A ball valve

Abstract

This utility model belongs to the field of valve technology and discloses a ball valve. The ball valve includes a valve body, a valve stem assembly, and a valve core. The valve core is disposed within the valve body, and the valve body has a mounting hole. The valve stem assembly passes through the mounting hole and connects to the valve core. Two circumferentially spaced limiting blocks are integrally formed on the inner wall of the mounting hole. An arc groove is formed between two adjacent circumferential surfaces of the two limiting blocks, with a central angle of 90°. The valve stem assembly can rotate within the arc groove and abut against the two limiting blocks respectively. The ball valve provided by this utility model, by integrally forming the limiting blocks with the valve body, can reduce assembly errors and improve the limiting accuracy of the ball valve.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a ball valve. Background Technology

[0002] Ball valves are common pipeline valves, primarily used in pipelines to cut off, distribute, and change the flow direction of media. They are widely used in industrial and civil pipelines such as water supply and heating systems. Traditional ball valves typically have limiting structures on both the valve body and stem to prevent over-opening and over-closing. These two limiting structures work together to ensure the ball rotates within a 0-90° range. Currently, the limiting structures on the valve body are usually separate components. Assembly errors during the assembly of the limiting structures and valve body result in a larger limiting error after the two limiting structures are engaged, reducing the limiting accuracy of the ball valve.

[0003] Therefore, there is an urgent need to provide a ball valve to solve the above problems. Utility Model Content

[0004] The purpose of this utility model is to provide a ball valve that reduces assembly errors and improves the limiting accuracy of the ball valve by integrally molding the limiting block with the valve body.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A ball valve includes a valve body, a valve stem assembly, and a valve core. The valve core is disposed within the valve body, and the valve body has a mounting hole. The valve stem assembly passes through the mounting hole and is connected to the valve core. Two circumferentially spaced limiting blocks are integrally formed on the inner wall of the mounting hole. An arc groove is formed between two adjacent circumferentially spaced surfaces of the two limiting blocks, and the central angle of the arc groove is 90°. The valve stem assembly can rotate within the arc groove and abut against the two limiting blocks respectively.

[0007] As an alternative, the valve stem assembly includes a valve stem and a positioning plate, the positioning plate being circumferentially fixedly sleeved on the valve stem, and the positioning plate being able to rotate within the arc groove and abut against the two limiting blocks respectively.

[0008] As an optional solution, the positioning plate includes an annular body and a protrusion. The annular body is circumferentially fixedly sleeved on the valve stem, and the protrusion protrudes from the outer circumferential surface of the annular body. The protrusion can rotate within the arc groove and abut against the two limiting blocks respectively.

[0009] As an optional solution, two protrusions are symmetrically arranged on the outer circumference of the annular body. Both limiting blocks are arc-shaped and symmetrically arranged about the axis of the mounting hole. Two arc grooves are formed between the two limiting blocks in the circumferential direction. The two arc grooves are symmetrically arranged about the axis of the mounting hole. Each protrusion can rotate in the corresponding arc groove and abut against the corresponding limiting block.

[0010] As an alternative, the inner hole of the positioning plate is a regular polygonal hole, and the circumferential contour of the valve stem is adapted to the shape of the inner hole of the positioning plate.

[0011] As an optional solution, the ball valve further includes a pressure plate, which is sleeved on the valve stem and covers the upper side of the limiting block and the positioning plate, and the pressure plate is threadedly connected to the mounting hole.

[0012] As an optional solution, a slot is formed on the upper surface of the pressure plate.

[0013] As an alternative, there is a gap between the pressure plate and the positioning plate.

[0014] The beneficial effects of this utility model are:

[0015] This utility model provides a ball valve in which the rotation axis of the valve stem assembly overlaps with the axis of the mounting hole. When the valve stem assembly rotates within the arc groove, the forward and reverse rotation of the valve stem contacts two adjacent surfaces of two limiting blocks, respectively. Therefore, the rotation stroke of the valve stem assembly is limited by the two limiting blocks, thereby limiting the rotation angle of the valve stem assembly and reducing the difficulty of operation. Since the central angle of the arc groove is 90°, this forms a 90° rotation limit for the valve stem assembly in both directions, corresponding to the rotation angle of the valve core from fully closed to fully open, thus ensuring the accurate opening and closing state of the ball valve and achieving precise and reliable opening and closing limit of the entire ball valve. In this application, since the two limiting blocks and the valve body are integrally formed, not only can assembly errors be reduced and the limiting accuracy of the ball valve be improved, but also assembly efficiency can be increased, the number of parts used for installing the limiting structure inside the valve body can be reduced, and the assembly cost can be reduced. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the ball valve described in an embodiment of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the ball valve after the pressure plate is removed, according to an embodiment of the present utility model;

[0018] Figure 3 This is a schematic diagram of the ball valve described in an embodiment of the present invention.

[0019] In the picture:

[0020] 10. Valve body; 11. Branch pipe; 111. Mounting hole; 112. Limiting block; 113. Arc groove; 12. Main pipe; 121. Flow passage;

[0021] 20. Valve stem assembly; 21. Valve stem; 22. Positioning plate; 221. Annular body; 222. Protrusion;

[0022] 30. Pressure plate; 31. Slotted groove. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between 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.

[0025] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1As shown, this embodiment provides a ball valve, including a valve body 10, a valve stem assembly 20, and a valve core (not shown). The valve core is disposed inside the valve body 10. The valve body 10 includes a horizontally arranged main pipe 12 and a branch pipe 11 connected to the upper end of the main pipe 12. The main pipe 12 is provided with a flow channel 121 extending along its axial direction. The valve core is spherical and disposed inside the main pipe 12. The valve core is provided with a through hole for connecting to the flow channel 121. The branch pipe 11 of the valve body 10 is provided with a mounting hole 111 connecting to the flow channel 121. One end of the valve stem assembly 20 passes through the mounting hole 111 and is connected to the valve core. The other end of the valve stem assembly 20 extends out of the branch pipe 11. Rotating the valve stem 21 causes the valve core to rotate, switching the ball valve between the open and closed states. When the ball valve is in the open state, the center of the through hole of the valve core and the center of the flow channel 121 are completely aligned, allowing fluid to flow. Rotating the valve stem 21 causes the valve core to rotate, adjusting the overlapping area of ​​the through hole and the flow channel 121, thereby adjusting the flow rate. When the through hole is perpendicular to the axis of the flow channel 121, fluid can be cut off, thus closing the ball valve.

[0028] Optionally, the ball valve in this embodiment can be an electric ball valve or a manual ball valve. For an electric ball valve, the end of the valve stem assembly 20 extending outside the branch pipe 11 can be connected to an electric actuator, which drives the valve stem assembly 20 and the valve core to rotate automatically. The electric actuator can be a motor assembly or an electromagnetic coil assembly. For a manual ball valve, the end of the valve stem assembly 20 extending outside the branch pipe 11 can be connected to a handle, allowing the operator to drive the valve stem assembly 20 and the valve core to rotate via the handle.

[0029] Combination Figure 1 and Figure 2 The mounting hole 111 is a stepped hole with an inner diameter that gradually decreases from top to bottom. The valve stem assembly 20 is sealed to the small diameter end of the mounting hole 111. Two circumferentially spaced limiting blocks 112 are integrally formed on the inner wall of the large diameter section of the mounting hole 111. An arc groove 113 is formed between two adjacent surfaces of the two limiting blocks 112 along the circumferential direction. The central angle of the arc groove 113 is 90°, that is, the included angle between the extension lines of two adjacent surfaces of the two limiting blocks 112 is 90°. The valve stem assembly 20 can rotate in the arc groove 113 and abut against the two limiting blocks 112 respectively.

[0030] Specifically, the rotation axis of the valve stem assembly 20 overlaps with the axis of the mounting hole 111. When the valve stem assembly 20 rotates within the arc groove 113, the forward and reverse rotation of the valve stem 21 contacts two adjacent surfaces of the two limiting blocks 112, respectively. Therefore, the rotation stroke of the valve stem assembly 20 is limited by the two limiting blocks 112, thereby limiting the rotation angle of the valve stem assembly 20 and reducing the difficulty of operation. Since the central angle of the arc groove 113 is 90°, this forms a 90° rotation limit for the valve stem assembly 20 in both directions, corresponding to the rotation angle of the valve core from fully closed to fully open, thus ensuring the accurate opening and closing state of the ball valve and achieving precise and reliable ball valve opening and closing limit. In this embodiment, since the two limiting blocks 112 and the valve body 10 are integrally formed, not only can assembly errors be reduced and the limiting accuracy of the ball valve be improved, but also assembly efficiency can be improved, reducing the number of parts used for installing the limiting structure inside the valve body 10 and reducing assembly costs.

[0031] In this embodiment, as Figure 1 and Figure 2 As shown, the valve stem assembly 20 includes a valve stem 21 and a positioning plate 22. One end of the valve stem 21 passes through a mounting hole 111 and is fixedly connected to the valve core. The other end of the valve stem 21 extends outside the branch pipe 11. The positioning plate 22 is circumferentially fixedly fitted around the valve stem 21 and abuts against the stepped surface of the mounting hole 111. The positioning plate 22 and the valve stem 21 can rotate synchronously. The positioning plate 22 can rotate within the arc groove 113 and abut against two limiting blocks 112 respectively. By using a separate valve stem 21 and positioning plate 22 for the valve stem assembly 20, the complex overall structure can be decomposed into two simple components, which can reduce the processing difficulty and production cost. Furthermore, since each component is independent, when a component is damaged, it can be replaced or repaired individually without replacing the entire structure, thus improving maintenance efficiency and reducing maintenance costs. Of course, in other optional embodiments, the valve stem 21 and positioning plate 22 can also be integrally formed into the valve stem assembly 20, which is not specifically limited here.

[0032] Specifically, such as Figure 2As shown, in this embodiment, the positioning plate 22 includes an annular body 221 and a protrusion 222. The annular body 221 has a circular outer contour and is circumferentially fixedly fitted onto the valve stem 21. The protrusion 222 protrudes from the outer circumferential surface of the annular body 221 and can rotate within the arc groove 113, abutting against the two limiting blocks 112 respectively. The function of the annular body 221 is to achieve synchronous rotation with the circumferential limiting cooperation of the valve stem 21, and the function of the protrusion 222 is to achieve limiting with the sliding cooperation of the arc groove 113. When the valve stem 21 drives the positioning plate 22 to rotate, the protrusion 222 rotates within the arc groove 113. The forward and reverse rotation of the valve stem 21 allows the protrusion 222 to contact the two adjacent surfaces of the two limiting blocks 112 respectively, forming a 90° forward and reverse rotation limiting of the valve stem 21, corresponding to the rotation angle of the valve core from fully closed to fully open, thereby ensuring the accurate opening and closing state of the ball valve.

[0033] Optionally, in this embodiment, as Figure 2 As shown, two protrusions 222 are symmetrically arranged on the outer circumference of the annular body 221. Both limiting blocks 112 are arc-shaped and symmetrically arranged about the axis of the mounting hole 111. Two arc grooves 113 are formed between the two limiting blocks 112 in the circumferential direction. The two arc grooves 113 are symmetrically arranged about the axis of the mounting hole 111, and the central angle of each arc groove 113 is 90°. Each protrusion 222 can rotate within its corresponding arc groove 113 and abut against its corresponding limiting block 112. The included angle between the extension lines of two adjacent surfaces of the two limiting blocks 112 is 90°, and the two opposing surfaces of the two limiting blocks 112 are parallel to each other. When the valve core is fully open or fully closed, the sides of the two protrusions 222 can abut against the two parallel surfaces of the two limiting blocks 112, thereby ensuring the accuracy of the ball valve's 90° limit switch.

[0034] Specifically, in order to ensure that the valve stem 21 and the positioning plate 22 rotate synchronously, such as Figure 2 As shown, in this embodiment, the inner hole of the positioning plate 22 can be a regular polygonal hole, such as a regular square or a regular pentagon. The circumferential contour of the valve stem 21 can be adapted to the shape of the inner hole of the positioning plate 22, making assembly convenient. In another optional embodiment, the inner hole of the positioning hole and the circumferential contour of the valve stem 21 can also be circular. At the same time, one of the inner wall of the positioning plate 22 and the outer peripheral wall of the valve stem 21 is provided with a rib, and the other is provided with a groove. The rib and the groove fit together to limit the movement, which can also achieve synchronous rotation of the valve stem 21 and the positioning plate 22.

[0035] In an optional embodiment, such as Figure 1 and Figure 3As shown, the ball valve also includes a pressure plate 30, which is sleeved on the valve stem 21 and covers the upper side of the limiting block 112 and the positioning plate 22. The pressure plate 30 is threadedly connected to the large-diameter section of the mounting hole 111. The upper surface of the pressure plate 30 is basically flush with the upper surface of the branch pipe 11, and the lower surface of the pressure plate 30 abuts against the limiting block 112. In the prior art, multiple screws are usually used to fasten the pressure plate 30 to the valve body 10. However, in this embodiment, the pressure plate 30 is directly connected to the large-diameter section of the mounting hole 111 through external threads, eliminating the fastening parts used to install the pressure plate 30, reducing assembly costs. Furthermore, the pressure plate 30 can cover the upper side of the limiting block 112 and the positioning plate 22, providing protection and shielding for the limiting block 112 and the positioning plate 22, thus improving the aesthetic appearance.

[0036] In an optional embodiment, such as Figure 3 As shown, a slot 31 is formed on the upper surface of the pressure plate 30. The slot 31 can be used with tools to facilitate the installation or removal of the pressure plate 30, making manual operation more convenient and saving time and effort.

[0037] In an optional embodiment, such as Figure 1 As shown, there is a gap between the pressure plate 30 and the positioning plate 22. This arrangement prevents the pressure plate 30 and the positioning plate 22 from contacting each other, thus preventing metal-to-metal friction between the positioning plate 22 and the pressure plate 30 when the valve stem 21 drives the positioning plate 22 to rotate. This reduces the torque, making it easier for the valve stem 21 to be rotated by an electric actuator or manually.

[0038] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A ball valve, characterized in that, The valve includes a valve body (10), a valve stem assembly (20), and a valve core. The valve core is located inside the valve body (10). The valve body (10) has an installation hole (111). The valve stem assembly (20) passes through the installation hole (111) and is connected to the valve core. Two circumferentially spaced limiting blocks (112) are integrally formed on the inner wall of the installation hole (111). An arc groove (113) is formed between two adjacent surfaces of the two limiting blocks (112) along the circumferential direction. The central angle of the arc groove (113) is 90°. The valve stem assembly (20) can rotate within the arc groove (113) and abut against the two limiting blocks (112) respectively.

2. The ball valve according to claim 1, characterized in that, The valve stem assembly (20) includes a valve stem (21) and a positioning plate (22). The positioning plate (22) is circumferentially fixedly sleeved on the valve stem (21). The positioning plate (22) can rotate in the arc groove (113) and abut against the two limiting blocks (112) respectively.

3. The ball valve according to claim 2, characterized in that, The positioning plate (22) includes an annular body (221) and a protrusion (222). The annular body (221) is circumferentially fixedly sleeved on the valve stem (21). The protrusion (222) protrudes from the outer circumferential surface of the annular body (221). The protrusion (222) can rotate in the arc groove (113) and abut against the two limiting blocks (112) respectively.

4. The ball valve according to claim 3, characterized in that, Two protrusions (222) are symmetrically arranged on the outer circumference of the annular body (221). The two limiting blocks (112) are both arc-shaped and symmetrically arranged about the axis of the mounting hole (111). Two arc grooves (113) are formed between the two limiting blocks (112) in the circumferential direction. The two arc grooves (113) are symmetrically arranged about the axis of the mounting hole (111). Each protrusion (222) can rotate in the corresponding arc groove (113) and abut against the corresponding limiting block (112).

5. The ball valve according to any one of claims 2-4, characterized in that, The inner hole of the positioning plate (22) is a regular polygonal hole, and the circumferential contour of the valve stem (21) is adapted to the shape of the inner hole of the positioning plate (22).

6. The ball valve according to any one of claims 2-4, characterized in that, The ball valve also includes a pressure plate (30), which is sleeved on the valve stem (21) and covers the upper side of the limiting block (112) and the positioning plate (22). The pressure plate (30) is threadedly connected to the mounting hole (111).

7. The ball valve according to claim 6, characterized in that, A groove (31) is formed on the upper surface of the pressure plate (30).

8. The ball valve according to claim 6, characterized in that, There is a gap between the pressure plate (30) and the positioning plate (22).

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