Reversible solenoid valve and air conditioning unit

Abstract

1. A reversible solenoid valve and an air conditioning unit comprising: a valve body (10) and a valve core assembly (20), the valve body (10) having a valve chamber (11), the valve core assembly (20) being disposed in the valve chamber (11), the valve core assembly (20) including a piston member (21) and a connecting rod member (22), the piston member (21) being provided with a connecting hole (201), one end of the connecting rod member (22) being connected to the piston member (21) through the connecting hole (201), the connecting rod member (22) including a tapered segment (2211), an outer diameter of the tapered segment (2211) gradually changing along an axial direction of the connecting rod member (22), the tapered segment (2211) being capable of entering into the connecting hole (201) and abutting against an inner wall of the connecting hole (201) so that the connecting rod member (22) is sealingly connected to the piston member (21).

Description

[Technical field]

[0001] Related Applications This application claims priority to a Chinese patent application filed on May 20, 2021, bearing application number 202121093980.6 and titled "Reversible Solenoid Valve and Air Conditioning Unit," the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of refrigeration, and in particular to reversible solenoid valves and air conditioning units. [Background technology]

[0003] Air conditioning units in the related art usually need to be set to two modes, cooling and heating, and the flow directions of the medium in the two modes are different. Usually, in either of the two modes, it is necessary to provide a blocking member to control the communication or blocking of the pipeline.

[0004] The reversible solenoid valve in the related art has a problem that the connection between the connecting rod and the piston member has poor sealing performance, which causes leakage and cross flow of the medium. Summary of the Invention

[0005] According to various embodiments of the present application, a reversible solenoid valve is provided.

[0006] The reversible solenoid valve includes a valve body and a valve core assembly, a first communication port and a second communication port are respectively drilled on both sides of the valve body, the valve body has a valve chamber, the valve core assembly is disposed in the valve chamber and can slide in the valve chamber so as to communicate or block the first communication port and the second communication port, the valve core assembly includes a piston member and a connecting rod member, the piston member is drilled with a connecting hole, one end of the connecting rod member is connected to the piston member through the connecting hole, the connecting rod member includes a tapered segment, an outer diameter of the tapered segment gradually changes along the axial direction of the connecting rod member, and the tapered segment can enter the connecting hole and abut against an inner wall of the connecting hole so as to sealingly connect the connecting rod member to the piston member.

[0007] In one embodiment, the tapered segment has a first end and a second end arranged opposite to each other, the first end is arranged closer to the first communication port than the second end, an outer diameter D1 of the first end is larger than an outer diameter D2 of the second end, the piston member includes a piston cup, an outer wall of the piston cup abuts against an inner wall of the valve body, the connecting hole includes a first hole, the first hole is drilled in the piston cup, and when an inner diameter of the first hole is D3, D1, D2 and D3 satisfy the relation: D1>D3>D2.

[0008] In one embodiment, the piston member further includes an intermediate baffle, the piston cup includes a first cup and a second cup, the first cup and the second cup are respectively provided on either side of the intermediate baffle, the connecting hole further includes a second hole communicating with the first hole, the second hole is drilled in the intermediate baffle, and the inner diameter D4 of the second hole is larger than the outer diameter D1 of the first end.

[0009] In one embodiment, the piston member further includes a first baffle and a second baffle, the first baffle disposed within the first cup and the second baffle disposed within the second cup, and the connecting rod member extends through each of the first and second baffles.

[0010] In one embodiment, the piston member further includes a first resilient member, the first resilient member being disposed within the piston cup and abutting a side wall of the piston cup.

[0011] In one embodiment, the valve core assembly further includes a nut, and one end of the connecting rod member protrudes from the connecting hole and is threadedly connected to the nut.

[0012] In one embodiment, an intermediate end cover is provided within the valve chamber, the intermediate end cover divides the valve chamber into a flow chamber and a pressure chamber, the flow chamber can be communicated with a first communication port and a second communication port, the piston member divides the pressure chamber into a first chamber and a second chamber, and a pressure difference can be formed between the first chamber and the second chamber to move the piston member.

[0013] In one embodiment, the valve core assembly further includes a slider member, the connecting rod member includes a connecting rod and a guide frame connected to each other, the guide frame is fitted to the outside of the slider member, and the piston member is connected to one end of the connecting rod remote from the slider member, and the slider member can slide by driving the piston member to block the first communication port and the second communication port.

[0014] In one embodiment, a limiting groove is drilled at one end of the guide frame, a positioning groove is drilled at one end of the connecting rod, the guide frame enters the positioning groove, and a side wall of a part of the connecting rod abuts against the side wall of the limiting groove.

[0015] The present application further provides the following technical aspects. The air conditioning unit includes a reversible solenoid valve as described above.

[0016] The details of one or more embodiments of the application are set forth in the drawings and description below. Other features, objects, and advantages of the application will become apparent from the description, drawings, and claims. [Brief description of the drawings]

[0017] To better describe and explain the embodiments and / or examples of these applications disclosed herein, reference may be made to one or more drawings, in which additional details or examples used to explain the drawings should not be construed as limiting the scope of any of the disclosed applications, the embodiments and / or examples described herein, and the best mode of these applications as understood herein.

[0018] [Figure 1] FIG. 1 is a cross-sectional view of a reversible solenoid valve according to one or more embodiments. [Diagram 2] FIG. 2 is an enlarged view of a portion A in FIG. [Diagram 3] 11 is a schematic diagram of a first cup deforming during tightening of a nut according to one or more embodiments. FIG. [Figure 4] FIG. 1 illustrates a partial cross-sectional view of a connecting rod according to one or more embodiments. [Diagram 5] FIG. 13 is a cross-sectional view of a connecting rod member according to one or more embodiments. [Figure 6] FIG. 1 is a perspective view of a connecting rod member according to one or more embodiments. [Figure 7] FIG. 13 is a top view of a first cup according to one or more embodiments. [Figure 8] FIG. 2 is a left side view of a first cup according to one or more embodiments. [Figure 9] FIG. 2 is a perspective view of a first cup according to one or more embodiments. [Figure 10] 1 is a schematic diagram illustrating the relationship between an air conditioning unit and a reversible solenoid valve according to one or more embodiments.

[0019] In the drawings, the meanings of the symbols are as follows: 100 Reversible solenoid valve / solenoid valve, 10 Valve body, 101 First communication port, 102 Second communication port, 103 First connecting tube, 104 Second connecting tube, 11 Valve chamber, 111 Flow chamber, 112 Pressure chamber, 1121 First chamber, 1122 Second chamber, 12 Valve seat, 13 Third communication port, 131 First capillary tube, 14 Fourth communication port, 141 Second capillary tube, 15 Intermediate end cover, 151 Mounting hole, 16 First end cover, 17 Second end cover, 20 Valve core assembly, 21 Piston member, 201 Connection hole, 211 Piston cup, 2111 First cup, 2112 Second cup, 2113 First hole, 212 Intermediate baffle, 2121 Second hole, 213 First baffle, 214 Second baffle, 215 First elastic member, 22 connecting rod member, 221 connecting rod, 2211 tapered segment, 2011 first end, 2012 second end, 2212 positioning groove, 222 guide frame, 2221 limiting groove, 23 slider member, 231 first part, 232 second part, 233 second elastic member, 24 nut, 300 air conditioning unit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, the technical aspects of the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, but it is clear that the described embodiments are only some of the embodiments of the present application, and are not all of the embodiments. Based on the embodiments of the present application, all other embodiments that a person skilled in the art can obtain without creative efforts all belong to the scope of protection of the present application.

[0021] It should be explained that when an assembly is said to be "mounted" to another assembly, it may be mounted directly to the other assembly, or there may be an intervening assembly present. When an assembly is said to be "mounted" to another assembly, it may be mounted directly to the other assembly, or there may be an intervening assembly present at the same time. When an assembly is said to be "fastened" to another assembly, it may be fastened directly to the other assembly, or there may be an intervening assembly present at the same time.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. In this specification, the terms used in this application are only for the purpose of describing specific embodiments, and are not intended to limit the scope of this application. As used herein, the term "or" includes one or more of any and all combinations of the associated items.

[0023] 1 to 9, the present application provides a reversible solenoid valve 100 (hereinafter simply referred to as solenoid valve 100) that is mounted on an air conditioning unit to control communication or cut-off of a pipeline.

[0024] The solenoid valve 100 of the present application can be used in air conditioning units that require bi-directional operation, for example, it can be installed in an air conditioning unit that has two functions, cooling mode and heating mode, simultaneously.

[0025] Referring to FIG. 1, the solenoid valve 100 includes a valve body 10 and a valve core assembly 20. The valve body 10 has a valve chamber 11. The valve body 10 assembly is provided with a first communication port 101 and a second communication port 102. The valve core assembly 20 is disposed in the valve chamber 11 and can slide in the valve chamber 11 so as to connect or disconnect the first communication port 101 and the second communication port 102.

[0026] Specifically, a valve seat 12 is provided within the valve body 10, the valve seat 12 is fixed within the valve body 10, a portion of the valve core assembly 20 can move within the valve seat 12, and the first communication port 101 and the second communication port 102 each pass through the valve seat 12.

[0027] A first connecting pipe 103 is provided in the first communication port 101, and a second connecting pipe 104 is provided in the second communication port 102, and the first connecting pipe 103 and the second connecting pipe 104 are respectively connected to a pipeline of an air conditioning unit.

[0028] An intermediate end cover 15 is provided in the valve chamber 11, and a first end cover 16 and a second end cover 17 are provided at both ends of the valve body 10, respectively. The first end cover 16 forms a flow chamber 111 together with the intermediate end cover 15, and the intermediate end cover 15 forms a pressure chamber 112 together with the second end cover 17. The intermediate end cover 15 cooperates with the valve core assembly 20 to divide the pressure chamber 112 into a first chamber 1121 and a second chamber 1122. When the solenoid valve 100 is in an open state, the flow chamber 111 is communicated with the first communication port 101 and the second communication port 102. The medium in the first chamber 1121 and the second chamber 1122 forms a pressure difference, and the communication or blocking between the first communication port 101 and the second communication port 102 can be controlled by moving the valve core assembly 20, thereby realizing a two-way function, simplifying the pipeline of the air conditioning unit, and reducing costs.

[0029] An attachment hole 151 is drilled in the intermediate end cover 15, and a part of the valve core assembly 20 is inserted into the attachment hole 151, a part of the valve core assembly 20 is located on the side of the intermediate end cover 15 adjacent to the first end cover 16, and the other part of the valve core assembly 20 is located on the side of the intermediate end cover 15 adjacent to the second end cover 17.

[0030] The valve body 10 is provided with a third communication port 13 and a fourth communication port 14, the third communication port 13 is connected to the first chamber 1121, and the fourth communication port 14 is connected to the second chamber 1122. A first capillary tube 131 is provided in the third communication port 13, and a second capillary tube 141 is provided in the fourth communication port 14. The first capillary tube 131 and the second capillary tube 141 are connected to a pilot valve described below so as to form a pressure difference on both sides of the valve core assembly 20 to move the valve core assembly 20.

[0031] The valve core assembly 20 includes a connecting rod member 22 and a slider member 23 , the slider member 23 is connected to the connecting rod member 22 , one end of which is inserted into the mounting hole 151 .

[0032] 4 to 6, the connecting rod member 22 includes a connecting rod 221 and a guide frame 222 connected to each other. The guide frame 222 is fitted to the outside of the slider member 23 and guides the slider member 23 to prevent the slider member 23 from tilting during movement due to the impact of the medium, which may affect the sealing ability of the slider member 23 to block the first communication port 101 and the second communication port 102, and also to prevent the slider member 23 from tilting and interfering with the inner wall of the valve chamber 11.

[0033] A positioning groove 2212 is drilled at one end of the connecting rod 221 facing the guide frame 222, and a limiting groove 2221 is drilled at one end of the guide frame 222 close to the connecting rod 221, so that the guide frame 222 enters into the positioning groove 2212, and the positioning groove 2212 can limit the depth of the guide frame 222 entering the connecting rod 221. An outer wall of a part of the connecting rod 221 abuts against a side wall of the limiting groove 2221, and the limiting groove 2221 can play a limiting role for the connecting rod 221, so as to ensure the concentricity of the connecting rod 221 and the guide frame 222.

[0034] In this way, the connecting rod 221 can be positioned, and the coaxiality between the connecting rod 221 and the guide frame 222 is improved.

[0035] 1, the slider member 23 includes a first portion 231 and a second portion 232, the first portion 231 abuts against the second portion 232, the first portion 231 is provided adjacent to the first communication port 101, and the second portion 232 is provided adjacent to the second communication port 102. The first portion 231 can close the first communication port 101, and the second portion 232 can close the second communication port 102.

[0036] Specifically, a second elastic member 233 is provided between the first part 231 and the second part 232, one end of the second elastic member 233 abuts the first part 231 and the other end abuts the second part 232, and the second elastic member 233 adheres the first part 231 and the second part 232 to the end faces of the first communication port 101 and the second communication port 102, respectively, so as to improve the sealing performance of the blocking.

[0037] The valve core assembly 20 further includes a piston member 21 that is disposed within the pressure chamber 112 and is connected to one end of the connecting rod 221 remote from the slider member 23 and abuts against the inner wall of the valve chamber 11 so as to isolate the first chamber 1121 and the second chamber 1122.

[0038] Furthermore, a connecting hole 201 is drilled in the piston member 21, and the connecting rod 221 passes through the connecting hole 201 and is connected to the piston member 21. The connecting rod 221 includes a tapered segment 2211, and the outer diameter of the tapered segment 2211 gradually changes along the axial direction of the connecting rod 221. The tapered segment 2211 is inserted into the connecting hole 201 and abuts against the inner wall of the connecting hole 201 so that the connecting rod 221 is sealingly connected to the piston member 21, thereby forming a tapered face seal.

[0039] In this way, the connecting rod member 22 and the piston member 21 are sealed together, preventing leakage of the medium from causing a lateral flow.

[0040] The piston member 21 includes a cup-shaped piston cup 211, and an outer wall of the piston cup 211 can abut against an inner wall of the valve chamber 11 so that the piston member 21 slides in a sealed manner within the valve chamber 11. The piston cup 211 can be made of polytetrafluoroethylene.

[0041] 2 and 4, the connecting hole 201 includes a first hole 2113, the first hole 2113 is drilled in the piston cup 211, the tapered segment 2211 has a truncated cone shape and has a first end 2011 and a second end 2012 that are provided opposite each other, the first end 2011 is provided closer to the first communication port 101 than the second end 2012, the outer diameter D1 of the first end 2011 is larger than the outer diameter D2 of the second end 2012, and when the inner diameter of the first hole 2113 is D3, D1, D2 and D3 satisfy the relation: D1>D3>D2. The inner wall of the first hole 2113 interferes with the tapered segment 2211, improving the sealing performance.

[0042] In this way, the piston cup 211 interferes with the tapered segment 2211, improving the sealing effect.

[0043] The piston cup 211 includes a first cup 2111 and a second cup 2112, both of which are cup-shaped, and the piston member 21 further includes an intermediate baffle 212, and the first cup 2111 and the second cup 2112 are respectively provided on both sides of the intermediate baffle 212 and are provided back-to-back. The intermediate baffle 212 plays a role in connecting and supporting the first cup 2111 and the second cup 2112.

[0044] The first cup 2111 is provided adjacent to the slider member 23, and the first hole 2113 is drilled in the first cup 2111, that is, the first cup 2111 interferes with the tapered segment 2211. The inner diameter of the inner hole of the second cup 2112 is equal to the inner diameter of the inner hole of the first cup 2111, in other words, the second cup 2112 and the first cup 2111 have the same structure and dimensions, and are easy to process.

[0045] The connecting hole 201 further includes a second hole 2121 communicating with the first hole 2113, the second hole 2121 being drilled in the intermediate baffle 212, and an inner diameter D4 of the second hole 2121 is larger than an outer diameter D1 of the first end 2011. Since the intermediate baffle 212 is made of stainless steel, the intermediate baffle 212 and the connecting rod 221 are spaced apart from each other to prevent the intermediate baffle 212 from interfering with the tapered segment 2211 and affecting the sealing performance between the piston cup 211 and the tapered segment 2211.

[0046] In this manner, the intermediate baffle 212 and the connecting rod member 22 are provided at a distance from each other, and the intermediate baffle 212 is prevented from interfering with the connecting rod member 22 and affecting the sealing performance between the piston cup 211 and the connecting rod member 22.

[0047] The piston member 21 further includes a first baffle 213 and a second baffle 214, the first baffle 213 being provided in the first cup 2111 and provided in the first chamber 1121, the second baffle 214 being provided in the second cup 2112 and provided in the second chamber 1122, and the connecting rod 221 passing through each of the first baffle 213 and the second baffle 214. The first baffle 213 can abut against the intermediate end cover 15 and plays a role of stopping the valve when it is closed, and the second baffle 214 can abut against the second end cover 17 and plays a role of stopping the valve when it is opened. The first baffle 213, the first cup 2111, the intermediate baffle 212, the second cup 2112 and the second baffle 214 are connected by screws or rivets.

[0048] In this way, the strength of the piston member 21 can be improved.

[0049] The piston member 21 further includes a first elastic member 215, which is disposed in the piston cup 211 and abuts against the inner wall of the piston cup 211, so as to improve the sealing effect of the piston cup 211. In this embodiment, there are two first elastic members 215, which are disposed in the first cup 2111 and the second cup 2112, respectively.

[0050] In this way, the sealing performance between the piston cup 211 and the inner wall of the valve chamber 11 can be improved.

[0051] Optionally, the first elastic member 215 is an annular toothed spring, which can improve elasticity.

[0052] The valve core assembly 20 further includes a nut 24, which is disposed in the second chamber 1122, and the connecting rod 221 protrudes from the connecting hole 201 and is screw-connected to the nut 24. Referring to Fig. 3, when the nut 24 is fastened to one end of the connecting rod 221, the tapered segment 2211 presses against the inner wall of the first hole 2113, so that the edge of the first cup 2111 flanges toward the intermediate baffle 212, and the flange of the first cup 2111 fills the gap between the intermediate baffle 212 and the connecting rod 221, so that the connecting rod 221 and the piston member 21 are sealed.

[0053] This makes it easier to connect the connecting rod member 22 and the piston member 21, and when the nut 24 is screwed into the connecting rod member 22, the first hole 2113 of the piston cup 211 can deform the portion that interferes with the connecting rod member 22, thereby filling the gap between the intermediate baffle 212 and the connecting rod member 22.

[0054] The solenoid valve 100 further includes a pilot valve (not shown), which is provided on the outside of the valve seat 12 and connected to the first capillary tube 131 and the second capillary tube 141. The piston member 21 is moved by controlling the pressure difference between both sides of the piston member 21 by changing the direction of the pilot valve.

[0055] As shown in FIG. 10, the present application further provides an air conditioning unit 300, which includes the above-mentioned reversible solenoid valve 100.

[0056] In the operation process, when it is necessary to close the solenoid valve 100, the pilot valve changes direction, causing the high pressure medium to be taken in from the second capillary 141 into the second chamber 1122 and the medium in the first chamber 1121 to flow out from the first capillary 131, so the piston member 21 is moved in a direction approaching the valve seat 12, and the slider member 23 blocks the first communication port 101 and the second communication port 102. When it is necessary to open the solenoid valve 100, the pilot valve changes direction, causing the high pressure medium to be taken in from the first capillary 131 into the first chamber 1121 and the medium in the second chamber 1122 to flow out from the second capillary 141, so the piston member 21 is moved in a direction away from the valve seat 12, and the slider member 23 releases the blockage of the first communication port 101 and the second communication port 102. When the air conditioning unit 300 is switched from cooling mode to heating mode or from heating mode to cooling mode, the medium flow direction is reversed, but the solenoid valve 100 can still work normally.

[0057] In the present application, a taper segment 2211 is provided on a connecting rod 221, and the taper segment 2211 abuts against the inner wall of the connecting hole 201, whereby the taper segment 2211 forms a taper surface seal with the connecting hole 201, improving sealing performance.

[0058] Each of the technical features of the above-mentioned embodiments may be combined in any combination. For the sake of brevity, not all possible combinations of each of the technical features in the above-mentioned embodiments have been described. However, as long as there is no contradiction in the combination of these technical features, all of them should be considered within the scope described in this specification.

[0059] The above examples merely show some embodiments of the present application, and although the description is relatively specific and detailed, it should not be understood as limiting the scope of the utility model claims. It should be noted that those skilled in the art can make some modifications and improvements without departing from the spirit of the present application, all of which are within the scope of protection of the present application. Therefore, the scope of protection of the patent of the present application shall be subject to the scope of the attached claims.

Claims

1. a valve body and a valve core assembly; A first communication port and a second communication port are formed on both sides of the valve body, The valve body has a valve chamber, the valve core assembly is provided in the valve chamber and is slidable within the valve chamber so as to establish or block communication between the first communication port and the second communication port; The valve core assembly includes a piston member and a connecting rod member. A connection hole is formed in the piston member, One end of the connecting rod member is connected to the piston member through the connecting hole, the connecting rod member includes a tapered segment; an outer diameter of the tapered segment varies gradually along an axial length of the connecting rod member; the tapered segment may extend into the connecting hole and abut an inner wall of the connecting hole such that the connecting rod member is sealingly connected to the piston member; the tapered segment has a first end and a second end provided opposite to each other, the first end is provided closer to the first communication port than the second end, and an outer diameter D 1 of the first end is larger than an outer diameter D 2 of the second end, The piston member includes a piston cup, an outer wall of the piston cup abutting against an inner wall of the valve body, the connecting hole includes a first hole, the first hole is drilled in the piston cup, and when an inner diameter of the first hole is D3, D1, D2 and D3 satisfy a relational formula: D1 > D3 > D2; Reversible solenoid valve.

2. The piston member further includes an intermediate baffle. The piston cup includes a first cup and a second cup, The first cup and the second cup are provided on both sides of the intermediate baffle, the connection hole further includes a second hole communicating with the first hole, The second hole is formed in the intermediate baffle, The inner diameter D of the second hole 4 is the outer diameter D of the first end 1 The reversible solenoid valve according to claim 1 , wherein

3. The piston member further includes a first baffle and a second baffle. the first baffle is disposed within the first cup, the second baffle is disposed within a second cup, 3. The reversible solenoid valve of claim 2, wherein the connecting rod member passes through each of the first baffle and the second baffle.

4. The piston member further includes a first elastic member, 2. The reversible solenoid valve according to claim 1, wherein the first elastic member is provided within the piston cup and abuts against a side wall of the piston cup.

5. The valve core assembly further includes a nut.

2. The reversible solenoid valve according to claim 1, wherein one end of the connecting rod member protrudes from the connecting hole and is threadedly connected to the nut.

6. A valve body and a valve core assembly, A first communication port and a second communication port are formed on both sides of the valve body, The valve body has a valve chamber, the valve core assembly is provided in the valve chamber and is slidable within the valve chamber so as to establish or block communication between the first communication port and the second communication port; The valve core assembly includes a piston member and a connecting rod member. A connection hole is formed in the piston member, One end of the connecting rod member is connected to the piston member through the connecting hole, the connecting rod member includes a tapered segment; an outer diameter of the tapered segment varies gradually along an axial length of the connecting rod member; the tapered segment may extend into the connecting hole and abut an inner wall of the connecting hole such that the connecting rod member is sealingly connected to the piston member; an intermediate end cover is provided within the valve chamber, the intermediate end cover divides the valve chamber into a flow chamber and a pressure chamber, the flow chamber is capable of communicating with the first communication port and the second communication port, The piston member divides the pressure chamber into a first chamber and a second chamber, and the first chamber and the second chamber can create a pressure difference to move the piston member. Reversible solenoid valve.

7. The valve core assembly further includes a slider member. The connecting rod member includes a connecting rod and a guide frame connected to each other, the guide frame is fitted to the outside of the slider member, the piston member is connected to one end of the connecting rod remote from the slider member; 7. The reversible solenoid valve according to claim 6, wherein the slider member is slidable by driving the piston member, and is capable of closing the first communication port and the second communication port.

8. A limiting groove is formed at one end of the guide frame, A positioning groove is drilled in one end of the connecting rod, The reversible solenoid valve according to claim 7 , wherein the guide frame is inserted into the positioning groove, and an outer wall of a portion of the connecting rod abuts against a side wall of the limiting groove.

9. Includes a reversible solenoid valve, The reversible solenoid valve includes a valve body and a valve core assembly, A first communication port and a second communication port are formed on both sides of the valve body, The valve body has a valve chamber, the valve core assembly is provided in the valve chamber and is slidable within the valve chamber so as to establish or block communication between the first communication port and the second communication port; The valve core assembly includes a piston member and a connecting rod member. A connection hole is formed in the piston member, One end of the connecting rod member is connected to the piston member through the connecting hole, the connecting rod member includes a tapered segment; an outer diameter of the tapered segment varies gradually along an axial length of the connecting rod member; the tapered segment may extend into the connecting hole and abut an inner wall of the connecting hole such that the connecting rod member is sealingly connected to the piston member; the tapered segment has a first end and a second end provided opposite to each other, the first end is provided closer to the first communication port than the second end, and an outer diameter D 1 of the first end is larger than an outer diameter D 2 of the second end, the piston member includes a piston cup, an outer wall of the piston cup abuts against an inner wall of the valve body, and the connection hole includes a first hole, the first hole is drilled in the piston cup, and when an inner diameter of the first hole is D3, D1, D2 and D3 satisfy a relational formula: D1 > D3 > D2; Air conditioning unit.

10. The piston member further includes an intermediate baffle. The piston cup includes a first cup and a second cup, The first cup and the second cup are provided on both sides of the intermediate baffle, the connection hole further includes a second hole communicating with the first hole, The second hole is formed in the intermediate baffle, The inner diameter D of the second hole 4 is the outer diameter D of the first end 1 10. The air conditioning unit of claim 9, wherein said air conditioning unit is greater than

11. The piston member further includes a first baffle and a second baffle. the first baffle is disposed within the first cup, the second baffle is disposed within a second cup, 11. The air conditioning unit of claim 10, wherein the connecting rod member passes through each of the first baffle and the second baffle.

12. The piston member further includes a first elastic member, 10. The air conditioning unit according to claim 9, wherein the first elastic member is provided within the piston cup and abuts against a side wall of the piston cup.

13. The valve core assembly further includes a nut.

10. The air conditioning unit according to claim 9, wherein one end of the connecting rod member protrudes from the connection hole and is threadably connected to the nut.

14. A reversible solenoid valve, The reversible solenoid valve includes a valve body and a valve core assembly, A first communication port and a second communication port are formed on both sides of the valve body, The valve body has a valve chamber, the valve core assembly is provided in the valve chamber and is slidable within the valve chamber so as to establish or block communication between the first communication port and the second communication port; The valve core assembly includes a piston member and a connecting rod member. A connection hole is formed in the piston member, One end of the connecting rod member is connected to the piston member through the connecting hole, the connecting rod member includes a tapered segment; an outer diameter of the tapered segment varies gradually along an axial length of the connecting rod member; the tapered segment may extend into the connecting hole and abut an inner wall of the connecting hole such that the connecting rod member is sealingly connected to the piston member; An intermediate end cover is provided within the valve chamber, the intermediate end cover divides the valve chamber into a flow chamber and a pressure chamber, The flow chamber can be in communication with the first communication port and the second communication port, the piston member divides the pressure chamber into a first chamber and a second chamber, A pressure difference can be formed between the first chamber and the second chamber to move the piston member. Air conditioning unit.

15. The valve core assembly further includes a slider member. The connecting rod member includes a connecting rod and a guide frame connected to each other, the guide frame is fitted to the outside of the slider member, the piston member is connected to one end of the connecting rod remote from the slider member; 15. The air conditioning unit according to claim 14, wherein the slider member is slidable by being driven by the piston member, and is capable of closing the first communication port and the second communication port.

16. A limiting groove is formed at one end of the guide frame, A positioning groove is drilled in one end of the connecting rod, The air conditioning unit according to claim 15, wherein the guide frame fits into the positioning groove, and an outer wall of a portion of the connecting rod abuts against a side wall of the limiting groove.

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