CN101458027A - Defrosting method and device for multi-connection air conditioner - Google Patents
Defrosting method and device for multi-connection air conditioner Download PDFInfo
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- CN101458027A CN101458027A CNA2007101957320A CN200710195732A CN101458027A CN 101458027 A CN101458027 A CN 101458027A CN A2007101957320 A CNA2007101957320 A CN A2007101957320A CN 200710195732 A CN200710195732 A CN 200710195732A CN 101458027 A CN101458027 A CN 101458027A
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Abstract
The invention discloses a multiple air-conditioner defrosting method. The method comprises the following procedures: one or a plurality of outdoor air-conditioners in the multiple air-conditioning unit automatically judges whether the defrosting condition is satisfied in the thermal operation and if yes, the multiple air-conditioning enters the defrosting state; the outdoor air-conditioner automatically judges whether the condition for quitting the defrosting operation is satisfied in the defrosting process and if yes, the outdoor air-conditioner quits the defrosting operation and converts to the thermal operation. Through the method and device of the embodiment of the invention, the outdoor air-conditioners automatically judge whether the condition for quitting the defrosting operation is satisfied after the multiple air-conditioning unit enters the defrosting operation and if yes, the outdoor air-conditioner directly converts to the thermal operation; the high-temperature refrigerant output with the outdoor air-conditioner after entering the thermal operation can accelerate the defrosting of the outdoor air-conditioner still in the defrosting operation, thus reducing the liquid compression hidden troubles of compressor in the defrosting period to certain extent and effectively shortening the continuous time of the unit defrosting process.
Description
Technical field
The present invention relates to air conditioner, relate in particular to a kind of combined air conditioners machine frost eliminating method and device.
Background technology
The combined air conditioners unit is in parallel and many single cooling cycle systems that indoor set composes in parallel by many off-premises stations.In that environment temperature is low when heating running, the situation of frosting appears in the off-premises station heat exchanger of running easily.The outdoor heat exchanger frosting will make its exchange capability of heat descend greatly, thereby causes the indoor heating deleterious of system.When the heat exchanger frosting acquired a certain degree, it is very poor that the indoor set heating effect will become, even blow a cold wind over.At this moment just need remove the frost of tying on the outdoor heat exchanger,, improve the heating effect of indoor set with the heat exchange effect in the recovery room outside.Air-cooled heat pump formula air-conditioning system generally all is the mode that switches to refrigeration by the cross valve commutation, carries out the defrosting of outdoor heat exchanger.In the process of defrosting, can not provide heat to the indoor, but also need absorb a part of heat from the indoor.
Present air-cooled heat pump formula multi-gang air conditioner, the off-premises station in the unit generally all are to enter defrosting running simultaneously, have removed to withdraw from simultaneously to defrost behind the frost to turn round again.Such Defrost mode has following defective:
(1) because each off-premises station running capacity may be different with the duration of runs, the frosting degree of its heat exchanger also can be different, if each the off-premises station defrosting running in the unit enters simultaneously, withdraws from simultaneously, the then outer machine of frost-free or the very fast few outer machine of frosting that frost is eliminated, need proceed the defrosting running, wait for after other outer machines have removed frost and withdrawing from together.Will cause waste of electric energy like this, also not have help improving the indoor heating effect.
(2) such Defrost mode also can make and a large amount of evaporate not completely that liquid refrigerants accumulates in the gas-liquid separator of compressor low-pressure side, the potential safety hazard that makes compressor exist hydraulic pressure to contract.And owing to there is not the refrigerant of evaporation to accumulate in the gas-liquid separator of system in a large number, it is on the low side to cause defrosting to finish to enter when heating running system's refrigerant circulation, make system low-voltage pressure and condensing pressure on the low side, thereby can cause indoor heating effect in defrosting finishes the back a very long time very poor.
Summary of the invention
The invention provides a kind of combined air conditioners machine frost eliminating method and device, with the overlong time of resolution system Defrost operation, the problem that the indoor heating effect is exerted an influence.
For achieving the above object, the embodiment of the invention provides a kind of combined air conditioners machine frost eliminating method, may further comprise the steps:
One or more off-premises stations in the combined air conditioners unit judge whether to meet the defrosting condition in heating operation process voluntarily, if meet the defrosting condition, then enter defrost state;
Described off-premises station judges whether to meet the defrosting exit criteria in defrost process voluntarily, if meet the condition that defrosting is withdrawed from, then withdraws from the defrosting running, switches to and heats running.
Described off-premises station judges whether also to comprise after meeting the defrosting condition voluntarily:
If do not meet the defrosting condition, described off-premises station keeps heating operating condition.
Described off-premises station judges whether to meet the defrosting condition voluntarily and is specially:
Described off-premises station judges whether to meet the defrosting condition according to the parameter on outdoor environment temperature sensor and the heat exchanger sensor.
Described off-premises station also comprises after withdrawing from the defrosting running:
The high temperature refrigerant gas of described off-premises station output promotes the defrost process of other off-premises stations.
The embodiment of the invention also provides a kind of multi-connected air conditioner defroster, comprising:
The defrosting judging unit is used for heating operation process, judges whether to meet the defrosting condition, if meet the defrosting condition, then notifies the defrosting control module;
The defrosting control module after being used to receive the notice of described defrosting judging unit, is carried out the defrosting running;
Withdraw from judging unit, be used for, judge whether to meet the defrosting exit criteria,, then notify switch unit if meet the condition that defrosting is withdrawed from defrost process;
Switch unit, be used to receive the notice that withdraws from described judging unit after, withdrawing from defrosting running, switch to and heat running.
Compared with prior art, embodiments of the invention have the following advantages:
After the combined air conditioners unit enters the defrosting running, judge voluntarily by each off-premises station whether it meets the defrosting exit criteria, the off-premises station that meets the exit criteria that defrosts directly switches to and heats running, the high temperature refrigerant that enters the off-premises station output that heats after the running can promote still to accelerate defrosting speed at the off-premises station of the running that defrosts, reduce the hidden danger that compressor hydraulic pressure contracts during defrosting to a certain extent, shortened the time that the unit defrost process continues effectively.
Description of drawings
Fig. 1 is a kind of combined air conditioners machine frost eliminating method flow chart of the embodiment of the invention;
Fig. 2 be the off-premises station 3 of the embodiment of the invention one switch to heat running after, combined air conditioners unit defrost process schematic diagram;
Fig. 3 is a kind of multi-connected air conditioner defroster schematic diagram of the embodiment of the invention two.
The specific embodiment
The defrost process of off-premises station is actually a kind of exothermic process of outdoor heat exchanger, and meanwhile the indoor set heat exchanger is an endothermic process, promptly indoor heat exchanger in defrost process at the heat of absorption chamber inboard, so the indoor temperature will reduce in defrost process.Therefore, the time of system's Defrost operation is short more, and is also just more little to the influence of indoor heating effect.Adopt combined air conditioners machine frost eliminating method provided by the invention and device, the off-premises station that meets the defrosting condition is after entering the defrosting running, each off-premises station judges voluntarily whether it needs to withdraw from the defrosting running, reach the off-premises station that withdraws from the defrosting operating condition earlier and withdraw from the defrosting running earlier, withdraw to enter immediately after defrosting is turned round heating running, do not proceed the defrosting running and reach the off-premises station that withdraws from the defrosting operating condition.After the off-premises station that withdraws from the defrosting running earlier enters and heats running, its outdoor heat exchanger will absorb heat from the outside, the high temperature refrigerant of its exhaust side enters the off-premises station low-pressure side of the running that defrosts, the refrigerant liquid of the off-premises station low-pressure side that promotion is defrosting fully evaporates, with the low pressure and the suction superheat of the off-premises station that improves the running that defrosting, reduce the caloric receptivity of indoor machine evaporation simultaneously.Therefore, the condensing pressure and the delivery temperature of the off-premises station of the running that defrosting will be improved rapidly, thereby the off-premises station defrosting speed that is turning round is accelerated, and realize the purpose of quickly defrosting.
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.
In the embodiments of the invention one, system is an example with the multi-joint machine of single outer machine list press, a kind of combined air conditioners machine frost eliminating method as shown in Figure 1, concrete steps are as follows:
One or more off-premises stations in step S101, the combined air conditioners unit judge whether to meet the defrosting condition in heating operation process voluntarily, if meet the defrosting condition, change step S102, otherwise keep current operating condition.
Concrete, off-premises station can judge whether to meet the defrosting condition by the parameter on outdoor environment temperature sensor and the heat exchanger sensor.
If step S102 off-premises station meets the defrosting condition, then enter the defrosting operating condition.
Off-premises station 1, off-premises station 2 and off-premises station 3 in the present embodiment in the hypothesis combined air conditioners unit meet the defrosting condition simultaneously, then enter defrost state simultaneously, and promptly the heat exchanger of off-premises station 1, off-premises station 2 and off-premises station 3 carries out the heat release defrost process.
Step S103, in the off-premises station defrost process, judge whether voluntarily to meet the defrosting exit criteria, if meet the defrosting exit criteria, change step S104, otherwise keep defrost state.
If step S104 meets the defrosting exit criteria, off-premises station directly switches to and heats running.
Hypothesis off-premises station 3 meets the defrosting exit criteria the earliest in the present embodiment, and off-premises station 3 directly commutates this its cross valve, switches to and heats running, and off-premises station 1 and off-premises station 2 are proceeded the defrosting running.At this moment, the heat exchanger of off-premises station 1 and off-premises station 2 is proceeded the heat release defrost process, and 3 of off-premises stations are heating running from the outside heat absorption.
After off-premises station 3 switches to and heats running, combined air conditioners unit defrost process as shown in Figure 2, the high temperature refrigerant gas of exporting from the exhaust side of off-premises station 3 flows according to the direction shown in Fig. 2 hollow core arrow, it is the low-pressure side gas-liquid separator that off-premises station 1 that a part of high temperature refrigerant gas flow is defrosting closes off-premises station 2, another part high temperature refrigerant gas flow indoor evaporimeter, promoted the refrigerant liquid of low-pressure side of the off-premises station that defrosting and the refrigerant liquid in the indoor heat exchanger fully to evaporate, therefore, the condensing pressure and the delivery temperature of off-premises station of running of defrosting will improve rapidly, thereby the defrosting speed of outdoor unit also obtains accelerating.
Simultaneously, mobile from the cold-producing medium that the exhaust side of off-premises station 1 and off-premises station 2 is exported according to the direction of filled arrows Fig. 2, in its outdoor heat exchanger, carried out the liquid refrigerant of heat release, a part flows to the indoor, carry out throttling and evaporation in the indoor, another part flows to off-premises station 3, after the electric expansion valve throttling by off-premises station 3, in the heat exchanger of off-premises station 3, evaporate heat absorption, thereby reduced the caloric receptivity of cold-producing medium, avoided indoor set effect decline during defrosting to a certain extent in the indoor evaporation.
Step S105, when all off-premises stations all meet when withdrawing from the defrosting condition, the combined air conditioners unit enters and normally heats operating condition.
After after a while, if a certain in off-premises station 1 and the off-premises station 2 has also met the defrosting condition that withdraws from, then equally directly enter and heat running with off-premises station 3, owing to withdraw from the off-premises station of defrosting running earlier, the high temperature refrigerant of exhaust side is discharged to the off-premises station low-pressure side and the indoor evaporator of defrosting running, the liquid refrigerants that accumulates is fully evaporated, finish in the defrosting of whole unit and to enter when heating running, to not have in the system in the gas-liquid separator that a large amount of refrigerants accumulate in low-pressure side, therefore the refrigerant circulation of system will compare abundance, and the indoor can reach better effects very soon after defrosting.
According to above-mentioned deterministic process, all meet when withdrawing from the defrosting condition until all off-premises stations, the combined air conditioners unit enters and normally heats operating condition.
Above embodiment with the multi-joint machine of single outer machine list press system be example the present invention will be described, be understandable that the present invention also is applicable to the multi-joint machine system of single outer machine multiple pressure machine, its implementation and the multi-joint machine system class of single outer machine list press seemingly repeat no more.
The method that provides by the foregoing description, after the combined air conditioners unit enters the defrosting running, judge voluntarily by each off-premises station whether it meets the defrosting exit criteria, the off-premises station that meets the exit criteria that defrosts directly switches to and heats running, the high temperature refrigerant that enters the off-premises station output that heats after the running can promote still to accelerate defrosting speed at the off-premises station of the running that defrosts, reduce the hidden danger that compressor hydraulic pressure contracts during defrosting to a certain extent, shortened the time that the unit defrost process continues effectively.
In the embodiments of the invention two, a kind of multi-connected air conditioner defroster comprises as shown in Figure 3:
Defrosting judging unit 10 is used for heating operation process, judges whether to meet the defrosting condition, if meet the defrosting condition, then notifies defrosting control module 20.
Defrosting control module 20 after being used to receive the notice of defrosting judging unit 10, is carried out the defrosting running.
Withdraw from judging unit 30, be used for, judge whether to meet the defrosting exit criteria,, then notify switch unit 40 if meet the condition that defrosting is withdrawed from defrost process.
Switch unit 40, be used to receive the notice that withdraws from judging unit 30 after, withdrawing from defrosting running, switch to and heat running.
The device that provides by the foregoing description, after the combined air conditioners unit enters the defrosting running, judge voluntarily by each off-premises station whether it meets the defrosting exit criteria, the off-premises station that meets the exit criteria that defrosts directly switches to and heats running, the high temperature refrigerant that enters the off-premises station output that heats after the running can promote still to accelerate defrosting speed at the off-premises station of the running that defrosts, reduce the hidden danger that compressor hydraulic pressure contracts during defrosting to a certain extent, shortened the time that the unit defrost process continues effectively.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better embodiment under a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this obtains the machine software product and is stored in the storage medium, comprises that some instructions are used so that a station terminal equipment is carried out the described method of each embodiment of the present invention.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (5)
1, a kind of combined air conditioners machine frost eliminating method is characterized in that, may further comprise the steps:
One or more off-premises stations in the combined air conditioners unit judge whether to meet the defrosting condition in heating operation process voluntarily, if meet the defrosting condition, then enter defrost state;
Described off-premises station judges whether to meet the defrosting exit criteria in defrost process voluntarily, if meet the condition that defrosting is withdrawed from, then withdraws from the defrosting running, switches to and heats running.
2, combined air conditioners machine frost eliminating method according to claim 1 is characterized in that described off-premises station judges whether also to comprise after meeting the defrosting condition voluntarily:
If do not meet the defrosting condition, described off-premises station keeps heating operating condition.
3, combined air conditioners machine frost eliminating method according to claim 1 is characterized in that described off-premises station judges whether to meet the defrosting condition voluntarily and is specially:
Described off-premises station judges whether to meet the defrosting condition according to the parameter on outdoor environment temperature sensor and the heat exchanger sensor.
4, combined air conditioners machine frost eliminating method according to claim 1 is characterized in that, described off-premises station also comprises after withdrawing from the defrosting running:
The high temperature refrigerant gas of described off-premises station output promotes the defrost process of other off-premises stations.
5, a kind of multi-connected air conditioner defroster is characterized in that, comprising:
The defrosting judging unit is used for heating operation process, judges whether to meet the defrosting condition, if meet the defrosting condition, then notifies the defrosting control module;
The defrosting control module after being used to receive the notice of described defrosting judging unit, is carried out the defrosting running;
Withdraw from judging unit, be used for, judge whether to meet the defrosting exit criteria,, then notify switch unit if meet the condition that defrosting is withdrawed from defrost process;
Switch unit, be used to receive the notice that withdraws from described judging unit after, withdrawing from defrosting running, switch to and heat running.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101957320A CN101458027A (en) | 2007-12-13 | 2007-12-13 | Defrosting method and device for multi-connection air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101957320A CN101458027A (en) | 2007-12-13 | 2007-12-13 | Defrosting method and device for multi-connection air conditioner |
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| CN101458027A true CN101458027A (en) | 2009-06-17 |
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| CNA2007101957320A Pending CN101458027A (en) | 2007-12-13 | 2007-12-13 | Defrosting method and device for multi-connection air conditioner |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102878737A (en) * | 2012-10-10 | 2013-01-16 | 南京天加空调设备有限公司 | Method for implementing normal heating of indoor units of modular multi-unit device during defrosting |
| CN103225851A (en) * | 2013-04-27 | 2013-07-31 | 青岛海尔空调电子有限公司 | Multi-connected air-conditioning system with coordinated defrosting function |
| CN106524412A (en) * | 2016-11-09 | 2017-03-22 | 重庆美的通用制冷设备有限公司 | Air conditioning unit defrosting controlling method and device and air conditioner |
| CN106765617A (en) * | 2017-02-21 | 2017-05-31 | 广东美的暖通设备有限公司 | Air injection enthalpy-increasing heat pump type air conditioning system, control method, control device and air-conditioner |
| CN108759150A (en) * | 2018-05-09 | 2018-11-06 | 特灵空调系统(中国)有限公司 | Air-conditioning system and its control method |
| CN111895654A (en) * | 2020-06-24 | 2020-11-06 | 青岛海尔新能源电器有限公司 | Control method and control device of heat pump water heater |
| CN113614463A (en) * | 2019-03-25 | 2021-11-05 | 三菱电机株式会社 | Air conditioner |
| CN113932473A (en) * | 2021-11-24 | 2022-01-14 | 宁波奥克斯电气股份有限公司 | Multi-machine parallel low-temperature heat pump defrosting device, defrosting method and air conditioner |
| WO2022127309A1 (en) * | 2020-12-17 | 2022-06-23 | 珠海格力电器股份有限公司 | Defrosting control method and device, and vrf air conditioner |
-
2007
- 2007-12-13 CN CNA2007101957320A patent/CN101458027A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102878737A (en) * | 2012-10-10 | 2013-01-16 | 南京天加空调设备有限公司 | Method for implementing normal heating of indoor units of modular multi-unit device during defrosting |
| CN102878737B (en) * | 2012-10-10 | 2015-01-14 | 南京天加空调设备有限公司 | Method for implementing normal heating of indoor units of modular multi-unit device during defrosting |
| CN103225851A (en) * | 2013-04-27 | 2013-07-31 | 青岛海尔空调电子有限公司 | Multi-connected air-conditioning system with coordinated defrosting function |
| CN103225851B (en) * | 2013-04-27 | 2015-07-29 | 青岛海尔空调电子有限公司 | A kind of multi-gang air conditioner working in coordination with defrosting |
| CN106524412A (en) * | 2016-11-09 | 2017-03-22 | 重庆美的通用制冷设备有限公司 | Air conditioning unit defrosting controlling method and device and air conditioner |
| CN106765617A (en) * | 2017-02-21 | 2017-05-31 | 广东美的暖通设备有限公司 | Air injection enthalpy-increasing heat pump type air conditioning system, control method, control device and air-conditioner |
| CN106765617B (en) * | 2017-02-21 | 2019-08-30 | 广东美的暖通设备有限公司 | Air injection enthalpy-increasing heat pump air conditioning system, control method, control device and air conditioner |
| CN108759150A (en) * | 2018-05-09 | 2018-11-06 | 特灵空调系统(中国)有限公司 | Air-conditioning system and its control method |
| CN113614463A (en) * | 2019-03-25 | 2021-11-05 | 三菱电机株式会社 | Air conditioner |
| CN111895654A (en) * | 2020-06-24 | 2020-11-06 | 青岛海尔新能源电器有限公司 | Control method and control device of heat pump water heater |
| WO2022127309A1 (en) * | 2020-12-17 | 2022-06-23 | 珠海格力电器股份有限公司 | Defrosting control method and device, and vrf air conditioner |
| CN113932473A (en) * | 2021-11-24 | 2022-01-14 | 宁波奥克斯电气股份有限公司 | Multi-machine parallel low-temperature heat pump defrosting device, defrosting method and air conditioner |
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Application publication date: 20090617 |