CN110986465A - Refrigerator defrosting system - Google Patents
Refrigerator defrosting system Download PDFInfo
- Publication number
- CN110986465A CN110986465A CN201911096828.0A CN201911096828A CN110986465A CN 110986465 A CN110986465 A CN 110986465A CN 201911096828 A CN201911096828 A CN 201911096828A CN 110986465 A CN110986465 A CN 110986465A
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- CN
- China
- Prior art keywords
- control module
- heater
- evaporator
- defrosting
- refrigerator
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
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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
Abstract
The invention discloses a refrigerator defrosting system. In the invention: the defrosting sensor comprises an induction device and an amplifying circuit; the induction device is fixedly arranged at the upper end of the evaporator; the induction device comprises two polar plates which are arranged in parallel; the sensing device senses the thickness of the frost layer through the capacitance value between the polar plates which are arranged in parallel; the amplifying circuit consists of a peripheral circuit consisting of a triode, a resistor and a capacitor; the amplifying circuit amplifies the signal sensed by the sensing device and transmits the amplified signal to the control module; the control module is electrically connected with the heater; the control module controls the switch of the electric heater. The invention synchronously senses the thickness of the frost layer on the evaporator by arranging the sensing device, processes data by the control module and heats and defrosts by the heater; the frost layer on the evaporator is prevented from being too thick, so that the refrigerating efficiency of the refrigerator is reduced, the power consumption of the refrigerator is increased, the safety is improved by arranging the temperature fuse, and the fire disaster is avoided.
Description
Technical Field
The invention belongs to the field of refrigerator control methods, and particularly relates to a refrigerator defrosting system.
Background
Refrigerator defrosting is a problem that must be considered in a refrigerator control system, particularly in an air-cooled refrigerator control system. If the frost layer is too thick, the refrigeration efficiency is reduced, and the energy consumption is increased. Two major factors are mainly considered for defrosting of the refrigerator: factor 1: judging the condition of entering a defrosting state; factor 2: and (5) judging the condition of defrosting completion. For the factor 1, whether to enter the defrosting state is currently realized mainly according to the refrigerating time of compartments (refrigerating chamber, freezing chamber and temperature-changing chamber) or the running time of a compressor through software judgment. The refrigerating time or the running time of the compressor is fixed or not. The fixed time refers to that the defrosting refrigeration time or the compressor running time set by the system is a fixed value, and the defrosting state is entered when the time is up. The unfixed time means that the defrosting entry time is not a fixed value, and the system can determine the defrosting entry time in each time by combining factors such as the number of times of opening the door of the refrigerator, the ambient temperature, the humidity and the like. For the factor 2, whether the defrosting exit condition is reached is judged mainly according to the defrosting temperature and the defrosting time. In the defrosting process, whether the defrosting temperature reaches the quitting temperature or not is judged firstly, and whether the defrosting time reaches the longest defrosting time or not is judged secondly, and the defrosting state is quitted when one condition is met.
The software implementation of the refrigerator defrosting method is complex, and the actual frosting state of the refrigerator cannot be reflected by limited influence factors due to the fact that the actual state of the refrigerator changes rapidly. Therefore, the calculated defrosting entering judgment conclusion and the defrosting exiting judgment conclusion have larger deviation.
Disclosure of Invention
The invention aims to provide a refrigerator defrosting system, which is characterized in that an induction device is arranged to synchronously induce the thickness of a frost layer on an evaporator, a control module is used for processing data, and a heater is used for heating and defrosting; the frost layer on the evaporator is prevented from being too thick, so that the refrigerating efficiency of the refrigerator is reduced, the power consumption of the refrigerator is increased, the safety is improved by arranging the temperature fuse, and the fire disaster is avoided.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a refrigerator defrosting system, which comprises: the defrosting device comprises a defrosting sensor, an evaporator, a heater and a control module; the evaporator is arranged in the refrigerator;
the defrosting sensor comprises an induction device and an amplifying circuit; wherein, the induction device is fixedly arranged at the upper end of the evaporator; the purpose is to avoid the interference of frequent water drops during defrosting on the output signal; the induction device comprises two polar plates which are arranged in parallel; the sensing device senses the thickness of the frost layer through capacitance values between polar plates which are arranged in parallel; the condensed frost between the two polar plates is the medium of the capacitor, so that the two polar plates form a capacitor, and the capacitance value of the capacitor can be changed along with the difference of the thickness of the frost layer;
the amplifying circuit consists of a triode, a resistor and a capacitor, wherein the triode is connected with the resistor and the capacitor through a capacitor; the amplifying circuit amplifies the signal sensed by the sensing device and transmits the amplified signal to the control module; amplifying the weak signal output by the sensing device into a signal which can be identified and applied by the control module through the amplifying circuit;
the control module is electrically connected with the heater; the control module controls the switch of the electric heater; the heater is installed on the evaporator, and the heater is used for melting the condensed frost layer on the evaporator.
Preferably, the control module adopts a singlechip; when the thickness of the frost layer exceeds a set value, the capacitance value between the polar plates in the induction device reaches a threshold value, and a signal of the induction device is amplified by the amplifying circuit and then transmitted to the control module; the control module controls the heater to heat and defrost the evaporator.
Preferably, the sensing device and the amplifying circuit of the defrosting sensor are mounted at the upper right part of the evaporator after being subjected to waterproof treatment.
Preferably, a temperature fuse is further installed between the heater and the control module in series, after the heater control port of the control module is abnormal, when the temperature of the heater is too high, the temperature fuse is disconnected, the reliability of the system is increased through the temperature fuse, continuous heating is avoided, and fire hazard is caused.
The invention has the following beneficial effects:
the invention synchronously senses the thickness of the frost layer on the evaporator by arranging the sensing device, processes data by the control module and heats and defrosts by the heater; the frost layer on the evaporator is prevented from being too thick, so that the refrigerating efficiency of the refrigerator is reduced, the power consumption of the refrigerator is increased, the safety is improved by arranging the temperature fuse, and the fire disaster is avoided.
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 system block diagram of a defrost sensor;
fig. 2 is a system block diagram of a refrigerator defrosting system.
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. 1-2, the present invention relates to a refrigerator defrosting system, which comprises a defrosting sensor, an evaporator, a heater, and a control module; the evaporator is arranged in the refrigerator;
the defrosting sensor comprises an induction device and an amplifying circuit; wherein, the induction device is fixedly arranged at the upper end of the evaporator; the purpose is to avoid the interference of frequent water drops during defrosting on the output signal; the induction device comprises two polar plates which are arranged in parallel; the sensing device senses the thickness of the frost layer through the capacitance value between the polar plates which are arranged in parallel; the condensed frost between the two polar plates is the medium of the capacitor, so that the two polar plates form a capacitor, and the capacitance value of the capacitor can be changed along with the difference of the thickness of the frost layer;
the amplifying circuit consists of a peripheral circuit consisting of a triode, a resistor and a capacitor; the amplifying circuit amplifies the signal sensed by the sensing device and transmits the amplified signal to the control module; amplifying the weak signal output by the sensing device into a signal which can be identified and applied by the control module through the amplifying circuit;
the control module is electrically connected with the heater; the control module controls the switch of the electric heater; the heater is installed on the evaporator, and the heater is used for melting the condensed frost layer on the evaporator.
Preferably, the control module adopts a singlechip; when the thickness of the frost layer exceeds a set value, the capacitance value between the polar plates in the induction device reaches a threshold value, and a signal of the induction device is amplified by the amplifying circuit and then transmitted to the control module; the control module controls the heater to heat and defrost the evaporator.
Preferably, the sensing device and the amplifying circuit of the defrosting sensor are arranged at the upper right part of the evaporator after being subjected to waterproof treatment; because this location is generally the most severe part of the frost formation, i.e. the thickest layer of frost when frosting, the slowest location when defrosting; and the arrangement of the upper pipeline is noticed during the installation, so that the influence of the dripping water of the pipeline on the output signal during defrosting is avoided.
Preferably, a temperature fuse is further installed between the heater and the control module in series, and after the heater control port of the control module is abnormal and the temperature of the heater is too high, the temperature fuse is disconnected, so that the reliability of the system is improved through the temperature fuse, continuous heating is avoided, and fire hazard is avoided.
The first embodiment is as follows: as shown in fig. 1, the present embodiment is a principle of a defrosting signal detection of a defrosting sensor of a refrigerator defrosting system: the defrosting sensor comprises an induction device and an amplifying circuit; the induction device comprises two polar plates which are arranged in parallel; the condensed frost between the two polar plates is the medium of the capacitor, so that the two polar plates form a capacitor, and the capacitance value of the capacitor can be changed along with the difference of the thickness of the frost layer; along with the continuous change of the frost layer on the induction device, the output signal value of the induction device is continuously changed, namely the frost layer thickness and the induction device signal value are in one-to-one correspondence;
in the frosting process, when the thickness of a frost layer reaches the thickness of systematic defrosting, the sensing device corresponds to a fixed output value which can be used as a judgment value for the control module to enter defrosting; at the moment, the control module controls the heater to heat and defrost the evaporator;
in the defrosting process, along with the continuous reduction of the thickness of a frost layer, the output value of the induction device is also stably reduced; when the frost layer is completely melted, the sensing device corresponds to a fixed output value which can be used as a judgment value for the control module to quit defrosting, and at the moment, the control module controls the heater to stop working.
According to multiple tests, the thickness of the frost layer is divided into 10 grades, wherein 0 grade is a frost-free state and is gradually increased, and 10 grades are an extremely thick state. Since the refrigeration efficiency is affected and the power consumption of the refrigerator is increased when the frost layer is too thick, 8 levels are selected as the determination value for the refrigerator to enter the defrosting state in this embodiment. In the frosting process, the output value of the sensor is gradually increased, when the control panel detects that the output value is 8, the refrigerator system stops refrigerating, the control module is connected with the heater, and the refrigerator enters a defrosting state. In the defrosting process, the output value of the sensor is gradually reduced, and when the control panel detects that the output value is 0, the refrigerator system stops heating and enters a normal refrigeration state.
It should be noted that, in the above system embodiment, each included unit is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
In addition, it can be understood by those skilled in the art that all or part of the steps in the method for implementing the embodiments described above can be implemented by instructing the relevant hardware through a program, and the corresponding program can be stored in a computer-readable storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, or the like.
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 (4)
1. A refrigerator defrosting system characterized by comprising: the defrosting device comprises a defrosting sensor, an evaporator, a heater and a control module; the evaporator is arranged in the refrigerator;
the defrosting sensor comprises an induction device and an amplifying circuit; wherein, the induction device is fixedly arranged at the upper end of the evaporator; the induction device comprises two polar plates which are arranged in parallel; the sensing device senses the thickness of the frost layer through capacitance values between polar plates which are arranged in parallel;
the amplifying circuit consists of a triode, a resistor and a capacitor, wherein the triode is connected with the resistor and the capacitor through a capacitor; the amplifying circuit amplifies the signal sensed by the sensing device and transmits the amplified signal to the control module;
the control module is electrically connected with the heater; the control module controls the switch of the electric heater; the heater is installed on the evaporator, and the heater is used for melting the condensed frost layer on the evaporator.
2. The refrigerator defrosting system according to claim 1, wherein the control module adopts a single chip microcomputer; when the thickness of the frost layer exceeds a set value, the capacitance value between the polar plates in the induction device reaches a threshold value, and a signal of the induction device is amplified by the amplifying circuit and then transmitted to the control module; the control module controls the heater to heat and defrost the evaporator.
3. The refrigerator defrosting system of claim 1 wherein the sensing device and the amplifying circuit of the defrosting sensor are mounted at the upper right portion of the evaporator after being subjected to a water repellent treatment.
4. The defrosting system of a refrigerator as claimed in claim 1, wherein a temperature fuse is further installed between the heater and the control module in series, and the temperature fuse is disconnected when the temperature of the heater is too high after an abnormality occurs at a heater control port of the control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911096828.0A CN110986465A (en) | 2019-11-11 | 2019-11-11 | Refrigerator defrosting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911096828.0A CN110986465A (en) | 2019-11-11 | 2019-11-11 | Refrigerator defrosting system |
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| Publication Number | Publication Date |
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| CN110986465A true CN110986465A (en) | 2020-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911096828.0A Pending CN110986465A (en) | 2019-11-11 | 2019-11-11 | Refrigerator defrosting system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112197488A (en) * | 2020-07-14 | 2021-01-08 | Tcl家用电器（合肥）有限公司 | Evaporator defrosting method and device, refrigerator, computer equipment and storage medium |
| CN113091391A (en) * | 2021-03-24 | 2021-07-09 | 江苏新安电器股份有限公司 | Control circuit for evaporation heater and control system thereof |
| CN115164484A (en) * | 2022-07-25 | 2022-10-11 | 珠海格力电器股份有限公司 | Defrosting structure, refrigerator and defrosting control method |
Citations (6)
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| CN2150502Y (en) * | 1993-04-15 | 1993-12-22 | 韩凤翯 | Device for detecting and controlling frost thickness |
| CN201514223U (en) * | 2009-09-23 | 2010-06-23 | 珠海格力电器股份有限公司 | Frost detector and heat pump-type air conditioner |
| CN108007050A (en) * | 2017-11-21 | 2018-05-08 | 合肥美的电冰箱有限公司 | Defrosting control method, refrigerator and the computer-readable recording medium of refrigerator |
| CN207649205U (en) * | 2017-10-20 | 2018-07-24 | 浙江凯普顿厨房设备有限公司 | A kind of Intelligent refrigerator temperature control system |
| CN108981271A (en) * | 2018-08-27 | 2018-12-11 | 天津商业大学 | A kind of capacitance method intelligent defrosting device and control method |
| CN208688078U (en) * | 2018-05-04 | 2019-04-02 | 青岛海尔股份有限公司 | Defrost component and refrigerator with the defrost component |
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2019
- 2019-11-11 CN CN201911096828.0A patent/CN110986465A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2150502Y (en) * | 1993-04-15 | 1993-12-22 | 韩凤翯 | Device for detecting and controlling frost thickness |
| CN201514223U (en) * | 2009-09-23 | 2010-06-23 | 珠海格力电器股份有限公司 | Frost detector and heat pump-type air conditioner |
| CN207649205U (en) * | 2017-10-20 | 2018-07-24 | 浙江凯普顿厨房设备有限公司 | A kind of Intelligent refrigerator temperature control system |
| CN108007050A (en) * | 2017-11-21 | 2018-05-08 | 合肥美的电冰箱有限公司 | Defrosting control method, refrigerator and the computer-readable recording medium of refrigerator |
| CN208688078U (en) * | 2018-05-04 | 2019-04-02 | 青岛海尔股份有限公司 | Defrost component and refrigerator with the defrost component |
| CN108981271A (en) * | 2018-08-27 | 2018-12-11 | 天津商业大学 | A kind of capacitance method intelligent defrosting device and control method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112197488A (en) * | 2020-07-14 | 2021-01-08 | Tcl家用电器（合肥）有限公司 | Evaporator defrosting method and device, refrigerator, computer equipment and storage medium |
| CN112197488B (en) * | 2020-07-14 | 2022-03-11 | Tcl家用电器（合肥）有限公司 | Evaporator defrosting method and device, refrigerator, computer equipment and storage medium |
| CN113091391A (en) * | 2021-03-24 | 2021-07-09 | 江苏新安电器股份有限公司 | Control circuit for evaporation heater and control system thereof |
| CN115164484A (en) * | 2022-07-25 | 2022-10-11 | 珠海格力电器股份有限公司 | Defrosting structure, refrigerator and defrosting control method |
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Application publication date: 20200410 |
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