Underground turbine generator of geothermal recharge well

Abstract

The utility model relates to the technical field of geothermal recharge wells, and provides an underground turbine generator of a geothermal recharge well, which comprises a shell and a motor mounted in the shell. The shell is of a slender tubular structure, a gap exists between the shell and the motor, at least one flow guide part is fixed to the motor, at least one impeller is coaxially connected to the bottom of the motor, the flow guide part is a nozzle ring, a flow guide cover is installed at the bottom of the impeller, flange plates are fixed to the upper end and the lower end of the shell, and the impeller is an axial-flow impeller; the device has the advantages that potential energy of recharge water is recycled for power generation, and direct economic value is created; the motor can be cooled through flowing of the water flow, and a motor heat dissipation device does not need to be added; the structure is simple, the size is small and manufacturing is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of geothermal recharge wells, and particularly relates to an underground turbine generator for a geothermal recharge well. Background Art

[0002] Geothermal energy is a new clean energy. With the increasing environmental awareness and energy shortage, the rational development and utilization of geothermal resources has become more and more popular. In the current development and utilization, there is still a part of energy that is not used and wasted, that is, the potential energy of the reinjection water.

[0003] If the potential energy of the reinjected water is recovered to generate electricity and drive water pumps and other geothermal system equipment, the power consumption of the geothermal system will be reduced, achieving the effect of economy and energy saving and emission reduction. Therefore, the applicant proposed a geothermal reinjection well underground turbine generator to solve the above problems. Utility Model Content

[0004] In view of the above-mentioned technical problems existing in the prior art, an underground turbine generator for a geothermal recharge well is provided, which recycles the potential energy of the recharged water for power generation, thus creating direct economic value. The flow of water can cool the motor without adding a motor fan device. The generator has a simple structure, a small size and is easy to manufacture.

[0005] The purpose and effect of the utility model are achieved by the following specific technical means:

[0006] A downhole turbine generator for a geothermal recharge well, comprising a housing and a motor, wherein the motor is installed in the housing;

[0007] The shell is an elongated tubular structure, and there is a gap between the shell and the motor. At least one flow guide is fixed on the motor, and at least one impeller is coaxially connected to the bottom of the motor.

[0008] Optionally, the flow guide member is a nozzle ring.

[0009] Optionally, a guide cover is installed at the bottom of the impeller.

[0010] Optionally, flanges are fixed to both upper and lower ends of the shell.

[0011] Optionally, the impeller is an axial flow impeller.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The utility model fills the gap of underground generators for geothermal recharge wells;

[0014] 2. Recycling the potential energy of recharged water for power generation creates direct economic value;

[0015] 3. The flow of water can cool the motor, without the need to add a motor fan;

[0016] 4. Simple structure, small size, easy to make;

[0017] 5. The pipe-type structure design does not require changing the original geothermal system structure, is easy to install, and has low use and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall front cross-sectional structure of the utility model.

[0019] Markings in the figure: casing 1, motor 2, nozzle ring 3, impeller 4, guide cover 5, flange 6, geothermal recharge well a, pipeline b. DETAILED DESCRIPTION

[0020] See also Figure 1 , the embodiments of the utility model are further described;

[0021] A downhole turbine generator for a geothermal recharge well comprises a housing 1 and a motor 2, wherein the motor 2 is installed in the housing 1, and flanges 6 are fixed to the upper and lower ends of the housing 1. The depth of the geothermal recharge well (marked as a in the figure) is generally 2000-3000m, and the recharge pipe (marked as b in the figure) is generally tens of meters deep underground. The downhole turbine generator of the present application can be installed on the recharge pipe b through the flanges 6 at the upper and lower ends of the housing 1 to work, which greatly facilitates the use of users. The downhole turbine generator is connected to the recharge pipe b in a detachable connection mode (connected by the flange 6), which is convenient for maintenance and replacement of the downhole turbine generator;

[0022] Because the geothermal recharge well a is often very deep and has a small diameter, the housing 1 is set to a slender tubular structure, and there is a gap between the housing 1 and the motor 2 to facilitate the flow of recharge water. The flow of water can cool the motor 2, and there is no need to set up a separate device for heat dissipation of the motor 2. At least one guide is fixed on the motor 2 to guide the recharge water, change the direction of the water flow, and increase the flow rate of the recharge water. At least one impeller 4 is coaxially connected to the bottom of the motor 2. The recharge water with increased flow rate impacts the impeller 4 to rotate, thereby driving the motor 2 to rotate and generate electricity.

[0023] The working principle of the downhole turbine generator is as follows:

[0024] The reinjection water enters the outer shell 1 from the top of the inner part of the reinjection pipe b, and then flows through the gap between the outer shell 1 and the motor 2 to the guide member, and the flow direction of the reinjection water is changed and the flow velocity is increased through the guide member. Then, the reinjection water with increased flow velocity impacts the impeller 4 to rotate, thereby driving the motor 2 to rotate and generate electricity. The electric energy generated by the downhole turbine generator can be used for water pumps and other equipment in the geothermal system, and can also be returned to the external power grid for domestic and industrial electricity.

[0025] The advantages of this application are:

[0026] 1. The utility model fills the gap of underground generators for geothermal recharge wells;

[0027] 2. Recycling the potential energy of recharged water for power generation creates direct economic value;

[0028] 3. The flow of water can cool down the motor 2, without adding a motor fan;

[0029] 4. Simple structure, small size, easy to make.

[0030] 5. The pipe-type structure design does not require changing the original geothermal system structure, is easy to install, and has low use and maintenance costs.

[0031] The guide member is preferably a nozzle ring 3, which guides the reinjection water, changes the water flow direction, and also increases the reinjection water flow rate, thereby improving the power generation efficiency of the downhole turbine generator.

[0032] A flow guide shroud 5 is installed at the bottom of the impeller 4 , and the flow guide shroud 5 can reduce eddy currents and turbulences in the flow of the fluid, thereby reducing energy losses and further improving the working efficiency of the impeller 4 .

[0033] The impeller 4 is an axial flow impeller, which has a lower load rejection speed and a larger flow rate, ensuring the safe and stable operation of the generator and the geothermal system.

Claims

1. A downhole turbine generator for a geothermal recharge well, comprising a housing (1) and a motor (2), wherein the motor (2) is installed in the housing (1), and characterized in that: The housing (1) is a slender tubular structure, and there is a gap between the housing (1) and the motor (2). At least one flow guide is fixed on the motor (2), and at least one impeller (4) is coaxially connected to the bottom of the motor (2).

2. The downhole turbine generator for geothermal recharge well according to claim 1, characterized in that: The flow guide member is a nozzle ring (3).

3. The downhole turbine generator for geothermal recharge well according to claim 1, characterized in that: A flow guide cover (5) is installed at the bottom of the impeller (4).

4. The downhole turbine generator for geothermal recharge well according to claim 1, characterized in that: Flange plates (6) are fixed to both upper and lower ends of the housing (1).

5. The downhole turbine generator for geothermal recharge well according to claim 1, characterized in that: The impeller (4) is an axial flow impeller.

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