CN105020950A - Defrosting control method of multi-connected air conditioner unit - Google Patents
Defrosting control method of multi-connected air conditioner unit Download PDFInfo
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- CN105020950A CN105020950A CN201510415462.4A CN201510415462A CN105020950A CN 105020950 A CN105020950 A CN 105020950A CN 201510415462 A CN201510415462 A CN 201510415462A CN 105020950 A CN105020950 A CN 105020950A
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- expansion valve
- opened
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- organic electronic
- valve
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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
- 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
- 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
- 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
- F25B47/025—Defrosting cycles hot gas defrosting by reversing the 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
- 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
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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
- F25B2600/2513—Expansion valves
Abstract
The invention discloses a defrosting control method of a multi-connected air conditioner unit. The defrosting control method comprises the key steps that before a four-way reversing valve (6) carries out reversing to enter in a defrosting mode, an undercooling electronic expansion valve (4) is firstly opened to 300-480 paces, and a gas bypass solenoid valve (5) is opened; and after defrosting is finished, and before the four-way reversing valve (6) carries out reversing again to enter in a heating mode, the undercooling electronic expansion valve (4) also needs to be opened to 300-480 paces, and the gas bypass solenoid valve (5) is opened. According to the defrosting control method of the multi-connected air conditioner unit, noise is lowered, damage to an inverter compressor (1) and the four-way reversing valve (6) is lowered, and the service life of the inverter compressor (1) and the service life of the four-way reversing valve (6) are prolonged.
Description
Technical field
The present invention relates to VRF Air Conditioning System, is specifically a kind of multi-connected machine defrosting control method.
Background technology
The VRF Air Conditioning System of prior art is called for short multi-connected machine, and it comprises one or more off-premises station, multiple indoor set parallel with one another and connects two refrigerant circulation house stewards of each indoor set and off-premises station.If off-premises station is one, then this off-premises station is communicated with the multiple indoor sets after parallel connection by two refrigerant circulation house stewards; If off-premises station is multiple, then multiple off-premises station parallel connection is communicated with the multiple indoor sets after parallel connection by two refrigerant circulation house stewards afterwards.
Each off-premises station comprises compressor, oil eliminator, four-way change-over valve, outdoor heat exchanger while heating (during refrigeration be condenser be evaporimeter), outer organic electronic expansion valve and gas-liquid separator.Compressor outlet is communicated with the entrance of oil eliminator, the outlet of oil eliminator is communicated with the first valve port of four-way change-over valve, four-way change-over valve second valve port is communicated with outdoor heat exchanger one end, the outdoor heat exchanger other end is connected with one end of outer organic electronic expansion valve, one that the other end and two refrigerants of outer organic electronic expansion valve circulate in house steward is communicated with, and another root refrigerant circulation house steward in two refrigerant circulation house stewards is communicated with four-way change-over valve the 3rd valve port of off-premises station, four-way change-over valve the 4th valve port is connected with the entrance of gas-liquid separator, the outlet of gas-liquid separator is communicated with suction port of compressor.
Each indoor set comprises interior organic electronic expansion valve and indoor heat exchanger while heating (during refrigeration be evaporimeter be condenser), one end of indoor heat exchanger is communicated with one end of interior organic electronic expansion valve, one that the other end and two refrigerants of interior organic electronic expansion valve circulate in house steward is communicated with, and the house steward that circulates is communicated with for the other end and two refrigerants another root refrigerant circulated in house steward of indoor heat exchanger.
During refrigeration mode, the first valve port of four-way change-over valve is communicated with the second valve port, and the 3rd valve port is communicated with the 4th valve port, and namely refrigerant is along compressor, outdoor heat exchanger, indoor heat exchanger, the circulation of this route of compressor; During heating mode, the first valve port of four-way change-over valve is communicated with the 3rd valve port, and the second valve port is communicated with the 4th valve port, and refrigerant is along compressor, indoor heat exchanger, outdoor heat exchanger, the circulation of this route of compressor.
In cooling mode, may occur causing outdoor heat exchanger coil pipe to dispel the heat because outdoor environment temperature is too high difficult, outdoor heat exchanger inhales the situation of cold deficiency from the external world, at this moment, to each off-premises station set up a plate type heat exchanger and one with the cold branch line of mistake of cold electric expansion valve, off-premises station just has an initial pipeline to link refrigerant circulation house steward from outer organic electronic expansion valve outlet originally, and this initial pipeline enters from second mouthful of extraction from the first of plate type heat exchanger, and cross the entrance of cold branch line and be also connected with outer organic electronic expansion valve outlet and export and be connected with gas-liquid separator, and cross cold branch line and enter from second mouthful of plate type heat exchanger and draw from first.Like this, only need opened cold electric expansion valve, refrigerant is divided into two strands after outer organic electronic expansion valve flows out, first strand of refrigerant flows to indoor set through initial pipeline and plate type heat exchanger, and second strand of refrigerant passed through cold branch line and plate type heat exchanger is back to compressor, two strands of convection current refrigerants carried out secondary heat exchange in plate type heat exchanger, and second strand of refrigerant endothermic gasification returns compressor, first strand of refrigerant heat release fluidized flow, to indoor set, provides more cold to indoor set.
Be provided with a bypass line between the oil eliminator outlet of each off-premises station and suction port of compressor, bypass line is provided with the gas bypass solenoid valve controlling this pipeline break-make.
The defrost process of multi-connected machine in heating operations is very important.Especially in the winter time, outdoor temperature is low, under the environment of high humidity, the coil pipe of outdoor heat exchanger is easy to frosting.If frosting is thicker, just easily block the heat exchanger channels of outdoor heat exchanger and air, the serious heat transfer effect reducing outdoor heat exchanger.So can once defrost in the general interval of multi-connected machine for 40 ~ 80 minutes.And the defrost process of prior art is generally that four-way change-over valve commutation is entered into defrosting mode, inverted running refrigeration mode is with defrosting.But for multi-connected machine, its system indoor set, off-premises station number are more, and pipeline is longer, belong to large pipe-line system, the high-low pressure pressure reduction of large pipe-line system is general very large, during commutation, compressor and four-way change-over valve need bear very large pressure, produce larger noise, damage is to a certain degree caused to compressor and four-way change-over valve, and the frequency of system defrosting is relatively more frequent, the damage that compressor and four-way change-over valve are caused certainly will be strengthened, shorten its service life.
Summary of the invention
The technical problem to be solved in the present invention is, provides one to reduce noise, the multi-connected machine defrosting control method reducing the damage to compressor and four-way change-over valve, extend compressor and four-way change-over valve service life.
Technical solution of the present invention is, provide a kind of multi-connected machine defrosting control method, its concrete steps are as follows:
A, receive defrosting order when running under normal heating mode after, after frequency-changeable compressor is downconverted to 20 ~ 40Hz, run 20 ~ 60s, outer organic electronic expansion valve is opened to 100 ~ 200 steps, and interior organic electronic expansion valve is opened to 300 ~ 400 steps; Cross cold electric expansion valve to close;
B, frequency-changeable compressor shut down, cross cold electric expansion valve be opened to 300 ~ 480 steps, gas bypass solenoid valve is opened, continue 20 ~ 60s, inside and outside blower fan is all shut down, interior organic electronic expansion valve and outer organic electronic expansion valve opening all constant;
C, four-way change-over valve commutate, and will cross cold electric expansion valve and close with the speed of 10 ~ 32 steps/s, and be closed by gas bypass solenoid valve;
D, frequency-changeable compressor are with the frequency Defrost operation of 75 ~ 85Hz, and outer organic electronic expansion valve is opened to 250 ~ 450 steps, and interior organic electronic expansion valve is opened to 100 ~ 300 steps, and inside and outside blower fan all continues to shut down;
The defrosting of exiting first of e, satisfied following three conditions entered step f:1, defrosting time more than 10 minutes; 2, the temperature that defrosts is greater than 10 DEG C and continues 1 minute; 3, the temperature that defrosts is greater than 15 DEG C and continues 15s;
F, frequency-changeable compressor are shut down, and cross cold electric expansion valve and be opened to 300 ~ 480 steps, gas bypass solenoid valve is opened, and interior organic electronic expansion valve is opened to 0 ~ 60 step, and outer organic electronic expansion valve is opened to 250 ~ 450 steps, and continues 20 ~ 60s;
G, four-way change-over valve commutate, and cross the gentle bypass solenoid valve of cold electric expansion valve and close, interior organic electronic expansion valve is opened to 300 ~ 480 steps, and outer organic electronic expansion valve is opened to 100 ~ 200 steps;
H, frequency-changeable compressor start, and after running 3 ~ 5 minutes, run under entering into normal heating mode with 20 ~ 45Hz.
Adopt above method, multi-connected machine defrosting control method of the present invention compared with prior art, has the following advantages:
Utilize the method, before four-way change-over valve commutation, effectively reduce the pressure reduction between compressor high and low side, the pressure that when reducing commutation, compressor and four-way change-over valve need bear, reduce noise, avoid compressor and four-way change-over valve sustains damage, extend the service life of compressor and four-way change-over valve.Rareer is, the cold electric expansion valve of mistake that existed of the method Appropriate application, do not increase new parts, creationary by for increasing unit cold the cold electric expansion valve of mistake and cross cold branch line, give new function and efficacy, what art is good for strength solves the problem that when four-way change-over valve commutates, pressure reduction is excessive.
Accompanying drawing explanation
Fig. 1 is the systematic schematic diagram of multi-connected machine defrosting control method of the present invention.
Shown in figure 1, frequency-changeable compressor, 2, outer organic electronic expansion valve, 3, interior organic electronic expansion valve, 4, cross cold electric expansion valve, 5, gas bypass solenoid valve, 6, four-way change-over valve, 7, outdoor heat exchanger.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 1, multi-connected machine defrosting control method of the present invention, its concrete steps are as follows.
A, multi-connected machine receive defrosting order when running under normal heating mode after, after frequency-changeable compressor 1 is downconverted to 20 ~ 40Hz, run 20 ~ 60s, 30s is run as being downconverted to 30Hz, outer organic electronic expansion valve 2 is opened to 100 ~ 200 steps, as 150 steps, interior organic electronic expansion valve 3 is opened to 300 ~ 400 steps as 300 steps; Cross cold electric expansion valve 4 to close.
B, frequency-changeable compressor 1 are shut down; cross cold electric expansion valve 4 and be opened to 300 ~ 480 steps; as being opened to 350 steps; gas bypass solenoid valve 5 is opened; 20 ~ 60s is continued as lasting 30s under the state that above-mentioned two valves are all opened; under this state, inside and outside blower fan is all shut down, and interior organic electronic expansion valve 3 and outer organic electronic expansion valve 2 aperture all keep the aperture in step a constant.
C, four-way change-over valve 6 commutate, and will cross cold electric expansion valve 4 and close as the speed of 15 steps/s with 10 ~ 32 steps/s, and be closed by gas bypass solenoid valve 5.
D, frequency-changeable compressor 1 are with the frequency Defrost operation of 75 ~ 85Hz as 80Hz, and outer organic electronic expansion valve 2 is opened to 250 ~ 450 steps as 300 steps, and interior organic electronic expansion valve 3 is opened to 100 ~ 300 steps as 200 steps, and inside and outside blower fan all continues to shut down.
The defrosting of exiting first of e, satisfied following three conditions entered step f:1, defrosting time more than 10 minutes; 2, the temperature that defrosts is greater than 10 DEG C and continues 1 minute; 3, the temperature that defrosts is greater than 15 DEG C and continues 15s.Described defrosting temperature refers to, under defrosting mode, and the temperature on the temperature sensor of the coil outlet of outdoor heat exchanger 7.
F, frequency-changeable compressor 1 are shut down; cross cold electric expansion valve 4 and be opened to 300 ~ 480 steps as 350 steps, gas bypass solenoid valve 5 is opened, and interior organic electronic expansion valve 3 is opened to 0 ~ 60 step as 50 steps; outer organic electronic expansion valve 2 is opened to 250 ~ 450 steps as 300 steps, and continues 20 ~ 60s as 30s.
G, four-way change-over valve 6 commutate, and cross the gentle bypass solenoid valve 5 of cold electric expansion valve 4 and close, interior organic electronic expansion valve 3 is opened to 300 ~ 480 steps as 350 steps, and outer organic electronic expansion valve 2 is opened to 100 ~ 200 steps as 150 steps.
H, frequency-changeable compressor 1 start, and run after 3 ~ 5 minutes with 20 ~ 45Hz, after 30Hz runs 4 minutes, run under entering into normal heating mode.Inside and outside blower fan is all normally opened.
Claims (1)
1. a multi-connected machine defrosting control method, is characterized in that: its concrete steps are as follows:
A, receive defrosting order when running under normal heating mode after, after frequency-changeable compressor (1) is downconverted to 20 ~ 40Hz, run 20 ~ 60s, outer organic electronic expansion valve (2) is opened to 100 ~ 200 steps, and interior organic electronic expansion valve (3) is opened to 300 ~ 400 steps; Cross cold electric expansion valve (4) to close;
B, frequency-changeable compressor (1) are shut down, cross cold electric expansion valve (4) and be opened to 300 ~ 480 steps, gas bypass solenoid valve (5) is opened, continue 20 ~ 60s, inside and outside blower fan is all shut down, interior organic electronic expansion valve (3) and outer organic electronic expansion valve (2) aperture all constant;
C, four-way change-over valve (6) commutate, and will cross cold electric expansion valve (4) and close with the speed of 10 ~ 32 steps/s, and be closed by gas bypass solenoid valve (5);
D, frequency-changeable compressor (1) are with the frequency Defrost operation of 75 ~ 85Hz, and outer organic electronic expansion valve (2) is opened to 250 ~ 450 steps, and interior organic electronic expansion valve (3) is opened to 100 ~ 300 steps, and inside and outside blower fan all continues to shut down;
The defrosting of exiting first of e, satisfied following three conditions entered step f:1, defrosting time more than 10 minutes; 2, the temperature that defrosts is greater than 10 DEG C and continues 1 minute; 3, the temperature that defrosts is greater than 15 DEG C and continues 15s;
F, frequency-changeable compressor (1) are shut down, cross cold electric expansion valve (4) and be opened to 300 ~ 480 steps, gas bypass solenoid valve (5) is opened, interior organic electronic expansion valve (3) is opened to 0 ~ 60 step, outer organic electronic expansion valve (2) is opened to 250 ~ 450 steps, and continues 20 ~ 60s;
G, four-way change-over valve (6) commutate, cross cold electric expansion valve (4) gentle bypass solenoid valve (5) to close, interior organic electronic expansion valve (3) is opened to 300 ~ 480 steps, and outer organic electronic expansion valve (2) is opened to 100 ~ 200 steps;
H, frequency-changeable compressor (1) start, and after running 3 ~ 5 minutes, run under entering into normal heating mode with 20 ~ 45Hz.
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| CN201510415462.4A CN105020950B (en) | 2015-07-15 | 2015-07-15 | Multi-connected machine defrosting control method |
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| CN201510415462.4A CN105020950B (en) | 2015-07-15 | 2015-07-15 | Multi-connected machine defrosting control method |
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| CN105020950B CN105020950B (en) | 2017-09-05 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106196449A (en) * | 2016-07-13 | 2016-12-07 | 广东美的制冷设备有限公司 | A kind of air-conditioning defrost enters the control method for frequency of process, system and air-conditioning |
| CN106322581A (en) * | 2016-09-08 | 2017-01-11 | 广东美的暖通设备有限公司 | Multi-split air conditioner system and defrosting control method and defrosting control device of multi-split air conditioner system |
| CN106871378A (en) * | 2017-03-29 | 2017-06-20 | 广东美的暖通设备有限公司 | Determination methods and device that air-conditioner exchanges heat bad |
| CN107677017A (en) * | 2017-10-16 | 2018-02-09 | 南京天加环境科技有限公司 | A kind of control method of multi-joint captain's union defrosting |
| CN111473468A (en) * | 2020-04-24 | 2020-07-31 | 宁波奥克斯电气股份有限公司 | Control method and device for reducing noise through adjustment of outer valve and air conditioner |
| CN111473467A (en) * | 2020-04-24 | 2020-07-31 | 宁波奥克斯电气股份有限公司 | Control method and device for reducing noise by controlling differential pressure and air conditioner |
| WO2021103465A1 (en) * | 2019-11-27 | 2021-06-03 | 南京天加环境科技有限公司 | Multi-split system with double air-injection enthalpy-increasing compressors |
| WO2021135528A1 (en) * | 2020-01-02 | 2021-07-08 | 珠海格力电器股份有限公司 | Control method and device for air conditioner, air conditioning system, storage medium, and processor |
| CN114413416A (en) * | 2022-01-26 | 2022-04-29 | 宁波奥克斯电气股份有限公司 | Multi-split air conditioner defrosting control method, storage medium and multi-split air conditioner |
| CN114719395A (en) * | 2022-03-17 | 2022-07-08 | 浙江中广电器集团股份有限公司 | Control method for solving abnormal noise of internal machine after defrosting |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106196449A (en) * | 2016-07-13 | 2016-12-07 | 广东美的制冷设备有限公司 | A kind of air-conditioning defrost enters the control method for frequency of process, system and air-conditioning |
| CN106322581A (en) * | 2016-09-08 | 2017-01-11 | 广东美的暖通设备有限公司 | Multi-split air conditioner system and defrosting control method and defrosting control device of multi-split air conditioner system |
| CN106871378A (en) * | 2017-03-29 | 2017-06-20 | 广东美的暖通设备有限公司 | Determination methods and device that air-conditioner exchanges heat bad |
| CN106871378B (en) * | 2017-03-29 | 2019-12-20 | 广东美的暖通设备有限公司 | Method and device for judging poor heat exchange of air conditioner |
| CN107677017A (en) * | 2017-10-16 | 2018-02-09 | 南京天加环境科技有限公司 | A kind of control method of multi-joint captain's union defrosting |
| WO2021103465A1 (en) * | 2019-11-27 | 2021-06-03 | 南京天加环境科技有限公司 | Multi-split system with double air-injection enthalpy-increasing compressors |
| WO2021135528A1 (en) * | 2020-01-02 | 2021-07-08 | 珠海格力电器股份有限公司 | Control method and device for air conditioner, air conditioning system, storage medium, and processor |
| CN111473467A (en) * | 2020-04-24 | 2020-07-31 | 宁波奥克斯电气股份有限公司 | Control method and device for reducing noise by controlling differential pressure and air conditioner |
| CN111473468A (en) * | 2020-04-24 | 2020-07-31 | 宁波奥克斯电气股份有限公司 | Control method and device for reducing noise through adjustment of outer valve and air conditioner |
| CN111473468B (en) * | 2020-04-24 | 2021-07-16 | 宁波奥克斯电气股份有限公司 | Control method and device for reducing noise through adjustment of outer valve and air conditioner |
| CN111473467B (en) * | 2020-04-24 | 2021-09-21 | 宁波奥克斯电气股份有限公司 | Control method and device for reducing noise by controlling differential pressure and air conditioner |
| CN114413416A (en) * | 2022-01-26 | 2022-04-29 | 宁波奥克斯电气股份有限公司 | Multi-split air conditioner defrosting control method, storage medium and multi-split air conditioner |
| CN114413416B (en) * | 2022-01-26 | 2023-04-25 | 宁波奥克斯电气股份有限公司 | Defrosting control method for multi-split air conditioner, storage medium and multi-split air conditioner |
| CN114719395A (en) * | 2022-03-17 | 2022-07-08 | 浙江中广电器集团股份有限公司 | Control method for solving abnormal noise of internal machine after defrosting |
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| CN105020950B (en) | 2017-09-05 |
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