CN110848401A - A special oxygen shut-off valve for explosion-proof room - Google Patents

Abstract

A special oxygen stop valve for an explosion-proof chamber comprises a valve body, a valve clack and a valve rod, wherein the valve clack comprises a main valve clack and a pilot valve clack, a flow hole is formed in the bottom of the main valve clack, a balance hole is formed in the side wall of the main valve clack, and the outer edge of the bottom of the main valve clack is sealed with a conical surface of a medium through hole in the valve body; the pilot valve clack is arranged in the inner cavity of the main valve clack, the bottom of the pilot valve clack is sealed with the conical surface of the flow opening at the bottom of the main valve clack, and the other end of the pilot valve clack is connected with the valve rod through a T-shaped groove; the upper end of the main valve flap is in threaded connection with the valve flap cover, and the valve rod is matched and penetrates out of the valve flap cover; the main valve clack and the pilot valve clack are in clearance fit. The invention adopts a pressure balance valve clack structure, reduces the opening force of the valve and improves the safe use factor of the oxygen pipeline valve.

Description

A special oxygen shut-off valve for explosion-proof room

technical field

The invention belongs to the technical field of valve manufacturing, and relates to a shut-off valve applied to an oxygen pipeline, in particular to a special oxygen shut-off valve for an explosion-proof chamber.

Background technique

The oxygen pipeline valve is a high-risk valve. The oxygen valve cannot be installed near the use point of open flame and oil pollution, and should be located in an area that does not generate sparks; under normal circumstances, it is stipulated that an independent valve room or protective wall should be set for the oxygen regulating valve group. . Due to the strong combustion-supporting characteristics of oxygen and the analysis and summary of the experience and lessons of the reasons for the combustion and explosion of oxygen pipelines and valves, there are oxygen shut-off valves with large diameter, high pressure or special sealing requirements that are required by users to be installed in the separation wall or explosion-proof valve room to improve the safety of oxygen pipelines. Operation coefficient, if the remote-controlled oxygen shut-off valve is selected, the operation safety is the best, but in practical application, it is recommended to manufacture cost-saving, safe and reliable products. Therefore, designers in the field optimized the one-way sealing structure on the basis of the structure of the existing oxygen shut-off valve, and designed a valve with a combined structure extending through the wall, which skillfully solved the above objective problems.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a special oxygen shut-off valve for an explosion-proof chamber, which can reduce the opening force of the valve stem when the valve is opened, and ensure the safe operation of the oxygen pipeline valve.

To achieve the above object, the present invention provides the following technical solutions:

A special oxygen shut-off valve for an explosion-proof chamber, comprising a valve body, a valve disc, and a valve stem. The valve disc includes a main valve disc and a pilot valve disc. The outer edge of the bottom of the disc is sealed with the conical surface of the medium through hole in the valve body; the pilot disc is installed in the inner cavity of the main disc, and the bottom of the disc is sealed with the conical surface of the flow port at the bottom of the main disc, and the other end of the pilot disc and the valve stem Connected by T-slots; the upper end of the main valve disc is threadedly connected with the valve disc cover, and the valve stem is adapted to pass through the valve disc cover; the main valve disc and the pilot valve disc are gap-fitted.

After the upper end of the main valve flap is threadedly connected with the valve flap cover, screws are arranged symmetrically from both sides of the main valve flap.

There is a 1mm gap between the pilot disc and the valve stem.

The upper end of the valve rod is connected with the bevel gear mechanism through the bracket, the connecting rod of the bevel gear mechanism is connected with the extension rod combination structure, and the extension pipe of the extension rod combination structure is connected with the handwheel outside the partition wall. The opening and closing of the valve is controlled by operating the handwheel outside the wall.

The extension rod assembly structure is sequentially composed of a connecting sleeve, an extension pipe and a connecting shaft by socket welding to form an assembly.

The invention adopts the pressure balance valve disc structure, which reduces the valve opening force when the valve is opened, and at the same time maintains the pressure balance between the upper and lower parts of the valve disc, avoids the phenomenon of easy combustion when the oxygen shut-off valve is opened rapidly, and improves the safety factor of the oxygen pipeline valve. ; And under the temperature and pressure conditions specified by the user, it can meet the normal "high in and low out" positive sealing performance, and ensure the reverse sealing and positive sealing effect of the valve under the reverse action of the medium when the pipeline is cut off during maintenance. Consistent.

The invention is suitable for valves used in oxygen pipelines installed in partition walls or explosion-proof valve chambers.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the installation schematic diagram of the through-wall extension combined structure of the present invention;

3 is a partial enlarged view of the connection mode of the connecting rod and the extension rod combined structure of the bevel gear mechanism of the present invention;

4 is a schematic diagram of the combined structure of the extension rod of the present invention;

In the figure: 1- valve body, 2- main valve disc, 3- pilot valve disc, 4- valve stem, 5- valve disc cover, 6- screw d,

7-Octagonal pad, 8-bonnet, 9-bracket, 10-protective cover, 11-bevel gear mechanism, 12-extension rod combination structure, 13-handwheel, 14-key b, 15-bolt, 16-pad Sheet, 17-connecting rod, 18-key c, 19-screw e, 20-connecting sleeve, 21-extension tube, 22-connecting shaft.

Detailed ways

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

Please refer to Figure 1 and Figure 2, a special oxygen shut-off valve for explosion-proof chamber, including valve body 1 and main valve disc 2 using conical surface sealing, main valve disc 2 and pilot valve disc 3 adopting conical surface sealing form; pilot valve disc 3 It is connected with the valve stem 4 by a T-shaped groove, and the valve flap cover 5 is connected with the main valve flap 2 by threads. The two symmetrical sides of the main valve flap 2 are respectively provided with screws d6 to prevent the screw connection from loosening. The valve body 1 and the middle port of the valve cover 8 are sealed with an octagonal gasket 7; the valve cover 8 and the bracket 9 are connected by the first thread, and the second ring weld strengthens the connection. The structure is simple, the material is saved and the cost is reduced, and the double connection The superimposed use ensures firm and reliable connection; the middle of the valve rod 4 and the bracket 9 is provided with a guiding anti-rotation structure, and the window of the bracket 9 is marked with a protective cover 10 with obvious “no oil” mark; between the bevel gear mechanism 11 and the handwheel 13 There is an extension rod combination structure 12, the extension pipe 21 passes through the partition wall, and the opening and closing of the valve is controlled by operating the handwheel 13 outside the wall.

Please refer to Figure 1, the pressure balance disc structure composed of main disc 2, pilot disc 3 and valve stem 4, when the valve opens, the valve stem 4 lifts the pilot disc 3, and the medium enters from the balance hole to quickly ensure the pilot disc 3. The upper and lower pressures are balanced, and most of the medium flows into the main valve disc 2 channel and directly acts on the sealing pair of the main valve disc 2 and the valve body 1, which can reduce the valve opening force. When the valve is closed, the main valve disc 2 is sealed with the valve body 1 under the forcible action of the valve stem 4 to cut off the flow of the medium. The pilot valve disc 3 and the valve stem 4 are connected by a T-slot and designed with a gap of 1mm, which can automatically adjust the centering position of the valve disc, so that the valve disc can achieve the best sealing effect. This structure reduces the opening force of the valve stem when the valve is opened; ensures that the upper and lower parts of the valve flap maintain pressure balance when the oxygen shut-off valve is opened; if the oxygen shut-off valve does not reach the pressure balance, rapid opening may lead to combustion. And under the temperature and pressure conditions specified by the user, it satisfies the conventional "high in and low out" positive sealing performance; when the medium acts in the reverse direction, the diameter of the valve stem 4 is large enough, and the reverse sealing of the valve is good; therefore, two-way sealing is realized. .

Please refer to FIG. 2 and FIG. 3 , the connecting rod 17 of the bevel gear mechanism and the extension rod combined structure 12 are connected by a key c18 on one side to prevent rotation, and the screw e19 on one side is symmetrically tightened; the extension rod combined structure 12 is connected with the hand The hub of wheel 13 is connected by key b14, and the connection method of bolt 15 and gasket 16 is tightened; the extension rod is fixed on the partition wall, and the hand wheel is placed outside the wall for operation, which can effectively protect the life safety of operators and improve the safety of oxygen pipeline valves. Safety in use to achieve safe and reliable operation of the oxygen system.

Please refer to FIG. 4 , the extension rod assembly structure 12 is composed of a connecting sleeve 20 , an extension tube 21 , and a connecting shaft 22 using socket welding to form an assembly; according to user regulations, the length of the extension rod assembly structure is guaranteed to be reasonable; the extension rod assembly The structural strength design is enough to keep the extension rod combined structure from being deformed and falling off during the long-term operation of the valve.

Claims (5)

1. The utility model provides a special oxygen stop valve of explosion-proof room, includes the valve body, the valve clack, the valve rod, its characterized in that: the valve clack comprises a main valve clack (2) and a pilot valve clack (3), a flow port is formed at the bottom of the main valve clack (2), a balance hole is formed in the side wall of the main valve clack, and the outer edge of the bottom of the main valve clack (2) is sealed with a medium via hole conical surface in the valve body (1); the pilot valve clack (3) is arranged in the inner cavity of the main valve clack (2), the bottom of the pilot valve clack is sealed with the conical surface of a flow opening at the bottom of the main valve clack (2), and the other end of the pilot valve clack (3) is connected with the valve rod (4) through a T-shaped groove; the upper end of the main valve flap (2) is in threaded connection with the valve flap cover (5), and the valve rod (4) is matched and penetrates out of the valve flap cover (5); the main valve clack (2) and the pilot valve clack (3) are in clearance fit.

2. The special oxygen stop valve for explosion-proof chamber of claim 1, wherein: after the upper end of the main valve flap (2) is in threaded connection with the valve flap cover (5), screws d (6) are symmetrically arranged on two side faces of the main valve flap (2).

3. The special oxygen stop valve for explosion-proof chamber of claim 1, wherein: a1 mm gap is arranged between the pilot valve clack (3) and the valve rod (4).

4. The special oxygen stop valve for explosion-proof chamber of claim 1, wherein: the upper end of the valve rod (4) is connected with the bevel gear mechanism (11) through the bracket (9), the connecting rod (17) of the bevel gear mechanism (11) is connected with the extension rod combined structure (12), and the extension pipe (21) of the extension rod combined structure (12) is connected with the hand wheel (13) outside the partition wall.

5. The special oxygen stop valve for explosion-proof chamber of claim 4, wherein: the extension rod combined structure (12) is formed by a combined part which is formed by a connecting sleeve (20), an extension pipe (21) and a connecting shaft (22) in a socket welding mode in sequence.

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