Lower valve shaft structure and small-bore fixed ball valve

Abstract

The utility model relates to a kind of lower valve shaft structures, comprising: valve body, installation groove is opened in the valve body;Ball, rotating hole is opened in the ball, and the rotating hole is located the bottom of the ball;Lower valve shaft body, the lower valve shaft body includes key, convex axle, and the convex axle is fixedly connected with the key;The key is installed into the installation groove of the valve body, the convex axle is inserted into the rotating hole on the ball, and the inner diameter of the rotating hole is greater than the outer diameter of the convex axle, so that the ball can be rotated relative to the convex axle.This lower valve shaft structure is simple in structure, easy to assemble, and in view of the installation groove is provided on the valve body, the key of lower valve shaft body is installed into the installation groove, the convex axle is installed together with the ball, so that the lower valve shaft body is installed on the valve body without sealing, so that a leakage point is reduced, and the reliability of the valve is increased.

Description

Technical Field

[0001] This utility model relates to the field of valves, specifically to a lower valve shaft structure and a small-diameter fixed ball valve. Background Technology

[0002] Small-bore fixed ball valves are widely used shut-off valves (primarily for opening and closing fluids) in industrial piping systems. Their core feature is that the valve core (ball) is fixed by upper and lower rotating shafts, and the valve diameter is relatively small. The diameter of a small-bore fixed ball valve is generally less than or equal to 50 mm. This structure is compact, lightweight, and suitable for applications requiring precise flow control or where installation space is limited. In a small-bore fixed ball valve, the ball has a rotating shaft (valve stem) at both the top and bottom, firmly fixing the ball in one position; the ball itself cannot flow freely.

[0003] However, the conventional method for installing small-diameter fixed ball valves in existing technology involves drilling holes in the valve body, then installing gaskets and O-rings, and securing them with fasteners. This installation method adds an extra sealing surface, creating another potential leakage point. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a lower valve shaft structure.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a lower valve shaft structure, comprising:

[0006] The valve body has a mounting groove.

[0007] A sphere having a rotating hole located at the bottom of the sphere;

[0008] The lower valve shaft body includes a flat key and a convex shaft, the convex shaft being fixedly connected to the flat key; the flat key is installed in the mounting groove of the valve body, and the convex shaft is inserted into a rotating hole on the ball, the inner diameter of the rotating hole being larger than the outer diameter of the convex shaft, so that the ball can rotate relative to the convex shaft.

[0009] Preferably, the flat key of the lower valve shaft body is installed into the mounting groove of the valve body by interference fit, or the flat key is installed into the mounting groove and connected with screws to install the flat key together with the valve body.

[0010] Preferably, the valve body has a mounting cavity, the mounting groove is located in the mounting cavity, and the lower valve shaft body is located in the mounting cavity; the lower valve shaft body is integrally formed, thereby fixing the flat key and the convex shaft together.

[0011] This application also provides a small-diameter fixed ball valve, which, in addition to the lower valve shaft structure described above, also includes an upper valve shaft. A second mounting groove is provided on the ball, the second mounting groove being located on the upper part of the ball. The end of the upper valve shaft is inserted into the second mounting groove, and the end of the upper valve shaft is connected to the ball by screws, thereby enabling the upper valve shaft to be installed together with the ball.

[0012] Preferably, the sphere has a first water inlet and a second water inlet, which are in fluid communication; the valve body has a first opening and a second opening, which form a fluid channel; at least a portion of the sphere is located in the fluid channel; when the sphere rotates to a preset position, both the first water inlet and the second water inlet are in communication with the fluid channel, at which point the fluid channel is opened, and the first opening and the second opening are in fluid communication; when the sphere rotates to another preset position, the first water inlet and the second water inlet are not in communication with the fluid channel, at which point the fluid channel is interrupted, and the first opening and the second opening are not in fluid communication.

[0013] Preferably, it further includes a first valve cover and a second valve cover, the second valve cover being installed together with the valve body by screws, the first valve cover and the second valve cover being installed together by screws, and a rotating cavity being formed between the first valve cover, the second valve cover and the valve body, the upper valve shaft being installed in the rotating cavity, and the upper valve shaft being able to rotate in the rotating cavity.

[0014] Preferably, a limiting sleeve is installed on the upper valve shaft. The outer diameter of the limiting sleeve is larger than the maximum outer diameter of the upper valve shaft. When the upper valve shaft is installed in the rotating cavity, the limiting sleeve is located in the rotating cavity, and the outer diameter of the limiting sleeve is smaller than the inner diameter of the rotating cavity.

[0015] Preferably, it also includes a connecting cap and a rotating rod. The rotating rod is installed on the connecting cap, and the connecting cap is fixedly installed with the upper valve shaft by screws. Rotating the rotating rod causes the connecting cap to rotate, and the connecting cap causes the upper valve shaft to rotate.

[0016] Preferably, it also includes a valve core, which is installed in the mounting cavity of the valve body and is sealed and fitted together with the ball.

[0017] The beneficial effects of this application are as follows: This application provides a lower valve shaft structure, which, in addition to its simple structure and easy assembly, features a mounting groove on the valve body. The key of the lower valve shaft body is installed into the mounting groove, and the convex shaft is installed together with the ball. This eliminates the need for sealing when the lower valve shaft body is installed on the valve body, thus reducing a leakage point and increasing the reliability of the valve. This application also provides a small-diameter fixed ball valve, which includes this lower valve shaft structure. Compared to the prior art, this small-diameter fixed ball valve has fewer leakage points and better sealing performance and reliability. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of a small-diameter fixed ball valve provided by this utility model.

[0019] Figure 2 for Figure 1 The figure shows a partially enlarged view of a small-diameter fixed ball valve, with a schematic diagram of the lower valve shaft structure.

[0020] Figure 3 for Figure 1 Another enlarged view of a small-diameter fixed ball valve is shown.

[0021] Figure 4 This is a schematic diagram of the lower valve shaft body of a small-diameter fixed ball valve provided by this utility model. Detailed Implementation

[0022] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0023] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operational steps involved in each embodiment can also be rearranged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a particular embodiment and do not imply that they represent the necessary components and / or order.

[0024] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0025] Please refer to Figure 1-4 This application provides a lower valve shaft structure, which is mainly used in small-diameter fixed ball valves. The lower valve shaft structure includes:

[0026] Valve body 1, wherein a mounting groove 101 is provided on the valve body 1;

[0027] Sphere 2, on which a rotating hole 200 is provided, the rotating hole 200 being located at the bottom of sphere 2;

[0028] The lower valve shaft body 3 includes a flat key 32 and a convex shaft 31, with the convex shaft 31 fixedly connected to the flat key 32. The flat key 32 is installed in the mounting groove 101 of the valve body 1, and the convex shaft 31 is inserted into a rotating hole 200 on the ball 2, with the inner diameter of the rotating hole 200 being larger than the outer diameter of the convex shaft 31, thereby allowing the ball 2 to rotate relative to the convex shaft 31. In this application, the lower valve shaft body 3 limits the movement of the ball 2 and prevents it from shaking significantly. During rotation, the ball 2 may shake significantly from side to side due to fluid pressure or other external forces. Because a portion of the lower valve shaft body 3 is installed together with the ball 2, the amplitude of the shaking is greatly reduced.

[0029] Please refer to some embodiments of this application. Figure 1-4 The key 32 of the lower valve shaft body 3 is installed into the mounting groove 101 of the valve body 1 by interference fit, or the key 32 is installed into the mounting groove 101 and connected to the valve body 1 by screws. Of course, in this application, there are various ways to connect the key 32 of the lower valve shaft body 3 to the valve body 1, such as by bonding, welding or riveting.

[0030] Please refer to some embodiments of this application. Figure 1-4 The valve body 1 has a mounting cavity 100, the mounting groove 101 is located in the mounting cavity 100, and the lower valve shaft body 3 is located in the mounting cavity 100. The lower valve shaft body 3 is integrally formed, thereby fixing the flat key 32 and the convex shaft 31 together. Of course, in this application, the lower valve shaft body 3 can also be a split structure, for example, the flat key 32 and the convex shaft 31 can be connected together by welding, screw connection, or bolt connection.

[0031] This application also provides a small-diameter fixed ball valve, which includes the aforementioned lower valve shaft structure. The small-diameter fixed ball valve further includes an upper valve shaft 5. A second mounting groove 203 is provided on the ball 2, located at the upper part of the ball 2. The end 51 of the upper valve shaft 5 is inserted into the second mounting groove 203, and the end 51 of the upper valve shaft 5 is connected to the ball 2 by screws, thereby mounting the upper valve shaft 5 and the ball 2 together. Thus, after the upper valve shaft 5 and the ball 2 are securely mounted, rotating the upper valve shaft 5 causes the ball 2 to rotate, while the lower valve shaft body 3 remains stationary during the rotation of the ball 2.

[0032] Please refer to some embodiments of this application. Figure 1-4 The ball 2 has a first water inlet 201 and a second water inlet 202, which are in fluid communication. The valve body 1 has a first opening 102 and a second opening 103, which form a fluid channel. At least a portion of the ball 2 is located in the fluid channel. When the ball 2 rotates to a preset position, both the first water inlet 201 and the second water inlet 202 are in communication with the fluid channel, and the fluid channel is opened, with the first opening 102 and the second opening 103 in fluid communication. When the ball 2 rotates to another preset position, the first water inlet 201 and the second water inlet 202 are not in communication with the fluid channel, and the fluid channel is interrupted, with the first opening 102 and the second opening 103 not in fluid communication.

[0033] Please refer to some embodiments of this application. Figure 1-4 The small-diameter fixed ball valve also includes a first valve cover 6 and a second valve cover 7. The second valve cover 7 is installed together with the valve body 1 by screws, and the first valve cover 6 and the second valve cover 7 are also installed together by screws. A rotating cavity 8 is formed between the first valve cover 6, the second valve cover 7, and the valve body 1. The upper valve shaft 5 is installed in the rotating cavity 8 and can rotate within the rotating cavity 8. Thus, the end 203 of the upper valve shaft 5 is installed together with the ball 2. As the upper valve shaft 5 rotates in the rotating cavity 8, the upper valve shaft 5 drives the ball 2 to rotate. On the other hand, the rotating cavity 8 is connected to the mounting cavity 100 on the valve body 1.

[0034] Please refer to some embodiments of this application. Figure 1-4A limiting sleeve 52 is installed on the upper valve shaft 5. The outer diameter of the limiting sleeve 52 is larger than the maximum outer diameter of the upper valve shaft 5. When the upper valve shaft 5 is installed in the rotating cavity 8, the limiting sleeve 52 is located in the rotating cavity 8, and the outer diameter of the limiting sleeve 52 is smaller than the inner diameter of the rotating cavity 8. In this way, when the upper valve shaft rotates in the rotating cavity 8, the limiting sleeve 52 can prevent the upper valve shaft 5 from swinging significantly in the rotating cavity 8, thereby improving the stability of the upper valve shaft 5 during rotation.

[0035] Please refer to some embodiments of this application. Figure 1-4 The small-diameter fixed ball valve also includes a connecting cap 9 and a rotating rod 10. The rotating rod 10 is mounted on the connecting cap 9, and the connecting cap 9 is fixedly mounted to the upper valve shaft 5 with screws. Rotating the rotating rod 10 causes the connecting cap 9 to rotate, which in turn causes the upper valve shaft 5 to rotate. Of course, the connection between the connecting cap 9 and the upper valve shaft 5 is not limited to screw connection; they can also be connected by snap-fit, interference fit, or other methods.

[0036] Please refer to some embodiments of this application. Figure 1-4 The small-diameter fixed ball valve also includes a valve core 4, which is installed in the mounting cavity 100 of the valve body 1 and is sealed and fitted together with the ball 2.

[0037] This application provides a lower valve shaft structure. Besides its simple structure and easy assembly, this structure features a mounting groove on the valve body. The key of the lower valve shaft body is installed into the mounting groove, and the convex shaft is installed together with the ball. This eliminates the need for a seal when the lower valve shaft body is installed on the valve body, thus reducing a leakage point and increasing the valve's reliability. This application also provides a small-diameter fixed ball valve including this lower valve shaft structure. Compared to existing technologies, this small-diameter fixed ball valve has fewer leakage points and better sealing and reliability.

[0038] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A lower valve shaft structure, characterized in that, include: The valve body has a mounting groove. A sphere having a rotating hole located at the bottom of the sphere; The lower valve shaft body includes a flat key and a convex shaft, the convex shaft being fixedly connected to the flat key; the flat key is installed in the mounting groove of the valve body, and the convex shaft is inserted into a rotating hole on the ball, the inner diameter of the rotating hole being larger than the outer diameter of the convex shaft, so that the ball can rotate relative to the convex shaft.

2. The lower valve shaft structure according to claim 1, characterized in that, The key of the lower valve shaft body is installed into the mounting groove of the valve body by interference fit, or the key is installed into the mounting groove and connected with screws to install the key together with the valve body.

3. The lower valve shaft structure according to claim 1, characterized in that, The valve body has a mounting cavity, the mounting groove is located in the mounting cavity, and the lower valve shaft body is located in the mounting cavity; the lower valve shaft body is integrally formed, thereby fixing the flat key and the convex shaft together.

4. A small-diameter fixed ball valve, comprising the lower valve shaft body as described in any one of claims 1-3, characterized in that, It also includes an upper valve shaft, and the ball is provided with a second mounting groove. The second mounting groove is located on the upper part of the ball. The end of the upper valve shaft is inserted into the second mounting groove, and the end of the upper valve shaft is connected to the ball by screws, so that the upper valve shaft and the ball are installed together.

5. The small-diameter fixed ball valve according to claim 4, characterized in that, The sphere has a first water inlet and a second water inlet, which are in fluid communication with each other; the valve body has a first opening and a second opening, which form a fluid channel between the first opening and the second opening. At least a portion of the sphere is located in the fluid channel. When the sphere rotates to a preset position, both the first and second water inlets are connected to the fluid channel, at which point the fluid channel is opened, and the first opening and the second opening are in fluid communication. When the sphere rotates to another preset position, the first and second water inlets are not connected to the fluid channel, at which point the fluid channel is interrupted, and the first opening and the second opening are not in fluid communication.

6. The small-diameter fixed ball valve according to claim 4, characterized in that, It also includes a first valve cover and a second valve cover. The second valve cover is installed together with the valve body by screws. The first valve cover and the second valve cover are installed together by screws, and a rotating cavity is formed between the first valve cover, the second valve cover and the valve body. The upper valve shaft is installed in the rotating cavity and can rotate in the rotating cavity.

7. The small-diameter fixed ball valve according to claim 6, characterized in that, A limiting sleeve is installed on the upper valve shaft. The outer diameter of the limiting sleeve is greater than the maximum outer diameter of the upper valve shaft. When the upper valve shaft is installed in the rotating cavity, the limiting sleeve is located in the rotating cavity, and the outer diameter of the limiting sleeve is smaller than the inner diameter of the rotating cavity.

8. The small-diameter fixed ball valve according to claim 4, characterized in that, It also includes a connecting cap and a rotating rod. The rotating rod is installed on the connecting cap. The connecting cap is fixed to the upper valve shaft by screws. Rotating the rotating rod causes the connecting cap to rotate, and the connecting cap causes the upper valve shaft to rotate.

9. The small-diameter fixed ball valve according to claim 4, characterized in that, It also includes a valve core, which is installed in the mounting cavity of the valve body and is sealed and fitted together with the ball.

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