CN-224214976-U - Ultra-large caliber central heat preservation pipe for middle-deep geothermal well

CN224214976UCN 224214976 UCN224214976 UCN 224214976UCN-224214976-U

Abstract

The utility model discloses an ultra-large caliber central heat preservation pipe for a middle-deep geothermal well, which comprises an outer pipe and an inner pipe which are sleeved concentrically, wherein two ends of the inner pipe are flared and welded on the inner wall of the outer pipe, a sealed cavity is formed between the inner pipe wall and the outer pipe wall, a vacuum state is kept, the outer wall of the inner pipe is coated or spirally wound with a strip-shaped cloth bag structure along the axis direction to form a heat preservation layer, the strip-shaped cloth bag structure is formed by alternately arranging and packaging one or more groups of reflecting layers and heat insulation layers in the heat preservation sleeve, and a plurality of annular centralizing reinforcing ribs are sleeved outside the heat preservation layer at intervals. The multilayer reflection of the heat preservation layer in the heat preservation pipe can effectively prevent heat loss, and the heat preservation effect is improved. Meanwhile, the strip cloth bag structure can prevent aerogel powder from escaping, and the health risk of inhalable particles is reduced. In addition, the plurality of centralizing reinforcing ribs are arranged on the outer side of the heat preservation layer to ensure that gaps between the inner tube and the outer tube are uniformly distributed, the sealing performance of the annular inner space of the inner tube and the outer tube can be effectively maintained, and the heat conduction path is cut off, so that the heat insulation effect is ensured.

Inventors

XU FANGJUN
CHEN QIANLONG
MA ZHI
XIONG XIN

Assignees

西安润威恒泰地热管技术有限公司

Dates

Publication Date: 20260508
Application Date: 20250625

Claims (5)

1. A central heat-insulating pipe with ultra-large caliber for a middle-deep geothermal well is characterized by comprising an outer pipe (1) and an inner pipe (2) which are concentrically sleeved, wherein two ends of the inner pipe (2) are flared and welded on the inner wall of the outer pipe (1), a sealed cavity is formed between the inner pipe wall and the outer pipe wall and kept in a vacuum state, the outer wall of the inner pipe (2) is coated or spirally wound with a strip-shaped cloth bag structure along the axis direction to form a heat-insulating layer (3), the strip-shaped cloth bag structure is formed by alternately arranging one or more groups of reflecting layers (32) and heat-insulating layers (31), alkali-free cloth materials are arranged on the upper surface and the lower surface, the peripheries of the strip-shaped cloth bag structure are sewn together and packaged in the heat-insulating sleeve, and a plurality of annular centralizing reinforcing ribs (4) are arranged on the outer spacer of the heat-insulating layer (3).
2. The ultra-large caliber central heat preservation pipe for the middle and deep geothermal wells is characterized in that round platform holes (5) are respectively formed in two ends of the outer pipe (1), the round platform holes (5) are communicated with sealed cavities of the inner pipe and the outer pipe, plugs (6) matched with the round platform holes in specification are arranged in the round platform holes (5), the plugs (6) are connected to electrode rods (8) for vacuumizing, the electrode rods (8) are fixed with the outer wall of the outer pipe (1) in a sealing mode through sealing gaskets (7), the inner portion of each electrode rod (8) is hollow, the upper end of each electrode rod is connected with a vacuum suction nozzle (9), a vacuum pump is connected to the sealed cavity between the inner pipe and the outer pipe, vacuumizing treatment is conducted on the sealed cavity between the inner pipe and the outer pipe, and after a preset vacuum degree is achieved, the sealing cavity between the inner pipe and the outer pipe is kept in a vacuum state by connecting the electrode rods (8) to heat and melt the plugs (6).
3. The ultra-large caliber central heat preservation pipe for the middle-deep geothermal well, which is disclosed in claim 2, is characterized in that a vertical through hole is drilled at the center of the top of the plug (6), and a transverse through hole communicated with the vertical hole is formed at the middle downward position of the height of the plug (6), so that a communicated vacuumizing channel is formed.
4. The ultra-large caliber central insulation pipe for the middle-deep geothermal well according to claim 1, wherein the material of the reflecting layer is one of aluminum foil, stainless steel foil, vacuum aluminized paper, aluminized polyester film (MPET) or metallized polypropylene film.
5. The ultra-large caliber central heat preservation pipe for the middle-deep geothermal well, which is disclosed in claim 1, is characterized in that the heat insulation layer is made of one of aerogel felt, phenolic foam, glass fiber cloth or polyurethane foam.

Description

Ultra-large caliber central heat preservation pipe for middle-deep geothermal well Technical Field The utility model belongs to the technical field of manufacturing of heat insulation pipes, and particularly relates to an ultra-large caliber central heat insulation pipe for a middle-deep geothermal well. Background The traditional heat preservation pipe is difficult to effectively block the transmission path of heat energy due to the small number of reflecting layers, so that the heat preservation effect is limited, and the pipe body is easy to bend. Meanwhile, the production process is complex, the preparation period is long, the efficiency is low, and the large-scale production is not facilitated. In addition, some insulation materials, such as aerogels, may generate powder during use, and these fine particles may be easily dispersed, which may not only affect the performance of the insulation material itself, but may also pose a potential risk to the environment and human health, especially long-term exposure to the environment containing aerogel dust, may cause respiratory tract discomfort or other health problems. Disclosure of utility model The utility model aims to provide an ultra-large caliber central heat preservation pipe for a middle-deep geothermal well, which can effectively prevent heat loss, prevent aerogel powder from escaping and reduce health risks of inhalable particles. In order to achieve the above purpose, the present utility model provides the following technical solutions: The ultra-large caliber central heat preservation pipe for the middle-deep geothermal well comprises an outer pipe and an inner pipe which are sleeved concentrically, wherein two ends of the inner pipe are flared and welded on the inner wall of the outer pipe, a sealed cavity is formed between the inner pipe wall and the outer pipe wall, a vacuum state is kept, the outer wall of the inner pipe is coated or spirally wound with a strip-shaped cloth bag structure along the axis direction of the inner pipe to form a heat preservation layer, the strip-shaped cloth bag structure is formed by alternately arranging and packaging a plurality of layers of reflecting layers and heat insulation layers in sequence in the heat preservation sleeve, and a plurality of annular centralizing reinforcing ribs are sleeved outside the heat preservation layer at intervals. Furthermore, round table holes are respectively formed at two ends of the outer tube, the round table holes are communicated with sealed cavities of the inner tube and the outer tube, plugs matched with the same specification are arranged in the round table holes, the plugs are connected to electrode rods for vacuumizing, the electrode rods are sealed and fixed with the outer wall of the outer tube through sealing flat gaskets, the inside of each electrode rod is hollow, the upper ends of the electrode rods are connected with vacuum suction nozzles, the vacuum suction nozzles are connected with vacuum pumps, the sealed cavities between the inner tube and the outer tube are vacuumized, and after the preset vacuum degree is achieved, the electrode rods are connected to heat and melt the plugs to seal the round table holes, so that the sealed cavities between the inner tube and the outer tube are kept in a vacuum state. Further, a vertical through hole is drilled in the center of the top of the plug, and a transverse through hole communicated with the vertical hole is formed in the middle part of the height of the plug in a downward position, so that a communicated vacuumizing channel is formed. Further, the material of the reflecting layer is one of aluminum foil, stainless steel foil, vacuum aluminized paper, aluminized polyester film (MPET) or metallized polypropylene film. Further, the heat insulation layer is made of one of aerogel felt, phenolic foam, glass fiber cloth or polyurethane foam. Compared with the prior art, the utility model has the following beneficial effects: According to the utility model, the strip cloth bag structure is manufactured by packaging the multilayer reflecting layer and the heat insulating layer in the heat insulating sleeve, so that the aerogel can be effectively prevented from scattering, and the health risk of inhalable particles is reduced. The strip-shaped cloth bag structure is wound on the surface of the inner pipe to form an insulation layer, and then the outer pipe is sleeved on the strip-shaped cloth bag structure to form a stable and reliable multilayer insulation structure, so that multilayer reflection can effectively prevent heat loss, and the insulation effect is improved. On the one hand, the heat-insulating pipe can still maintain good structural strength and stability under the ultra-large caliber scene, reduce relative deflection, precisely control the distance between the inner pipe and the outer pipe wall, ensure circumferential and axial uniformity, further ensure uniform gap distribution between the inner pipe and