CN104019593A - Defrosting method of air conditioner - Google Patents
Defrosting method of air conditioner Download PDFInfo
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- CN104019593A CN104019593A CN201310065003.9A CN201310065003A CN104019593A CN 104019593 A CN104019593 A CN 104019593A CN 201310065003 A CN201310065003 A CN 201310065003A CN 104019593 A CN104019593 A CN 104019593A
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Abstract
The invention discloses a defrosting method of an air conditioner. The method comprises the steps that S1. a heating mode of a compressor is carried out; S2. the fact that an outdoor fan is shut down at intervals is detected, and whether compressor accumulative operation time t reaches first preset time t1 is detected; S3. when t is larger than or equal to t1, a defrosting stage is carried out; S4. outdoor fan operation is detected, whether t is larger than second preset time t2 is detected, and the difference value delta T (delta T = T2 - T1) of the temperature T2 of an indoor heat exchanger and indoor environment temperature T1 is compared with a preset threshold value new delta T; S5. when t is larger than t2 and is smaller than third preset time t3, whether delta T is smaller than new delta T is judged; S6. when delta T is smaller than new delta T, the defrosting stage is carried out; S7. when t is larger than t3, whether delta T is smaller than new delta T + 2 DET C is judged; S8. if delta T is smaller than new delta T + 2 DET C, the defrosting stage is carried out; and S9. defrosting is over. According to the defrosting method, the operation that existing frost is removed, and when no frost exists, no processes are carried out can be achieved.
Description
Technical field
The present invention relates to living electric apparatus field, especially relate to a kind of Defrost method of air-conditioning.
Background technology
At present air-conditioner defrosting is the control method that adopts outdoor heat exchanger temperature sensor or indoor temperature transmitter and timing defrost combination, above two kinds of defrost modes or cost is higher, or there is the problem of the clean or frostless defrost of frostization, affect heating effect.
Summary of the invention
The present invention is intended at least solve one of technical problem existing in prior art.For this reason, one object of the present invention is to propose a kind of Defrost method of realizing frost defrosting, the frostless air-conditioning exiting.
According to the Defrost method of the air-conditioning of the embodiment of the present invention, described air-conditioning comprises compressor, indoor fan, indoor heat exchanger, outdoor fan and cross valve, comprise the steps: S1: described compressor enters heating mode, and detect t running time of described compressor, detect described outdoor fan simultaneously and whether close; S2: in the time detecting in step S1 that described outdoor fan is intermittently closed, detect and close and when described compressor operating, whether the accumulated running time t of described compressor reaches the first scheduled time t1 when described outdoor fan; S3: in the time detecting that accumulated running time t is more than or equal to the first scheduled time t1, described air-conditioning enters into the defrost stage, in the time detecting that accumulated running time t is less than the first scheduled time t1, gets back to step S2; S4: in the time described outdoor fan continuous service being detected in step S1, whether t running time that detects described compressor is greater than the second scheduled time t2, and in the process of described compressor operating by the temperature T of the described indoor heat exchanger detecting 2 difference △ T=T2-T1 and the predetermined threshold △ T with indoor environment temperature T1
newlycompare; S5: in the time detecting in step S4 that t running time of described compressor is greater than the second scheduled time t2 and is less than the 3rd scheduled time t3, whether the △ T that judgement detects is less than predetermined threshold △ T
newly; S6: in the time of being judged as YES in step S5, described air-conditioning enters the defrost stage, in the time of being judged as NO of step S5, continuing the △ T that judgement detects and whether is less than △ T
newly; S7: in the time detecting in step S4 that t running time of described compressor is greater than the 3rd scheduled time t3, whether the △ T that judgement detects is less than △ T
newly+ 2 DEG C; S8: in the time of being judged as YES in step S7, described air-conditioning enters the defrost stage, in the time of being judged as NO in step S7, continuing the △ T that judgement detects and whether is less than △ T
newly+ 2 DEG C; S9: in the described defrost stage, when described operation of air conditioner defrost time D T
alwaysor when defrost end signal detected, defrost finishes, and gets back to step S1, so circulation.
According to the Defrost method of the air-conditioning of the embodiment of the present invention, the parameter control air-conditioning such as t running time by indoor environment temperature T1, indoor heat exchanger temperature T 2 and compressor enters the defrost stage and exits the defrost stage, there are frost defrosting, the frostless object exiting thereby realize, improved the heating effect of air-conditioning.
In addition, also there is following additional technical feature according to the Defrost method of air-conditioning of the present invention:
In some embodiments of the invention, step S4 also comprises: S41: in the process of described compressor operating, when the difference △ T detecting is less than △ T
newlytime, whether t running time that detects described compressor is greater than described the second scheduled time t2; S42: in the time of t<t2, continue to detect in the time that the running time of described compressor, t equaled described the second scheduled time t2, whether difference △ T is still less than △ T
newly; S43: in the time of being judged as YES in step S42, set defrost time D T
alwaysbe the 4th scheduled time t4.Thereby can ensure the defrosting effect of air-conditioning.
Particularly, described the 4th scheduled time t4 is ten minutes.
According to some embodiments of the present invention, the △ T in step S4-S8
newlyby △ T
wind speed, indoor environment temperature T1 and defrost temperature difference correction factor △ T2 compute draw: 1) calculate △ T2:a) in the time of T1>=18 DEG C, Δ T2=0; B) in the time of 18 DEG C of 0≤T1 <, Δ T2=(20-T1)/8, directly adopting the shift division of single-chip microcomputer, result only has integer part; C) in the time of T1 < 0, Δ T2=2; 2) calculate
△ T
newly: △ T
newly=△ T
wind speed-Δ T2; Wherein △ T
wind speedfor the defrost parameter value of setting according to the wind speed of described indoor fan.Thereby can further ensure that air-conditioning can realize frost defrosting, the frostless object exiting.
Further, the Defrost method of described air-conditioning also comprises the steps: S10: in the time described compressor operating being detected to described the second scheduled time t2 in step S4, whether the wind speed that detects described indoor fan is gentle breeze; S11: in the time detecting that described wind speed is gentle breeze, enter into the defrost stage, when detecting that described wind speed is not during for gentle breeze, whether t running time that detects described compressor is greater than described the 3rd scheduled time t3; S12: in the time detecting that t running time of described compressor is greater than the second scheduled time t2 and is less than the 3rd scheduled time t3, and the △ T that judgement detects is less than predetermined threshold △ T
newlytime, described air-conditioning enters the defrost stage; In the time detecting that t running time of described compressor is greater than the 3rd scheduled time t3, and the △ T that judgement detects is less than △ T
newly+ 2 DEG C time, described air-conditioning enters the defrost stage.
Particularly, described defrost end signal is that current continuity the 5th scheduled time t5 that described compressor detected meets or exceeds defrost and exits current parameters.
Preferably, described the 5th scheduled time t5 is 7 seconds.
According to some embodiments of the present invention, at described defrost time D T
alwaysin, described compressor the 6th scheduled time △ t1 first out of service, then described compressor starts operation; First described outdoor fan and described cross valve move the 7th scheduled time △ t3, and then described outdoor fan and described cross valve are out of service; First described indoor fan moves the 8th scheduled time △ t2, and then described indoor fan is out of service.Thereby can ensure defrosting effect and the heating effect of air-conditioning.
Further, in step S9, described air-conditioning has the defrost tenth skill of the 9th scheduled time △ t4 after defrost finishes, in described the 9th scheduled time △ t4, described compressor and described indoor fan are out of service, after described cross valve the tenth scheduled time △ t5 out of service, bring into operation, described outdoor fan operation.Thereby can ensure defrosting effect and the heating effect of air-conditioning.
Additional aspect of the present invention and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Brief description of the drawings
Above-mentioned and/or additional aspect of the present invention and advantage accompanying drawing below combination is understood becoming the description of embodiment obviously and easily, wherein:
Fig. 1 is according to the flow chart of the Defrost method of the air-conditioning of the embodiment of the present invention;
Fig. 2 is the flow chart of the Defrost method of air-conditioning according to an embodiment of the invention;
Fig. 3 is the running status schematic diagram during defrost stage and defrost tenth skill according to the compressor of the embodiment of the present invention, cross valve, outdoor fan and indoor fan;
Fig. 4 is compressor, cross valve, outdoor fan and the indoor fan running status schematic diagram during defrost stage and defrost tenth skill according to an embodiment of the invention.
Detailed description of the invention
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Be exemplary below by the embodiment being described with reference to the drawings, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
In description of the invention, it will be appreciated that, term " " center ", " longitudinally ", " laterally ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", orientation or the position relationship of instructions such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of device or the element of instruction or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second " be only for describing object, and can not be interpreted as instruction or hint relative importance.
In description of the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; Can be mechanical connection, can be also electrical connection; Can be to be directly connected, also can indirectly be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can concrete condition understand above-mentioned term concrete meaning in the present invention.
Describe according to the Defrost method of a kind of air-conditioning of the embodiment of the present invention below with reference to Fig. 1-Fig. 4, this air-conditioning comprises compressor, indoor fan, indoor heat exchanger, outdoor fan and cross valve, wherein structure and the operation principle etc. of air-conditioning, by those skilled in the art is known, are not just described in detail here.
According to the Defrost method of the air-conditioning of the embodiment of the present invention, comprise the steps:
Whether S1: compressor enters heating mode, and t running time of detection compressor, detect outdoor fan simultaneously and close.
S2: in the time detecting in step S1 that outdoor fan is intermittently closed, exogenous wind office of sensing chamber closes and when compressor operating, whether the accumulated running time t of compressor reaches the first scheduled time t1.
S3: in the time detecting that accumulated running time t is more than or equal to the first scheduled time t1, air-conditioning enters into the defrost stage, in the time detecting that accumulated running time t is less than the first scheduled time t1, gets back to step S2.
S4: in the time outdoor fan continuous service being detected in step S1, whether t running time that detects compressor is greater than the second scheduled time t2, and in the process of compressor operating by the temperature T of the indoor heat exchanger detecting 2 difference △ T=T2-T1 and the predetermined threshold △ T with indoor environment temperature T1
newlycompare.
S5: in the time detecting in step S4 that t running time of compressor is greater than the second scheduled time t2 and is less than the 3rd scheduled time t3, whether the △ T that judgement detects is less than predetermined threshold △ T
newly.
S6: in the time of being judged as YES in step S5, air-conditioning enters the defrost stage, in the time of being judged as NO of step S5, continuing the △ T that judgement detects and whether is less than △ T
newly.
S7: in the time detecting in step S4 that t running time of compressor is greater than the 3rd scheduled time t3, whether the △ T that judgement detects is less than △ T
newly+ 2 DEG C.
S8: in the time of being judged as YES in step S7, air-conditioning enters the defrost stage, in the time of being judged as NO in step S7, continuing the △ T that judgement detects and whether is less than △ T
newly+ 2 DEG C.
S9: in the defrost stage, when operation of air conditioner defrost time D T
alwaysor when defrost end signal detected, defrost finishes, and gets back to step S1, so circulation.Particularly, defrost end signal is that current continuity the 5th scheduled time t5 that compressor detected meets or exceeds defrost and exits current parameters, wherein sets different defrosts according to different refrigeration systems and exits current parameters.Further, the 5th scheduled time t5 is 7 seconds.
Wherein, the first scheduled time t1, the second scheduled time t2 and the 3rd scheduled time t3 can set according to the performance of compressor and practical operation situation, predetermined threshold △ T
newlydifferent wind speed and indoor environment temperature T1 by indoor fan calculate, defrost time D T
alwayscan calculate according to defrost time parameter DT1, wherein formulate different defrost time parameter DT1 according to different refrigeration systems.
Particularly, first compressor enters heating mode, be that compressor starts moves to manufacture heat, in the process of compressor operating, detect t running time of compressor, whether detect outdoor fan closes simultaneously, now be divided into two kinds of situations: the first situation is to detect that outdoor fan intermittently closes, outdoor fan can be closed because of indoor heat exchanger high temperature protection, now detect the accumulated running time t of compressor in the time that outdoor fan is closed and whether reach the first scheduled time t1, particularly, if air-conditioning does not have defrost action before, t running time of accumulative total compressor while beginning from the high temperature protection of indoor heat exchanger, if air-conditioning carried out defrost action before, t running time of accumulative total compressor while end from the last defrost.In the time detecting that the accumulated running time t of compressor reaches the first scheduled time t1, air-conditioning enters into the defrost stage.When detecting that the accumulated running time t of compressor is less than the first scheduled time t1, continue to detect until the accumulated running time t of compressor stops detecting after reaching the first scheduled time t1, air-conditioning enters into the defrost stage.
The second situation is, detect that outdoor fan is in continuously running duty, whether t running time that now detects compressor is greater than the second scheduled time t2, in the process of compressor operating, detect the temperature T 2 of indoor heat exchanger and detect indoor environment temperature T1 simultaneously, and by difference △ T=T2-T1 and the predetermined threshold △ T of the temperature T of indoor heat exchanger 2 and indoor environment temperature T1
newlycompare, now can be divided into again two kinds of subcases.
The first subcase is t running time that compressor detected when being greater than the second scheduled time t2 and being less than the 3rd scheduled time t3, and whether the △ T that judgement detects is less than predetermined threshold △ T
newly, when △ T is less than predetermined threshold △ T
newlytime, air-conditioning enters into the defrost stage, when △ T is greater than predetermined threshold △ T
newlytime, continue to detect until △ T is less than predetermined threshold △ T
newlyin time, stops detecting, and air-conditioning enters into the defrost stage.
The second subcase is t running time that compressor detected while being greater than the 3rd scheduled time t3, and whether the △ T that judgement detects is less than △ T
newly+ 2 DEG C, when the △ T detecting is less than △ T
newly+ 2 DEG C time, air-conditioning enters into the defrost stage, when the △ T detecting is greater than △ T
newly+ 2 DEG C time, continue to detect until △ T is less than △ T
newly+ 2 DEG C time, stop detecting, now air-conditioning enters into the defrost stage.
In the time that air-conditioning is in the defrost stage, when operation of air conditioner defrost time D T
alwaysor when defrost end signal detected, defrost finishes, whether now air-conditioning detects t running time of compressor again, and detect outdoor fan and close.
According to the Defrost method of the air-conditioning of the embodiment of the present invention, the parameter control air-conditioning such as t running time by indoor environment temperature T1, indoor heat exchanger temperature T 2 and compressor enters the defrost stage and exits the defrost stage, there are frost defrosting, the frostless object exiting thereby realize, improved the heating effect of air-conditioning.
Further, step S4 also comprises:
S41: in the process of compressor operating, when the difference △ T detecting is less than △ T
newlytime, whether t running time that detects compressor is greater than the second scheduled time t2.
S42: in the time of t<t2, continue to detect in the time that the running time of compressor, t equaled the second scheduled time t2, whether difference △ T is still less than △ T
newly.
S43: in the time of being judged as YES in step S42, set defrost time D T
alwaysbe the 4th scheduled time t4.Particularly, the 4th scheduled time t4 is ten minutes.
In other words,, in the process of compressor operating, in the time that compressor operating time t does not reach the second scheduled time t2, detected that difference △ T is less than △ T
newly, and in the time that compressor operating time t is the second scheduled time t2, difference △ T is still less than △ T
newly, now think that air-conditioning frosting is serious, the defrost time D T of air-conditioning
alwaysbe forced to 10 minutes to ensure the defrost effect of air-conditioning.
In some embodiments of the invention, the △ T in step S4-S8
newlyby △ T
wind speed, indoor environment temperature T1 and defrost temperature difference correction factor △ T2 compute draw:
1) calculate △ T2:
A) in the time of T1 >=18 DEG C, Δ T2=0.
B) in the time of 18 DEG C of 0≤T1 <, Δ T2=(20-T1)/8, the shift division of single-chip microcomputer directly adopted, result only has integer part, wherein, the shift division of single-chip microcomputer by those skilled in the art is known, is not just described in detail here.
C) in the time of T1 < 0, Δ T2=2.
2) calculate △ T
newly:
△ T
newly=△ T
wind speed-Δ T2, wherein △ T
wind speedfor the defrost parameter value of setting according to the wind speed of indoor fan.
Particularly, △ T
newlybe that different indoor air velocities has different values with respect to the different wind speed of indoor fan, indoor air velocity corresponding △ T while being powerful wind, Gao Feng, apoplexy, low wind
newlybe respectively △ T
new strong, △ T
new peak, △ T
in new, △ T
new low point.Meanwhile, corresponding △ T when indoor air velocity is powerful wind, Gao Feng, apoplexy, low wind
wind speedbe respectively △ T
by force, △ T
high, △ T
in, △ T
low, now △ T
new strong=△ T
by force-Δ T2, △ T
new peak=△ T
high-Δ T2, △ T
in new=△ T
in-Δ T2, △ T
new low point=△ T
low-Δ T2.Thereby by adopting the defrost parameter value △ T setting according to different wind speed
wind speedcalculate △ T with indoor environment temperature T1
newlymode, can further ensure that air-conditioning can realize frost defrosting, the frostless object exiting.
Particularly, defrost time D T
alwaysaccording to the form below calculates:
Wherein, time ta, tb, tc, td, te are for specifically to set according to actual conditions, and DT1 is defrost time parameter, set different defrost time parameter DT1 according to different refrigeration systems.Further, when air-conditioning enters into the defrost stage according to a kind of situation in situation 1-5, the time D T of the 4th defrost continuous three times
alwaysbe set as DT1+5 minute.
Further, the Defrost method of air-conditioning also comprises the steps:
S10: in the time compressor operating being detected to the second scheduled time t2 in step S4, whether the wind speed of sensing chamber's inner blower is gentle breeze.
S11: in the time detecting that wind speed is gentle breeze, enter into the defrost stage, when detecting that wind speed is not during for gentle breeze, whether t running time that detects described compressor is greater than described the 3rd scheduled time t3.
S12: in the time detecting that t running time of compressor is greater than the second scheduled time t2 and is less than the 3rd scheduled time t3, and the △ T that judgement detects is less than predetermined threshold △ T
newlytime, air-conditioning enters the defrost stage; In the time detecting that t running time of compressor is greater than the 3rd scheduled time t3, and the △ T that judgement detects is less than △ T
newly+ 2 DEG C time, air-conditioning enters into the defrost stage.
Particularly, at defrost time D T
alwaysin, compressor the 6th scheduled time △ t1 first out of service, then compressor starts operation.First outdoor fan and cross valve move the 7th scheduled time △ t3, and then outdoor fan and cross valve are out of service.First indoor fan moves the 8th scheduled time △ t2, and then indoor fan is out of service.Wherein, the 7th scheduled time △ t3 is less than the 6th scheduled time △ t1, and the 8th scheduled time △ t2 is less than the 7th scheduled time △ t3.The 6th scheduled time △ t1, the 7th scheduled time △ t3 and the 8th scheduled time △ t2 can specifically set according to actual conditions.Thereby defrosting effect and the heating effect of air-conditioning are ensured.
Further, in step S9, air-conditioning has the defrost tenth skill of the 9th scheduled time △ t4 after defrost finishes, in the 9th scheduled time △ t4, compressor and indoor fan are out of service, after cross valve the tenth scheduled time △ t5 out of service, bring into operation, and outdoor fan operation.Wherein, the 9th scheduled time △ t4 is greater than the tenth scheduled time △ t5, and the 9th scheduled time △ t4 and the tenth scheduled time △ t5 can specifically set according to actual conditions, to ensure defrosting effect and the heating effect of air-conditioning.
Below with reference to Fig. 2 and Fig. 3, the Defrost method of air-conditioning is according to the preferred embodiment of the invention described.
First, compressor enters heating mode, i.e. whether compressor starts operation in the process of compressor operating, detects t running time of compressor simultaneously, and detect outdoor fan and close because of the high temperature protection of indoor heat exchanger, is now divided into two kinds of situations:
The first situation is, detect that outdoor fan intermittently closes because of the high temperature protection of indoor heat exchanger, whether t running time that detects the situation lower compression machine accumulative total of closing at outdoor inner blower reaches the first scheduled time t1, if there is no defrost action now, t running time of accumulative total compressor while beginning from indoor heat exchanger high temperature protection, if carried out defrost action before, t running time of accumulative total compressor while end from the last defrost, in the time that t running time of compressor accumulative total reaches the first scheduled time t1, air-conditioning enters into the defrost stage, when t running time of compressor accumulative total does not reach the first scheduled time t1, continue to detect until the accumulated running time t of compressor reaches after the first scheduled time t1, air-conditioning enters into the defrost stage.
The second situation is, detect that outdoor fan is in continuously running duty, whether t running time that now detects compressor reaches the second scheduled time t2, and in the running of compressor by the difference △ T=T2-T1 of the temperature T of the indoor heat exchanger detecting 2 and indoor environment temperature T1 and predetermined threshold △ T
newlycompare, wherein predetermined threshold △ T
newlyby △ T
wind speedt1 calculates with indoor environment temperature, and concrete computing formula is as described above, does not just apply and states here.Now can be divided into four kinds of subcases:
The first subcase is that t running time that compressor detected is greater than the second scheduled time t2 and is less than the 3rd scheduled time t3, now by difference △ T and predetermined threshold △ T
newlycompare, when △ T is less than predetermined threshold △ T
newlytime, air-conditioning enters into the defrost stage, when △ T is greater than predetermined threshold △ T
newlytime, continue relatively △ T and △ T
newly, until △ T is less than predetermined threshold △ T
newlytime, stop comparison, now air-conditioning enters into the defrost stage.
The second subcase is that t running time that compressor detected is greater than the 3rd scheduled time t3, and whether the △ T that now judgement detects is less than △ T
newly+ 2 DEG C, when △ T is less than △ T
newly+ 2 DEG C time, air-conditioning enters into the defrost stage, when △ T is greater than △ T
newly+ 2 DEG C, continue △ T and △ T
newly+ 2 DEG C compare, until △ T is less than △ T
newly+ 2 DEG C time, air-conditioning enters into the defrost stage.
In the 3rd, subcase is in the time that t running time that compressor detected reaches the second scheduled time t2, the wind speed that indoor fan detected is gentle breeze, now air-conditioning enters into the defrost stage, in the time detecting that the wind speed of indoor fan is not gentle breeze, whether t running time that detects compressor is greater than described the 3rd scheduled time t3, now air-conditioning can enter into the first subcase or the second subcase, in the time detecting that t running time of compressor is greater than the second scheduled time t2 and is less than the 3rd scheduled time t3, by difference △ T and predetermined threshold △ T
newlycompare, if △ T is less than predetermined threshold △ T
newly, air-conditioning enters into the defrost stage, if △ T is greater than predetermined threshold △ T
newly, continue relatively △ T and △ T
newly, until △ T is less than predetermined threshold △ T
newlytime, stop comparison, now air-conditioning enters into the defrost stage.In the time detecting that t running time of compressor is greater than the 3rd scheduled time t3, whether the △ T that judgement detects is less than △ T
newly+ 2 DEG C, if △ T is less than △ T
newly+ 2 DEG C, air-conditioning enters into the defrost stage, if △ T is greater than △ T
newly+ 2 DEG C, continue △ T and △ T
newly+ 2 DEG C compare, until △ T is less than △ T
newly+ 2 DEG C time, air-conditioning enters into the defrost stage.
In other words, be worth understanding, when air-conditioning is during in the first subcase or the second subcase, the wind speed of indoor fan is not gentle breeze state.
In the 4th, subcase is in the running of compressor, in the time that the running time of compressor, t did not reach the second scheduled time t2, just detects that difference △ T is less than predetermined threshold △ T
newly, and difference △ T is less than predetermined threshold △ T
newlysituation be continued until when t running time of compressor reaches the second scheduled time t2, in other words, in the time that the running time of compressor, t reached the second scheduled time t2, difference △ T is still less than predetermined threshold △ T
newly, showing that air-conditioning frosting is serious, air-conditioning enters into the defrost stage, now defrost time D T
alwaysbe forced to 10 minutes, to ensure defrosting effect.
In the defrost stage, after compressor the 6th scheduled time △ t1 first out of service, bring into operation, first outdoor fan and cross valve move after the 7th scheduled time △ t3 out of service, and first outdoor fan moves after the 8th scheduled time △ t2 out of service, as defrost time D T
alwaysto or current continuity the 5th scheduled time t5 that compressor detected when meeting or exceeding defrost and exiting current parameters, defrost finishes.Then the air-conditioning time started is the defrost tenth skill of the 9th scheduled time △ t4, and now compressor is out of service, and indoor fan keeps run-stopping status, after cross valve the tenth scheduled time △ t5 out of service, brings into operation, and outdoor fan is in running status.Thereby air-conditioning completes the defrosting action in a stage, t running time of air-conditioning makes zero, and then compressor enters into heating mode again, and in the running of compressor, continues to detect t running time of compressor, and detect outdoor fan and whether close, so circulation.
The Defrost method of describing the air-conditioning of a specific embodiment according to the present invention below with reference to Fig. 4, describes as high wind as example taking the wind speed of indoor fan below.
Set defrost parameter value △ T
high=17 DEG C, ta=60 minute, tb=80 minute, tc=95 minute, td=110 minute, te=120 minute, DT1=6 minute, △ t1=35, △ t2=10, △ t3=30, △ t4=20, △ t5=17, the first scheduled time t1 is 90 minutes, the second scheduled time t2 is 42 minutes, and the 3rd scheduled time t3 is 120 minutes.
Compressor enters into heating mode and indoor fan is high wind operation, detect that outdoor fan is 70 minutes in t running time of continuously running duty and detection compressor, t running time that is compressor was greater than for second scheduled time and was less than for the 3rd scheduled time, indoor environment temperature T1=20 DEG C now detected, the temperature T 2=36.5 DEG C of indoor heat exchanger, calculates predetermined threshold △ T according to formula
newly:
1) calculate defrost temperature difference correction factor △ T2:
A) in the time of T1 >=18 DEG C, Δ T2=0
2) calculate △ T
newly:
△ T
newly=△ T
new peak=△ T
high-Δ T2=△ T
high=17 DEG C.
T=T2-T1=36.5 DEG C of-20 DEG C=16.5 DEG C < △ T of this time difference value △
newly, air-conditioning enters into the defrost stage.
In the defrost stage, the current continuity that does not occur compressor meets or exceeds defrost in 7 seconds and exits current parameters, now according to following table:
T running time of compressor is positioned at situation 2, thus the defrost time D T of air-conditioning
alwaysit is 7 minutes.
At defrost time D T
alwaysin, first after compressor 35s out of service, bring into operation until the defrost time finishes, always out of servicely after cross valve operation 30s finish to the defrost time, always out of servicely after outdoor fan operation 30s finish to the defrost time, indoor fan moves and out of servicely after 10s finishes to the defrost time, and in the time defrost tenth skill that is 20s, compressor is out of service, cross valve continues to close after 17 seconds and brings into operation, and outdoor fan is in running status, and indoor fan is out of service.After defrost finishes, t running time of compressor makes zero, and compressor enters heating mode again, so repeats.
According to other configuration examples of the air-conditioning of the embodiment of the present invention as evaporimeter and condenser etc. and operation be all known for those of ordinary skills, be not described in detail here.
In the description of this description, the description of reference term " embodiment ", " some embodiment ", " illustrative examples ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And specific features, structure, material or the feature of description can be with suitable mode combination in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, those having ordinary skill in the art will appreciate that: in the situation that not departing from principle of the present invention and aim, can carry out multiple variation, amendment, replacement and modification to these embodiment, scope of the present invention is limited by claim and equivalent thereof.
Claims (9)
1. a Defrost method for air-conditioning, described air-conditioning comprises compressor, indoor fan, indoor heat exchanger, outdoor fan and cross valve, it is characterized in that, comprises the steps:
S1: described compressor enters heating mode, and detect t running time of described compressor, detect described outdoor fan simultaneously and whether close;
S2: in the time detecting in step S1 that described outdoor fan is intermittently closed, detect and close and when described compressor operating, whether the accumulated running time t of described compressor reaches the first scheduled time t1 when described outdoor fan;
S3: in the time detecting that accumulated running time t is more than or equal to the first scheduled time t1, described air-conditioning enters into the defrost stage, in the time detecting that accumulated running time t is less than the first scheduled time t1, gets back to step S2;
S4: in the time described outdoor fan continuous service being detected in step S1, whether t running time that detects described compressor is greater than the second scheduled time t2, and in the process of described compressor operating by the temperature T of the described indoor heat exchanger detecting 2 difference △ T=T2-T1 and the predetermined threshold △ T with indoor environment temperature T1
newlycompare;
S5: in the time detecting in step S4 that t running time of described compressor is greater than the second scheduled time t2 and is less than the 3rd scheduled time t3, whether the △ T that judgement detects is less than predetermined threshold △ T
newly;
S6: in the time of being judged as YES in step S5, described air-conditioning enters the defrost stage, in the time of being judged as NO of step S5, continuing the △ T that judgement detects and whether is less than △ T
newly;
S7: in the time detecting in step S4 that t running time of described compressor is greater than the 3rd scheduled time t3, whether the △ T that judgement detects is less than △ T
newly+ 2 DEG C;
S8: in the time of being judged as YES in step S7, described air-conditioning enters the defrost stage, in the time of being judged as NO in step S7, continuing the △ T that judgement detects and whether is less than △ T
newly+ 2 DEG C;
S9: in the described defrost stage, when described operation of air conditioner defrost time D T
alwaysor when defrost end signal detected, defrost finishes, and gets back to step S1, so circulation.
2. the Defrost method of air-conditioning according to claim 1, is characterized in that, step S4 also comprises:
S41: in the process of described compressor operating, when the difference △ T detecting is less than △ T
newlytime, whether t running time that detects described compressor is greater than described the second scheduled time t2;
S42: in the time of t<t2, continue to detect in the time that the running time of described compressor, t equaled described the second scheduled time t2, whether difference △ T is still less than △ T
newly;
S43: in the time of being judged as YES in step S42, set defrost time D T
alwaysbe the 4th scheduled time t4.
3. the Defrost method of air-conditioning according to claim 2, is characterized in that, described the 4th scheduled time t4 is ten minutes.
4. the Defrost method of air-conditioning according to claim 1, is characterized in that, the △ T in step S4-S8
newlyby △ T
wind speed, indoor environment temperature T1 and defrost temperature difference correction factor △ T2 compute draw:
1) calculate △ T2:
A) in the time of T1 >=18 DEG C, Δ T2=0;
B) in the time of 18 DEG C of 0≤T1 <, Δ T2=(20-T1)/8, directly adopting the shift division of single-chip microcomputer, result only has integer part;
C) in the time of T1 < 0, Δ T2=2;
2) calculate △ T
newly:
△ T
newly=△ T
wind speed-Δ T2; Wherein △ T
wind speedfor the defrost parameter value of setting according to the wind speed of described indoor fan.
5. the Defrost method of air-conditioning according to claim 1, is characterized in that, also comprises the steps:
S10: in the time described compressor operating being detected to described the second scheduled time t2 in step S4, whether the wind speed that detects described indoor fan is gentle breeze;
S11: in the time detecting that described wind speed is gentle breeze, enter into the defrost stage, when detecting that described wind speed is not during for gentle breeze, whether t running time that detects described compressor is greater than described the 3rd scheduled time t3;
S12: in the time detecting that t running time of described compressor is greater than the second scheduled time t2 and is less than the 3rd scheduled time t3, and the △ T that judgement detects is less than predetermined threshold △ T
newlytime, described air-conditioning enters the defrost stage; In the time detecting that t running time of described compressor is greater than the 3rd scheduled time t3, and the △ T that judgement detects is less than △ T
newly+ 2 DEG C time, described air-conditioning enters the defrost stage.
6. the Defrost method of air-conditioning according to claim 1, is characterized in that, described defrost end signal is that current continuity the 5th scheduled time t5 that described compressor detected meets or exceeds defrost and exits current parameters.
7. the Defrost method of air-conditioning according to claim 6, is characterized in that, described the 5th scheduled time t5 is 7 seconds.
8. according to the Defrost method of the air-conditioning described in any one in claim 1-7, it is characterized in that, at described defrost time D T
alwaysin, described compressor the 6th scheduled time △ t1 first out of service, then described compressor starts operation; First described outdoor fan and described cross valve move the 7th scheduled time △ t3, and then described outdoor fan and described cross valve are out of service; First described indoor fan moves the 8th scheduled time △ t2, and then described indoor fan is out of service.
9. the Defrost method of air-conditioning according to claim 1, it is characterized in that, in step S9, described air-conditioning has the defrost tenth skill of the 9th scheduled time △ t4 after defrost finishes, in described the 9th scheduled time △ t4, described compressor and described indoor fan are out of service, after described cross valve the tenth scheduled time △ t5 out of service, bring into operation, described outdoor fan operation.
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