Bidirectional electromagnetic valve and air conditioning unit

Abstract

The application relates to the refrigeration technical field, in particular to a bidirectional electromagnetic valve and an air conditioning unit. The bidirectional electromagnetic valve comprises a valve body assembly and a valve core assembly, the valve body assembly is provided with a first communication port and a second communication port on two sides respectively, the valve body assembly is provided with a valve cavity, and the valve core assembly is arranged in the valve cavity; the valve cavity is provided with an intermediate end cover, the valve core assembly comprises a piston, the piston is located on the side of the intermediate end cover away from the first communication port or the second communication port, the bidirectional electromagnetic valve comprises a buffer structure, the buffer structure is arranged on the piston and / or the intermediate end cover and located between the intermediate end cover and the piston, and is used for buffering the impact force of the piston and the intermediate end cover. The application has the advantages that the impact force of the piston on the intermediate end cover can be relieved, the firmness of the intermediate end cover is strengthened, and the noise problem caused by the direct contact between the piston and the intermediate end cover can be relieved.

Description

Technical Field

[0001] This invention relates to the field of refrigeration technology, and in particular to a bidirectional solenoid valve and an air conditioning unit. Background Technology

[0002] Two-way solenoid valves are typically installed in air conditioning units to enable bidirectional flow of media.

[0003] In existing two-way solenoid valves, the piston impacts the intermediate end cap during the valve closing process, affecting the stability of the intermediate end cap installation and generating noise. Summary of the Invention

[0004] Based on this, the present invention addresses the above-mentioned technical problems by providing a bidirectional solenoid valve, the technical solution of which is as follows:

[0005] A bidirectional solenoid valve includes a valve body assembly and a valve core assembly. The valve body assembly has a first communication port and a second communication port on its two sides, respectively. The valve body assembly has a valve cavity, and the valve core assembly is disposed in the valve cavity. The valve core assembly is slidable within the valve cavity to connect or disconnect the first communication port and the second communication port. An intermediate end cap is provided in the valve cavity. The valve core assembly includes a piston, which is located on the side of the intermediate end cap away from the first communication port or the second communication port. The bidirectional solenoid valve includes a buffer structure, which is disposed on the piston and / or the intermediate end cap and is located between the intermediate end cap and the piston, for buffering the impact force between the piston and the intermediate end cap.

[0006] This design can reduce the impact force of the piston on the middle end cap, strengthen the stability of the middle end cap, and alleviate the noise problem caused by the direct impact between the piston and the middle end cap.

[0007] In one embodiment, the buffer structure is a buffer pad located on the side of the intermediate end cap facing the piston, and the buffer pad is capable of abutting against the piston.

[0008] This setup results in a simple structure.

[0009] In one embodiment, the piston includes a first baffle disposed near the intermediate end cap. The first baffle has a U-shaped cross-section and is open at one end. The area of ​​the end face of the opening facing the intermediate end cap is smaller than the area of ​​the surface of the buffer pad facing the first baffle.

[0010] This design ensures that the first baffle fully impacts the buffer pad during a collision, further mitigating the impact force and noise issues.

[0011] In one embodiment, the piston has a throttling section on the side near the intermediate end cap to form the buffer structure, the throttling section allowing the medium to flow between the piston and the intermediate end cap; and / or, the intermediate end cap has a throttling section on the side near the piston to form the buffer structure, the throttling section allowing the medium to flow between the piston and the intermediate end cap.

[0012] With this configuration, when the piston is about to strike the middle end cap, the medium forms a flow resistance between the piston and the middle end cap, thereby reducing the impact force of the piston on the middle end cap and reducing noise generation.

[0013] In one embodiment, the throttling part is a throttling orifice, the piston includes a first baffle, the first baffle is disposed near the intermediate end cap, the first baffle has a "U" shaped cross-section and one end is open, the opening is disposed towards the intermediate end cap, the throttling orifice is opened on the side of the first baffle and communicates with the opening; and / or, the intermediate end cap is cylindrical, the throttling orifice is opened on the side of the intermediate end cap and penetrates the surface of the intermediate end cap toward the piston.

[0014] With this configuration, the medium can enter the space between the piston and the intermediate end cap from the side of the first baffle and / or the side of the intermediate end cap, thus creating flow resistance.

[0015] In one embodiment, the throttling part is a throttling groove, which is formed on the surface of the intermediate end cover near the piston and extends through the side of the intermediate end cover; and / or, the piston includes a first baffle disposed near the intermediate end cover, and the throttling groove is formed on the surface of the first baffle near the intermediate end cover and extends through the side of the first baffle.

[0016] With this configuration, the medium can enter from the throttling groove and form a flow barrier between the piston and the middle end cap.

[0017] In one embodiment, the valve core assembly further includes a connecting rod and a slider. The connecting rod connects to the slider, and the slider includes a first part and a second part disposed opposite to each other. The first part and the second part are respectively capable of blocking the first communication port and the second communication port.

[0018] In one embodiment, an elastic member is provided between the first part and the second part, and the two ends of the elastic member abut against the first part and the second part respectively.

[0019] With this configuration, the elastic element can enhance the sealing performance of the first and second parts when sealing the first and second connecting ports.

[0020] In one embodiment, the valve body assembly includes a valve body and a valve seat, the valve seat being fixed to the valve body, and the intermediate end cap being fixed to the valve body.

[0021] This design allows the valve body to be integrated, reducing welding points and the risk of external leakage.

[0022] This invention also provides the following technical solutions:

[0023] An air conditioning unit includes the aforementioned bidirectional solenoid valve.

[0024] Compared with the prior art, the bidirectional solenoid valve provided by the present invention provides a buffer structure between the intermediate end cap and the piston, so that the piston impacts the buffer structure during the valve closing process, thereby reducing the impact force of the piston on the intermediate end cap, improving the firmness of the intermediate end cap installation, and reducing noise. Attached Figure Description

[0025] Figure 1 A cross-sectional view of a bidirectional solenoid valve according to one embodiment of the present invention;

[0026] Figure 2 A cross-sectional view of a two-way solenoid valve according to another embodiment;

[0027] Figure 3 This is a right view of a two-way solenoid valve;

[0028] Figure 4 This is a front view of the cushioning pad in Example 1;

[0029] Figure 5 for Figure 4 Sectional view at point AA;

[0030] Figure 6 This is a front view of the first baffle in Embodiment 2;

[0031] Figure 7 for Figure 6 Sectional view at point BB;

[0032] Figure 8 The three-dimensional form of the first baffle in Embodiment 2 Figure 1 ;

[0033] Figure 9 The three-dimensional form of the first baffle in Embodiment 2 Figure 2 ;

[0034] Figure 10 This is a perspective view of the middle end cap in Embodiment 2;

[0035] Figure 11 This is a left view of the middle end cap in Embodiment 2;

[0036] Figure 12 This is a perspective view of the middle end cap in Embodiment 3;

[0037] Figure 13 This is a left view of the middle end cap in Embodiment 3.

[0038] The symbols in the diagram represent the following meanings:

[0039] 100. Two-way solenoid valve; 10. Valve body assembly; 101. First orifice; 102. Second orifice; 103. First capillary tube; 104. Second capillary tube; 11. Valve chamber; 111. First chamber; 112. Second chamber; 113. Third chamber; 12. First connecting port; 121. First connecting pipe; 13. Second connecting port; 131. Second connecting pipe; 14. First end cap; 15. Second end cap; 16. Intermediate end cap; 161. Anchor. 17. Valve seat; 18. Valve body; 19. Sleeve; 20. Valve core assembly; 21. Connecting rod; 22. Piston; 221. First baffle; 2221. Opening; 222. Second baffle; 223. Intermediate baffle; 23. Slider; 231. First part; 232. Second part; 233. Elastic element; 30. Pilot valve; 40. Buffer structure; 41. Buffer pad; 42. Throttling part; 421. Throttling orifice; 422. Throttling groove. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be noted that when a component is said to be "attached" to another component, it can be directly on the other component or it can be in the middle of another component. When a component is said to be "set" to another component, it can be directly set to the other component or it may also be in the middle of another component. When a component is said to be "fixed" to another component, it can be directly fixed to the other component or it may also be in the middle of another component.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0043] Please refer to the following: Figures 1 to 13 The present invention provides a bidirectional solenoid valve 100 (hereinafter referred to as solenoid valve), which is installed in an air conditioning unit and is used to control the connection or disconnection of pipelines.

[0044] The solenoid valve 100 of this invention can be used in air conditioning units that require bidirectional operation. For example, it can be installed in air conditioning units that need to simultaneously provide both cooling and heating modes, enabling bidirectional flow of the medium without switching pipelines. It should be noted that the medium in this invention refers to refrigerant.

[0045] Please see Figure 1 and Figure 2 The solenoid valve 100 includes a valve body assembly 10 and a valve core assembly 20. The valve body assembly 10 has a valve cavity 11 and a first communication port 12 and a second communication port 13 are provided on the valve body assembly 10. The valve core assembly 20 is disposed in the valve cavity 11 and can slide in the valve cavity 11 to connect or disconnect the first communication port 12 and the second communication port 13.

[0046] The first connecting port 12 is provided with a first connecting pipe 121, and the second connecting port 13 is provided with a second connecting pipe 131. The first connecting pipe 121 and the second connecting pipe 131 are respectively connected to the piping of the air conditioning unit.

[0047] The valve chamber 11 is provided with an intermediate end cap 16. The valve body assembly 10 has a first end cap 14 and a second end cap 15 at both ends. The valve chamber 11 includes a first chamber 111, a second chamber 112, and a third chamber 113. The first end cap 14 and the intermediate end cap 16 cooperate to form the first chamber 111. The valve core assembly 20, the intermediate end cap 16, and the valve body assembly 10 form the second chamber 112. The valve core assembly 20, the valve body assembly 10, and the second end cap 15 form the third chamber 113. The first connecting port 12 and the second connecting port 13 extend into the first chamber 111. When the bidirectional solenoid valve 100 is in the first position, the first connecting port 12 and the second connecting port 13 communicate with the first chamber 111 for the flow of the medium. It should be noted that the first position in this invention refers to the bidirectional solenoid valve 100 being in the open state.

[0048] The intermediate end cap 16 is generally cylindrical. A portion of the intermediate end cap 16 is located in the first cavity 111, and another portion is located in the second cavity 112. The intermediate end cap 16 seals and separates the first cavity 111 from the second cavity 112.

[0049] The intermediate end cap 16 has a mounting hole 161. A portion of the valve core assembly 20 passes through the mounting hole 161, a portion extends toward the direction close to the first end cap 14, and another portion extends toward the direction close to the second end cap 15.

[0050] In one embodiment, please refer to Figure 1The valve body assembly 10 includes a valve seat 17 and a valve body 18. The valve seat 17 is welded and fixed inside the valve body 18. A first connecting port 12 and a second connecting port 13 are formed on the valve body 18 and pass through the valve seat 17. An intermediate end cap 16 is sealed and welded inside the valve body 18. The valve body 18 is an integral piece, which can reduce the risk of external leakage. The valve body 18 and the first end cap 14 are integrally formed, or the valve body 18 and the first end cap 14 are separate pieces and fixed by welding. In this embodiment, both the valve seat 17 and the valve body 18 are made of stainless steel. Of course, the materials of the valve seat 17 and the valve body 18 are not limited to stainless steel.

[0051] In another embodiment, please refer to Figure 2 The valve body assembly 10 includes a valve seat 17 and a sleeve 19. A first connecting port 12 and a second connecting port 13 are formed on the valve seat 17. An intermediate end cap 16 is located at one end of the valve seat 17, and the sleeve 19 is connected to the intermediate end cap 16 and / or the valve seat 17. The sleeve 19 is fixed to the valve seat 17 or the intermediate end cap 16 by welding, or the sleeve 19 is welded to both the intermediate end cap 16 and the valve seat 17. The intermediate end cap 16 and the valve seat 17 may or may not be welded together. The valve seat 17 and the first end cap 14 are integrally formed, or the valve seat 17 and the first end cap 14 are separate and fixed by welding. In this embodiment, the valve seat 17 is made of copper, and the sleeve 19 is made of stainless steel. Of course, the materials of the valve seat 17 and the sleeve 19 are not limited to the materials described above.

[0052] The valve body assembly 10 has a first hole 101 and a second hole 102. The first hole 101 communicates with the second chamber 112, and the second hole 102 communicates with the third chamber 113. A first capillary tube 103 is provided in the first hole 101, and a second capillary tube 104 is provided in the second hole 102. The first capillary tube 103 and the second capillary tube 104 are connected to the pilot valve 30 described below, so as to create a pressure difference on both sides of the valve core assembly 20, thereby pushing the valve core assembly 20 to move.

[0053] Please continue reading Figure 1The valve core assembly 20 includes a connecting rod 21 and a piston 22. The connecting rod 21 passes through the mounting hole 161, and the piston 22 is disposed within the sleeve or valve body 18. The piston 22 can move along the inner wall of the sleeve or valve body 18 in a sealing manner. The piston 22 is located between the second chamber 112 and the third chamber 113, that is, the piston 22 separates the second chamber 112 from the third chamber 113 to prevent media cross-flow. When it is necessary to close the solenoid valve 100, the high-pressure medium enters the third chamber 113 from the second capillary tube 104, and the medium in the second chamber 112 flows out from the first capillary tube 103, thereby pushing the piston 22 to move towards the valve seat 17. When it is necessary to open the solenoid valve 100, the high-pressure medium enters the second chamber 112 from the first capillary tube 103, and the medium in the third chamber 113 flows out from the second capillary tube 104, thereby pushing the piston 22 to move away from the valve seat 17.

[0054] The piston 22 includes a first baffle 221, a second baffle 222 and an intermediate baffle 223. The first baffle 221 and the second baffle 222 are located on both sides of the intermediate baffle 223. The first baffle 221, the intermediate baffle 223 and the second baffle 222 are connected to each other. The first baffle 221 is located near the intermediate end cap 16.

[0055] The first baffle 221 has a "U" shaped cross-section and an opening 2221 at one end, which faces the middle end cover 16. During the valve closing process, the end face of the opening 2221 can abut against the middle end cover 16, thus playing a limiting role.

[0056] The valve core assembly 20 also includes a slider 23, which is connected to the end of the connecting rod 21 away from the piston 22. The slider 23 can block or release the first communication port 12 and the second communication port 13 as the piston 22 moves.

[0057] The slider 23 includes a first part 231 and a second part 232. The first part 231 abuts against the second part 232. The first part 231 is located near the first connecting port 12, and the second part 232 is located near the second connecting port 13. The first part 231 can block the first connecting port 12, and the second part 232 can block the second connecting port 13.

[0058] An elastic member 233 is provided between the first part 231 and the second part 232. One end of the elastic member 233 abuts against the first part 231 and the other end abuts against the second part 232. The elastic member 233 causes the first part 231 and the second part 232 to fit against the end face of the first connecting port 12 and the end face of the second connecting port 13, respectively, so as to enhance the sealing performance of the blockage.

[0059] Please see Figure 3The solenoid valve 100 also includes a pilot valve 30, which is located outside the valve body assembly 10 and connected to the first capillary tube 103 and the second capillary tube 104. By switching the pilot valve 30, the pressure difference on both sides of the piston 22 is controlled, thereby pushing the piston 22.

[0060] The solenoid valve 100 also includes a buffer structure 40, which is disposed on the piston 22 and / or the intermediate end cover 16. The buffer structure 40 is located between the intermediate end cover 16 and the piston 22 and is used to buffer the impact between the piston 22 and the intermediate end cover 16. It can be understood that during the valve closing process, as the piston 22 moves towards the intermediate end cover 16 and impacts the intermediate end cover 16, the buffer structure 40 can buffer the impact, reduce the impact force, enhance the weld strength of the intermediate end cover 16, and prevent noise.

[0061] Example 1

[0062] Please see Figure 4 and Figure 5 The buffer structure 40 is a buffer pad 41, which is located on the side of the intermediate end cap 16 facing the piston 22. During the valve closing process, the piston 22 can impact the buffer pad 41, reducing the impact force between the piston 22 and the intermediate end cap 16 and reducing noise. In this embodiment, a slot (not shown in the figure) is provided on the side of the intermediate end cap 16 facing the piston 22, and the buffer pad 41 is engaged in the slot. In other embodiments, the buffer pad 41 can also be fixed to the intermediate end cap 16 by means of adhesive bonding. The buffer pad 41 is made of plastic material, such as polytetrafluoroethylene (PTFE) or polyvinyl chloride (PVC).

[0063] Preferably, the area of ​​the surface of the buffer pad 41 facing the first baffle 221 is larger than the area of ​​the end face of the opening 2221 facing the middle end cover 16, so that when the piston 22 contacts the middle end cover 16, it can fully abut against the buffer pad 41, further alleviating the impact and noise problems.

[0064] Example 2

[0065] Please see Figures 6 to 11 The structure of Implementation 1 is basically the same as that of Implementation 2, and the similarities will not be repeated. The difference lies in the way the buffer structure 40 is set:

[0066] A throttling section 42 is provided on the side of piston 22 near the intermediate end cap 16 to form a buffer structure 40, and / or a throttling section 42 is provided on the side of intermediate end cap 16 near piston 22 to form a buffer structure 40. The throttling section 42 allows the medium to flow between piston 22 and intermediate end cap 16. It can be understood that with this arrangement, when intermediate end cap 16 and piston 22 are about to collide, the medium flowing between piston 22 and intermediate end cap 16 can form a flow resistance, preventing direct impact between piston 22 and intermediate end cap 16, thereby buffering the impact force between the two.

[0067] Please see Figures 5 to 8 The throttling section 42 is a throttling orifice 421, which is located on the side of the first baffle 221. The throttling orifice 421 communicates with the opening 2221 of the first baffle 221. The medium in the second cavity 112 flows in through the throttling orifice 421 on the side of the first baffle 221 and enters the interior of the first baffle 221, forming a flow resistance between the first baffle 221 and the intermediate end cover 16, thereby buffering the impact force between the piston 22 and the intermediate end cover 16. And / or (see [link to relevant documentation]). Figure 9 and Figure 10 The throttle orifice 421 is opened on the side of the intermediate end cover 16 and penetrates the surface of the intermediate end cover 16 toward the piston 22, which also allows the medium to flow from the throttle orifice 421 into the space between the piston 22 and the intermediate end cover 16 to form a flow resistance.

[0068] Preferably, the outer diameter of the portion of the intermediate end cap 16 located in the second cavity 112 is smaller than the outer diameter of the portion of the intermediate end cap 16 located in the first cavity 111. That is, the outer peripheral wall of the portion of the intermediate end cap 16 located in the second cavity 112 is spaced apart from the second cavity 112. The throttling orifice 421 is opened on the outer surface of the intermediate end cap 16 located in the second cavity 112, so that the medium in the second cavity 112 is introduced between the piston 22 and the intermediate end cap 16, while preventing the medium in the first cavity 111 from being introduced, so that the first cavity 111 and the second cavity 112 are always separated, preventing the pressure in the two cavities from balancing and thus preventing the piston 22 from moving.

[0069] Please see Figure 8 and Figure 9 The throttling orifice 421 is circular, or semi-circular and penetrates the end face of the opening 2221 of the first baffle 221, or the throttling orifice 421 is triangular, rhomboid or other shapes.

[0070] There are multiple throttling orifices 421, which are evenly arranged along the axial direction of the intermediate end cover 16 and / or the first baffle 221, so that more medium can enter between the piston 22 and the intermediate end cover 16.

[0071] Example 3

[0072] Please see Figure 11 and Figure 12 The structure of Embodiment 3 is basically the same as that of Embodiment 2, and the similarities will not be repeated. The difference lies in the arrangement and location of the throttling section 42:

[0073] The throttling section 42 is a throttling groove 422, which is formed on the surface of the intermediate end cap 16 facing the piston 22. The throttling groove 422 penetrates the side of the intermediate end cap 16 to allow the medium to flow into the throttling groove 422. Alternatively, the first baffle 221 is plate-shaped, and the throttling groove 422 is formed on the surface of the first baffle 221 near the intermediate end cap 16. The throttling groove 422 penetrates the side of the first baffle 221 to allow the medium to flow into the throttling groove 422. When the intermediate end cap 16 and the piston 22 are about to collide, the medium flows into the throttling groove 422, forming a flow resistance between the intermediate end cap 16 and the piston 22.

[0074] In this embodiment, there are two throttling grooves 422, which form a cross shape. Both ends of the throttling grooves 422 penetrate the side of the first baffle 221 and / or the middle end cap 16, so that more medium can flow into the throttling grooves 422.

[0075] The present invention also provides an air conditioning unit, including the above-mentioned solenoid valve 100.

[0076] During operation, when the solenoid valve 100 needs to be closed, the pilot valve 30 reverses the flow, allowing the high-pressure medium to enter the third chamber 113 from the second capillary tube 104. The medium in the second chamber 112 flows out from the first capillary tube 103, thereby pushing the piston 22 towards the valve seat 17. When the piston 22 is about to hit the intermediate end cover 16, the piston 22 and the intermediate end cover 16 impact the buffer structure 40, thereby mitigating the impact force of the piston 22 on the intermediate end cover 16, improving the weld fixation of the intermediate end cover 16, and reducing noise.

[0077] The technical features of the above embodiments can be combined in any way. 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.

[0078] The embodiments described above are merely illustrative 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 patent. 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 all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A bidirectional solenoid valve, comprising a valve body assembly (10) and a valve core assembly (20), wherein a first communication port (12) and a second communication port (13) are respectively provided on both sides of the valve body assembly (10), the valve body assembly (10) has a valve cavity (11), the valve core assembly (20) is disposed in the valve cavity (11), and the valve core assembly (20) is capable of sliding within the valve cavity (11) to connect or disconnect the first communication port (12) and the second communication port (13); Its features are, The valve chamber (11) is provided with an intermediate end cap (16), the valve core assembly (20) includes a piston (22), the piston (22) is located on the side of the intermediate end cap (16) away from the first communication port (12) or the second communication port (13), the bidirectional solenoid valve includes a buffer structure (40), the buffer structure (40) is provided on the piston (22) and / or the intermediate end cap (16), and is located between the intermediate end cap (16) and the piston (22), for buffering the impact force between the piston (22) and the intermediate end cap (16); The piston (22) includes a first baffle (221) which is located near the intermediate end cap (16). The cross-section of the first baffle (221) is "U" shaped and has an opening (2221) at one end. During the valve closing process, the end face of the opening (2221) can abut against the intermediate end cap (16).

2. The bidirectional solenoid valve according to claim 1, characterized in that, The buffer structure (40) is a buffer pad (41), which is located on the side of the middle end cap (16) facing the piston (22) and can abut against the piston (22).

3. The bidirectional solenoid valve according to claim 2, characterized in that, The area of ​​the opening (2221) facing the end face of the intermediate end cap (16) is smaller than the area of ​​the surface of the buffer pad (41) facing the first baffle (221).

4. The bidirectional solenoid valve according to claim 1, characterized in that, The piston (22) has a throttling section (42) on the side near the intermediate end cap (16) to form the buffer structure (40), the throttling section (42) allowing the medium to flow between the piston (22) and the intermediate end cap (16); and / or, the intermediate end cap (16) has a throttling section (42) on the side near the piston (22) to form the buffer structure (40), the throttling section (42) allowing the medium to flow between the piston (22) and the intermediate end cap (16).

5. The bidirectional solenoid valve according to claim 4, characterized in that, The throttling part (42) is a throttling orifice (421), which is opened on the side of the first baffle (221) and communicates with the opening (2221); and / or, the intermediate end cap (16) is cylindrical, and the throttling orifice (421) is opened on the side of the intermediate end cap (16) and penetrates the surface of the intermediate end cap (16) toward the piston (22).

6. The bidirectional solenoid valve according to claim 4, characterized in that, The throttling section (42) is a throttling groove (422), which is formed on the surface of the intermediate end cap (16) near the piston (22) and extends through the side of the intermediate end cap (16); and / or, the piston (22) includes a first baffle (221) disposed near the intermediate end cap (16), and the throttling groove (422) is formed on the surface of the first baffle (221) near the intermediate end cap (16) and extends through the side of the first baffle (221).

7. The bidirectional solenoid valve according to claim 1, characterized in that, The valve core assembly (20) further includes a connecting rod (21) and a slider (23). The connecting rod (21) is connected to the slider (23). The slider (23) includes a first part (231) and a second part (232) arranged opposite to each other. The first part (231) and the second part (232) can respectively block the first communication port (12) and the second communication port (13).

8. The bidirectional solenoid valve according to claim 7, characterized in that, An elastic member (233) is provided between the first part (231) and the second part (232), and the two ends of the elastic member (233) abut against the first part (231) and the second part (232) respectively.

9. The bidirectional solenoid valve according to claim 1, characterized in that, The valve body assembly (10) includes a valve body (18) and a valve seat (17), the valve seat (17) being fixed inside the valve body (18), and the intermediate end cap (16) being fixed inside the valve body (18).

10. An air conditioning unit, characterized in that, Includes the bidirectional solenoid valve as described in any one of claims 1-9.

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