CN110762874A - Self-overlapping air source heat pump system for defrosting by utilizing low-boiling-point working medium hot gas - Google Patents
Self-overlapping air source heat pump system for defrosting by utilizing low-boiling-point working medium hot gas Download PDFInfo
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- CN110762874A CN110762874A CN201911109682.9A CN201911109682A CN110762874A CN 110762874 A CN110762874 A CN 110762874A CN 201911109682 A CN201911109682 A CN 201911109682A CN 110762874 A CN110762874 A CN 110762874A
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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
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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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
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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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
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion 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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention discloses a self-overlapping air source heat pump system for defrosting by utilizing low-boiling point working medium hot gas, which comprises a compressor, a heat pump body and a heat pump body, wherein the compressor is used for compressing the working medium hot gas; the outlet of the compressor is connected with the inlet of the condenser through a pipeline provided with a heat accumulator; the outlet of the condenser is connected with the inlet of the gas-liquid separator; the liquid phase outlet of the gas-liquid separator is connected with the low-pressure side inlet of the evaporative condenser through a pipeline provided with a first throttling device; the gas-liquid separator gas-phase outlet is respectively connected with the heat accumulator and the high-pressure side inlet of the evaporative condenser; the high-pressure side outlet of the evaporative condenser is connected with the inlet of the second throttling device; the outlet of the second throttling device is connected with the inlet of the evaporator; the outlet of the evaporator is respectively connected with the outlet of the low-pressure side of the evaporative condenser and the inlet of the compressor. The invention is provided with the heat accumulator and the auxiliary throttling device on the basis of the traditional auto-cascade air source heat pump system, can provide enough defrosting heat and continuously heat in the defrosting process, and improves the stability and the energy utilization rate of the system during defrosting.
Description
Technical Field
The invention relates to the technical field of self-cascade air source heat pump defrosting, in particular to a self-cascade air source heat pump system for defrosting by utilizing low-boiling-point working medium hot gas.
Background
The key technical problem of the air source heat pump is the problem of frosting and defrosting, and the comfort and heating influence effects of the air source heat pump are obvious. At present, two thermal defrosting methods widely used by an air source heat pump are as follows: reverse cycle defrost and hot gas bypass defrost.
The energy of the double-overlapped air source heat pump for reverse cycle defrosting comes from the compressor to do work and the heat absorbed from the indoor side, and the defrosting time is short. There are some disadvantages, however: the reverse circulation defrosting has the problem of noise caused by the switching of the four-way reversing valve, and the four-way reversing valve is frequently reversed, so that the four-way valve can be damaged, and the reliability of the system is reduced; during the defrosting mode, oil injection phenomenon is easy to occur after the high-pressure part and the low-pressure part are switched, and when the heating mode is converted into the defrosting mode, the system pressure fluctuation is severe, and the generated mechanical impact force is large.
And the hot gas bypass defrosting solves part of defects of reverse cycle defrosting, and the problems of stable system parameter change, relatively good comfort, no airflow agitation and the like during defrosting are solved. However, the hot gas bypass defrosting energy only comes from the work of the compressor, and the defrosting time is relatively long; during defrosting, a large amount of liquid working media exist at the outlet of the air side heat exchanger, so that the gas-liquid separator has more accumulated liquid, the compressor can absorb air and carry liquid, and even liquid impact phenomenon is caused in severe cases, and the reliability of system operation is influenced.
In addition, in the two defrosting methods, the fans of the indoor heat exchanger need to be stopped in the defrosting process, and after the defrosting is finished, the fans can be started to restore heat supply after the surface temperature of the indoor heat exchanger reaches a certain value.
Therefore, further improvements are needed for the self-cascade air source heat pump defrosting method.
Disclosure of Invention
The invention aims to provide a self-overlapping air source heat pump system for defrosting by utilizing hot gas of a low-boiling point working medium, aiming at the technical defects in the prior art.
Therefore, the invention provides a self-overlapping air source heat pump system for defrosting by utilizing low-boiling point working medium hot gas, which comprises a compressor;
the refrigerant outlet of the compressor is connected with the refrigerant inlet of the condenser through a pipeline provided with the heat accumulator;
the refrigerant outlet of the condenser is connected with the refrigerant inlet of the gas-liquid separator;
a liquid phase outlet at the bottom of the gas-liquid separator is connected with a low-pressure side inlet of the evaporative condenser through a pipeline provided with a first throttling device;
a gas phase outlet at the top of the gas-liquid separator is respectively connected with the heat accumulator and a high-pressure side inlet of the evaporative condenser;
the outlet of the heat accumulator is connected with the inlet of a third throttling device, and the outlet of the third throttling device is connected with the refrigerant inlet of the evaporator;
the high-pressure side outlet of the evaporative condenser is connected with the inlet of the second throttling device;
the outlet of the second throttling device is connected with the refrigerant inlet of the evaporator;
and the refrigerant outlet of the evaporator is respectively connected with the low-pressure side outlet of the evaporative condenser and the refrigerant inlet of the compressor.
The first electromagnetic valve is positioned on a first branch of a refrigerant outlet of the compressor and a heat accumulator in a cross-connection mode;
the second electromagnetic valve is positioned on a second branch of a refrigerant outlet of the compressor and a condenser inlet in a cross-connection mode;
the third electromagnetic valve is positioned on a branch III of a gas-phase outlet of the gas-liquid separator and the heat accumulator in a cross-connection mode;
the fourth electromagnetic valve is positioned on a branch IV of a gas-phase outlet of the gas-liquid separator and a high-pressure side inlet of the evaporative condenser in a cross-connection mode;
the fifth electromagnetic valve is positioned on a branch fifth of the refrigerant outlet of the evaporator and the heat accumulator in a cross-connection mode;
and the sixth electromagnetic valve is positioned on a branch line six, the branch line six is connected with the heat accumulator and a branch line five of the pipeline of the fifth electromagnetic valve in parallel, and the sixth electromagnetic valve is connected with a refrigerant outlet of the evaporator.
The first throttling device, the second throttling device and the third throttling device are all electronic expansion valves or thermal expansion valves.
Compared with the prior art, the self-cascade air source heat pump system for defrosting by using the working medium hot gas with the low boiling point has scientific structural design, can provide enough defrosting heat by additionally arranging the heat accumulator and the auxiliary throttling device on the basis of the traditional self-cascade air source heat pump system, can continuously heat in the defrosting process, improves the working stability of the system during defrosting, improves the energy utilization rate, and has great production practice significance.
Drawings
FIG. 1 is a schematic structural diagram of a self-cascade air source heat pump system for defrosting by using low-boiling working medium hot gas according to the present invention;
in the figure: 1 is a compressor; 2 is a heat accumulator; 3 is a condenser; 4 is a gas-liquid separator; 5 is an evaporative condenser; 6 is an evaporator; 7 is a first throttling device; 8 is a second throttling device; 9 is a third throttling means; 10 is a first electromagnetic valve;
11 is a second electromagnetic valve; 12 is a third electromagnetic valve; 13 is a fourth electromagnetic valve; 14 is a fifth electromagnetic valve; 15 is a sixth electromagnetic valve;
branch 16 is branch one; branch 17 is a second branch; branch 18 is branch three; branch 19 is branch four; branch 20 is branch five; branch 21 is branch six.
Detailed Description
In order that those skilled in the art will better understand the technical solution of the present invention, the following detailed description of the present invention is provided in conjunction with the accompanying drawings and embodiments.
Referring to fig. 1, the invention provides a self-cascade air source heat pump system for defrosting by using low-boiling point working medium hot gas, which comprises a compressor 1;
a refrigerant outlet of the compressor 1 is connected with a refrigerant inlet of the condenser 3 through a pipeline provided with the heat accumulator 2;
a refrigerant outlet of the condenser 3 is connected with a refrigerant inlet of the gas-liquid separator 4;
a liquid phase outlet at the bottom of the gas-liquid separator 4 is connected with a low-pressure side inlet of the evaporative condenser 5 (namely the evaporative condenser) through a pipeline provided with a first throttling device 7;
a gas phase outlet at the top of the gas-liquid separator 4 is respectively connected with the heat accumulator 2 and a high-pressure side inlet of the evaporative condenser 5;
the outlet of the heat accumulator 2 (i.e. the outlet of the heat exchange pipeline correspondingly communicated with the gas phase outlet) is connected with the inlet of a third throttling device 9, and the outlet of the third throttling device 9 is connected with the refrigerant inlet of the evaporator 6;
the high-pressure side outlet of the evaporative condenser 5 is connected with the inlet of the second throttling device 8;
an outlet of the second throttling means 8 connected to a refrigerant inlet of the evaporator 6;
the refrigerant outlet of the evaporator 6 is connected to the low-pressure side outlet of the evaporative condenser 5 and the refrigerant inlet of the compressor 1, respectively.
For the present invention, it should be noted that the gas-liquid separator 4 has two outlets, which are respectively gas phase and liquid phase, wherein: a liquid phase outlet of the gas-liquid separator 4 is connected with an inlet of a first throttling device 7, and an outlet of the first throttling device 7 is connected with a low-pressure side inlet of the evaporative condenser 5; the gas phase outlet of the gas-liquid separator 4 is divided into two paths: one path of the heat accumulator 2 is connected with the heat accumulator 2, the heat accumulator 2 is connected with the inlet of a third throttling device 9, and the outlet of the third throttling device 9 is connected with the refrigerant inlet of the evaporator 6; the other path is connected with a high-pressure side inlet of the evaporative condenser 5, a high-pressure side outlet of the evaporative condenser 5 is connected with an inlet of a second throttling device 8, an outlet of the second throttling device 8 is connected with a refrigerant inlet of the evaporator 6, and an outlet of the evaporator 6 is respectively connected with a low-pressure side outlet of the evaporative condenser 5 and the refrigerant inlet of the compressor 1.
In the present invention, in a specific implementation, the present invention further includes a valve control system, specifically including: a first solenoid valve 10, a second solenoid valve 11, a third solenoid valve 12, a fourth solenoid valve 13, a fifth solenoid valve 14, and a sixth solenoid valve 15;
wherein, the first electromagnetic valve 10 is positioned on a branch 16 of a refrigerant outlet of the compressor 1 and the heat accumulator 2 in a bridging way;
the second electromagnetic valve 11 is positioned on a second branch 17 which is bridged between the refrigerant outlet of the compressor 1 and the inlet of the condenser 3;
the third electromagnetic valve 12 is positioned on a branch circuit III 18 of the gas-phase outlet of the gas-liquid separator 5 and the regenerator 2 in a bridging manner;
the fourth electromagnetic valve 13 is positioned on a branch circuit four 19 which is bridged between the gas phase outlet of the gas-liquid separator 4 and the high-pressure side inlet of the evaporative condenser 5;
a fifth solenoid valve 14 is located on a branch five 20 of the evaporator 6, which refrigerant outlet is bridged with the accumulator 2;
the sixth solenoid valve 15 is located on a branch six 21, the branch six 21 being connected in parallel to the accumulator 2 and to a branch five 20 of the fifth solenoid valve line 14, the sixth solenoid valve 15 being connected to the refrigerant outlet of the evaporator 6.
In the present invention, in a specific implementation, the first throttling device 7, the second throttling device 8 and the third throttling device 9 are all electronic expansion valves or thermal expansion valves.
In the invention, the refrigerant in the system is a non-azeotropic mixed refrigerant, and the non-azeotropic mixed refrigerant consists of a high boiling point refrigerant and a low boiling point refrigerant.
For a more clear understanding of the present invention, the following description is given of the operation cycle flow of the self-cascade air source heat pump system of the present invention:
first, superheated refrigerant vapor outputted from a refrigerant outlet of the compressor 1 enters the condenser 3 to be partially condensed, and a partially condensed high-pressure non-azeotropic gas-liquid two-phase mixture refrigerant fluid enters the gas-liquid separator 4 to be separated into a gas phase rich in a low-boiling component and a liquid phase rich in a high-boiling component. Wherein, the fluid rich in high boiling point enters the low-pressure side inlet of the evaporative condenser 5 to absorb heat after being throttled by the first throttling device 7; the refrigerant rich in the low-boiling point component enters the high-pressure side inlet of the evaporative condenser 5 through the fourth electromagnetic valve 13 to be condensed, then flows through the second throttling device 8 to be throttled and cooled, enters the evaporator 6, carries out heat convection with the air of the external environment through the evaporator 6 to absorb the heat of the air of the external environment, is mixed with the refrigerant rich in the high-boiling point component output from the low-pressure side outlet of the evaporative condenser 5 after being gasified, and enters the refrigerant inlet of the compressor 1 through the sixth electromagnetic valve 15 to complete the whole cycle of the self-cascade air source heat pump.
At this time, the fourth solenoid valve 13 and the sixth solenoid valve 15 are opened, and the third solenoid valve 12 and the fifth solenoid valve 14 are closed.
For a more clear understanding of the present invention, the following description is given of the flow of the defrosting cycle of the self-cascade air source heat pump system of the present invention:
firstly, superheated refrigerant vapor output from a refrigerant outlet of the compressor 1 enters the condenser 3 through the second electromagnetic valve 11 to be partially condensed, and a partially condensed high-pressure non-azeotropic gas-liquid two-phase mixture refrigerant fluid enters the gas-liquid separator 4 to be separated into a gas phase rich in low-boiling components and a liquid phase two-stream fluid rich in high-boiling components. The fluid rich in high boiling point enters the inlet of the low-pressure side of the evaporative condenser 5 to absorb heat after being throttled by the first throttling device 7; the gaseous refrigerant working medium rich in low boiling point components enters the heat accumulator 2 through the third electromagnetic valve 12 to absorb heat, the temperature is increased, then the gaseous refrigerant working medium is throttled and reduced by the third throttling device 9 and enters the evaporator 6 to be defrosted, the defrosted gaseous refrigerant is mixed with the refrigerant rich in high boiling point components output by the low-pressure side outlet of the evaporative condenser 5 and enters the heat accumulator 3 through the fifth electromagnetic valve 14 to absorb heat and evaporate, and finally the gaseous refrigerant is absorbed by the air inlet of the compressor 1 and is compressed, so that the whole defrosting cycle of the self-cascade air source heat pump is completed.
At this time, the third electromagnetic valve 12 and the fifth electromagnetic valve 14 are opened; the fourth solenoid valve 13 and the sixth solenoid valve 15 are closed.
It should be noted that, in a specific implementation, a pipeline through which the exhaust gas of the compressor 1 enters the condenser 3 is determined by a state of the heat accumulator, and the specific implementation is as follows: a temperature sensor is arranged in the heat accumulator 2, when the temperature of the heat storage material is lower than the temperature lower limit of 45 ℃, the second electromagnetic valve 11 is closed, the first electromagnetic valve 10 is opened, the exhaust gas of the compressor 1 is controlled to enter the heat accumulator 2, and therefore the heat storage material is heated and then enters the condenser 3; when the heat storage material reaches the upper temperature limit of 50 ℃, the first electromagnetic valve 10 is closed, the second electromagnetic valve 11 is opened, at the moment, the heat storage is finished, and the exhaust gas of the compressor 1 directly enters the condenser 3 through the second electromagnetic valve 11.
The invention adopts the heat accumulator to accumulate the exhaust heat of the compressor during the heating of the system, uses the low boiling point gas refrigerant at the gas phase outlet of the gas-liquid separator to defrost the evaporator, releases the accumulated heat by the heat accumulation material to provide enough defrosting heat, ensures that the gas entering the compressor is overheated gas, prevents the compressor from generating liquid impact, and improves the stability of the system. The defrosting operation is effectively carried out on the outdoor heat exchanger (namely an evaporator), the heating stability and the economical efficiency of the main loop are ensured, and the defrosting device has certain production practice significance.
Based on the technical scheme, the self-cascade air source heat pump system for defrosting by using the low-boiling point working medium hot gas aims at solving the problems that the self-cascade air source heat pump cannot continuously heat and defrost a heat source when defrosting. The system comprises a compressor, a heat accumulator, a condenser, an evaporative condenser, an evaporator, a throttling device, a gas-liquid separator and a valve control system. The system is provided with a heat accumulator behind the compressor, and the heat accumulator accumulates the exhaust heat of the compressor when the overlapping air source heat pump heats. During defrosting, the outdoor heat exchanger (namely an evaporator) is defrosted by using the low-boiling-point refrigerant at the gas-liquid separator gas-phase outlet, and at the moment, the heat accumulator releases heat accumulation, so that enough defrosting heat is provided, and defrosting time is shortened. After defrosting, the low boiling point working medium and the high boiling point working medium evaporated by the evaporative condenser are mixed and then enter the heat accumulator, and the heat absorption amount is changed into superheated gas which enters the compressor, so that the compressor is prevented from generating liquid impact. The system can defrost the outdoor heat exchanger while the indoor heat exchanger continuously heats, and ensures the heating stability of the system.
It should be noted that, for the present invention, any two components that are communicated with each other through a pipeline, as shown in fig. 1.
Compared with the prior art, the invention has the following technical effects:
1. utilize the working medium gas of low boiling point of vapour and liquid separator gas phase exit to carry out the steam defrosting to the evaporimeter, the condenser still lasts to heat during the defrosting, can not follow indoor side absorbed energy, does not influence user's travelling comfort.
2. The heat accumulator absorbs the exhaust heat of the compressor and is used for heating the low-boiling point gaseous working medium entering the evaporator for defrosting and the gas-liquid two-phase mixed working medium before the compressor after defrosting, so that the defrosting time is shortened, the problem that the liquid refrigerant generated by the air side heat exchanger cannot be evaporated during defrosting is solved, the liquid impact of the compressor is avoided, and the efficiency of the system is improved.
Compared with the prior art, the auto-cascade air source heat pump system for defrosting by using the low-boiling-point working medium hot gas has a scientific structural design, can provide enough defrosting heat by additionally arranging the heat accumulator and the auxiliary throttling device on the basis of the traditional auto-cascade air source heat pump system, can continuously heat in the defrosting process, improves the working stability of the system during defrosting, improves the energy utilization rate, and has great production practice significance.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (3)
1. A self-overlapping air source heat pump system for defrosting by using hot gas of a low-boiling-point working medium is characterized by comprising a compressor (1);
a refrigerant outlet of the compressor (1) is connected with a refrigerant inlet of the condenser (3) through a pipeline provided with the heat accumulator (2);
the refrigerant outlet of the condenser (3) is connected with the refrigerant inlet of the gas-liquid separator (4);
a liquid phase outlet at the bottom of the gas-liquid separator (4) is connected with a low-pressure side inlet of the evaporative condenser (5) through a pipeline provided with a first throttling device (7);
a gas-phase outlet at the top of the gas-liquid separator (4) is respectively connected with a high-pressure side inlet of the heat accumulator (2) and a high-pressure side inlet of the evaporative condenser (5);
the outlet of the heat accumulator (2) is connected with the inlet of a third throttling device (9), and the outlet of the third throttling device (9) is connected with the refrigerant inlet of the evaporator (6);
the high-pressure side outlet of the evaporative condenser (5) is connected with the inlet of the second throttling device (8);
the outlet of the second throttling device (8) is connected with the refrigerant inlet of the evaporator (6);
and a refrigerant outlet of the evaporator (6) is respectively connected with a low-pressure side outlet of the evaporative condenser (5) and a refrigerant inlet of the compressor (1).
2. The self-cascade air source heat pump system for defrosting by using hot gas of a low-boiling working medium as claimed in claim 1, characterized in that the first electromagnetic valve (10) is positioned on a first branch (16) of a refrigerant outlet of the compressor (1) and the heat accumulator (2) in a bridging way;
the second electromagnetic valve (11) is positioned on a second branch (17) of the refrigerant outlet of the compressor (1) and the inlet of the condenser (3) in a cross-connection mode;
the third electromagnetic valve (12) is positioned on a branch circuit III (18) of the gas-phase outlet of the gas-liquid separator (5) and the heat accumulator (2) in a cross-connection mode;
the fourth electromagnetic valve (13) is positioned on a branch circuit four (19) which is bridged between the gas phase outlet of the gas-liquid separator (4) and the high-pressure side inlet of the evaporative condenser (5);
a fifth electromagnetic valve (14) is positioned on a branch circuit five (20) of the refrigerant outlet of the evaporator (6) and the heat accumulator (2) in a cross-connection mode;
the sixth electromagnetic valve (15) is positioned on a branch line six (21), the branch line six (21) is connected with the heat accumulator (2) and a branch line five (20) of the fifth electromagnetic valve pipeline (14) in parallel, and the sixth electromagnetic valve (15) is connected with a refrigerant outlet of the evaporator (6).
3. The self-cascade air source heat pump system for defrosting by using a low-boiling working medium hot gas as claimed in claim 1, wherein the first throttling device (7), the second throttling device (8) and the third throttling device (9) are all electronic expansion valves or thermal expansion valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911109682.9A CN110762874A (en) | 2019-11-14 | 2019-11-14 | Self-overlapping air source heat pump system for defrosting by utilizing low-boiling-point working medium hot gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911109682.9A CN110762874A (en) | 2019-11-14 | 2019-11-14 | Self-overlapping air source heat pump system for defrosting by utilizing low-boiling-point working medium hot gas |
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| Publication Number | Publication Date |
|---|---|
| CN110762874A true CN110762874A (en) | 2020-02-07 |
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| CN201911109682.9A Pending CN110762874A (en) | 2019-11-14 | 2019-11-14 | Self-overlapping air source heat pump system for defrosting by utilizing low-boiling-point working medium hot gas |
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| CN (1) | CN110762874A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113654282A (en) * | 2021-09-01 | 2021-11-16 | 深圳市派沃新能源科技股份有限公司 | Air source heat pump defrosting system and defrosting judgment method |
-
2019
- 2019-11-14 CN CN201911109682.9A patent/CN110762874A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113654282A (en) * | 2021-09-01 | 2021-11-16 | 深圳市派沃新能源科技股份有限公司 | Air source heat pump defrosting system and defrosting judgment method |
| CN113654282B (en) * | 2021-09-01 | 2024-03-19 | 深圳市派沃新能源科技股份有限公司 | Defrosting system of air source heat pump and defrosting judgment method |
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