Quick positioning device for pre-extension of central thermal insulation pipe of middle-deep geothermal well

Abstract

The utility model discloses a quick positioning device for pre-extension of a central thermal insulation pipe of a middle-deep geothermal well, one end of the central thermal insulation pipe is positioned through a driving ring, the other end of the central thermal insulation pipe is positioned through a fixed ring and a driven ring, the driving ring is of a double-step type cylinder structure with a convex vertical section along the axis, the protruding length can be adjusted, and an outer pipe is fixed on the outer circumference of the driving ring. The protruding length of the protruding part of the driving ring is adjusted according to the preset length, and the inner pipe is pushed to enter the pipe end of the outer pipe by a preset distance. The fixed ring is of a cylindrical structure with a concave vertical section along the axis, the proximity switch is arranged at the concave position of the fixed ring, the driven ring is of a cylindrical annular structure with the adjustable axial height, the driven ring is arranged in the outer pipe, the outer pipe is sleeved with the fixed ring, a concave step makes contact with the end face of the outer pipe, one side of the driven ring makes contact with the inner pipe, and the other side of the driven ring makes contact with the outer pipe. When the pre-stretching length of the inner pipe reaches the preset length, the passive ring triggers the proximity switch to disconnect the heating stretching device. The problems that existing manual measurement is affected by various factors, errors are large, and measurement efficiency is low are solved.

Description

Technical Field

[0001] This utility model belongs to the field of central insulation pipes, specifically relating to a rapid positioning device for pre-elongation of central insulation pipes in medium-deep geothermal wells. Background Technology

[0002] During the production of central insulation pipes, it is necessary to determine the relative lengths of the inner and outer pipes and establish a pre-extension length. The main reasons for this are as follows: First, central insulation pipes are subject to thermal expansion and contraction due to temperature changes during use. The pre-extension length compensates for this thermal expansion, reducing stress caused by thermal expansion and contraction, preventing pipe deformation, cracking, or damage, thus ensuring the normal operation and service life of the pipeline system. Second, it ensures the sealing of pipe connections. The pre-extension length allows the inner and outer pipes to fit tightly after installation, preventing media leakage and ensuring the heating efficiency and safety of the geothermal system. Third, it helps improve the stability and reliability of the entire central insulation pipe system, avoiding problems such as pipe displacement and vibration caused by changes in pipe length, and reducing maintenance costs.

[0003] Currently, the method for achieving the pre-elongation length is usually to adjust and fix the relative positions of the inner and outer pipes manually during the geothermal insulation pipe production process, according to design requirements and relevant standards. However, existing mechanical measuring tools, such as vernier calipers and tape measures, are greatly affected by human factors in terms of measurement accuracy, which may lead to reading errors and thus inaccurate pre-elongation measurements. Furthermore, their measurement efficiency is low; in large-scale production, measuring the relative lengths of both ends of the inner and outer pipes one by one to determine the pre-elongation length would consume a significant amount of time and impact production schedules. Utility Model Content

[0004] To overcome the shortcomings of the prior art, the purpose of this utility model is to provide a rapid positioning device for the pre-elongation of the central insulation pipe of a medium-deep geothermal well. This device solves the problems of large errors caused by various factors in existing mechanical measuring tools, the need for multiple measurements of the elongation of the inner pipe, the cumbersome process, and the low measurement efficiency.

[0005] This utility model is achieved through the following technical solution:

[0006] A rapid positioning device for pre-extension of the central insulation pipe of a medium-deep geothermal well includes an active ring, a fixed ring, and a passive ring. One end of the central insulation pipe is positioned by the active ring, and the other end is positioned by the fixed ring and the passive ring. The active ring is a double-stage cylindrical structure with a convex shape in the vertical section along the axis, and the protrusion length is adjustable. The outer circumference of the active ring fixes the outer pipe of the central insulation pipe. The protrusion length of the active ring is adjusted according to a preset length to push the inner pipe of the central insulation pipe into the outer pipe end by a predetermined distance.

[0007] The fixed ring is a cylindrical structure with a concave vertical cross-section along the axis. A proximity switch is installed in the concave part of the fixed ring. The passive ring is a cylindrical annular structure with adjustable axial height. The passive ring is installed inside the outer tube of the central insulation tube. The fixed ring is sleeved on the outside of the outer tube at the same end, and the concave step contacts the end face of the outer tube. One end of the passive ring contacts the inner tube. When the pre-elongation length of the inner tube reaches the preset length, the other end of the passive ring triggers the proximity switch. The proximity switch generates a signal, which is used to disconnect the heating and elongation device of the inner tube.

[0008] Furthermore, the active ring has a central protrusion with first screw holes on its upper and lower sides, and the active ring washer is fixed to the central protrusion of the active ring by first bolts through the first screw holes.

[0009] Furthermore, second screw holes are respectively opened on the upper and lower sides of the same side of the passive ring, and the passive ring washer is fixed to the passive ring by the second screw holes through the second bolts.

[0010] Furthermore, the initial thickness of the protruding portion of the active ring is 5 mm.

[0011] Furthermore, the initial thickness of the passive ring is 5 mm.

[0012] Furthermore, the active pads have thicknesses of 1, 2, and 5 mm, respectively.

[0013] Furthermore, the passive ring gaskets have thicknesses of 1, 2, and 5 mm, respectively.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention uses an active ring to push the inner tube to a set position to complete the initial positioning. Through the cooperation of the passive ring and the fixed ring, when the pre-added elongation length reaches the set requirement, the proximity switch will generate a warning prompt and automatically disconnect the heating elongation device. This invention automatically controls the elongation amount by preset elongation length, applies stress accurately and uniformly, avoids the influence of human factors, has small errors, and high measurement efficiency.

[0016] This utility model device has a simple structure, is easy to operate and maintain, and can adapt to different specifications of central insulation pipes by matching different active gaskets and passive ring gaskets with different thicknesses, thus improving the versatility and flexibility of the equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram illustrating the positioning process using this invention.

[0018] Figure 2 This is a schematic diagram of the active ring structure of this utility model.

[0019] Figure 3This is a schematic diagram of the passive ring structure of this utility model.

[0020] Figure 4 This is a schematic diagram of the structure of the fixing ring of this utility model.

[0021] In the diagram, 1-active ring; 2-first screw hole; 3-first bolt; 4-active ring washer; 5-fixed ring; 6-proximity switch; 7-passive ring; 8-second screw hole; 9-second bolt; 10-passive ring washer; 11-inner tube; 12-outer tube. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to specific embodiments. The description is for explanation and not limitation of the present invention.

[0023] A rapid positioning device for pre-elongation of the central insulation pipe of a medium-deep geothermal well includes an active ring 1, a fixed ring 5, and a passive ring 7. One end of the central insulation pipe is positioned by the active ring 1 and then welded in a ring. The relative positions of the inner and outer pipes at this end are fixed, and the inner pipe is extended by heating. The other end is positioned by the fixed ring 5 and the passive ring 7.

[0024] The active ring 1 pushes the inner tube of the central insulation tube to a preset position according to the pre-set length, completing one-end positioning. The passive ring 7, in conjunction with the fixed ring 5, triggers the proximity switch 6 in the fixed ring 5 when the inner tube of the central insulation tube is heated and elongated to the preset length, thereby automatically stopping the operation of the heating and elongation device. This design not only ensures precise control of the elongation amount but also greatly improves work efficiency and reduces errors caused by human operation. Furthermore, the device's reasonable structural design and tight fit between components make the entire device more stable and reliable during use.

[0025] The active ring 1 is a double-stage cylindrical structure with a convex shape in its vertical cross-section along the axis, and the protrusion length is adjustable. The middle protrusion of the active ring 1 has first screw holes 2 on the upper and lower sides respectively. The first screw holes 2 are used to fix the active ring gasket 4 to the middle protrusion of the active ring 1 by first bolts 3. The initial thickness of the protrusion of the active ring 1 is 5mm, and the active gasket 4 has thicknesses of 1, 2, and 5mm respectively. The outer circumference of the active ring 1 fixes the outer tube 12 of the central insulation pipe. The protrusion length of the active ring 1 is adjusted according to a preset length to fix the inner tube 11 of the central insulation pipe.

[0026] By adjusting the thickness of the active ring gasket 4, the protrusion length of the active ring 1 can be precisely adjusted to meet the pre-elongation requirements of central insulation pipes of different lengths. This design not only improves the applicability of the device but also makes operation more flexible and convenient. At the same time, the outer tube 12 of the central insulation pipe is fixed at the upper and lower openings of the active ring 1, ensuring the stability of the central insulation pipe during the elongation process and avoiding errors caused by shaking or displacement.

[0027] The fixing ring 5 is a cylindrical structure with a concave vertical cross-section along the axis. A proximity switch 6 is installed in the concave part of the fixing ring 5. The passive ring 7 is a cylindrical annular structure with adjustable axial height. Second screw holes 8 are opened on the same side of the passive ring 7, and the passive ring gasket 10 is fixed to the passive ring 7 by second bolts 9. The initial thickness of the passive ring 7 is 5mm, and the passive ring gasket 10 has thicknesses of 1, 2, and 5mm. The passive ring 7 is placed inside the outer tube 12 of the central insulation pipe, and the fixing ring 5 is sleeved on the outer side of the same end of the outer tube 12, with the concave step contacting the end face of the outer tube 12. One end of the passive ring 7 contacts the inner tube 11. When the pre-elongation length of the inner tube 11 reaches the preset length, the other side of the passive ring 7 contacts the proximity switch 6, and the proximity switch 6 generates a warning signal. The warning signal is used to disconnect the heating extension device of the inner tube 11.

[0028] By adjusting the thickness of the passive ring gasket 10, the required preset length of the inner tube 11 can be precisely adjusted, thus improving the applicability of the device.

[0029] The proximity switch 6 is selected as a fast-response, sensitive, and dustproof switch to adapt to harsh environments under different working conditions. When the passive ring 7 contacts the proximity switch 6, the proximity switch 6 can respond quickly and issue a warning signal to ensure that the heating and elongation of the inner tube 11 stops in time after the pre-elongation length reaches the preset value, thus avoiding safety hazards caused by excessive elongation.

[0030] In summary, this invention enables rapid positioning of the pre-elongated central insulation pipe in medium-deep geothermal wells, and has advantages such as simple structure, convenient operation, and safety and reliability.

Claims

1. A rapid positioning device for pre-elongation of the central insulation pipe in a medium-deep geothermal well, characterized in that, It includes an active ring (1), a fixed ring (5) and a passive ring (7). One end of the central insulation pipe is positioned by the active ring (1), and the other end is positioned by the fixed ring (5) and the passive ring (7). The active ring (1) is a double-stage cylindrical structure with a convex shape in the vertical section along the axis, and the protrusion length can be adjusted. The outer circumference of the active ring (1) fixes the outer tube (12) of the central insulation pipe. The protrusion of the active ring (1) is adjusted according to the preset length to push the inner tube (11) of the central insulation pipe into the pipe end of the outer tube (12) a predetermined distance. The fixed ring (5) is a cylindrical structure with a concave vertical section along the axis. A proximity switch (6) is provided in the concave part of the fixed ring (5). The passive ring (7) is a cylindrical ring structure with adjustable axial height. The passive ring (7) is located inside the outer tube (12) of the central insulation tube. The fixed ring (5) is sleeved on the outer side of the same end of the outer tube (12), and the concave step contacts the end face of the outer tube (12). One end of the passive ring (7) contacts the inner tube (11). When the pre-elongation length of the inner tube (11) reaches the preset length, the other end of the passive ring (7) triggers the proximity switch (6). The proximity switch (6) generates a signal, which is used to disconnect the heating extension device of the inner tube (11).

2. The rapid positioning device for pre-elongation of the central insulation pipe of a medium-deep geothermal well according to claim 1, characterized in that, The active ring (1) has a protruding middle portion and first screw holes (2) on the upper and lower sides respectively. The active ring gasket (4) is fixed to the protruding middle portion of the active ring (1) by first bolts (3) through the first screw holes (2).

3. The rapid positioning device for pre-elongation of the central insulation pipe of a medium-deep geothermal well according to claim 1, characterized in that, The passive ring (7) has second screw holes (8) on the same side, one above the other, and the passive ring washer (10) is fixed to the passive ring (7) by the second bolt (9) through the second screw holes.

4. The rapid positioning device for pre-elongation of the central insulation pipe of a medium-deep geothermal well according to claim 1, characterized in that, The initial thickness of the protruding portion of the active ring (1) is 5 mm.

5. The rapid positioning device for pre-elongation of the central insulation pipe of a medium-deep geothermal well according to claim 1, characterized in that, The initial thickness of the passive ring (7) is 5 mm.

6. The rapid positioning device for pre-elongation of the central insulation pipe of a medium-deep geothermal well according to claim 4, characterized in that, The active ring gaskets (4) have thicknesses of 1, 2, and 5 mm, respectively.

7. The rapid positioning device for pre-elongation of the central insulation pipe of a medium-deep geothermal well according to claim 5, characterized in that, The passive ring gaskets (10) have thicknesses of 1, 2, and 5 mm, respectively.

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