CN102748917A - Defrosting control method for inverter refrigerator - Google Patents

Abstract

The invention discloses a defrosting control method for an inverter refrigerator. According to the rotation speed of the inverter refrigerator, an evaporator temperature sensor, an indoor temperature sensor and an environmental temperature sensor, refrigerator controller software is used for detection and judgment, defrosting starting time is accurately determined, the defrosting process is timely finished, and the purposes of effective defrosting, preservation and energy consumption reduction are achieved.

Description

A kind of frequency conversion refrigerator defrosting control method

Technical field:

The present invention relates to a kind of frequency conversion refrigerator defrosting control method.

Background technology:

Refrigerator is in actual moving process, and airborne steam runs into the low-temperature surface of evaporimeter, the frosting phenomenon can occur.The formation of frost produces bigger influence to the heat exchange property and the air wide pre. drop of evaporimeter.If untimely defrosting, the refrigeration performance of refrigerator is decay constantly.

Existing frost-free refrigerator defrosting control method generally adopts " time-temperature method "; It is the given defrost interval time that is provided with in advance; In influence factors such as group switch door, environment temperature, humidity, compressor continuous operating times; Constantly revise the defrost interval time, when compressor accumulated running time reaches this defrost interval and gets into the defrosting program during time.This defrosting control method is rule of thumb to infer, lets refrigerator according to set pattern " on time " defrosting, rather than " as required " defrosting, may cause when the refrigerator refrigeration performance is still good, occurring unnecessary defrosting.A kind of in addition novel defrosting control method; As disclosed among the one Chinese patent application CN102297565A; Adopt the difference of evaporating temperature and freezer temperature to monitor heat exchange property; Realize " as required " defrosting, but the method is not considered the particularity of frequency conversion refrigerator, the difference of frequency conversion rotating speed directly affects the variation of temperature gap.

Summary of the invention:

For overcoming the defective of prior art, the object of the present invention is to provide a kind of frequency conversion refrigerator defrosting control method, consider the particularity of frequency conversion refrigerator, under different rotating speeds, set the heat exchange property that the different temperature difference is monitored evaporimeter.

Technical solution problem of the present invention adopts following technical scheme:

A kind of frequency conversion refrigerator defrosting control method,

Frequency conversion refrigerator can comprise S1, S2, S3, S4, S5 with rotating speed ... Sn, under given different rotating speeds, the varying environment temperature, the corresponding respectively evaporator temperature sensor and the limit temperature difference △ T of an indoor temperature transmitter; Frequency conversion refrigerator operates under the rotating speed Si state, and limit temperature difference △ T and environment temperature Th concern as follows:

$\left\{\begin{array}{cc}\mathrm{\&Delta;\; T}=\mathrm{Ai}& (\mathrm{Th}<a)\\ \mathrm{\&Delta;\; T}=\mathrm{Bi}*\mathrm{Th}+\mathrm{Ci}& (a\&le;\mathrm{Th}\&le;b)\\ \mathrm{\&Delta;\; T}=\mathrm{Di}& (\mathrm{Th}>b)\end{array}\right.$ (formula 1)

Ai, Bi, Ci, Di (i=1,2,3 ... N) be refrigerator corresponding rotating speed Si (i=1,2,3 ... N) under, according to the constant parameter of experimental measurement;

The actual temperature difference △ Tce of a detected evaporator temperature sensor Te of computing controller and an indoor temperature transmitter Tc is following:

△ Tce=Tc-Te (formula 2)

The longest defrost time interval timer 1 is set, rises from power on and begin accumulative total refrigerator conduction time, be the nature clock said conduction time, non-compressor accumulated running time;

Refrigerator is under the refrigerating state, every interval t (3＜t＜20) minute, judges whether a △ Tce satisfies formula 3 with the following corresponding limit temperature difference △ T of the current running speed of refrigerator:

△ Tce＞△ T (formula 3)

Judge if 1 time of timer reaches ∑ ts (16～100) hour or N continuous time (2＜N＜10) occurs, all satisfy formula 3 requirements, promptly begin defrosting; Start defrosting heater, when evaporator temperature sensor is elevated to break-off signal point, break off heater; Wait for 5～10 minutes, finish defrost.

Carrying out the judgement of formula 3 carries out after meeting the following conditions: compressor accumulated running time ∑ ti (∑ ti zero clearing when at every turn beginning to defrost) is lower than design temperature T0 (T0 is-18 ℃～-28 ℃) greater than setting-up time t0 (3～12 hours) and evaporator temperature sensor Te.

Compared with present technology, beneficial effect of the present invention is embodied in:

1, to frequency conversion refrigerator, consider the actual temperature difference and the comparison of the limit temperature difference under the frequency conversion rotating speed difference, reach the purpose that " as required " defrost.

2, set the longest defrost time interval, guarantee that refrigerator is under the varying environment condition, is limited within a certain period of time defrost at least once.

Description of drawings:

Fig. 1 is the relation curve sketch map of frequency conversion rotating speed Si involved in the present invention, environment temperature Th, limit temperature difference △ T.

Fig. 2 is the FB(flow block) of the related part of defrosting control method of the present invention.

Below pass through the specific embodiment, and in conjunction with the accompanying drawings the present invention is described further.

The specific embodiment:

Embodiment: referring to Fig. 1 curve synoptic diagram,

Frequency conversion refrigerator can comprise S1, S2, S3, S4, S5 with rotating speed ... Sn, under given different rotating speeds, the varying environment temperature, the corresponding respectively evaporator temperature sensor and the limit temperature difference △ T of an indoor temperature transmitter; Frequency conversion refrigerator operates under the rotating speed Si state, and limit temperature difference △ T and environment temperature Th concern as follows:

$\left\{\begin{array}{cc}\mathrm{\&Delta;\; T}=\mathrm{Ai}& (\mathrm{Th}<a)\\ \mathrm{\&Delta;\; T}=\mathrm{Bi}*\mathrm{Th}+\mathrm{Ci}& (a\&le;\mathrm{Th}\&le;b)\\ \mathrm{\&Delta;\; T}=\mathrm{Di}& (\mathrm{Th}>b)\end{array}\right.$ (formula 1)

In two sections of ring warm Th＜a and Th＞b, △ T value is a constant;

In ring warm a≤Th≤b:

Under the same rotating speed, limit temperature difference △ T reduces along with the rising of environment temperature;

Under the identical ring temperature, limit temperature difference △ T increases along with the rising of rotating speed;

Referring to Fig. 2 FB(flow block), frequency conversion refrigerator defrosting control method concrete steps of the present invention are following:

After refrigerator powered on, with each timer initialization, timer 1 began accumulative total refrigerator conduction time; Every interval t (3＜t＜10) minute, when being in refrigerating state, compressor accumulated running time ∑ ti reached setting-up time t0 (t0 got 3～12 hours) and evaporator temperature sensor Te is lower than design temperature T0 (T0 gets-18 ℃～-28 ℃) satisfying; Judge whether a △ Tce＞△ T is true; If 1 time of timer reaches ∑ ts (∑ ts got 16～100 hours) or N continuous time (3＜N＜10) judges that △ Tce＞△ T result is very, promptly begin defrosting, start defrosting heater; When evaporator temperature sensor is elevated to break-off signal point; Break off heater, wait for 5～10 minutes, let defrost water all flow out the back and finish defrost.When beginning to defrost, compressor accumulated running time timer, timer 1 and defrosting result judge the equal zero clearing of register.With the continuous cycle criterion defrosting of this pattern condition, promptly begin defrosting after satisfying afterwards.

Claims (7)

1. frequency conversion refrigerator defrosting control method is characterized in that:

Frequency conversion refrigerator can comprise S1, S2, S3, S4, S5 with rotating speed ... Sn, under given different rotating speeds, the varying environment temperature, the corresponding respectively evaporator temperature sensor and the limit temperature difference △ T of an indoor temperature transmitter; Frequency conversion refrigerator operates under the rotating speed Si state, and limit temperature difference △ T and environment temperature Th concern as follows:

$\left\{\begin{array}{cc}\mathrm{\&Delta;\; T}=\mathrm{Ai}& (\mathrm{Th}<a)\\ \mathrm{\&Delta;\; T}=\mathrm{Bi}*\mathrm{Th}+\mathrm{Ci}& (a\&le;\mathrm{Th}\&le;b)\\ \mathrm{\&Delta;\; T}=\mathrm{Di}& (\mathrm{Th}>b)\end{array}\right.$ (formula 1)

Ai, Bi, Ci, Di (i=1,2,3 ... N) be refrigerator corresponding rotating speed Si (i=1,2,3 ... N) under, according to the constant parameter of experimental measurement;

The actual temperature difference △ Tce of a detected evaporator temperature sensor Te of computing controller and an indoor temperature transmitter Tc is following:

△ Tce=Tc-Te (formula 2)

The longest defrost time interval timer 1 is set, rises from power on and begin accumulative total refrigerator conduction time, be the nature clock said conduction time, non-compressor accumulated running time;

Refrigerator is under the refrigerating state, every interval t (3＜t＜20) minute, judges whether a △ Tce satisfies formula 3 with the following corresponding limit temperature difference △ T of the current running speed of refrigerator:

△ Tce＞△ T (formula 3)

Judge if 1 time of timer reaches ∑ ts or N continuous time (2＜N＜10) occurs, all satisfy formula 3 requirements, promptly begin defrosting; Start defrosting heater, when evaporator temperature sensor is elevated to break-off signal point, break off heater; Wait for 5～10 minutes, finish defrost.

2. a kind of frequency conversion refrigerator defrosting control method according to claim 1 is characterized in that: said ∑ ts is 16～100 hours.

3. a kind of frequency conversion refrigerator defrosting control method according to claim 1 is characterized in that: the judgement of carrying out formula 3 is carried out after meeting the following conditions: compressor accumulated running time ∑ ti is greater than setting-up time t0.

4. a kind of frequency conversion refrigerator defrosting control method according to claim 1 and 2 is characterized in that: the judgement of carrying out formula 3 is carried out after meeting the following conditions: evaporator temperature sensor Te is lower than design temperature T0.

5. according to claim 1 or 3 described a kind of frequency conversion refrigerator defrosting control methods, it is characterized in that: said refrigerator accumulative total timer 1 conduction time and all zero clearings when at every turn beginning to defrost of compressor accumulated running time ∑ ti.

6. a kind of frequency conversion refrigerator defrosting control method in said according to claim 3, it is characterized in that: said t0 is 3～12 hours.

7. a kind of frequency conversion refrigerator defrosting control method in said according to claim 4, it is characterized in that: said T0 is-18 ℃～-28 ℃.

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