Three-way valve

Abstract

The utility model relates to the technical field of valves, in particular to a three-way valve. The three-way valve comprises a valve body assembly and a valve element. The valve body assembly is provided with a first valve cavity, a second valve cavity, a third valve cavity, a first valve port and a second valve port. The valve element is movably installed in the valve body assembly and is in sliding fit with the first valve port and the second valve port, and a fluid channel is formed in the valve element. The three-way valve has a first state, a second state and a third state along with sliding of the valve element. When the three-way valve is in a first state, the first valve cavity communicates with the second valve cavity through the fluid channel, and the first valve cavity and the second valve cavity are both disconnected from the third valve cavity. When the three-way valve is in a second state, the first valve cavity and the third valve cavity are communicated through the fluid channel, and the first valve cavity and the third valve cavity are both disconnected from the second valve cavity; and when the three-way valve is in a third state, the first valve cavity, the second valve cavity and the third valve cavity are all disconnected. According to the three-way valve, the problem that an existing three-way valve cannot achieve full closing of the circulation hole is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to a three-way valve. BACKGROUND

[0002] In the related art, a three-way valve usually has three flow-through holes, including an inlet A and two outlets B and C. The three-way valve switches the flow-through holes by driving a valve core with a motor, so that A is communicated with B and C is cut off, or A is communicated with C and B is cut off. That is, the three-way valve can only switch the flow-through holes and cannot achieve full closure, which limits the use of the three-way valve. CONTENT OF THE UTILITY MODEL

[0003] Therefore, it is necessary to provide a three-way valve to solve the problem that the existing three-way valve cannot achieve full closure of the flow-through holes.

[0004] The present application provides a three-way valve, which comprises a valve body assembly and a valve core. The valve body assembly is provided with a first valve cavity, a second valve cavity, a third valve cavity, a first valve port and a second valve port. The first valve cavity is located between the second valve cavity and the third valve cavity. The two ends of the first valve port are communicated with the first valve cavity and the second valve cavity, respectively. The two ends of the second valve port are communicated with the first valve cavity and the third valve cavity, respectively. The first valve cavity, the second valve cavity and the third valve cavity are connected with connecting pipes, respectively. The valve core is movably installed in the valve body assembly and is in sliding fit with the first valve port and the second valve port. A fluid passage is formed in the valve core. The three-way valve has a first state, a second state and a third state according to the sliding of the valve core. When the three-way valve is in the first state, the first valve cavity and the second valve cavity are communicated through the fluid passage, and the first valve cavity and the second valve cavity are both disconnected with the third valve cavity. When the three-way valve is in the second state, the first valve cavity and the third valve cavity are communicated through the fluid passage, and the first valve cavity and the third valve cavity are both disconnected with the second valve cavity. When the three-way valve is in the third state, the first valve cavity, the second valve cavity and the third valve cavity are all disconnected.

[0005] In one of the embodiments, the fluid passage comprises a first passage, a second passage, a first flow hole and a second flow hole, the first passage is communicated with the second valve cavity, and the first flow hole is communicated with the side wall of the first passage, the second passage is communicated with the third valve cavity, and the second flow hole is communicated with the side wall of the second passage; when the three-way valve is in the first state, the first flow hole is communicated with the first valve cavity, and the inner wall of the second valve port blocks the communication between the second flow hole and the first valve cavity; when the three-way valve is in the second state, the second flow hole is communicated with the first valve cavity, and the inner wall of the first valve port blocks the communication between the first flow hole and the first valve cavity; when the three-way valve is in the third state, the inner wall of the first valve port blocks the first flow hole, and the inner wall of the second valve port blocks the second flow hole.

[0006] In one of the embodiments, the fluid passage further comprises a third flow hole opened on the side wall of the valve core, the third flow hole is communicated with the first passage, and at least part of the third flow hole is arranged close to the second passage relative to the first flow hole, wherein the flow area of the third flow hole is smaller than the flow area of the first flow hole; and / or, the fluid passage further comprises a fourth flow hole opened on the side wall of the valve core, the fourth flow hole is communicated with the second passage, and at least part of the fourth flow hole is arranged close to the first passage relative to the second flow hole, wherein the flow area of the fourth flow hole is smaller than the flow area of the second flow hole.

[0007] In one of the embodiments, the third flow hole is opened on the inner wall of the side of the first flow hole close to the second passage; and / or, the fourth flow hole is opened on the inner wall of the side of the second flow hole close to the first passage.

[0008] In one of the embodiments, the outer side wall of the valve core is recessed towards the direction close to the axis of the valve core to form a first sealing groove, the first sealing groove is arranged close to the second passage relative to the first flow hole, and a first sealing member is installed in the first sealing groove, when the three-way valve is in the second state and the third state, the first sealing member is in sealing cooperation with the inner wall of the first valve port; and / or, the outer side wall of the valve core is recessed towards the direction close to the axis of the valve core to form a second sealing groove, the second sealing groove is arranged close to the first passage relative to the second flow hole, and a second sealing member is installed in the second sealing groove, when the three-way valve is in the first state and the third state, the second sealing member is in sealing cooperation with the inner wall of the second valve port.

[0009] In one of the embodiments, the first valve port is provided with a first guide surface near one end of the first valve cavity, and the inner diameter of the first guide surface has a gradually decreasing trend along the axial direction of the first valve port from the first valve cavity to the first valve port; and / or, the second valve port is provided with a second guide surface near one end of the first valve cavity, and the inner diameter of the second guide surface has a gradually decreasing trend along the axial direction of the second valve port from the first valve cavity to the second valve port.

[0010] In one of the embodiments, the distance from the position of the third state to the position of the second state of the spool is the upstroke of the spool, and the distance from the position of the third state to the position of the first state of the spool is the downstroke of the spool; wherein the size of the upstroke is equal to the size of the downstroke.

[0011] In one of the embodiments, during the movement of the spool, the first valve port and the second valve port are at least partially in contact with and slidingly fitted with the spool.

[0012] In one of the embodiments, the inner wall of the second valve port near one end of the third valve cavity protrudes in the direction close to the axis to form a lower limit portion, and when the spool moves to the limit in the direction close to the third valve cavity, one end of the spool in the axial direction is in abutting fitting with the lower limit portion; wherein when the spool is in abutting fitting with the lower limit portion, the three-way valve is in the first state.

[0013] In one of the embodiments, the three-way valve further comprises a core shaft assembly movably installed in the valve body assembly, and one end of the core shaft assembly is connected with the spool for driving the axial movement of the spool, and the core shaft assembly comprises a guide portion; the valve body assembly is further provided with an assembly hole, the assembly hole is arranged in the space between the first valve port and the second valve cavity and is in communication with the second valve cavity, and the inner wall of the assembly hole is in sliding fitting with the outer wall of the guide portion.

[0014] In one of the embodiments, the inner diameter of the first valve port, the inner diameter of the second valve port and the inner diameter of the assembly hole are equal.

[0015] In one of the embodiments, the inner wall of the assembly hole away from one end of the second valve cavity protrudes in the direction close to the axis to form an upper limit portion, and when the spool moves to the limit in the direction away from the second valve port, one end of the guide portion in the axial direction is in abutting fitting with the upper limit portion; wherein when the guide portion is in abutting fitting with the upper limit portion, the three-way valve is in the second state.

[0016] In one of the embodiments, the core shaft assembly further comprises a screw rod and a valve head, one end of the guide part is movably connected with the screw rod, and the other end is limitingly connected with the valve head; wherein the end of the valve head away from the screw rod is connected with the valve core.

[0017] In one of the embodiments, the valve core comprises a main body part and a partition plate, the partition plate is arranged in the main body part and connected with the main body part; wherein a connecting hole is arranged on the partition plate, and the end of the valve head away from the screw rod is inserted into the connecting hole and fixedly connected with the partition plate.

[0018] In one of the embodiments, the valve body assembly comprises a main valve body, a valve port part and an end cover, the valve port part is installed in the main valve body and separates the inside of the main valve body into the first valve cavity and the second valve cavity, and the end cover is connected to the end of the main valve body provided with the first valve cavity; wherein the first valve port is arranged on the valve port part, and the second valve port and the third valve cavity are arranged on the end cover.

[0019] In one of the embodiments, the valve body assembly further comprises a valve seat and a guide sleeve, the valve seat is connected to the end of the main valve body provided with the second valve cavity, and the guide sleeve is arranged in the second valve cavity and one end of the guide sleeve is inserted into and connected with the valve seat.

[0020] Compared with the prior art, the three-way valve provided by the application can open or close the first valve port and the second valve port through the sliding of the valve core, so as to make the first valve cavity and the second valve cavity communicate, the third valve cavity is in a disconnected state, or make the first valve cavity and the third valve cavity communicate, the second valve cavity is in a disconnected state, or the first valve cavity, the second valve cavity and the third valve cavity are all in a disconnected state, thus, the full-closing function of the three-way valve is realized, and the use scene is widened. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0022] Figure 1 A sectional view of the three-way valve provided by one of the embodiments of the application in a first state;

[0023] Figure 2 A sectional view of the three-way valve provided by one of the embodiments of the application in a second state;

[0024] Figure 3Cross-sectional view of a three-way valve according to an embodiment of the present application in a third state;

[0025] Figure 4 Structural diagram of a valve core according to an embodiment of the present application;

[0026] Figure 5 Cross-sectional view of a valve core according to an embodiment of the present application;

[0027] Figure 6 Structural diagram of a valve core according to another embodiment of the present application;

[0028] Figure 7 Structural diagram of a valve core according to still another embodiment of the present application;

[0029] Figure 8 Partial cross-sectional view of a three-way valve according to an embodiment of the present application (small flow rate);

[0030] Figure 9 Partial cross-sectional view of a three-way valve according to an embodiment of the present application (large flow rate);

[0031] Figure 10 Cross-sectional view of a core shaft assembly according to an embodiment of the present application;

[0032] Figure 11 Cross-sectional view of a valve port portion according to an embodiment of the present application;

[0033] Figure 12 Cross-sectional view of an end cap according to an embodiment of the present application;

[0034] Figure 13 Cross-sectional view of a valve seat according to an embodiment of the present application;

[0035] Figure 14 Cross-sectional view of a guide sleeve according to an embodiment of the present application.

[0036] The meanings of the respective symbols in the drawings are as follows:

[0037] 100, three-way valve; 10, valve body assembly; 11, main valve body; 111, first valve cavity; 112, second valve cavity; 113, first interface; 114, third interface; 115, third valve cavity; 12, valve port portion; 121, first valve port; 1211, first guide surface; 13, end cover; 131, second valve port; 1311, second guide surface; 1312, lower limiting portion; 132, second interface; 14, valve seat; 141, upper limiting portion; 15, guide sleeve; 151, assembly hole; 20, valve core; 21, first channel; 211, first flow-through hole; 212, third flow-through hole; 22, second channel; 221, second flow-through hole; 222, fourth flow-through hole; 23, first sealing groove; 231, first sealing member; 24, second sealing groove; 241, second sealing member; 25, main body portion; 26, partition; 261, connecting hole; 30, core shaft assembly; 31, guide portion; 311, mounting hole; 32, screw rod; 33, valve head; 34, bearing; 40, nut sleeve; 50, first connecting pipe; 60, second connecting pipe; 70, third connecting pipe. DETAILED DESCRIPTION

[0038] In order to make the above objectives, features and advantages of the present application more clear and easily understood, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different manners other than those described herein, and it is understood that similar modifications of the present application can be made by those skilled in the art without departing from the spirit and scope of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0039] It should be noted that when an element is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element, or intervening elements can also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions as used in the description of the specification are for the purpose of illustration only and do not indicate an exclusive embodiment.

[0040] In addition, the terms "first", "second", and the like, are used only to describe the elements and do not indicate or imply relative importance or a number of indicated technical features. Thus, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0041] In the present application, unless specifically defined and limited otherwise, the first feature is "on", "under", "above" or "over" the second feature, which can be that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the first feature is "above", "over" and "on" the second feature, which can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature is "below", "under" and "under" the second feature, which can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0042] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more related listed items.

[0043] In the related art, a three-way valve generally has three flow-through holes, including an inlet A and two outlets B and C, and the three-way valve switches the flow-through holes by driving a valve core with a motor, so that A is communicated with B and C is cut off, or A is communicated with C and B is cut off. That is, the three-way valve can only switch the flow-through holes, and cannot realize full closing, which limits the use of the three-way valve.

[0044] Please refer to Figures 1-14 To solve the problem that the existing three-way valve cannot realize full closing of the flow-through hole, the present application provides a three-way valve 100, which comprises a valve body assembly 10 and a valve core 20. The valve body assembly 10 is provided with a first valve cavity 111, a second valve cavity 112, a third valve cavity 115, a first valve port 121, a second valve port 131, a first interface 113, a second interface 132 and a third interface 114. The first valve cavity 111 is located between the second valve cavity 112 and the third valve cavity 115. The two ends of the first valve port 121 are respectively communicated with the first valve cavity 111 and the second valve cavity 112. The two ends of the second valve port 131 are respectively communicated with the first valve cavity 111 and the third valve cavity 115. The first valve cavity 111, the second valve cavity 112 and the third valve cavity 115 are respectively connected with a connecting pipe. Specifically, the first interface 113 is communicated with the side wall of the first valve cavity 111. The second interface 132 is communicated with one end of the third valve cavity 115 away from the first valve cavity 111. The third interface 114 is communicated with the side wall of the second valve cavity 112. The first interface 113 is connected with a first connecting pipe 50. The second interface 132 is connected with a second connecting pipe 60. The third interface 114 is connected with a third connecting pipe 70. Here, the first connecting pipe 50 can be used as an inlet pipe, and the second connecting pipe 60 and the third connecting pipe 70 can be used as outlet pipes.

[0045] Furthermore, the valve core 20 is movably installed within the valve body assembly 10, and the valve core 20 can be partially inserted into the first valve port 121 and the second valve port 131, and slides with both the first valve port 121 and the second valve port 131. A fluid channel is provided on the valve core 20.

[0046] The three-way valve 100 has a first state, a second state, and a third state as the valve core 20 slides. When the three-way valve 100 is in the first state, the first valve chamber 111 and the second valve chamber 112 are connected through a fluid channel, and both the first valve chamber 111 and the second valve chamber 112 are disconnected from the third valve chamber 115. When the three-way valve 100 is in the second state, the first valve chamber 111 and the third valve chamber 115 are connected through a fluid channel, and both the first valve chamber 111 and the third valve chamber 115 are disconnected from the second valve chamber 112. When the three-way valve 100 is in the third state, the first valve chamber 111, the second valve chamber 112, and the third valve chamber 115 are all disconnected.

[0047] It is understood that this application can open or close the first valve port 121 and the second valve port 131 by sliding the valve core 20, thereby connecting the first valve chamber 111 and the second valve chamber 112 and keeping the third valve chamber 115 in a closed state, or connecting the first valve chamber 111 and the third valve chamber 115 and keeping the second valve chamber 112 in a closed state, or keeping the first valve chamber 111, the second valve chamber 112 and the third valve chamber 115 all in a closed state. In this way, the three-way valve 100 is fully closed, thus expanding the application scenarios.

[0048] Specifically, the fluid passage includes a first passage 21, a second passage 22, a first flow hole 211, and a second flow hole 221. The first passage 21 communicates with the second valve chamber 112, and the first flow hole 211 communicates with the side wall of the first passage 21. The second passage 22 communicates with the third valve chamber 115, and the second flow hole 221 communicates with the side wall of the second passage 22. Thus, as the valve core 20 moves, the flow state of the three-way valve 100 can be changed through the first flow hole 211 and the second flow hole 221.

[0049] When the three-way valve 100 is in the first state, such as Figure 1 As shown, the valve core 20 moves to a position where the first flow hole 211 connects to the first valve chamber 111, and the inner wall of the second valve port 131 blocks the connection between the second flow hole 221 and the first valve chamber 111. At this time, the refrigerant entering the first valve chamber 111 from the first interface 113 can smoothly flow into the first channel 21 of the valve core 20 through the first flow hole 211, and further flow into the second valve chamber 112, and finally flow out from the third connector 70 at the third interface 114, thus forming a first flow path connecting the first connector 50 and the third connector 70, while the second flow path corresponding to the second connector 60 is in a cut-off state.

[0050] When the three-way valve 100 is in the second state, such as Figure 2 As shown, the valve core 20 moves to a position where the second flow hole 221 connects to the first valve chamber 111, and the inner wall of the first valve port 121 blocks the connection between the first flow hole 211 and the first valve chamber 111. At this time, the refrigerant entering the first valve chamber 111 from the first interface 113 can smoothly flow into the second channel 22 of the valve core 20 through the second flow hole 221, and further flow into the third valve chamber 115, and finally flow out from the second connector 60 at the second interface 132, thus forming a second flow path connecting the first connector 50 and the second connector 60, while the first flow path corresponding to the third connector 70 is in a cut-off state.

[0051] When the three-way valve 100 is in the third state, such as Figure 3 As shown, the valve core 20 moves to the position where the inner wall of the first valve port 121 blocks the first flow hole 211, and the inner wall of the second valve port 131 blocks the second flow hole 221. At this time, both flow paths in the three-way valve 100 are in the closed state, thereby enabling the three-way valve 100 to be fully closed.

[0052] In summary, this application creates a first channel 21 and a second channel 22 on the valve core 20, and creates a first flow hole 211 on the side wall of the first channel 21 and a second flow hole 221 on the side wall of the second channel 22. Thus, during the movement of the valve core 20, the outer wall of the valve core 20 can cooperate with the inner walls of the first valve port 121 and the second valve port 131 to open either the first flow hole 211 or the second flow hole 221, while the other remains closed, thereby achieving refrigerant flow through a single path. Alternatively, the first flow hole 211 may be blocked by the inner wall of the first valve port 121, and the second flow hole 221 may be blocked by the inner wall of the second valve port 131, thereby achieving full closure of the three-way valve 100.

[0053] To improve the sealing performance of the first valve port 121 in the second and third states, i.e., when the first valve port 121 is closed, in one embodiment, such as Figures 2-7 As shown, the outer wall of the valve core 20 is recessed towards its own axis to form a first sealing groove 23. The first sealing groove 23 is positioned relative to the first flow hole 211 and close to the second channel 22. A first sealing element 231 is installed in the first sealing groove 23. When the three-way valve 100 is in the second and third states, the first sealing element 231 seals against the inner wall of the first valve port 121. This prevents refrigerant from leaking from the gap between the first valve port 121 and the valve core 20, thereby improving the reliability of the three-way valve 100 during use.

[0054] Further, the first valve port 121 is provided with a first guide surface 1211 near one end of the first valve cavity 111. In the axial direction of the first valve port 121 and from the first valve cavity 111 to the first valve port 121, the inner diameter of the first guide surface 1211 has a gradually decreasing trend. In this way, during the movement of the valve core 20 towards the first valve port 121, the first sealing element 231 can more smoothly enter the first valve port 121 to achieve sealing, which on the one hand reduces the difficulty of movement of the valve core 20, and on the other hand can also avoid damage caused by excessive extrusion of the first sealing element 231 and the end of the first valve port 121, thereby improving the service life of the first sealing element 231.

[0055] To improve the sealing performance of the second valve port 131 in the first state and the third state, i.e., when the second valve port 131 is closed, in an embodiment, as shown in Figure 1 and Figures 3-7 the outer side wall of the valve core 20 is recessed to form a second sealing groove 24 towards the axis of the valve core 20. The second sealing groove 24 is arranged close to the first passage 21 relative to the second flow-through hole 221, and the second sealing groove 24 is provided with a second sealing element 241. When the three-way valve 100 is in the first state and the third state, the second sealing element 241 is in sealing cooperation with the inner wall of the second valve port 131. In this way, leakage of refrigerant from the gap between the second valve port 131 and the valve core 20 can be prevented, thereby improving the reliability of the three-way valve 100 during use.

[0056] Further, the second valve port 131 is provided with a second guide surface 1311 near one end of the first valve cavity 111. In the axial direction of the second valve port 131 and from the first valve cavity 111 to the second valve port 131, the inner diameter of the second guide surface 1311 has a gradually decreasing trend. In this way, during the movement of the valve core 20 towards the second valve port 131, the second sealing element 241 can more smoothly enter the second valve port 131 to achieve sealing, which on the one hand reduces the difficulty of movement of the valve core 20, and on the other hand can also avoid damage caused by excessive extrusion of the second sealing element 241 and the end of the second valve port 131, thereby improving the service life of the second sealing element 241.

[0057] In an embodiment, as shown in Figure 6 and Figure 7As shown, the fluid passage further comprises a third flow hole 212 formed on the side wall of the valve core 20, the third flow hole 212 is in communication with the first passage 21, and at least part of the third flow hole 212 is arranged close to the second passage 22 relative to the first flow hole 211, wherein the flow area of the third flow hole 212 is smaller than that of the first flow hole 211. In this way, during the movement of the valve core 20 towards the first state corresponding position, the communication between the first valve cavity 111 and the first passage 21 can be realized through the third flow hole 212 first, and since the flow area of the third flow hole 212 is smaller, small opening and small flow of the refrigerant can be realized through the third flow hole 212, and with the continuous movement of the valve core 20, large opening and large flow of the refrigerant can be realized through the first flow hole 211 and the third flow hole 212.

[0058] Here, the third flow hole 212 can be arranged separately, or can be formed on the inner wall of the side of the first flow hole 211 close to the second passage 22, so as to reduce the processing difficulty.

[0059] In another embodiment, as shown in Figure 6 and Figure 7 , the fluid passage further comprises a fourth flow hole 222 formed on the side wall of the valve core 20, the fourth flow hole 222 is in communication with the second passage 22, and at least part of the fourth flow hole 222 is arranged close to the first passage 21 relative to the second flow hole 221, wherein the flow area of the fourth flow hole 222 is smaller than that of the second flow hole 221. In this way, as shown in Figure 8 and Figure 9 , during the movement of the valve core 20 towards the second state corresponding position, the communication between the first valve cavity 111 and the second passage 22 can be realized through the fourth flow hole 222 first, and since the flow area of the fourth flow hole 222 is smaller, small opening and small flow of the refrigerant can be realized through the fourth flow hole 222, and with the continuous movement of the valve core 20, large opening and large flow of the refrigerant can be realized through the second flow hole 221 and the fourth flow hole 222.

[0060] Here, the fourth flow hole 222 can be arranged separately, or can be formed on the inner wall of the side of the second flow hole 221 close to the first passage 21, so as to reduce the processing difficulty.

[0061] In summary, the arrangement of the third flow hole 212 and the fourth flow hole 222 can meet the various flow path designs of the valve core 20, and is conducive to controlling the movement of the valve core 20 according to actual needs to meet the flow requirements of small flow or large flow.

[0062] It should be noted that, in order to ensure the sealing, the first sealing groove 23 is arranged close to the second passage 22 relative to the third flow-through hole 212, and the second sealing groove 24 is arranged close to the first passage 21 relative to the fourth flow-through hole 222, so as to ensure that the sealing positions of the corresponding valve ports are closer to the first valve cavity 111 when the valve ports are cut off.

[0063] In an embodiment, as shown in Figure 4 and Figure 6 , the first flow-through hole 211 and / or the second flow-through hole 221 are configured as circular holes. In another embodiment, as shown in Figure 7 , the first flow-through hole 211 and / or the second flow-through hole 221 can also be configured as rectangular holes. Both the circular holes and the rectangular holes are convenient to process and can reduce the processing difficulty.

[0064] When the first flow-through hole 211 is configured as a rectangular hole, a plurality of third flow-through holes 212 can be arranged on the inner wall of one rectangular hole close to the second passage 22. If the first flow-through hole 211 is a circular hole, one third flow-through hole 212 is preferably arranged on the inner wall of one circular hole close to the second passage 22. Similarly, when the second flow-through hole 221 is configured as a rectangular hole, a plurality of fourth flow-through holes 222 can be arranged on the inner wall of one rectangular hole close to the first passage 21. If the second flow-through hole 221 is a circular hole, one fourth flow-through hole 222 is preferably arranged on the inner wall of one circular hole close to the first passage 21. In this way, the processing is convenient, and the reliability of the small hole throttling can be ensured.

[0065] Specifically, in the embodiment, the number of the first flow-through holes 211 is configured as a plurality, and the plurality of first flow-through holes 211 are arranged in a circumferential direction of the valve core 20. The number of the second flow-through holes 221 is configured as a plurality, and the plurality of first flow-through holes 211 are arranged in a circumferential direction of the valve core 20. In this way, the flow performance of the refrigerant is ensured, and the flow resistance is avoided to be increased.

[0066] In an embodiment, as shown in Figures 1-3 , during the movement of the valve core 20, the first valve port 121 and the second valve port 131 are at least partially in contact with and slidingly fitted with the valve core 20. That is, the valve core 20 always maintains the contact and fitting with the first valve port 121 and the second valve port 131, so that the reliable guidance under the high pressure impact of the refrigerant can be ensured through the inner wall of the first valve port 121 and the second valve port 131, thereby improving the movement stability of the valve core 20.

[0067] Optionally, in the axial direction of the second valve port 131, one end of the second valve port 131 close to the first valve port 121 is higher than the center axis of the first interface 113, so as to further reduce the direct impact of the refrigerant on the valve core 20.

[0068] In an embodiment, the distance from the position of the third state to the position of the second state of the valve core 20 is the upstroke of the valve core 20, and the distance from the position of the third state to the position of the first state of the valve core 20 is the downstroke of the valve core 20. Wherein, the size of the upstroke is equal to the size of the downstroke, thus, it is beneficial to reduce the design difficulty of the stroke of the valve core 20, and the valve core 20 is preferably arranged in a symmetrical structure to further reduce the design difficulty.

[0069] As shown in the drawings, the second valve port 131 is formed with a lower limit portion 1312 protruding from the inner wall of the second valve port 131 towards the axis direction, and when the valve core 20 moves to the limit towards the third valve cavity 115, the one end of the valve core 20 in the axial direction abuts against the lower limit portion 1312. Wherein, when the valve core 20 abuts against the lower limit portion 1312, the three-way valve 100 is in the first state. That is, the lower limit portion 1312 limits the downstroke of the valve core 20, thereby improving the reliability of the movement of the valve core 20. Figure 1 Specifically, the lower limit portion 1312 is a step structure formed on the inner wall of the second valve port 131.

[0070] In an embodiment, as shown in the drawings, the three-way valve 100 further comprises a core shaft assembly 30 movably mounted in the valve body assembly 10, and one end of the core shaft assembly 30 is connected with the valve core 20 for driving the movement of the valve core 20 in the axial direction. The core shaft assembly 30 comprises a guide portion 31, and the valve body assembly 10 is further provided with an assembly hole 151 which is arranged in the space between the first valve port 121 and the second valve cavity 112 and is in communication with the second valve cavity 112, and the inner wall of the assembly hole 151 is in sliding cooperation with the outer wall of the guide portion 31. That is, the guide portion 31 can be guided by the assembly hole 151, thereby further improving the coaxiality of the valve core 20 during movement.

[0071] Figure 10 Further, the inner wall of the assembly hole 151 away from the second valve cavity 112 is formed with an upper limit portion 141 protruding towards the axis direction, and when the valve core 20 moves to the limit away from the second valve port 131, the one end of the guide portion 31 in the axial direction abuts against the upper limit portion 141. Wherein, when the guide portion 31 abuts against the upper limit portion 141, the three-way valve 100 is in the second state. That is, the upper limit portion 141 limits the upstroke of the valve core 20, thereby improving the reliability of the movement of the valve core 20.

[0072] Specifically, the upper limit portion 141 is a step structure formed on the inner wall of the assembly hole 151, and can be arranged on the valve seat 14 as described below.

[0073] Specifically, the upper limit portion 141 is a step structure formed on the inner wall of the assembly hole 151, and can be arranged on the valve seat 14 as described below.

[0074] ​In an embodiment, the inner diameter of the first valve port 121, the inner diameter of the second valve port 131 and the inner diameter of the assembly hole 151 are equal. In this way, the pressure balance of the valve core 20 during movement can be ensured, the adverse effects of the valve core 20 due to pressure difference are reduced, and the effectiveness and reliability of the valve core 20 during movement are ensured.

[0075] In an embodiment, as shown in Figure 10 , the spindle assembly 30 further comprises a screw rod 32 and a valve head 33, one end of the guide part 31 is movably connected with the screw rod 32, and the other end is limitingly connected with the valve head 33. Among them, the three-way valve 100 further comprises a nut sleeve 40, the screw rod 32 is arranged in the nut sleeve 40 and is threadedly connected with the nut sleeve 40, so as to convert the circumferential rotation of the screw rod 32 into the axial movement of the spindle assembly 30, and the end of the valve head 33 away from the screw rod 32 is connected with the valve core 20, so as to drive the valve core 20 to move axially.

[0076] Specifically, as shown in Figure 5 , the valve core 20 comprises a main body part 25 and a partition plate 26, the partition plate 26 is arranged in the main body part 25 and is connected with the main body part 25, and the partition plate 26 divides the inside of the main body part 25 into the first passage 21 and the second passage 22. Among them, the partition plate 26 is provided with a connecting hole 261, and the end of the valve head 33 away from the screw rod 32 is inserted into the connecting hole 261 and is fixedly connected with the partition plate 26. In this way, the structure of the valve core 20 is simple, easy to process, and convenient for the connection between the valve core 20 and the spindle assembly 30.

[0077] In order to ensure the reliability of the connection between the valve core 20 and the valve head 33, and to avoid internal leakage of the first passage 21 and the second passage 22 from the connecting hole 261, the valve head 33 can be fixed by welding after being installed into the connecting hole 261, so as to ensure the sealing performance.

[0078] Further, the spindle assembly 30 further comprises a bearing 34, the guide part 31 is provided with a mounting hole 311, and the bearing 34 is mounted in the mounting hole 311 and can rotate relative to the guide part 31. Among them, the screw rod 32 penetrates the guide part 31 and is connected to the inner ring of the bearing 34, and the bottom wall of the mounting hole 311 and the valve head 33 are respectively stopped at both ends of the outer ring of the bearing 34 along the axial direction. In this way, the reliability of the installation of the bearing 34 can be ensured, and at the same time, the setting of the bearing 34 can avoid the rotation of the valve head 33 and the valve core 20 with the rotation of the screw rod 32, so as to prevent the rotation friction between the valve core 20 and the first valve port 121 and the second valve port 131, and greatly prolong the service life.

[0079] In an embodiment, as shown in Figure 1 , Figure 11 and Figure 12As shown, the valve body assembly 10 comprises a main valve body 11, a valve port 12 and an end cover 13, the valve port 12 is installed in the main valve body 11 and separates the main valve body 11 into a first valve cavity 111 and a second valve cavity 112, and the end cover 13 is connected to one end of the main valve body 11 provided with the first valve cavity 111. Among them, the first valve port 121 is opened in the valve port 12, and the second valve port 131, the third valve cavity 115 and the second interface 132 are all opened in the end cover 13. In this way, the machining of the first valve port 121 and the second valve port 131 can be carried out respectively first, and then assembled and formed, which is beneficial to improve the machining precision and reduce the machining difficulty.

[0080] Further, in an embodiment, as shown in Figure 13 and Figure 14 As shown, the valve body assembly 10 further comprises a valve seat 14 and a guide sleeve 15, the valve seat 14 is connected to one end of the main valve body 11 provided with the second valve cavity 112, and the guide sleeve 15 is arranged in the second valve cavity 112, and one end of the guide sleeve 15 is inserted and connected to the valve seat 14. In this way, it is convenient to play a guiding role on the mandrel assembly 30.

[0081] Specifically, the guide sleeve 15 surrounds the above-mentioned assembly hole 151 after being connected with the valve seat 14. And along the axial direction of the guide sleeve 15, the end of the guide sleeve 15 away from the valve seat 14 is not higher than the inner wall of the side of the third connecting pipe 70 close to the valve seat 14, so as to further reduce the impact of high-pressure refrigerant on the mandrel assembly 30 and improve the coaxiality of the mandrel assembly 30 and the valve core 20 during movement.

[0082] The three-way valve 100 provided by the present application can be assembled by first assembling and welding the main valve body 11, the valve port 12, the first connecting pipe 50, the third connecting pipe 70 and the corresponding copper sleeve to form a first assembly, assembling and welding the end cover 13, the second connecting pipe 60 and the corresponding copper sleeve to form a second assembly, assembling and welding the valve seat 14 and the guide sleeve 15 to form a third assembly, and assembling and welding the mandrel assembly 30 and the valve core 20 to form a fourth assembly. Then, the mandrel assembly 30 of the fourth assembly is slidably fitted into the valve seat 14 and the guide sleeve 15 of the third assembly, the valve seat 14 is press-fitted into the main valve body 11 of the first assembly and welded, and the end cover 13 of the second assembly is press-fitted into the main valve body 11 of the first assembly and welded. At this time, the valve core 20 is inserted into the first valve port 121 and the second valve port 131 and forms a sliding fit with the first valve port 121 and the second valve port 131, and finally the rotor and other parts are assembled, thereby forming the three-way valve 100.

[0083] The technical features of the above-mentioned embodiments can be combined arbitrarily, in order to make the description simple, not all possible combinations of the technical features in the above-mentioned embodiments are described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0084] The above-described embodiments are merely illustrative of several embodiments of the present application, which are described in more detail and in a more specific manner, but should not be construed as limiting the scope of the patent application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A three-way valve characterized by, The valve body assembly (10) is provided with a first valve cavity (111), a second valve cavity (112), a third valve cavity (115), a first valve port (121) and a second valve port (131), the first valve cavity (111) is located between the second valve cavity (112) and the third valve cavity (115), the two ends of the first valve port (121) are communicated with the first valve cavity (111) and the second valve cavity (112) respectively, the two ends of the second valve port (131) are communicated with the first valve cavity (111) and the third valve cavity (115) respectively, the first valve cavity (111), the second valve cavity (112) and the third valve cavity (115) are connected with connecting pipes respectively; The valve core (20) is movably installed in the valve body assembly (10) and is in sliding fit with the first valve port (121) and the second valve port (131), and a fluid passage is formed in the valve core (20); The three-way valve has a first state, a second state and a third state with the sliding of the valve core (20); When the three-way valve is in the first state, the first valve cavity (111) and the second valve cavity (112) are communicated through the fluid passage, and the first valve cavity (111) and the second valve cavity (112) are disconnected with the third valve cavity (115); When the three-way valve is in the second state, the first valve cavity (111) and the third valve cavity (115) are communicated through the fluid passage, and the first valve cavity (111) and the third valve cavity (115) are disconnected with the second valve cavity (112); When the three-way valve is in the third state, the first valve cavity (111), the second valve cavity (112) and the third valve cavity (115) are disconnected.

2. The tee valve of claim 1, wherein The fluid passage comprises a first passage (21), a second passage (22), a first flow-through hole (211) and a second flow-through hole (221), the first passage (21) is communicated with the second valve cavity (112), and the first flow-through hole (211) is communicated with the side wall of the first passage (21), the second passage (22) is communicated with the third valve cavity (115), and the second flow-through hole (221) is communicated with the side wall of the second passage (22); When the three-way valve is in the first state, the first flow-through hole (211) is communicated with the first valve cavity (111), and the inner wall of the second valve port (131) disconnects the communication between the second flow-through hole (221) and the first valve cavity (111); When the three-way valve is in the second state, the second flow-through hole (221) is communicated with the first valve cavity (111), and the inner wall of the first valve port (121) disconnects the communication between the first flow-through hole (211) and the first valve cavity (111); When the three-way valve is in the third state, the inner wall of the first valve port (121) blocks the first flow-through hole (211), and the inner wall of the second valve port (131) blocks the second flow-through hole (221).

3. The three-way valve according to claim 2, characterized in that The fluid passage further comprises a third flow hole (212) formed on the side wall of the valve core (20), the third flow hole (212) communicates with the first passage (21), and at least part of the third flow hole (212) is arranged close to the second passage (22) relative to the first flow hole (211); wherein the flow area of the third flow hole (212) is smaller than the flow area of the first flow hole (211). And / or, the fluid passage further comprises a fourth flow hole (222) formed on the side wall of the valve core (20), the fourth flow hole (222) communicates with the second passage (22), and at least part of the fourth flow hole (222) is arranged close to the first passage (21) relative to the second flow hole (221); wherein the flow area of the fourth flow hole (222) is smaller than the flow area of the second flow hole (221).

4. The tee valve of claim 3, wherein The third flow hole (212) is formed on the inner wall of the side of the first flow hole (211) close to the second passage (22); And / or, the fourth flow hole (222) is formed on the inner wall of the side of the second flow hole (221) close to the first passage (21).

5. The three-way valve according to any one of claims 2 to 4, characterized in that The outer side wall of the valve core (20) is recessed in the direction close to its own axis to form a first sealing groove (23), the first sealing groove (23) is arranged close to the second passage (22) relative to the first flow hole (211), and a first sealing element (231) is installed in the first sealing groove (23), when the three-way valve is in the second state and the third state, the first sealing element (231) is in sealing cooperation with the inner wall of the first valve port (121); And / or, the outer side wall of the valve core (20) is recessed in the direction close to its own axis to form a second sealing groove (24), the second sealing groove (24) is arranged close to the first passage (21) relative to the second flow hole (221), and a second sealing element (241) is installed in the second sealing groove (24), when the three-way valve is in the first state and the third state, the second sealing element (241) is in sealing cooperation with the inner wall of the second valve port (131).

6. The tee valve of claim 5, wherein The first valve port (121) is provided with a first guide surface (1211) close to one end of the first valve cavity (111), along the axial direction of the first valve port (121), and from the first valve cavity (111) to the first valve port (121), the inner diameter of the first guide surface (1211) has a gradually decreasing trend; And / or, the second valve port (131) is provided with a second guide surface (1311) close to one end of the first valve cavity (111), along the axial direction of the second valve port (131), and from the first valve cavity (111) to the second valve port (131), the inner diameter of the second guide surface (1311) has a gradually decreasing trend.

7. The tee valve of claim 1, wherein The distance from the position of the third state to the position of the second state of the valve core (20) is the upstroke of the valve core (20), and the distance from the position of the third state to the position of the first state of the valve core (20) is the downstroke of the valve core (20); Wherein, the size of the upstroke is equal to the size of the downstroke.

8. The tee valve of claim 1, wherein During the movement of the valve core (20), the first valve port (121) and the second valve port (131) are at least partially in contact with and slidingly fitted with the valve core (20).

9. The tee valve of claim 1, wherein The inner wall of the second valve port (131) near one end of the third valve cavity (115) protrudes in the direction close to the axis to form a lower limit portion (1312), when the valve core (20) moves to the limit in the direction close to the third valve cavity (115), the one end of the valve core (20) in the axial direction abuts against the lower limit portion (1312); Wherein, when the valve core (20) abuts against the lower limit portion (1312), the three-way valve is in the first state.

10. The tee valve of claim 1, wherein The three-way valve further comprises a core shaft assembly (30) movably mounted in the valve body assembly (10), and one end of the core shaft assembly (30) is connected with the valve core (20) for driving the movement of the valve core (20) in the axial direction, and the core shaft assembly (30) comprises a guide portion (31); The valve body assembly (10) further comprises an assembly hole (151) spaced apart from the first valve port (121) and communicating with the second valve cavity (112), and the inner wall of the assembly hole (151) slidingly fits with the outer wall of the guide portion (31).

11. The three-way valve according to claim 10, characterized in that The inner diameter of the first valve port (121), the inner diameter of the second valve port (131) and the inner diameter of the assembly hole (151) are equal.

12. The tee valve of claim 10, wherein The inner wall of the assembly hole (151) away from one end of the second valve cavity (112) protrudes in the direction close to the axis to form an upper limit portion (141), when the valve core (20) moves to the limit in the direction away from the second valve port (131), the one end of the guide portion (31) in the axial direction abuts against the upper limit portion (141); Wherein, when the guide portion (31) abuts against the upper limit portion (141), the three-way valve is in the second state.

13. The three-way valve of claim 10, wherein The core shaft assembly (30) further comprises a screw rod (32) and a valve head (33), one end of the guide portion (31) movably connects with the screw rod (32), and the other end limitingly connects with the valve head (33); Wherein, the end of the valve head (33) away from the screw rod (32) is connected with the valve core (20).

14. The three-way valve according to claim 13, characterized in that The valve core (20) comprises a main body portion (25) and a partition plate (26), the partition plate (26) is arranged in the main body portion (25) and connected with the main body portion (25); Wherein, the partition plate (26) is provided with a connecting hole (261), and the end of the valve head (33) away from the screw rod (32) is inserted into the connecting hole (261) and fixedly connected with the partition plate (26).

15. The tee valve of claim 1, wherein The valve body assembly (10) comprises a main valve body (11), a valve port part (12) and an end cover (13), the valve port part (12) is installed in the main valve body (11) and separates the inside of the main valve body (11) into the first valve cavity (111) and the second valve cavity (112), and the end cover (13) is connected to one end of the main valve body (11) provided with the first valve cavity (111); Wherein, the first valve port (121) is arranged in the valve port part (12), and the second valve port (131) and the third valve cavity (115) are arranged in the end cover (13).

16. The three-way valve of claim 15, wherein The valve body assembly (10) further comprises a valve seat (14) and a guide sleeve (15), the valve seat (14) is connected to one end of the main valve body (11) provided with the second valve cavity (112), the guide sleeve (15) is arranged in the second valve cavity (112), and one end of the guide sleeve (15) is inserted into and connected to the valve seat (14).

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