CN113503675A - Refrigerator defrosting demand judgment method - Google Patents
Refrigerator defrosting demand judgment method Download PDFInfo
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- CN113503675A CN113503675A CN202110776409.2A CN202110776409A CN113503675A CN 113503675 A CN113503675 A CN 113503675A CN 202110776409 A CN202110776409 A CN 202110776409A CN 113503675 A CN113503675 A CN 113503675A
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- evaporator
- temperature
- defrosting
- refrigerator
- judgment
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- 238000010257 thawing Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000003507 refrigerant Substances 0.000 claims abstract description 28
- 238000002844 melting Methods 0.000 claims abstract description 3
- 230000008018 melting Effects 0.000 claims abstract description 3
- 238000005057 refrigeration Methods 0.000 claims description 5
- 239000003570 air Substances 0.000 description 10
- 239000012080 ambient air Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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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
- F25D21/002—Defroster control
- F25D21/008—Defroster control by timer
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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
- 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
- F25D2321/00—Details or arrangements for defrosting; Preventing frosting; Removing condensed or defrost water, not provided for in other groups of this subclass
-
- 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
- F25D2600/02—Timing
-
- 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
-
- 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
- F25D2700/00—Means for sensing or measuring; Sensors therefor
- F25D2700/14—Sensors measuring the temperature outside the refrigerator or freezer
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Defrosting Systems (AREA)
Abstract
The invention discloses a method for judging defrosting requirements of a refrigerator, and relates to the technical field of refrigerators. The method comprises a frost melting judgment method, and the judgment method comprises the following steps: dividing the standard operating environment temperature of the refrigerator into a plurality of gears, and respectively specifying the temperature difference required by normal defrosting at each gear; setting an evaporator inlet and outlet temperature difference threshold, an evaporator final temperature threshold and an evaporator falling temperature threshold in fixed time under three states of refrigerant leakage and fan or air door failure; the temperature difference is judged in a determined time period after the compressor starts to operate, and the refrigerant leakage and the fault of the fan or the air door are judged by comparing the temperature difference, so that whether the evaporator has a defrosting requirement is determined. According to the invention, under different environment temperatures, the quantity directly related to whether the evaporator needs defrosting or not is comprehensively judged, including the temperature difference of the inlet and the outlet of the evaporator, the final temperature of the evaporator and the falling temperature, so that whether the evaporator needs defrosting or not is determined, and the judgment is more direct and accurate.
Description
Technical Field
The invention belongs to the technical field of refrigerators, and particularly relates to a refrigerator defrosting demand judgment method.
Background
In air-cooled refrigerators, the evaporator is one of the main heat exchange components. After the refrigerator runs for a period of time, the surface of the evaporator is covered with a frost layer, and the thicker the frost layer is, the lower the heat exchange efficiency of the evaporator is, so that the refrigeration effect of the refrigerator is poor, and the power consumption is high.
1. Patent 201811011923.1 mainly determines whether defrosting is required for an evaporator according to a temperature drop of a compartment of a refrigerator during a cooling period and a temperature difference between an inlet and an outlet of the evaporator of the refrigerator. However, the slow temperature drop in the refrigerator compartment is not necessarily caused by the thickness of the evaporator frost, and may be caused by refrigerant leakage, a cooling fan, and a damper failure. Therefore, whether the refrigerator evaporator needs defrosting needs to comprehensively consider the environmental temperature, the final temperature of the evaporator, the temperature difference of the inlet and the outlet of the evaporator and the falling temperature of the evaporator in a period of time.
2. The patent 201510416528.1 judges whether the evaporator of the refrigerator needs defrosting through the accumulated working time of the refrigerator, the door opening and closing times, the ambient temperature and the ambient humidity. However, the relationship between the accumulated working time of the refrigerator, the accumulated door opening and closing times and the defrosting requirement of the refrigerator is indirect, and the method for judging whether defrosting is needed is inaccurate.
The evaporator and the condenser are main components of the refrigerator for heat exchange. The evaporator is a heat absorbing part on the refrigerator and absorbs heat in the refrigerator. The condenser is a heat radiating member on the refrigerator, and radiates heat absorbed by the evaporator to air around the refrigerator. When the refrigerator refrigerates, low-temperature and low-pressure refrigerant flows in from an inlet of the evaporator, exchanges heat in the evaporator, absorbs the heat in the refrigerator, rises in temperature, and then flows out from an outlet of the evaporator. When the evaporator is operated for a period of time, the surface of the evaporator is covered with a layer of frost, and the layer of frost affects the heat exchange efficiency of the evaporator. The thicker the frost layer is, the lower the heat exchange efficiency is, so that the refrigerant flowing in the evaporator undergoes less heat exchange with the hot air in the refrigerator, and the temperature of the refrigerant at the outlet of the evaporator differs less from the temperature of the refrigerant at the inlet of the evaporator.
The temperature difference between the refrigerant at the inlet and the refrigerant at the outlet of the evaporator is simultaneously influenced by the ambient temperature. When the ambient temperature is high, the heat exchange efficiency between the high-temperature refrigerant in the condenser and the ambient air is low, so that the temperature of the refrigerant which finally flows to the inlet of the evaporator after being throttled by the capillary tube is higher. On the contrary, when the ambient temperature is low, the heat exchange efficiency between the high-temperature refrigerant in the condenser and the ambient air is high, so that the temperature of the refrigerant which finally flows to the inlet of the evaporator after being throttled by the capillary tube is low.
Whether the evaporator needs defrosting is judged, and besides the temperature difference of the inlet and the outlet of the evaporator and the ambient temperature, the influences caused by refrigerant leakage, the fault of a refrigeration fan and the fault of an air door need to be eliminated. Under normal conditions, when the evaporator needs defrosting, the evaporator is characterized in that: the temperature difference of the inlet and the outlet of the evaporator is small, the final temperature of the evaporator is low, and the temperature reduced in a fixed time is small. When the refrigerant leaks, the refrigerant leakage control device is characterized in that: the temperature difference between the inlet and the outlet of the evaporator is small, the final temperature of the evaporator is high, and the temperature reduced in a fixed time is small. When the refrigerating fan or the air door has a fault, the refrigerating fan is characterized in that: the temperature difference of the inlet and the outlet of the evaporator is small, the final temperature of the evaporator is low, and the temperature reduced in a fixed time is large.
From the above analysis, after the temperature characteristics of the refrigerator in different environmental temperatures and different fault states are comprehensively considered, whether the evaporator needs defrosting or not can be judged by comprehensively judging the temperature difference of the inlet and the outlet of the evaporator, the final temperature of the evaporator and the temperature falling within a fixed time.
Disclosure of Invention
The invention aims to provide a method for judging defrosting requirements of a refrigerator, which can judge whether an evaporator needs to be defrosted or not by comprehensively judging the temperature difference of an inlet and an outlet of the evaporator, the final temperature of the evaporator and the temperature reduced in a fixed time after comprehensively considering the temperature characteristics of the refrigerator in different environment temperatures and different fault states, and solves the problem of inaccurate fault interference in the conventional method for judging the defrosting requirements.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a refrigerator defrosting demand judging method, which is characterized by comprising the following steps: the refrigerator defrosting judgment system comprises a main control board, an environment temperature sensor and an evaporator inlet temperature sensor; the main control board acquires the temperatures detected by the three sensors and judges whether defrosting is needed according to the running state of the refrigerator;
the environment temperature sensor collects the environment temperature of the refrigerator during operation;
the evaporator inlet temperature sensor and the evaporator outlet temperature sensor are used for acquiring the temperature of the evaporator inlet and the temperature of the evaporator outlet;
the evaporator outlet temperature sensor simultaneously collects the temperature of the evaporator falling in a fixed time period;
the method comprises a frost melting judgment method, and the judgment method comprises the following steps:
dividing the standard operating environment temperature of the refrigerator into a plurality of gears, and respectively specifying the temperature difference required by normal defrosting at each gear;
setting an evaporator inlet and outlet temperature difference threshold, an evaporator final temperature threshold and an evaporator falling temperature threshold in fixed time under three states of refrigerant leakage and fan or air door failure;
the temperature difference is judged in a determined time period after the compressor starts to operate, and the refrigerant leakage and the fault of the fan or the air door are judged by comparing the temperature difference, so that whether the evaporator has a defrosting requirement is determined.
As a preferred technical solution of the present invention, the temperature difference required for normal defrosting includes: the threshold value of the temperature difference between the inlet and the outlet of the evaporator is delta T1, the final temperature threshold value of the evaporator is delta T2, and the falling temperature threshold value of the evaporator is delta T3.
As a preferred embodiment of the present invention,
the first step of the judging method is fixed time judgment, the fixed time judgment step is that a timer is started after the compressor is started, the continuous starting time of the compressor is recorded, and if the continuous starting time is less than or equal to the fixed time, the judgment is finished; and if the continuous starting time is longer than the fixed time, executing the next defrosting requirement judgment.
As a preferred embodiment of the present invention,
judging whether the temperature difference threshold of the inlet and the outlet of the evaporator is smaller than a specified threshold delta T1 or not according to the gear of the current environment temperature of the refrigerator, and if the temperature difference between the inlet and the outlet of the evaporator is larger than or equal to the specified temperature difference threshold delta T1, indicating that the refrigerator is normally refrigerated and has no defrosting requirement at present, and finishing the judgment;
and if the temperature difference is smaller than the specified temperature difference threshold delta T1, performing the next refrigerant fault judgment.
As a preferred embodiment of the present invention,
the refrigerant fault judging step is that the final temperature of the evaporator at the end of timing is judged, if the final temperature of the evaporator is greater than a specified final temperature threshold value delta T2, the refrigerant leakage fault is attributed, an alarm is given, and the judgment is ended;
and if the final temperature of the evaporator is less than or equal to a specified final temperature threshold value delta T2, executing the next fan or damper fault judgment.
As a preferred embodiment of the present invention,
the fan and air door fault judging step is as follows: according to the recorded initial temperature of the evaporator and the final temperature of the evaporator at the end of timing, the falling temperature of the evaporator at the end of timing is calculated, if the falling temperature is greater than a specified temperature threshold value delta T3, the fault of a refrigeration fan or an air door is detected, an alarm is given out, and the judgment is finished;
and if the dropping temperature is less than or equal to a specified temperature threshold value delta T2, the evaporator has a defrosting requirement, and the evaporator enters a defrosting mode after the compressor is stopped.
The invention has the following beneficial effects:
1. the invention does not adopt the quantity which is not directly related to the defrosting demand of the evaporator for judging the defrosting demand, including the accumulated working time of the refrigerator and the accumulated door opening and closing times;
2. the amount directly related to whether the evaporator needs defrosting or not is comprehensively judged under different environment temperatures, and the amount comprises the temperature difference of an inlet and an outlet of the evaporator, the final temperature of the evaporator and the falling temperature, so that whether the evaporator needs defrosting or not is determined, and the judgment is more direct and accurate.
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 flow chart of a defrosting demand determination method according to the present invention;
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.
Referring to fig. 1, the present invention is a method for determining a defrosting requirement of a refrigerator, and a defrosting determination system of the refrigerator includes a main control board, an ambient temperature sensor, an evaporator inlet temperature sensor, and an evaporator outlet temperature sensor. The main control board is used for acquiring the temperatures of the three sensors, judging whether defrosting is needed according to the running state of the refrigerator, and simultaneously performing logic control on the running of the whole refrigerator; the environment temperature sensor is used for collecting the environment temperature of the refrigerator during operation; the evaporator inlet temperature sensor and the evaporator outlet temperature sensor are used for collecting the temperature of the evaporator inlet and the evaporator outlet. The evaporator outlet temperature sensor is also used to collect the temperature drop of the evaporator over a fixed period of time.
Judging whether the refrigerator needs defrosting or not, and dividing the standard operation environment temperature of the refrigerator into a plurality of grades. The temperature difference threshold value of an inlet and an outlet of the evaporator, the final temperature threshold value of the evaporator and the temperature threshold value of the evaporator which is reduced in fixed time under the three states of normal defrosting requirement, refrigerant leakage and fan or air door failure are respectively specified in each gear. Judging the time of the temperature difference as a determined time period after the compressor starts to operate; the temperature differences required for normal defrosting include: the threshold value of the temperature difference between the inlet and the outlet of the evaporator is delta T1, the final temperature threshold value of the evaporator is delta T2, and the falling temperature threshold value of the evaporator is delta T3. The judgment method comprises the following steps:
1. starting a timer after the compressor is started, recording the continuous starting time of the compressor, and finishing the judgment if the continuous starting time is less than or equal to a fixed time; if the continuous starting time is longer than the fixed time, executing the step 2;
2. if the continuous starting time of the compressor is longer than the fixed time, judging whether the temperature difference between the inlet and the outlet of the evaporator is smaller than a specified threshold value delta T1 according to the current environment temperature gear of the refrigerator; if the temperature difference between the inlet and the outlet of the evaporator is larger than or equal to a specified temperature threshold value delta T1, indicating that the refrigerator is normally refrigerated, and ending the judgment; if the temperature difference between the inlet and the outlet of the evaporator is less than the temperature difference, executing the step 3;
3. judging the final temperature of the evaporator when the timing is finished, if the temperature of the evaporator is greater than the specified temperature delta T2, judging that the temperature belongs to a refrigerant leakage fault, giving an alarm, and finishing the judgment; if the evaporator temperature is less than or equal to the specified temperature delta T2, executing the step 4;
4. judging the falling temperature of the evaporator when the timing is finished, if the falling temperature is greater than a specified temperature threshold value delta T3, judging that the temperature is a fault of a refrigeration fan or an air door, giving an alarm, and finishing the judgment; and if the dropping temperature is less than or equal to a specified temperature threshold value delta T3, the evaporator has a defrosting requirement, and the evaporator enters a defrosting mode after the compressor is stopped.
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 (6)
1. A refrigerator defrosting demand judgment method is characterized by comprising the following steps: the refrigerator defrosting judgment system comprises a main control board, an environment temperature sensor and an evaporator inlet temperature sensor; an evaporator outlet temperature sensor;
the main control board acquires the temperatures detected by the three sensors and judges the defrosting requirement according to the running state of the refrigerator;
the environment temperature sensor collects the environment temperature of the refrigerator during operation;
the evaporator inlet temperature sensor and the evaporator outlet temperature sensor are used for acquiring the temperature of the evaporator inlet and the temperature of the evaporator outlet;
the evaporator outlet temperature sensor simultaneously collects the temperature of the evaporator falling in a fixed time period;
the method comprises a frost melting judgment method, and the judgment method comprises the following steps:
dividing the standard operating environment temperature of the refrigerator into a plurality of gears, and respectively specifying the temperature difference required by normal defrosting at each gear;
setting an evaporator inlet and outlet temperature difference threshold, an evaporator final temperature threshold and an evaporator falling temperature threshold in fixed time under three states of refrigerant leakage and fan or air door failure;
the temperature difference is judged in a determined time period after the compressor starts to operate, the refrigerant leakage and the fault state of a fan or an air door are judged through temperature difference comparison, and the defrosting requirement of the evaporator is determined.
2. The method for judging the defrosting demand of the refrigerator according to claim 1, wherein: the temperature difference required for normal defrosting comprises the following steps: the threshold value of the temperature difference between the inlet and the outlet of the evaporator is delta T1, the final temperature threshold value of the evaporator is delta T2, and the falling temperature threshold value of the evaporator is delta T3.
3. The method for judging the defrosting demand of the refrigerator according to claim 1, wherein:
the first step of the judging method is fixed time judgment, the fixed time judgment step is that a timer is started after the compressor is started, the continuous starting time of the compressor is recorded, and if the continuous starting time is less than or equal to the fixed time, the judgment is finished; and if the continuous starting time is longer than the fixed time, executing the next defrosting requirement judgment.
4. The method for judging the defrosting demand of the refrigerator according to claim 1, wherein:
judging whether the temperature difference threshold value of the inlet and the outlet of the evaporator is smaller than a specified temperature difference threshold value delta T1 or not according to the gear of the current environment temperature of the refrigerator, if the temperature difference threshold value of the inlet and the outlet of the evaporator is not smaller than the specified temperature difference threshold value delta T1, indicating that the refrigerator is normally refrigerated at present and has no defrosting requirement, and finishing the judgment;
and if the temperature difference threshold value of the inlet and the outlet of the evaporator is lower than the specified temperature difference threshold value delta T1, executing the next step of refrigerant fault judgment.
5. The method for judging the defrosting demand of the refrigerator according to claim 1, wherein:
the refrigerant fault judging step is that the final temperature of the evaporator at the end of timing is judged, if the final temperature of the evaporator is higher than a specified final temperature threshold value delta T2, the refrigerant leakage fault is attributed, an alarm is given, and the judgment is ended;
and if the final temperature of the evaporator is not higher than the specified final temperature threshold delta T2, executing the next fan or damper fault judgment.
6. The method for judging the defrosting demand of the refrigerator according to claim 1, wherein:
the fan and air door fault judging step is as follows: according to the recorded initial temperature of the evaporator and the final temperature of the evaporator at the end of timing, the falling temperature of the evaporator at the end of timing is calculated, if the falling temperature is higher than a specified temperature threshold value delta T3, the fault of a refrigeration fan or an air door is detected, an alarm is given out, and the judgment is ended;
and if the dropping temperature is not higher than a specified temperature threshold value delta T2, the evaporator has a defrosting requirement, and the evaporator enters a defrosting mode after the compressor is stopped.
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| CN202110776409.2A CN113503675A (en) | 2021-07-09 | 2021-07-09 | Refrigerator defrosting demand judgment method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114562851A (en) * | 2022-03-28 | 2022-05-31 | 长虹美菱股份有限公司 | Refrigerator and defrosting control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114562851A (en) * | 2022-03-28 | 2022-05-31 | 长虹美菱股份有限公司 | Refrigerator and defrosting control method thereof |
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