CN114484975B - Defrosting control method and refrigerator - Google Patents
Defrosting control method and refrigerator Download PDFInfo
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- CN114484975B CN114484975B CN202210119161.7A CN202210119161A CN114484975B CN 114484975 B CN114484975 B CN 114484975B CN 202210119161 A CN202210119161 A CN 202210119161A CN 114484975 B CN114484975 B CN 114484975B
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- defrosting
- defrosted
- heat exchanger
- evaporator
- refrigerator
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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
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
- F25D21/08—Removing frost by electric heating
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- 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
- F25D29/005—Mounting of control devices
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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 defrosting control method and a refrigerator, and the defrosting control method comprises the following steps: entering a defrosting mode; and switching the valve to enable the exhaust pipe of the compressor to be directly communicated with the inlet of the evaporator, judging whether the evaporator meets the electric heating defrosting condition, if so, switching the valve again, stopping the operation of the compressor, and starting the electric heater to defrost the evaporator. The invention firstly adopts hot air to quickly defrost the evaporator of the refrigerator, and switches the electric heater to defrost the evaporator when the hot air is attenuated, namely, a hot air coupling electric heating defrosting method is adopted, so that defrosting time can be effectively shortened, defrosting efficiency is improved, power consumption required by defrosting is greatly reduced, and the system is more energy-saving.
Description
Technical Field
The invention relates to the technical field of refrigerators, in particular to a defrosting control method and a refrigerator.
Background
The refrigerator defrosting on the current market is mainly carried out by electric heating defrosting, and the method easily causes the problems of high temperature rise of the room, long consumed time, low efficiency, large defrosting increment, high power consumption and the like. The scheme of partly utilizing steam to defrost adopts the cross valve to switch the refrigerant flow direction, under the circumstances that ambient temperature is lower, evaporating pressure and condensing pressure differ less, has the problem that the cross valve can't the switching-over.
Patent CN110940138a proposes to further calculate the difference between the condensing pressure and the evaporating pressure by detecting the condensing temperature and the evaporating temperature, and select to adopt electric heating defrosting or thermal defrosting according to the difference. The problem of cross valve switching-over has been solved to this patent, nevertheless can not evade the above-mentioned problem that meets when adopting single electrical heating to change frost easily.
Disclosure of Invention
The invention provides a defrosting control method and a refrigerator in order to solve the technical problem that a refrigerator evaporator in the prior art is low in defrosting efficiency.
The technical scheme adopted by the invention is as follows:
the invention provides a defrosting control method, which comprises the following steps:
entering a defrosting mode;
and switching the valve to enable the compressor exhaust pipe to be communicated with an inlet of the heat exchanger to be defrosted to carry out hot defrosting, judging whether the heat exchanger to be defrosted meets an electric heating defrosting condition, if so, switching the valve again to control the compressor to stop running, and starting the electric heater to defrost the heat exchanger to be defrosted.
The invention also comprises the following steps: and judging whether the surface temperature of the heat exchanger to be defrosted is higher than a set temperature, and if so, closing the electric heater.
In a first embodiment, the determining whether the heat exchanger to be defrosted meets the electric heating defrosting condition includes: and judging whether the surface temperature of the heat exchanger to be defrosted is reduced and exceeds a preset reduction range, and if so, judging that the electric heating defrosting condition is met.
In a second embodiment, the determining whether the heat exchanger to be defrosted meets the electric heating defrosting condition includes: and judging whether the inlet pressure value of the heat exchanger to be defrosted is reduced and exceeds a second preset reduction amplitude, and if so, judging that the electric heating defrosting condition is met.
And further, after entering a defrosting mode, controlling the compressor to rise to a preset rotating speed, and then executing a step of switching a valve to enable the exhaust pipe of the compressor to be directly communicated with the inlet of the heat exchanger to be defrosted.
The invention also provides a refrigerator which uses the defrosting control method to defrost.
The refrigerator includes: the electric heater is used for heating the heat exchanger to be defrosted, the heat exchanger to be defrosted is an evaporator, a valve is arranged on an exhaust pipeline of a compressor, the evaporator is arranged on an air inlet pipeline of the compressor, a first switching branch is connected with a first outlet of the valve and an inlet of the evaporator, the first switching branch is directly connected with a second outlet of the valve and an inlet of the evaporator and a second switching branch, and the condenser, a filter and a capillary tube are sequentially arranged on the first switching branch along the flowing direction of a refrigerant.
The refrigerator further includes: and a defrosting temperature sensor for detecting the temperature of the evaporator. Or comprises a defrosting temperature sensor for detecting the temperature of the evaporator and a pressure sensor for detecting the inlet pressure value of the evaporator.
Compared with the prior art, the invention firstly adopts hot gas to quickly defrost the evaporator of the refrigerator, and switches the electric heater to defrost the evaporator when the hot gas is attenuated, namely, a hot gas coupling electric heating defrosting method is adopted, so that the defrosting time can be effectively shortened, the defrosting efficiency is improved, the power consumption required by defrosting is greatly reduced, and the system is more energy-saving.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described 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 to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flow chart in an embodiment of the invention;
FIG. 2 is a block diagram of an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
As shown in fig. 1 to 3, the present invention provides a defrosting control method, specifically a defrosting control method for a refrigerator, wherein the refrigerator is a refrigerator defrosted by an electric heater 7 and has a valve for switching the flow direction of exhaust gas of a compressor (it should be noted that the valve may be a switching valve for switching and communicating a first outlet and a second outlet, or may be a four-way valve in the prior art, and the switching valve is specifically exemplified below); the first outlet of the switching valve is communicated with the evaporator 4 through a first switching branch, the first switching branch is mainly provided with a condenser, a capillary tube and other parts, and when the first switching branch is communicated, a refrigerant flows through the condenser, the capillary tube and other parts; the second outlet of the switching valve is directly communicated with the evaporator 4 through the second switching branch, the first switching branch is closed when the second switching branch is opened, the refrigerant directly flows to the evaporator 4 to carry out hot defrosting on the evaporator 4 at the moment, and the defrosting control method specifically comprises the following steps:
the refrigerator enters a defrosting mode, the switching valve 5 acts and communicates with the second switching branch, hot defrosting is carried out on a heat exchanger to be defrosted, namely the evaporator 4, whether the evaporator 4 meets an electric heating defrosting condition is judged, if yes, the switching valve 5 acts and communicates with the first switching branch again (parts such as a condenser and a capillary tube are mainly arranged on the first switching branch), the compressor 1 stops running, the electric heater 7 is started to defrost the evaporator, and if not, the step of judging whether the evaporator meets the electric heating defrosting condition is returned. After the electric heater is started To defrost the evaporator, whether the surface temperature of the evaporator (namely the temperature Td detected by the defrosting sensor) is higher than the set temperature To is judged, if so, the electric heater is turned off, the compressor is turned on, and a dripping and forced cooling mode is entered, or a refrigeration mode is directly entered. The evaporator of the refrigerator is defrosted quickly by adopting hot air firstly, and then the electric heater is used for defrosting the evaporator, namely, a hot air coupling electric heating defrosting method is adopted, so that the defrosting time can be effectively shortened, the defrosting efficiency is improved, the power consumption required by defrosting is greatly reduced, and the system is more energy-saving. And because the electric heater is used for defrosting at the same time, the temperature rise range of the freezing chamber is reduced during defrosting.
Whether the evaporator meets the electric heating defrosting condition or not is judged, and when the evaporator meets the electric heating defrosting condition, two embodiment modes can be adopted at the same time, or only one embodiment mode can be adopted, and when the two embodiment modes are adopted at the same time, the condition that the electric heating defrosting condition is met is triggered as long as one embodiment mode is met, and the two embodiment modes are specifically as follows.
Firstly, judging whether the evaporator meets the electric heating defrosting condition comprises the following steps: and judging whether the temperature reduction amplitude of the surface temperature of the evaporator (namely the temperature Td of the defrosting sensor) in the temperature rising process exceeds a preset temperature reduction amplitude, if so, judging that the electric heating defrosting condition is met, and if not, judging that the electric heating defrosting condition is not met. In the hot defrosting process, high-temperature and high-pressure refrigerant vapor discharged from the compressor exchanges heat with the evaporator through the evaporator to increase the surface temperature of the evaporator. The state of the refrigerant in the heat exchange process is condensed into a gas-liquid mixed phase from superheated steam in sequence to release latent heat, and finally the refrigerant is cooled into a supercooled liquid state. The lower the temperature of the refrigerant returning to the compressor and the lower the temperature of the refrigerant discharged from the compressor, the less and less heat the refrigerant can exchange, resulting in the reduction of the efficiency of the hot defrosting and finally the reduction of the surface temperature of the evaporator. Therefore, when the temperature is reduced to a certain extent, the defrosting efficiency can be effectively improved by switching to the electric heating defrosting.
For example, when the cooling amplitude is 0.5 degree or 1 degree (the cooling amplitude can be set according to actual conditions), it is determined that the cooling amplitude exceeds the preset cooling amplitude, and at the moment, the electric heater defrosting condition is met, and the electric heater can be used for heating to improve defrosting efficiency.
Secondly, judging whether the evaporator meets the electric heating defrosting condition comprises the following steps: judging whether the inlet pressure value Pd of the evaporator is reduced and exceeds a second preset reduction amplitude (the reduction amplitude can be set according to the actual condition), if so, judging that the electric heating defrosting condition is met; if not, judging that the electric heating defrosting condition is not met. Because the pressure value can rise or keep when hot gas is enough, if the pressure value of the evaporator inlet begins to drop, and when the pressure value is reduced by a certain range, the pressure is insufficient, the heat of the refrigerant drops, and at the moment, the electric heating defrosting is switched to effectively improve the defrosting efficiency.
In order to improve defrosting efficiency, after the refrigerator enters a defrosting mode, the compressor is controlled to rise to a preset rotating speed, specifically the rotating speed of the highest gear, and the refrigerator enters a strong cooling mode.
As shown in fig. 2 and 3, the invention also provides a refrigerator, which performs defrosting by using the defrosting control method. The refrigerator specifically includes: the air conditioner comprises an electric heater 7, a condenser 2, a compressor 1, a valve (specifically a three-way switching valve 5) arranged on an exhaust pipeline of the compressor 1, an evaporator 4 arranged on an air inlet pipeline of the compressor 1, a refrigerating fan 8 corresponding to the evaporator 7, a first switching branch connected with a first outlet of the switching valve 5 and an inlet of the evaporator 4, a second switching branch connected with a second outlet of the switching valve 5 and an inlet of the evaporator, and the condenser 2, a filter 6 and a capillary 3 are sequentially arranged on the first switching branch along the flow direction of a refrigerant. The electric heater 7 is used for defrosting of the evaporator, and can increase the surface temperature of the evaporator. And the valve of the refrigerator is a switching valve, so that the problem of reversing of a conventional hot defrosting four-way valve is solved.
In order to realize the control, the method further comprises the following steps: a defrosting temperature sensor 9 for detecting the surface temperature of the evaporator 4, and a pressure sensor 10 for detecting the inlet pressure value of the evaporator. As shown in fig. 2 and 3, the defrosting temperature sensor 9 may be separately provided, and when the evaporator inlet pressure value needs to be determined, the defrosting temperature sensor 9 and the pressure sensor 10 need to be provided at the same time.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (9)
1. A defrosting control method is characterized by comprising the following steps:
entering a defrosting mode;
switching a valve to enable a compressor exhaust pipe to be communicated with an inlet of a heat exchanger to be defrosted for hot defrosting, judging whether the heat exchanger to be defrosted meets an electric heating defrosting condition, if so, switching the valve again, controlling the compressor to stop running, and starting an electric heater to defrost the heat exchanger to be defrosted;
judging whether the heat exchanger to be defrosted meets the electric heating defrosting condition comprises the following steps: and judging whether the surface temperature of the heat exchanger to be defrosted is reduced and exceeds a preset reduction range, and if so, judging that the electric heating defrosting condition is met.
2. The defrosting control method according to claim 1, further comprising the step of: and judging whether the surface temperature of the heat exchanger to be defrosted is higher than a set temperature, and if so, turning off the electric heater.
3. The defrosting control method of claim 1, wherein determining whether the heat exchanger to be defrosted satisfies an electrically heated defrosting condition comprises: and judging whether the inlet pressure value of the heat exchanger to be defrosted is reduced and exceeds a second preset reduction amplitude, and if so, judging that the electric heating defrosting condition is met.
4. The defrosting control method of claim 1, wherein after entering the defrosting mode, the compressor is controlled to increase to a preset rotating speed, and then the step of switching the valve to enable the compressor exhaust pipe to be directly communicated with the inlet of the heat exchanger to be defrosted is executed.
5. A refrigerator characterized by being defrosted using the defrosting control method of any one of claims 1 to 4.
6. The refrigerator of claim 5, comprising: and the electric heater is used for heating the heat exchanger to be defrosted, and the heat exchanger to be defrosted is an evaporator.
7. The refrigerator of claim 5, comprising: and the defrosting temperature sensor is used for detecting the temperature of the heat exchanger to be defrosted.
8. The refrigerator of claim 5, comprising: and the pressure sensor is used for detecting the inlet pressure value of the heat exchanger to be defrosted.
9. The refrigerator of claim 6, comprising: the condenser, the compressor, the valve of setting on compressor exhaust duct sets up on compressor admission line the evaporimeter is connected the first switching branch road of valve first export and evaporimeter entry is connected valve second export and evaporimeter entry and second switch the branch road, first switch is gone up and is followed the refrigerant flow direction and has set gradually condenser, filter and capillary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210119161.7A CN114484975B (en) | 2022-02-08 | 2022-02-08 | Defrosting control method and refrigerator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210119161.7A CN114484975B (en) | 2022-02-08 | 2022-02-08 | Defrosting control method and refrigerator |
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| Publication Number | Publication Date |
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| CN114484975A CN114484975A (en) | 2022-05-13 |
| CN114484975B true CN114484975B (en) | 2022-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115325755B (en) * | 2022-08-11 | 2023-08-08 | 珠海格力电器股份有限公司 | Defrosting control method, refrigerating unit and refrigerating equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4265092A (en) * | 1979-12-26 | 1981-05-05 | Tyler Refrigeration Corporation | Refrigerated display case using air defrost with supplemental heater |
| JP2010210223A (en) * | 2009-03-12 | 2010-09-24 | Mitsubishi Heavy Ind Ltd | Air conditioner |
| CN102032730A (en) * | 2010-11-25 | 2011-04-27 | 佛山市中格威电子有限公司 | Hot-gas bypass defrosting system for variable-frequency air conditioner |
| CN105180568A (en) * | 2015-10-28 | 2015-12-23 | 合肥美菱股份有限公司 | Defrosting control method of refrigerator |
| CN106524605A (en) * | 2016-08-31 | 2017-03-22 | 广东上贝制冷设备有限公司 | Defrosting system and method utilizing four-way reversing valve control hot-gas reversing defrosting mode and electric heating tube defrosting mode for air-cooled refrigerator |
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2022
- 2022-02-08 CN CN202210119161.7A patent/CN114484975B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4265092A (en) * | 1979-12-26 | 1981-05-05 | Tyler Refrigeration Corporation | Refrigerated display case using air defrost with supplemental heater |
| JP2010210223A (en) * | 2009-03-12 | 2010-09-24 | Mitsubishi Heavy Ind Ltd | Air conditioner |
| CN102032730A (en) * | 2010-11-25 | 2011-04-27 | 佛山市中格威电子有限公司 | Hot-gas bypass defrosting system for variable-frequency air conditioner |
| CN105180568A (en) * | 2015-10-28 | 2015-12-23 | 合肥美菱股份有限公司 | Defrosting control method of refrigerator |
| CN106524605A (en) * | 2016-08-31 | 2017-03-22 | 广东上贝制冷设备有限公司 | Defrosting system and method utilizing four-way reversing valve control hot-gas reversing defrosting mode and electric heating tube defrosting mode for air-cooled refrigerator |
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| CN114484975A (en) | 2022-05-13 |
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