A four-way reversing valve

Abstract

The utility model discloses a four -way reversing valve, and valve body includes first interface and first inner wall surface, and first interface introduces fluid, and the valve element includes first outer wall surface, and first outer wall surface is towards first inner wall surface, and first outer wall surface includes first inlet, second inlet and intermediate area, and the four -way reversing valve includes intermediate working position, and when the valve element is located in intermediate working position, and intermediate area is at least partially opposite with first interface position, and the intermediate area includes intermediate clearance flow channel with first inner wall surface, and first inlet includes first clearance flow channel with first inner wall surface, and second inlet includes second clearance flow channel with first inner wall surface, define the flow area of intermediate clearance flow channel as M, define the flow area of first clearance flow channel as M1, define the flow area of second clearance flow channel as M2, then have M1=M2, M1M, and the fluid in clearance flow channel throttles, prevents fluid to cause the hindrance to the valve element movement.

Description

Technical Field

[0001] This utility model relates to the field of fluid control technology, specifically to a four-way reversing valve that can be used for flow path switching in the control system of air conditioning, heat pump and other systems. Background Technology

[0002] Figure 1 The diagram shown is a structural schematic of a four-way directional valve in the background art. Figure 2 for Figure 1 A cross-sectional schematic diagram of a four-way directional valve. Figure 3 As shown Figure 1 The diagram shows a three-dimensional structure of the valve core in the directional control valve. Figure 4 As shown Figure 3 The top view of the valve core shown.

[0003] As shown in the figure above, the reversing valve 100 is connected to the pilot valve assembly. The reversing valve 100 includes a valve body assembly 03 and a valve core assembly. The valve core assembly includes a valve core 01, a first piston 021, and a second piston 022. The valve core includes four flow channels. The reversing valve generates thrust through the pressure difference formed on both sides of the valve core assembly, causing the valve core assembly to displace and achieve reversal, thereby changing the communication relationship between the four flow channels of the valve core and the four ports 011, 012, 013, and 014 on the valve body assembly 03. The inner wall of the valve body assembly 03 has a square cross-section. The first port 011 on the valve body is used to communicate with the exhaust port of the compressor in the refrigeration system. Figure 3 As shown, the valve core 01 in the background art is rectangular. The orientation of the valve core 01 is defined as the end face of the first interface 011 as the first outer wall surface 0111, and the surface of the valve body component 03 opposite to the first outer wall surface 0111 is defined as the first inner wall surface 0311. Figure 3 and Figure 4 As shown, a first recess 0113 and a second recess 0114 are provided on the valve core 01, and the first recess 0113 and the second recess 0114 are disposed opposite to the first inner wall surface 0311. In the direction perpendicular to the moving direction of the valve core 01, i.e. Figure 2 In the X direction, the valve core 01 includes an intermediate region 0110 located between the first recess 0113 and the second recess 0114. The distance between the intermediate region 0110 and the first inner wall surface 0311 of the valve body component 03 is less than the distance between the first recess 0113 and the first inner wall surface 0311. The first recess 0113 and the second recess 0114 have the same structure and size.

[0004] Valve core 01 in Figure 2During the sliding motion to the right at the indicated position, i.e., during the switching of valve core 01, the high-pressure fluid in the compressor enters the reversing valve through the first interface 011. The fluid then flows to both sides of valve core 01. A first gap X1 is formed between the first recess 0113 and the second recess 0114 of valve core 01 and the first inner wall surface 0311. A second gap X2 is formed between the middle region 0110 of valve core 01 and the first inner wall surface 0311. The flow area of ​​the first gap X1 is larger than the flow area of ​​the second gap X2. A larger flow area results in a larger fluid flow rate (faster pressure rise per unit time). Therefore, the fluid flowing out from the first gap X1... The flow channel B1 forms a high-pressure chamber. The high-pressure fluid in the flow channel B1 continuously flows into the space E1 between the valve core 01 and the second piston 022, causing the pressure in the right cavity space E of the valve core 01 to continuously increase. Meanwhile, the fluid flowing out from the second gap X2 forms a low-pressure chamber in the flow channel A1 of the valve core 01. The fluid in the space C1 between the valve core 01 and the first piston 021 continuously flows into the flow channel A1, causing the pressure in the space C1 on the left side of the valve core 01 to continuously decrease. This results in a large pressure difference between the two sides of the valve core 01, and the direction of the pressure difference is opposite to the direction of valve core movement, forming resistance and hindering the movement of the valve core 01, thus affecting the switching reliability of the directional valve. Utility Model Content

[0005] The purpose of this application is to provide a four-way directional valve, including a valve body assembly and a valve core assembly. The valve core assembly is located in the inner cavity of the valve body assembly and can reciprocate along the axial direction of the valve body assembly. The valve core assembly includes a valve core, a first piston, and a second piston. The first piston and the second piston are respectively located on both sides of the valve core, and the first piston and the second piston are in sliding fit with the inner wall of the valve body assembly. The inner cavity includes a first cavity and a second cavity. The first cavity is located between the valve core and the first piston, and the second cavity is located between the valve core and the second piston.

[0006] The valve body assembly includes a valve body and a valve core located inside the valve body. The valve body and valve core have square cross-sections. The valve body includes a first interface and a first inner wall surface. The first interface is located on the first inner wall surface and introduces fluid through the first interface. The valve core includes a first flow channel and a second flow channel. The first flow channel includes a first inlet and the second flow channel includes a second inlet. The valve core includes a first outer wall surface facing the first inner wall surface. The first outer wall surface includes a first inlet, a second inlet, and an intermediate region located between the first inlet and the second inlet.

[0007] The four-way reversing valve includes an intermediate working position. When the valve core is in the intermediate working position, the intermediate area is at least partially opposite to the first interface position. An intermediate gap flow channel is included between the intermediate area and the first inner wall surface. A first gap flow channel is included between the first inlet and the first inner wall surface. A second gap flow channel is included between the second inlet and the first inner wall surface. The first gap flow channel connects the intermediate gap flow channel and the first cavity. The second gap flow channel connects the intermediate gap flow channel and the second cavity.

[0008] Let M be the flow area of ​​the intermediate gap channel; let M1 be the flow area of ​​the first gap channel; let M2 be the flow area of ​​the second gap channel. Then M1 = M2 and M1 < M.

[0009] In this application, the flow area of ​​the first gap flow channel and the second gap flow channel is smaller than that of the middle gap flow channel. This throttles the fluid in the gap flow channel and prevents a large amount of high-pressure fluid from entering the valve body cavity in the reversing direction during the valve core reversal process, thus hindering the movement of the valve core.

[0010] On the other hand, this application provides a four-way reversing valve, including a valve body assembly and a valve core assembly. The valve core assembly is located in the inner cavity of the valve body assembly and can reciprocate along the axial direction of the valve body assembly. The valve core assembly includes a valve core, a first piston, and a second piston. The first piston and the second piston are respectively located on both sides of the valve core, and the first piston and the second piston are in sliding fit with the inner wall of the valve body assembly. The inner cavity includes a first cavity and a second cavity. The first cavity is located between the valve core and the first piston, and the second cavity is located between the valve core and the second piston.

[0011] The valve body assembly includes a valve body and a valve core located inside the valve body. The valve body and valve core have square cross-sections. The valve body includes a first interface and a first inner wall surface. The first interface is located on the first inner wall surface and introduces fluid through the first interface. The valve core includes a first flow channel and a second flow channel. The first flow channel includes a first inlet and the second flow channel includes a second inlet. The valve core includes a first outer wall surface facing the first inner wall surface. The first outer wall surface includes a first inlet, a second inlet, and an intermediate region located between the first inlet and the second inlet.

[0012] The four-way reversing valve includes an intermediate working position. When the valve core is in the intermediate working position, the intermediate area is at least partially opposite to the first interface position. An intermediate gap flow channel is included between the intermediate area and the first inner wall surface. A first gap flow channel is included between the first inlet and the first inner wall surface. A second gap flow channel is included between the second inlet and the first inner wall surface. The first gap flow channel connects the intermediate gap flow channel and the first cavity. The second gap flow channel connects the intermediate gap flow channel and the second cavity.

[0013] Let M be the flow area of ​​the intermediate gap channel; let M1 be the flow area of ​​the first gap channel; let M2 be the flow area of ​​the second gap channel, then M1 = M2 = M.

[0014] The valve body includes a second port that can lead out low-pressure fluid; the valve body also includes a second inner wall surface that is opposite to the first inner wall surface, and the second port is located on the second inner wall surface; the flow area of ​​the second port is defined as N, then 0.05≤M / N≤0.15.

[0015] In the four-way directional valve of this application, the flow area of ​​the gap between the valve core and the fluid interface remains unchanged, and the ratio of the flow area of ​​the intermediate gap flow channel to the flow area of ​​the second interface is controlled between 0.05 and 0.15 to ensure smooth valve core movement and prevent a large amount of high-pressure fluid from entering the valve body cavity in the reversing direction during the valve core reversing process, thus avoiding obstruction to the valve core movement. Attached Figure Description

[0016] In the accompanying drawings, shapes and dimensions may be enlarged for clarity, and the same reference numerals will be used in all figures to indicate the same or similar parts.

[0017] Figure 1 The diagram shown is a three-dimensional structural schematic of a four-way directional valve in the background art.

[0018] Figure 2 As shown Figure 1 A cross-sectional view of the four-way directional valve shown;

[0019] Figure 3 As shown Figure 2 A three-dimensional structural diagram of the valve core inside a four-way directional valve;

[0020] Figure 4 As shown Figure 2 Top view of the valve core;

[0021] Figure 5 The figure shown is a three-dimensional structural diagram of the four-way directional valve in this application;

[0022] Figure 6 The figure shown is a partial cross-sectional view of the four-way directional valve in this application;

[0023] Figure 7 As shown Figure 6 A magnified view of a portion of position A in the middle;

[0024] Figure 8 The figure shown is a cross-sectional view of the four-way directional valve in its first working position in one embodiment.

[0025] Figure 9 The figure shown is a cross-sectional view of the four-way directional valve in the middle working position in one embodiment.

[0026] Figure 10 The figure shown is a three-dimensional structural diagram of the valve core in one embodiment;

[0027] Figure 11 The diagram shown is a flow path schematic of a four-way reversing valve in its first working position in one embodiment.

[0028] Figure 12 The diagram shown is another cross-sectional view of the four-way directional valve in the middle working position in one embodiment.

[0029] Figure 13 The diagram shown is a flow path schematic of the four-way reversing valve in the second working position state in one embodiment;

[0030] Figure 14 The diagram shown is a schematic diagram of the first gap flow channel in one embodiment of this application;

[0031] Figure 15 The diagram shown is a schematic diagram of the first gap flow channel in another embodiment of this application;

[0032] Figure 16 The diagram shown is a schematic diagram of the first gap flow channel in another embodiment of this application;

[0033] Figure 17 The diagram shown is a schematic diagram of the first gap flow channel in another embodiment of this application;

[0034] Figure 18 The figure shown is a cross-sectional view of the four-way directional valve in its first working position according to another embodiment of this application;

[0035] Figure 19 The figure shown is a cross-sectional view of the four-way directional valve in the middle working position in another embodiment of this application;

[0036] Figure 20 The figure shown is a three-dimensional structural diagram of the valve core in another embodiment of this application;

[0037] Figure 21 The figure shown is a cross-sectional view of the four-way directional valve in the middle working position in one embodiment of this application.

[0038] In the attached diagram:

[0039] 100. Reversing valve; 01. Valve core; 0113. First recess; 0114. Second recess; 0110. Intermediate region; 021. First piston; 022. Second piston; 03. Valve body component; 011. First interface; 012. Second interface; 013. Third interface; 014. Fourth interface; 0111. First outer wall surface; 0311. First inner wall surface;

[0040] 1. Reversing valve;

[0041] 10. Valve body assembly; 101. Inner cavity; 1011. First cavity; 1012. Second cavity; 1013. First reversing cavity; 1014. Second reversing cavity; 1020. Intermediate gap flow channel; 1021. First gap flow channel; 1022. Second gap flow channel;

[0042] 11. Valve body; 1101. First inner wall surface; 1102. Second inner wall surface; 1103. Third inner wall surface; 1104. Fourth inner wall surface;

[0043] 1110, First Interface; 1120, Second Interface; 1130, Third Interface; 1140, Fourth Interface;

[0044] 111. First takeover; 112. Second takeover; 113. Third takeover; 114. Fourth takeover;

[0045] 12. First end cap; 13. Second end cap; 102. Cylindrical portion;

[0046] 20. Valve core assembly; 21. Valve core; 210. First outer wall surface; 2101. First inlet section; 2102. Second inlet section; 2100. Intermediate region; 211. First flow channel; 2111. First inlet; 2112. First outlet;

[0047] 212, Second flow channel; 2121, Second inlet; 2122, Second outlet;

[0048] 213. Third flow channel; 2131. Third inlet; 2132. Third outlet;

[0049] 214. Fourth flow channel; 2141. Fourth inlet; 2142. Fourth outlet;

[0050] 22. First piston; 23. Second piston;

[0051] 30. Sealing ring;

[0052] 2. Pilot valve;

[0053] 200. Pilot valve chamber; 201. Pilot valve slider; 2010. Slider channel; 202. Pilot valve piston; 203. High-pressure pipeline; 204. Low-pressure pipeline;

[0054] 205. First switching pipeline; 206. Second switching pipeline;

[0055] 3. Driver. Detailed Implementation

[0056] The embodiments of this utility model application will now be described in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them.

[0057] like Figures 5 to 21As shown, the four-way directional valve of this application includes a directional valve 1, a pilot valve 2, and an actuator 3. The actuator 3 drives the pilot valve 2 to control the directional valve 1 to switch. The directional valve 1 includes a valve body assembly 10, a valve core assembly 20, and a sealing ring 30. The valve core assembly 20 is located in the inner cavity 101 of the valve body assembly 10 and can reciprocate along the axial direction of the valve body assembly 10. The valve core assembly 20 includes a valve core 21, a first piston 22, and a second piston 23. The first piston 22 and the second piston 23 are located on both sides of the valve core 21, and the first piston 22 and the second piston 23 slide in contact with the inner wall of the valve body assembly 10. The inner cavity 101 includes a first cavity 1011 and a second cavity 1012. The first cavity 1011 is located between the valve core 21 and the first piston 22, and the second cavity 1012 is located between the valve core 21 and the second piston 23.

[0058] like Figure 8 , Figure 9 , Figure 18 , Figure 19 As shown, the valve body assembly 10 includes a valve body 11, a first end cap 12, and a second end cap 13. The first end cap 12 and the second end cap 13 are respectively connected to both ends of the valve body 11. The valve core 21 is located inside the valve body 11. The valve body 11 and the valve core 21 have square cross-sections. The valve body 11 includes a first port 1110 and a first inner wall surface 1101. The first port 1110 is located on the first inner wall surface 1101. When the four-way reversing valve is applied in the system, the first port 1110 is connected to the high-pressure side of the compressor and is used to introduce fluid.

[0059] Both the first end cap 12 and the second end cap 13 include a cylindrical portion 102. A first piston 22 is located inside the first end cap 12 and slides in cooperation with the cylindrical portion 102. A second piston 23 is located inside the second end cap 13 and slides in cooperation with the cylindrical portion 102. The inner cavity 101 includes a reversing cavity, which includes a first reversing cavity 1013 and a second reversing cavity 1014. The first reversing cavity 1013 is located inside the first end cap 12, and the second reversing cavity 1014 is located inside the second end cap 13. The first reversing cavity 1013 is separated from the first cavity 1011 by the first piston 22, and the second reversing cavity 1014 is separated from the second cavity 1012 by the second piston 23.

[0060] like Figure 5 , Figure 6 , Figure 7As shown, the pilot valve 2 includes a pilot valve chamber 200, a pilot valve slider 201, a pilot valve piston 202, a first switching pipeline 205, a second switching pipeline 206, a high-pressure pipeline 203, and a low-pressure pipeline 204. The high-pressure pipeline 203 is connected to the pilot valve chamber 200, and the first switching pipeline 205, the low-pressure pipeline 204, and the second switching pipeline 206 are located on opposite sides of the high-pressure pipeline 203. A first connecting pipe 111 is connected to the first port 1110 of the reversing valve 1, and the other side of the high-pressure pipeline 203 is connected to the first connecting pipe 111. The first switching pipeline 205 is connected to the first reversing chamber 1013, and the second switching pipeline 206 is connected to the second reversing chamber 1014.

[0061] The pilot valve slider 201 is located in the pilot valve chamber 200. The pilot valve slider 201 includes a slider channel 2010. The pilot valve slider 201 is connected to the pilot valve piston 202. The driver 3 drives the pilot valve piston 202 to move the pilot valve slider 201, so that the pilot valve chamber 200 switches between the first switching pipeline 205 and the second switching pipeline 206.

[0062] The directional valve 1 includes a first working position and a second working position. For example... Figure 8 , Figure 18 As shown, when the reversing valve 1 is in the first working position, the pilot valve chamber 200 is connected to the first reversing chamber 1013, and the slider channel 2010 is connected to the second switching pipeline 206 and the low-pressure pipeline 204. At this time, the pressure in the first reversing chamber 1013 increases, and the pressure in the second reversing chamber 1014 decreases. The first piston 22 drives the valve core 21 to move toward the second reversing chamber 1014. When the reversing valve 1 is in the second working position, the pilot valve chamber 200 is connected to the second reversing chamber 1014, and the slider channel 2010 is connected to the first switching pipeline 205 and the low-pressure pipeline 204. At this time, the pressure in the first reversing chamber 1013 decreases, and the pressure in the second reversing chamber 1014 increases. The second piston 23 drives the valve core 21 to move toward the first reversing chamber 1013.

[0063] Furthermore, the valve core 21 includes a first flow channel 211, a second flow channel 212, a third flow channel 213, and a fourth flow channel 214. The first flow channel 211 includes a first inlet 2111, the second flow channel 212 includes a second inlet 2121, and the valve core 21 includes a first outer wall surface 210 facing the first inner wall surface 1101. The first outer wall surface 210 includes the first inlet 2111, the second inlet 2121, and an intermediate region 2100, which is located between the first inlet 2111 and the second inlet 2121.

[0064] Reversing valve 1 includes intermediate operating positions, such as... Figure 9 , Figure 19As shown, when the valve core 21 is in the middle working position, the middle region 2100 is at least partially opposite to the position of the first interface 1110. The middle region 2100 and the first inner wall surface 1101 include a middle gap flow channel 1020. The first inlet 2111 and the first inner wall surface 1101 include a first gap flow channel 1021. The second inlet 2121 and the first inner wall surface 1101 include a second gap flow channel 1022. The first gap flow channel 1021 connects the middle gap flow channel 1020 and the first cavity 1011. The second gap flow channel 1022 connects the middle gap flow channel 1020 and the second cavity 1012.

[0065] In one embodiment, such as Figure 8 , Figure 9 , Figure 10 , Figure 12 As shown, the flow area of ​​the intermediate gap channel 1020 is defined as M; the flow area of ​​the first gap channel 1021 is defined as M1; and the flow area of ​​the second gap channel 1022 is defined as M2. Then, M1 = M2 and M1 < M.

[0066] The valve body 11 includes a second port 1120. When the directional valve is applied in the system, the second port 1120 is connected to the low-pressure side and can be used to draw out fluid. The valve body 11 includes a second inner wall surface 1102, which is opposite to the first inner wall surface 1101. The second port 1120 is located on the second inner wall surface 1102.

[0067] Through the above structural design, the gap flow area between the first outer wall surface 210 of the valve core 21 and the first inner wall surface 1101 of the valve body 11 in this application is larger at the middle region 2100 and smaller at the two sides. This causes the first gap flow channel 1021 and the second gap flow channel 1022 to be throttled when the valve core 21 moves to the middle working position. Most of the fluid from the first interface 1110 flows into the second interface 1120 through the middle gap flow channel 1020, the first flow channel 211 and the second flow channel 212. This prevents high-pressure fluid from entering the first cavity 1011 or the second cavity 1012, which would create a pressure difference between the first cavity 1011 and the second cavity 1012, causing the movement of the valve core 21 to be hindered by the fluid pressure difference between the first cavity 1011 and the second cavity 1012.

[0068] The intermediate gap flow channel 1020 can connect the first interface 1110 and the second interface 1120. The flow area of ​​the second interface 1120 is defined as N, then 0.05 < M / N ≤ 0.15. The ratio of the flow area of ​​the intermediate gap flow channel 1020 to the flow area of ​​the second interface 1120 should not be too high. If the ratio is high, the flow area of ​​the intermediate gap flow channel 1020 will be large. When the reversing valve 1 is in the intermediate reversing position, the high-pressure fluid in the first interface 1110 will leak through the intermediate gap flow channel 1020. As a result, the fluid pressure entering the pilot valve 2 through the high-pressure pipeline 203 will be insufficient, resulting in insufficient reversing force provided by the pilot valve 2 and reducing the movement performance of the valve core 21. Similarly, the ratio of the flow area of ​​the gap flow channel to the flow area of ​​the second interface 1120 should not be too low. If the ratio is low, the flow area of ​​the intermediate gap flow channel 1020 will be small. When the reversing valve 1 is in the intermediate reversing position, the high-pressure fluid in the first interface 1110 will have difficulty leaking through the intermediate gap flow channel 1020. As a result, the fluid pressure entering the pilot valve 2 through the high-pressure pipeline 203 will be too high, resulting in excessive reversing force provided by the pilot valve 2, which may cause the valve core 21 to collide during reversing.

[0069] Furthermore, the first gap flow channel 1021 connects the first cavity 1011 and the first inlet 2111, and the second gap flow channel 1022 connects the second cavity 1012 and the second inlet 2121, so M1 / N≥0.05. Provided that the flow area of ​​the intermediate gap flow channel 1020 meets the aforementioned conditions, the flow areas of the first gap flow channel 1021 and the second gap flow channel 1022 should not be too low.

[0070] Furthermore, such as Figure 11 , Figure 12 , Figure 13 As shown, the valve body 11 includes a third port 1130 and a fourth port 1140. The valve body 11 includes a third inner wall surface 1103 and a fourth inner wall surface 1104 disposed opposite to each other. The third port 1130 is located on the third inner wall surface 1103, and the fourth port 1140 is located on the fourth inner wall surface 1104. The third port 1130 and the fourth port 1140 are positioned opposite each other. A first connecting pipe 111 is connected to the first port 1110, a second connecting pipe 112 is connected to the second port 1120, a third connecting pipe 113 is connected to the third port 1130, and a fourth connecting pipe 114 is connected to the fourth port 1140.

[0071] The first flow channel 211 on the valve core 21 includes a first outlet 2112, the second flow channel 212 includes a second outlet 2122, the valve core 21 also includes a third flow channel 213 and a fourth flow channel 214, the third flow channel 213 includes a third inlet 2131 and a third outlet 2132, the fourth flow channel 214 includes a fourth inlet 2141 and a fourth outlet 2142, the third inlet 2131 is opposite to the first outlet 2112, and the fourth inlet 2141 is opposite to the second outlet 2122;

[0072] Specifically, such as Figure 11 , Figure 13 As shown, when the valve core 21 is in the first working position, the first port 1110 is connected to the first flow channel 211, the first outlet 2112 is connected to the third port 1130, and the third flow channel 213 is connected to the fourth port 1140 and the second port 1120. When the valve core 21 is in the second working position, the first port 1110 is connected to the second flow channel 212, the second outlet 2122 is connected to the third port 1130, and the fourth flow channel 214 is connected to the fourth port 1140 and the second port 1120. The reversing connection of the four-way reversing valve 1 is achieved through the above structural design. For example, when the four-way reversing valve 1 is connected to the air conditioning refrigeration system, the first port 1110 is connected to the compressor discharge side, the second port 1120 is connected to the compressor suction side, the third port 1130 is connected to the evaporator flow path, and the fourth port 1140 is connected to the condenser flow path. When the four-way reversing valve 1 is in the first working position, the first port 1110 is connected to the third port 1130 through the first flow channel 211, that is, the compressor discharge side is connected to the evaporator. After the high-pressure fluid passes through the evaporator-condenser flow path, it flows back to the reversing valve 1 from the fourth port 1140, and then enters the second port 1120 through the third flow channel 213, forming a cycle. When the four-way reversing valve 1 is in the second working position, the first port 1110 is connected to the fourth port 1140 through the second flow channel 212, that is, the compressor discharge side is connected to the condenser. After the high-pressure fluid passes through the condenser-evaporator flow path, it flows back to the reversing valve 1 from the third port 1130, and then enters the second port 1120 through the fourth flow channel 214, forming a cycle.

[0073] Furthermore, such as Figure 11 , Figure 13 As shown, the first flow channel 211 and the second flow channel 212 are straight flow channels, while the third flow channel 213 and the fourth flow channel 214 are curved flow channels. The flow areas of the first flow channel 211 and the second flow channel 212 are equal, and the flow areas of the third flow channel 213 and the fourth flow channel 214 are equal, with the flow area of ​​the third flow channel 213 being larger than that of the first flow channel 21. That is, the flow area of ​​the valve core 21 channel connecting to the low-pressure fluid side is larger than the flow area of ​​the valve core 21 channel connecting to the high-pressure fluid side, thus improving the flow performance of the valve core 21 channel.

[0074] The four-way directional valve 1 also includes multiple sealing rings 30, which are located at the first outlet 2112, the second outlet 2122, the third inlet 2131, the third outlet 2132, the fourth inlet 2141, and the fourth outlet 2142, respectively.

[0075] In one embodiment, such as Figure 14 , Figure 15 and combined Figure 3 and Figure 10As shown, the first outer wall surface 210 includes a first inlet section 2101 and a second inlet section 2102. The first inlet 2111 is located in the first inlet section 2101, and the second inlet 2121 is located in the second inlet section 2102. The first inlet section 2101 and the second inlet section 2102 are symmetrical about the intermediate region 2100. Along the width direction of the valve core 21, the first inlet section 2101 is planar or arc-shaped.

[0076] In one embodiment, such as Figure 16 , Figure 17 As shown, the first outer wall surface 210 includes a first inlet section 2101 and a second inlet section 2102. The first inlet 2111 is located in the first inlet section 2101, and the second inlet 2121 is located in the second inlet section 2102. The first inlet section 2101 and the second inlet section 2102 are symmetrical about the intermediate region 2100. Along the width direction of the valve core 21, the middle part of the first inlet section 2101 includes a groove or a protrusion.

[0077] In another embodiment, such as Figure 18 , Figure 19 , Figure 20 , Figure 21 As shown, the first outer wall surface 210 is a plane, the flow area of ​​the intermediate gap flow channel 1020 is defined as M; the flow area of ​​the first gap flow channel 1021 is defined as M1; the flow area of ​​the second gap flow channel 1022 is defined as M2, then M1=M2=M;

[0078] The valve body 11 includes a second port 1120, which can lead out low-pressure fluid; the valve body 11 includes a second inner wall surface 1102, which is opposite to the first inner wall surface 1101, and the second port 1120 is located on the second inner wall surface 1102; the flow area of ​​the second port 1120 is defined as N, then 0.05≤M / N≤0.15.

[0079] Through the above structural design, since the first outer wall surface 210 is a flat surface, the flow areas of the first gap flow channel 1021, the intermediate gap flow channel 1020, and the second gap flow channel 1022 are equal. The flat outer wall surface facilitates processing, and the flow area of ​​the gap flow channel remains unchanged during the reversing process, resulting in smooth reversing and improving the reliability of the reversing valve 1. Furthermore, the ratio of the flow area of ​​the gap flow channel to the flow area of ​​the second interface 1120 is controlled between 0.05 and 0.15, ensuring smooth movement of the valve core 21 and preventing poor reversing of the valve core 21 due to high-pressure fluid leakage or blockage.

[0080] Furthermore, the ratio of the flow area of ​​the gap channel to the flow area of ​​the second interface 1120 is controlled between 0.05 and 0.15, and the width of the first outer wall surface 210 is 94 mm, while the distance between the first outer wall surface 210 and the first inner wall surface 1101 is 1 mm. This configuration, while ensuring internal leakage performance, also helps prevent interference between the valve core and the inner walls of the valve body during valve core movement and when the valve core is in the first and second working positions.

[0081] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the technical solutions formed by the combination of these technical features do not contradict each other, they should be considered to be within the scope of this specification.

[0082] The above examples illustrate the principles and implementation methods of this utility model. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of this utility model.

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