An expansion valve

Abstract

The utility model discloses an expansion valve, including valve body subassembly and valve needle, valve body subassembly includes valve seat and valve core, the first end of valve core sets up in valve seat, forms the valve hole on valve core, valve needle with valve hole is opposite, and can be close or far away valve hole, to adjust the opening of expansion valve, two ends of valve core are provided with the slow flow hole respectively, two slow flow holes are located two ends opposite of valve hole and with valve hole through -going, the diameter of slow flow hole is greater than the diameter of valve hole, valve body subassembly still includes the noise reduction board of setting in slow flow hole, the noise reduction board with valve hole forms interval, is provided with the through -hole of allowing valve needle to pass on the noise reduction board of valve needle one side, is provided with the noise reduction channel on the noise reduction board, the noise reduction channel, slow flow hole and valve hole interpenetration. The utility model discloses have the effect of noise reduction and sound elimination.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to an expansion valve that can reduce noise. Background Technology

[0002] The expansion valve is an important component in refrigeration and air conditioning systems, and its main function is to regulate the flow of refrigerant.

[0003] In related technologies, the fluid in the expansion valve directly enters or exits the throttling channel of the valve body. During cooling or heating, the fluid velocity in the expansion valve is too fast, which can easily generate turbulence and whistling noise during the flow process. Especially in the case of two-phase flow (gas and liquid mixing), the uneven mixing of gas and liquid makes it easier to generate noise, which in turn affects the product quality of refrigeration equipment or air conditioners. Utility Model Content

[0004] This utility model aims to solve one of the technical problems in related technologies to a certain extent. To this end, this utility model provides an expansion valve with noise reduction and silencing effects.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an expansion valve, comprising a valve body assembly and a valve needle, wherein the valve body assembly comprises a valve seat and a valve core, the first end of the valve core is disposed in the valve seat, a valve hole is formed on the valve core, and the valve needle is opposite to the valve hole and can move closer to or further away from the valve hole to adjust the opening degree of the expansion valve.

[0006] The valve core has flow-slowing holes at both ends. The two flow-slowing holes are located at opposite ends of the valve hole and communicate with the valve hole. The diameter of the flow-slowing holes is larger than the diameter of the valve hole. The valve body assembly also includes a noise reduction plate disposed in the flow-slowing holes. The noise reduction plate is spaced from the valve hole. The noise reduction plate located on the valve needle side has a through hole that allows the valve needle to pass through. The noise reduction plate has a noise reduction channel. The noise reduction channel, the flow-slowing holes and the valve hole communicate with each other.

[0007] In this technical solution, the valve core is equipped with a flow-slowing orifice and a noise-reducing plate at both ends. When the expansion valve is in use, when the liquid flows through the flow-slowing orifice and the noise-reducing plate, the flow velocity is reduced because the diameter of the flow-slowing orifice is larger than the diameter of the valve orifice. This also makes the mixing of the two phases more uniform, thereby reducing the noise of the liquid flow. By setting noise-reducing plates on both sides of the valve orifice, two noise reduction processes can be achieved on the flow path of the liquid, improving the quality of noise reduction and silencing.

[0008] Furthermore, the noise reduction plate has multiple through holes circumferentially distributed around its axis. These through holes penetrate the noise reduction plate and form a circumferentially closed structure. The multiple through holes together form the noise reduction channel.

[0009] Furthermore, the number of through holes is 2 to 10.

[0010] Furthermore, the noise reduction board includes a board body and multiple protruding teeth. The multiple protruding teeth protrude from the outer side wall of the board body and are circumferentially spaced around the axis of the board body. The gaps between adjacent protruding teeth form the noise reduction channel.

[0011] Furthermore, the thickness of the noise reduction plate is between 0.5mm and 2mm.

[0012] Furthermore, the noise reduction plate is made of metal and is welded or riveted to the valve core.

[0013] Furthermore, a central hole is formed on the noise reduction plate, the central hole penetrates the noise reduction plate, the central hole is coaxial with the valve hole, and the diameter of the central hole is smaller than the diameter of the valve hole.

[0014] Furthermore, a limiting stage is formed on the inner wall of the slow-flow hole, the end face of the noise reduction plate is fitted with the limiting stage, and the outer wall of the noise reduction plate abuts against the inner wall of the slow-flow hole.

[0015] Furthermore, multiple noise reduction plates are provided inside the flow-slowing hole, with the multiple noise reduction plates in the same flow-slowing hole being stacked or spaced apart.

[0016] Furthermore, the valve body assembly also includes a first connecting pipe and a second connecting pipe. The first connecting pipe is coaxially connected to the valve seat, and the second connecting pipe is connected to the side wall of the valve seat and communicates with the inner cavity of the valve seat. The valve core is disposed between the first connecting pipe and the second connecting pipe, and the second end of the valve core is disposed inside the first connecting pipe.

[0017] These features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. The preferred embodiments or means of this utility model will be shown in detail in conjunction with the accompanying drawings, but this is not intended to limit the technical solution of this utility model. In addition, each of these features, elements and components appearing in the following text and drawings is multiple and is labeled with different symbols or numbers for convenience, but all represent parts with the same or similar structure or function. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings:

[0019] Figure 1This is a front sectional view of the expansion valve according to one embodiment of the present invention;

[0020] Figure 2 for Figure 1 Enlarged view of a portion of the image (schematic diagram of liquid flow);

[0021] Figure 3 This is an assembly structure diagram of the valve seat, valve core, and noise reduction plate according to one embodiment of the present utility model;

[0022] Figure 4 This is an assembly structure diagram of the valve core and noise reduction plate according to one embodiment of the present utility model;

[0023] Figure 5 This is an assembly structure diagram of the valve core and noise reduction plate according to one embodiment of the present utility model (multiple noise reduction plates are provided in each flow-slowing hole);

[0024] Figure 6 This is a structural diagram of the first noise reduction board according to one embodiment of the present invention;

[0025] Figure 7 This is a structural diagram of the second noise reduction board according to one embodiment of the present invention;

[0026] Figure 8 This is a structural diagram of the second noise reduction board according to one embodiment of the present invention;

[0027] Figure 9 This is a structural diagram of the second noise reduction board according to one embodiment of the present invention;

[0028] Figure 10 This is a structural diagram of the second noise reduction board according to one embodiment of the present invention;

[0029] Figure 11 This is a structural diagram of the second noise reduction board according to one embodiment of the present invention;

[0030] Figure 12 This is a structural diagram of the second noise reduction board according to one embodiment of the present invention;

[0031] Figure 13 This is a structural diagram of the second noise reduction board according to one embodiment of the present invention;

[0032] Figure 14 This is a structural diagram of the second noise reduction board according to one embodiment of the present invention;

[0033] Figure 15 This is a structural diagram of the second noise reduction board according to one embodiment of the present invention.

[0034] in,

[0035] 10. Valve body assembly; 11. Valve seat; 12. Valve core; 121. Valve bore; 122. Flow retardant orifice; 123. Limiting stage;

[0036] 13. Noise reduction board; 131. Board body; 132. Raised tooth; 133. Through hole; 134. Center hole; 135. Through hole; 13a. First noise reduction board; 13b. Second noise reduction board;

[0037] 14. First connecting pipe; 15. Second connecting pipe;

[0038] 20. Valve needle;

[0039] 30. Rotor assembly; 31. Magnetic rotor; 32. Guide rail shaft; 33. Slip ring; 34. Stop rod;

[0040] 40. Outer shell. Detailed Implementation

[0041] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this utility model and should not be construed as limiting it.

[0042] The terms "an embodiment," "example," or "trademark" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this utility model. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0043] As one embodiment of this utility model, see the appendix. Figures 1 to 5 An expansion valve is disclosed, including a valve body assembly 10 and a valve needle 20. The valve body assembly 10 includes a valve seat 11 and a valve core 12. The first end of the valve core 12 is disposed in the valve seat 11. A valve hole 121 is formed on the valve core 12. The valve needle 20 is opposite to the valve hole 121 and can move closer to or further away from the valve hole 121 to adjust the opening degree of the expansion valve.

[0044] The valve core 12 has two flow-slowing holes 122 at its two ends. The two flow-slowing holes 122 are located at opposite ends of the valve hole 121 and communicate with the valve hole 121. The diameter of the flow-slowing hole 122 is larger than the diameter of the valve hole 121. The valve body assembly 10 also includes a noise reduction plate 13 disposed in the flow-slowing hole 122. The noise reduction plate 13 is spaced from the valve hole 121. The noise reduction plate 13 located on one side of the valve needle 20 is provided with a through hole 135 that allows the valve needle 20 to pass through. The noise reduction plate 13 is provided with a noise reduction channel. The noise reduction channel, the flow-slowing hole 122 and the valve hole 135 communicate with each other.

[0045] The expansion valve in this embodiment generally also includes a rotor assembly 30 and a housing 40. The rotor assembly 30 includes a magnetic rotor 31, a guide shaft 32, a slip ring 33, a stop rod 34, etc. The housing 40 is fixedly connected to the valve body. The rotor assembly 30 is disposed inside the housing 40. The guide shaft 32 and the valve needle 20 are connected by components such as springs and spring support seats. During use, the rotation of the magnetic rotor 31 drives the guide shaft 32 to rotate accordingly. The guide shaft 32 further drives the valve needle 20 to perform linear motion, thereby adjusting the opening degree of the expansion valve. The slip ring 33 is disposed on the guide shaft 32 through a spiral guide. The stop rod 34 is used to cooperate with the slip ring 33 to limit the start and stop positions of the linear motion of the guide shaft 32.

[0046] In this embodiment, the valve core 12 is generally welded and fixed in the valve body. The valve core 12 is provided with a valve hole 121 corresponding to the valve needle 20. The rotor assembly 30 drives the valve needle 20 to move linearly, so that the valve needle 20 approaches (inserts) or moves away from the valve hole 121.

[0047] In this embodiment, the valve core 12 is provided with a flow-slowing hole 122, which communicates with the valve hole 121. Furthermore, the expansion valve also includes a noise-reducing plate 13 disposed within the flow-slowing hole 122, and the noise-reducing plate 13 has noise-reduction channels. Figure 2 As can be seen, the flow path of the liquid in the valve body assembly 10 is the noise reduction channel, the slow flow hole 122, the valve hole 121, the slow flow hole 122, and the noise reduction channel. It can be seen that due to the setting of the noise reduction plate 13, the liquid flow will be blocked to a certain extent during the liquid flow process. The blockage of the liquid flow by the noise reduction plate 13 will reduce the flow velocity of the liquid. Moreover, since the diameter of the slow flow hole 122 is larger than the diameter of the valve hole 121, the flow cross section of the liquid will suddenly expand during the liquid flow process, which can also slow down the flow speed of the liquid and reduce noise.

[0048] It should be noted that noise reduction plates 13 are provided at both ends of the valve core 12 in this embodiment. In this way, the liquid will pass through the noise reduction plates 13 twice in one flow process. Compared with the expansion valve structure with noise reduction plates 13 designed on only one side, it can achieve a better noise reduction effect.

[0049] In this embodiment, the noise reduction plate 13 is disposed on the valve core 12. During the assembly of the expansion valve, the noise reduction plate 13 and the valve core 12 can be assembled separately first, and then installed together into the valve body after the two are assembled. In actual installation, the noise reduction plate 13 and the valve core 12 can be fixedly connected by one or more of the following connection methods: welding, riveting, snap-fitting, plugging, and others.

[0050] In this embodiment, the noise reduction plate 13 can be set as a metal sheet, generally made of the same material as the valve core 12, valve body, first connecting pipe 14, and second connecting pipe 15.

[0051] In this embodiment, the specific structure of the noise reduction channel is not specifically limited. It can be designed in various forms such as notches, grooves or holes according to actual needs. Moreover, the specific position can be set at the edge of the noise reduction plate 13 or at a position close to the inside. As long as the flow of liquid between the noise reduction channel and the valve hole 121 can reduce the noise generated by the liquid flow, it is acceptable.

[0052] In this embodiment, the noise reduction channels on the noise reduction plates 13 at both ends of the valve core 12 can be axially opposite each other or staggered when actually set up, and no specific limitation is made thereto.

[0053] This embodiment does not specifically limit the number of noise reduction plates 13 at each end of the valve core 12. In actual installation, each flow-slowing hole 122 can have only one noise reduction plate 13 or multiple noise reduction plates 13. When multiple noise reduction plates 13 are installed, they can be stacked or spaced apart, as shown in the attached figure. Figure 5 As shown.

[0054] It should be noted that the noise reduction plates 13 at both ends of the valve core 12 in this embodiment are slightly different in structure. In order to better adapt to the structure of the expansion valve, a through hole 135 is formed on the noise reduction plate 13 on one side of the valve needle 20 in this embodiment. The valve needle 20 passes through the through hole 135 and mates with the valve hole 121, as shown in the attached figure. Figure 1 , 2 As shown. This structural design, although it adds a noise reduction plate 13 to the valve body, does not affect the normal operation of the expansion valve.

[0055] In actual setup, to avoid interference between valve needle 20 and noise reduction plate 13 due to assembly errors, the diameter of through hole 135 is generally set to be larger than the diameter of valve needle 20.

[0056] To facilitate the description of the different structures of the noise reduction plates 13 at both ends of the valve core 12, the noise reduction plate 13 located on one side of the valve needle 20 is defined as the first noise reduction plate 13a, and the noise reduction plate 13 on the other side is defined as the second noise reduction plate 13b. See Appendix Figure 2 , 4 Figures 1 and 5 show the structure of the first noise reduction plate 13a and the second noise reduction plate 13b.

[0057] In this embodiment, the design of the flow-slowing hole 122 not only provides installation space for the noise reduction plate 13, but also the structure that the diameter of the flow-slowing hole 122 is larger than the diameter of the valve hole 121 allows the liquid flow (two-phase flow) to be fully mixed and uniform here, thereby reducing the noise during flow.

[0058] It should be noted that in this embodiment, the structure of the slow flow holes 122 at both ends of the valve core 12 can be set as stepped holes or as tapered holes, without specific limitation. The slow flow holes 122 at both ends of the valve core 12 can be set as the same hole type or as different hole type structures.

[0059] As one embodiment of this utility model, see the appendix. Figure 7 , Figure 14 , Figure 15 The noise reduction plate 13 has a plurality of through holes 133 circumferentially distributed around the axis of the noise reduction plate 13. The through holes 133 penetrate the noise reduction plate 13 and form a circumferentially closed structure. The plurality of through holes 133 together form the noise reduction channel.

[0060] In this embodiment, the through hole 133 is set on the inner side of the edge of the noise reduction plate 13 to form a circumferentially closed hole structure. Multiple through holes 133 together form a noise reduction channel, that is, each through hole 133 can achieve the effect of changing the liquid flow path mentioned above.

[0061] In actual setup, multiple through holes 133 can be arranged to be evenly distributed around the central axis of the noise reduction plate 13. This even distribution of through holes 133 can improve the uniformity of the liquid flow after passing through the noise reduction plate 13, thereby improving the stability of the liquid flow and helping to reduce noise and pressure balance during the liquid flow process.

[0062] In this embodiment, the specific number of through holes 133 is not specifically limited. In actual design, the number of noise reduction channels in this embodiment can also be set to 1, 2, 3... or more, without specific limitation.

[0063] However, to ensure the balance of fluid pressure, the number of noise reduction channels is generally no less than two. In actual installation, the number of through holes 133 can be designed according to the diameter of the noise reduction plate 13 (i.e., the inner diameter of the flow-slowing hole 122 or the valve body) and the diameter of the through holes 133. Generally, when the diameter of the noise reduction plate 13 is large or the diameter of the through holes 133 is small, the number of through holes 133 can be increased accordingly. See Appendix. Figure 7 , 14 The noise reduction plate 13 has a structure with 4 through holes 133 and 5 through holes 133, respectively.

[0064] As one embodiment of this utility model, see the appendix. Figures 8 to 13 The noise reduction plate 13 includes a plate body 131 and a plurality of protrusions 132. The plurality of protrusions 132 protrude from the outer side wall of the plate body 131 and are circumferentially spaced around the axis of the plate body 131. The gaps between adjacent protrusions 132 form the noise reduction channel.

[0065] In this embodiment, the outer side of the noise reduction plate 13 is configured with a tooth 132 structure (similar to a gear structure), wherein the gap between adjacent teeth 132 forms a noise reduction channel. In this embodiment, the noise reduction channel is located at the outer edge of the noise reduction plate 13, which causes a large radial displacement between the noise reduction channel and the valve hole 121, thereby improving the noise reduction environment and helping to reduce noise.

[0066] In this embodiment, the number of protruding teeth 132 is not specifically limited. In actual settings, the design can be optimized according to the diameter of the noise reduction plate 13.

[0067] In this embodiment, the specific cross-sectional shape of the protruding tooth 132 is not specifically limited. In actual setting, the axial cross-sectional shape of the protruding tooth 132 is set to at least one of rectangle, arc, triangle and trapezoid.

[0068] As attached Figure 8 , 9 As shown, the convex tooth 132 has a rectangular structure; as attached Figure 10 , 11 As shown, the convex tooth 132 is constructed in a triangular or V-shape; as attached Figure 12 , 13 As shown, the convex tooth 132 has an arc-shaped structure.

[0069] In actual setup, the protrusion 132 can be set to a single cross-sectional shape or a combination of multiple different cross-sectional shapes. Of course, in actual setup, the structure of the protrusion 132 can also be set to other shapes, such as wavy, elliptical, and sawtooth shapes, etc. There are no specific limitations on this, as long as it is ensured that an effective noise reduction channel can be constructed between adjacent protrusions 132.

[0070] As a specific embodiment of this utility model, the thickness of the noise reduction plate 13 is set to be between 0.5 mm and 2 mm.

[0071] As one embodiment of this utility model, see the appendix. Figure 10 , 12 14. A central hole 134 is formed on the noise reduction plate 13. The central hole 134 penetrates the noise reduction plate 13. The central hole 134 is coaxial with the valve hole 121. The diameter of the central hole 134 is smaller than the diameter of the valve hole 121.

[0072] In this embodiment, the noise reduction plate 13 has a central hole 134. The central hole 134 and the valve hole 121 are coaxial. The central hole 134 allows liquid flow through the noise reduction plate 13. In actual use, without the central hole 134, no liquid flows directly through the central area of ​​the side of the noise reduction plate 13 facing away from the liquid flow direction. The pressure here will differ from the pressure in the surrounding noise reduction channels of the noise reduction plate 13, resulting in pressure imbalance and noise. The design of the central hole 134 makes the liquid flow distribution more uniform when flowing through the noise reduction plate 13, and also makes the pressure of each part of the liquid flow basically balanced during the process of flowing through the noise reduction plate 13, which helps to reduce noise.

[0073] It should be noted that the above description of the noise reduction channel structure is based on the second noise reduction plate 13b as an example. In actual design, the noise reduction channel structure of the first noise reduction plate 13a and the second noise reduction plate 13b in this utility model can be set to be the same, except that the structure of the central part is different.

[0074] To enhance the stability and ease of installation of the noise reduction panel 13, please refer to the attached document. Figure 6 The inner wall of the flow-slowing orifice 122 is designed with a limiting platform 123. One end face of the noise reduction plate 13 is in close contact with the end face of the limiting platform 123, while its outer wall is in contact with the inner wall of the flow-slowing orifice 122. This ensures the stability of the noise reduction plate 13 when installed inside the valve core 12.

[0075] As one embodiment of this utility model, see the appendix. Figure 1 The valve body assembly 10 further includes a first connecting pipe 14 and a second connecting pipe 15. The first connecting pipe 14 is coaxially connected to the valve seat 11, and the second connecting pipe 15 is connected to the side wall of the valve seat 11 and communicates with the inner cavity of the valve seat 11. The valve core 12 is disposed between the first connecting pipe 14 and the second connecting pipe 15, and the second end of the valve core 12 is disposed inside the first connecting pipe 14.

[0076] In this embodiment, the first connecting pipe 14 and the second connecting pipe 15 can serve as the mounting base for pipeline components in the equipment. The expansion valve of this utility model can be conveniently connected to the liquid flow pipeline in the equipment through the first connecting pipe 14 and the second connecting pipe 15.

[0077] The second end of the valve core 12 is located inside the first connecting pipe 14. In this embodiment, during the production of the expansion valve, the noise reduction plate 13 and the valve core 12 can generally be assembled in advance, and then the assembly of the valve core 12 and the noise reduction plate 13 can be installed together in the valve body. Finally, the first connecting pipe 14 is sleeved on the outside of the valve core 12 and connected to the valve body.

[0078] The noise reduction principle of the noise reduction plate 13 has been explained above. In actual installation, under certain circumstances, the noise reduction plate 13 on the side away from the valve needle 20 can be placed directly inside the first connecting pipe 14, that is, the noise reduction plate 13 is firmly installed on the inner wall of the first connecting pipe 14, which can also achieve the expected noise reduction effect.

[0079] The above are merely specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. An expansion valve, comprising a valve body assembly (10) and a valve needle (20), the valve body assembly (10) comprising a valve seat (11) and a valve core (12), a first end of the valve core (12) being disposed within the valve seat (11), a valve hole (121) being formed on the valve core (12), the valve needle (20) being opposite to the valve hole (121) and capable of approaching or moving away from the valve hole (121) to adjust the opening degree of the expansion valve; characterized in that, The valve core (12) has two flow-slowing holes (122) at its two ends. The two flow-slowing holes (122) are located at opposite ends of the valve hole (121) and are connected to the valve hole (121). The diameter of the flow-slowing hole (122) is larger than the diameter of the valve hole (121). The valve body assembly (10) also includes a noise reduction plate (13) disposed in the flow-slowing hole (122). The noise reduction plate (13) is spaced from the valve hole (121). The noise reduction plate (13) located on the side of the valve needle (20) is provided with a through hole (135) that allows the valve needle (20) to pass through. The noise reduction plate (13) is provided with a noise reduction channel. The noise reduction channel, the flow-slowing hole (122) and the valve hole (135) are connected to each other.

2. The expansion valve according to claim 1, characterized in that, The noise reduction plate (13) has a plurality of through holes (133) circumferentially distributed around the axis of the noise reduction plate (13). The through holes (133) penetrate the noise reduction plate (13) and form a circumferentially closed structure. The plurality of through holes (133) together form the noise reduction channel.

3. The expansion valve according to claim 2, characterized in that, The number of through holes (133) is 2 to 10.

4. The expansion valve according to claim 1, characterized in that, The noise reduction plate (13) includes a plate body (131) and a plurality of protrusions (132). The plurality of protrusions (132) protrude from the outer side wall of the plate body (131) and are circumferentially spaced around the axis of the plate body (131). The gap between adjacent protrusions (132) forms the noise reduction channel.

5. The expansion valve according to any one of claims 1 to 4, characterized in that, The flow-slowing holes (122) at both ends of the valve core (12) have the same hole shape, or the flow-slowing holes (122) at both ends of the valve core (12) have different hole shapes.

6. The expansion valve according to any one of claims 1 to 4, characterized in that, The noise reduction plate (13) is made of metal and is welded or riveted to the valve core (12).

7. The expansion valve according to any one of claims 1 to 4, characterized in that, A central hole (134) is formed on the noise reduction plate (13), the central hole (134) penetrates the noise reduction plate (13), the central hole (134) is coaxial with the valve hole (121), and the diameter of the central hole (134) is smaller than the diameter of the valve hole (121).

8. The expansion valve according to any one of claims 1 to 4, characterized in that, A limiting stage (123) is formed on the inner wall of the slow flow hole (122), and the end face of the noise reduction plate (13) is fitted with the limiting stage (123). The outer wall of the noise reduction plate (13) abuts against the inner wall of the slow flow hole (122).

9. The expansion valve according to any one of claims 1 to 4, characterized in that, Multiple noise reduction plates (13) are provided inside the slow flow hole (122), and the multiple noise reduction plates (13) inside the same slow flow hole (122) are stacked or spaced apart.

10. The expansion valve according to any one of claims 1 to 4, characterized in that, The valve body assembly (10) further includes a first connecting pipe (14) and a second connecting pipe (15). The first connecting pipe (14) is coaxially connected to the valve seat (11), and the second connecting pipe (15) is connected to the side wall of the valve seat (11) and communicates with the inner cavity of the valve seat (11). The valve core (12) is disposed between the first connecting pipe (14) and the second connecting pipe (15), and the second end of the valve core (12) is disposed inside the first connecting pipe (14).

Images