CN204372391U - A kind of pressure test pipeline conversion adapter - Google Patents

Abstract

A pipeline adapter for pressure testing, the utility model belongs to the pipeline joint, which solves the problem that the existing pipeline adapter is easy to cause damage to the sealing surface of the spherical joint of the connecting conduit. The utility model includes a transfer pipe, 2 O-shaped sealing rings and 2 casing nozzles; the axial center through hole of the transfer pipe is sequentially composed of an upper hole, a middle hole and a lower hole from top to bottom. The bottom of the orifice and the connection between the bottom of the orifice and the middle hole have upper and lower annular grooves around the middle hole; O-rings are embedded in the upper and lower annular grooves; The casing nozzle made of fluoroethylene material presses the O-ring. The utility model has a non-metallic soft sealing structure. Since the sleeve nozzle is made of polytetrafluoroethylene material, the material has low hardness and good elasticity, and will not cause damage to the connecting conduit interface during the test, and the pre-tightening force is small, and the operation is labor-saving, which is safe for the connection. The thread of the conduit casing nut has little damage and is suitable for pressure testing of products.

Description

A pipeline adapter for pressure test

technical field

The utility model belongs to pipeline joints, in particular to a pipeline adapter for pressure tests, which is used for pressure tests of products.

Background technique

The gas circuit components mainly include gas cylinders, connecting conduits, various valves (globe valves, throttle valves, safety valves, pressure reducing valves, etc.), pressure gauges and terminal functional devices (cylinders, nozzles, etc.). After the gas circuit components are assembled, airtight tests and various functional tests are required. During the test, process adapters and pipeline adapters are used to connect with the nozzles of the gas circuit components, and then filled with gas at a specified pressure for testing.

As shown in Figure 1, the left end of the connecting conduit 10 of some air circuit components has a left spherical head 11 and a left outer casing nut 12, and the right end has a right spherical head 13 and a right outer casing nut 14, and the test pipeline adapter connected to it is as As shown in Figure 2, it is a rotating body with an axial center through hole. The middle part of its outer surface has a hexagonal boss for cooperating with a wrench. The upper and lower sides of the hexagonal boss have an upper connecting thread section and a lower connecting thread section respectively. The upper and lower openings of the axial center through hole of the rotating body are tapered holes.

When using the existing pipeline adapter to connect two connecting conduits, the outer casing nut at one end of the connecting conduit is threadedly connected to the upper connecting threaded section of the pipeline adapter, and the spherical head is pressed against the upper hole of the pipeline adapter to form a Ball joint-tapered hole sealing structure, and the lower orifice of the other connecting conduit and pipeline adapter is connected in the same way as above to form a ball joint-tapered hole sealing structure. Due to the metal hard sealing structure, the test In the end, it will generally leave an imprint on the ball joint of the connecting conduit, and because the pipeline adapter is a product that is repeatedly used, its conical sealing surface will deteriorate after long-term use. In order to ensure the airtight connection during the test, the operator often passes Increase the tightening force to ensure airtightness, which is more likely to cause damage to the sealing surface of the connecting conduit ball joint.

Contents of the invention

The utility model provides a pressure test pipeline adapter, which solves the problem that the existing pipeline adapter easily causes damage to the sealing surface of the spherical joint of the connecting conduit.

A pipeline adapter for pressure test provided by the utility model includes an adapter pipe, two O-shaped sealing rings and two casing nozzles; the adapter pipe is a rotating body with an axial center through hole, and There is a hexagonal boss in the middle of the outer surface, which is used to cooperate with a wrench. The upper and lower sides of the hexagonal boss have an upper connecting thread section and a lower connecting thread section respectively. It is characterized in that:

The axial center through hole of the transfer pipe is sequentially composed of an upper hole, a middle hole and a lower hole from top to bottom, the upper hole, the middle hole and the lower hole are coaxial cylindrical holes, and the upper hole and the inner diameter of the lower orifice is greater than the inner diameter of the middle section, and the connection between the bottom of the upper orifice and the bottom of the lower orifice and the middle hole has an upper annular groove and a lower annular groove around the middle hole respectively; the upper annular groove and the lower annular groove O-rings are respectively embedded in them;

The upper orifice and the lower orifice are respectively embedded with sleeve nozzles, which press the O-shaped sealing ring; the sleeve nozzles are made of polytetrafluoroethylene material, which is a cylinder with an axial center through hole. The axial central through hole is formed by connecting a conical hole and a cylindrical hole.

The size of the upper opening and the lower opening of the axial central through hole of the transfer pipe may be the same.

The sealing structure of the utility model is a non-metallic soft sealing structure. Since the sleeve nozzle is made of polytetrafluoroethylene material, the material has low hardness and good elasticity, and the test will not cause damage to the connection conduit interface of the gas circuit components, and the pre-tightening force is small , labor-saving operation, less damage to the thread of the air circuit component interface.

The utility model is suitable for the sealing of the spherical joint interface of the gas circuit element connecting the conduit, and the applicable conditions are as follows:

a. Nominal pressure: no more than 30MPa;

b. Medium temperature: -45℃～+100℃;

c. Working medium: air, HY-8, YH-10.

Description of drawings

Fig. 1 is a schematic diagram of connecting conduits of gas path components;

Figure 2 is a schematic diagram of an existing adapter;

Fig. 3 is the structural representation of the utility model;

Fig. 4 (A) is the schematic diagram of transfer tube;

Fig. 4 (B) is the top view of Fig. 4 (A);

Figure 5 is a schematic diagram of the casing nozzle.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 3, the pressure test pipeline adapter provided by the utility model includes an adapter pipe 20, two O-rings 30 and two sleeve nozzles 40;

As shown in Figure 4(A) and Figure 4(B), the transfer tube 20 is a rotating body with an axial center through hole, and the middle part of its outer surface has a hexagonal boss 21 for matching with a wrench, the hexagonal The upper and lower sides of the boss respectively have an upper connecting thread segment 22 and a lower connecting thread segment 23;

The axial central through hole of the transfer pipe 20 is composed of an upper orifice 24, a middle hole 25 and a lower orifice 26 from top to bottom, and the upper orifice 24, the middle hole 25 and the lower orifice 26 are coaxial. Cylindrical hole, the inner diameter of the upper orifice 24 and the lower orifice 26 is greater than the inner diameter of the middle section 25, the connection between the bottom of the upper orifice 24 and the bottom of the lower orifice 26 and the middle section hole 25 has an upper annular groove 24A around the middle section hole 25 and the lower annular groove 26A; O-ring seals 30 are respectively embedded in the upper annular groove 24A and the lower annular groove 26A;

The upper orifice 24 and the lower orifice 26 are respectively embedded with sleeve nozzles 40, which press the O-shaped sealing ring 30; as shown in Figure 5, the sleeve nozzles 40 are made of polytetrafluoroethylene material, It is a cylinder with an axial central through hole, and its axial central through hole is formed by communicating with a conical hole 41 and a cylindrical hole 42 .

The size of the upper opening 24 and the lower opening 26 of the axial central through hole of the transfer pipe 20 may be the same.

In the embodiment of the utility model, the transfer pipe is made of 1Cr18Ni9Ti steel, which is quenched into austenite; it can also be made of aluminum alloy. The O-shaped sealing ring is a rubber ring, which meets the requirements of the national standard GB/T3452.1-1992.

Claims (2)

1. a pressure test pipeline conversion adapter, comprises transfer tube (20), 2 O-ring seals (30) and 2 cannula nozzles (40); Described transfer tube (20), for having the solid of rotation of axial central through hole, its outer surface intermediate portion has six side's boss (21), for coordinating with spanner, the six upper and lower both sides of side's boss have upper connecting thread section (22) and lower connecting thread section (23) respectively, it is characterized in that:

The axial central through hole of described transfer tube (20) is from top to bottom successively by upper aperture (24), middle sector hole (25) is communicated with formation with lower aperture (26), upper aperture (24), middle sector hole (25) and lower aperture (26) are coaxial cylindrical hole, the internal diameter in upper aperture (24) and lower aperture (26) is greater than the internal diameter of intermediate section (25), (24) end, upper aperture and (26) end, lower aperture and middle sector hole (25) joint have upper annular groove (24A) and lower annular groove (26A) respectively around middle sector hole (25), O-ring seals (30) is embedded with respectively in upper annular groove (24A) and lower annular groove (26A),

Be embedded with cannula nozzle (40) respectively in described upper aperture (24) and lower aperture (26), O-ring seals (30) is pushed down; Described cannula nozzle (40) adopts polytetrafluoroethylmaterial material to make, and for having the cylindrical body of axial central through hole, its axial central through hole to be communicated with cylindrical hole (42) by conical bore (41) and to form.

2. pressure test pipeline conversion adapter as claimed in claim 1, is characterized in that:

Upper aperture (24) and the lower aperture (26) of described transfer tube (20) axial central through hole are measure-alike.