Fully-sealed low-pressure diaphragm type back pressure valve

Abstract

The utility model discloses a fully-sealed low-pressure diaphragm type back pressure valve, relates to the technical field of back pressure valves, and aims at solving the problems that the sealing performance of a pressure adjusting structure of an existing back pressure valve needs to be improved, and leakage is prone to occurring in the long-term using process. The upper end of the valve body is integrally connected with a mounting seat, an inner partition plate is fixedly connected to the inner wall of the mounting seat, a fluid through hole is formed in the outer surface of the inner partition plate, the inner wall of the mounting seat is in threaded connection with an adjusting seat, one end of the adjusting seat is slidably connected with a blocking block, and the blocking block corresponds to the fluid through hole in position. The outer portion of the blocking block is sleeved with a spring, the two ends of the spring abut against the outer surface of the blocking block and the outer surface of the adjusting base respectively, and the outer portion of the mounting base is sleeved with an end cover in a threaded mode. And the effects that the pressure can be flexibly adjusted, meanwhile, high-sealing treatment can be conducted, and practicability is high are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of back pressure valves, in particular to a low-pressure diaphragm type back pressure valve with sufficient sealing. Background Art

[0002] Under the condition of unstable pressure in pipelines or equipment containers, the back pressure valve can maintain the required pressure in the pipeline, enabling the pump to output normal flow. Additionally, due to gravity or other effects at the outlet end of the pump, siphon phenomenon often occurs. At this time, the back pressure valve can reduce the fluctuations in flow and pressure caused by siphon.

[0003] The sealing performance of the pressure adjustment structure of the existing back pressure valve needs to be improved, and leakage is likely to occur during long-term use. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a low-pressure diaphragm type back pressure valve with sufficient sealing, which can not only flexibly adjust the pressure but also perform high-sealing treatment, with strong practicability.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A low-pressure diaphragm type back pressure valve with sufficient sealing includes a valve body. An installation seat is integrally connected to the upper end of the valve body. An inner partition is fixedly connected to the inner wall of the installation seat. A fluid through-hole is arranged on the outer surface of the inner partition. An adjustment seat is threadedly connected to the inner wall of the installation seat. One end of the adjustment seat is slidably connected with a plug block, which corresponds to the position of the fluid through-hole. A spring is sleeved outside the plug block, and both ends of the spring respectively abut against the outer surfaces of the plug block and the adjustment seat.

[0007] By adopting the above technical solution, the installation seat can be subjected to the first-stage sealing operation by using the adjustment seat, and the cooperation between the spring and the plug block is used to ensure that the fluid inside the pipeline has a certain pressure.

[0008] Further, an end cover is threadedly sleeved outside the installation seat, and an adjustment end is rotatably connected to the middle position of the end face of the end cover.

[0009] By adopting the above technical solution, the installation seat can be subjected to the double-sealing operation by using the end cover.

[0010] Further, a nut structure is arranged at the middle position of the end face of the adjustment seat, and an inner hexagonal hole is arranged at one end of the adjustment end. One end of the adjustment end is sleeved outside the nut structure on the adjustment seat.

[0011] By adopting the above technical solution, the adjustment seat can be driven to rotate by screwing the adjustment end, thereby finely adjusting the pressure inside the back pressure valve.

[0012] Furthermore, a drain pipe and a water inlet pipe are respectively and fixedly connected to symmetric positions on the side surface of the valve body.

[0013] By adopting the above technical solution, it is ensured that the fluid can stably pass through the inside of the back pressure valve.

[0014] Furthermore, installation grooves are respectively arranged at the ports of the drain pipe and the water inlet pipe, and sealing air bags are adhered to the inside of the installation grooves.

[0015] By adopting the above technical solution, the sealing air bags can be used to improve the sealing performance of the connection between the back pressure valve and the external pipeline.

[0016] Furthermore, a cylinder is fixedly connected to the lower end of the valve body. A threaded hole is arranged on the end surface of the cylinder, and a screw rod is threadedly connected to the inside of the threaded hole. One end of the screw rod is rotatably installed with a piston block, and the piston block is located inside the cylinder. One air guide pipe is respectively and fixedly connected to the symmetric side surfaces of the cylinder. The two air guide pipes are respectively communicated with the sealing air bags, and the two air guide pipes respectively penetrate through the installation holes on the side surfaces of the drain pipe and the water inlet pipe, and the air guide pipes are respectively welded and fixed to the drain pipe and the water inlet pipe.

[0017] By adopting the above technical solution, air can be stably introduced into the inside of the sealing air bag.

[0018] To sum up, the beneficial technical effects of the present utility model are as follows:

[0019] 1. The present utility model can use the adjusting seat to perform the first-stage sealing treatment on the mounting seat, and use the end cover to perform the second-stage sealing treatment on the mounting seat, which can effectively improve the overall sealing performance. At the same time, the spring can be used to improve the stability of the blocking block for blocking the fluid through hole, and at the same time ensure that there is a certain pressure inside the valve body. During use, since the adjusting end is rotatably connected to the middle position of the end cover, and one end of the adjusting end is limited and sleeved outside the nut structure of the adjusting seat, rotating the adjusting end can effectively drive the adjusting seat to rotate, thereby compressing the spring, which can effectively increase the acting force for pushing the blocking block, and then increase the pressure inside the valve body. The overall adjustment flexibility is high and the practicability is high;

[0020] 2. After installation, the present utility model can screw the screw rod, so that the screw rod moves axially, and then the piston block moves inside the cylinder, and the air inside the cylinder is pressed into the inside of the sealing air bag along the air guide pipe, so that the volume of the sealing air bag expands. The expanded sealing air bag can effectively block the gap at the connection between the back pressure valve and the external pipeline, and can further improve the sealing performance of the back pressure valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0022] Figure 2 is a schematic diagram of the internal structure of the present utility model;

[0023] Figure 3 For the present utility model Figure 2 is an enlarged view of part A.

[0024] In the figure: 1, valve body; 2, drain pipe; 3, water inlet pipe; 4, sealing airbag; 5, air guide pipe; 6, air cylinder; 7, screw; 8, end cover; 9, adjusting end; 10, inner partition; 11, adjusting seat; 12, plug; 13, spring; 14, piston block; 15, fluid through hole; 16, mounting seat.

[0025] Specific real-time manner

[0026] The method of the present utility model will be further described in detail below with reference to the accompanying drawings.

[0027] Referring to Figure 1 , Figure 2 , Figure 3 , a fully sealed low-pressure diaphragm back pressure valve includes a valve body 1. An upper end of the valve body 1 is integrally connected with a mounting seat 16. An inner partition 10 is fixedly connected to an inner wall of the mounting seat 16. A fluid through hole 15 is provided on an outer surface of the inner partition 10. An adjusting seat 11 is threadedly connected to the inner wall of the mounting seat 16. A plug 12 is slidably connected to one end of the adjusting seat 11. The plug 12 corresponds to the position of the fluid through hole 15. A spring 13 is sleeved outside the plug 12. Two ends of the spring 13 respectively abut against outer surfaces of the plug 12 and the adjusting seat 11. An end cover 8 is threadedly sleeved outside the mounting seat 16. An adjusting end 9 is rotatably connected to a middle position of an end face of the end cover 8. A nut structure is provided at a middle position of an end face of the adjusting seat 11. An inner hexagonal hole is provided at one end of the adjusting end 9. One end of the adjusting end 9 is sleeved outside the nut structure on the adjusting seat 11. Among them, the adjusting seat 11 can be used to perform a first-stage sealing treatment on the mounting seat 16, and the end cover 8 can be used to perform a second-stage sealing treatment on the mounting seat 16, which can effectively improve the overall sealing performance. At the same time, the spring 13 can be used to improve the stability of the plug 12 blocking the fluid through hole 15, and at the same time ensure that there is a certain pressure inside the valve body 1. During use, since the adjusting end 9 is rotatably connected to the middle position of the end cover 8, and one end of the adjusting end 9 is limited and sleeved outside the nut structure of the adjusting seat 11, rotating the adjusting end 9 can effectively drive the adjusting seat 11 to rotate, thereby compressing the spring 13, which can effectively increase the acting force for pushing the plug 12, and thus increase the pressure inside the valve body 1. The overall adjustment flexibility is high and the practicability is high.

[0028] Referring to Figure 2, drain pipes 2 and water inlet pipes 3 are respectively fixedly connected at symmetrical positions on the side surface of the valve body 1. Installation grooves are respectively arranged at the ports of the drain pipes 2 and the water inlet pipes 3, and sealing air bags 4 are adhered inside the installation grooves. The lower end of the valve body 1 is fixedly connected with an air cylinder 6. A threaded hole is arranged on the end surface of the air cylinder 6, and a screw rod 7 is threadedly connected inside the threaded hole. One end of the screw rod 7 is rotatably installed with a piston block 14. The piston block 14 is located inside the air cylinder 6. One air guide pipe 5 is respectively fixedly connected on the symmetrical side surfaces of the air cylinder 6. The two air guide pipes 5 are respectively communicated with the sealing air bags 4. The two air guide pipes 5 respectively penetrate through the installation holes on the side surfaces of the drain pipes 2 and the water inlet pipes 3, and the air guide pipes 5 are respectively welded and fixed with the drain pipes 2 and the water inlet pipes 3. After installation, the screw rod 7 can be rotated to enable the screw rod 7 to move axially, and then the piston block 14 moves inside the air cylinder 6, and the air inside the air cylinder 6 is pressed into the sealing air bag 4 along the air guide pipe 5, so that the volume of the sealing air bag 4 expands. The expanded sealing air bag 4 can effectively block the gap at the connection between the back pressure valve and the external pipeline, and can further improve the sealing performance of the back pressure valve.

[0029] Working principle: During use, first install the back pressure valve at the designated position on the pipeline. During installation, rotate the screw rod 7 to enable the screw rod 7 to move axially, and then the piston block 14 moves inside the air cylinder 6, and the air inside the air cylinder 6 is pressed into the sealing air bag 4 along the air guide pipe 5, so that the volume of the sealing air bag 4 expands. The expanded sealing air bag 4 can effectively block the gap at the connection between the back pressure valve and the external pipeline. Then, adjust the internal pressure of the back pressure valve according to the use requirements. During adjustment, since the adjustment end 9 is rotatably connected to the middle position of the end cover 8, and one end of the adjustment end 9 is limited and sleeved outside the nut structure of the adjustment seat 11, rotating the adjustment end 9 can effectively drive the adjustment seat 11 to rotate, and then compress the spring 13, which can effectively increase the acting force for pushing the plug 12, and then increase the internal pressure of the valve body 1. After adjustment, normal use can be carried out. At this time, the fluid inside the pipeline enters the valve body 1 along the water inlet pipe 3. When the internal pressure reaches a certain value, the fluid pushes the plug 12 to move, and the plug 12 moves away from the fluid through hole 15. The fluid passes through the fluid through hole 15 and then is discharged from the drain pipe 2.

[0030] All the embodiments of this specific implementation mode are the preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A fully sealed low-pressure diaphragm backpressure valve, comprising a valve body (1), characterized in that: An upper end of the valve body (1) is integrally connected with a mounting seat (16). An inner partition (10) is fixedly connected to an inner wall of the mounting seat (16). A fluid through-hole (15) is arranged on an outer surface of the inner partition (10). An adjusting seat (11) is threadedly connected to the inner wall of the mounting seat (16). A plug block (12) is slidably connected to one end of the adjusting seat (11). The plug block (12) corresponds to the position of the fluid through-hole (15). A spring (13) is sleeved outside the plug block (12). Two ends of the spring (13) respectively abut against outer surfaces of the plug block (12) and the adjusting seat (11).

2. The fully sealed low-pressure diaphragm backpressure valve according to claim 1, wherein: An end cover (8) is threadedly sleeved outside the mounting seat (16). An adjusting end (9) is rotatably connected to a middle position of an end face of the end cover (8).

3. The fully sealed low-pressure diaphragm back-pressure valve according to claim 2, characterized in that: A nut structure is arranged at a middle position of an end face of the adjusting seat (11). An inner hexagonal hole is arranged at one end of the adjusting end (9). One end of the adjusting end (9) is sleeved outside the nut structure on the adjusting seat (11).

4. A fully sealed low-pressure diaphragm backpressure valve according to claim 1, characterized in that: A drain pipe (2) and a water inlet pipe (3) are respectively and fixedly connected to symmetric positions on a side surface of the valve body (1).

5. A fully sealed low-pressure diaphragm backpressure valve according to claim 4, characterized in that: Mounting grooves are respectively arranged at ports of the drain pipe (2) and the water inlet pipe (3), and sealing air bags (4) are adhered to interiors of the mounting grooves.

6. The fully sealed low-pressure diaphragm back-pressure valve according to claim 5, wherein: A cylinder (6) is fixedly connected to a lower end of the valve body (1). A threaded hole is arranged on an end face of the cylinder (6), and a screw rod (7) is threadedly connected to the threaded hole. A piston block (14) is rotatably installed at one end of the screw rod (7). The piston block (14) is located inside the cylinder (6). A guide air pipe (5) is respectively fixedly connected to each of symmetric side surfaces of the cylinder (6). The two guide air pipes (5) are respectively communicated with the sealing air bags (4). The two guide air pipes (5) respectively penetrate through mounting holes on side surfaces of the drain pipe (2) and the water inlet pipe (3). The guide air pipes (5) are respectively welded and fixed to the drain pipe (2) and the water inlet pipe (3).

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