CN104019531B - The Defrost method of air-conditioner and air-conditioner - Google Patents
The Defrost method of air-conditioner and air-conditioner Download PDFInfo
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- CN104019531B CN104019531B CN201410242093.9A CN201410242093A CN104019531B CN 104019531 B CN104019531 B CN 104019531B CN 201410242093 A CN201410242093 A CN 201410242093A CN 104019531 B CN104019531 B CN 104019531B
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Abstract
The invention provides the Defrost method of a kind of air-conditioner and air-conditioner。Wherein, the Defrost method of air-conditioner includes: after receiving enabling signal, and the second temperature-detecting device detects the second temperature value；Comparative result according to the second temperature value and the first preset temperature value judges whether that starting defrosting processes；When air-conditioner starts defrosting process, the temperature of the first temperature-detecting device detection heat exchanger tube, export the first temperature value, calculate the temperature difference between current second temperature value and the first temperature value, if the temperature difference is more than the second preset temperature value, then normally open solenoid valve energising Guan Bi。By technical scheme provided by the invention, start in defrosting process at the flow direction being changed cold-producing medium by cross valve commutation, it is possible to effectively shorten the defrost time。
Description
Technical field
The present invention relates to household appliance technical field, more specifically, relate to the Defrost method of a kind of air-conditioner and a kind of air-conditioner。
Background technology
Air-source heat pump air conditioner is low in outdoor temperature, and when having heating operation under the environment of certain humidity, after running a period of time, outdoor heat converter can produce frost layer, after frost layer produces, the ventilating duct making outside exchanger narrows, cause that outside air circulation diminishes, so that the evaporating temperature of the cold-producing medium of flowing declines in outdoor heat converter, outside evaporating temperature reduction can further result in the wall surface temperature of the ventilating duct of outdoor heat converter and decline, thus it is more prone to frosting, and then make frost layer thickening gradually, the exchange capability of heat of outdoor heat exchanger is with the increase of frost thickness and dramatic drop-off, therefore the heat that indoor heat exchanger sheds also reduces therewith, the comfortableness that impact is indoor。
For avoiding the frost layer impact on heating capacity, it will be defrosted when frost layer at outdoor heat exchanger reaches certain thickness, the Defrost method that currently used air-conditioner is conventional mainly has hot gas bypass defrosting, reverse circulation to defrost, wherein, the flow direction that the wide variety of Defrost mode of air source heat pump air conditioner is the commutation change cold-producing medium by cross valve defrosts, i.e. reverse circulation defrosting。And the process of defrosting concern is primarily with frost layer whether thoroughly except clean, defrosting action whether frequently, whether there is the problems such as frostless defrost, if frost layer is not except thorough, when continuing again to heat, the frost layer do not removed and defrosting water will be frozen into the bigger frost of density or ice, it is difficult at next defrosting cycle, frost layer be removed, causes vicious cycle, have a strong impact on heating effect, frostless defrost, frequently defrosting, defrosting time is long all can cause that fluctuations in indoor temperature is relatively big, and body-sensing comfortableness is poor；Additionally, reason due to outdoor fan and outdoor heat exchanger self structure, outdoor heat exchanger air quantity wind speed everywhere has certain difference, the amount of the cold-producing medium that each stream flows through is also not all the same, in defrosting process, ubiquitous phenomenon is that the frost layer of one or several stream on outdoor heat exchanger top is easy to thoroughly remove, the frost layer of one or several stream on top is thoroughly except the clean time accounts for the only small part of whole defrost time, and the frost layer at supercooling tube place is most difficult to remove totally bottom bottom frost layer especially outdoor heat exchanger, the most of the time of defrost is except the frost layer of this position。
Summary of the invention
It is contemplated that at least solve one of technical problem of existence in prior art。
For this, it is an advantage of the invention to provide the Defrost method of a kind of air-conditioner that can effectively shorten the defrost time。
It is a further object of the invention to provide a kind of air-conditioner。
For achieving the above object, first aspect present invention embodiment provides the Defrost method of a kind of air-conditioner, described air-conditioner includes: outdoor heat exchanger, first temperature-detecting device, second temperature-detecting device and normally open solenoid valve, described outdoor heat exchanger has multiple diverter branch and a supercooling tube, the outlet of multiple described diverter branchs is connected by the first pipeline and the first primary flow path, the import of multiple described diverter branchs is connected with one end of described supercooling tube, the other end and second pipeline of described supercooling tube are connected, described normally open solenoid valve is arranged on described first pipeline, and between the n-th diverter branch and (n+1)th diverter branch above described first pipeline is connected port with described first primary flow path, then after described normally open solenoid valve energising Guan Bi, coolant only enters described first pipeline from the described diverter branch after (n+1)th be positioned at below described normally open solenoid valve, described first temperature-detecting device is arranged on the import department of diverter branch described in n-th, described second temperature-detecting device is arranged on described second pipeline, described Defrost method includes:
After receiving enabled instruction, described second temperature-detecting device detects and exports current second temperature value；
Comparative result according to described current second temperature value and the first preset temperature value judges whether that starting defrosting processes, if described current second temperature value is less than described first preset temperature value, then described air-conditioner starts defrosting process；
When described air-conditioner starts defrosting process, described first temperature-detecting device detects the temperature of diverter branch described in n-th and exports current first temperature value, calculate the temperature difference between current second temperature value and current first temperature value, if the described temperature difference is more than the second preset temperature value, then described normally open solenoid valve energising Guan Bi；
Wherein, n is the integer be more than or equal to 1。
The Defrost method of air-conditioner provided by the invention, carry out in defrosting process at the flow direction being changed cold-producing medium by cross valve commutation, can effectively shorten the defrost time in each defrost cycle, thus improve the heating capacity in whole defrost cycle, add low-temperature heating capacity simultaneously, reduce the fluctuation of indoor temperature, and then improve the comfortableness of indoor。
It addition, the Defrost method according to the air-conditioner of the above embodiment of the present invention offer also has following additional technical feature:
According to one embodiment of present invention, described Defrost method also includes: carry out in defrosting processing procedure at described air-conditioner, if current second temperature value is more than the 3rd preset temperature value, then described air-conditioner stops defrosting process。
According to one embodiment of present invention, when described air-conditioner starts defrosting process, close the first blower fan and the compressor of described air-conditioner, and when described air-conditioner starts defrosting process, start timing, after the first preset time period, close the second blower fan of described air-conditioner, after the second preset time period, make the cross valve of described air-conditioner commutate, after the 3rd preset time period, opening described compressor；
When described air-conditioner stops defrosting process, described normally open solenoid valve power-off restoration, described first blower fan, described second blower fan are opened, close described compressor, and when described air-conditioner stops defrosting process, start timing, after the 4th preset time period, opening described compressor。
According to one embodiment of present invention, described first preset temperature value includes the first preset value and the second preset value, when described air-conditioner is in heating mode, judge whether that starting defrosting process specifically includes: described compressor continuous service is after at least 7 minutes, calculate the difference of the maximum in each second temperature value having detected that and the second current temperature value, if described difference is be more than or equal to described first preset value, and the second current temperature value at least continues 5 minutes less than or equal to the 4th preset temperature value, heat cycle operation at least 45 minutes, then make described air-conditioner start defrosting to process；Or, described compressor continuous service is after at least 7 minutes, if described second temperature value detected is continuously less than described second preset value, then makes described air-conditioner start defrosting and processes。
According to one embodiment of present invention, described first value is 3 DEG C, and described second value is for-10 DEG C, and described second preset temperature value is between 3 DEG C to 7 DEG C, and described 3rd preset temperature value is between 18 DEG C to 23 DEG C, and described 4th preset temperature value is-3 DEG C。
Second aspect present invention embodiment provides a kind of air-conditioner, including: outdoor heat exchanger, described outdoor heat exchanger has a supercooling tube and multiple diverter branch, first end of multiple described diverter branchs is all connected with the first end of described supercooling tube, second end is all connected with the first pipeline, second end of described supercooling tube is connected with throttling arrangement by the second pipeline, described first pipeline is provided with normally open solenoid valve, described second pipeline is provided with the second temperature-detecting device, for detecting the temperature of described second pipeline, and export the second temperature value；Cross valve, the condenser port of described cross valve is connected with described first pipeline by the first primary flow path, between the described normally open solenoid valve the n-th diverter branch and (n+1)th diverter branch above described first pipeline is connected port with described first primary flow path, import department at diverter branch described in n-th is provided with the first temperature-detecting device, for detecting the temperature of diverter branch described in n-th, and export the first temperature value；And processor, described processor is connected with described first temperature-detecting device, described second temperature-detecting device and described normally open solenoid valve, described processor receives described first temperature value of described first temperature-detecting device output and described second temperature value of described second temperature-detecting device output, comparative result according to described second temperature value and the first preset temperature value judges whether that starting defrosting processes, and calculate the temperature difference between described first temperature value and described second temperature value, the state of described normally open solenoid valve is controlled according to the described temperature difference；Wherein, n is the integer be more than or equal to 1。
The air-conditioner that second aspect present invention embodiment provides, carry out in defrosting process at the flow direction being changed cold-producing medium by cross valve commutation, can effectively shorten the defrost time in each defrost cycle, thus improve the heating capacity in whole defrost cycle, add low-temperature heating capacity simultaneously, reduce the fluctuation of indoor temperature, and then improve the comfortableness of indoor。
It addition, the air-conditioner according to the above embodiment of the present invention offer also has following additional technical feature:
According to one embodiment of present invention, described processor includes: judging unit, carry out in defrosting processing procedure at described air-conditioner, judge that whether current second temperature value is more than the 3rd preset temperature value, when determining current second temperature value more than three preset temperature value, control described air-conditioner and stop defrosting process。
According to one embodiment of present invention, described processor also includes: timing unit, when described air-conditioner starts defrosting process, start timing, when determining the first preset time period, the first notice is sent to the first control unit, when determining the second preset time period, send the second notice to described first control unit, when determining three preset time period, send third notice to described first control unit, and when described air-conditioner stops defrosting process, start timing, when determining four preset time period, send the 4th notice to the second control unit；Described first control unit, when described air-conditioner starts defrosting process, close the first blower fan and the compressor of described air-conditioner, and when receiving described first notice, close the second blower fan of described air-conditioner, when receiving described second notice, control the cross valve commutation of described air-conditioner, when receiving described third notice, open described compressor；With described second control unit, described air-conditioner stop defrosting processing time, control described normally open solenoid valve power-off restoration, open described first blower fan and described second blower fan, close described compressor, and when receiving described 4th notice, open described compressor。
According to one embodiment of present invention, described first preset temperature value includes the first preset value and the second preset value, described processor includes: the 3rd control unit, when described air-conditioner is under heating mode and after described compressor continuous service at least 7 minutes, calculate the difference of the maximum in each second temperature value having detected that and the second current temperature value, if described difference is be more than or equal to described first preset value, and the second current temperature value at least continues 5 minutes less than or equal to the 4th preset temperature value, heat cycle operation at least 45 minutes, or, when described air-conditioner is under heating mode and after described compressor continuous service at least 7 minutes, if described second temperature value detected is continuously less than described second preset value, then make described air-conditioner start defrosting to process。
According to one embodiment of present invention, described first temperature-detecting device and described second temperature-detecting device are temperature sensor, and described throttling arrangement is electric expansion valve。
The additional aspect of the present invention and advantage will provide in description below part, and part will become apparent from the description below, or is recognized by the practice of the present invention。
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage are from conjunction with will be apparent from easy to understand the accompanying drawings below description to embodiment, wherein:
Fig. 1 is the structural representation of the air-conditioner according to one embodiment of the invention；
Fig. 2 is the structural representation of the Defrost method of the air-conditioner according to another embodiment of the present invention；
Fig. 3 be the air-conditioner shown in Fig. 2 Defrost method in the waveform diagram being turned on and off of each parts of air-conditioner。
Wherein, in Fig. 1, corresponding relation between accompanying drawing labelling and component names is:
100 air-conditioners, 11 outdoor heat exchangers, 111 diverter branchs, 112 supercooling tubes, 113 first primary flow path, 114 first pipelines, 115 second pipelines, 12 throttling arrangements, 13 normally open solenoid valves, 14 first temperature-detecting devices, 15 second temperature-detecting devices, 16 cross valves, 17 compressors, 18 first blower fans, 19 first diverters, 21 indoor heat exchangers, 211 second diverter branchs, 22 second blower fans, 23 second diverters。
Detailed description of the invention
In order to be more clearly understood that the above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail。It should be noted that when not conflicting, embodiments herein and the feature in embodiment can be mutually combined。
Elaborate a lot of detail in the following description so that fully understanding the present invention, but, the present invention can also adopt other to be different from mode described here to implement, and therefore, protection scope of the present invention is by the restriction of following public specific embodiment。
1 the air-conditioner 100 provided according to some embodiments of the invention is described with reference to the accompanying drawings。
As it is shown in figure 1, the air-conditioner 100 that one embodiment of the invention provides, including: outdoor heat exchanger 11, indoor heat exchanger 21, cross valve 16, compressor the 17, first blower fan the 18, second blower fan 22 and processor。
Wherein, outdoor heat exchanger 11 has a supercooling tube 112 and multiple diverter branch 111, first end of multiple diverter branchs 111 is all connected with the first end of supercooling tube 112, second end is all connected with the first pipeline 114, second end of supercooling tube 112 is connected with throttling arrangement 12 by the second pipeline 115, the first pipeline 114 is provided with normally open solenoid valve 13, the second pipeline 115 is provided with the second temperature-detecting device 15, for detecting the temperature of the second pipeline 115, and export the second temperature value；Indoor heat exchanger 21 is connected with outdoor heat exchanger 11 by throttling arrangement 12；The condenser port of cross valve 16 is connected with the first pipeline 114 by the first primary flow path 113, between the normally open solenoid valve 13 n-th diverter branch and (n+1)th diverter branch above the first pipeline 114 is connected port with the first primary flow path 113, import department at the n-th diverter branch is provided with the first temperature-detecting device 15, for detecting the temperature of the n-th diverter branch, and exporting the first temperature value, the vaporizer port of cross valve 16 is connected with indoor heat exchanger 21；The air inlet of compressor 17 is connected with the exhaust port of cross valve 16, and gas returning port is connected with the suction nozzle port of cross valve 16；First blower fan 18 is oppositely arranged with outdoor heat exchanger 11；Second blower fan 22 is oppositely arranged with indoor heat exchanger 21；Processor is connected with first temperature-detecting device the 14, second temperature-detecting device 15 and normally open solenoid valve 13, processor receives the first temperature value of the first temperature-detecting device 14 output and the second temperature value of the second temperature-detecting device 15 output, comparative result according to the second temperature value and the first preset temperature value judges whether that starting defrosting processes, and and calculate the temperature difference between the first temperature value and the second temperature value, according to the temperature difference control normally open solenoid valve 13 state。
The air-conditioner outdoor unit that the present embodiment provides, carry out in defrosting process at the flow direction being changed cold-producing medium by cross valve 16 commutation, can effectively shorten the defrost time in each defrost cycle, thus improve the heating capacity in whole defrost cycle, add low-temperature heating capacity simultaneously, reduce the fluctuation of indoor temperature, and then improve the comfortableness of indoor, specifically, first pipeline 114 arranges normally open solenoid valve 13, and normally open solenoid valve 13 is positioned on the first primary flow path 113, when having just enter into defrost, normally open solenoid valve 13 is still for leaving, the each stream of outdoor heat exchanger 11 is all unimpeded, commutation due to cross valve 16, the flow direction of cold-producing medium changes, the temperature of outdoor heat exchanger 11 raises, start defrost, when the temperature difference between the first temperature value and the second temperature value is be more than or equal to the temperature value arranged, judge to be positioned at the frost layer of each diverter branch 111 of the outdoor heat exchanger 11 of normally open solenoid valve more than 13 thoroughly to change clean and fin and dry, now defrost carries out t1 minute, and it is positioned at the frost layer of each diverter branch 111 of the outdoor heat exchanger 11 of normally open solenoid valve less than 13 at t1 during this period of time also in defrost, impact due to the defrosting water of each diverter branch 111 by normally open solenoid valve more than 13, do not change clean, particularly outdoor heat exchanger 11 is more near the residual frost in chassis place, now processor control normally open solenoid valve 13 is energized, normally open solenoid valve 13 closes, the each diverter branch 111 being positioned at normally open solenoid valve more than 13 is made to pass through without cold-producing medium, also empty calory scatters and disappears, namely whole cold-producing mediums concentrate on circulation in each diverter branch 111 of below normally open solenoid valve 13 installation site, so, be equivalent to reduce the effective heat exchange area of outdoor heat exchanger 11, concentrate heat that residual frost is melted, thus effectively increasing the speed of defrost, when defrost terminates, processor controls normally open solenoid valve 13 power-off, normally open solenoid valve 13 is opened, the time t2 of the closedown of normally open solenoid valve 13, total defrost time t1+t2, total defrost time is substantially short than the defrosting time adopting tradition Defrost mode, and can thoroughly defrost, avoid frequently defrosting and the phenomenon such as defrosting time is long, thus improve the heating capacity in whole defrost cycle, add low-temperature heating capacity simultaneously, reduce the fluctuation of indoor temperature, and then improve the body-sensing comfortableness heating environment。
It should be noted that normally open solenoid valve 13 should be installed under comparable conditions, t1+t2's and minimum position, namely comprehensive defrost shortest time place。
Preferably, processor includes: judging unit, carries out in defrosting processing procedure at air-conditioner, it is judged that whether current second temperature value is more than the 3rd preset temperature value, when determining current second temperature value more than three preset temperature value, controls air-conditioner and stops defrosting process。
Further, preferably, as shown in Figure 2, processor also includes: timing unit, when air-conditioner starts defrosting process, start timing, when determining the first preset time period, send the first notice to the first control unit, when determining the second preset time period, send the second notice to the first control unit, when determining three preset time period, send third notice to the first control unit, and when air-conditioner stops defrosting process, start timing, when determining four preset time period, send the 4th notice to the second control unit；First control unit, when air-conditioner starts defrosting process, closes the first blower fan 18 and compressor 17, and when receiving the first notice, close empty second blower fan 22, when receiving the second notice, control cross valve 16 to commutate, when receiving third notice, open compressor 17；With the second control unit, air-conditioner stop defrosting processing time, control normally open solenoid valve 13 power-off restoration, open the first blower fan 18 and the second blower fan 19, close compressor 17, and when receiving the 4th notice, open compressor 17。
Wherein, the first preset time period is 13 seconds to 17 seconds, and the second preset time period is 18 seconds to 22 seconds, and the 3rd preset time period is 23 seconds to 27 seconds, and the 4th preset time period is 18 seconds to 22 seconds。
Preferably, first preset temperature value includes the first preset value and the second preset value, processor includes: the 3rd control unit, when air-conditioner is under heating mode and after compressor continuous service at least 7 minutes, calculate the difference of the maximum in each second temperature value having detected that and the second current temperature value, if difference is be more than or equal to the first preset value, and the second current temperature value at least continues 5 minutes less than or equal to the 4th preset temperature value, heat cycle operation at least 45 minutes, or, when air-conditioner is under heating mode and after compressor continuous service at least 7 minutes, if the second temperature value detected is continuously less than the second preset value, then make air-conditioner start defrosting to process。
Wherein, the first preset value is 3 DEG C, and the second preset value is-10 DEG C, and the second preset temperature value is between 3 DEG C to 7 DEG C, and the 3rd preset temperature value is between 18 DEG C-23 DEG C, and the 4th preset temperature value is-3 DEG C。
As illustrated in fig. 1, it is preferred that the second end of multiple diverter branchs 111 is connected with the first end of supercooling tube 112 by the first diverter 19。
The setting of the first diverter 19 so that the coolant entering each diverter branch from supercooling tube 112 is all identical, so that the coolant in outdoor heat exchanger 11 is uniform, and then ensure that the heat transfer effect of outdoor heat exchanger 1111。
Specifically, the first temperature-detecting device 14 and the second temperature-detecting device 15 are temperature sensor, and throttling arrangement 12 is electric expansion valve。
Temperature sensor can the temperature of the temperature of the direct feeling diverter branch 111 corresponding with normally open solenoid valve 13 place and the second pipeline, and the temperature transition of impression becomes the temperature value that processor needs export, and temperature sensor can control the state of normally open solenoid valve 13 for processor and provide data foundation accurately, thus ensure that the defrosting effect of air-conditioner 100。
Preferably, indoor heat exchanger 21 includes multiple second diverter branch 211, is connected with throttling arrangement 12 after the first end parallel connection of multiple second diverter branchs 211, is connected with vaporizer port after the first end parallel connection of multiple second diverter branchs 211。
Specifically, it is connected with throttling arrangement 12 by the second diverter 23 after the first end parallel connection of multiple second diverter branchs 211。
The setting of the second diverter 23 so that the coolant entering each second diverter branch 211 from throttling arrangement 12 is all identical, so that the coolant in indoor heat exchanger 21 is uniform, and then ensure that the heat transfer effect of indoor heat exchanger 21。
With reference to the accompanying drawings 1 and Fig. 2 the Defrost method of air-conditioner provided according to some embodiments of the invention is described。
The Defrost method of the air-conditioner that another embodiment of the present invention provides, as shown in Figure 1, air-conditioner includes: outdoor heat exchanger 10, first temperature-detecting device 14, second temperature-detecting device 15 and normally open solenoid valve 13, outdoor heat exchanger has multiple diverter branch 111 and a supercooling tube 112, the outlet of multiple diverter branchs 111 is connected with the first primary flow path 113 by the first pipeline 114, the import of multiple diverter branchs 111 is connected with one end of supercooling tube 112, the other end and second pipeline 115 of supercooling tube 112 are connected, normally open solenoid valve 13 is arranged on the first pipeline 114, and between the n-th diverter branch and (n+1)th diverter branch above the first pipeline 114 is connected port with the first primary flow path 113, then after normally open solenoid valve 13 energising Guan Bi, coolant only enters the first pipeline 114 from the diverter branch after (n+1)th be positioned at below normally open solenoid valve 13, first temperature-detecting device 14 is arranged on the import department of the n-th diverter branch, second temperature-detecting device 15 is arranged on the second pipeline 115；
As in figure 2 it is shown, Defrost method includes:
Step 102, after receiving enabled instruction, the second temperature-detecting device detects and exports current second temperature value；
Step 104, processor judges whether to defrosting according to the comparative result of current second temperature value and the first preset temperature value, if current second temperature value is less than the first preset temperature value, carries out defrosting and performs step 106, otherwise performs step 102；
Step 106, when air-conditioner carries out defrosting process, closes the first blower fan and the compressor of air-conditioner, and when air-conditioner starts defrosting process, start timing, after the first preset time period, close the second blower fan of air-conditioner, after the second preset time period, the cross valve making air-conditioner commutates, and after the 3rd preset time period, is opening compressor, make the temperature of the first temperature-detecting device detection heat exchanger tube, export the first temperature value；
Step 108, calculates the temperature difference between the second current temperature value and the first temperature value, and the temperature difference and the second preset temperature value is compared, and according to judging whether Guan Bi normally open solenoid valve, if Guan Bi normally open solenoid valve performs step 110, otherwise performs step 106；
Step 110, normally open solenoid valve energising Guan Bi；
Step 112, the second relatively more current temperature value and the 3rd preset temperature value, judge whether to stop defrosting according to comparative result, if stopping defrosting performing step 114, otherwise performs step 110；
Step 114, normally open solenoid valve power-off restoration, the first blower fan, the second blower fan are opened, close compressor, and when air-conditioner stops defrosting process, start timing, after the 4th preset time period, are opening compressor。
Wherein, the second preset temperature value is between 3 DEG C to 7 DEG C, and the 3rd preset temperature value is between 18 DEG C-23 DEG C；
First preset time period is 13 seconds to 17 seconds, and the second preset time period is 18 seconds to 22 seconds, and the 3rd preset time period is 23 seconds to 27 seconds, and the 4th preset time period is 18 seconds to 22 seconds。
The Defrost method of the air-conditioner that the present embodiment provides, carry out in defrosting process at the flow direction being changed cold-producing medium by cross valve commutation, can effectively shorten the defrost time in each defrost cycle, thus improve the heating capacity in whole defrost cycle, add low-temperature heating capacity simultaneously, reduce the fluctuation of indoor temperature, and then improve the comfortableness of indoor, specifically, after meeting defrost condition, cross valve commutation starts defrosting, now all streams all start defrosting, during defrosting, outside blower fan stops operating, cold-producing medium in each diverter branch of outdoor heat exchanger is gradually lowered from import to the temperature of outlet, by the supercooling tube porch bottom the first diverter remittance to outdoor heat exchanger, now, the frost layer of each diverter branch is subject to heat that this stream cold-producing medium is with and the heating of the heat that adjacent lower section stream cold-producing medium brings simultaneously, so the frost layer being positioned at outdoor heat exchanger top is easy to, thoroughization is clean and the used time is shorter；And although the diverter branch of outdoor heat exchanger bottom is during this period of time also in defrost, but owing to being subject to the impact of each stream defrosting water in top, temperature is on the low side compared with the temperature of top each stream each wall of ventilating duct, so the defrost of outdoor heat exchanger bottom stream carries out slowly, the cold-producing medium of the entrance of the supercooling tube bottom outdoor heat exchanger is the cold-producing medium after the defrosting of all above flowing path outlet place, temperature is relatively lower, being more difficult to of frost layer at supercooling tube place is clean, when having just enter into defrost, normally open solenoid valve is still for leaving, the each stream of outdoor heat exchanger is all unimpeded, commutation due to cross valve, the flow direction of cold-producing medium changes, the temperature of outdoor heat exchanger raises, start defrost, when the temperature difference between the second temperature value and the first temperature value is be more than or equal to the second preset temperature value, judge to be positioned at the frost layer of each diverter branch of the outdoor heat exchanger of more than normally open solenoid valve thoroughly to change clean and fin and dry, now defrost carries out t1 minute, and it is positioned at the frost layer of each diverter branch of the outdoor heat exchanger of below normally open solenoid valve at t1 during this period of time also in defrost, impact due to the defrosting water by each diverter branch more than normally open solenoid valve, do not change clean, residual frost especially proximate to supercooling tube place is more, now processor controls normally open solenoid valve energising pass, normally open solenoid valve closes, the each diverter branch being positioned at more than normally open solenoid valve is made to pass through without cold-producing medium, also empty calory scatters and disappears, namely whole cold-producing mediums concentrate on circulation in each diverter branch of below normally open solenoid valve installation site, so, be equivalent to reduce the effective heat exchange area of outdoor heat exchanger, concentrate heat that residual frost is melted, thus effectively increasing the speed of defrost, when defrost terminates, processor controls normally open solenoid valve power-off, normally open solenoid valve is opened, the time t2 of the closedown of normally open solenoid valve, total defrost time t=t1+t2, total defrost time is substantially short than the defrosting time adopting tradition Defrost mode, and can thoroughly defrost, avoid frequently defrosting and the phenomenon such as defrosting time is long, thus improve the heating capacity in whole defrost cycle, add low-temperature heating capacity simultaneously, reduce the fluctuation of indoor temperature, and then improve the body-sensing comfortableness heating environment。
Preferably, the first preset temperature value includes the first preset value and the second preset value, when air-conditioner is in heating mode, it may be judged whether starts defrosting process and specifically includes:
Compressor continuous service is after at least 7 minutes, calculate the difference of the maximum in each second temperature value having detected that and the second current temperature value, if difference is be more than or equal to the first preset value, and the second current temperature value at least continues 5 minutes less than or equal to the 4th preset temperature value, heat cycle operation at least 45 minutes, then make air-conditioner start defrosting and process；
Or, compressor continuous service is after at least 7 minutes, if the second temperature value detected is continuously less than the second preset value, then makes air-conditioner start defrosting and processes。
Wherein, the first preset value is 3 DEG C, and the second preset value is-10 DEG C, and the 4th preset temperature value is-3 DEG C。
Concrete operations below according to Fig. 2 and Fig. 3 Defrost method illustrating the air-conditioner that the present embodiment provides are as follows:
As shown in Figures 2 and 3, when entering defrost, first blower fan cuts out immediately, until defrost terminates, first blower fan is opened again, second blower fan is because to blow the waste heat of indoor heat exchanger and delayed 15 seconds close again, namely T4 is set to 10 seconds, after defrost terminates, the second blower fan starts with the startup of compressor, but the rotation speed change of the second blower fan is subject to the control of anti-cold fetch sequence, for preventing cross valve from having excessive sound when commutating, when entering defrost, compressor elder generation shut-in time T2 (T2 is set to 25 seconds) then opens, until defrost terminates, defrost terminates rear compressor and turns off 25 seconds, then open again；Cross valve turns off after compressor is closed 20 seconds, namely cross valve lag compressor when starting defrost is closed for 20 seconds, now cross valve commutation, except the cold-producing medium flow direction in compressor and the pipeline that is connected with compressor constant except, in other parts, the flow direction of cold-producing medium changes with the commutation of cross valve, until after defrost terminates, after compressor is closed 20 seconds, cross valve is opened again, and namely T3 is set to 5 seconds。Normally open solenoid valve is by following control mode action, when having just enter into defrost, normally open solenoid valve is still for leaving, the each stream of outdoor heat exchanger is all unimpeded, commutation due to cross valve, the flow direction of cold-producing medium changes, the temperature of outdoor heat exchanger raises, start defrost, when the temperature difference between the second temperature value and the first temperature value is be more than or equal to 3 DEG C, it is judged as being positioned at the frost layer of the above diverter branch of normally open solenoid valve thoroughly to change clean and fin and dry, now defrost carries out t1 minute, and it is positioned at the frost layer of the diverter branch of below normally open solenoid valve at t1 during this period of time also in defrost, owing to being subject to be positioned at the impact of the defrosting water of the diverter branch of more than normally open solenoid valve, do not change clean, particularly the residual frost at supercooling tube place, the nearly end is more, now normally open solenoid valve powers on pass, normally open solenoid valve closes, the diverter branch being positioned at more than normally open solenoid valve is made to pass through without cold-producing medium, also empty calory scatters and disappears, whole cold-producing mediums concentrate on the diverter branch circulation being arranged in below normally open solenoid valve, now be equivalent to reduce the effective heat exchange area of outdoor heat exchanger, concentrate heat that residual frost is melted, thus effectively accelerating defrost speed, decrease the defrost time, normally open solenoid valve power-off when defrost terminates, normally open solenoid valve is opened, the time t2 of the closedown of normally open solenoid valve, total defrost time t=t1+t2, total defrost time is substantially short than the defrosting time adopting tradition Defrost mode, and can thoroughly defrost, avoid frequently defrosting and the phenomenon such as defrosting time is long, add the periodicity heating capacity and low-temperature heating capacity that comprise the defrost time, improve the body-sensing comfortableness heating environment。
In sum, technical scheme provided by the invention, carry out in defrosting process at the flow direction being changed cold-producing medium by cross valve commutation, can effectively shorten the defrost time in each defrost cycle, thus improve the heating capacity in whole defrost cycle, add low-temperature heating capacity simultaneously, reduce the fluctuation of indoor temperature, and then improve the comfortableness of indoor。
In describing the invention, term " first ", " second ", " the 3rd " only for descriptive purposes, and it is not intended that instruction or hint relative importance, unless otherwise clearly defined and limited。
In describing the invention, term " being connected ", " connection " etc. all should be interpreted broadly, for instance, " being connected " can be joined directly together, it is also possible to is indirectly connected to by intermediary。For the ordinary skill in the art, it is possible to understand above-mentioned term concrete meaning in the present invention as the case may be。
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations。All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention。
Claims (10)
1. the Defrost method of an air-conditioner, it is characterized in that, described air-conditioner includes: outdoor heat exchanger, first temperature-detecting device, second temperature-detecting device and normally open solenoid valve, described outdoor heat exchanger has multiple diverter branch and a supercooling tube, the outlet of multiple described diverter branchs is connected by the first pipeline and the first primary flow path, the import of multiple described diverter branchs is connected with one end of described supercooling tube, the other end and second pipeline of described supercooling tube are connected, described normally open solenoid valve is arranged on described first pipeline, and between the n-th diverter branch and (n+1)th diverter branch above described first pipeline is connected port with described first primary flow path, then after described normally open solenoid valve energising Guan Bi, coolant only enters described first pipeline from the described diverter branch after (n+1)th be positioned at below described normally open solenoid valve, described first temperature-detecting device is arranged on the import department of diverter branch described in n-th, described second temperature-detecting device is arranged on described second pipeline, described Defrost method includes:
After receiving enabled instruction, described second temperature-detecting device detects and exports current second temperature value；
Comparative result according to described current second temperature value and the first preset temperature value judges whether that starting defrosting processes, if described current second temperature value is less than described first preset temperature value, then described air-conditioner starts defrosting process；
When described air-conditioner starts defrosting process, described first temperature-detecting device detects the temperature of diverter branch described in n-th and exports current first temperature value, calculate the temperature difference between current second temperature value and current first temperature value, if the described temperature difference is more than the second preset temperature value, then described normally open solenoid valve energising Guan Bi；
Wherein, n is the integer be more than or equal to 1。
2. the Defrost method of air-conditioner according to claim 1, it is characterised in that described Defrost method also includes:
Carrying out in defrosting processing procedure at described air-conditioner, if current second temperature value is more than the 3rd preset temperature value, then described air-conditioner stops defrosting process。
3. the Defrost method of air-conditioner according to claim 2, it is characterised in that
When described air-conditioner starts defrosting process, close the first blower fan and the compressor of described air-conditioner, and when described air-conditioner starts defrosting process, start timing, after the first preset time period, close the second blower fan of described air-conditioner, after the second preset time period, the cross valve making described air-conditioner commutates, and after the 3rd preset time period, is opening described compressor；
When described air-conditioner stops defrosting process, described normally open solenoid valve power-off restoration, described first blower fan, described second blower fan are opened, close described compressor, and when described air-conditioner stops defrosting process, start timing, after the 4th preset time period, opening described compressor。
4. the Defrost method of air-conditioner according to claim 3, it is characterised in that described first preset temperature value includes the first preset value and the second preset value, when described air-conditioner is in heating mode, it may be judged whether starts defrosting process and specifically includes:
Described compressor continuous service is after at least 7 minutes, calculate the difference of the maximum in each second temperature value having detected that and the second current temperature value, if described difference is be more than or equal to described first preset value, and the second current temperature value at least continues 5 minutes less than or equal to the 4th preset temperature value, heat cycle operation at least 45 minutes, then make described air-conditioner start defrosting and process；
Or, described compressor continuous service is after at least 7 minutes, if described second temperature value detected is continuously less than described second preset value, then makes described air-conditioner start defrosting and processes。
5. the Defrost method of air-conditioner according to claim 4, it is characterised in that
Described first preset value is 3 DEG C, and described second preset value is-10 DEG C, and described second preset temperature value is between 3 DEG C to 7 DEG C, and described 4th preset temperature value is-3 DEG C。
6. an air-conditioner, it is characterised in that including:
Outdoor heat exchanger, described outdoor heat exchanger has a supercooling tube and multiple diverter branch, first end of multiple described diverter branchs is all connected with the first end of described supercooling tube, second end is all connected with the first pipeline, second end of described supercooling tube is connected with throttling arrangement by the second pipeline, described first pipeline is provided with normally open solenoid valve, described second pipeline is provided with the second temperature-detecting device, for detecting the temperature of described second pipeline, and export the second temperature value；
Cross valve, the condenser port of described cross valve is connected with described first pipeline by the first primary flow path, between the described normally open solenoid valve the n-th diverter branch and (n+1)th diverter branch above described first pipeline is connected port with described first primary flow path, import department at diverter branch described in n-th is provided with the first temperature-detecting device, for detecting the temperature of diverter branch described in n-th, and export the first temperature value；With
Processor, described processor is connected with described first temperature-detecting device, described second temperature-detecting device and described normally open solenoid valve, described processor receives described first temperature value of described first temperature-detecting device output and described second temperature value of described second temperature-detecting device output, comparative result according to described second temperature value and the first preset temperature value judges whether that starting defrosting processes, and calculate the temperature difference between described first temperature value and described second temperature value, the state of described normally open solenoid valve is controlled according to the described temperature difference；
Wherein, n is the integer be more than or equal to 1。
7. air-conditioner according to claim 6, it is characterised in that described processor includes:
Judging unit, carries out in defrosting processing procedure at described air-conditioner, it is judged that whether current second temperature value is more than the 3rd preset temperature value, when determining current second temperature value more than three preset temperature value, controls described air-conditioner and stops defrosting process。
8. air-conditioner according to claim 7, it is characterised in that described processor also includes:
Timing unit, when described air-conditioner starts defrosting process, starts timing, when determining the first preset time period, send the first notice to the first control unit, when determining the second preset time period, send the second notice to described first control unit, when determining three preset time period, send third notice to described first control unit, and when described air-conditioner stops defrosting process, start timing, when determining four preset time period, send the 4th notice to the second control unit；
Described first control unit, when described air-conditioner starts defrosting process, close the first blower fan and the compressor of described air-conditioner, and when receiving described first notice, close the second blower fan of described air-conditioner, when receiving described second notice, control the cross valve commutation of described air-conditioner, when receiving described third notice, open described compressor；With
Described second control unit, when described air-conditioner stops defrosting process, controls described normally open solenoid valve power-off restoration, opens described first blower fan and described second blower fan, close described compressor, and when receiving described 4th notice, open described compressor。
9. air-conditioner according to claim 8, it is characterised in that described first preset temperature value includes the first preset value and the second preset value, and described processor includes:
3rd control unit, when described air-conditioner is under heating mode and after described compressor continuous service at least 7 minutes, calculate the difference of the maximum in each second temperature value having detected that and the second current temperature value, if described difference is be more than or equal to described first preset value, and the second current temperature value at least continues 5 minutes less than or equal to the 4th preset temperature value, heat cycle operation at least 45 minutes, or, when described air-conditioner is under heating mode and after described compressor continuous service at least 7 minutes, if described second temperature value detected is continuously less than described second preset value, then make described air-conditioner start defrosting to process。
10. air-conditioner according to claim 9, it is characterised in that
Described first temperature-detecting device and described second temperature-detecting device are temperature sensor, and described throttling arrangement is electric expansion valve。
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| CN201410242093.9A CN104019531B (en) | 2014-05-30 | 2014-05-30 | The Defrost method of air-conditioner and air-conditioner |
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| CN104634032B (en) * | 2015-01-30 | 2017-02-22 | 广东美的制冷设备有限公司 | Defrosting speed adjusting method, defrosting speed adjusting device and air conditioner |
| CN106091265B (en) * | 2016-06-17 | 2018-11-27 | 广东美的制冷设备有限公司 | The control method of air conditioner |
| CN106839301A (en) * | 2017-01-24 | 2017-06-13 | 青岛海尔空调器有限总公司 | Air-conditioner defrosting logic control method and device |
| CN107192094A (en) * | 2017-05-27 | 2017-09-22 | 宁波奥克斯电气股份有限公司 | A kind of defrosting control method of cabinet air-conditioner |
| CN107422396B (en) * | 2017-07-25 | 2020-04-17 | 广东美的暖通设备有限公司 | Foreign matter detection system, foreign matter detection method and heating and ventilation equipment |
| CN109469965B (en) * | 2017-09-08 | 2020-10-23 | 奥克斯空调股份有限公司 | Cleaning method of air conditioner |
| CN109489189B (en) * | 2017-09-08 | 2020-10-23 | 奥克斯空调股份有限公司 | Cleaning method of air conditioner |
| CN108954505B (en) * | 2018-05-24 | 2020-09-29 | 广东美的制冷设备有限公司 | Air conditioner |
| CN109237727A (en) * | 2018-08-28 | 2019-01-18 | 青岛海尔空调电子有限公司 | defrosting control method for air conditioner |
| CN111473556B (en) * | 2019-01-24 | 2021-12-31 | 新奥数能科技有限公司 | Defrosting method for air source low-temperature heat pump unit |
| CN111895599B (en) * | 2019-05-06 | 2022-11-18 | 青岛海尔空调器有限总公司 | Control method and device for defrosting of air conditioner and air conditioner |
| CN110173820B (en) * | 2019-05-21 | 2020-11-10 | 四川虹美智能科技有限公司 | Air conditioner defrosting control method and device |
| CN110469959B (en) * | 2019-07-24 | 2022-03-29 | 青岛海尔空调器有限总公司 | Control method and device for defrosting of air conditioner and air conditioner |
| CN110469977B (en) * | 2019-07-25 | 2022-09-02 | 青岛海尔空调器有限总公司 | Control method and device for defrosting of air conditioner and air conditioner |
| CN110736212B (en) * | 2019-09-27 | 2022-04-19 | 青岛海尔空调器有限总公司 | Control method and control device for defrosting of air conditioner and air conditioner |
| CN110595093A (en) * | 2019-09-30 | 2019-12-20 | 海信（广东）空调有限公司 | Air conditioning system |
| CN113587364A (en) * | 2020-04-30 | 2021-11-02 | 青岛海尔空调电子有限公司 | Defrosting control method for multi-split air conditioning unit |
| CN111964310A (en) * | 2020-08-27 | 2020-11-20 | 江苏康泰热交换设备工程有限公司 | Vapor supplementing and enthalpy increasing system and method for evaporator |
| CN113074452A (en) * | 2021-03-19 | 2021-07-06 | 海信（山东）空调有限公司 | Defrosting control method of air conditioner, air conditioner and storage medium |
| CN113154636B (en) * | 2021-04-25 | 2022-05-17 | 珠海格力电器股份有限公司 | Air conditioner defrosting control method and device, storage medium and air conditioner |
| CN113792413A (en) * | 2021-08-18 | 2021-12-14 | 东风汽车集团股份有限公司 | Simulation verification method and simulation verification system for defrosting performance of automobile air conditioner |
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