Natural working medium coaxial sleeve geothermal well heat supply system

Abstract

The utility model discloses a natural working medium coaxial sleeve geothermal well heat supply system, which relates to the technical field of coaxial sleeves, and comprises a heat exchange pipeline and a circulation pipeline, the circulation pipeline is sequentially connected with an evaporator, a compressor, a condenser and a throttling device through pipelines, the condenser is connected with a user side through a pipeline, and the throttling device is connected with the compressor through a pipeline. And a heat supply circulating pipe is connected between the heat exchange pipeline and the evaporator. According to the natural working medium coaxial sleeve geothermal well heat supply system, due to the fact that the evaporator, the compressor, the condenser and the throttling device are arranged on the circulation pipeline in a matched mode, geothermal energy obtained by the heat exchange pipeline can be efficiently conveyed to a user side, the utilization efficiency of geothermal energy is improved, the continuous heat supply effect is achieved, and meanwhile the heat supply efficiency is improved. And the condition that the inner pipe deviates can be prevented, and efficient flowing of an internal heat exchange medium can be kept.

Description

Technical Field

[0001] The utility model relates to the technical field of coaxial casings, and more particularly to a natural working medium coaxial casing geothermal well heating system. Background Art

[0002] A heat exchange geothermal well is a system that uses underground heat for heat exchange. It is primarily used for geothermal energy development and utilization, particularly in heating, hot water supply, and power generation. These wells are designed to extract heat from underground reservoirs efficiently and sustainably while minimizing environmental impact.

[0003] Chinese patent application number 201920192872.0 discloses a novel geothermal well inner tube heat exchange structure, which includes an outer tube, an inner tube, an outer tube heat exchange plug, and an inner tube heat exchange plug. The outer tube is a heat-conducting metal tube, and the inner tube is sleeved inside the outer tube. The outer tube heat exchange plug is provided at the bottom of the outer tube for sealing the bottom of the outer tube. The inner tube heat exchange plug is provided above the outer tube heat exchange plug, and the bottom surface of the inner tube heat exchange plug is in contact with the upper surface of the outer tube heat exchange plug. The inner tube heat exchange plug is sealed at the bottom of the inner tube. This novel geothermal well inner tube heat exchange structure still has the following problems when in use:

[0004] 1. The inner tube may move downward along the wellbore under the action of gravity, or due to factors such as ground settlement and soil compaction. This sinking may cause the relative position between the inner tube and the outer tube to change, affecting the normal operation of the system and the efficiency of heat exchange.

[0005] 2. When installing the inner tube into the outer tube, the position of the inner tube needs to be adjusted to keep it centered. Since there is no positioning structure at the bottom of the inner tube, it will increase the difficulty of coaxial positioning.

[0006] Therefore, it is necessary to propose a natural working fluid coaxial casing geothermal well heating system to solve the above problems. Utility Model Content

[0007] In response to the above problems, the utility model provides a natural working fluid coaxial casing geothermal well heating system, which has the function of improving the efficient utilization of geothermal energy. At the same time, it can maintain the coaxial setting of the inner and outer tubes and maintain the efficient flow of the internal heat exchange medium.

[0008] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0009] A natural working fluid coaxial casing geothermal well heating system includes a heat exchange pipe and a circulation pipe. The circulation pipe is sequentially connected to an evaporator, a compressor, a condenser, and a throttling device through pipes. The condenser is connected to a user end through a pipe. A heat supply circulation pipe is connected between the heat exchange pipe and the evaporator.

[0010] The heat exchange pipe includes an inner tube and an outer tube. The inner part of the outer tube is provided with an outer sleeve. The inner wall of the outer sleeve is connected to a circumferential array of support plates. The top of the support plate is provided with an inclined portion arranged toward the axis. The bottom of the inclined portion is provided with a positioning portion. The bottom of the inner tube is connected to the inner sleeve, and the inner sleeve is located on the top of the positioning portion.

[0011] Preferably, a through mixing groove is provided on the support plate, and the mixing groove is located at the bottom of the positioning portion.

[0012] Preferably, the mixing tank is connected to one end close to the outer sleeve with a guide plate, and the guide plate is arranged at an angle.

[0013] Preferably, a central tube is connected to the axis of the support plate, and a threaded boss is provided on the outer annular surface of the central tube.

[0014] Preferably, the end of the support plate is provided with through holes arranged at equal intervals.

[0015] Preferably, a groove is formed at one end of the positioning portion close to the inclined surface, and the bottom of the inner sleeve is located in the groove.

[0016] Preferably, the outer sleeve is provided with equally spaced telescopic ribs, and the telescopic ribs are located between two adjacent support plates.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. This device can efficiently transmit the geothermal energy obtained from the heat exchange pipeline to the user end through the coordinated arrangement of the evaporator, compressor, condenser and throttling device on the circulation pipeline, thereby improving the utilization efficiency of geothermal energy and achieving the effect of continuous heating.

[0019] 2. This device is provided with a support plate component inside the outer tube. The inclined portion on the support plate can guide the inner tube, guiding it to the positioning portion so that it remains coaxial with the outer tube, preventing the inner tube from deviating and maintaining efficient flow of the internal heat exchange medium. At the same time, the support plate can play a supporting role to prevent the inner tube from sinking. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the pipeline structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the inner tube and outer tube structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the support plate and central tube structure of the present invention;

[0023] Figure 4 This is a schematic diagram of the telescopic rib structure of the outer sleeve in the utility model.

[0024] Reference numerals:

[0025] 101. Heat exchange pipe; 102. Circulation pipeline; 103. Evaporator; 104. Compressor; 105. Condenser; 106. Throttling device; 107. Heating circulation pipe; 108. Inner pipe; 109. Outer pipe; 110. Outer sleeve; 111. Support plate; 112. Inclined portion; 113. Positioning portion; 114. Inner sleeve; 115. Mixing tank; 116. Guide plate; 117. Center pipe; 118. Threaded boss; 119. Through hole; 120. Groove; 121. Expansion rib. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] See also Figure 1-4 A natural working fluid coaxial casing geothermal well heating system includes a heat exchange pipe 101 and a circulation pipe 102. The circulation pipe 102 is sequentially connected to an evaporator 103, a compressor 104, a condenser 105 and a throttling device 106 through pipes. The evaporator 103, the compressor 104, the condenser 105 and the throttling device 106 are arranged in coordination to transport the heat extracted from the geothermal energy by the heat exchange pipe 101 to the user end. The condenser 105 is connected to the user end through a pipe. A heat supply circulation pipe 107 is connected between the heat exchange pipe 101 and the evaporator 103. The heat exchange medium in the circulation pipe flows back and forth to transport the heat in the geothermal well to the evaporator 103.

[0028] refer to Figure 2 and Figure 3 The heat exchange pipe 101 includes an inner pipe 108 and an outer pipe 109. The inner pipe 108 is sleeved inside the outer pipe 109. The heat exchange medium enters between the inner pipe 108 and the outer pipe 109 and then flows out from the inner pipe 108. Figure 2The flow state of the heat exchange medium in the outer tube 109 is such that the heat exchange medium exchanges heat with the surrounding rock and soil during the flow process, thereby increasing the temperature. The outer tube 109 is sheathed with an outer sleeve 110. The inner wall of the outer sleeve 110 is connected with a circumferential array of support plates 111. The support plates 111 are circumferentially arrayed on the inner annular surface of the outer sleeve 110. The inner tube 108 is moved toward the axis through the upper inclined portion 112. The top of the support plate 111 is provided with an inclined portion 112 arranged toward the axis. The bottom of the inclined portion 112 is provided with a positioning portion 113. The positioning portion 113 is a horizontal surface for receiving the bottom of the inner tube 108 so that The inner tube 108 and the outer tube 109 are in a coaxial state, and the bottom of the inner tube 108 is connected to the inner sleeve 114, and the inner sleeve 114 is located at the top of the positioning portion 113. Specifically, after the outer tube 109 is fixed, the support plate 111 is lowered into the outer tube 109 through the outer sleeve 110, and then the inner tube 108 is lowered. During the lowering process of the inner tube 108, it will come into contact with the inclined portion 112, thereby sliding toward the axis of the outer tube 109, and then pressing on the positioning portion 113 to complete the positioning. When in use, the support plate 111 can play a supporting role to prevent the inner tube 108 from sagging.

[0029] Specifically, refer to Figure 2 and Figure 3 A mixing groove 115 is provided on the support plate 111. Since the support plate 111 divides the downward-flowing heat exchange medium into multiple streams, the mixing groove 115 can mix the multiple streams of heat exchange medium, slowing down the flow speed and improving the heat exchange efficiency. The mixing groove 115 is located at the bottom of the positioning portion 113.

[0030] Specifically, refer to Figure 3 and Figure 4 The mixing tank 115 is connected to a guide plate 116 at one end close to the outer sleeve 110, which is used to guide multiple streams of heat exchange medium to the central tube 117, so that the heat exchange medium rotates around the central tube 117, thereby generating mixing. The guide plate 116 is set at an angle.

[0031] Specifically, refer to Figure 3 and Figure 4 The support plate 111 is connected to a central tube 117 at its axis. The central tube 117 is used to mix multiple streams of heat exchange medium more evenly, which is beneficial to breaking the boundary layer of the fluid medium. A threaded boss 118 is provided on the outer ring surface of the central tube 117.

[0032] Specifically, refer to Figure 3 and Figure 4The end of the support plate 111 is provided with through holes 119 arranged at equal intervals. The through holes 119 are used to allow the heat exchange medium at the boundary to flow mutually, thereby destroying the boundary layer and improving the heat exchange efficiency.

[0033] Specifically, refer to Figure 3 and Figure 4 A groove 120 is formed at one end of the positioning portion 113 close to the inclined surface. The groove 120 is used to enhance the fixing ability of the inner tube 108 so that it is not easy to shake. The bottom of the inner sleeve 114 is located in the groove 120.

[0034] Specifically, refer to Figure 4 The outer sleeve 110 is provided with equally spaced telescopic ribs 121. When the outer sleeve 110 is lowered inside the outer tube 109, the diameter of the outer tube 109 will decrease due to bending. The telescopic ribs 121 can reduce the diameter of the outer sleeve 110 by compression, thereby passing through the area with reduced diameter. The telescopic ribs 121 are located between two adjacent support plates 111.

[0035] In this embodiment, the starting system starts the compressor 104 in the natural working fluid circulation loop, causing the natural working fluid to flow in the circulation pipeline 102. The natural working fluid absorbs heat from the geothermal well in the evaporator 103 and becomes gaseous, and then is compressed and heated by the compressor 104, enters the condenser 105 to release heat, and the heat is transported to the user end through the pipeline.

[0036] The outer sleeve 110 with the support plate 111 is located inside the outer tube 109 . When the inner tube 108 is lowered, it moves to the positioning portion 113 through the inclined portion 112 , thereby maintaining a coaxial arrangement with the outer tube 109 .

[0037] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A natural working fluid coaxial casing geothermal well heating system, comprising a heat exchange pipe (101) and a circulation pipe (102), characterized in that: The circulation pipeline (102) is sequentially connected to an evaporator (103), a compressor (104), a condenser (105) and a throttling device (106) through pipelines; the condenser (105) is connected to a user end through pipelines; a heat supply circulation pipe (107) is connected between the heat exchange pipe (101) and the evaporator (103); The heat exchange pipe (101) comprises an inner tube (108) and an outer tube (109); an outer sleeve (110) is provided inside the outer tube (109); a circumferential array of support plates (111) is connected to the inner wall of the outer sleeve (110); a sloped portion (112) arranged toward the axis is provided on the top of the support plate (111); a positioning portion (113) is provided at the bottom of the sloped portion (112); an inner sleeve (114) is connected to the bottom of the inner tube (108); and the inner sleeve (114) is located at the top of the positioning portion (113).

2. The natural working fluid coaxial casing geothermal well heating system according to claim 1, characterized in that: The support plate (111) is provided with a mixing groove (115) extending therethrough, and the mixing groove (115) is located at the bottom of the positioning portion (113).

3. The natural working fluid coaxial casing geothermal well heating system according to claim 2, characterized in that: One end of the mixing tank (115) close to the outer sleeve (110) is connected to a guide plate (116), and the guide plate (116) is arranged at an angle.

4. The natural working fluid coaxial casing geothermal well heating system according to claim 1, characterized in that: The support plate (111) is connected to a central tube (117) at its axis, and a threaded boss (118) is provided on the outer annular surface of the central tube (117).

5. The natural working fluid coaxial casing geothermal well heating system according to claim 1, characterized in that: The end of the support plate (111) is provided with through holes (119) arranged at equal intervals.

6. The natural working fluid coaxial casing geothermal well heating system according to claim 1, characterized in that: A groove (120) is provided at one end of the positioning portion (113) close to the inclined surface, and the bottom of the inner sleeve (114) is located in the groove (120).

7. The natural working fluid coaxial casing geothermal well heating system according to claim 1, characterized in that: The outer sleeve (110) is provided with equally spaced stretch ribs (121). The telescopic rib (121) is located between two adjacent support plates (111).

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