Single well heat exchange system adopting low heat exchange gap to efficiently exchange heat

Abstract

The single well heat exchange system comprises an outer sleeve, an injection connector is fixedly installed on the upper end face of the outer sleeve, an injection pipe is arranged in the portion, below the injection connector, of the outer sleeve, a guide-out cavity is formed in the side surface of the outer sleeve, and the guide-out cavity is communicated with the injection connector. And a heat exchange cavity is formed in the outer side surface of the guiding-out cavity, a guiding-out connector is fixedly connected to the upper end of the guiding-out cavity, a gap adjusting mechanism is arranged at the lower end of the outer sleeve, and the heat exchange efficiency is adjusted by controlling the flow of a heat exchange medium. According to the single well heat exchange system adopting the low heat exchange gap and efficient heat exchange, the gap adjusting block is arranged at the lower end of the outer sleeve, and the flow of a heat exchange medium is controlled by adjusting the gap between the gap adjusting block and the flow guide cavity in the vertical sliding process; therefore, the heat exchange medium can carry out more efficient heat exchange at different flow speeds, and the purpose of improving the heat exchange efficiency is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of geothermal wells, in particular to a single well heat exchange system which adopts a low heat exchange gap and high efficiency heat exchange. Background Art

[0002] With the continuous growth of energy demand and the increasing attention to environmental protection, geothermal resources, as a clean and renewable energy source, have received widespread attention and application. The geothermal well single-well heat exchange system is a technology that uses geothermal resources for heat exchange. It injects the heat exchange medium into the geothermal well to exchange heat with the underground geothermal resources, and then transports the heat exchanged medium out for heating, cooling or other heat utilization purposes. The current geothermal well single-well heat exchange system has some shortcomings in practical applications. One of the main problems is that the flow rate of the heat exchange medium cannot be automatically controlled according to the temperature of the heat exchange medium. In the actual operation process, the temperature of the heat exchange medium will fluctuate with the temperature changes of the underground geothermal resources, the changes in the system load and other factors. However, the existing system cannot automatically adjust the flow rate according to the temperature changes of the heat exchange medium, which may lead to the following problems:

[0003] On the one hand, when the temperature of the heat exchange medium is high, if the flow rate cannot be increased accordingly, it may cause energy waste, because the excessively high temperature may have been able to meet the heat utilization demand. At this time, continuing to operate at a smaller flow rate may cause the system to overheat and affect the stability and life of the system. On the other hand, when the temperature of the heat exchange medium is low, if the flow rate cannot be reduced accordingly, it may not be able to meet the heat utilization demand, which will lead to poor heating effect and affect the user experience.

[0004] In summary, the existing geothermal well single-well heat exchange system has certain limitations in energy utilization efficiency and system performance because it cannot automatically control the flow of the heat exchange medium according to the temperature of the heat exchange medium, and needs to be improved and innovated. Utility Model Content

[0005] The utility model aims to provide a single well heat exchange system with low heat exchange gap and high efficiency, so as to solve the problem that the flow rate of the heat exchange medium mentioned in the above background technology cannot be automatically regulated according to the temperature.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a single-well heat exchange system with low heat exchange gap and high efficiency heat exchange, comprising an outer sleeve, an injection joint is fixedly installed on the upper end surface of the outer sleeve, and an injection pipe is opened inside the outer sleeve below the injection joint, an outlet cavity is opened inside the side surface of the outer sleeve, and a heat exchange cavity is opened on the outer surface of the outlet cavity, the upper end of the outlet cavity is fixedly connected with the outlet joint, and the lower end of the outer sleeve is provided with a gap adjustment mechanism, so as to adjust the heat exchange efficiency by controlling the flow rate of the heat exchange medium.

[0007] Preferably, the gap adjusting mechanism includes: a diversion cavity which is formed inside the lower end of the outer casing. A gap adjusting block is arranged inside the diversion cavity, and a gap adjusting rod is fixedly arranged at the upper end of the gap adjusting block. The upper end of the gap adjusting rod is fixedly provided with a support plate.

[0008] With the above technical solution, the support plate can drive the gap adjusting block to slide inside the diversion cavity through the gap adjusting rod to adjust the flow-through gap.

[0009] Preferably, the heat exchange cavity is obliquely designed, and the lower end of the heat exchange cavity is communicated with the outlet cavity.

[0010] With the above technical solution, the heat exchange cavity enables the heat exchange medium to fully exchange heat with the ground heat source.

[0011] Preferably, the lower end of the gap adjusting block is conically designed, and the upper end of the gap adjusting block is cylindrically designed. The upper end of the gap adjusting block is in sliding friction connection with the diversion cavity, and there is a gap between the lower end side surface of the gap adjusting block and the inner side surface of the lower end of the diversion cavity. Both ends of the diversion cavity are respectively penetrated by the injection pipe and the lower end of the outlet cavity.

[0012] With the above technical solution, the gap adjusting block can change the gap with the diversion cavity by sliding, so that the flow rate of the heat exchange medium flowing through per unit time changes.

[0013] Preferably, an automatic adjusting mechanism is arranged between the lower surface of the support plate and the upper end of the outlet joint. By monitoring the temperature of the output heat exchange medium, it is ensured that the temperature difference between the heat exchange medium and the ground heat source is always within a suitable range to improve the heat exchange efficiency.

[0014] With the above technical solution, when the temperature of the output heat exchange medium is low, the output temperature of the heat exchange medium can be increased by reducing the gap between the gap adjusting block and the diversion cavity.

[0015] Preferably, the automatic adjusting mechanism includes: a transfer ring. A transfer cavity is formed inside the lower end of the transfer ring. A discharge joint is fixedly installed on the outer side surface of the transfer ring, and one end of the discharge joint is communicated with the transfer cavity. An expansion cavity is formed inside the upper end of the transfer ring. A piston cylinder is fixedly arranged on the inner top surface of the expansion cavity. One end of a piston rod is arranged inside the piston cylinder. The upper end of the piston rod penetrates through the upper surface of the transfer ring and is fixedly connected with the lower surface of the support plate.

[0016] With the above technical solution, the piston rod can drive the support plate to slide under the action of pressure.

[0017] Preferably, the transfer ring is designed in a ring shape. The lower end of the transfer cavity communicates with the upper end of the outlet joint. The piston cylinder and the piston rod are in sliding friction connection, and there is a gap between the lower end of the piston cylinder and the inner bottom surface of the expansion cavity.

[0018] With the above technical solution, when the temperature changes in the expansion cavity, the piston rod is pushed by pressure.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows: The single-well heat exchange system that uses a low heat exchange gap for efficient heat exchange:

[0020] 1. By setting a gap-adjusting block at the lower end of the outer casing, the flow rate of the heat exchange medium is controlled by adjusting the gap between the gap-adjusting block and the diversion cavity during the up and down sliding process of the gap-adjusting block, so that the heat exchange medium can perform more efficient heat exchange at different flow rates to achieve the purpose of improving the heat exchange efficiency;

[0021] 2. Further, when the output temperature of the heat exchange medium is relatively high, the internal gas in the expansion cavity expands to push the piston rod to slide upward inside the expansion cavity, so that the support plate can be pushed to drive the gap-adjusting rod and the gap-adjusting block to slide upward, so as to achieve the purpose of increasing the gap between the gap-adjusting blocks, thereby realizing the control of the flow rate of the heat exchange medium and avoiding the reduction of the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic three-dimensional structure diagram of the whole of the present utility model;

[0023] Figure 2 is a schematic three-dimensional structure diagram of the whole cross-section of the present utility model;

[0024] Figure 3 is a schematic three-dimensional structure diagram of the connection cross-section of the outer casing, the diversion cavity and the gap-adjusting block of the present utility model;

[0025] Figure 4 is a schematic three-dimensional structure diagram of the connection cross-section of the support plate and the piston rod of the present utility model;

[0026] Figure 5 is a schematic three-dimensional structure diagram of the connection cross-section of the transfer ring, the transfer cavity and the discharge joint of the present utility model;

[0027] Figure 6 is a schematic three-dimensional structure diagram of the connection cross-section of the expansion cavity, the piston cylinder and the piston rod of the present utility model.

[0028] In the figure: 1. Outer casing; 2. Injection joint; 3. Injection pipe; 4. Diversion cavity; 5. Outlet cavity; 6. Heat exchange cavity; 7. Gap-adjusting block; 8. Gap-adjusting rod; 9. Support plate; 10. Outlet joint; 11. Transfer ring; 12. Transfer cavity; 13. Discharge joint; 14. Expansion cavity; 15. Piston cylinder; 16. Piston rod. Detailed implementation manners

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0030] Please refer to Figures 1 - 6 , the present utility model provides a technical solution: a single-well heat exchange system with high-efficiency heat exchange using a low heat exchange gap.

[0031] Embodiment 1

[0032] In this embodiment, it is disclosed that: an outer sleeve 1, an injection joint 2 is fixedly installed on the upper end surface of the outer sleeve 1, and an injection pipe 3 is provided inside the outer sleeve 1 below the injection joint 2. A lead-out cavity 5 is provided inside the side surface of the outer sleeve 1, and a heat exchange cavity 6 is provided on the outer surface of the lead-out cavity 5. The upper end of the lead-out cavity 5 is fixedly connected to a lead-out joint 10. A gap adjustment mechanism is provided at the lower end of the outer sleeve 1 to adjust the heat exchange efficiency by controlling the flow rate of the heat exchange medium;

[0033] The gap adjustment mechanism includes: a diversion cavity 4, the diversion cavity 4 is provided inside the lower end of the outer sleeve 1, and a gap adjustment block 7 is provided inside the diversion cavity 4. And a gap adjustment rod 8 is fixedly provided at the upper end of the gap adjustment block 7, and a support plate 9 is fixedly provided at the upper end of the gap adjustment rod 8;

[0034] The heat exchange cavity 6 is obliquely designed, and the lower end of the heat exchange cavity 6 is communicated with the lead-out cavity 5;

[0035] The lower end of the gap adjustment block 7 is conically designed, and the upper end of the gap adjustment block 7 is cylindrically designed. The upper end of the gap adjustment block 7 is in sliding friction connection with the diversion cavity 4, and there is a gap between the lower side surface of the gap adjustment block 7 and the inner side surface of the lower end of the diversion cavity 4. And both ends of the diversion cavity 4 are penetrated by the injection pipe 3 and the lower end of the lead-out cavity 5 respectively;

[0036] When it is necessary to control the flow rate of the heat exchange medium, the support plate 9 is driven to slide. The support plate 9 drives the gap adjustment block 7 to slide relative to the diversion cavity 4 through the gap adjustment rod 8, so that the gap between the gap adjustment block 7 and the diversion cavity 4 changes. At this time, the rate of the heat exchange medium when being transported from the injection joint 2 and the injection pipe 3 to the lead-out cavity 5 is affected by the change of the gap between the gap adjustment block 7 and the diversion cavity 4 and changes, achieving the purpose of adjusting the injection rate of the heat exchange medium. At this time, after the heat exchange medium enters the lead-out cavity 5, it exchanges heat with the ground heat source through the heat exchange cavity 6 and is finally output to the outside of the outer sleeve 1 through the lead-out joint 10.

[0037] Embodiment 2

[0038] This embodiment discloses on the basis of Embodiment 1: An automatic adjustment mechanism is provided between the lower surface of the support plate 9 and the upper end of the export joint 10. By monitoring the temperature of the output heat exchange medium, it is ensured that there is always an appropriate temperature difference between the heat exchange medium and the ground heat source, so as to improve the heat exchange efficiency.

[0039] The automatic adjustment mechanism includes: a transfer ring 11. An internal transfer cavity 12 is opened at the lower end of the transfer ring 11. A discharge joint 13 is fixedly installed on the outer surface of the transfer ring 11, and one end of the discharge joint 13 is communicated with the transfer cavity 12. An expansion cavity 14 is opened at the upper end of the transfer ring 11. A piston cylinder 15 is fixedly arranged on the inner top surface of the expansion cavity 14. One end of a piston rod 16 is arranged inside the piston cylinder 15. The upper end of the piston rod 16 penetrates the upper surface of the transfer ring 11 and is fixedly connected to the lower surface of the support plate 9.

[0040] The transfer ring 11 is of a ring design. The lower end of the transfer cavity 12 is communicated with the upper end of the export joint 10. The piston cylinder 15 and the piston rod 16 are in a sliding friction connection, and there is a gap between the lower end of the piston cylinder 15 and the inner bottom surface of the expansion cavity 14.

[0041] When the temperature of the heat exchange medium changes, the output heat exchange medium is injected into the transfer cavity 12 through the export joint 10 and finally discharged from the transfer ring 11 through the discharge joint 13. At this time, the temperature in the expansion cavity 14 is affected by the temperature of the output heat exchange medium, causing the pressure inside the expansion cavity 14 to change. The expansion cavity 14 drives the piston rod 16 in the piston cylinder 15 to slide through the pressure change, so as to drive the support plate 9 to move up and down, so that the gap between the diversion cavity 4 and the gap adjustment block 7 can be adjusted to ensure an appropriate temperature difference between the heat exchange medium and the ground heat source, so as to improve the overall heat exchange efficiency.

[0042] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A single well heat exchange system with high efficiency heat exchange using low heat exchange gap, comprising an outer casing (1), an injection joint (2) fixedly mounted on the upper end surface of the outer casing (1), an injection pipe (3) provided inside the outer casing (1) below the injection joint (2), a discharge cavity (5) provided inside the side surface of the outer casing (1), a heat exchange cavity (6) provided on the outer side surface of the discharge cavity (5), a discharge joint (10) fixedly connected to the upper end of the discharge cavity (5), characterized in that: The lower end of the outer sleeve (1) is provided with a gap adjustment mechanism, which adjusts the heat exchange efficiency by controlling the flow rate of the heat exchange medium.

2. A single well heat exchange system with high efficiency heat exchange using low heat exchange gap according to claim 1, characterized in that: The gap adjustment mechanism comprises: a flow guide cavity (4), the flow guide cavity (4) being opened inside the lower end of the outer sleeve (1), and a gap adjustment block (7) being arranged inside the flow guide cavity (4), and a gap adjustment rod (8) being fixedly arranged at the upper end of the gap adjustment block (7), and a support plate (9) being fixedly arranged at the upper end of the gap adjustment rod (8).

3. A single well heat exchange system with high efficiency heat exchange using low heat exchange gap according to claim 2, characterized in that: The heat exchange chamber (6) is designed to be inclined, and the lower end of the heat exchange chamber (6) is connected to the outlet chamber (5).

4. The single-well heat exchange system with high efficiency heat exchange using low heat exchange gap according to claim 2, characterized in that: The lower end of the gap adjusting block (7) is of conical design, and the upper end of the gap adjusting block (7) is of cylindrical design. The upper end of the gap adjusting block (7) is in sliding friction connection with the flow guiding cavity (4), and a gap is left between the lower end side surface of the gap adjusting block (7) and the lower end inner surface of the flow guiding cavity (4), and the two ends of the flow guiding cavity (4) are respectively penetrated by the lower ends of the injection pipe (3) and the outlet cavity (5).

5. The single-well heat exchange system with high efficiency heat exchange using low heat exchange gap according to claim 2, characterized in that: An automatic adjustment mechanism is provided between the lower surface of the support plate (9) and the upper end of the outlet joint (10), and the temperature of the output heat exchange medium is monitored to ensure that the temperature difference between the heat exchange medium and the geothermal source is always within a suitable range, thereby improving the efficiency of heat exchange.

6. A single well heat exchange system with high efficiency heat exchange using low heat exchange gap according to claim 5, characterized in that: The automatic adjustment mechanism comprises: a transfer ring (11), a transfer chamber (12) is provided inside the lower end of the transfer ring (11), and a discharge joint (13) is fixedly installed on the outer surface of the transfer ring (11), and one end of the discharge joint (13) is connected to the transfer chamber (12); an expansion chamber (14) is provided inside the upper end of the transfer ring (11), and a piston cylinder (15) is fixedly provided on the internal top surface of the expansion chamber (14), and one end of a piston rod (16) is provided inside the piston cylinder (15), and the upper end of the piston rod (16) passes through the upper surface of the transfer ring (11) and is fixedly connected to the lower surface of the support plate (9).

7. A single well heat exchange system with high efficiency heat exchange using low heat exchange gap according to claim 6, characterized in that: The transfer ring (11) is of annular design, the lower end of the transfer chamber (12) is connected to the upper end of the outlet joint (10), the piston cylinder (15) and the piston rod (16) are connected by sliding friction, and a gap is left between the lower end of the piston cylinder (15) and the inner bottom surface of the expansion chamber (14).

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