Self-balancing variable-pressure butterfly valve

Abstract

The self-balancing variable-pressure butterfly valve comprises a valve body and a valve clack rotationally installed in the valve body, the two ends of the valve body along the axis are connected with an inlet pipe and an outlet pipe respectively, the top end of the valve clack rotationally penetrates out of the valve body in the radial direction of the valve body, the valve body is connected with an adjusting pipe, and a hand wheel is rotationally installed at the other end of the adjusting pipe. The end, penetrating out of the valve body, of the valve clack is connected with a connecting column, the hand wheel is connected with a rotating cylinder rotationally arranged in the adjusting pipe in a penetrating mode, a locking device is arranged between the connecting column and the rotating cylinder, the connecting column is fixedly sleeved with a limiting plate, the limiting plate is connected with two limiting columns, and two limiting arc grooves are symmetrically formed in the side, away from the hand wheel, of the rotating cylinder. The two limiting columns are slidably arranged in the two limiting arc grooves correspondingly, and compressed springs are connected between the side walls of the ends of the two limiting arc grooves and the limiting columns. The butterfly valve has the effects that the flow of fluid passing through the butterfly valve is adjusted, so that the fluid flowing out of the butterfly valve under the non-full fluid condition can stably flow, and the interruption condition is avoided.

Description

A self-balancing variable pressure butterfly valve Technical Field

[0001] This application relates to the field of valve technology, and in particular to a self-balancing variable pressure butterfly valve. Background Technology

[0002] A butterfly valve is a simple regulating valve primarily used for on / off control of low-pressure pipeline media. The closing element (valve disc or butterfly plate) of a butterfly valve is disc-shaped and opens and closes by rotating around the valve shaft. It mainly functions as a shut-off and throttling device in pipeline systems and is suitable for controlling various types of fluids, including air, water, steam, various corrosive media, slurry, oil, liquid metals, and radioactive media.

[0003] Generally, a butterfly valve is fully open when the valve disc is rotated 90°, at which point the fluid flow rate is at its maximum. In actual use, operators will keep the butterfly valve partially open according to the required outflow rate to adjust the fluid flow and velocity. However, in most cases, the fluid entering the butterfly valve cannot maintain a constant flow rate. When the butterfly valve is not fully open, this will cause the fluid discharged from the valve to be intermittent, resulting in a continuous flow that is difficult to collect and causes fluid flow obstruction. Furthermore, the intermittent fluid flow will frequently cause significant pressure differences on both sides of the valve disc, reducing the valve disc's lifespan. Summary of the Invention

[0004] In order to improve the structure of the butterfly valve so that the butterfly valve can change the opening state of the valve disc in a timely manner according to the change of fluid velocity when the fluid entering the butterfly valve changes, and ensure the continuity of the fluid flowing out of the butterfly valve, this application provides a self-balancing variable pressure butterfly valve.

[0005] The self-balancing variable pressure butterfly valve provided in this application adopts the following technical solution:

[0006] A self-balancing variable pressure butterfly valve includes a valve body and a valve disc rotatably mounted inside the valve body with its edge sized to fit the inner wall of the valve body. An inlet pipe and an outlet pipe are integrally connected to both ends of the valve body along its axis. The top of the valve disc rotatably extends through the valve body radially. An adjusting pipe is integrally connected to the valve body at the point where the valve disc extends through. A handwheel for driving the valve disc is rotatably mounted at the other end of the adjusting pipe. A connecting post is connected to one end of the valve disc extending through the valve body. A rotating cylinder rotatably passes through the adjusting pipe and is connected to the handwheel. A locking device is provided between the connecting post and the rotating cylinder. A limiting plate is fixedly sleeved on the connecting post, and two limiting posts are integrally connected to the limiting plate near the rotating cylinder. Two limiting arc grooves are symmetrically formed on the side of the rotating cylinder away from the handwheel. The two limiting posts are slidably disposed within the two limiting arc grooves, and a compression spring is connected between the limiting post and the end sidewall of each limiting arc groove.

[0007] Optionally, the locking device includes a slide cylinder that is slidably engaged in the rotating cylinder along the axial direction and a button that is rotatably connected to the end of the slide cylinder away from the connecting post. The button slides through the handwheel along the axis and a positioning structure is provided between the button and the handwheel to fix the position of the button along the axial direction between the button and the handwheel. The connecting post is a prism, and the end of the slide cylinder away from the button has a prism hole that matches the size of the prism, and the prism slides through the prism hole.

[0008] Optionally, the positioning structure includes two positioning slots that are perpendicular to each other in the lateral direction and located at the center of the handwheel, a positioning rod that is integrally connected to the button in the radial direction, and springs that abut against the bottom of the slide and the rotating cylinder at both ends respectively. The two positioning slots have the same lateral dimension and the slot depth increases sequentially. The two ends of the positioning rod extend out of the button in the length direction and are dimensionally matched with the two positioning slots.

[0009] Optionally, the limiting plate is rotatably engaged with the inner wall of the adjusting tube.

[0010] Optionally, a bearing is rotatably embedded in the valve body, and the end of the connecting column near the valve disc is fixedly sleeved with the bearing.

[0011] In summary, this application includes at least one of the following beneficial technical effects:

[0012] This application improves the structure of the butterfly valve, enabling the butterfly valve to self-balance and adjust the opening degree of the valve disc according to the real-time flow of the fluid when it is not fully open, so as to ensure that the fluid flowing out of the butterfly valve is more stable and will not be intermittent.

[0013] This application has a simple structure and is easy to operate, has high practical applicability, and has low manufacturing cost, making it suitable for mass production. Attached Figure Description

[0014] Figure 1 is a schematic diagram of the overall structure of a self-balancing variable pressure butterfly valve according to this application.

[0015] Figure 2 is a cross-sectional view of point AA in Figure 1.

[0016] Figure 3 is a schematic diagram of the internal structure of a self-balancing variable pressure butterfly valve according to this application.

[0017] Figure 4 is an exploded view of the internal structure of a self-balancing variable pressure butterfly valve according to this application.

[0018] Figure 5 is a bottom structural view of the rotary cylinder of a self-balancing variable pressure butterfly valve according to this application.

[0019] Figure 6 is an enlarged view of point A in Figure 4.

[0020] Explanation of reference numerals in the attached drawings: 1. Valve body; 11. Inlet pipe; 12. Outlet pipe; 13. Adjusting pipe; 2. Valve disc; 21. Connecting column; 22. Limiting plate; 221. Limiting column; 3. Handwheel; 31. Rotary cylinder; 311. Limiting arc groove; 312. Compression spring; 4. Locking device; 41. Slide cylinder; 411. Prism hole; 42. Button; 5. Positioning structure; 51. Positioning slot; 52. Positioning rod; 53. Spring; 6. Bearing. Detailed Implementation

[0021] The present application will be further described in detail below with reference to Figures 1-6.

[0022] This application discloses a self-balancing variable pressure butterfly valve.

[0023] Referring to Figures 1 and 2, a self-balancing variable pressure butterfly valve includes a valve body 1 and a valve disc 2 rotatably mounted inside the valve body 1. The valve disc 2 is located in the middle of the valve body 1 along its extension direction and is disc-shaped. The edge of the valve disc 2 is dimensionally matched with the inner wall of the valve body 1 so that the valve disc 2 can completely block the fluid when closed. Both ends of the valve body 1 along its axis have openings communicating with the interior, and are integrally connected to an inlet pipe 11 and an outlet pipe 12, respectively. Furthermore, an adjusting pipe 13, coaxial with the valve disc 2, is integrally provided on the valve body 1 at its middle position along a direction perpendicular to the extension direction. The central axis of the valve disc 2 rotatably passes through the valve body 1 and extends into the adjusting pipe 13, and is connected to a connecting post 21.

[0024] The other end of the regulating pipe 13 is rotatably fitted with a handwheel 3 for easy hand gripping and rotation. A rotating drum 31 is integrally connected to the side of the handwheel 3 closest to the valve body 1. The rotating drum 31 extends into the regulating pipe 13 and is secured to the connecting column 21 by a locking device 4. When the rotating drum 31 is locked to the connecting column 21, the operator can rotate the handwheel 3 to rotate the valve disc 2, which is fixedly connected to the connecting column 21, thereby adjusting the opening range of the valve disc 2.

[0025] Preferably, to enable the handwheel 3 to more accurately adjust the rotation angle of the valve disc 2, a rotary drum 31 can be designed to be threadedly connected to the adjusting pipe 13. This structure can also prevent the handwheel 3 from rotating spontaneously when the valve disc 2 is subjected to excessive fluid impact, thus avoiding changes in the valve opening range, and has the effects of adjustment protection and limit locking.

[0026] Referring to Figures 3 and 5, further, a limiting plate 22 is fitted onto the connecting column 21, and two limiting columns 221 are symmetrically and integrally connected on the side of the limiting plate 22 away from the valve disc 2. Two limiting arc grooves 311 are symmetrically opened on the side of the rotating cylinder 31 near the limiting plate 22, and the two limiting columns 221 are slidably disposed within the two limiting arc grooves 311 respectively. Simultaneously, a compression spring 312 is fixedly installed on the inner wall of one end of the limiting arc groove 311, and the other end of the compression spring 312 is always pressed against the side wall of the limiting column 221.

[0027] When valve disc 2 is not fully open, it will be subjected to excessive impact force intermittently due to the influence of fluid waves. At this time, the limiting post 221 will slide in the limiting arc groove 311 and, under the action of the compression spring 312, drive valve disc 2 to change its opening range, thereby slowing down the flow rate of the fluid passing through this point, making the fluid flow more stable and continuous after passing through valve disc 2.

[0028] Furthermore, this structure can be adjusted in real time according to the fluid conditions, has self-balancing capabilities, does not require operator control, and saves manpower.

[0029] Preferably, the limiting plate 22 and the inner wall of the regulating pipe 13 are rotatably fitted so that the limiting plate 22 and the valve disc 2 connected to the limiting plate 22 rotate more smoothly, can withstand greater fluid impact force, and improve the system stability when the butterfly valve is working.

[0030] Referring to Figures 3 and 4, specifically, the locking device 4 includes a slide cylinder 41 that is axially slidably engaged within the rotating cylinder 31, and a button 42 rotatably connected at one end to the top of the slide cylinder 41. The other end of the button 42 passes through the handwheel 3 for easy manual operation. The end of the connecting post 21 near the slide cylinder 41 has a prismatic structure, and the other end of the slide cylinder 41 away from the button 42 has a prismatic hole 411 that matches the shape of the connecting post 21. A positioning structure 5 is provided between the button 42 and the handwheel 3, used to drive the slide cylinder 41 to move along the axis within the rotating cylinder 31 to a predetermined position by operating the button 42.

[0031] When button 42 drives slide cylinder 41, causing connecting post 21 to enter slide cylinder 41, valve disc 2 will rotate synchronously with handwheel 3. At this time, valve disc 2 can be opened and closed quickly, and at the same time, it can be ensured that no fluid leakage will occur when valve disc 2 is closed.

[0032] When the connecting column 21 is separated from the slide cylinder 41, the valve disc 2 will not rotate synchronously with the handwheel 3. At this time, the valve disc 2 will shake when subjected to fluid impact force, thus realizing the overall fluid self-balancing function of the butterfly valve.

[0033] Referring to Figures 4 and 6, specifically, the positioning structure 5 includes two mutually perpendicular positioning slots 51 located at the center of the handwheel 3, a positioning rod 52 integrally connected radially to the button 42, and springs 53 whose two ends respectively abut against the bottom of the slide cylinder 41 and the rotating cylinder 31. The depth of the two positioning slots 51 increases sequentially along the vertical direction, and both ends of the positioning rod 52 on the button 42 extend beyond the button 42 along the length direction and are adapted to the lateral dimensions of the two positioning slots 51.

[0034] Button 42, when rotated and pressed, can enter into two positioning slots 51. When the positioning rod 52 is in two positioning slots 51 of different depths, the pressure from button 42 will cause the slide cylinder 41 to occupy different axial positions within the rotating cylinder 31, thereby selecting whether the slide cylinder 41 is connected to the connecting post 21 and rotates synchronously. The spring 53 serves to reset button 42, facilitating quick slot changing for the positioning rod 52.

[0035] Referring to Figures 2 and 4, a bearing 6 is rotatably embedded on the valve body 1, and the connecting column 21 is fixedly sleeved with the bearing 6 at one end near the valve disc 2, so as to make the valve disc 2 more flexible when rotating, so as to avoid greater resistance from the system itself when the valve disc 2 performs self-balancing adjustment.

[0036] The implementation principle of a self-balancing variable pressure butterfly valve in this application embodiment is as follows:

[0037] When opening or closing the valve body 1, rotate and press button 42 to move the slide cylinder 41 down to the position where the connecting post 21 extends into the prism hole 411. At this time, since the cross-section of the prism hole 411 is prismatic and the slide cylinder 41 and the rotating cylinder 31 are axially slidably engaged, the rotating cylinder 31, the slide cylinder 41, the connecting post 21, and the valve disc 2 are in a relatively locked state.

[0038] When the handwheel 3 is turned, the valve disc 2 can be driven to rotate synchronously, so as to quickly open and close the valve body 1, and ensure that the valve disc 2 will not leak when the butterfly valve is closed.

[0039] When a partially open fluid passage is formed within the valve, rotate and press button 42 into another positioning slot 51. At this time, the slide cylinder 41 separates from the connecting column 21. Affected by the limiting column 221, the valve disc 2 can rotate within a predetermined angle range to adapt to the flow rate of the fluid at different times, ensuring that the fluid flowing out of the butterfly valve always flows smoothly.

[0040] The compression spring 312 here can ensure that the valve disc 2 can be reset, so as to achieve self-balancing adjustment according to the actual fluid conditions.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A self-balancing variable pressure butterfly valve, comprising a valve body (1) and a valve disc (2) rotatably mounted inside the valve body (1) with its edge matching the dimensions of the inner wall of the valve body (1), wherein an inlet pipe (11) and an outlet pipe (12) are integrally connected to both ends of the valve body (1) along its axis, the top end of the valve disc (2) rotatably protrudes from the valve body (1) along the radial direction of the valve body (1), and an adjusting pipe (13) is integrally connected to the valve body (1) at the protrusion position of the valve disc (2), and a handwheel (3) for driving the valve disc (2) to rotate is rotatably mounted at the other end of the adjusting pipe (13), characterized in that: The valve disc (2) extends out of the valve body (1) and is connected to a connecting post (21). The handwheel (3) is connected to a rotating cylinder (31) that rotates through the regulating pipe (13). A locking device (4) is provided between the connecting post (21) and the rotating cylinder (31). A limiting plate (22) is fixedly sleeved on the connecting post (21). Two limiting posts (221) are integrally connected to the limiting plate (22) on the side near the rotating cylinder (31). Two limiting arc grooves (311) are symmetrically opened on the side of the rotating cylinder (3) away from the handwheel (3). The two limiting posts (221) are slidably disposed in the two limiting arc grooves (311). A compression spring (312) is connected between the end sidewall of the two limiting arc grooves (311) and the limiting post (221).

2. The self-balancing variable pressure butterfly valve according to claim 1, characterized in that: The locking device (4) includes a slide cylinder (41) that is slidably locked in the rotating cylinder (31) along the axis and a button (42) that is rotatably connected to one end of the slide cylinder (41) away from the connecting post (21). The button (42) slides through the handwheel (3) along the axis and a positioning structure (5) is provided between the button (42) and the handwheel (3) to fix the position of the button (42) between the handwheel (3) along the axis. The connecting post (21) is a prism. The slide cylinder (41) has a prism hole (411) that matches the size of the prism at one end away from the button (42), and the prism slides through the prism hole (411).

3. The self-balancing variable pressure butterfly valve according to claim 2, characterized in that: The positioning structure (5) includes two positioning slots (51) that are opened at the center of the handwheel (3) and are perpendicular to each other in the lateral direction, a positioning rod (52) that is integrally connected to the button (42) in the radial direction, and a spring (53) whose two ends respectively abut against the bottom of the slide (41) and the rotating cylinder (31). The two positioning slots (51) have the same lateral dimension and the slot depth increases sequentially. The two ends of the positioning rod (52) extend out of the button (42) in the length direction and are sized to fit the two positioning slots (51).

4. The self-balancing variable pressure butterfly valve according to claim 3, characterized in that: The limiting plate (22) and the inner wall of the adjusting tube (13) are rotated together.

5. A self-balancing variable pressure butterfly valve according to claim 4, characterized in that: The valve body (1) is rotatably fitted with a bearing (6), and the connecting column (21) is fixedly sleeved together with the bearing (6) at one end near the valve disc (2).

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