A primary forming drill for a ground source heat pump heat exchange well and its working method

Abstract

The present invention provides a primary forming drill for a ground source heat pump heat exchange well. A one-way water valve is provided at the upper end of the housing. Wing plates are arranged at intervals on the outer periphery of the housing. A motor is provided in the inner cavity of the housing, and the power cord of the motor extends out of the housing. A water passing hole plate is fixed at the lower end of the housing cavity, and a spiral drill is inserted into the water passing hole plate and connected to the motor shaft. The spiral drill includes a drill shaft, spiral fins, and a drill bit. The drill bit is located at the top end of the drill shaft, and the spiral fins are wound and fixed around the drill shaft. At the same time, the present invention also provides a working method for the primary forming drill of the ground source heat pump heat exchange well. The present invention enables the primary forming of the ground source heat pump heat exchange well. The equipment provided by the present invention realizes miniaturization, achieving the purpose of being not restricted by the construction site, having simple operation, requiring fewer operators, and not being restricted by working technical experience. The drill has a relatively low cost, can greatly reduce the cost of the heat exchange well, and makes the popularization of the ground source heat pump air conditioner possible.

Description

Technical Field

[0001] The present invention relates to the technical field of installation of ground source heat pump air conditioners, and particularly relates to a one-time forming drill for a ground source heat pump heat exchange well and a working method thereof. Background Art

[0002] In order to solve energy and environmental problems, the development and utilization of new energy are particularly important. As a clean energy, geothermal energy has attracted people's attention due to its extensive reserves and ubiquity; ground source heat pump heating and cooling equipment utilizes shallow geothermal energy, and it has outstanding energy-saving performance both in cooling operation and heating operation, and has been recognized by all sectors of society.

[0003] In the equipment of the ground source heat pump system, a device for heat exchange between the unit and the ground source is required. Initially, people used the method of drilling wells to extract groundwater for heat exchange with the unit, but there are problems such as geological pollution of groundwater, waste of water resources, and difficulty in recharging the return water. Therefore, people explored the method of burying underground closed plastic pipes, called U-shaped tube geothermal wells, and used the medium circulating in the U-shaped tube to exchange heat with the earth soil, achieving heat extraction without water extraction, which has become a more advanced method and has been gradually popularized and still in use today.

[0004] In the construction of burying the U-shaped tube underground, first, a drilling device is used to drill a ground hole at the place where the heat exchange well needs to be formed, then the connected U-shaped closed plastic pipe is buried into the ground hole, and then the backfilling is completed; during the construction process, due to the use of heavy large drilling machinery and equipment, the operation flexibility is poor, and the requirement for the site area is relatively high; therefore, in a narrow area, drilling machinery and equipment cannot be used, nor can the ground source heat pump system be used, which limits the application of the ground source heat pump. Moreover, when using the drilling equipment, there are requirements for the technical proficiency and number of operators. Generally speaking, the cost of the ground source heat pump heat exchange well is relatively high, resulting in a relatively high initial investment in the ground source heat pump air conditioning system, which limits the popularization of the ground source heat pump air conditioner and the development of the industry. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a one-time forming drill for a ground source heat pump heat exchange well, so as to achieve the purpose of reducing the construction cost of the ground source heat pump heat exchange well.

[0006] At the same time, the present invention also provides a working method of the above-mentioned one-time forming drill for a ground source heat pump heat exchange well.

[0007] A primary forming drill for a ground source heat pump heat exchange well, characterized in that a one-way water valve is provided at the upper end of the housing, wing plates are arranged at intervals on the outer periphery of the housing, a motor is arranged in the inner cavity of the housing, and the power cord of the motor extends out of the housing; a water passing hole plate is fixed at the lower end of the housing cavity, and a spiral drill tool extends into the water passing hole plate and is connected to the motor shaft; the spiral drill tool includes a drill tool shaft, spiral fins and a drill bit; the drill bit is located at the top end of the drill tool shaft, and the spiral fins are wound and fixed on the outer periphery of the drill tool shaft.

[0008] Preferably, the housing is in the shape of a bell.

[0009] Preferably, a U-shaped pipe is welded on the housing above the one-way water valve.

[0010] Preferably, a sealing ring is fixed at the connection between the motor shaft and the spiral drill tool.

[0011] Preferably, the motor is a reduction motor.

[0012] Preferably, the outer diameter of the extension of the wing plate is greater than the outer diameter of the spiral fins in the spiral drill tool.

[0013] The working method of the above-mentioned primary forming drill for a ground source heat pump heat exchange well is characterized by including the following steps:

[0014] After the motor is powered on, it drives the spiral drill tool to rotate and break through the soil and move forward, and high-pressure water is injected from the ground end of the U-shaped pipe. The high-pressure water passes through the one-way water valve and the water passing hole plate at the bottom of the housing, impacts on the spiral fins of the drill tool, dissolves the broken soil and sand into mud, and returns to the ground along the gap between the outer wing plates of the housing, taking out the soil, so that the drill tool continues to move downward and pulls the U-shaped heat exchange pipe to the deep underground.

[0015] The beneficial effects of the present invention:

[0016] In the present invention, the outer diameter of the extension of the wing plate is greater than the outer diameter of the spiral fins in the spiral drill tool. First, it enables the returned mud to have a flow channel; second, the edge of the wing plate is inserted into the wall of the well hole. The two jointly overcome the reaction force during the operation of the drill tool, so that the main body does not rotate during operation, ensuring that the U-shaped pipe does not twist and can smoothly descend;

[0017] Utilizing the self-drilling function of this drill, the welded U-shaped pipe is pulled to the underground, enabling the primary forming of the ground source heat pump heat exchange well. The equipment provided by the present invention realizes miniaturization, achieving the purpose of being not restricted by the construction site, having simple operation, requiring few operators, and not being restricted by working technical experience; moreover, the drill is of low cost, can greatly reduce the cost of the heat exchange well, and makes the popularization of the ground source heat pump air conditioner possible;

[0018] Compared with the traditional drilling machinery and the drill of the present invention, in the traditional ground source heat pump heat exchange well, the pipe is inserted after drilling, which requires high requirements for the ground hole: it cannot collapse and in the case of inevitable deviation, the pipe insertion should be smooth, so the requirements for the drilling machinery are relatively high, and a large amount of work needs to be consumed to form a mud wall protection and a large well hole. In the present invention, with the idea of "one-time forming", the excavation is carried out on the soil with a very small double U-tube cross-section, and the problem of wall protection does not need to be considered. Therefore, a large amount of working energy is saved;

[0019] Furthermore, the application scenario of the ground source heat pump air conditioner defines the underground geological conditions. The geological conditions should be suitable for heat exchange soil and sand layers, and the shallow geothermal utilization is only about 100 meters. There is no need to chisel or break rocks. Therefore, the present invention has good effects when applied. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the drill of the present invention;

[0021] Figure 2 It is an overall top view of the drill of the present invention;

[0022] Figure 3 It is a sectional view taken along the line C-C of the drill of the present invention;

[0023] In the figure: 1. U-shaped tube; 2. Check valve; 3. Shell; 4. Power cord; 5. Wing plate; 6. Motor; 7. Motor shaft; 8. Sealing ring; 9. Water passing hole plate; 10. Drill tool shaft; 11. Spiral fin; 12. Drill bit; A. Main body; B. Spiral drill tool. DETAILED DESCRIPTION OF THE INVENTION

[0024] The technical solution of the present invention will be further explained and illustrated below through specific embodiments.

[0025] Embodiment 1

[0026] Referring to the drawings, a one-time forming drill for a ground source heat pump heat exchange well includes a bell-shaped shell 3. A check valve 2 is arranged at the upper end of the shell 3. A U-shaped tube 1 is welded on the shell 3 above the check valve 2. Wing plates 5 are arranged at intervals on the outer periphery of the shell 1. A motor 6 is fixedly arranged in the inner cavity of the shell 1, and the power cord 4 of the motor 6 extends out of the shell 3. A sealing ring 8 is fixed at the connection between the motor shaft 7 and the spiral drill tool B, and the motor 6 is a reduction motor; at the lower end of the cavity of the shell 3, a water passing hole plate 9 is fixed, and the spiral drill tool B extends into the water passing hole plate 9 and is connected to the motor shaft 7; the spiral drill tool B in this device includes a drill tool shaft 10, spiral fins 11, and a drill bit 12; the drill bit 12 is located at the top of the drill tool shaft 10, and the spiral fins 11 are wound and fixed on the periphery of the drill tool shaft 10, wherein the outer diameter of the extension of the wing plate 5 is larger than the outer diameter of the spiral fins 11 in the spiral drill tool B.

[0027] Example 2

[0028] The working method of the one-time forming drill for the ground source heat pump heat exchange well in Example 1 includes the following steps:

[0029] After the motor 6 is powered on, it drives the spiral drill B to rotate and break through the soil and move forward. High-pressure water is injected from the ground end of the U-shaped pipe 1. The high-pressure water passes through the one-way water valve 2 and the water passing hole plate 9 at the bottom of the housing 3, impacts on the spiral fins 11 of the drill B, dissolves the broken soil and sand into mud, and returns to the ground along the gap between the outer wing plates 5 of the outer shell, taking out the soil, enabling the drill to continue moving downward, pulling the U-shaped pipe 1 to the deep underground, and completing the backfill.

Claims

1. A primary forming drill for a ground source heat pump heat exchange well, characterized in that, A one-way water valve is provided at the upper end of the housing. Wing plate pieces are arranged at intervals on the outer periphery of the housing. A motor is arranged in the inner cavity of the housing, and the power cord of the motor extends out of the housing. A water passing hole plate is fixed at the lower end of the housing cavity, and a spiral drill is inserted into the water passing hole plate and connected to the motor shaft. The spiral drill includes a drill shaft, spiral fins, and a drill bit. The drill bit is located at the top end of the drill shaft. The spiral fins are wound and fixed on the periphery of the drill shaft. A U-shaped pipe is welded on the housing above the one-way water valve. The housing is in the shape of a bell. The outer diameter of the extension of the wing plate piece is larger than the outer diameter of the spiral fins in the spiral drill.

2. The primary forming drill for the ground source heat pump heat exchange well according to claim 1, wherein A sealing ring is fixed at the connection between the motor shaft and the spiral drill.

3. The primary forming driller for a ground source heat pump heat exchange well according to claim 1, wherein, The motor is a reduction motor.

4. A working method of the primary forming drilling rig for the ground source heat pump heat exchange well according to claim 1, characterized in that, It includes the following steps: After the motor is powered on, it drives the spiral drill to rotate and break through the soil and move forward. High-pressure water is injected from the ground end of the U-shaped pipe. The high-pressure water passes through the one-way water valve and the water passing hole plate at the bottom of the housing and impacts on the spiral fins of the drill, dissolving the broken soil and sand into mud. The mud flows back to the ground along the gap between the outer wing plate pieces of the outer shell, taking out the soil, enabling the drill to continue to move downward, and pulling the U-shaped heat exchange pipe to the deep underground.

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