CN211233446U - Direct-current frequency conversion overlapping carbon dioxide heat pump unit - Google Patents
Direct-current frequency conversion overlapping carbon dioxide heat pump unit Download PDFInfo
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- CN211233446U CN211233446U CN201921773031.5U CN201921773031U CN211233446U CN 211233446 U CN211233446 U CN 211233446U CN 201921773031 U CN201921773031 U CN 201921773031U CN 211233446 U CN211233446 U CN 211233446U
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Abstract
The utility model discloses a direct current frequency conversion overlapping carbon dioxide heat pump unit, including high temperature side refrigerating system, low temperature side refrigerating system, the inside evaporative condenser who has fourth heat transfer pipeline and the fifth heat transfer pipeline of mutual heat transfer, high temperature side refrigerating system includes high temperature side compressor, the inside has the air cooler in first heat transfer pipeline and the heat transfer water route of mutual heat transfer, the choke valve, the finned heat exchanger, first three-way valve and second three-way valve, low temperature side refrigerating system includes low temperature side compressor, the inside has the regenerator in second heat transfer pipeline and the third heat transfer pipeline of mutual heat transfer, evaporimeter and expansion valve, this heat pump unit has the first operating condition that is less than the settlement temperature and the second operating condition that is higher than the settlement temperature, under the first operating condition, two refrigerating systems carry out the heat transfer through evaporative condenser, under the second operating condition, high temperature side refrigerating system carries out the heat transfer through finned heat exchanger and external environment, the low temperature side refrigeration system stops operating.
Description
Technical Field
The utility model relates to a carbon dioxide heat pump technical field, in particular to direct current frequency conversion overlapping carbon dioxide heat pump set.
Background
The carbon dioxide heat pump unit adopts carbon dioxide as a refrigerant, the heat release of the carbon dioxide is supercritical circulation, the thermophysical property of the carbon dioxide is utilized, the exhaust temperature of the compressor is high, the energy efficiency ratio is high, and the carbon dioxide heat pump unit is widely applied to various heating systems and hot water engineering. The carbon dioxide heat pump unit generally includes a compressor, an air cooler, an expansion valve, and an evaporator connected in sequence via a refrigerant line, where the refrigerant line exchanges heat with a water path at a user side to supply hot water to the user. Under the environment of lower than-25 ℃, the single-stage carbon dioxide heat pump unit is easy to have the conditions of reduced heating capacity, reduced heating performance, unstable operation and even abnormal work.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model aims at providing a can be adapted to under the extremely cold environment, the operation is more stable, the better direct current frequency conversion overlapping carbon dioxide heat pump set of heating performance.
In order to realize the purpose of the utility model, the utility model adopts the following technical scheme:
a direct current frequency conversion overlapping carbon dioxide heat pump unit includes:
the high-temperature side refrigeration system comprises a high-temperature side compressor, an air cooler, a throttle valve, a fin heat exchanger, a first three-way valve and a second three-way valve, wherein a first heat exchange pipeline and a heat exchange waterway which exchange heat mutually are arranged in the air cooler, the first three-way valve is provided with a first valve port, a second valve port and a third valve port, and the second three-way valve is provided with a fourth valve port, a fifth valve port and a sixth valve port;
the low-temperature side refrigerating system comprises a low-temperature side compressor, a heat regenerator, an evaporator and an expansion valve, wherein the low-temperature side compressor is a direct-current variable-frequency compressor, and a second heat exchange pipeline and a third heat exchange pipeline which exchange heat with each other are arranged in the heat regenerator;
the evaporative condenser is internally provided with a fourth heat exchange pipeline and a fifth heat exchange pipeline which exchange heat with each other;
the direct-current frequency-conversion cascade carbon dioxide heat pump unit has a first working state lower than a set temperature and a second working state higher than the set temperature, in the first working state, the first valve port and the third valve port are communicated, the fifth valve port and the sixth valve port are communicated, the high-temperature side compressor, the first heat exchange pipeline, the throttle valve, the first valve port, the third valve port, the fourth heat exchange pipeline, the fifth valve port and the sixth valve port are communicated through the first refrigerant pipeline in sequence to form a first loop for circulating a Freon refrigerant, and the low-temperature side compressor, the fifth heat exchange pipeline, the second heat exchange pipeline, the expansion valve, the evaporator and the third heat exchange pipeline are communicated through the second refrigerant pipeline in sequence to form a second loop for circulating the carbon dioxide refrigerant; in the second working state, the first valve port and the second valve port are communicated, the fourth valve port and the sixth valve port are communicated, the high-temperature side compressor, the first heat exchange pipeline, the throttle valve, the first valve port, the second valve port, the fin heat exchanger, the fourth valve port and the sixth valve port are communicated in sequence through a third refrigerant pipeline to form a third loop for circulating Freon refrigerant, and the low-temperature side refrigeration system stops working.
In the above-described aspect, preferably, the high-temperature side compressor further includes a first gas-liquid separator, one end of the first gas-liquid separator communicates with the gas inlet of the high-temperature side compressor, and the other end communicates with the sixth valve port.
In the above technical solution, preferably, the heat exchanger further includes a second gas-liquid separator, one end of the second gas-liquid separator is communicated with the gas inlet of the low temperature side compressor, and the other end is communicated with the outlet of the third heat exchange pipe.
In the above-described aspect, it is preferable that the first refrigerant line and the third refrigerant line partially overlap each other.
In the above technical solution, preferably, the first refrigerant pipe and the third refrigerant pipe have two overlapping sections, one of the overlapping sections is a path portion from the outlet of the high temperature side compressor to the first valve port, and the other overlapping section is a path portion from the sixth valve port to the inlet of the high temperature side compressor.
In the above technical solution, preferably, the set temperature is-25 ℃ to-30 ℃.
The utility model discloses a set up high temperature side refrigerating system and low temperature side refrigerating system, high temperature side refrigerating system and low temperature side refrigerating system carry out the heat transfer through evaporative condenser, thereby low temperature side refrigerating system supplies heat for high temperature side refrigerating system, high temperature side condensing system carries out the heat transfer through the first heat transfer pipeline and the heat transfer water route of air cooler, thereby supply heat for the heat transfer water route, according to setting for the temperature, realize the conversion of heat pump set's operating condition through the switching of the valve port of control each three-way valve, thereby improve the heat pump heating performance under extremely cold environment, make it move more stably; the low-temperature side compressor adopts a direct-current variable-frequency compressor, and the input power of the low-temperature side compressor is reduced and the energy consumption of the heat pump unit is reduced by controlling the working frequency of the low-temperature side compressor.
Drawings
FIG. 1 is a schematic diagram of the structure of a DC variable frequency cascade carbon dioxide heat pump unit of the present invention in a first working state;
FIG. 2 is a schematic diagram of the structure of the DC variable frequency overlapping carbon dioxide heat pump unit of the present invention in a second working state;
wherein: 1. a high temperature side refrigeration system; 11. a high temperature side compressor; 12. an air cooler; 121. a first heat exchange conduit; 122. a heat exchange waterway; 13. a throttle valve; 14. a finned heat exchanger; 15. a first three-way valve; 151. a first valve port; 152. a second valve port; 153. a third valve port; 16. a second three-way valve; 161. a fourth valve port; 162. a fifth valve port; 163. a sixth valve port; 17. a first gas-liquid separator; 18. a first refrigerant line; 19. a third refrigerant line;
2. a low temperature side refrigeration system; 21. a low temperature side compressor; 22. a heat regenerator; 221. a second heat exchange conduit; 222. a third heat exchange conduit; 23. an evaporator; 24. a second gas-liquid separator; 25. a second refrigerant line; 26. an expansion valve;
3. an evaporative condenser; 31. a fourth heat exchange conduit; 32. a fifth heat exchange conduit.
Detailed Description
To explain the technical content, structural features, achieved objects and functions of the present invention in detail, the following detailed description is made with reference to the accompanying drawings.
As shown in fig. 1-2, the direct-current variable-frequency cascade carbon dioxide heat pump unit includes a high-temperature-side refrigeration system 1, a low-temperature-side refrigeration system 2, and an evaporative condenser 3, and heat is exchanged between the high-temperature-side refrigeration system 1 and the low-temperature-side refrigeration system 2 through the evaporative condenser 3, so that the low-temperature-side refrigeration system 2 supplies heat for high-temperature-side refrigeration.
Among them, the high temperature side refrigeration system 1 uses freon as a refrigerant, and specifically, R134A, R404A, R152, and the like can be used. The high-temperature side heat exchanger comprises a high-temperature side compressor 11, an air cooler 12, a throttle valve 13, a fin heat exchanger 14, a first three-way valve 15 and a second three-way valve 16, wherein a first heat exchange pipeline 121 and a heat exchange water channel 122 which exchange heat mutually are arranged inside the air cooler 12, the first three-way valve 15 is provided with a first valve port 151, a second valve port 152 and a third valve port 153, and the second three-way valve 16 is provided with a fourth valve port 161, a fifth valve port 162 and a sixth valve port 163. The low-temperature side refrigeration system 2 uses carbon dioxide as a refrigerant, and comprises a low-temperature side compressor 21, a heat regenerator 22 and an evaporator 23, wherein the low-temperature side compressor 21 is a direct-current variable-frequency compressor, and a second heat exchange pipeline 221 and a third heat exchange pipeline 222 which exchange heat with each other are arranged inside the heat regenerator 22. The evaporative condenser 3 is used as an intermediate heat exchange structure of the two refrigeration systems, and a fourth heat exchange pipeline 31 and a fifth heat exchange pipeline 32 which exchange heat with each other are arranged in the evaporative condenser.
The direct-current variable-frequency cascade carbon dioxide heat pump unit has a first working state lower than a set temperature and a second working state higher than the set temperature, wherein the set temperature is-25 ℃ to-30 ℃.
As shown in fig. 1, in the first operating state, that is, when the external environment temperature is lower than the set temperature, the first valve port 151 and the third valve port 153 of the first three-way valve 15 are communicated with each other, the fifth valve port 162 and the sixth valve port 163 of the second three-way valve 16 are communicated with each other, the high-temperature-side compressor 11, the first heat-exchange pipe 121, the throttle valve 13, the first valve port 151, the third valve port 153, the fourth heat-exchange pipe 31, the fifth valve port 162, and the sixth valve port 163 are communicated with each other sequentially through the first refrigerant pipe 18 to form a first circuit for circulating the freon refrigerant, and the low-temperature-side compressor 21, the fifth heat-exchange pipe 32, the second heat-exchange pipe 221, the expansion valve 26, the evaporator 23, and the third heat-exchange pipe 222 are communicated sequentially through the second refrigerant pipe 25 to form a second; the specific working principle is that, in the high-temperature side refrigeration system 1, after the freon refrigerant is compressed and does work by the high-temperature side compressor 11, the freon refrigerant becomes high-temperature and high-pressure gas and enters one side of the air cooler 12, the heat exchange is carried out through the first heat exchange pipeline 121 and the heat exchange waterway 122 of the user side, most of the heat is transferred to the heat exchange waterway 122, so that the required hot water is supplied to the user side, the freon refrigerant is throttled by the throttle valve 13 and then enters the evaporative condenser 3, the heat exchange is carried out through the fourth heat exchange pipeline 31 and the fifth heat exchange pipeline 32, the heat of the carbon dioxide refrigerant in the fifth heat exchange pipeline 32 is absorbed, and finally the freon refrigerant returns to the high-temperature side compressor 11. In the low-temperature refrigeration system, the carbon dioxide refrigerant is compressed by the low-temperature side compressor 21 to do work, then turns into high-temperature and high-pressure gas, enters the evaporative condenser 3, exchanges heat with the fourth heat exchange pipeline 31 through the fifth heat exchange pipeline 32, transfers most of heat carried by the carbon dioxide refrigerant to the freon refrigerant in the fourth heat exchange pipeline 31, supplies heat to the high-temperature side refrigeration system 1, then sequentially enters the evaporator 23 through the second heat exchange pipeline 221 of the heat regenerator 22 and the expansion valve 26, enters the heat regenerator 22 again after absorbing heat in the external environment through the evaporator 23, exchanges heat through the third heat exchange pipeline 222 and the second heat exchange pipeline 221, and returns to the low-temperature side compressor 21 after being heated again, thereby completing the circulation of the carbon dioxide refrigerant.
As shown in fig. 2, in the second operation state, that is, when the outside ambient temperature is higher than the set temperature, the first valve port 151 and the second valve port 152 of the first three-way valve 15 are communicated with each other, the fourth valve port 161 and the sixth valve port 163 of the second three-way valve 16 are communicated with each other, the high temperature side compressor 11, the first heat exchange tube 121, the throttle valve 13, the first valve port 151, the second valve port 152, the fin heat exchanger 14, the fourth valve port 161, and the sixth valve port 163 are communicated with each other through the third refrigerant tube 19 in order to form a third circuit in which the freon refrigerant circulates, and the low temperature side refrigeration system 2 stops operating. At the moment, only the high-temperature side refrigerating system 1 works, and the low-temperature side refrigerating system 2 stops working, so that the energy consumption of the whole heat pump unit is reduced; the high-temperature-side refrigeration system 1 absorbs heat in the external environment through the fin heat exchanger 14, and can meet the heat supply requirement of the user-side heat exchange water path 122.
In order to filter impurities, the high temperature side refrigeration system 1 further includes a first gas-liquid separator 17, and one end of the first gas-liquid separator 17 communicates with the intake port of the high temperature side compressor 11 and the other end communicates with the sixth valve port 163. The low temperature side refrigeration system 2 further includes a second gas-liquid separator 24, one end of the second gas-liquid separator 24 is communicated with the gas inlet of the low temperature side compressor 21, and the other end is communicated with the outlet of the third heat exchange pipe 222.
To simplify the piping design, the first refrigerant line 18 and the third refrigerant line 19 partially overlap. Specifically, the first refrigerant line 18 and the third refrigerant line 19 have two overlapping sections, one of which is a path portion from the outlet of the high temperature side compressor 11 to the first valve port 151, and the other of which is a path portion from the sixth valve port 163 to the inlet of the high temperature side compressor 11.
When the environmental temperature is lower than minus 25 ℃ to minus 30 ℃, the single-stage carbon dioxide heat pump unit is easy to reduce the heating capacity and cannot meet the condition of supplying heat for a heat exchange water path of a user terminal. By adopting the two refrigeration systems, the high-temperature side refrigeration system supplies heat to the heat exchange waterway at the user side, and the low-temperature side refrigeration system supplies heat to the high-temperature side refrigeration system through the evaporative condenser, so that the heat pump unit can adapt to extremely cold environment, even under the environment temperature of minus 40 ℃, the heat pump unit can still work normally, and has good heating performance and stable operation. And the low-temperature side compressor adopts a direct-current variable-frequency compressor, and the input power of the low-temperature side compressor is reduced and the energy consumption of the heat pump unit is reduced by controlling the working frequency of the low-temperature side compressor.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (6)
1. The utility model provides a direct current frequency conversion overlapping carbon dioxide heat pump set which characterized in that includes:
the high-temperature side refrigeration system (1) comprises a high-temperature side compressor (11), an air cooler (12), a throttle valve (13), a fin heat exchanger (14), a first three-way valve (15) and a second three-way valve (16), wherein a first heat exchange pipeline (121) and a heat exchange water channel (122) which exchange heat mutually are arranged in the air cooler (12), the first three-way valve (15) is provided with a first valve port (151), a second valve port (152) and a third valve port (153), and the second three-way valve (16) is provided with a fourth valve port (161), a fifth valve port (162) and a sixth valve port (163);
the low-temperature side refrigerating system (2) comprises a low-temperature side compressor (21), a heat regenerator (22), an evaporator (23) and an expansion valve (26), wherein the low-temperature side compressor (21) is a direct-current variable-frequency compressor, and a second heat exchange pipeline (221) and a third heat exchange pipeline (222) which exchange heat with each other are arranged in the heat regenerator (22);
the evaporative condenser (3) is internally provided with a fourth heat exchange pipeline (31) and a fifth heat exchange pipeline (32) which exchange heat with each other;
the direct-current frequency conversion cascade carbon dioxide heat pump unit has a first working state lower than a set temperature and a second working state higher than the set temperature, in the first working state, the first valve port (151) and the third valve port (153) are communicated, the fifth valve port (162) and the sixth valve port (163) are communicated, the high-temperature side compressor (11), the first heat exchange pipeline (121), the throttle valve (13), the first valve port (151), the third valve port (153), the fourth heat exchange pipeline (31), the fifth valve port (162) and the sixth valve port (163) are communicated with each other sequentially through the first refrigerant pipeline (18) to form a first loop for circulating Freon refrigerant, and the low-temperature side compressor (21), the fifth heat exchange pipeline (32), the second heat exchange pipeline (221), the expansion valve (26), the evaporator (23) and the third heat exchange pipeline (222) are communicated sequentially through the second refrigerant pipeline (25) to form a first loop for circulating carbon dioxide A second circuit in which a refrigerant circulates; in the second working state, the first valve port (151) and the second valve port (152) are communicated, the fourth valve port (161) and the sixth valve port (163) are communicated, the high-temperature side compressor (11), the first heat exchange pipeline (121), the throttle valve (13), the first valve port (151), the second valve port (152), the fin heat exchanger (14), the fourth valve port (161) and the sixth valve port (163) are communicated with one another sequentially through a third refrigerant pipeline (19) to form a third loop for circulating Freon refrigerant, and the low-temperature side refrigeration system (2) stops working.
2. The direct-current frequency conversion overlapping carbon dioxide heat pump unit according to claim 1, characterized in that: the compressor also comprises a first gas-liquid separator (17), one end part of the first gas-liquid separator (17) is communicated with the air inlet of the high-temperature side compressor (11), and the other end part of the first gas-liquid separator (17) is communicated with the sixth valve port (163).
3. The direct-current frequency conversion overlapping carbon dioxide heat pump unit according to claim 1, characterized in that: the heat exchanger further comprises a second gas-liquid separator (24), one end of the second gas-liquid separator (24) is communicated with the gas inlet of the low-temperature side compressor (21), and the other end of the second gas-liquid separator is communicated with the outlet of the third heat exchange pipeline (222).
4. The direct-current frequency conversion overlapping carbon dioxide heat pump unit according to claim 1, characterized in that: the first refrigerant line (18) and the third refrigerant line (19) partially overlap.
5. The direct-current frequency conversion overlapping carbon dioxide heat pump unit according to claim 4, characterized in that: the first refrigerant line (18) and the third refrigerant line (19) have two overlapping sections, wherein one of the overlapping sections is a path portion from the outlet of the high temperature side compressor (11) to the first valve port (151), and the other overlapping section is a path portion from the sixth valve port (163) to the inlet of the high temperature side compressor (11).
6. The direct-current frequency conversion overlapping carbon dioxide heat pump unit according to claim 1, characterized in that: the set temperature is-25 ℃ to-30 ℃.
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| CN110631289A (en) * | 2019-06-28 | 2019-12-31 | 江苏雪龙新能源科技有限公司 | Direct-current frequency conversion overlapping carbon dioxide heat pump unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110631289A (en) * | 2019-06-28 | 2019-12-31 | 江苏雪龙新能源科技有限公司 | Direct-current frequency conversion overlapping carbon dioxide heat pump unit |
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