CN110762889A - Air source heat pump system for preventing frost accumulation - Google Patents
Air source heat pump system for preventing frost accumulation Download PDFInfo
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- CN110762889A CN110762889A CN201911011595.XA CN201911011595A CN110762889A CN 110762889 A CN110762889 A CN 110762889A CN 201911011595 A CN201911011595 A CN 201911011595A CN 110762889 A CN110762889 A CN 110762889A
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- pipeline
- economizer
- heat exchanger
- compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B40/00—Subcoolers, desuperheaters or superheaters
- F25B40/02—Subcoolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2509—Economiser valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention discloses an anti-frost-accumulation air source heat pump system which comprises a fin heat exchanger, a four-way valve, a compressor, a gas-liquid separator, a shell and tube heat exchanger and an economizer, wherein the four-way valve is provided with an E tube, an S tube, a C tube and a D tube, and the compressor is provided with an exhaust port, an air suction port and an enthalpy-increasing port. According to the invention, the one-way valve and the electromagnetic valve are additionally arranged in front of the economizer, the natural subcooler is additionally arranged at the front end of the outdoor fin heat exchanger, the supercooling degree of the refrigerant is increased through the forced heat exchange of the outdoor fan, and then the refrigerant flows back to the inlet of the economizer, and the supercooled refrigerant passing through the natural subcooler ensures that the enthalpy-increasing pipeline of the compressor has enough refrigerant inflow, so that the optimal capacity of the compressor can be exerted; meanwhile, after the low-temperature air at the outdoor side passes through the natural subcooler, the temperature is raised, so that the inlet air temperature of the fin heat exchanger at the bottom of the outdoor side fin is higher than that of other places, and the phenomenon of ice mountain at the bottom of the fin is avoided.
Description
Technical Field
The invention relates to the technical field of air source heat pumps, in particular to an anti-frost-accumulation air source heat pump system.
Background
An air source heat pump is an energy-saving device which utilizes high-level energy to enable heat to flow from low-level heat source air to a high-level heat source. It is a form of heat pump. As the name implies, a heat pump, like a pump, can convert low-level heat energy (such as heat contained in air, soil and water) which cannot be directly utilized into high-level heat energy which can be utilized, thereby achieving the purpose of saving part of high-level energy (such as coal, gas, oil, electric energy and the like).
When a unit of the air source heat pump system operates under a low-temperature working condition, due to the fact that the pressure ratio of a compressor is high, exhaust temperature is high, in order to guarantee that the oil temperature of the unit is not carbonized too high, a certain liquid carrying phenomenon is prone to occurring during unit control, the exhaust temperature is reduced by slight liquid carrying, but liquid carrying can enable a refrigerant on a condensation side of the unit to migrate into a vapor-liquid separator of the unit for a long time, under the condition that water flows out at a high temperature, the supercooling degree of the unit is low or even does not have the supercooling degree, an economizer cannot take the refrigerant, and the enthalpy increasing of the compressor is ineffective.
Disclosure of Invention
In order to overcome the technical problems, the invention aims to provide an anti-frost-accumulation air source heat pump system, a one-way valve and an electromagnetic valve are additionally arranged in front of an economizer, a natural subcooler is additionally arranged at the front end of an outdoor side fin heat exchanger, the supercooling degree of a refrigerant is increased by the forced heat exchange of an outdoor fan and then the refrigerant flows back to an inlet of the economizer, and the supercooled refrigerant passing through the natural subcooler ensures that an enthalpy-increasing pipeline of a compressor has enough refrigerant flowing in, so that the optimal capacity of the compressor can be exerted; meanwhile, after the low-temperature air at the outdoor side passes through the natural subcooler, the temperature is raised, so that the inlet air temperature of the fin heat exchanger at the bottom of the outdoor side fin is higher than that of other places, and the phenomenon of ice mountain at the bottom of the fin is avoided.
The purpose of the invention can be realized by the following technical scheme:
an anti-frost air source heat pump system comprises a fin heat exchanger, a four-way valve, a compressor, a gas-liquid separator, a shell and tube heat exchanger and an economizer, wherein the four-way valve is provided with an E tube, an S tube, a C tube and a D tube, the compressor is provided with an exhaust port, an air suction port and an enthalpy increasing port, and the economizer is provided with an auxiliary road inlet, a main road outlet and a main road inlet;
the exhaust port of the compressor is communicated with a D pipe of the four-way valve through a pipeline, the air suction port of the compressor is communicated with the output end of the gas-liquid separator through a pipeline, the input end of the gas-liquid separator is communicated with the S pipe of the four-way pipe through a pipeline, the E pipe of the four-way pipe is communicated with the input end of the shell and tube heat exchanger through a pipeline, the output end of the shell and tube heat exchanger is communicated with the main path inlet of the economizer through a pipeline series liquid storage device, an auxiliary inlet of the economizer is communicated with an enthalpy increasing port of the compressor through a pipeline, a main outlet of the economizer is communicated with the input end of the finned heat exchanger through a pipeline series connection main electronic expansion valve, the auxiliary path inlet of the economizer is communicated with a pipeline between the main electronic expansion valve and the main path outlet of the economizer through a pipeline series-connection auxiliary electronic expansion valve, and the output end of the finned heat exchanger is communicated with a pipe C of the four-way valve through a pipeline;
the fin heat exchanger is characterized in that a natural subcooler is fixed inside the fin heat exchanger, the output end of the natural subcooler is communicated with a pipeline close to the main inlet of the economizer through a pipeline series connection second one-way valve, the input end of the natural subcooler is communicated with a pipeline far away from the main inlet of the economizer through a pipeline, and a first one-way valve is connected in series at the position, between the connection position of the input pipeline and the output pipeline of the natural subcooler, of a pipeline connected with a second connecting pipe of the economizer.
Further, the method comprises the following steps: the first one-way valve limits fluid to flow from the main path inlet of the economizer to the direction of the liquid storage device, the second one-way valve limits fluid to flow into the output end of the natural subcooler, and the movement direction of the refrigerant is limited by the first one-way valve and the second one-way valve, so that the refrigerant can fully flow in the natural subcooler.
Further, the method comprises the following steps: the fin heat exchanger and the radiator are matched with a fan, and the fan is arranged to perform forced heat exchange on the fin heat exchanger, so that the supercooling degree of the refrigerant is increased.
Further, the method comprises the following steps: the compressor is frequency conversion compressor, can reduce the energy consumption through setting up frequency conversion compressor, avoids frequently opening simultaneously and stops to cause the damage to frequency conversion compressor, prolongs the life of compressor.
Further, the method comprises the following steps: the input end and the output end of the first one-way valve are connected with an electromagnetic valve in parallel, and the electromagnetic valve can control the natural subcooler.
The invention has the beneficial effects that:
1. the one-way valve and the electromagnetic valve are added in front of the economizer, and the natural subcooler is added at the front end of the outdoor side fin heat exchanger, so that when the air source heat pump system is in heating operation, the bypass electromagnetic valve is opened, the unit is normally heated without adding extra subcooling, when the unit needs extra subcooling, the bypass electromagnetic valve is closed, the refrigerant is forced to pass through the outdoor side natural subcooler, the supercooling degree of the refrigerant is increased through the forced heat exchange of an outdoor fan, and then the refrigerant flows back to the inlet of the economizer, and the supercooling refrigerant passing through the natural subcooler ensures that the enthalpy-increasing pipeline of the compressor has enough refrigerant inflow, so that the optimal capacity of the compressor can be exerted; meanwhile, after the low-temperature air at the outdoor side passes through the natural subcooler, the temperature is raised, so that the inlet air temperature of the fin heat exchanger at the bottom of the outdoor side fin is higher than that of other places, and the phenomenon of ice mountain at the bottom of the fin is avoided.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a system block diagram of an anti-frost air-source heat pump system of the present invention;
FIG. 2 is a schematic diagram of the four-way valve of the present invention.
In the figure: 1. a natural subcooler; 2. a finned heat exchanger; 3. a fan; 4. a four-way valve; 41. e, a pipe; 42. an S pipe; 43. c, a pipe; 44. d, pipe; 5. a compressor; 6. a gas-liquid separator; 7. a shell and tube heat exchanger; 8. a reservoir; 9. a first check valve; 10. a second one-way valve; 11. an economizer; 12. an auxiliary electronic expansion valve; 13. a main electronic expansion valve; 14. an electromagnetic valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, an anti-frost air source heat pump system includes a finned heat exchanger 2, a four-way valve 4, a compressor 5, a gas-liquid separator 6, a shell-and-tube heat exchanger 7 and an economizer 11, wherein the four-way valve 4 is provided with an E-tube 41, an S-tube 42, a C-tube 43 and a D-tube 44, the compressor 5 is provided with an exhaust port, an air suction port and an enthalpy increasing port, and the economizer 11 is provided with a side road inlet, a main road outlet and a main road inlet;
an exhaust port of the compressor 5 is communicated with a D pipe 44 of the four-way valve 4 through a pipeline, an air suction port of the compressor 5 is communicated with an output end of the gas-liquid separator 6 through a pipeline, an input end of the gas-liquid separator 6 is communicated with an S pipe 42 of the four-way valve 4 through a pipeline, an E pipe 41 of the four-way valve 4 is communicated with an input end of the shell-and-tube heat exchanger 7 through a pipeline, an output end of the shell-and-tube heat exchanger 7 is communicated with a main circuit inlet of the economizer 11 through a pipeline series liquid storage device 8, an auxiliary circuit inlet of the economizer 11 is communicated with an enthalpy-increasing port of the compressor 5 through a pipeline, a main circuit outlet of the economizer 11 is communicated with an input end of the fin heat exchanger 2 through a pipeline series main electronic expansion valve 13, an auxiliary circuit inlet of the economizer 11 is communicated with a pipeline between the main electronic expansion valve 13 and the main circuit outlet of the economizer;
a natural subcooler 1 is fixed inside the fin heat exchanger 2, the output end of the natural subcooler 1 is communicated with a pipeline close to the inlet of a main path of the economizer 11 through a pipeline series second one-way valve 10, the input end of the natural subcooler 1 is communicated with a pipeline far away from the inlet of the main path of the economizer 11 through a pipeline, and a first one-way valve 9 is connected in series at the joint of the input pipeline and the output pipeline of the natural subcooler 1 and connected with a pipeline connected with a second connecting pipe of the economizer 11.
First check valve 9 restriction fluid flows from the import of 11 main roads of economic ware to 8 directions of reservoir, second check valve 10 restriction fluid flows into 1 output of nature subcooler, restrict the refrigerant moving direction through setting up first check valve 9 and second check valve 10, make the refrigerant can fully flow in 1 inside of nature subcooler, the supporting fan 3 that is provided with of fin heat exchanger 2, force the heat transfer to fin heat exchanger through setting up fan 3, make the refrigerant increase the subcooling degree, compressor 5 is frequency conversion compressor, can reduce the energy consumption through setting up frequency conversion compressor, avoid frequently opening simultaneously and stop and lead to the fact the damage to frequency conversion compressor, the life of extension compressor 5.
The input end and the output end of the first one-way valve 9 are connected with an electromagnetic valve 14 in parallel, and the natural subcooler 1 can be controlled by arranging the electromagnetic valve.
Control of the solenoid valve 14: when the unit heats, the electromagnetic valve is controlled according to the ambient temperature, when the ambient temperature is more than or equal to 10 ℃, the electromagnetic valve is closed, and when the ambient temperature is less than 10 ℃, the electromagnetic valve is opened; when the unit refrigerates, the electromagnetic valve is closed and opened, when the ambient temperature is higher, the effect of the natural subcooler 1 is not high, the unit does not frost, and the unit has enough supercooling degree, and the electromagnetic valve 14 is opened at the moment to allow the refrigerant to flow through the economizer 11 in a direct current manner.
The working principle is as follows: when the unit is in heating operation, the compressor 5 compresses low-temperature and low-pressure gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant, the high-temperature and high-pressure gaseous refrigerant passes through the four-way valve 4, reaches the shell-and-tube heat exchanger 7, is condensed into high-pressure medium-temperature liquid refrigerant, flows to the natural subcooler 1 through the liquid reservoir 8, is further subcooled and then flows back to the economizer 11, the two paths are divided from the main path outlet of the economizer, one path intercepts a part of the refrigerant, and is gasified into low-temperature and medium-pressure gas after throttling and pressure reduction through the auxiliary expansion valve 12, cooling the refrigerant at the main path inlet of the economizer, and;
the other path passes through a main path expansion valve 13, is throttled and depressurized, then flows through a fin heat exchanger 2, under the action of a fan 3, low-temperature and low-pressure two-phase refrigerant is gasified to absorb heat in air, and is changed into low-temperature and low-pressure gaseous refrigerant, then flows through a four-way valve 4, enters a gas-liquid separator 6, and returns to a compressor suction port, so that under the condition of low ambient temperature, when the inlet and outlet water temperature of a shell and tube heat exchanger 7 is high, the exhaust temperature of a unit is increased, in order to protect compressor oil from carbonization, the main path expansion valve 13 needs to be opened, the unit slightly carries liquid to reduce the exhaust temperature, at the moment, the gas-liquid separator 6 inevitably stores a part of liquid refrigerant, the liquid supercooling degree of the outlet of the shell and tube heat exchanger 7 is low, even no supercooling degree exists, namely, at the moment, the refrigerant at the outlet of the shell and tube heat exchanger is in, when a part of refrigerant is intercepted to the auxiliary expansion valve 12, because a part of the refrigerant is gaseous at the moment, the amount of liquid refrigerant passing through the auxiliary expansion valve is reduced, the refrigerant passing through an enthalpy increasing port of the compressor is reduced, the heating capacity of the unit cannot play the maximum effect, the one-way valve 9 is additionally arranged at the main path inlet of the economizer 11 through the system, so that two-phase refrigerant at the outlet of the shell-and-tube heat exchanger 7 flows through a natural subcooler, the two-phase refrigerant is changed into subcooled liquid refrigerant and then flows into the inlet of the economizer 11, the liquid refrigerant is intercepted after passing through the economizer 11, throttled and depressurized and enters the enthalpy increasing port of the compressor 5, the capacity of the compressor 5 can be fully played, meanwhile, when the medium-temperature and high-pressure two-phase refrigerant at the outlet of the shell-and-tube heat exchanger 7 flows through the natural heat exchanger, the low-temperature, so that the bottom of the fin heat exchanger 2 is prevented from generating the phenomenon of 'iceberg'.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.
Claims (5)
1. The air source heat pump system capable of preventing frost accumulation is characterized by comprising a fin heat exchanger (2), a four-way valve (4), a compressor (5), a gas-liquid separator (6), a shell and tube heat exchanger (7) and an economizer (11), wherein the four-way valve (4) is provided with an E pipe (41), an S pipe (42), a C pipe (43) and a D pipe (44), the compressor (5) is provided with an exhaust port, an air suction port and an enthalpy increasing port, and the economizer (11) is provided with a secondary road inlet, a primary road outlet and a primary road inlet;
the exhaust port of the compressor (5) is communicated with a D pipe (44) of the four-way valve (4) through a pipeline, the suction port of the compressor (5) is communicated with the output end of the gas-liquid separator (6) through a pipeline, the input end of the gas-liquid separator (6) is communicated with an S pipe (42) of the four-way pipe (4) through a pipeline, an E pipe (41) of the four-way pipe (4) is communicated with the input end of a shell and tube heat exchanger (7) through a pipeline, the output end of the shell and tube heat exchanger (7) is communicated with a main circuit inlet of the economizer (11) through a pipeline series connection liquid storage device (8), an auxiliary circuit inlet of the economizer (11) is communicated with an enthalpy increasing port of the compressor (5) through a pipeline, a main circuit outlet of the economizer (11) is communicated with the input end of the fin heat exchanger (2) through a pipeline series connection main electronic expansion valve (13), and an auxiliary circuit inlet of the economizer (11) is communicated with the main electronic expansion valve (13 The main path outlets of the devices (11) are communicated with each other through a pipeline, and the output end of the finned heat exchanger (2) is communicated with a C pipe (43) of the four-way valve (4) through a pipeline;
the fin heat exchanger (2) is internally fixed with a natural subcooler (1), the output end of the natural subcooler (1) is communicated with a pipeline close to a main path inlet of the economizer (11) through a pipeline series connection second one-way valve (10), the input end of the natural subcooler (1) is communicated with a pipeline far away from the main path inlet of the economizer (11) through a pipeline, and a first one-way valve (9) is connected in series at the connection position of the pipeline connecting a second connecting pipe of the economizer (11) between the input and output pipelines of the natural subcooler (1).
2. The frost-accumulation prevention air-source heat pump system as claimed in claim 1, wherein the first check valve (9) restricts the flow of the fluid from the economizer (11) main path inlet to the reservoir (8), and the second check valve (10) restricts the flow of the fluid to the natural subcooler (1) output.
3. The frost-accumulation preventing air source heat pump system as claimed in claim 1, wherein the fin heat exchanger (2) is provided with a fan (3) in a matching way.
4. Frost-accumulation prevention air-source heat pump system according to claim 1, characterised in that the compressor (5) is an inverter compressor.
5. The frost-accumulation preventing air source heat pump system as claimed in claim 1, characterized in that the input and output ends of the first check valve (9) are connected with a solenoid valve (14) in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911011595.XA CN110762889A (en) | 2019-10-23 | 2019-10-23 | Air source heat pump system for preventing frost accumulation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911011595.XA CN110762889A (en) | 2019-10-23 | 2019-10-23 | Air source heat pump system for preventing frost accumulation |
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| CN110762889A true CN110762889A (en) | 2020-02-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113405274A (en) * | 2021-05-28 | 2021-09-17 | 维克（天津）有限公司 | Ultra-low temperature air-cooled module machine system |
| CN114812001A (en) * | 2022-06-02 | 2022-07-29 | 广州市华德工业有限公司 | Indirect evaporation air source heat pump device and control method |
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| CN205026983U (en) * | 2015-09-24 | 2016-02-10 | 无锡同方人工环境有限公司 | Take low ambient temperature air source heat pump system of cold loop |
| CN207268552U (en) * | 2017-09-05 | 2018-04-24 | 宁波港菱环境科技股份有限公司 | A kind of mechanism for preventing heat pump apparatus of air source exchanger base from freezing |
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| CN1337552A (en) * | 2000-08-03 | 2002-02-27 | 北京海尔集成电路设计有限公司 | Ice preventer for wind cooled heat pump air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113405274A (en) * | 2021-05-28 | 2021-09-17 | 维克（天津）有限公司 | Ultra-low temperature air-cooled module machine system |
| CN114812001A (en) * | 2022-06-02 | 2022-07-29 | 广州市华德工业有限公司 | Indirect evaporation air source heat pump device and control method |
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Application publication date: 20200207 |