Quick cut-off valve

Abstract

The utility model relates to the technical field of cut-off valves, in particular to a quick cut-off valve which comprises a valve body. The top end of the valve body communicates with a high table, an air cylinder is arranged at the upper end of the high table, a pneumatic mechanism is arranged in the air cylinder, and a lifting mechanism is arranged in the high table. The first spring, the sealing plate and the elastic membrane are used in cooperation, the piston is installed at the upper end of the interior of the inflator through the second spring, compressed air enters from the air inlet and then presses the piston downwards, then the piston presses the inflator downwards, the inflator controls the valve rod to drive the valve plate to descend, and the penetrating groove in the middle of the partition plate is blocked; when the stop valve is used, fluid flowing in the valve body is cut off, if a sealing ring on the outer wall of the piston is abraded, the air tightness can be guaranteed through the elastic membrane on the outer side of the sealing plate, and therefore the sealing performance of the stop valve is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cut-off valves, in particular to a quick cut-off valve. Background Technique

[0002] The pneumatic cut-off valve is used to cut off the medium pressure on various medium pipelines and consists of a pneumatic device and a valve. The valve structure generally adopts a globe valve. The piston rod of the pneumatic device is connected to the valve rod of the globe valve. When the piston rod moves, it drives the valve flap to open or close.

[0003] As disclosed in a pneumatic cut-off valve with the authorization publication number CN206738665U, it has a valve body. The valve body includes an upper valve body and a lower valve body. A valve cavity extending in the up and down direction is provided in the valve body. The characteristics are as follows: A valve rod is movably assembled up and down in the valve cavity. One end of the valve rod is provided with a valve core and the other end is provided with a piston device. First openings and second openings are respectively provided on both sides of the valve cavity close to one end of the valve core. After adopting the above technical solution, the beneficial effects of the utility model are as follows: The pneumatic cut-off valve is not only compact in structure but also good in airtightness. The provided sealing ring and piston sealing ring greatly improve the firmness between the piston, the connecting device and the valve rod.

[0004] Although the above patent improves the firmness between the piston, the connecting device and the valve rod, the piston sealing ring provided on the outside of the piston rubs against the inner wall of the upper valve body during the up and down movement, which will cause wear. The wear of the piston sealing ring will affect the airtightness, thereby affecting the sealing performance at the valve flap. Content of the Utility Model

[0005] The purpose of the utility model is to provide a quick cut-off valve to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] The quick cut-off valve includes

[0008] a valve body;

[0009] A high platform is communicated with the top end of the valve body. An air cylinder is arranged at the upper end of the high platform. A pneumatic mechanism is arranged inside the air cylinder. A lifting mechanism is arranged inside the high platform;

[0010] A partition is arranged inside the valve body. A through groove is opened in the middle of the partition.

[0011] Preferably, a flange is further arranged at the top end of the air cylinder. An air inlet is arranged in the middle of the top end of the flange;

[0012] Preferably, the pneumatic mechanism includes a second spring, the second spring is arranged on the lower end surface of the flange, a piston is fixedly installed at the bottom end of the second spring, and a sealing ring is arranged outside the piston;

[0013] Preferably, the lifting mechanism includes a first spring, the first spring is arranged inside the lower part of the high platform, a sealing plate is fixedly installed at the top end of the first spring, a valve rod is arranged below the middle part of the sealing plate, and a valve plate is arranged at the bottom end of the valve rod through the high platform and the valve body;

[0014] Preferably, the lifting mechanism further includes an elastic diaphragm, the elastic diaphragm is annularly arranged at the lower inner wall of the air cylinder, and the inner ring of the elastic diaphragm is fixedly connected with the outer ring of the sealing plate;

[0015] Preferably, an annular groove is annularly arranged at the inner wall of the top end of the air cylinder, a bottom ring is arranged at the inner side of the bottom end of the flange, and a plurality of bolts are equiangularly arranged among the bottom ring, the annular groove and the air cylinder.

[0016] Compared with the prior art, the beneficial effects of the present utility model are:

[0017] For this quick cut-off valve, through the cooperation of the first spring, the sealing plate and the elastic diaphragm, a piston is installed inside the upper end of the air cylinder of the device through the second spring. After the compressed gas enters from the air inlet, it presses down the piston, and the piston then presses down the air cylinder. The air cylinder controls the valve rod to drive the valve plate to descend, and blocks the through groove in the middle of the partition plate, so that the fluid flowing inside the valve body is cut off. If the sealing ring on the outer wall of the piston is worn, the airtightness can also be ensured by the elastic diaphragm outside the sealing plate, thereby improving the sealing performance of the cut-off valve.

[0018] For this quick cut-off valve, through the cooperation of the air cylinder, the flange, the bottom ring and the bolts, the flange is installed at the top end of the air cylinder, the bottom ring is arranged at the inner side of the bottom end of the flange, the annular groove is arranged at the inner side of the top end of the air cylinder, and the bottom ring and the air cylinder are fixed by a plurality of bolts. When it is necessary to replace the sealing ring on the outer wall of the piston, the bolts can be removed and then the flange can be disassembled, so as to achieve the purpose of convenient maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall front view structural schematic diagram of the present utility model;

[0020] Figure 2 is the overall sectional view structural schematic diagram of the present utility model;

[0021] Figure 3 is the Figure 2 magnified schematic diagram at A in the present utility model;

[0022] Figure 4 is the Figure 2Enlarged schematic diagram at position B in the [device].

[0023] In the figure: 1, valve body; 2, high platform; 3, air cylinder; 4, partition plate; 5, through groove; 6, flange; 7, air inlet; 8, second spring; 9, piston; 10, sealing ring; 11, first spring; 12, sealing plate; 13, valve stem; 14, valve plate; 15, elastic diaphragm; 16, annular groove; 17, bottom ring; 18, bolt. Specific implementation mode

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] As Figures 1-4 shown, a technical solution provided by the present invention:

[0026] A quick cut-off valve, comprising a valve body 1; a high platform 2 is connected to the top end of the valve body 1, an air cylinder 3 is arranged at the upper end of the high platform 2, a pneumatic mechanism is arranged inside the air cylinder 3, a flange 6 is further arranged at the top end of the air cylinder 3, an air inlet 7 is arranged in the middle of the top end of the flange 6, the pneumatic mechanism includes a second spring 8, the second spring 8 is arranged on the lower end face of the flange 6, a piston 9 is fixedly installed at the bottom end of the second spring 8, a sealing ring 10 is arranged outside the piston 9, a lifting mechanism is arranged inside the high platform 2, the lifting mechanism includes a first spring 11, the first spring 11 is arranged below the inside of the high platform 2, a sealing plate 12 is fixedly installed at the top end of the first spring 11, a valve stem 13 is arranged below the middle of the sealing plate 12, the bottom end of the valve stem 13 passes through the high platform 2 and a valve plate 14 is arranged on the valve body 1, a partition plate 4 is arranged inside the valve body 1, a through groove 5 is opened in the middle of the partition plate 4, the lifting mechanism further includes an elastic diaphragm 15, the elastic diaphragm 15 is annularly arranged at the lower inner wall of the air cylinder 3, and the inner circle of the elastic diaphragm 15 is fixedly connected to the outer circle of the sealing plate 12;

[0027] In this embodiment, a piston 9 is installed inside the air cylinder 3 of the present device through a second spring 8. After the compressed gas enters from the air inlet 7, it presses down the piston 9, and the piston 9 then presses down the air cylinder 3. The air cylinder 3 controls the valve stem 13 to drive the valve plate 14 to descend, and blocks the through groove 5 in the middle of the partition plate 4, so that the fluid flowing inside the valve body 1 is cut off. If the sealing ring 10 at the outer wall of the piston 9 is worn, the airtightness can also be ensured through the elastic diaphragm 15 outside the sealing plate 12, thereby improving the sealing performance of the cut-off valve.

[0028] As Figure 4As shown in the figure, an annular groove 16 is annularly arranged at the inner wall of the top end of the air cylinder 3, a bottom ring 17 is arranged at the inner side of the bottom end of the flange 6, and a plurality of bolts 18 are equiangularly arranged among the bottom ring 17, the annular groove 16 and the air cylinder 3;

[0029] In this embodiment, the flange 6 is installed at the top end of the air cylinder 3, the bottom ring 17 is arranged at the inner side of the bottom end of the flange 6, the annular groove 16 is arranged at the inner side of the top end of the air cylinder 3, and the bottom ring 17 and the air cylinder 3 are fixed by a plurality of bolts 18. When the sealing ring 10 on the outer wall of the piston 9 needs to be replaced, the bolts 18 can be removed and then the flange 6 can be disassembled, so as to achieve the purpose of convenient maintenance.

[0030] Working principle: A piston 9 is installed at the upper end inside the air cylinder 3 of the device through a second spring 8. After the compressed gas enters from the air inlet 7, it presses down the piston 9, and the piston 9 then presses down the air cylinder 3. The control valve rod 13 of the air cylinder 3 drives the valve plate 14 to descend and blocks the through groove 5 in the middle of the partition plate 4, so that the fluid flowing in the valve body 1 is cut off. If the sealing ring 10 on the outer wall of the piston 9 is worn, the airtightness can also be ensured by the elastic diaphragm 15 outside the sealing plate 12; the flange 6 is installed at the top end of the air cylinder 3, the bottom ring 17 is arranged at the inner side of the bottom end of the flange 6, the annular groove 16 is arranged at the inner side of the top end of the air cylinder 3, and the bottom ring 17 and the air cylinder 3 are fixed by a plurality of bolts 18. When the sealing ring 10 on the outer wall of the piston 9 needs to be replaced, the bolts 18 can be removed and then the flange 6 can be disassembled.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only the preferred examples of the present invention and do not limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. Quick cut-off valve, characterized by: The valve body (1) comprises a valve body (1); the top end of the valve body (1) is connected to a platform (2); the upper end of the platform (2) is provided with a gas cylinder (3); the inside of the gas cylinder (3) is provided with a pneumatic mechanism; the inside of the platform (2) is provided with a lifting mechanism; the inside of the valve body (1) is provided with a partition (4); the middle part of the partition (4) is provided with a through groove (5); the pneumatic mechanism comprises a second spring (8); the second spring (8) is provided on the lower end surface of the flange (6); the bottom end of the second spring (8) is fixedly mounted with a piston (9); the outside of the piston (9) is provided with a sealing ring (10) The lifting mechanism comprises a spring (11), wherein the spring (11) is arranged at the lower part of the platform (2), a sealing plate (12) is fixedly mounted on the top of the spring (11), a valve stem (13) is arranged at the lower part of the middle of the sealing plate (12), and the bottom end of the valve stem (13) passes through the platform (2) and is provided with a valve plate (14) on the valve body (1); the lifting mechanism also comprises an elastic diaphragm (15), wherein the elastic diaphragm (15) is arranged in an annular manner at the lower inner wall of the air cylinder (3), and the inner ring of the elastic diaphragm (15) is fixedly connected to the outer ring of the sealing plate (12).

2. The quick shut-off valve according to claim 1, characterized in that: The top end of the air cylinder (3) is further provided with a flange (6), and the middle portion of the top end of the flange (6) is provided with an air inlet (7).

3. The quick shut-off valve according to claim 2, characterized in that: An annular groove (16) is provided in an annular shape at the inner wall of the top end of the gas cylinder (3), a bottom ring (17) is provided on the inner side of the bottom end of the flange (6), and a plurality of bolts (18) are provided with equal arcs between the bottom ring (17), the annular groove (16) and the gas cylinder (3).

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