CN101876474A - Method for automatically detecting lack of refrigerant in air-conditioner - Google Patents
Method for automatically detecting lack of refrigerant in air-conditioner Download PDFInfo
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Abstract
The invention relates to an air-conditioner, in particular to a method for automatically detecting the lack of refrigerant in the air-conditioner. The invention discloses a method for automatically detecting the lack of refrigerant in the air-conditioner in order to solve the problems that the prior art can not automatically detect the fault of the lack of refrigerant or give an alarm to result in high maintenance cost and low maintenance efficiency. The automatic detecting method comprises the following steps of: detecting the difference between the indoor temperature and the temperature of an inner coiled tube, the difference between the outdoor temperature and the temperature of an outer coiled tube and the running current value of a compressor at real time after the air-conditioner runs; and compared with the normal conditions, judging whether the large deviation exists or not so as to judge whether the present refrigerant lacks or not. The invention has the advantages of automatically detecting the fault of the lack of refrigerant in the air-conditioner, immediately giving an alarm, reminding users of the associated maintenance, reducing the maintenance cost and improving the efficiency; and the invention is suitable for detecting whether the air-conditioner lacks of refrigerant or not.
Description
Technical field
The present invention relates to air-conditioner, relate to a kind of automatic testing method of lack of refrigerant in air-conditioner specifically.
Background technology
For air-conditioner, joint such as copper pipe arrangement connects badly when installing, or condenser, evaporimeter, copper pipe arrangement use the back tiny breaking to occur and make cold-producing medium leak, and will cause freezing, heating effect is very poor.But present air-conditioner system occurs can not carrying out fault alarm automatically when unusual, and the user can not understand the problem of appearance.The maintenance personal needs earlier understanding problem to the doorstep, returns and gets relevant maintenance tool, and dealing several times could be good with air-conditioner repair repeatedly.Increased maintenance cost, maintenance efficiency is low.
Summary of the invention
Technical problem to be solved by this invention is: propose a kind of automatic testing method of lack of refrigerant in air-conditioner, solving conventional art can not be to lacking the automatic detection alarm of cold-producing medium fault, causes maintenance cost height, problem that maintenance efficiency is low.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: the automatic testing method of lack of refrigerant in air-conditioner may further comprise the steps:
A. after air-conditioner brings into operation, detect indoor temperature, outdoor temperature, indoor condenser coil temperature, outdoor evaporator coil temperature and compressor operating current value in real time;
B. judge current conditioners running conditions, if be refrigerating state then execution in step c, if for the state of heating then execution in step d;
C. after the compressor operating T1 time, if Ta-Tb＜A then transfers to lowest speed with air conditioner chamber's internal fan speed, rerun T2 after the time, if Ta-Tb＜B and Td-Tc＜C, and the compressor operating electric current that detect this moment is lower than I1, then execution in step e;
D. after the compressor operating T3 time, if Tb-Ta＜X then transfers to lowest speed with air conditioning chamber's internal fan speed, rerun T4 after the time, if Tb-Ta＜Y and Tc-Td＜Z, and the compressor operating electric current that detect this moment is lower than I2, then execution in step e;
E. air-conditioner is shut down, and points out the current cold-producing medium that lacks;
Described Ta is an indoor temperature, and Tb is indoor condenser coil temperature, and Tc is an outdoor temperature, and Td is outdoor evaporator coil temperature, and I1 is the compressor operating current threshold under the air-conditioner refrigerating state, and I2 is the compressor operating current threshold under the air conditioner heat-production state.
Further, described T1=3～8 minute, T2=3～8 minute, A=2～5 ℃, B=2～4 ℃, C=1～2 ℃, I1=2A; Described T3=4～9 minute, T4=4～9 minute, X=3～5 ℃, Y=3～5 ℃, Z=2～3 ℃, I2=2.5A.
The invention has the beneficial effects as follows: detect the fault of lack of refrigerant in air-conditioner automatically, in time report to the police, remind user's maintenance of be correlated with, the reduction maintenance cost is raised the efficiency.
The specific embodiment
The invention will be further described below in conjunction with embodiment.
The present invention is directed to conventional art can not be to lacking the automatic detection alarm of cold-producing medium fault, causes maintenance cost height, problem that maintenance efficiency is low, has proposed a kind of automatic testing method of lack of refrigerant in air-conditioner.Its cardinal principle is: air-conditioning is when refrigeration, need to take to indoor heat outdoor by air-conditioning system, carry out heat exchange with indoor, outdoor air respectively by evaporimeter and condenser, the temperature difference of the temperature difference, outdoor temperature and the outer coil pipe of indoor temperature and inner coil pipe certainly will be formed like this, just effective heat exchange can be carried out.Generally speaking, air-conditioning system is added the cold-producing medium of notes in a normal value range, after air-conditioning brings into operation certain hour, and the temperature difference of the temperature difference of indoor temperature and inner coil pipe, outdoor temperature and outer coil pipe; The compressor operating current value has a normal scope.
Cold-producing medium in air-conditioning system leaks, run up to a certain degree after, the temperature difference of the indoor temperature of air-conditioning and the temperature difference of inner coil pipe, outdoor temperature and outer coil pipe and compressor operating current value will depart from above-mentioned normal range value greatly.Therefore by relatively and indoor temperature, inner coil pipe, outdoor temperature, outer coil pipe, the isoparametric situation of change of compressor operating electric current of judging air-conditioning just can detect air-conditioning and whether lack cold-producing medium.For the state that heats of air-conditioner, principle is identical, and just the flow direction of heat is opposite, to sum up, after the air-conditioner operation, by real-time detection relevant parameter, and contrasts with normal condition, just can judge the current cold-producing medium that whether lacks.
Embodiment:
Cold-producing medium described in this example is example with R22, and air-conditioner is the air-conditioner of 1P power, and concrete detection method is as follows:
A. after air-conditioner brings into operation, detect indoor temperature (Ta), outdoor temperature (Tc), indoor condenser coil temperature (Tb), outdoor evaporator coil temperature (Td) and compressor operating current value in real time;
B. judge current conditioners running conditions, if be refrigerating state then execution in step c, if for the state of heating then execution in step d;
C. at compressor operating after 3～8 minutes; if Ta-Tb＜2～5 ℃; then air conditioner chamber's internal fan speed is transferred to lowest speed; after reruning 3～8 minutes; if Ta-Tb＜2～4 ℃ and Td-Tc＜1～2 ℃; and the compressor operating electric current that detect this moment is lower than 2A, then compressor and outdoor fan shutdown is protected system.Unusually reach this failure code by the display screen display system, remind the user to keep in repair accordingly.
D. at compressor operating after 4～9 minutes; if Tb-Ta＜3～5 ℃; then air conditioning chamber's internal fan speed is transferred to lowest speed; after T4 minute; if Tb-Ta＜3～5 ℃ and Tc-Td＜2～3 ℃; and the compressor operating electric current that detect this moment is lower than 2.5A, then compressor and outdoor fan shutdown is protected system.Unusually reach this failure code by the display screen display system, remind the user to keep in repair accordingly.
Number range in the foregoing description all is the empirical values that draw by long term test, and because cold-producing medium is of a great variety, except R22 also has R410A, R407 etc., air-conditioner also has multiple models such as 1.5P, 2P, 3P except 1P power, the air-conditioner of different capacity can be slightly different with the pairing parameter area of different cold-producing mediums; Moreover the series of values scope in the foregoing description is based on the testing result that cold-producing medium draws under the situation of fewer than half weight, and what of residual refrigerant also can influence number range.To sum up, the present invention comprises but is not limited only to the foregoing description, and those skilled in the art changes the technique effect that reaches same slightly according to such scheme easily, and it all belongs to protection scope of the present invention.
Claims (2)
1. the automatic testing method of lack of refrigerant in air-conditioner is characterized in that: may further comprise the steps:
A. after air-conditioner brings into operation, detect indoor temperature, outdoor temperature, indoor condenser coil temperature, outdoor evaporator coil temperature and compressor operating current value in real time;
B. judge current conditioners running conditions, if be refrigerating state then execution in step c, if for the state of heating then execution in step d;
C. after the compressor operating T1 time, if Ta-Tb＜A then transfers to lowest speed with air conditioner chamber's internal fan speed, rerun T2 after the time, if Ta-Tb＜B and Td-Tc＜C, and the compressor operating electric current that detect this moment is lower than I1, then execution in step e;
D. after the compressor operating T3 time, if Tb-Ta＜X then transfers to lowest speed with air conditioning chamber's internal fan speed, rerun T4 after the time, if Tb-Ta＜Y and Tc-Td＜Z, and the compressor operating electric current that detect this moment is lower than I2, then execution in step e;
E. air-conditioner is shut down, and points out the current cold-producing medium that lacks;
Described Ta is an indoor temperature, and Tb is indoor condenser coil temperature, and Tc is an outdoor temperature, and Td is outdoor evaporator coil temperature, and I1 is the compressor operating current threshold under the air-conditioner refrigerating state, and I2 is the compressor operating current threshold under the air conditioner heat-production state.
2. the automatic testing method of lack of refrigerant in air-conditioner as claimed in claim 1 is characterized in that: described T1=3～8 minute, T2=3～8 minute, A=2～5 ℃, B=2～4 ℃, C=1～2 ℃, I1=2A; Described T3=4～9 minute, T4=4～9 minute, X=3～5 ℃, Y=3～5 ℃, Z=2～3 ℃, I2=2.5A.
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