Bidirectional compensation zero-friction butterfly valve

Abstract

The invention relates to the technical field of butterfly valves, and discloses a two-way compensation zero-friction butterfly valve which comprises a valve body, a hand wheel is arranged at the top of the valve body, the inner wall of the valve body is sleeved with a bearing cover, the inner wall of the valve body is sleeved with a valve rod nut, an inner cavity of the valve body is provided with a plane thrust ball bearing, and the inner wall of the valve body is movably sleeved with an upper valve rod. The bidirectional compensation zero-friction butterfly valve comprises an upper hand wheel, an upper valve rod, a guide force transmission connecting sleeve, a connecting piece and an oblique angle block, a guide reversing handle is arranged on the inner wall of the upper valve rod, a support is connected to the outer wall of the upper valve rod in a sleeving mode, and a filler is arranged on the outer wall of the upper valve rod. Therefore, the upper valve rod on the device drives the guide force transmission connecting sleeve to lift up and down in the inner cavity of the valve body; the guide force transmission connecting sleeve on the device makes contact with and is staggered with the T-shaped outer wall of the bevel block through the T-shaped groove in the outer wall, and the butterfly plate moves relatively.

Description

Technical Field

[0001] The present invention relates to the technical field of butterfly valves, and particularly to a two-way compensation zero-friction butterfly valve. Background Technique

[0002] A butterfly valve, also called a flap valve, is a simple-structured regulating valve. The butterfly valve used for the on-off control of the medium in a low-pressure pipeline refers to a valve in which the closing member, the valve flap or the butterfly plate, is a disc and rotates around the valve shaft to achieve opening and closing.

[0003] When the sealing surfaces of the butterfly plate and the valve seat of the existing eccentric butterfly valve are opened and closed, they directly contact and squeeze. For the sealing surfaces of the butterfly plate and the valve seat of the two-eccentric hard-sealing butterfly valve, the elastic sealing ring of the valve seat will generate a huge frictional force, which increases the torque during opening and closing; at the same time, when the sealing surfaces of the butterfly plate and the valve seat of the butterfly valve are opened and closed, the elastic sealing ring of the valve seat directly squeezes and contacts, and the sealing surfaces of the valve seat are worn during opening and closing, and the sealing surface of the valve seat is easily worn out, resulting in sealing surface leakage and reducing the service life of the valve; the sealing of the three-eccentric butterfly valve depends on the thrust of the actuator to seal. Therefore, for the three-eccentric butterfly valve with the same pressure and the same caliber, the diameter of the valve stem needs to be increased and the output torque of the actuator is large, and the cost is very high. Therefore, a two-way compensation zero-friction butterfly valve that solves the above problems is needed. Summary of the Invention

[0004] The present invention provides a two-way compensation zero-friction butterfly valve, which has the advantages of no friction, zero wear, and extended service life, and solves the problems raised in the above background technique.

[0005] The present invention provides the following technical solution: A two-way compensation zero-friction butterfly valve, including a valve body. A handwheel is provided at the top of the valve body. A bearing cover is sleeved on the inner wall of the valve body. A valve stem nut is sleeved on the inner wall of the valve body. A flat thrust ball bearing is provided in the inner cavity of the valve body. An upper valve stem is movably sleeved on the inner wall of the valve body. A guiding reversing handle is provided on the inner wall of the upper valve stem. A bracket is sleeved on the outer wall of the upper valve stem. A stuffing box is provided on the outer wall of the upper valve stem. A stuffing gland is provided at the top of the stuffing box. A connecting fixing pin is connected to the inner wall of the upper valve stem. A guiding force-transmitting connecting sleeve is sleeved on the outer wall of the upper valve stem. A gland is connected to the outer wall of the valve body. A spring is connected to the inner wall of the gland. A valve seat is connected to the outer wall of the gland. A bottom cover is installed at the bottom of the valve body. A sealing gasket is placed on the top of the bottom cover. A lower valve stem is connected to the top of the bottom cover. A positioning fulcrum sleeve is sleeved on the outer wall of the lower valve stem. A lower sliding sleeve is sleeved on the outer wall of the lower valve stem. A fixing screw is connected to the inner wall of the lower sliding sleeve. A connecting member is connected to the outer wall of the fixing screw. A butterfly plate is connected to the outer wall of the connecting member. An inclined angle block is provided on the outer wall of the butterfly plate.

[0006] As a preferred technical solution of the present invention, the spring is filled into the inner cavity of the valve seat, and the gland is connected to the valve seat following the spring.

[0007] As a preferred technical solution of the present invention, the positioning fulcrum sleeve is installed directly below the lower sliding sleeve, and the inner wall of the positioning fulcrum sleeve is adapted to the outer wall of the lower valve stem in size.

[0008] As a preferred technical solution of the present invention, the guiding and force - transmitting connecting sleeve is arranged at the central position of the valve body, and the upper valve stem extends through the inner cavity of the valve body to the guiding and force - transmitting connecting sleeve.

[0009] As a preferred technical solution of the present invention, a "T" - shaped groove is arranged on the outer wall of the guiding and force - transmitting connecting sleeve, and the bevel block is arranged in a "T" - shaped shape.

[0010] As a preferred technical solution of the present invention, a rubber pad is arranged on the outer wall of the butterfly plate, and the outer wall of the butterfly plate is adapted to the inner wall of the rubber pad in size.

[0011] The present invention has the following beneficial effects: 1. For this two - way compensation zero - friction butterfly valve, through the mutual cooperation of the handwheel, upper valve stem, guiding and force - transmitting connecting sleeve, connecting piece, and bevel block on the device, when the handwheel on the device rotates manually, while the upper valve stem on the device meshes with the valve stem nut in a threaded manner and moves up and down, thereby causing the upper valve stem on the device to drive the guiding and force - transmitting connecting sleeve to move up and down in the inner cavity of the valve body; enabling the guiding and force - transmitting connecting sleeve on the device to contact and displace with the "T" - shaped outer wall of the bevel block through the "T" - shaped groove on the outer wall, and making the butterfly plate move relatively, and further enabling the sealing surfaces of the butterfly plate and the valve seat to easily separate. When the sealing surfaces of the butterfly plate and the valve seat are separated, the medium in the pipeline can easily pass through the gap between the sealing surfaces. At this time, zero wear is not fully opened, and the pressure before the valve and the pressure after the valve are basically balanced. Only by easily rotating the guiding and reversing handle below the handwheel, the butterfly plate can be rotated to a position parallel to the flow channel, thereby realizing the full - open state of the butterfly valve without friction and zero wear.

[0012] 2. For this two - way compensation zero - friction butterfly valve, during the opening and closing of the valve, the sealing surfaces on the valve seat and the butterfly plate have zero friction during opening and closing, and there is no friction during disconnection and closing. This can solve the problems of short service life and large torque of the valve seat sealing surface and the butterfly plate sealing surface; at the same time, the resulting benefit is that the driving force of the actuator is greatly reduced, and the torque can be reduced to about one - third. For the components with matching dimensions with the driving device, such as the adapter plate, valve stem, bracket, etc. connected to the actuator, they can all be reduced accordingly, saving costs and extending the service life of the valve. Brief Description of the Drawings

[0013] Figure 1Schematic diagram of the three-dimensional structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged schematic diagram of the structure at position A in the present invention; Figure 3 For the present invention Figure 1 Enlarged schematic diagram of the structure at position B in the present invention; Figure 4 Schematic diagram of the butterfly plate structure of the present invention.

[0014] In the figure: 1. Valve body; 2. Handwheel; 3. Bearing cover; 4. Valve stem nut; 5. Flat thrust ball bearing; 6. Upper valve stem; 7. Guide and reversing handle; 8. Bracket; 9. Packing gland; 10. Packing device; 11. Connecting and fixing pin; 12. Guide and force transmission connecting sleeve; 13. Gland; 14. Spring; 15. Valve seat; 16. Bottom cover; 17. Sealing gasket; 18. Lower valve stem; 19. Positioning fulcrum sleeve; 20. Lower sliding sleeve; 21. Fixing screw; 22. Connecting piece; 23. Butterfly plate; 24. Inclined angle block; 25. Rubber pad. Detailed implementation manners

[0015] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0016] Please refer to Figures 1-4, a two-way compensation zero-friction butterfly valve, comprising a valve body 1, a handwheel 2 is provided at the top of the valve body 1, a bearing cover 3 is sleeved on the inner wall of the valve body 1, a valve stem nut 4 is sleeved on the inner wall of the valve body 1, a flat thrust ball bearing 5 is provided in the inner cavity of the valve body 1, an upper valve stem 6 is movably sleeved on the inner wall of the valve body 1, a guiding and reversing handle 7 is provided on the inner wall of the upper valve stem 6, a bracket 8 is sleeved on the outer wall of the upper valve stem 6, a stuffing box 10 is provided on the outer wall of the upper valve stem 6, a stuffing gland 9 is provided at the top of the stuffing box 10, a connecting and fixing pin 11 is connected to the inner wall of the upper valve stem 6, a guiding and force-transmitting connecting sleeve 12 is sleeved on the outer wall of the upper valve stem 6, a gland 13 is connected to the outer wall of the valve body 1, a spring 14 is connected to the inner wall of the gland 13, a valve seat 15 is connected to the outer wall of the gland 13, a bottom cover 16 is installed at the bottom of the valve body 1, a sealing gasket 17 is placed on the top of the bottom cover 16, a lower valve stem 18 is connected to the top of the bottom cover 16, a positioning fulcrum sleeve 19 is sleeved on the outer wall of the lower valve stem 18, a lower sliding sleeve 20 is sleeved on the outer wall of the lower valve stem 18, a fixing screw 21 is connected to the inner wall of the lower sliding sleeve 20, a connecting member 22 is connected to the outer wall of the fixing screw 21, a butterfly plate 23 is connected to the outer wall of the connecting member 22, and an inclined block 24 is provided on the outer wall of the butterfly plate 23. By the mutual cooperation of the handwheel 2, the upper valve stem 6 and the guiding and force-transmitting connecting sleeve 12 on the device, when the handwheel 2 on the device rotates manually, while the upper valve stem 6 on the device is in threaded engagement with the valve stem nut 4, it moves up and down, so that the upper valve stem 6 on the device drives the guiding and force-transmitting connecting sleeve 12 to move up and down in the inner cavity of the valve body 1.

[0017] In a preferred embodiment, the spring 14 is filled into the inner cavity of the valve seat 15, and the gland 13 is connected to the valve seat 15 after the spring 14. By filling the spring 14 into the inner cavity of the valve seat 15 on the device, the spring 14 on the device is first installed with the valve seat 15, and the gland 13 is installed with the valve seat 15 by using screws, so that the spring 14, the gland 13 and the valve seat 15 on the device complete the installation work.

[0018] In a preferred embodiment, the positioning fulcrum sleeve 19 is installed directly below the lower sliding sleeve 20, and the inner wall of the positioning fulcrum sleeve 19 is adapted to the outer wall of the lower valve stem 18. By installing the positioning fulcrum sleeve 19 directly below the lower sliding sleeve 20 on the device, before the lower sliding sleeve 20 on the device is sleeved with the lower valve stem 18, the positioning fulcrum sleeve 19 is placed directly below the lower sliding sleeve 20, and the lower valve stem 18 enters the inner cavity of the valve body 1 from bottom to top, so that the lower valve stem 18 on the device can be installed in the inner cavity of the valve body 1, and further the position of the butterfly plate 23 is adjusted on the right side of the lower valve stem 18.

[0019] In a preferred embodiment, the guiding force transmission connecting sleeve 12 is arranged at the central position of the valve body 1, and the upper valve stem 6 passes through the inner cavity of the valve body 1 and extends to the guiding force transmission connecting sleeve 12. By arranging the guiding force transmission connecting sleeve 12 at the central position of the valve body 1, the upper valve stem 6 on the device is connected to the guiding force transmission connecting sleeve 12 by means of the connecting fixing pin 11. And the guiding force transmission connecting sleeve 12 is arranged at the center of the valve body 1, so that the guiding force transmission connecting sleeve 12 on the device no longer shakes and cooperates with the butterfly plate 23 for operation.

[0020] In a preferred embodiment, the outer wall of the guiding force transmission connecting sleeve 12 is provided with a "T"-shaped groove, and the bevel block 24 is arranged in a "T" shape. By providing the "T"-shaped groove on the outer wall of the guiding force transmission connecting sleeve 12 on the device, the butterfly plate 23 on the device is installed on the right side of the guiding force transmission connecting sleeve 12, and the butterfly plate 23 is lapped with the outer wall of the guiding force transmission connecting sleeve 12 by means of the bevel block 24. Thus, when the guiding force transmission connecting sleeve 12 on the device moves up and down, and by using the contact and dislocation between the "T"-shaped groove and the "T" shape, the angle of the butterfly plate 23 can change slightly.

[0021] In a preferred embodiment, a rubber pad 25 is provided on the outer wall of the butterfly plate 23, and the size of the outer wall of the butterfly plate 23 is adapted to the size of the inner wall of the rubber pad 25. By providing the rubber pad 25 on the outer wall of the butterfly plate 23 on the device, the rubber pad 25 on the device is annularly arranged on the outer wall of the butterfly plate 23, and the rubber pad 25 is completely installed on the outer wall of the butterfly plate 23. Thus, the butterfly plate 23 contacts the surface of the valve seat 15 by means of the rubber pad 25.

[0022] Working principle: First, through the mutual cooperation of the handwheel 2, upper valve stem 6, guiding force transmission connecting sleeve 12, connecting piece 22, and bevel block 24 on the device, when the handwheel 2 on the device rotates manually, the upper valve stem 6 on the device moves up and down while being threadedly engaged with the valve stem nut 4. Thus, the upper valve stem 6 on the device drives the guiding force transmission connecting sleeve 12 to move up and down in the inner cavity of the valve body 1; the guiding force transmission connecting sleeve 12 on the device uses the contact and dislocation between the "T"-shaped groove on the outer wall and the "T"-shaped outer wall of the bevel block 24, and makes the butterfly plate 23 move relatively, thereby easily separating the sealing surface of the butterfly plate 23 from the sealing surface of the valve seat 15. When the sealing surfaces of the butterfly plate 23 and the valve seat 15 are separated, the medium in the pipeline can easily pass through the gap between the sealing surfaces. At this time, zero wear has not been fully opened, and the pressure before the valve and the pressure after the valve are basically balanced. Only by easily rotating the guiding reversing handle 7 below the handwheel 2, the butterfly plate 23 can be rotated to a position parallel to the flow channel, thus realizing the full opening of the butterfly valve without friction and zero wear. Then, when the valve is opened and closed, the sealing surface on the valve seat 15 and the sealing surface of the butterfly plate 23 have zero friction during opening and closing, and there is no friction during disengagement and closing. This can solve the problems of short service life and large torque of the sealing surfaces of the valve seat 15 and the butterfly plate 23; at the same time, the resulting benefit is that the driving force of the actuator is greatly reduced, and the torque can be reduced to about one-third. All components with dimensions matching the driving device, such as the adapter plate, valve stem, and bracket 8 connected to the actuator, can be correspondingly reduced, saving costs and extending the service life of the valve.

[0023] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0024] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A two-way compensation zero-friction butterfly valve, comprising (1), characterized in that: The (1) comprises a valve body (1), characterized in that: a hand wheel (2) is provided on the top of the valve body (1), a bearing cover (3) is sleeved on the inner wall of the valve body (1), a valve stem nut (4) is sleeved on the inner wall of the valve body (1), a plane thrust ball bearing (5) is provided in the inner cavity of the valve body (1), an upper valve stem (6) is movably sleeved on the inner wall of the valve body (1), a guide reversing handle (7) is provided on the inner wall of the upper valve stem (6), a bracket (8) is sleeved on the outer wall of the upper valve stem (6), a stuffing device (10) is provided on the outer wall of the upper valve stem (6), a stuffing pressure plate (9) is provided on the top of the stuffing device (10), a connecting fixing pin (11) is connected to the inner wall of the upper valve stem (6), a guide force transmission connecting sleeve (12) is sleeved on the outer wall of the upper valve stem (6), and the valve body The outer wall of the valve body (1) is connected to a gland (13), the inner wall of the gland (13) is connected to a spring (14), the outer wall of the gland (13) is connected to a valve seat (15), a bottom cover (16) is installed at the bottom of the valve body (1), a sealing gasket (17) is placed on the top of the bottom cover (16), the top of the bottom cover (16) is connected to a lower valve stem (18), the outer wall of the lower valve stem (18) is sleeved with a positioning fulcrum sleeve (19), the outer wall of the lower valve stem (18) is sleeved with a lower sliding sleeve (20), the inner wall of the lower sliding sleeve (20) is connected to a fixing screw (21), the outer wall of the fixing screw (21) is connected to a connecting piece (22), the outer wall of the connecting piece (22) is connected to a butterfly plate (23), and the outer wall of the butterfly plate (23) is provided with a bevel block (24).

2. A two-way compensation zero-friction butterfly valve according to claim 1, characterized in that: The spring (14) is filled into the inner cavity of the valve seat (15), and the gland (13) is connected to the valve seat (15) following the spring (14).

3. A two-way compensation zero-friction butterfly valve according to claim 1, characterized in that: The positioning support sleeve (19) is installed directly below the lower sliding sleeve (20), and the inner wall of the positioning support sleeve (19) is matched in size to the outer wall of the lower valve stem (18).

4. A two-way compensation zero-friction butterfly valve according to claim 1, characterized in that: The guide force transmission connection sleeve (12) is arranged at the center position of the valve body (1), and the upper valve stem (6) passes through the inner cavity of the valve body (1) and extends to the guide force transmission connection sleeve (12).

5. A two-way compensation zero-friction butterfly valve according to claim 1, characterized in that: The outer wall of the guide force transmission connection sleeve (12) is provided with a "T"-shaped groove, and the bevel block (24) is arranged in a "T" shape.

6. A two-way compensation zero-friction butterfly valve according to claim 1, characterized in that: The outer wall of the butterfly plate (23) is provided with a rubber pad (25), and the size of the outer wall of the butterfly plate (23) is matched with the size of the inner wall of the rubber pad (25).

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