Valve needle assembly and three-way valve with same

Abstract

The utility model provides a valve needle assembly and a three-way valve with the valve needle assembly, and the valve needle assembly comprises a first valve needle which is used for connecting a driving device; the second valve needle comprises a connecting sleeve and a valve needle body which are connected with each other, the valve needle body is connected with the first valve needle through the connecting sleeve, the valve needle body is provided with a first end and a second end which are oppositely arranged, the first end is provided with a plugging piece, the second end is used for being connected with the connecting sleeve, and the outer diameter of the maximum outer diameter position of the first end is equal to the outer diameter of the maximum outer diameter position of the second end; and the outer diameter of the maximum outer diameter part of the first end and the outer diameter of the maximum outer diameter part of the second end are the maximum outer diameter of the valve needle body. By means of the technical scheme, the problem that in the prior art, a valve needle assembly is not prone to being clamped during machining can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of control valves, in particular to a valve needle assembly and a three-way valve having the same. Background Art

[0002] At present, the control valve used to regulate fluid flow is usually composed of a drive component, a valve body and a valve needle. The valve body has a valve port, and the drive component is connected to the valve needle to drive the valve needle to move relative to the valve port. A sealing component is provided on the valve needle. The valve needle moves relative to the valve port to achieve the function of regulating the flow at the valve port.

[0003] In the prior art, in order to ensure the sealing performance of the valve needle and the valve port, the valve needle is usually set as a split structure, and an elastic component is set on the valve needle to provide a pre-tightening force for the sealing part to seal the valve port. At present, relatively complex mounting structures and connecting structures are usually set at both ends of the valve needle provided with the sealing part. The connecting structure is used to connect the split valve needle, and the mounting structure is used to install the sealing part. The connecting structure and the mounting structure are usually directly turned by the valve needle. Before processing, one end for installing the sealing part needs to be clamped by a fixture, and then the other end is processed. However, this will cause the valve needle to extend too long from the fixture. During the processing, the valve needle is prone to shaking, which affects the stability of the fixture clamping and is not conducive to the processing and forming of the valve needle. Utility Model Content

[0004] The utility model provides a valve needle assembly to solve the problem in the prior art that the valve needle assembly is difficult to clamp during processing.

[0005] According to one aspect of the present invention, a valve needle assembly is provided, which includes: a first valve needle, which is used to connect to a driving device; a second valve needle, which includes a connecting sleeve and a valve needle body that are connected to each other, and the valve needle body is connected to the first valve needle through the connecting sleeve, and the valve needle body has a first end and a second end that are relatively arranged, and a sealing member is provided on the first end, and the second end is used to be connected to the connecting sleeve, the outer diameter at the maximum outer diameter of the first end is equal to the outer diameter at the maximum outer diameter of the second end, and the outer diameter at the maximum outer diameter of the first end and the outer diameter at the maximum outer diameter of the second end are the maximum outer diameters of the valve needle body.

[0006] Furthermore, along the direction from the second end to the first end, the valve needle body has a connecting section, a body section and an installation section arranged in sequence, the connecting section is used to connect with the connecting sleeve, the installation section is used to install the sealing piece, and the outer diameter of the body section is smaller than the outer diameters of the connecting section and the installation section.

[0007] Furthermore, the installation section has a stop boss and an installation boss sequentially arranged along the direction from the second end to the first end, the outer diameter of the installation boss is smaller than the maximum outer diameter of the stop boss, and the blocking piece is sleeved on the installation boss.

[0008] Furthermore, the connecting section is plug-fitted to the connecting sleeve, and the outer wall of the connecting section has an annular stop protrusion, which is used to limit the relative displacement of the connecting sleeve and the second valve needle in the axial direction.

[0009] Furthermore, a flow guiding structure is provided on the stop boss, and the flow guiding structure includes an inclined surface, a curved surface or a conical surface to guide the fluid passing through the second valve needle.

[0010] Furthermore, the stop boss has a conical section and a straight section arranged in sequence, the straight section is located on the side of the conical section close to the mounting boss, the outer diameter of the conical section gradually increases from the second end to the first end, and the conical section forms a guide structure.

[0011] Furthermore, the cone angle of the cone section is α, 130°<α<160°.

[0012] Furthermore, along the extension direction of the second valve needle, the length of the straight section is L1, the length of the tapered section is L2, and L2>2*L1.

[0013] According to another aspect of the present invention, a three-way valve is provided, which includes: a valve body assembly, having a circulation cavity, a first circulation port, a second circulation port and a third circulation port arranged in sequence on the side wall of the circulation cavity, a first valve port being arranged between the first circulation port and the second circulation port, the first circulation port and the second circulation port being connected through the first valve port, a second valve port being arranged between the second circulation port and the third circulation port, the second circulation port and the third circulation port being connected through the second valve port; a valve needle assembly, the valve needle assembly is the valve needle assembly described above in the claim, the valve needle assembly is movably arranged in the circulation cavity, and the sealing member on the valve needle assembly is movably arranged between the first valve port and the second valve port to seal the first valve port or the second valve port.

[0014] Furthermore, the outer diameter of the blocking member is larger than the maximum diameter of the second valve needle. The blocking member has a first end face and a second end face which are arranged opposite to each other along the axial direction of the second valve needle. The first end face is used to seal with the first valve port, and the second end face is used to seal with the second valve port.

[0015] By applying the technical solution provided in the present application, by setting the outer diameter at the maximum outer diameter of the first end to be equal to the outer diameter at the maximum outer diameter of the second end, during the process of processing the second valve needle, the clamp can simultaneously clamp the first end and the second end of the second valve needle from one direction, and then process various parts of the second valve needle in the other direction to ensure the stability of the clamp in clamping the second valve needle, and ensure the processing accuracy and processing quality of various parts of the second valve needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 Shows a schematic structural diagram of the valve needle assembly provided by the utility model;

[0018] Figure 2 It shows a schematic structural diagram of the valve needle body provided by the utility model;

[0019] Figure 3 The figure shows a schematic structural diagram of the three-way valve provided by the present invention when the first valve port is blocked;

[0020] Figure 4 The figure shows the structure of the three-way valve provided by the present invention when the second valve port is blocked;

[0021] Figure 5 Shown Figure 3 A partial enlarged view of point A in the middle;

[0022] Figure 6 Shown Figure 4 A partial enlarged view of point B in the middle.

[0023] The above drawings include the following reference numerals:

[0024] 100. Valve body assembly;

[0025] 110, circulation cavity; 111, first circulation port; 112, second circulation port; 113, third circulation port;

[0026] 101, first valve port; 102, second valve port;

[0027] 200, valve needle assembly;

[0028] 201, first elastic member; 202, second elastic member;

[0029] 210, first valve needle; 211, limiting portion;

[0030] 220, second valve needle;

[0031] 221, connecting sleeve;

[0032] 222, valve needle body; 2221, connecting section; 22211, stop boss; 2222, body section; 2223, mounting section; 22231, stop boss; 22232, mounting boss;

[0033] 231, first limiting surface; 232, second limiting surface; 233, abutting boss;

[0034] 400. Sealing parts. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a valve needle assembly, which includes a first valve needle 210 and a second valve needle 220. The first valve needle 210 is used to connect to a drive device, and the second valve needle 220 includes a connecting sleeve 221 and a valve needle body 222 that are connected to each other. The valve needle body 222 is connected to the first valve needle 210 via the connecting sleeve 221. The valve needle body 222 has a first end and a second end that are oppositely disposed. A blocking member 400 is provided on the first end, and the second end is used to connect to the connecting sleeve 221. The outer diameter at the maximum outer diameter of the first end is equal to the outer diameter at the maximum outer diameter of the second end, and the outer diameters at the maximum outer diameter of the first end and the maximum outer diameter of the second end are the maximum outer diameters of the valve needle body 222.

[0037] Specifically, the valve needle assembly further includes an elastic assembly, which is disposed in the connecting sleeve 221 and is used to provide the second valve needle 220 with an elastic force toward the valve port.

[0038] By applying the technical solution provided in this application, when the first valve needle 210 is connected to the drive device, the elastic component between the first valve needle 210 and the second valve needle 220 can provide a preload force for the sealing member 400 to seal the valve port, thereby ensuring the sealing performance of the sealing member 400 in sealing the valve port and the overall performance of the valve needle assembly. Furthermore, by setting the outer diameter at the maximum outer diameter of the first end equal to the outer diameter at the maximum outer diameter of the second end, during the machining of the valve needle body 222, the fixture can simultaneously clamp the first and second ends of the valve needle body 222 from one direction, and then machine various parts of the valve needle body 222 from another direction, thereby ensuring the stability of the fixture's grip on the valve needle body 222 and the machining accuracy and quality of various parts of the second valve needle 220.

[0039] Specific as Figure 2As shown, along the direction from the second end to the first end, the valve needle body 222 includes a connecting section 2221, a body section 2222, and a mounting section 2223, which are sequentially arranged. The connecting section 2221 is used to connect to the connecting sleeve 221, and the mounting section 2223 is used to mount the blocking member 400. The outer diameter of the body section 2222 is smaller than the outer diameters of the connecting section 2221 and the mounting section 2223. This arrangement can reduce the space occupied by the valve needle body 222, thereby reducing the impact of the second valve needle 220 on fluid circulation, and ensuring the fluid flow capacity within the circulation chamber 110.

[0040] Furthermore, the mounting section 2223 includes a stop boss 22231 and a mounting boss 22232, arranged sequentially from the second end to the first end. The outer diameter of the mounting boss 22232 is smaller than the maximum outer diameter of the stop boss 22231, and the blocking member 400 is mounted on the mounting boss 22232. This arrangement allows the blocking member 400 to be mounted on the mounting boss 22232, with the stop boss 22231 limiting its displacement toward the second end, ensuring stable installation of the blocking member 400.

[0041] Specifically, one end of the mounting boss 22232 away from the stop boss 22231 may be fixedly provided with a mounting block or a mounting plate or other fixing structure to limit the displacement of the blocking member 400 in a direction away from the second end.

[0042] Optionally, the fixing structure can be fixed on the mounting boss 22232 by welding or riveting, as long as the connection strength can be guaranteed.

[0043] Furthermore, the connecting sleeve 221 and the valve needle body 222 may be connected by threaded connection or welding connection to ensure the connection strength between the connecting sleeve 221 and the valve needle body 222 .

[0044] Specifically, a flow-guiding structure is provided on the stop boss 22231. In a feasible embodiment of the present application, the flow-guiding structure includes an inclined surface, a curved surface, or a conical surface to guide the fluid passing through the second valve needle 220. With this arrangement, the fluid can be guided by the flow-guiding structure as it flows through the stop boss 22231, thereby reducing turbulence in the flow chamber 110 and ensuring effective flow of the fluid within the flow chamber 110.

[0045] Specifically, the stop boss 22231 comprises a tapered section and a straight section arranged in sequence. The straight section is located on the side of the tapered section closest to the mounting boss 22232. The outer diameter of the tapered section gradually decreases from the second end to the first end, forming a flow-guiding structure. This arrangement guides the flow of fluid, preventing turbulence after the fluid passes through a large bend, thereby ensuring the fluid's flow capacity after passing through the stop boss 22231. The straight section ensures the smoothness of the tapered section's edges, preventing damage to the sealing member 400. Furthermore, the straight section can be used to adjust the mating area between the stop boss 22231 and the sealing member 400.

[0046] In a specific embodiment of the present application, the cone angle of the conical section is α, and 130°≤α≤160°. When α<30° or α>160°, the valve needle body 222 still has a large turning point at the conical section, and the conical section has a poor fluid diversion effect. In the present application, by setting 130°≤α≤160°, it is possible to prevent the cone angle α from being too large or too small, thereby ensuring the conical section's fluid diversion effect. Specifically, the cone angle α can be set to 130°, 140°, 150°, or 160°.

[0047] Specifically, in the present application, along the extension direction of the second valve needle 220, the length of the straight segment is L1, and the length of the tapered segment is L2, where L2>2*L1. Through the above arrangement, once the length of the stop boss 22231 along the extension direction of the second valve needle 220 is determined, setting L2>2*L1 ensures that the taper angle α of the tapered segment remains within a certain range, thereby ensuring that the taper angle α is neither too large nor too small, further ensuring the diversion effect of the diversion structure.

[0048] In the present application, the outer wall of the connecting section 2221 is provided with an annular stop protrusion 22211, which is used to limit the relative axial displacement between the connecting sleeve 221 and the second valve needle 220. Through this arrangement, the stop protrusion 22211 can provide a positioning reference for the connecting sleeve 221 and the valve needle body 222. When the valve needle body 222 and the connecting sleeve 221 are plugged into each other, the stop protrusion 22211 can limit the relative displacement between the valve needle body 222 and the connecting sleeve 221, facilitating the proper installation of the valve needle body 222 and the connecting sleeve 221, thereby ensuring the overall installation and use of the second valve needle 220.

[0049] According to an embodiment of the present application, a three-way valve is also provided, such as Figures 3 and 4As shown, the three-way valve includes a valve body assembly 100 and a valve needle assembly 200. The valve body assembly 100 has a circulation cavity 110, and the side wall of the circulation cavity 110 has a first circulation port 111, a second circulation port 112, and a third circulation port 113 arranged in sequence. A first valve port 101 is arranged between the first circulation port 111 and the second circulation port 112, and the first circulation port 111 and the second circulation port 112 are connected through the first valve port 101. A second valve port 102 is arranged between the second circulation port 112 and the third circulation port 113, and the second circulation port 112 and the third circulation port 113 are connected through the second valve port 102. The valve needle assembly is the valve needle assembly described above. The valve needle assembly 200 is movably arranged in the circulation cavity 110. The blocking member 400 on the valve needle assembly 200 is movably arranged between the first valve port 101 and the second valve port 102 to block the first valve port 101 or the second valve port 102.

[0050] Specific reference Figure 1 As shown, the first valve needle 210 has a limiting portion 211 at one end close to the second valve needle 220 . The limiting portion 211 is used to cooperate with the connecting sleeve 221 to achieve the connection between the connecting sleeve 221 and the valve needle body 222 .

[0051] Optionally, the limiting portion 211 may be an annular protrusion protruding from the side wall of the first valve needle 210 , or a plurality of protrusions annularly spaced along the axial direction of the first valve needle 210 .

[0052] In the three-way valve provided in the present application, the elastic component includes a first elastic member 201 and a second elastic member 202. When the blocking member 400 blocks the first valve port 101, the combined force provided by the first elastic member 201 and the second elastic member 202 to the second valve needle 220 is a first elastic force toward the first valve port 101, so as to provide a pre-tightening force for the blocking member 400 to block the first valve port 101. When the blocking member 400 blocks the second valve port 102, the combined force provided by the first elastic member 201 and the second elastic member 202 to the second valve needle 220 is a first elastic force toward the first valve port 101. It is a second elastic force in the direction of the second valve port 102, so as to provide a pre-tightening force for the blocking member 400 to block the second valve port 102, and the first elastic force is equal to the second elastic force, so that the pre-tightening force when the blocking member 400 blocks the first valve port 101 can be equal to the pre-tightening force when blocking the second valve port 102. While ensuring the sealing effect of the blocking member 400, it can ensure that the valve opening capabilities of the solenoid valve at the first valve port 101 and the second valve port 102 are consistent, which is convenient for regulating the valve opening performance, so as to improve the valve opening capability of the three-way valve.

[0053] Specifically, the end of the connecting sleeve 221 away from the valve needle body 222 has an abutment boss 233, and the inner wall of the connecting sleeve 221 is provided with a first limiting surface 231 and a second limiting surface 232 arranged along the axial direction. The limiting portion 211 is movably arranged between the first limiting surface 231 and the second limiting surface 232. The first elastic member 201 is arranged on the side of the limiting portion 211 close to the first limiting surface 231, and the two ends of the first elastic member 201 respectively abut against the abutment boss 233 and the limiting portion 211. The second elastic member 202 is arranged on the side of the limiting portion 211 close to the second limiting surface 232, and the two ends of the second elastic member 202 respectively abut against the abutment boss 233 and the valve needle body 222.

[0054] like Figure 3 and Figure 5 As shown, when the blocking member 400 needs to move toward the second valve port 102, the first valve needle 210 first moves toward the second limit surface 232 and can push the second valve needle 220 toward the second valve port 102 through the second elastic member 202. After the blocking member 400 abuts against and blocks the second valve port 102, the limit portion 211 can continue to move toward the second limit surface 232 until the limit portion 211 abuts against the second limit surface 232. At this time, the second elastic member 202 is compressed by the force of the first valve needle 210, providing the second valve needle 220 with a pre-tightening force to block the second valve port 102; Figure 4 and Figure 6 As shown, when the blocking member 400 needs to move toward the first valve port 101, the first valve needle 210 first moves toward the side of the first limiting surface 231, and drives the second valve needle 220 to move toward the first valve port 101 through the first elastic member 201 and the abutting boss 233. After the blocking member 400 abuts and blocks the first valve port 101, the limiting portion 211 can continue to move toward the first limiting surface 231 until the limiting portion 211 contacts the first limiting surface 231. At this time, the first elastic member 201 will be compressed by the force of the first valve needle 210, providing the second valve needle 220 with a pre-tightening force to block the second valve port 102, so as to ensure the sealing effect of the three-way valve and reduce the possibility of internal leakage of the three-way valve.

[0055] Specifically in this embodiment, the inner wall of the connecting sleeve 221 forms a first limiting surface 231, and the end surface of the valve needle body 222 away from the sealing member 400 forms a second limiting surface 232. During installation, the first valve needle 210 can be inserted into the connecting sleeve 221 first, and then the valve needle body 222 and the connecting sleeve 221 are connected.

[0056] In the present application, the blocking member 400 can be set as a soft sealing gasket. When the blocking member 400 blocks the first valve port 101 or the second valve port 102, the blocking member 400 can produce a certain elastic deformation under the pre-tightening force, filling the gaps that may be caused by processing accuracy problems or installation stability, further ensuring the sealing effect of the three-way valve on the first valve port 101 and the second valve port 102, and reducing the internal leakage of the three-way valve.

[0057] Furthermore, the outer diameter of the blocking member 400 is greater than the maximum diameter of the second valve needle 220 of the valve needle assembly. The blocking member 400 has a first end face and a second end face disposed opposite each other along the axial direction of the second valve needle 220. The first end face is configured to seal with the first valve port 101, and the second end face is configured to seal with the second valve port 102. This arrangement enables the blocking member 400 to seal with both the first and second valve ports 101, 102 via its end faces, thereby increasing the sealing area of ​​the blocking member 400, ensuring the sealing effect of the blocking member 400, and reducing internal leakage in the three-way valve.

[0058] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0059] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0060] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0061] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0062] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A valve needle assembly, characterized in that: The valve needle assembly comprises: a first valve needle (210), the first valve needle (210) being used to connect to a driving device; The second valve needle (220) includes a connecting sleeve (221) and a valve needle body (222) connected to each other, the valve needle body (222) is connected to the first valve needle (210) through the connecting sleeve (221), the valve needle body (222) has a first end and a second end arranged opposite to each other, the first end is provided with a sealing member (400), the second end is used to connect with the connecting sleeve (221), the outer diameter at the maximum outer diameter of the first end is equal to the outer diameter at the maximum outer diameter of the second end, and the outer diameter at the maximum outer diameter of the first end and the outer diameter at the maximum outer diameter of the second end are the maximum outer diameters of the valve needle body (222).

2. The valve needle assembly according to claim 1, characterized in that Along the direction from the second end to the first end, the valve needle body (222) has a connecting section (2221), a main section (2222) and an installation section (2223) arranged in sequence, the connecting section (2221) is used to connect with the connecting sleeve (221), and the installation section (2223) is used to install the sealing member (400), and the outer diameter of the main section (2222) is smaller than the outer diameters of the connecting section (2221) and the installation section (2223).

3. The valve needle assembly according to claim 2, characterized in that The mounting section (2223) comprises a stop boss (22231) and a mounting boss (22232) sequentially arranged in a direction from the second end to the first end, the outer diameter of the mounting boss (22232) being smaller than the maximum outer diameter of the stop boss (22231), and the blocking member (400) being sleeved on the mounting boss (22232).

4. The valve needle assembly according to claim 2, characterized in that The connecting section (2221) is plug-fitted to the connecting sleeve (221), and the outer wall of the connecting section (2221) has a ring-shaped stop protrusion (22211), and the stop protrusion (22211) is used to limit the relative displacement of the connecting sleeve (221) and the second valve needle (220) in the axial direction.

5. The valve needle assembly according to claim 3, characterized in that A flow guiding structure is provided on the stop boss (22231), and the flow guiding structure comprises an inclined surface, a curved surface or a conical surface, so as to guide the fluid passing through the second valve needle (220).

6. The valve needle assembly according to claim 5, characterized in that The stop boss (22231) has a conical section and a straight section arranged in sequence, the straight section is located on the side of the conical section close to the mounting boss (22232), the outer diameter of the conical section gradually increases from the second end to the first end, and the conical section forms the guide structure.

7. The valve needle assembly according to claim 6, characterized in that The cone angle of the cone section is α, 130°<α<160°.

8. The valve needle assembly according to claim 6, characterized in that Along the extension direction of the second valve needle (220), the length of the straight segment is L1, the length of the tapered segment is L2, and L2>2*L1.

9. A three-way valve, characterized in that: The three-way valve comprises: A valve body assembly (100) comprises a circulation cavity (110), wherein a first circulation port (111), a second circulation port (112) and a third circulation port (113) are sequentially arranged on a side wall of the circulation cavity (110), a first valve port (101) is arranged between the first circulation port (111) and the second circulation port (112), and the first circulation port (111) and the second circulation port (112) are communicated through the first valve port (101), a second valve port (102) is arranged between the second circulation port (112) and the third circulation port (113), and the second circulation port (112) and the third circulation port (113) are communicated through the second valve port (102); A valve needle assembly (200), wherein the valve needle assembly (200) is the valve needle assembly (200) according to any one of claims 1 to 8, wherein the valve needle assembly (200) is movably arranged in the circulation chamber (110), and the sealing member (400) on the valve needle assembly (200) is movably arranged between the first valve port (101) and the second valve port (102) to seal the first valve port (101) or the second valve port (102).

10. The three-way valve according to claim 9, characterized in that: The outer diameter of the blocking member (400) is greater than the maximum diameter of the second valve needle (220), and the blocking member (400) has a first end face and a second end face that are arranged opposite to each other along the axial direction of the second valve needle (220), the first end face is used for sealing cooperation with the first valve port (101), and the second end face is used for sealing cooperation with the second valve port (102).

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