CN113108539A - Defrosting condition detection and control method for air-cooled refrigerator - Google Patents

Defrosting condition detection and control method for air-cooled refrigerator Download PDF

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Publication number
CN113108539A
CN113108539A CN202110419252.8A CN202110419252A CN113108539A CN 113108539 A CN113108539 A CN 113108539A CN 202110419252 A CN202110419252 A CN 202110419252A CN 113108539 A CN113108539 A CN 113108539A
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evaporator
fan
air
rotating speed
cooled refrigerator
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CN202110419252.8A
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Inventor
尚殿波
刘宏宇
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Changhong Meiling Co Ltd
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Changhong Meiling Co Ltd
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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
    • 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
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • F25D17/062—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation in household refrigerators
    • 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
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • F25D17/067—Evaporator fan units
    • 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
    • F25D21/002—Defroster control
    • 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
    • F25D29/00—Arrangement or mounting of control or safety devices
    • 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
    • F25D2600/00—Control issues
    • F25D2600/06—Controlling according to a predetermined profile

Abstract

The invention discloses a defrosting condition detection and control method of an air-cooled refrigerator, and relates to the technical field of refrigerators. In the present invention: when any one of the following conditions is met, the air-cooled refrigerator performs evaporator defrosting action: when the rotating speed of the evaporator fan is lower than a fan rotating speed threshold value; the timing module detects the natural operation time of the air-cooled refrigerator, and when the natural operation time of the air-cooled refrigerator exceeds the minimum operation time preset in the controller and the evaporator temperature information is lower than the evaporator temperature threshold preset in the controller; the timing module detects the natural running time of the air-cooled refrigerator, and when the natural running time of the air-cooled refrigerator exceeds the maximum running time preset in the controller. The invention utilizes the existing control circuit of the refrigerator and the evaporator fan to feed back and measure the functional relation between the rotating speed change of the fan and the frosting amount in real time, accurately judges the frosting condition of the evaporator, realizes quick defrosting according to the requirement, reduces the heating energy consumption of the refrigerator and ensures the working stability of the evaporator.

Description

Defrosting condition detection and control method for air-cooled refrigerator
Technical Field
The invention belongs to the technical field of refrigerators, and particularly relates to a method for detecting the frosting layer thickness of an evaporator of an air-cooled refrigerator and controlling defrosting of the evaporator.
Background
The evaporator is an important part in a refrigeration system of a refrigerator, is a main body of heat exchange in a refrigerator chamber, and particularly, the air-cooled refrigerator is gradually popularized and commonly uses a finned evaporator. The evaporator exchanges heat with the air in the chamber, and besides the temperature of the chamber is reduced, the water vapor in the chamber is cooled and deposited on the surface of the evaporator to form frost. When the surface of the evaporator grows along with frosting, the refrigeration effect gradually becomes worse, the energy consumption of the refrigerator is increased, and the normal refrigeration of the refrigerator is seriously influenced when the frost layer grows to influence the air circulation, so that the air-cooled refrigerator needs to be defrosted regularly. The bottom of the evaporator is usually provided with a heater to heat and defrost the evaporator.
The existing defrosting method of the air-cooled refrigerator evaporator generally adopts the technical scheme that a defrosting time set point is set according to empirical data, a heater is started to perform a defrosting function when a time interval is reached, and the defrosting process is stopped after frost is completely defrosted, and the refrigerating process is resumed in cycles.
However, the defrosting method using time as a fixed period cannot predict the thickness of a frost layer, and the practical defrosting effect has the problems of low defrosting efficiency, untimely defrosting and the like in implementation and use. For example, in the actual use process of a user, due to the fact that the water content of stored food is high, the times of opening and closing the door are increased at ordinary times, the evaporator frosts quickly, the defrosting interval time is not up, and normal refrigeration is possibly influenced if defrosting cannot be carried out; on the other hand, the evaporator frosts less, the refrigeration performance of the refrigerator is not obviously reduced, and the defrosting process is started when the defrosting time interval is up, so that the electric power is wasted and the energy consumption of the refrigerator is increased.
Other technical schemes for direct measurement, such as infrared detection, ultrasonic measurement, capacitance measurement and the like, are adopted in the industry, and the method is high in cost, needs to additionally add a measuring device and an auxiliary structure, is greatly increased in cost, is difficult to implement process structure, and is not applied in batch in the industry.
Disclosure of Invention
The invention aims to provide a defrosting condition detection and control method of an air-cooled refrigerator.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a defrosting condition detection and control method of an air-cooled refrigerator.
(1) The air speed detection circuit acquires air speed information of the evaporator fan, and the air speed detection circuit transmits the detected rotating speed information of the evaporator fan to the single chip microcomputer.
(2) The temperature sampling circuit acquires evaporator temperature information sensed by the evaporator temperature sensor, and the temperature sampling circuit transmits the evaporator temperature information to the single chip microcomputer.
(3) The corresponding functional relation between the fan rotating speed of the evaporator and the frosting thickness on the surface of the evaporator is preset in the controller, and the rotating speed threshold of the fan is correspondingly preset.
(4) The controller is internally preset with a corresponding function relation between the surface temperature of the evaporator and the frosting thickness of the surface of the evaporator, and is correspondingly preset with a temperature threshold of the evaporator.
(5) In the control method, when any one of the following conditions is met, the air-cooled refrigerator performs evaporator defrosting action: when the rotating speed of a fan of an evaporator is lower than a threshold value of the rotating speed of the fan; the timing module detects the natural operation time of the air-cooled refrigerator, and when the natural operation time of the air-cooled refrigerator exceeds the minimum operation time preset in the controller and the evaporator temperature information is lower than the evaporator temperature threshold preset in the controller; and thirdly, detecting the natural running time of the air-cooled refrigerator by the timing module, wherein the natural running time of the air-cooled refrigerator exceeds the maximum running time preset in the controller.
(6) In the control method, after defrosting of the evaporator is finished, the controller drives the timing module to restart timing.
As a preferred technical scheme of the invention, a preset fan rotating speed threshold and evaporator frosting thickness percentage are analyzed.
(1) Setting the threshold value of the rotating speed of the fan as VOTo the threshold value V of the rotation speed of the fanOAnd (5) carrying out analysis calculation.
When the surface of the evaporator is not frosted or the defrosting is finished, the controller starts the fan of the evaporator to normally operate, and records that the rotating speed of the fan is V at the moment1Continuously collecting and recording the rotating speed of the fan at intervals of time t, and setting the collected and recorded rotating speed of the fan as VO V1 ... VN]Wherein N is more than or equal to 3; then the threshold value of the rotating speed of the fan
Figure BDA0003027167060000031
(2) Sampling the evaporator temperature once every certain time in the refrigeration process, and setting the n-th measured fan rotating speed as VnUntil the evaporator is completely frosted, the rotating speed of a fan of the evaporator is VZAnd records the evaporator temperature at this time as the evaporator temperature threshold TO。
Fitting the frosting thickness function relation of the surface of the evaporator according to the collected fan rotating speed signal of the evaporator as follows:
Figure BDA0003027167060000032
wherein delta is the frosting thickness percentage, V is the fan rotating speed of the evaporator, Y is the percentage value coefficient, and Y belongs to [0, 100%]。
As a preferred technical scheme of the invention, a frosting thickness defrosting threshold value delta' and a fan rotating speed threshold value V are preset in the main controllerOAnd correspondingly.
As a preferred technical scheme of the invention, the minimum running time of the air-cooled refrigerator is set as tmin，tmin∈[240～720min]Let the maximum operation time of the air-cooled refrigerator be tmax，tmax∈[1440～4320min]。
As a preferred technical scheme of the invention, a fan rotating speed threshold value VO∈[600～1500rpm]Temperature of evaporatorDegree threshold TO∈[-32～-25℃]。
The invention has the following beneficial effects:
1. the invention utilizes the existing control circuit of the refrigerator and the evaporator fan to feed back and measure the functional relation between the fan rotating speed change and the frosting amount in real time, accurately judges the frosting condition of the evaporator, improves the accuracy of frosting detection and reduces the error of frosting detection to a certain extent.
2. According to the invention, based on the relationship of the frost formation amount of the evaporator obtained in real time, automatic defrosting setting is realized, defrosting efficiency is improved, further, reasonable and optimized defrosting control is achieved, rapid defrosting as required is realized, heating energy consumption of a refrigerator is reduced, and the working stability of the evaporator is ensured.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a control diagram of a frost detection apparatus;
fig. 2 is a flow chart of defrosting condition detection and control.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The invention aims to provide an evaporator frosting thickness detection method and is applied to defrosting control of a refrigerator evaporator.
The technical principle related to the invention comprises the following contents:
1. the control circuit of the refrigerator refrigerating system comprises an evaporator fan and a control circuit thereof, wherein the control circuit comprises a fan motor power supply input circuit, a motor rotating speed signal feedback circuit, an evaporator temperature sensor and a control chip.
2. In the refrigeration process of the refrigerator, a temperature sensor in the refrigerator collects the temperature of air in the refrigerator, and the change condition of the rotating speed of the fan is implemented together with a temperature signal through a signal feedback circuit and transmitted to a control chip in a control circuit.
3. The gradual frosting process of the evaporator leads to gradual increase of wind circulation resistance and reduction of refrigeration effect as the frosting occupies the space of the evaporator. In general, the rotating speed of a fan is in a descending trend, the evaporator is deteriorated due to frosting and heat exchange, and the temperature of the evaporator is in a descending trend.
4. A functional relation exists between the rotating speed of the fan and the frosting amount of the evaporator, a temperature threshold value is set by combining the temperature of the sensor of the evaporator as an auxiliary judgment condition by taking a rotating speed attenuation change amplitude value as a main judgment condition, and whether defrosting treatment is needed or not is judged together.
5. The defrosting condition is achieved, and the control chip performs evaporator defrosting through the control circuit.
Example two
First, a threshold value V of the rotating speed of the fanOThe method comprises the following steps:
starting the evaporator fan to normally operate when the surface of the evaporator is not frosted or the defrosting is finished, and recording the rotating speed V of the fan by the control chip1To avoid errors, the fan speed V can be continuously acquired and recorded at intervals t (time can be set in the acquisition rule as required)N(N represents the number of times, which is self-defined to include but not limited to 3 times), and the average rotation speed is taken as the rotation speed reference value.
Sampling every set time in the refrigerating process, wherein the n-th measured rotating speed of the fan is VnUntil the evaporator is completely frosted, the rotating speed is VZAnd record the evaporator temperature at that time(ii) a Fitting a frosting thickness function relation of the surface of the evaporator according to the collected rotating speed signal fn(delta. frosting thickness percent) fn(V: fan speed) (Y value range is 0-100%, 100% represents that the evaporator is completely frosted, 0 represents that the evaporator is not frosted); presetting a frosting thickness value delta '(delta' is a defrosting threshold value, delta 'is less than or equal to 100%), and the fan rotating speed corresponding to the defrosting threshold value delta' is a fan rotating speed threshold value VO。
Secondly, the following parameter values are preset in the refrigerator:
minimum refrigerator operating time tminThe value is recommended to be taken for 240-720 min;
maximum refrigerator operating time tmaxThe recommended value is 1440-4320 min;
threshold value V of fan rotating speedOThe suggested value is 600-1500 rpm;
evaporator temperature threshold TOThe suggested value is-32-25 ℃.
Specifically, the following values are preferable:
minimum refrigerator operating time tminTaking the value for 240 min;
maximum refrigerator operating time tmaxTaking 1440 min;
threshold value V of fan rotating speedOTaking the value of 800 rpm;
evaporator temperature threshold TOThe value was-30 ℃.
Thirdly, when the air-cooled refrigerator meets any one of the following conditions, defrosting is carried out.
When the rotating speed of the fan is lower than a set fan rotating speed threshold value VOWhen the current is over;
② when the natural operation time of the air-cooled refrigerator exceeds the set minimum operation time tminAnd the evaporator temperature is lower than a set evaporator temperature threshold TOThen (c) is performed.
Thirdly, when the natural running time of the air-cooled refrigerator exceeds the set maximum running time tmax。
EXAMPLE III
When the rotating speed of the fan of the refrigerator is lower than 800rpm, the evaporator enters defrosting.
Example four
When the temperature of the evaporator of the refrigerator is lower than-30 ℃ but the running time of the refrigerator does not exceed 240min, the defrosting is not carried out temporarily. When the running time of the refrigerator exceeds 240min or the rotating speed of a fan of the refrigerator is lower than 800rpm, the evaporator enters defrosting.
EXAMPLE five
When the refrigerator operation time exceeds the refrigerator maximum operation time 1440min, the evaporator enters defrost.
EXAMPLE six
The natural refrigerator running time recorded by the timing module can be replaced by the accumulated compressor running time, and the minimum accumulated running time t is correspondingly modifiedminAnd a maximum accumulated running time tmaxThe numerical value of (c).
In the description herein, references to the terms "embodiment" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims (5)

1. A defrosting condition detection and control method of an air-cooled refrigerator is characterized in that a frosting detection device and an evaporator fan are arranged in the air-cooled refrigerator, the frosting detection device comprises an evaporator temperature sensor, a timing module, a wind speed detection circuit, a single chip microcomputer, a controller and a communication interface circuit, the wind speed detection circuit and a temperature sampling circuit are respectively connected with the single chip microcomputer, and the defrosting condition detection and control method of the air-cooled refrigerator is characterized in that:
(1) the air speed detection circuit acquires air speed information of the evaporator fan and transmits the detected rotating speed information of the evaporator fan to the single chip microcomputer;
(2) the temperature sampling circuit acquires evaporator temperature information sensed by the evaporator temperature sensor, and transmits the evaporator temperature information to the single chip microcomputer;
(3) presetting a corresponding functional relation between the fan rotating speed of the evaporator and the frosting thickness on the surface of the evaporator in the controller, and correspondingly presetting a fan rotating speed threshold;
(4) presetting a corresponding functional relation between the surface temperature of the evaporator and the frosting thickness of the surface of the evaporator in the controller, and correspondingly presetting an evaporator temperature threshold;
(5) in the control method, when any one of the following conditions is met, the air-cooled refrigerator performs evaporator defrosting action:
when the rotating speed of a fan of an evaporator is lower than a threshold value of the rotating speed of the fan;
the timing module detects the natural operation time of the air-cooled refrigerator, and when the natural operation time of the air-cooled refrigerator exceeds the minimum operation time preset in the controller and the evaporator temperature information is lower than the evaporator temperature threshold preset in the controller;
the timing module detects the natural running time of the air-cooled refrigerator, and when the natural running time of the air-cooled refrigerator exceeds the maximum running time preset in the controller;
(6) in the control method, after defrosting of the evaporator is finished, the controller drives the timing module to restart timing.
2. The defrosting condition detection and control method of the air-cooled refrigerator according to claim 1, characterized in that:
analyzing a preset fan rotating speed threshold value and evaporator frosting thickness percentage;
(1) setting the threshold value of the rotating speed of the fan as VOTo the rotational speed threshold of the fanValue VOCarrying out analysis calculation;
when the surface of the evaporator is not frosted or the defrosting is finished, the controller starts the fan of the evaporator to normally operate, and records that the rotating speed of the fan is V at the moment1Continuously collecting and recording the rotating speed of the fan at intervals of time t, and setting the collected and recorded rotating speed of the fan as VO V1 ... VN]Wherein N is more than or equal to 3;
then the threshold value of the rotating speed of the fan
Figure FDA0003027167050000021
(2) Sampling the evaporator temperature once every certain time in the refrigeration process, and setting the n-th measured fan rotating speed as VnUntil the evaporator is completely frosted, the rotating speed of a fan of the evaporator is VZAnd records the evaporator temperature at this time as the evaporator temperature threshold TO；
Fitting the frosting thickness function relation of the surface of the evaporator according to the collected fan rotating speed signal of the evaporator as follows:
Figure FDA0003027167050000022
wherein delta is the frosting thickness percentage, V is the fan rotating speed of the evaporator, Y is the percentage value coefficient, and Y belongs to [0, 100%]。
3. The defrosting condition detection and control method of the air-cooled refrigerator according to claim 2, characterized in that:
the main controller is internally preset with a frosting thickness defrosting threshold value delta ', a frosting thickness defrosting threshold value delta' and a fan rotating speed threshold value VOAnd correspondingly.
4. The defrosting condition detection and control method of the air-cooled refrigerator according to claim 1, characterized in that:
let the minimum running time of the air-cooled refrigerator be tmin，tmin∈[240～720min]；
Let the maximum operation time of the air-cooled refrigerator be tmax，tmax∈[1440～4320min]。
5. The defrosting condition detection and control method of the air-cooled refrigerator according to claim 2, characterized in that:
threshold value V of fan rotating speedO∈[600～1500rpm]；
Evaporator temperature threshold TO∈[-32～-25℃]。
CN202110419252.8A 2021-04-19 2021-04-19 Defrosting condition detection and control method for air-cooled refrigerator Withdrawn CN113108539A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113606846A (en) * 2021-08-16 2021-11-05 合肥美菱物联科技有限公司 Defrosting control method for refrigerator
CN113865259A (en) * 2021-10-22 2021-12-31 珠海格力电器股份有限公司 Defrosting control method and device, air cooler and refrigeration house
CN114608258A (en) * 2022-03-11 2022-06-10 长虹美菱股份有限公司 Defrosting control method of refrigerator refrigerating system based on electronic expansion valve

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113606846A (en) * 2021-08-16 2021-11-05 合肥美菱物联科技有限公司 Defrosting control method for refrigerator
CN113865259A (en) * 2021-10-22 2021-12-31 珠海格力电器股份有限公司 Defrosting control method and device, air cooler and refrigeration house
CN114608258A (en) * 2022-03-11 2022-06-10 长虹美菱股份有限公司 Defrosting control method of refrigerator refrigerating system based on electronic expansion valve

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