CN112413949A - Hot gas bypass defrosting system and method for air source heat pump - Google Patents
Hot gas bypass defrosting system and method for air source heat pump Download PDFInfo
- Publication number
- CN112413949A CN112413949A CN202011314677.4A CN202011314677A CN112413949A CN 112413949 A CN112413949 A CN 112413949A CN 202011314677 A CN202011314677 A CN 202011314677A CN 112413949 A CN112413949 A CN 112413949A
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- Prior art keywords
- heat exchanger
- way valve
- hot gas
- compressor
- pipeline
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Classifications
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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
- F25B47/022—Defrosting cycles hot gas defrosting
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
Abstract
The invention discloses a hot gas bypass defrosting system and a hot gas bypass defrosting method for an air source heat pump, wherein the system comprises a compressor, a plate heat exchanger, a fin heat exchanger, a four-way valve and a throttling device, wherein the compressor is respectively connected with the four-way valve through a first pipeline and a second pipeline; the four-way valve is connected with the fin heat exchanger through a pipeline, the other end of the fin heat exchanger is connected with the plate heat exchanger through a pipeline, and a throttling device is arranged on the pipeline between the fin heat exchanger and the plate heat exchanger; the fin heat exchanger is connected with a first pipeline through a No. 1 electromagnetic two-way valve and a No. 2 electromagnetic two-way valve respectively; in the defrosting mode, the compressor starts to reduce the frequency, and hot gas of the exhaust pipe of the compressor of the electromagnetic two-way valve is directly led to the fin heat exchanger for defrosting. According to the invention, by adopting a hot gas bypass technical scheme, the hot gas discharge capacity is controlled through the variable frequency compressor and the electromagnetic valve, so that the most reasonable economy and the optimized defrosting effect are achieved when the unit defrosts, and the requirements of energy conservation and emission reduction are met.
Description
Technical Field
The invention relates to the technical field of air source heat pumps, in particular to northern low-temperature heating and hot water application, and particularly relates to a hot gas bypass defrosting system and method of an air source heat pump.
Background
On the air source heat pump heating market at present, many heating heat pump systems adopt cross valve switching-over defrosting control, the leaving water temperature descends rapidly when leading to the defrosting, a large amount of liquid refrigerant gets into the compressor after the defrosting for the compressor oil extraction is big, influences compressor and unit life-span, and room temperature fluctuation is big, and user experience feels poor, and simultaneously, leaving water temperature descends rapidly when defrosting, and a large amount of liquid refrigerant gets into the compressor after the defrosting, causes the compressor liquid attack phenomenon to take place occasionally.
To solve this problem, the present invention is hereby proposed.
Disclosure of Invention
The invention aims to provide a hot gas bypass defrosting system of an air source heat pump, which accurately controls hot gas through a variable frequency compressor and an electromagnetic valve, achieves the aim of defrosting on the basis of no shutdown during heating and solves the defects of the background technology.
The purpose of the invention can be realized by the following technical scheme:
a hot gas bypass defrosting system of an air source heat pump comprises a compressor, a plate heat exchanger, a fin heat exchanger, a four-way valve and a throttling device, wherein the compressor is connected with the four-way valve through a first pipeline and a second pipeline respectively; the four-way valve is connected with the fin heat exchanger through a pipeline, the other end of the fin heat exchanger is connected with the plate heat exchanger through a pipeline, the other end of the plate heat exchanger is connected with the four-way valve, and a throttling device is arranged on the pipeline between the fin heat exchanger and the plate heat exchanger; the fin heat exchanger is connected with the first pipeline through a No. 1 electromagnetic two-way valve and a No. 2 electromagnetic two-way valve respectively.
Furthermore, the first pipeline is provided with a high-voltage switch and an exhaust temperature sensor.
Furthermore, a pressure sensor, a low-pressure switch and a return air temperature sensor are arranged on the second pipeline.
Furthermore, a balance tank is arranged on a pipeline between the fin heat exchanger and the plate heat exchanger.
Furthermore, a refrigeration coil temperature sensor is arranged between the throttling device and the balance tank.
Preferably, the compressor is a direct current variable frequency compressor.
Preferably, the plate heat exchanger is provided with an inlet water temperature sensor and an outlet water temperature sensor.
Furthermore, a coil pipe temperature sensor and an environment temperature sensor are arranged on the finned heat exchanger.
Further, when the system enters a defrosting control mode, the compressor starts to reduce the frequency, the No. 1 electromagnetic two-way valve and/or the No. 2 electromagnetic two-way valve are opened, and hot gas of the exhaust pipe of the compressor directly leads to the fin heat exchanger for defrosting.
The invention also aims to provide a hot gas bypass defrosting method of the air source heat pump.
The purpose of the invention can be realized by the following technical scheme:
a hot gas bypass defrosting method of an air source heat pump comprises the following steps:
s1, the compressor operates in a frequency reduction mode, the No. 1 electromagnetic two-way valve is opened, and S2 is turned;
s2, directly leading hot gas of a compressor exhaust pipe to the fin heat exchanger for defrosting, and turning to S3;
s3, measuring the temperature of the coil of the fin heat exchanger in real time by using a coil temperature sensor, and turning to S4;
s4, judging whether defrosting is finished within a period of time, if so, turning to S5, if not, turning to S6;
s5, the compressor recovers normal frequency operation, and the No. 1 electromagnetic two-way valve is closed;
and (4) opening an S6:2 electromagnetic two-way valve, and enabling more hot air to enter the fin heat exchanger for defrosting.
The invention has the beneficial effects that:
1. when the air source heat pump system is defrosted, the technical scheme of hot gas bypass is adopted, and the variable frequency compressor and the electromagnetic valve are used for controlling the hot gas discharge capacity, so that the unit is most reasonable in economy and optimal in defrosting effect during defrosting, and the requirements of energy conservation and emission reduction are met.
2. The invention does not need to switch the four-way valve when defrosting is realized, the temperature of hot water can not be reduced, the use of a user is not influenced, and the technical scheme of the invention can not cause severe fluctuation of high pressure and low pressure of a system, thereby causing abnormal vibration and sound; and the compressor can not generate liquid refrigerant liquid impact phenomenon, and the service life of the compressor and the unit is reduced.
Drawings
The invention will be further described with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a hot gas bypass defrosting system of an air source heat pump.
Fig. 2 is a flow chart of the hot gas bypass defrosting method of the air source heat pump.
Reference numerals:
1-a compressor; 10-a balancing tank; 11-a high voltage switch; 12-exhaust gas temperature sensor; 13-a first conduit; 14-a second conduit; no. 15-1 electromagnetic two-way valve; no. 16-2 electromagnetic two-way valve; 2-a plate heat exchanger; 21-inlet water temperature sensor; 22-outlet water temperature sensor; 3-a finned heat exchanger; 31-coil temperature sensor; 32-ambient temperature sensor; 4-a four-way valve; 5-a throttling device; 6-return air temperature sensor; 7-a low-voltage switch; 8-a pressure sensor; 9-refrigeration coil temperature sensor.
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, the hot gas bypass defrosting system of the air source heat pump comprises a compressor 1, a plate heat exchanger 2, a fin heat exchanger 3, a four-way valve 4 and a throttling device 5, wherein the compressor 1 is respectively connected with the four-way valve 4 through a first pipeline 13 and a second pipeline 14, and the first pipeline 13 is provided with a high-pressure switch 11 and an exhaust temperature sensor 12; and a pressure sensor 8, a low-pressure switch 7 and a return air temperature sensor 6 are arranged on the second pipeline 14.
The four-way valve 4 is connected with the fin heat exchanger 3 through a pipeline, the other end of the fin heat exchanger 3 is connected with the plate heat exchanger 2 through a pipeline, the other end of the plate heat exchanger 2 is connected with the four-way valve 4, a throttling device 5 and a balance tank 10 are arranged on the pipeline between the fin heat exchanger 3 and the plate heat exchanger 2, the throttling device 5 is located on one side close to the fin heat exchanger 3, and the balance tank 10 is located on one side close to the plate heat exchanger 2.
The balancing tank 10 is used for containing a refrigerant circulating in the system.
And a refrigerating coil temperature sensor 9 is arranged between the throttling device 5 and the balance tank 10.
The finned heat exchanger 3 is connected with the first pipeline 13 through a No. 1 electromagnetic two-way valve 15 and a No. 2 electromagnetic two-way valve 16 respectively.
Preferably, the compressor 1 is a direct-current inverter compressor.
Be equipped with into water temperature sensor 21 and play water temperature sensor 22 on plate heat exchanger 2, the temperature sensor 21 of intaking is arranged in measuring the temperature of intaking in plate heat exchanger 2, play water temperature sensor 22 is arranged in measuring the play water temperature in plate heat exchanger 2.
Be equipped with coil pipe temperature sensor 31 and ambient temperature sensor 32 on the fin heat exchanger 3, coil pipe temperature sensor 31 is used for measuring 3 coil pipe temperatures of fin heat exchanger, and ambient temperature sensor 32 is used for measuring ambient temperature.
When the system is in heating operation, the outdoor fin heat exchanger 3 operates, the four-way valve 4 is reversed, the compressor 1 is started, and high-temperature and high-pressure gas discharged from the compressor 1 enters the indoor plate heat exchanger 2 through the four-way valve 4 for heat exchange; the refrigerant temperature through the indoor plate heat exchanger 2 reduces, becomes liquid by high temperature, high pressure gas, is throttled by throttling arrangement 5, becomes low temperature low pressure liquid and gets back to outdoor fin heat exchanger 3, in outdoor fin heat exchanger 3, through absorbing the heat, evaporates into gas, through cross valve 4, gets back to compressor 1, accomplishes a circulation.
When the system enters a defrosting control mode, the compressor 1 starts to reduce the frequency, the electromagnetic two-way valve 15 No. 1 is opened, hot gas of an exhaust pipe of the compressor 1 directly flows to the finned heat exchanger 3 to defrost, the temperature of a coil of the finned heat exchanger is measured in real time through the coil temperature sensor 31, the frequency of the compressor 1 is adjusted and corrected, and if the requirement cannot be met within a set time, the electromagnetic two-way valve 16 No. 2 is opened, so that more hot gas enters the finned heat exchanger 3 to defrost.
Through arranging the passages from the compressor 1, the No. 1 electromagnetic two-way valve 15 and the No. 2 electromagnetic two-way valve 16 to the finned heat exchanger 3, hot gas of an exhaust pipe of the compressor 1 can directly lead to the finned heat exchanger 3 for defrosting.
The hot gas bypass defrosting method of the air source heat pump comprises the following specific steps:
s1, the compressor operates in a frequency reduction mode, the No. 1 electromagnetic two-way valve is opened, and S2 is turned;
s2, directly leading hot gas of a compressor exhaust pipe to the fin heat exchanger for defrosting, and turning to S3;
s3, measuring the temperature of the coil of the fin heat exchanger in real time by using a coil temperature sensor, and turning to S4;
s4, judging whether defrosting is finished within a period of time, if so, turning to S5, if not, turning to S6;
s5, the compressor recovers normal frequency operation, and the No. 1 electromagnetic two-way valve is closed;
and (4) opening an S6:2 electromagnetic two-way valve, and enabling more hot air to enter the fin heat exchanger 3 for defrosting.
The invention does not need to switch the four-way valve when defrosting is realized, the temperature of hot water can not be reduced, the use of a user is not influenced, and the technical scheme of the invention can not cause severe fluctuation of high pressure and low pressure of a system, thereby causing abnormal vibration and sound; and the compressor can not generate liquid refrigerant liquid impact phenomenon, and the service life of the compressor and the unit is reduced.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A hot gas bypass defrosting system of an air source heat pump comprises a compressor (1), a plate heat exchanger (2), a fin heat exchanger (3), a four-way valve (4) and a throttling device (5), and is characterized in that the compressor (1) is connected with the four-way valve (4) through a first pipeline (13) and a second pipeline (14) respectively; the four-way valve (4) is connected with the fin heat exchanger (3) through a pipeline, the other end of the fin heat exchanger (3) is connected with the plate heat exchanger (2) through a pipeline, the other end of the plate heat exchanger (2) is connected with the four-way valve (4), and a throttling device (5) is arranged on the pipeline between the fin heat exchanger (3) and the plate heat exchanger (2); the fin heat exchanger (3) is connected with the first pipeline (13) through a No. 1 electromagnetic two-way valve (15) and a No. 2 electromagnetic two-way valve (16) respectively.
2. The air source heat pump hot gas bypass defrosting system according to claim 1, characterized in that the first pipeline (13) is provided with a high-voltage switch (11) and a discharge temperature sensor (12).
3. The hot gas bypass defrosting system of an air source heat pump according to claim 1, characterized in that the second pipeline (14) is provided with a pressure sensor (8), a low-pressure switch (7) and a return air temperature sensor (6).
4. The hot gas bypass defrosting system of an air source heat pump according to claim 1, characterized in that a balance tank (10) is arranged on the pipeline between the fin heat exchanger (3) and the plate heat exchanger (2).
5. The air source heat pump hot gas bypass defrosting system according to claim 1, characterized in that a refrigeration coil temperature sensor (9) is arranged between the throttling device (5) and the balance tank (10).
6. The air source heat pump hot gas bypass defrosting system according to claim 1, characterized in that the compressor (1) is a dc frequency conversion compressor.
7. The hot gas bypass defrosting system of an air source heat pump according to claim 1, characterized in that the plate heat exchanger (2) is provided with an inlet water temperature sensor (21) and an outlet water temperature sensor (22).
8. The hot gas bypass defrosting system of an air source heat pump according to claim 1, characterized in that the finned heat exchanger (3) is provided with a coil temperature sensor (31) and an ambient temperature sensor (32).
9. The hot gas bypass defrosting system of the air source heat pump according to the claim 1, characterized in that when the system enters the defrosting mode, the compressor (1) starts to reduce the frequency, the number 1 electromagnetic two-way valve (15) and/or the number 2 electromagnetic two-way valve (16) are opened, and the hot gas of the exhaust pipe of the compressor (1) is directly led to the finned heat exchanger (3) for defrosting.
10. A hot gas bypass defrosting method of an air source heat pump is characterized by comprising the following steps:
s1, the compressor operates in a frequency reduction mode, the No. 1 electromagnetic two-way valve is opened, and S2 is turned;
s2, directly leading hot gas of a compressor exhaust pipe to the fin heat exchanger for defrosting, and turning to S3;
s3, measuring the temperature of the coil of the fin heat exchanger in real time by using a coil temperature sensor, and turning to S4;
s4, judging whether defrosting is finished within a period of time, if so, turning to S5, if not, turning to S6;
s5, the compressor recovers normal frequency operation, and the No. 1 electromagnetic two-way valve is closed;
and (4) opening an S6:2 electromagnetic two-way valve, and enabling more hot air to enter the fin heat exchanger for defrosting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011314677.4A CN112413949A (en) | 2020-11-20 | 2020-11-20 | Hot gas bypass defrosting system and method for air source heat pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011314677.4A CN112413949A (en) | 2020-11-20 | 2020-11-20 | Hot gas bypass defrosting system and method for air source heat pump |
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| CN112413949A true CN112413949A (en) | 2021-02-26 |
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| CN202011314677.4A Pending CN112413949A (en) | 2020-11-20 | 2020-11-20 | Hot gas bypass defrosting system and method for air source heat pump |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1844807A (en) * | 2006-04-19 | 2006-10-11 | 东南大学 | Defrosting apparatus and method for air-source heat pump water chiller-heater unit |
| CN202835950U (en) * | 2012-10-10 | 2013-03-27 | 南京天加空调设备有限公司 | Air source heat pump water chilling unit provided with all-season refrigeration function |
| CN204494791U (en) * | 2015-02-26 | 2015-07-22 | 毛友根 | A kind of Frostless air-source heat pump hot water machine |
| CN104896757A (en) * | 2015-06-17 | 2015-09-09 | 合肥美的暖通设备有限公司 | Water heater and control method thereof |
| CN110469998A (en) * | 2019-07-28 | 2019-11-19 | 青岛海尔空调器有限总公司 | For the control method of air-conditioner defrosting, device and air-conditioning |
| CN110617625A (en) * | 2019-10-11 | 2019-12-27 | 广东纽恩泰新能源科技发展有限公司 | Heat pump water heater system with five capillary tubes and control method thereof |
-
2020
- 2020-11-20 CN CN202011314677.4A patent/CN112413949A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1844807A (en) * | 2006-04-19 | 2006-10-11 | 东南大学 | Defrosting apparatus and method for air-source heat pump water chiller-heater unit |
| CN202835950U (en) * | 2012-10-10 | 2013-03-27 | 南京天加空调设备有限公司 | Air source heat pump water chilling unit provided with all-season refrigeration function |
| CN204494791U (en) * | 2015-02-26 | 2015-07-22 | 毛友根 | A kind of Frostless air-source heat pump hot water machine |
| CN104896757A (en) * | 2015-06-17 | 2015-09-09 | 合肥美的暖通设备有限公司 | Water heater and control method thereof |
| CN110469998A (en) * | 2019-07-28 | 2019-11-19 | 青岛海尔空调器有限总公司 | For the control method of air-conditioner defrosting, device and air-conditioning |
| CN110617625A (en) * | 2019-10-11 | 2019-12-27 | 广东纽恩泰新能源科技发展有限公司 | Heat pump water heater system with five capillary tubes and control method thereof |
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Application publication date: 20210226 |