A type of coaxial carbon dioxide gas cooler with an inner tube of a twisted four-leaf tube.

Abstract

This utility model relates to the field of transcritical CO2 heat pump technology and discloses a coaxial carbon dioxide gas cooler with a twisted four-leaf tube as the inner tube. It includes a load-bearing plate, with a heat transfer mechanism installed at the outer top of the load-bearing plate to improve heat transfer efficiency. Multiple damping mechanisms are installed on the top of the outer wall of the load-bearing plate to dampen the heat transfer mechanism. The heat transfer mechanism includes a twisted four-leaf tube installed at the outer top of the load-bearing plate. In this utility model, the spiral twisted four-leaf structure of the inner tube solves the problem of low heat exchange efficiency in traditional gas coolers. It promotes better boundary layer disruption during fluid flow inside and outside the tube. By adjusting the pitch ratio of the twisted four-leaf tube and the inner-outer tube diameter ratio, it can achieve better compatibility with transcritical CO2 high-temperature heat pump systems, significantly improving the overall heat exchange performance of the gas cooler.

Description

Technical Field

[0001] This utility model relates to the field of transcritical CO2 heat pump technology, and in particular to a shell-and-tube type carbon dioxide gas cooler with an inner tube that is a twisted four-leaf tube. Background Technology

[0002] The shell-and-tube carbon dioxide gas cooler is a highly efficient heat exchange device. Its core structure consists of nested inner and outer tubes, forming a dual flow path of annular channel and inner tube channel. During operation, the carbon dioxide gas to be cooled flows in the inner tube or annular gap, while the cooling water flows in the opposite direction in the other channel. Heat exchange is achieved through the tube walls, which lowers the temperature of the carbon dioxide gas and meets the needs of cooling, liquefaction or condensation in refrigeration cycles and industrial production scenarios. Due to its compact structure, large heat exchange area and convenient disassembly and maintenance, this device is widely used in food refrigeration, chemical reaction and energy recovery fields, and can effectively improve the thermodynamic properties of carbon dioxide in different process stages.

[0003] Existing coaxial CO2 gas coolers condense CO2 gas using hollow straight tubes. However, the uniform internal space arrangement of the hollow straight tubes results in poor temperature uniformity during the counter-flow of hot and cold media, leading to insufficient heat exchange between CO2 and the cooling medium. Current technologies increase the heat exchange area by connecting multiple hollow straight tubes together and adding curved hollow tubes on both sides, but the straight tube structure cannot effectively disrupt the boundary layer, resulting in insufficient heat exchange. Hollow straight tubes are bulky and heavy, resulting in insufficient heat exchange per unit volume. The fluid dynamics inside the straight tubes are poor, making it difficult for the fluid to undergo vortex-like heat transfer enhancement phenomena during flow. Poor temperature matching prevents effective utilization of the unique physical property changes of transcritical CO2. These shortcomings make it difficult to meet the requirements of modern high-efficiency, compact transcritical CO2 heat pump systems. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a sleeve-type carbon dioxide gas cooler with a twisted four-leaf tube as the inner tube. It aims to improve the existing technology where straight tube structures cannot effectively break the boundary layer, resulting in insufficient heat exchange; hollow straight tubes are bulky and heavy, resulting in insufficient heat exchange per unit volume; the fluid dynamics inside the straight tube are poor, and the fluid inside the tube is not prone to heat exchange enhancement phenomena similar to eddies during flow; and the temperature matching is poor, which cannot effectively utilize the special physical property changes of transcritical CO2.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a sleeve-type carbon dioxide gas cooler with an inner tube of a twisted four-leaf tube, comprising a load-bearing plate, wherein a heat transfer mechanism is installed at the outer top of the load-bearing plate to improve heat transfer efficiency, and multiple damping mechanisms are installed at the top of the outer wall of the load-bearing plate, wherein the multiple damping mechanisms are used to dampen the heat transfer mechanism; the heat transfer mechanism comprises a twisted four-leaf tube, wherein the twisted four-leaf tube is installed at the outer top of the load-bearing plate, and smooth four-leaf tubes are fixedly connected to the left and right ends of the outer wall of the twisted four-leaf tube, and an outer sleeve is installed on the outer side of the twisted four-leaf tube.

[0006] As a further description of the above technical solution:

[0007] Each of the aforementioned shock-absorbing mechanisms includes a fixed ring, which is installed on the top of the outer wall of the load-bearing plate. A shock absorber is fixedly connected to the bottom of the outer wall of the fixed ring. A fixed plate is fixedly connected to the left and right ends of the bottom of the outer wall of the shock absorber. The bottom of the outer walls of the multiple fixed plates is fixedly connected to the top of the outer wall of the load-bearing plate. A support frame is fixedly connected to the front and rear sides of the upper middle part of the outer wall of the fixed ring. A long rod frame is installed inside the multiple support frames. A rotating block is fixedly connected to the left and right sides of the bottom end of the long rod frame. A rotating shaft is fixedly connected to the bottom of the outer wall of the multiple rotating blocks. A rotating base is installed on the outer wall of the rotating shaft. The interior of the rotating base is rotatably connected to the outer wall of the rotating shaft.

[0008] As a further description of the above technical solution:

[0009] Each of the four corners at the bottom of the load-bearing plate is fixedly connected to a load-bearing column, and each of the load-bearing columns is fixedly connected to a foot pad at the bottom of its outer wall.

[0010] As a further description of the above technical solution:

[0011] The outer sleeve has a sealing ring installed on both the left and right sides of its outer wall. The middle part of the sealing ring is fixedly connected to the outer wall of the smooth four-leaf tube. A sealing ring is fixedly connected to the outer wall of the sealing ring, and the other end of the outer wall of the sealing ring is fixedly connected to the outer wall of the outer sleeve.

[0012] As a further description of the above technical solution:

[0013] A pressure sensor is installed at the top of the outer sleeve, and a pressure gauge is fixedly connected to the top of the pressure sensor.

[0014] As a further description of the above technical solution:

[0015] Water supply pipes are fixedly connected to the top left and right sides of the outer wall of the outer sleeve, and fixing plates are fixedly connected to the top of the outer walls of the multiple water supply pipes.

[0016] As a further description of the above technical solution:

[0017] A water supply valve is installed on the top of the outer wall of the fixed plate. Multiple bolts are threaded at equal intervals at the bottom of the water supply valve, and a turntable is installed at the front end of the water supply valve.

[0018] As a further description of the above technical solution:

[0019] The top of the fixing plate has multiple bolt grooves at equal intervals, and the inside of the bolt grooves is threaded to the outer wall of the bolt.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, the spiral twisted four-leaf structure of the inner tube solves the problem of low heat exchange efficiency of traditional air coolers. It can better disrupt the boundary layer when the fluid flows inside and outside the tube. At the same time, due to the special structure, it is easier to generate secondary flow, which effectively improves the heat exchange efficiency. By adjusting the pitch ratio of the twisted four-leaf tube and the inner and outer tube diameter ratio, it can be better adapted to the transcritical CO2 high-temperature heat pump system, significantly improving the overall heat exchange performance of the air cooler.

[0022] 2. In this utility model, when the fixed ring is subjected to pressure and vibration, the shock absorber at its bottom deforms to absorb the vibration energy. The fixed plate provides fixed support for the shock absorber, stably installing the shock absorber on the load-bearing plate. At the same time, the support frame in the upper part of the fixed ring allows the long rod frame to rotate. The rotating block at the bottom of the long rod frame can rotate in the rotating base through the rotating shaft. The buffering part of the vibration force realizes the shock absorption protection of the equipment, ensuring that the equipment remains stable during operation. Attached Figure Description

[0023] Figure 1 This is a front view of a sleeve-type carbon dioxide gas cooler with a twisted four-leaf tube as the inner tube, as proposed in this utility model.

[0024] Figure 2 This is a perspective view of a sleeve-type carbon dioxide gas cooler with a twisted four-leaf tube as the inner tube proposed in this utility model.

[0025] Figure 3 This is a partial structural exploded view of a sleeve-type carbon dioxide gas cooler with a twisted four-leaf tube as the inner tube proposed in this utility model.

[0026] Figure 4 for Figure 3 Enlarged view at point A;

[0027] Figure 5 This is a diagram illustrating the heat transfer mechanism of a sleeve-type carbon dioxide gas cooler with a twisted four-leaf tube as the inner tube, as proposed in this utility model.

[0028] Figure 6 This is a schematic diagram of the shock-absorbing mechanism of a sleeve-type carbon dioxide gas cooler with a twisted four-leaf tube as the inner tube, as proposed in this utility model.

[0029] Figure 7 This is a partial structural breakdown diagram of the shock-absorbing mechanism of a sleeve-type carbon dioxide gas cooler with a twisted four-leaf tube as the inner tube, as proposed in this utility model.

[0030] Legend:

[0031] 1. Load-bearing plate; 2. Heat transfer mechanism; 201. Twisted four-leaf tube; 202. Smooth four-leaf tube; 203. Inner tube of four-leaf tube; 204. Outer sleeve; 3. Shock absorption mechanism; 301. Fixing ring; 302. Shock absorber; 303. Fixing plate; 304. Support frame; 305. Long rod frame; 306. Rotating block; 307. Rotating shaft; 308. Rotating base; 4. Load-bearing column; 5. Foot pad; 6. Sealing ring; 7. Sealing ring; 8. Pressure sensor; 9. Pressure gauge panel; 10. Water supply pipe; 11. Fixing plate; 12. Bolt groove; 13. Bolt; 14. Water supply valve; 15. Turntable. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Reference Figure 2 , Figure 3 and Figure 5 The present invention provides an embodiment of a sleeve-type carbon dioxide gas cooler with an inner tube of a twisted four-leaf tube, comprising a load-bearing plate 1, a heat transfer mechanism 2 installed at the outer top of the load-bearing plate 1, the heat transfer mechanism 2 being used to improve heat transfer efficiency, and multiple shock-absorbing mechanisms 3 installed at the top of the outer wall of the load-bearing plate 1, the multiple shock-absorbing mechanisms 3 being used to dampen the heat transfer mechanism 2; the heat transfer mechanism 2 includes a twisted four-leaf tube 201, the twisted four-leaf tube 201 being installed at the outer top of the load-bearing plate 1, and smooth four-leaf tubes 202 being fixedly connected to the left and right ends of the outer wall of the twisted four-leaf tube 201, and an outer sleeve 204 being installed on the outer side of the twisted four-leaf tube 201;

[0034] Specifically, both ends of the twisted four-leaf tube 201 are smooth four-leaf tubes 202. Adding a smooth four-leaf tube 202 at the beginning and end can optimize the assembly performance, fluid flow stability and structural integrity of the pipe. The twisted four-leaf tube 201 and the smooth four-leaf tube 202 together form the inner tube 203 of the four-leaf tube, while the outer sleeve 204 is a smooth straight tube. Both the inner tube 203 and the outer sleeve 204 are hollow tubes.

[0035] Reference Figure 2 , Figure 6 and Figure 7 Each of the multiple shock-absorbing mechanisms 3 includes a fixed ring 301. The multiple fixed rings 301 are installed on the top of the outer wall of the load-bearing plate 1. A shock absorber 302 is fixedly connected to the bottom of the outer wall of the fixed ring 301. A fixed plate 303 is fixedly connected to the left and right ends of the bottom of the outer wall of the shock absorber 302. The bottom of the outer wall of the multiple fixed plates 303 is fixedly connected to the top of the outer wall of the load-bearing plate 1. A support frame 304 is fixedly connected to the front and rear sides of the upper middle part of the outer wall of the fixed ring 301. A long rod frame 305 is installed inside the multiple support frames 304. A rotating block 306 is fixedly connected to the left and right sides of the bottom end of the long rod frame 305. A rotating shaft 307 is fixedly connected to the bottom of the outer wall of the multiple rotating blocks 306. A rotating base 308 is installed on the outer wall of the rotating shaft 307. The interior of the rotating base 308 is rotatably connected to the outer wall of the rotating shaft 307.

[0036] Specifically, when the heat transfer mechanism 2 operates and causes the fixed ring 301 to vibrate under pressure, the damper 302 at its bottom deforms to absorb vibration energy and reduce vibration intensity. The fixed plate 303 provides fixed support for the damper 302, stably installing the damper 302 on the load-bearing plate 1 and enhancing the stability of the damping structure. At the same time, the support frame 304 in the upper part of the fixed ring 301 allows the long rod frame 305 to rotate. The rotating block 306 at the bottom of the long rod frame 305 can rotate within the rotating base 308 via the rotating shaft 307, buffering part of the vibration force while adjusting its own position to adapt to the vibration. Since the support frame 304 is fixed to the upper end of the fixed ring 301, the two long rod frames 305 can achieve a "lifting" effect on the fixed ring 301, limiting the back-and-forth swaying of the fixed ring 301 and ensuring its stability in the front-and-back direction. The various components work together to offset vibration and disperse vibration energy through deformation and rotation, thus achieving vibration damping protection for the equipment.

[0037] Reference Figure 1 , Figure 3 and Figure 4At the four corners of the bottom of the load-bearing plate 1, load-bearing columns 4 are fixedly connected. Foot pads 5 are fixedly connected to the bottom of the outer walls of multiple load-bearing columns 4. Sealing rings 6 are installed on both the left and right sides of the outer wall of the outer sleeve 204. The middle of the sealing ring 6 is fixedly connected to the outer wall of the smooth four-leaf tube 202. A sealing ring 7 is fixedly connected to the outer wall of the sealing ring 6. The other end of the outer wall of the sealing ring 7 is fixedly connected to the outer wall of the outer sleeve 204. A pressure sensor 8 is installed at the top of the outer sleeve 204. A pressure gauge 9 is fixedly connected to the end. Water pipes 10 are fixedly connected to the top left and right sides of the outer wall of the outer sleeve 204. Fixing plates 11 are fixedly connected to the top of the outer walls of multiple water pipes 10. A water valve 14 is installed on the top of the outer wall of the fixing plate 11. Multiple bolts 13 are threaded at equal intervals at the bottom of the water valve 14. A turntable 15 is installed at the front end of the water valve 14. Multiple bolt grooves 12 are opened at equal intervals at the top of the fixing plate 11. The inside of the bolt grooves 12 is threadedly connected to the outer wall of the bolts 13.

[0038] Specifically, load-bearing columns 4 are welded to the four corners of the bottom of the load-bearing plate 1. The foot pads 5 at the bottom enhance the stability of the equipment during placement. There are sealing rings 6 on both the left and right sides of the outer wall of the outer sleeve 204. The middle of the sealing ring 6 is welded to the outer wall of the smooth four-leaf tube 202. The outer wall of the sealing ring 6 is provided with a sealing ring 7. The other end of the outer wall of the sealing ring 7 contacts the outer wall of the outer sleeve 204, which can enhance the sealing effect of the equipment. There is a pressure sensor 8 at the top of the outer sleeve 204. The pressure sensor 8 can transmit the internal operating pressure of the equipment to the pressure gauge in real time. Nine locations are shown. There are water supply pipes 10 on the top left and right sides of the outer wall of the outer sleeve 204. There are fixed plates 11 on the top of the outer wall of the multiple water supply pipes 10. There are water supply valves 14 on the top of the outer wall of the fixed plates 11. There are multiple bolts 13 at equal intervals at the bottom of the water supply valves 14. There is a turntable 15 at the front end of the water supply valves 14. Rotating the turntable 15 can adjust the opening and closing of the water supply valves 14. There are multiple bolt grooves 12 at equal intervals at the top of the fixed plates 11. The inside of the bolt grooves 12 is in contact with the outer wall of the bolts 13. All components cooperate with each other to ensure the stable operation of the equipment and the normal realization of the cooling water supply function.

[0039] Working Principle: Utilizing a twisted four-leaf tube 201, the continuous three-dimensional flow channel design disrupts the fluid boundary layer and creates swirling flow, significantly improving heat transfer efficiency. Simultaneously, each leaf of the twisted four-leaf tube 201 can independently form a vortex, achieving enhanced heat transfer. Adding a smooth four-leaf tube 202 at both ends optimizes the pipe's assembly performance, fluid flow stability, and structural integrity, reducing inlet impact and effectively guiding the fluid to gradually adapt to the four-leaf cross-section flow channel shape, reducing local inlet resistance loss and preventing outlet flow turbulence. When applied in transcritical carbon dioxide systems, this structure increases the heat transfer area per unit length, combined with optimized… The degree of twisting can control pressure drop while ensuring turbulence, thus enabling equipment miniaturization. By adjusting the pitch of the twisted four-leaf tube 201, heat exchange efficiency and pressure drop can be better balanced during operation, comprehensively improving the application value of the shell-and-tube twisted four-leaf tube air cooler. In addition, there is a corresponding ratio between the diameters of the twisted four-leaf tube 201 and the outer shell 204. Adjusting this ratio allows the combined shell-and-tube air cooler to be more adaptable to the working environment of transcritical carbon dioxide high-temperature heat pumps, effectively improving heat exchange performance. These technical means work together to systematically solve the problems of heat exchange efficiency, structural reliability, and maintenance convenience of traditional air coolers.

[0040] When the heat transfer mechanism 2 operates and causes the fixed ring 301 to vibrate under pressure, the damper 302 at its bottom deforms to absorb the vibration energy. The fixed plate 303 provides fixed support for the damper 302, stably mounting the damper 302 on the load-bearing plate 1. At the same time, the support frame 304 in the upper part of the fixed ring 301 allows the long rod frame 305 to rotate. The rotating block 306 at the bottom of the long rod frame 305 can rotate within the rotating base 308 via the rotating shaft 307. While buffering part of the vibration force, since the support frame 304 is fixed to the upper end of the fixed ring 301, the two long rod frames 305 can achieve a "lifting" effect on the fixed ring 301, ensuring its stability in the front and rear directions. The various components work together to offset the vibration through deformation and rotation, achieving shock absorption protection for the equipment and ensuring the stability of the equipment during operation.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sleeve-type carbon dioxide gas cooler with an inner tube of a twisted four-leaf tube, comprising a load-bearing plate (1), characterized in that: A heat transfer mechanism (2) is installed on the top outer side of the load-bearing plate (1). The heat transfer mechanism (2) is used to improve the heat transfer efficiency. Multiple damping mechanisms (3) are installed on the top outer wall of the load-bearing plate (1). All of the multiple damping mechanisms (3) are used to dampen the heat transfer mechanism (2). The heat transfer mechanism (2) includes a twisted four-leaf tube (201), which is installed on the outer top of the load-bearing plate (1). Smooth four-leaf tubes (202) are fixedly connected to the left and right ends of the outer wall of the twisted four-leaf tube (201), and an outer sleeve (204) is installed on the outer side of the twisted four-leaf tube (201).

2. A sleeve-type carbon dioxide gas cooler with a twisted four-leaf tube inner tube as described in claim 1, characterized in that: Each of the aforementioned damping mechanisms (3) includes a fixed ring (301), and each of the aforementioned fixed rings (301) is installed on the top of the outer wall of the load-bearing plate (1). A damper (302) is fixedly connected to the bottom of the outer wall of the fixed ring (301). A fixing plate (303) is fixedly connected to the left and right ends of the bottom of the outer wall of the damper (302). The bottom of the outer wall of each of the aforementioned fixing plates (303) is fixedly connected to the top of the outer wall of the load-bearing plate (1). The outer wall of the fixed ring (301) Support frames (304) are fixedly connected to the front and rear sides of the upper middle part. Long rod frames (305) are installed inside the multiple support frames (304). Rotating blocks (306) are fixedly connected to the left and right sides of the bottom end of the long rod frames (305). Rotating shafts (307) are fixedly connected to the bottom of the outer walls of the multiple rotating blocks (306). Rotating bases (308) are installed on the outer walls of the rotating shafts (307). The interior of the rotating bases (308) is rotatably connected to the outer walls of the rotating shafts (307).

3. A sleeve-type carbon dioxide gas cooler with a twisted four-leaf tube inner tube as described in claim 1, characterized in that: The load-bearing plate (1) is fixedly connected to the four corners at the bottom of each load-bearing column (4), and foot pads (5) are fixedly connected to the bottom of the outer wall of each load-bearing column (4).

4. A sleeve-type carbon dioxide gas cooler with a twisted four-leaf tube inner tube as described in claim 1, characterized in that: The outer sleeve (204) is equipped with a sealing ring (6) on both the left and right sides of its outer wall. The middle part of the sealing ring (6) is fixedly connected to the outer wall of the smooth four-leaf tube (202). A sealing ring (7) is fixedly connected to the outer wall of the sealing ring (6). The other end of the outer wall of the sealing ring (7) is fixedly connected to the outer wall of the outer sleeve (204).

5. A sleeve-type carbon dioxide gas cooler with an inner tube of a twisted four-leaf tube as described in claim 1, characterized in that: A pressure sensor (8) is installed at the top of the outer sleeve (204), and a pressure gauge (9) is fixedly connected to the top of the pressure sensor (8).

6. A sleeve-type carbon dioxide gas cooler with a twisted four-leaf tube inner tube as described in claim 1, characterized in that: Water pipes (10) are fixedly connected to the top left and right sides of the outer wall of the outer sleeve (204), and fixing plates (11) are fixedly connected to the top of the outer walls of the multiple water pipes (10).

7. A sleeve-type carbon dioxide gas cooler with an inner tube of a twisted four-leaf tube as described in claim 6, characterized in that: A water supply valve (14) is installed on the top of the outer wall of the fixed plate (11). The bottom end of the water supply valve (14) is connected with multiple bolts (13) at equal intervals. A turntable (15) is installed at the front end of the water supply valve (14).

8. A sleeve-type carbon dioxide gas cooler with a twisted four-leaf tube inner tube as described in claim 7, characterized in that: The top of the fixed plate (11) is provided with a plurality of bolt grooves (12) at equal intervals, and the interior of the bolt grooves (12) is threadedly connected to the outer wall of the bolt (13).

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