CN105371359A - Air conditioner and defrosting control method of air conditioner - Google Patents
Air conditioner and defrosting control method of air conditioner Download PDFInfo
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- CN105371359A CN105371359A CN201410440901.2A CN201410440901A CN105371359A CN 105371359 A CN105371359 A CN 105371359A CN 201410440901 A CN201410440901 A CN 201410440901A CN 105371359 A CN105371359 A CN 105371359A
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- 238000010257 thawing Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 5
- 238000001704 evaporation Methods 0.000 description 5
- 125000004122 cyclic group Chemical group 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
Abstract
The invention discloses an air conditioner. The air conditioner comprises an outdoor unit, an indoor unit, a four-way valve and a compressor which are connected through connecting pipes, and further comprises a first temperature sensor, a second temperature sensor and a controller. The first temperature sensor is arranged on the air inlet side of a heat exchanger of the outdoor unit. The second temperature sensor is arranged on the air outlet side of the heat exchanger of the outdoor unit. The input end of the controller is electrically connected with the first temperature sensor and the second temperature sensor. The output end of the controller is electrically connected with the four-way valve. When the time spent by the air conditioner on heating circulation is longer than a preset first time threshold value and the time duration during which the temperature difference between the air inlet temperature and the air outlet temperature is smaller than or equal to a preset temperature threshold value is larger than a second preset time threshold value, the controller controls valve openings of the four-way valve to be switched, and the air conditioner is switched into defrosting circulation from heating circulation. The invention further discloses a defrosting control method of the air conditioner. By means of the air conditioner and the defrosting control method of the air conditioner, defrosting can be effectively conducted in time, and the situation that defrosting is conducted when no frost exists is avoided.
Description
Technical field
The present invention relates to air-conditioning technical field, particularly relate to a kind of air-conditioner and air-conditioner defrosting control method.
Background technology
Air-conditioner is when heating, and off-premises station often understands frosting, and traditional Defrost method is by determining whether to enter defrosting mode to the coil temperature of outdoor unit heat exchanger.This Defrost method has certain defect: because the technology of air-conditioner is perfect not enough, and the temperature of coil pipe is subject to the impact of other factors a lot, the temperature of such as coil pipe is stressed, the impact of electronic expansion valve controls mode and manufacturing process, therefore, even if carry out repetition test under experimental conditions, still the situation of frostless defrost may be there is by air-conditioner when low temperature, again because air-conditioner enters the pattern of frostless defrost, to have a strong impact on the actual effect heated like this, the heat-production functions of air-conditioner reduces.
Summary of the invention
Main purpose of the present invention is the technical problem solving the frostless defrost when heating of existing air-conditioner.
For achieving the above object, the invention provides a kind of air-conditioner, described air-conditioner comprises the off-premises station connected by tube connector, indoor set, cross valve and compressor, also comprise the first temperature sensor for detecting described off-premises station EAT and for the second temperature sensor of detecting described off-premises station leaving air temp and controller, described first temperature sensor is arranged at the inlet side of the heat exchanger of described off-premises station, described second temperature sensor is arranged at the air side of the heat exchanger of described off-premises station, input described first temperature sensor of electrical connection of described controller and the second temperature sensor, the output of described controller is electrically connected described cross valve,
Default very first time threshold value is greater than when described air-conditioner is in the time heating circulation, and the duration that the temperature difference of described EAT and described leaving air temp is less than or equal to default temperature threshold is when being greater than the second default time threshold, the valve port that described controller controls described cross valve switches, and makes described air-conditioner proceed to defrost circulation by heating circulation.
Preferably, described very first time threshold value is the arbitrary value between 10 ~ 30 minutes, and described second time threshold is the arbitrary value between 3 ~ 8 minutes, and described temperature threshold is the arbitrary value at 0-10 degree.
Preferably, when the heat exchanger outlet temperature of described off-premises station is greater than 15 degree, the valve port that described controller controls described cross valve switches, and described air-conditioner is proceeded to by defrost circulation and heats circulation.
Preferably, when the heat exchanger outlet temperature of described off-premises station is greater than 8 degree, and when the duration is greater than 80 seconds, the valve port that described controller controls described cross valve switches, and described air-conditioner is proceeded to by defrost circulation and heats circulation.
Preferably, when the endurance period of defrost circulation was more than 10 minutes, the valve port that described controller controls described cross valve switches, and described air-conditioner is proceeded to by defrost circulation and heats circulation.
In addition, for achieving the above object, the present invention also provides a kind of air-conditioner defrosting control method, and described air-conditioner defrosting control method comprises the following steps:
Heat circulation time when air-conditioner is in, obtain the temperature difference of the time that heats of described air-conditioner, the off-premises station EAT of described air-conditioner, off-premises station leaving air temp and described EAT and leaving air temp;
Whether the time that heats described in judgement is greater than default very first time threshold value, and judges whether the duration that the described temperature difference is less than or equal to described default temperature threshold is greater than the second default time threshold;
When judge result be time, the valve port controlling the cross valve of described air-conditioner switches, make described air-conditioner by heat circulation proceed to defrost circulate.
Preferably, described very first time threshold value is the arbitrary value between 10 ~ 30 minutes, and described second time threshold is the arbitrary value between 3 ~ 8 minutes, and described temperature threshold is the arbitrary value at 0-10 degree.
Preferably, described when judge result be time, the valve port controlling the cross valve of described air-conditioner switches, make described air-conditioner by heat circulation proceed to defrost circulate step after also comprise:
Judge whether the heat exchanger outlet temperature of described off-premises station is greater than 15 degree;
When the heat exchanger outlet temperature of described off-premises station is greater than 15 degree, the valve port controlling described cross valve switches, and described air-conditioner is proceeded to by defrost circulation and heats circulation.
Preferably, described when judge result be time, the valve port controlling the cross valve of described air-conditioner switches, make described air-conditioner by heat circulation proceed to defrost circulate step after also comprise:
Judge whether the heat exchanger outlet temperature of described off-premises station is greater than 8 degree, and judge whether the duration that the heat exchanger outlet temperature of described off-premises station is greater than 8 degree is greater than 80 seconds;
If the result judged is when being, the valve port controlling described cross valve switches, and makes described air-conditioner be circulated to proceed to by defrost and heat circulation.
Preferably, also comprise:
Obtain the duration of described defrost circulation, when the endurance period that described defrost circulates was more than 10 minutes, the valve port controlling described cross valve switches, and described air-conditioner is proceeded to by defrost circulation and heats circulation.
A kind of air-conditioner of the present invention and air-conditioner defrosting control method, by judging the EAT of air-conditioner outdoor unit and the difference of leaving air temp, the situation of outdoor unit heat exchanger frosting may be there is when this difference diminishes, when the time that this difference is less than temperature threshold reaches the second time threshold, think that frosting has influence on the heating capacity of air-conditioner, at this moment air-conditioner is that defrost circulates by heating cyclic switching, the present invention is not owing to adopting the temperature of coil pipe to whether defrost judges, affect the pressure of coil temperature, the factors such as electronic expansion valve controls mode and air-conditioner manufacturing process are not in the limit of consideration of the present embodiment, therefore, it is possible to defrost timely and effectively, the situation of frostless defrost is avoided to occur.
Accompanying drawing explanation
Fig. 1 is the structural representation of air-conditioner one embodiment of the present invention.
Fig. 2 is the schematic flow sheet of air-conditioner defrosting control method first embodiment of the present invention;
Fig. 3 is the schematic flow sheet of air-conditioner defrosting control method second embodiment of the present invention;
Fig. 4 is the schematic flow sheet of air-conditioner defrosting control method the 3rd embodiment of the present invention;
Fig. 5 is the schematic flow sheet of air-conditioner defrosting control method the 4th embodiment of the present invention.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Detailed description of the invention
Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The invention provides a kind of air-conditioner, with reference to Fig. 1, in one embodiment, this air-conditioner comprises the off-premises station 1, indoor set (not shown), cross valve 2 and the compressor 3 that are connected by tube connector, also comprise the first temperature sensor 4, second temperature sensor 5, controller (not shown), first temperature sensor 4 is arranged at the inlet side of off-premises station 1, is specifically arranged at inlet side and is located on heat exchanger, for detecting off-premises station EAT; Second temperature sensor 5 is arranged at the air side of off-premises station 1, is specifically arranged at air side and is located on heat exchanger, for detecting off-premises station leaving air temp.The input of controller is electrically connected the first temperature sensor 4 and the second temperature sensor 5, the output electrical connection cross valve 2 of controller.
In the present embodiment, air-conditioner is when heating, the air inlet of cross valve 2 is communicated with evaporation mouth, gas outlet is communicated with condensate port, the cold-producing medium of the HTHP in compressor 3 is after air inlet with evaporation mouth, enter indoor set, after the cold-producing medium heat release of HTHP through electric expansion valve 6 laggard enter off-premises station 1, and then to get back in compressor 3 after condensate port and gas outlet.Be low-temp low-pressure during owing to getting back in off-premises station 1 after the cold-producing medium heat release of HTHP, therefore, easily make the heat exchanger frosting in off-premises station 1 or freeze, along with the aggravation of frosting, air quantity on heat exchanger is more and more less, causes heat exchange property worse and worse, and the heat-production functions of air-conditioner is greatly affected.
In the present embodiment, the heat exchanger of off-premises station 1 is positioned at air inlet the first temperature sensor 4 is set, obtain EAT Ta by the first temperature sensor 4 induction; Be positioned at air outlet place at the opposite side of heat exchanger and the second temperature sensor 5 is set, obtain leaving air temp Tb by the second temperature sensor 5 induction.In the present embodiment, EAT can think outdoor environment temperature, and this temperature is substantially constant, or change is little, and leaving air temp is change.The present embodiment take EAT as benchmark, judges the heating capacity of air-conditioner.
In the present embodiment, preset a temperature threshold, this temperature threshold is priori value.Air-conditioner is when heating, start the first temperature sensor 4, second temperature sensor 5 and controller, when air-conditioner stablize the time heated be greater than the default very first time threshold value time, such as stablize after heating 20 minutes, controller obtains EAT Ta and leaving air temp Tb, the difference DELTA T (Δ T=Ta-Tb) of EAT Ta and leaving air temp Tb is compared with this temperature threshold, if the time that difference DELTA T is less than temperature threshold is when reaching the second time threshold, during as reached 5 minutes, air-conditioner carries out defrost, and will heat cyclic switching is defrost circulation.
In the present embodiment, very first time threshold value is the arbitrary value between 10 ~ 30 minutes, second time threshold is the arbitrary value between 3 ~ 8 minutes, and temperature threshold is the arbitrary value at 0-10 degree, and very first time threshold value, the second time threshold and temperature threshold specifically can set according to actual conditions.
Particularly, when frosting appears in off-premises station 1 heat exchanger, along with the aggravation of frosting, leaving air temp Tb can become large, and EAT is substantially constant or change is less, causes difference DELTA T to diminish like this.When the time that difference DELTA T is less than temperature threshold reaches the second time threshold, controller sends a switching command to cross valve 2, cross valve 2 carries out the switching of valve port according to this switching command, namely cut off air inlet and evaporate mouth, cut off gas outlet and condensate port, then connect air inlet and condensate port, connect gas outlet and evaporation mouth.
In the present embodiment, when the full frost of off-premises station 1 heat exchanger knot, air-conditioner can not heat, and at this moment difference DELTA T is almost 0.
In the present embodiment, after cross valve 2 carries out the switching of valve port according to this switching command, air-conditioner transfers defrost circulation to by the current circulation that heats, and the cold-producing medium of the HTHP in compressor 3 is after air inlet and condensate port, directly enter in off-premises station, defrost can be carried out to the heat exchanger in off-premises station.Now, air-conditioner no longer heats.After defrost terminates, air-conditioner is circulated to transfer to by defrost and heats circulation, continues to heat.
Particularly, can obtain the outlet temperature in the exit of the heat exchanger coil of off-premises station, when this outlet temperature is greater than 15 degree, the valve port that controller controls cross valve switches, and air-conditioner is proceeded to by defrost circulation and heats circulation; Or
When outlet temperature is greater than 8 degree, and when the duration is greater than 80 seconds, the valve port that controller controls cross valve switches, and air-conditioner is proceeded to by defrost circulation and heats circulation; Or
When defrost cycle endurance period was more than 10 minutes, the valve port that controller controls cross valve switches, and air-conditioner is proceeded to by defrost circulation and heats circulation.
Compared with prior art, the present embodiment is by judging the EAT of air-conditioner outdoor unit and the difference of leaving air temp, the situation of outdoor unit heat exchanger frosting may be there is when this difference diminishes, when the time that this difference is less than temperature threshold reaches the second time threshold, think that frosting has influence on the heating capacity of air-conditioner, at this moment air-conditioner is that defrost circulates by heating cyclic switching, the present embodiment is not owing to adopting the temperature of coil pipe to whether defrost judges, affect the pressure of coil temperature, the factors such as electronic expansion valve controls mode and air-conditioner manufacturing process are not in the limit of consideration of the present embodiment, therefore, it is possible to defrost timely and effectively, the situation of frostless defrost is avoided to occur.
The present invention also provides a kind of air-conditioner defrosting control method, and in one embodiment, this air-conditioner defrosting control method comprises:
Step S101, heats circulation time when air-conditioner is in, and obtains the temperature difference of the time that heats of described air-conditioner, the off-premises station EAT of described air-conditioner, off-premises station leaving air temp and described EAT and leaving air temp;
In the present embodiment, when air conditioner heat-production, start and be arranged at the first temperature sensor of the air inlet of the off-premises station of air-conditioner, the second temperature sensor being arranged at the air outlet place of the off-premises station of air-conditioner and controller.Obtain EAT by the first temperature sensor, and obtain leaving air temp by the second temperature sensor, EAT and leaving air temp are sent to controller, obtained the temperature difference of EAT and leaving air temp by controller.
Step S102, whether the time that heats described in judgement is greater than default very first time threshold value, and judges whether the duration that the described temperature difference is less than or equal to described default temperature threshold is greater than the second default time threshold;
Step S103, when judge result be time, the valve port controlling the cross valve of described air-conditioner switches, make described air-conditioner by heat circulation proceed to defrost circulate.
In the present embodiment, preset a temperature threshold, this temperature threshold is priori value.When air-conditioner is stablized after the time heated is greater than very first time threshold value, such as stablize after heating 20 minutes, controller obtains EAT Ta and leaving air temp Tb, the difference DELTA T (Δ T=Ta-Tb) of EAT Ta and leaving air temp Tb is compared with this temperature threshold, if the time that difference DELTA T is less than temperature threshold is when reaching the second time threshold, during as reached 5 minutes, air-conditioner carries out defrost, and will heat cyclic switching is defrost circulation.
In the present embodiment, very first time threshold value is the arbitrary value between 10 ~ 30 minutes, second time threshold is the arbitrary value between 3 ~ 8 minutes, and temperature threshold is the arbitrary value at 0-10 degree, and very first time threshold value, the second time threshold and temperature threshold specifically can set according to actual conditions.
Particularly, when frosting appears in outdoor unit heat exchanger, along with the aggravation of frosting, leaving air temp Tb can become large, and EAT is substantially constant or change is less, causes difference DELTA T to diminish like this.When the time that difference DELTA T is less than temperature threshold reaches the second time threshold, controller sends the first switching command to cross valve, cross valve carries out the switching of valve port according to this switching command, namely cut off air inlet and evaporate mouth, cut off gas outlet and condensate port, then connect air inlet and condensate port, connect gas outlet and evaporation mouth.
In the present embodiment, when the full frost of outdoor unit heat exchanger knot, air-conditioner can not heat, and at this moment difference DELTA T is almost 0.
In the present embodiment, after cross valve carries out the switching of valve port according to this first switching command, air-conditioner transfers defrost circulation to by the current circulation that heats, the cold-producing medium of the HTHP in compressor is after air inlet and condensate port, directly enter in off-premises station, defrost can be carried out to the heat exchanger in off-premises station.Now, air-conditioner no longer heats.
In a preferred embodiment, as shown in Figure 3, on the basis of the embodiment of above-mentioned Fig. 2, the present embodiment comprises:
Step S201, heats circulation time when air-conditioner is in, and obtains the temperature difference of the time that heats of described air-conditioner, the off-premises station EAT of described air-conditioner, off-premises station leaving air temp and described EAT and leaving air temp;
Step S202, whether the time that heats described in judgement is greater than default very first time threshold value, if so, then enters step S203, otherwise enters step S205;
Step S203, judges whether the duration that the described temperature difference is less than or equal to described default temperature threshold is greater than the second default time threshold; If so, then enter step S204, otherwise enter as step S205;
Step S204, the valve port controlling the cross valve of described air-conditioner switches, and makes described air-conditioner proceed to defrost circulation by heating circulation;
Step S205, keeps heating circulation;
Step S206, judges whether the heat exchanger outlet temperature of described off-premises station is greater than 15 degree; If so, then enter step S207, otherwise enter step S208;
Step S207, the valve port controlling described cross valve switches, and described air-conditioner is proceeded to by defrost circulation and heats circulation;
Step S208, keeps defrost circulation.
In the present embodiment, by heat circulation proceed to defrost circulate after, need to detect the state of defrost, in one embodiment, the outlet temperature in the exit of the heat exchanger coil of off-premises station can be obtained, detected the effect whether reaching defrost by heat exchanger of outdoor unit outlet temperature, particularly, if leaving air temp is comparatively large, namely defrost can be carried out to the part of off-premises station frosting.In the present embodiment, controller sends the second switching command to cross valve, and be again communicated with air inlet and evaporation mouth, be communicated with gas outlet and condensate port, air-conditioner recovers to heat.
In a preferred embodiment, as shown in Figure 4, on the basis of the embodiment of above-mentioned Fig. 3, the present embodiment also comprises after step s 204:
Step S209, judges whether the heat exchanger outlet temperature of described off-premises station is greater than 8 degree; If so, then step S210 is entered, otherwise, enter step S212;
Step S210, judges whether the duration that the heat exchanger outlet temperature of described off-premises station is greater than 8 degree is greater than 80 seconds; If so, then enter step S211, otherwise enter step S212;
Step S211, the valve port controlling described cross valve switches, and described air-conditioner is proceeded to by defrost circulation and heats circulation;
Step S212, keeps defrost circulation.
The present embodiment carries out detection to the state of defrost: the outlet temperature obtaining the exit of the heat exchanger coil of off-premises station, judge whether the heat exchanger outlet temperature of off-premises station is greater than 8 degree, and judge whether the duration that the heat exchanger outlet temperature of off-premises station is greater than 8 degree is greater than 80 seconds, if all satisfied condition, then think and then control the effect having reached defrost air-conditioner and recover to heat.
In a preferred embodiment, as shown in Figure 5, on the basis of the embodiment of above-mentioned Fig. 3, the present embodiment also comprises after step s 204:
Step S213, judges that whether endurance period that defrost circulates is more than 10 minutes, if so, then enters step S214, otherwise enters as step S215.
Step S214, the valve port controlling described cross valve switches, and described air-conditioner is proceeded to by defrost circulation and heats circulation;
Step S215, keeps defrost circulation.
The present embodiment carries out detection to the state of defrost: when the endurance period of defrost circulation was more than 10 minutes, then think and then control the effect having reached defrost air-conditioner and recover to heat.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize description of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. an air-conditioner, described air-conditioner comprises the off-premises station, indoor set, cross valve and the compressor that are connected by tube connector, it is characterized in that,
Also comprise the first temperature sensor for detecting described off-premises station EAT and for the second temperature sensor of detecting described off-premises station leaving air temp and controller, described first temperature sensor is arranged at the inlet side of the heat exchanger of described off-premises station, described second temperature sensor is arranged at the air side of the heat exchanger of described off-premises station, input described first temperature sensor of electrical connection of described controller and the second temperature sensor, the output of described controller is electrically connected described cross valve;
Default very first time threshold value is greater than when described air-conditioner is in the time heating circulation, and the duration that the temperature difference of described EAT and described leaving air temp is less than or equal to default temperature threshold is when being greater than the second default time threshold, the valve port that described controller controls described cross valve switches, and makes described air-conditioner proceed to defrost circulation by heating circulation.
2. air-conditioner as claimed in claim 1, it is characterized in that, described very first time threshold value is the arbitrary value between 10 ~ 30 minutes, and described second time threshold is the arbitrary value between 3 ~ 8 minutes, and described temperature threshold is the arbitrary value at 0-10 degree.
3. air-conditioner as claimed in claim 1 or 2, it is characterized in that, when the heat exchanger outlet temperature of described off-premises station is greater than 15 degree, the valve port that described controller controls described cross valve switches, and described air-conditioner is proceeded to by defrost circulation and heats circulation.
4. air-conditioner as claimed in claim 1 or 2, it is characterized in that, when the heat exchanger outlet temperature of described off-premises station is greater than 8 degree, and when the duration is greater than 80 seconds, the valve port that described controller controls described cross valve switches, and described air-conditioner is proceeded to by defrost circulation and heats circulation.
5. air-conditioner as claimed in claim 1 or 2, is characterized in that, when the endurance period of defrost circulation was more than 10 minutes, the valve port that described controller controls described cross valve switches, and described air-conditioner is proceeded to by defrost circulation and heats circulation.
6. an air-conditioner defrosting control method, is characterized in that, described air-conditioner defrosting control method comprises the following steps:
Heat circulation time when air-conditioner is in, obtain the temperature difference of the time that heats of described air-conditioner, the off-premises station EAT of described air-conditioner, off-premises station leaving air temp and described EAT and leaving air temp;
Whether the time that heats described in judgement is greater than default very first time threshold value, and judges whether the duration that the described temperature difference is less than or equal to described default temperature threshold is greater than the second default time threshold;
When judge result be time, the valve port controlling the cross valve of described air-conditioner switches, make described air-conditioner by heat circulation proceed to defrost circulate.
7. air-conditioner defrosting control method as claimed in claim 6, it is characterized in that, described very first time threshold value is the arbitrary value between 10 ~ 30 minutes, and described second time threshold is the arbitrary value between 3 ~ 8 minutes, and described temperature threshold is the arbitrary value at 0-10 degree.
8. air-conditioner defrosting control method as claimed in claims 6 or 7, it is characterized in that, described when judge result be time, the valve port controlling the cross valve of described air-conditioner switches, make described air-conditioner by heat circulation proceed to defrost circulate step after also comprise:
Judge whether the heat exchanger outlet temperature of described off-premises station is greater than 15 degree;
When the heat exchanger outlet temperature of described off-premises station is greater than 15 degree, the valve port controlling described cross valve switches, and described air-conditioner is proceeded to by defrost circulation and heats circulation.
9. air-conditioner defrosting control method as claimed in claims 6 or 7, it is characterized in that, described when judge result be time, the valve port controlling the cross valve of described air-conditioner switches, make described air-conditioner by heat circulation proceed to defrost circulate step after also comprise:
Judge whether the heat exchanger outlet temperature of described off-premises station is greater than 8 degree, and judge whether the duration that the heat exchanger outlet temperature of described off-premises station is greater than 8 degree is greater than 80 seconds;
If the result judged is when being, the valve port controlling described cross valve switches, and makes described air-conditioner be circulated to proceed to by defrost and heat circulation.
10. the air-conditioner defrosting control method as described in claim 6 to 7, is characterized in that, also comprise:
Obtain the duration of described defrost circulation, when the endurance period that described defrost circulates was more than 10 minutes, the valve port controlling described cross valve switches, and described air-conditioner is proceeded to by defrost circulation and heats circulation.
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| CN201410440901.2A CN105371359A (en) | 2014-09-01 | 2014-09-01 | Air conditioner and defrosting control method of air conditioner |
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| CN201410440901.2A CN105371359A (en) | 2014-09-01 | 2014-09-01 | Air conditioner and defrosting control method of air conditioner |
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