CN211233445U - Direct-current variable-frequency carbon dioxide heat pump cold and hot unit - Google Patents
Direct-current variable-frequency carbon dioxide heat pump cold and hot unit Download PDFInfo
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- CN211233445U CN211233445U CN201921772967.6U CN201921772967U CN211233445U CN 211233445 U CN211233445 U CN 211233445U CN 201921772967 U CN201921772967 U CN 201921772967U CN 211233445 U CN211233445 U CN 211233445U
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Abstract
The utility model discloses a cold and hot unit of direct current frequency conversion carbon dioxide heat pump, which comprises a compressor, the air cooler, first expansion valve, the second expansion valve, the evaporimeter, cross valve and tonifying qi increase enthalpy heat exchanger, inside first heat transfer passageway and the heat transfer water route that has mutual heat transfer of air cooler, the inside second heat transfer pipeline and the third heat transfer pipeline that has mutual heat transfer of tonifying qi increase enthalpy heat exchanger, the compressor is direct current frequency conversion compressor, the switching of each valve port through control cross valve realizes the conversion of heat pump unit heating mode and refrigeration mode, under the heating mode, the compressor, first valve port, the fourth valve port, first heat transfer pipeline, second heat transfer pipeline, first expansion valve, the evaporimeter, the third valve port, the second valve port is linked together through the refrigerant pipeline in proper order, under the refrigeration mode, the compressor, first valve port, the third valve port, the evaporimeter, the compressor, the valve port, The first expansion valve, the second heat exchange pipeline, the first heat exchange pipeline, the fourth valve port and the second valve port are communicated in sequence through refrigerant pipelines.
Description
Technical Field
The utility model belongs to the technical field of the carbon dioxide heat pump, in particular to direct current frequency conversion carbon dioxide heat pump cold and hot unit.
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 comprises a compressor, an air cooler, an expansion valve and an evaporator which are sequentially connected through a refrigerant pipeline, wherein the refrigerant pipeline can exchange heat with a water channel at a user end on the air cooler side, so that hot water is supplied to a user, the single-stage carbon dioxide heat pump unit can normally work at about-25 ℃, and has the characteristic of high primary outlet water temperature, and the single outlet water temperature is as high as 90 ℃. However, the existing carbon dioxide heat pump generally has no cold and hot continuous supply type unit, namely, the heat pump can not realize heat supply and refrigeration like an air conditioner, and the application range is single.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model aims at providing a both can realize heating and can realize refrigeration, the more extensive direct current frequency conversion carbon dioxide heat pump cold and hot unit of range of application.
In order to realize the purpose of the utility model, the utility model adopts the following technical scheme:
a direct current frequency conversion carbon dioxide heat pump cooling and heating unit comprises:
a compressor;
the air cooler is internally provided with a first heat exchange pipeline and a heat exchange water path which exchange heat with each other;
a first expansion valve;
an evaporator; it is characterized in that the direct-current frequency conversion carbon dioxide heat pump cold and hot unit also comprises a heat pump,
a four-way valve disposed between the compressor and the air cooler, the four-way valve having a first valve port, a second valve port, a third valve port, and a fourth valve port;
the air-supplying enthalpy-increasing heat exchanger is arranged between the air cooler and the first expansion valve, a second heat exchange pipeline and a third heat exchange pipeline which exchange heat with each other are arranged in the air-supplying enthalpy-increasing heat exchanger, one end part of the third heat exchange pipeline is communicated with the second heat exchange pipeline, the other end part of the third heat exchange pipeline is communicated with an air inlet of the compressor, and a second expansion valve is arranged between the second heat exchange pipeline and the third heat exchange pipeline;
the compressor is a direct-current variable-frequency compressor, the direct-current variable-frequency carbon dioxide heat pump cold and hot unit has a heating mode and a cooling mode, in the heating mode, the first valve port is communicated with the fourth valve port, the second valve port is communicated with the third valve port, the first expansion valve and the second expansion valve are both in an open state, the compressor, the first valve port, the fourth valve port, the first heat exchange pipeline, the second heat exchange pipeline, the first expansion valve, the evaporator, the third valve port and the second valve port are sequentially communicated through a refrigerant pipeline to form a heating loop for circulating a carbon dioxide refrigerant, and part of the carbon dioxide refrigerant sequentially returns to the compressor through the second heat exchange pipeline, the second expansion valve and the third heat exchange pipeline to form an air supplementing loop;
in the refrigeration mode, the first valve port is communicated with the third valve port, the second valve port is communicated with the fourth valve port, the first expansion valve is in an open state, the second expansion valve is in a closed state, and the compressor, the first valve port, the third valve port, the evaporator, the first expansion valve, the second heat exchange pipeline, the first heat exchange pipeline, the fourth valve port and the second valve port are sequentially communicated through a refrigerant pipeline to form a refrigeration loop for circulating carbon dioxide refrigerant.
In the above technical solution, preferably, the oil separator further includes an inlet, an outlet and an oil discharge port, the inlet of the oil separator is communicated with the air outlet of the compressor, the outlet of the oil separator is communicated with the first valve port, and the oil discharge port of the oil separator is communicated with the oil return port of the compressor.
In the above technical solution, it is preferable that the valve further includes a gas-liquid separator, and the gas-liquid separator communicates the second valve port and the air inlet of the compressor.
The utility model realizes the conversion between the heating mode and the refrigerating mode by respectively controlling the opening and closing of each valve port by arranging the four-way valve, can realize that the carbon dioxide heat pump unit has the functions of heating and refrigerating at the same time, and has wider application range; by arranging the air-supplementing enthalpy-increasing heat exchanger and the second expansion valve, air is supplemented to the compressor by opening the second expansion valve in the heating mode, the compression ratio of the unit is reduced, and the energy efficiency and the heating performance are improved; the variable frequency compressor replaces the traditional fixed frequency compressor, the working frequency of the compressor can be controlled, the input power of the compressor is reduced, and the energy consumption of a unit is reduced.
Drawings
FIG. 1 is a structural schematic diagram of the direct-current variable-frequency carbon dioxide heat pump cooling and heating unit of the present invention in the heating mode;
fig. 2 is a structural schematic diagram of the direct-current variable-frequency carbon dioxide heat pump cold and hot unit of the present invention in the refrigeration mode;
wherein: 11. a compressor; 12. an air cooler; 121. a first heat exchange conduit; 122. a heat exchange waterway; 13. a first expansion valve; 14. an evaporator; 15. a four-way valve; 151. a first valve port; 152. a second valve port; 153. a third valve port; 154. a fourth valve port; 16. a vapor-supplementing enthalpy-increasing heat exchanger; 161. a second heat exchange conduit; 162. a third heat exchange conduit; 17. a second expansion valve; 18. an oil separator; 19. a gas-liquid separator.
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 carbon dioxide heat pump cooling and heating unit includes a compressor 11, a four-way valve 15, an air cooler 12, an air-make-up enthalpy-increasing heat exchanger 16, a first expansion valve 13, a second expansion valve 17, and an evaporator 14.
Wherein, the compressor 11 is a DC variable frequency compressor 11. The four-way valve 15 is disposed between the compressor 11 and the air cooler 12, and has a first port 151, a second port 152, a third port 153, and a fourth port 154. The air cooler 12 has a first heat exchange pipe 121 and a heat exchange water path 122 inside for exchanging heat with each other. The air-supplement enthalpy-increasing heat exchanger 16 is disposed between the air cooler 12 and the first expansion valve 13, a second heat exchange pipe 161 and a third heat exchange pipe 162 for exchanging heat with each other are disposed inside the air-supplement enthalpy-increasing heat exchanger 16, one end of the third heat exchange pipe 162 is communicated with the second heat exchange pipe 161, the other end is communicated with an air inlet of the compressor 11, and the second expansion valve 17 is disposed between the second heat exchange pipe 161 and the third heat exchange pipe 162.
As shown in fig. 1, in the heating mode, the first valve port 151 and the fourth valve port 154 are communicated, the second valve port 152 and the third valve port 153 are communicated, the first expansion valve 13 and the second expansion valve 17 are both in an open state, the compressor 11, the first valve port 151, the fourth valve port 154, the first heat exchange pipe 121, the second heat exchange pipe 161, the first expansion valve 13, the evaporator 14, the third valve port 153, and the second valve port 152 are sequentially communicated through a refrigerant pipe to form a heating circuit for circulating a carbon dioxide refrigerant, and a part of the carbon dioxide refrigerant is sequentially returned to the compressor 11 through the second heat exchange pipe 161, the second expansion valve 17, and the third heat exchange pipe 162 to form a gas supplementing circuit. The specific working principle is that the carbon dioxide refrigerant is compressed by the compressor 11 to work and then turns into high-temperature and high-pressure gas, and the gas enters the first heat exchange pipeline 121 of the air cooler 12 after passing through the first valve port 151 and the fourth valve port 154 of the four-way valve 15, and exchanges heat with the heat exchange waterway 122 through the first heat exchange pipeline 121, so that most of the heat is transferred to the heat exchange waterway 122 to supply the required hot water to the user side; then, the carbon dioxide refrigerant enters the second heat exchange pipeline 161 of the air-supply enthalpy-increasing heat exchanger 16, and is divided into two paths after coming out of the second heat exchange pipeline 161, one path of carbon dioxide refrigerant enters the evaporator 14 after passing through the first expansion valve 13, and exchanges heat with the external environment through the evaporator 14, absorbs heat in the external environment to increase the temperature, and finally returns to the compressor 11, so that the heating cycle process of the carbon dioxide refrigerant is completed. The other path of carbon dioxide refrigerant from the second heat exchange pipeline 161 enters the third heat exchange pipeline 162 of the air-supplementing enthalpy-increasing heat exchanger 16 through the second expansion valve 17, exchanges heat with the carbon dioxide refrigerant in the second heat exchange pipeline 161, absorbs heat, and returns to the compressor 11, so that the air-supplementing process is completed. In the process, the air supply loop is added, so that the air inflow of the compressor 11 is increased, the compression ratio of the heat pump unit can be reduced on the whole, more heating capacity is obtained, the heating performance of the heat pump unit is improved, and the air supply heat pump unit is very suitable for being applied in extremely cold areas or environments requiring high-temperature water.
As shown in fig. 2, in the cooling mode, the first valve port 151 and the third valve port 153 are communicated, the second valve port 152 and the fourth valve port 154 are communicated, the first expansion valve 13 is in an open state, the second expansion valve 17 is in a closed state, and the compressor 11, the first valve port 151, the third valve port 153, the evaporator 14, the first expansion valve 13, the second heat exchange pipe 161, the first heat exchange pipe 121, the fourth valve port 154, and the second valve port 152 are sequentially communicated through a refrigerant pipe to form a cooling circuit for circulating a carbon dioxide refrigerant. The specific working principle is that the carbon dioxide refrigerant is compressed by the compressor 11 to work and then changed into high-temperature and high-pressure gas, and the gas enters the evaporator 14 through the first valve port 151 and the third valve port 153, and exchanges heat with the external environment through the evaporator 14, most of the heat carried by the gas is dissipated to the external environment, the temperature is reduced, the gas enters the second heat exchange pipeline 161 of the gas-supplementing enthalpy-increasing heat exchanger 16 through the first expansion valve 13, the carbon dioxide refrigerant coming out of the second heat exchange pipeline 161 enters the first heat exchange pipeline 121 of the gas cooler 12, and exchanges cold through the first heat exchange pipeline 121 and the heat exchange water path 122, so as to absorb the heat of the heat exchange water path 122, so that the water in the heat exchange water path 122 is cooled, chilled water can be supplied to a user, and the heat exchanged carbon dioxide refrigerant returns to the compressor 11 after sequentially passing through the fourth valve port 154 and the second valve port 152 of the four, so as to complete the refrigeration cycle process of the carbon dioxide refrigerant.
In order to separate a small amount of lubricating oil mixed into the carbon dioxide refrigerant during the compression operation of the compressor 11 and to enable the lubricating oil to participate in the lubricating operation of the internal components of the compressor 11 again, an oil separator 18 is further disposed between the compressor 11 and the four-way valve 15, the oil separator 18 has an inlet, an outlet and an oil discharge port, the outlet of the oil separator 18 is communicated with the first valve port 151 of the four-way valve 15, and the oil discharge port of the oil separator 18 is communicated with the oil return port of the compressor 11.
In order to filter impurities, a gas-liquid separator 19 is further provided between the four-way valve 15 and the compressor 11, and the gas-liquid separator 19 communicates the second valve port 152 with the air inlet of the compressor 11.
No matter the direct current frequency conversion carbon dioxide heat pump cold and hot unit of this scheme is under the mode of heating or under the mode of refrigeration, all adopt direct current frequency conversion compressor to replace traditional fixed frequency compressor to control the operating frequency of compressor, make its input power reduce, the energy consumption is littleer.
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 (3)
1. A direct current frequency conversion carbon dioxide heat pump cooling and heating unit comprises:
a compressor (11);
the air cooler (12) is internally provided with a first heat exchange pipeline (121) and a heat exchange water path (122) which exchange heat with each other;
a first expansion valve (13);
an evaporator (14); it is characterized in that the direct-current frequency conversion carbon dioxide heat pump cold and hot unit also comprises a heat pump,
a four-way valve (15) disposed between the compressor (11) and the air cooler (12), the four-way valve (15) having a first port (151), a second port (152), a third port (153), and a fourth port (154);
the air-supplying enthalpy-increasing heat exchanger (16) is arranged between the air cooler (12) and the first expansion valve (13), a second heat exchange pipeline (161) and a third heat exchange pipeline (162) which exchange heat with each other are arranged in the air-supplying enthalpy-increasing heat exchanger (16), one end part of the third heat exchange pipeline (162) is communicated with the second heat exchange pipeline (161), the other end part of the third heat exchange pipeline is communicated with an air inlet of the compressor (11), and a second expansion valve (17) is arranged between the second heat exchange pipeline (161) and the third heat exchange pipeline (162);
the compressor (11) is a direct-current variable-frequency compressor, the direct-current variable-frequency carbon dioxide heat pump chiller-heater unit has a heating mode and a cooling mode, in the heating mode, the first valve port (151) and the fourth valve port (154) are communicated, the second valve port (152) and the third valve port (153) are communicated, the first expansion valve (13) and the second expansion valve (17) are both in an open state, the compressor (11), the first valve port (151), the fourth valve port (154), the first heat exchange pipeline (121), the second heat exchange pipeline (161), the first expansion valve (13), the evaporator (14), the third valve port (153) and the second valve port (152) are sequentially communicated through refrigerant pipelines to form a heating loop for circulating carbon dioxide refrigerant, and part of the carbon dioxide heat exchange refrigerant sequentially passes through the second heat exchange pipeline (161), the first expansion valve (13), the evaporator (14), the third valve port (153) and the second valve port (152), The second expansion valve (17) and the third heat exchange pipeline (162) return to the compressor (11) to form a gas supplementing loop;
in the refrigeration mode, the first valve port (151) and the third valve port (153) are communicated, the second valve port (152) and the fourth valve port (154) are communicated, the first expansion valve (13) is in an open state, the second expansion valve (17) is in a closed state, and the compressor (11), the first valve port (151), the third valve port (153), the evaporator (14), the first expansion valve (13), the second heat exchange pipeline (161), the first heat exchange pipeline (121), the fourth valve port (154) and the second valve port (152) are sequentially communicated through refrigerant pipelines to form a refrigeration loop for carbon dioxide refrigerant circulation.
2. The direct-current variable-frequency carbon dioxide heat pump cooling and heating unit according to claim 1, characterized in that: the oil separator (18) is provided with an inlet, an outlet and an oil outlet, the inlet of the oil separator (18) is communicated with the air outlet of the compressor (11), the outlet of the oil separator (18) is communicated with the first valve port (151), and the oil outlet of the oil separator (18) is communicated with the oil return port of the compressor (11).
3. The direct-current variable-frequency carbon dioxide heat pump cooling and heating unit according to claim 1, characterized in that: the gas-liquid separator (19) is further included, and the gas-liquid separator (19) is communicated with the second valve port (152) and the air inlet of the compressor (11).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201920993872 | 2019-06-28 | ||
| CN2019209938720 | 2019-06-28 |
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| CN211233445U true CN211233445U (en) | 2020-08-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110645736A (en) * | 2019-06-28 | 2020-01-03 | 江苏雪龙新能源科技有限公司 | Direct-current variable-frequency carbon dioxide heat pump cold and hot unit |
| CN114815927A (en) * | 2022-05-24 | 2022-07-29 | 国网江苏省电力有限公司泰州供电分公司 | Large power supply temperature control system of power distribution station |
-
2019
- 2019-10-22 CN CN201921772967.6U patent/CN211233445U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110645736A (en) * | 2019-06-28 | 2020-01-03 | 江苏雪龙新能源科技有限公司 | Direct-current variable-frequency carbon dioxide heat pump cold and hot unit |
| CN114815927A (en) * | 2022-05-24 | 2022-07-29 | 国网江苏省电力有限公司泰州供电分公司 | Large power supply temperature control system of power distribution station |
| CN114815927B (en) * | 2022-05-24 | 2024-01-09 | 国网江苏省电力有限公司泰州供电分公司 | Large-scale power supply temperature control system of power distribution station |
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