Adjustable circular residual pressure valve

Abstract

The utility model belongs to the technical field of valves, and particularly relates to an adjustable circular residual pressure valve which comprises a valve body provided with a support, a cantilever installed on the valve body through the support, a valve plate and a heavy punch which are connected with the two ends of the cantilever respectively, and an angle adjusting mechanism. The angle adjusting mechanism comprises a long arc hole formed in the support, a first adjusting bolt fixedly connected with the support through the long arc hole and a limiting block installed on the first adjusting bolt and used for opening and limiting the cantilever, and the limiting block has the freedom degree with the position adjustable through cooperation of the first adjusting bolt and the long arc hole. According to the residual pressure valve, the maximum opening angle of the valve plate can be adjusted according to the field air volume, and the use requirements of different air volumes are met.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to an adjustable circular residual pressure valve. Background Art

[0002] The residual pressure valve is a one-way opening air volume regulating device and an important component of the ventilation system of a nuclear power plant. It is mainly used in situations where there are special positive pressure (negative pressure) requirements in the system. It is generally installed on the partition wall of two spaces where position pressure difference is required. The wind pressure is balanced by adjusting the weight on the cantilever. It opens when the set pressure difference is reached, reaches balance after a certain amount of air is discharged, and closes when the pressure difference drops to the minimum pressure difference.

[0003] According to the usage and feedback of nuclear power sites, the opening angle of the existing circular residual pressure valve is not enough to meet the needs of different air volumes, especially the exhaust system with large air volumes under special circumstances. Utility Model Content

[0004] In order to solve the problems existing in the above-mentioned prior art, the utility model provides an adjustable circular residual pressure valve, which can adjust the maximum opening angle of the valve plate according to the on-site air volume to meet the use requirements of different air volumes.

[0005] The specific technical solution adopted by the utility model is:

[0006] An adjustable circular residual pressure valve comprises a valve body with a bracket thereon, a cantilever mounted on the valve body by means of the bracket, and a valve plate and a weight respectively connected to the two ends of the cantilever. The key point is that it also comprises an angle adjustment mechanism, the angle adjustment mechanism comprises an elongated arc hole arranged on the bracket, a first adjusting bolt fixedly connected to the bracket by means of the elongated arc hole, and a limit block mounted on the first adjusting bolt for limiting the opening of the cantilever, the limit block has the freedom of adjustable position by means of the cooperation between the first adjusting bolt and the elongated arc hole.

[0007] The lower end of the cantilever is provided with an oblong hole, and the weight is connected to the cantilever by means of a second adjusting bolt passing through the oblong hole, and has the freedom of position adjustment by means of the cooperation between the second adjusting bolt and the oblong hole.

[0008] The cantilever is provided with a group of rectangular holes located above the oblong hole, a U-shaped gasket is provided between the weight and the cantilever, and slots are respectively opened on the upper ends of the gaskets. The side walls of the slots are connected with V-shaped springs matched with the rectangular holes.

[0009] It also includes a locking mechanism matched with the cantilever, the locking mechanism includes a pin shaft arranged on the bracket, an operating handle connected to one end of the pin shaft and a cam arranged on the bracket by means of the pin shaft, and the cam contacts the side surface of the cantilever.

[0010] A sealing ring matching the valve plate is arranged on the side wall of the valve body.

[0011] The beneficial effects of the utility model are:

[0012] The utility model adopts a limit block for the cantilever opening angle added to the bracket, a long arc hole is arranged on the bracket, and the position of the limit block is adjusted at different positions of the long arc hole by means of a first adjusting bolt, thereby changing the opening angle of the cantilever, thereby realizing the adjustment of the opening angle of the valve plate. The structure is simple and reliable, and meets the use requirements of different flow rates in the exhaust system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 yes Figure 1 Left view of

[0015] Figure 3 yes Figure 1 The AA section view after the heavy hammer is omitted;

[0016] Figure 4 1. It is a schematic diagram of the assembly of the angle adjustment mechanism and the bracket;

[0017] Figure 5 is a schematic diagram of the assembly of the locking mechanism and the bracket;

[0018] Figure 6 It is a schematic diagram of the structure of the gasket;

[0019] In the accompanying drawings, 1. valve body, 2. valve plate, 3. sealing ring, 4. cantilever, 5. locking mechanism, 52. pin shaft, 53. cam, 54. operating handle, 6. bracket, 7. angle adjustment mechanism, 71. long arc hole, 72. limit block, 73. first adjusting bolt, 8. heavy hammer, 9. long round hole, 10. second adjusting bolt, 11. rectangular hole, 12. gasket, 121. slotted hole, 122. V-shaped spring clip. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments:

[0021] Specific implementation examples Figure 1-6As shown, an adjustable circular residual pressure valve comprises a valve body 1 with a bracket 6 thereon, a cantilever 4 mounted on the valve body 1 by means of the bracket 6, and a valve plate 2 and a weight 8 respectively connected to the two ends of the cantilever 4; the valve body 1 is welded by a valve seat and a flange, and the flange hole on the flange is fixed to the wall by bolts, and the installation method is quick and convenient; the valve plate 2 is opened or closed under the system pressure; a sealing ring 3 matching the valve plate 2 is arranged on the side wall of the valve body 1 to improve the sealing performance of the closure of the valve plate 2 and the valve body 1 and prevent air from flowing back. The residual pressure valve also includes an angle adjustment mechanism 7, which includes a long arc hole 71 arranged on the bracket 6, a first adjustment bolt 73 fixedly connected to the bracket 6 by means of the long arc hole 71, and a limit block 72 installed on the first adjustment bolt 73 to limit the opening of the cantilever 4, and the limit block 72 has the freedom of position adjustment by means of the cooperation between the first adjustment bolt 73 and the long arc hole 71. When in use, loosen the first adjusting bolt 73, adjust the position of the limit block 72 on the long arc hole 71 according to the size of the on-site wind volume, adjust the opening angle of the cantilever 4, and thus adjust the maximum opening angle of the valve plate 2 to avoid the valve plate 2 opening angle being too small and the pressure failing to reach balance for a long time. The angle adjustment mechanism 7 has a simple and reliable structure and is easy to operate, especially for on-site adjustment.

[0022] Furthermore, an oblong hole 9 is provided at the lower end of the cantilever 4, and the weight 8 is connected to the cantilever 4 by means of a second adjusting bolt 10 passing through the oblong hole 9, and has the freedom of adjustable position by means of the cooperation between the second adjusting bolt 10 and the oblong hole 9. According to the size of the air volume, the minimum opening pressure difference can be adjusted by changing the position of the weight 8 on the oblong hole 9.

[0023] Furthermore, a group of rectangular holes 11 located above the oblong hole 9 are provided on the cantilever 4, and a U-shaped gasket 12 is provided between the weight 8 and the cantilever 4. The U-shaped gasket 12 is clamped on the cantilever 4 from bottom to top, and the two sides of the gasket 12 are respectively located on the two sides of the cantilever 4 for easy installation, and a slot 121 is provided on the upper end of the gasket 12, and the side wall of the slot 121 is connected with a V-shaped spring piece 122 matched with the rectangular hole 11, and the bottom of the gasket 12 contacts the bottom of the cantilever 4. The gasket 12 is not easy to rotate due to the obstruction of the bottom of the cantilever 4, and the gasket 12 is moved along the oblong hole 9 to realize the simultaneous movement of the V-shaped spring pieces 122 on both sides of the cantilever 4, which is quick and convenient; the rectangular hole 11 is used as the preset position of the gasket 12, and can be flexibly adjusted according to the preset position to select Select the position of the gasket 12 and the weight 8 that are suitable for the on-site air volume, and then tighten the second adjusting bolt 10 to fix it. The gasket 12 is clamped by the weight 8 and the cantilever 4. The V-shaped spring piece 122 on the gasket 12 is inserted into and fixed in the slot 121. The width of the slot 121 is the same as the thickness of the V-shaped spring piece 122 after closing, and the depth of the slot 121 is equal to or greater than 2 times the length of the V-shaped spring piece 122 after closing, so as to prevent the V-shaped spring pieces 122 on the gasket 12 on both sides of the cantilever 4 from interfering with each other; when the valve plate 2 of the residual pressure valve is repeatedly opened and closed during operation, the weight 8 is vibrated, and the two sides of the V-shaped spring piece 122 are respectively limited by the slot 121, which can effectively prevent the weight 8 from displacement, thereby ensuring that the minimum opening pressure difference remains unchanged and reducing the maintenance frequency.

[0024] The residual pressure valve also includes a locking mechanism 5 matched with the cantilever 4, which includes a pin 52 arranged on the bracket 6, an operating handle 54 connected to one end of the pin 52, and a cam 53 arranged on the bracket 6 by means of the pin 52, and the cam 53 and the valve plate 2 are located on the same side of the swing arm 4. The cam 53 contacts the side of the cantilever 4. When the residual pressure valve is transported or in other situations where locking is required, the convex surface of the cam 53 clamps the cantilever 4 and the valve body 1 by rotating the handle 4, and a large damping is generated between the surface of the pin 52 and the bracket 6. The cam 53 plays a locking role on the cantilever 4 to prevent the valve plate 2 from moving. The locking mechanism 5 has a simple structure, is easy to manufacture, and is convenient to operate. It not only meets the locking function required by the residual pressure valve, but also reduces the manufacturing cost and the manufacturing cycle.

Claims

1. An adjustable circular residual pressure valve, comprising a valve body (1) with a bracket (6) thereon, a cantilever (4) mounted on the valve body (1) by means of the bracket (6), and a valve plate (2) and a weight (8) respectively connected to both ends of the cantilever (4), characterized in that: The invention also comprises an angle adjustment mechanism (7), wherein the angle adjustment mechanism (7) comprises an elongated circular arc hole (71) provided on the bracket (6), a first adjustment bolt (73) fixedly connected to the bracket (6) by means of the elongated circular arc hole (71), and a limit block (72) mounted on the first adjustment bolt (73) for limiting the opening of the cantilever (4), wherein the limit block (72) has a position-adjustable freedom by means of the cooperation between the first adjustment bolt (73) and the elongated circular arc hole (71).

2. The adjustable circular residual pressure valve according to claim 1, characterized in that: The lower end of the cantilever (4) is provided with an oblong hole (9), and the weight (8) is connected to the cantilever (4) by means of a second adjusting bolt (10) passing through the oblong hole (9), and has the freedom of position adjustment by means of the cooperation between the second adjusting bolt (10) and the oblong hole (9).

3. The adjustable circular residual pressure valve according to claim 2, characterized in that: The cantilever (4) is provided with a group of rectangular holes (11) located above the oblong hole (9); a U-shaped gasket (12) is provided between the weight (8) and the cantilever (4); slots (121) are respectively provided at the upper ends of the gaskets (12); and the side walls of the slots (121) are connected with V-shaped spring pieces (122) matched with the rectangular holes (11).

4. The adjustable circular residual pressure valve according to claim 1, characterized in that: The invention also comprises a locking mechanism (5) matched with the cantilever (4), wherein the locking mechanism (5) comprises a pin shaft (52) arranged on the bracket (6), an operating handle (54) connected to one end of the pin shaft (52), and a cam (53) arranged on the bracket (6) by means of the pin shaft (52), wherein the cam (53) contacts the side surface of the cantilever (4).

5. The adjustable circular residual pressure valve according to claim 1, characterized in that: A sealing ring (3) matching the valve plate (2) is arranged on the side wall of the valve body (1).

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