CN216592316U - Heat pump set with large-pressure ratio and small-pressure ratio switching - Google Patents
Heat pump set with large-pressure ratio and small-pressure ratio switching Download PDFInfo
- Publication number
- CN216592316U CN216592316U CN202122497213.8U CN202122497213U CN216592316U CN 216592316 U CN216592316 U CN 216592316U CN 202122497213 U CN202122497213 U CN 202122497213U CN 216592316 U CN216592316 U CN 216592316U
- Authority
- CN
- China
- Prior art keywords
- compressor
- pressure ratio
- way valve
- valve
- heat pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The utility model discloses a heat pump unit with a large-pressure ratio and a small-pressure ratio, which comprises two compressors, wherein the two compressors are connected through a pipeline to form a circulation loop; at least three electromagnetic valves are connected to pipelines of the first compressor and the second compressor; the first electromagnetic valve is connected between the output ends of the first compressor and the second compressor, the second electromagnetic valve is connected between the output end of the first compressor and the input end of the second compressor, and the third electromagnetic valve is connected between the input ends of the first compressor and the second compressor. The heat pump unit with the large and small pressure ratio switching is reformed through different process principles, the pressure ratio change range of the heat pump unit is effectively enlarged, the problem of energy efficiency improvement of refrigeration and heating is solved, and the heat pump unit is used for refrigerating in summer and heating in winter.
Description
Technical Field
The utility model belongs to the technical field of heat pumps, and particularly relates to a heat pump unit with a large-pressure ratio and a small-pressure ratio switching function.
Background
The heat pump is an important device for clean heating and refrigeration in China, is the most efficient device for converting electricity into heat (cold), and has a huge market prospect under the large background of carbon peak reaching, carbon neutralization and building electrification.
In the traditional heat pump technology, when the heat pump works in winter, because the outdoor environment temperature is very low (about-25 ℃), in order to meet the heating effect and the normal operation of a unit, quasi-two-stage compression or two-stage compression is often needed, and the heat pump works in a high-pressure ratio (the pressure ratio is about 10.0) meeting the heating requirement; in summer, the pressure ratio is small (usually about 4.0) because the outdoor environment temperature is about 35 ℃. In the traditional technology, the pressure ratio of a refrigerating system is adjusted through technologies such as changing the volume of a single compressor, so that the requirements of different working conditions of a heat pump unit are met, the dynamic load fluctuation of a building is met, and the high seasonal energy efficiency ratio of equipment is realized. However, the energy efficiency of both cooling and heating is often required, so that the pressure ratio adjustment range is limited, and the energy efficiency of the equipment is reduced.
Disclosure of Invention
In view of the above technical problems in the prior art, an object of the present invention is to provide a heat pump unit with switchable pressure ratios.
In order to realize the task, the utility model adopts the following technical solution:
a heat pump unit with switching of large and small pressure ratios comprises two compressors which are connected through a pipeline to form a circulation loop; the system is characterized in that at least three electromagnetic valves are connected to pipelines of the first compressor and the second compressor; the first electromagnetic valve is connected between the output ends of the first compressor and the second compressor, the second electromagnetic valve is connected between the output end of the first compressor and the input end of the second compressor, and the third electromagnetic valve is connected between the input ends of the first compressor and the second compressor.
A heat pump unit capable of realizing switching of large-pressure ratio and small-pressure ratio comprises two compressors, wherein the two compressors are connected through a pipeline to form a circulation loop; the compressor is characterized in that two three-way valves are connected to pipelines of the two compressors, wherein one interface of the first three-way valve is connected to the output end of the first compressor, one interface of the second three-way valve is connected to the input end of the second compressor, and one interface of the first three-way valve is connected with one interface of the second three-way valve through the pipeline.
Other characteristics of the utility model are:
the system also comprises a fourth electromagnetic valve, a four-way valve, a pair of heat exchangers, a pair of electronic expansion valves, a one-way valve, a three-way valve and an intercooler which are additionally arranged on the pipeline; wherein:
one interface of the four-way valve is connected with the input ends of the first compressor and the second compressor, one interface of the four-way valve is connected with the output ends of the first compressor and the second compressor, and one interface of the four-way valve is respectively connected with the intercooler and the first electronic expansion valve through the first heat exchanger; the first electronic expansion valve is connected with the intercooler through a fourth electromagnetic valve, one port of the intercooler is communicated with the second heat exchanger through the second electronic expansion valve, the second heat exchanger and the three-way valve, and the second heat exchanger is connected to one interface of the four-way valve; one interface of the three-way valve is communicated with the first electronic expansion valve through a one-way valve; the other end of the intercooler is connected to the input end of the second compressor through a second electromagnetic valve.
The heat pump unit with the switching of the large pressure ratio and the small pressure ratio is reformed through different process principles, the pressure ratio change range of the heat pump unit is effectively expanded, the problem of energy efficiency improvement of both refrigeration and heating is solved, and the heat pump unit is used for refrigerating in summer and heating in winter.
Drawings
FIG. 1 is a schematic diagram of parallel operation of heat pump units with switching of the large and small pressure ratios according to example 1 (small pressure ratio);
FIG. 2 is a schematic diagram of the series operation of the heat pump units with the switching of the large and small pressure ratios in example 2 (large pressure ratio);
FIG. 3 is a first alternate operation schematic diagram of the heat pump unit with the switching of the pressure ratio of the heat pump units according to embodiment 3;
FIG. 4 is a second alternate operation schematic diagram of the heat pump unit with the switching of the pressure ratio in the embodiment 3;
FIG. 5 is a schematic diagram of the parallel operation of the heat pump units with the switching of the pressure ratios in embodiment 4 (switching of the double three-way valves);
FIG. 6 is a schematic diagram of the series operation of the heat pump units with the switching of the pressure ratios in embodiment 4 (switching of the double three-way valves);
FIG. 7 is a schematic diagram of the series operation of the heat pump units of embodiment 5 with the switching of the pressure ratio in winter under the low-temperature heating condition;
FIG. 8 is a schematic diagram of the parallel operation of the heat pump units of embodiment 5 with the switching of the pressure ratio in winter under the low-temperature heating condition;
FIG. 9 is a schematic diagram of the parallel operation of the heat pump units of embodiment 6 with the switching of the pressure ratio in summer;
the symbols in the figures represent: 1. the system comprises a first compressor, a second compressor, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve, a fifth electromagnetic valve, a fourth compressor, a fourth electromagnetic valve, a fourth compressor, a.
The utility model is described in further detail below with reference to the following figures and examples, as well as the principles of operation.
Detailed Description
Example 1:
referring to fig. 1, the present embodiment provides a heat pump unit with switching between a first pressure ratio and a second pressure ratio, which includes a first compressor 1, a second compressor 2, a first electromagnetic valve 3a, a second electromagnetic valve 3b, and a third electromagnetic valve 3 c; the first solenoid valve 3a is connected between the output terminals of the first and second compressors 1 and 2, the second solenoid valve 3b is connected between the output terminals of the first and second compressors 1 and 2, and the third solenoid valve 3c is connected between the input terminals of the first and second compressors 1 and 2.
When the thermodynamic cycle pressure ratio is smaller than the requirement, the first compressor 1 and the second compressor 2 run in parallel, the first electromagnetic valve 3a and the third electromagnetic valve 3c are opened, the second electromagnetic valve 3b is closed, and the refrigerant flows to the first compressor 1 and the second compressor 2 respectively to perform thermodynamic cycle.
Example 2:
referring to fig. 2, the heat pump set structure and connection relationship of the present embodiment with switching between the large pressure ratio and the small pressure ratio are the same as those of embodiment 1, and different from embodiment 1, when the thermodynamic cycle pressure ratio is large, the first compressor 1 and the second compressor 2 are connected in series to operate through different process principle changes, the first electromagnetic valve 3a and the third electromagnetic valve 3c are closed, the second electromagnetic valve 3b is opened, and the refrigerant flows to the first compressor 1 and the second compressor 2 in sequence to perform thermodynamic cycle.
Example 3:
referring to fig. 3 and 4, the heat pump set with the switched high and low pressure ratios of the present embodiment has the same structure and connection relationship as those of embodiment 1, and is different from embodiment 1,
when the first compressor 1 is operated (fig. 3), the first solenoid valve 3a is opened, the second solenoid valve 3b and the third solenoid valve 3c are closed, and the refrigerant flows to the first compressor 1 and then is thermally circulated.
When the second compressor 2 is operated (fig. 4), the first solenoid valve 3a, the second solenoid valve 3b are closed, the third solenoid valve 3c is opened, and the refrigerant flows to the second compressor and then 2 to perform a thermodynamic cycle.
When the positions of the three solenoid valves (3a, 3b, 3c) are properly adjusted, the operating principle remains similar.
Example 4:
referring to fig. 5 and fig. 6, the heat pump set with switching between the large pressure ratio and the small pressure ratio is provided in this embodiment, and includes a first compressor 1, a second compressor 2, a first three-way valve 9a, and a second three-way valve 9 b; one interface of the first three-way valve 9a is connected with the output end of the first compressor 1, one interface of the second three-way valve 9b is connected with the input end of the second compressor 2, and one interface of the first three-way valve 9a is communicated with one interface of the second three-way valve 9b through a pipeline.
When the first compressor 1 and the second compressor 2 are operated in parallel (fig. 5), the first compressor 1 is operated, the first three-way valve 9a is opened, the second compressor 2 is operated, the second three-way valve 9b is opened, the first three-way valve 9a and the second three-way valve 9b are not communicated, and refrigerant flows respectively to the first compressor 1 and the second compressor 2 and then are connected in parallel to perform thermodynamic cycle.
When the first compressor 1 and the second compressor 2 are operated in series (fig. 6), the first compressor 1 is operated, the first three-way valve 9a is opened, the first three-way valve 9a and the second three-way valve 9b are communicated with each other, and the refrigerant flows to the second compressor 2 through the first three-way valve 9a and the second three-way valve 9b and then is subjected to thermodynamic cycle.
The heat pump unit with the switching of the large pressure ratio and the small pressure ratio can be used for various heat pump thermal cycle units such as a ground source heat pump unit, a heat source tower heat pump unit, an air source heat pump unit and the like.
Example 5:
referring to fig. 7 and 8, the heat pump unit with switching between the large pressure ratio and the small pressure ratio includes two compressors connected to form a circulation loop; the pipelines of the first compressor 1 and the second compressor 2 are connected with 4 electromagnetic valves (3a, 3b, 3c, 3 d); a four-way valve 4, a pair of heat exchangers (5a, 5b), a pair of electronic expansion valves (6a, 6b), a one-way valve 8, a three-way valve 9 and an intercooler 10; wherein, the first solenoid valve 3a is connected between the output terminals of the first compressor 1 and the second compressor 2, the second solenoid valve 3b is connected between the output terminal of the first compressor 1 and the input terminal of the second compressor 2, and the third solenoid valve 3c is connected between the input terminals of the first compressor 1 and the second compressor 2.
One interface of the four-way valve 4 is connected with the input ends of the first compressor 1 and the second compressor 2, one interface of the four-way valve 4 is connected with the output ends of the first compressor 1 and the second compressor 2, and one interface of the four-way valve 4 is respectively connected with the intercooler 10 and the first electronic expansion valve 6a through the first heat exchanger 5 a; the first electronic expansion valve 6a is connected with the intercooler 10 through the fourth electromagnetic valve 3d, one port of the intercooler 10 is communicated with the second heat exchanger 5b through the second electronic expansion valve 6b, the second heat exchanger 5b and the three-way valve 9, and the second heat exchanger 5b is connected to one interface of the four-way valve 4; one port of the three-way valve 9 is communicated with the first electronic expansion valve 6a through the one-way valve 8; the other end of the intercooler 10 is connected to the input end of the second compressor 2 through the second solenoid valve 3 b.
The principle of the normal heating working condition in winter is shown in figure 7: when the outdoor temperature is extremely low (such as Tibet, Beijing and the like, the coldest moment in winter reaches minus ten and more degrees or even lower), and when the outdoor temperature is extremely low in winter, the heat is supplied, along with the reduction of the evaporation pressure of the evaporation temperature, the suction pressure of the compressor is correspondingly reduced, the pressure ratio and the suction specific volume are increased, the increase of the pressure ratio of the compressor can cause the reduction of the volumetric efficiency of a compression mechanism, the reduction of the heating capacity of a heat pump, the increase of the exhaust temperature of the compressor, the failure of lubricating oil, the increase of the power consumption of the compressor and the like.
At the moment, the first compressor 1 and the second compressor 2 are operated in series to meet the requirement of a high pressure ratio, the first electromagnetic valve 3a and the third electromagnetic valve 3c are closed, the second electromagnetic valve 3b is opened, the refrigerant flows to the first compressor 1 and the second compressor 2 in sequence, is compressed into a high-temperature high-pressure refrigerant, is changed by the four-way valve 4, enters the first heat exchanger 5a, exchanges heat with indoor air or water, and at the moment, the first heat exchanger 5a is a condenser and releases heat to the indoor; the refrigerant after heat release is divided into two paths, one path of main path enters the inner side of a coil pipe of the intercooler 10, the other path of branch path enters the outer side of the coil pipe of the intercooler 5 after being subjected to pressure reduction through the first electronic expansion valve 6a, the refrigerant passing through the main path of the coil pipe is cooled, the supercooling degree of the refrigerant of the main path is improved, and the refrigerant enters a suction inlet of the second compressor 2 to be compressed again. The cooled main refrigerant enters the second electronic expansion valve 6b for throttling and pressure reduction, becomes a low-temperature and low-pressure refrigerant, enters the second heat exchanger 5b for absorbing heat from outdoor air, enters the first compressor 1, and continuously circulates in the way.
When the outdoor temperature is gradually increased in winter (for example, in the last stage of heating, the outdoor temperature is gradually increased to over 0 ℃, and the unit pressure ratio requirement is reduced), or although the heating requirement exists in winter, the outdoor temperature is not too low, and the requirement can be met by operating at a low pressure ratio, and the operation principle is as shown in fig. 8. At the moment, the first compressor 1 and the second compressor 2 run in parallel to meet the requirement of a small pressure ratio, the first electromagnetic valve 3a and the third electromagnetic valve 3c are opened, the second electromagnetic valve 3b is closed, and after the first compressor (1) and the high-temperature and high-pressure refrigerant compressed by the second compressor (2) are converged, the refrigerant is reversed by the four-way valve 4 and flows to the first heat exchanger 5a to release heat indoors. At this time, the fourth solenoid valve 3d is closed, the first electronic expansion valve 6a is closed, the refrigerant which has released heat enters the inner side of the coil of the intercooler 10 through the main path, is throttled by the second electronic expansion valve 6b to become a low-temperature and low-pressure refrigerant, enters the second heat exchanger 5b to absorb heat from outdoor air, enters the first compressor 1 and the second compressor 2, and thus is continuously circulated.
When a single compressor runs, on one hand, two compressors can take turns to take a rest to prolong the service life of the unit, and on the other hand, the compressor can adapt to a larger load adjusting range to obtain a better running effect.
The operation principle is that when the first compressor 1 operates, the first electromagnetic valve 3a is opened, the third electromagnetic valve 3c and the second electromagnetic valve 3b are closed, and the high-temperature and high-pressure refrigerant compressed by the first compressor 1 is reversed by the four-way valve 4 and flows to the first heat exchanger 5a to release heat indoors. At the moment, the fourth electromagnetic valve 3d is closed, the first electronic expansion valve 6a is closed, the heat-released refrigerant enters the inner side of the coil pipe of the intercooler 10 through the main path, is throttled by the second electronic expansion valve 6b to become a low-temperature and low-pressure refrigerant, enters the second heat exchanger 5b to absorb heat from outdoor air, enters the first compressor 1, and is circulated continuously; the principle is similar when the second compressor 2 is operated alternately.
Example 6:
the heat pump unit with the switching of the large and small pressure ratios in this embodiment has the same structure and connection relationship as those in embodiment 5.
When the outdoor temperature is hot in summer and the refrigerating capacity demand is large, the first compressor 1 and the second compressor 2 are operated in parallel, but the demand on the evaporation temperature is not too low at the moment, the pressure ratio of the compressors is not high in winter, and the small pressure ratio demand is met.
The operation principle is as shown in fig. 9, through the parallel operation of the 1 st compressor and the 2 nd compressor, the refrigerant flow is increased, on one hand, the refrigerating capacity is improved, on the other hand, the compressors are respectively operated under a proper pressure ratio, and the economical efficiency can be obviously improved.
When the first compressor 1 operates, the first electromagnetic valve 3a is opened, the second electromagnetic valve 3b and the third electromagnetic valve 3c are closed, direction change control is performed through the four-way valve 4, low-pressure low-temperature refrigerant steam generated by the first heat exchanger 5a flows to the first compressor 1, after the refrigerant is adiabatically compressed, the temperature and the pressure of the refrigerant are increased, the refrigerant flows to the second heat exchanger 5b to release heat and cool outdoors, the temperature of the refrigerant is reduced after the heat release and condensation of the refrigerant, the three-way valve 9 is switched, the refrigerant enters the 1 st electronic expansion valve 6a to be throttled and reduced in pressure after passing through the one-way valve 8, and the low-temperature low-pressure refrigerant enters the 1 st heat exchanger to absorb heat from indoors and then enters the 1 st compressor to be continuously circulated; the principle is similar when the 2 nd compression is operated.
When the refrigeration requirement is normal, but the requirement on the evaporation temperature is not too low at this time, the pressure ratio requirement on the compressor is not high in winter, and the compressor can be operated at a proper pressure ratio by operating only the 1 st compressor, so that the economy can be remarkably improved. The system can also be switched to the 2 nd compressor to enable the compressor to operate independently, and the running life of the unit can be greatly prolonged by alternate running;
in summary, the heat pump unit with switching of the large pressure ratio and the small pressure ratio can keep the pressure ratio of the compressor in a reasonable working condition all the time by switching the number of the compressors in working conditions with different refrigerating capacity requirements in winter and summer by changing the control idea, thereby improving the operation efficiency of the heat pump unit and reducing the power consumption of the compressors.
Claims (3)
1. A heat pump unit with switching of large and small pressure ratios comprises two compressors, wherein the two compressors are connected through a pipeline to form a circulation loop; the method is characterized in that at least three electromagnetic valves (3a, 3b, 3c) are connected to pipelines of the first compressor (1) and the second compressor (2); the first electromagnetic valve (3a) is connected between the output ends of the first compressor (1) and the second compressor (2), the second electromagnetic valve (3b) is connected between the output end of the first compressor (1) and the input end of the second compressor (2), and the third electromagnetic valve (3c) is connected between the input ends of the first compressor (1) and the second compressor (2).
2. The heat pump unit with the switching of the large pressure ratio and the small pressure ratio as claimed in claim 1, further comprising a fourth electromagnetic valve (3d), a four-way valve (4), a pair of heat exchangers (5a, 5b), a pair of electronic expansion valves (6a, 6b), a one-way valve (8), a three-way valve (9) and an intermediate cooler (10) which are additionally arranged on the pipeline; wherein:
one interface of the four-way valve (4) is connected with the input ends of the first compressor (1) and the second compressor (2), one interface of the four-way valve (4) is connected with the output ends of the first compressor (1) and the second compressor (2), and one interface of the four-way valve (4) is respectively connected with the intercooler (10) and the first electronic expansion valve (6a) through the first heat exchanger (5 a); the first electronic expansion valve (6a) is connected with an intercooler (10) through a fourth electromagnetic valve (3d), one port of the intercooler (10) is communicated with a second heat exchanger (5b) through a second electronic expansion valve (6b), the second heat exchanger (5b) and a three-way valve (9), and the second heat exchanger (5b) is connected to one interface of a four-way valve (4); one interface of the three-way valve (9) is communicated with the first electronic expansion valve (6a) through a one-way valve (8); the other end of the intercooler (10) is connected to the input end of the second compressor (2) through a second electromagnetic valve (3 b).
3. A heat pump unit with switching of large and small pressure ratios comprises two compressors, wherein the two compressors are connected through a pipeline to form a circulation loop; the compressor is characterized in that two three-way valves (9a, 9b) are connected to pipelines of the two compressors, wherein one interface of the first three-way valve (9a) is connected to the output end of the first compressor (1), one interface of the second three-way valve (9b) is connected to the input end of the second compressor (2), and one interface of the first three-way valve (9a) is communicated with one interface of the second three-way valve (9b) through a pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122497213.8U CN216592316U (en) | 2021-10-15 | 2021-10-15 | Heat pump set with large-pressure ratio and small-pressure ratio switching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122497213.8U CN216592316U (en) | 2021-10-15 | 2021-10-15 | Heat pump set with large-pressure ratio and small-pressure ratio switching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216592316U true CN216592316U (en) | 2022-05-24 |
Family
ID=81639173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122497213.8U Active CN216592316U (en) | 2021-10-15 | 2021-10-15 | Heat pump set with large-pressure ratio and small-pressure ratio switching |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216592316U (en) |
-
2021
- 2021-10-15 CN CN202122497213.8U patent/CN216592316U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111780444B (en) | Vapor compression cascade heat pump cycle and single-stage heat pump cycle combined system | |
| CN108278793B (en) | Heat pump system capable of realizing variable flow single-stage compression cycle and cascade cycle | |
| CN108759157B (en) | One-time throttling two-stage compression heat pump system | |
| CN216592316U (en) | Heat pump set with large-pressure ratio and small-pressure ratio switching | |
| CN107747826B (en) | Air Conditioning System | |
| CN102778081A (en) | Multilevel heat pump system | |
| CN215638113U (en) | Refrigerating system | |
| CN216592315U (en) | Heat pump set with large-pressure ratio and small-pressure ratio switching | |
| CN215930176U (en) | Refrigerating system | |
| CN215930175U (en) | Refrigerating system | |
| CN215638112U (en) | Refrigerating system | |
| CN113154557B (en) | Quasi-two-stage compression four-pipe air conditioning system | |
| CN110285572B (en) | Air-supplying and enthalpy-increasing double-source heat pump water heater system | |
| CN211575589U (en) | Heat pump type air conditioning system | |
| CN108253653B (en) | Heat pump system with variable flow single-stage compression cycle and cascade cycle | |
| CN108759156B (en) | Secondary throttling middle incomplete cooling two-stage compression heat pump system | |
| CN116097041A8 (en) | Heat dissipation system, heat management device and working method thereof | |
| CN112963979A (en) | Overlapping heat pump system capable of realizing work cycle conversion | |
| CN113405280A (en) | Variable pressure ratio heat pump unit with intercooler and operation control method thereof | |
| CN215295184U (en) | Central air conditioning economizer system | |
| CN215892821U (en) | CO (carbon monoxide)2Refrigerant air conditioner | |
| CN113405281A (en) | Variable pressure ratio heat pump unit with flash vapor separator and operation control method thereof | |
| CN218672639U (en) | Heat pump air conditioner water heater suitable for cold area | |
| CN220524390U (en) | Magnetic levitation and screw combined type double-cold-source air source heat pump | |
| CN221036246U (en) | Gas-liquid hybrid power type heat pipe composite refrigerating system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |