Valve device

Abstract

According to the valve device, the valve seat component of the valve device is provided with the step part, the lower end face of the sealing gasket abuts against the step part, and the second circulation channel of the valve device can communicate with a space or a gap formed between the sealing gasket and the valve seat component. A refrigerant accumulated in a space or a gap formed between the sealing gasket and the valve seat component can be discharged easily, the shape or the position of the sealing gasket is prevented from being affected by accumulated liquid, and the sealing reliability of the valve device is improved.

Description

[0001] (The application is a divisional application of the Chinese invention patent application No. 202310694363.9 with the title of "Valve device", the application date of which is 2023-06-12)

[0002] The application relates to the technical field of fluid control, in particular to a valve device. TECHNICAL FIELD

[0003] The application relates to the technical field of fluid control, in particular to a valve device. BACKGROUND

[0004] The valve device comprises a valve needle, a valve seat component, the valve seat component has a sealing gasket, the sealing gasket has a valve port, the valve needle can be matched with the valve port part to adjust the flow state of the valve port, in the related art, the sealing gasket and the main part of the valve seat component have an installation gap or an installation space, the installation gap or the installation space can accumulate refrigerant, the pressure change caused by the state of the refrigerant at this place can affect the shape or position of the sealing gasket, thereby affecting the sealing reliability of the valve device. SUMMARY

[0005] The application aims to provide a valve device which is beneficial to discharge the accumulated refrigerant in the space or gap formed between the sealing gasket and the valve seat component, avoid the shape or position of the sealing gasket being affected by the accumulated liquid, and improve the sealing reliability of the valve device.

[0006] To achieve the above-mentioned purpose, one embodiment of the application adopts the following technical scheme:

[0007] A valve device, comprising a valve needle, a valve seat component and a sealing gasket, the sealing gasket is installed on the valve seat component, the sealing gasket has a valve port, the valve needle can be matched with the sealing gasket to adjust the flow area of the valve port; the valve seat component has a stepped portion, the lower end surface of the sealing gasket abuts against the stepped portion, and the valve device has a second flow passage, the second flow passage can communicate the space or gap formed between the sealing gasket and the valve seat component.

[0008] The application provides a valve device, the valve seat component of the valve device has a stepped portion, the lower end surface of the sealing gasket abuts against the stepped portion, and the second flow passage of the valve device can communicate the space or gap formed between the sealing gasket and the valve seat component, which is beneficial to discharge the accumulated refrigerant in the space or gap formed between the sealing gasket and the valve seat component, avoid the shape or position of the sealing gasket being affected by the accumulated liquid, and improve the sealing reliability of the valve device. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 is a front view structural schematic diagram of one perspective of the first embodiment of the valve device of the application;

[0010] Figure 2 yes Figure 1 A cross-sectional view of the central valve device along plane AA;

[0011] Figure 3 yes Figure 2 A structural schematic diagram of the central valve component from one perspective;

[0012] Figure 4 yes Figure 3 A cross-sectional view of the central valve component along the BB plane;

[0013] Figure 5 yes Figure 4 Enlarged structural diagram of section A in the middle;

[0014] Figure 6 yes Figure 3 A cross-sectional view of the central valve component from another perspective;

[0015] Figure 7 This is a three-dimensional structural schematic diagram of the first valve seat component from one perspective;

[0016] Figure 8 yes Figure 7 A front view of the first valve seat component from one perspective;

[0017] Figure 9 yes Figure 8 A cross-sectional view of the first valve seat component along the CC plane;

[0018] Figure 10 This is a partially enlarged structural diagram of part A in another embodiment of the first embodiment of the valve device;

[0019] Figure 11 This is a cross-sectional structural schematic diagram of another embodiment of the first embodiment of the valve device. Detailed Implementation

[0020] The following is in conjunction with the appendix Figures 1-11 The invention will be further described below with reference to specific embodiments. Numerous specific details are set forth in the following detailed description to provide a comprehensive understanding of the invention. However, those skilled in the art should understand that the specific components, devices, and features illustrated in the drawings and described herein are merely exemplary and should not be considered limiting.

[0021] The valve device 100 can be applied to vehicle thermal management systems or air conditioning systems, especially to circulation systems where CO2 is used as a refrigerant. The vehicle thermal management system includes the thermal management system for new energy vehicles. In the vehicle thermal management system, the valve device 100 is often used as a throttling element or a switching element.

[0022] Combination Figures 1-11Schematic illustration: Valve device 100 includes valve component 1, valve body 101, and coil assembly 102. Valve component 1 is fixedly connected to valve body 101, and coil assembly 102 is fixedly connected to valve body 101. Valve body 101 has valve body cavity 1013, and at least a portion of valve component 1 is located in valve body cavity 1013. Of course, in other embodiments, coil assembly 102 can be fixedly connected to valve component 1, and the two can be assembled and then fixedly connected to valve body 101. In this embodiment, valve body 101 is a separate valve block. In other embodiments, valve body 101 can also be part of a system, such as part of a heat exchanger or flow channel plate. Coil assembly 102 includes stator assembly. Valve component 1 includes valve seat component 11, sleeve 13, and rotor assembly 14. Sleeve 13 is fixedly connected to valve seat component 11. Stator assembly 1021 is located outside sleeve 13, and rotor assembly 14 is located inside sleeve 13. Valve component 1 also includes a lead screw portion 15 and a nut assembly 16. The lead screw portion 15 is fixedly connected to the rotor assembly 14, and the lead screw portion 15 and the nut assembly 16 are threaded together. When a predetermined current is applied to the stator assembly 1021, an excitation magnetic field is generated, which drives the rotor assembly 14 to rotate. The rotor assembly 14 can drive the lead screw portion 15 to rotate. The lead screw portion 15 can drive the subsequent valve needle 2 to move relative to the valve port 121.

[0023] Combination Figures 1-9In a first embodiment of the valve device 100, the valve device 100 includes a valve seat component 11 and a sealing gasket 12. That is, the valve device 1 includes a valve seat component 11 and a sealing gasket 12, with the sealing gasket 12 mounted on the valve seat component 11 and having a valve port 121. The valve device 1 also includes a lead screw portion 15 and a rotor assembly 14. In this embodiment, the lead screw portion 15 is fixedly connected to the rotor assembly 14, and the rotor assembly 14 can drive the lead screw portion 15 to move. The valve device 1 includes a valve needle 2 and a second valve needle 21. The lead screw portion 15 is connected to the second valve needle 21, which has a second valve port 22. The lead screw portion 15 enables the second valve needle 21 to move relative to the second valve port 22, and the second valve needle 21 can drive the valve needle 2 to move relative to the valve port 121, adjusting the flow area of ​​the valve port 121, thereby adjusting the refrigerant flow rate of the valve port 121. In this embodiment, the lead screw 15 is connected to the second valve needle 21. A bearing component is provided at the connection between the lead screw 15 and the second valve needle 21. The lower end of the lead screw 15 is riveted to form a riveted portion (not shown in the figure) supporting the lower end face of the bearing component. In this embodiment, the valve needle 2 abuts against the upper end face of the sealing gasket 12, thereby closing the valve port 121. In other embodiments, the valve needle 2 may also abut against the inner side of the sealing gasket 12 to close the valve port 121. The sealing gasket 12 is made of non-metallic material. In this embodiment, the material of the sealing gasket 12 includes resin material. It is not excluded that the sealing gasket 12 contains impurities or other small amounts of specific metallic components. The resin material may be, for example, PTFE (Polytetrafluoroethylene), PEEK (polyether ether ketone), PPS (polyphenylene sulfide), etc. In other embodiments, the sealing gasket 12 may be a composite structure of resin material and rubber material. For example, the side of the sealing gasket 12 that abuts against the valve needle 2 is a resin material layer, and the lower side of the resin material layer is a rubber material layer. (Refer to...) Figure 11 In other embodiments, valve component 1 may not have a second valve needle 21. The lead screw 15 is connected to the valve needle 2. The lead screw 15 can drive the valve needle 2 to move relative to the valve port 121. The valve needle 2 cooperates with the sealing gasket 12 to adjust the flow area of ​​the valve port 121, thereby adjusting the flow rate of the refrigerant.

[0024] Combination Figures 2-6 In the first embodiment, the valve seat component 11 has a valve seat cavity 116, at least a portion of the valve needle 2 is located in the valve seat cavity 116, the valve seat cavity 116 includes a first valve cavity 111 and a second valve cavity 112, the first valve cavity 111 is located below the second valve cavity 112, when the valve needle 2 abuts against the valve port 121, the first valve cavity 111 and the second valve cavity 112 are not connected, when the valve needle 2 is separated from the valve port 121, the first valve cavity 111 and the second valve cavity 112 are connected.

[0025] Combination Figures 2-6In the first embodiment, the valve seat component 11 has several channels 113, which are spaced apart circumferentially along the valve seat component 11. The channels 113 communicate with the valve seat cavity 116, specifically, the channels 113 communicate with the second valve cavity 112 of the valve seat cavity 116. The valve device 100 also includes a second seal 42 and a third seal 43. The second seal 42 is located on the lower side of the channel 113, and the third seal 43 is located on the upper side of the channel 113. The second seal 42 is pressed between the valve seat component 11 and the valve body 101, and the third seal 43 is pressed between the valve seat component 11 and the valve body 101. The valve body 101 includes a first flow channel 1011 and a second flow channel 1012. The first flow channel 1011 can serve as a refrigerant inlet channel, and the second flow channel 1012 can serve as a refrigerant outlet channel, or vice versa. In this embodiment, the first valve chamber 111 is connected to the first flow channel 1011, and the second valve chamber 112 is connected to the second flow channel 1012 through the channel 113. The first flow channel 1011 and the second flow channel 1012 are connected by the valve port 121 to adjust the on / off state or the flow rate.

[0026] Combination Figures 2-6 In this embodiment, the valve seat component 11 has a stepped portion 115, and the lower end face of the sealing gasket 12 abuts against the stepped portion 115. A first flow passage 31 is formed between the lower end face of the sealing gasket 12 and the stepped portion 115, which connects the space or gap formed between the sealing gasket 12 and the valve seat component 11. In this embodiment, one end of the first flow passage 31 connects to the space or gap formed between the sealing gasket 12 and the valve seat component 11, and the other end connects to the first valve chamber 111 of the valve seat component 11. This arrangement can prevent the refrigerant accumulated in the space or gap formed between the sealing gasket 12 and the valve seat component 11 from affecting the shape or position of the sealing gasket 12 due to pressure changes caused by state changes, thereby affecting the sealing reliability of the valve device 100. For example, the following situation may occur: the refrigerant accumulated in the space or gap formed between the sealing gasket 12 and the valve seat component 11 may cause thermal expansion, resulting in pressure and causing the sealing gasket 12 to shift or deform. In this case, the position where the valve needle 2 abuts against the sealing gasket 12 may change, leading to increased leakage at the abutment. Providing a first flow passage 31 can prevent this from happening. In other embodiments, the valve body 101 may be formed into the valve seat component 11, and the valve seat component 11 may form a stepped portion 115. The lower end face of the sealing gasket 12 abuts against the stepped portion 115, and a first flow passage 31 is provided between the lower end face of the sealing gasket 12 and the stepped portion 115. In this embodiment, the valve seat component 11 has a limiting portion 114, which abuts against the upper end face of the sealing gasket 12, pressing the sealing gasket 12 between the limiting portion 114 and the stepped portion 115. Of course, the sealing gasket 12 can also be installed in other ways.

[0027] CombinationFigures 2-6 In this embodiment, the valve seat component 11 is relatively independent from the valve body 101, and the valve seat component 11 is fixedly connected to the valve body 101. The connection method includes threaded connection, crimping, etc. The valve seat component 11 can be a split structure, with the split parts fixedly connected to form the valve seat component 11, or the valve seat component 11 can be a one-piece molded structure. An example is given with the valve seat component 11 as a split structure. In this embodiment, the valve seat component 11 includes a first valve seat component 51, a second valve seat component 52, and a third valve seat component 53. The first valve seat component 51 and the second valve seat component 52 are separately formed and fixedly connected by welding, riveting, etc., and the second valve seat component 52 and the third valve seat component 53 are separately formed and fixedly connected by welding, riveting, etc.

[0028] Combination Figures 2-6 In this embodiment, the stepped portion 115 includes a bottom surface 1151 and a side surface 1152. The bottom surface 1151 is formed on the first valve seat component 51, and the lower end surface of the sealing gasket 12 abuts against the bottom surface 1151. In this embodiment, the side surface 1152 includes a portion of the first valve seat component 51 and a portion of the second valve seat component 52. In other embodiments, the side surface 1152 may be formed solely by the first stepped portion 115 or solely by the second valve seat component 52.

[0029] Combination Figures 2-6 In this embodiment, the valve device 100 further includes a first sealing element 41, which is located between the sealing gasket 12 and the valve seat component 11. The first sealing element 41 is pressed between the sealing gasket 12 and the valve seat component 11, and the first flow passage 31 can connect the space or gap on the lower side or the inner side of the first sealing element 41.

[0030] Combination Figures 2-6In one specific embodiment of this example, the first sealing member 41 is located in the radial direction of the valve device 100 between the outer periphery of the sealing gasket 12 and the inner peripheral wall of the valve seat component 11. The first sealing member 41 is pressed between the outer periphery of the sealing gasket 12 and the inner peripheral wall of the valve seat component 11. The first flow passage 31 can connect the space or gap under the first sealing member 41. With this configuration, the space or gap under the first sealing member 41 can be connected to the first valve cavity 111 through the first flow passage 31. The first flow passage 31 can prevent the accumulation of refrigerant in the space or gap under the first sealing member 41, and prevent the accumulation of refrigerant from causing the pressure to deform or deviate the position of the sealing gasket 12, which would affect the sealing performance of the valve port 121 when the valve is closed, and increase the leakage of the valve port 121. For example, the refrigerant accumulated in the space or gap under the first sealing member 41 expands due to heat, thereby generating pressure that causes the valve port 121 to deviate or deform. In this embodiment, the first sealing element 41 is pressed between the sealing gasket 12 and the side surface 1152 of the stepped portion, and the sealing gasket 12 and the side surface 1152 of the stepped portion are sealed by the first sealing element 41. In another embodiment of this embodiment, the first sealing element 41 can also be disposed between the lower end face of the sealing gasket 12 and the bottom surface 1151 of the stepped portion. In this case, the first flow can prevent refrigerant from accumulating in the space or gap inside the first sealing element 41. Of course, the first sealing element 41 can simultaneously satisfy both of the above-mentioned configuration methods.

[0031] Combination Figures 2-6 In one specific embodiment of the first embodiment, the bottom surface 1151 of the stepped portion has a first groove 311. The first groove 311 is located on the bottom surface 1151 of the stepped portion and is recessed from the bottom surface 1151 of the stepped portion toward the sealing gasket 12. The first groove 311 forms a first flow passage 31, which can connect to the lower space or gap of the first sealing member 41. The number of first grooves 311 can be one or more.

[0032] Reference Figure 10 In another embodiment of the first embodiment, compared to the previous embodiment, the sealing gasket 12 has a first groove 311 located on the lower end face of the sealing gasket 12. The first groove 311 is disposed from the lower end face of the sealing gasket 12 away from the bottom surface 1151 of the stepped portion, and forms a first flow passage 31. The first flow passage 31 can connect to the lower space or gap of the first sealing member 41. The number of first grooves 311 can be one or more.

[0033] In another embodiment of the first embodiment, compared with the aforementioned embodiment, in this embodiment, the sealing gasket 12 has a first groove located on the lower end face of the sealing gasket 12, the step portion 115 includes a bottom surface 1151, the step portion 115 has a second groove (not shown in the figure), the second groove is located on the bottom surface 1151, the second groove is disposed opposite to the first groove, and the first groove and the second groove cooperate to form a first flow passage 31. The number of first grooves can be several, and the number of second grooves can be several.

[0034] Combination Figures 2-6 In the first embodiment, the valve device 100 further includes a second flow passage 32, which connects to a space or gap on the upper or outer side of the first seal 41. The second flow passage 32 serves the same function as the first flow passage 31, preventing refrigerant buildup that could cause the sealing gasket 12 to shift or deform. The combined effect of the first and second flow passages 31 provides a better overall result. This embodiment focuses on the second flow passage 32 connecting to the space or gap on the upper side of the first seal 41.

[0035] Combination Figures 2-9In one embodiment of this invention, the valve seat component 11 includes a first valve seat component 51 and a second valve seat component 52. The first valve seat component 51 and the second valve seat component 52 are fixedly connected. The fixed connection method includes welding and interference fit. Welding is used as an example for further explanation. The second flow passage 32 includes a first through hole 321 and a first gap 322. The first through hole 321 is located on the side wall of the first valve seat component 51. The first through hole 321 has an opening on the outer side wall of the first valve seat component 51. The first through hole 321 penetrates the first valve seat component 51 along the radial direction of the valve device 100. In this embodiment, the first valve seat component 51 has a first extension 511, and the first through hole 321 is disposed in the first extension 511. The first gap 322 is located between the first valve seat component 51 and the second valve seat component 52. The first gap 322 can communicate with the first through hole 321. In this embodiment, the second valve seat component 52 has a second extension 521, at least a portion of which is located inside the first valve seat component 51. The first gap 322 is the gap between the lower end face of the second extension 521 and the first valve seat component 51, and may further include the gap between the outer side of the second extension 521 and the first valve seat component 51. The first through hole 321 can communicate with the space or gap on the upper side of the first seal 41 through the first gap 322. In this embodiment, the first valve seat component 51 and the second valve seat component 52 are fixedly connected by welding. A weld is formed between the top surface of the first extension 511 and the second valve seat component 52. In this embodiment, the welding method is laser welding. In other embodiments, it may also be brazing or other welding methods.

[0036] In another embodiment of this invention, compared to the above embodiment, the first through hole 321 may not be provided. The first extension 511 of the first valve seat component 51 is welded to the second valve seat component 52 to form a weld. The weld is not a complete circle, and several gaps are reserved between the welds. These gaps constitute part of the second flow passage 32, which serves to replace the first through hole 321 in the above embodiment.

[0037] In another embodiment of this example, the second flow passage 32 includes a first through hole 321. The first through hole 321 is located on the side wall of the valve seat component 11. The first through hole 321 penetrates the valve seat component 11 in the radial direction of the valve device 100. The first through hole 321 has an opening on the outer side wall of the valve seat component 11 and an inner opening located on the inner peripheral wall of the valve seat component 11. The inner opening directly connects to the space or gap on the upper or outer side of the first sealing member 41. This allows for the convenient discharge of refrigerant accumulated in the space or gap formed between the sealing gasket 12 and the valve seat component 11, further improving the sealing performance of the valve device. Specifically, the first through hole 321 directly connects to the space or gap on the upper side of the first sealing member 41.

[0038] In the above embodiment, the first through hole 321 is circular in shape, which facilitates its processing. There are two first through holes 321, which makes it easier to discharge refrigerant accumulated in the space or gap formed between the sealing gasket 12 and the valve seat component 11.

[0039] In another embodiment of this invention, the valve seat component 11 includes a limiting portion 114. Specifically, in this embodiment, the second valve seat component 52 includes a limiting portion 114, which abuts against the upper end face of the sealing gasket 12. The lower end face of the limiting portion 114 and / or the upper end face of the sealing gasket 12 form a third groove (not shown in the figure). The third groove connects the space or gap between the outer periphery of the sealing gasket 12 and the inner peripheral wall of the valve seat component 11. The third groove forms a second flow passage 32, or the third groove forms a partial second flow passage 32. The third groove forming a second flow passage 32 means that the second flow passage 32 mentioned in the previous embodiment may not be provided. The third groove forming a partial second flow passage 32 means that, based on the second flow passage 32 provided in the previous embodiment, a third groove is added as part of the second flow passage 32, i.e., the second flow passage 32 is composed of multiple parts. Alternatively, a through hole can be provided that penetrates the limiting portion 114 along the axial direction of the valve device. This through hole connects to the third groove or directly connects to the space or gap on the upper side of the first sealing member 41.

[0040] In the first embodiment of the electric valve described above, a first sealing element 41 is provided. However, if the sealing performance between the sealing gasket 12 and the stepped portion 115 is satisfied, the first sealing element 41 may not be provided.

[0041] This application also provides a second embodiment of the valve device 100. In this embodiment, the valve device 100 includes a valve needle 2, a valve seat component 11, and a sealing gasket 12. The sealing gasket 12 is installed on the valve seat component 11 and has a valve port 121. The valve needle 2 can cooperate with the sealing gasket 12 to adjust the flow area of ​​the valve port 121. The valve device 100 has a second flow passage 32, which can connect the space or gap formed between the sealing gasket 12 and the valve seat component 11. The second flow passage 32 is specifically the same as the second flow passage 32 involved in the above embodiment. It should be noted that in this embodiment, only the second flow passage 32 can be provided, or a first flow passage 31 can be further provided on the basis of the second flow passage 32. The specific implementation scheme can be obtained by combining the structure of the above embodiment, which will not be described in detail here. In this embodiment, a first sealing element 41 is provided. However, if the sealing performance between the sealing gasket 12 and the stepped portion 115 is satisfied, the first sealing element 41 may not be provided.

[0042] 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. A valve device (100), characterized in that, The valve device (100) includes a valve needle (2), a valve seat component (11), and a sealing gasket (12). The sealing gasket (12) is installed on the valve seat component (11). The sealing gasket (12) has a valve port (121). The valve needle (2) can cooperate with the sealing gasket (12) to adjust the flow area of ​​the valve port (121). The valve seat component (11) has a stepped portion (115). The lower end face of the sealing gasket (12) abuts against the stepped portion (115). The valve device (100) has a second flow passage (32). The second flow passage (32) can connect the space or gap formed between the sealing gasket (12) and the valve seat component (11).

2. The valve device (100) according to claim 1, characterized in that, The valve device (100) further includes a first seal (41) located between the sealing gasket (12) and the valve seat component (11). The first seal (41) is pressed between the sealing gasket (12) and the valve seat component (11). The second flow passage (32) can connect the space or gap on the upper or outer side of the first seal (41).

3. The valve device (100) according to claim 2, characterized in that, The first seal (41) is located in the radial direction of the valve device (100) between the outer periphery of the sealing gasket (12) and the inner peripheral wall of the valve seat component (11). The first seal (41) is pressed between the outer periphery of the sealing gasket (12) and the inner peripheral wall of the valve seat component (11). The second flow passage (32) can connect the space or gap on the upper or outer side of the first seal (41).

4. The valve device (100) according to any one of claims 1-3, characterized in that, The second flow passage (32) includes a first through hole (321), which is located on the side wall of the valve seat component (11). The first through hole (321) penetrates the valve seat component (11) in the radial direction of the valve device (100), and has an opening on the outer side wall of the valve seat component (11).

5. The valve device (100) according to claim 4, characterized in that, The first through hole (321) has an inner opening located on the inner peripheral wall of the valve seat component (11), and the inner opening directly connects to the space or gap on the upper or outer side of the first seal (41).

6. The valve device (100) according to any one of claims 1-3, characterized in that, The valve seat component (11) includes a limiting part (114) that abuts against the upper end face of the sealing gasket (12). The lower end face of the limiting part (114) and / or the upper end face of the sealing gasket (12) form a third groove. The third groove connects the space or gap between the outer periphery of the sealing gasket (12) and the inner peripheral wall of the valve seat component (11). The third groove forms a second flow passage (32), or the third groove forms part of the second flow passage (32).

7. The valve device (100) according to any one of claims 1-3, characterized in that, The valve seat component (11) includes a first valve seat component (51) and a second valve seat component (52). The stepped portion (511) is located in the first valve seat component (51). The sealing gasket (12) is axially located between the first valve seat component (51) and the second valve seat component (52). The first valve seat component (51) and the second valve seat component (52) are welded to form a weld. The weld is set as a non-complete circumference. Several gaps are reserved between the welds. The gaps form the second flow passage (32).

8. The valve device (100) according to any one of claims 1-3, characterized in that, The valve seat component (11) includes a first valve seat component (51) and a second valve seat component (52). The first valve seat component (51) and the second valve seat component (52) are fixedly connected. The second flow passage (32) includes a first through hole (321) and a first gap (322). The first through hole (321) is located on the side wall of the first valve seat component (51). The first through hole (321) has an opening on the outer side wall of the first valve seat component (51). The first through hole (321) passes through the first valve seat component (51) in the radial direction of the valve device (100). The first gap (322) is located between the first valve seat component (51) and the second valve seat component (52). The first gap (322) can communicate with the first through hole (321).

9. The valve device (100) according to claim 4, 5, or 8, characterized in that, The first through hole (321) is circular in shape.

10. The valve device (100) according to claim 4, 5, 8, or 9, characterized in that, There are two first through holes (321), and the first through holes (321) are arranged symmetrically.

11. The valve device (100) according to any one of claims 1-10, characterized in that, The lower end face of the sealing gasket (12) and the stepped portion (115) have a first flow passage (31), which can connect the space or gap formed between the sealing gasket (12) and the valve seat component (11).

12. The valve device (100) according to any one of claims 1-11, characterized in that, The valve device (100) further includes a lead screw (15) and a rotor assembly (14), the rotor assembly (14) being able to drive the lead screw (15) to move; the lead screw (15) is connected to the valve needle (2), the lead screw (15) being able to make the valve needle (2) move relative to the valve port (121); or, the valve device (100) further includes a second valve needle (21), the lead screw (15) being connected to the second valve needle (21), the valve needle (2) having a second valve port (22), the lead screw (15) being able to make the second valve needle (21) move relative to the valve port (121), the second valve needle (21) being able to drive the valve needle (2) to move relative to the valve port (121).

13. The valve device (100) according to claim 12, characterized in that, The sealing gasket (12) is made of non-metallic material, and the valve needle (2) abuts against the upper end face of the sealing gasket (12), or the valve needle (2) abuts against the inner side face of the sealing gasket (12).

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