Coaxial sleeve heat exchange device of middle-layer geothermal well

Abstract

The utility model discloses a coaxial sleeve heat exchange device of a middle-layer geothermal well, which relates to the technical field of heat exchange pipelines, and comprises an outer pipe and an inner pipe sleeved in the outer pipe, the top of the outer pipe is connected with a first galvanized steel pipe, the first galvanized steel pipe is connected with a water inlet pipe, the top of the inner pipe is connected with a second galvanized steel pipe, and the second galvanized steel pipe is connected with a water outlet pipe. An upper flange plate is connected to the outer wall of the second galvanized steel pipe, a lower flange plate is connected to the top of the first galvanized steel pipe, and the upper flange plate and the lower flange plate are connected through a bolt. According to the coaxial sleeve heat exchange device of the middle-layer geothermal well, the water inlet pipe and the optical fiber can be detachably installed on the outer pipe, so that a heat exchange medium can smoothly enter the geothermal well, water temperature is monitored, the effect of utilizing geothermal energy is achieved, and meanwhile the inner pipe and the outer pipe can be automatically coaxial during installation.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange pipes, and more specifically to a coaxial casing heat exchange device for a middle-layer geothermal well. Background Art

[0002] A heat exchange geothermal well is a system that uses underground heat energy for heat exchange. It is mainly used for the development and utilization of geothermal energy, especially in the fields of heating, hot water supply and power generation. This type of geothermal well is designed to extract heat from underground reservoirs efficiently and sustainably while reducing the impact on the environment. The types of geothermal energy currently developed and utilized are mainly divided into shallow geothermal energy, middle geothermal energy and deep geothermal energy. In the utilization of geothermal resources, the buried pipe system has the advantages of not being restricted by groundwater resources, no pollution to the environment, not being affected by external factors such as seasons and climate, and good system stability.

[0003] Chinese patent application number 202120976358.3 discloses a high-efficiency coaxial shell and tube heat exchanger, the structure of which includes an inner tube and an outer tube which is sleeved outside the inner tube and closed at one end, an inlet channel is formed between the inner wall of the outer tube and the outer wall of the outer tube, and an outlet channel which is connected to the inlet channel and has a reduced cross-sectional area is formed in the inner tube; the inner wall of the outer tube is provided with a corrugated structure evenly distributed along the axial direction. The outer tube of the shell and tube heat exchanger of the utility model adopts a stainless steel metal tube with corrugations on the inner wall, which is beneficial to reduce the heat transfer resistance between the fluid and the soil, strengthen the heat exchange between the outer tube and the soil, and the liquid working medium is not easy to scale on the tube wall. At the same time, the shockproof performance is improved, and it has a high pressure bearing capacity and corrosion resistance. This kind of high-efficiency coaxial shell and tube heat exchanger also has the following problems when in use:

[0004] 1. The water inlet and outlet of the heat exchange pipe are adjacent, where the temperature difference of the heat exchange fluid medium is the largest. The high-temperature fluid medium in the inner tube exchanges heat with the low-temperature fluid medium outside through the inner tube wall, resulting in the temperature of the water outlet failing to meet the standard. At the same time, the fluid medium entering from the casing liquid inlet will impact the inner tube, increasing the instability of the inner tube, which will not only cause the pipeline to shake, but also cause the inner tube to deform;

[0005] 2. Flange is a commonly used connection method for casing and inner pipe, which allows detachable connection between pipes, has good sealing and easy maintenance. During the installation of flange, the two flanges need to be aligned before they can be fixed with bolts. However, the inner pipe at the bottom is longer and heavier, which makes it inconvenient to move back and forth for adjustment.

[0006] Therefore, it is necessary to propose a coaxial casing heat exchange device for a mid-layer geothermal well to solve the above problems. Utility Model Content

[0007] In view of the above problems, the utility model provides a coaxial casing heat exchange device for a middle-layer geothermal well; it has the function of facilitating the coaxial positioning of the upper flange and the lower flange, while having the effect of increasing the sealing ability and reducing the impact force of the water flow on the inner pipe.

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

[0009] A coaxial casing heat exchange device for a mid-layer geothermal well, comprising an outer tube and an inner tube sleeved in the outer tube, the top of the outer tube is connected to a first galvanized steel tube, the first galvanized steel tube is connected to a water inlet pipe, the top of the inner tube is connected to a second galvanized steel tube, the outer wall of the second galvanized steel tube is connected to an upper flange, the top of the first galvanized steel tube is connected to a lower flange, and the upper flange and the lower flange are connected by bolts;

[0010] The inner ring surface of the lower flange is connected with a bevel ring, the bottom of the upper flange is connected with a tapered sleeve that can contact the bevel ring, the top outer ring surface of the tapered sleeve is provided with an extrusion portion corresponding to the bevel of the bevel ring, and a sealing rubber ring is provided in the extrusion portion;

[0011] The bottom of the conical sleeve is connected to a heat-insulating sleeve, which is arranged on the outer wall of the second galvanized steel pipe and the inner pipe, and the outer ring surface of the heat-insulating sleeve is slidably connected to a water-guiding sleeve up and down, and one end of the water-guiding sleeve is provided with a water-guiding slope, which is arranged toward the water inlet pipe;

[0012] A fixing strip passing through the water guide sleeve is arranged on the side of the heat insulation sleeve close to the water inlet pipe, and threaded holes are evenly distributed on the surface of the fixing strip. Symmetrical positioning blocks are connected to the outer wall of the fixing strip by bolts, and the positioning blocks are symmetrically located at the upper and lower ends of the water guide sleeve. A protrusion is arranged on the side of the positioning block close to the water guide sleeve, and grooves corresponding to the protrusions are opened on the upper and lower sides of the water guide sleeve.

[0013] Preferably, the water guide sleeve is provided with an opening on one side away from the water inlet pipe, and ribs are symmetrically provided on both sides, and the symmetrical ribs are connected by bolts.

[0014] Preferably, a first reducing tee and a second reducing tee are sleeved on the outer wall of the first galvanized steel pipe, the water inlet pipe is connected to the first reducing tee, and a light soldering iron is installed at one end of the second reducing tee.

[0015] Preferably, a water outlet pipe is connected to the top of the second galvanized steel pipe.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. By arranging the first reducing tee and the second reducing tee on the first galvanized steel pipe, the water inlet pipe and the optical fiber can be detachably installed on the outer pipe, so that the heat exchange medium can smoothly enter the geothermal well and monitor the water temperature. The heat exchange medium exchanges heat with the depth, thereby achieving the utilization effect of geothermal energy.

[0018] 2. The device is provided with a conical sleeve component at the bottom of the upper flange. When the upper flange moves downward, it can automatically keep the center through contact with the bevel ring, which solves the problem of manually keeping the two flanges centered when installing the inner tube and the outer tube. It has the function of automatic positioning. At the same time, the sealing rubber ring in the extrusion part can increase the sealing ability of the connection.

[0019] 3. The device is provided with a water guide sleeve component with an inclined surface, which can guide the incoming water flow to both sides to reduce the impact of the water flow on the inner tube, and has the effect of maintaining the stability of the inner tube. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 2 It is a schematic diagram of the connection between the upper flange and the lower flange in the utility model;

[0022] Figure 3 It is a schematic diagram of the positional relationship between the water guide sleeve and the positioning block in the utility model;

[0023] Figure 4 It is a schematic diagram of the water guide jacket in the utility model.

[0024] Reference numerals:

[0025] 101. Outer pipe; 102. Inner pipe; 103. First reducing tee; 104. Second reducing tee; 105. Water inlet pipe; 106. Optical solder; 107. Upper flange; 108. Lower flange; 109. Bevel ring; 110. Conical sleeve; 111. Extrusion part; 112. Sealing rubber ring; 113. Insulating sleeve; 114. Water guide sleeve; 115. Fixing strip; 116. Positioning block; 117. Bump; 118. Groove; 119. Retaining edge; 120. First galvanized steel pipe; 121. Second galvanized steel pipe; 122. Water outlet pipe. DETAILED DESCRIPTION

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

[0027] See also Figure 1-4 A coaxial casing heat exchange device for a mid-layer geothermal well includes an outer tube 101 and an inner tube 102 sleeved inside the outer tube 101. The inner tube 102 is sleeved inside the outer tube 101. A heat exchange medium enters the area between the inner tube 102 and the outer tube 101 through an inlet pipe 105. After the heat exchange medium exchanges heat with the surrounding rock formation, it enters the inner tube 102 from the bottom of the inner tube 102 and finally returns to the ground from the outlet pipe 122 at the top. Figure 1 , Figure 1 The left side is a schematic diagram of the inner tube 102 and the outer tube 101 installed together, and the right side is a schematic diagram of the structure of the inner tube 102. The top of the outer tube 101 is connected to a first galvanized steel tube 120, and the first galvanized steel tube 120 is connected to a water inlet pipe 105. A steel-plastic conversion head is connected between the first galvanized steel tube 120 and the water inlet pipe 105. The top of the inner tube 102 is connected to a second galvanized steel tube 121, and an upper flange 107 is connected to the outer wall of the second galvanized steel tube 121. The top of the first galvanized steel tube 120 is connected to a lower flange 108, and the upper flange 107 and the lower flange 108 are connected by bolts. Preferably, in one embodiment, the first galvanized steel tube 120 is a galvanized steel tube DN80, the second galvanized steel tube 121 is a galvanized steel tube DN50, and the water inlet pipe 105 and the water outlet pipe 122 are PERT-Ⅱ type pipe De50;

[0028] The upper flange 107 and the lower flange 108 need to be manually aligned when they are assembled. The following provides a structure that can automatically align the upper flange 107 on the lower flange 108: Figures 2 to 4The inner ring surface of the lower flange 108 is connected with a bevel ring 109, and the bottom of the upper flange 107 is connected with a tapered sleeve 110 that can contact the bevel ring 109. The tapered sleeve 110 can pass through the bevel ring 109. The top outer ring surface of the tapered sleeve 110 is provided with an extrusion portion 111 corresponding to the bevel of the bevel ring 109. A sealing rubber ring 112 is provided in the extrusion portion 111. When the inner tube 102 is placed in the outer tube 101, the upper flange 107 will move toward the lower flange 108 due to the effect of gravity. During the movement, the tapered sleeve 110 will pass through the inside of the bevel ring 109. At this time, the outer ring surface of the tapered sleeve 110 will come into contact with the inner ring surface of the bevel ring 109. Because the top of the tapered sleeve 110 is larger than the bottom, it can automatically stay in the center after moving to the bottom, and no manual centering adjustment is required. At the same time, after moving to the bottom, the bevel ring 109 will come into contact with the extrusion part 111, and squeeze the sealing rubber ring 112 in the extrusion part 111, which can increase the sealing performance of the connection between the outer tube 101 and the inner tube 102.

[0029] refer to Figures 2 to 4 The bottom of the conical sleeve 110 is connected with a heat insulating sleeve 113, which is sleeved on the outer wall of the second galvanized steel pipe 121 and the inner pipe 102. The heat insulating sleeve 113 is made of a heat insulating material and can reduce the heat exchange of the heat exchange medium inside and outside the inner pipe 102. The outer annular surface of the heat insulating sleeve 113 is slidably connected with a water guide sleeve 114 up and down. The water guide sleeve 114 has the function of guiding the water flow, and is used to guide the water flow to both sides to reduce the impact force of the water flow on the inner pipe 102. One end of the water guide sleeve 114 is provided with a water guide slope, and the water guide slope is arranged toward the water inlet pipe 105;

[0030] refer to Figures 2 to 4 A fixing strip 115 penetrating the water guide sleeve 114 is provided on one side of the heat insulation sleeve 113 close to the water inlet pipe 105. The fixing strip 115 is used to fix the positioning block 116. The positioning blocks 116 arranged up and down can start the positioning of the water guide sleeve 114 to prevent the water guide sleeve 114 from being displaced. The surface of the fixing strip 115 is evenly distributed with threaded holes. Symmetrical positioning blocks 116 are connected to the outer wall of the fixing strip 115 by bolts. The symmetrical positioning blocks 116 are located at the upper and lower ends of the water guide sleeve 114. A protrusion 117 is provided on one side of the positioning block 116 close to the water guide sleeve 114. The positioning block 116 is installed on the fixing strip 115, which can fix the water guide sleeve 114 at a specified position. The protrusion 117 at one end is inserted into the groove 118 to enhance the connection. Grooves 118 corresponding to the protrusions 117 are provided on the upper and lower sides of the water guide sleeve 114.

[0031] Specifically, refer to Figure 4The water guide sleeve 114 is set with an opening on one side away from the water inlet pipe 105, and ribs 119 are symmetrically arranged on both sides. When the position of the water guide sleeve 114 needs to be adjusted, the positioning blocks 116 on the upper and lower sides of the water guide sleeve 114 are removed, and then the bolts between the ribs 119 are loosened. The distance between the two ribs 119 will become larger. At this time, the position of the water guide sleeve 114 on the insulation sleeve 113 can be adjusted, and the symmetrical ribs 119 are connected by bolts.

[0032] Specifically, refer to Figure 1 A first reducing tee 103 and a second reducing tee 104 are sleeved on the outer wall of the first galvanized steel pipe 120. The first reducing tee 103 and the second reducing tee 104 are used to install the water inlet pipe 105 and the optical solder joint 106 on the first galvanized steel pipe 120. The optical solder joint 106 can detect the water temperature in the outer pipe 101. The water inlet pipe 105 is connected to the first reducing tee 103, and the optical solder joint 106 is installed at one end of the second reducing tee 104.

[0033] Specifically, refer to Figure 1 The top of the second galvanized steel pipe 121 is connected with a water outlet pipe 122, and the water outlet pipe 122 is used to connect to the heat exchange station on the ground.

[0034] In this embodiment, the heat exchange medium enters the area between the inner tube 102 and the outer tube 101 through the water inlet pipe 105, and after being guided by the inclined surface of one side of the water guide jacket 114, it will flow to both sides to reduce the impact on the inner tube 102. During the downward movement, it will produce heat exchange with the geothermal rock formation, and then enter the inner tube 102 from the bottom of the inner tube 102, and finally flow out from the water outlet pipe 122 at the top for use in the heat exchange station.

[0035] When installing the inner tube 102 and the outer tube 101, the inner tube 102 is first sleeved in the outer tube 101. When the upper flange 107 moves downward, the tapered sleeve 110 will come into contact with the bevel ring 109 to keep it centered. At this time, it is only necessary to rotate the upper flange 107 so that the bolt holes between the upper flange 107 and the lower flange 108 are aligned to facilitate the installation of the bolts and keep the bevel of the water guide sleeve 114 facing the water inlet pipe 105.

[0036] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the protection scope required by the present invention.

Claims

1. A coaxial casing heat exchange device for a mid-layer geothermal well, comprising an outer tube (101) and an inner tube (102) sleeved inside the outer tube (101), characterized in that: The top of the outer tube (101) is connected to a first galvanized steel tube (120), the first galvanized steel tube (120) is connected to a water inlet pipe (105), the top of the inner tube (102) is connected to a second galvanized steel tube (121), an upper flange (107) is connected to the outer wall of the second galvanized steel tube (121), the top of the first galvanized steel tube (120) is connected to a lower flange (108), and the upper flange (107) and the lower flange (108) are connected by bolts; The inner annular surface of the lower flange (108) is connected to a bevel ring (109), the bottom of the upper flange (107) is connected to a conical sleeve (110) capable of contacting the bevel ring (109), the top outer annular surface of the conical sleeve (110) is provided with an extrusion portion (111) corresponding to the bevel of the bevel ring (109), and a sealing rubber ring (112) is provided in the extrusion portion (111); The bottom of the conical sleeve (110) is connected to a heat insulating sleeve (113), the heat insulating sleeve (113) is sleeved on the outer wall of the second galvanized steel pipe (121) and the inner pipe (102), the outer ring surface of the heat insulating sleeve (113) is slidably connected to a water guide sleeve (114) up and down, one end of the water guide sleeve (114) is provided with a water guide slope, and the water guide slope is arranged toward the water inlet pipe (105); A fixing strip (115) penetrating the water guide sleeve (114) is arranged on the side of the heat insulation sleeve (113) close to the water inlet pipe (105), the surface of the fixing strip (115) is evenly distributed with threaded holes, and symmetrical positioning blocks (116) are connected to the outer wall of the fixing strip (115) by bolts, and the positioning blocks (116) are symmetrically located at the upper and lower ends of the water guide sleeve (114), and a protrusion (117) is arranged on the side of the positioning block (116) close to the water guide sleeve (114), and grooves (118) corresponding to the protrusions (117) are arranged on the upper and lower sides of the water guide sleeve (114).

2. The coaxial casing heat exchange device for a mid-layer geothermal well according to claim 1, characterized in that: The water guide sleeve (114) is opened on one side away from the water inlet pipe (105), and ribs (119) are symmetrically arranged on both sides, and the symmetrical ribs (119) are connected by bolts.

3. The coaxial casing heat exchange device for a mid-layer geothermal well according to claim 2, characterized in that: A first reducing tee (103) and a second reducing tee (104) are sleeved on the outer wall of the first galvanized steel pipe (120); the water inlet pipe (105) is connected to the first reducing tee (103); and a light soldering iron (106) is installed at one end of the second reducing tee (104).

4. The coaxial casing heat exchange device for a mid-layer geothermal well according to claim 3, characterized in that: The top of the second galvanized steel pipe (121) is connected to a water outlet pipe (122).

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