CN111306885A - Air-cooling full-refrigerating box return air defrosting control method - Google Patents
Air-cooling full-refrigerating box return air defrosting control method Download PDFInfo
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- CN111306885A CN111306885A CN202010138461.0A CN202010138461A CN111306885A CN 111306885 A CN111306885 A CN 111306885A CN 202010138461 A CN202010138461 A CN 202010138461A CN 111306885 A CN111306885 A CN 111306885A
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- defrosting
- compressor
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- temperature
- opening times
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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
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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 relates to a return air defrosting control method of an air-cooled full-refrigerated container, which comprises the following steps of: s1) the controller calculates the continuous operation time t1 of the compressor, if t1 is more than or equal to ta, the compressor stops operating and the step S5 is carried out; if t1< ta, the compressor continues to operate until the refrigerating compartment reaches the shutdown temperature, the compressor stops operating and step S2 is performed; s2) calculating the opening times K0 of the refrigerating chamber door in the first defrosting period, and comparing the opening times K0 with a defrosting target time table of the opening times to obtain the defrosting target time tm of the current opening times; s3) detecting the accumulated running time t2 of the compressor in the first defrosting period, and if t2 is larger than or equal to tm, performing S5; if t2< tm, go to step S4; s4) the fan keeps running until the temperature T0 of the defrosting temperature sensing head is more than or equal to Tmb, the step S6 is carried out; s5), the fan keeps running until the temperature T0 of the defrosting temperature sensing head is more than or equal to Ta, and the step S6 is carried out; s6) stopping the fan. The invention carries out defrosting after the compressor is shut down, not only utilizes hot return air to defrost, but also utilizes residual cold of the evaporator to continuously cool the interior of the refrigerator, and is beneficial to reducing the energy consumption of the whole refrigerator.
Description
Technical Field
The invention relates to the technical field of refrigerator control methods, in particular to a method for controlling air return and defrosting of an air-cooled full-refrigerating box.
Background
In the defrosting and frostless refrigerator with circulating air, the fan of the refrigerator is used for forcibly circulating cold air generated by the evaporator to cool the refrigerator when the compressor of the refrigerator is used for refrigerating, and the fan of the refrigerator is used for washing a frost layer on the evaporator by using high-temperature gas in the refrigerating chamber when the compressor of the refrigerator is stopped. The significance lies in that: because the temperature of the refrigerating chamber is generally in the range of 2-10 ℃, and the temperature of the evaporator of the refrigerator is generally below 0 ℃ when the compressor is stopped, the high-temperature gas in the refrigerating chamber can be used for defrosting the evaporator. Secondly, the residual cold of the evaporator can be used for refrigerating the refrigerating chamber by utilizing the difference between the temperature of the evaporator and the temperature of the refrigerating chamber when the refrigerator is stopped. However, in the prior art, the defrosting operation of the evaporator is to defrost before the compressor is started, the temperature difference between the evaporator and the inside of the box is small, and the temperature rise in the box is accelerated instead of blowing air at the moment, so that the energy consumption test is not favorable.
Disclosure of Invention
The invention aims to provide a method for controlling air return defrosting of an air-cooled full-refrigeration box, which improves the energy consumption of the whole machine while ensuring that an evaporator defrosts cleanly by running two different defrosting periods after a compressor is shut down so as to overcome the defects of the prior art.
The technical scheme for solving the technical problem is as follows: a return air defrosting control method for an air-cooled full-refrigerated container is characterized in that an evaporator cavity and a circulating air channel are arranged in the box body, an evaporator and a defrosting temperature sensing head are arranged in the evaporator cavity, and a fan is arranged in the circulating air channel to enable air in the box to circulate between a refrigerating chamber and the evaporator, and the method comprises the following steps:
s1) the controller calculates the continuous operation time t1 of the compressor, if t1 is more than or equal to ta, the compressor stops operating and the step S5 is carried out; if t1< ta, the compressor continues to operate until the refrigerating compartment reaches the shutdown temperature, the compressor stops operating and step S2 is performed;
s2) calculating the opening times K0 of the refrigerating chamber door in the first defrosting period, and comparing the opening times K0 with a defrosting target time table of the opening times to obtain the defrosting target time tm of the current opening times;
s3) detecting the accumulated running time t2 of the compressor in the first defrosting period, and if t2 is larger than or equal to tm, performing S5; if t2< tm, go to step S4;
s4) the fan keeps running until the temperature T0 of the defrosting temperature sensing head is more than or equal to Tmb, the step S6 is carried out;
s5), the fan keeps running until the temperature T0 of the defrosting temperature sensing head is more than or equal to Ta, and the step S6 is carried out;
s6) stopping the fan.
In the air-cooling full-refrigerating box return air defrosting control method, Tmb is less than Ta.
When step S4 or S5 is performed, the operation of the compressor is stopped.
Ta is a fixed value which is not changed along with the change of the set temperature of the refrigerating chamber, and Tmb is a variable value which is changed along with the change of the set temperature gear of the refrigerating chamber.
After the end of step S5, the compressor is not operated for a time delay t 3.
The invention has the beneficial effects that:
the invention can be used for defrosting by utilizing hot return air when the compressor is stopped, and the temperature difference between the evaporator and the inner box is larger, so that the residual cold of the evaporator can be utilized to continuously cool the inner box, and the energy consumption of the whole refrigerator can be reduced.
Drawings
Fig. 1 is a sectional view of the box structure of the air-cooled full-refrigerated container return air defrosting control method of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. "plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, a fixed connection unless expressly specified or limited otherwise. Can also be detachably connected or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the air-cooled full-refrigeration box disclosed by the invention comprises a box body and a door body, wherein an evaporator cavity and a circulating air duct are arranged on the back of the box body, a refrigeration chamber is arranged at the front part of the box body, a multi-layer shelf is arranged at the upper part of the refrigeration chamber, and a plurality of drawers are arranged at the lower part of the refrigeration chamber, wherein the upper drawer is an ice greenhouse drawer, and the lower two drawers are fruit and vegetable boxes. The evaporator cavity is internally provided with an evaporator 1 and a defrosting temperature sensing head, the circulating air duct is internally provided with a fan 2 to ensure that air in the box circulates between the refrigerating chamber and the evaporator, and because the air cooling box is a fully refrigerated air cooling box, the temperature in the box is generally set to be more than 0 ℃, and the return air temperature is higher, an electric heater for defrosting is not arranged on the evaporator, but the defrosting of the evaporator is realized through the return air of the refrigerating chamber. The return air defrosting control method of the refrigerator comprises two subprograms of large-operation period defrosting and small-operation period defrosting, wherein the large-operation period defrosting is also called a first defrosting period and refers to a period of forced defrosting after conditions such as enough long accumulated starting time are met. In this period, the defrosting temperature of the evaporator reaches a higher level through a longer forced return air circulation, thereby ensuring the frost layer is removed completely. The defrosting conditions of the period are as follows: firstly, the accumulated running time of the compressor reaches the target defrosting time (the accumulated running time t2 of the compressor in the first defrosting period) and the door opening times meet the requirement, and secondly, the compressor is continuously operated for a period of time (the compressor operation time t 1). When the temperature T0 of the defrosting temperature sensing head is more than or equal to Ta, defrosting is finished, and the next first defrosting period is started. In addition, in order to ensure that the defrosting water on the evaporator can be completely removed when the defrosting of the first defrosting period is finished, the controller presets the time t3 for the defrosting water to drip, so that water drops on the evaporator can smoothly flow down, the compressor can immediately start to refrigerate after defrosting is finished, and the water drops do not completely flow down to form stubborn ice.
The small-operation period defrosting is return air defrosting during each compressor on-off period in the first defrosting period, namely the first defrosting period. In the period, the fan continues to operate after the compressor is stopped every time, return air of the refrigerating chamber to the evaporator cavity, raise the temperature of the evaporator to defrost until the temperature T0 of the defrosting temperature sensing head is more than or equal to Tmb, and then the small-operation period defrosting is stopped.
In the large-operation-period defrosting process, the temperature value of the defrosting exiting temperature is fixed and unchanged, for example, the defrosting exiting temperature is always 5 ℃ no matter what the temperature gear of the refrigerator is set. In the defrosting operation in a small operation period, Tmb is a variable value which changes along with the change of the set temperature gear of the refrigerating chamber, namely the higher the control temperature set by the refrigerating chamber is, the higher the defrosting exit temperature of the evaporator is correspondingly, for example: the controller firstly obtains a gear setting of temperature setting, then obtains the temperature of the defrosting temperature sensing head, when the temperature setting gear is set to be 2-4 ℃, when the temperature T0 of the defrosting temperature sensing head rises to 1 ℃, the fan stops running and defrosting is finished, when the gear is set to be 5-8 ℃, the temperature of the defrosting temperature sensing head rises to 2 ℃, the fan stops running and defrosting is finished.
The defrosting exit temperature is usually set to be more than or equal to 1 ℃, so that the evaporator can be ensured not to be provided with solid ice, the reliability is ensured, meanwhile, the defrosting exit temperature of return air defrosting after the compressor is shut down every time is set to be hooked with the gear, the gear setting is high, the defrosting exit temperature is high, and the fan can fully utilize the residual cooling of the evaporator to cool the inside of the refrigerator under the condition that the temperature difference between the evaporator and the inside of the refrigerator is large.
The following is a control embodiment, comprising the steps of:
s1) the controller calculates the continuous operation time t1 of the compressor, if t1 is more than or equal to 2 hours, the compressor stops operating and the step S5 is carried out; if t1 is less than 2 hours, the compressor continues to operate until the refrigerating chamber reaches the shutdown temperature, the compressor stops operating and the step S2 is carried out;
s2) calculating the opening times K0 of the refrigerating chamber door in the first defrosting period, and comparing the opening times K0 with a defrosting target time table of the opening times to obtain the defrosting target time tm of the current opening times;
s3) detecting the accumulated running time t2 of the compressor in the first defrosting period, and if t2 is larger than or equal to tm, performing S5; if t2< tm, go to step S4;
s4) the fan keeps running until the temperature T0 of the defrosting temperature sensing head is more than or equal to Tmb, the step S6 is carried out; wherein Tmb is different with different set temperature gears of the refrigerating chamber and ranges from 1 to 2 ℃.
S5), the fan keeps running until the temperature T0 of the defrosting temperature sensing head is more than or equal to 5 ℃, and the step S6 is carried out;
s6) stopping the fan.
When step S4 or S5 is performed, the operation of the compressor is stopped.
After the end of step S5, the compressor is not operated for a time delay t 3. t3 was 5 minutes.
The opening times of the refrigerating chamber door are obtained through a door switch signal, after each first defrosting period is finished, the continuous operation time t1 of the compressor, the opening times K0 of the refrigerating chamber door and the accumulated operation time t2 of the compressor are cleared, and the next first defrosting period is recalculated. The defrosting target time table of the door opening times is shown in a table 1;
TABLE 1
| Opening times Km of door of refrigerating chamber in first defrosting period | Defrosting target time tm |
| ≤1 | 18 hours |
| 1＜Km≤8 | 10 hours |
| ＞8 | 6 hours |
It is known that when the door is opened more frequently, the hot air outside the refrigerator is introduced into the refrigerator cabinet more, and therefore, the amount of frost formed on the evaporator is more, and it is necessary to shorten the defrosting target time. Therefore, in the defrosting target time table of the opening times, the opening times of the refrigerating chamber door are divided into three stages by natural numbers K1 and K2, wherein K1 is less than K2, and the defrosting target time tm is decreased along with the increase of the opening times of the door. As described above, the "defrosting target time table of the door opening times" divides the opening times of the refrigerating chamber door into three stages by natural numbers 1 and 8, and the defrosting target times are 18 hours, 10 hours, and 6 hours, respectively, as the opening times of the door increase. As an improvement, the defrosting target time table of the door opening times can also be natural numbers K1 and K2. . . Kn-1 and Kn divide the opening times of the refrigerating chamber door into n +1 grades, K1 is more than K2. . . Kn-1 < Kn, and as the number of door openings increases, the defrosting target time tm decreases, as shown in Table 2 below.
TABLE 2
| Opening times Km of door of refrigerating chamber in first defrosting period | Defrosting target time tm |
| Km≤K1 | tm1 hours |
| K1＜Km≤K2 | tm2 hours |
| 。。。 | 。。。 |
| Kn-1＜Km≤Kn | tm (n-1) hour |
| Kn＜Km | tmn hours |
In steps S4 and S5, if the fan is continuously operated for more than 90 minutes and the defrosting temperature sensing head does not reach the temperature condition that the fan stops operating, the controller forcibly quits defrosting and the fan stops operating.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents, and all changes that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (5)
1. A return air defrosting control method for an air-cooled full-refrigerated container is characterized in that an evaporator cavity and a circulating air channel are arranged in the box body, an evaporator and a defrosting temperature sensing head are arranged in the evaporator cavity, and a fan is arranged in the circulating air channel to enable air in the box to circulate between a refrigerating chamber and the evaporator, and the method comprises the following steps:
s1) the controller calculates the continuous operation time t1 of the compressor, if t1 is more than or equal to ta, the compressor stops operating and the step S5 is carried out; if t1< ta, the compressor continues to operate until the refrigerating compartment reaches the shutdown temperature, the compressor stops operating and step S2 is performed;
s2) calculating the opening times K0 of the refrigerating chamber door in the first defrosting period, and comparing the opening times K0 with a defrosting target time table of the opening times to obtain the defrosting target time tm of the current opening times;
s3) detecting the accumulated running time t2 of the compressor in the first defrosting period, and if t2 is larger than or equal to tm, performing S5; if t2< tm, go to step S4;
s4) the fan keeps running until the temperature T0 of the defrosting temperature sensing head is more than or equal to Tmb, the step S6 is carried out;
s5), the fan keeps running until the temperature T0 of the defrosting temperature sensing head is more than or equal to Ta, and the step S6 is carried out;
s6) stopping the fan.
2. The method for controlling the return air and defrosting of the air-cooled full-refrigerated container as claimed in claim 1, wherein: tmb < Ta.
3. The method for controlling the return air defrosting of the air-cooled full-refrigerated container as claimed in claim 2, wherein: when step S4 or S5 is performed, the operation of the compressor is stopped.
4. The method for controlling the return air and defrosting of the air-cooled full-refrigerated container as claimed in claim 3, wherein: ta is a fixed value which is not changed along with the change of the set temperature of the refrigerating chamber, and Tmb is a variable value which is changed along with the change of the set temperature gear of the refrigerating chamber.
5. The method for controlling the return air defrosting of the air-cooled full-refrigerated container as claimed in claim 3, further comprising the steps of: after the end of step S5, the compressor is not operated for a time delay t 3.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010138461.0A CN111306885A (en) | 2020-03-03 | 2020-03-03 | Air-cooling full-refrigerating box return air defrosting control method |
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| CN202010138461.0A CN111306885A (en) | 2020-03-03 | 2020-03-03 | Air-cooling full-refrigerating box return air defrosting control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112460905A (en) * | 2020-11-19 | 2021-03-09 | 珠海格力电器股份有限公司 | Refrigerator return air defrosting control method and device and air-cooled refrigerator |
| CN114646178A (en) * | 2020-12-17 | 2022-06-21 | 青岛海尔生物医疗股份有限公司 | Defrosting control method and refrigeration equipment |
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2020
- 2020-03-03 CN CN202010138461.0A patent/CN111306885A/en active Pending
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112460905A (en) * | 2020-11-19 | 2021-03-09 | 珠海格力电器股份有限公司 | Refrigerator return air defrosting control method and device and air-cooled refrigerator |
| CN112460905B (en) * | 2020-11-19 | 2022-02-25 | 珠海格力电器股份有限公司 | Refrigerator return air defrosting control method and device and air-cooled refrigerator |
| CN114646178A (en) * | 2020-12-17 | 2022-06-21 | 青岛海尔生物医疗股份有限公司 | Defrosting control method and refrigeration equipment |
| CN114646178B (en) * | 2020-12-17 | 2023-09-15 | 青岛海尔生物医疗股份有限公司 | Defrosting control method and refrigeration equipment |
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Application publication date: 20200619 |