Coaxial double-channel heat exchange sleeve

Abstract

The invention relates to the technical field of heat exchangers, in particular to a coaxial double-channel heat exchange sleeve which is characterized in that two outer pipes are mounted in a mutually overlaid manner, each outer pipe is composed of a plurality of bent sections with two inclined sides and a horizontal section in the middle, the whole outer pipe is arranged in a spiral winding rising state, and connectors are arranged at the upper ends and the lower ends of the two outer pipes respectively; the interiors of the two outer pipes are coaxially connected with inner pipes along the paths of the outer pipes correspondingly. The middle of the inner pipe of each horizontal section is connected with a spiral channel, the middle of each spiral channel is separated through a supporting ring block, each horizontal section and the corresponding supporting ring block are each connected with a medium guiding component, and the medium guiding components guide media in the gap between the outer pipe and the inner pipe in a spiral advancing mode. The contact area of heat exchange is increased by matching with the contact with the spiral channel; according to the invention, through a double helix and self-adaptive adjustment composite means, flow and a thermal boundary layer are destroyed, so that medium distribution and heat exchange are more uniform, and the overall heat exchange coefficient and efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, specifically to a coaxial dual-channel heat exchange sleeve. Background Technology

[0002] As the core functional component of shell-and-tube heat exchangers, heat exchanger sleeves are essential components in many fields such as industrial processes, HVAC, refrigeration and heating, chemical waste heat recovery, and new energy thermal management. They are crucial for achieving heat transfer between hot and cold media and improving the overall efficiency of thermal energy utilization. Their structural design directly determines the heat exchange efficiency, operational stability, spatial adaptability, and service life of the heat exchanger, making them one of the core research directions in the field of heat exchange equipment development.

[0003] Coaxial dual-channel heat exchanger sleeves refer to a structure in which the inner and outer tubes are coaxially nested. The coaxial nested sleeve structure separates and forms two independent, non-mixing fluid flow channels. Two types of heat exchange media at different temperatures can flow in the two coaxially arranged channels, achieving efficient heat transfer through the intermediate tube wall. Compared with the conventional single-channel sleeve structure, the coaxial dual-channel design can achieve synchronous heat exchange of two media in a smaller installation space. It features a compact structure, high pipeline integration, and convenient installation and maintenance, making it an important research and application direction in the field of compact, highly integrated heat exchangers.

[0004] Currently, existing coaxial heat exchanger tubes still have many technical defects in their structural design in practical engineering applications. Uneven heat exchange is the most critical technical problem, which seriously restricts the heat exchange performance, operational reliability and application scenarios of the heat exchanger tubes.

[0005] The existing coaxial dual-channel heat exchanger jacket has an inherent flaw in its flow channel structure design. Most products simply divide the flow into a central direct current channel and an annular direct current channel using a coaxial jacket without optimizing the fluid flow pattern within the channels. When the hot and cold media flow in the corresponding channels, the laminar flow ratio is too high and the fluid velocity distribution is severely uneven. This results in uneven heat exchange throughout the jacket, leading to insufficient heat exchange in some areas, ineffective utilization of the medium's thermal energy, and extreme phenomena such as heat saturation and stagnation of heat transfer efficiency in other areas. This significantly reduces the overall heat exchange efficiency of the jacket.

[0006] For example, the prior art discloses a coaxial tube heat exchanger, in which the outer wall of the inner tube has a smooth surface or is provided with straight fins. The fluid in the annular flow channel is basically in axial laminar flow, which easily forms a thick thermal boundary layer, resulting in limited improvement in heat exchange efficiency and poor uniformity.

[0007] The present invention aims to solve such technical problems. Summary of the Invention

[0008] The purpose of this invention is to provide a coaxial dual-channel heat exchanger sleeve to solve the problems mentioned in the background art, such as the excessively high laminar flow ratio and severely uneven fluid velocity distribution in existing coaxial dual-channel heat exchanger sleeves during medium flow. This results in uneven heat exchange throughout the sleeve, insufficient heat exchange in local areas, and ineffective utilization of medium thermal energy, ultimately reducing the overall heat exchange efficiency of the sleeve.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a coaxial dual-channel heat exchange sleeve, comprising: Two outer tubes are installed on top of each other. The outer tubes are composed of multiple curved sections with inclined sides and a horizontal section in the middle. The entire outer tube is set in a spiral winding upward state. Connectors are set at the upper and lower ends of the two outer tubes respectively. The inner tubes are coaxially connected to the interior of the two outer tubes along their own paths. Each horizontal section has a spiral channel connected to the middle of the inner tube, and the spiral channel is separated by a support ring block. A medium guiding component is connected to each horizontal section and the support ring block. The medium guiding component guides the medium in the gap between the outer tube and the inner tube in a spiral manner, and increases the contact area for heat exchange by contacting the spiral channel.

[0010] As a further improvement to the above solution, the medium guiding component includes an outer connecting ring coaxially connected to the inner wall of the outer tube. The outer connecting ring is provided with a guide platform whose inner diameter gradually decreases from the outside to the inside in the direction of medium input. The inner wall of the guide platform is provided with an annular sliding groove, and is rotatably connected to the bearing seat through the sliding groove. It also includes an inner mounting ring block that is rotatably connected to the outer wall of the inner tube. The inner mounting ring block and the bearing seat are rotatably connected to the medium guide housing through a rotatable connection fulcrum. There are multiple medium guide housings that move evenly between the bearing seat and the inner mounting ring block. The medium guide housing has a bend at the end where the medium enters, which bends towards the middle of the inner tube.

[0011] As a further improvement to the above scheme, an arc-shaped connecting seat is extended and coaxially fixedly connected to the side of the bearing housing away from the guide table, and the inner diameter of the arc-shaped connecting seat gradually increases from the medium conveying direction. The outer slope of the arc-shaped connector is provided with several oblique slots evenly spaced in sequence. The number of oblique slots is consistent with the number of medium guiding shells, and their positions match.

[0012] As a further improvement to the above scheme, a horizontal movable groove is provided at the top of the tail end of each medium guiding shell. The extension direction of the movable groove is consistent with the flow direction of the medium inside the medium guiding shell. A slider is slidably connected to the movable groove at a relatively horizontal position. A cylinder with a hollow center is fixedly connected to the top of the slider. An outer sliding cylinder is vertically slidably connected to the outer wall of the cylinder. The outer sliding cylinder is connected to the cylinder by a contraction spring. An outer sliding connecting block is fixedly connected to the top of the outer sliding cylinder. Each outer sliding connecting block slides in the corresponding inclined groove. The inclined direction of the slanted slot is consistent with the spiral direction of the spiral channel, which is used to guide the medium and guide the housing to conform to the direction of the spiral channel and achieve the change of angle.

[0013] As a further improvement to the above scheme, the angle between the centerline of the medium guiding shell and the inner tube is in the range of 15° to 65°. The included angle refers to the angle between the central axis of symmetry of the medium guiding shell and the centerline of the inner tube.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention uses a combination of double spirals and adaptive adjustment to disrupt the flow and thermal boundary layer, making the medium distribution and heat exchange more uniform, thereby improving the overall heat transfer coefficient and efficiency. Specifically, the spiral channels on the outer and inner walls of the outer tube constitute the first macroscopic spiral flow channel, and the medium guides the medium to generate a swirling flow in the same direction as the spiral channel through the medium guide component, constituting the second microscopic active guidance. This allows the angle of the medium guide shell to be automatically adjusted by the cooperation of centrifugal force and spring when the medium flow rate changes, thereby changing the flow resistance and achieving flow rate self-adaptation.

[0015] 2. This invention, through a unique Venturi effect inlet and a rotating adjustable flow guide structure, enhances heat transfer while simultaneously increasing flow velocity in low-velocity regions and suppressing resistance in high-velocity regions. It optimizes the flow resistance distribution along the flow path. The guide platform at the inlet of the medium guide component is designed with a gradually narrowing inner diameter, utilizing the Venturi effect to increase the medium velocity at the inlet, thereby enhancing the turbulence and heat transfer intensity in this local area. Furthermore, when the medium velocity is too high, the rotating medium guide shell, under the action of centrifugal force, increases the angle with the inner tube, forming greater flow resistance and actively suppressing the flow velocity, preventing insufficient heat transfer due to excessively high flow rates.

[0016] 3. This invention, through the linkage design of the guide platform, the rotatable bearing seat and the medium guiding shell, converts part of the axial flow kinetic energy of the medium into mechanical energy to drive the rotation of the flow guiding component, thereby driving the flow guiding structure to generate a swirling guiding effect on the subsequent fluid, forming an enhanced "flow-rotation-guidance" loop, which effectively improves the reliability and economy of the system.

[0017] 4. This invention, through its compact layout of double outer tubes spirally stacked and wound, greatly increases the effective heat exchange area within a limited space and facilitates modular installation and system integration.

[0018] 5. This invention strictly follows the coaxial dual-channel design, utilizing the gap between the inner and outer tubes and the channels inside the inner tube to achieve complete physical isolation between the two heat exchange media, fundamentally eliminating the risk of cross-contamination between the media. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the outer tube in the mating state of the present invention.

[0020] Figure 2 This is a schematic diagram of the overall structure of the inner tube of the present invention.

[0021] Figure 3 This is a schematic cross-sectional view of the gap between the inner and outer tube horizontal sections of the present invention.

[0022] Figure 4 This is a schematic diagram showing the engagement state of the medium guiding component and the spiral channel of the present invention.

[0023] Figure 5 This is a schematic cross-sectional view of the spiral channel of the present invention.

[0024] Figure 6 This is a schematic cross-sectional view of the overall structure of the medium guiding component of the present invention.

[0025] Figure 7 For the present invention Figure 6 A front view of the medium flowing in the direction of the tail.

[0026] Figure 8 For the present invention Figure 6 Side view of the medium flow direction.

[0027] Figure 9 This is a schematic cross-sectional view of the medium guiding shell in this invention.

[0028] Figure 10 For the present invention Figure 9 A magnified schematic diagram of the structure at point a.

[0029] In the diagram: 1. Outer tube; 11. Inner tube; 12. Spiral channel; 13. Support ring block; 2. Outer connecting ring; 21. Bearing seat; 22. Guide platform; 23. Inner mounting ring block; 24. Rotary connection fulcrum; 25. Medium guiding shell; 26. Bend; 27. Movable slide groove; 28. Slider; 29. ​​Outer slide cylinder; 210. Outer sliding connecting block; 211. Contraction spring; 212. Arc-shaped connecting seat; 213. Angled groove. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] See Figures 1-10 .

[0032] This invention provides a coaxial dual-channel heat exchanger sleeve, comprising: Two outer tubes 1 are installed on top of each other. The outer tube 1 is composed of multiple curved sections with inclined sides and a horizontal section in the middle. The entire outer tube 1 is set in a spiral winding upward state. Connectors are set at the upper and lower ends of the two outer tubes 1 respectively. The inner tubes 11 are coaxially connected to the inside of the two outer tubes 1 along their own paths. Each horizontal section of the inner tube 11 is connected to a spiral channel 12 in the middle, and the spiral channel 12 is separated by a support ring block 13. A medium guiding component is connected to each horizontal section and the support ring block 13. The medium guiding component guides the medium in the gap between the outer tube 1 and the inner tube 11 in a spiral manner, and increases the contact area for heat exchange by contacting the spiral channel 12.

[0033] See Figure 1 The two outer tubes 1 are installed together by their own spiral arrangement, so as to achieve heat exchange. The outer tubes 1 and inner tube 11 are arranged to avoid direct interaction of the medium and avoid unnecessary pollution.

[0034] Additional information on media: Media can generally be categorized into the following types, and their selection follows the principles of "high efficiency, security, and system adaptability": a. Working fluids that undergo phase change (most commonly found in refrigeration and heat pump systems): Freon refrigerants (such as R134a, R410A, R32, etc.): This is a very mainstream design in small to medium-sized commercial air conditioners and heat pump water heaters. Because the annular gap space is relatively narrow, it is beneficial to improve the refrigerant flow rate and heat transfer coefficient, and the sheath structure has good pressure resistance.

[0035] b. Other phase change working fluids: such as ammonia (large-scale industrial refrigeration), carbon dioxide (transcritical cycle), etc.

[0036] c. Liquids that do not undergo a phase change (most commonly seen in water-to-water heat exchange, liquid-to-liquid heat exchange, and ground source heat pumps): Water: cooling water, chilled water, hot water.

[0037] Antifreeze / salt water: ethylene glycol aqueous solution, calcium chloride solution, etc., for environments that may be below 0°C (such as ground source heat pumps in extremely cold regions).

[0038] Heat transfer oil and process fluids: used for heat exchange within specific temperature ranges in industries such as chemical and petroleum.

[0039] d. Gas: Air, flue gas, etc. However, the heat transfer coefficient of gases is low, and strengthening measures such as significantly increasing fins are usually required. Therefore, their application in coaxial sleeves is relatively rare, and they are more commonly found in finned tube heat exchangers.

[0040] See Figure 2 , Figure 4 Further explanation is needed regarding the spiral channel 12 and the medium guiding component. The spiral channel 12 is a raised rib or groove formed on the outer wall of the inner tube 11, extending spirally along the inner tube axis. Its spiral extension direction can be set as needed, and the medium guiding component guides the medium to be consistent with the twisting direction of the spiral channel 12 during transportation, which greatly increases the contact area between the medium and the inner tube 11, thereby improving the heat exchange effect of the medium on the inner tube 11.

[0041] The medium guiding component includes an outer connecting ring 2 coaxially connected to the inner wall of the outer tube 1. The outer connecting ring 2 is provided with a guide platform 22 with an inner diameter that gradually decreases from the outside to the inside in the direction of medium input. The inner wall of the guide platform 22 is provided with an annular sliding groove, and is rotatably connected to the bearing seat 21 through the sliding groove.

[0042] See Figure 8 The black arrow indicates the direction of medium transport from the inner tube 11. During transport, the medium will first contact the inner wall of the guide platform 22 and, after a change in flow velocity, continue to be transported along the gap between the outer tube 1 and the inner tube 11. Secondly, the outer connecting ring 2 and the bearing seat 21 are rotatably connected, so that after the medium is accelerated by the guide platform 22, it impacts the medium guide housing 25, which is tilted at a certain angle. The force generated can drive the bearing seat 21 and the medium guide housing 25 to rotate, thereby enabling the subsequent medium to obtain tangential velocity and flow more evenly along the spiral channel 12, which can effectively avoid uneven heat exchange.

[0043] Specifically, this is the Venturi effect: in a smoothly contracting flow channel, the flow velocity increases significantly as the flow area decreases, while the static pressure decreases simultaneously. Its underlying principle follows the fluid continuity equation and Bernoulli's equation, which causes the flow velocity to increase when the medium is guided by the guide platform 22 and to continue to be transported along the medium guiding component.

[0044] It is important to note that different fluid media exhibit fundamentally different behaviors, requiring case-by-case analysis.

[0045] It should be noted that the above does not include special variations under extreme operating conditions.

[0046] It also includes an inner mounting ring block 23 rotatably connected to the outer wall of the inner tube 11. The inner mounting ring block 23 and the bearing seat 21 are rotatably connected to the medium guide housing 25 through a rotatable connection fulcrum 24. There are multiple medium guide housings 25 that move evenly between the bearing seat 21 and the inner mounting ring block 23. The medium guide housing 25 has a bend 26 at the end where the medium enters, which bends and guides the medium towards the middle of the inner tube 11.

[0047] See Figure 6 and Figure 7 The inner mounting ring 23 is rotatably connected to the currently contacting inner tube 11, which can provide a stable connection for the medium guiding shell 25 and ensure that multiple medium guiding shells 25 can synchronously generate corresponding adaptive offsets under different medium flow rates. If the flow rate is too high, it will further push the tilt angle of multiple medium guiding shells 25, which will increase the resistance when the medium enters, thus avoiding the situation where the heat exchange efficiency is reduced and the heat exchange is uneven due to the excessive flow rate.

[0048] The bearing housing 21 extends away from the guide platform 22 and is coaxially fixedly connected to an arc-shaped connecting seat 212. The inner diameter of the arc-shaped connecting seat 212 gradually increases from the medium conveying direction. Several inclined slots 213 are evenly opened on the outer inclined surface of the arc-shaped connecting seat 212. The number of inclined slots 213 is consistent with the number of medium guiding housings 25, and their positions match.

[0049] See Figures 6-8 The arc-shaped connecting seat 212 is installed at the end of the entire medium conveying direction. Since the arc-shaped connecting seat 212 is connected to the extended bearing seat 21, the arc-shaped connecting seat 212 will rotate synchronously with the rotation of the bearing seat 21 during medium conveying. This ensures the consistency of the relative position between the medium guide housing 25 and the arc-shaped connecting seat 212 when the angle changes. This provides the conditions for the medium guide housing 25 to synchronously change its angle with the change of medium flow rate. Specifically, the slower the medium flow rate, the smaller the angle between the entire medium guide housing 25 and the center line of the inner tube 11, but it must be at least 15°. Specifically, the angle refers to the angle between the central axis of symmetry of the medium guide housing 25 and the center line of the inner tube 11. The faster the medium flow rate, the more the medium guide housing 25 will connect with the arc-shaped connecting seat 212, gradually increasing the angle between the medium guide housing 25 and the center line of the inner tube 11. This generates greater resistance to the flowing medium, reducing the excessively fast medium flow rate and achieving an adaptive flow rate adjustment function.

[0050] It should be further noted that the elastic force of the multiple media guiding components installed sequentially along the media conveying direction at the gap between the outer tube 1 and the inner tube 11 gradually decreases.

[0051] Each medium guiding housing 25 has a horizontal movable groove 27 at its tail end. The movable groove 27 extends in the same direction as the medium flow direction inside the medium guiding housing 25. A slider 28 is slidably connected to the movable groove 27 in a horizontal direction. A hollow cylinder is fixedly connected to the top of the slider 28.

[0052] An outer sliding cylinder 29 is vertically slidably connected to the outer wall of the cylinder. The outer sliding cylinder 29 is connected to the cylinder by a contraction spring 211. An outer sliding connecting block 210 is fixedly connected to the top of the outer sliding cylinder 29. Each outer sliding connecting block 210 slides within a corresponding inclined slot 213.

[0053] See Figure 9 and Figure 10 The retraction spring 211 here is an elastic workpiece. The purpose of its gradually decreasing elastic force is that, as the medium is gradually transported, if the elastic force of the first elastic workpiece that comes into contact with the medium is too small, it will cause the center lines of multiple medium guide housings 25 and inner tube 11 to be at the largest angle when the medium enters. At this time, the resistance of the medium will be too large, affecting the flow rate of the medium in the subsequent conveying pipeline. Therefore, the elastic force of the first elastic workpiece needs to be relatively large, so as to ensure that the guiding function is achieved, while also making the angle between the center lines of the medium guide housing 25 and inner tube 11 small, avoiding large resistance when the medium enters, and avoiding vibration and other problems that affect the service life of the equipment when the resistance is too large.

[0054] The inclined orientation of the slanted slot 213 is consistent with the spiral orientation of the spiral channel 12, which is used to guide the medium and guide the housing 25 to conform to the orientation of the spiral channel 12 and realize the change of angle.

[0055] See Figure 4 The twisting direction of the spiral channel 12 is consistent with the orientation of the multiple medium guide housings 25, which can all be clockwise or counterclockwise.

[0056] Further explanation is needed regarding the aforementioned angle change of the medium guiding housing 25. Since the medium guiding housing 25 is slidably connected by the outer sliding connecting block 210 with the inclined slot 213 that always matches itself under the elastic expansion and contraction, and the inner diameter of the arc-shaped connecting seat 212 gradually increases with the direction of medium flow, when the outer sliding connecting block 210 slides along the inclined slot 213, it can drive the medium guiding housing 25 to change its angle, and limit the minimum / maximum included angle between the medium guiding housing 25 and the center line of the inner tube 11.

[0057] Specifically, when the outer sliding connecting block 210 slides along the inclined slot 213, it pulls the medium guiding housing 25 to rotate in the specified direction with the rotating connecting fulcrum 24 as the rotation fulcrum. That is, under the thrust of medium transportation, the angle between the medium guiding housing 25 and the center line of the inner tube 11 can be increased.

[0058] Furthermore, as multiple medium guiding shells 25 drive the outer sliding connecting block 210 to rotate synchronously, centrifugal force intervenes. When the bearing seat 21 rotates too fast and drives the medium guiding shell 25 to rotate, causing the centrifugal force to increase, the centrifugal force will push the outer sliding connecting block 210 to slide outward along the inclined slot 213 and towards the arc-shaped connecting seat 212, thereby increasing the angle between the medium guiding shell 25 and the center line of the inner tube 11, which will increase the resistance to the medium, ultimately reducing the medium flow rate and ensuring the effectiveness and uniformity of the heat exchange process.

[0059] The angle between the centerline of the medium guiding housing 25 and the centerline of the inner tube 11 is in the range of 15° to 65°.

[0060] In use, the present invention utilizes a connector to complete the connection of the heat exchange sleeve, and then the delivery of the medium can be controlled to carry out heat exchange operations.

[0061] During heat exchange, the medium flows through the gap between the outer tube 1 and the inner tube 11 and is guided by the guide platform 22 through the guide ports formed by the cooperation of multiple medium guide shells 25. Due to the consistent elasticity of the contraction springs 211 in each medium guide component, the medium will flow to another location along the medium guide shell 25 and the guide ports formed by two adjacent components. When the medium flows and is transported, the entire bearing housing 21 will rotate synchronously under the obstruction of the medium guide shell 25 which is inclined at a certain angle. As the bearing housing 21 rotates, the medium will eventually flow spirally toward the spiral channel 12 under the guidance of centrifugal force and the bend 26. Due to the twisted setting of the spiral channel 12, the contact area of ​​heat exchange can be further expanded, thereby improving the heat exchange effect.

[0062] Furthermore, as the medium conveying speed varies, multiple medium guide housings 25 will generate centrifugal force as they rotate, and rely on the inclined slots 213 opened on the fitting arc-shaped connecting seat 212 to drive multiple medium guide housings 25 to shift synchronously, and increase the angle with the center line of the inner tube 11, forcibly reducing the medium conveying speed to ensure the efficiency of heat exchange.

[0063] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A coaxial dual-channel heat exchanger jacket, characterized in that, include: Two outer tubes are installed on top of each other. The outer tubes are composed of multiple curved sections with inclined sides and a horizontal section in the middle. The entire outer tube is set in a spiral winding upward state. Connectors are set at the upper and lower ends of the two outer tubes respectively. The inner tubes are coaxially connected to the interior of the two outer tubes along their own paths. Each horizontal section has a spiral channel connected to the middle of the inner tube, and the spiral channel is separated by a support ring block. A medium guiding component is connected to each horizontal section and the support ring block. The medium guiding component guides the medium in the gap between the outer tube and the inner tube in a spiral manner, and increases the contact area for heat exchange by contacting the spiral channel. The medium guiding component includes an outer connecting ring coaxially connected to the inner wall of the outer tube. The outer connecting ring is provided with a guide platform whose inner diameter gradually decreases from the outside to the inside in the direction of medium input. The inner wall of the guide platform is provided with an annular sliding groove, and is rotatably connected to the bearing seat through the sliding groove. The medium guiding component also includes an inner mounting ring block rotatably connected to the outer wall of the inner tube. The inner mounting ring block and the bearing seat are both rotatably connected to the medium guiding housing through a rotatable fulcrum.

2. The coaxial dual-channel heat exchanger sleeve according to claim 1, characterized in that: The medium guiding housing consists of multiple housings that move uniformly between the bearing housing and the inner mounting ring block.

3. A coaxial dual-channel heat exchanger sleeve according to claim 2, characterized in that: The medium guiding shell has a bend at the end where the medium enters, which bends towards the middle of the inner tube.

4. A coaxial dual-channel heat exchanger sleeve according to claim 2, characterized in that: The bearing housing extends away from the guide table and is coaxially fixedly connected to an arc-shaped connecting seat, the inner diameter of which gradually increases from the direction of medium conveying.

5. A coaxial dual-channel heat exchanger sleeve according to claim 4, characterized in that: The outer slope of the arc-shaped connector is provided with a number of oblique slots evenly spaced in sequence. The number of oblique slots is the same as the number of medium guiding shells, and their positions are matched.

6. A coaxial dual-channel heat exchanger sleeve according to claim 5, characterized in that: Each of the media guiding housings has a horizontal movable groove at its tail end. The movable groove extends in the same direction as the flow direction of the medium inside the media guiding housing. A slider is slidably connected to the movable groove in a relatively horizontal manner. A cylinder with a hollow center is fixedly connected to the top of the slider.

7. A coaxial dual-channel heat exchanger sleeve according to claim 6, characterized in that: An outer sliding cylinder is vertically slidably connected to the outer wall of the cylinder. The outer sliding cylinder is connected to the cylinder by a contraction spring. An outer sliding connecting block is fixedly connected to the top of the outer sliding cylinder. Each outer sliding connecting block slides in a corresponding inclined groove.

8. A coaxial dual-channel heat exchanger sleeve according to claim 7, characterized in that: The inclined groove is aligned with the spiral direction of the spiral channel, which guides the medium and the housing to conform to the direction of the spiral channel and achieves angle changes.

9. A coaxial dual-channel heat exchanger sleeve according to claim 8, characterized in that: The angle between the centerline of the medium guiding shell and the centerline of the inner tube is in the range of 15° to 65°. The included angle refers to the angle between the central axis of symmetry of the medium guiding shell and the centerline of the inner tube.

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