Heat exchange U head for ground source heat pump system

Abstract

The utility model discloses a heat exchange U head for a ground source heat pump system. An outer shell of the U head is integrally designed to be flat, the outer layer of the U head is coated with a layer of metal protective shell, the metal protective shell is connected with the outer shell of the U head in a bonding mode, a pipe connector is connected in an integrated electric smelting mode, the connector is more reliable, a cross-shaped groove is formed in the plane of the U head, and a lower pipe drill rod head can be locked. And the drill rod is prevented from sliding down and shoveling the root of the pipe to cause quality accidents. The utility model solves the problems that the bottom of the U head of the vertical buried pipe and the root of the pipe are easy to rub with the hole wall, the side of the U head is abraded and the root of the pipe is directly fractured in the rapid pipe descending process of the heat exchange U head for the existing ground source heat pump system, is convenient to construct and reliable in quality, and ensures the service life of the ground source heat pump air-conditioning system.

Description

Technical Field

[0001] The utility model relates to the technical field of pipes, in particular to a heat exchange U-head for a ground source heat pump system. Background Art

[0002] Geothermal heat pump systems utilize shallow geothermal energy for energy transfer, achieving 30% to 50% higher energy efficiency than traditional air conditioning systems, significantly reducing energy consumption. Geothermal heat pump systems offer advantages such as high efficiency and energy conservation, environmental friendliness, stable operation, low maintenance costs, multi-purpose functionality, and a long service life, making them a preferred solution for green buildings and sustainable development.

[0003] At present, the underground pipe method of ground source heat pump air conditioning system generally adopts the vertical buried pipe method, mainly because the vertical buried pipe occupies a small area and has high heat exchange efficiency. In terms of construction, the pipe can also be buried under buildings, in green squares and other scenes without affecting the use function of the building.

[0004] The construction of vertical buried pipes for ground-source heat pumps generally involves site surveys, hole excavation, pipe installation, fixed packaging, and system connections. During installation, high-density polyethylene heat exchange pipes are installed vertically into deep holes approximately 150 meters deep. The heat exchange pipes are connected via U-shaped connectors to circulate the heat exchange medium. Currently, the mainstream heat exchange U-shaped connectors in the market are round or standard. Due to the complex geological structure of the pipe installation area, the bottom of the U-shaped connector and the root of the pipe are prone to friction with the hole wall during rapid installation, causing wear on the sides of the U-shaped connector, which can reduce the pipe's pressure coefficient. In severe cases, the root of the pipe can even break, causing installation failure. Furthermore, even if the hydrostatic test passes without problems, water seepage and leakage may occur at the damaged U-shaped connector and pipe root after a period of operation. By then, the wellhead has been fixed and sealed, making repair difficult. This results in a useless or damaged well and ineffective ground-source heat pump air conditioning system.

[0005] In summary, it's clear that the heat exchanger U-head in a ground-source heat pump system has become the "heart" of the vertical buried pipe system. Its quality directly impacts the service life of the entire ground-source heat pump air conditioning system. Designing a heat exchanger U-head for ground-source heat pump systems that is easy to install, reliable, and low-cost is a major technical challenge facing the industry. Summary of the Invention

[0006] In order to solve the problem that the bottom of the U-head and the root of the vertical buried pipe are easily rubbed against the hole wall during the rapid lowering process of the existing ground source heat pump system, resulting in side wear of the U-head and direct breakage of the pipe root, the utility model proposes a heat exchange U-head for the ground source heat pump system.

[0007] The technical solution of the present utility model is a heat exchange U-head for a ground source heat pump system, comprising a U-head outer shell, the outer shell of the U-head is covered with a metal protective shell to prevent the surface of the U-head from being worn during the pipe lowering process; a cross groove is provided on the plane of the U-head, which can lock the drill rod head of the lowered pipe, making the pipe lowering smoother and preventing the drill rod from slipping and damaging the pipe root; integrated electric fusion interfaces are provided on both sides of the cross groove to facilitate the welding of the pipe interface and make the weld more reliable.

[0008] Furthermore, the U-head outer shell is designed to be flat as a whole, which can reduce the resistance of the downtube.

[0009] Furthermore, the metal protective shell is connected to the U-head outer shell through bonding or mechanical connection, which can prevent the U-head from falling off during the tube lowering process.

[0010] The beneficial effects achieved by the utility model are:

[0011] This utility model proposes a heat exchange U-head for ground-source heat pump systems. The overall outer profile is flattened, with a metal protective shell coated on the outside. The metal protective shell is bonded to the U-head's plastic layer. The pipe joints utilize integrated electric fusion for a more reliable connection. The U-head's flat surface features a cross-shaped groove that locks the drill rod head for smoother placement and prevents the drill rod from slipping and damaging the pipe root. This solves the problem of existing heat exchange U-heads for ground-source heat pump systems, which can easily cause friction between the bottom of the U-head and the pipe root during rapid placement of vertical buried pipes, leading to wear on the U-head sides and even direct breakage at the pipe root. This design facilitates construction, provides reliable quality, and ensures the longevity of the ground-source heat pump air conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of the present utility model;

[0013] Explanation of the reference numerals: outer shell - 1; metal protective shell - 2; cross groove - 3; electric fusion interface - 4. DETAILED DESCRIPTION

[0014] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose, the following is a detailed description of the specific implementation method, structure, characteristics and effects of the present invention in combination with the accompanying drawings and preferred embodiments.

[0015] 1. Preparation before lowering the pipe

[0016] First, before laying the pipes, they must be carefully inspected to ensure they are free of scratches and damage and meet design requirements. Key information, such as the specific drilling locations and the direction of the horizontal trenches, must be marked with white lime based on the underground pipe construction drawings.

[0017] Secondly, confirm the water, power and other conditions on site to ensure normal use during construction.

[0018] Finally, before laying the pipe, it is necessary to ensure that the drilling work has been completed, and that the depth, diameter and other parameters of the drilling meet the design requirements, and clean the drilling hole to ensure that there is no debris and water in the hole.

[0019] 2. Tube lowering process

[0020] Use a dedicated electric melting device to connect the pipe port to the electric melting interface 4 on the U-head by electric melting, ensuring that the connection is firm and leak-free. Then start the pipe lowering operation, clamp the cross pressure head of the drill pipe head into the cross groove 3 on the U-head, and at the same time, point the U-head outer shell 1 directly downward. At the same time, make sure that the metal protective shell 2 on the U-head is coaxial with the borehole to avoid excessive bending that may cause damage to the pipe. During the pipe lowering process, the metal protective shell 2 on the U-head will rub against the well wall, thereby protecting the pipeline. After the pipe is placed in the borehole, it is necessary to fill the pipe with water and add a pressure gauge to the pipe mouth. The pipe needs to be lowered under pressure. During the pipe lowering process, care should also be taken to avoid letting go suddenly to prevent the pipe from floating or being damaged.

[0021] 3. Follow-up work after the pipeline is laid

[0022] After the pipes are laid, grouting is required. After grouting and fixing are complete, the entire buried pipe system needs to be pressure tested and debugged to ensure there are no leaks in the system and that it meets design requirements.

[0023] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A heat exchange U-head for a ground source heat pump system, characterized by: The invention comprises a U-head outer shell (1), wherein a metal protective shell (2) is coated on the outer surface of the U-head outer shell (1) to prevent the surface of the U-head from being worn during the pipe lowering process; a cross groove (3) is provided on the plane of the U-head to lock the drill rod head of the pipe lowering, making the pipe lowering smoother and preventing the drill rod from slipping and damaging the pipe root; integrated electric fusion interfaces (4) are respectively provided on both sides of the cross groove (3), which facilitates the pipe interface welding and makes the weld more reliable.

2. A heat exchange U-head for a ground source heat pump system according to claim 1, characterized in that: The U-head outer shell (1) is designed to be flat as a whole, which can reduce the resistance of the lower tube.

3. The heat exchange U-head for a ground source heat pump system according to claim 2, characterized in that: The metal protective shell (2) is connected to the U-head outer shell (1) by bonding or mechanical connection, thereby preventing the U-head from falling off during the tube lowering process.

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