A throttle valve axial sealing structure with longer maintenance cycles

Abstract

This utility model discloses an axial sealing structure for a throttle valve with a longer maintenance cycle, relating to the technical field of sealing structures. This utility model aims to solve the problems of difficulty in replacing the sealing ring in the axial sealing groove structure of the fixed structure and the decrease in sealing performance after the O-ring wears out. This utility model includes...

Description

Technical Field

[0001] This utility model relates to the technical field of sealing structures, specifically an axial sealing structure for a throttle valve with a longer maintenance cycle. Background Technology

[0002] Traditional MPCVD equipment typically uses a method of slotting the inner wall of the central shaft mating hole and installing an O-ring for the throttle valve's front-end sealing structure. However, this structure has the following problems: due to the small hole diameter, it is difficult to install and remove the O-ring; the O-ring is prone to wear after prolonged use, resulting in a decrease in sealing performance and requiring frequent replacement. Utility Model Content

[0003] To address the aforementioned problems, specifically those raised in the background section, this utility model proposes an axial sealing structure for a throttle valve with a longer maintenance cycle. The structure includes a valve body, a valve port / plate, a central shaft, valve plate fixing screws, and an axial sealing mechanism. The valve port is located on the valve body. The central shaft is installed in the valve port via a polymer collar. The valve plate is installed on the central shaft via valve plate fixing screws. The bottom end of the central shaft extends into the valve body, and a collar and an axial sealing mechanism are respectively fitted onto the bottom end of the central shaft. Bearings are symmetrically arranged on the upper and lower sides of the collar. A motor mounting plate is installed below the valve body via mounting bolts. The motor mounting plate has a connecting hole in which a coupling is installed. The bottom end of the central shaft is connected to the coupling via a central shaft key. The axial sealing mechanism includes a compression spring, an O-ring washer, and an O-ring sequentially fitted onto the central shaft. The compression spring is located on the side closer to the bearing. A bearing limiting mechanism is located on the side of the bearing furthest from the collar, with the upper bearing limiting mechanism positioned between the compression spring and the bearing.

[0004] A further feature of this invention is that the bearing limiting mechanism includes a retaining ring and a pair of flat washers, with the pair of flat washers disposed at both ends of the retaining ring.

[0005] A further feature of this invention is that a conical washer is provided between the retaining spring and the flat washer, wherein the conical surface and the flat surface of the conical washer point towards the retaining spring and the flat washer, respectively.

[0006] A further feature of this invention is that an auxiliary mounting hole is provided on one side of the valve body, and the auxiliary mounting hole points towards the collar.

[0007] The beneficial technical effects of this utility model are as follows: This solution solves the problem of difficult O-ring disassembly and assembly in traditional structures, improving maintenance efficiency. The novel axial sealing mechanism can compensate for O-ring wear, extending the maintenance cycle. The axial sealing mechanism adopts an axial installation method, facilitating disassembly and maintenance. The tapered gasket ensures the fit and pressure of the retaining ring, improving bearing stability. The auxiliary mounting holes make the disassembly and assembly process more convenient. Attached Figure Description

[0008] Figure 1 A schematic diagram of the overall structure of this solution is shown.

[0009] Figure 2 A schematic diagram of the left-side structure of this scheme is shown.

[0010] Figure 3 An enlarged view of the axial sealing mechanism is shown.

[0011] Figure 4 A schematic diagram of the bottom end of the motor mounting plate is shown.

[0012] The attached diagram includes the following reference numerals: 1. Valve body; 2. Valve plate; 3. Valve port; 4. Polymer collar; 5. Central shaft; 6. Bearing; 7. Collar; 8. Snap ring; 9. Compression spring; 10. Conical washer; 11. Flat washer; 12. O-ring washer; 13. O-ring; 14. Coupling; 15. Central shaft key; 16. Motor mounting plate; 17. Mounting bolt for mounting plate; 18. Valve plate fixing screw; 19. Auxiliary mounting hole. Detailed Implementation

[0013] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0014] This utility model proposes an axial sealing structure for a throttle valve with a longer maintenance cycle. The new axial sealing mechanism replaces the traditional single sealing ring. The O-ring 13 is pressed against by the compression spring 9 and the O-ring 12. This not only helps to fix the O-ring 13 to prevent positional displacement from affecting the seal when the central shaft 5 moves frequently, but also pushes the O-ring to compensate when the O-ring 13 is worn, thus extending the maintenance cycle. At the same time, the axial sealing mechanism adopts an axial installation method, which also facilitates disassembly and maintenance.

[0015] By setting snap rings 8 and flat washers 11 on both sides of the bearing 6, the bearing 6 is radially supported by the force of snap rings 8, avoiding axial expansion caused by high temperature that could jam the bearing. The axial mounting hole of the bearing 6 is deliberately extended, and the bearing is fixed by the pressure of snap rings 8, thus restricting axial movement.

[0016] By setting a tapered washer 10 between the retaining ring 8 and the flat washer 11, with the tapered surface pointing towards the retaining ring 8 and the flat surface fitting against the flat washer 11, the fit of the retaining ring 8 is ensured to guarantee the pressure.

[0017] An auxiliary mounting hole is made on the side of the valve body 1, pointing to the collar 7. When disassembling or installing the axial sealing mechanism, the position and angle of the components can be adjusted by passing a tool through the auxiliary mounting hole.

[0018] Although the present invention has been described with reference to preferred embodiments, various modifications can be made to it and components can be replaced with equivalents without departing from the scope of the present invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0019] In the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0022] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. An axial sealing structure for a throttle valve with a longer maintenance cycle, comprising a valve body (1), a valve port (3), a valve plate (2), a central shaft (5), valve plate fixing screws (18), and an axial sealing mechanism, wherein the valve port (3) is disposed on the valve body (1), the central shaft (5) is mounted in the valve port (3) via a polymer collar (4), the valve plate (2) is mounted on the central shaft (5) via valve plate fixing screws (18), and the bottom end of the central shaft (5) extends into the valve body (1). Furthermore, a shaft collar (7) and an axial sealing mechanism are respectively sleeved at the bottom end of the central shaft (5). Bearings (6) are symmetrically arranged on the upper and lower sides of the shaft collar (7). A motor fixing plate (16) is installed below the valve body (1) by fixing plate mounting bolts (17). A connecting hole is opened in the motor fixing plate (16), and a coupling (14) is installed in the connecting hole. The bottom end of the central shaft (5) is connected to the coupling (14) by a central shaft key (15). The feature is that: The axial sealing mechanism includes a compression spring (9), an O-ring washer (12) and an O-ring (13) sequentially sleeved on the central shaft (5). The compression spring (9) is located on the side close to the bearing (6). The bearing (6) is provided with a bearing limiting mechanism on the side away from the shaft collar (7). The bearing limiting mechanism located above is located between the compression spring (9) and the bearing (6).

2. The axial sealing structure for a throttle valve with a longer maintenance cycle according to claim 1, characterized in that: The bearing limiting mechanism includes a retaining ring (8) and a pair of flat washers (11), with the pair of flat washers (11) disposed at both ends of the retaining ring (8).

3. The axial sealing structure of a throttle valve with a longer maintenance cycle according to claim 2, characterized in that: A conical washer (10) is provided between the retaining ring (8) and the flat washer (11), with the conical surface and the flat surface of the conical washer (10) pointing towards the retaining ring (8) and the flat washer (11), respectively.

4. The axial sealing structure for a throttle valve with a longer maintenance cycle according to claim 1, characterized in that: An auxiliary mounting hole is provided on one side of the valve body (1), and the auxiliary mounting hole points to the collar (7).

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