A transcritical carbon dioxide heat pump heat exchanger

Abstract

This utility model discloses a transcritical carbon dioxide heat pump heat exchange device, which includes a heat pump consisting of a column, a central support plate fixed on the column, two fans installed on the top of the central support plate, fins installed on the central support plate, and a base frame structure installed at the bottom of the central support plate. The base frame structure includes a support frame installed on the lower surface of the column, a carbon dioxide circulation assembly, a compressor circulation assembly, and a defrost solenoid valve installed on the support frame. The carbon dioxide circulation assembly includes a carbon dioxide compressor bolted to the top of the support frame. Compared with the prior art, this heat pump achieves efficient installation and disassembly / replacement of various components by changing the connection layout of the components on the base frame structure, effectively improving assembly and disassembly efficiency. Furthermore, by optimizing the pipeline connection layout, the number of parts used is reduced, thereby enhancing the practicality and convenience of the device.

Description

Technical Field

[0001] This utility model relates to the field of heating, ventilation and air conditioning technology, and in particular to a transcritical carbon dioxide heat pump heat exchange device. Background Technology

[0002] A carbon dioxide heat pump (CO2 heat pump) is a heat pump system that uses carbon dioxide (R-744) as a refrigerant. Its core technology achieves efficient heat transfer through a transcritical cycle. Working principle: Compression: The compressor compresses low-temperature, low-pressure CO2 gas to a high-temperature, high-pressure supercritical state (temperature can reach 80-100℃). Heat release: The high-temperature CO2 exchanges heat with cold water or air in the gas cooler, outputting high-temperature hot air. Expansion: After passing through the expansion valve, the CO2 becomes a low-temperature, low-pressure gas-liquid mixture that enters the finned evaporator. Heat absorption: After absorbing heat from the environment in the finned evaporator, the CO2 re-enters the compressor cycle.

[0003] In existing carbon dioxide heat pump systems, the pipeline layout is complex, which makes it difficult to assemble and disassemble the numerous components used for heat exchange, resulting in inconvenience in use, reduced assembly efficiency, and increased operational complexity. Therefore, optimizing the layout of multiple components and pipeline connections has become an urgent problem to be solved. Utility Model Content

[0004] In order to overcome the shortcomings of the existing carbon dioxide heat pump device, such as complicated pipeline layout, which makes it difficult to assemble and disassemble the many components used for heat exchange, resulting in inconvenience in use, one of the objectives of this utility model is to provide a transcritical carbon dioxide heat pump heat exchange device.

[0005] One of the objectives of this utility model is achieved through the following technical solution: a transcritical carbon dioxide heat pump heat exchange device, comprising a heat pump consisting of a column, a central support plate fixed on the column, two fans installed on the top of the central support plate, fins installed on the central support plate, and a bottom frame structure installed at the bottom of the central support plate; the bottom frame structure includes a support frame installed on the lower surface of the column, a carbon dioxide circulation assembly, a compressor circulation assembly, and a defrost solenoid valve installed on the support frame. This enhances the practicality of the device and the ease of assembly and disassembly.

[0006] According to the aforementioned transcritical carbon dioxide heat pump heat exchange device, the carbon dioxide circulation assembly includes a carbon dioxide compressor, an oil separator, a three-way valve, an air cooler, a subcooler, a safety valve, a high-pressure valve, a dryer filter, a buffer tank, a solenoid valve, a throttling valve, a two-way valve, and a gas-liquid separator, all bolted to the support frame. This achieves heat exchange.

[0007] According to the transcritical carbon dioxide heat pump heat exchange device, the exhaust port of the carbon dioxide compressor is connected to the first oil separator via a pipe. The first oil separator is connected to the main inlet of the first three-way valve via a pipe. The main outlet of the first three-way valve is connected to the inlet of the air cooler. The outlet of the air cooler is connected to the inlet of the subcooler via a pipe. The outlet of the subcooler is sequentially connected to the safety valve, the high-pressure valve, the first dryer filter, the buffer tank, the first solenoid valve, and the first throttle valve via a pipe. The outlet of the first throttle valve is connected to the main inlet of the second three-way valve via a pipe. The main outlet of the second three-way valve is connected to the fins via a pipe. The fins are connected to the first gas-liquid separator via a pipe. The first gas-liquid separator is connected to the return port of the carbon dioxide compressor via a pipe. This achieves carbon dioxide circulation.

[0008] According to the aforementioned transcritical carbon dioxide heat pump heat exchange device, the compressor circulation assembly includes a compressor, an oil separator, a condenser, a high-pressure liquid receiver, a dryer filter, a solenoid valve, a throttling valve, and a gas-liquid separator, all mounted above the support frame. The outlet of the throttling valve is connected to the inlet of the subcooler via a pipe, and the outlet of the subcooler is connected to the gas-liquid separator via a pipe. This achieves compressor circulation.

[0009] According to the transcritical carbon dioxide heat pump heat exchange device, the compressor's exhaust port is connected to the second oil separator via a pipe. The second oil separator is sequentially connected to the condenser, the high-pressure liquid receiver, the second dryer filter, the second solenoid valve, and the second throttle valve via pipes. The outlet of the second gas-liquid separator is connected to the compressor's return port via a pipe, thus achieving cyclic operation.

[0010] According to the aforementioned transcritical carbon dioxide heat pump heat exchange device, the compressor is an R134A compressor. It is more efficient and has better performance.

[0011] According to the transcritical carbon dioxide heat pump heat exchanger, the auxiliary outlet of the three-way valve one is connected to the defrosting solenoid valve, the defrosting solenoid valve is connected to the auxiliary outlet of the three-way valve two, the main outlet of the three-way valve two is connected to the fins via a pipe, the fins are connected to the gas-liquid separator one via a pipe, and the gas-liquid separator one is connected to the return port of the carbon dioxide compressor via a pipe. This achieves cyclic defrosting of the frost layer on the fin surface.

[0012] The above-mentioned solution has the following beneficial effects:

[0013] By modifying the connection layout of the components on the bottom frame structure, this heat pump achieves efficient installation and disassembly replacement of the components, effectively improving assembly and disassembly efficiency. Furthermore, by optimizing the pipeline connection layout, the number of parts used is reduced, thereby enhancing the practicality and convenience of the device.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0016] Figure 1 This is a schematic diagram of the overall structure of a transcritical carbon dioxide heat pump heat exchange device according to the present invention.

[0017] Figure 2 This is a schematic diagram of the carbon dioxide compressor in a transcritical carbon dioxide heat pump heat exchange device according to this utility model.

[0018] Figure 3 This is a schematic diagram of the carbon dioxide circulation component of a transcritical carbon dioxide heat pump heat exchanger according to the present invention.

[0019] Legend:

[0020] 1. Heat pump; 11. Column; 12. Central support plate; 13. Fan; 14. Fins; 15. Base frame structure; 151. Support frame; 152. Carbon dioxide circulation assembly; 1520. Carbon dioxide compressor; 1521. Oil separator I; 1522. Three-way valve I; 1523. Air cooler; 1524. Subcooler; 1525. Safety valve; 1526. High-pressure valve; 1527. Dryer filter I; 1528. Buffer tank; 1529. Solenoid Valve I; 15210. Throttling Valve I; 15211. Three-Way Valve II; 15212. Gas-Liquid Separator I; 153. Compressor Circulation Assembly; 1530. Compressor; 1531. Oil Separator II; 1532. Condenser; 1533. High-Pressure Liquid Receiver; 1534. Dryer Filter II; 1535. Solenoid Valve II; 1536. Throttling Valve II; 1537. Gas-Liquid Separator II; 154. Defrosting Solenoid Valve. Detailed Implementation

[0021] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0022] Reference Figure 1-3 A transcritical carbon dioxide heat pump heat exchange device includes a heat pump 1 consisting of a column 11, a central support plate 12 fixed on the column 11, two fans 13 mounted on the top of the central support plate 12, fins 14 mounted on the central support plate 12, and a bottom frame structure 15 mounted on the bottom of the central support plate 12. The bottom frame structure 15 includes a support frame 151 mounted on the lower surface of the column 11, a carbon dioxide circulation assembly 152 mounted on the support frame 151, and a compressor circulation assembly 153. 3 and defrost solenoid valve 154, carbon dioxide circulation assembly 152 includes a carbon dioxide compressor 1520 bolted to the support frame 151, oil separator 1521, three-way valve 1522, air cooler 1523, subcooler 1524, safety valve 1525, high-pressure valve 1526, dryer filter 1527, buffer tank 1528, solenoid valve 1529, throttle valve 15210, two three-way valves 15211, and gas-liquid separator 1520. 212. The exhaust port of the carbon dioxide compressor 1520 is connected to the oil separator 1521 via a pipe. The oil separator 1521 is connected to the main inlet of the three-way valve 1522 via a pipe. The main outlet of the three-way valve 1522 is connected to the inlet of the air cooler 1523. The outlet of the air cooler 1523 is connected to the inlet of the subcooler 1524 via a pipe. The outlet of the subcooler 1524 is connected to the safety valve 1525, the high-pressure valve 1526, and the drying valve via a pipe. Filter 1527, buffer tank 1528, solenoid valve 1529 and throttle valve 15210 are connected in sequence. The outlet of throttle valve 15210 is connected to the main inlet of three-way valve 2 15211 through a pipe. The main outlet of three-way valve 2 15211 is connected to fin 14 through a pipe. Fin 14 is connected to gas-liquid separator 15212 through a pipe. Gas-liquid separator 15212 is connected to the return port of carbon dioxide compressor 1520 through a pipe.

[0023] With this configuration, the carbon dioxide compressor 1520 compresses low-temperature, low-pressure gaseous carbon dioxide into a high-temperature, high-pressure supercritical fluid. The supercritical fluid enters the oil separator 1521, where the lubricating oil is separated, and the purified carbon dioxide enters the high-pressure heat dissipation stage. The supercritical carbon dioxide enters the air cooler 1523 via the three-way valve 1522, where it exchanges heat with the outside air or water, releasing high-temperature heat (at this time, the carbon dioxide still remains in a supercritical state), providing a heat source for the heating system. Then, the supercritical carbon dioxide undergoes subcooling and pressure reduction, passing sequentially through the safety valve 1525, high-pressure valve 1526, dryer filter 1527, buffer tank 1528, solenoid valve 1529, and throttle valve 15210. Safety valve 1525 provides overpressure protection, high-pressure valve 1526 regulates system pressure, dryer filter 1527 removes moisture and impurities, buffer tank 1528 stabilizes flow rate, solenoid valve 1529 controls on / off operation, and throttle valve 15210 is an expansion device that reduces the pressure of supercritical carbon dioxide to a subcritical state. Then, the low-temperature, low-pressure carbon dioxide (including some liquid) enters fin 14 through three-way valve 15211, absorbs ambient heat, and completely vaporizes, realizing the utilization of a low-temperature heat source. The gaseous carbon dioxide passes through gas-liquid separator 15212 to remove residual droplets and returns to the suction port of carbon dioxide compressor 1520, thus realizing the circulation of carbon dioxide.

[0024] The compressor circulation assembly 153 includes a compressor 1530, an oil separator 1531, a condenser 1532, a high-pressure liquid receiver 1533, a dryer filter 1534, a solenoid valve 1535, a throttle valve 1536, and a gas-liquid separator 1537, all mounted above the support frame 151. The outlet of the throttle valve 1536 is connected to the inlet of the subcooler 1524 via a pipe, and the outlet of the subcooler 1524 is connected to the gas-liquid separator 1537 via a pipe. The compressor 1530 is connected to the oil separator 1531 via a pipe. The oil separator 1531 is connected in sequence to the condenser 1532, the high-pressure liquid receiver 1533, the dryer filter 1534, the solenoid valve 1535, and the throttle valve 1536 via pipes. The outlet of the gas-liquid separator 1537 is connected to the return port of the compressor 1530 via a pipe. The compressor 1530 is an R134A compressor.

[0025] With this setup, after compressor 1530 starts, it draws in low-temperature, low-pressure gaseous carbon dioxide from gas-liquid separator 1537 and compresses it into high-temperature, high-pressure (supercritical or high-pressure gaseous) carbon dioxide. The exhaust port is connected to oil separator 1531 via a pipe to separate the lubricating oil from compressor 1530, ensuring that the lubricating oil does not enter the subsequent heat exchange system and affect efficiency. The high-temperature, high-pressure carbon dioxide enters condenser 1532 from oil separator 1531. After being condensed in condenser 1532, the carbon dioxide enters high-pressure liquid receiver 1533 for stabilization. The system flows and stores excess refrigerant. Then, high-pressure liquid carbon dioxide flows sequentially through dryer filter 1534, solenoid valve 1535, and throttle valve 1536. The high-pressure liquid carbon dioxide is rapidly depressurized through throttle valve 1536, becoming a low-temperature, low-pressure two-phase flow. The throttled low-temperature carbon dioxide then enters subcooler 1524 for further cooling, improving heat exchange efficiency. Subsequently, it enters gas-liquid separator 1537 to separate incompletely evaporated liquid carbon dioxide, ensuring that only gaseous carbon dioxide returns to compressor 1530, thus achieving circulation.

[0026] The auxiliary outlet of three-way valve 1522 is connected to defrost solenoid valve 154. Defrost solenoid valve 154 is connected to the auxiliary outlet of three-way valve 15211. The main outlet of three-way valve 15211 is connected to fin 14 via a pipe. Fin 14 is connected to gas-liquid separator 15212 via a pipe. Gas-liquid separator 15212 is connected to the return port of carbon dioxide compressor 1520 via a pipe.

[0027] With this setup, when the surface temperature of fin 14 is too low, the defrost solenoid valve 154 is opened, and the defrost mode is activated. At this time, the three-way valve 1522 is in the state of main circuit closed and auxiliary circuit open. The high-temperature and high-pressure carbon dioxide no longer flows to the air cooler 1523, but enters the defrost solenoid valve 154 through the auxiliary circuit outlet. The three-way valve 15211 is in the state of main circuit closed and auxiliary circuit open. The high-temperature carbon dioxide from the defrost solenoid valve 154 directly enters the fin 14 through the auxiliary circuit. Specifically, the high-temperature and high-pressure carbon dioxide discharged from the carbon dioxide compressor 1520 flows sequentially through the oil separator 152. 1. Three-way valve 1522 (auxiliary circuit), defrosting solenoid valve 154, three-way valve 2 15211 (auxiliary circuit), fin 14. High-temperature carbon dioxide condenses and releases heat inside fin 14, melting the frost layer on its surface to achieve the purpose of defrosting. The released carbon dioxide becomes a medium-temperature high-pressure liquid, which flows out of fin 14 and enters gas-liquid separator 15212. Gas-liquid separator 15212 separates liquid carbon dioxide, ensuring that only gaseous carbon dioxide returns to carbon dioxide compressor 1520, preventing damage to carbon dioxide compressor 1520, thereby facilitating defrosting operation and ensuring the normal operation of fin 14.

[0028] Working principle: By changing the connection layout of each component on the bottom frame structure 15, the efficient installation and disassembly of each component can be achieved, which effectively improves the assembly and disassembly efficiency. Furthermore, by optimizing the pipeline layout, the number of parts used is reduced, making it convenient to use.

[0029] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A transcritical carbon dioxide heat pump heat exchanger, characterized in that, The heat pump (1) consists of a column (11), a central support plate (12) fixed on the column (11), two fans (13) installed on the top of the central support plate (12), fins (14) installed on the central support plate (12), and a bottom frame structure (15) installed at the bottom of the central support plate (12). The bottom frame structure (15) includes a support frame (151) installed on the lower surface of the column (11), a carbon dioxide circulation assembly (152), a compressor circulation assembly (153), and a defrost solenoid valve (154) installed on the support frame (151).

2. The transcritical carbon dioxide heat pump heat exchanger according to claim 1, characterized in that, The carbon dioxide circulation assembly (152) includes a carbon dioxide compressor (1520), an oil separator (1521), a three-way valve (1522), an air cooler (1523), a subcooler (1524), a safety valve (1525), a high-pressure valve (1526), ​​a dryer filter (1527), a buffer tank (1528), a solenoid valve (1529), a throttle valve (15210), a three-way valve (15211), and a gas-liquid separator (15212), all bolted to the top of the support frame (151).

3. The transcritical carbon dioxide heat pump heat exchanger according to claim 2, characterized in that, The exhaust port of the carbon dioxide compressor (1520) is connected to the oil separator (1521) via a pipe. The oil separator (1521) is connected to the main inlet of the three-way valve (1522) via a pipe. The main outlet of the three-way valve (1522) is connected to the inlet of the air cooler (1523). The outlet of the air cooler (1523) is connected to the inlet of the subcooler (1524) via a pipe. The outlet of the subcooler (1524) is connected to the safety valve (1525), the high-pressure valve (1526), ​​and the dryer filter via pipes. The first (1527), the buffer tank (1528), the first solenoid valve (1529), and the first throttle valve (15210) are connected in sequence. The outlet of the first throttle valve (15210) is connected to the main inlet of the second three-way valve (15211) through a pipe. The main outlet of the second three-way valve (15211) is connected to the fin (14) through a pipe. The fin (14) is connected to the first gas-liquid separator (15212) through a pipe. The first gas-liquid separator (15212) is connected to the return port of the carbon dioxide compressor (1520) through a pipe.

4. The transcritical carbon dioxide heat pump heat exchanger according to claim 3, characterized in that, The compressor circulation assembly (153) includes a compressor (1530), an oil separator (1531), a condenser (1532), a high-pressure liquid receiver (1533), a dryer filter (1534), a solenoid valve (1535), a throttle valve (1536), and a gas-liquid separator (1537) mounted above the support frame (151). The outlet of the throttle valve (1536) is connected to the inlet of the subcooler (1524) via a pipe, and the outlet of the subcooler (1524) is connected to the gas-liquid separator (1537) via a pipe.

5. A transcritical carbon dioxide heat pump heat exchanger according to claim 4, characterized in that, The exhaust port of the compressor (1530) is connected to the second oil separator (1531) via a pipe. The second oil separator (1531) is connected in sequence to the condenser (1532), the high-pressure liquid receiver (1533), the second dryer filter (1534), the second solenoid valve (1535), and the second throttle valve (1536) via a pipe. The outlet of the second gas-liquid separator (1537) is connected to the return port of the compressor (1530) via a pipe.

6. A transcritical carbon dioxide heat pump heat exchanger according to claim 5, characterized in that, The compressor (1530) is an R134A compressor.

7. A transcritical carbon dioxide heat pump heat exchanger according to claim 2, characterized in that, The auxiliary outlet of the three-way valve one (1522) is connected to the defrost solenoid valve (154), the defrost solenoid valve (154) is connected to the auxiliary outlet of the three-way valve two (15211), the main outlet of the three-way valve two (15211) is connected to the fin (14) through a pipe, the fin (14) is connected to the gas-liquid separator one (15212) through a pipe, and the gas-liquid separator one (15212) is connected to the return port of the carbon dioxide compressor (1520) through a pipe.

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