Three-way valve

Abstract

The utility model provides a three-way valve which comprises a valve body assembly, a first valve body, a second valve body and a third valve body, the valve body assembly is provided with a first circulation port, a second circulation port and a third circulation port, a first valve port is arranged between the first circulation port and the second circulation port, and a second valve port is arranged between the second circulation port and the third circulation port; a sealing piece arranged on the valve needle assembly is movably arranged between the first valve port and the second valve port; the valve needle assembly is provided with a first valve needle and a second valve needle which are sequentially connected, a sealing piece is arranged at the end, away from the first valve needle, of the second valve needle, a first elastic piece and a second elastic piece are arranged between the first valve needle and the second valve needle, and the first elastic piece and the second elastic piece jointly provide first elastic force and second elastic force for the second valve needle. The first elastic force is equal to the second elastic force. According to the technical scheme, the problem that in the prior art, the valve opening and closing capacities of the three-way valve at the two valve ports are inconsistent can be solved.

Description

Technical Field

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

[0002] At present, a two-position three-way valve is usually used to switch the fluid flow path. The two-position three-way valve in the prior art usually includes three flow chambers and two valve ports. The two valve ports are arranged at intervals between the three flow chambers, and the valve needle is movably arranged between the two valve ports to block or open the valve ports.

[0003] In the prior art, two springs are typically installed on the valve needle of a three-way valve. The two springs are used to provide elastic forces in two directions for the valve needle. When the valve needle blocks the valve port, the two springs can respectively provide preload forces on the valve needle toward the two valve ports, thereby ensuring that the valve needle effectively blocks the valve port and reducing internal leakage of the three-way valve. However, when the valve needle in the prior art moves between the two valve ports, the elastic forces applied by the two springs on the valve needle may be different. This will result in different preload forces applied by the two springs to the valve needle blocking the valve port. When electromagnetic pulses are applied to the three-way valve to open and close the valve, different electromagnetic pulses are required at the two valve ports, resulting in inconsistent valve opening and closing capabilities at the two valve ports, affecting the accuracy of three-way valve control. Utility Model Content

[0004] The utility model provides a three-way valve to solve the problem of inconsistent on-off valve capabilities at two valve ports of the three-way valve in the prior art.

[0005] The utility model provides a three-way valve, the three-way valve comprising: a valve body assembly with a flow cavity, the flow cavity having a first flow port, a second flow port and a third flow port arranged in sequence, a first valve port being arranged between the first flow port and the second flow port, the first flow port and the second flow port being communicated through the first valve port, a second valve port being arranged between the second flow port and the third flow port, the second flow port and the third flow port being communicated through the second valve port; a valve needle assembly being movably arranged in the flow cavity, a blocking piece being arranged on the valve needle assembly, the blocking piece being movably arranged between the first valve port and the second valve port, Blocking the first valve port or the second valve port; wherein the valve needle assembly has a first valve needle and a second valve needle connected in sequence, a blocking member is provided at an end of the second valve needle away from the first valve needle, a first elastic member and a second elastic member are provided between the first valve needle and the second valve needle, when the blocking member blocks the first valve port, the combined force provided by the first elastic member and the second elastic member to the second valve needle is a first elastic force toward the first valve port, and when the blocking member blocks the second valve port, the combined force provided by the first elastic member and the second elastic member to the second valve needle is a second elastic force toward the second valve port, and the first elastic force is equal to the second elastic force.

[0006] Furthermore, the elastic coefficients of the first elastic member and the second elastic member are equal.

[0007] Furthermore, the second valve needle has an accommodating cavity at one end away from the blocking member, and at least part of the first valve needle is inserted in the accommodating cavity. The first valve needle has a limiting portion at one end located in the accommodating cavity, and the limiting portion is used to limit the displacement of the first valve needle in the accommodating cavity. The first elastic member is arranged on a side of the limiting portion away from the blocking member, and the second elastic member is arranged on a side of the limiting portion close to the blocking member.

[0008] Furthermore, an end of the accommodating cavity away from the blocking member has an abutting boss, and the first elastic member is arranged between the limiting portion and the abutting boss for providing an elastic force to the abutting boss in a direction from the second valve port to the first valve port.

[0009] Furthermore, the inner wall of the accommodating cavity has a first limiting surface and a second limiting surface arranged at axial intervals along the valve needle assembly, and the limiting portion is movably arranged between the first limiting surface and the second limiting surface. The first limiting surface is located on the side of the limiting portion close to the first elastic member, and the second limiting surface is located on the side of the limiting portion close to the second elastic member. When the first valve port and the second valve port are both in an open state, the distance between the limiting portion and the first limiting surface is equal to the distance between the limiting portion and the second limiting surface.

[0010] Furthermore, the second valve needle includes a connecting sleeve and a valve needle body, the sealing member is arranged at one end of the valve needle body away from the connecting sleeve, the first valve needle is connected to the valve needle body through the connecting sleeve, and the inner wall of the connecting sleeve cooperates with the valve needle body to form an accommodating cavity.

[0011] Furthermore, the first elastic member and the second elastic member are both in a compressed state.

[0012] Furthermore, the three-way valve also includes a valve seat assembly, which is arranged on the valve body assembly, and the valve needle assembly is inserted into the valve seat assembly. The valve seat assembly has a guide portion, and the end of the second valve needle away from the sealing member has a mating portion, and at least part of the mating portion is movably arranged in the guide portion to guide the movement of the valve needle assembly.

[0013] Furthermore, the outer wall of the mating part and the inner wall of the guide part are sealed together, and a balancing channel is provided on the valve needle assembly. One end of the balancing channel is connected with the guide part. When the blocking part blocks the first valve port, the other end of the balancing channel is connected with the second flow port and the third flow port. When the blocking part blocks the second valve port, the other end of the balancing channel is connected with the third flow port.

[0014] Furthermore, the inner diameter of the guide portion is D1, the inner diameter of the first valve port is D2, the inner diameter of the second valve port is D3, and D1 = D2 = D3.

[0015] Further, the outer peripheral edge of one side of the first valve port facing the second valve port has a first sealing boss, and the outer peripheral edge of one side of the second valve port facing the first valve port has a second sealing boss. When the plugging member is in sealing fit with the first sealing boss and the second sealing boss, an annular sealing ring is formed.

[0016] Further, the inner wall of the first sealing boss has a first diameter-changing section, and the inner diameter of the first diameter-changing section gradually increases along the direction from the first valve port to the second valve port. The inner wall of the second sealing boss has a second diameter-changing section, and the inner diameter of the second diameter-changing section gradually decreases along the direction from the first valve port to the second valve port.

[0017] Further, the elastic coefficients K of the first elastic member and the second elastic member need to satisfy:

[0018] Specification PN280107DUNANRG

[0019] When 2Fx / △h - 2Fy / △h ≤ 0, 2Fx / △h ≤ K ≤ 2Fy / △h; when 2Fx / △h - 2Fy / △h > 0, 2Fx / △h ≥ K ≥ 2Fy / △h, where Fx = △P1 * |(πDx 2 / 4 - πD1 2 / 4)|, Fy = △P2 * |(πDy 2 / 4 - πD1 2 / 4)|, △P1 is the pressure difference on both sides of the plugging member when the plugging member plugs the first valve port, △P2 is the pressure difference on both sides of the plugging member when the plugging member plugs the second valve port, Dx is the diameter of the sealing fit between the plugging member and the first valve port, Dy is the diameter of the sealing fit between the plugging member and the second valve port, D1 is the inner diameter of the guiding portion, and △h is the instantaneous displacement distance allowed for the plugging member when opening the first valve port or the second valve port.

[0020] Applying the technical solution of the present invention, when the plugging member plugs the first valve port, the second flow port can be connected to the first flow port; when the plugging member plugs the second valve port, the second flow port can be connected to the third flow port. By driving the plugging member to move between the first valve port and the second valve port through the valve needle assembly to plug or open the first valve port and the second valve port, the flow path switching function of the three-way valve can be realized. Moreover, the first elastic force exerted by the first elastic member on the second valve needle is equal to the second elastic force exerted by the second elastic member on the second valve needle. In this way, the pre-tightening force when the plugging member plugs the first valve port can be equal to the pre-tightening force when the plugging member plugs the second valve port. While ensuring the plugging effect of the plugging member, it can ensure that the valve opening ability of the solenoid valve at the first valve port and the second valve port is consistent, facilitating the regulation of the valve opening performance so as to improve the valve opening ability of the three-way valve. Brief Description of the Drawings

[0021] 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:

[0022] Figure 1 The figure shows a schematic structural diagram of the three-way valve provided by the present invention when the first valve port is blocked;

[0023] Figure 2 The figure shows the structure of the three-way valve provided by the present invention when the second valve port is blocked;

[0024] Figure 3 Shows a schematic structural diagram of the valve needle assembly provided by the utility model;

[0025] Figure 4 Shown Figure 1 A partial enlarged view of point A in the middle;

[0026] Figure 5 Shown Figure 2 A partial enlarged view of point B in the middle;

[0027] Figure 6 Shows a schematic structural diagram of the valve needle body provided by the utility model;

[0028] Figure 7 A schematic diagram showing the dimensional relationship of the three-way valve provided by the present invention when blocking the first valve port is shown;

[0029] Figure 8 A schematic diagram showing the dimensional relationship of the three-way valve provided by the present invention when blocking the second valve port is shown;

[0030] Figure 9 Shown Figure 1 A partial enlarged view of point C in the middle;

[0031] Figure 10 Shown Figure 2 A partial enlarged view of point D in the middle;

[0032] Figure 11 Shown Figure 9 A partial enlarged view of point E in the middle;

[0033] Figure 12 Shown Figure 10 A partial enlarged view of point F in the middle;

[0034] Figure 13 Shows a structural schematic diagram of the valve seat assembly provided by the utility model;

[0035] Figure 14 Shows a schematic structural diagram of the guide sleeve provided by the utility model;

[0036] Figure 15 Shows a schematic structural diagram of the fixing member provided by the utility model;

[0037] Figure 16 The figure shows a schematic structural diagram of the first valve needle provided by the present invention.

[0038] The above drawings include the following reference numerals:

[0039] 100. Valve body assembly;

[0040] 110, circulation cavity; 111, first circulation port; 112, second circulation port; 113, third circulation port;

[0041] 101, first valve port; 1011, first sealing boss; 1012, first diameter-reducing section;

[0042] 102, second valve port; 1021, second sealing boss; 1022, second diameter-reducing section;

[0043] 200, valve needle assembly;

[0044] 201, first elastic member; 202, second elastic member;

[0045] 210, first valve needle; 211, limiting portion; 212, first section;

[0046] 220, second valve needle;

[0047] 221, connecting sleeve;

[0048] 222, valve needle body; 2221, connecting section; 22211, stop boss; 2222, body section; 2223, mounting section; 22231, stop boss; 22232, mounting boss;

[0049] 231, first limiting surface; 232, second limiting surface; 233, abutting boss;

[0050] 300, valve seat assembly; 301, guide portion;

[0051] 310, connecting seat; 311, limiting protrusion;

[0052] 320, guide sleeve; 321, plug-in section; 3211, second section; 322, extension section;

[0053] 330, fixing piece; 331, mounting hole;

[0054] 340, seals;

[0055] 400, blocking parts;

[0056] manual PN280107DUNANRG

[0057] 500, drive assembly;

[0058] 510, rotor; 520, screw;

[0059] 600, balanced channel;

[0060] 601, first balancing hole; 602, second balancing hole. DETAILED DESCRIPTION

[0061] 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.

[0062] like Figure 1 and Figure 2As shown, an embodiment of the present invention provides a three-way valve, which includes a valve body assembly 100 and a valve needle assembly 200. The valve body assembly 100 has a flow chamber 110, which has a first flow port 111, a second flow port 112, and a third flow port 113 arranged in sequence. A first valve port 101 is provided between the first flow port 111 and the second flow port 112, and the first flow port 111 and the second flow port 112 are connected through the first valve port 101. A second valve port 102 is provided between the second flow port 112 and the third flow port 113, and the second flow port 112 and the third flow port 113 are connected through the second valve port 102. The valve needle assembly 200 is movably disposed in the flow chamber 110. A sealing member 400 is provided on the valve needle assembly 200. The sealing member 400 is movably disposed 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. In which, the valve needle assembly 200 has a first valve needle 210 and a second valve needle 220 connected in sequence, and a sealing member 400 is provided at the end of the second valve needle 220 away from the first valve needle 210, and a first elastic member 201 and a second elastic member 202 are provided between the first valve needle 210 and the second valve needle 220. When the sealing 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. When the sealing 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 second elastic force toward the second valve port 102, and the first elastic force is equal to the second elastic force.

[0063] Apply the technical solution of this utility model, such as Figure 1 As shown, when the blocking member 400 blocks the first valve port 101, the second flow port 112 can communicate with the third flow port 113; Figure 2 As shown, when the blocking member 400 blocks the second valve port 102, the second flow port 112 can communicate with the first flow port 111. The valve needle assembly 200 drives the blocking member 400 to move between the first valve port 101 and the second valve port 102, thereby blocking or opening the first valve port 101 and the second valve port 102, thereby realizing the flow channel switching function of the three-way valve. In addition, the first elastic force applied by the first elastic member 201 to the second valve needle 220 is equal to the second elastic force applied by the second elastic member 202 to the second valve needle 220. This ensures that the preload force of the blocking member 400 when blocking the first valve port 101 is equal to the preload force when blocking the second valve port 102. While ensuring the blocking effect of the blocking member 400, it can also ensure that the valve opening capacity of the solenoid valve at the first valve port 101 and the second valve port 102 are consistent, facilitating the regulation of valve opening performance and improving the valve opening capacity of the three-way valve.

[0064] Furthermore, the elastic coefficients of the first elastic member 201 and the second elastic member 202 provided in the present application are set to be equal. In this way, when the first elastic member 201 and the second elastic member 202 block the two valve ports, it is only necessary to ensure that the expansion and contraction amounts of the first elastic member 201 and the second elastic member 202 are consistent to ensure that the first elastic force is equal to the second elastic force, which is convenient for setting the positions of the first elastic member 201 and the second elastic member 202.

[0065] Optionally, the first elastic member 201 and the second elastic member 202 in the present application may be configured as springs or other forms of elastic members.

[0066] Specifically, in the present application, the end of the second valve needle 220 away from the blocking member 400 has an accommodating cavity, into which at least a portion of the first valve needle 210 is inserted. The end of the first valve needle 210 located in the accommodating cavity has a stopper 211 to limit the displacement of the first valve needle 210 within the accommodating cavity. Through this arrangement, the stopper 211 can limit the range of movement of the first valve needle 210 and, by cooperating with the accommodating cavity, can also achieve the connection between the first valve needle 210 and the second valve needle 220.

[0067] 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 circumference of the first valve needle 210 .

[0068] Reference Figures 3 to 5 As shown, the first elastic member 201 is disposed on a side of the limiting portion 211 away from the blocking member 400, and the second elastic member 202 is disposed on a side of the limiting portion 211 closer to the blocking member 400. Through this arrangement, the second elastic member 202 can cooperate with the first valve needle 210 to provide an elastic force for the first valve needle 210 and the second valve needle 220 to move away from each other. When the blocking member 400 blocks the second valve port 102, the blocking member 400 is provided with a pre-tightening force toward the second valve port 102.

[0069] Furthermore, an abutment boss 233 is formed at one end of the accommodating cavity away from the blocking member 400. The first elastic member 201 is disposed between the limiting portion 211 and the abutment boss 233, and is configured to provide an elastic force to the abutment boss 233 in a direction from the second valve port 102 toward the first valve port 101. Through this arrangement, the first elastic member 201 can cooperate with the second valve needle 220 to provide an elastic force for the first valve needle 210 and the second valve needle 220 to move toward each other. When the blocking member 400 blocks the first valve port 101, the blocking member 400 is provided with a preload force toward the first valve port 101.

[0070] Specifically, such as Figure 4 and Figure 5As shown, the inner wall of the accommodating cavity has a first limiting surface 231 and a second limiting surface 232 arranged at axial intervals along the valve needle assembly 200, and the limiting portion 211 is movably arranged between the first limiting surface 231 and the second limiting surface 232. The first limiting surface 231 is located on the side of the limiting portion 211 close to the first elastic member 201, and the second limiting surface 232 is located on the side of the limiting portion 211 close to the second elastic member 202. When the sealing member 400 is in contact with the second valve opening 102, the first valve needle 210 is pressed against the second limit surface 232, and the second valve needle 220 is pushed toward the second valve opening 102 by the second elastic member 202. When the sealing member 400 contacts and blocks the second valve opening 102, the limit portion 211 can continue to move toward the second limit surface 232 until the limit portion 211 contacts 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 opening 102. When a valve port 101 moves, the first valve needle 210 first moves toward the side of the first limit 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. When the blocking member 400 abuts and blocks the first valve port 101, the limiting portion 211 can continue to move toward the first limit surface 231 until the limiting portion 211 contacts the first limit 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.

[0071] In addition, in the present application, when the first valve port 101 and the second valve port 102 are both in the open state, that is, when the blocking member 400 is located between the first valve port 101 and the second valve port 102, the distance between the limiting portion 211 and the first limiting surface 231 is equal to the distance between the limiting portion 211 and the second limiting surface 232, that is, when the limiting portion 211 abuts against the first limiting surface 231 or the second limiting surface 232, the displacement distances are equal, and when the elastic coefficients of the first elastic member 201 and the second elastic member 202 are equal, the values ​​of the elastic changes when the first elastic member 201 and the second elastic member 202 are compressed or stretched are equal, so as to ensure that the first elastic force is equal to the second elastic force, so that the valve opening capabilities of the three-way valve at the first valve port 101 and the second valve port 102 are consistent, so as to facilitate the regulation of the valve opening performance.

[0072] For ease of understanding, in this application, the elastic coefficients of the first elastic member 201 and the second elastic member 202 are set to k. When the limiting portion 211 moves and abuts against the first limiting surface 231 or the second limiting surface 232, the displacement of the limiting portion 211 is x. After the limiting portion 211 moves and abuts against the first limiting surface 231, the first elastic member 201 is compressed, and the elastic force increases by kx. The second elastic member 202 is released, and the elastic force decreases by kx, that is, When the blocking member 400 blocks the first valve port 101, the pre-tightening force of the blocking member 400 on the first valve port 101 is 2kx; similarly, after the limiting portion 211 moves and abuts against the second limiting surface 232, the second elastic member 202 is compressed, and the elastic force increases by an amount kx, and the first elastic member 201 is released, and the elastic force decreases by an amount kx, that is, when the blocking member 400 blocks the second valve port 102, the pre-tightening force of the blocking member 400 on the second valve port 102 is also 2kx.

[0073] Specifically, in the present application, the first elastic member 201 and the second elastic member 202 are both in a compressed state. Through the above arrangement, the influence of gravity and friction on the second valve needle 220 can be eliminated as much as possible, thereby ensuring that when the blocking member 400 blocks the first valve port 101 or the first valve port 101, the displacement of the limiting portion 211 between the first limiting surface 231 and the second limiting surface 232 is the same, thereby ensuring that the preload force applied to the blocking member 400 when blocking the first valve port 101 and the second valve port 102 is the same.

[0074] Furthermore, the first elastic member 201 and the second elastic member 202 are elastic members made of the same material. Through the above arrangement, the first elastic member 201 and the second elastic member 202 can be installed using the same material, which facilitates the production of the integral three-way valve.

[0075] Specifically, the second valve needle 220 includes a connecting sleeve 221 and a valve needle body 222. The sealing member 400 is disposed at the end of the valve needle body 222 away from the connecting sleeve 221. The first valve needle 210 is connected to the valve needle body 222 via the connecting sleeve 221. The inner wall of the connecting sleeve 221 cooperates with the valve needle body 222 to form a receiving cavity. Through this arrangement, the second valve needle 220 can form a separate structure with the connecting sleeve 221 and the valve needle body 222, facilitating the installation of the first and second valve needles 210 and 220, as well as the placement of the first and second elastic members 201 and 202. 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 first inserted into the connecting sleeve 221, and then the valve needle body 222 and the connecting sleeve 221 are connected.

[0076] Furthermore, the valve needle body 222 has a first end and a second end disposed opposite each other. The first end is provided with a sealing member 400, and the second end is configured to connect to the first valve needle 210. 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. In conventional technical solutions, to achieve both the sealing and connection capabilities of the valve needle, complex mounting and connection structures are typically provided at both ends of the valve needle. Prior to machining, the two ends must be clamped separately by a fixture, and the other end must be machined after the clamping is stable. However, this results in the valve needle extending too far from the fixture, making the clamping unstable. 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 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. This ensures the stability of the fixture's clamping of the valve needle body 222, and ensures the machining accuracy and quality of various parts of the valve needle body 222.

[0077] like Figure 3 and Figure 6 As shown, along the direction from the second end to the first end of the second valve needle 220, the second valve needle 220 has a connecting section 2221, a body section 2222, and a mounting section 2223, which are arranged in sequence. The connecting section 2221 is used to connect to the first valve needle 210, 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 second valve needle 220 within the flow chamber 110, ensuring the volume of the flow chamber 110. This, in turn, reduces the impact of the second valve needle 220 on fluid flow, ensuring the fluid flow capacity within the flow chamber 110.

[0078] Specifically, the mounting section 2223 includes a stop boss 22231 and a mounting boss 22232, arranged in a stepped manner 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] Specifically, the second valve needle 220 includes a connecting sleeve 221 and a valve needle body 222 that are interconnected. The valve needle body 222 has a connecting section 2221, a body section 2222 and an installation section 2223. The connecting sleeve 221 is used to connect the first valve needle 210 and the second valve needle 220. The connecting section 2221 and the connecting sleeve 221 are plugged into each other. The outer wall of the connecting section 2221 has a ring-shaped stop protrusion 22211. 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. Through the above-mentioned setting, 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, thereby ensuring that the distance between the first limiting surface 231 and the second limiting surface 232 is fixed, thereby ensuring the overall installation effect and use effect of the second valve needle 220.

[0083] 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 .

[0084] In a specific embodiment of the present application, a flow-guiding structure is provided on the stop boss 22231 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 within the flow chamber 110 and ensuring efficient flow of the fluid within the flow chamber 110.

[0085] 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.

[0086] In a specific embodiment of the present application, the cone angle of the conical section is α, and 130°≤α≤160°. When α is less than 130° or α is greater than 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°.

[0087] 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.

[0088] Specifically, in this application, the three-way valve further includes a valve seat assembly 300, which is mounted on the valve body assembly 100. The valve needle assembly 200 is disposed within the valve seat assembly 300. The valve seat assembly 300 has a guide portion 301. The end of the second valve needle 220, distal from the blocking member 400, has a mating portion, at least a portion of which is movably disposed within the guide portion 301 to guide the movement of the valve needle assembly 200. This arrangement allows the valve seat assembly 300 to guide the movement of the valve needle assembly 200, ensuring that the valve needle assembly 200 can correspond to the first valve port 101 and the second valve port 102, thereby ensuring the effectiveness of the three-way valve. Specifically, the mating portion is formed by the outer wall of the connecting sleeve 221.

[0089] Specifically, the outer wall of the mating part and the inner wall of the guide part 301 are sealed together, and a seal 340 is provided between the outer wall of the mating part and the inner wall of the guide part 301. Through the above arrangement, the fluid can be prevented from leaking to the outside through the gap between the mating part and the guide part 301, thereby reducing the internal leakage of the three-way valve and improving the use effect of the three-way valve.

[0090] Optionally, the sealing member 340 may be a sealing ring.

[0091] Optionally, a sealing groove may be provided on the inner side wall of the guide portion 301 or the outer side wall of the matching portion to accommodate the sealing member 340 .

[0092] Preferably, the sealing groove is provided on the outer side wall of the matching portion to facilitate the processing and forming of the sealing groove.

[0093] In the present application, a balancing channel 600 is provided on the valve needle assembly 200, one end of the balancing channel 600 is connected to the guide portion 301, and when the blocking member 400 blocks the first valve port 101, the other end of the balancing channel 600 is connected to the second flow port 112 and the third flow port 113, and when the blocking member 400 blocks the second valve port 102, the other end of the balancing channel 600 is connected to the third flow port 113. Specifically, a back pressure chamber is formed between the sealing member 340 and the guide portion 301, an upper flow chamber is formed between the first flow port 111 and the second flow port 112, and a lower flow chamber is formed between the second flow port 112 and the third flow port 113. When the blocking member 400 blocks the first valve port 101, the balancing channel 600 can connect the lower flow chamber and the back pressure chamber; when the blocking member 400 blocks the second valve port 102, the balancing channel 600 can connect the third flow port 113 and the back pressure chamber, so that the fluid pressure at both ends of the valve needle assembly 200 is the same, reducing or avoiding the pressure difference force at both ends of the valve needle assembly 200, and facilitating the valve opening of the valve needle assembly 200.

[0094] Specifically, refer to Figure 7 and Figure 8 As shown, the inner diameter of the guide portion 301 is D1, the inner diameter of the first valve port 101 is D2, and the inner diameter of the second valve port 102 is D3, where D1 = D2 = D3. With this arrangement, when the blocking member 400 blocks the first valve port 101, the second flow port 112 and the third flow port 113 communicate, allowing fluid at the third flow port 113 to enter the guide portion 301 through the balancing channel 600. Because the inner diameter D1 of the guide portion 301 is equal to the inner diameter D2 of the first valve port 101, the upward and downward fluid pressures acting on the valve needle assembly are equal, and the force-bearing areas are also the same, thus balancing the fluid pressures acting on the valve needle assembly. When the blocking member 400 blocks the second valve port 102, the first flow port 111 and the second flow port 112 are connected, and the fluid in the flow cavity 110 can enter the back pressure cavity formed between the sealing member 340 and the guide portion 301 through the balancing channel 600. Since the inner diameter D1 of the guide portion 301 is equal to the inner diameter D3 of the second valve port 102, the upward and downward fluid pressures on the valve needle assembly are the same, and the force areas are also the same. The fluid pressure on the valve needle assembly is balanced, ensuring the force balance at both ends of the valve needle assembly 200, thereby improving the valve opening ability.

[0095] Specifically in this application, Figure 3 As shown, the valve needle body 222 has a first balancing hole 601 provided therethrough. Figure 14 As shown, a plurality of second balancing holes 602 are provided on the limiting portion 211, and there is a gap between the abutting boss 233 and the side wall of the first valve needle 210. The first balancing hole 601, the second balancing hole 602 and the gap between the abutting boss 233 and the side wall of the first valve needle 210 cooperate to form a balancing channel 600.

[0096] In this application, the outer diameter of the plugging member 400 is greater than the maximum diameter of the second valve needle 220 of the valve needle assembly. The plugging member 400 has a first end face and a second end face that are oppositely arranged 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. Through the above arrangement, the plugging member 400 can be in sealing cooperation with the first valve port 101 and the second valve port 102 through the end faces, increasing the area of the plugging member 400 for sealing, ensuring the sealing effect of the plugging member 400, and reducing the internal leakage of the three-way valve.

[0097] Further, as shown in Figure 9 and Figure 10 , the outer peripheral edge of the side of the first valve port 101 facing the second valve port 102 has a first sealing boss 1011, and the outer peripheral edge of the side of the second valve port 102 facing the first valve port 101 has a second sealing boss 1021. When the plugging member 400 is in sealing cooperation with the first sealing boss 1011 and the second sealing boss 1021, an annular sealing ring is formed. Through the above arrangement, when the plugging member 400 plugs the first valve port 101 and the second valve port 102, a complete and uninterrupted sealing shape can be provided in the circumferential direction, so as to reduce the influence of defects that may occur due to processing errors of the plugging member 400 or the first valve port 101 and the second valve port 102 on the sealing effect, and ensure the sealing effect and service effect of the three-way valve.

[0098] Specifically, as shown in Figure 11 and Figure 12 , the inner wall of the first sealing boss 1011 has a first diameter-changing section 1012, and the inner diameter of the first diameter-changing section 1012 gradually increases along the direction from the first valve port 101 to the second valve port 102. The inner wall of the second sealing boss 1021 has a second diameter-changing section 1022, and the inner diameter of the second diameter-changing section 1022 gradually decreases along the direction from the first valve port 101 to the second valve port 102. Through the above arrangement, the wall thickness of the first sealing boss 1011 at the first diameter-changing section 1012 and the wall thickness of the second sealing boss 1021 at the second diameter-changing section 1022 can gradually decrease, thereby ensuring that an annular sealing ring can be formed when the plugging member 400 is in sealing cooperation with the first sealing boss 1011 and the second sealing boss 1021.

[0099] In this application, the elastic coefficients K of the first elastic member 201 and the second elastic member 202 need to satisfy that when 2Fx / △h - 2Fy / △h ≤ 0, 2Fx / △h ≤ K ≤ 2Fy / △h, and when 2Fx / △h - 2Fy / △h > 0, 2Fx / △h ≥ K ≥ 2Fy / △h, where Fx = △P1 * |πDx 2 / 4 - πD1 2 / 4|, Fy = △P2 * |πDy 2 / 4 - πD1 2 / 4|, △P1 is the pressure difference on both sides of the plugging member 400 when the plugging member 400 plugs the first valve port 101, △P2 is the pressure difference on both sides of the plugging member 400 when the plugging member 400 plugs the second valve port 102, Dx is the diameter of the sealing fit between the plugging member 400 and the first valve port 101, Dy is the diameter of the sealing fit between the plugging member 400 and the second valve port 102, D1 is the inner diameter of the guiding portion 301, and △h is the instantaneous displacement distance allowed for the plugging member 400 when opening the first valve port 101 or the second valve port 102. During the use of the linear sealing fit, it will cause a partial unbalanced state of the internal balance structure due to tolerance factors. For example, when the plugging member 400 plugs the first valve port 101, the diameter Dx of the annular sealing ring actually formed by the cooperation between the plugging member 400 and the first sealing boss 1011 is between the inner diameter of the first valve port 101 and the maximum inner diameter of the first sealing boss 1011. When the plugging member 400 plugs the second valve port 102, the diameter Dy of the annular sealing ring actually formed by the cooperation between the plugging member 400 and the second sealing boss 1021 is between the inner diameter of the second valve port 102 and the maximum inner diameter of the second sealing boss 1021, resulting in unequal pressures on the connecting sleeve 221 and the plugging member 400. At this time, the unbalanced force Fx on the plugging member 400 at the first valve port 101 = △P * |πDx 2 / 4 - πD1 2 / 4|, the unbalanced force Fy on the plugging member 400 at the second valve port 102 = △P * |πDy 2 / 4 - πD1 2 / 4|. In order to prevent the excessive compression of the first elastic member​​​​​​​​​​As shown, the valve seat assembly 300 has a connecting seat 310 and a guide sleeve 320. The connecting seat 310 is sleeved on the outside of the guide sleeve 320. The connecting seat 310 is fixedly connected to the valve body assembly 100. The valve needle assembly 200 is inserted into the guide sleeve 320. The guide sleeve 320 can guide the movement of the valve needle assembly 200. A first anti-rotation structure is provided between the inner wall of the guide sleeve 320 and the valve needle assembly 200 to limit the circumferential rotation of the valve needle assembly 200. A second anti-rotation structure is provided between the connecting seat 310 and the guide sleeve 320 to limit the relative rotation of the guide sleeve 320 relative to the connecting seat 310. Through the above-mentioned setting, the guide sleeve 320 can drive the valve needle assembly 200 through the first anti-rotation structure and the screw 520, and can also limit the rotation of the guide sleeve 320 relative to the connecting seat 310 through the second anti-rotation structure, ensuring that the guide sleeve 320 will not rotate relative to the valve needle assembly 200, so as to improve the guiding effect of the guide sleeve 320 on the valve needle assembly 200.

[0103] It should be noted that in the present application, the rotation of the valve needle assembly 200 is converted into linear motion by providing a guide sleeve 320, which can reduce the friction of the seal 340 relative to the guide part 301, increase the service life of the seal 340, and reduce the probability of a gap between the seal 340 and the inner wall of the guide part 301.

[0104] Specifically, the valve seat assembly 300 further includes a fixing member 330, through which the guide sleeve 320 is fixedly disposed within the connecting seat 310. The fixing member 330 has a mounting hole 331, through which the guide sleeve 320 is inserted. The second anti-rotation structure is disposed between the inner wall of the mounting hole 331 and the outer wall of the guide sleeve 320. Through this arrangement, the fixing member 330 can achieve a fixing effect on the guide sleeve 320 while also preventing the guide sleeve 320 from rotating, thereby ensuring a stable fit between the guide sleeve 320 and the screw 520.

[0105] In a specific implementation of this application, Figure 14 and Figure 15 As shown, the guide sleeve 320 includes an inserting section 321, which is inserted into the mounting hole 331. A second cut surface 3211 is provided on the side wall of the inserting section 321. The shape of the mounting hole 331 matches the cross-sectional shape of the inserting section 321 along the axial direction. The mounting hole 331 and the second cut surface 3211 cooperate to form a second anti-rotation structure. With this arrangement, after the inserting section 321 is inserted into the mounting hole 331, the second cut surface 3211 can cooperate with the shape of the inner wall of the mounting hole 331 to prevent the guide sleeve 320 from rotating.

[0106] Furthermore, a plurality of second cut surfaces 3211 may be provided, and the plurality of second cut surfaces 3211 are arranged in an annular shape, so as to improve the anti-rotation effect of the second cut surface 3211 .

[0107] Furthermore, the plurality of second cross-sections 3211 may be arranged to form a regular polygon, so that when the guide sleeve 320 and the fixing member 330 are connected, there is no need to align the second cross-sections 3211 and the mounting hole 331 , thereby improving the installation efficiency.

[0108] In other optional embodiments of the present application, the second anti-rotation structure can be set as a fixed protrusion structure, as long as it can achieve the effect of limiting the rotation of the guide sleeve 320.

[0109] Specifically, if Figure 16 As shown, the outer wall of the guide sleeve 320 of the valve needle assembly 200 is provided with a first cut surface 212. The inner wall of the guide sleeve 320 matches the outer wall of the valve needle assembly 200 in shape. The first cut surface 212 cooperates with the inner wall of the guide sleeve 320 to form a first anti-rotation structure. This arrangement prevents the guide sleeve 320 from rotating due to the first cut surface 212. Similarly, the first cut surface 212 can be provided with multiple second cut surfaces 3211 arranged in an annular pattern to enhance the anti-rotation effect of the first cut surface 212.

[0110] In the present application, the guide sleeve 320 includes an interconnected extension section 322 and a plug section 321. The plug section 321 is inserted into the mounting hole 331. The outer diameter of the plug section 321 is smaller than the outer diameter of the extension section 322. A stepped surface is formed between the plug section 321 and the extension section 322. The stepped surface abuts against the fixing member 330 to limit the displacement of the guide sleeve 320 toward the valve port. This arrangement allows the fixing member 330 to limit the rotation of the guide sleeve 320 while also providing a lower limit for the fixing member 330, thereby ensuring the stability of the guide sleeve 320 when installed in the connecting seat 310 and preventing the guide sleeve 320 from axial movement.

[0111] Furthermore, a limiting protrusion 311 is provided on the inner wall of the connecting seat 310. The end surface of the guide sleeve 320 away from the valve port abuts against the limiting protrusion 311 to limit the displacement of the guide sleeve 320 away from the valve port. This arrangement allows the limiting protrusion 311 to achieve an upper limit on the guide sleeve 320, ensuring the stability of the installation of the guide sleeve 320. The limiting protrusion 311 also provides a positioning reference for the guide sleeve 320 during installation, facilitating the installation of the guide sleeve 320.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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 three-way valve, characterized in that: The three-way valve comprises: A valve body assembly (100) comprises a circulation cavity (110), wherein the circulation cavity (110) comprises 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); 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); the second circulation port (112) and the third circulation port (113) are communicated through the second valve port (102); a valve needle assembly (200) movably disposed in the circulation chamber (110); a blocking member (400) is disposed on the valve needle assembly (200); the blocking member (400) is movably disposed 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); Wherein, the valve needle assembly (200) has a first valve needle (210) and a second valve needle (220) connected in sequence, the sealing member (400) is provided at one end of the second valve needle (220) away from the first valve needle (210), and a first elastic member (201) and a second elastic member (202) are provided between the first valve needle (210) and the second valve needle (220). When the sealing 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 in the direction of the first valve port (101). When the sealing 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 second elastic force in the direction of the second valve port (102), and the first elastic force is equal to the second elastic force.

2. The three-way valve according to claim 1, characterized in that: The elastic coefficients of the first elastic member (201) and the second elastic member (202) are equal.

3. The three-way valve according to claim 2, characterized in that: The second valve needle (220) has an accommodating cavity at one end away from the sealing member (400), and at least a portion of the first valve needle (210) is inserted into the accommodating cavity. The first valve needle (210) has a limiting portion (211) at one end of the accommodating cavity, and the limiting portion (211) is used to limit the displacement of the first valve needle (210) in the accommodating cavity. The first elastic member (201) is arranged on a side of the limiting portion (211) away from the sealing member (400), and the second elastic member (202) is arranged on a side of the limiting portion (211) close to the sealing member (400).

4. The three-way valve according to claim 3, characterized in that: An end of the accommodating cavity away from the blocking member (400) has an abutting boss (233), and the first elastic member (201) is arranged between the limiting portion (211) and the abutting boss (233) and is used to provide an elastic force to the abutting boss (233) in a direction from the second valve port (102) to the first valve port (101).

5. The three-way valve according to claim 3, characterized in that: The inner wall of the accommodating cavity has a first limiting surface (231) and a second limiting surface (232) arranged at intervals along the axial direction of the valve needle assembly (200), and the limiting portion (211) is movably arranged between the first limiting surface (231) and the second limiting surface (232), the first limiting surface (231) is located on the side of the limiting portion (211) close to the first elastic member (201), and the second limiting surface (232) is located on the side of the limiting portion (211) close to the second elastic member (202), when the first valve port (101) and the second valve port (102) are both in an open state, the distance between the limiting portion (211) and the first limiting surface (231) is equal to the distance between the limiting portion (211) and the second limiting surface (232).

6. The three-way valve according to claim 3, characterized in that: The second valve needle (220) includes a connecting sleeve (221) and a valve needle body (222), the sealing member (400) is arranged at one end of the valve needle body (222) away from the connecting sleeve (221), the first valve needle (210) is connected to the valve needle body (222) through the connecting sleeve (221), and the inner wall of the connecting sleeve (221) cooperates with the valve needle body (222) to form the accommodating cavity.

7. The three-way valve according to claim 2, characterized in that: The first elastic member (201) and the second elastic member (202) are both in a compressed state.

8. The three-way valve according to claim 1, characterized in that: The three-way valve also includes a valve seat assembly (300), the valve seat assembly (300) is arranged on the valve body assembly (100), the valve needle assembly (200) is inserted into the valve seat assembly (300), the valve seat assembly (300) has a guide portion (301), and the end of the second valve needle (220) away from the sealing member (400) has a matching portion, and at least part of the matching portion is movably arranged in the guide portion (301) to guide the movement of the valve needle assembly (200).

9. The three-way valve according to claim 8, characterized in that: The outer wall of the mating portion is sealed with the inner wall of the guide portion (301), and a balancing channel (600) is provided on the valve needle assembly (200). One end of the balancing channel (600) is connected to the guide portion (301). When the blocking member (400) blocks the first valve port (101), the other end of the balancing channel (600) is connected to the second flow port (112) and the third flow port (113). When the blocking member (400) blocks the second valve port (102), the other end of the balancing channel (600) is connected to the third flow port (113).

10. The three-way valve according to claim 8, characterized in that The inner diameter of the guide portion (301) is D1, the inner diameter of the first valve port (101) is D2, and the inner diameter of the second valve port (102) is D3, where D1=D2=D3.

11. The three-way valve according to claim 8, characterized in that: The outer periphery of the first valve port (101) facing the second valve port (102) has a first sealing boss (1011), and the outer periphery of the second valve port (102) facing the first valve port (101) has a second sealing boss (1021), and the sealing member (400) forms an annular sealing ring when sealed with the first sealing boss (1011) and the second sealing boss (1021).

12. The three-way valve according to claim 11, characterized in that The inner wall of the first sealing boss (1011) has a first diameter-reducing section (1012), and the inner diameter of the first diameter-reducing section (1012) gradually increases along the direction from the first valve port (101) to the second valve port (102); the inner wall of the second sealing boss (1021) has a second diameter-reducing section (1022), and the inner diameter of the second diameter-reducing section (1022) gradually decreases along the direction from the first valve port (101) to the second valve port (102).

13. The three-way valve according to claim 10, characterized in that The elastic coefficient K of the first elastic member (201) and the second elastic member (202) needs to satisfy: When 2Fx / △h-2Fy / △h≤0, 2Fx / △h≤K≤2Fy / △h, When 2Fx / △h-2Fy / △h>0, 2Fx / △h≥K≥2Fy / △h, in, Fx = ΔP1 * |(πDx 2 / 4 - πD1 2 / 4)|, Fy = ΔP2 * |(πDy 2 / 4 - πD1 2 / 4)|, Δ P1 is the pressure difference on both sides of the blocking member (400) when the blocking member (400) blocks the first valve port (101), ΔP2 is the pressure difference on both sides of the blocking member (400) when the blocking member (400) blocks the second valve port (102), Dx is the diameter of the sealing fit between the blocking member (400) and the first valve port (101), Dy is the diameter of the sealing fit between the blocking member (400) and the second valve port (102), D1 is the inner diameter of the guide portion (301), and Δh is the instantaneous displacement distance allowed by the blocking member (400) when the first valve port (101) or the second valve port (102) is opened.

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