CN204239922U - A kind of ground lower contact of applying in fuel gas transportation pipeline - Google Patents

Abstract

The utility model discloses an underground joint used in gas conveying pipelines, which comprises a main pipe body, an inner supporting sleeve and a gland. The space is fixed by screw connection, the diameter of the other end of the gland is smaller than the diameter of the main body, the inner wall of the main body is provided with a snap ring, the snap ring is located on the inner wall of the inner main body, and the inner support sleeve is installed in the main body. There is a predetermined gap between the support sleeve and the inner wall of the main pipe, and the main pipe is provided with a threaded hole for filling glue and sealed by a plug. The utility model can be well connected with steel pipelines and steel-plastic conversion pipe fittings through threads. At the same time, after the steel-plastic conversion pipe fitting is connected to the ground joint, the steel-plastic conversion pipe fitting is further fixed by pouring glue. In addition, the glue filling also protects the steel-plastic conversion pipe fittings, and the steel-plastic conversion pipe fittings are not easily damaged when they are used in harsh environments.

Description

An underground joint used in gas transmission pipeline

technical field

The utility model relates to the gas transmission pipeline technology, in particular to an underground joint used in the gas transmission pipeline.

Background technique

Steel-plastic conversion fittings are widely used in the transportation process of gas pipelines and water supply pipelines. Relevant national engineering regulations stipulate that plastic pipes cannot be directly connected to the user end. Therefore, after the polyethylene gas pipeline is pressure-regulated, steel-plastic conversion pipe fittings are required to complete the grid-connection of the household and ventilated steel pipelines and polyethylene pipelines.

Most of the steel-plastic conversion pipe fittings are buried underground for use, and the wall thickness of the polyethylene gas pipe becomes thinner due to extrusion at the junction with the high-speed conversion parts, resulting in a decrease in the axial pullout force of the steel-plastic conversion pipe fittings. As a result, when steel-plastic conversion pipe fittings are used under relatively harsh environmental conditions, their tensile performance and sealing performance cannot be guaranteed, making the buried gas pipeline system a potential safety hazard. Therefore, the technical requirements for the steel-plastic conversion pipe fittings of the gas transmission pipeline are also getting higher and higher. An underground joint used in gas transmission pipelines is invented, which is used to connect steel-plastic conversion pipe fittings and polyethylene pipelines.

Contents of the invention

The technical problem to be solved by the utility model is to provide an underground joint used in gas transmission pipelines.

The technical solution adopted by the utility model to solve the above-mentioned technical problems is: an underground joint used in a gas transmission pipeline, including a main body, an inner support sleeve and a gland, and both ends of the main body are provided with threads , one end of the gland is provided with threads and is fixed to the main body through a threaded connection, the diameter of the other end of the gland is smaller than the diameter of the main body, and the inner wall of the main body is provided with a card ring, the snap ring is located on the inner wall of the inner main body, the inner support sleeve is installed in the main body, there is a predetermined gap between the inner support sleeve and the inner wall of the main body, and the main main body There is a threaded hole for glue filling and it is sealed by a plug;

The polyethylene gas pipe and one end of the main body are fixed by threaded connection, the steel-plastic conversion pipe fitting is inserted into the main body from the other end of the main body, and the steel-plastic conversion pipe is clamped in the main body through the gland, and the steel-plastic conversion pipe is inserted into the main body. It is located between the inner support sleeve and the inner wall of the main body. At this time, the plug is opened to fill the main body with glue from the threaded hole. The glue fills the gap between the steel-plastic conversion pipe fitting and the main body and then tightens the plug.

One end of the main body is provided with an O-ring, and the O-ring is located in the main body, and one end of the inner support sleeve is provided with a limiting ring, and the diameter of the limiting ring is larger than the diameter of the inner support sleeve. The above-mentioned limit ring is located between the gland and the snap ring, and a sealing and locking fixing ring is arranged between the above-mentioned limiting ring and the snap ring, and the sealing and locking fixing ring clamps the inner support sleeve on the main tube in vivo. After the steel-plastic conversion pipe fitting is inserted into the main body, the sealing and locking fixing ring simultaneously plays a role in fixing the steel-plastic conversion pipe fitting, making it difficult for relative positions to occur.

A transitional gland ring is arranged in the main body, and the transitional gland ring is installed between the O-ring and the sealing and locking fixing ring, and the transitional gland ring corresponds to the limiting ring. The transition gland ring is located between the right pipe body and the sealing and locking fixing ring, which acts as a buffer, and at the same time corresponds to the limit ring, which can better install the inner support pipe.

A metal sealing ring is arranged between the main main body and the gland, and the metal sealing ring is closely attached to the side wall of the main body, and a clamping ring is arranged in the gland, and the clamping ring A gasket is provided between the metal sealing ring. The gasket is located between the metal sealing ring and the clamping ring, and plays a role of fixing and cushioning.

The inner wall of the left end of the main body is provided with threads fixedly connected with the polyethylene gas pipe, and the outer wall of the right end of the main body is provided with threads fixedly connected with the gland. The left and right ends of the main body are provided with threads for fixedly connecting the gland and the steel-plastic conversion pipe fitting.

The inner wall of the left end of the gland is provided with threads, and one end of the gland is fixed to the right end of the main body in a threaded manner. The gland is connected with the main body, and can clamp the steel-plastic conversion pipe fitting in the main body.

Compared with the prior art, the utility model has the advantage that an underground joint is connected between the polyethylene gas pipe and the steel-plastic conversion pipe fitting, and the two ends of the underground joint can be well connected through threads at both ends. After the steel-plastic conversion pipe fitting is connected to the underground joint, the steel-plastic conversion pipe fitting is further fixed by filling glue. At the same time, glue filling also protects the steel-plastic conversion pipe fittings, even if the steel-plastic conversion pipe fittings are used in a relatively harsh environment, they are not easily damaged. The technical requirements of the steel-plastic conversion pipe fittings are reduced, so that the steel-plastic conversion pipe fittings can be used in harsh environments.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

The utility model is described in further detail below in conjunction with the accompanying drawings.

As shown in Figure 1: an underground joint used in gas transmission pipelines, including a main body 5, an inner support sleeve 6 and a gland 1, both ends of the main body 5 are provided with threads, and one end of the gland 1 is provided It is threaded and fixed with the main body 5 by threaded connection. The diameter of the other end of the gland 1 is smaller than the diameter of the main body 5. The inner wall of the main body 5 is provided with a snap ring 11, and the snap ring 11 is located in the inner main body 5. On the inner wall of the main body, the inner support sleeve 6 is installed in the main body 5, there is a predetermined gap between the inner support sleeve 6 and the inner wall of the main body 5, and the main body 5 is provided with a threaded hole 12 for glue filling and through the plug 10 sealed;

The polyethylene gas pipe and one end of the main body 5 are fixed by screw connection, the steel-plastic conversion pipe is inserted into the main body 5 from the other end of the main body 5 and the steel-plastic conversion pipe is stuck in the main body 5 through the gland 1, and the steel-plastic conversion pipe is inserted into the main body 5 through the gland 1. The part where the conversion pipe is inserted into the main body 5 is located between the inner support sleeve 6 and the inner wall of the main body 5. At this time, the plug 10 is opened to fill the main body 5 with glue at the threaded hole 12, and the glue is filled with the steel-plastic conversion pipe and the inner wall of the main body 5. Tighten the plug 10 after the gap between the main body 5.

One end of the main pipe body 5 is provided with an O-ring 9, and the O-ring 9 is located in the main pipe body 5, and one end of the inner support sleeve 6 is provided with a limit ring 13, and the diameter of the limit ring 13 is larger than the diameter of the inner support sleeve 6 to limit The position ring 13 is located between the gland 1 and the snap ring 11, and the sealing and locking fixing ring 7 is arranged between the limiting ring 13 and the snap ring 11, and the sealing and locking fixing ring 7 clamps the inner support sleeve 6 on the main pipe body within 5. A transition gland ring 8 is arranged inside the main body 5, and the transition gland ring 8 is installed between the O-ring 9 and the sealing and locking fixing ring 7, and the transition gland ring 8 corresponds to the limit ring 13.

A metal sealing ring 4 is arranged between the main body 5 and the gland 1, and the metal sealing ring 4 is closely attached to the side wall of the main body 5. A clamping ring 2 is arranged in the gland 1, and the clamping ring 2 and the metal sealing ring Spacers 3 are arranged between the 4. The inner wall of the left end of the main body 5 is provided with threads fixedly connected with the polyethylene gas pipe, and the outer wall of the right end of the main body 5 is provided with threads fixedly connected with the gland 1 . The inner wall of the left end of the gland 1 is provided with threads, and one end of the gland 1 is fixed to the right end of the main body 5 in a threaded manner.

Claims (6)

1. a ground lower contact of applying in fuel gas transportation pipeline, it is characterized in that comprising main pipe, inner support sleeve pipe and gland, described main pipe two ends are provided with screw thread, one end of described gland be provided with screw thread and and be threaded connection mode between main pipe and fix, the bore of the other end of described gland is less than the bore of main pipe, the inwall of described main pipe is provided with snap ring, described snap ring is positioned on the inwall of main pipe, described inner support pipe box is arranged in main pipe, predetermined gap is there is between described inner support pipe box and main pipe's inwall, described main pipe is provided with the tapped hole for encapsulating and is sealed by plug,

Polyethylene gas pipe and main pipe one end are fixed with thread connecting mode, steel is moulded conversion pipe fitting and to be inserted in main pipe by the other end of main pipe and by gland, steel is moulded conversion pipe fitting and be stuck in main pipe, steel is moulded conversion pipe fitting and is inserted part in main pipe between inner support sleeve pipe and main pipe's inwall, now open plug and carry out encapsulating by tapped hole in main pipe, colloid is full of after the gap of changing between pipe fitting and main pipe moulded by steel and screws plug.

2. a kind of ground lower contact of applying in fuel gas transportation pipeline according to claim 1, it is characterized in that one end of described main pipe is provided with O shape circle, described O shape circle is positioned at main pipe, one end of inner support pipe box is provided with limited ring, described limited ring diameter is greater than the diameter of inner support pipe box, described limited ring is between gland and snap ring, be provided with the fastening fixed ring of dense block between described limited ring and snap ring, inner support pipe box is clamped in main pipe by the fastening fixed ring of described dense block.

3. a kind of ground lower contact of applying in fuel gas transportation pipeline according to claim 2, it is characterized in that being provided with transition gland ring in described main pipe, described transition gland ring is arranged between O shape circle and the fastening fixed ring of dense block, and described transition gland ring is corresponding with described limited ring.

4. a kind of ground lower contact of applying in fuel gas transportation pipeline according to claim 1, it is characterized in that being provided with metallic packing ring between described main pipe and gland, described metallic packing ring is close on the sidewall of main pipe, be provided with screens ring in described gland, between described screens ring and metallic packing ring, be provided with pad.

5. a kind of ground lower contact of applying in fuel gas transportation pipeline according to claim 1, the inwall that it is characterized in that the left end of main pipe is provided with the screw thread be fixedly connected with polyethylene gas pipe, the outer wall of the right-hand member of described main pipe is provided with the screw thread be fixedly connected with gland.

6. a kind of ground lower contact of applying in fuel gas transportation pipeline according to claim 5, it is characterized in that the madial wall of described gland left end is provided with screw thread, one end of gland is fixed in the mode be threaded with the right-hand member of main pipe.