Variable throttle valve with noise reduction function

Abstract

The utility model relates to a variable throttle valve with a noise reduction function, comprising: a valve seat, which is internally provided with a through channel and one end of which is molded with a valve port part; the valve sleeve and the valve seat are arranged in a relatively static mode, a through channel is formed in the valve sleeve, and the channel is communicated with the channel in the valve seat; the valve element is mounted in the valve sleeve in an axial moving manner and can be attached to the valve port part or separated from the valve port part so as to realize on-off of fluid; the spacer bush structure is arranged in the valve element, the spring is arranged outside the spacer bush, effective isolation of fluid and the spring is achieved structurally, and the problems of flow disturbance and structural resonance caused by the fact that the spring is exposed in a circulation path in a traditional structure are solved. Therefore, the problem of noise generated in the flowing process of the fluid is obviously reduced; meanwhile, the spacer bush is provided with a balance hole and an end through hole, so that the fluid can form a relatively stable pressure field in an internal cavity, fluid disturbance and airflow pulsation are further reduced, and noise is effectively relieved.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to a variable throttle valve with noise reduction function. Background Technology

[0002] In fluid control systems, throttle valves and check valves are two common types of valves. Throttle valves are mainly used to regulate fluid velocity and flow rate, while check valves are used to control fluid flow in only one direction. To achieve functional integration and compact structure, some technical solutions combine throttle valves and check valves to form a dual-function combined valve. This allows for both flow regulation and one-way check within limited installation space, making it widely used in hydraulic, pneumatic, and air conditioning piping systems.

[0003] For example, Chinese utility model patent application number CN202420258812.5 discloses a bidirectional throttling valve, integrating the functions of a check valve and a throttling valve. However, to provide valve core reset during throttling operation, a spring is installed inside. Since the spring is usually located within the fluid channel, it not only obstructs fluid flow and increases system flow resistance loss, but also easily generates significant vibration and structural resonance under high-pressure, high-speed fluid impact, resulting in considerable noise. These problems not only affect the valve's response sensitivity and operational stability, but also, to some extent, limit the application of combined valves in low-noise or high-precision control applications. Utility Model Content

[0004] To address the problems of fluid obstruction and significant noise generated by the spring in the combined throttle valve mentioned in the background art, this application provides a variable throttle valve with noise reduction function.

[0005] The variable throttle valve with noise reduction function provided in this application adopts the following technical solution:

[0006] A variable throttle valve with noise reduction function includes:

[0007] The valve seat has a through channel inside and a valve port formed at one end.

[0008] The valve sleeve is stationary relative to the valve seat, and has a through channel inside, which is connected to the internal channel of the valve seat.

[0009] The valve core is axially movable and installed inside the valve sleeve, and is configured to fit with or separate from the valve port to realize the flow and disconnection of fluid.

[0010] A throttling assembly includes a movable seat axially movable inside a valve core, a spring installed between the movable seat and the end wall of the valve core, a spacer installed on the movable seat, and the spring sleeved outside the spacer.

[0011] By adopting the above technical solution, a spacer is set inside the valve core to isolate the spring, which can prevent the spring from being directly exposed to the main flow path of the fluid. This can effectively reduce the direct contact between the fluid and the spring when it passes through, which can not only prevent the fluid from flowing under obstruction, but also reduce flow noise, thus improving the stability and quietness of the valve during operation.

[0012] Optionally, the end of the spacer passes through the end of the valve core and extends toward the valve port, with the outer wall of the spacer slidingly engaging with the end face of the valve core.

[0013] By adopting the above technical solution, the fluid can be guided to flow smoothly. At the same time, in terms of structure, on the one hand, a seal is formed on the valve core port to prevent the fluid from flowing into the spring chamber from the contact part between the spacer and the valve core. On the other hand, the valve core can also be used to guide the spacer, avoid the spacer from shaking, and enhance the working accuracy of the valve.

[0014] Optionally, the spacer sleeve has a balance hole in the circumferential direction, which connects the inner cavity of the spacer sleeve with the chamber where the spring is located.

[0015] By adopting the above technical solution, fluid can enter the area where the spring is located from the balance hole, so that the pressure inside and outside the spacer is balanced. This helps to eliminate the air resistance or pressure fluctuation that may be formed in the spring cavity, thereby maintaining the stability of the valve core action and further reducing noise. At the same time, it can also prevent the spacer from deforming.

[0016] Optionally, it also includes a valve tube, which is connected to the internal channel of the valve seat. A flow passage is formed between the outer wall of the valve sleeve and the inner wall of the valve tube. The valve sleeve has a side wall hole in the circumferential direction. When the valve core is in contact with the valve port, the valve core can isolate the inner cavity of the valve seat from the flow passage. When the valve core is separated from the valve port, the side wall hole can connect the inner cavity of the valve seat with the flow passage.

[0017] By adopting the above technical solution, after the valve core is opened, the fluid can enter the flow channel through the side wall hole and continue to flow forward, ensuring a smooth path.

[0018] Optionally, the throttling assembly further includes a fixed seat installed at the end of the valve core, the fixed seat having a throttling hole at its center, the movable seat having a valve needle matching the throttling hole installed in its center, and the movable seat having a guide channel for communicating the throttling hole with the inner cavity of the spacer.

[0019] By adopting the above technical solution, the flow rate can be adjusted by changing the gap between the valve needle and the throttling orifice. In the throttling working state, the fluid can enter the valve core through the throttling orifice, and then enter the inner cavity of the diaphragm through the guide channel. Finally, it continues to flow into the inner cavity of the valve seat along the axis of the diaphragm, thus achieving a variable throttling effect.

[0020] Optionally, the structure of the flow guiding channel includes, but is not limited to, the following:

[0021] The flow channel is a through hole that is formed in the thickness direction of the movable seat and extends through it;

[0022] The flow channel is a through groove formed on the outer wall of the movable seat and extending along its thickness direction.

[0023] By adopting the above technical solutions, we can adapt to different pressure and flow control requirements, thereby enhancing the applicability and ease of processing of the device.

[0024] Optionally, the end of the valve sleeve away from the valve port has a constricted portion that bends towards the center. The minimum inner diameter of the constricted portion is smaller than the outer diameter of the valve core, which is configured to prevent the valve core from detaching from the valve sleeve.

[0025] By adopting the above technical solution, the constricted part can be used to axially limit the valve core, effectively preventing the valve core from coming out of the valve sleeve during operation, and improving the safety and durability of the overall structure.

[0026] Optionally, the spacer has an end through hole at one end near the valve port, and the end through hole includes, but is not limited to, any of the following:

[0027] The end through hole is a single through hole opened at the end of the spacer sleeve;

[0028] The end through holes are multiple evenly distributed small holes opened at the end of the spacer;

[0029] The end through holes are multiple evenly distributed strip holes opened at the end of the spacer sleeve, with adjacent strip holes connected to each other near the center of the spacer sleeve.

[0030] By adopting the above technical solution, different forms of through-hole structures are set at the end of the spacer, which makes the fluid flow more smoothly when entering or leaving the spacer. At the same time, the porous structure also helps to reduce noise and improve fluid stability.

[0031] Optionally, the spacer is a straight-through cylindrical structure; or

[0032] The spacer has a stepped structure, and its diameter gradually decreases from the end away from the valve port to the end closer to the valve port.

[0033] By adopting the above technical solutions, the shape of the septum can be flexibly selected according to the actual working conditions. The straight structure is easy to manufacture and clean, while the stepped structure is conducive to flow rate guidance and flow distribution, thereby enhancing the throttling effect.

[0034] Optionally, the connection structure between the spacer and the movable seat includes, but is not limited to, the following:

[0035] The end of the spacer abuts against and connects to the end of the movable seat;

[0036] The end of the movable seat has a convex ring extending outward along the axial direction, and the spacer is sleeved inside or outside the convex ring and fixedly connected to the movable seat.

[0037] The end of the spacer is fitted onto the outer wall of the movable seat and is fixedly connected to the movable seat.

[0038] By adopting the above technical solutions, various connection methods between the spacer and the movable seat are provided, such as end abutment, sleeve, and snap-fit ​​structures, which enhance the reliability of the connection and the flexibility of processing and assembly, adapt to the working needs under actual production conditions, and at the same time ensure the overall structural stability of the throttling component.

[0039] Optionally, the throttling assembly further includes a fixed seat installed at the end of the valve core, a valve needle is installed at the center of the fixed seat, and a through guide hole is opened at the end of the fixed seat. A throttling hole matching the valve needle is opened at the center of the movable seat. When the movable seat moves axially, it can cooperate with the valve needle to adjust the flow rate through the throttling hole.

[0040] By adopting the above technical solution, a reliable axial throttling structure is formed by installing the valve needle in the center of the fixed seat and adjusting it with the throttling hole of the movable seat. This avoids the valve needle jitter problem caused by valve needle movement, effectively controls the flow rate, and reduces vibration and noise caused by fluid disturbance.

[0041] Optionally, a filter screen is also included, which is installed at both ends inside the valve tube and faces each other, with the valve seat and valve sleeve located between the two filter screens.

[0042] By adopting the above technical solutions, impurities can be effectively intercepted, the valve core and throttling components can be protected from contamination or wear, and the overall service life and operational stability of the valve system can be improved.

[0043] In summary, this application includes at least one of the following beneficial technical effects:

[0044] This invention achieves effective isolation between the fluid and the spring by setting a spacer structure inside the valve core and placing the spring outside the spacer. This avoids the flow disturbance and structural resonance problems caused by the spring being exposed in the flow path in traditional structures, thereby significantly reducing the noise generated by the fluid during flow. At the same time, the spacer is provided with a balance hole and an end through hole, which allows the fluid to form a relatively stable pressure field in the internal chamber, further reducing fluid disturbance and airflow pulsation, and effectively alleviating noise generation. Attached Figure Description

[0045] Figure 1This is the working state of Embodiment 1 of this utility model. Figure 1 ;

[0046] Figure 2 This is the working state of Embodiment 1 of this utility model. Figure 2 ;

[0047] Figure 3 This is the working state of Embodiment 1 of this utility model. Figure 3 ;

[0048] Figure 4 This is a perspective view of the spacer according to Embodiment 1 of this utility model;

[0049] Figure 5 This is a perspective view of the spacer sleeve in Embodiment 2 of this utility model;

[0050] Figure 6 This is a perspective view of the partition sleeve in Embodiment 3 of this utility model;

[0051] Figure 7 This is a structural diagram of Embodiment 4 of this utility model;

[0052] Figure 8 This is a structural diagram of Embodiment 5 of this utility model;

[0053] Figure 9 This is a structural diagram of Embodiment Six of this utility model;

[0054] Figure 10 This is a structural diagram of Embodiment Seven of this utility model;

[0055] Figure 11 This is a cross-sectional view of Embodiment Seven of this utility model;

[0056] Figure 12 This is a perspective view of the valve core and its throttling assembly according to Embodiment Seven of this utility model;

[0057] Figure 13 This is a perspective view of the connection between the movable seat and the valve needle in Embodiment 7 of this utility model;

[0058] Figure 14 This is a structural diagram of embodiment eight of this utility model;

[0059] Figure 15 This is a structural diagram of Embodiment Nine of this utility model;

[0060] Figure 16 This is a structural diagram of Embodiment 10 of this utility model;

[0061] Figure 17 This is a structural diagram of Embodiment Eleven of this utility model;

[0062] Figure 18 This is a structural diagram of embodiment twelve of this utility model;

[0063] Figure 19 This is a structural diagram of embodiment thirteen of this utility model.

[0064] Explanation of reference numerals in the attached figures:

[0065] 1. Valve pipe;

[0066] 2. Filter screen;

[0067] 3. Valve seat; 301. Valve port;

[0068] 4. Spacer; 401. Balance hole; 402. End through hole;

[0069] 5. Spring;

[0070] 6. Valve core;

[0071] 7. Movable seat; 701. Flow guide channel; 702. Convex ring;

[0072] 8. Fixing base; 801. Flow guide hole;

[0073] 9. Valve sleeve; 901. Side wall hole; 902. Narrowing section;

[0074] 10. Valve needle;

[0075] 11. Flow channel. Detailed Implementation

[0076] The present application will be further described in detail below with reference to the accompanying drawings.

[0077] Example 1

[0078] like Figure 1-4 As shown in the figure, this application discloses a variable throttle valve with noise reduction function, comprising:

[0079] The valve seat 3 has a through channel inside and a valve port 301 formed at one end. In this example, the valve port 301 has a flared trumpet-shaped structure. When the valve core 6 moves, it can abut against the inner wall of the valve port 301 to achieve the valve closing effect. In addition, in other embodiments, the valve port 301 can also be designed as a straight-through structure. The valve core 6 can also achieve the valve closing effect when it moves to the end wall of the valve port 301.

[0080] The valve sleeve 9 is stationary relative to the valve seat 3, and has a through channel inside, which is connected to the internal channel of the valve seat 3. In this example, the valve sleeve 9 and the valve seat 3 are integrally formed. In other embodiments, the valve seat 3 and the valve seat 3 can be designed as separate structures and connected and fixed by welding or threaded connection.

[0081] The valve core 6 is axially movable and installed inside the valve sleeve 9, and is configured to be able to fit with or separate from the valve port 301 to realize the flow and disconnection of fluid.

[0082] The throttling assembly includes a movable seat 7 axially movable inside the valve core 6, a spring 5 installed between the movable seat 7 and the end wall of the valve core 6, and a spacer 4 installed on the movable seat 7. The spring 5 is sleeved outside the spacer 4, wherein the end of the spacer 4 passes through the end of the valve core 6 and extends toward the valve port 301. The outer wall of the spacer 4 slides with the end face of the valve core 6, that is, when the movable seat 7 is in the extreme position away from the valve port 301, the spacer 4 still extends toward the outside of the valve core 6, which serves to guide the structure and prevent the spacer 4 from shifting.

[0083] In this example, the spacer 4 has a balance hole 401 in the circumferential direction. The balance hole 401 connects the inner cavity of the spacer 4 with the chamber where the spring 5 is located. Specifically, there are multiple balance holes 401 and they are evenly distributed around the center of the spacer 4. This allows some fluid to enter the chamber where the spring 5 is located outside the spacer 4, so that the pressure inside and outside the spacer 4 is balanced. This can prevent the spacer 4 from deforming and avoid the problem of damage to the components caused by pressure changes in the chamber where the spring 5 is located when the spacer 4 moves.

[0084] In this example, a valve tube 1 is also included, which communicates with the internal channel of the valve seat 3. A flow channel 11 is formed between the outer wall of the valve sleeve 9 and the inner wall of the valve tube 1. The valve sleeve 9 has a side wall hole 901 in the circumferential direction. When the valve core 6 is in contact with the valve port 301, the valve core 6 can isolate the inner cavity of the valve seat 3 from the flow channel 11. When the valve core 6 is separated from the valve port 301, the side wall hole 901 can connect the inner cavity of the valve seat 3 with the flow channel 11. Multiple side wall holes 901 are evenly distributed around the center of the valve sleeve 9. When the valve core 6 moves to... Figure 1 When the valve core 6 is in the position shown that it is in contact with the valve port 301, the inner cavity of the valve seat 3 is isolated from the flow passage 11; when the valve core 6 moves to the position shown, the valve seat 3 is isolated from the flow passage 11. Figure 2 When the valve is positioned away from the valve port 301, the inner cavity of the valve seat 3 is connected to the flow passage 11. At this time, fluid can flow from the inner cavity of the valve seat 3 through the side wall hole 901 into the flow passage 11 and continue to flow downward from the flow passage 11, thereby realizing the function of a one-way valve.

[0085] In this example, the throttling assembly also includes a fixed seat 8 installed at the end of the valve core 6. A throttling orifice is provided at the center of the fixed seat 8. A valve needle 10 matching the throttling orifice is installed in the middle of the movable seat 7. A flow guide channel 701 is provided on the movable seat 7 to connect the throttling orifice with the inner cavity of the spacer 4. Figure 3 As shown, when valve core 6 moves to the position shown... Figure 3When the valve seat 3 is in contact with the valve port 301 as shown, the inner cavity of the valve seat 3 is isolated from the flow passage 11. At this time, when the upward flow pressure of the fluid is less than the elastic force of the spring 5, the throttling orifice is closed by the valve needle 10. When the fluid force is greater than the elastic force of the spring 5, the spring 5 is compressed and the valve needle 10 is disengaged from the throttling orifice, so that the fluid can pass through the throttling orifice, the flow guide channel 701, and the inner cavity of the spacer 4 before entering the valve seat 3, thus realizing the function of variable throttling.

[0086] In this example, the flow channel 701 is a through hole that is formed in the thickness direction of the movable seat 7 and extends through it. There are multiple through holes that are evenly distributed around the center of the movable seat 7.

[0087] In this example, the end of the valve sleeve 9 away from the valve port 301 has a constricted portion 902 that bends towards the center. The minimum inner diameter of the constricted portion 902 is smaller than the outer diameter of the valve core 6, which is set to prevent the valve core 6 from detaching from the valve sleeve 9. In addition, in other embodiments, a limiting ring can also be provided at the end of the valve core 6 to prevent the valve core 6 from detaching, which can also play the role of axially limiting the valve core 6.

[0088] In this example, the end of the spacer 4 near the valve port 301 is provided with an end through hole 402. The end through hole 402 is a single through hole opened at the end of the spacer 4, and the through hole is consistent with the inner cavity size of the spacer 4.

[0089] In this example, the spacer 4 is a straight cylindrical structure. The end of the spacer 4 abuts against and connects to the end of the movable seat 7. Specifically, the connection and fixation between the spacer 4 and the movable seat 7 can be achieved by welding.

[0090] In this example, a filter screen 2 is also included, which is installed inside the valve tube 1 at both ends and facing each other. The valve seat 3 and the valve sleeve 9 are located between the two filter screens 2.

[0091] Example 2

[0092] like Figure 5 As shown, the only difference between this embodiment and the first embodiment above is that the end through hole 402 of the spacer 4 is a plurality of evenly distributed small holes opened at the end of the spacer 4, and the porous structure can achieve the effect of noise reduction.

[0093] Example 3

[0094] like Figure 6 As shown, the only difference between this embodiment and the first embodiment above is that the end through hole 402 of the spacer 4 is a plurality of evenly distributed strip holes opened at the end of the spacer 4, and two adjacent strip holes are connected to each other near the center of the spacer 4.

[0095] Example 4

[0096] like Figure 7As shown, the only difference between this embodiment and the first embodiment above is that the spacer 4 has a stepped structure, and its diameter gradually decreases from the end away from the valve port to the end closer to the valve port.

[0097] Example 5

[0098] like Figure 8 As shown, the only difference between this embodiment and the above embodiment four is that the connection method between the spacer 4 and the movable seat 7 is different. In this example, the end of the movable seat 7 has a convex ring 702 extending outward along the axial direction, and the spacer 4 is sleeved inside the convex ring 702 and fixedly connected to the movable seat 7.

[0099] Example 6

[0100] like Figure 9 As shown, the only difference between this embodiment and the above embodiment five is that the connection method between the spacer 4 and the movable seat 7 is different. In this example, the end of the movable seat 7 has a convex ring 702 extending outward along the axial direction, and the spacer 4 is sleeved on the outside of the convex ring 702 and fixedly connected to the movable seat 7.

[0101] Example 7

[0102] like Figure 10-13 As shown, the only difference between this embodiment and the above embodiment four is that the connection method between the spacer 4 and the movable seat 7 is different. In this example, the end of the spacer 4 is sleeved on the outer wall of the movable seat 7 and fixedly connected to the movable seat 7.

[0103] In this example, the flow channel 701 on the movable seat 7 is a through groove opened on the outer wall of the movable seat 7 and extending along its thickness direction. The through grooves are evenly distributed around the center of the movable seat 7.

[0104] Example 8

[0105] like Figure 14 As shown, the only difference between this embodiment and the above embodiment seven is that the end of the spacer 4 is sleeved on the outer wall of the movable seat 7 and fixedly connected to the movable seat 7, and the structure of the spacer 4 extending towards the valve port 301 is a straight-through structure.

[0106] Example 9

[0107] like Figure 15As shown, the only difference between this embodiment and the first embodiment described above is the installation position of the valve needle 10 and the opening position of the throttling orifice. In this example, the valve needle 10 is installed at the center of the fixed seat 8, and a through-hole 801 is opened at the end of the fixed seat 8. The center of the movable seat 7 is opened with a throttling orifice that matches the valve needle 10. When the movable seat 7 moves axially, it can cooperate with the valve needle 10 to adjust the flow rate through the throttling orifice. During the throttling process, the fluid pushes the movable seat 7, and the valve needle 10 remains fixed, which can also achieve the throttling effect. Furthermore, since the valve needle 10 is always in a fixed state, the problem of vibration caused by frequent movement of the valve needle 10 can be avoided, further improving structural stability and reducing noise.

[0108] Example 10

[0109] like Figure 16 As shown, the only difference between this embodiment and the above embodiment nine is that the spacer 4 has a stepped structure, and its diameter gradually decreases from the end away from the valve port to the end closer to the valve port.

[0110] Example 11

[0111] like Figure 17 As shown, the only difference between this embodiment and the above embodiment ten is that the connection method between the spacer 4 and the movable seat 7 is different. In this example, the end of the movable seat 7 has a convex ring 702 extending outward along the axial direction, and the spacer 4 is sleeved inside the convex ring 702 and fixedly connected to the movable seat 7.

[0112] Example 12

[0113] like Figure 18 As shown, the only difference between this embodiment and the above embodiment eleven is that the connection method between the spacer 4 and the movable seat 7 is different. In this example, the end of the spacer 4 is sleeved on the outer wall of the movable seat 7 and fixedly connected to the movable seat 7.

[0114] Example 13

[0115] like Figure 19 As shown, the only difference between this embodiment and the above embodiment twelve is that: the spacer 4 is fitted on the outer wall of the movable seat 7, and the structure of the spacer 4 extending towards the valve port 301 is a straight-through structure.

[0116] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A variable throttle valve having a noise reduction function, characterized by, include: The valve seat (3) has a through channel inside and a valve port (301) is formed at one end. The valve sleeve (9) is integrally formed with the valve seat (3), and has a through channel inside, which is connected to the internal channel of the valve seat (3). The valve sleeve (9) has a side wall hole (901) in the circumferential direction. The valve core (6) is axially movable and installed in the valve sleeve (9), and is configured to fit with or separate from the valve port (301) to realize the flow of fluid. The throttling assembly includes a movable seat (7) axially movable inside the valve core (6), a spring (5) installed between the movable seat (7) and the end wall of the valve core (6), a spacer (4) installed on the movable seat (7), the spring (5) being sleeved outside the spacer (4), and a fixed seat (8) installed at the end of the valve core (6).

2. The variable restriction valve with noise reduction function according to claim 1, characterized in that, The end of the spacer (4) passes through the end of the valve core (6) and extends toward the valve port (301), and the outer wall of the spacer (4) slides in fit with the end face of the valve core (6).

3. The variable restriction valve with noise reduction function according to claim 1, characterized in that, The spacer (4) has a balance hole (401) in the circumferential direction, and the balance hole (401) connects the inner cavity of the spacer (4) with the cavity where the spring (5) is located.

4. The variable restriction valve with noise reduction function according to claim 1, characterized in that, It also includes a valve tube (1), which is connected to the internal channel of the valve seat (3). A flow passage (11) is formed between the outer wall of the valve sleeve (9) and the inner wall of the valve tube (1). When the valve core (6) is in contact with the valve port (301), the valve core (6) can isolate the inner cavity of the valve seat (3) from the flow passage (11). When the valve core (6) is separated from the valve port (301), the side wall hole (901) can connect the inner cavity of the valve seat (3) with the flow passage (11).

5. The variable restriction valve with noise reduction function according to claim 1, characterized in that, The fixed seat (8) has a throttling hole in the center, and the movable seat (7) has a valve needle (10) that matches the throttling hole installed in the middle. The movable seat (7) has a flow channel (701) for connecting the throttling hole with the inner cavity of the spacer (4).

6. The variable restriction valve with noise reduction function according to claim 5, characterized in that, The structure of the flow guiding channel (701) includes, but is not limited to, the following: The flow channel (701) is a through hole that is opened in the thickness direction of the movable seat (7) and extends through it; The flow channel (701) is a through groove formed on the outer wall of the movable seat (7) and extending along its thickness direction.

7. The variable restriction valve with noise reduction function according to claim 1, characterized in that, The valve sleeve (9) has a constricted portion (902) bent toward the center at one end away from the valve port (301). The minimum inner diameter of the constricted portion (902) is smaller than the outer diameter of the valve core (6), which is configured to prevent the valve core (6) from detaching from the valve sleeve (9).

8. The variable restriction valve with noise reduction function according to claim 1, characterized in that, The spacer (4) has an end through hole (402) at one end near the valve port (301), and the end through hole (402) includes, but is not limited to, any of the following: The end through hole (402) is a single through hole opened at the end of the spacer (4); The end through hole (402) is a plurality of evenly distributed small holes opened at the end of the spacer (4); The end through hole (402) is a plurality of evenly distributed strip holes opened at the end of the spacer (4), and two adjacent strip holes are connected to each other near the center of the spacer (4).

9. The variable restriction valve with noise reduction function according to claim 1, characterized in that, The spacer (4) is a straight cylindrical structure; or The spacer (4) has a stepped structure, and its diameter gradually decreases from the end away from the valve port to the end closer to the valve port.

10. The variable restriction valve with noise reduction function according to claim 1, characterized in that, The connection structure between the spacer (4) and the movable seat (7) includes, but is not limited to, the following: The end of the spacer (4) abuts against and is connected to the end of the movable seat (7); The end of the movable seat (7) has a convex ring (702) extending outward along the axial direction, and the spacer (4) is sleeved inside or outside the convex ring (702) and fixedly connected to the movable seat (7). The end of the spacer (4) is fitted onto the outer wall of the movable seat (7) and is fixedly connected to the movable seat (7).

11. The variable restriction valve with noise reduction function according to claim 1, characterized in that, The throttling assembly also includes a fixed seat (8) installed at the end of the valve core (6). A valve needle (10) is installed at the center of the fixed seat (8). A through guide hole (801) is opened at the end of the fixed seat (8). A throttling hole matching the valve needle (10) is opened at the center of the movable seat (7). When the movable seat (7) moves axially, it can cooperate with the valve needle (10) to adjust the flow rate through the throttling hole.

12. The variable restriction valve with noise reduction function according to claim 4, characterized in that, It also includes filter screens (2), which are installed inside the valve tube (1) at both ends and facing each other, and the valve seat (3) and valve sleeve (9) are located between the two filter screens (2).

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