Stop valve

Abstract

The stop valve comprises a valve body, a valve seat, a valve rod connected with valve clacks, a corrugated pipe and an installation groove, an annular disc is installed in the installation groove, an inner ring of the annular disc is fixedly installed at one end of the corrugated pipe, and the other end of the corrugated pipe is connected to the position, close to the valve clacks, of the valve rod. A spiral groove is formed in the position, between the corrugated pipe and the valve clack, of the peripheral wall of the valve rod, a rotating frame forming steering linkage with the spiral groove and a limiting structure limiting the rotating frame to move in the axial direction of the valve rod are arranged between the valve body and the valve rod, and a cleaning brush is arranged on the rotating frame in an extending mode along the axis of the corrugated pipe and abuts against the peripheral wall of the corrugated pipe. The multiple cleaning brushes are distributed along the periphery of the corrugated pipe in a surrounding mode, the maximum stretching stroke of the corrugated pipe is smaller than the length of the cleaning brushes, the rotating frame drives the cleaning brushes to rotate around the periphery of the corrugated pipe, the stop valve is suitable for the scene where the use frequency is high, crystals can be effectively prevented from being deposited on the corrugated pipe, and the service life of the stop valve is effectively prolonged.

Description

Technical Field

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

[0002] Valves are pipe accessories used to open and close pipelines, control flow direction, and regulate and control the conveying medium. One of the more important performance of valves is sealing. Ordinary valves will use stuffing boxes, and in occasions with strict requirements on valve stem sealing, such as high vacuum occasions and nuclear industry, bellows will be used instead of the stuffing boxes on ordinary valves or used together with the stuffing boxes as the valve stem sealing original.

[0003] During the operation of a conventional bellows stop valve, when the valve is opened, the valve stem connected to the valve disc moves axially back and forth toward the valve seat. The stop valve has a wide range of applications and can adapt to the control of different fluid media. Some fluid properties cause the fluid to trigger or promote the crystallization process to produce crystals, such as temperature, pressure, solvent type and concentration. Changes in these conditions make it easy for crystals to form. The crystals will adhere to and deposit on the bellows, causing the bellows to harden, thereby affecting the stretching of the bellows. In addition, since some crystals are corrosive, they will chemically react with the material of the bellows, which will greatly affect the service life of the bellows. Therefore, the utility model aims at the above-mentioned problems and proposes a stop valve to solve the above-mentioned problems. Utility Model Content

[0004] The purpose of the utility model is to provide a stop valve, which is suitable for scenes with high frequency of use, can effectively prevent crystals from being deposited on the bellows, and effectively prolongs the service life of the stop valve.

[0005] The above technical objectives of the utility model are achieved by the following technical solutions. A stop valve comprises a valve body, a valve seat is provided in the valve body flow channel, a valve stem which is axially reciprocating towards the valve seat and is connected to the valve disc, a bellows is sleeved on the valve stem, and an installation groove which is connected to the inner cavity of the valve body is provided at the upper end of the valve body. A ring disk is installed in the installation groove and the inner ring of the ring disk is fixedly mounted on one end of the bellows, and the other end of the bellows is connected to a position between the valve stem and the valve disc, characterized in that a spiral groove is provided on the outer peripheral wall of the valve stem at a position between the bellows and the valve disc, a rotating frame which forms a steering linkage with the spiral groove and a limiting structure which limits the axial movement of the rotating frame along the valve stem is provided between the valve body and the valve stem, a cleaning brush is extended on the rotating frame along the axis of the bellows and the cleaning brush abuts against the outer peripheral wall of the bellows, and a plurality of cleaning brushes are distributed around the outer periphery of the bellows, the maximum stroke of the bellows being stretched is less than the length of the cleaning brush and the rotating frame drives the cleaning brush to rotate around the outer periphery of the bellows.

[0006] By adopting the above technical solution, the spiral rack cooperates with the spiral groove on the valve stem to drive the rotation of the spiral rack during the movement of the valve stem to clean the bellows. No other driving source is required, which is energy-saving and environmentally friendly, has low maintenance cost, reduced cost and good reliability.

[0007] It is further configured as follows: a positioning slot with an opening for inserting a cleaning brush is provided on the rotating frame, and the positioning slot limits the movement of the cleaning brush perpendicular to the insertion direction; a fixing structure for fixing the ring disc is provided between the ring disc and the valve body, and when the ring disc is in a fixed state, the ring disc limits the cleaning brush from leaving the positioning slot.

[0008] By adopting the above technical solution, the ring disc is used to limit the cleaning brush from leaving the positioning slot.

[0009] It is further configured as follows: the limiting structure includes a limiting cavity formed between the ring disk and the valve seat and a bearing is sleeved in the limiting cavity, the rotating frame is located at the inner ring of the bearing and the inner ring of the bearing is fixedly connected to the rotating frame, and the upper end face and the lower end face of the bearing are both formed with an isolation gap.

[0010] By adopting the above technical solution and setting the bearing, the contact area between the rotating frame and the inner wall of the limiting cavity is reduced, which is more conducive to the smooth rotation of the rotating frame; the upper end surface and the lower end surface of the bearing are formed with a spacing gap to avoid interference with the rotation of the rotating frame.

[0011] It is further configured as follows: the fixed structure includes a plurality of fixed locking teeth fixedly arranged on the ring disk and distributed circumferentially, an entry section arranged on the valve body and having an inlet, and a locking section communicated with the entry section, the locking section and the entry section are perpendicular to each other and the fixed locking teeth can enter the entry section and the locking section in turn, and a positioning structure is provided between the fixed locking teeth and the locking section.

[0012] By adopting the above technical solution, the ring disc is fixed by fixing the locking teeth to enter the entry section and the locking section in sequence.

[0013] It is further configured as follows: the positioning structure includes a positioning block slidably arranged on the fixed lock tooth and moving with the fixed lock tooth, a positioning spring driving the positioning block to move, and a positioning groove formed in the locking section and for the positioning block to be embedded in. When the fixed lock tooth is located in the locking section, the positioning spring drives the positioning block to embed into the positioning groove to limit the fixed lock tooth from disengaging from the locking section.

[0014] By adopting the above technical solution, the positioning structure is set to prevent the ring disc from slipping out of the locking section. The positioning spring drives the positioning block to embed into the positioning groove to limit the fixed locking tooth from disengaging from the locking section. The positioning spring can also indirectly help reduce the matching error between the fixed locking tooth and the locking section, thereby optimizing the stability of the ring disc.

[0015] It is further configured that: a guiding protrusion and a guiding arc groove arranged in the positioning groove for adapting the guiding protrusion are formed on one end of the positioning block facing the positioning groove, and the guiding arc groove cooperates with the guiding arc groove so that the guiding protrusion rotates to achieve separation of the two.

[0016] By adopting the above technical solution, the guide protrusion cooperates with the guide groove to rotate the guide protrusion to achieve separation of the two, so that the ring disc can be disassembled and the rotating frame inside can be easily taken out, which is convenient for disassembly and installation of the ring disc and later maintenance of the rotating frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a cross-sectional view of the overall structure of this embodiment;

[0018] Figure 2 This is a partial exploded view of this embodiment;

[0019] Figure 3 This is an enlarged schematic diagram of point A in this embodiment;

[0020] In the figure: 1. valve body; 12. valve seat; 13. valve stem; 14. valve disc; 15. bellows; 16. mounting groove; 17. ring disk; 18. spiral groove; 19. rotating frame; 2. limiting structure; 3. cleaning brush; 191. positioning slot; 4. fixing structure; 21. bearing; 22. isolation gap; 23. limiting cavity; 41. fixing lock tooth; 42. entry section; 43. locking section; 5. positioning structure; 51. positioning block; 52. positioning spring; 53. positioning groove; 511. guide protrusion; 531. guide arc groove; 61. valve cover; 62. through hole; 63. sealing ring; 64. bolt; 65. flow channel; 66. sealing packing. DETAILED DESCRIPTION

[0021] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0022] refer to Figures 1 to 3A stop valve comprises a valve body 1, a valve seat 12 is arranged in a flow channel 65 of the valve body 1, a valve stem 13 axially reciprocating toward the valve seat 12 and connected with a valve disc 14, a bellows 15 sleeved on the valve stem 13, a mounting groove 16 communicating with the inner cavity of the valve body 1 is provided at the upper end of the valve body 1, a valve cover 61 is connected with a bolt 64 at the upper end of the mounting groove 16, a sealing packing 66 is fixedly installed between the valve cover 61 and the valve stem 13, a ring disk 17 is installed in the mounting groove 16, and the inner ring of the ring disk 17 is seal-welded to one end of the bellows 15, and the other end of the bellows 15 is seal-welded to a position between the valve stem 13 and the valve disc 14, and an outer peripheral wall of the valve stem 13 is located between the bellows 15 and the valve disc 14. There is a spiral groove 18, and a rotating frame 19 that forms a steering linkage with the spiral groove 18 and a limiting structure 2 that limits the axial movement of the rotating frame 19 along the valve stem 13 are arranged between the valve body 1 and the valve stem 13. A cleaning brush 3 is extended along the axis of the bellows 15 on the rotating frame 19, and the brush head of the cleaning brush 3 is in contact with the outer peripheral wall of the bellows 15. A plurality of cleaning brushes 3 are distributed around the outer periphery of the bellows 15. The maximum stretching stroke of the bellows 15 is less than the length of the cleaning brush 3, and the rotating frame 19 drives the cleaning brush 3 to rotate around the outer periphery of the bellows 15. The rotating frame 19 is provided with a plurality of through holes 62 in the circumferential direction of the rotating frame 19 that connect the flow channel 65, and a sealing ring 63 is provided between the mounting groove 16 and the ring disk 17.

[0023] The rotating frame 19 is provided with a positioning slot 191 having an opening for inserting the cleaning brush 3, and the positioning slot 191 limits the movement of the cleaning brush 3 perpendicular to the insertion direction. A fixing structure 4 for fixing the ring disc 17 is provided between the ring disc 17 and the valve body 1. When the ring disc 17 is in a fixed state, the ring disc 17 limits the cleaning brush 3 from leaving the positioning slot 191. The limiting structure 2 includes a limiting cavity 23 formed between the ring disc 17 and the valve seat 12, and a bearing 21 is set in the limiting cavity 23. The rotating frame 19 is located on the inner ring of the bearing 21, and the inner ring of the bearing 21 is welded to the rotating frame 19. The upper end surface and the lower end surface of the bearing 21 are both formed with an isolation gap 22.

[0024] The fixed structure 4 includes a plurality of fixed locking teeth 41 distributed circumferentially and fixedly arranged on the ring disk 17, an entry section 42 arranged on the valve body 1 and having an inlet, and a locking section 43 communicated with the entry section 42. The locking section 43 and the entry section 42 are perpendicular to each other and the fixed locking teeth 41 can enter the entry section 42 and the locking section 43 in sequence. A positioning structure 5 is provided between the fixed locking teeth 41 and the locking section 43.

[0025] The positioning structure 5 includes a positioning block 51 which is slidably set on the fixed lock tooth 41 and moves with the fixed lock tooth 41, a positioning spring 52 which drives the positioning block 51 to move, and a positioning groove 53 formed in the locking section 43 and for the positioning block 51 to be embedded in. When the fixed lock tooth 41 is located in the locking section 43, the positioning spring 52 drives the positioning block 51 to be embedded in the positioning groove 53 to limit the fixed lock tooth 41 from being separated from the locking section 43. A guiding protrusion 511 and a guiding arc groove 531 which is set on the positioning groove 53 and is used to adapt to the guiding protrusion 511 are formed at one end of the positioning block 51 facing the positioning groove 53. The guiding arc groove 531 cooperates with the guiding arc groove 531 to allow the guiding protrusion 511 to rotate to achieve separation of the two.

[0026] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A stop valve, comprising a valve body (1), a valve seat (12) provided in a flow passage of the valve body (1), a valve stem (13) axially reciprocating toward the valve seat (12) and connected to a valve disc (14), a bellows (15) sleeved on the valve stem (13), a mounting groove (16) communicating with an inner cavity of the valve body (1) provided at the upper end of the valve body (1), a ring disk (17) installed in the mounting groove (16) and an inner ring of the ring disk (17) fixedly mounted on one end of the bellows (15), and the other end of the bellows (15) connected to a position between the valve stem (13) and the valve disc (14), characterized in that: A spiral groove (18) is provided on the outer peripheral wall of the valve stem (13) between the bellows (15) and the valve flap (14); a rotating frame (19) which is in a steering linkage with the spiral groove (18) and a limiting structure (2) which limits the rotating frame (19) from moving axially along the valve stem (13) are provided between the valve body (1) and the valve stem (13); a cleaning brush (3) is provided on the rotating frame (19) extending along the axis of the bellows (15) and the cleaning brush (3) contacts the outer peripheral wall of the bellows (15); a plurality of cleaning brushes (3) are distributed around the outer periphery of the bellows (15); the maximum stroke of the bellows (15) being stretched is less than the length of the cleaning brush (3) and the rotating frame (19) drives the cleaning brush (3) to rotate around the outer periphery of the bellows (15).

2. The stop valve according to claim 1, characterized in that: The rotating frame (19) is provided with a positioning slot (191) having an opening and for inserting the cleaning brush (3), and the positioning slot (191) limits the movement of the cleaning brush (3) in a direction perpendicular to the insertion direction. A fixing structure (4) for fixing the ring disc (17) is provided between the ring disc (17) and the valve body (1). When the ring disc (17) is in a fixed state, the ring disc (17) limits the cleaning brush (3) from leaving the positioning slot (191).

3. The stop valve according to claim 1, characterized in that: The limiting structure (2) comprises a limiting cavity (23) formed between the ring disk (17) and the valve seat (12), and a bearing (21) is set in the limiting cavity (23); the rotating frame (19) is located on the inner ring of the bearing (21), and the inner ring of the bearing (21) is fixedly connected to the rotating frame (19); and the upper end surface and the lower end surface of the bearing (21) are both formed with an isolation gap (22).

4. The stop valve according to claim 2, characterized in that: The fixing structure (4) comprises a plurality of fixing locking teeth (41) which are fixedly arranged on the ring disk (17) and are distributed in the circumferential direction, an inlet section (42) which is arranged on the valve body (1) and has an inlet, and a locking section which is communicated with the inlet section (42). (43), the locking section (43) and the entry section (42) are perpendicular to each other and the fixed locking tooth (41) can enter the entry section (42) and the locking section (43) in sequence, and a positioning structure (5) is provided between the fixed locking tooth (41) and the locking section (43).

5. The stop valve according to claim 4, characterized in that: The positioning structure (5) comprises a positioning block (51) slidably arranged on the fixed locking tooth (41) and moving with the fixed locking tooth (41), a positioning spring (52) driving the positioning block (51) to move, and a positioning groove (53) formed in the locking section (43) and for the positioning block (51) to be embedded in. When the fixed locking tooth (41) is located in the locking section (43), the positioning spring (52) drives the positioning block (51) to be embedded in the positioning groove (53) to limit the fixed locking tooth (41) from being separated from the locking section (43).

6. The stop valve according to claim 5, characterized in that: The positioning block (51) has a guide protrusion (511) and a guide arc groove (531) disposed on the positioning groove (53) at one end thereof facing the positioning groove (53) for matching the guide protrusion (511). The guide arc groove (531) matches the guide arc groove (531) so that the guide protrusion (511) rotates to separate the two.

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