end of the tapered plug spring directly or indirectly abuts against the top wall portion.

4. The electromagnetic switching valve according to claim 1, characterized in that, The gasket component is integrally formed of a metal material. A recessed portion is provided at a relatively central position of the gasket component. The recessed portion faces the tapered plug, and the recessed portion forms the receiving cavity.

5. The electromagnetic switching valve according to claim 1, characterized in that, The gasket component includes a first gasket and a second gasket. The first gasket is in a flat plate shape. One side of the first gasket abuts against the piston bowl, and the other side of the first gasket abuts against one side of the second gasket. The second gasket is located on the opposite side of the first gasket and abuts against the fixed seat. The second gasket is provided with a through hole. The abutting portion of the tapered plug passes through the through hole and abuts against the first gasket. The first gasket is integrally formed of a metal material.

6. The electromagnetic switching valve according to claim 4, characterized in that, The first piston includes a connecting member. The fixed seat, the gasket component, the piston bowl, and the pressing plate are each provided with at least one through mounting hole. The connecting member passes through the mounting holes. The outer diameters of both ends of the connecting member are larger than the mounting holes, and the fixed seat, the gasket component, the piston bowl, the spring plate, and the pressing plate are connected in a limited way.

7. The electromagnetic switching valve according to claim 5, characterized in that, The first piston includes a connecting member. The fixed seat, the first gasket, the second gasket, the piston bowl, and the pressing plate are each provided with at least one through mounting hole. The connecting member passes through the mounting holes. The outer diameters of both ends of the connecting member are larger than the mounting holes, and the fixed seat, the first gasket, the second gasket, the piston bowl, the spring plate, and the pressing plate are connected in a limited way.

8. The electromagnetic switching valve according to claim 1, characterized in that, The second piston has the same structure as the first piston. Both the first piston and the second piston are fixedly connected to the connecting rod by means of screw connection.

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