Quick connecting device for directly buried heat preservation pipe

Abstract

This utility model provides a quick connection device for directly buried insulated pipes, relating to the field of directly buried insulated pipe connection technology. It includes: a directly buried insulated pipe body, with a steel pipe inner layer disposed inside the body; an outer pipe connector is connected between the directly buried insulated pipe bodies; a pipe clamp is fixed to the outer end face of the outer pipe connector by fastening bolts; an adhesive injection groove is opened inside the outer pipe connector; an inner pipe connector is welded to the inner side of the outer pipe connector; the inner side of the inner pipe connector is filled with an insulating rock wool layer and a vacuum insulation board; the inner pipe connector is tightly attached to the inner wall and side wall of the steel pipe inner layer by a first sealing gasket and a second sealing gasket; an expansion alloy ring is disposed between the inner pipe connector and the first sealing gasket. This utility model solves the problem in the prior art where the connector between two sets of directly buried insulated pipes causes discontinuous insulation and is prone to accidental occurrences that affect the insulation performance of the directly buried insulated pipe.

Description

Technical Field

[0001] This utility model relates to the field of direct-buried insulated pipe connection technology, specifically to a quick connection device for direct-buried insulated pipes. Background Technology

[0002] Direct-buried insulated pipes are widely used in liquid and gas transmission networks, offering advantages such as reduced project costs, low heat loss, energy saving, corrosion resistance, good insulation performance, long service life, small footprint, and environmental benefits. Currently, to increase the length of insulated pipes, connectors are used to connect two pipes, thereby extending the component length. A search revealed existing technology (Publication No.: CN201820197473.9) for a quick-connect device for direct-buried insulated pipes. The document describes inserting two direct-buried insulated pipes into the connector, causing the moving rod to compress the spring and retract. The moving rod moves within a groove on the inner wall of the connector to prevent rotation. When the moving rod reaches the opening, it returns under the spring's elastic force. The rod pops out from the opening and locks in place, making the connection between the first and second direct-buried insulation pipes more tight and convenient to use. When disassembly is required, the screw is rotated and lowered inside the threaded pipe by rotating the handle, which causes the pressure plate to press the moving rod into the groove. At this time, the first and second direct-buried insulation pipes can be separated. However, in the existing technology, the plug-in connector between the two sets of direct-buried insulation pipes causes discontinuous insulation and is prone to accidental occurrences that affect the insulation performance of the direct-buried insulation pipes. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, a quick connection device for direct-buried insulated pipes is provided to solve the problem that the connection between two sets of direct-buried insulated pipes in the existing technology causes discontinuous insulation and is prone to accidental occurrences that affect the insulation performance of the direct-buried insulated pipes.

[0004] To achieve the above objectives, a quick connection device for directly buried insulated pipes is provided, comprising: a directly buried insulated pipe body, wherein a steel pipe inner layer is provided on the inner side of the directly buried insulated pipe body. The direct-buried insulated pipe bodies are connected by an outer pipe fitting. The outer end face of the outer pipe fitting is fixed with a pipe clamp by fastening bolts. An injection groove is opened inside the outer pipe fitting. An inner pipe fitting is welded to the inner side of the outer pipe fitting. The inner side of the inner pipe fitting is filled with an insulating rock wool layer and a vacuum insulation board. The inner pipe fitting is tightly attached to the inner wall and side wall of the steel pipe through a first sealing gasket and a second sealing gasket. An expansion alloy ring is provided between the inner pipe fitting and the first sealing gasket.

[0005] Furthermore, the direct-buried insulated pipe body is provided with an inner steel pipe layer and an outer insulation layer from the inside out, and the outer pipe surface of the inner steel pipe layer is screwed to the inner thread of the outer pipe fitting through the external thread.

[0006] Furthermore, the left and right ends of the outer pipe connector are attached to the body of the direct-buried insulation pipe through elastic pads, and the left and right ends of the outer pipe connector are inserted into and sleeved with the outer insulation layer.

[0007] Furthermore, a nano-aerogel felt is surrounded by a groove on the outer circumference of the outer pipe fitting, and pipe clamps are fixed at both ends of the nano-aerogel felt.

[0008] Furthermore, the outer tube connector has an arc-shaped glue injection groove inside, and the outer end wall of the glue injection groove has a glue injection hole; and the surface of the glue injection hole is covered with a nano aerogel felt.

[0009] Furthermore, the inner wall of the glue injection groove is provided with glue outlet holes; and the glue outlet holes are located at the internal thread end of the outer tube connector.

[0010] Furthermore, expansion alloy rings are welded to the outer pipe surfaces at the left and right ends of the inner pipe connector, and a first sealing gasket is bonded to the surface of the expansion alloy ring.

[0011] The beneficial effects of this utility model are as follows: the quick connection device for direct-buried insulated pipes utilizes welded integrated outer and inner pipe fittings to connect and screw into the ends of two sets of direct-buried insulated pipes, achieving a double-layered quick connection device. The inner pipe fitting, filled with insulating rock wool and a vacuum insulation board, is inserted into the inner layer of the steel pipe, causing the expansion alloy ring to expand upon heating, compressing the sealing gasket to firmly adhere to the pipe joint, effectively preventing leakage of the medium inside the direct-buried insulated pipe from the joint and ensuring the insulation connection of the direct-buried insulated pipe. Furthermore, by injecting sealant into the screw connection between the outer pipe fitting and the inner layer of the steel pipe, the sealant flows and solidifies into the screw joint gap, further enhancing the sealing performance of the quick connection device for direct-buried insulated pipes, effectively isolating the inside and outside of the pipe, and ensuring quick and secure installation of the direct-buried insulated pipe connection device. Attached Figure Description

[0012] Figure 1 This is a front view structural diagram of the quick connection device for direct-buried insulated pipes according to an embodiment of the present utility model.

[0013] Figure 2 This is a front view cross-sectional schematic diagram of the connection structure of the quick connection device for direct-buried insulated pipes according to an embodiment of this utility model.

[0014] Figure 3 This is a side view cross-sectional structural diagram of the outer tube connector according to an embodiment of the present utility model.

[0015] Figure 4 This is a cross-sectional structural diagram of the inner tube connector according to an embodiment of the present utility model.

[0016] In the diagram: 1. Direct-buried insulated pipe body; 11. Inner layer of steel pipe; 12. Outer layer of insulation; 2. Outer pipe fitting; 21. Elastic pad; 22. Injection groove; 23. Injection hole; 24. Outlet hole; 3. Pipe clamp; 31. Fastening bolt; 4. Nano aerogel felt; 5. Inner pipe fitting; 51. Insulation rock wool layer; 52. Vacuum insulation board; 53. First sealing gasket; 54. Second sealing gasket; 55. Expansion alloy ring. Detailed Implementation

[0017] Please refer to Figures 1 to 4 As shown, this utility model provides a quick connection device for direct-buried insulated pipes, including: a direct-buried insulated pipe body 1, and a steel pipe inner layer 11 disposed inside the direct-buried insulated pipe body 1. The direct-buried insulated pipe body 1 is connected to an outer pipe fitting 2. The outer end face of the outer pipe fitting 2 is fixed with a pipe clamp 3 by a fastening bolt 31. An injection groove 22 is opened inside the outer pipe fitting 2. An inner pipe fitting 5 is welded to the inner side of the outer pipe fitting 2. The inner side of the inner pipe fitting 5 is filled with an insulation rock wool layer 51 and a vacuum insulation board 52. The inner pipe fitting 5 is tightly attached to the inner wall and side wall of the inner layer 11 of the steel pipe through a first sealing gasket 53 and a second sealing gasket 54. An expansion alloy ring 55 is provided between the inner pipe fitting 5 and the first sealing gasket 53.

[0018] First, screw the integrated outer pipe connector 2 into the right end of one set of direct-buried insulated pipe bodies 1. Then, screw the left end of the other set of direct-buried insulated pipe bodies 1 into the right end of the outer pipe connector 2. After both ends are screwed in, the inner pipe connector 5 is inserted into the inner layer 11 of the steel pipe of the two sets of direct-buried insulated pipe bodies 1. At this time, sealant is injected into the glue injection groove 22, so that the glue flows along the glue injection groove 22 and the glue outlet 24 to the bolt joint. After curing, the nano aerogel felt 4 is wrapped around the pipe surface of the outer pipe connector 2 and tightened with pipe clamps 3 to complete the quick connection of the direct-buried insulated pipe body 1.

[0019] In this embodiment, the direct-buried insulated pipe body 1 is provided with an inner steel pipe layer 11 and an outer insulation layer 12 from the inside out. The outer surface of the inner steel pipe layer 11 is screwed to the inner thread of the outer pipe connector 2 via an external thread. The left and right ends of the outer pipe connector 2 are attached to the direct-buried insulated pipe body 1 via elastic pads 21, and the left and right ends of the outer pipe connector 2 are inserted and sleeved with the outer insulation layer 12. A nano-aerogel felt 4 surrounds the groove on the outer ring surface of the outer pipe connector 2, and pipe clamps 3 are fixed at both ends of the nano-aerogel felt 4. An arc-shaped glue injection groove 22 is opened inside the outer pipe connector 2, and a glue injection hole 23 is opened on the outer end of the groove wall; and the surface of the glue injection hole 23 is covered with nano-aerogel felt 4. A glue outlet hole 24 is opened on the inner end of the groove wall; and the glue outlet hole 24 is located at the inner thread end of the outer pipe connector 2.

[0020] In a preferred embodiment, the inner pipe fitting 5 is directly inserted and pressed into the inner layer 11 of the steel pipe to form the first sealing barrier, preventing leakage of the medium inside the direct-buried insulated pipe body 1. The screw-connected outer pipe fitting 2 facilitates quick and easy installation and connection with the direct-buried insulated pipe body 1. The nano-aerogel felt 4 serves as thermal insulation, further reducing heat loss of the medium inside the direct-buried insulated pipe body 1 and preventing cold bridging. Sealant is injected into the injection groove 22 through the injection hole 23, allowing the sealant to flow into the screw joint between the outer pipe fitting 2 and the direct-buried insulated pipe body 1 through the outlet hole 24 on the inner wall of the injection groove 22, where it cures to form the second sealing barrier, further preventing leakage of the medium inside the direct-buried insulated pipe body 1 and improving the insulation and sealing performance of the quick-connect device for direct-buried insulated pipes.

[0021] In this embodiment, expansion alloy rings 55 are welded to the outer pipe surfaces at the left and right ends of the inner pipe connector 5, and a first sealing gasket 53 is bonded to the surface of the expansion alloy rings 55.

[0022] As a preferred embodiment, the expansion alloy ring 55 is inserted into the inner layer 11 of the steel pipe. When the temperature of the heated medium changes, it expands and pushes the first sealing gasket 53 outward, making the first sealing gasket 53 fit more tightly against the inner wall of the steel pipe 11. This effectively prevents the medium inside the direct-buried insulated pipe from leaking out of the joint and ensures the insulation connection of the direct-buried insulated pipe.

[0023] This utility model's quick-connect device for direct-buried insulated pipes effectively solves the problem in existing technologies where the connection between two sets of direct-buried insulated pipes leads to discontinuous insulation and accidental occurrences that affect the insulation performance of the direct-buried insulated pipes. It effectively prevents the medium inside the direct-buried insulated pipe from leaking out of the joint, ensuring the insulation connection at the connection point of the direct-buried insulated pipe. Furthermore, it enhances the sealing performance of the quick-connect device for direct-buried insulated pipes, effectively blocking the inside and outside of the pipe, ensuring that the connection device for direct-buried insulated pipes is quick and secure to install. It is suitable for quick-connect devices for direct-buried insulated pipes.

Claims

1. A quick connection device for direct-buried insulated pipes, comprising: The direct-buried insulated pipe body (1) has a steel pipe inner layer (11) inside, characterized in that: The direct-buried insulated pipe body (1) is connected to an outer pipe fitting (2). The outer end face of the outer pipe fitting (2) is fixed with a pipe clamp (3) by a fastening bolt (31). The outer pipe fitting (2) has an injection groove (22) inside. An inner pipe fitting (5) is welded to the inner side of the outer pipe fitting (2). The inner side of the inner pipe fitting (5) is filled with an insulation rock wool layer (51) and a vacuum insulation board (52). The inner pipe fitting (5) is tightly attached to the inner wall and side wall of the inner layer (11) of the steel pipe through a first sealing gasket (53) and a second sealing gasket (54). An expansion alloy ring (55) is provided between the inner pipe fitting (5) and the first sealing gasket (53).

2. The quick connection device for direct-buried insulated pipes according to claim 1, characterized in that, The direct-buried insulated pipe body (1) is provided with a steel pipe inner layer (11) and an insulation outer layer (12) from the inside to the outside. The outer pipe surface of the steel pipe inner layer (11) is screwed to the inner thread of the outer pipe fitting (2) through the external thread.

3. The quick connection device for direct-buried insulated pipes according to claim 1, characterized in that, The left and right ends of the outer pipe connector (2) are attached to the direct-buried insulation pipe body (1) through elastic pads (21), and the left and right ends of the outer pipe connector (2) are inserted into the insulation outer layer (12) and sleeved.

4. The quick connection device for direct-buried insulated pipes according to claim 1, characterized in that, The outer pipe fitting (2) has a nano-aerogel felt (4) surrounding the groove on its outer ring surface, and pipe clamps (3) are fixed at both ends of the nano-aerogel felt (4).

5. The quick connection device for direct-buried insulated pipes according to claim 1, characterized in that, The outer tube connector (2) has an arc-shaped glue injection groove (22) inside, and the outer end wall of the glue injection groove (22) has a glue injection hole (23); and the surface of the glue injection hole (23) is covered with a nano aerogel felt (4).

6. The quick connection device for direct-buried insulated pipes according to claim 5, characterized in that, The inner end wall of the glue injection groove (22) is provided with glue outlet holes (24); and the glue outlet holes (24) are located at the inner thread end of the outer tube connector (2).

7. The quick connection device for direct-buried insulated pipes according to claim 1, characterized in that, The inner tube connector (5) has an expansion alloy ring (55) welded to the outer tube surface at the left and right ends, and a first sealing gasket (53) is bonded to the ring surface of the expansion alloy ring (55).

Images