CN103542459B - Defrost method when cold-heat frequency-conversion air conditioner and heating operation - Google Patents

Defrost method when cold-heat frequency-conversion air conditioner and heating operation Download PDF

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Publication number
CN103542459B
CN103542459B CN201310548422.8A CN201310548422A CN103542459B CN 103542459 B CN103542459 B CN 103542459B CN 201310548422 A CN201310548422 A CN 201310548422A CN 103542459 B CN103542459 B CN 103542459B
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indoor
valve
heat exchanger
outdoor
compressor
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CN103542459A (en
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孙汉志
谭洪娟
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Hisense Shandong Air Conditioning Co Ltd
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Hisense Shandong Air Conditioning Co Ltd
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Abstract

The invention provides a kind of cold-heat frequency-conversion air conditioner, comprise indoor set, off-premises station, coolant connecting tube, by two-way stop valve between indoor set and off-premises station, three-way cut-off valve and online pipe connect, described indoor set comprises indoor heat exchanger, indoor fan, indoor controller, described off-premises station comprises frequency-changeable compressor, outdoor heat exchanger, outdoor fan, outdoor controller, cross valve, between outdoor heat exchanger and indoor heat exchanger, electric expansion valve is set, described coolant connecting tube is communicated with indoor heat exchanger, outdoor heat exchanger, cross valve, frequency-changeable compressor, electric expansion valve, two-way stop valve, three-way cut-off valve realizes refrigeration, heat circulation, between described compressor suction and cross valve, heater is set.Present invention also offers above-mentioned air conditioner heat-production run time do not shut down Defrost method.When the present invention can realize heating, compressor does not shut down defrosting, and realizes the not obvious decline of indoor temperature, improves the operational efficiency of room comfortableness and system.

Description

Defrost method when cold-heat frequency-conversion air conditioner and heating operation
Technical field
The invention belongs to air conditioning and refrigeration field of engineering technology, specifically, relate to a kind of Defrost method when there is the cold-heat frequency-conversion air conditioner and heating operation of not shutting down defrosting.
Background technology
Be the heating operation systemic circulation process of traditional heating and air conditioner as shown in Figure 1, arrow is refrigerant flow direction.When system controller detection judges that outdoor heat converter need defrost; the defrosting form of tradition heating and air conditioner adopts reverse circulation Defrost mode (as shown in Figure 2); compressor frequency reducing or directly shut down; indoor and outdoor fan stops; compressor start (refrigeration mode: high temperature, high-pressure gas flow are to external heat exchanger) after cross valve commutation; defrost; after controller judges that defrosting is clean; compressor shutdown; cross valve commutation (heating mode), compressor start, outdoor fan starts; indoor fan controls to start by anti-cold wind, reenters and heats circular flow.Due to during defrosting, heating operation stops, first the HTHP refrigerant ejected from compressor enters outdoor heat exchanger, defrost, discharge heat, the low-temp low-pressure refrigerant after electric expansion valve throttling enters indoor heat converter, heat in inevitable absorption chamber, cause indoor temperature to decline obviously, thus affect user's comfortableness.Due in defrost process, system will be stopped through twice compressor, the running efficiency of influential system.
Summary of the invention
The object of the invention is to the shortcoming and defect solving above-mentioned prior art, a kind of Defrost method that can realize when not shutting down cold-heat frequency-conversion air conditioner and the heating operation of defrosting when heating is provided.
In order to solve the problems of the technologies described above, technical scheme of the present invention is,
A kind of cold-heat frequency-conversion air conditioner, comprise indoor set, off-premises station, coolant connecting tube, by two-way stop valve between indoor set and off-premises station, three-way cut-off valve and online pipe connect, described indoor set comprises indoor heat exchanger, indoor fan, indoor controller, described off-premises station comprises frequency-changeable compressor, outdoor heat exchanger, outdoor fan, outdoor controller, cross valve, between outdoor heat exchanger and indoor heat exchanger, electric expansion valve is set, described coolant connecting tube is communicated with indoor heat exchanger, outdoor heat exchanger, cross valve, frequency-changeable compressor, electric expansion valve, two-way stop valve, three-way cut-off valve realizes refrigeration, heat circulation, between described compressor suction and cross valve, heater is set.
Further, described outdoor heat exchanger is arranged defrost sensor and ring temperature sensor.
Again further, described heater adopts electric heating tube, and electric heating tube is arranged on around compressor return air pipe.The two ends of electric heating tube connect power supply respectively.Described heater can also be other heating appliances.
Due to heater of having connected between compressor suction and cross valve, make system when needs defrost, heater is opened, and defrost terminates rear closedown, achieves compressor and does not shut down defrosting.Outdoor controller by setting Programmable detection temperature and other condition criterion air-conditionings the need of defrosting.
Defrost method during cold-heat frequency-conversion air conditioner heating operation, according to the temperature that the defrost sensor on outdoor heat exchanger and ring temperature sensor detect, when judging that air-conditioning need defrost, air-conditioning enters does not shut down heating and defrosting state:
(1) first indoor fan reduction of speed, run with gentle breeze or stop, outdoor fan shuts down;
(2) electric expansion valve is opened to maximum (aperture the most very much not plays throttling action), heat exchanger high-temperature gas out indoor, outdoor heat exchanger is got back to through two-way stop valve, electric expansion valve, carry out heat exchange, realize defrost, refrigerant becomes liquid from gas, heater is got back to through cross valve, after absorption heater provides heat, be evaporated to gas, get back to compressor;
(3) enter the refrigerant of compressor, through compressor compresses, discharge with high-temperature high-pressure state, enter indoor heat exchanger through cross valve, three-way cut-off valve, complete a defrost cycle;
(4) when the defrost sensor on outdoor heat exchanger and ring temperature sensor detect that off-premises station defrosting is complete, outdoor fan operates, and electric expansion valve resets, and heater disconnects, and indoor fan runs by the program of setting.System enters and heats operating condition normally.Defrosting is not shut down when above method realizes air conditioner heat-production.
The present invention compared with prior art has the following advantages and good effect:
When the present invention can realize heating, compressor does not shut down defrosting, and realizes the not obvious decline of indoor temperature, improves the operational efficiency of room comfortableness and system.
Accompanying drawing explanation
Fig. 1 is the systemic circulation schematic diagram of existing air-conditioner;
Fig. 2 is that existing air-conditioner adopts traditional inverse defrosting system flow chart;
Fig. 3 is the systematic cyclic graph of cold-heat frequency-conversion air conditioner of the present invention;
Defrosting flow chart is not shut down when Fig. 4 is cold-heat frequency-conversion air conditioner heating operation of the present invention;
Fig. 5 is the structural representation of described heater.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further detailed explanation.
As shown in Figure 3, in a kind of systematic cyclic graph of cold-heat frequency-conversion air conditioner, the direction of arrow represents flow of refrigerant direction when heating.
This air-conditioner comprises indoor set 1, off-premises station 2, coolant connecting tube 3, indoor set 1 comprises indoor heat exchanger 11, indoor fan 12, indoor controller, off-premises station 2 comprises frequency-changeable compressor 21, outdoor heat exchanger 22, outdoor fan 23, outdoor controller, cross valve 24, two-way stop valve 4 and electric expansion valve 5 are set between outdoor heat exchanger 22 and indoor heat exchanger 11, three-way cut-off valve 6 is set between indoor heat exchanger 11 and cross valve 24, coolant connecting tube 3 is communicated with above-mentioned parts and realizes complete refrigeration, heat circulation, cascade heater 7 between compressor 21 suction inlet and cross valve 24.Outdoor heat exchanger 22 is arranged defrost sensor and ring temperature sensor.
As shown in Figure 5, heater 7 has electric heating tube, and electric heating tube is looped around around compressor return air pipe.The two ends of electric heating tube connect power supply respectively.
As shown in Figure 4, realizing off-premises station when heating, not shut down the step of defrosting as follows:
When system receives heating operation instruction, outdoor fan runs, and cross valve commutates, compressor start, the high temperature and high pressure gas ejected from compressor enters indoor heat exchanger through cross valve, three-way cut-off valve, is rotated by indoor fan, take away air quantity, realize heat exchange; Reduced by the refrigerant temperature of indoor heat exchanger, liquid is become, through two-way stop valve, by electric expansion valve throttling by high temperature, gases at high pressure, become Low temperature low pressure liquid, get back to outdoor heat exchanger, in heat exchanger, by absorbing heat, be evaporated to gas, by cross valve, get back to compressor, complete a circulation;
When the defrost sensor on outdoor heat exchanger and ring temperature sensor detect that outdoor machine system needs to defrost, first indoor fan reduction of speed, runs with gentle breeze; Outdoor fan shuts down; Electric expansion valve opens (aperture is maximum).Heat exchanger high-temperature gas out, gets back to outdoor unit heat exchanger through two-way stop valve, electric expansion valve indoor, carries out heat exchange, realizes defrost.Refrigerant becomes liquid from gas, by outdoor heat exchanger refrigerant out, through cross valve to heater, after absorption heater provides heat, is evaporated to gas, gets back to compressor, complete a circulation;
When the defrost sensor on outdoor heat exchanger and ring temperature sensor detect that off-premises station defrosting is complete, outdoor fan operates, and electric expansion valve resets, and indoor fan runs by the program of setting.System enters and heats operating condition normally.
The above is only preferred embodiment of the present invention, and be not restriction the present invention being made to other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the Equivalent embodiments of equivalent variations.But everyly do not depart from technical solution of the present invention content, any simple modification, equivalent variations and the remodeling done above embodiment according to technical spirit of the present invention, still belong to the protection domain of technical solution of the present invention.

Claims (4)

1. a cold-heat frequency-conversion air conditioner, comprise indoor set, off-premises station, coolant connecting tube, by two-way stop valve between indoor set and off-premises station, three-way cut-off valve and online pipe connect, described indoor set comprises indoor heat exchanger, indoor fan, indoor controller, described off-premises station comprises frequency-changeable compressor, outdoor heat exchanger, outdoor fan, outdoor controller, cross valve, between outdoor heat exchanger and indoor heat exchanger, electric expansion valve is set, described coolant connecting tube is communicated with indoor heat exchanger, outdoor heat exchanger, cross valve, frequency-changeable compressor, electric expansion valve, two-way stop valve, three-way cut-off valve realizes refrigeration, heat circulation, it is characterized in that: between described compressor suction and cross valve, heater is set.
2. cold-heat frequency-conversion air conditioner according to claim 1, is characterized in that: described outdoor heat exchanger is arranged defrost sensor and ring temperature sensor.
3. cold-heat frequency-conversion air conditioner according to claim 2, is characterized in that: described heater adopts electric heating tube, is arranged on around compressor return air pipe.
4. Defrost method during cold-heat frequency-conversion air conditioner heating operation, is characterized in that: the temperature detected according to the defrost sensor on outdoor heat exchanger and ring temperature sensor, and when judging that air-conditioning need defrost, air-conditioning enters does not shut down heating and defrosting state:
(1) first indoor fan reduction of speed, run with gentle breeze or stop, outdoor fan shuts down;
(2) electric expansion valve is opened, heat exchanger high-temperature gas out indoor, outdoor heat exchanger is got back to through two-way stop valve, electric expansion valve, carry out heat exchange, realize defrost, refrigerant becomes liquid from gas, heater is got back to through cross valve, after absorption heater provides heat, be evaporated to gas, get back to compressor;
(3) enter the refrigerant of compressor, through compressor compresses, discharge with high-temperature high-pressure state, enter indoor heat exchanger through cross valve, three-way cut-off valve, complete a circulation;
(4) when the defrost sensor on outdoor heat exchanger and ring temperature sensor detect that off-premises station defrosting is complete, outdoor fan operates, and electric expansion valve resets, and heater disconnects, and indoor fan runs by the program of setting, and system enters and heats operating condition normally.
CN201310548422.8A 2013-11-08 2013-11-08 Defrost method when cold-heat frequency-conversion air conditioner and heating operation Active CN103542459B (en)

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* Cited by examiner, † Cited by third party
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CN105042936A (en) * 2015-07-02 2015-11-11 合肥美的电冰箱有限公司 Refrigerant circulation system and refrigeration equipment
CN106594991A (en) * 2016-12-19 2017-04-26 广东美的制冷设备有限公司 Defrosting control method, defrosting control device and air conditioner
CN110437375B (en) * 2019-07-08 2021-04-30 陕西中医药大学 Molecularly imprinted polymer for separating and purifying panax japonicus saponin IVa and preparation method thereof
CN110470016A (en) * 2019-08-03 2019-11-19 青岛海尔空调器有限总公司 Control method and device, air-conditioning for air-conditioner defrosting
CN110553437A (en) * 2019-09-02 2019-12-10 全谷制冷空调(上海)有限公司 Hot defrosting direct current frequency conversion compression condensing unit
CN110553438A (en) * 2019-09-02 2019-12-10 全谷制冷空调(上海)有限公司 Unit type refrigerator
CN111412637A (en) * 2020-04-07 2020-07-14 珠海格力电器股份有限公司 Control method and control device of air conditioner and heat pump air conditioner
CN112594867A (en) * 2020-12-10 2021-04-02 珠海格力电器股份有限公司 Defrosting control method, device and system of air conditioner and nonvolatile storage medium

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JP2005083711A (en) * 2003-09-10 2005-03-31 Shinko Kogyo Co Ltd Defrosting device of heat pump type air conditioner and defrosting method
CN102401519A (en) * 2010-09-16 2012-04-04 乐金电子(天津)电器有限公司 Outdoor unit of air conditioner
CN103851752A (en) * 2012-12-04 2014-06-11 邯郸美的制冷设备有限公司 Air conditioner and control method thereof

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
JP2005083711A (en) * 2003-09-10 2005-03-31 Shinko Kogyo Co Ltd Defrosting device of heat pump type air conditioner and defrosting method
CN102401519A (en) * 2010-09-16 2012-04-04 乐金电子(天津)电器有限公司 Outdoor unit of air conditioner
CN103851752A (en) * 2012-12-04 2014-06-11 邯郸美的制冷设备有限公司 Air conditioner and control method thereof

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