Carbon dioxide refrigeration system
By incorporating a heat recovery unit and a refrigeration cycle unit into the carbon dioxide refrigeration system, effective heat recovery and utilization are achieved, solving the problem of resource waste in existing technologies, improving the system's flexibility and stability, and reducing power consumption.
Patent Information
- Application Number
- CN202422713190.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-11-07
AI Technical Summary
Existing carbon dioxide refrigeration systems have difficulty effectively recovering and utilizing the heat generated during the refrigeration cycle, resulting in resource waste.
A carbon dioxide refrigeration system was designed, which includes components such as a gas cooler, ejector, gas-liquid separator, compressor, heat exchanger and pump. By setting up a heat recovery unit and a refrigeration cycle unit, heat can be recovered and utilized. The use of heat can be controlled by controlling valves and thermometers, thereby improving the system's flexibility.
It improves resource recycling efficiency, reduces system power consumption, enhances system flexibility and stability, and avoids resource waste.
Smart Images
Figure CN223499815U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of refrigeration technology, and in particular to a carbon dioxide refrigeration system. Background Technology
[0002] Refrigeration technology plays a vital role in people's production and daily life, but it also brings huge energy consumption and a series of environmental problems. Carbon dioxide is a very environmentally friendly, all-natural refrigerant with an ozone depletion potential of 0 and a global warming potential of only 1. It is non-toxic, non-flammable, has a large refrigeration capacity per unit volume, and is widely available.
[0003] Refrigeration systems generate a large amount of heat energy during the process of producing low temperatures. However, existing carbon dioxide refrigeration systems are unable to effectively recover and utilize this heat, resulting in the direct release of heat into the atmosphere and a waste of resources. Utility Model Content
[0004] This invention provides a carbon dioxide refrigeration system to solve the problem that the heat generated during the refrigeration cycle and cooling of the refrigerant in existing carbon dioxide refrigeration systems is difficult to recover and utilize, resulting in resource waste.
[0005] This utility model provides a carbon dioxide refrigeration system, including an air cooler, an ejector, and a gas-liquid separator connected in sequence. A first compressor is connected after the gas phase outlet of the gas-liquid separator, and a first valve, a first pump, a first evaporator, and a second compressor are connected in sequence after the liquid phase outlet. Both the first and second compressors are connected to a third valve. The third valve is also connected to the hot fluid inlet of a first heat exchanger and a fourth valve. The hot fluid outlet of the first heat exchanger is connected to the fourth valve. The cold fluid inlet and outlet of the first heat exchanger are connected to the cold water outlet and hot water inlet of a hot water tank, respectively. The fourth valve is also connected to the hot fluid inlet of the second heat exchanger and the air cooler. The hot fluid outlet of the second heat exchanger is connected to the air cooler. The cold fluid inlet and outlet of the second heat exchanger are connected to a heating network. The first evaporator is also connected to the ejector through a ninth valve.
[0006] Optionally, the hot water outlet of the hot water tank is connected to the storage tank via a fifth valve. A first thermometer is also installed between the hot water tank and the fifth valve. A sixth valve is connected in parallel between the first thermometer and the fifth valve. The sixth valve is also connected to the cold water inlet and cold water pipeline of the storage tank. The hot water outlet of the storage tank is connected to the water supply pipeline. A water pump is also installed between the hot water tank and the cold fluid inlet of the first heat exchanger. The first thermometer, the fifth valve, and the sixth valve are all electrically connected to the first controller.
[0007] Optionally, a second thermometer and a seventh valve are sequentially installed between the hot fluid outlet of the second heat exchanger, the fourth valve, and the air cooler along the refrigerant flow direction. The seventh valve is also connected to the ejector. Both the second thermometer and the seventh valve are electrically connected to the second controller.
[0008] Optionally, a third thermometer and a first pressure sensor are also provided between the first evaporator and the second compressor, and the first valve, the third thermometer, and the first pressure sensor are all electrically connected to the third controller.
[0009] Optionally, the liquid outlet of the gas-liquid separator is also connected to a secondary refrigeration pipeline in parallel with the first evaporator. The secondary refrigeration pipeline includes an eighth valve, a second pump, a second evaporator, and a third compressor connected in sequence. The outlets of the first evaporator and the third compressor are connected together to the second compressor. A fourth thermometer and a second pressure sensor are also provided between the second evaporator and the third compressor. The eighth valve, the fourth thermometer, and the second pressure sensor are all electrically connected to the fourth controller.
[0010] Optionally, the second evaporator is also connected to the ejector via a tenth valve.
[0011] Optionally, the ejector includes a first inlet and a second inlet. Both the first and second inlets are sequentially connected to a mixing pipe and a diffuser chamber along the material flow direction after the premixing chamber. A static mixer is installed inside the mixing pipe. The first inlet is connected to the outlet of the air cooler, and the second inlet is connected to the ninth valve and the tenth valve.
[0012] Optionally, the static mixer is formed by connecting multiple single-helix structured baffles in series, with adjacent baffles arranged in a mirror image.
[0013] The beneficial effects of the dioxide tower refrigeration system provided by this utility model include: 1. By setting a first heat exchanger connected to a hot water tank and a second heat exchanger connected to a heating network, a large amount of heat energy released during the refrigerant cooling process is recovered, improving the efficiency of resource recovery and utilization and avoiding resource waste. Simultaneously, the first heat exchanger, the second heat exchanger, and the refrigeration cycle unit are connected by a three-way valve, allowing users to control the use of heat recovery according to their needs, thus improving the system's flexibility.
[0014] 2. By adding a storage tank and related pipelines after the hot water tank, the hot water tank acts as a buffer, improving system safety. It also reduces temperature fluctuations in the user's water supply, resulting in more stable hot water temperatures and enhanced system stability.
[0015] 3. By setting up a second temperature sensor, a seventh valve, and a second controller, the flow direction of the refrigerant after heat recovery can be controlled, improving the system's flexibility. Simultaneously, for refrigerants that no longer require cooling, they can be controlled to bypass the air cooler and continue the refrigeration cycle directly, eliminating the need for air cooling, thus reducing system power consumption and costs. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the carbon dioxide refrigeration system provided in Embodiment 1 of this utility model;
[0018] Figure 2 This is a schematic diagram of the carbon dioxide refrigeration system provided in Embodiment 2 of this utility model;
[0019] Figure 3 This is a schematic diagram of the carbon dioxide refrigeration system provided in Embodiment 3 of this utility model;
[0020] Figure 4 This is a schematic diagram of the ejector provided in Embodiment 1 of this utility model.
[0021] Explanation of reference numerals in the attached figures:
[0022] 1-Air cooler, 2-Ejector, 3-Gas-liquid separator, 4-First compressor, 5-First valve, 6-First pump, 7-First evaporator, 8-Second compressor, 9-Third valve, 10-First heat exchanger, 11-Fourth valve, 12-Hot water tank, 13-Second heat exchanger, 14-Fifth valve, 15-Water storage tank, 16-First thermometer, 17-Sixth valve, 18-Water pump, 19-First controller, 20-Second thermometer, 21-Seventh valve, 22-Second controller 23-Third thermometer, 24-First pressure sensor, 25-Third controller, 26-Eighth valve, 27-Second pump, 28-Second evaporator, 29-Third compressor, 30-Fourth thermometer, 31-Second pressure sensor, 32-Fourth controller, 33-Ninth valve, 34-Tenth valve, 201-First inlet, 202-Second inlet, 203-Premixing chamber, 204-Mixing tube, 205-Static mixer, 206-Diffuser chamber, 208-Breakout vane. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this utility model.
[0024] like Figure 1 As shown, this utility model provides a carbon dioxide refrigeration system, including an air cooler 1, an ejector 2, and a gas-liquid separator 3 connected in sequence. A first compressor 4 is connected after the gas phase outlet of the gas-liquid separator 3, and a first valve 5, a first pump 6, a first evaporator 7, and a second compressor 8 are connected in sequence after the liquid phase outlet. The first compressor 4 and the second compressor 8 are both connected to a third valve 9. The third valve 9 is also connected to the hot fluid inlet of the first heat exchanger 10 and a fourth valve 11. The hot fluid outlet of the first heat exchanger 10 is connected to the fourth valve 11. The cold fluid inlet and cold fluid outlet of the first heat exchanger 10 are connected to the cold water outlet and hot water inlet of the hot water tank 12, respectively. The fourth valve 11 is also connected to the hot fluid inlet of the second heat exchanger 13 and the air cooler 1. The hot fluid outlet of the second heat exchanger 13 is connected to the air cooler 1. The cold fluid inlet and outlet of the second heat exchanger 13 are connected to the heating network. The first evaporator 7 is also connected to the ejector 2 through a ninth valve 33.
[0025] The carbon dioxide refrigeration system comprises two parts. One part is a refrigeration cycle unit consisting of a gas cooler 1, an ejector 2, a gas-liquid separator, a first compressor 4, a first valve 5, a first pump 6, a first evaporator 7, a second compressor 8, a third valve 9, a fourth valve 11, and a ninth valve 33. The other part is a heat recovery unit consisting of a first heat exchanger 10, a hot water tank 12, and a second heat exchanger 13. The refrigeration cycle unit is used for cooling the refrigerant and performing the main refrigeration work, while the heat recovery unit recovers the heat generated by the refrigerant during the cooling process. The first valve 5 is a throttling valve, and the third valve 9 and the fourth valve 11 are three-way valves. The refrigerant in the entire system is carbon dioxide.
[0026] When the carbon dioxide refrigeration system is working, the refrigeration cycle unit operates first: the refrigerant discharged from ejector 2 enters the gas-liquid separator 3, where it is separated into saturated liquid and gas. The saturated liquid is throttled by the first valve 5, becoming a low-pressure fluid, and is then pumped into the first evaporator 7 by the first pump 6. In the first evaporator 7, the refrigerant comes into contact with hot air (the medium or environment to be refrigerated), absorbing heat and evaporating to achieve a cooling effect. The refrigerant, after absorbing heat and becoming gas, is discharged from the first evaporator 7. Part of the discharged refrigerant returns to ejector 2, and the rest is compressed by the second compressor 8. The gas discharged from the gas-liquid separator 3 is compressed by the first compressor 4. The compressed gas from the first compressor 4 and the second compressor 8 enter the heat recovery unit for cooling, recovering the heat generated during the cooling process. After flowing out of the heat recovery unit, the refrigerant enters the air cooler 1 for further cooling, and finally flows back into ejector 2 to continue the cycle.
[0027] The heat recovery unit includes a first heat exchanger 10 and a second heat exchanger 13. By controlling the opening and closing of the third valve 9, refrigerant from the first compressor 4 and the second compressor 8 is fed into the first heat exchanger 10 to heat the water from the hot water tank 12. After heating, the water is ready for user use. The refrigerant's flow from the first heat exchanger 10 can be controlled according to specific usage requirements. When heating is needed, the opening and closing of the fourth valve 11 sends the refrigerant from the first heat exchanger 10 to the second heat exchanger 13, which heats the heating water in the heating network. After heat recovery through the two-stage heat exchangers, the refrigerant is sent to the air cooler 1 for cooling, and then sent to the ejector 2 to continue the next cycle. In actual use, the third valve 9 and the fourth valve 11 can be controlled as needed to allow the refrigerant to enter only the first heat exchanger 10 or the second heat exchanger 13 for heat exchange, or it can enter both heat exchangers simultaneously.
[0028] The carbon dioxide refrigeration system provided by this utility model recovers a large amount of heat energy released during the refrigerant cooling process by setting up a first heat exchanger 10 connected to the hot water tank 12 and a second heat exchanger 13 connected to the heating network, thereby improving the efficiency of resource recovery and utilization and avoiding resource waste. At the same time, the first heat exchanger 10, the second heat exchanger 13, and the refrigeration cycle unit are connected by a three-way valve, allowing users to control the use of heat recovery according to their needs, thus improving the system's flexibility.
[0029] like Figure 2As shown, the hot water outlet of the hot water tank 12 is further connected to the storage tank 15 via the fifth valve 14. A first thermometer 16 is also installed between the hot water tank 12 and the fifth valve 14. A sixth valve 17 is connected in parallel between the first thermometer 16 and the fifth valve 14. The sixth valve 17 is also connected to the cold water inlet and cold water pipeline of the storage tank 15. The hot water outlet of the storage tank 15 is connected to the water supply pipeline. A water pump 18 is also installed between the hot water tank 12 and the cold fluid inlet of the first heat exchanger 10. The first thermometer 16, the fifth valve 14, and the sixth valve 17 are all electrically connected to the first controller 19.
[0030] A storage tank 15 is connected to the outlet of the hot water tank 12 via a fifth valve 14. During operation, cold water from the cold water pipe enters the hot water tank 12 through a sixth valve 17. The water to be heated in the hot water tank 12 is then pumped to the first heat exchanger 10 for heating via a water pump 18. The heated water in the hot water tank 12 passes through a first thermometer 16 and a fifth valve 14 before being sent to the storage tank 15 for later use. The hot water flowing out of the hot water tank 12 has its temperature measured by the first thermometer 16, and the signal is sent to the first controller 19. When the temperature of the hot water in the hot water tank 12 reaches the set value, the first controller 19 controls the opening and closing of the fifth valve 14 and the sixth valve 17, allowing the pipeline between the hot water tank 12, the fifth valve 14, and the storage tank 15 to flow, and closing the pipeline between the hot water tank 12, the sixth valve 17, and the hot water to enter the storage tank 15 for later use. When the temperature of the hot water in the hot water tank 12 does not reach the set value, the first thermometer 16 transmits the temperature measurement result to the first controller 19. The first controller 19 controls the opening and closing of the fifth valve 14 and the sixth valve 17, so that the pipeline between the hot water tank 12, the fifth valve 14 and the water storage tank 15 is closed, and the pipeline between the hot water tank 12, the sixth valve 17 and the hot water tank 12 is open, so that the hot water enters the hot water tank 12 and is reheated by the first heat exchanger 10.
[0031] By adding a storage tank 15 and related pipelines after the hot water tank 12, the hot water tank 12 acts as a buffer tank, improving the safety of the system. It also reduces temperature fluctuations in the user's water supply, resulting in more stable hot water temperatures and improved system stability.
[0032] like Figure 2 As shown, furthermore, a second thermometer 20 and a seventh valve 21 are sequentially installed between the hot fluid outlet of the second heat exchanger 13, the fourth valve 11, and the air cooler 1 along the refrigerant flow direction. The seventh valve 21 is also connected to the ejector 2. Both the second thermometer 20 and the seventh valve 21 are electrically connected to the second controller 22.
[0033] The refrigerant flowing from the hot fluid outlet of the second heat exchanger 13 or the fourth valve 11, destined for cooling in the air cooler 1, must first have its temperature measured by the second thermometer 20. The temperature measurement result is then fed back to the second controller 22. When the detected refrigerant temperature decreases or approaches the original outlet temperature of the air cooler 1, the second controller 22 controls the opening and closing of the seventh valve 21, allowing the refrigerant to bypass the air cooler 1 and directly enter the ejector 2. There, it mixes with the refrigerant returning from the first evaporator 7, expands, and accelerates to continue the refrigeration cycle. When the detected refrigerant temperature is still too high and further cooling is required, the second controller 22 controls the opening and closing of the seventh valve 21, allowing the refrigerant to be cooled by the air cooler 1 before entering the ejector 2. There, it mixes with the refrigerant returning from the first evaporator 7, expands, and accelerates to continue the refrigeration cycle.
[0034] By setting up a second temperature sensor 20, a seventh valve 21, and a second controller 22, the flow direction of the refrigerant after heat recovery can be controlled, improving the system's flexibility. Simultaneously, for refrigerants that no longer require cooling, they can be controlled to bypass the air cooler 1 and continue the refrigeration cycle directly, eliminating the need for cooling by the air cooler 1, thus reducing system power consumption and cost.
[0035] like Figure 3 As shown, a third thermometer 23 and a first pressure sensor 24 are further provided between the first evaporator 7 and the second compressor 8. The first valve 5, the third thermometer 23, and the first pressure sensor 24 are all electrically connected to the third controller 25.
[0036] A third thermometer 23 and a first pressure sensor 24 are installed between the first evaporator 7 and the second compressor 8 to detect the temperature and pressure of the refrigerant flowing out of the first evaporator 7. The third controller 25 controls the opening of the first valve 5 based on the detected pressure and temperature to adjust the cooling capacity of the first evaporator 7.
[0037] like Figure 3 As shown, further, the liquid phase outlet of the gas-liquid separator 3 is also connected to a secondary refrigeration pipeline in parallel with the first evaporator 7. The secondary refrigeration pipeline includes an eighth valve 26, a second pump 27, a second evaporator 28, and a third compressor 29 connected in sequence. The outlets of the first evaporator 7 and the third compressor 29 are connected together to the second compressor 8. A fourth thermometer 30 and a second pressure gauge 31 are also provided between the second evaporator 28 and the third compressor 29. The eighth valve 26, the fourth thermometer 30, and the second pressure gauge 31 are all electrically connected to the fourth controller 32. Further, the second evaporator 28 is also connected to the ejector 2 through a tenth valve 34.
[0038] A secondary refrigeration pipeline connected in parallel with the first evaporator 7 is connected to the liquid phase outlet of the gas-liquid separator 3. The refrigeration conditions can be set to be the same as or different from those of the first evaporator 7 according to the requirements, thereby improving the operability and flexibility of the system. Its working process is the same as that of the first evaporator, and will not be described in detail here.
[0039] like Figure 4 As shown, the ejector 2 further includes a first inlet 201 and a second inlet 202. Both the first inlet 201 and the second inlet 202 are sequentially connected to a mixing pipe 204 and a diffuser chamber 206 along the material flow direction after the premixing chamber 203. A static mixer 205 is installed inside the mixing pipe 204. The first inlet 201 is connected to the outlet of the air cooler 1, and the second inlet 202 is connected to the ninth valve 33 and the tenth valve 34. Furthermore, the static mixer 205 is formed by multiple single-helix structure baffles 208 connected in series, and adjacent baffles 208 are arranged in a mirror image.
[0040] The first inlet 201 on ejector 2 receives refrigerant from air cooler 1 and seventh valve 21, while the second inlet 202 receives refrigerant returning from first evaporator 7 and second evaporator 28. After entering ejector 2, the two refrigerant streams are premixed in premixing chamber 203 and then enter mixing tube 204. The static mixer 205 in mixing tube 204 consists of multiple single-helix, mirror-arranged baffles 208 connected in series, which can thoroughly mix the two fluid streams. The mixed refrigerant expands and is ejected from diffuser chamber 206 to gas-liquid separator 3.
[0041] The present invention will be further described in detail below with reference to specific embodiments.
[0042] Example 1
[0043] When the carbon dioxide refrigeration system is working, the refrigerant discharged from the diffuser chamber 206 of the ejector 2 enters the gas-liquid separator 3, where it is separated into saturated liquid and gas. The saturated liquid becomes a low-pressure fluid after being throttled by the first valve 5, and is then pumped into the first evaporator 7 by the first pump 6. In the first evaporator 7, the refrigerant comes into contact with hot air (the medium or environment to be refrigerated), absorbing heat and evaporating to achieve a refrigeration effect. The refrigerant, after absorbing heat and becoming a gas, is discharged from the first evaporator 7. Part of the discharged refrigerant returns to the ejector 2 through the second inlet 202, and the rest is compressed by the second compressor 8. The compressed gas from the first compressor 4 and the second compressor 8 enters the heat recovery unit composed of the first heat exchanger 10 and the second heat exchanger 13 through the third valve 9 for heat recovery. The first heat exchanger 10 heats the water from the hot water tank 12. After heating, the water is ready for use by the user. After the refrigerant flows out of the first heat exchanger 10, when heating is needed, the opening and closing of the fourth valve 11 controls the refrigerant from the first heat exchanger 10 to be sent to the second heat exchanger 13, which heats the heating water in the heating network. When heating is not needed, the refrigerant is directly sent from the first heat exchanger 10 to the air cooler 1 for cooling, and then enters the ejector 2 through the first inlet 201 to continue the refrigeration cycle. A static mixer 205 is installed in the mixing tube 204 of the ejector 2 to fully mix the two streams of material from the first inlet 201 and the second inlet 202.
[0044] Example 2
[0045] Based on Example 1, Example 2 provides a structure and specific operating process to improve the stability of the system during heat recovery and reduce system power consumption: The refrigerant flowing from the hot fluid outlet of the second heat exchanger 13 or the fourth valve 11, which is to be sent to the air cooler 1 for cooling, must first be temperature-measured by the second thermometer 20, and the temperature measurement result is fed back to the second controller 22. When the detected refrigerant temperature decreases or approaches the original outlet temperature of the air cooler 1, the second controller 22 controls the opening and closing of the seventh valve 21, so that the refrigerant bypasses the air cooler 1 and directly enters the ejector 2, where it mixes with the refrigerant returning from the first evaporator 7 and expands to continue the refrigeration cycle. When the detected refrigerant still has a high temperature and needs to be cooled further, the second controller 22 controls the opening and closing of the seventh valve 21, so that the refrigerant is cooled by the air cooler 1 and then enters the ejector 2, where it mixes with the refrigerant returning from the first evaporator 7 and expands to continue the refrigeration cycle.
[0046] Meanwhile, a storage tank 15 is connected to the outlet of the hot water tank 12 via a fifth valve 14. During operation, cold water from the cold water pipe enters the hot water tank 12 through a sixth valve 17. The water to be heated in the hot water tank 12 is then pumped to the first heat exchanger 10 for heating via a water pump 18. The heated hot water in the hot water tank 12 passes through a first thermometer 16 and a fifth valve 14 before being sent to the storage tank 15 for later use. The hot water flowing out of the hot water tank 12 has its temperature measured by the first thermometer 16, and the signal is sent to the first controller 19. When the temperature of the hot water in the hot water tank 12 reaches the set value, the first controller 19 controls the opening and closing of the fifth valve 14 and the sixth valve 17, allowing the pipeline between the hot water tank 12, the fifth valve 14, and the storage tank 15 to flow, and closing the pipeline between the hot water tank 12, the sixth valve 17, and the hot water to enter the storage tank 15 for later use. When the temperature of the hot water in the hot water tank 12 does not reach the set value, the first thermometer 16 transmits the temperature measurement result to the first controller 19. The first controller 19 controls the opening and closing of the fifth valve 14 and the sixth valve 17, so that the pipeline between the hot water tank 12, the fifth valve 14 and the water storage tank 15 is closed, and the pipeline between the hot water tank 12, the sixth valve 17 and the hot water tank 12 is open, so that the hot water enters the hot water tank 12 and is reheated by the first heat exchanger 10.
[0047] Example 3
[0048] Based on Example 2, Example 3 also provides a system structure to improve the flexibility of the refrigeration process: a third thermometer 23 and a first pressure meter 24 are set between the first evaporator 7 and the second compressor 8 to detect the temperature and pressure of the refrigerant flowing out of the first evaporator 7, and the third controller 25 controls the opening of the first valve 5 by detecting the pressure and temperature, so as to adjust the refrigeration capacity of the first evaporator 7.
[0049] A secondary refrigeration pipeline, connected in parallel with the first evaporator 7, is also connected to the liquid phase outlet of the gas-liquid separator 3. This secondary refrigeration pipeline includes an eighth valve 26, a second pump 27, a second evaporator 28, and a third compressor 29 connected in sequence. The outlets of the first evaporator 7 and the third compressor 29 are connected together to the second compressor 8. A fourth thermometer 30 and a second pressure gauge 31 are also installed between the second evaporator 28 and the third compressor 29. The eighth valve 26, the fourth thermometer 30, and the second pressure gauge 31 are all electrically connected to the fourth controller 32. The second evaporator 28 is also connected to the ejector 2 via a tenth valve 34. During use, the refrigeration conditions can be set to be the same as or different from those of the first evaporator 7, improving the system's operability and flexibility. Its operating process is consistent with that of the first evaporator.
[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A carbon dioxide refrigeration system, characterized in that, The system includes a gas cooler (1), an ejector (2), and a gas-liquid separator (3) connected in sequence. A first compressor (4) is connected after the gas phase outlet of the gas-liquid separator (3), and a first valve (5), a first pump (6), a first evaporator (7), and a second compressor (8) are connected in sequence after the liquid phase outlet. Both the first compressor (4) and the second compressor (8) are connected to a third valve (9). The third valve (9) is also connected to the hot fluid inlet of the first heat exchanger (10) and a fourth valve (11). The hot fluid outlet of the first heat exchanger (10) is... The first heat exchanger (10) is connected to the fourth valve (11). The cold fluid inlet and cold fluid outlet of the first heat exchanger (10) are connected to the cold water outlet and hot water inlet of the hot water tank (12), respectively. The fourth valve (11) is also connected to the hot fluid inlet of the second heat exchanger (13) and the air cooler (1). The hot fluid outlet of the second heat exchanger (13) is connected to the air cooler (1). The cold fluid inlet and outlet of the second heat exchanger (13) are connected to the heating network. The first evaporator (7) is also connected to the ejector (2) through the ninth valve (33).
2. The carbon dioxide refrigeration system according to claim 1, characterized in that, The hot water outlet of the hot water tank (12) is connected to the water storage tank (15) through the fifth valve (14). A first thermometer (16) is also installed between the hot water tank (12) and the fifth valve (14). A sixth valve (17) is connected in parallel between the first thermometer (16) and the fifth valve (14). The sixth valve (17) is also connected to the cold water inlet and cold water pipeline of the water storage tank (15). The hot water outlet of the water storage tank (15) is connected to the water supply pipeline. A water pump (18) is also provided between the hot water tank (12) and the cold fluid inlet of the first heat exchanger (10); The first thermometer (16), the fifth valve (14), and the sixth valve (17) are all electrically connected to the first controller (19).
3. The carbon dioxide refrigeration system according to claim 1, characterized in that, A second thermometer (20) and a seventh valve (21) are installed sequentially between the hot fluid outlet of the second heat exchanger (13), the fourth valve (11) and the air cooler (1) along the refrigerant flow direction. The seventh valve (21) is also connected to the ejector (2). The second thermometer (20) and the seventh valve (21) are both electrically connected to the second controller (22).
4. The carbon dioxide refrigeration system according to claim 1, characterized in that, A third thermometer (23) and a first pressure sensor (24) are also provided between the first evaporator (7) and the second compressor (8). The first valve (5), the third thermometer (23), and the first pressure sensor (24) are all electrically connected to the third controller (25).
5. The carbon dioxide refrigeration system according to claim 1, characterized in that, The liquid phase outlet of the gas-liquid separator (3) is also connected to a secondary refrigeration pipeline in parallel with the first evaporator (7). The secondary refrigeration pipeline includes an eighth valve (26), a second pump (27), a second evaporator (28), and a third compressor (29) connected in sequence. The outlets of the first evaporator (7) and the third compressor (29) are connected together to the second compressor (8). A fourth thermometer (30) and a second pressure sensor (31) are also provided between the second evaporator (28) and the third compressor (29). The eighth valve (26), the fourth thermometer (30), and the second pressure sensor (31) are all electrically connected to the fourth controller (32).
6. The carbon dioxide refrigeration system according to claim 5, characterized in that, The second evaporator (28) is also connected to the ejector (2) via the tenth valve (34).
7. The carbon dioxide refrigeration system according to claim 6, characterized in that, The ejector (2) includes a first inlet (201) and a second inlet (202). The first inlet (201) and the second inlet (202) are connected in sequence to a mixing pipe (204) and a diffuser (206) along the material flow direction after the premixing chamber (203). A static mixer (205) is installed in the mixing pipe (204). The first inlet (201) is connected to the outlet of the air cooler (1), and the second inlet (202) is connected to the ninth valve (33) and the tenth valve (34).
8. The carbon dioxide refrigeration system according to claim 7, characterized in that, The static mixer (205) is formed by a series of multiple single-helix structure baffles (208) connected in series, and the baffles (208) are mirror images of each other.