Low torque ball valve

Abstract

The utility model relates to valve technical field especially low torque ball valve, the inner wall of rotation cavity is recessed with rotation groove still, the rotation axle that is equipped with with rotation groove is adapted on the ball, the one end that the valve stem extends into rotation groove is equipped with the connecting arc block, both sides side surface of connecting arc block are all plane, and the end of connecting arc block is the cambered surface, the arc groove that is equipped with with connecting arc block is adapted on the rotation axle, both sides side surface of connecting arc block is equipped with at least one semicircle cylinder respectively, the axis of every semicircle cylinder is parallel with the axis of rotation axle, both sides inner wall of arc groove is equipped with at least one semicircle pit that is adapted with semicircle cylinder respectively, the utility model discloses through rotation axle and rotation groove cooperation and semicircle cylinder and semicircle pit cooperation, formed double radial location structure, the ball can also keep smooth rotation under long -term use, thereby reduced the torque that the ball needed to drive.

Description

Technical Field

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

[0002] A ball valve is a type of valve whose opening and closing element is a ball driven by a valve stem that rotates around the valve axis. Due to its reliable sealing, simple structure, and convenient maintenance, the ball valve has become one of the most widely used valves.

[0003] When the valve is opened or closed, the valve stem will drive the ball to rotate. The connection between the valve stem and the ball will have a gap due to friction, which will lead to an unreliable connection between the ball and the valve stem. Moreover, the existing ball valve structure design does not have a radial limiting structure between the valve stem and the ball, and the ball is prone to deflection and jamming. The torque required to drive the ball will also increase accordingly.

[0004] The purpose of this invention is to propose corresponding solutions to the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and provide a low-torque ball valve. This invention forms a double radial limiting structure by cooperating the rotating shaft with the rotating groove and the semi-cylinder with the semi-circular pit. The ball can maintain smooth rotation even under long-term use, thereby reducing the torque required to drive the ball.

[0006] The technical solution adopted by this utility model is as follows: A low-torque ball valve includes a valve body, a ball, and a valve stem. The valve body has a rotating cavity for the ball to rotate. The valve stem passes through the valve body and is connected to the ball. The inner wall of the rotating cavity is also recessed with a rotating groove. The ball has a rotating shaft adapted to the rotating groove. One end of the valve stem that extends into the rotating groove has a connecting arc block. Both sides of the connecting arc block are flat, and the end of the connecting arc block is an arc surface. The rotating shaft has an arc groove adapted to the connecting arc block. At least one semi-cylinder is provided on each side of the connecting arc block. The axis of each semi-cylinder is parallel to the axis of the rotating shaft. At least one semi-circular pit adapted to the semi-cylinder is provided on the inner wall of each side of the arc groove.

[0007] Two semi-cylinders are provided on each of the two sides of the connecting arc block, and the two semi-cylinders are symmetrically arranged on both sides of the axis of the connecting arc block. Two semi-circular pits are provided on the inner walls of both sides of the arc groove.

[0008] The connecting arc block is also provided with at least one plug-in plate with the same thickness as the diameter of the semi-cylinder. The plug-in plate passes through the connecting arc block to form a plug-in, and each end of the plug-in plate is connected to a semi-cylinder.

[0009] A pin also passes through the connecting arc block, and the pin also passes through the plug-in plate.

[0010] The semi-cylinders on the two sides of the connecting arc block are a first cylinder and a second cylinder, respectively. A mounting through hole is provided on the connecting arc block at the position between the first cylinder and the second cylinder. The first cylinder and the second cylinder extend into the mounting through hole with staggered first sliding plate and second sliding plate, respectively. A first elastic element is provided between the first cylinder and the second sliding plate, and a second elastic element is provided between the second cylinder and the first sliding plate.

[0011] Both the first cylinder and the second cylinder have a limiting groove at one end near the mounting through hole. One end of the first elastic member is embedded in the limiting groove of the first cylinder, and one end of the second elastic member is embedded in the limiting groove of the second cylinder.

[0012] A pin is also passed through the connecting arc block. The first slide plate and the second slide plate are respectively provided with a first slide groove and a second slide groove. The first slide groove and the second slide groove are also staggered. The pin passes through both the first slide groove and the second slide groove.

[0013] The beneficial effects of this utility model are as follows: Through the cooperation of the rotating shaft and the rotating groove, and the precise docking of the semi-cylinder and the semi-circular pit, a multi-stage radial limiting structure is formed, which effectively constrains the radial movement of the ball, prevents the ball from deflecting or getting stuck during opening and closing, and ensures the smoothness and reliability of the ball valve operation. Through the cooperation of the semi-cylinder on both sides of the connecting arc block and the semi-circular pit on the inner wall of the arc groove, the friction and gap at the connection between the valve stem and the ball are effectively reduced, the mechanical strength of the connection is enhanced, and the loosening of the connection due to long-term use is avoided, thereby improving the sealing performance and service life of the ball valve. At the same time, the cooperation of the semi-cylinder and the semi-circular pit further reduces the local stress concentration, making the ball rotate more smoothly, thereby significantly reducing the torque required to drive the ball and improving the energy efficiency and ease of operation of the ball valve. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3This is a schematic diagram of the internal structure of the valve body in this utility model; Figure 4 This is a schematic diagram of the combination of the valve stem and the ball in this utility model; Figure 5 This is a schematic diagram of the structure of the sphere in this utility model; Figure 6 This is a schematic diagram of the valve stem structure in this utility model; Figure 7 This is a cross-sectional schematic diagram of the first embodiment of the present utility model; Figure 8 This is a cross-sectional schematic diagram of another embodiment of the present utility model; In the figure, 1-valve body, 2-ball, 3-valve stem, 4-rotating cavity, 5-rotating groove, 6-rotating shaft, 7-connecting arc block, 8-arc groove, 9-semi-cylinder, 10-semi-circular pit, 11-plug plate, 12-pin, 13-first cylinder, 14-second cylinder, 15-mounting through hole, 16-first sliding plate, 17-second sliding plate, 18-first elastic element, 19-second elastic element, 20-limiting groove, 21-first sliding groove, 22-second sliding groove. Detailed Implementation

[0016] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0017] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0018] The directional and positional terms used in this utility model, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0019] like Figures 1 to 8As shown, this is an embodiment of the present invention. A low-torque ball valve includes a valve body 1, a ball 2, and a valve stem 3. The valve body 1 has a rotating cavity 4 for the ball 2 to rotate. The valve stem 3 passes through the valve body 1 and is connected to the ball 2. The inner wall of the rotating cavity 4 is also recessed with a rotating groove 5. The ball 2 is provided with a rotating shaft 6 adapted to the rotating groove 5. One end of the valve stem 3 that extends into the rotating groove 5 is provided with a connecting arc block 7. Both sides of the connecting arc block 7 are flat, and the end of the connecting arc block 7 is an arc surface. The rotating shaft 6 is provided with an arc groove 8 adapted to the connecting arc block 7. At least one semi-cylinder 9 is provided on each side of the connecting arc block 7. The axis of each semi-cylinder 9 is parallel to the axis of the rotating shaft 6. At least one semi-circular pit 10 adapted to the semi-cylinder 9 is provided on the inner wall of each side of the arc groove 8.

[0020] The beneficial effects of this design are as follows: the cooperation between the rotating shaft and the rotating groove, and the precise docking between the semi-cylinder and the semi-circular pit, form a multi-stage radial limiting structure, effectively constraining the radial movement of the ball and preventing the ball from deflecting or getting stuck during opening and closing, thus ensuring the smoothness and reliability of the ball valve operation. The cooperation between the semi-cylinders on both sides of the connecting arc block and the semi-circular pits on the inner wall of the arc groove effectively reduces friction and gaps at the connection between the valve stem and the ball, enhancing the mechanical strength of the connection and preventing loosening due to long-term use. This improves the sealing performance and service life of the ball valve. Simultaneously, the cooperation between the semi-cylinder and the semi-circular pit further reduces local stress concentration, making the ball rotate more smoothly, thereby significantly reducing the torque required to drive the ball and improving the energy efficiency and ease of operation of the ball valve.

[0021] Further, two semi-cylinders 9 are provided on the two sides of the connecting arc block 7, and the two semi-cylinders 9 are symmetrically arranged on both sides of the axis of the connecting arc block 7. Two semi-circular pits 10 are provided on the inner walls of the two sides of the arc groove 8.

[0022] The beneficial effects of this design are as follows: the symmetrically distributed two sets of semi-cylinders and semi-circular pits make the force on both sides of the connecting arc block more balanced, which not only helps to further reduce the rotational torque, but also significantly reduces the wear of key parts. The torque transmitted by the valve stem is also more uniform, further improving the smoothness and reliability of operation.

[0023] Furthermore, the connecting arc block 7 is provided with at least one plug-in plate 11 with the same thickness as the diameter of the semi-cylinder 9. The plug-in plate 11 passes through the connecting arc block 7 to form a plug-in, and each end of the plug-in plate 11 is connected to a semi-cylinder 9.

[0024] The beneficial effects of this design are as follows: the plug-in plate makes the semi-cylinder detachable, allowing for installation or removal by inserting or pushing it out from either side; the split structure is easy to maintain and process; and the plug-in plate can also serve as a key component for force transmission, transferring the force on both ends of the semi-cylinder and achieving symmetry and balance of forces.

[0025] Furthermore, a pin 12 is also inserted through the connecting arc block 7, and the pin 12 also penetrates the plug-in plate 11.

[0026] The beneficial effects of this design are as follows: the pin can effectively lock the plug plate to form a mechanical interlock structure, preventing the plug plate from loosening and slipping. Furthermore, the length of the pin is greater than that of the connecting arc block but less than the inner diameter of the rotating groove. When the valve stem and the ball are installed in the valve body, the rotating groove can effectively restrict the pin and prevent the pin from falling off.

[0027] Further configuration: the semi-cylinders 9 on the two sides of the connecting arc block 7 are respectively a first cylinder 13 and a second cylinder 14; the connecting arc block 7 has a through hole 15 corresponding to the position between the first cylinder 13 and the second cylinder 14; the first cylinder 13 and the second cylinder 14 have staggered first sliding plate 16 and second sliding plate 17 extending into the through hole 15 respectively; a first elastic element 18 is provided between the first cylinder 13 and the second sliding plate 17; and a second elastic element 19 is provided between the second cylinder 14 and the first sliding plate 16.

[0028] The beneficial effects of this design are as follows, which is another embodiment of this utility model. Through the combined design of the first and second sliding plates and the elastic element, the two cylinders obtain continuous and opposite elastic preload during the operation of the ball valve. This can automatically and in real time compensate for the gap caused by wear, ensuring that the cylinder and the semi-circular pit are always in a tight fit, thereby achieving true zero-gap transmission. This completely solves the problem of loose and unreliable connection caused by gaps. Furthermore, the introduction of the elastic element transforms rigid contact into elastic contact, which can effectively absorb minor vibrations and impacts during operation, further suppressing the ball's deflection and jamming, and maintaining a stable low driving torque. Both the first and second elastic elements use springs from the prior art.

[0029] Furthermore, both the first cylinder 13 and the second cylinder 14 are provided with a limiting groove 20 at one end near the mounting through hole 15. One end of the first elastic member 18 is embedded in the limiting groove 20 of the first cylinder 13, and one end of the second elastic member 19 is embedded in the limiting groove 20 of the second cylinder 14.

[0030] The beneficial effects of this design are as follows: the limiting groove provides a precise installation position for the elastic element, effectively preventing the elastic element from shifting, twisting, or dislodging under long-term vibration and stress.

[0031] Furthermore, a pin 12 is also provided through the connecting arc block 7. The first sliding plate 16 and the second sliding plate 17 are respectively provided with a first sliding groove 21 and a second sliding groove 22. The first sliding groove 21 and the second sliding groove 22 are also staggered. The pin 12 passes through both the first sliding groove 21 and the second sliding groove 22.

[0032] The beneficial effects of this design are as follows: by limiting the displacement distance of the first and second slide plates simultaneously through the pin, excessive displacement can prevent damage or jamming of parts. It can also provide precise guidance. The pin integrates the entire dynamic compensation mechanism into a compact and linked functional module, so that the elastic compensation function can be fully preserved and play a controllable role.

[0033] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A low-torque ball valve, comprising a valve body (1), a ball (2), and a valve stem (3), wherein the valve body (1) has a rotating cavity (4) for rotating the ball (2), and the valve stem (3) passes through the valve body (1) and is connected to the ball (2), characterized in that: The inner wall of the rotating cavity (4) is also recessed with a rotating groove (5). The sphere (2) is provided with a rotating shaft (6) that is adapted to the rotating groove (5). The valve stem (3) is provided with a connecting arc block (7) at one end that extends into the rotating groove (5). Both sides of the connecting arc block (7) are flat, and the end of the connecting arc block (7) is an arc surface. The rotating shaft (6) is provided with an arc groove (8) that is adapted to the connecting arc block (7). At least one semi-cylinder (9) is provided on each side of the connecting arc block (7). The axis of each semi-cylinder (9) is parallel to the axis of the rotating shaft (6). At least one semi-circular pit (10) that is adapted to the semi-cylinder (9) is provided on the inner wall of each side of the arc groove (8).

2. The low-torque ball valve according to claim 1, characterized in that: Two semi-cylinders (9) are provided on the two sides of the connecting arc block (7), and the two semi-cylinders (9) are symmetrically arranged on both sides of the axis of the connecting arc block (7). Two semi-circular pits (10) are provided on the inner walls of both sides of the arc groove (8).

3. A low-torque ball valve according to claim 1, characterized in that: The connecting arc block (7) is also provided with at least one plug-in plate (11) with the same thickness as the diameter of the semi-cylinder (9). The plug-in plate (11) passes through the connecting arc block (7) to form a plug-in, and the two ends of the plug-in plate (11) are respectively connected to a semi-cylinder (9).

4. A low-torque ball valve according to claim 3, characterized in that: A pin (12) also passes through the connecting arc block (7), and the pin (12) also passes through the plug plate (11).

5. A low-torque ball valve according to claim 1, characterized in that: The semi-cylinders (9) on the two sides of the connecting arc block (7) are the first cylinder (13) and the second cylinder (14), respectively. The connecting arc block (7) has a through hole (15) at the position between the first cylinder (13) and the second cylinder (14). The first cylinder (13) and the second cylinder (14) have staggered first sliding plate (16) and second sliding plate (17) extending into the through hole (15), respectively. A first elastic element (18) is provided between the first cylinder (13) and the second sliding plate (17), and a second elastic element (19) is provided between the second cylinder (14) and the first sliding plate (16).

6. A low-torque ball valve according to claim 5, characterized in that: Both the first cylinder (13) and the second cylinder (14) have a limiting groove (20) at one end near the mounting through hole (15). One end of the first elastic member (18) is embedded in the limiting groove (20) of the first cylinder (13), and one end of the second elastic member (19) is embedded in the limiting groove (20) of the second cylinder (14).

7. A low-torque ball valve according to claim 5, characterized in that: A pin (12) also passes through the connecting arc block (7). The first slide plate (16) and the second slide plate (17) are respectively provided with a first slide groove (21) and a second slide groove (22). The first slide groove (21) and the second slide groove (22) are also staggered. The pin (12) passes through the first slide groove (21) and the second slide groove (22) at the same time.

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