Electric valve

Abstract

An electric valve, comprising a valve component (2) and a valve body (1), wherein the valve component (2) is connected to the valve body (1) in a fixed or limited manner; the valve component (2) comprises a valve core assembly (22) and a valve seat assembly (21), wherein the valve seat assembly (21) comprises a valve seat portion (211), the valve seat portion (211) having a valve port (2111), and the valve core assembly (22) can adjust a circulation area of the valve port (2111) and close the valve port (2111); and the valve body (1) has a first circulation channel (11) and a second circulation channel (12), the valve body (1) comprises a fitting portion (14), and a low-flow passage (4) is provided between the valve seat portion (211) and the fitting portion (14). The electric valve comprises a first working state, and in the first working state, the valve core assembly (22) closes the valve port (2111), and the first circulation channel (11) and the second circulation channel (12) can be in communication with each other by means of the low-flow passage (4). The electric valve, by means of a mechanical structure, achieves arrangement of the low-flow passage, and the circulation area of the low-flow passage is constant, which is beneficial to providing a stable and accurate low flow for the electric valve after the valve core assembly closes the valve port.

Description

An electric valve

[0001] This application claims priority to Chinese Patent Application No. 202410521051.2, filed on April 26, 2024, entitled "An Electric Valve", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of fluid control technology, specifically to an electric valve. Background Technology

[0003] In related technologies, electric valves are used to regulate refrigerant flow. An electric valve includes a valve core assembly and a valve seat assembly. The valve seat assembly has a valve port, and the valve core assembly can cooperate with the valve port to adjust the flow area of ​​the valve port, thereby regulating the refrigerant flow. When the system in which the electric valve operates requires the electric valve to maintain a stable low flow rate, how to provide a stable and precise low flow rate is a technical problem that needs to be considered by those skilled in the art. Summary of the Invention

[0004] The purpose of this application is to provide an electric valve that can provide a stable and precise small flow rate.

[0005] To achieve the above objectives, one embodiment of this application adopts the following technical solution:

[0006] An electric valve includes a valve component and a valve body. The valve component is fixedly connected or limitedly connected to the valve body. The valve component includes a valve core assembly and a valve seat assembly. The valve seat assembly includes a valve seat portion with a valve port. The valve core assembly can adjust the flow area of ​​the valve port and close the valve port. The valve body has a first flow channel and a second flow channel. The valve body includes a mating portion. A small flow passage is provided between the valve seat portion and the mating portion. The electric valve includes a first operating state. In the first operating state, the valve core assembly closes the valve port, and the first flow channel and the second flow channel are connected through the small flow passage.

[0007] In the embodiments of the electric valve provided in this application, the valve body includes a mating part, and a small flow passage is provided between the valve seat part and the mating part. The electric valve includes a first working state. In the first working state, the valve core assembly closes the valve port, and the first flow passage and the second flow passage can be connected through the small flow passage. The embodiments of this application achieve the setting of the small flow passage through a mechanical structure. The flow area of ​​the small flow passage is constant, which is beneficial to provide a stable and precise small flow to the electric valve after the valve core assembly closes the valve port. Attached Figure Description

[0008] Figure 1 is a front view of the structure of the first embodiment of the electric valve provided in this application;

[0009] Figure 2 is a cross-sectional view of the electric valve along plane AA in Figure 1;

[0010] Figure 3 is a front view of the valve component in Figure 2.

[0011] Figure 4 is a cross-sectional view of the valve component along the BB plane in Figure 3;

[0012] Figure 5 is a cross-sectional structural schematic diagram of another embodiment of the first embodiment of the electric valve;

[0013] Figure 6 is a cross-sectional structural schematic diagram of a second embodiment of the electric valve;

[0014] Figure 7 is a cross-sectional structural schematic diagram of another embodiment of the second embodiment of the electric valve;

[0015] Figure 8 is a cross-sectional structural schematic diagram of another embodiment of the second embodiment of the electric valve;

[0016] Figure 9 is a cross-sectional structural schematic diagram of another embodiment of the second embodiment of the electric valve;

[0017] Figure 10 is a cross-sectional structural schematic diagram of a third embodiment of the electric valve;

[0018] Figure 11 is a cross-sectional structural schematic diagram of another embodiment of the third embodiment of the electric valve. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0020] Referring to Figures 1-4, in one embodiment of the electric valve 100, the electric valve 100 includes a valve body 1, a valve component 2, and a coil assembly 3. The valve component 2 is fixedly connected to or limited by the valve body 1, and the coil assembly 3 is fixedly connected to or limited by the valve body 1. In this embodiment, the valve component 2 and the valve body 1 are connected by threads, but they can also be fixed or limited by snap-fit ​​or other methods. The coil assembly 3 can be fixedly connected to or limited by the valve body 1 by screws, snap-fit, or other methods. The valve body 1 has a valve body cavity 13, and at least a portion of the valve component 2 is located in the valve body cavity 13. In other embodiments, the coil assembly 3 can be fixedly connected to the valve component 2, and then fixedly connected or limited by the two components to the valve body 1. In this embodiment, the valve body 1 is a separate valve block. In other embodiments, the valve body 1 can also be part of a system, such as part of a heat exchanger or an integrated component flow channel plate.

[0021] Referring to Figures 1-4, in this embodiment, the valve component 2 includes a valve seat assembly 21 and a valve core assembly 22. The valve seat assembly 21 has a valve seat portion 211 with a valve port 2111. The valve core assembly 22 can close the valve port 2111 and adjust the flow area of ​​the valve port 2111, thereby adjusting the flow rate of the refrigerant in the system. This system can be, for example, a commercial, residential, or vehicle thermal management system or other systems requiring thermal management, such as a battery thermal management system or an electrical device thermal management system. Regarding how to make the valve core assembly 22 move relative to the valve port 2111 and adjust the flow area of ​​the valve port 2111, the following schematically illustrates one method for making the valve core assembly 22 move relative to the valve port 2111.

[0022] Referring to Figures 1-4, in this embodiment, valve component 2 further includes a nut assembly 23, a sleeve 24, and a rotor assembly 25. Coil assembly 3 includes a stator assembly 31, located outside the sleeve 24, and the rotor assembly 25, located inside the sleeve 24. Valve core assembly 22 is connected to rotor assembly 25. Passing a predetermined current through the stator assembly 31 generates an excitation magnetic field, causing the rotor assembly 25 to rotate. The rotor assembly 25 then drives the valve core assembly 22 to rotate. The valve core assembly 22 is threadedly engaged with the nut assembly 23, converting the rotation of the rotor assembly 25 into axial movement of the valve core assembly 22 relative to the valve seat assembly 21. The valve core assembly 22 engages with the valve port 2111, adjusting the flow area or opening of the valve port 2111 to regulate the refrigerant flow rate in the system. Alternatively, planetary gears, bearings, or other transmission methods can be used to achieve axial movement of the valve core assembly 22 relative to the valve seat assembly 21.

[0023] Referring to Figures 1-4, in this embodiment, the valve body 1 includes a first flow channel 11, a second flow channel 12, and the aforementioned valve body cavity 13, with at least a portion of the valve seat assembly 21 located in the valve body cavity 13. The valve body 1 also includes a mating portion 14, with a small flow passage 4 between the valve seat portion 211 and the mating portion 14. The electric valve includes a first operating state, in which the valve core assembly 22 closes the valve port 2111, and the first flow channel 11 and the second flow channel 12 are connected through the small flow passage 4. In this embodiment, the mating portion 14 is located on the bottom wall forming the valve body cavity 13. With the small flow passage 4 between the valve seat portion 211 and the mating portion 14, after the valve core assembly 22 closes the valve port 2111 (ignoring the possibility of machining accuracy errors preventing the valve port 2111 from being completely closed), i.e., in the first operating state, the first flow channel 11 and the second flow channel 12 are connected through the small flow passage 4. The small flow passage 4 is set up through the above-described mechanical structure. After the valve core assembly 22 closes the valve port 2111, a small flow conduction passage with a constant flow area is obtained, maintaining a preset and stable small flow conduction between the first flow channel 11 and the second flow channel 12. This achieves small flow conduction without relying on the cooperation between the valve core assembly 22 and the valve port 2111 to adjust the flow area of ​​the valve port 2111, resulting in a more stable and precise small flow. This ensures stable operation of the thermal management system under the required precise low load conditions. The ratio of the flow area of ​​the small flow passage 4 to the cross-sectional area of ​​the valve port 2111 is within the range of 0.2%-8%, and can be flexibly preset according to the needs of different systems. Of course, in this embodiment, the electric valve also includes a second working state. In the second working state, the valve core assembly 22 opens the valve port 2111, allowing flow conduction in both the valve port 2111 and the small flow passage 4.

[0024] In this embodiment, the mating part 14 has a first through hole 141, which penetrates the mating part 14. A portion of the valve seat 211 is located in the first through hole 141, or at least a portion of the valve seat 211 is projected along the axial direction of the valve component 2 into the first through hole 141. The specific structure will be described in detail later.

[0025] Referring to Figures 1-4, in this embodiment, the valve body cavity 13 is directly connected to the first flow channel 11, and the valve body cavity 13 is connected to the second flow channel 12 through the small flow passage 4. In this embodiment, the first flow channel 11 serves as the refrigerant inlet channel, and the second flow channel 12 serves as the refrigerant outlet channel. Of course, in other embodiments, the two can be reversed. The valve seat portion 211 has a connecting hole 2112 and a valve seat cavity 2113. The connecting hole 2112 is located on the upper side of the valve port 2111, and the connecting hole 2112 has an opening on the outer peripheral wall of the valve seat portion 2111. In this embodiment, the valve core assembly 22 moves downward to approach the valve port 2111 and moves upward to move away from the valve port, with the upper and lower positions defined by this reference. Part of the valve core assembly 22 is located in the valve seat cavity 2113, which is connected to the valve body cavity 13 through the connecting hole 2112. The valve seat cavity 2113 can be connected to the second flow channel 12 through the valve port 2111. In this embodiment, the valve seat assembly 21 further includes a connecting portion 212. The sleeve 24 is fixedly connected to the connecting portion 212 by welding. The connecting portion 212 is fixedly connected to the valve seat portion 211 by welding or snap-fit. Of course, in other embodiments, the connecting portion 212 and the valve seat portion 211 can also be integrally formed. The connecting portion 212 has external threads, and the inner peripheral wall forming the valve body cavity 13 has internal threads. The valve seat assembly 21 is fixedly connected to the valve body 1 by the connecting portion 212, which simplifies the connection between the two.

[0026] Referring to Figures 1-4, a first embodiment of the electric valve 100 is illustrated. In this embodiment, the valve seat portion 211 includes a lower valve seat portion 2114, which is located below the connecting hole 2112, and at least a portion of the lower valve seat portion 2114 is located in the first through hole 141. In this embodiment, the circumferential gap between the outer peripheral wall of the lower valve seat portion 2114 and the wall forming the first through hole 141 forms a small flow passage 4, and the structure can be relatively simple.

[0027] Referring to Figure 5, in another embodiment of this practice, the outer peripheral wall of the lower valve seat portion 2114 and / or the wall forming the first through hole 141 has a first groove 41. The first groove 41 forms a small flow passage 4. In this embodiment, the illustration shows the first groove 41 located on the outer peripheral wall of the lower valve seat portion 2114. In this embodiment, the valve seat portion 211 and the wall forming the first through hole 141 can be in abutting fit or have a very small gap reserved for easy assembly. The small flow passage 4 is realized through the first groove 41, which facilitates the calculation of the flow area of ​​the small flow passage 4. The first groove 41 is easy to process and its cross-sectional area is easy to calculate. The number of first grooves 41 can be several. For example, when the first groove 41 is provided on the outer peripheral wall of the lower valve seat portion 2114, the first groove 41 can be set as two, and the two can be symmetrically arranged.

[0028] Referring to Figure 5, further in this embodiment, the wall forming the first through hole 141 is arranged substantially vertically, and the outer peripheral wall of the lower valve seat portion 2114 is also arranged substantially vertically. The first groove 41 is arranged substantially vertically, which facilitates processing. Alternatively, in another embodiment, the first groove 41 is spiral-shaped (not shown in the figure), with one end communicating with the valve body cavity 13 and the other end communicating with the first through hole 141 or the second flow channel 12. The shape and arrangement of the first groove 41 described above facilitate precise control of the flow area of ​​the small flow passage 4.

[0029] Referring to Figure 6, a second embodiment of the electric valve 100 is illustrated. In this embodiment, the valve seat portion 211 also includes a lower valve seat portion 2114, which is located below the connecting hole 2112. In this embodiment, the lower valve seat portion 2114 includes a first portion 2115, the outer diameter of which is larger than the inner diameter of the first through hole 141. An annular gap exists between the lower end wall of the first portion 2115 and the upper surface of the mating portion 14. This annular gap forms at least a portion of the small flow passage 4, which connects the valve body cavity 13 and the first through hole 141. In this case, the first through hole 141 can be used as part of the small flow passage 4. In this embodiment, the lower end wall of the first portion 2115 is generally horizontal, and the upper surface of the mating portion 14 is generally horizontal. The structure forming the annular gap is relatively simple, which helps to simplify the processing difficulty.

[0030] Referring to Figure 7, in another embodiment of this invention, the lower end wall of the first part 2115 and / or the upper surface of the mating part 14 have a first groove 41, which forms at least a portion of the small flow passage 4. In this embodiment, the upper surfaces of the first part 2115 and the mating part 14 can abut against each other or have a very small gap for easy assembly and positioning. The small flow passage 4 is realized through the first groove 41, which facilitates the calculation of the flow area of ​​the small flow passage 4. The first groove 41 is easy to process and its cross-sectional area is easy to calculate. There can be several first grooves 41. For example, when the first groove 41 is provided on the lower end wall of the first part 2115, there can be two first grooves 41, which can be symmetrically arranged. In this embodiment, the lower end wall of the first part 2115 is generally horizontal, and the upper surface of the mating part 14 is generally horizontal.

[0031] Referring to Figure 8, in a further second embodiment of this application, the lower valve seat portion 2114 also includes a small-diameter portion 2116. The small-diameter portion 2116 is located below the first portion 2115 and is generally cylindrical. At least a portion of the small-diameter portion 2116 is located in the first through hole 141. A circumferential gap is formed between the outer peripheral wall of the small-diameter portion 2116 and the wall forming the first through hole 141. This circumferential gap forms part of the small flow passage 4. The small-diameter portion 2116 helps to buffer the flow and prevent the flow at the small flow passage 4 from affecting the flow through the valve port 2111. It also facilitates the control of the flow area of ​​the small flow passage 4 and helps to prevent excessive flow in the small flow passage 4.

[0032] Referring to FIG9, in another embodiment of this embodiment, the first part 2115 is arranged with an inclined surface, and the end of the first part 2115 is connected to the small diameter part 2116. The first part 2115 gradually narrows towards the small diameter part 2116. With this arrangement, the mating part 14 is approximately at a right angle, and there is a gap between the inclined first part 2115 and the upper end face of the mating part 14. A circumferential gap is formed between the outer peripheral wall of the small diameter part 2116 and the wall forming the first through hole 141. The above structure forms a small flow passage 4. This arrangement not only facilitates the conduction of small flow but also saves material of the valve seat part 211.

[0033] Referring to Figure 10, a third embodiment of the electric valve 100 is illustrated. In this embodiment, the valve seat portion 211 also includes a lower valve seat portion 2114, which is located below the communicating hole 2112. In this embodiment, the lower valve seat portion 2114 is inclined. In the first embodiment of this example, the mating portion 14 includes a first inclined portion 142, and the inclination of the lower valve seat portion 2114 is greater than or equal to the inclination of the first inclined portion 142. The annular gap between the lower valve seat portion 2114 and the first inclined portion 142 forms a small flow passage 4. This configuration simplifies the manufacturing process.

[0034] Referring to Figure 11, in another embodiment of this invention, the lower valve seat portion 2114 and / or the first inclined portion 142, which is shaped like a slope, have a first groove 41, which forms a small flow passage 4. In this embodiment, the lower valve seat portion 2114 and the first inclined portion 142 can abut against each other or have a very small gap reserved for easy assembly and positioning. The small flow passage 4 is realized through the first groove 41, which facilitates the calculation of the flow area of ​​the small flow passage 4. The processing of the first groove 41 is also relatively convenient, and the number of first grooves 41 can be several.

[0035] Referring to Figure 11, in this embodiment, the first groove 41 extends in an inclined direction along the lower valve seat portion 2114 or the first inclined portion 142, which facilitates processing. Alternatively, in another embodiment, the first groove 41 is spiral-shaped, with one end communicating with the valve body cavity 13 and the other end communicating with the first through hole 141 or the second flow channel 12. The shape and arrangement of the first groove 41 facilitate precise control of the flow area of ​​the small flow passage 4.

[0036] In the third embodiment of this example, compared to the first embodiment of the first embodiment of the electric valve 100, the mating part 14 does not have a first inclined portion 142, and the portion of the mating part 14 that mates with the lower valve seat portion 2114 is approximately at a right angle. The annular gap between the mating part 14 and the first inclined portion 142 forms a small flow passage 4. Alternatively, in yet another embodiment, a first groove 41 is provided between the first inclined portion 142 and / or the mating part 14, and the first groove 41 forms a small flow passage 4.

[0037] The following describes some possible application scenarios for the electric valve 100 provided in this embodiment:

[0038] In a single-loop refrigeration system, during the use of electric valve 100, the compressor is lubricated by oil in the refrigerant. Complete closure of valve port 2111 can lead to insufficient oil or even burnout of the compressor. Therefore, a small flow passage 4 is required to allow lubricating oil to flow and lubricate the compressor.

[0039] Specifically, the flow area of ​​the small flow passage 4 of the electric valve 100 needs to be slightly larger than the flow rate required for compressor lubrication, and this flow rate should be as small as possible to minimize additional cooling capacity.

[0040] In another application scenario, the thermal management system where the electric valve 100 is located requires a large load of cooling and heating to quickly change the temperature of a certain space. After reaching the specified temperature, it is necessary to maintain the temperature of the space stably. Due to unstable environmental conditions and very low environmental load, intermittent cooling and heating are required, and the refrigerant flow rate required by the thermal management system is small. Due to the processing errors, assembly errors, and control errors of the components of the electric valve 100, when the electric valve 100 controls the movement of the valve core assembly 22, there will be a certain stroke deviation between the actual position of the valve core assembly 22 and the predetermined position in the execution control program. This stroke deviation range accounts for a large proportion of the total stroke of the electric valve 100. When the stroke deviation ratio is greater than the required opening ratio, the electric valve 100 cannot be accurately adjusted to the required opening range. The closer the required opening value is to zero, the greater the impact, which cannot meet the requirements of the application scenario. However, the setting of the small flow passage 4 in this embodiment can effectively solve this problem.

[0041] In a specific application scenario, during spring and autumn, the environmental conditions are not stable, and the required cooling and heating range is large. In areas that are more sensitive to temperature changes, such as aircraft cabins and large vehicle compartments, the maximum flow rate required by the thermal management system during operation is 250g / s, and the minimum flow rate is 2.5-7.5g / s, corresponding to an opening ratio of 1%-3%. In areas where the required cooling and heating range is large and the sensitivity to temperature changes is even greater, such as refrigerated transport compartments, the minimum opening ratio required is 0.5%.

[0042] It should be noted that the above application scenarios are only used to illustrate the present invention and are not intended to limit the application scenarios described in the present invention.

[0043] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. An electric valve, characterized in that, The system includes a valve component (2) and a valve body (1), which are fixedly connected or limitedly connected. The valve component (2) includes a valve core assembly (22) and a valve seat assembly (21). The valve seat assembly (21) includes a valve seat portion (211) with a valve port (2111). The valve core assembly (22) can adjust the flow area of ​​the valve port (2111) and close the valve port (2111). The valve body (1) has... The valve body (1) includes a first flow channel (11) and a second flow channel (12). The valve body (1) includes a mating part (14). The valve seat part (211) and the mating part (14) have a small flow passage (4). The electric valve includes a first working state. In the first working state, the valve core assembly (22) closes the valve port (2111). The first flow channel (11) and the second flow channel (12) can be connected through the small flow passage (4).

2. The electric valve according to claim 1, characterized in that, The mating part (14) has a first through hole (141) that penetrates the mating part (14). A portion of the valve seat part (211) is located in the first through hole (141), or at least a portion of the valve seat part (211) is projected along the axial direction of the valve component (2) into the first through hole (141).

3. The electric valve according to claim 2, characterized in that, The valve body (1) has a valve body cavity (13), at least a portion of the valve seat assembly (21) is located in the valve body cavity (13), the valve body cavity (13) is directly connected to the first flow channel (11), and the valve body cavity (13) is connected to the second flow channel (12) through the small flow passage (4).

4. The electric valve according to claim 2 or 3, characterized in that, The valve seat portion (211) has a connecting hole (2112) and a valve seat cavity (2113). The connecting hole (2112) is located on the upper side of the valve port (2111). The connecting hole (2112) has an opening on the outer peripheral wall of the valve seat portion (211). Part of the valve core assembly (22) is located in the valve seat cavity (2113). The valve seat cavity (2113) is connected to the valve body cavity (13) through the connecting hole (2112). The valve seat cavity (2113) can be connected to the second flow channel (12) through the valve port (2111).

5. The electric valve according to claim 4, characterized in that, The valve seat portion (211) includes a lower valve seat portion (2114), which is located below the connecting hole (2112), and at least a portion of the lower valve seat portion (2114) is located in the first through hole (141); the circumferential gap between the outer peripheral wall of the lower valve seat portion (2114) and the wall forming the first through hole (141) forms the small flow passage (4); or, the outer peripheral wall of the lower valve seat portion (2114) and / or the wall forming the first through hole (141) has a first groove (41), and the first groove (41) forms the small flow passage (4).

6. The electric valve according to claim 5, characterized in that, The wall forming the first through hole (141) is set approximately vertically, and the outer peripheral wall of the lower valve seat (2114) is set approximately vertically; the first groove (41) extends approximately vertically, or the first groove (41) is spiral-shaped, with one end of the spiral-shaped first groove (41) communicating with the valve body cavity (13), and the other end communicating with the first through hole (141) or the second flow channel (12).

7. The electric valve according to claim 4, characterized in that, The valve seat portion (211) includes a lower valve seat portion (2114), which is located below the connecting hole (2112). The lower valve seat portion (2114) includes a first portion (2115), the outer diameter of which is larger than the inner diameter of the first through hole (141). An annular gap is formed between the lower end wall of the first portion (2115) and the upper surface of the mating portion (14), which forms at least a portion of the small flow passage (4) and connects the valve body cavity (13) and the first through hole (141). Alternatively, the lower end wall of the first portion (2115) and / or the upper surface of the mating portion (14) have a first groove (41), which forms at least a portion of the small flow passage (4).

8. The electric valve according to claim 7, characterized in that, The lower valve seat portion (2114) further includes a small diameter portion (2116), which is located below the first portion (2115), and at least a portion of the small diameter portion (2116) is located in the first through hole (141); a circumferential gap is formed between the outer peripheral wall of the small diameter portion (2116) and the wall forming the first through hole (141), and the circumferential gap forms part of the small flow passage (4); the first portion (2115) is inclined, and the end of the first portion (2115) is connected to the small diameter portion (2116), and the first portion (2115) gradually narrows towards the small diameter portion (2116).

9. The electric valve according to claim 4, characterized in that, The valve seat portion (211) includes a lower valve seat portion (2114), which is located below the communicating hole (2112) and has an inclined surface. The mating part (14) includes a first inclined part (142), the inclination of the lower valve seat part (2114) is greater than or equal to the inclination of the first inclined part (142), the annular gap between the lower valve seat part (2114) and the first inclined part (142) forms a small flow passage (4), or, the lower valve seat part (2114) and / or the first inclined part (142) have a first groove (41), the first groove (41) forms the small flow passage (4); Alternatively, the mating part (14) and the lower valve seat part (2114) are approximately at right angles; the annular gap between the mating part (14) and the lower valve seat part (2114) forms a small flow passage (4); or, the lower valve seat part (2114) and / or the mating part (14) have a first groove (41), and the first groove (41) forms the small flow passage (4).

10. The electric valve according to claim 9, characterized in that, The first groove (41) extends in an inclined direction along the lower valve seat portion (2114) or the first inclined portion (142); or the first groove (41) is spiral-shaped, with one end of the first groove (41) communicating with the valve body cavity (13) and the other end communicating with the first through hole (141) or the second flow channel (12).

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