CN204961865U - Weld adiabatic for gas cylinder stop valve - Google Patents

Abstract

The utility model discloses a cut-off valve for welding heat-insulating gas cylinders, which comprises a valve body, a valve stem is arranged in the valve body, the valve stem protrudes from the upper end surface of the valve body, and a pressing valve is arranged on the upper end surface of the valve body. Tight cap, a tapered sealing ring and a V-shaped sealing ring are sleeved between the compression cap and the valve stem, and the described tapered sealing ring is arranged below the V-shaped sealing ring, and the described tapered sealing ring , V-shaped sealing ring and the valve stem are sealed respectively; a compression block is installed in the gap between the compression cap above the V-shaped sealing ring and the valve stem, and a manual valve is arranged above the compression block. Wheel, the valve stem passes through the handwheel and the upper end is provided with a support cap, a spring is provided between the handwheel and the support cap, the lower end of the spring abuts against the upper end of the handwheel, and the upper end abuts against the support cap. The utility model utilizes spring compression elastic force to make the sealing element sleeved on the valve stem always in the state of tension and pressure, so as to ensure that the valve will not produce external airtight leakage when the valve is in the open state.

Description

Globe valves for welded insulating gas cylinders

technical field

The utility model relates to a cut-off valve for welding heat-insulating gas cylinders.

Background technique

At low temperature of -196°C, the globe valve commonly used in China for welded and insulated gas cylinders will suffer from low-temperature brittle damage to the internal sealing elements of the valve, and when the valve is in an open state, external airtight leakage will occur.

Contents of the invention

In order to overcome the defect of low temperature brittle damage of the sealing element inside the valve at low temperature -196°C of the existing stop valve for welded heat insulating gas cylinder, the utility model provides a kind of can effectively solve the problem that the stop valve for welded heat insulating gas cylinder can be used at low temperature -196°C. Globe valves for welded insulated gas cylinders with low-temperature brittle failure of the internal sealing elements of the valve at ℃.

The technical scheme that the utility model adopts is:

The shut-off valve for welding insulated gas cylinders includes a valve body, and a valve stem is arranged in the valve body. The compression cap is set on the valve stem; a conical sealing ring and a V-shaped sealing ring are set between the compression cap and the valve stem, and the conical sealing ring is arranged on the V-shaped sealing ring. Below, the tapered sealing ring and the V-shaped sealing ring are sealed with the valve stem respectively; a compression block is installed in the gap between the compression cap and the valve stem above the V-shaped sealing ring, so that A hand wheel is provided above the pressing block, the valve stem passes through the hand wheel and the upper end is provided with a support cap, a spring is provided between the hand wheel and the support cap, and the lower end of the spring is connected to the support cap. The upper end of the hand wheel abuts against the support cap.

The valve stem located in the compression cap is provided with a valve stem sealing control surface, and has a circle of radially outward integrally formed first annular flange; the bottom of the tapered sealing ring has a circle The radially outward integrally formed second annular flange, the bottom of the second annular flange is in contact with the top of the first annular flange; the inner ring of the tapered sealing ring is in contact with the valve stem sealing control surface contact; the inner ring of the compression cap has a first compression cap sealing control surface in contact with the conical surface of the tapered sealing ring, and the bottom of the first compression cap sealing control surface abuts against the second on the ring flange.

Both sides of the inner ring of the V-shaped sealing ring have a V-shaped structure that is compatible with the sealing control surface of the valve stem. The V-shaped structure includes an upper cone surface and a lower cone surface. The V-shaped seal The inner ring of the ring is in contact with the sealing control surface of the valve stem. The compression cap above the first compression cap sealing control surface is provided with a second compression cap sealing control surface in contact with the lower cone surface. The bottom of the compacting block has a compacting block sealing control surface adapted to the shape of the upper conical surface.

An anti-block gasket is arranged between the hand wheel and the pressing block.

The utility model utilizes the compression elastic force of the spring. When the hand wheel rotates to open the valve, the conical sealing ring is stretched upward by the valve stem, and the V-shaped sealing ring is pressed downward by the compression block. At the same time, the conical sealing ring and the V The cone seal is squeezed by the reverse support of the compression cap, so that the valve stem is always sealed with the cone seal and the V seal.

The beneficial effect of the utility model is reflected in that: the sealing element sleeved on the valve stem is always in a state of tension and compression by using the spring compression elastic force, so as to ensure that the valve will not produce external airtight leakage when the valve is in the open state.

Description of drawings

Fig. 1 is a structural schematic diagram of a shut-off valve for welding adiabatic gas cylinders of the present invention.

Fig. 2 is a schematic diagram of the structure of the V-shaped sealing ring of the present invention.

Fig. 3 is a structural schematic diagram of a tapered sealing ring of the present invention.

Fig. 4 is a schematic diagram of the structure of the valve stem of the present invention.

Fig. 5 is a structural schematic diagram of the pressing block of the utility model.

Fig. 6a is a schematic diagram of the structure of the pressing cap of the present invention.

Fig. 6b is an enlarged view of A in Fig. 6a.

detailed description

Referring to Figures 1 to 6b, the stop valve for welding insulated gas cylinders includes a valve body 1, and a valve stem 2 is arranged inside the valve body 1, and the valve stem 2 protrudes from the upper end surface of the valve body 1, and the valve body The upper end surface of 1 is provided with a compression cap 8, and the compression cap 8 is sleeved on the valve stem 2; between the compression cap 8 and the valve stem 2, a conical sealing ring 3 and a V-shaped Sealing ring 4, the tapered sealing ring 3 is arranged below the V-shaped sealing ring 4, and the described tapered sealing ring 3 and the V-shaped sealing ring 4 are sealed with the valve stem 2 respectively; A compression block 5 is installed in the gap between the compression cap and the valve stem above the sealing ring 4, a hand wheel 6 is arranged above the compression block 5, and the valve stem 2 passes through the hand wheel 6 and the upper end A support cap is provided at the end, and a spring 7 is provided between the handwheel 6 and the support cap. The lower end of the spring 7 abuts against the upper end of the handwheel 6, and the upper end abuts against the support cap.

The valve stem located in the compression cap is provided with a valve stem sealing control surface 22, and has a radially outward integrally formed first annular flange 21; the bottom of the tapered sealing ring 3 There is a radially outward integrally formed second annular flange 32, the bottom of the second annular flange 32 is in contact with the top of the first annular flange 21; The ring 33 is in contact with the valve stem sealing control surface 22; the inner ring of the compression cap 8 has a first compression cap sealing control surface 81 in contact with the conical surface 1 of the conical sealing ring 3, and the second A bottom 83 of a compression cap sealing control surface 81 abuts against the second annular flange 32 .

Both sides of the inner ring 43 of the V-shaped sealing ring 4 have a V-shaped structure that is compatible with the valve stem sealing control surface 22, and the V-shaped structure includes an upper cone surface 41 and a lower cone surface 42, The inner ring of the V-shaped sealing ring 4 is in contact with the valve stem sealing control surface 22, and the compression cap above the first compression cap sealing control surface 81 is provided with a second compression cap in contact with the lower tapered surface 42. The pressing cap seals the control surface 82 , and the bottom of the pressing block 5 has a pressing block sealing control surface 51 matching the shape of the upper cone surface 41 .

An anti-block gasket is arranged between the hand wheel 6 and the pressing block 5 .

The utility model utilizes the compression elastic force of the spring. When the hand wheel rotates to open the valve, the conical sealing ring is stretched upward by the valve stem, and the V-shaped sealing ring is pressed downward by the compression block. At the same time, the conical sealing ring and the V The cone seal is squeezed by the reverse support of the compression cap, so that the valve stem always maintains the seal with the cone seal and the V seal.

The content described in the embodiments of this specification is only an enumeration of the implementation forms of the inventive concept, and the protection scope of the present utility model should not be regarded as limited to the specific forms stated in the embodiments, and the protection scope of the present utility model also extends to this invention. Those skilled in the art can think of equivalent technical means according to the concept of the utility model.

Claims (4)

1. welded insulated gas cylinder stop valve, comprises valve body, is provided with valve rod in valve body, it is characterized in that: described valve rod stretches out the upper-end surface of valve body, and the upper-end surface of described valve body is provided with clamping cap, and described clamping cap is set on valve rod; Be arranged with conical seal ring and V-shaped seal ring between described clamping cap and valve rod, described conical seal ring is arranged on the below of V-shaped seal ring, and described conical seal ring, V-shaped seal ring coordinate with valve stem seal respectively; In clamping cap above described V-shaped seal ring and the space between valve rod, compact heap is installed, the top of described compact heap is provided with handwheel, described valve rod is through handwheel and end, upper end is provided with support cap, spring is provided with between described handwheel and support cap, the lower end of described spring abuts with handwheel upper end, and upper end is connected to and supports on cap.

2. welded insulated gas cylinder stop valve as claimed in claim 1, is characterized in that: the valve rod being positioned at described clamping cap is provided with valve stem seal chain of command, and has radially outer integrated first annular flange flange of a circle; The bottom of described conical seal ring has radially outer integrated second annular flange flange of a circle, the bottom of the second described annular flange flange and the top contact of the first annular flange flange; The inner ring of described conical seal ring contacts with valve stem seal chain of command; The inner ring of described clamping cap has the first clamping cap contacted with the conical surface of described conical seal ring and seals chain of command, and the bottom of the first clamping cap sealing chain of command is connected in the second annular flange flange.

3. welded insulated gas cylinder stop valve as claimed in claim 2, it is characterized in that: the both sides of the inner ring of described V-shaped seal ring have the V-shape structure suitable with valve stem seal chain of command, described V-shape structure comprises the conical surface and the lower conical surface, the inner ring of described V-shaped seal ring contacts with valve stem seal chain of command, clamping cap above the first described clamping cap sealing chain of command is provided with the second clamping cap contacted with the lower conical surface and seals chain of command, the bottom of described compact heap has the compact heap suitable with upper conical surface shape and seals chain of command.

4. welded insulated gas cylinder stop valve as claimed in claim 3, is characterized in that: be provided with between described handwheel and compact heap and deter pad.