Rotary valve rod corrugated pipe sealing device

Abstract

The utility model discloses a rotary valve rod bellows sealing device which comprises a valve body, an input cavity and an output cavity are formed in the valve body, a valve clack and a lower valve rod are arranged in the output cavity, the lower valve rod is sleeved with a piston sleeve in a sliding mode, an annular limiting groove is formed in the inner wall of the piston sleeve, and the valve clack and the lower valve rod are arranged in the annular limiting groove. An annular limiting groove is formed in the lower valve rod, a telescopic spring is installed in the annular limiting groove, an abutting ring is installed in the telescopic spring in a sliding mode, an annular air bag is installed on the valve clack, a circular groove is formed in the valve clack, a plurality of connecting holes are formed in the circular groove, the lower valve rod is fixedly sleeved with an isolation sleeve, and the valve body is connected with a valve pipe through an installation component. A corrugated pipe is arranged in the valve pipe, and the upper valve rod is connected with a hand wheel through an indicating component. The valve has the advantages that the annular air bag on the valve clack is inflated, the valve is further sealed, the sealing performance of the valve is improved, and medium leakage is effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of stop valves, in particular to a rotary valve stem bellows sealing device. Background Art

[0002] Bellows globe valve is a valve that uses bellows as a sealing element. This valve has a compact structure, flexible operation, and easy maintenance. Its unique bellows design can effectively prevent the medium from leaking along the valve stem. It is widely used in the petroleum, chemical, pharmaceutical and other industries and is a key component for fluid control.

[0003] There is a certain narrow gap at the connection between the valve disc and the valve structure of the existing bellows stop valve. After a long period of operation, the gap will gradually expand due to repeated flushing of the fluid and friction of opening and closing the valve, thereby affecting the sealing of the valve. Utility Model Content

[0004] The purpose of the utility model is to solve the following shortcomings in the prior art and to propose a rotary valve stem bellows sealing device.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] The rotary valve stem bellows sealing device includes a valve body, which is characterized in that an input chamber and an output chamber connected to the outside are provided inside the valve body, a valve disc and a lower valve stem are provided in the output chamber, a piston sleeve fixedly connected to the valve disc is vertically slidably sleeved on the surface of the lower valve stem, an annular limiting groove is provided on the inner wall of the piston sleeve, a telescopic spring is fixedly installed on the bottom wall of the annular limiting groove, a pressure ring fixedly connected to the surface of the lower valve stem is vertically slidably installed in the telescopic spring, and the outer ring wall of the pressure ring is in sliding sealing contact with the wall of the annular limiting groove. The valve disc is fixedly mounted with an annular airbag, the inside of the valve disc is provided with a circular groove connected with the piston sleeve, the wall of the circular groove is circumferentially provided with a plurality of connecting holes connected with the annular airbag, an isolation sleeve is fixedly sleeved on the lower valve stem, the valve body is fixedly connected with a valve pipe connected with the output chamber through a mounting component, a bellows is vertically slidably provided in the valve pipe, one end of the bellows is fixedly connected to the lower valve stem, and the other end is fixedly connected to the upper valve stem, and the upper valve stem is fixedly connected to a handwheel through an indicating component.

[0007] In order to better achieve the above-mentioned purpose, the utility model adopts a further technical solution: the indicating component includes a lower circular table, which is fixedly connected to the valve tube through an installation component, and the lower circular table is fixedly connected to the upper circular table through two connecting columns, and the two connecting columns are provided with rectangular strips on the side close to each other, and the surfaces of the lower circular table and the upper circular table are both provided with through-openings, and the two through-openings are vertically slidably installed with a pressure rod whose bottom end is fixedly connected to the top of the upper valve stem, and the pressure rod is fixedly sleeved with an anti-rotation block with a T-shaped longitudinal section, and the left and right ends of the anti-rotation block are provided with sliding openings, and the two rectangular strips are respectively located in the two sliding openings, and their surfaces are in sliding contact with the sliding opening wall, and a thread is provided on the surface of the pressure rod part.

[0008] In order to better achieve the above-mentioned purpose, the present invention adopts a further technical solution: the upper surface of the upper circular table is provided with a rotating groove connected to the through-opening, a rotating shaft is rotatably installed in the rotating groove, two annular sliding grooves are provided on the surface of the rotating shaft, and multiple ball bearings are provided in the two annular sliding grooves in a circular shape. The upper surface of the rotating shaft is fixedly connected to the handwheel, and the inner wall of the rotating shaft is threadedly sleeved on the pressure rod.

[0009] In order to better achieve the above purpose, the present invention adopts a further technical solution: the mounting component includes two flanges of different sizes, the flange close to the valve body is used to connect the valve body and the valve pipe, and the other flange is used to connect the valve pipe and the indicating component.

[0010] In order to better achieve the above purpose, the present invention adopts a further technical solution: a compressible filler is provided inside the valve tube, and the filler is made of graphene. The filler fills the gap between the upper valve stem surface and the inner wall of the valve tube to prevent medium leakage.

[0011] In order to better achieve the above-mentioned purpose, the present invention adopts a further technical solution: the top of the isolation sleeve and the bottom of the upper valve stem are both inverted sealing designs to enhance the overall sealing performance.

[0012] The advantages of the utility model are:

[0013] When the valve is closed, the lower valve stem will press the telescopic spring through the pressure ring to drive the valve disc downward until the valve disc blocks the input chamber, and the lower valve stem will continue to move downward. At this time, the telescopic spring begins to be compressed under the pressure of the pressure ring, and the gas in the piston sleeve is gradually discharged into the annular airbag through the circular groove and the connecting hole by the lower valve stem. At this time, the annular airbag begins to expand and fill the gap between the valve disc and the inner wall of the input chamber, further sealing the valve, improving the sealing performance of the valve and effectively preventing medium leakage.

[0014] The bellows is arranged inside the valve pipe. When the valve is opened, the lower valve stem drives the isolation sleeve to move upward. At this time, the isolation sleeve will block the valve pipe mouth. During use, the bellows does not come into direct contact with the fluid, protecting the bellows from fluid erosion. The anti-rotation block in the indicator component can not only show the user the position of the valve, but also play a limiting role to prevent the bellows from exceeding the limit of extension or compression due to excessive rotation of the handwheel, thereby improving the service life of the bellows.

[0015] The large flange can disassemble the connection between the valve body and the valve pipe, and the small flange can disassemble the connection between the indicating component and the valve pipe. In addition, a thread is provided in the middle of the valve pipe above the bellows, where the valve pipe can be disassembled, making it convenient to disassemble the entire sealing device for inspection and maintenance.

[0016] There are two annular grooves on the surface of the shaft, and multiple balls are set in the grooves, which convert the sliding friction between the shaft and the groove into rolling friction, greatly reducing the friction and making it easier for the user to rotate the handwheel to control the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the rotary valve stem bellows sealing device proposed in the utility model;

[0018] Figure 2 This is a front cross-sectional structural diagram of the rotary valve stem bellows sealing device proposed in the utility model;

[0019] Figure 3 for Figure 2 A magnified view of the structure at center A;

[0020] Figure 4 for Figure 2 A magnified view of the structure at point B in the middle;

[0021] Figure 5 This is a partial three-dimensional structural diagram of the indicating component and the mounting component in the rotary valve stem bellows sealing device proposed by the present invention;

[0022] Figure 6 This is a partial three-dimensional structural diagram of the rotating shaft and the pressure rod in the rotary valve stem bellows sealing device proposed by the present invention;

[0023] In the figure: 1 valve body, 2 input chamber, 3 output chamber, 4 valve disc, 5 piston sleeve, 6 lower valve stem, 7 annular limit groove, 8 pressure ring, 9 telescopic spring, 10 connecting hole, 11 annular airbag, 12 isolation sleeve, 13 bellows, 14 valve tube, 15 upper valve stem, 16 lower round table, 17 connecting column, 18 upper round table, 19 pressure rod, 20 anti-rotation block, 21 rotating shaft, 22 handwheel, 23 flange, 24 packing. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0025] Reference Figures 1-6 As shown, the rotary valve stem bellows sealing device includes a valve body 1, an input chamber 2 and an output chamber 3 connected to the outside are opened inside the valve body 1, a valve disc 4 and a lower valve stem 6 are arranged in the output chamber 3, a piston sleeve 5 fixedly connected to the valve disc 4 is vertically slidably sleeved on the surface of the lower valve stem 6, an annular limiting groove 7 is opened on the inner wall of the piston sleeve 5, a telescopic spring 9 is fixedly installed on the bottom wall of the annular limiting groove 7, a pressure ring 8 fixedly connected to the surface of the lower valve stem 6 is vertically slidably installed in the telescopic spring 9, the outer ring wall of the pressure ring 8 is in sliding sealing contact with the groove wall of the annular limiting groove 7, and the valve disc 4 is in sliding sealing contact with the outer ring wall of the annular limiting groove 7. An annular airbag 11 is fixedly installed on the surface, and a circular groove connected to the piston sleeve 5 is opened inside the valve disc 4. The circular groove wall is circumferentially opened with multiple connecting holes 10 connected to the annular airbag 11. An isolation sleeve 12 is fixedly sleeved on the lower valve stem 6. The valve body 1 is fixedly connected to a valve tube 14 connected to the output chamber 3 through a mounting component. A bellows 13 is vertically slidably provided in the valve tube 14. One end of the bellows 13 is fixedly connected to the lower valve stem 6, and the other end is fixedly connected to the upper valve stem 15. The upper valve stem 15 is fixedly connected to a handwheel 22 through an indicating component.

[0026] When the valve is closed, the bellows 13 moves downward to drive the lower valve stem 6 downward. The lower valve stem 6 will press the telescopic spring 9 through the pressure ring 8 to drive the valve disc 4 downward until the valve disc 4 blocks the input chamber 2, and continue to move the lower valve stem 6 downward. At this time, the telescopic spring 9 begins to be compressed under the pressure of the pressure ring 8, and the gas in the piston sleeve 5 is gradually discharged into the annular airbag 11 by the lower valve stem 6 through the circular groove and the connecting hole 10. At this time, the annular airbag 11 begins to expand and fill the gap between the valve disc 4 and the inner wall of the input chamber 2, further sealing the valve. When the valve is opened, the bellows 13 moves upward to drive the lower valve stem 6 upward. The upward movement of the lower valve stem 6 will re-suck the air in the annular airbag 11 into the piston sleeve 5, and then drive the entire piston sleeve 5 and the valve disc 4 to move upward through the pressure ring 8, thereby opening the valve.

[0027] The indicating component includes a lower circular table 16, which is fixedly connected to the valve tube 14 through a mounting component. The lower circular table 16 is fixedly connected to the upper circular table 18 through two connecting columns 17. The two connecting columns 17 are provided with rectangular strips on the side close to each other. The surfaces of the lower circular table 16 and the upper circular table 18 are provided with through-holes, and a pressure rod 19 with a bottom end fixedly connected to the top of the upper valve stem 15 is vertically slidably installed in the two through-holes. An anti-rotation block 20 with a T-shaped longitudinal section is fixedly sleeved on the pressure rod 19. Sliding openings are provided at both ends of the anti-rotation block 20. The two rectangular strips are respectively located in the two sliding openings, and the surfaces are in sliding contact with the sliding opening wall. A thread is provided on part of the surface of the pressure rod 19.

[0028] The upper surface of the upper truncated plate 18 is provided with a rotating groove connected to the through-hole, and a rotating shaft 21 is rotatably installed in the rotating groove. Two annular grooves are provided on the surface of the rotating shaft 21, and multiple balls are provided in the circumferential shape in both annular grooves. The upper surface of the rotating shaft 21 is fixedly connected to the handwheel 22, and the inner wall of the rotating shaft 21 is threadedly sleeved on the pressure rod 19.

[0029] When the valve needs to be closed, only the handwheel 22 needs to be turned clockwise. The handwheel 22 will drive the rotating shaft 21 located in the upper circular platform 18 to start rotating, and the pressure rod 19 will start to move downward under the restriction of the anti-rotation block 20, thereby driving the bellows 13 to move downward through the upper valve stem 15. When the valve needs to be opened, only the handwheel 22 needs to be turned counterclockwise. The handwheel 22 will drive the rotating shaft 21 located in the upper circular platform 18 to start rotating, and the pressure rod 19 will start to move upward under the restriction of the anti-rotation block 20, thereby driving the bellows 13 to move upward through the upper valve stem 15.

[0030] The mounting component includes two flanges 23 of different sizes. The flange 23 close to the valve body 1 is used to connect the valve body 1 and the valve pipe 14, and the other flange 23 is used to connect the valve pipe 14 and the indicating component.

[0031] A compressible filler 24 is provided inside the valve tube 14. The filler 24 is made of graphene and is filled in the gap between the surface of the upper valve stem 15 and the inner wall of the valve tube 14 to prevent leakage of the medium.

[0032] When the sealing performance of the bellows 13 is damaged and the medium leaks to the upper valve stem 15, the packing 24 will act as a second line of defense to prevent the medium from continuing to leak.

[0033] The top of the isolation sleeve 12 and the bottom of the upper valve stem 15 are both designed with inverted seals to enhance the overall sealing performance.

[0034] When the valve of the present invention is closed, the bellows 13 moves downward, driving the lower valve stem 6 to move downward. The lower valve stem 6 will press the telescopic spring 9 through the pressure ring 8 to drive the valve disc 4 to move downward until the valve disc 4 blocks the input chamber 2. The lower valve stem 6 continues to move downward. At this time, the telescopic spring 9 begins to be compressed under the pressure of the pressure ring 8, and the gas in the piston sleeve 5 is gradually discharged into the annular airbag 11 by the lower valve stem 6 through the circular groove and the connecting hole 10. At this time, the annular airbag 11 begins to expand and fills the gap between the valve disc 4 and the inner wall of the input chamber 2, further sealing the valve, improving the sealing performance of the valve, and effectively preventing medium leakage.

Claims

1. A rotary valve stem bellows sealing device comprising a valve body (1), characterized in that: The valve body (1) is provided with an input chamber (2) and an output chamber (3) communicating with the outside world. The output chamber (3) is provided with a valve disc (4) and a lower valve stem (6). The surface of the lower valve stem (6) is vertically slidably sleeved with a piston sleeve (5) fixedly connected to the valve disc (4). The inner wall of the piston sleeve (5) is provided with an annular limiting groove (7). A telescopic spring (9) is fixedly installed on the inner bottom wall of the annular limiting groove (7). A pressure ring (8) fixedly connected to the surface of the lower valve stem (6) is vertically slidably installed in the telescopic spring (9). The outer ring wall of the pressure ring (8) is in sliding sealing contact with the groove wall of the annular limiting groove (7). The surface of the valve disc (4) is fixedly provided with a ring shaped airbag (11), the valve disc (4) is provided with a circular groove connected to the piston sleeve (5), the circular groove wall is provided with a plurality of connecting holes (10) all connected to the annular airbag (11) in a circumferential shape, the lower valve stem (6) is fixedly sleeved with an isolation sleeve (12), the valve body (1) is fixedly connected to a valve pipe (14) connected to the output chamber (3) through a mounting component, a bellows (13) is vertically slidably provided in the valve pipe (14), one end of the bellows (13) is fixedly connected to the lower valve stem (6), and the other end is fixedly connected to the upper valve stem (15), and the upper valve stem (15) is fixedly connected to a hand wheel (22) through an indicating component.

2. The rotary valve stem bellows sealing device according to claim 1, characterized in that: The indicating component includes a lower circular table (16), the lower circular table (16) is fixedly connected to the valve tube (14) through a mounting component, the lower circular table (16) is fixedly connected to the upper circular table (18) through two connecting columns (17), and the two connecting columns (17) are provided with rectangular strips on the sides close to each other. The surfaces of the lower circular table (16) and the upper circular table (18) are both provided with through-holes, and a pressure rod (19) whose bottom end is fixedly connected to the top of the upper valve stem (15) is vertically slidably installed in the two through-holes. An anti-rotation block (20) with a T-shaped longitudinal section is fixedly sleeved on the pressure rod (19), and the anti-rotation block (20) is provided with sliding openings at both ends. The two rectangular strips are respectively located in the two sliding openings, and their surfaces are in sliding contact with the sliding opening wall. A thread is provided on part of the surface of the pressure rod (19).

3. The rotary valve stem bellows sealing device according to claim 2, characterized in that: The upper surface of the upper truncated table (18) is provided with a rotation groove connected to the through opening, and a rotating shaft (21) is rotatably installed in the rotation groove. The surface of the rotating shaft (21) is provided with two annular grooves, and a plurality of balls are provided in the two annular grooves in a circumferential shape. The upper surface of the rotating shaft (21) is fixedly connected to the hand wheel (22), and the inner wall of the rotating shaft (21) is threadedly sleeved on the pressure rod (19).

4. The rotary valve stem bellows sealing device according to claim 2, characterized in that: The mounting component comprises two flanges (23) of different sizes, the flange (23) close to the valve body (1) is used to connect the valve body (1) and the valve pipe (14), and the other flange (23) is used to connect the valve pipe (14) and the indicating component.

5. The rotary valve stem bellows sealing device according to claim 4, characterized in that: A compressible filler (24) is provided inside the valve tube (14). The filler (24) is made of graphene. The filler (24) is filled in the gap between the surface of the upper valve stem (15) and the inner wall of the valve tube (14) to prevent leakage of the medium.

6. The rotary valve stem bellows sealing device according to claim 1, characterized in that: The top of the isolation sleeve (12) and the bottom of the upper valve stem (15) are both designed with inverted seals to enhance the overall sealing performance.

Images