CN104422064A - Air conditioning defrosting control method and device - Google Patents
Air conditioning defrosting control method and device Download PDFInfo
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- CN104422064A CN104422064A CN201310369937.1A CN201310369937A CN104422064A CN 104422064 A CN104422064 A CN 104422064A CN 201310369937 A CN201310369937 A CN 201310369937A CN 104422064 A CN104422064 A CN 104422064A
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- defrost
- preset time
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/40—Pressure, e.g. wind pressure
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- Combustion & Propulsion (AREA)
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- Atmospheric Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioning defrosting control method and device. The air conditioning defrosting control method comprises obtaining the differential pressure of the front portion and the rear portion of an outdoor heat exchanger of an air conditioning to serve as an original differential pressure P0 after a first preset time is started through a compressor; timely obtaining the differential pressure of the front portion and the rear portion of the outdoor heat exchanger to serve as a current differential pressure P1 after a second preset time is started through the compressor and obtaining the difference delta P between the current differential pressure and the original differential pressure through calculation, wherein the formula as follows; controlling the air conditioning to enter the defrosting mode when the delta P is not less than a first preset threshold value and the time duration is equal to a third preset time. According to the air conditioning defrosting control method and device, pressure sensors are arranged on the front portion and the rear portion of the outdoor heat exchanger of the air conditioning respectively so as to determine whether the air conditioning needs to enter the defrosting or exit from the defrosting through the differential pressure change of the front portion and the rear portion of the outdoor heat exchanger in the running process of the air conditioning and accordingly the false operation of the outdoor heat exchanger due to the differential pressure change caused by other reasons can be effectively avoided, the defrosting of a system is accurately determined, and the energy waste is reduced.
Description
Technical field
The present invention relates to air-conditioner field, particularly relate to a kind of defrosting control method and device of air-conditioner.
Background technology
Heat pump air conditioner when heating operation in, cold-producing medium is by outdoor heat exchanger and outdoor air generation heat exchange, absorption of air heat and evaporating outdoor, the refrigerant compression of low-temp low-pressure is become the refrigerant vapour of HTHP by compressor, enters indoor heat converter heat release; Release heat by indoor heat converter and carry out heating indoor air, make people enjoy pleasant environment.
Owing to absorbing heat in outdoor heat converter outdoor air, outdoor heat converter environment temperature is lower, and the steam in air can condense into frost and be attached to outdoor heat converter surface, have impact on the exchange capability of heat of outdoor heat converter, the heating capacity of device declines, and affects the comfortableness of people.
In order to solve air-conditioner defrosting problem, according to the variations in temperature on the outdoor heat exchanger coil pipe that this temperature sensor detects, current air-conditioner, by set temperature sensor on outdoor heat exchanger, determines whether that needs enter defrosting; When variations in temperature meets defrosting entry condition, system carries out defrosting action, and when reaching defrosting exit criteria, system exits defrosting, enters and normally heats.When residing for outdoor heat exchanger during variation of ambient temperature, likely there is frostless defrost situation or produce very thick frost layer and do not enter defrost in this decision method, thus energy dissipation or defrost overlong time user may be caused to feel uncomfortable problem.
Summary of the invention
The main purpose of the embodiment of the present invention is to provide a kind of defrosting control method and device of air-conditioner, is intended to the frosting situation judging air-conditioner exactly, decreases energy dissipation.
For reaching above object, embodiments providing a kind of defrosting control method of air-conditioner, comprising the following steps:
After compressor start one first preset time, obtain the pressure reduction before and after air conditioner chamber's external heat exchanger, as original pressure reduction P0;
After compressor start one second preset time, the pressure reduction before and after Real-time Obtaining outdoor heat exchanger, as current differential pressure P1, and calculates the poor △ P=P1-P0 obtained between current differential pressure and original pressure reduction; Wherein the second preset time is greater than the first preset time;
When △ P is more than or equal to the first predetermined threshold value, and when the duration is the 3rd preset time, control air-conditioner and enter defrost pattern.
Preferably, described after compressor start one first preset time, obtain the pressure reduction before and after air conditioner chamber's external heat exchanger, comprise as original pressure reduction P0:
After compressor start one first preset time and before compressor start the 4th preset time, the pressure reduction before and after Real-time Obtaining air conditioner chamber external heat exchanger, wherein the 4th preset time is greater than the first preset time, and the 4th preset time is less than the second preset time;
Using pressure reduction minimum in the pressure reduction before and after all air conditioner chamber's external heat exchangers of acquisition as original pressure reduction P0.
Preferably, described first preset time is 3 ~ 5 minutes, and the second preset time is 20 ~ 30 minutes, and the 3rd preset time is 2 ~ 5 minutes, and the 4th preset time is 8 ~ 10 minutes, and the first predetermined threshold value is 10Pa ~ 13Pa.
Preferably, described control air-conditioner also comprises after entering defrost pattern:
Judge whether the operational factor of air-conditioner meets and arbitraryly exit defrost condition, if meet, then exit defrost; If do not meet, then continue defrost;
Exit defrost condition to comprise:
A) to enter after defrost the pressure reduction P2 before and after sensing chamber's external heat exchanger in real time, when the value of P2-P0 is less than or equal to the second predetermined threshold value, then exit defrost;
B) enter the temperature T3 of sensing chamber's external heat exchanger in real time after defrost, when T3 is more than or equal to the first preset temperature, then exit defrost;
C) enter the temperature T3 of sensing chamber's external heat exchanger in real time after defrost, when T3 >=the second preset temperature and the duration reaches the 5th preset time time, then exit defrost;
D) record the defrost time after entering defrost, when this defrost time is more than or equal to the 6th preset time, then exit defrost.
Preferably, described second predetermined threshold value is 1Pa ~ 4Pa, and the first preset temperature is 10 DEG C ~ 13 DEG C, and the second preset temperature is 5 DEG C ~ 9 DEG C, and the 5th preset time is 60s ~ 150s, and the 6th preset time is 10 minutes ~ 15 minutes.
The embodiment of the present invention additionally provides a kind of defrosting control device of air-conditioner, comprising:
Original pressure reduction acquisition module, for after compressor start one first preset time, obtains the pressure reduction before and after air conditioner chamber's external heat exchanger, as original pressure reduction P0;
Pressure reduction change acquisition module, for after compressor start one second preset time, the pressure reduction before and after Real-time Obtaining outdoor heat exchanger, as current differential pressure P1, and calculates the poor △ P=P1-P0 obtained between current differential pressure and original pressure reduction; Wherein the second preset time is greater than the first preset time;
Defrost enters control module, for being more than or equal to the first predetermined threshold value as △ P, and when the duration is the 3rd preset time, controlling air-conditioner and entering defrost pattern.
Preferably, described original pressure reduction acquisition module comprises:
Pressure reduction acquiring unit, for after compressor start one first preset time and before compressor start the 4th preset time, the pressure reduction before and after Real-time Obtaining air conditioner chamber external heat exchanger, wherein the 3rd preset time is greater than the first preset time;
Computing unit, for pressure reduction minimum in the pressure reduction before and after all air conditioner chamber's external heat exchangers of pressure reduction acquiring unit being obtained as original pressure reduction P0.
Preferably, described first preset time is 3 ~ 5 minutes, and the second preset time is 20 ~ 30 minutes, and the 3rd preset time is 2 ~ 5 minutes, and the 4th preset time is 8 ~ 10 minutes, and the first predetermined threshold value is 10Pa ~ 13Pa.
Preferably, the defrosting control device of described air-conditioner also comprises defrost and exits control module, arbitraryly exiting defrost condition below, if meet, then exiting defrost for judging that whether the operational factor of air-conditioner meets; If do not meet, then continue defrost;
The described defrost condition that exits comprises:
A) to enter after defrost the pressure reduction P2 before and after sensing chamber's external heat exchanger in real time, when the value of P2-P0 is less than or equal to the second predetermined threshold value, then exit defrost;
B) enter the temperature T3 of sensing chamber's external heat exchanger in real time after defrost, when T3 is more than or equal to the first preset temperature, then exit defrost;
C) enter the temperature T3 of sensing chamber's external heat exchanger in real time after defrost, when T3 >=the second preset temperature and the duration reaches the 5th preset time time, then exit defrost;
D) record the defrost time after entering defrost, when this defrost time is more than or equal to the 6th preset time, then exit defrost.
Preferably, described second predetermined threshold value is 1Pa ~ 4Pa, and the first preset temperature is 10 DEG C ~ 13 DEG C, and the second preset temperature is 5 DEG C ~ 9 DEG C, and the 5th preset time is 60s ~ 150s, and the 6th preset time is 10 minutes ~ 15 minutes.
The embodiment of the present invention by arranging pressure sensor before and after air conditioner chamber's external heat exchanger, with in air-conditioner running, judge that air-conditioner is the need of entering defrost or whether can exiting defrost by the pressure reduction change before and after outdoor heat exchanger, thus the misoperation of the pressure reduction change appearance can effectively avoiding outdoor heat exchanger to cause due to other reasons, determined the frosting situation of system accurately, decrease energy dissipation.
Accompanying drawing explanation
Fig. 1 is the structural representation of air-conditioner of the present invention;
Fig. 2 is the schematic flow sheet of defrosting control method first embodiment of air-conditioner of the present invention;
Fig. 3 is the schematic flow sheet obtaining original pressure reduction in the defrosting control method of air-conditioner of the present invention;
Fig. 4 is the schematic flow sheet of defrosting control method second embodiment of air-conditioner of the present invention;
Fig. 5 is the high-level schematic functional block diagram of defrosting control device first embodiment of air-conditioner of the present invention;
Fig. 6 is the high-level schematic functional block diagram of original pressure reduction acquisition module in the defrosting control device of air-conditioner of the present invention;
Fig. 7 is the high-level schematic functional block diagram of defrosting control device second embodiment of air-conditioner of the present invention.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Detailed description of the invention
Technical scheme of the present invention is further illustrated below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Main thought of the present invention is by arranging pressure sensor before and after air conditioner chamber's external heat exchanger, with in air-conditioner running, judge that air-conditioner is the need of entering defrost or whether can exiting defrost by the pressure reduction change before and after outdoor heat exchanger, thus the misoperation of the pressure reduction change appearance can effectively avoiding outdoor heat exchanger to cause due to other reasons, determined the frosting situation of system accurately, decrease energy dissipation.
With reference to Fig. 1, air-conditioner preferred embodiment of the present invention is proposed.This air-conditioner comprises cross valve 1, indoor fan 2, indoor heat exchanger 3, throttling arrangement 4, outdoor heat converter differential pressure controller 5, outdoor heat converter 6, outdoor heat exchanger pressure sensor 61,62, outdoor heat exchanger temperature sensor 7, outdoor fan 8, compressor body 9, compressor liquid storage device 10.Described differential pressure controller 5 is for obtaining the pressure of pressure sensor 61,62, and the pressure differential both calculating, then according to the change of pressure differential, judge whether enter defrost and exit defrost.Based on the air-conditioner of said structure, describe the defrosting control method of this air-conditioner in detail.
With reference to Fig. 2, defrosting control method first embodiment of a kind of air-conditioner of the present invention is proposed.The defrosting control method of the air-conditioner of this embodiment comprises the following steps:
Step S110, after compressor start one first preset time, obtain the pressure reduction before and after air conditioner chamber external heat exchanger, as original pressure reduction P0;
When compressor start heating operation, start timer, with recording compressed machine start-up time.And when reaching the first preset time this start-up time, then obtain the pressure before and after air conditioner chamber's external heat exchanger, then calculate the pressure differential before and after this outdoor heat exchanger, as original pressure reduction P0.Pressure before and after this air conditioner chamber's external heat exchanger can detect acquisition by the pressure sensor in heat exchanger front and rear surfaces disposed in the outdoor.In the present embodiment, this first preset time is 3 ~ 5 minutes.
Step S120, after compressor start one second preset time, the current differential pressure P1 before and after Real-time Obtaining outdoor heat exchanger, and calculate the poor △ P=P1-P0 obtained between current differential pressure and original pressure reduction;
After calculating the pressure reduction obtained before and after air conditioner chamber's external heat exchanger, then after compressor start one second preset time, by the current differential pressure P1 before and after Real-time Obtaining outdoor heat exchanger, then calculate the difference △ P between this current differential pressure P1 and original pressure reduction P0.This second preset time is greater than the first preset time.This second preset time is 20 ~ 30 minutes.After compressor start second preset time, the normal operation of compressor.
Step S130, be more than or equal to the first predetermined threshold value as △ P, and when the duration is the 3rd preset time, controls air-conditioner and enter defrost pattern.
△ P and the first predetermined threshold value are compared, when △ P is more than or equal to this first predetermined threshold value, record is greater than the duration of this first predetermined threshold value, after this duration reaches the 3rd preset time, then controls air-conditioner and enters defrost pattern.In the present embodiment, this first predetermined threshold value is 10Pa ~ 13Pa, and the 3rd preset time is 2 ~ 5 minutes.
The embodiment of the present invention by arranging pressure sensor before and after air conditioner chamber's external heat exchanger, with in air-conditioner running, judge that air-conditioner is the need of entering defrost or whether can exiting defrost by the pressure reduction change before and after outdoor heat exchanger, thus the misoperation of the pressure reduction change appearance can effectively avoiding outdoor heat exchanger to cause due to other reasons, determined the frosting situation of system accurately, decrease energy dissipation.
Further, above-mentioned original pressure reduction P0 can be that any instant after compressor start one first preset time obtains, and also can calculate acquisition according to the pressure difference obtained in the time period after compressor start one first preset time.For example, referring to Fig. 3, above-mentioned steps S110 comprises:
Step S111, after compressor start one first preset time and before compressor start the 4th preset time, the pressure reduction before and after Real-time Obtaining air conditioner chamber external heat exchanger;
Step S113, using pressure reduction minimum in the pressure reduction before and after all air conditioner chamber's external heat exchangers as original pressure reduction P0.
When after the compressor start time reaches the first preset time and before compressor start the 4th preset time, by the pressure reduction before and after Real-time Obtaining air conditioner chamber external heat exchanger.Then by the pressure reduction before and after all air conditioner chamber external heat exchanger of acquisition within compressor start [the first preset time, the 4th preset time], select minimum pressure reduction as original pressure reduction P0.In the present embodiment, the 4th preset time is 8 ~ 10 minutes.Wherein the 4th preset time is greater than the first preset time, and the 4th preset time is less than the second preset time.In the present embodiment, by choosing the minimum of a value of the pressure reduction in the time period as original pressure reduction P0, making when carrying out the judgement of defrost according to △ P, can more easily meet defrost condition by △ P when needs defrost, and entering defrost in time.
The present embodiment is by obtaining the pressure reduction before and after the outdoor heat exchanger in compressor start one time range, and selection minimum of a value is wherein as original pressure reduction P0, thus can avoid obtaining interference that the pressure reduction that caused by other reasons judges defrost and cause the misoperation of defrost, further ensure the accurate control of defrost.
Be understandable that, above-mentioned first preset time, the second preset time, the 3rd preset time, the 4th preset time all referred to relative to time during compressor start.
Further, with reference to Fig. 4, defrosting control method second embodiment of air-conditioner of the present invention is proposed.In this embodiment, also comprise after above-mentioned steps S130:
Step S140, judge whether the operational factor of air-conditioner meets and arbitraryly exit defrost condition, if meet, then proceed to step S150; If do not meet, then return step S140;
Step S150, exit defrost, and return step S110.
Exit defrost condition to comprise:
Condition one: to enter after defrost the pressure reduction P2 before and after sensing chamber's external heat exchanger in real time, when the value of P2-P0 is less than or equal to the second predetermined threshold value, then exit defrost.By the pressure sensor before and after heat exchanger disposed in the outdoor, with the pressure before and after real-time sensing chamber external heat exchanger.Then calculate the current differential pressure P2 obtained before and after outdoor heat exchanger, and then calculate the difference △ P=P2-P0 obtained between current differential pressure P2 and original pressure reduction P0.Judge whether this △ P is less than or equal to the second predetermined threshold value, is exit defrost, otherwise continue defrost.In the embodiment of the present invention, the second predetermined threshold value is 1Pa ~ 4Pa.
Condition two: the temperature T3 entering sensing chamber's external heat exchanger in real time after defrost, when T3 is more than or equal to the first preset temperature, then exits defrost.By the temperature sensor on heat exchanger disposed in the outdoor, with the temperature T3 of real-time sensing chamber external heat exchanger.Then judge whether this temperature T3 is more than or equal to the first preset temperature, when this temperature T3 is more than or equal to the first preset temperature, then exit defrost, otherwise continue defrost.In the embodiment of the present invention, the first preset temperature is 10 DEG C ~ 13 DEG C.
Condition three: the temperature T3 entering sensing chamber's external heat exchanger in real time after defrost, when T3 >=the second preset temperature and the duration reaches the 5th preset time time, then exit defrost.By the temperature sensor on heat exchanger disposed in the outdoor, with the temperature T3 of real-time sensing chamber external heat exchanger.Then judging whether this temperature T3 is more than or equal to the second preset temperature, when being more than or equal to the first preset temperature and the duration reaches the 5th preset time, then exiting defrost, otherwise continue defrost.In the embodiment of the present invention, the second preset temperature is 5 DEG C ~ 9 DEG C, and the 5th preset time is 60s ~ 150s.
Condition four: record the defrost time after entering defrost, when this defrost time is more than or equal to the 6th preset time, then exits defrost.When entering defrost, then start timer, the time of record defrost.When the time of this defrost is more than or equal to the 6th preset time, then exit defrost, otherwise continue defrost.In the embodiment of the present invention, the 6th preset time is 10 minutes ~ 15 minutes.
Be understandable that, above-mentioned four conditions not the dividing of order, and the condition that defrost is exited in this judgement can select wherein one or more conditions according to situation particularly.When a condition does not meet, can also judge whether other condition meets.
Whether the embodiment of the present invention, after air-conditioner enters defrost, exits defrost according to exiting defrost condition judgment, thus can judge frostless situation exactly, further ensure the accurate control of defrost, decrease energy dissipation.
To the defrosting control process of air-conditioner be specifically described below:
Embodiment one:
1) compressor start starts heating operation, starts the start-up time calculating compressor;
2) start to record P0 when detecting compressor start 3 minutes, P0 i.e. 3rd ~ 8 minutes pressure reduction minimum of a values, such as P0=10Pa;
3) when air-conditioner set reaches 25 minutes running times of regulation running time, start to detect P1, P1 is the instantaneous value of pressure differential before and after outdoor heat exchanger after the 25th minute;
4) when △ P=P1-P0 >=10Pa also continues 2 minutes, when namely P1 >=20Pa also continues 2 minutes, defrost is entered;
5) detect P2 immediately after entering defrost, P2 is the instantaneous value entering pressure differential before and after outdoor heat exchanger after defrost, if P2≤11Pa, meets defrost exit criteria, exits defrost and recovers normally to heat;
6) start normally to heat latter 3rd ~ 8 minutes record P0, so constantly carry out defrost circulation.
Embodiment two:
1) compressor start starts heating operation, starts the start-up time calculating compressor;
2) start to record P0 when detecting compressor start 3 minutes, P0 i.e. 3rd ~ 8 minutes pressure reduction minimum of a values, such as P0=10Pa;
3) when air-conditioner set reaches 25 minutes running times of regulation running time, start to detect P1, P1 is the instantaneous value of pressure differential before and after outdoor heat exchanger after the 25th minute;
4) when △ P=P1-P0 >=10Pa also continues 2 minutes, when namely P1 >=20Pa also continues 2 minutes, defrost is entered;
5) detect T3 immediately after entering defrost, T3 is the temperature that after entering defrost, outdoor heat exchange organ pipe temperature sensor detects.When T3 >=11 DEG C or when T3 >=8 DEG C and duration 80s or when the defrost duration is more than 15min, meet defrost exit criteria, exit defrost and recover normally to heat;
6) start normally to heat latter 3rd ~ 8 minutes record P0, so constantly carry out defrost circulation.
With reference to Fig. 5, defrosting control device first embodiment of a kind of air-conditioner of the present invention is proposed.The defrosting control device of the air-conditioner of this embodiment comprises:
Original pressure reduction acquisition module 110, for after compressor start one first preset time, obtains the pressure reduction before and after air conditioner chamber's external heat exchanger, as original pressure reduction P0;
Pressure reduction change acquisition module 120, for after compressor start second preset time, the pressure reduction before and after Real-time Obtaining outdoor heat exchanger, as current differential pressure P1, and calculates the poor △ P=P1-P0 obtained between current differential pressure and original pressure reduction; Wherein the second preset time is greater than the first preset time;
Defrost enters control module 130, for being more than or equal to the first predetermined threshold value as △ P, and when the duration is the 3rd preset time, controlling air-conditioner and entering defrost pattern.
When compressor start heating operation, start timer, with recording compressed machine start-up time.And after reaching the first preset time this start-up time, original pressure reduction acquisition module 110 obtains the pressure before and after air conditioner chamber's external heat exchanger, then calculates the pressure differential before and after this outdoor heat exchanger, as original pressure reduction P0.Pressure before and after this air conditioner chamber's external heat exchanger can detect acquisition by the pressure sensor in heat exchanger front and rear surfaces disposed in the outdoor.In the present embodiment, this first preset time is 3 ~ 5 minutes.After calculating the pressure reduction obtained before and after air conditioner chamber's external heat exchanger, pressure reduction change acquisition module 120 will after compressor start second preset time, current differential pressure P1 before and after Real-time Obtaining outdoor heat exchanger, then calculates the difference △ P between this current differential pressure P1 and original pressure reduction P0.This second preset time is 20 ~ 30 minutes.△ P and the first predetermined threshold value are compared, when △ P is more than or equal to this first predetermined threshold value, record is greater than the duration of this first predetermined threshold value, and after this duration reaches the 3rd preset time, defrost enters control module 130 control air-conditioner and enters defrost pattern.In the present embodiment, this first predetermined threshold value is 10Pa ~ 13Pa, and the 3rd preset time is 2 ~ 5 minutes.
The embodiment of the present invention by arranging pressure sensor before and after air conditioner chamber's external heat exchanger, with in air-conditioner running, judge that air-conditioner is the need of entering defrost or whether can exiting defrost by the pressure reduction change before and after outdoor heat exchanger, thus the misoperation of the pressure reduction change appearance can effectively avoiding outdoor heat exchanger to cause due to other reasons, determined the frosting situation of system accurately, decrease energy dissipation.
Further, with reference to Fig. 6, above-mentioned original pressure reduction acquisition module 110 comprises:
Pressure reduction acquiring unit 111, for after compressor start one first preset time and before compressor start the 4th preset time, pressure reduction before and after Real-time Obtaining air conditioner chamber external heat exchanger, wherein the 4th preset time is greater than the first preset time, and the 4th preset time is less than the second preset time;
Computing unit 113, for pressure reduction minimum in the pressure reduction before and after all air conditioner chamber's external heat exchangers of pressure reduction acquiring unit 111 being obtained as original pressure reduction P0.
When the compressor start time reaches the first preset time, pressure reduction acquiring unit 111 starts to obtain the pressure reduction before and after air conditioner chamber's external heat exchanger.And before the compressor start time reaches the 4th preset time, by the pressure reduction before and after Real-time Obtaining air conditioner chamber external heat exchanger.Then computing unit 113 is by the pressure reduction before and after all air conditioner chamber external heat exchanger of acquisition within compressor start [the first preset time, the 4th preset time], selects minimum pressure reduction as original pressure reduction P0.In the present embodiment, the 3rd preset time is 8 ~ 10 minutes.
The present embodiment is by obtaining the pressure reduction before and after the outdoor heat exchanger in compressor start one time range, and selection minimum of a value is wherein as original pressure reduction P0, thus can avoid obtaining interference that the pressure reduction that caused by other reasons judges defrost and cause the misoperation of defrost, further ensure the accurate control of defrost.
Further, with reference to Fig. 7, defrosting control device second embodiment of air-conditioner of the present invention is proposed.In this embodiment, the defrosting control device of above-mentioned air-conditioner also comprises defrost and exits control module 140, arbitraryly exiting defrost condition below, if meet, then exiting defrost for judging that whether the operational factor of air-conditioner meets; If do not meet, then continue defrost.
Condition one: to enter after defrost the pressure reduction P2 before and after sensing chamber's external heat exchanger in real time, when the value of P2-P0 is less than or equal to the second predetermined threshold value, then exit defrost.By the pressure sensor before and after heat exchanger disposed in the outdoor, with the pressure before and after real-time sensing chamber external heat exchanger.Then calculate the current differential pressure P2 obtained before and after outdoor heat exchanger, and then calculate the difference △ P=P2-P0 obtained between current differential pressure P2 and original pressure reduction P0.Judge whether this △ P is less than or equal to the second predetermined threshold value, is exit defrost, otherwise continue defrost.In the embodiment of the present invention, the second predetermined threshold value is 1Pa ~ 4Pa.
Condition two: the temperature T3 entering sensing chamber's external heat exchanger in real time after defrost, when T3 is more than or equal to the first preset temperature, then exits defrost.By the temperature sensor on heat exchanger disposed in the outdoor, with the temperature T3 of real-time sensing chamber external heat exchanger.Then judge whether this temperature T3 is more than or equal to the first preset temperature, when this temperature T3 is more than or equal to the first preset temperature, then exit defrost, otherwise continue defrost.In the embodiment of the present invention, the first preset temperature is 10 DEG C ~ 13 DEG C.
Condition three: the temperature T3 entering sensing chamber's external heat exchanger in real time after defrost, when T3 >=the second preset temperature and the duration reaches the 5th preset time time, then exit defrost.By the temperature sensor on heat exchanger disposed in the outdoor, with the temperature T3 of real-time sensing chamber external heat exchanger.Then judging whether this temperature T3 is more than or equal to the second preset temperature, when being more than or equal to the first preset temperature and the duration reaches the 5th preset time, then exiting defrost, otherwise continue defrost.In the embodiment of the present invention, the second preset temperature is 5 DEG C ~ 9 DEG C, and the 4th preset time is 60s ~ 150s.
Condition four: record the defrost time after entering defrost, when this defrost time is more than or equal to the 6th preset time, then exits defrost.When entering defrost, then start timer, the time of record defrost.When the time of this defrost is more than or equal to the 6th preset time, then exit defrost, otherwise continue defrost.In the embodiment of the present invention, the 6th preset time is 10 minutes ~ 15 minutes.
Be understandable that, above-mentioned four conditions not the dividing of order, and the condition that defrost is exited in this judgement can select wherein one or more conditions according to situation particularly.When a condition does not meet, can also judge whether other condition meets.
Whether the embodiment of the present invention, after air-conditioner enters defrost, exits defrost according to exiting defrost condition judgment, thus can judge frostless situation exactly, further ensure the accurate control of defrost, decrease energy dissipation.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that above-described embodiment method can add required general hardware platform by software and realize, hardware can certainly be passed through, but in a lot of situation, the former is better embodiment.Based on such understanding, technical scheme of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product is stored in a storage medium (as ROM/RAM, magnetic disc, CD), comprising some instructions in order to make a station terminal equipment (can be mobile phone, computer, server, or the network equipment etc.) perform method described in each embodiment of the present invention.
The foregoing is only the preferred embodiments of the present invention; not thereby its scope of the claims is limited; every utilize description of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; directly or indirectly be used in the technical field that other are relevant, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a defrosting control method for air-conditioner, is characterized in that, comprises the following steps:
After compressor start one first preset time, obtain the pressure reduction before and after air conditioner chamber's external heat exchanger, as original pressure reduction P0;
After compressor start one second preset time, the pressure reduction before and after Real-time Obtaining outdoor heat exchanger, as current differential pressure P1, and calculates the poor △ P=P1-P0 obtained between current differential pressure and original pressure reduction; Wherein the second preset time is greater than the first preset time;
When △ P is more than or equal to the first predetermined threshold value, and when the duration is the 3rd preset time, control air-conditioner and enter defrost pattern.
2. the defrosting control method of air-conditioner according to claim 1, is characterized in that, described after compressor start one first preset time, obtains the pressure reduction before and after air conditioner chamber's external heat exchanger, comprises as original pressure reduction P0:
After compressor start one first preset time and before compressor start the 4th preset time, the pressure reduction before and after Real-time Obtaining air conditioner chamber external heat exchanger, wherein the 4th preset time is greater than the first preset time, and the 4th preset time is less than the second preset time;
Using pressure reduction minimum in the pressure reduction before and after all air conditioner chamber's external heat exchangers of acquisition as original pressure reduction P0.
3. the defrosting control method of air-conditioner according to claim 2, is characterized in that, described first preset time is 3 ~ 5 minutes, second preset time is 20 ~ 30 minutes, 3rd preset time is 2 ~ 5 minutes, and the 4th preset time is 8 ~ 10 minutes, and the first predetermined threshold value is 10Pa ~ 13Pa.
4. the defrosting control method of the air-conditioner according to any one of claim 1-3, is characterized in that, described control air-conditioner also comprises after entering defrost pattern:
Judge whether the operational factor of air-conditioner meets and arbitraryly exit defrost condition, if meet, then exit defrost; If do not meet, then continue defrost;
Exit defrost condition to comprise:
A) to enter after defrost the pressure reduction P2 before and after sensing chamber's external heat exchanger in real time, when the value of P2-P0 is less than or equal to the second predetermined threshold value, then exit defrost;
B) enter the temperature T3 of sensing chamber's external heat exchanger in real time after defrost, when T3 is more than or equal to the first preset temperature, then exit defrost;
C) enter the temperature T3 of sensing chamber's external heat exchanger in real time after defrost, when T3 >=the second preset temperature and the duration reaches the 5th preset time time, then exit defrost;
D) record the defrost time after entering defrost, when this defrost time is more than or equal to the 6th preset time, then exit defrost.
5. the defrosting control method of air-conditioner according to claim 4, it is characterized in that, described second predetermined threshold value is 1Pa ~ 4Pa, first preset temperature is 10 DEG C ~ 13 DEG C, second preset temperature is 5 DEG C ~ 9 DEG C, 5th preset time is 60s ~ 150s, and the 6th preset time is 10 minutes ~ 15 minutes.
6. a defrosting control device for air-conditioner, is characterized in that, comprising:
Original pressure reduction acquisition module, for after compressor start one first preset time, obtains the pressure reduction before and after air conditioner chamber's external heat exchanger, as original pressure reduction P0;
Pressure reduction change acquisition module, for after compressor start one second preset time, the pressure reduction before and after Real-time Obtaining outdoor heat exchanger, as current differential pressure P1, and calculates the poor △ P=P1-P0 obtained between current differential pressure and original pressure reduction; Wherein the second preset time is greater than the first preset time;
Defrost enters control module, for being more than or equal to the first predetermined threshold value as △ P, and when the duration is the 3rd preset time, controlling air-conditioner and entering defrost pattern.
7. the defrosting control device of air-conditioner according to claim 1, is characterized in that, described original pressure reduction acquisition module comprises:
Pressure reduction acquiring unit, for after compressor start one first preset time and before compressor start the 4th preset time, pressure reduction before and after Real-time Obtaining air conditioner chamber external heat exchanger, wherein the 4th preset time is greater than the first preset time, and the 4th preset time is less than the second preset time;
Computing unit, for pressure reduction minimum in the pressure reduction before and after all air conditioner chamber's external heat exchangers of pressure reduction acquiring unit being obtained as original pressure reduction P0.
8. the defrosting control device of air-conditioner according to claim 7, is characterized in that, described first preset time is 3 ~ 5 minutes, second preset time is 20 ~ 30 minutes, 3rd preset time is 2 ~ 5 minutes, and the 4th preset time is 8 ~ 10 minutes, and the first predetermined threshold value is 10Pa ~ 13Pa.
9. the defrosting control device of the air-conditioner according to any one of claim 6-8, is characterized in that, also comprises defrost and exits control module, arbitraryly exiting defrost condition below, if meet, then exiting defrost for judging that whether the operational factor of air-conditioner meets; If do not meet, then continue defrost;
The described defrost condition that exits comprises:
A) to enter after defrost the pressure reduction P2 before and after sensing chamber's external heat exchanger in real time, when the value of P2-P0 is less than or equal to the second predetermined threshold value, then exit defrost;
B) enter the temperature T3 of sensing chamber's external heat exchanger in real time after defrost, when T3 is more than or equal to the first preset temperature, then exit defrost;
C) enter the temperature T3 of sensing chamber's external heat exchanger in real time after defrost, when T3 >=the second preset temperature and the duration reaches the 5th preset time time, then exit defrost;
D) record the defrost time after entering defrost, when this defrost time is more than or equal to the 6th preset time, then exit defrost.
10. the defrosting control device of air-conditioner according to claim 9, it is characterized in that, described second predetermined threshold value is 1Pa ~ 4Pa, first preset temperature is 10 DEG C ~ 13 DEG C, second preset temperature is 5 DEG C ~ 9 DEG C, 5th preset time is 60s ~ 150s, and the 6th preset time is 10 minutes ~ 15 minutes.
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| CN109974203A (en) * | 2019-03-06 | 2019-07-05 | 青岛海信日立空调***有限公司 | A kind of Defrost method and air conditioner of air conditioner |
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| CN110296572B (en) * | 2019-07-03 | 2021-06-04 | 四川电力设计咨询有限责任公司 | Defrosting method and defrosting device applied to outdoor air suction opening of fan in severe cold area |
| CN110296572A (en) * | 2019-07-03 | 2019-10-01 | 四川电力设计咨询有限责任公司 | Defrost method and defroster applied to air inlet outside the fan house of severe cold area |
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