Throttle valve

Abstract

The utility model provides a throttle valve which comprises a valve body assembly, a valve rod assembly, a valve rod assembly and a valve rod assembly. The valve element is movably arranged in the valve cavity, the valve element is provided with a first end and a second end which are oppositely arranged, the first end is arranged close to the valve port, and the valve element can control the flow at the valve port; the adjusting part is arranged in the valve body assembly, the adjusting part is located on the side, away from the valve port, of the second end, the adjusting part is in limiting fit with the second end, and the adjusting part can abut against the second end to limit the maximum displacement of the valve element; the elastic piece is arranged between the adjusting piece and the valve element, and the elastic piece can apply elastic force for moving towards the valve port to the valve element. By the adoption of the structure, the problem that in the prior art, when the valve port is opened, the valve element is prone to excessive displacement, and stability is poor can be solved.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and more specifically, to a throttle valve. Background Technology

[0002] As industrial equipment places increasingly higher demands on fluid control systems, traditional throttle valves often struggle to meet the required valve core stability. During the opening process of a traditional throttle valve, the pressure difference between the two chambers on either side of the valve orifice causes the valve core to be impacted by the medium, often resulting in excessive displacement of the valve core. This leads to the risk of the valve core moving up and down, especially under high pressure differential conditions, where this instability is more pronounced, adversely affecting the stability of the valve core and the flow control effect. Utility Model Content

[0003] This invention provides a throttle valve to solve the problem in the prior art where the valve core is prone to excessive displacement when the valve port is opened, resulting in poor stability.

[0004] To address the aforementioned problems, this utility model provides a throttling valve, comprising: a valve body assembly having a valve cavity and a valve port, the valve cavity communicating with the valve port; a valve core movably disposed within the valve cavity, the valve core having a first end and a second end disposed opposite to each other, the first end being disposed near the valve port, the valve core being capable of controlling the flow rate at the valve port; an adjusting member disposed within the valve body assembly, the adjusting member being located on the side of the second end away from the valve port, the adjusting member being in a limiting cooperation with the second end, the adjusting member being able to abut against the second end to limit the maximum displacement of the valve core; and an elastic member disposed between the adjusting member and the valve core, the elastic member being capable of applying an elastic force to the valve core toward the valve port.

[0005] Furthermore, the first end has a throttling section that extends along the axial direction of the valve core. When the adjusting member abuts against the second end, part of the throttling section is located inside the valve port.

[0006] Furthermore, the first end includes a blocking section and a throttling section connected in sequence. The outer diameter of the throttling section is smaller than the outer diameter of the blocking section and the inner diameter of the valve port, respectively. The blocking section is used to block or open the valve port.

[0007] Furthermore, the valve core stroke is in the range of 0.1mm to 0.5mm.

[0008] Furthermore, there is an adjustment structure between the adjusting element and the valve body assembly, which can adjust the axial distance between the adjusting element and the valve core.

[0009] Furthermore, the valve body assembly includes: a valve tube; a valve seat disposed within the valve tube, the valve seat having a valve cavity, a valve port being provided at one end of the valve seat, an adjusting element being disposed at the other end of the valve seat, and a fluid passage being provided within the valve seat, the fluid passage extending through both ends of the valve seat so that fluid at the valve port can flow through the fluid passage to the other end of the valve seat.

[0010] Furthermore, the outer wall of the adjusting element is threadedly connected to the inner wall of the valve seat.

[0011] Furthermore, the outer wall of the valve core and / or the outer wall of the regulating element are provided with a cross section, and there is a gap between the cross section and the inner wall of the valve seat, the gap forming a fluid passage.

[0012] Furthermore, the end of the valve seat furthest from the valve port has a limiting part, which abuts against and limits the end of the adjusting member.

[0013] Furthermore, the second end of the valve core has a first receiving groove, the side of the adjusting member near the valve port is provided with a second receiving groove, one end of the elastic member is located in the first receiving groove, and the other end of the elastic member is located in the second receiving groove.

[0014] Furthermore, the regulating component includes a main body and multiple protrusions. The multiple protrusions are located at one end of the main body near the valve port and are arranged in a ring at intervals. The multiple protrusions surround to form a second receiving groove, and a flow groove is formed between two adjacent protrusions. The flow groove communicates with the second receiving groove. A flow hole is provided on the main body, which penetrates the main body and communicates with the second receiving groove.

[0015] By employing the technical solution of this utility model, an elastic element is provided between the adjusting element and the valve core. This elastic element consistently applies a spring force towards the valve core. When the pressure difference between the two chambers on either side of the valve core becomes significant, such that the pressure exerted by the medium on the valve core exceeds the spring force of the elastic element, the valve core begins to move away from the valve core, and the first end of the valve core opens the valve core. As the valve core moves further, because the adjusting element is positioned on the side of the valve core away from the valve core to limit its movement, when the second end of the valve core contacts the adjusting element, the displacement of the valve core reaches the set maximum value, and the valve core stops moving. By adopting the above structure, the movement stroke of the valve core can be limited, allowing the valve core to maintain its stability under high pressure differential conditions, preventing the valve core from moving up and down, thereby enabling precise control of the medium flow rate. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0017] Figure 1 A cross-sectional view of the throttle valve provided by this utility model is shown;

[0018] Figure 2 A cross-sectional view of the valve body assembly provided by this utility model in the valve port closed state is shown;

[0019] Figure 3A cross-sectional view of the valve body assembly provided by this utility model in the valve port open state is shown.

[0020] Figure 4 A schematic diagram of the structure of the adjusting component provided by this utility model is shown;

[0021] Figure 5 A schematic diagram of the valve core provided by this utility model is shown;

[0022] Figure 6 A schematic diagram of the valve seat provided by this utility model is shown;

[0023] Figure 7 A side view of the valve seat provided by this utility model is shown;

[0024] Figure 8 It shows Figure 7 AA cross-section view.

[0025] The above figures include the following reference numerals:

[0026] 10. Valve body assembly;

[0027] 11. Valve pipe;

[0028] 12. Valve seat; 121. Fluid passage;

[0029] 13. Valve port;

[0030] 20. Valve core; 201. Blocking section; 202. Throttling section; 203. Cross-section;

[0031] 21. First receiving tank;

[0032] 30. Adjusting component; 301. Protrusion; 302. Main body;

[0033] 31. Second receiving tank; 311. Flow tank;

[0034] 32. Flow hole;

[0035] 40. Elastic components;

[0036] 50. Filter components. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0038] like Figure 1 and Figure 3 As shown, this utility model embodiment provides a throttle valve, which includes a valve body assembly 10, a valve core 20, an adjusting member 30, and an elastic member 40. The valve body assembly 10 has a valve cavity and a valve port 13, which are connected. The valve core 20 is movably disposed in the valve cavity and has a first end and a second end disposed opposite to each other. The first end is disposed near the valve port 13 and the valve core 20 can control the flow rate at the valve port 13. The adjusting member 30 is disposed in the valve body assembly 10 and is located on the side of the second end away from the valve port 13. The adjusting member 30 is limited to the second end and can abut against the second end to limit the maximum displacement of the valve core 20. The elastic member 40 is disposed between the adjusting member 30 and the valve core 20 and can apply an elastic force to the valve core 20 to move toward the valve port 13.

[0039] By applying the technical solution of this utility model, an elastic element 40 is provided between the adjusting element 30 and the valve core 20. The elastic element 40 always applies a spring force to the valve core 20 toward the valve port 13. When the pressure difference between the two cavities on both sides of the valve port 13 is large enough that the pressure generated by the medium on the valve core 20 exceeds the spring force of the elastic element 40, the valve core 20 begins to move away from the valve port 13, and the first end of the valve core 20 opens the valve port 13. As the valve core 20 moves further, since the adjusting element 30 is located on the side of the valve core 20 away from the valve port 13 to achieve the limiting effect of the adjusting element 30 on the valve core 20, when the second end of the valve core 20 contacts the adjusting element 30, the displacement of the valve core 20 reaches the set maximum value, and the valve core 20 stops moving. By adopting the above structure, the movement stroke of the valve core 20 can be limited, so that the valve core 20 can maintain its own movement stability under high pressure difference, avoiding the valve core 20 from moving up and down, thereby enabling precise control of the flow rate of the medium.

[0040] Specifically, the first end has a throttling section that extends along the axial direction of the valve core 20. When the adjusting member 30 abuts against the second end, part of the throttling section is located inside the valve port 13. In this embodiment, by always placing the throttling section inside the valve port 13, it can be ensured that when the valve core 20 moves away from the valve port 13, the flow rate of the medium is always limited by the throttling section, avoiding the problem of a large amount of medium directly entering the low-pressure environment from the high-pressure environment, which would cause the valve core 20 to move. At the same time, the valve port 13 can also limit the valve core 20, preventing the valve core 20 from shaking in the radial direction, thereby further improving the stability of the valve core 20.

[0041] like Figure 2 and Figure 3 As shown, the first end includes a blocking section 201 and a throttling section 202 connected in sequence. The outer diameter of the throttling section 202 is smaller than the outer diameter of the blocking section 201 and the inner diameter of the valve port 13, respectively. The blocking section 201 is used to block or open the valve port 13. In this embodiment, when the two sides of the valve port 13 are under a high pressure differential, causing the blocking section 201 to open the valve port 13, the medium forms a throttling effect through the gap between the throttling section 202 and the valve port 13, preventing a large amount of medium from directly entering the valve port 13 and causing the valve core 20 to move erratically, thus leading to uncontrolled medium flow. In addition, the outer diameter of the blocking section 201 is set to be larger than the outer diameter of the throttling section 202, so that the blocking section 201 can be in close contact with the valve port 13 under low pressure differential conditions, ensuring that the gap between the throttling section 202 and the valve port 13 can be completely blocked by the blocking section 201, thereby achieving a seal on the valve cavity.

[0042] Specifically, the throttling section 202 can be a cylindrical structure with an outer diameter smaller than the outer diameter of the sealing section 201 and the inner diameter of the valve port 13, to ensure that the gap between the throttling section 202 and the valve port 13 can form a precise throttling area when the valve is opened. The sealing section 201 can be a conical structure, which allows for better contact with the valve port 13 through the conical surface of the cone, further enhancing the sealing effect.

[0043] Specifically, the blocking section 201 and the throttling section 202 are integrally molded, which enhances the structural strength of the valve core 20 and facilitates processing.

[0044] Preferably, the stroke of the valve core 20 is within the range of 0.1 mm to 0.5 mm. Specifically, the stroke of the valve core 20 refers to the distance between the end of the adjusting member 30 closest to the valve core 20 and the second end of the valve core 20 when the valve core 20 blocks the valve port 13. It can be 0.1, 0.2, 0.25, 0.3 or 0.5 mm. Since the adjusting member 30 limits the movement stroke of the valve core 20 to a small range, it can reduce the displacement of the valve core 20 and improve its stability. It also allows the gap between the throttling section 202 of the valve core 20 and the valve port 13 to form a more precise throttling area, reducing the medium fluctuation caused by the high pressure difference. While achieving throttling, it further improves the stability of the valve core 20.

[0045] Furthermore, an adjustment structure is provided between the adjusting member 30 and the valve body assembly 10, which can adjust the axial distance between the adjusting member 30 and the valve core 20. In this embodiment, the axial distance between the adjusting member 30 and the second end of the valve core 20 can be flexibly adjusted through the adjustment structure, thereby changing the preload of the elastic element and realizing flexible control of the opening pressure difference of the valve port 13. Moreover, the above adjustment can also be adjusted to the stroke size and throttling efficiency of the throttling section 202, improving the overall flexibility and reliability of the throttling valve.

[0046] Preferably, the outer wall of the adjusting member 30 is threadedly connected to the inner wall of the valve seat 12. This connection method not only makes the adjusting member 30 more flexible but also ensures its stability, thereby achieving precise and stable control of the opening pressure differential and displacement of the valve core 20. Of course, in other embodiments of this application, the axial movement and fixation of the adjusting member 30 within the valve seat 12 can also be achieved through a sliding groove and a snap-fit ​​structure.

[0047] Specifically, the end of the valve seat 12 furthest from the valve port 13 has a limiting portion, which abuts against and limits the end of the adjusting member 30. In this embodiment, after the adjusting member 30 is threadedly connected to the valve seat 12, the limiting portion at one end of the valve seat 12 limits the adjusting member 30, further enhancing the stability of the adjusting member 30's position inside the valve seat 12 and avoiding the risk of displacement or dislodgement of the adjusting member 30 during use. The limiting portion is formed by inward compression deformation of the end of the valve seat 12 furthest from the valve port 13.

[0048] like Figure 1 and Figure 6 As shown, the valve body assembly 10 includes a valve tube 11 and a valve seat 12. The valve seat 12 is disposed inside the valve tube 11 and has a valve cavity. One end of the valve seat 12 is provided with a valve port 13. An adjusting member 30 is disposed at the other end of the valve seat 12. A fluid channel 121 is provided inside the valve seat 12 and extends through both ends of the valve seat 12 so that the fluid at the valve port 13 can flow through the fluid channel 121 to the other end of the valve seat 12.

[0049] In this embodiment, the valve seat 12 includes a valve cavity and a valve port 13. The fluid channel 121 inside the valve seat 12 extends through both ends of the valve seat 12, ensuring that the medium can enter the valve cavity from the valve port 13 and flow smoothly through the fluid channel 121 to the other end of the valve seat 12.

[0050] like Figure 5 , Figure 7 and Figure 8As shown, the outer wall of the valve core 20 and / or the outer wall of the adjusting member 30 are provided with a cross-section 203. The cross-section 203 is spaced from the inner wall of the valve seat 12, forming a fluid channel 121. In this embodiment, the valve core 20 opens under the action of a high pressure differential. The medium entering from the valve port 13 flows away from the valve port along the fluid channel 121. The cross-section 203 on the adjusting member 30 also forms a fluid channel 121 with the space between it and the inner wall of the valve seat 12, allowing the medium to flow smoothly through the adjusting member 30 and out of the valve seat 12.

[0051] Specifically, the cut surface 203 is usually distributed in a ring shape, and its extension direction is parallel to the axis of the valve core 20. This ensures that a stable gap is formed between the cut surface 203 and the inner wall of the valve seat 12 during the movement of the valve core 20, so that the valve core 20 can be evenly stressed around its perimeter. This enhances the stability of the valve core 20 and allows the medium to flow evenly within the fluid channel 121.

[0052] Specifically, the valve seat 12 is provided with an installation groove, and the valve tube 11 can be fixed to the installation groove by necking fit or other connection methods, so that the valve seat 12 can be stably assembled in the valve tube 11, ensuring the stability and sealing of the valve seat 12.

[0053] Specifically, such as Figure 4 As shown, the regulating member 30 has a flow hole 32 at one end away from the valve port 13 along the axial direction. When the valve port 13 is open, the medium entering the valve cavity from the valve port 13 can enter the next cavity through the fluid channel 121 formed by the regulating member 30 and the valve seat 12, or it can enter the next cavity through the flow hole 32 of the regulating member 30. By setting the flow hole 32 and the cross-section, the flow area of ​​the medium is increased, so that the medium can quickly enter the next cavity and reduce the resistance of the regulating member 30 to the medium.

[0054] Furthermore, the second end of the valve core 20 has a first receiving groove 21, and the side of the adjusting member 30 near the valve port 13 is provided with a second receiving groove 31. One end of the elastic member 40 is located in the first receiving groove 21, and the other end of the elastic member 40 is located in the second receiving groove 31. In this embodiment, the second receiving groove 31 is used for the installation, fixation, and correct positioning of the elastic member 40, and the other end of the elastic member 40 is placed in the first receiving groove 21, so that the adjusting member 30, the elastic member 40, and the valve core 20 form a stable elastic structure.

[0055] Furthermore, the regulating member 30 includes a main body 302 and a plurality of protrusions 301. The plurality of protrusions 301 are located at one end of the main body 302 near the valve port 13, and are arranged annularly at intervals, forming a second receiving groove 31. A flow groove 311 is formed between two adjacent protrusions 301, and the flow groove 311 communicates with the second receiving groove 31. A flow hole 32 is provided on the main body 302, which penetrates the main body 302 and communicates with the second receiving groove 31. In this embodiment, when the two sides of the valve port 13 are under a high pressure difference, the plurality of protrusions 301 can stably abut against the second end of the valve core 20 by limiting the main body 302 of the regulating member 30 through the limiting part. The flow groove 311 formed between two adjacent protrusions 301 allows the medium in the fluid channel 121 to directly communicate with the second receiving groove 31 through the flow groove 311, further reducing the flow resistance of the medium and improving the flow effect. The second receiving groove 31 is located between two adjacent protrusions 301, which can both accommodate the elastic element 40 and cooperate with the flow hole 32 to allow the medium to flow into or out of the valve cavity.

[0056] Specifically, the dimensions of the first receiving groove 21 and the second receiving groove 31 are respectively matched with the elastic member 40, and the first receiving groove 21 and the second receiving groove 31 are aligned in the axial direction to ensure that the elastic member 40 can be securely embedded therein, so as to facilitate the compression and release action of the elastic member 40.

[0057] Preferably, the elastic element 40 can be a spring. The spring should be selected to meet the following conditions: it should provide sufficient elastic force to keep the valve core 20 closed under low pressure differential, while under high pressure differential, it should be compressed to a certain extent to allow the valve core 20 to open and achieve valve body throttling. In addition, the spring is initially in a pre-compressed state, which can provide a certain elastic force to the valve core 20 to ensure that the sealing section 201 can make tight contact with the valve port 13 to achieve a seal.

[0058] like Figure 1 As shown, the throttle valve also includes a filter element 50, which is disposed inside the valve tube 11 and located on the side of the valve seat 12 near the valve port 13. With this arrangement, before the medium enters the valve port 13, impurities are filtered through the filter element 50, preventing impurities from entering the valve cavity. This protects the valve core 20 and other internal components from contamination, extending the service life and reliability of the throttle valve.

[0059] Specifically, the filter element 50 includes a clamp and a filter screen. The clamp is fixedly installed around the inner wall of the valve pipe 11, and the filter screen is fixed by the tight squeezing action of the clamp, preventing the filter screen from falling off or tilting due to excessive pressure of the medium.

[0060] Before using the throttle valve, the distance between the adjusting element 30 and the valve core 20 should be adjusted according to the required opening pressure difference, thereby changing the spring preload. Specifically, when the adjusting element 30 is adjusted towards the valve port 13, the spring is compressed, and the opening pressure difference of the valve core 20 increases accordingly. Conversely, when the adjusting element 30 is adjusted away from the valve port 13, the spring preload decreases, and the valve core 20 opens more easily. During use, when the pressure exerted by the medium on the valve core 20 is less than the elastic force of the elastic element 40, the sealing section 201 will seal the valve port 13. When the pressure exerted by the medium on the valve core 20 exceeds the elastic force of the elastic element 40, the valve core 20 begins to move away from the valve port 13, and stops moving when the valve core 20 contacts the adjusting element 30. The regulating element 30 limits the travel of the valve core 20, enabling the valve core 20 to maintain its own movement stability under high pressure differential. Since the limited distance value is within a small range, the throttling section 202 of the valve core 20 can always be inside the valve port 13, which further improves the stability of the valve core 20 while realizing the throttling effect on the medium.

[0061] The technical solution of this application can achieve the following beneficial effects:

[0062] 1. By setting an adjusting element 30 inside the valve seat 12 and setting a small distance range between the adjusting element 30 and the end of the valve core 20 away from the valve port 13, the adjusting element 30 limits the valve core 20 while the throttling section is always inside the valve port 13. This avoids the valve core 20 from moving up and down due to excessive pressure difference changes, enhances the stability of the valve core 20, and makes the medium flow stable and controllable. At the same time, through the elastic force of the spring on the valve core 20, the sealing section 201 can be tightly fitted to the valve port 13 in the low pressure state, and the valve core 20 can move stably and throttle precisely in the high pressure difference state.

[0063] 2. By setting the position of the adjusting element 30 to be adjustable relative to the valve seat 12, the axial distance between the valve core 20 and the adjusting element 30 can be changed according to actual needs, thereby achieving precise adjustment of the valve opening pressure difference, improving the flexibility and adaptability of the throttle valve, and reducing adjustment costs and time consumption.

[0064] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0065] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0066] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0067] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0068] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0069] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A throttle valve, characterized in that, The throttle valve includes: A valve body assembly (10) having a valve cavity and a valve port (13) in communication with the valve port (13); A valve core (20) is movably disposed in the valve cavity. The valve core (20) has a first end and a second end disposed opposite to each other. The first end is disposed close to the valve port (13). The valve core (20) is capable of controlling the flow rate at the valve port (13). An adjusting member (30) is disposed within the valve body assembly (10). The adjusting member (30) is located on the side of the second end away from the valve port (13). The adjusting member (30) is in a limiting cooperation with the second end. The adjusting member (30) can abut against the second end to limit the maximum displacement of the valve core (20). An elastic element (40) is disposed between the adjusting element (30) and the valve core (20), and the elastic element (40) is capable of applying an elastic force to the valve core (20) to move toward the valve port (13).

2. The throttle valve according to claim 1, characterized in that, The first end has a throttling section that extends along the axial direction of the valve core (20). When the adjusting member (30) abuts against the second end, a portion of the throttling section is located inside the valve port (13).

3. The throttle valve according to claim 2, characterized in that, The first end includes a blocking section (201) and a throttling section (202) connected in sequence. The outer diameter of the throttling section (202) is smaller than the outer diameter of the blocking section (201) and the inner diameter of the valve port (13). The blocking section (201) is used to block or open the valve port (13).

4. The throttle valve according to claim 1, characterized in that, The stroke of the valve core (20) is in the range of 0.1 mm to 0.5 mm.

5. The throttle valve according to claim 1, characterized in that, The adjusting member (30) has an adjusting structure with respect to the valve body assembly (10), the adjusting structure being able to adjust the axial distance of the adjusting member (30) relative to the valve core (20).

6. The throttle valve according to claim 1, characterized in that, The valve body assembly (10) includes: Valve tube (11); A valve seat (12) is disposed inside the valve tube (11). The valve seat (12) has the valve cavity. One end of the valve seat (12) is provided with the valve port (13). The adjusting member (30) is disposed at the other end of the valve seat (12). A fluid channel (121) is provided inside the valve seat (12). The fluid channel (121) passes through both ends of the valve seat (12) so that the fluid at the valve port (13) can flow through the fluid channel (121) to the other end of the valve seat (12).

7. The throttle valve according to claim 6, characterized in that, The outer wall of the adjusting member (30) is threadedly connected to the inner wall of the valve seat (12).

8. The throttle valve according to claim 6, characterized in that, The outer wall of the valve core (20) and / or the outer wall of the adjusting member (30) are provided with a cross section (203), and the cross section (203) is spaced from the inner wall of the valve seat (12), the space forming the fluid passage (121).

9. The throttle valve according to claim 6, characterized in that, The valve seat (12) has a limiting portion at one end away from the valve port (13), and the limiting portion abuts against the end of the adjusting member (30) away from the valve port (13) to limit the position of the adjusting member (30) within the valve seat (12).

10. The throttle valve according to claim 1, characterized in that, The valve core (20) has a first receiving groove (21) at its second end, and the adjusting member (30) has a second receiving groove (31) on the side near the valve port (13). One end of the elastic member (40) is located in the first receiving groove (21), and the other end of the elastic member (40) is located in the second receiving groove (31).

11. The throttle valve according to claim 10, characterized in that, The adjusting member (30) includes a main body (302) and a plurality of protrusions (301). The plurality of protrusions (301) are located at one end of the main body (302) near the valve port (13) and are arranged in a ring at intervals. The plurality of protrusions (301) surround to form the second receiving groove (31). A flow groove (311) is formed between two adjacent protrusions (301). The flow groove (311) communicates with the second receiving groove (31). A flow hole (32) is provided on the main body (302). The flow hole (32) penetrates the main body (302) and communicates with the second receiving groove (31).

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