Valve device

Abstract

The valve device comprises a valve element assembly and a first stop part, the valve device is provided with a valve cavity and a valve port, the valve port communicates with the valve cavity, and at least part of the valve element assembly is located in the valve cavity; the valve device further comprises a second stop part, the first stop part and the valve element assembly can move relative to the valve port, and the second stop part is fixed relative to the wall forming the valve port. When the valve device is in a lower stop state, the first stop part abuts against the second stop part, and the valve device is provided with a small-flow channel communicated with the valve cavity. The valve device can be controlled through a simple mechanical mechanism to keep preset small-opening-degree work, and stable operation of a heat management system under low load is facilitated.

Description

Technical Field

[0001] This application relates to the technical field of fluid control, and particularly to a valve device. Background Art

[0002] In related technologies, a valve device is used for regulating the refrigerant flow rate in an air-conditioning system. The valve device includes a rotor assembly, a valve core assembly, and a valve seat. The valve seat has a valve port. The rotor assembly can drive the valve core assembly to move relative to the valve port to adjust the flow rate of the working medium passing through the valve port. According to different application scenarios, a high-power evaporator or condenser is required to operate at a relatively stable and small flow rate. Summary of the Invention

[0003] The purpose of this application is to provide a valve device, propose a valve device with a simple structure, and further maintain a large-diameter valve device in a preset small opening degree, which is beneficial to the stable operation of the thermal management system under low-load conditions.

[0004] To achieve the above purpose, an embodiment of this application adopts the following technical solutions:

[0005] A valve device, the valve device includes a valve core assembly and a first stop portion. The valve device has a valve cavity and a valve port, and the valve port is communicated with the valve cavity. At least a part of the valve core assembly is located in the valve cavity. The valve device further includes a second stop portion. The first stop portion and the valve core assembly can move relative to the valve port, and the second stop portion is fixed relative to the wall forming the valve port. When the valve device is in the lower stop state, the first stop portion abuts against the second stop portion. The valve device has a small flow channel, and the small flow channel is communicated with the valve cavity.

[0006] In an embodiment provided by this application, the valve device includes a valve core assembly, a first stop portion, and a second stop portion. The valve device has a valve cavity and a valve port, and the valve port is communicated with the valve cavity. At least a part of the valve core assembly is located in the valve cavity. The first stop portion and the valve core assembly can move relative to the valve port, and the second stop portion is fixed relative to the wall forming the valve port. When the valve core assembly moves towards the valve port to the first stop state, a small flow channel is formed between the valve core assembly and the wall forming the valve port. It can control a large-diameter valve device to stably maintain a preset small opening degree through a simple mechanical mechanism, and can ensure the stable operation of the thermal management system under low-load conditions. Brief Description of the Drawings

[0007] Figure 1 is the overall structural schematic diagram of this application;

[0008] Figure 2 is Figure 1 the sectional view along the A-A direction of

[0009] Figure 3 isFigure 2 Enlarged schematic view at position B;

[0010] Figure 4 It is a partially enlarged structural schematic view of the connecting plate and the first stop portion of the first embodiment of the valve device;

[0011] Figure 5 It is an enlarged structural schematic view of the nut assembly and the second stop portion of the first embodiment of the valve device;

[0012] Figure 6 It is a partially enlarged structural schematic view of the valve core and the lead screw of the valve device;

[0013] Figure 7 It is a sectional structural schematic view of the second embodiment of the valve device;

[0014] Figure 8 It is a partially sectional enlarged structural schematic view of the rotor assembly of the second embodiment of the valve device;

[0015] Figure 9 It is a partially enlarged structural schematic view of the nut assembly of the second embodiment of the valve device;

[0016] Figure 10 It is a partial flow curve diagram of the valve device of the present application near the lower stop state.

[0017] Reference numerals: 1, valve seat assembly; 2, rotor assembly; 3, valve core assembly; 4, nut assembly; 5, sleeve; 6, stop pair; 7, elastic member;

[0018] 10, valve seat; 11, connecting seat; 20, magnetic rotor; 21, connecting plate; 22, first stop portion; 23, lead screw; 31, valve needle; 40, nut seat; 41, connecting portion; 50, sleeve cavity; 60, spiral guide rail; 61, second stop portion;

[0019] 100, valve device; 101, valve cavity; 102, first channel; 103, second channel; 104, valve port; 105, small flow channel; 220, stop rod; 221, spiral ring; 222, abutting portion; 231, external thread; 310, valve needle body; 311, throttling portion; 400, guide groove; 401, internal thread. Detailed implementation manners

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0021] In conjunction with Figures 1 - 3, in an embodiment of the valve device, the valve device 100 includes a valve seat assembly 1, a rotor assembly 2, a coil assembly (not shown in the figure), a valve core assembly 3, a nut assembly 4, a sleeve 5, a first stop portion 22, and a second stop portion 61. The valve seat assembly 1 has a valve cavity 101 and a valve port 104. The valve seat assembly 1 is assembled with the sleeve 5, and the connection method is welding. At least part of the valve core assembly 3 is installed in the valve cavity 101, and at least part of the rotor assembly 2 is installed in the sleeve 5. The coil assembly (not shown in the figure) is sleeved outside the sleeve 5. The rotor assembly 2 is assembled with the valve core assembly 3. The coil assembly (not shown in the figure) is energized to control the operation of the rotor assembly 2. The rotor assembly 2 drives the valve core assembly 3 to move in the direction of the valve port 104. After the valve core assembly 3 moves to a predetermined position, the first stop portion 22 abuts against the second stop portion 61, and a small flow channel 105 is formed between the valve core assembly 3 and the wall forming the valve port 104. The ratio of the small flow channel 105 to the opening degree of the fully open state of the valve device is 0.5%-6%, which can enable the large flow valve device 100 to stably maintain a relatively small proportion of the fully open state, and can ensure the stable operation of the thermal management system under low load;

[0022] Specifically, the first stop portion 22 and the second stop portion 61 are combined to form a stop pair 6. The rotor assembly 2 can drive the first stop portion 22 and the valve core assembly 3 to move. The second stop portion 61 is fixedly arranged relative to the valve seat assembly 1. The rotor assembly 2 drives the valve core assembly 2 to move in the direction of the valve port 104. After the valve core assembly 3 moves to a predetermined position, the second stop portion 61 restricts the first stop portion 22 from continuing to move.

[0023] In this embodiment, the valve seat assembly 1 includes a valve seat 10 and a connecting seat 11. The valve seat 10 has a valve port 104. Along the axial direction of the valve seat 10, the valve seat 10, the connecting seat 11, and the sleeve 5 are connected in a fixed, limited, or integrated structure manner. In this embodiment, the valve seat 10, the connecting seat 11, and the sleeve 5 are connected by welding. The nut assembly 4 is assembled with the connecting seat 11. The nut assembly 4 includes a nut seat 40 and a connecting portion 41. The nut seat 40 and the connecting portion 41 are integrally formed. The connecting portion 41 is fixedly connected to the connecting seat 11 and is hermetically connected. The nut seat 40 is located on the side away from the valve port 104. The valve seat 10 also has a valve cavity 101, a first channel 102, and a second channel 103. The first channel 102 is communicated with the valve cavity 101, and the second channel 103 is communicated with the valve port 104 and the valve cavity 101.

[0024] The rotor assembly 2 includes a magnetic rotor 20 and a lead screw 23. The magnetic rotor 20 can drive the lead screw 23 to rotate. The rotor assembly 2 further includes a connecting plate 21. The magnetic rotor 20 is fixed to, limited by, or integrated with the connecting plate 21. The connecting plate 21 is fixed to, limited by, or integrated with the lead screw 23. In this embodiment, the connecting plate 21 is fixedly welded to the lead screw 23. The nut seat 40 has an internal thread 401, and the lead screw 23 has an external thread 231. The nut seat 40 is threadedly connected to the lead screw 23, and the external thread 23 meshes with the internal thread 401. The lead screw 23 is fixed to, limited by, or integrated with the valve core assembly 3.

[0025] The valve core assembly 3 includes a valve needle 31. The valve needle 31 is fixed to, limited by, or integrated with the lead screw 23. In this embodiment, the valve needle 31 and the lead screw 23 are integrated.

[0026] Furthermore, the valve needle 31 includes a valve needle body 310 and a throttling portion 311. The valve needle 31 includes a valve needle body 310 and a throttling portion 311. The valve needle body 310 is fixedly connected to, limited by, or integrated with the throttling portion 311. Along the axial direction of the valve needle 31, the throttling portion 311 is closer to the valve port 104 than the valve needle body 310. The outer diameter of the valve needle body 310 is greater than the inner diameter of the valve port 104. Of course, in other embodiments, the outer diameter of the valve needle body 310 may also be smaller than the inner diameter of the valve port 104.

[0027] Along the axial direction of the valve core assembly 3, the nut assembly 4 has a guide groove 400. The guide groove 400 has an opening facing the valve port 104. At least part of the valve needle 31 is in sliding fit with the wall forming the guide groove 400. The diameter of the valve needle 31 is greater than the diameter of the lead screw 23. An elastic member 7 is provided in the guide groove 400. One end of the elastic member 7 abuts against the bottom wall forming the guide groove 400, and the other end of the elastic member 7 abuts against the end portion of the valve needle 31 away from the valve port 104. In this embodiment, the elastic member 7 is a spring. The spring is sleeved on the outside of at least part of the lead screw 23. One end of the spring abuts against the bottom wall forming the guide groove 400, and the other end of the spring 7 abuts against the end portion of the valve needle 31 away from the valve port 104. Of course, in other embodiments, the elastic member 7 can be a reed or other elastic elements.

[0028] The sleeve 5 includes a sleeve cavity 50. The sleeve cavity 50 communicates with the valve cavity 101. The connecting seat 11 is fixedly connected to the sleeve 5 by welding, and the welding joint between the two is sealed. The valve seat 10 is fixedly connected to the connecting seat 11 by welding, and the welding joint between the two is sealed.

[0029] Combined Figures 2 to 6, the first embodiment of the stop pair 6. Along the axial direction of the spool assembly 3, the first stop portion 22 protrudes downward relative to the connecting plate 21. The first stop portion 22 is disposed on the lower side of the connecting plate 21. The first stop portion 22 is fixed to, limited by, or integrated with the connecting plate 21. In this embodiment, the first stop portion 22 and the connecting plate 21 are of an integrated structure;

[0030] Along the axial direction of the spool assembly 3, the second stop portion 61 is located on the lower side of the connecting plate 21. The second stop portion 61 protrudes upward relative to at least a part of the nut assembly 4. The second stop portion 61 is located on the moving path of the first stop portion 22. The second stop portion 61 is fixed to, limited by, or integrated with the nut assembly 4. Specifically, the second stop portion 61 is fixed to, limited by, or integrated with the nut seat 40. In this embodiment, the second stop portion 61 and the nut seat 40 are of an integrated structure. Specifically, the second stop portion 61 is made of PPS or PEEK material.

[0031] Combined with Figure 10 , when the coil assembly (not shown in the figure) is energized, the coil assembly (not shown in the figure) drives the magnetic rotor 20 to rotate. The magnetic rotor 20 drives the connecting plate 21, the first stop portion 22, and the lead screw 23 to rotate. During the meshing rotation of the external thread 231 and the internal thread 401, along the axial direction of the lead screw 23, the lead screw 23 moves relative to the nut assembly 4 in the direction close to the valve port 104. The first stop portion 22 gradually moves in the direction close to the valve port 104 during the rotation until the first stop portion 22 abuts against the second stop portion 61 during the rotation. Due to the action of the second stop portion 61, the first stop portion 22 cannot continue to rotate. At this time, the gap between the valve needle 31 and the wall forming the valve port 104 forms a small flow channel 105. Specifically, a small flow channel 105 is formed between the throttling portion 311 and the wall forming the valve port 104. At this time, when the magnetic rotor 20 rotates in the reverse direction, the flow curve of the valve device 100 near the lower stop state is as Figure 10 shown.

[0032] During the processing and assembly process, in order to facilitate adjusting the flow rate of the small flow channel 105 to meet the usage requirements, during the assembly process, the lead screw 23 is fixedly connected to the valve needle 31. First, the lead screw 23 and the nut assembly 4 are assembled. By controlling the rotation of the lead screw 23, the lead screw 23 drives the valve needle 31 to rotate. Along the axial direction of the valve needle 31, the valve needle 31 moves in the direction close to the valve port 104. By testing the flow rate from the first channel 102 to the second channel 103, when the flow rate value reaches the required value, stop rotating the lead screw 23, connect the connecting plate 21 and the lead screw 23, and along the previous rotation direction of the lead screw 23, make the first stop portion 22 abut against the second stop portion 61, and fix the connecting plate 21 and the lead screw 23 by welding.

[0033] According to different application scenarios, it is required that the evaporator or condenser works in a relatively stable small flow rate state;

[0034] In one application scenario, in a multi-loop refrigeration system, the compressor is lubricated by the oil in other loops. During the use of the valve device, the valve port 104 should be closed as much as possible;

[0035] In a single-loop refrigeration system, during the use of the valve device, the compressor is lubricated by the oil in the refrigerant. Completely closing the valve port will cause the compressor to lack oil and even burn out. Therefore, an opening needs to be left at the valve port 104 for the lubricating oil to flow and lubricate the compressor;

[0036] Specifically, the opening of the valve port of the valve device 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 the additional refrigeration capacity.

[0037] In another application scenario, in the thermal management system where the valve device is located, large-load refrigeration and heating are required to quickly change the temperature of a certain space. After reaching the specified temperature, it is necessary to maintain the temperature of a certain space stable. Due to unstable environmental conditions and very low environmental loads, occasional refrigeration and occasional heating are required. At this time, the flow rate of the refrigerant required by the thermal management system is small, that is, the required opening of the valve device is small, and the proportion of the opening range in the flow curve of the valve device is small (the proportion of the opening range in the flow curve of the valve device is hereinafter referred to as the required opening proportion). Due to the machining errors, assembly errors, and control errors of the components of the valve device itself, when the valve device controls the movement of the valve core group 3, there will be a certain stroke deviation between the actual position of the valve core assembly and the predetermined position in the execution control program. The proportion of this stroke deviation range in the total stroke of the valve device is large (the proportion of the stroke deviation range in the total stroke of the valve device is hereinafter referred to as the stroke deviation proportion). When the stroke deviation proportion is greater than the required opening proportion, the valve device cannot be accurately adjusted to the required opening range, and the closer the required opening value is to zero, the greater this impact is, and it cannot meet the requirements of the application scenario.

[0038] In a specific application scenario, in spring and autumn, the environmental conditions are not stable enough, the required refrigeration and heating range is large, and for areas that are more sensitive to temperature changes, such as the temperature control of aircraft cabins and large carriages, the maximum flow rate required during the operation of the thermal management system is 250 g / s, and the minimum flow rate required is 2.5 - 7.5 g / s, and the corresponding required opening proportion is 1% - 3%; there are areas where the required refrigeration and heating range is large and are more sensitive to temperature changes, such as cold fresh transportation carriages, and the minimum required opening proportion is 0.5%.

[0039] It should be noted that the above application scenarios are only used to illustrate the present invention and do not limit the application scenarios described in the present invention.

[0040] Combined with Figure 10, A specific embodiment of the valve device. The local flow curve near the lower stop state of the valve device is as shown in Figure 10 . The abscissa is the number of steps taken by the magnetic rotor 2, and the ordinate is the flow rate of the valve device, with the unit of g / s. The full-open flow rate of the valve device is 250 g / s (not shown in the figure). During the process of the valve core assembly 3 of the valve device switching from the lower stop state to the upper stop state, the number of steps taken by the magnetic rotor is 545 steps (not shown in the figure). The valve opening tolerance of the valve device is ±15 steps, and the tolerance ratio of the corresponding step error is ±2.75%.

[0041] Since the tolerance ratio of the step error of the valve device is ±2.75%, compared with the above typical scenario, in the cold fresh transportation carriage, the minimum required opening ratio is 0.5%. When the maximum required opening ratio is greater than 6%, the valve device can reach the required opening range through program control. Therefore, the ratio range of the small flow channel 105 of the present application to the opening of the fully open state of the valve device 100 is 0.5% - 6%.

[0042] Combined with Figures 6 to 9 , the second embodiment of the stop pair 6. The first stop portion 22 includes a stop rod 220 and a spiral ring 221. The stop rod 220 is fixed to, limited to, or integrated with the connecting plate 21. In this embodiment, the stop rod 220 is connected to the connecting plate 21 by welding. Along the radial direction of the nut seat 40, one end of the spiral ring 221 away from the valve port 104 extends outward to form an abutting portion 222. The abutting portion 222 is located on the rotation path of the stop rod 220. Of course, in other embodiments, the brake rod 220 and the spiral ring 221 can be connected in a fixed manner;

[0043] The stop pair 6 further includes a spiral guide rail 60. The spiral guide rail 60 is fixed to, limited to, or integrated with the nut assembly 4. At least part of the spiral guide rail 60 is located on the outer ring of the nut assembly 4. Specifically, the spiral guide rail 60 is located on the outer ring of the nut seat 40. One end of the spiral guide rail 60 close to the valve port 104 extends in the direction close to the valve port 104 to form a second stop portion 61. The spiral ring 221 can rotate along the spiral guide rail 60. Of course, in other embodiments, a second stop portion 61 is formed by extending radially outward along the nut seat 40. The second stop portion 61 is located on the track of the spiral guide rail 60. During the rotation of the spiral ring 221, along the axial direction of the nut assembly 4, the spiral ring 221 moves away from or close to the valve port 104. During the rotation of the spiral ring 221 and the movement in the direction close to the valve port 104, when one end of the spiral ring 221 close to the valve port 104 abuts against the second stop portion 61, the spiral ring 221 cannot continue to rotate. At this time, a small flow channel 105 is formed between the valve needle 31 and the wall forming the valve port 104. Specifically, a small flow channel 105 is formed between the throttling portion 311 and the wall forming the valve port 104.

[0044] Combined withFigure 10 When the coil assembly (not shown in the figure) is energized, the coil assembly (not shown in the figure) drives the magnetic rotor 20 to rotate. The magnetic rotor 20 drives the connecting plate 21, the lead screw 23, the stop rod 22 and the spiral ring 221 to rotate. During the meshing rotation of the external thread 231 and the internal thread 401, along the axial direction of the lead screw 23, the lead screw 23 moves relative to the nut assembly 4 in the direction approaching the valve port 104. During the rotation of the spiral ring 221, it gradually moves in the direction approaching the valve port 104 until one end of the spiral ring 221 close to the valve port 104 abuts against the second stop portion 61 during rotation. Due to the action of the second stop portion 61, the spiral ring 221 cannot continue to rotate. At this time, a small flow channel 105 is formed between the valve needle 31 and the wall forming the valve port 104. Specifically, the interval between the throttling portion 311 and the wall forming the valve port 104 forms the small flow channel 105. At this time, when the magnetic rotor 20 rotates in the reverse direction, the flow curve of the valve device 100 is as follows Figure 10 as shown.

[0045] In one embodiment, when the spiral ring 221 is separated from the stop rod 220, during the processing and assembly process, in order to facilitate adjusting the flow rate of the small flow channel 105 to meet the usage requirements, the lead screw 23 is fixedly connected or integrally formed with the valve needle 31. First, the lead screw 23 and the nut assembly 4 are assembled, and the lead screw 23, the connecting plate 21 and the magnetic rotor 20 are assembled. By controlling the rotation of the lead screw 23, the lead screw 23 drives the valve needle 31 to rotate. Along the axial direction of the valve needle 31, the valve needle 31 moves in the direction approaching the valve port 104. By testing the flow rate from the first channel 102 to the second channel 103, when the flow rate value reaches the required value, stop rotating the lead screw 23, connect the connecting plate 21 and the stop rod 22, and along the previous rotation direction of the lead screw 23, make one end of the spiral ring 221 close to the valve port 104 abut against the second stop portion 61, and control the stop rod 220 to abut against the spiral ring 221, and fix the connecting plate 21 and the stop rod 220 by welding;

[0046] In another embodiment, when the spiral ring 221 is fixedly connected, limitedly connected or integrally structured with the stop rod 220, the difference in the processing and assembly process between this embodiment and the embodiment where the spiral ring 221 is separated from the stop rod 220 is as follows:

[0047] After testing that the flow rate from the first channel 102 to the second channel 103 reaches the required value, stop rotating the lead screw 23, connect the connecting plate 21 and the stop rod 22, and along the previous rotation direction of the lead screw 23, make one end of the spiral ring 221 close to the valve port 104 abut against the second stop portion 61, and fix the connecting plate 21 and the stop rod 220 by welding.

[0048] It should be noted that the above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Although the present specification has described the present invention in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the art can still modify the present invention or make equivalent substitutions, and all technical solutions and their 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, characterized in that: The valve device comprises a valve core assembly (3) and a first stopper (22), the valve device having a valve cavity (101) and a valve port (104), the valve port (104) being in communication with the valve cavity (101), and at least a portion of the valve core assembly (3) being located in the valve cavity (101); The valve device further comprises a second stopper (61), the first stopper (22) and the valve core assembly (3) are movable relative to the valve port (104), and the second stopper (61) is fixed relative to a wall forming the valve port (104); When the valve device is in a lower stop state, the first stop portion (22) abuts against the second stop portion (61), and the valve device has a small flow channel (105), and the small flow channel (105) is connected to the valve chamber (101).

2. The valve device according to claim 1, characterized in that The corresponding opening degree of the small flow channel (105) is 0.5%-6% of the fully open state of the valve device.

3. The valve device according to claim 1 or 2, characterized in that: The valve device further comprises a rotor assembly (2), the valve core assembly (3) being connected to the rotor assembly (2), the rotor assembly (2) being capable of driving the valve core assembly (3) and the first stop portion (22) to move, and the second stop portion (61) being located on a movement path of the first stop portion (22) in rotation.

4. The valve device according to claim 3, characterized in that The valve core assembly (3) comprises a screw rod portion (32) and a valve needle (31), wherein the screw rod portion (32) and the valve needle (31) are fixed, limited or are an integrated structure; The rotor assembly (2) is capable of driving the screw rod portion (32) and the first stop portion (22) to rotate. The valve device further comprises a nut assembly (4). The nut assembly (4) is fixed relative to a wall forming the valve port (104). The screw rod portion (32) is threadedly connected to the nut assembly (4). The second stop portion (61) is fixed to the nut assembly (4) or is an integral structure. The second stop portion (61) is located on a rotation path of the first stop portion (22).

5. The valve device according to claim 4, characterized in that The rotor assembly (2) comprises a magnetic rotor (20) and a connecting plate (21); the connecting plate (21) is fixedly or positionally connected to the screw rod portion (32); the connecting plate (21) is fixedly or positionally connected to the magnetic rotor (20); the connecting plate (21) is fixedly or positionally connected to the first stop portion (22) or is an integrated structure; and the nut assembly (4) is fixedly or positionally connected to the second stop portion (61) or is an integrated structure.

6. The valve device according to claim 5, characterized in that The first stop portion (22) protrudes relative to the connecting plate (21) in a direction approaching the nut assembly (4); the first stop portion (22) and the connecting plate (21) are an integral structure; along the radial direction of the nut assembly (4), the second stop portion (61) extends in a direction away from the nut assembly (4); the second stop portion (61) is located on the rotation path of the first stop portion (22); the second stop portion (61) and the nut assembly (4) are an integral structure.

7. The valve device according to claim 4, characterized in that The nut assembly (4) further comprises a spiral guide rail (60), the spiral guide rail (60) being fixedly or positionally connected to the nut assembly (4) or being an integral structure, at least a portion of the spiral guide rail (60) being located on an outer ring of the nut assembly (4), and the second stopper (61) being arranged on a side of the spiral guide rail (60) close to the valve port (104); The rotor assembly (2) comprises a magnetic rotor (20) and a connecting plate (21); the first stop portion (22) comprises a stop rod (220) and a spiral ring (221); the connecting plate (21) and the stop rod (220) are fixed, position-limitedly connected or are an integral structure; the stop rod (220) can drive the spiral ring (221) to rotate along the spiral guide rail (60); when the valve device is in a lower stop state, one end of the spiral ring (221) close to the valve port (104) abuts against the second stop portion (61).

8. The valve device according to any one of claims 4 to 7, characterized in that: The nut assembly (4) has a guide groove (400), and the wall forming the guide groove (400) is slidably matched with the valve needle (30). An elastic member (7) is provided between the valve needle (30) and the wall forming the guide groove (400). Along the axial direction of the valve needle (30), the first end of the elastic member (7) abuts against the valve needle (30), and the second end of the elastic member (7) abuts against the wall forming the guide groove (400).

9. The valve device according to any one of claims 4 to 8, characterized in that: The valve needle (31) includes a valve needle body (310) and a throttling portion (311); the valve needle body (310) and the throttling portion (311) are fixedly, positionally connected or are an integrated structure; along the axial direction of the valve needle (31), the throttling portion (311) is closer to the valve port (104) than the valve needle body (310); and the outer diameter of the valve needle body (310) is greater than the inner diameter of the valve port (104).

10. The valve device according to any one of claims 1 to 9, characterized in that: The valve device also includes a valve seat assembly (1) and a sleeve (5), the sleeve (5) includes a sleeve cavity (50), at least a portion of the valve core assembly (3) is located inside the sleeve cavity (50), the sleeve cavity (50) is communicated with the valve cavity (101), and the sleeve (5) is fixedly connected to the valve seat assembly (1).

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