A rotor assembly and a valve core assembly

Abstract

The present invention discloses a rotor assembly and a valve core assembly. The rotor assembly includes a nut seat, a magnetic rotor body, a spiral guide rail and a slip ring. The nut seat has a seat body and a shaft body along the axial direction. The outer surface of the seat body is provided with a slot. The spiral guide rail is arranged on the shaft body. The spiral guide rail is provided with a first stop structure toward one end of the nut seat. The first stop structure is at least partially arranged in the slot. The slip ring is sleeved on the shaft body. The slip ring is matched with the spiral guide rail. The slip ring can rotate along the spiral guide rail relative to the shaft body. The first stop structure forms a limit to the slip ring in one rotation direction. The magnetic rotor body is sleeved on the outer periphery of the spiral guide rail. One end of the magnetic rotor body is fixedly connected to the seat body. The magnetic rotor body cooperates with the slot to form a limit to the first stop structure. The valve core assembly includes a rotor assembly and a valve stem arranged in the shaft cavity of the nut seat. The valve stem is fixedly connected to the slip ring. The present application is simple and reliable, easy to assemble, and the spiral guide rail is stably installed and the assembly efficiency is high, and the production cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic expansion valves, and in particular to a rotor assembly and a valve core assembly of an electronic expansion valve. Background Art

[0002] The electronic expansion valve is a throttle valve used in refrigeration systems. It controls the refrigerant flow by adjusting the valve opening. The electronic expansion valve is mainly composed of three parts: coil, valve body and valve core (changed according to customer needs). The control system sends a signal, and the PCBA board in the expansion valve receives the signal to control the coil excitation. After the coil is excited, it drives the magnetic rotor in the valve body to rotate forward or reverse, and the motion is transmitted through the rotor thread pair, driving the valve core to move axially, thereby changing the valve opening.

[0003] In order to ensure that the valve core moves axially within a predetermined range, a stop mechanism must be set in the expansion valve. The stop mechanism commonly used in market applications is mainly composed of a spiral guide rail, a slip ring and a nut seat. The spiral guide rail cooperates with the shaft of the nut seat, and the lower part of the spiral guide rail is clamped with the nut seat to achieve the limit of the spiral guide rail; the spiral guide rail is provided with upper and lower stop parts, and the slip ring rotates and moves axially on the spiral guide rail under the drive of the magnetic rotor through the corresponding structure, and then the displacement is limited by the upper and lower stop parts, ensuring that the valve core moves axially within a predetermined range. However, the current electronic expansion valve, its spiral guide rail is simply clamped on the nut seat, the limit of the spiral guide rail is insufficient, and the spiral guide rail is prone to loosening during use, which will affect the performance of the electronic expansion valve.

[0004] Therefore, in view of the above-mentioned technical problems, it is necessary to make new innovations. Summary of the invention

[0005] The purpose of the present invention is to at least solve the deficiencies in the prior art, so a rotor assembly and a valve core assembly are proposed, and the specific scheme is as follows:

[0006] A rotor assembly comprises a nut seat, a magnetic rotor body, a spiral guide rail and a slip ring, the nut seat is in the shape of a hollow shaft, the nut seat has a seat body and a shaft body along the axial direction, a slot is arranged on the outer surface of the seat body, the spiral guide rail is arranged around the shaft body, a first stop structure is arranged at one end of the spiral guide rail facing the nut seat, the first stop structure is at least partially arranged in the slot, the slip ring is sleeved on the shaft body, the slip ring is matched with the spiral guide rail, the slip ring can rotate along the spiral guide rail relative to the shaft body, the first stop structure forms a limit for the slip ring in one rotation direction, the magnetic rotor body is in the shape of a hollow tube, the magnetic rotor body is sleeved on the periphery of the spiral guide rail, one end of the magnetic rotor body is fixedly connected to the seat body, and the magnetic rotor body cooperates with the slot to form a limit for the first stop structure.

[0007] Furthermore, the slot is in the shape of an elongated strip and extends on the outer surface of the seat body portion, and the slot forms an elongated, extended opening on the outer surface of the seat body portion, and the slot has at least one bending portion. After one end of the magnetic rotor body is fixedly connected to the seat body portion, at least a portion of the opening of the slot is closed to form an elongated accommodating space with at least one bending portion, and the first stop structure has a bending portion matching the slot and is located in the accommodating space.

[0008] Furthermore, a bayonet is provided at the end of the magnetic rotor body corresponding to the bayonet slot, and the first stop structure extends from the bayonet slot into the bayonet slot.

[0009] Furthermore, one end of the spiral guide rail corresponding to the seat body is bent outward in its axial direction to form the first stop structure, and the end of the first stop structure is bent outward in the radial direction of the spiral guide rail to form a fixing portion, and the fixing portion extends into the bayonet.

[0010] Furthermore, the first stop structure is formed into an L-shaped structure, and the slot is formed into an L-shaped slot;

[0011] When one end of the magnetic rotor body is fixedly connected to the seat body, the magnetic rotor body closes a portion of the opening of the L-shaped slot, and the magnetic rotor body cooperates with the L-shaped slot to form an L-shaped accommodating space, and the L-shaped accommodating space is closed outside the head and tail ends of the L-shaped structure, and the L-shaped accommodating space forms a limit for the first stop structure.

[0012] Furthermore, one end of the spiral guide rail away from the seat body is bent outwardly in its axial direction to form a second stop structure, and the second stop structure limits the slip ring in another rotation direction.

[0013] Furthermore, a positioning structure is provided between the magnetic rotor body and the seat body.

[0014] Furthermore, the magnetic rotor body includes a magnetic steel body and a connecting piece. The magnetic steel body is in a hollow tubular shape. The magnetic steel body is sleeved on the periphery of the spiral guide rail. One end of the magnetic steel body is fixedly connected to the seat body through the connecting piece.

[0015] A valve core assembly comprises a valve stem and the above-mentioned rotor assembly, wherein the valve stem is rotatably arranged in the axial cavity of the nut seat, and the valve stem is threadably matched with the nut seat.

[0016] Furthermore, it also includes a connecting rod, one end of which is fixedly connected to the valve stem, and the other end of which can abut against the slip ring.

[0017] Compared with the prior art, the rotor assembly and valve core assembly of the present application have at least one or more of the following

[0018] Beneficial effects:

[0019] The rotor assembly and valve core assembly of the present application are simple and reliable, reduce the installation process, and reduce the difficulty of assembly, so that the installation of the spiral guide rail can be completed conveniently and quickly during the assembly process; its magnetic rotor body is designed to be fixedly connected with the nut seat, and fully utilizes the fixing method between the magnetic rotor body and the nut seat. While playing the role of fixing the magnetic rotor body, it also limits the spiral guide rail, which can effectively improve the installation stability and assembly efficiency of the spiral guide rail and greatly reduce the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the three-dimensional structure of a rotor assembly provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of a half-section structure of a rotor assembly provided in an embodiment of the present application;

[0022] Figure 3 A schematic diagram of the three-dimensional structure of a nut seat provided in an embodiment of the present application;

[0023] Figure 4 A schematic diagram of the side structure of the spiral guide rail provided in an embodiment of the present application;

[0024] Figure 5 A schematic diagram of the side structure of a magnetic rotor body provided in an embodiment of the present application;

[0025] Figure 6 A schematic diagram of the assembly process of a rotor assembly provided in an embodiment of the present application;

[0026] Figure 7A schematic diagram of the half-section structure of the valve core assembly provided in an embodiment of the present application.

[0027] Among them, 1-nut seat, 11-seat body, 12-shaft body, 13-slot, 14-first step surface, 15-first positioning structure, 16-second positioning structure, 17-shaft cavity, 18-second step surface, 2-magnetic rotor body, 21-magnetic steel body, 22-connecting piece, 221-bayonet, 3-spiral guide rail, 31-first stop structure, 311-fixing part, 32-second stop structure, 4-slip ring, 41-stop structure, 5-valve stem, 6-connecting rod, 61-plug hole. DETAILED DESCRIPTION

[0028] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0029] Example

[0030] This embodiment provides a valve core assembly, which includes a valve stem 5 and a rotor assembly.

[0031] The rotor assembly comprises a nut seat 1, a magnetic rotor body 2, a spiral guide rail 3 and a slip ring 4. Figure 1 and Figure 2 The nut seat 1 is in the shape of a hollow shaft, and has a seat body 11 and an axis body 12 along the axial direction, and a slot 13 is provided on the seat body 11. Figure 3 The figure schematically shows a preferred solution, in which the outer diameter of the seat body 11 is greater than the outer diameter of the shaft body 12, and a first step surface 14 is formed between the seat body 11 and the shaft body 12. The slot 13 passes through the first step surface 14 and the circumferential surface of the seat body 11.

[0032] The spiral guide rail 3 is disposed around the shaft body 12, and a first stop structure 31 is disposed at one end of the spiral guide rail 3 facing the nut seat 1, and the first stop structure 31 is at least partially disposed in the clamping groove 13. The magnetic rotor body 2 is in a hollow tubular shape and is sleeved on the periphery of the spiral guide rail 3. One end of the magnetic rotor body 2 is fixedly connected to the seat body 11, and the magnetic rotor body 2 cooperates with the clamping groove 13 to limit the first stop structure 31.

[0033] like Figure 4As shown in the figure, a preferred solution is schematically shown, wherein the spiral guide rail 3 is spiral-shaped and sleeved on the shaft body portion 12. One end of the spiral guide rail 3 corresponding to the seat body portion 11 is bent outwardly in its axial direction to form the first stop structure 31. Preferably, the axial direction of the first stop structure 31 has a certain angle with the axial direction of the spiral guide rail 3. Correspondingly, the slot 13 is preferably configured as an inclined slot, that is, the inner wall of the slot 13 is preferably designed as an inclined surface matching the setting angle of the first stop structure 31.

[0034] like Figure 4 As shown in the figure, a preferred solution is schematically shown, the end of the first stop structure 31 is bent outwardly in the radial direction of the spiral guide rail 3 to form a fixing portion 311, that is, the first stop structure 31 forms an L-shaped structure. Accordingly, it is preferred that a second step surface 18 is provided on the seat body 11, the slot 13 is formed on the outer surface of the seat body 11, and its slot body extends on the outer surface of the seat body 11 and is bent at the second step surface 18 to form an L-shaped slot, as shown in FIG. Figure 3 As shown. The L-shaped slot is defined as extending from one end of the "L" shape of the L-shaped structure, turning, and then extending to the other end as the length extension direction (i.e. the extension direction between the beginning and the end of the "L" shape), and the surroundings around the length extension direction of the L-shaped slot are the circumferential direction. The circumferential side of the L-shaped slot is not closed, that is, the L-shaped slot forms a long, extended opening on the outer surface of the seat body 11, so as to facilitate the installation of the spiral guide rail 3, that is, to facilitate the placement of the first stop structure 31 and the fixing portion 311 into the slot 13.

[0035] When one end of the magnetic rotor body 2 is fixedly connected to the seat body 11, the magnetic rotor body 2 cooperates with the L-shaped slot to form an L-shaped accommodation space, and the L-shaped accommodation space is closed outside the first and last ends of the L-shaped structure. Therefore, the L-shaped accommodation space forms a circumferential limit (i.e., it limits its relative movement to the nut seat 1 in the rotation direction of the spiral guide 3) and a radial limit (i.e., it limits its movement along the radial direction of the spiral guide 3) for the axially extending portion of the first stop structure 31 (i.e., the portion outside its fixing portion 311). The L-shaped accommodation space forms an axial limit (i.e., it limits its relative movement to the nut seat 1 in the rotation direction of the spiral guide 3) and a circumferential limit (i.e., it limits its relative movement to the nut seat 1 in the rotation direction of the spiral guide 3) for the radially extending portion of the first stop structure 31 (i.e., the fixing portion 311). It should be pointed out that the limit here should be understood in a broad sense, and the first stop structure 31 may be allowed to move slightly in the L-shaped accommodation space, but the limit here is sufficient to limit the first stop structure 31 from leaving the L-shaped accommodation space.

[0036] In a further embodiment, a bayonet 221 is provided at the end of the magnetic rotor body 2 corresponding to the slot 13. When the magnetic rotor body 2 is fixedly connected to the seat body 11, the bayonet 221 cooperates with the seat body 11 to form a hole-like space that is closed in the axial and circumferential directions. The hole-like space is connected to one end of the L-shaped accommodating space, which further extends the shorter section of the L-shaped accommodating space. The length of the fixing portion 311 is designed so that its end portion preferably extends out of the slot 13 from the opening of the circumferential surface of the nut seat 1. Then, when the magnetic rotor body 2 is fixedly connected to the seat body 11, the end portion of the fixing portion 311 is located in the bayonet 221, that is, the fixing portion 311 extends from the slot 13 to the bayonet 221. Figure 2 As shown, the bayonet 221 forms an axial limit (i.e., limits its movement along the axial direction of the spiral guide rail 3) and a circumferential limit (i.e., limits its movement relative to the nut seat 1 in the rotation direction of the spiral guide rail 3) on the end of the fixing portion 311, thereby realizing the axial limit and circumferential limit of the fixing portion 311, i.e., the spiral guide rail 3, by the magnetic rotor body 2. Of course, the limit here should also be understood in a broad sense, and the end of the fixing portion 311 can be allowed to move slightly in the bayonet 211, but the limit here is sufficient to limit the end of the fixing portion 311 from escaping from the bayonet 211. Due to the miniaturization and compact design of the structure, this results in a shorter section of the L-shaped accommodation space in the radial direction of the nut seat 1, which may have an adverse effect on the limit of the fixing portion 311 placed therein. By further extending the length of the shorter section of the L-shaped accommodation space, the limit effect on the fixing portion 311 can be improved. Under the joint restriction of the snap-in 211 of the magnetic rotor body 2 and the L-shaped slot, the spiral guide rail 3 cannot escape from the L-shaped accommodation space formed by the snap-in 211 and the L-shaped slot no matter in which direction it vibrates / shakes, so it can be stably set on the nut seat 1.

[0037] In one embodiment, a positioning structure is preferably provided between the magnetic rotor body 2 and the seat body 11, such as Figure 3A preferred solution schematically shown in the figure is that a first positioning structure 15 in the shape of an annular protrusion and a second positioning structure 16 in the shape of a protrusion are provided on the circumferential surface of the seat body 11, and the second positioning structure 16 is located on the side of the first positioning structure 15 facing the shaft body 12. One end of the magnetic rotor body 2 is preferably sleeved on the seat body 11, and the first positioning structure 15 abuts against the end of the magnetic rotor body 2 to form an axial positioning of the magnetic rotor body 2, while the bayonet 221 cooperates with the first positioning structure 15 to form a hole-like structure closed in the axial and circumferential directions, and a positioning groove matching the second positioning structure 16 is provided at the inner wall of the magnetic rotor body 2 corresponding to the second positioning structure 16, and the magnetic rotor body 2 is circumferentially positioned under the cooperation of the two, and the L-shaped accommodation space is formed at the same time. Under the dual positioning in the axial and circumferential directions, it can be ensured that the magnetic rotor body 2 can be accurately installed on the nut seat 1 during assembly. The magnetic rotor body 2 and the nut seat 1 may be fixed in various ways, such as gluing, fastening with fasteners such as screws, interference fit or welding, etc., preferably, laser welding is used for fixing.

[0038] In one embodiment, the magnetic rotor body 2 preferably includes a magnetic steel body 21 and a connecting member 22. Figure 2 and Figure 5 As schematically shown in the figure, the magnetic steel body 21 is in the shape of a hollow tube, the connecting piece 22 is in the shape of a ring, the magnetic steel body 21 and the connecting piece 22 are coaxially arranged, and one end of the magnetic steel body 21 is sleeved on the connecting piece 22 and fixedly connected to the connecting piece 22. The fixing method of the magnetic steel body 21 and the connecting piece 22 can be in various forms, such as gluing or interference press fitting, etc., and it is preferred to use interference press fitting to achieve fixed connection between the two. The magnetic steel body 21 is sleeved on the periphery of the spiral guide rail 3, and one end of the magnetic steel body 21 is fixedly connected to the seat body 11 through the connecting piece 22.

[0039] In a further embodiment, the slip ring 4 is sleeved on the shaft body 12, the slip ring 4 is matched with the spiral guide rail 3, the slip ring 4 can rotate along the spiral guide rail 3 relative to the shaft body 12, and the first stop structure 31 limits the slip ring 4 in one rotation direction. In one embodiment, the end of the spiral guide rail 3 away from the seat body 11 is preferably bent outward in its axial direction to form a second stop structure 32, such as Figure 4 The axial direction of the first stop structure 31 is preferably consistent with the axial direction of the spiral guide rail 3. The second stop structure 32 limits the slip ring 4 in another rotation direction.

[0040] In a further embodiment, a stop structure 41 is provided in the circumferential direction of the slip ring 4. Figure 2 and Figure 6 As shown, the figure schematically shows a preferred solution, the slip ring 4 is also spiral, and during assembly, the spiral guide rail 3 and the slip ring 4 are first assembled alternately, and then the assembly of the two is sleeved on the shaft body 12 of the nut seat 1, and finally the magnetic rotor body 2 is fixedly connected to the nut seat 1. One end of the slip ring 4 is preferably bent and extended outward in the radial direction to form the stop structure 41.

[0041] The valve stem 5 is rotatably disposed in the shaft cavity 17 of the nut seat 1. Figure 7 As shown, a connecting rod 6 is preferably further provided, one end of which is fixedly connected to the valve stem 5, and the other end of which can abut against the slip ring 4. The fixed connection between the connecting rod 6 and the valve stem 5 can be in various forms, for example, a plug hole 61 matching the valve stem 5 is provided at one end of the connecting rod 6, and one end of the valve stem 5 is plugged and fixedly connected to the plug hole 61. The fixing method is preferably welding.

[0042] In the specific implementation, a bearing can be sleeved on the seat body 11 of the nut seat 1 so as to be rotatably connected with the valve body of the electronic expansion valve. When the coil arranged on the periphery of the magnetic rotor body 2 is energized, the magnetic rotor body 2 will be driven to drive the nut seat 1 and the spiral guide rail 3 to rotate forward or reverse. Since the rotor assembly is restricted from axial movement, the valve stem 5 is threadedly matched with the nut seat 1 in the shaft cavity 17, and the valve stem 5 is restricted from rotating. Therefore, when the magnetic rotor body 2 rotates and drives the nut seat 1 to rotate, the valve stem 5 will move axially, thereby changing the size of the valve opening. The spiral guide rail 3 will also rotate with the nut seat 1, thereby driving the slip ring 4 to rotate until its stop structure 41 is located on one side of the connecting rod 6 and abuts against it. Since the connecting rod 6 is fixedly connected to the valve stem 5 and cannot rotate, the slip ring 4 will not be able to rotate along the spiral guide rail 3 after abutting against the connecting rod 6, but will move along the axial direction of the spiral guide rail 3 when the spiral guide rail 3 rotates until the slip ring 4 abuts against the first stop structure 31 or the second stop structure 32 on the spiral guide rail 3 (i.e., the slip ring 4 is limited). As a result, the spiral guide rail 3 and the magnetic rotor body 2 cannot continue to rotate, thereby achieving axial movement of the valve stem 5 within a predetermined range.

[0043] Compared with the prior art, the rotor assembly and valve core assembly of the present application have at least one or more of the following

[0044] Beneficial effects:

[0045] The rotor assembly and valve core assembly of the present application are simple and reliable, reduce the installation process, and reduce the difficulty of assembly, so that the installation of the spiral guide rail can be completed conveniently and quickly during the assembly process; its magnetic rotor body is designed to be fixedly connected with the nut seat, and fully utilizes the fixing method between the magnetic rotor body and the nut seat. While playing the role of fixing the magnetic rotor body, it also limits the spiral guide rail, which can effectively improve the installation stability and assembly efficiency of the spiral guide rail and greatly reduce the production cost.

[0046] In this document, the terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than those listed and may also include additional elements not expressly listed.

[0047] In this document, the directional words such as front, back, top, and bottom are defined by the positions of the components in the drawings and the positions of the components relative to each other, and are only for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in this application.

[0048] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotor assembly, It is characterized in that The invention comprises a nut seat (1), a magnetic rotor body (2), a spiral guide rail (3) and a slip ring (4); the nut seat (1) is in the shape of a hollow shaft; the nut seat (1) has a seat body portion (11) and a shaft body portion (12) along the axial direction; a retaining groove (13) is arranged on the outer surface of the seat body portion (11); the outer diameter of the seat body portion is greater than the outer diameter of the shaft body portion; the spiral guide rail (3) is arranged around the shaft body portion (12); a first stop structure (31) is arranged at one end of the spiral guide rail (3) facing the nut seat (1); the first stop structure (31) is at least partially arranged in the retaining groove (13); the slip ring (4) is provided with a plurality of screw terminals and a plurality of screw terminals. 4) is sleeved on the shaft body (12), the slip ring (4) is matched with the spiral guide rail (3), the slip ring (4) can rotate along the spiral guide rail (3) relative to the shaft body (12), the first stop structure (31) forms a limit for the slip ring (4) in one rotation direction, the magnetic rotor body (2) is in a hollow tubular shape, the magnetic rotor body (2) is sleeved on the periphery of the spiral guide rail (3), one end of the magnetic rotor body (2) is fixedly connected to the seat body (11), the magnetic rotor body (2) and the clamping groove (13) cooperate to form a limit for the first stop structure (31), The slot (13) is in the shape of an elongated strip and extends on the outer surface of the seat body (11); the slot (13) forms an elongated, extended opening on the outer surface of the seat body (11); the slot (13) has at least one bent portion; one end of the magnetic rotor body (2) is fixedly connected to the seat body (11) to close at least a portion of the opening of the slot (13), thereby forming an elongated accommodation space having at least one bent portion; the first stop structure (31) has a bent portion matching the slot (13) and is located in the accommodation space.

2. The rotor assembly according to claim 1, It is characterized in that A snap-in (221) is provided at the end of the magnetic rotor body (2) corresponding to the snap-in slot (13), and the first stop structure (31) extends from the snap-in slot (13) into the snap-in (221).

3. The rotor assembly according to claim 2, It is characterized in that One end of the spiral guide rail (3) corresponding to the seat body (11) is bent outwardly in its axial direction to form the first stop structure (31), and the end of the first stop structure (31) is bent outwardly in the radial direction of the spiral guide rail (3) to form a fixing portion (311), and the fixing portion (311) extends into the bayonet (221).

4. The rotor assembly according to claim 1, It is characterized in that The first stop structure (31) is formed into an L-shaped structure, and the clamping groove (13) is formed into an L-shaped clamping groove; When one end of the magnetic rotor body (2) is fixedly connected to the seat body (11), the magnetic rotor body (2) closes a portion of the opening of the L-shaped slot, and the magnetic rotor body (2) cooperates with the L-shaped slot to form an L-shaped accommodation space, which is closed outside the first and second ends of the L-shaped structure, and the L-shaped accommodation space forms a limit for the first stop structure (31).

5. The rotor assembly according to claim 1, It is characterized in that One end of the spiral guide rail (3) away from the seat body (11) is bent outwardly in its axial direction to form a second stop structure (32), and the second stop structure (32) limits the slip ring (4) in another rotation direction.

6. The rotor assembly according to claim 1, It is characterized in that A positioning structure is provided between the magnetic rotor body (2) and the seat body (11).

7. The rotor assembly according to claim 1, It is characterized in that The magnetic rotor body (2) comprises a magnetic steel body (21) and a connecting piece (22); the magnetic steel body (21) is in the shape of a hollow tube; the magnetic steel body (21) is sleeved on the periphery of the spiral guide rail (3); one end of the magnetic steel body (21) is fixedly connected to the seat body (11) via the connecting piece (22).

8. A valve core assembly, It is characterized in that It comprises a valve stem (5) and a rotor assembly as described in any one of claims 1 to 7, wherein the valve stem (5) is rotatably arranged in an axial cavity (17) of the nut seat (1), and the valve stem (5) is threadedly matched with the nut seat (1).

9. The valve core assembly according to claim 8, It is characterized in that It also includes a connecting rod (6), one end of which is fixedly connected to the valve stem (5), and the other end of which can abut against the slip ring (4).

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