CN111076460A - Defrosting control method and refrigerator - Google Patents
Defrosting control method and refrigerator Download PDFInfo
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- CN111076460A CN111076460A CN201911368278.3A CN201911368278A CN111076460A CN 111076460 A CN111076460 A CN 111076460A CN 201911368278 A CN201911368278 A CN 201911368278A CN 111076460 A CN111076460 A CN 111076460A
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- temperature
- defrosting
- control method
- evaporator
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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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
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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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Defrosting Systems (AREA)
Abstract
The invention discloses a defrosting control method and a refrigerated cabinet, wherein the defrosting control method comprises the following steps: when the refrigerating system is in a refrigerating and cooling mode, the refrigerating and cooling time is recorded, and the inlet temperature T of the heat exchanger is detected1Outlet temperature T2Air inlet temperature T3And the temperature T of the air outlet4When T is1If < 0, the defrosting judgment is made, and if T is less than 01If > 0, continuing to detect T1(ii) a When T is2Is more than 0 and the time t of refrigeration and temperature reductionFortuneNot less than a first preset time value t1When T is2Is less than 0 and the time t of refrigeration and temperature reductionFortuneNot less than the second preset time value t2When or when T3－T4When the temperature is less than a preset value K, defrosting is started; when the surface temperature of the heat exchanger reaches a preset temperature TIs provided withAnd then, the defrosting is finished. Compared with the prior art, the invention can detect whether the evaporator is frosted, so that the defrosting judgment is more accurate, and the refrigeration systemThe condition of wrong defrosting or untimely defrosting can not occur, thereby achieving the purposes of accurately controlling defrosting and saving energy.
Description
Technical Field
The invention relates to the field of refrigeration equipment, in particular to a defrosting control method and a refrigerated cabinet.
Background
When the refrigerator in the market is defrosted, a time interval natural defrosting mode is adopted, namely defrosting is carried out once at intervals, the defrosting termination condition is temperature termination or time termination, during defrosting, a compressor of a unit stops refrigerating, a fan of an air curtain cabinet continuously operates, an evaporator is heated by return air at about 14 ℃, and the temperature of the evaporator continuously rises to about 11 ℃, so that the defrosting effect is achieved. However, in the defrosting process of the existing refrigerator, the temperature in the refrigerator can be greatly increased to about 11 ℃; importantly, in some occasions with low temperature and humidity, the evaporator has no frosting condition, and the natural defrosting mode still using the time interval can cause ineffective defrosting; meanwhile, in some occasions with high temperature and humidity, the frosting condition of the evaporator is serious, and at the moment, the natural defrosting mode still used at the time interval may cause that the frost cannot be removed completely. Obviously, the time interval defrosting mode can not adapt to a plurality of kinds, so that the actual temperature in the refrigerator is higher than the temperature of the commodity requirement, and the commodity storage time is shortened, therefore, the defrosting mode of the existing refrigerator can not meet the actual use requirement of a user, the problem of wrong defrosting or untimely defrosting exists, the energy is wasted, and the economic loss is caused for the user.
Disclosure of Invention
The invention provides a defrosting control method and a refrigerator, which effectively solve the technical problem that the conventional refrigeration equipment is mistakenly defrosted or is not defrosted in time.
The technical scheme adopted by the invention is as follows: a defrost control method comprising: when the refrigeration system is in a refrigeration cooling mode, recording the refrigeration cooling time, and detecting the operating temperature of a heat exchanger with an evaporation function; judging whether defrosting judgment is needed or not according to the operating temperature; and if the defrosting is required, judging whether defrosting is required according to the operation temperature and/or the refrigerating and cooling time.
Further, the operating temperatures include an inlet temperature T1, an outlet temperature T2, an inlet temperature T3, and an outlet temperature T4 of the heat exchanger.
Further, judging whether defrosting is needed according to the operating temperature specifically includes: when the inlet temperature T1 is < 0, a defrosting determination is made.
Further, judging whether defrosting is needed according to the operating temperature specifically includes: when the inlet temperature T1 is greater than 0, the inlet temperature T1 is continuously detected.
Further, the specific step of judging whether defrosting is needed includes: when the outlet temperature T2 is more than 0 and the refrigerating and cooling time tport is more than or equal to a first preset time value T1, defrosting is started.
Further, the specific step of judging whether defrosting is needed includes: when the outlet temperature T2 is less than 0 and the refrigerating and cooling time tfortune is more than or equal to a second preset time value T2, defrosting is started.
Further, the specific step of judging whether defrosting is needed includes: and when the air inlet temperature T3-the air outlet temperature T4 is less than a preset value K, defrosting is started.
And further, defrosting is carried out by adjusting the rotating speed of a fan of the heat exchanger with the evaporation function.
And further, monitoring the surface temperature of the heat exchanger when defrosting is started, and finishing defrosting when the surface temperature of the heat exchanger reaches a preset temperature T.
A refrigerated cabinet comprises a refrigerating system, and the refrigerated cabinet adopts the defrosting control method to carry out defrosting control on the refrigerating system.
Compared with the prior art, the invention judges whether the heat exchanger (evaporator) with the evaporation function needs to be defrosted according to the operation temperature, judges the frosting condition of the evaporator according to the operation temperature and the operation time of the evaporator when the defrosting judgment of the evaporator is detected, and starts defrosting according to the frosting condition, so that the defrosting judgment is more accurate, the condition of wrong defrosting or untimely defrosting of a refrigerating system can not occur, and the aims of accurately controlling defrosting and saving energy sources are achieved.
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 schematic block diagram of the construction of a refrigeration system in an embodiment of the present invention;
fig. 2 is a flow chart of a defrosting control method in an embodiment of the 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.
The invention has proposed the defrosting control method of a refrigerated cabinet and applied the refrigerated cabinet of this method, as the schematic diagram of the structure of the refrigerating system of the invention shown in fig. 1, this refrigerating system includes the evaporator 1, wherein the evaporator 1 includes the import (the coolant flows into the end) and exports (the coolant flows out of the end), there is the first temperature sensing bulb 11 at the import of the evaporator 1, there is the second temperature sensing bulb 12 at the exit of the evaporator 1, the first, second temperature sensing bulb is used for detecting the coolant temperature at import and exit of the evaporator separately; still include air intake and air outlet at evaporimeter 1, be equipped with fan 13 in one side of air intake, fan 13 provides the wind for the inside coil pipe of evaporimeter, the wind blows and exchanges heat with the refrigerant from the air intake, cold wind blows out and enters into the freezer from the air outlet, the refrigerant temperature of evaporimeter 1 import then is less than the refrigerant temperature of evaporimeter export, be equipped with third temperature sensing package 14 at the air intake of evaporimeter 1, still be equipped with fourth temperature sensing package 15 at the air outlet of evaporimeter 1, third, fourth temperature sensing package is used for detecting the temperature of the air outlet of evaporimeter 1 and the temperature of air intake respectively.
As shown in fig. 2, a flow diagram of the defrosting control method in the present invention is that when the refrigeration system is in the refrigeration cooling mode, the refrigeration cooling time is recorded, the operating temperature of the heat exchanger for evaporation is detected, and whether defrosting determination is needed is determined according to the operating temperature; and if the defrosting is required, judging whether defrosting is required according to the operation temperature and/or the refrigerating and cooling time.
The invention mainly judges whether the evaporator frosts according to the inlet temperature of the evaporator; and if the evaporator is frosted, judging whether the evaporator starts to defrost or not according to the temperatures of an air inlet and an air outlet of the evaporator or the refrigerating running time of the evaporator.
Specifically, in a first step, the inlet temperature T of the evaporator is detected based on the first bulb 111Judging whether the evaporator is frosted or not, and when the inlet temperature T is detected1When the temperature value is less than 0 ℃, judging that the evaporator is frosted, and carrying out next defrosting judgment;
secondly, defrosting is judged, whether the evaporator meets at least one of the following conditions or not is detected, then the evaporator is judged to need defrosting, and (1) the third temperature bulb 14 detects the temperature T of the air inlet of the evaporator3The fourth temperature bulb 15 detects the temperature T of the air outlet of the evaporator4When T is3－T4Is less than a preset value K; (2) when the temperature value T of the outlet of the evaporator is detected by the second temperature sensing bulb 1220 and the refrigerating running time t of the evaporator monitored at the same timeFortuneNot less than a first preset time value t1(ii) a (3) When the temperature value T of the outlet of the evaporator is detected by the second temperature sensing bulb 122The refrigerating running time t of the evaporator is monitored at the same time and is less than or equal to 0FortuneNot less than the second preset time value t2。
And thirdly, if yes, the system performs defrosting on the evaporator, if defrosting is started, and the rotating speed of the fan is adjusted to perform defrosting.
Fourthly, detecting whether the surface temperature of the evaporator reaches a preset temperature value TIs provided with。
If yes, the system finishes defrosting.
Generally, during defrosting, the rotating speed of a fan is increased to increase the air quantity, and a large amount of heat load passes through an evaporator to accelerate defrosting progress; preset value of temperature TIs provided withTypically between 10 ℃ and 12 ℃.
Further, when the detected inlet temperature T of the evaporator is detected1At a temperature of more than 0 deg.C, the outlet temperature T of the evaporator is at this time2Including only two cases, T2Not more than 0 ℃ or T2Greater than 0 deg.C, but the refrigerant temperature at the inlet of the evaporator is less than the refrigerant temperature at the outlet of the evaporator, as determined by the operating characteristics of the evaporator, so T2The temperature is less than or equal to 0 ℃ and does not exist in practice; and when T is2When the temperature is higher than 0 ℃, the actual temperature of the evaporator is higher than 0 ℃, and the frosting condition is not met, so the invention only detects the inlet temperature T of the evaporator according to the detected temperature1The evaporator frosting phenomenon can be judged when the temperature is less than 0 ℃.
It should be noted that the second step is to judge the frosting condition of the evaporator when T3－T4When the value of the refrigerant quantity is less than the preset value K, the refrigeration condition of the evaporator is proved to be poor, and further the frosting of the evaporator is proved to be serious, so that the system can be controlled to defrost according to the point; and the inlet temperature T of the evaporator1< 0 ℃ when the outlet temperature T of the evaporator is2When the temperature is higher than 0 ℃, the temperature difference of the refrigerant inlet and the refrigerant outlet of the evaporator is relatively large, the refrigeration effect is relatively good, and if the monitored running time t of the evaporator is in the conditionFortuneNot less than a first preset time value t1Judging that the evaporator reaches the defrosting condition according to the running time of the evaporator; similarly, the inlet temperature T of the evaporator1< 0 ℃ when the outlet temperature T of the evaporator is2When the temperature is less than 0 ℃, the temperature difference of the refrigerant inlet and the refrigerant outlet of the evaporator is relatively small, the refrigeration effect is relatively poor, and if the operation of the evaporator is monitored under the conditionLine time tFortuneNot less than the second preset time value t2The evaporator can be judged to have reached the defrosting condition according to the running time of the evaporator.
Further, besides the mode of installing the thermal bulb at the inlet and/or the outlet of the evaporator to directly detect the inlet and outlet temperature of the evaporator, in other embodiments, the refrigerant temperature at the inlet and/or the outlet of the evaporator can be obtained by detecting the pressure value at the inlet and/or the outlet of the evaporator.
According to the defrosting control method, whether the evaporator is frosted or not is judged by detecting the inlet temperature of the evaporator, and the frosting condition of the evaporator is automatically judged according to the outlet temperature of the evaporator and the inlet air temperature and the outlet air temperature of the evaporator, so that a defrosting strategy is reasonably worked out, and when defrosting is carried out, the rotating speed and the air volume of a fan are increased, a large amount of heat load passes through the evaporator, the defrosting progress is accelerated, and the temperature in the refrigerated cabinet can be kept in the range required by a user to the maximum extent.
The invention provides a refrigerated cabinet, which applies the defrosting control method provided by the invention.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A defrost control method, comprising: when the refrigeration system is in a refrigeration cooling mode, recording the refrigeration cooling time, and detecting the operating temperature of a heat exchanger with an evaporation function;
judging whether defrosting judgment is needed or not according to the operating temperature;
and if the defrosting is required, judging whether defrosting is required according to the operation temperature and/or the refrigerating and cooling time.
2. Defrost control method according to claim 1, characterized in that the operating temperature packageInlet temperature T of the heat exchanger1Outlet temperature T2Air inlet temperature T3And the temperature T of the air outlet4。
3. The defrost control method of claim 2, wherein determining whether a defrost determination is required based on the operating temperature specifically comprises: when inlet temperature T1If < 0, the defrosting determination is made.
4. The defrost control method of claim 2, wherein determining whether a defrost determination is required based on the operating temperature further comprises: when inlet temperature T1If the temperature is more than 0, the inlet temperature T is continuously detected1。
5. The defrost control method of claim 2, wherein determining whether defrosting is required specifically comprises: when the outlet temperature T is2Is more than 0 and the time t of refrigeration and temperature reductionFortuneNot less than a first preset time value t1At that time, defrosting is started.
6. The defrost control method of claim 2, wherein determining whether defrosting is required specifically comprises: when the outlet temperature T is2Is less than 0 and the time t of refrigeration and temperature reductionFortuneNot less than the second preset time value t2At that time, defrosting is started.
7. The defrost control method of claim 2, wherein determining whether defrosting is required specifically comprises: when the temperature T of the air inlet is lower3-outlet temperature T4And when the temperature is less than the preset value K, defrosting is started.
8. Defrost control method according to any of claims 5-7, characterized in that defrosting is performed by adjusting the rotational speed of the fan of the evaporation heat exchanger.
9. According to claim 1The defrosting control method is characterized in that the surface temperature of the heat exchanger is monitored when defrosting is started, and when the surface temperature of the heat exchanger reaches a preset temperature value TIs provided withAnd then, the defrosting is finished.
10. A refrigerated cabinet including a refrigeration system, wherein the refrigerated cabinet employs a defrost control method as claimed in any one of claims 1 to 9 for defrost control of the refrigeration system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911368278.3A CN111076460B (en) | 2019-12-26 | 2019-12-26 | Defrosting control method and refrigerator |
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| CN201911368278.3A CN111076460B (en) | 2019-12-26 | 2019-12-26 | Defrosting control method and refrigerator |
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| CN111076460B CN111076460B (en) | 2021-06-08 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112460868A (en) * | 2020-11-20 | 2021-03-09 | 浙江工业大学 | Air source heat pump multi-mode accurate defrosting start-stop management method and system |
| CN112460906A (en) * | 2020-11-20 | 2021-03-09 | 浙江工业大学 | Efficient defrosting start-stop management method for refrigerating unit |
| CN112460867A (en) * | 2020-11-20 | 2021-03-09 | 浙江正理生能科技有限公司 | Air source heat pump defrosting start-stop management system and method |
| CN112524871A (en) * | 2020-11-20 | 2021-03-19 | 浙江瑞雪制冷设备科技有限公司 | Internet of things defrosting start-stop management system and method for refrigerating device |
| CN114909860A (en) * | 2022-06-01 | 2022-08-16 | 青岛海容商用冷链股份有限公司 | Intelligent defrosting method, defrosting control system and refrigerator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112460868A (en) * | 2020-11-20 | 2021-03-09 | 浙江工业大学 | Air source heat pump multi-mode accurate defrosting start-stop management method and system |
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| CN112524871A (en) * | 2020-11-20 | 2021-03-19 | 浙江瑞雪制冷设备科技有限公司 | Internet of things defrosting start-stop management system and method for refrigerating device |
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| CN114909860A (en) * | 2022-06-01 | 2022-08-16 | 青岛海容商用冷链股份有限公司 | Intelligent defrosting method, defrosting control system and refrigerator |
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