Valve device

Abstract

According to the valve device, a valve seat component of the valve device is provided with a step part, the lower end face of a sealing gasket abuts against the step part, and a first circulation channel is formed between the lower end face of the sealing gasket and the step part; the first circulation channel can be communicated with a space or a gap formed between the sealing gasket and the valve seat component, in this way, refrigerants in the space or the gap can be discharged through the first circulation channel, adverse effects caused by accumulation of the refrigerants are avoided, and the sealing reliability of the valve device is improved. According to the valve device provided by the other embodiment of the invention, the valve device is provided with the second circulation channel, the second circulation channel can communicate with the space or the gap formed between the sealing gasket and the valve seat component, in this way, the adverse effect generated by refrigerant accumulation can also be avoided, and the sealing reliability of the valve device is improved.

Description

Technical Field

[0001] The present application relates to the field of fluid control technology, and in particular to a valve device. Background Art

[0002] The valve device includes a valve needle and a valve seat component. The valve seat component has a sealing gasket. The sealing gasket has a valve port. The valve needle can cooperate with the valve port to adjust the flow state of the valve port. In the related technology, there is an installation gap or installation space between the sealing gasket and the main part of the valve seat component. Refrigerant may accumulate in the installation gap or installation space. The pressure change caused by the refrigerant state there may affect the shape or position of the sealing gasket, thereby affecting the sealing reliability of the valve device. Summary of the invention

[0003] The purpose of the present application is to provide a valve device, which is beneficial to improving the sealing reliability of the valve device.

[0004] To achieve the above purpose, one embodiment of the present application adopts the following technical solution:

[0005] A valve device, which includes a valve needle, a valve seat component and a sealing gasket, wherein the sealing gasket is installed on the valve seat component, the sealing gasket has a valve port, and the valve needle can cooperate with the sealing gasket to adjust the flow area of ​​the valve port; the valve seat component has a step portion, the lower end surface of the sealing gasket abuts against the step portion, and a first flow passage is provided between the lower end surface of the sealing gasket and the step portion, and the first flow passage can connect the space or gap formed between the sealing gasket and the valve seat component.

[0006] A valve device, comprising a valve needle, a valve seat component and a sealing gasket, wherein the sealing gasket is installed on the valve seat component, the sealing gasket has a valve port, the valve needle can cooperate with the sealing gasket to adjust the flow area of ​​the valve port; the valve seat component has a step portion, the lower end surface of the sealing gasket abuts against the step portion, and the valve device has a second flow passage, which can connect the space or gap formed between the sealing gasket and the valve seat component.

[0007] An embodiment of the present application provides a valve device, wherein a valve seat component of the valve device has a step portion, the lower end surface of the sealing gasket abuts against the step portion, and a first flow passage is provided between the lower end surface of the sealing gasket and the step portion. The first flow passage can connect to a space or gap formed between the sealing gasket and the valve seat component. With this arrangement, the refrigerant in the space or gap can be discharged through the first flow passage, thereby avoiding adverse effects caused by refrigerant accumulation and improving the sealing reliability of the valve device.

[0008] In a valve device provided in another embodiment of the present application, the valve device has a second flow passage, which can connect to the space or gap formed between the sealing gasket and the valve seat component. Such a setting can also avoid the adverse effects of refrigerant accumulation and improve the sealing reliability of the valve device. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0010] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure of the middle valve device along the AA plane;

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

[0012] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure of the middle valve component along the BB plane;

[0013] Figure 5 yes Figure 4 A schematic diagram of the enlarged structure of the middle part A;

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

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

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

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

[0018] Fig.10 is a schematic diagram of a partially enlarged structure of part A in another implementation manner of the first embodiment of the valve device;

[0019] Fig.11 It is a schematic cross-sectional structural diagram of another implementation manner of the first embodiment of the valve device. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1-11The present invention is further described with specific embodiments. In order to fully understand the present invention, many specific details are mentioned in the following detailed description. However, it should be understood by those skilled in the art that the specific components, devices and features illustrated in the drawings and described herein are merely exemplary and should not be considered as limiting.

[0021] The valve device 100 can be applied to a vehicle thermal management system or an air-conditioning system, and in particular, can be applied to a circulation system using CO2 as a refrigerant, wherein the vehicle thermal management system includes a new energy vehicle thermal management system. In the vehicle thermal management system, the valve device 100 is often used as a throttling element or a switching element.

[0022] Combination Figure 1-Figure 11 Schematically, the valve device 100 includes a valve component 1, a valve body 101 and a coil assembly 102. The valve component 1 is fixedly connected to the valve body 101, the coil assembly 102 is fixedly connected to the valve body 101, the valve body 101 has a valve body cavity 1013, and at least part of the valve component 1 is located in the valve body cavity 1013; of course, in other embodiments, the coil assembly 102 can be fixedly connected to the valve component 1, and the two can be fixedly connected to the valve body 101 after assembly. In this embodiment, the valve body 101 is a separate valve block. In other embodiments, the valve body 101 can also be part of the system, such as a part of a heat exchanger or a flow channel plate. The coil assembly 102 includes a stator assembly, the valve component 1 includes a valve seat component 11, a sleeve 13 and a rotor assembly 14, the sleeve 13 is fixedly connected to the valve seat component 11, the stator assembly 1021 is located on the outside of the sleeve 13, and the rotor assembly 14 is located on the inside of the sleeve 13. The valve component 1 further includes a screw part 15 and a nut assembly 16. The screw part 15 is fixedly connected to the rotor assembly 14. The screw part 15 and the nut assembly 16 are threadedly matched. When a predetermined current is passed through the stator assembly 1021, an excitation magnetic field can be generated to drive the rotor assembly 14 to rotate. The rotor assembly 14 can drive the screw part 15 to rotate. The screw part 15 can drive the subsequent valve needle 2 to move relative to the valve port 121.

[0023] Combination Figure 1-Figure 9In the 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 component 1 includes the valve seat component 11 and the sealing gasket 12, the sealing gasket 12 is installed on the valve seat component 11, and the sealing gasket 12 has a valve port 121. The valve component 1 also includes a screw part 15 and a rotor assembly 14. In this embodiment, the screw part 15 is fixedly connected to the rotor assembly 14, and the rotor assembly 14 can drive the screw part 15 to move. The valve component 1 includes a valve needle 2 and a second valve needle 21, the screw part 15 is connected to the second valve needle 21, the valve needle 2 has a second valve port 22, the screw part 15 can make the second valve needle 21 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, so as to adjust the flow area of ​​the valve port 121, and then adjust the refrigerant flow of the valve port 121. In the present embodiment, the screw portion 15 is connected to the second valve needle 21, and a bearing component is provided at the connection between the screw portion 15 and the second valve needle 21. The lower end portion of the screw portion 15 is formed by riveting to form a riveted portion (not shown in the figure) that supports the lower end surface of the bearing component. In the present embodiment, the valve needle 2 abuts against the upper end surface 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 surface of the sealing gasket 12 to close the valve port 121. The sealing gasket 12 is made of non-metallic material. In the present embodiment, the material of the sealing gasket 12 includes a resin material. It is not excluded that the sealing gasket 12 contains impurities or other small amounts of specific metal components. The resin material may be, for example, PTFE (Polytetrafluoroethylene), peek (polyetheretherketone), PPS (polyphenylene sulfide), etc. In other embodiments, the sealing gasket 12 may be a composite structure of a resin material and a rubber material. For example, the side of the sealing gasket 12 abutting 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 Fig.11 In other embodiments, the valve component 1 may not be provided with the second valve needle 21, and the screw portion 15 is connected to the valve needle 2. The screw portion 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, and then adjust the flow rate of the refrigerant.

[0024] Combination Figure 2-Figure 6 In the first embodiment, the valve seat component 11 has a valve seat cavity 116, at least part 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 Figure 2-Figure 6In the first embodiment, the valve seat component 11 has a plurality of channels 113, which are spaced apart along the circumference of the valve seat component 11, and the channels 113 are communicated with the valve seat cavity 116. Specifically, the channels 113 are communicated with the second valve cavity 112 of the valve seat cavity 116. The valve device 100 further includes a second sealing member 42 and a third sealing member 43. The second sealing member 42 is located at the lower side of the channel 113, and the third sealing member 43 is located at the upper side of the channel 113. The second sealing member 42 is pressed between the valve seat component 11 and the valve body 101, and the second sealing member 42 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 be used as a refrigerant inlet channel, and the second flow channel 1012 can be used 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 regulated to be on or off or to adjust the flow rate through the valve port 121.

[0026] Combination Figure 2-Figure 6 In this embodiment, the valve seat component 11 has a step portion 115, the lower end surface of the sealing gasket 12 abuts against the step portion 115, and a first flow passage 31 is provided between the lower end surface of the sealing gasket 12 and the step portion 115. The first flow passage 31 can communicate with 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 communicates with the space or gap formed between the sealing gasket 12 and the valve seat component 11, and the other end communicates with the first valve cavity 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, there may be a situation where the refrigerant accumulated in the space or gap formed between the gasket 12 and the valve seat component 11 expands due to heat, resulting in pressure, causing the position of the gasket 12 to shift or deform. At this time, the position where the valve needle 2 abuts against the gasket 12 may change, resulting in a larger leakage at the abutment point. The first flow passage 31 can avoid this situation. In other embodiments, the valve body 101 may form the valve seat component 11, the valve seat component 11 forms a step portion 115, the lower end surface of the gasket 12 abuts against the step portion 115, and the first flow passage 31 is provided between the lower end surface of the gasket 12 and the step portion 115. In this embodiment, the valve seat component 11 has a limiting portion 114, the limiting portion 114 abuts against the upper end surface of the gasket 12, and the gasket 12 is pressed between the limiting portion 114 and the step portion 115. Of course, the gasket 12 can also be installed in other ways.

[0027] Combination Figure 2-Figure 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, and the connection methods include threaded connection, crimping, etc. The valve seat component 11 can be a split structure, and the split parts are fixedly connected to form the valve seat component 11, and the valve seat component 11 can also be an integrally formed structure. An embodiment in which the valve seat component 11 is a split structure is used as an example for illustration. 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 formed separately and fixedly connected by welding, riveting, etc., and the second valve seat component 52 and the third valve seat component 53 are formed separately and fixedly connected by welding, riveting, etc.

[0028] Combination Figure 2-Figure 6 In this embodiment, the step portion 115 includes a step portion bottom surface 1151 and a step portion side surface 1152. The step portion 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 step portion bottom surface 1151. In this embodiment, the step portion 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 step portion side surface 1152 can be formed by the first step portion 115 alone, or by the second valve seat component 52 alone.

[0029] Combination Figure 2-Figure 6 In this embodiment, the valve device 100 also includes a first sealing member 41, which is located between the sealing gasket 12 and the valve seat component 11. The first sealing member 41 is pressed between the sealing gasket 12 and the valve seat component 11, and the first flow passage 31 can connect to the space or gap under or inside the first sealing member 41.

[0030] Combination Figure 2-Figure 6In a specific implementation of the present embodiment, the first sealing member 41 is located between the outer peripheral portion of the sealing gasket 12 and the inner peripheral wall of the valve seat component 11 in the radial direction of the valve device 100, the first sealing member 41 is pressed between the outer peripheral portion of the sealing gasket 12 and the inner peripheral wall of the valve seat component 11, and the first flow passage 31 can communicate with the space or gap below the first sealing member 41. In this way, the space or gap below 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 avoid the accumulation of refrigerant in the space or gap below the first sealing member 41, and avoid the accumulation of refrigerant causing the accumulated pressure to deform the sealing gasket 12 or deviate from its position, thereby affecting the sealing performance of the valve port 121 when the valve is closed, resulting in an increase in the leakage of the valve port 121. For example, the refrigerant accumulated in the space or gap below 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 seal 41 is pressed between the seal pad 12 and the side surface 1152 of the step portion, and the seal pad 12 and the side surface 1152 of the step portion are sealed by the first seal 41. In another implementation of this embodiment, the first seal 41 can also be arranged between the lower end surface of the seal pad 12 and the bottom surface 1151 of the step portion. In this case, the first flow can prevent the refrigerant from accumulating in the space or gap inside the first seal 41. Of course, the first seal 41 can satisfy both of the above-mentioned settings.

[0031] Combination Figure 2-Figure 6 In a specific implementation of the first embodiment, the step bottom surface 1151 has a first groove 311, the first groove 311 is located on the step bottom surface 1151, the first groove 311 is recessed from the step bottom surface 1151 away from the sealing gasket 12, and the first groove 311 forms a first flow passage 31, and the first flow passage 31 can communicate with the space or gap under the first sealing member 41. The number of the first groove 311 can be one or more.

[0032] Reference Fig.10 In another implementation of the first embodiment, relative to the previous implementation, in this implementation, the sealing gasket 12 has a first groove 311, the first groove 311 is located at the lower end surface of the sealing gasket 12, the first groove 311 is arranged from the lower end surface of the sealing gasket 12 away from the bottom surface 1151 of the step portion, and the first groove 311 forms a first flow passage 31, and the first flow passage 31 can connect to the space or gap under the first sealing member 41. The number of the first grooves 311 can be one or more.

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

[0034] Combination Figure 2-Figure 6 In the first embodiment, the valve device 100 further has a second circulation passage 32, and the second circulation passage 32 is connected to the space or gap on the upper side or the outer side of the first sealing member 41. The second circulation passage 32 plays the same role as the first circulation passage 31, which is to prevent the accumulation of refrigerant, resulting in the displacement or deformation of the sealing gasket 12. The first circulation passage 31 and the second circulation passage 32 work together to achieve a better effect. In this embodiment, the second circulation passage 32 is connected to the space or gap on the upper side of the first sealing member 41 for detailed introduction.

[0035] Combination Figure 2-Figure 9In one implementation of the present embodiment, 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 is fixedly connected to the second valve seat component 52. The fixed connection method includes welding and interference fit. The fixing method is further described by taking welding as an example. 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 the present implementation, the first valve seat component 51 has a first extension portion 511. The first through hole 321 is arranged on the first extension portion 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 be communicated with the first through hole 321. In this embodiment, the second valve seat component 52 has a second extension portion 521, at least part of the second extension portion 521 is located on the inner side of the first valve seat component 51. The first gap 322 is a gap between the lower end surface of the second extension portion 521 and the first valve seat component 51, and can also further include a gap between the outer side surface of the second extension portion 521 and the first valve seat component 51. The first through hole 321 can be communicated with the space or gap on the upper side of the first sealing member 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, and a weld is formed between the top surface of the first extension portion 511 and the second valve seat component 52. In this embodiment, the welding method is laser welding. In other embodiments, it can also be brazing or other welding methods.

[0036] In another implementation of the present embodiment, relative to the above-mentioned implementation, the first through hole 321 may not be provided, and the first extension portion 511 of the first valve seat component 51 is welded to the second valve seat component 52 to form a weld, and the weld is provided to be an incomplete circle, and a number of gaps are reserved between the welds. The number of gaps constitute a part of the first flow passage 31, and serve to replace the first through hole 321 in the above-mentioned implementation.

[0037] In another implementation of the present embodiment, the first flow passage 31 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 along 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 the first through hole 321 is directly connected to the space or gap on the upper side of the first sealing member 41.

[0038] In another embodiment of the present embodiment, the valve seat component 11 includes a limiting portion 114. Specifically, in the present embodiment, the second valve seat component 52 includes a limiting portion 114, and the limiting portion 114 abuts against the upper end surface of the sealing gasket 12. The lower end surface of the limiting portion 114 and / or the upper end surface of the sealing gasket 12 form a third groove (not shown in the figure). The third groove communicates with the space or gap between the outer peripheral portion of the sealing gasket 12 and the inner peripheral wall of the valve seat component 11, and the third groove forms a second flow passage 32, or the third groove forms part of the second flow passage 32. The third groove forms the second flow passage 32, which means that the second flow passage 32 mentioned in the above embodiment may not be set. The third groove forms part of the second flow passage 32, which means that on the basis of setting the second flow passage 32 in the above embodiment, the third groove is added as a part of the second flow passage 32, that is, the second flow passage 32 is composed of multiple parts. In addition, a through hole that passes through the limiting portion 114 along the axial direction of the valve device can also be provided, and the through hole is connected to the third groove or directly communicates with the space or gap on the upper side of the first sealing member 41.

[0039] In the first embodiment of the electric valve, the first sealing member 41 is provided. However, the first sealing member 41 may not be provided if the sealing performance between the sealing gasket 12 and the step portion 115 is satisfied.

[0040] The present 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. 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 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. 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 set, or the first flow passage 31 can be further set on the basis of the second flow passage 32. The specific implementation scheme can be obtained in combination with the structure in the above embodiment, and will not be described in detail here. In this embodiment, a first sealing member 41 is set. On the premise of satisfying the sealing performance between the sealing gasket 12 and the step portion 115, the first sealing member 41 may not be set.

[0041] 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 in this specification with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be modified or replaced by equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A valve device (100), characterized in that: The valve device (100) comprises 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 step portion (115); the lower end surface of the sealing gasket (12) abuts against the step portion (115); a first flow passage (31) is provided between the lower end surface of the sealing gasket (12) and the step portion (115); the first flow passage (31) 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 sealing gasket (12) has a first groove (311), the first groove (311) is located on the lower end surface of the sealing gasket (12), and the first groove (311) forms the first circulation passage (31); or, the step portion (115) includes a step portion bottom surface (1151), the step portion (115) has a first groove (311), the first groove (311) is located on the step portion bottom surface (1151), and the first groove (311) forms the first circulation passage (31); or, the sealing gasket (12) has a first groove, the first groove is located on the lower end surface of the sealing gasket (12), the step portion (115) includes a step portion bottom surface (1151), the step portion (115) has a second groove, the second groove is located on the step portion bottom surface (1151), the second groove is arranged opposite to the first groove, and the first groove and the second groove cooperate to form the first circulation passage (31).

3. The valve device (100) according to claim 1 or 2, characterized in that: The valve device (100) also includes a first sealing member (41), which is located between the sealing gasket (12) and the valve seat component (11), and the first sealing member (41) is compressed between the sealing gasket (12) and the valve seat component (11), and the first flow passage (31) can connect to the space or gap below or inside the first sealing member (41).

4. The valve device (100) according to claim 3, characterized in that The first seal (41) is located between the outer peripheral portion of the sealing gasket (12) and the inner peripheral wall of the valve seat component (11) in the radial direction of the valve device (100), and the first seal (41) is pressed between the outer peripheral portion of the sealing gasket (12) and the inner peripheral wall of the valve seat component (11), and the first flow passage (31) can connect to the space or gap on the lower side of the first seal (41).

5. The valve device (100) according to claim 3, characterized in that The valve device (100) has a second flow passage (32) which communicates with a space or gap on the upper side or the outer side of the first sealing member (41).

6. The valve device (100) according to claim 5, characterized in that 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) along the radial direction of the valve device (100), and the first through hole (321) has an opening on the outer side wall of the valve seat component (11).

7. The valve device (100) according to claim 5, 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) along 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), and the first gap 322 can be connected to the first through hole (321).

8. The valve device (100) according to any one of claims 3 to 7, characterized in that: The valve seat component (11) includes a limiting portion (114), the limiting portion (114) abuts against the upper end surface of the sealing gasket (12), and the lower end surface of the limiting portion (114) and / or the upper end surface of the sealing gasket (12) form a third groove, and the third groove connects the space or gap between the outer peripheral portion of the sealing gasket (12) and the inner peripheral wall of the valve seat component (11), and the third groove forms a second flow passage (32), or the third groove forms part of the second flow passage (32).

9. The valve device (100) according to any one of claims 4 to 7, characterized in that: The valve device (100) further comprises a screw portion (15) and a rotor assembly (14), wherein the rotor assembly (14) is capable of driving the screw portion (15) to move; the screw portion (15) is connected to the valve needle (2), and the screw portion (15) is capable of causing the valve needle (2) to move relative to the valve port (121); or, the valve device (100) further comprises a second valve needle (21), wherein the screw portion (15) is connected to the second valve needle (21), the valve needle (2) has a second valve port (22), the screw portion (15) is capable of causing the second valve needle (21) to move relative to the valve port (121), and the second valve needle (21) is capable of driving the valve needle (2) to move relative to the valve port (121).

10. The valve device (100) according to claim 8, characterized in that The sealing gasket (12) is made of a non-metallic material, and the valve needle (2) abuts against the upper end surface of the sealing gasket (12), or the valve needle (2) abuts against the inner side surface of the sealing gasket (12).

11. The valve device (100) according to claim 10, characterized in that The valve seat component (11) has a channel (113), and the valve seat component (11) also includes a valve seat cavity (116), at least a portion of the valve needle (2) is located in the valve seat cavity (116), and the channel (113) is connected to the valve seat cavity (116). The valve device (100) also includes a second sealing member (42) and a third sealing member (43), the second sealing member (42) is located on the lower side of the channel (113), and the third sealing member (43) is located on the upper side of the channel (113). The valve device (100) also includes a valve body (101), and the second sealing member (42) is pressed between the valve seat component (11) and the valve body (101). The second sealing member (42) is pressed between the valve seat component (11) and the valve body (101).

12. A valve device (100), characterized in that: The valve device (100) comprises 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 step portion (115); the lower end surface of the sealing gasket (12) abuts against the step 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).

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