WO2018121592A1

WO2018121592A1 - Constant-temperature refrigerator and control method therefor

Info

Publication number: WO2018121592A1
Application number: PCT/CN2017/118941
Authority: WO
Inventors: 朱小兵; 陶海波; 刘建如; 姬立胜; 聂圣源; 刘昀曦
Original assignee: 青岛海尔股份有限公司
Priority date: 2016-12-28
Filing date: 2017-12-27
Publication date: 2018-07-05
Also published as: CN106766532A; CN106766532B

Abstract

A constant-temperature refrigerator, comprising: a refrigerator body, an evaporator (50), a second air passage (502), and a fan (51), the refrigerator body being defined as having at least one cooling compartment; a side of the cooling compartment is provided with a first air passage (31), while an evaporator chamber (501) is located at a rear portion of the cooling compartment, the second air passage (502) being provided at a rear portion of the first air passage (31) and being in communication with the evaporator chamber (501); the fan (51) may guide air from the evaporator chamber (501) into the first air passage (31) and may circulate air between the second air passage (502) and the evaporator chamber (501), a fan covering device (60) being provided between the first air passage (31) and the fan (51).

Description

Constant temperature refrigerator and control method thereof

The present application claims priority to Chinese Patent Application Serial No. No. No. No. No. No. No. No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No

Technical field

The invention relates to the field of household appliances, in particular to a constant temperature refrigerator and a control method thereof.

Background technique

In the prior art, a refrigerator generally refers to a single door, a double door double temperature, a three door three temperature, a cabinet type multi-door and the like, and generally has an independent freezing room and an outer door of the refrigerating room, so as to be separated according to different storage temperatures. Store. The refrigeration principle of this refrigerated freezer is divided into direct cooling and air cooling. The direct cooling type refrigeration system usually uses a solenoid valve to control the flow of the refrigerant, and supplies the refrigerant to the evaporators of the respective refrigerating (freezing) chambers to cool the spaces to the required temperature. Air-cooled chilling and freezing requires the installation of a corresponding air duct to supply air to each space.

The constant temperature refrigerator provides cold air to the chamber of the lesion through the evaporator and the air duct. Since the inside of the evaporator contains moisture, frost is easily generated on the surface of the evaporator of the lower temperature and the air passage of the refrigerator compartment, and the evaporator is located in the freezing chamber, so when it is knotted When the frost is serious, it will directly affect the cooling effect in the freezer compartment. For the refrigerating compartment air duct, it realizes the circulation of cold air from the evaporator to the refrigerating compartment. When the internal frosting blocks the air duct, it will affect the refrigerating compartment. The cooling effect, so the constant temperature refrigerator needs to periodically defrost the evaporator and the refrigerating compartment air duct.

At present, when the refrigerator is heated by the heating wire during defrosting, the temperature in the evaporator chamber rises, causing the temperature of the refrigeration compartment to fluctuate greatly.

Summary of the invention

It is an object of the present invention to provide a thermostatic refrigerator in which the temperature of the refrigerating compartment of the thermostatic refrigerator is small, and precise temperature control can be achieved.

In order to achieve the above object, the present invention provides a thermostatic refrigerator comprising: a casing, the casing defining at least one refrigerating compartment, and one side of the at least one refrigerating compartment is provided with a fluid communication therewith a duct; an evaporator disposed in an evaporator chamber of the tank, the evaporator chamber being located at a rear of the at least one refrigerating compartment; and a second duct disposed at a rear of the first duct and The evaporator chamber is connected to the fan; the fan can introduce the wind from the evaporator into the first air passage to cool the at least one refrigerating compartment, and the fan can also make the wind in the second air duct and the evaporator chamber Between the two, a fan shielding device is disposed between the first air duct and the fan, and the fan shielding device is opened or closed to allow or restrict the airflow from the fan to enter the first air passage.

As a further improvement of an embodiment of the present invention, the at least one refrigerating compartment includes a refrigerating compartment and a freezing compartment from top to bottom, and the evaporator is disposed at a rear of the freezing compartment, and the refrigerating compartment is disposed at a rear portion In the third air passage, the fan is capable of introducing wind from the evaporator into the third air passage to cool the refrigerating chamber.

As a further improvement of an embodiment of the present invention, a first damper is disposed between the fan and the third air passage, and the first damper is opened or closed to control cooling of the refrigerating chamber.

As a further improvement of an embodiment of the present invention, the constant temperature refrigerator is selectively switchable between at least three cooling modes, the first cooling mode, the fan shielding device is opened, and the fan makes the wind from the evaporator Entering the freezing chamber from the first air passage; in a second cooling mode, the first damper is opened and the fan shielding device is closed, and the fan causes wind to enter the refrigerating chamber from the third air passage; In three cooling modes, the first damper is opened and the fan shutter is opened, the fan simultaneously entering wind from the first duct into the freezer compartment and from the third duct into the cold compartment.

As a further improvement of an embodiment of the present invention, a second damper is disposed between the fan and the second air duct, a heating device is disposed at the bottom of the evaporator, the heating device is opened, and the first damper is open to The evaporator is defrosted.

As a further improvement of an embodiment of the present invention, the constant temperature refrigerator is selectively switchable between at least two modes. In the first mode, the fan shielding device is opened, and the fan makes the wind from the evaporator The first air duct enters the at least one refrigerating compartment; in the second mode, the second damper is opened and the heating device is turned on, and the fan circulates wind between the second duct and the evaporator chamber.

The present invention also provides a control method of a thermostat refrigerator, the thermostat refrigerator comprising: a tank body defining a refrigerating compartment and a freezing compartment disposed from top to bottom, one side of the freezing compartment being provided with a first air duct in fluid communication; an evaporator disposed in an evaporator chamber of the tank, the evaporator chamber being located at a rear portion of the freezing chamber; and a second air passage disposed at a rear portion of the first air duct and The evaporator chamber is connected; the third air passage is disposed at one side of the refrigerating chamber and is in fluid communication with the refrigerating chamber; the fan is disposed at an upper portion of the evaporator, and the lower portion of the evaporator is provided with a heating device, the first air passage and A fan shielding device is disposed between the fans, and the fan shielding device is opened or closed to allow or restrict the airflow from the fan to enter the first air channel, and the thermostatic control method includes the following steps:

S1, determining whether the refrigerator satisfies the condition for starting defrosting, and if the condition for starting defrosting is satisfied, the process proceeds to step S2;

S2, running steps before defrost, controlling the compressor to be turned off and the fan to be turned on, so that the cold air is circulated between the refrigerating chamber and the evaporator chamber, and after the first preset time, the process proceeds to step S3;

S3. The defrosting start step controls the compressor to be turned off, the fan is turned on, and the heating device is turned on, so that the airflow is circulated between the second air passage and the evaporator chamber, and it is judged whether the detected defrosting temperature TD is greater than the defrosting temperature TDoff. If it is greater, proceed to step S4;

S4. The defrosting end step controls the compressor to be turned off, the fan is turned off, and the heating device is turned off. After the second preset time, the process proceeds to step S5.

S5. After the first stage of defrosting, only the compressor is controlled to be turned on, and after the third preset time, the process proceeds to step S6;

S6. After the second stage of defrosting, the compressor is controlled to be turned on and the fan is turned on, so that the airflow is circulated between the second air passage and the evaporator chamber, and it is determined whether the detected defrosting temperature TD is less than or equal to a preset temperature TD. -set, if less than or equal to the end of the defrost control to start the cooling control.

As a further improvement of an embodiment of the present invention, before the defrosting control is ended, the following steps are further included: S7, third stage operation after defrosting, controlling compressor opening and fan opening, so that cold air is between the refrigerating chamber and the evaporator chamber Cycle through the fourth preset time.

As a further improvement of an embodiment of the present invention, after step S7 and before ending the defrosting control, the following steps are further included: S8, fourth stage operation after defrosting, controlling compressor opening and fan opening, so that cold air is simultaneously in the refrigerating chamber and evaporating Circulation between the chambers, between the freezer compartment and the evaporator chamber.

As a further improvement of an embodiment of the present invention, starting the cooling control includes the steps of: first controlling the compressor to be turned on and the fan to be turned on, so that the cold air is circulated between the refrigerating chamber and the evaporator chamber, when the detected temperature of the refrigerating chamber is less than Equal to the temperature of the refrigerating and cooling shutdown, enter the first stage of refrigeration and refrigeration operation, control the compressor to open and the fan to open, so that the airflow circulates between the second air duct and the evaporator chamber, when the detected defrosting temperature of the evaporator is less than The detected temperature of the freezer compartment enters the second stage of refrigeration and refrigeration operation, controls the compressor to be turned on and the fan is turned on, so that the airflow is circulated between the second air duct and the evaporator chamber, when the detected temperature of the freezer compartment is less than or equal to The temperature of the chilled cooling is turned off, the cooling control is over, and the compressor and fan are controlled to shut down.

As a further improvement of an embodiment of the present invention, in the step S3, the rotation speed of the fan is controlled to be 50% or less of the fan rotation speed in other steps.

Compared with the prior art, the beneficial effects of the present invention are: the refrigeration compartment of the constant temperature refrigerator of the present invention is provided with a double air passage to isolate the defrosting air passage from the cooling air supply passage, and the defrosting temperature has little influence on the cooling temperature. Thereby, the temperature fluctuation of the refrigerating compartment is small, so that precise temperature control can be performed. The refrigerator is controlled by the control method of the present invention, the defrosting efficiency is high, and the temperature fluctuation of the refrigerating compartment is small.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a partially cutaway perspective view of a refrigerator in a preferred embodiment of the present invention.

Figure 2 is a schematic view of the refrigerator of Figure 1 in a refrigerated mode.

3 is a schematic view of the refrigerator of FIG. 1 in a freezing mode.

4 is a schematic view of the refrigerator of FIG. 1 in a refrigerating and freezing simultaneous cooling mode.

Figure 5 is a schematic view of the refrigerator of Figure 1 in a defrost mode.

Fig. 6 is a flow chart showing the defrosting control in the constant temperature control method of the refrigerator of Fig. 1.

Fig. 7 is a flow chart showing the refrigeration control in the constant temperature control method of the refrigerator of Fig. 1.

detailed description

The invention will be described in detail below in conjunction with the specific embodiments shown in the drawings. However, the embodiments are not intended to limit the invention, and the structural, method, or functional changes made by those skilled in the art in accordance with the embodiments are included in the scope of the present invention.

As shown in FIG. 1 to FIG. 2, in a preferred embodiment of the present invention, the preferred embodiment discloses a thermostat refrigerator including a cabinet, the cabinet defining at least two refrigerating compartments, respectively, a refrigerating compartment 20 And the freezing compartment 30, in which the refrigerating compartment 20 and the freezing compartment 30 are generally disposed from top to bottom. In this embodiment, the direction in which the refrigerating compartment 20 and the freezing compartment 30 are arranged from top to bottom is defined as the height direction of the refrigerator, and the direction in which the user opens the refrigerator facing the refrigerator door and faces away from the refrigerator door is defined as the front-rear direction of the refrigerator, perpendicular to the height. The direction and thickness directions are defined as the width direction of the refrigerator. The refrigerator further has an evaporator 50 and a blower 51. The evaporator 50 is disposed in the evaporator chamber 501 at the rear of the cabinet freezer compartment 30, and the blower 51 is disposed in the upper portion of the evaporator 50 in the evaporator chamber 501, and the lower portion of the evaporator 50 is disposed. The heating device 55 is preferably a heating wire. The evaporator 50 is further provided with a defrosting sensor 53 for detecting the temperature of the evaporator, and a freezing sensor 33 is provided in the freezing compartment 30 for detecting the temperature of the freezing compartment. The evaporator 50 may be any one of known evaporators such as a fin evaporator, a wire tube evaporator, an inflation evaporator, and a tube tube evaporator. In the present embodiment, the refrigerator constitutes a compression refrigeration cycle system by a compressor (not shown), a condenser (not shown), and an evaporator 50, and the fan 51 introduces cold air from the evaporator 50 into the freezing compartment 30 and the refrigerating compartment 20. During operation, the compressor pushes the refrigerant circulation, and the refrigerant entering the evaporator 50 absorbs heat and evaporates, and the fan 51 is sent to the corresponding refrigerating compartment through the air duct.

In the present embodiment, the rear portion of the freezing compartment 30 is provided with a first air passage 31, that is, a freezing air inlet duct, and the fan 51 introduces cold air from the evaporator 50 from the first air passage 31 into the freezing chamber 30. A fan shielding device 60 is disposed between the first air channel 31 and the fan 51. The fan shielding device 60 is operatively opened or closed, and the fan shielding device 60 is opened to allow the cold air to enter the first air channel 31 from the fan 51, and the cold air passes through the fan. The upper and lower sides of the shielding device 60 enter the first air channel 31 and then enter the freezing chamber 30. After the circulation of the freezing chamber 30, the air is circulated to the evaporator 50 through the air return port at the bottom of the freezing chamber; the fan shielding device 60 is closed to block the cold air fan 51. Enter the first air passage 31.

The second air duct 502 is disposed along the front and rear sides of the refrigerator in the front and rear direction of the refrigerator, and the second air duct 502 is connected to the evaporator chamber 501. The third air passage 23 is located at the rear of the air duct 31 and located at the upper portion of the second air duct 502. The third air passage 23 communicates with the refrigerating chamber 20, and the first damper 21 is disposed between the fan 51 and the third air passage 23, and the first damper is provided. 21 is opened, allowing the cold air to enter the third air passage 23 from the blower 51, the cold air entering the third air passage 23 and then entering the refrigerating chamber 20, returning to the evaporator 50 after the refrigeration cycle of the refrigerating chamber 20; the second damper 52 is closed, blocking The cold air fan 51 enters the third air passage 23. A second damper 52 is disposed between the fan 51 and the second air duct 502, and the second damper 52 is opened to allow the cold air to enter the second air duct 502 from the fan 51, and the cold air enters the second air duct 502 and then enters the evaporator chamber 501; The second damper 52 is closed to block the cold air from entering the second air duct 502 from the blower 51.

By controlling the opening and closing of the fan shielding device 60, the first damper 21 and the second damper 52, the refrigerator can be switched between various modes, that is, the refrigerator can realize the refrigerating and cooling mode, the refrigerating and cooling mode, the refrigerating and freezing simultaneous cooling mode, Four functions, such as the defrosting mode, will be described in detail below.

Referring to FIG. 2, the refrigerating and cooling mode: controlling the second damper 52 and the fan shielding device 60 to be closed, the first damper 21 is opened, and the cold air from the evaporator 50 is blown to the refrigerating chamber 20 via the first damper 21 as indicated by an arrow in the figure. After returning to the evaporator 50 through the refrigerating compartment refrigeration cycle.

Referring to FIG. 3, the refrigerating and cooling mode: the first damper 21 and the second damper 52 are controlled to be closed, and the fan shielding device 60 is opened, as shown by the arrow in the figure, after the cold air from the evaporator 50 is blown out through the upper and lower sides of the fan shielding device 60. The air blowing port of the first air passage 31 is blown into the freezing chamber 30, and after circulating in the freezing chamber, it is circulated to the evaporator 50 through the bottom air return port.

Referring to FIG. 4, the refrigerating and freezing simultaneous cooling mode: controlling the first damper 21 and the fan shielding device 60 to open, the second damper 52 is closed, and the cold air from the evaporator 50 is blown to the refrigerating chamber via the first damper 21 as indicated by an arrow in the figure. 20, after returning to the evaporator 50 through the refrigerating compartment refrigeration cycle, while the cold air from the evaporator 50 is blown out through the upper and lower sides of the fan shielding device 60, and then blown into the freezing compartment 30 through the air blowing port of the first air duct 31, and is frozen. The chamber 30 is returned to the evaporator 50 after the cycle.

Referring to FIG. 5, the defrosting mode: controlling the first damper 21 and the fan shielding device 60 to be closed, controlling the second damper 52 to open, and the heating device 55 to operate, as shown by the arrow in the figure, the fan 51 driving the hot gas in the evaporator chamber 501, the first The two air ducts 502 circulate.

According to the design of the air duct described above, the present invention also relates to a freezing constant temperature control method including a defrosting control and a cooling control, as follows:

Referring to FIG. 6, the defrosting control includes the following steps:

Here, the conditions for starting the defrosting, such as detecting the cumulative running time of the compressor of the refrigerator, detecting the number of times the door is opened, and the like.

S2, the operation step before defrost, controlling the compressor to be turned off and the fan 51 to be turned on, so that the cold air is circulated between the refrigerating chamber 20 and the evaporator chamber 501, and after the first preset time, the process proceeds to step S3;

Preferably, in the present embodiment, cold air is circulated between the refrigerating chamber 20 and the evaporator chamber 501 by the first damper 21 being opened, the second damper 52 being closed, and the fan shutter 60 being closed. The first preset time is T1, that is, the fan running time is 3 to 5 minutes, and the refrigerating return air defrosting is performed. This time can be preset before the refrigerator is shipped from the factory, and the evaporator is pre-defined by using a slightly higher temperature in the refrigerating chamber.

S3, the defrosting start step, controlling the compressor to be turned off, the fan 51 is turned on, and the heating device 55 is turned on, so that the airflow circulates between the second air duct 502 and the evaporator chamber 501, and it is judged whether the temperature TD detected by the defrosting sensor 53 is greater than The temperature TDoff of the defrosting shutdown, if it is greater, the process proceeds to step S4;

Preferably, in the embodiment, the airflow is circulated between the second air duct 502 and the evaporator chamber 501 by the first damper 21 being closed, the second damper 52 being opened, and the fan shielding device 60 being closed; the temperature of the defrosting shutdown is the refrigerator The preset temperature zone, if the preset temperature range is reached, the heating wire is turned off, and the range of the temperature can also be set according to the actual situation. In addition, in this step, the fan 51 is operated at a lower rotation speed, so that the heat generated by the heating wire can be evenly distributed in the evaporator chamber 501, thereby speeding up the defrosting speed. Preferably, the rotation speed of the fan 51 in the step is cooling. 50% or less of the fan speed during operation.

S4, the defrosting end step, controlling the compressor to be turned off, the fan 51 is turned off, and the heating device 55 is turned off, and after the second preset time, the process proceeds to step S5;

Preferably, the first damper 21 is closed, the second damper 52 is closed, and the fan shielding device 60 is closed in this step to prevent cold and heat convection from occurring due to temperature differences between the respective air passages. The second preset time is T2, that is, the compressor protection time is 3 to 5 minutes, which can be preset before the refrigerator is shipped from the factory.

Preferably, in this embodiment, the compressor is separately opened, the fan 51 is closed, the first damper 21 is closed, the second damper 52 is closed, and the fan shielding device 60 is closed, and the third preset time is T3, that is, the compressor Separate cooling time is 5 to 7 minutes, which can be preset before the refrigerator is shipped from the factory.

S6. After the second stage of defrosting, the compressor is turned on and the fan 51 is turned on, so that the airflow is circulated between the second air duct 502 and the evaporator chamber 501, and it is determined whether the temperature TD detected by the defrosting sensor 53 is less than or equal to The preset temperature TD-set, if less than or equal to, proceeds to step S7;

Preferably, in this embodiment, in this step, the airflow is circulated between the second air duct 502 and the evaporator chamber 501 by controlling the first damper 21 to be closed, the second damper 52 to be opened, and the fan shielding device 60 to be closed, so that The hot gas generated by the heating wire is carried away by the evaporator 50.

S7. After the third stage of defrosting, the compressor is controlled to be turned on and the fan 51 is turned on, so that the cold air is circulated between the refrigerating chamber 20 and the evaporator chamber 501, and after the fourth preset time, the process proceeds to step S8;

Preferably, in this embodiment, in the step, the cold air is circulated between the refrigerating chamber 20 and the evaporator chamber 501 by controlling the opening of the first damper 21, the closing of the second damper 52, and the closing of the fan shielding device 60, wherein the third pre-cycle Set the time to T3, that is, chill out the cooling time of 3 to 5 minutes, which can be preset before the refrigerator leaves the factory.

S8, the fourth stage of operation after defrosting, controlling the opening of the compressor and the opening of the fan 51, so that the cold air is simultaneously circulated between the refrigerating chamber 20 and the evaporator chamber, between the freezing chamber and the evaporator chamber, and the entire defrosting control process is completed. , you can start cooling.

Preferably, in this embodiment, in this step, by controlling the opening of the first damper 21, the closing of the second damper 52, and the opening of the fan shielding device 60, the cooling air is simultaneously between the refrigerating chamber 20 and the evaporator chamber 501, the freezing chamber 30, and the evaporation. The circulation between the chambers 501 is performed, and when the entire defrosting control process is completed, the compressor can be controlled to be closed, and the next time the compressor is turned on, the cooling control is started.

Next, the process of the refrigeration control will be specifically described. Referring to FIG. 7, the refrigeration control includes the following steps: first, refrigerating and cooling are performed at the start of cooling, that is, first, the compressor is turned on and the fan 51 is turned on, so that the cold air is in the refrigerating chamber 20 and the evaporator. Circulation between the chambers 501, when the temperature of the refrigerating chamber 20 detected by the refrigerating temperature sensor is less than or equal to the temperature of the refrigerating and cooling off, entering the first stage of refrigerating and cooling operation, controlling the compressor to be turned on and the fan 51 to be turned on, so that the air flow is in the second wind The circulation between the channel 502 and the evaporator chamber 501 is performed. When the temperature of the evaporator 50 detected by the defrosting sensor 53 is lower than the temperature of the freezing chamber 30 detected by the freezing temperature sensor 33, the second-stage refrigerating and cooling operation is entered to control the compressor. The opening and the fan 51 are turned on to circulate the airflow between the second air duct 502 and the evaporator chamber 501. When the temperature of the freezing chamber 30 detected by the freezing temperature sensor 33 is less than or equal to the temperature of the freezing and cooling shutdown, the cooling control ends, and the control is completed. The compressor and fan 51 are turned off. Preferably, in the embodiment, in the cooling control step, the cold air is circulated between the refrigerating chamber 20 and the evaporator chamber 501 by controlling the opening of the first damper 21, the closing of the second damper 52, and the closing of the fan shielding device 60, by controlling The first damper 21 is closed, the second damper 52 is open, and the fan shutter 60 is closed to circulate airflow between the second air duct 502 and the evaporator chamber 501, by controlling the first damper 21 to close, the second damper 52 to close, and the fan The screening device 60 is opened to circulate cold air between the freezing compartment 30 and the evaporator chamber 501.

The freezing constant temperature control method of the above refrigerator has small temperature fluctuation of the freezing compartment, high defrosting efficiency, no frequent defrosting to increase energy consumption, and effective cooling of the condensed frost.

It should be understood that, although the description is described in terms of embodiments, the embodiments are not intended to be construed as a single. The technical solutions in the embodiments may also be combined as appropriate to form other embodiments that can be understood by those skilled in the art.

The series of detailed descriptions set forth above are merely illustrative of the possible embodiments of the present invention, and are not intended to limit the scope of the present invention. Changes are intended to be included within the scope of the invention.

Claims

A constant temperature refrigerator characterized in that it comprises:

a tank body, wherein the tank body defines at least one refrigerating compartment, and one side of the at least one refrigerating compartment is provided with a first air duct in fluid communication therewith;

An evaporator disposed in an evaporator chamber of the tank, the evaporator chamber being located at a rear portion of the at least one refrigeration compartment;

a second air passage disposed at a rear portion of the first air passage and communicating with the evaporator chamber;

a fan capable of introducing wind from the evaporator into the first air passage to cool at least one refrigerating compartment, and the fan is further configured to circulate wind between the second air duct and the evaporator chamber, the A fan shielding device is disposed between the air duct and the fan, and the fan shielding device is opened or closed to allow or restrict the airflow from the fan to enter the first air passage.
The constant temperature refrigerator according to claim 1, wherein the at least one refrigerating compartment includes a refrigerating compartment and a freezing compartment from top to bottom, and the evaporator is disposed at a rear of the freezing compartment, the refrigerating A third air duct is disposed at the rear of the chamber, and the fan is capable of introducing wind from the evaporator into the third air passage to cool the refrigerating chamber.
The constant temperature refrigerator according to claim 2, wherein a first damper is disposed between the fan and the third air passage, and the first damper is opened or closed to control cooling of the refrigerating chamber.
The constant temperature refrigerator according to claim 3, wherein the constant temperature refrigerator is selectively switchable between at least three cooling modes, the first cooling mode, the fan shielding device is opened, and the fan is self-contained The wind of the evaporator enters the freezer compartment from the first air duct; in the second cooling mode, the first damper opens and the fan shutter is closed, the fan causes wind to enter the air from the third air duct a refrigerating compartment; a third cooling mode in which the first damper is opened and the fan shading device is opened, the fan simultaneously bringing wind from the first duct into the freezing compartment and entering from the third duct Cold storage room.
The constant temperature refrigerator according to claim 1, wherein a second damper is disposed between the fan and the second air duct, a heating device is disposed at the bottom of the evaporator, the heating device is opened, and the first damper is opened. The evaporator can be defrosted.
The constant temperature refrigerator according to claim 5, wherein said constant temperature refrigerator is selectively switchable between at least two modes, in the first mode, said fan shielding device is opened, said fan is self-evaporating The wind enters the at least one refrigerating compartment from the first air duct; in the second mode, the second damper is opened and the heating device is turned on, and the fan causes the wind to be in the second air duct and the evaporator chamber Circulation.
A method for controlling a constant temperature refrigerator, the thermostat refrigerator comprising: a tank body defining a refrigerating chamber and a freezing chamber disposed from top to bottom, wherein one side of the freezing chamber is provided with a first fluid communication therewith a duct; an evaporator disposed in an evaporator chamber of the tank, the evaporator chamber being located at a rear of the freezing chamber; and a second duct disposed at a rear of the first duct and with the evaporator chamber a third air passage is disposed at one side of the refrigerating chamber and is in fluid communication with the refrigerating chamber; a fan is disposed at an upper portion of the evaporator, a heating device is disposed at a lower portion of the evaporator, and a fan is disposed between the first air duct and the fan a shielding device, the fan shielding device being opened or closed to allow or restrict airflow from the fan into the first air channel, wherein the thermostatic control method comprises the following steps:

S1, determining whether the refrigerator satisfies the condition for starting defrosting, and if the condition for starting defrosting is satisfied, the process proceeds to step S2;

S2, running steps before defrost, controlling the compressor to be turned off and the fan to be turned on, so that the cold air is circulated between the refrigerating chamber and the evaporator chamber, and after the first preset time, the process proceeds to step S3;

S3. The defrosting start step controls the compressor to be turned off, the fan is turned on, and the heating device is turned on, so that the airflow is circulated between the second air passage and the evaporator chamber, and it is judged whether the detected defrosting temperature TD is greater than the defrosting temperature TDoff. If it is greater, proceed to step S4;

S4, the defrosting end step, controlling the compressor to be turned off, the fan to be turned off, and the heating device to be turned off, and after the second preset time, the process proceeds to step S5;

S5. After the first stage of defrosting, only the compressor is controlled to be turned on, and after the third preset time, the process proceeds to step S6;

S6. After the second stage of defrosting, the compressor is controlled to be turned on and the fan is turned on, so that the airflow is circulated between the second air passage and the evaporator chamber, and it is determined whether the detected defrosting temperature TD is less than or equal to a preset temperature TD. -set, if less than or equal to the end of the defrost control to start the cooling control.
The control method according to claim 7, characterized in that, before ending the defrosting control, the following steps are further included: S7, third stage operation after defrosting, control of compressor opening and fan opening, cooling air in the refrigerating chamber and evaporation The chambers are cycled through the fourth preset time.
The control method according to claim 8, wherein after step S7 and before ending the defrosting control, the method further comprises the steps of: S8, fourth stage operation after defrosting, controlling compressor opening and fan opening, so that the cooling air is simultaneously Circulation between the refrigerating compartment and the evaporator chamber, between the freezing compartment and the evaporator chamber.
The control method according to claim 7, wherein the start of the cooling control comprises the steps of: first controlling the compressor to be turned on and the fan to be turned on, so that the cold air is circulated between the refrigerating chamber and the evaporator chamber, when the detected refrigerating The temperature of the chamber is less than or equal to the temperature of the refrigeration and refrigeration shutdown, enters the first stage of refrigeration and refrigeration operation, controls the compressor to be turned on and the fan is turned on, so that the airflow is circulated between the second air passage and the evaporator chamber, when the detected evaporator The defrosting temperature is less than the detected temperature of the freezer compartment, enters the second stage of refrigeration and refrigeration operation, controls the compressor to be turned on and the fan is turned on, so that the airflow circulates between the second air duct and the evaporator chamber, when the detected freezer compartment The temperature is less than or equal to the temperature at which the refrigeration is closed, the refrigeration control ends, and the compressor and fan are controlled to shut down.
The control method according to claim 7, wherein in the step S3, the rotation speed of the fan is controlled to be 50% or less of the fan rotation speed in the other step.