An expansion valve

Abstract

This utility model discloses an expansion valve, belonging to the field of valve technology, including a valve body assembly, a valve core, and a valve needle. A fluid flow channel is formed within the valve body assembly. The valve core is disposed within the fluid flow channel and has a valve orifice. The valve needle is opposite to the valve orifice and can move closer to or further away from the valve orifice to adjust the opening degree of the expansion valve. The valve body assembly includes a noise-reducing sleeve disposed within the valve core. The noise-reducing sleeve includes a cylindrical portion and a flow-blocking portion. The first end of the cylindrical portion is configured as an open structure and communicates with the valve orifice. The second end of the cylindrical portion is away from the valve orifice and has the flow-blocking portion disposed thereon. The flow-blocking portion is spaced apart from the valve orifice. At least one noise-reducing channel is provided on the side wall of the cylindrical portion, and the inner cavity of the cylindrical portion and the fluid flow channel are connected through the noise-reducing channel. This utility model can reduce noise during use.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to an expansion valve. 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 existing expansion valves, the fluid 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. This is especially true in the case of two-phase flow (gas and liquid mixing), where 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, a valve core, and a valve needle, wherein a liquid flow channel is formed within the valve body assembly, the valve core is disposed within the liquid flow channel and has a valve hole, 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 body assembly includes a noise reduction sleeve disposed on the valve core. The noise reduction sleeve includes a cylindrical part and a flow-blocking part. The first end of the cylindrical part is configured as an open structure and communicates with the valve hole. The second end of the cylindrical part is away from the valve hole and is provided with the flow-blocking part. The flow-blocking part is disposed at a distance from the valve hole. At least one noise reduction channel is provided on the side wall of the cylindrical part. The inner cavity of the cylindrical part and the liquid flow channel are connected through the noise reduction channel.

[0007] In this technical solution, by setting a noise-reducing sleeve, the flow-blocking part on the noise-reducing sleeve will block the liquid in the liquid flow channel of the valve body assembly to a certain extent during the use of the expansion valve. The liquid flow will slow down under the action of the flow-blocking part, thereby reducing noise. In addition, a noise-reducing channel is opened on the side wall of the cylinder in this embodiment. During the flow process, the liquid will flow through the noise-reducing channel, which will change the flow path of the liquid flow, further slowing down the flow rate and reducing noise. The noise-reducing sleeve in this application is set on the valve core. During the production process, the noise-reducing sleeve and the valve core can be pre-assembled and then installed together into the valve body, which improves the convenience of installation.

[0008] Furthermore, the valve core is provided with a flow-slowing hole that communicates with the valve orifice. The diameter of the flow-slowing hole is larger than the diameter of the valve orifice. The first end of the cylindrical body extends into the flow-slowing hole and is fixedly connected to the valve core.

[0009] Furthermore, a positioning step is formed on the inner wall of the slow-flow hole, and the first end of the cylindrical part abuts against and is fixedly connected to the end face of the positioning step.

[0010] Furthermore, the noise reduction sleeve and the valve core are fixedly connected by at least one of welding and riveting.

[0011] Furthermore, the axis of the noise reduction channel intersects the axis of the valve orifice.

[0012] Furthermore, multiple noise reduction channels are provided, and these multiple noise reduction channels are circumferentially distributed around the axis of the cylindrical part.

[0013] Furthermore, the noise reduction channel is configured to extend through the first end of the cylindrical section.

[0014] Furthermore, the flow-blocking part is provided with a through hole, which communicates with the inner cavity of the cylindrical part.

[0015] Furthermore, the valve body assembly includes a valve seat, 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. The first end of the valve core is disposed in the valve seat, and the second end of the valve core extends into the first connecting pipe. The noise reduction sleeve is disposed at the second end of the valve core.

[0016] Furthermore, a portion of the cylindrical part is placed inside the first connecting pipe, and the outer wall of the cylindrical part is spaced from the inner wall of 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 1 This is a schematic cross-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 flow path (schematic diagram of liquid flow in the flow-blocking section without through holes);

[0021] Figure 3 This is a structural diagram of a noise reduction sleeve according to one embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the fluid flow at the valve core and noise reduction sleeve in one embodiment of the present invention (there is a through hole on the flow baffle);

[0023] Figure 5 This is a structural diagram of a noise reduction sleeve according to one embodiment of the present invention;

[0024] Figure 6 This is a schematic cross-sectional view of the expansion valve according to one embodiment of the present invention;

[0025] Figure 7 for Figure 6 Enlarged view of a portion of the image;

[0026] Figure 8 This is a structural diagram of a noise reduction sleeve according to one embodiment of the present invention (the flow-blocking part has a through hole);

[0027] Figure 9 This is a schematic diagram of the fluid flow at the valve core and noise reduction sleeve in one embodiment of the present invention;

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

[0029] Figure 11 This is a cross-sectional view of a noise reduction sleeve according to one embodiment of the present invention;

[0030] Figure 12 This is a cross-sectional view of a noise reduction sleeve according to one embodiment of the present invention.

[0031] in,

[0032] 10. Valve body assembly; 11. Valve seat; 12. Valve core; 121. Valve bore; 122. Flow retardant orifice; 123. Positioning step;

[0033] 13. First connecting pipe; 14. Second connecting pipe;

[0034] 20. Noise-reducing sleeve; 21. Cylinder body; 211. Noise-reducing channel; 22. Baffle; 221. Through hole;

[0035] 30. Valve needle;

[0036] 40. Rotor assembly; 41. Magnetic rotor; 42. Guide shaft; 43. Slip ring; 44. Stop rod;

[0037] 50. Outer shell. Detailed Implementation

[0038] 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.

[0039] 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.

[0040] See appendix Figure 1 , 6 One embodiment of this utility model discloses an expansion valve, including a valve body assembly 10, a valve core 12 and a valve needle 30. A liquid flow channel is formed in the valve body assembly 10. The valve core 12 is disposed in the liquid flow channel and has a valve hole 121. The valve needle 30 is opposite to the valve hole 121 and can move closer to or further away from the valve hole 121 to adjust the opening of the expansion valve.

[0041] The valve body assembly 10 includes a noise reduction sleeve 20 disposed on the valve core 12. The noise reduction sleeve 20 includes a cylindrical part 21 and a flow-blocking part 22. The first end of the cylindrical part 21 is configured as an open structure and communicates with the valve hole 121. The second end of the cylindrical part 21 is away from the valve hole 121 and is provided with the flow-blocking part 22. The flow-blocking part 22 is disposed at a distance from the valve hole 121. At least one noise reduction channel 211 is provided on the side wall of the cylindrical part 21. The inner cavity of the cylindrical part 21 and the liquid flow channel are connected through the noise reduction channel 211.

[0042] The expansion valve in this embodiment generally also includes a rotor assembly 40, a valve needle 30, and a housing 50. The rotor assembly 40 includes a magnetic rotor 41, a guide shaft 42, a slip ring 43, a stop rod 44, etc. The housing 50 is fixedly connected to the valve seat 11. The rotor assembly 40 is disposed inside the housing 50. The guide shaft 42 and the valve needle 30 are connected by components such as springs and spring support seats. During use, the rotation of the magnetic rotor 41 drives the guide shaft 42 to rotate accordingly. The guide shaft 42 further drives the valve needle 30 to perform linear motion, thereby adjusting the opening degree of the expansion valve. The slip ring 43 is disposed on the guide shaft 42 through a spiral guide. The stop rod 44 is used to cooperate with the slip ring 43 to limit the start and stop positions of the linear motion of the guide shaft 42.

[0043] In actual production, the valve core 12 is generally welded and fixed inside the valve seat 11 (the valve core 12 can be partially or completely placed inside the valve seat 11). The valve core 12 is provided with a valve hole 121 corresponding to the valve needle 30. The rotor assembly 40 drives the valve needle 30 to move linearly, causing the valve needle 30 to approach (insert) or move away from the valve hole 121.

[0044] In this embodiment, the rotor assembly 40 is used to communicate with the main control system of the refrigeration equipment or air conditioner when assembled with it, so as to automatically control the position of the valve needle 30 relative to the valve hole 121, control the opening of the expansion valve, and achieve precise control of the flow of the expansion valve.

[0045] The valve body assembly 10 in this embodiment includes a noise reduction sleeve 20, which mainly reduces the flow noise of the liquid by reducing the flow velocity of the liquid in the liquid flow channel, changing the flow path of the liquid, reducing turbulence and vibration.

[0046] Specifically, the noise reduction sleeve 20 in this embodiment includes a cylindrical body 21 and a flow-blocking part 22, see attached drawing. Figure 3 , 5 8, 10, wherein the cylinder body 21 and the valve hole 121 are generally coaxially arranged. In this embodiment, the first end of the cylinder body 21 is an open structure for the passage of liquid flow. The flow-blocking part 22 is arranged at the second end of the cylinder body 21 and blocks the second end of the cylinder body 21, thereby blocking the liquid flow. In actual use, as shown in the attached... Figure 2 As shown, taking the flow of liquid from the second end to the first end of the noise reduction sleeve 20 as an example ( Figure 2 (From bottom to top) When the liquid flows to the position of the noise reduction sleeve 20, the liquid cannot pass directly through the noise reduction sleeve 20 along the axial direction because the second end of the cylinder 21 is blocked by the flow-blocking part 22.

[0047] In this embodiment, a noise reduction channel 211 is provided on the side wall of the cylinder 21. When the liquid flows to the noise reduction sleeve 20, it will flow through the noise reduction channel 211. At this time, the flow direction of the liquid changes. It changes from flowing along the axial direction to flowing radially when passing through the noise reduction channel 211. The change in flow direction will slow down the flow speed of the liquid, thereby reducing the noise of the liquid flow.

[0048] It should be noted that the function of the flow-blocking part 22 in this embodiment is to block the flow of liquid along the axial direction. In actual design, the flow-blocking part 22 can be a completely closed structure, making it impossible for liquid to pass through at all. Alternatively, it can be set to have only a partial blocking effect as needed. That is, in this case, the flow-blocking part 22 only allows a part of the liquid to flow directly through the flow-blocking part 22 along the axial direction, while blocking the other part of the liquid. In this case, it can also achieve the effect of slowing down the liquid flow. No specific limitation is made.

[0049] In this embodiment, the flow-blocking part 22 and the cylinder part 21 can be designed as an integral structure or as separate structures (separate structures are used after assembly).

[0050] See appendix Figure 2 , 4 In this embodiment, the opening at the first end of the cylindrical part 21 is located near the valve hole 121 and communicates with the valve hole 121. Correspondingly, the flow-blocking part 22 is located away from the valve hole 121. In this way, during use, the cavity between the inner cavity of the cylindrical part 21 and the cavity between the valve hole 121 will form a mixing cavity. When the liquid flows into the inner cavity of the cylindrical part 21 through the noise reduction channel 211, the flow rate of the liquid will decrease due to the sudden increase in the flow cross section. Moreover, in this mixing cavity, the mixing of the two-phase flow (gas and liquid) will be more complete, further improving the noise reduction effect.

[0051] In this embodiment, the cylindrical part 21 can be configured as a straight cylinder structure, or as a conical cylinder structure as needed, or as a structure combining a conical cylinder and a straight cylinder. No specific limitation is made in this regard.

[0052] In this embodiment, the location and form of the noise reduction channel 211 are not specifically limited. In actual installation, the noise reduction channel 211 can be configured as a mechanism with closed edges on all four sides (see Appendix). Figure 8 , 10 Alternatively, it could be one end of the cylinder section 21 that penetrates from one side (see Appendix). Figure 3 , 5 The specific shape of the noise reduction channel 211 can be set to a circle, ellipse, square, triangle and other shapes, as long as the liquid flow can pass through.

[0053] In this embodiment, the specific number and size of the noise reduction channels 211 are not specifically limited. In actual settings, the number of noise reduction channels 211 can be set to 1, 2, 3 or more. Specifically, it can be selected according to the inner diameter of the valve body and the size of the noise reduction channels 211. Generally, the inner diameter of the valve body is large. With a fixed size of the noise reduction channels 211, more channels can be set to ensure the stability of the liquid flow.

[0054] In this embodiment, the noise reduction sleeve 20 can not only reduce the flow rate of the liquid, but also, when in use, the liquid will change its flow direction after hitting the baffle in the inner cavity, and will also make the liquid more uniformly mixed in the inner cavity of the cylinder 21, especially for two-phase flow.

[0055] In this embodiment, the noise reduction sleeve 20 is disposed on the valve core 12. In actual installation, the connection method between the noise reduction sleeve 20 and the valve core 12 can be set as welding connection, riveting connection or snap connection, etc. The specific connection structure is not specifically limited. During the assembly process, the noise reduction sleeve 20 and the valve core 12 can be pre-assembled outside the valve body assembly 10 and then installed together into the valve body assembly 10, which reduces the workload of installing the valve core 12 and the noise reduction sleeve 20 into the valve body assembly 10 separately (the internal space of the valve body assembly 10 is small and the assembly is somewhat difficult), and improves production efficiency.

[0056] As one embodiment of this utility model, see the appendix. Figure 2 The valve core 12 is provided with a slow-flow hole 122 that communicates with the valve hole 121. The diameter of the slow-flow hole 122 is larger than the diameter of the valve hole 121. The first end of the cylinder part 21 extends into the slow-flow hole 122 and is fixedly connected to the valve core 12.

[0057] In this embodiment, the valve core 12 is provided with a flow-retarding hole 122 with a diameter larger than that of the valve orifice 121. One end of the opening of the cylindrical body 21 is connected to the valve orifice 121 through the flow-retarding hole 122. During operation, the flow cross-section of the liquid in the inner cavity of the cylindrical body 21 and at the flow-retarding hole 122 suddenly increases, which slows down the flow rate and makes the liquid flow mix more evenly at this point. In this embodiment, one end of the cylindrical body 21 extends into the flow-retarding hole 122, as shown in the attached figure. Figure 2 , 4 As shown, in actual assembly, in order to fix the noise reduction sleeve 20 and the valve core 12, the outer wall of the cylindrical part 21 can be fixedly connected to the outer wall of the slow flow hole 122, or the end of the cylindrical part 21 can be fixedly connected to the structure of the valve core 12 inside the slow flow hole 122. Of course, the outer wall and the end of the cylindrical part 21 can be connected to the valve core 12 at the same time.

[0058] As one embodiment of this utility model, see the appendix. Figure 2 , 4 A positioning step 123 is formed on the inner wall of the slow flow hole 122, and the first end of the cylindrical part 21 abuts against and is fixedly connected to the end face of the positioning step 123.

[0059] In this embodiment, a positioning step 123 is formed inside the flow-slowing hole 122. The positioning step 123 can, on the one hand, position the relative position of the noise-reducing sleeve 20 and the valve core 12. On the other hand, the end face of the positioning step 123 abuts against the end face of the cylinder part 21, which can improve the stability of the noise-reducing sleeve 20 during installation.

[0060] In one embodiment of this utility model, the axis of the noise reduction channel 211 intersects the axis of the valve hole 121. In this embodiment, the axis of the noise reduction channel 211 intersects the axis of the cylinder portion 21. In actual installation, the angle of intersection can be set to 90° (see Appendix). Figure 8 , 10 (As shown), it can also be set to other angles, such as less than 90° or greater than 90°, etc. (as shown in the attached image). Figure 11 , 12 (As shown), no specific limitations are made in this regard.

[0061] As one embodiment of this utility model, see the appendix. Figure 3 , 5 8, 10, multiple noise reduction channels 211 are provided, and the multiple noise reduction channels 211 are circumferentially distributed around the axis of the cylindrical part 21.

[0062] In this embodiment, during the use of the expansion valve, the liquid flow flows through the noise reduction channel 211 from multiple different directions around the valve core 12, resulting in a more uniform distribution of the liquid flow, which helps to improve the stability of the liquid flow and reduce noise.

[0063] In this embodiment, the structure of multiple noise reduction channels 211 can increase the flow area of ​​the fluid, thereby reducing the flow velocity. Of course, in actual settings, the number of noise reduction channels 211 can be set to 3, 4, 5, 6, or even more, or it can be set to one. For example, the design can be optimized according to the size of the valve core 12. If the diameters of the valve seat 11 and the valve core 12 are large, then a larger number of noise reduction channels 211 can be set accordingly.

[0064] As one embodiment of this utility model, see the appendix. Figure 5 , 8 The flow-blocking part 22 is provided with a through hole 221, which communicates with the inner cavity of the cylindrical part 21.

[0065] In this embodiment, the flow-blocking part 22 is provided with a through hole 221. During use, when the liquid flow in the valve body assembly 10 passes through the flow-blocking part 22, it can pass through the through hole 221 on the flow-blocking part 22 and then through the valve core 12. That is, at this time, the liquid flow can pass through the valve core 12 through two different paths, as shown in the attached figure. Figure 4 , 7 As shown, in this embodiment, the liquid flow through the through hole 221 makes the distribution of the liquid flow in all directions when flowing through the valve core 12 more uniform, so that the pressure of each part of the liquid flow is basically balanced, which helps to reduce noise.

[0066] In this embodiment, the distribution position of the through hole 221 on the flow-blocking part 22 is not specifically limited. In actual installation, the through hole 221 can be set at the center of the flow-blocking part 22, and the through hole 221 and the valve hole 121 are coaxially arranged. The through hole 221 can also be set at a position that is offset from the center of the flow-blocking part 22.

[0067] In addition, in actual setup, this embodiment does not specifically limit the number of through holes 221 on the flow baffle 22. In actual setup, the through holes 221 on the flow baffle 22 can be set to multiple, and the multiple through holes 221 can generally be evenly distributed on the flow baffle 22.

[0068] As one embodiment of this utility model, see the appendix. Figure 4 The valve core 12 of this utility model is provided with 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 design of the two flow-slowing holes 122 can play a dual noise reduction effect on the liquid flow during use.

[0069] It should be noted that the description here only describes the speed reduction effect of the fluid flow through the valve core 12 and the noise reduction sleeve 20. For actual settings, please refer to the appendix. Figure 1 , 6 A larger cavity can be formed inside the valve seat 11. After the liquid flows into this cavity, it also has a deceleration effect (due to the sudden increase in the flow cross section), which will not be elaborated here.

[0070] As one embodiment of this utility model, see the appendix. Figure 1 , 6 The valve body assembly 10 includes a valve seat 11, a first connecting pipe 13, and a second connecting pipe 14. The first connecting pipe 13 is coaxially connected to the valve seat 11, and the second connecting pipe 14 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 13 and the second connecting pipe 14. The first end of the valve core 12 is disposed inside the valve seat 11, and the second end of the valve core 12 extends into the first connecting pipe 13. The noise reduction sleeve 20 is disposed at the second end of the valve core 12.

[0071] In this embodiment, the first connecting pipe 13 and the second connecting pipe 14 can serve as the installation 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 13 and the second connecting pipe 14.

[0072] In this invention, during assembly, a portion of the valve core 12 is housed within the valve seat 11, while the other portion is housed within the first connecting pipe 13. In actual installation, the end of the first connecting pipe 13 is positioned at the point where it connects to the valve seat 11, with a larger diameter. This facilitates the connection between the first connecting pipe 13 and the valve seat 11 and provides more installation space for the portion of the valve core 12 and noise-reducing sleeve 20 housed within the first connecting pipe 13, making assembly easier. Furthermore, the location of a portion of the valve core 12 and noise-reducing sleeve 20 within the first connecting pipe 13 also facilitates maintenance. When maintenance is required, simply detach the first connecting pipe 13 from the valve seat 11 to expose the valve core 12 and noise-reducing sleeve 20 for easy access.

[0073] In this embodiment, the portion of the cylindrical part 21 placed inside the first connecting pipe 13 forms a gap with the outer wall of the first connecting pipe 13, as shown in the attached figure. Figure 2 , 4 As shown, during use, when the liquid flows through the noise reduction sleeve 20, it passes through the gap between the outer wall of the cylinder 21 and the inner wall of the first connecting pipe 13 and enters the noise reduction channel 211.

[0074] Of course, in actual setup, the noise reduction sleeve 20 and valve core 12 can also be completely placed inside the valve seat 11.

[0075] A portion of the cylindrical part 21 of this invention is placed inside the first connecting pipe 13, and the outer wall of the cylindrical part 21 is spaced from the inner wall of the first connecting pipe 13.

[0076] The expansion valve in this embodiment can be applied in air conditioning systems, refrigeration and freezing equipment, and heat pump systems in actual use.

[0077] 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 (30), the valve body assembly (10) comprising a valve seat (11) and a valve core (12), the valve seat (11) having a fluid flow channel formed thereon, the valve core (12) being disposed within the fluid flow channel and having a valve hole (121), the valve needle (30) 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 expansion valve also includes a noise reduction sleeve (20) disposed on the valve core (12). The noise reduction sleeve (20) includes a cylindrical part (21) and a flow-blocking part (22). The first end of the cylindrical part (21) is configured as an open structure and communicates with the valve hole (121). The second end of the cylindrical part (21) is away from the valve hole (121) and is provided with the flow-blocking part (22). The flow-blocking part (22) is disposed at a distance from the valve hole (121). At least one noise reduction channel (211) is provided on the side wall of the cylindrical part (21). The inner cavity of the cylindrical part (21) and the liquid flow channel are connected through the noise reduction channel (211).

2. The expansion valve according to claim 1, wherein The valve core (12) is provided with a slow-flow hole (122) that communicates with the valve hole (121). The diameter of the slow-flow hole (122) is larger than the diameter of the valve hole (121). The first end of the cylindrical part (21) extends into the slow-flow hole (122) and is fixedly connected to the valve core (12).

3. The expansion valve of claim 2, wherein A positioning step (123) is formed on the inner wall of the slow flow hole (122), and the first end of the cylindrical part (21) abuts against and is fixedly connected to the end face of the positioning step (123).

4. The expansion valve according to any one of claims 1 to 3, characterized in that, The noise reduction sleeve (20) and the valve core (12) are fixedly connected by at least one of welding and riveting.

5. The expansion valve according to any one of claims 1 to 3, characterized in that The axis of the noise reduction channel (211) intersects the axis of the valve hole (121).

6. The expansion valve according to any one of claims 1 to 3, characterized by Multiple noise reduction channels (211) are provided, and the multiple noise reduction channels (211) are circumferentially distributed around the axis of the cylindrical part (21). The specific shape of the noise reduction channel (211) includes at least one of the following: circle, ellipse, square and triangle.

7. The expansion valve according to any one of claims 1 to 3, characterized by The noise reduction channel (211) is configured to extend through the first end of the cylindrical part (21).

8. The expansion valve according to any one of claims 1 to 3, characterized by The flow-blocking part (22) is provided with a through hole (221), which is connected to the inner cavity of the cylindrical part (21).

9. The expansion valve according to any one of claims 1 to 3, characterized by The valve body assembly (10) includes a valve seat (11), a first connecting pipe (13), and a second connecting pipe (14). The first connecting pipe (13) is coaxially connected to the valve seat (11), and the second connecting pipe (14) 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 (13) and the second connecting pipe (14). The first end of the valve core (12) is disposed inside the valve seat (11), and the second end of the valve core (12) extends into the first connecting pipe (13). The noise reduction sleeve (20) is disposed at the second end of the valve core (12).

10. The expansion valve according to claim 9, wherein A portion of the cylindrical body portion (21) is disposed in the first connecting pipe (13), and the outer wall of the cylindrical body portion (21) and the inner wall of the first connecting pipe (13) form a space.

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