CN102679685A - Air-cooled refrigerator and energy-saving defrosting control method thereof - Google Patents
Air-cooled refrigerator and energy-saving defrosting control method thereof Download PDFInfo
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- CN102679685A CN102679685A CN2012101397654A CN201210139765A CN102679685A CN 102679685 A CN102679685 A CN 102679685A CN 2012101397654 A CN2012101397654 A CN 2012101397654A CN 201210139765 A CN201210139765 A CN 201210139765A CN 102679685 A CN102679685 A CN 102679685A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
- F25D21/08—Removing frost by electric heating
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Abstract
The invention discloses an air-cooled refrigerator which comprises a refrigeration system, an electrical control device, a sensing device and an air duct system, wherein the sensing device comprises a refrigerating chamber temperature sensor, a freezing chamber temperature sensor and an evaporator temperature sensor; and a timing part arranged in the electrical control device comprises a compressor operation timer, a defrosting pre-preparation timer, an air return defrosting timer and an electrical-heated defrosting timer. The invention also provides an energy-saving defrosting control method of the air-cooled refrigerator. The energy-saving defrosting control method comprises the following steps of: entering a defrosting program; performing defrosting pre-preparation; performing air return defrosting; performing electrical-heated defrosting; and finishing defrosting. According to the air-cooled refrigerator and the air return defrosting control method thereof provided by the invention, signals of each sensor can be received by the electrical control device, the state of each timer can be monitored, fine control over a compressor, a fan and the like can be realized, over-high temperature of a refrigerating chamber, caused by air return defrosting, is prevented, a preservation effect of the refrigerator is reduced, and meanwhile, a closed-loop type poor working process is prevented.
Description
Technical field
The present invention relates to a kind of wind cooling refrigerator and energy-conservation defrosting control method thereof, especially utilize the control method of return air defrost.
Background technology
Frost-free refrigerator is called indirect cooling refrigerator or wind cooling refrigerator again, utilizes fan to make cold wind forced convection circulation and refrigeration, frozen food indirectly.
Structurally; Existing wind cooling refrigerator comprises refrigeration system, electric control gear, air channel, built-in blower fan, refrigerating chamber, refrigerating chamber, refrigerator temperature sensor, the freezer temperature sensor in air channel, and refrigeration system comprises compressor outlet, condenser, throttling arrangement (capillary, choke valve etc.), evaporimeter, the compressor inlet that is connected in turn through refrigerant tubing.The signal of electric control gear receiving sensor, and the start and stop of control compressor, blower fan etc.Be provided with the timing part in the electric control gear,, be used for monitoring the various time limits like compressor operating timer, defrost timer or the like.Existing wind cooling refrigerator generally all is preset with return air defrost maximum time t (being called basic defrost time t2 among the present invention), when the defrost time surpasses this setting-up time, forces to stop the return air defrost.In use, the user can set the temperature of refrigerating chamber and the temperature of refrigerating chamber.
The interior moisture evaporated of wind cooling refrigerator is taken away by cold wind during work, and through evaporimeter the time, freezes to form white layer in the surface of evaporimeter.Frost-free refrigerator has its advantage: refrigeration is than very fast; But its fatal shortcoming is also arranged simultaneously: the blowing that does not stop causes the dry phenomenon of foodstuff surface easily, and needs regularly to pass through electric heater to the evaporimeter defrost, and power consumption is than higher.
In addition, the moisture that is pulled away of wind cooling refrigerator freezes to form the frost layer in evaporator surface through evaporimeter the time.The existence of frost layer will have influence on refrigeration performance, even block the circulation of air, need carry out defrost to evaporimeter.
The frost-free refrigerator defrosting method mainly contains four kinds: 1) utilize the temperature value of evaporator ventilating air to start defrost process; 2) frost sensor is set or adopts white tomographic image treatment technology at a certain concrete measurement point, the judgement frost thickness is controlled defrost; 3) use fuzzy reasoning, reach the most stable time,, carry out quick defrost even frost thickness is little at refrigerator temperature; 4) reach a certain numerical value, the set time defrost according to compressor accumulated running time.
Chinese patent CN200820021415.7 discloses a kind of wind cooling refrigerator, and its refrigerating chamber blower fan adopts two-way blower fan, and after temperature of refrigerating chamber rose to design temperature, the refrigerating chamber blower fan began reversing, and evaporimeter defrost water vapour blowback refrigerating chamber is inner.This wind cooling refrigerator when utilizing the higher gas of temperature of refrigerating chamber for the evaporimeter defrost, make after the defrost than the cold air blowback to refrigerating chamber, for the refrigerating chamber cooling, realize certain energy-saving effect.
Chinese patent 200810219904.8 discloses a kind of refrigerating chamber cycling hot and has utilized defrosting refrigeration system, can utilize the recyclegas in the refrigerating chamber process of refrigerastion that evaporimeter is carried out defrost, thus the energy consumption of electric heater when having reduced the refrigerator defrost.
Above-mentioned refrigerator has following defective: 1. when using the interior gas of refrigerating chamber as the evaporimeter defrost, the cold air in blowback to the refrigerating chamber has satisfied not the demand of refrigerating chamber to cold air, but does not have relative measures to prevent that temperature of refrigerating chamber is too high; When the relative refrigerating chamber of refrigerating chamber was big, after the temperature of refrigerating chamber reached requirement, the temperature of refrigerating chamber did not often reach requirement.This defective causes the fresh-keeping effect of refrigerator to descend.In the bigger refrigerator of the relative refrigerating chamber of refrigerating chamber, above-mentioned defective is more obvious.
2. the bad course of work of following endless loop formula might take place this refrigerator at work: evaporimeter frost layer is too thick, so that heat exchange efficiency is too low, causes the refrigerator continuous operation still can not freezer temperature be pulled down to setting value, thereby can't start the defrost program; Owing to can't start the defrost program, evaporimeter frost layer will be long-pending more thick more, cause heat exchange efficiency further to reduce, freezer temperature can not be reached all the time trigger defrost required than low value.
3. start-stop is bigger than more, and the frost layer is thick relatively more; Air humidity is big more, and the frost layer is thick relatively more; Environment temperature is high more, and the frost layer is thick relatively more.If can be according to the variation adjustment rotation speed of fan of above-mentioned situation, the actual condition in the time of then can making rotation speed of fan as far as possible with defrosting adapts.The adjusting but the present wind cooling refrigerator that does not have to occur adjusting according to the change dynamics of above-mentioned three kinds of factors rotation speed of fan, promptly existing wind cooling refrigerator can not become more meticulous to the operation of refrigerator.
Term explanation: " shutoff temperature " shutdown temperature point of compressor when being meant normal operation in the art, generally than low 1 ~ 2 degree of design temperature.Design temperature refers to the temperature value that the refrigerator user sets, down together.
" start-stop than "=compressor the available machine time/(downtime of the available machine time+compressor of compressor).
Summary of the invention
The object of the present invention is to provide a kind of wind cooling refrigerator that can carry out meticulous adjusting to defrost process, strengthen the fresh-keeping effect of refrigerator.
The present invention also aims to provide a kind of energy-conservation defrosting control method of above-mentioned wind cooling refrigerator; Can be to the refrigerator defrost adjusting that becomes more meticulous; When utilizing return air defrost realization energy-conservation, guarantee the demand of refrigerating chamber, avoid the bad course of work of above-mentioned endless loop formula simultaneously cold.
For realizing above-mentioned first kind of purpose, wind cooling refrigerator of the present invention comprises refrigeration system, electric control gear, sensing device, refrigerating chamber, refrigerating chamber and ducting system; Sensing device is connected with electric control gear, and said ducting system comprises blower fan and the refrigerating chamber air door that is provided with in air channel, this air channel; Said sensing device comprises refrigerator temperature sensor, freezer temperature sensor and evaporator temperature sensor; Be provided with the timing part in the said electric control gear, timing is prepared timer, return air defrost timer and electrical heating defrost timer before partly comprising compressor operating timer, defrost.
The concrete setting of sensing device and timing part; Make electric control gear can receive each sensor signal (temperature that particularly when the return air defrost, can monitor evaporimeter is to implement control corresponding), monitor the state of each timer; And realize the control that becomes more meticulous in view of the above to compressor, blower fan etc.; Prevent that the return air defrost from causing temperature of refrigerating chamber too high, reduce the fresh-keeping effect of refrigerator, prevent the bad course of work of the formula of endless loop described in the background technology simultaneously.
Said refrigerating chamber air door is arranged on the refrigerating chamber top; Said return air inlet is arranged on the bottom of refrigerating chamber; So that supply air-flow circulation (sending cold) pattern of formula next time in the formation, utilize cold airflow proportion principle big, that sink naturally to promote gas flow in the refrigerating chamber, quicken the temperature-fall period of refrigerating chamber.
Said refrigerator temperature sensor is arranged on the bottom of refrigerating chamber, and said freezer temperature sensor is arranged on the bottom of refrigerating chamber.
For realizing above-mentioned second kind of goal of the invention; The technical scheme of the energy-conservation defrosting control method of wind cooling refrigerator of the present invention is: in a defrost periods; The time that the preceding preparatory stage of defrost that on behalf of the preceding preparation of defrost timer, T1 add up is experienced; The time that the return air defrost stage that on behalf of return air defrost timer, T2 added up is experienced; The time that the electrical heating defrost stage that on behalf of electrical heating defrost timer, T3 added up is experienced, the time that the compressor accumulative total that on behalf of the compressor operating timer, T4 added up is moved; This control method in turn includes the following steps: one, first step is the value of the T4 that added up of electric control gear inspection compressor operating timer, hour then gets into second step like T4 >=7.5, hour then makes refrigerator keep normal refrigerating operaton state like T4＜7.5; Two, second step is a preparation before the defrost, comprises following substep successively: first substep is to prepare timer before the defrost to pick up counting; Second substep comprises the refrigerating chamber control route and the refrigerating chamber control route of operation simultaneously, and the condition of jumping out of second substep comprises C condition and D condition; The C condition is refrigerating chamber sensor temperature F1＜shutoff temperature-2 ℃; The D condition is T1 >=70 minute; Control in the running of route at refrigerating chamber control route and refrigerating chamber, when C or D satisfy when arbitrary at least, electric control gear is carried out the action of jumping out of second step;
The initial actuating of refrigerating chamber control route is the temperature R1 of electric control gear inspection refrigerator temperature sensor, and as R1＜design temperature+t1 ℃, then the closing cold room air door is to stop to refrigerating chamber supply cold wind; Otherwise open the refrigerating chamber air door, refrigerating chamber is freezed; The value of electric control gear inspection T1 in the process of refrigerastion, as T1>=70 minute then electric control gear control refrigerator carry out the action of jumping out of second step; Like T1＜70 minute, then return back to the initial actuating of refrigerating chamber control route; Wherein, the span of parametric t 1 is 5 ± 2; The initial actuating of refrigerating chamber control route is the temperature F1 of electric control gear inspection freezer temperature sensor, satisfies like the C condition, and then electric control gear control refrigerator is carried out the action of jumping out of second step; Like F1>=shutoff temperature-2 ℃, then electric control gear continues the value of inspection T1, satisfies the action of jumping out that electric control gear control refrigerator is then carried out second step like the D condition; Like T1＜70 minute, then return back to the initial actuating of refrigerating chamber control route; The action of jumping out of second substep is that electric control gear is prepared the timer zero clearing before with defrost; Third step is the return air defrost, and this step comprises following substep: first substep is the electric control gear close compressor, starts blower fan, opens the refrigerating chamber air door, gets into the 3rd substep then; Second substep is that electric control gear control return air defrost timer picks up counting or continues timing, prepares the timer zero clearing before the defrost, second step finishes this substep of back and carries out simultaneously with first substep; When being finished to change this substep over to by second step, return air defrost timer picks up counting; When returning this substep by the 3rd substep redirect, return air defrost timer continues timing; The 3rd substep is whether the timing of electric control gear detection return air defrost timer finishes; Being the preset value t2 whether T2 reaches the return air defrost time, is then to get into the 4th substep, whether is lower than 0 degree otherwise detect temperature of refrigerating chamber R1; Like temperature of refrigerating chamber R1≤0 degree; Then get into the 4th substep, like temperature of refrigerating chamber R1＞0 degree, then electric control gear control refrigerator returns and carries out second substep; The 4th substep is that electric control gear stops compressor, closes blower fan and refrigerating chamber air door, finishes return air defrost step; The 4th step is an electrical heating defrost step, and this steps in sequence comprises following substep: first substep is that opening electric heater carries out the electrical heating defrost, starts electrical heating defrost timer simultaneously and carries out timing; With continuous 11 defrosts is one-period; Preceding 10 defrost times all are set at and are no more than 25 minutes in each cycle; Electric control gear cuts out electric heater when being T3＞25 minute; The 11st defrost time set be for being no more than 40 minutes in period 1, and promptly electric control gear cuts out electric heater during T3＞40 minute; Second substep is when continuing to carry out the electrical heating defrost; Electric control gear detects the value H1 of defrosting sensor; Detect electrical heating defrost timer T3 timing simultaneously and whether reach said setting value, when H1＞6 or T3＞above-mentioned setting value, get into the 5th step; When H1≤6 and electrical heating defrost timer T3≤said setting value, carry out this substep again; The 5th step is the zero clearing of defrost timer and picks up counting again that the epicycle defrost periods finishes.
The energy-conservation defrosting control method of above-mentioned wind cooling refrigerator has following beneficial effect: the beneficial effect that (1) C, D condition are brought: normal condition be the refrigerator continuous operation less than 70 minutes, the C condition is promptly satisfied; Exception is that frost layer is too thick, so that heat exchange efficiency is too low, causes also unmet of 70 minutes C conditions of refrigerator continuous operation.The temperature of refrigerating chamber was enough low when the C condition can guarantee as a rule that defrost begins, so that the temperature of refrigerating chamber remains within the normal range (NR) in the return air defrost process, and can be not too high.All freezer temperature is not pulled down to shutoff temperature-2 ℃ in the prior art, cause the return air defrost in the near future freezer temperature just be higher than normal turn-on temperature.The setting of C condition can prolong the return air defrost time when refrigerating chamber is maintained lower temperature; When the D condition has guaranteed that exception takes place, also can force to get into return air defrost step, avoid producing the bad course of work of the central endless loop formula of prior art described in the background technology.(2) refrigerating chamber control route beneficial effect: guarantee that temperature of refrigerating chamber is higher than design temperature+t, cause energy-conservation and the effect that helps defrost; Because can utilize the defrost cold that refrigerating chamber is freezed during defrost, as R1 when the defrost to design temperature, then refrigerating chamber is continued cooling during defrost and will cause temperature of refrigerating chamber low excessively, simultaneously because the refrigeration indoor air temperature is lower, the reduction of defrost effect.Freezing indoor temperature was lower when (3) refrigerating chamber control route had guaranteed that defrost begins, in order to avoid freezer temperature is too high so that influence refrigerating effect in the defrost process.
In said third step first substep; Said electric control gear is adjusted rotation speed of fan by following formula: the basic rotating speed * of rotation speed of fan n=blower fan ［ the start-stop ratio+b1* of 1+a1* defrost periods last time (environment temperature-25)/25+c1* ambient humidity ］, wherein the span of a1, b1 and c1 is all more than or equal to 0 smaller or equal to 1.
Start-stop is bigger than more, and the frost layer is thick relatively more; Air humidity is big more, and the frost layer is thick relatively more; Environment temperature is high more, and the frost layer is thick relatively more, therefore according to above-mentioned formula, under these three kinds of situation, heightens rotation speed of fan, when situation is opposite, then exchanges slow rotation speed of fan mutually, so that rotation speed of fan can adapt to concrete defrosting operating condition more.
In said third step second substep, electric control gear is that the defrost time t2 that return air defrost timer sets confirms by following formula: the basic defrost time * of return air defrost time t2=return air defrost ［ the start-stop ratio+b2* of this defrost periods of 1+a2* (environment temperature-25)/25+c2* ambient humidity ］.
Start-stop is bigger than more, and the frost layer is thick relatively more; Air humidity is big more, and the frost layer is thick relatively more; Environment temperature is high more, and the frost layer is thick relatively more, therefore according to above-mentioned formula, under these three kinds of situation, prolongs the defrost time relatively, when situation is opposite, then shortens the defrost time relatively, so that defrost can adapt to concrete defrosting operating condition more.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the flow chart of the energy-conservation defrosting control method of wind cooling refrigerator of the present invention.
The specific embodiment
As shown in Figure 1, wind cooling refrigerator of the present invention comprises refrigeration system, electric control gear 2, sensing device, refrigerating chamber 3, refrigerating chamber 4 and ducting system.Refrigeration system comprises evaporimeter 1.Said ducting system comprises blower fan 6, refrigerating chamber air door 7 and the return air inlet 12 that is provided with in air channel 5, this air channel 5; Said sensing device comprises refrigerator temperature sensor 11, freezer temperature sensor 8 and evaporator temperature sensor 9; Be provided with the timing part in the said electric control gear 2, timing is prepared timer 2B, return air defrost timer 2C and electrical heating defrost timer 2D before partly comprising compressor operating timer 2A, defrost.Said refrigerator temperature sensor 11 is arranged on the bottom of refrigerating chamber, and said freezer temperature sensor 8 is arranged on the bottom of refrigerating chamber.
Refrigerating chamber air door 7 is arranged on refrigerating chamber 3 tops, and said return air inlet 12 is arranged on the bottom of refrigerating chamber 3, when blower fan 6 is opened with refrigerating chamber air door 7; The gas of refrigerating chamber 3 bottoms is drawn into air channel 5 through return air inlet 12; Air-flow obtains cooling when the evaporator place, cold airflow upwards is admitted to the top of refrigerating chamber 3 through refrigerating chamber air door 7, accomplishes a complete air-flow circulation; In the process of circulation, air-flow is brought the cold of evaporimeter into refrigerating chamber.
Like Fig. 2 and shown in Figure 1, the present invention also provides a kind of energy-conservation defrosting control method that utilizes above-mentioned wind cooling refrigerator to realize.In a defrost periods; The time that the preceding preparatory stage of defrost that on behalf of the preceding preparation of defrost timer, T1 add up is experienced; The time that the return air defrost stage that on behalf of return air defrost timer, T2 added up is experienced; The time that the electrical heating defrost stage that on behalf of electrical heating defrost timer 2D, T3 added up is experienced, the time that the compressor accumulative total that on behalf of the compressor operating timer, T4 added up is moved.
Energy-conservation defrosting control method of the present invention in turn includes the following steps:
One, first step is the value of the T4 that added up of electric control gear 2 inspection compressor operating timers, hour then gets into second step like T4 >=7.5, hour then makes refrigerator keep normal refrigerating operaton state like T4＜7.5.
Two, second step is a preparation before the defrost, comprises following substep successively:
First substep is to prepare timer before the defrost to pick up counting;
Second substep comprises the refrigerating chamber control route and the refrigerating chamber control route of operation simultaneously, and the condition of jumping out of second substep comprises C condition and D condition;
The C condition is refrigerating chamber sensor temperature F1＜shutoff temperature-2 ℃;
The D condition is T1 >=70 minute;
In the running of refrigerating chamber control route and refrigerating chamber control route, when C or D satisfy (comprising the situation that both satisfy simultaneously) when arbitrary at least, electric control gear 2 execution second step jump out action;
The initial actuating of refrigerating chamber control route is the temperature R1 of electric control gear 2 inspection refrigerator temperature sensors 11; Like R1＜design temperature+t1 ℃ (design temperature refers to the temperature value that the refrigerator user sets), then closing cold room air door 7 is to stop to refrigerating chamber supply cold wind; Otherwise open refrigerating chamber air door 7, to refrigerating chamber freeze (can tackle like this user just put into the temperature food with high cause the too high situation of temperature of refrigerating chamber); The value of electric control gear 2 inspection T1 in the process of refrigerastion (be equal to prepare timer before the defrost initiatively T1 is provided whether more than or equal to 70 minutes signal) to electric control gear 2, as T1 >=70 minute then electric control gear 2 control refrigerators carry out the action of jumping out of second step; Like T1＜70 minute, then return back to the initial actuating of refrigerating chamber control route; Wherein, the span of parametric t 1 is 5 ± 2, and optimum value is 5;
The initial actuating of refrigerating chamber control route is the temperature F1 of electric control gear 2 inspection freezer temperature sensors 8, satisfies (be F1＜shutoff temperature-2 ℃) like the C condition, and then electric control gear 2 control refrigerators are carried out the action of jumping out of second step; Like F1 >=shutoff temperature-2 ℃, then electric control gear 2 continues the value of inspection T1, as the D condition satisfy (be T1 >=70 minute) then electric control gear 2 control refrigerators carry out the action of jumping out of second step; Like T1＜70 minute, then return back to the initial actuating of refrigerating chamber control route;
The action of jumping out of second substep is that electric control gear 2 is with preparing the timer zero clearing before the defrost.
Third step is the return air defrost, and this step comprises following substep:
First substep is electric control gear 2 close compressor; Start blower fan 6; Opening refrigerating chamber air door 7 (uses wind cooling refrigerator of the present invention, refrigerating chamber air door and refrigerating chamber blower fan can be set, also refrigerating chamber air door and refrigerating chamber blower fan can be set; Certainly under situation about being provided with, refrigerating chamber also can with the shared blower fan of refrigerating chamber; As be provided with the refrigerating chamber air door, should it be closed, as be provided with independent refrigerating chamber blower fan, also should it be closed), get into the 3rd substep then;
Second substep is that electric control gear 2 control return air defrost timers pick up counting or continue timing, prepares the timer zero clearing before the defrost, second step finishes this substep of back and carries out simultaneously with first substep; When being finished to change this substep over to by second step, return air defrost timer picks up counting; When returning this substep by the 3rd substep redirect, return air defrost timer continues timing;
The 3rd substep is whether electric control gear 2 detection return air defrost timer timing finish; Being the preset value t2 whether T2 reaches the return air defrost time, is then to get into the 4th substep, whether is lower than 0 degree otherwise detect temperature of refrigerating chamber R1; Like temperature of refrigerating chamber R1≤0 degree; Then get into the 4th substep, like temperature of refrigerating chamber R1＞0 degree, then electric control gear 2 control refrigerators return and carry out second substep;
The 4th substep is that electric control gear 2 stops compressor, closes blower fan 6 and refrigerating chamber air door 7, finishes return air defrost step.
The 4th step is an electrical heating defrost step, and this steps in sequence comprises following substep:
First substep is that opening electric heater carries out the electrical heating defrost, starts electrical heating defrost timer 2D simultaneously and carries out timing; With continuous 11 defrosts is one-period; Preceding 10 defrost times all are set at and are no more than 25 minutes in each cycle; Electric control gear 2 cuts out electric heater when being T3＞25 minute; The 11st defrost time set be for being no more than 40 minutes in period 1, and promptly electric control gear 2 cuts out electric heater during T3＞40 minute;
Second substep is when continuing to carry out the electrical heating defrost; Electric control gear 2 detects the value H1 of defrosting sensor; Detect electrical heating defrost timer T3 timing simultaneously and whether reach said setting value, when H1＞6 or T3＞said setting value, get into the 5th step; When H1≤6 and electrical heating defrost timer T3≤above-mentioned setting value, carry out this substep again;
The 5th step is the zero clearing of defrost timer and picks up counting again that the epicycle defrost periods finishes.
Each timer involved in the present invention all both can be positive number timing (timing to a certain preset value of promptly starting from scratch), also can be countdown (promptly beginning to countdown to zero from a certain preset value).
In said third step first substep, said electric control gear 2 is adjusted blower fan 6 rotating speeds by following formula:
(blower fan 6 can adopt the blower fan of the various models of common wind cooling refrigerator employing to the basic rotating speed * of rotation speed of fan n=blower fan ［ the start-stop ratio+b1* of 1+a1* defrost periods last time (environment temperature-25)/25+c1* ambient humidity ］; The basic rotating speed of blower fan refers to the rated speed of institute's employing blower fan), wherein the span of a1, b1 and c1 is all more than or equal to 0 smaller or equal to 1.A1, b1 and c1 are that refrigerator is in the design phase; Receive start-stop than the influence degree of, environment temperature and environment temperature and definite fixed value by the designer according to the refrigerating chamber of specific model of refrigerator; In case be constant after confirming well, in the day-to-day operation process of refrigerator, no longer change.Refrigerating chamber like certain model refrigerator is bigger, and the refrigerating chamber foaming layer is thinner, and environment temperature will be bigger to the influence of refrigerating chamber so, and the b1 value relatively will be bigger so.In a word, the occurrence of these three parameters of a1, b1 and c1 is to confirm in the process of experiment according to the concrete condition of different model refrigerator, so that its occurrence is complementary with start-stop ratio, environment temperature and the ambient humidity influence degree to cold compartment of refrigerator.Design phase; A1, b1 and c1 value principle are in the trial run of model machine; Then a1 is also big more for the start-stop ratio of defrost periods last time bigger (big more to the temperature of refrigerating chamber influence); Then b1 is big more for environment temperature high more (big more to the refrigerating chamber influence), and then c1 is big more for ambient humidity bigger (big more to the temperature of refrigerating chamber influence).）
In said third step second substep, the defrost time t2 that electric control gear 2 sets for return air defrost timer confirms by following formula: the basic defrost time * of return air defrost time t2=return air defrost ［ the start-stop ratio+b2* of this defrost periods of 1+a2* (environment temperature-25)/25+c2* ambient humidity ］.Wherein, a2, b2, these three parameters of c2 are the same with a1, b1 and c1, are the values of confirming through experiment to the refrigerator of model in the design phase, and the method for confirming is identical with definite method of a1, b1 and c1.
Claims (6)
1. wind cooling refrigerator comprises refrigeration system, electric control gear, sensing device, refrigerating chamber, refrigerating chamber and ducting system; Sensing device is connected with electric control gear, it is characterized in that:
Said ducting system comprises blower fan, refrigerating chamber air door and the return air inlet that is provided with in air channel, this air channel;
Said sensing device comprises refrigerator temperature sensor, freezer temperature sensor and evaporator temperature sensor;
Be provided with the timing part in the said electric control gear, timing is prepared timer, return air defrost timer and electrical heating defrost timer before partly comprising compressor operating timer, defrost.
2. wind cooling refrigerator according to claim 1 is characterized in that: said refrigerating chamber air door is arranged on the refrigerating chamber top, and said return air inlet is arranged on the bottom of refrigerating chamber.
3. wind cooling refrigerator according to claim 2 is characterized in that: said refrigerator temperature sensor is arranged on the bottom of refrigerating chamber, and said freezer temperature sensor is arranged on the bottom of refrigerating chamber.
4. the energy-conservation defrosting control method of said wind cooling refrigerator is characterized in that:
In a defrost periods; The time that the preceding preparatory stage of defrost that on behalf of the preceding preparation of defrost timer, T1 add up is experienced; The time that the return air defrost stage that on behalf of return air defrost timer, T2 added up is experienced; The time that the electrical heating defrost stage that on behalf of electrical heating defrost timer, T3 added up is experienced, the time that the compressor accumulative total that on behalf of the compressor operating timer, T4 added up is moved;
This control method in turn includes the following steps:
One, first step is the value of the T4 that added up of electric control gear inspection compressor operating timer, hour then gets into second step like T4 >=7.5, hour then makes refrigerator keep normal refrigerating operaton state like T4＜7.5;
Two, second step is a preparation before the defrost, comprises following substep successively:
First substep is to prepare timer before the defrost to pick up counting;
Second substep comprises the refrigerating chamber control route and the refrigerating chamber control route of operation simultaneously, and the condition of jumping out of second substep comprises C condition and D condition;
The C condition is refrigerating chamber sensor temperature F1＜shutoff temperature-2 ℃;
The D condition is T1 >=70 minute;
Control in the running of route at refrigerating chamber control route and refrigerating chamber, when C or D satisfy when arbitrary at least, electric control gear is carried out the action of jumping out of second step;
The initial actuating of refrigerating chamber control route is the temperature R1 of electric control gear inspection refrigerator temperature sensor, and as R1＜design temperature+t1 ℃, then the closing cold room air door is to stop to refrigerating chamber supply cold wind; Otherwise open the refrigerating chamber air door, refrigerating chamber is freezed; The value of electric control gear inspection T1 in the process of refrigerastion, as T1 >=70 minute then electric control gear control refrigerator carry out the action of jumping out of second step; Like T1＜70 minute, then return back to the initial actuating of refrigerating chamber control route; Wherein, the span of parametric t 1 is 5 ± 2;
The initial actuating of refrigerating chamber control route is the temperature F1 of electric control gear inspection freezer temperature sensor, satisfies like the C condition, and then electric control gear control refrigerator is carried out the action of jumping out of second step; Like F1 >=shutoff temperature-2 ℃, then electric control gear continues the value of inspection T1, satisfies the action of jumping out that electric control gear control refrigerator is then carried out second step like the D condition; Like T1＜70 minute, then return back to the initial actuating of refrigerating chamber control route;
The action of jumping out of second substep is that electric control gear is prepared the timer zero clearing before with defrost;
Third step is the return air defrost, and this step comprises following substep:
First substep is the electric control gear close compressor, starts blower fan, opens the refrigerating chamber air door, gets into the 3rd substep then;
Second substep is that electric control gear control return air defrost timer picks up counting or continues timing, prepares the timer zero clearing before the defrost, second step finishes this substep of back and carries out simultaneously with first substep; When being finished to change this substep over to by second step, return air defrost timer picks up counting; When returning this substep by the 3rd substep redirect, return air defrost timer continues timing;
The 3rd substep is whether the timing of electric control gear detection return air defrost timer finishes; Being the preset value t2 whether T2 reaches the return air defrost time, is then to get into the 4th substep, whether is lower than 0 degree otherwise detect temperature of refrigerating chamber R1; Like temperature of refrigerating chamber R1≤0 degree; Then get into the 4th substep, like temperature of refrigerating chamber R1＞0 degree, then electric control gear control refrigerator returns and carries out second substep;
The 4th substep is that electric control gear stops compressor, closes blower fan and refrigerating chamber air door, finishes return air defrost step;
The 4th step is an electrical heating defrost step, and this steps in sequence comprises following substep:
First substep is that opening electric heater carries out the electrical heating defrost, starts electrical heating defrost timer simultaneously and carries out timing; With continuous 11 defrosts is one-period; Preceding 10 defrost times all are set at and are no more than 25 minutes in each cycle; Electric control gear cuts out electric heater when being T3＞25 minute; The 11st defrost time set be for being no more than 40 minutes in period 1, and promptly electric control gear cuts out electric heater during T3＞40 minute;
Second substep is when continuing to carry out the electrical heating defrost; Electric control gear detects the value H1 of defrosting sensor; Detect electrical heating defrost timer T3 timing simultaneously and whether reach said setting value, when H1＞6 or T3＞above-mentioned setting value, get into the 5th step; When H1≤6 and electrical heating defrost timer T3≤said setting value, carry out this substep again;
The 5th step is the zero clearing of defrost timer and picks up counting again that the epicycle defrost periods finishes.
5. the energy-conservation defrosting control method of wind cooling refrigerator according to claim 2: it is characterized in that: in said third step first substep, said electric control gear is by following formula adjustment rotation speed of fan:
The basic rotating speed * of rotation speed of fan n=blower fan ［ the start-stop ratio+b1* of 1+a1* defrost periods last time (environment temperature-25)/25+c1* ambient humidity ］, wherein the span of a1, b1 and c1 is all more than or equal to 0 smaller or equal to 1.
6. the energy-conservation defrosting control method of wind cooling refrigerator according to claim 3: in said third step second substep, electric control gear is that the defrost time t2 that return air defrost timer sets confirms by following formula: the basic defrost time * of return air defrost time t2=return air defrost ［ the start-stop ratio+b2* of this defrost periods of 1+a2* (environment temperature-25)/25+c2* ambient humidity ］.
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