Frictionless double-seal ball valve

Abstract

The utility model belongs to the technical field of ball valve, and relates to a kind of frictionless double-seal ball valve, it includes valve body, and the left and right sides of valve body are opened and are respectively connected with sealing seat flange at opening, and gasket is arranged between the connecting place of sealing seat flange and valve body, and the valve plate of half-arc spherical shape is respectively arranged in valve body to correspond the sealing seat flange of two sides, sealing ring is arranged on the outer side wall of valve plate to correspond the end of sealing seat flange, the inner side wall of valve plate is provided with push rod, rotating support is arranged in the middle of valve body, two push rods are respectively inserted into rotating support from the left and right sides of rotating support, hollow inclined block is arranged in rotating support, two pairs of special-shaped hole channels are arranged in front and back in pair on the both sides of hollow inclined block, the inner end of two push rods is respectively inserted into two pairs of special-shaped hole channels and can slide in special-shaped hole channel, screw rod is connected on the upper portion of hollow inclined block, and steering sliding block body is fixed on the outer side of middle portion of screw rod.The utility model can be without friction when opening and closing valve, and the force distance of valve opening and closing is small, more energy-saving, and can reach zero leakage.

Description

Technical Field

[0001] This utility model belongs to the field of ball valve technology, and specifically relates to a frictionless double-seal ball valve. Background Technology

[0002] Existing ball valves are divided into ball valves and semi-ball valves. Their sealing surfaces experience friction during opening and closing, requiring the overcoming of a significant frictional torque. This torque is primarily generated to prevent leakage at the sealing surface, increasing the specific pressure of the sealing surface and consequently increasing friction (F=SP), where F is the frictional force, S is the contact area of ​​the sealing surface, and P is the pressure generated by the sealing surface (specific pressure). Therefore, a larger transmission device is required, increasing costs and production expenses, and wasting resources. Utility Model Content

[0003] This invention addresses the aforementioned problems and overcomes the shortcomings of existing technologies by providing a frictionless double-seal ball valve. This invention eliminates friction during valve opening and closing, reduces valve opening and closing torque, saves energy, and achieves zero leakage.

[0004] To achieve the above objectives, the present invention adopts the following technical solution.

[0005] This utility model provides a frictionless double-seal ball valve, comprising a valve body, characterized in that the valve body has openings on both the left and right sides, and sealing seat flanges are respectively connected to the openings. A gasket is provided between the sealing seat flange and the valve body. A semi-circular valve plate is respectively provided on the sealing seat flange on both sides of the valve body. A sealing ring is provided on the outer wall of the valve plate corresponding to the end of the sealing seat flange. A push rod is provided on the inner wall of the valve plate. A rotating bracket is provided in the middle of the valve body. Two push rods respectively pass through the rotating bracket from the left and right sides and are able to reciprocate relative to the rotating bracket. Mounting covers are connected to both sides of the rotating bracket. A mounting cover is provided inside the rotating bracket. A hollow inclined block has two pairs of irregularly shaped channels on both sides, one in front and one behind. The inner ends of two push rods are respectively inserted into the two pairs of irregularly shaped channels and can slide within them. A lead screw is connected to the upper part of the hollow inclined block and can rotate freely within it. A steering slider is fixed to the outer side of the middle part of the lead screw. A guide body is connected to the upper part of the valve body. An irregularly shaped track is provided on the side wall of the guide body along the axial direction. The steering slider can be guided and restricted by the irregularly shaped track when it moves. The lead screw passes through the guide body and its upper end is threadedly connected to a transmission device connected above the guide body. The rotation of the transmission device drives the lead screw to rotate and move along the axial direction.

[0006] Furthermore, the upper end of the rotating bracket passes through the upper part of the valve body and is provided with a sealing cover between it and the valve body, and the lower end of the rotating bracket is inserted into the lower end of the valve body. The rotating bracket and the sealing cover, and the rotating bracket and the lower end of the valve body are respectively rotatably engaged.

[0007] Furthermore, the irregularly shaped channel on the hollow inclined block includes an inclined hole section and a straight hole section. The inclined hole section is inclined from the outside to the center and is connected to the straight hole section arranged from top to bottom below.

[0008] Furthermore, the inner end of the push rod is connected to a transverse guide rod, and the two ends of the guide rod pass through each pair of irregularly shaped channels. The movement of the guide rod within the irregularly shaped channels drives the push rod to move axially.

[0009] Furthermore, the upper side of the steering slider is provided with rollers that can roll along the irregular track.

[0010] Furthermore, the irregular track on the guide body includes a spiral segment and a straight segment. The spiral segment is spirally arranged from bottom to top along the axial direction of the guide body and is connected to the straight segment arranged from bottom to top above.

[0011] Furthermore, the height of the spiral segment corresponds to the inclined hole segment of the irregular channel, and the length of the straight segment corresponds to the straight hole segment of the irregular channel, so that when the push rod moves to the inflection point of the irregular channel, the roller moves exactly to the inflection point of the irregular track, and when the push rod moves to the bottom of the irregular channel, the roller moves exactly to the top of the irregular track, at which point the valve plate has rotated exactly 90°.

[0012] Furthermore, a semi-circular keyway is provided on the lower side of the steering slider body, and a guide key is provided in the keyway with an interference fit. The rotating bracket is provided with a through keyway corresponding to the guide key, and is clearance-fitted with the guide key.

[0013] Furthermore, limit switches are respectively provided on the side of the guide body at the bottom and top of the corresponding irregular track.

[0014] Furthermore, the rotating bracket is an ellipsoid with its major axis in the vertical direction.

[0015] The beneficial effects of this utility model.

[0016] This utility model adopts a double valve plate with an independent sealing structure, which provides a double seal for the valve itself. The sealing ring and the sealing seat flange are in perpendicular contact during opening and closing, with no friction, resulting in a smaller opening and closing torque and greater energy efficiency, achieving a zero-leakage effect. The sealing performance of the sealing pair is ensured by adjusting the gasket connecting the sealing seat flange and the valve body, facilitating maintenance and replacement of the valve plate sealing ring. Even in operation, the downstream sealing seat flange can be removed to replace the valve plate sealing ring. Attached Figure Description

[0017] To make the technical problems solved, the technical solutions, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0018] Figure 1 This is a schematic diagram of the overall side cross-sectional structure of this utility model.

[0019] Figure 2 This is a structural schematic diagram of the steering slider body of this utility model.

[0020] Figure 3 This is a schematic diagram of the external structure of the guide body of this utility model.

[0021] The markings in the diagram are as follows: 1 is valve body, 2 is sealing seat flange, 3 is gasket, 4 is valve plate, 5 is sealing ring, 6 is push rod, 7 is rotating bracket, 8 is mounting cover, 9 is hollow inclined block, 10 is irregularly shaped channel, 11 is lead screw, 12 is steering slider body, 13 is guide body, 14 is irregularly shaped track, 15 is transmission device, 16 is sealing cover, 17 is guide rod, 18 is roller, 19 is guide key, and 20 is limit switch. Detailed Implementation

[0022] As shown in the accompanying drawings, this embodiment provides a frictionless double-seal ball valve, including a valve body 1. The valve body 1 has openings on both its left and right sides, with sealing seat flanges 2 connected to each opening. A gasket 3 is placed between the sealing seat flange 2 and the valve body 1. The design of the sealing seat on the flange allows the sealing performance of the sealing pair to be ensured by adjusting the gasket 3 connecting the sealing seat flange 2 and the valve body 1, and also facilitates maintenance.

[0023] A semi-circular valve plate 4 is provided on each of the sealing seat flanges 2 on both sides inside the valve body 1. A sealing ring 5 is provided on the outer wall of the valve plate 4 at the end of the sealing seat flange 2. In the working state, the sealing seat flange 2 on the downstream side can also be removed and the sealing ring 5 of the valve plate 4 can be replaced. This function is not possible for ball valves with other structural forms.

[0024] A push rod 6 is provided on the inner side wall of the valve plate 4, which can move together with the valve plate 4.

[0025] A rotating bracket 7 is provided in the middle of the valve body 1. Two push rods 6 pass through the rotating bracket 7 from the left and right sides respectively and can reciprocate relative to the rotating bracket 7. Mounting covers 8 are connected to both sides of the rotating bracket 7. A hollow inclined block 9 is provided inside the rotating bracket 7. The hollow inclined block 9 can be installed by opening the mounting cover 8. In order to facilitate sufficient space for the installation of the hollow inclined block 9 and to meet the movement trajectory of the hollow inclined block 9, the rotating bracket is set as an ellipsoid with the vertical direction as the major axis.

[0026] Two pairs of irregularly shaped channels 10 are arranged in pairs on both sides of the hollow inclined block 9. The irregularly shaped channels 10 on the hollow inclined block 9 include inclined hole sections and straight hole sections. The inclined hole sections are inclined from the outside to the center and are connected to the straight hole sections arranged from top to bottom below.

[0027] The inner ends of the two push rods 6 are respectively connected to the transverse guide rods 17. The two ends of the guide rods 17 pass through and are inserted into each pair of irregular channels 10 and can slide along the trajectory of the irregular channels 10. The movement of the guide rods 17 in the irregular channels 10 drives the push rods 6 to move axially.

[0028] The upper end of the rotating bracket 7 passes through the upper part of the valve body 1 and is provided with a sealing cover 16 between it and the valve body 1. The lower end of the rotating bracket 7 is inserted into the lower end of the valve body 1. The rotating bracket 7 and the sealing cover 16, and the rotating bracket 7 and the lower end of the valve body 1 are respectively rotated and engaged, so that the rotating bracket 7 can play a limiting role when it moves relative to the valve body 1 inside the valve body 1.

[0029] A lead screw 11 is connected to the upper part of the hollow inclined block 9. The lead screw 11 can rotate freely inside the hollow inclined block 9. As the main component that drives the valve plate 4 to move, the lead screw 11 can drive the hollow inclined block 9 to move when it rotates and moves axially. In turn, the push rod 6 and the valve plate 4 can rotate and reciprocate through the irregular hole 10 on the hollow inclined block 9. The valve can be opened and closed by the position between the valve plate 4 and the valve body 1.

[0030] A steering slider 12 is fixed to the outer side of the middle part of the lead screw 11. A guide body 13 is connected to the upper part of the valve body 1. A special-shaped track 14 is arranged along the axial direction on the side wall of the guide body 13. The special-shaped track 14 includes a spiral section and a straight section. The spiral section is spirally arranged from bottom to top along the axial direction of the guide body 13 and is connected to the straight section arranged from bottom to top above.

[0031] The upper side of the steering slider body 12 is provided with a roller 18 that can roll along the irregular track 14. When the slider body moves, the roller 18 can be guided and restricted by the irregular track 14.

[0032] The lower side of the steering slider body 12 is provided with a semi-circular keyway, and a guide key 19 is provided in the keyway with an interference fit. The rotating bracket 7 is provided with a through keyway corresponding to the guide key 19, which is clearance-fitted with the guide key 19. The guide key 19 causes the rotating bracket to move up and down along the guide and can transmit torque.

[0033] The lead screw 11 extends out of the guide body 13 and its upper end is threadedly connected to the transmission device 15 connected above the guide body 13. The rotation of the transmission device 15 drives the lead screw 11 to rotate and move axially.

[0034] The height of the spiral section corresponds to the inclined section of the irregular channel 10, and the length of the straight section corresponds to the straight section of the irregular channel 10. When the push rod 6 moves to the inflection point of the irregular channel 10, the roller 18 moves to the inflection point of the irregular track 14. When the push rod 6 moves to the bottom of the irregular channel 10, the roller 18 moves to the top of the irregular track 14. At this time, the valve plate 4 has rotated 90°.

[0035] Limit switches 20 are respectively provided on the side of the guide body 13 at the bottom and top of the corresponding irregular track 14. The limit switches 20 detect the movement position of the steering slider 12 and transmit signals to control the start and stop of the transmission device 15.

[0036] The valve opening principle is as follows: Under the action of the transmission device 15, the transmission screw 11 rotates, and the lower end of the screw 11 rotates freely within the hollow inclined block 9. The screw 11 rotates and pulls the hollow inclined block 9 upward (at this time, the guide rod 17 is in the inclined hole section of the irregular channel 10 of the hollow inclined block 9), forcing the push rod 6 on the valve plate 4 to move towards the center of the valve body 1 under the action of the hollow inclined block 9, causing the valve plate 4 to disengage from the sealing seat flange 2. The screw 11 continues to rotate, and the roller 18 moves along the spiral section of the irregular track 14 on the guide body 13. After rotating 90°, the roller 18 reaches the inflection point of the irregular track 14, and the guide rod 17 is at the inflection point of the irregular channel 10 of the hollow inclined block 9, causing the valve to reach the fully open position. The roller 18 continues to move upward to the top of the straight section of the irregular track 14, and the guide rod 17 moves to the lowest end of the straight hole section of the irregular channel 10 of the hollow inclined block 9, and the valve is fully opened and self-locked.

[0037] The opposite of the above movement is the valve closing process, which operates on the same principle, except that the direction of rotation of the lead screw 11 is opposite.

[0038] It is understood that the above specific description of this utility model is only used to illustrate this utility model and is not limited to the technical solutions described in the embodiments of this utility model. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to this utility model to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of this utility model.

Claims

1. A frictionless double-seal ball valve, comprising a valve body (1), characterized in that, The valve body (1) has openings on the left and right sides, and sealing flanges (2) are connected to the openings respectively. A gasket (3) is provided between the sealing flange (2) and the valve body (1). A semi-circular valve plate (4) is provided on the sealing flange (2) on both sides of the valve body (1). A sealing ring (5) is provided on the outer wall of the valve plate (4) corresponding to the end of the sealing flange (2). A push rod (6) is provided on the inner wall of the valve plate (4). A rotating bracket (7) is provided in the middle of the valve body (1). Two push rods (6) are inserted into the rotating bracket (7) from the left and right sides respectively and can reciprocate relative to the rotating bracket (7). Mounting covers (8) are connected to both sides of the rotating bracket (7). A hollow inclined block (9) is provided inside the rotating bracket (7). The hollow inclined blocks (9) are arranged in pairs on both sides. Two pairs of irregularly shaped channels (10), the inner ends of the two push rods (6) are respectively inserted into the two pairs of irregularly shaped channels (10) and can slide in the irregularly shaped channels (10). The upper part of the hollow inclined block (9) is connected to a lead screw (11). The lead screw (11) can rotate freely in the hollow inclined block (9). The outer side of the middle part of the lead screw (11) is fixed with a steering slider (12). The upper part of the valve body (1) is connected to a guide body (13). The side wall of the guide body (13) is provided with an irregularly shaped track (14) along the axial direction. When the steering slider (12) moves, it can be guided and restricted by the irregularly shaped track (14). The lead screw (11) passes out from the guide body (13) and its upper end is threadedly connected to the transmission device (15) connected above the guide body (13). The rotation of the transmission device (15) drives the lead screw (11) to rotate and move along the axial direction.

2. The frictionless double-seal ball valve according to claim 1, characterized in that, The upper end of the rotating bracket (7) passes through the upper part of the valve body (1) and is provided with a sealing cover (16) between it and the valve body (1). The lower end of the rotating bracket (7) is inserted into the lower end of the valve body (1). The rotating bracket (7) and the sealing cover (16) and the rotating bracket (7) and the lower end of the valve body (1) are respectively rotated and engaged.

3. The frictionless double-seal ball valve according to claim 1, characterized in that... The irregular-shaped channel (10) on the hollow inclined block (9) includes an inclined hole section and a straight hole section. The inclined hole section is inclined from the outside to the center and is connected to the straight hole section arranged from top to bottom below.

4. The frictionless double-seal ball valve according to claim 3, characterized in that, The inner end of the push rod (6) is connected to a transverse guide rod (17). The two ends of the guide rod (17) pass through each pair of irregular channels (10). The movement of the guide rod (17) within the irregular channels (10) drives the push rod (6) to move axially.

5. A frictionless double-seal ball valve according to claim 4, characterized in that, The upper side of the steering slider (12) is provided with a roller (18) that can roll along the irregular track (14).

6. A frictionless double-seal ball valve according to claim 5, characterized in that, The irregular track (14) on the guide body (13) includes a spiral segment and a straight segment. The spiral segment is spirally arranged from bottom to top along the axial direction of the guide body (13) and is connected to the straight segment arranged from bottom to top above.

7. A frictionless double-seal ball valve according to claim 6, characterized in that, The height of the spiral segment corresponds to the inclined hole segment of the irregular channel (10), and the length of the straight segment corresponds to the straight hole segment of the irregular channel (10). When the push rod (6) moves to the inflection point of the irregular channel (10), the roller (18) moves to the inflection point of the irregular track (14). When the push rod (6) moves to the bottom of the irregular channel (10), the roller (18) moves to the top of the irregular track (14). At this time, the valve plate (4) has rotated 90°.

8. A frictionless double-seal ball valve according to claim 7, characterized in that, The lower side of the steering slider (12) is provided with a semi-circular keyway, and a guide key (19) is provided in the keyway with an interference fit. The rotating bracket (7) is provided with a through keyway corresponding to the guide key (19), and is clearance fitted with the guide key (19).

9. A frictionless double-seal ball valve according to claim 8, characterized in that, Limit switches (20) are respectively provided on the side of the guide body (13) at the bottom and top of the corresponding irregular track (14).

10. A frictionless double-seal ball valve according to claim 1, characterized in that, The rotating bracket is an ellipsoid with its major axis in the vertical direction.

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