Valve device

Abstract

The invention discloses a valve device which comprises a valve element and a valve seat, the valve seat is provided with a valve cavity, the valve element is located in the valve cavity, the valve seat is provided with a fluid inlet and a fluid outlet, the valve element can open or close the fluid outlet, the valve device comprises a guiding piece, at least part of the guiding piece is located in the valve cavity, and the guiding piece is located in the valve cavity. The guide part is fixed to the valve seat and comprises a first outer wall, the valve element is provided with a first inner wall, at least part of the first outer wall is matched with at least part of the first inner wall, at least part of the first inner wall wraps at least part of the first outer wall, and the valve element is provided with a second inner wall. The first inner wall can axially move relative to the first outer wall. According to the valve device, the first outer wall of the guide part is matched with the first inner wall of the valve element, so that the valve element can axially move along the guide part, deviation of the valve element can be effectively reduced, abrasion of the valve element and the valve seat in the moving process is reduced, and the sealing performance of the valve device is improved.

Description

Technical Field

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

[0002] A valve is a device that uses a movable part to open, close, or partially block one or more openings or channels, so that a liquid flow, an air flow, or other gas flows or a large amount of loose materials can flow out, be blocked, or be regulated.

[0003] In the related art, during the process of the valve core opening or closing the outlet of the valve device, it is easy to deviate, thereby causing wear with the inner wall of the valve seat and affecting the sealing performance of the valve device. Summary of the Invention

[0004] The purpose of the present invention is to at least solve the problems in the background art and propose a valve device.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A valve device includes a valve core and a valve seat. The valve seat has a valve cavity, at least part of the valve core is located in the valve cavity. The valve seat has a fluid inlet and a fluid outlet, and the valve core can open or close the fluid outlet. The valve device includes a guide member, at least part of the guide member is located in the valve cavity, the guide member is fixed to the valve seat. The guide member includes a first outer wall, the valve core has a first inner wall, at least part of the first outer wall cooperates with at least part of the first inner wall, at least part of the first inner wall covers at least part of the first outer wall, and the first inner wall can axially displace relative to the first outer wall.

[0007] In the valve device of the above technical solution, the first outer wall of the guide member cooperates with the first inner wall of the valve core, so that the valve core can axially displace along the guide member, thereby effectively reducing the deviation of the valve core, reducing the wear between the valve core and the valve seat during the movement, and improving the sealing performance of the valve device.

[0008] The features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. Brief Description of the Drawings

[0009] The following further describes the present invention in conjunction with the drawings and specific embodiments:

[0010] Figure 1 It is a schematic cross-sectional structure diagram of a valve device of an embodiment;

[0011] Figure 2 It is a schematic cross-sectional structure diagram showing the structure of a valve core and a guide member of an embodiment;

[0012] Figure 3 Exploded structural schematic diagram of the valve core and nut structure of an embodiment;

[0013] Figure 4 Structural schematic diagram of a guide member of an embodiment;

[0014] Figure 5 Cross-sectional structural schematic diagram of a valve device of another embodiment;

[0015] Figure 6 Cross-sectional structural schematic diagram of a valve device of another embodiment;

[0016] Figure 7 Cross-sectional structural schematic diagram of a valve device of another embodiment;

[0017] Figure 8 Cross-sectional structural schematic diagram of a valve device of another embodiment;

[0018] Figure 9 Cross-sectional structural schematic diagram showing the valve core and guide member structure of an embodiment;

[0019] Figure 10 Structural schematic diagram of a guide member of an embodiment;

[0020] Figure 11 Structural schematic diagram of a guide member of another embodiment;

[0021] Figure 12 Structural schematic diagram of a valve core from one perspective of an embodiment;

[0022] Figure 13 Structural schematic diagram of a valve seat of an embodiment;

[0023] Figure 14 Cross-sectional structural schematic diagram of a valve seat of an embodiment;

[0024] Figure 15 Structural schematic diagram of a sealing ring of an embodiment.

[0025] Reference numerals:

[0026] 1. Valve seat, 101. Valve cavity, 102. Limit groove, 103. Bottom end face, 2. Valve core, 200. First inner wall, 201. Orifice inner wall, 202. Baffle, 203. Cavity inner wall, 204. First cavity, 205. Bottom end wall, 206. Second orifice, 210. Second body part, 211. Cover part, 2101. First orifice, 2102. Balance hole, 2104. Cylindrical body, 3. Guide member, 300. First outer wall, 301. Outer wall body, 302. Guide shaft, 303. Connecting rib, 304. Annular seat, 306. Connecting shaft, 307. Cylindrical body, 3070. Annular wall, 3071. Bottom wall, 308. L-shaped guide rib, 3080. Outer wall part, 4. Fluid inlet, 5. Fluid outlet, 6. Core shaft, 7. Nut, 700. First body part, 701. Limit ear, 8. Sealing ring, 9. Sealing ring, 901. Sealing face, 902. Annular groove, 10. Buffer spring. Detailed implementation mode

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Other embodiments obtained by those skilled in the art without creative efforts all belong to the protection scope of the present invention. In addition, it should be understood that the following words indicating orientation or position relationships such as "upper", "lower", "left", "right", "longitudinal", "transverse", "inner", "outer", "vertical", "horizontal", "top", "bottom", etc. are only based on the orientation or position relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention.

[0028] As Figures 1 - 15 shown, a valve device in an embodiment includes a valve core 2 and a valve seat 1. The valve seat 1 has a valve cavity 101. At least part of the valve core 2 is located in the valve cavity 101. The valve seat 1 has a fluid inlet 4 and a fluid outlet 5. The valve core 2 can open or close the fluid outlet 5. The valve device includes a guide member 3. At least part of the guide member 3 is located in the valve cavity 101. The guide member 3 is fixed to the valve seat 1. The guide member 3 includes a first outer wall 300. The valve core 2 has a first inner wall 200. At least part of the first outer wall 300 cooperates with at least part of the first inner wall 200. At least part of the first inner wall 200 covers at least part of the first outer wall 300. The first inner wall 200 can axially displace relative to the first outer wall 300.

[0029] The valve core 2 of the valve device in the related art can open or close the fluid through axial displacement. During the axial displacement of the valve core 2, the valve core 2 is prone to radial offset, thus causing wear with the inner wall of the valve seat 1. In this application, at least part of the first outer wall 300 of the guide member 3 cooperates with at least part of the first inner wall 200 of the valve core 2, so that the valve core 2 can perform axial displacement along the guide member 3. Furthermore, under the guiding action of the guide member 3, the offset of the valve core 2 is reduced, the wear between the valve core 2 and the valve seat 1 is reduced, and the sealing performance of the valve device of this application is improved.

[0030] At least part of the first outer wall 300 cooperating with at least part of the first inner wall 200 means that at least part of the first outer wall 300 and at least part of the first inner wall 200 can have relative displacement, but the gap between the two is very small, much smaller than the offset amount that the valve core 2 may have in the related art when there is no guide member 3. The valve core 2 can axially displace along the guide member 3. In fact, due to the influence of processing accuracy and the need for relative displacement between the valve core 2 and the guide member 3, there will still be a microscopic offset margin for the valve core 2, but this offset is extremely small and can be ignored. Therefore, it can still be considered that the valve core 2 axially displaces along the guide member 3.

[0031] In one embodiment, the first inner wall 200 is an annular wall, the first outer wall 300 is an annular wall, at least part of the first inner wall 200 and at least part of the first outer wall 300 are sleeved and cooperate, and at least part of the first inner wall 200 is located outside at least part of the first outer wall 300.

[0032] In one embodiment, as Figures 1 - 4 、 Figure 12 shown, the guide member 3 includes a guide shaft 302. The guide shaft 302 is fixed to the valve seat 1. The valve core 2 has a first cavity 204. At least part of the guide shaft 302 is located in the first cavity 204. The valve core 2 has a bottom wall portion 205. The bottom wall portion 205 has a through first opening 2101. At least part of the guide shaft 302 is located in the first opening 2101. At least part of the outer wall body 301 of the guide shaft 302 is the first outer wall 300, and at least part of the inner wall 201 corresponding to the first opening 2101 is the first inner wall 200.

[0033] The interior of the valve core 2 is hollow to form a first cavity 204. Components such as the buffer spring 10 of the valve device can be located in the first cavity 204. The lower end of the valve core 2 has a bottom wall portion 205, and the valve core 2 is integrally in the shape of a cylinder with the bottom wall portion 205. The guide shaft 302 can be fixed to the valve seat 1 through the connecting rib 303. A part of the guide shaft 302 passes through the first port 2101 and is located in the first cavity 204, and the guide shaft 302 cooperates with the first port 2101. The bottom wall portion 205 has a certain thickness. The first port 2101 penetrates through the bottom wall portion 205, and the first port 2101 communicates with the first cavity 204. The cooperation between the guide shaft 302 and the first port 2101 enables the valve core 2 to axially displace along the guide member 3, thereby reducing the radial offset of the valve core 2 and reducing the wear between the valve core 2 and the valve seat 1.

[0034] In one embodiment, as Figure 6 、 Figure 7 shown, the guide shaft 302 is fixed to the valve seat 1 through the connecting rib 303. The connecting rib 303 is located in the outlet channel corresponding to the fluid outlet 5. One end of the connecting rib 303 is fixed to the inner side wall of the valve seat 1 by welding or other means, and the other end of the connecting rib 303 is fixed to the guide shaft 302 by welding or other means. In other embodiments, the connecting rib 303 can also be integrally formed with the guide shaft 302.

[0035] In another embodiment, as Figure 4 、 Figure 5 shown, the guide seat includes an annular seat 304 and a connecting rib 303. One end of the connecting rib 303 is fixed to the annular seat 304, and the other end of the connecting rib 303 is fixed to the guide shaft 302. The annular seat 304 is located in the outlet channel corresponding to the fluid outlet 5 and is fixed to the inner side wall of the valve seat 1.

[0036] Further, the annular seat 304, the connecting rib 303, and the guide shaft 302 are sequentially fixed by welding. The guide shaft 302 is located within the space surrounded by the annular seat 304. The number of connecting ribs 303 is at least two, specifically three or four, preferably three. The three connecting ribs 303 evenly divide the space surrounded by the annular seat 304, that is, the distance between any two adjacent connecting ribs 303 is equal. The space between two adjacent connecting ribs 303 serves as the flow space for the fluid. The three connecting ribs 303 have sufficient strength to support the guide shaft 302 and do not affect the flow of the fluid. The annular seat 304 is located in the outlet channel corresponding to the fluid outlet 5, and the annular seat 304 and the inner side wall of the valve seat 1 can be fixed by welding or other means. Of course, the annular seat 304, the connecting rib 303, and the guide shaft 302 can also be integrally formed.

[0037] In one embodiment, as Figure 1 、 Figure 14As shown, the annular seat 304 is located outside the outlet passage corresponding to the fluid outlet 5 and is fixed to the bottom end face 103 of the valve seat 1. The outer diameter of the annular seat 304 is not greater than the outer diameter of the bottom end face 103 of the valve seat 1, so that the annular seat 304 does not interfere with the installation of the valve device and the external device.

[0038] In one embodiment, as Figure 6 shown, the connecting rib 303 is horizontally arranged, that is, the connecting rib 303 is perpendicular to the guide shaft 302; in another embodiment, as Figure 7 shown, the connecting rib 303 is inclined towards the valve core 2, forming an acute angle with the guide shaft 302.

[0039] In one embodiment, the annular seat 304 can also be replaced by a disc-shaped base, and the base has at least two through ports for the fluid to flow out of the valve device.

[0040] In one embodiment, as Figure 1 、 Figure 3 、 Figure 13 、 Figure 14 shown, the valve device includes a core shaft 6 and a nut 7. The core shaft 6 is threadedly connected to the nut 7. The core shaft 6 can rotate relative to the valve seat 1. The nut 7 includes a first body portion 700 and a limiting ear portion 701. The first body portion 700 is located in the first cavity 204 of the valve core 2. The side wall of the valve core 2 has a second port 206. The limiting ear portion 701 extends out of the second port 206. The valve seat 1 has a limiting groove 102. The limiting groove 102 extends along the axial direction of the valve core 2. The limiting ear portion 701 extends into the limiting groove 102. The valve core 2 includes a second body portion 210 and a cover portion 211. The second body portion 210 and the cover portion 211 are fixed. The cover portion 211 is located above the nut 7, and a part of the second body portion 210 is located below the nut 7.

[0041] Specifically, when the core shaft 6 of the valve device rotates, and the core shaft 6 is threadedly connected to the nut 7, the nut 7 also tends to rotate. Due to the cooperation between the limiting ear portion 701 of the nut 7 and the limiting groove 102 of the valve seat 1, the nut 7 is circumferentially limited by the valve seat 1. The limiting groove 102 extends along the axial direction of the valve core 2. Therefore, under the threaded locking force of the core shaft 6 on the nut 7 and the circumferential limitation of the limiting groove 102, the nut 7 can axially displace along the limiting groove 102.

[0042] Furthermore, the cover portion 211 of the valve core 2 is located above the nut 7, and a part of the second body portion 210 is located below the nut 7, that is, the nut 7 can drive the valve core 2 to axially displace, and the axial displacement of the valve core 2 can open or close the fluid outlet 5. The structure of the rotor driving the core shaft 6 in the valve device is already relatively mature in the prior art, so it will not be elaborated in this application.

[0043] In one embodiment, as Figure 3As shown, the limiting ear part 701 is integrally formed with the first body part 700. The number of the limiting ear parts 701 is two, and the two limiting ear parts 701 are symmetrically arranged on both sides of the first body part 700. The inner side wall of the valve seat 1 has two limiting grooves 102 respectively corresponding to the limiting ear parts 701. The side wall of the valve core 2 has a penetrating second port 206. The limiting ear part 701 passes through the second port 206 and extends into the limiting groove 102. The limiting groove 102 extends along the axial direction of the valve core 2, and the width of the limiting groove 102 matches that of the limiting ear part 701, so that the limiting groove 102 circumferentially limits the nut 7, enabling the nut 7 to displace in the axial direction. In other embodiments, the number of the limiting ear parts 701 can also be one or three or more than three.

[0044] In one embodiment, as Figure 3 shown, the second body part 210 is fixedly welded to the cover body part 211. The second body part 210 has a first cavity 204, and a part of the nut 7 is located in the first cavity 204. First, the nut 7 is placed on the second body part 210 so that the limiting ear part 701 cooperates with the second port 206, and then the cover body part 211 is fixed to the second body part 210, thus completing the installation of the nut 7 and the valve core 2.

[0045] In one embodiment, as Figure 1 shown, the valve device includes a buffer spring 10. The buffer spring 10 is located in the first cavity 204 of the valve core 2, and the buffer spring 10 is located between the nut 7 and the bottom wall part 205 of the valve core 2.

[0046] The space of the second port 206 in the axial direction is larger than the width of the limiting ear part 701 in the axial direction. When the nut 7 axially displaces downward under the action of the mandrel 6, the nut 7 abuts against the buffer spring 10, and the buffer spring 10 is compressed to generate an elastic deformation force. Then, under the action of the buffer spring 10, the valve core 2 axially displaces downward, thereby closing the valve. When the valve core 2 just closes the fluid outlet 5, there is still a gap between the limiting ear part 701 and the bottom side wall corresponding to the second port 206. When the nut 7 continues to axially displace downward under the action of the mandrel 6, the nut 7 continues to compress the buffer spring 10, and the gap between the limiting ear part 701 and the bottom side wall corresponding to the second port 206 serves as the allowance for the nut 7 to continue axially displacing downward, preventing the valve core 2 from being subjected to a large axially downward force and severely wearing the wall body corresponding to the fluid outlet 5.

[0047] In one embodiment, as Figure 12As shown, the bottom wall portion 205 of the valve core 2 further has a balance hole 2102, and the balance hole 2102 communicates the fluid outlet 5 with the first chamber 204. During the process of the valve core 2 opening the fluid outlet 5, the valve core 2 is displaced upward by a small distance. At this time, the fluid inlet 4, the fluid outlet 5, and the first chamber 204 are all communicated, and the fluid will fill the valve chamber 101 of the valve device through the first chamber 204. That is, the pressures at the valve chamber 101 and the fluid outlet 5 and other places are balanced, which can facilitate the further upward displacement of the valve core 2 and reduce the force required to continue opening the valve.

[0048] In one embodiment, as Figure 9 、 Figure 10 shown, the guide member 3 includes a connecting shaft 306 and a columnar body 307. The connecting shaft 306 is fixed to the valve seat 1. The valve core 2 includes a cylindrical body 2104. The cylindrical body 2104 has a first chamber 204. At least a part of the columnar body 307 is located in the first chamber 204. The columnar body 307 cooperates with the inner wall 203 of the chamber corresponding to the first chamber 204. The annular wall 3070 of the columnar body 307 is the first outer wall 300, and the inner side wall corresponding to the first chamber 204 is the first inner wall 200.

[0049] Furthermore, at this time, the valve core 2 has a structure of a cylindrical body 2104 and does not have a bottom wall portion 205. The columnar body 307 extends into the first chamber 204. The columnar body 307 extends along the axial direction of the valve core 2. The outer side wall of the columnar body 307 cooperates with the inner wall 203 of the chamber corresponding to the first chamber 204 so that the valve core 2 can axially displace along the columnar body 307. It can be understood that the cooperation between the outer side wall of the columnar body 307 and the inner wall 203 of the chamber corresponding to the first chamber 204 means that the gap between the outer side wall of the columnar body 307 and the inner wall 203 of the chamber corresponding to the first chamber 204 is microscopically present, enabling the outer side wall of the columnar body 307 and the inner wall 203 of the chamber corresponding to the first chamber 204 to have a relative displacement in the axial direction of the valve core 2. The displacement of the valve core 2 in the radial direction is much smaller than the offset amount that the valve core 2 may occur in the related art when there is no guide member 3 and can be ignored, thereby increasing the stability of the valve core 2 in the radial direction, reducing the offset of the valve core 2, and reducing its wear with the valve seat 1.

[0050] In one embodiment, as Figure 9As shown, the valve core 2 has a baffle 202 located in the first chamber 204. The baffle 202 is fixed to the inner wall 203 of the chamber corresponding to the first chamber 204. The baffle 202 divides the first chamber 204. The guide member 3 is located below the baffle 202, and the buffer spring 10 is located between the nut 7 and the baffle 202. When the nut 7 moves downward along the axis, the buffer spring 10 is compressed. The elastic force of the buffer spring 10 acts on the baffle 202, so that the valve core 2 moves downward along the axis. When the valve core 2 just closes the fluid outlet 5, there is still a gap between the limiting ear portion 701 and the bottom side wall corresponding to the second port 206. When the nut 7 continues to move axially downward under the action of the mandrel 6, the nut 7 continues to compress the buffer spring 10, and the gap between the limiting ear portion 701 and the bottom side wall corresponding to the second port 206 serves as the allowance for the nut 7 to continue moving axially downward, preventing the valve core 2 from being subjected to a large axially downward force and severely wearing the wall body corresponding to the fluid outlet 5.

[0051] In one embodiment, as Figure 9 shown, the columnar body 307 includes an annular wall 3070 and a bottom wall 3071. The bottom wall 3071 is fixed to the connecting shaft 306. The annular wall 3070 is the first outer wall 300, and the annular wall 3070 cooperates with the inner wall 203 of the chamber corresponding to the first chamber 204.

[0052] The cooperation area between the annular wall 3070 and the inner wall 203 of the chamber corresponding to the first chamber 204 is large, making the axial displacement of the valve core 2 more stable. Further, the height of the bottom wall 3071 of the columnar body 307 in the vertical direction is higher than the lowest height of the inner side wall corresponding to the fluid inlet 4. Thus, when the valve core 2 opens the fluid outlet 5, there is sufficient space between the fluid inlet and the fluid outlet 5 as the flow space for the fluid, reducing the flow resistance of the annular wall 3070 to the fluid.

[0053] In another embodiment, as Figure 11 shown, the columnar body 307 includes at least two L-shaped guide ribs 308 that are integrally annularly distributed. The at least two L-shaped guide ribs 308 are uniformly arranged in the circumferential direction. The L-shaped guide ribs are fixed to the connecting shaft 306. The outer wall portion 3080 of the L-shaped guide rib 308 is the first outer wall 300, and the guide rib cooperates with the inner wall 203 of the chamber corresponding to the first chamber 204.

[0054] Further, the outer peripheral wall of the L-shaped guide rib 308 facing the inner wall 203 of the chamber corresponding to the first chamber 204 is arc-shaped and matches the inner wall 203 of the chamber corresponding to the first chamber 204. There is a flow space between the L-shaped guide ribs 308 that can allow the fluid to pass through, enabling the fluid to flow more smoothly from the fluid inlet to the fluid outlet 5 and reducing the flow resistance of the columnar body 307 to the fluid.

[0055] In one embodiment, as Figure 1 、 Figure 15As shown, the valve device includes a sealing ring 8. The sealing ring 8 is located between the outer side wall of the valve core 2 and the inner side wall of the valve seat 1. The sealing ring 8 is located above the fluid inlet. There is a sealing ring 9 between the sealing ring 8 and the valve core 2. The sealing ring 9 covers a part of the sealing ring 8. The sealing ring 9 has an annular sealing surface 901, and the sealing surface 901 is sealed with a part of the outer side wall of the valve core 2.

[0056] On the other side of the sealing ring 9 relative to the sealing surface 901, there is an annular groove 902, and a part of the sealing ring 8 is located in the annular groove 902, so that the sealing ring 9 wraps a part of the sealing ring 8.

[0057] The sealing ring 8 and the sealing ring 9 increase the sealing performance between the outer side wall of the valve core 2 and the inner side wall of the valve seat 1, preventing the fluid from filling the entire valve cavity 101 in the valve-closed state and increasing the pressure difference between the valve cavity 101 and the fluid outlet 5, thereby reducing the force required at the moment of valve opening.

[0058] Specifically, the inner side wall of the valve seat 1 has a mounting groove, and the sealing ring 8 and the sealing ring 9 are located in the mounting groove. The side of the sealing ring 9 facing the sealing ring 8 is concave and cooperates with the sealing ring 8 to cover a part of the sealing ring 8. The side of the sealing ring 9 facing the valve core 2 is arc-shaped and cooperates with the outer side wall of the valve core 2. Compared with the single sealing ring 8, the cooperation between the sealing ring 9 and the sealing ring 8 increases the contact area with the outer side wall of the valve core 2, and thus can increase the sealing performance between the valve core 2 and the valve seat 1.

[0059] Furthermore, the sealing ring 9 is made of plastic material, and the sealing ring 8 is made of elastic material such as rubber or silica gel. The plastic sealing ring 9 is relatively wear-resistant compared with the rubber or silica gel sealing ring 8, increasing the service life of the sealing ring 8. Further, the sealing ring 8 is located between the inner side wall of the valve seat 1 and the sealing ring 9 and abuts against the inner side wall of the valve seat 1 and the sealing ring 9 respectively, so that the sealing ring 8 has elastic deformation. The elastic deformation reset of the sealing ring 8 can make the sealing ring 9 tend to displace towards the valve core 2. In this way, even if the sealing ring 9 is worn, under the elastic force of the sealing ring 8, the sealing ring 9 and the outer side wall of the valve core 2 can still have good sealing performance.

[0060] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technical solution, concept, and design obtained by those skilled in the art in the technical scope disclosed by the present invention through equivalent replacement or change according to the technical solution and inventive concept of the present invention should be covered by the protection scope of the present invention.

Claims

1. A valve device, comprising a valve core (2) and a valve seat (1), the valve seat (1) having a valve cavity (101), at least part of the valve core (2) being located in the valve cavity (101), the valve seat (1) having a fluid inlet (4) and a fluid outlet (5), the valve core (2) being capable of opening or closing the fluid outlet (5), characterized in that, The valve device includes a guide member (3), at least a part of the guide member (3) is located in the valve cavity (101), the guide member (3) is fixed to the valve seat (1), the guide member (3) includes a first outer wall (300), the valve core (2) has a first inner wall (200), at least a part of the first outer wall (300) cooperates with at least a part of the first inner wall (200), at least a part of the first inner wall (200) covers at least a part of the first outer wall (300), and the first inner wall (200) can axially displace relative to the first outer wall (300).

2. The valve device according to claim 1, characterized in that, The guide member (3) includes a guide shaft (302), the guide shaft (302) is fixed to the valve seat (1), the valve core (2) has a first cavity (204), at least a part of the guide shaft (302) is located in the first cavity (204), the valve core (2) has a bottom wall portion (205), the bottom wall portion (205) has a through first port (2101), at least a part of the guide shaft (302) is located in the first port (2101), at least a part of the outer wall body (301) of the guide shaft (302) is the first outer wall (300), and at least a part of the port inner wall (201) corresponding to the first port (2101) is the first inner wall (200).

3. The valve device according to claim 2, characterized in that, The guide member (3) includes an annular seat (304) and a connecting rib (303), one end of the connecting rib (303) is fixed to the annular seat (304), and the other end of the connecting rib (303) is fixed to the guide shaft (302); the annular seat (304) is located in the outlet passage corresponding to the fluid outlet (5) and is fixed to the inner side wall of the valve seat (1), or the annular seat (304) is located outside the outlet passage corresponding to the fluid outlet (5) and is fixed to the bottom end face (103) of the valve seat (1); or, The guide member (3) includes a connecting rib (303), one end of the connecting rib (303) is fixed to the inner side wall of the valve seat (1), and the other end of the connecting rib (303) is fixed to the guide shaft (302).

4. The valve device according to claim 1 or 2 or 3, characterized in that, The valve device includes a mandrel (6) and a nut (7). The mandrel (6) is threadedly connected to the nut (7). The mandrel (6) is rotatable relative to the valve seat (1). The nut (7) includes a first body portion (700) and a limiting ear portion (701). The first body portion (700) is located in the first cavity (204) of the valve core (2). The side wall of the valve core (2) has a second port (206). The limiting ear portion (701) extends out of the second port (206). The valve seat (1) has a limiting groove (102). The limiting groove (102) extends along the axial direction of the valve core (2). The limiting ear portion (701) extends into the limiting groove (102). The valve core (2) includes a second body portion (210) and a cover portion (211). The second body portion (210) is fixed to the cover portion (211). The cover portion (211) is located above the nut (7). A part of the second body portion (210) is located below the nut (7).

5. The valve device according to claim 4, characterized in that, The valve device includes a buffer spring (10). The buffer spring (10) is located in the first cavity (204) of the valve core (2). The buffer spring (10) is located between the nut (7) and the bottom wall portion (205) of the valve core (2).

6. The valve device according to claim 1, characterized in that, The guide member (3) includes a connecting shaft (306) and a columnar body (307). The connecting shaft (306) is fixed to the valve seat (1). The valve core (2) includes a cylindrical body (2104). The cylindrical body (2104) has a first cavity (204). At least a part of the columnar body (307) is located in the first cavity (204). The columnar body (307) cooperates with the inner wall (203) of the cavity corresponding to the first cavity (204). The outer wall portion (3080) of the columnar body (307) is the first outer wall (300). The inner wall (203) of the cavity corresponding to the first cavity (204) is the first inner wall (200).

7. The valve device according to claim 6, characterized in that, The columnar body (307) includes an annular wall (3070) and a bottom wall (3071). The bottom wall (3071) is fixed to the connecting shaft (306). The annular wall (3070) is the first outer wall (300). The annular wall (3070) cooperates with the inner wall (203) of the cavity corresponding to the first cavity (204).

8. The valve device according to claim 6, characterized in that, The columnar body (307) includes at least two L-shaped guide ribs (308) that are integrally annularly distributed. At least two of the L-shaped guide ribs (308) are evenly arranged in the circumferential direction. The L-shaped guide ribs (308) are fixed to the connecting shaft (306). The outer wall portion (3080) of the L-shaped guide ribs (308) in the axial direction is the first outer wall (300). The guide ribs cooperate with the inner side wall corresponding to the first cavity (204).

9. The valve device according to claim 6 or 7 or 8, characterized in that, The valve device includes a mandrel (6) and a nut (7). The mandrel (6) is threadedly connected to the nut (7). The mandrel (6) is rotatable relative to the valve seat (1). The nut (7) includes a first body portion (700) and a limiting ear portion (701). The first body portion (700) is located in a first cavity (204) of the valve core (2). A second port (206) is provided on the side wall of the valve core (2). The limiting ear portion (701) extends out of the second port (206). The valve seat (1) has a limiting groove (102). The limiting groove (102) extends along the axial direction of the valve core (2). The limiting ear portion (701) extends into the limiting groove (102). The valve core (2) includes a second body portion (210) and a cover portion (211). The second body portion (210) is fixed to the cover portion (211). The cover portion (211) is located above the nut (7). A part of the second body portion (210) is located below the nut (7). The valve device includes a buffer spring (10). The valve core (2) has a baffle (202) located in the first cavity (204). The baffle (202) is fixed to the inner wall (203) of the cavity corresponding to the first cavity (204). The buffer spring (10) is located between the nut (7) and the baffle (202).

10. The valve device according to claim 1 or 2 or 5 or 6 or 7 or 8, characterized in that, The valve device includes a sealing ring (8). The sealing ring (8) is located between the outer side wall of the valve core (2) and the inner side wall of the valve seat (1). The sealing ring (8) is located above the fluid inlet. A sealing ring (9) is provided between the sealing ring (8) and the valve core (2). The sealing ring (9) covers at least a part of the sealing ring (8). The sealing ring (9) has an annular sealing surface portion (901). The sealing surface portion (901) is sealed with a part of the outer side wall of the valve core (2).

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