WO2016173226A1

WO2016173226A1 - Freezing and refrigerating device and defrosting control method thereof

Info

Publication number: WO2016173226A1
Application number: PCT/CN2015/093402
Authority: WO
Inventors: 马坚; 陶海波; 刘建如; 戚斐斐; 姬立胜
Original assignee: 青岛海尔股份有限公司
Priority date: 2015-04-29
Filing date: 2015-10-30
Publication date: 2016-11-03
Also published as: EP3290836A1; CN104807279B; US20170241696A1; CN104807279A; EP3290836A4; EP3290836B1

Abstract

A freezing and refrigerating device and defrosting control method thereof. The freezing and refrigerating device (1) comprises a container body (100) and a door body (200). The container body (100) is provided with at least one storage chamber, an air supply path for supplying a cooling air flow to the storage chamber, an air return path for the air flow flowing from the storage chamber to flow therethrough, a cooling chamber (40) communicating with the air supply path and the air return path and accommodating an evaporator (41), a fan (42) and a defrosting heater (43), and an air exhaust path (50) communicating the cooling chamber (40) and a surrounding space. The air supply path and the air exhaust path (50) are respectively provided with an air supply door and an air exhaust door (51) therein to selectively open and/or close the air supply path and the air exhaust path (50). The defrosting control method comprises the steps of receiving a defrosting signal, activating the defrosting heater (43) located on the evaporator (41), closing the air supply door and opening the air exhaust door (51) to exhaust hot air generated during defrosting to the surrounding space.

Description

Freezing and freezing device and defrosting control method thereof

Technical field

The present invention relates to an evaporator defrosting technique, and more particularly to a refrigerating and freezing apparatus and a defrosting control method thereof.

Background technique

Usually, after a period of operation, a refrigerating device such as a refrigerator will have a frost on the surface of the evaporator. The frost layer affects the heat exchange between the evaporator and the air in the refrigerator, reducing the efficiency of the evaporator cooling, so the refrigerator must be defrosted after running for a period of time.

In the prior art, the evaporator is usually defrosted by heating. However, the hot air generated by the defrosting process cannot be discharged to the outside of the refrigerator. On the one hand, the hot air enters the interior of the storage compartment of the refrigerator through the air inlet, which causes the temperature in the storage room to rise, which affects the preservation and freezing time of the food. On the other hand, when the storage compartment is cooled again after the defrosting, it takes a long time to restore the temperature before the defrosting, which additionally increases the energy consumption of the refrigerator.

Summary of the invention

An object of the first aspect of the present invention is to overcome at least one of the deficiencies of the prior art refrigerating and freezing apparatus, and to provide a refrigerating and refrigerating apparatus capable of discharging hot air generated by a defrosting process to the outside of the refrigerating and refrigerating apparatus, thereby avoiding a storage compartment The indoor temperature rises due to the defrosting heat, which prolongs the storage time of the food and reduces the energy consumption of the freezer.

A further object of the first aspect of the present invention is to shorten the defrosting time of the refrigerating and freezing apparatus and to improve the defrosting effect thereof.

Another further object of the first aspect of the invention is to achieve an automatic stop of the evaporator defrosting.

An object of the second aspect of the present invention is to provide a defrosting control method for a refrigerating and freezing apparatus.

According to a first aspect of the present invention, there is provided a refrigerating and freezing apparatus comprising a case and a door body pivotally coupled to the case, wherein the case interior defines:

At least one storage room for storing items;

a supply air passage configured to supply a cooling airflow to the at least one storage compartment;

Returning to the air passage, configured to flow airflow from the at least one storage compartment;

a cooling chamber that communicates with the supply air passage and the return air passage, and is internally provided with a pair An evaporator that cools air flowing in from the return air passage, a fan that drives air flowing in the cooling chamber toward the supply air passage, and a defrosting heater provided on the evaporator;

Discharging an air passage connecting the cooling chamber and the environmental space for direct discharge of air in the cooling chamber to the environmental space;

A supply damper and a discharge damper are respectively disposed in the supply air passage and the discharge air passage to selectively conduct and/or block the supply air passage and the discharge air passage.

Optionally, an exhaust pump for causing air in the cooling chamber to flow toward the environmental space is further disposed in the exhaust air passage.

Optionally, one end of the discharge air passage communicating with the cooling chamber is located downstream of the fan in the air flow direction.

Optionally, the at least one storage compartment comprises a refrigerating compartment and a freezing compartment disposed above and below, the cooling compartment being located behind the freezing compartment and passing through a rear cover of the freezing compartment The freezing compartments are separated.

Optionally, the supply air passage includes a refrigerating inlet duct located behind the refrigerating compartment and a refrigerating air inlet opening on the rear cover of the freezing compartment;

The supply damper includes a refrigerated intake damper disposed in the refrigerating inlet duct and a refrigerated inlet damper disposed at the refrigerating inlet.

Optionally, the return air passage includes a refrigerating return air passage extending from a bottom of the refrigerating compartment to a return air opening portion of the cooling chamber and intersecting the exhaust air passage;

The discharge damper is disposed at an intersection of the refrigerating return air passage and the discharge air passage, so that when the discharge damper is in the first state, the refrigerating return air passage is turned on, and the discharge air passage is blocked And when the discharge damper is in the second state, the refrigerating return air passage is blocked, and the discharge air passage is turned on.

Optionally, a top temperature sensor is provided at the top of the evaporator to detect the temperature of the top of the evaporator.

Optionally, the defrosting heater is disposed at a bottom of the evaporator and opposite to a groove located at a bottom of the cooling chamber to pass defrosting water generated during defrosting through the groove The drain pipe flows into a water receiving box located at the bottom of the tank.

According to a second aspect of the present invention, the present invention further provides a defrosting control method for a refrigerating and freezing device, comprising:

Step A: receiving a defrosting signal for indicating defrosting of an evaporator of the refrigerating and freezing device;

Step B: starting a defrosting heater located on the evaporator;

Step C: closing the supply damper located in the supply air passage of the refrigerating and freezing device to block the supply air passage;

Step D: opening a discharge damper located in the discharge air passage of the refrigerating and freezing device to turn on the discharge air passage, so that the hot air generated when the defrost heater heats the defrost is directly discharged through the exhaust air passage To the environmental space.

Optionally, after the step A, the method further includes:

Step E: starting an exhaust pump located in the exhaust air passage to drive hot air in the cooling chamber to be discharged to the environmental space via the exhaust air passage.

Optionally, after the step E, the method further includes:

Step F: stopping the defrosting heater after the temperature of the top of the evaporator reaches a first predetermined temperature.

Optionally, after the step F, the method further includes:

Step G: When the defrosting heater is stopped for a predetermined time, the exhaust pump and the discharge damper are closed.

In the refrigerating and freezing apparatus of the present invention, since the supply damper is provided in the supply air passage connecting the cooling chamber and the storage compartment, the discharge damper is provided in the discharge air passage connecting the cooling chamber and the environmental space, and the evaporator in the cooling chamber is provided When the defrosting is performed, the supply air passage can be blocked by the supply damper, and the hot air generated when the defrosting heater is heated and defrosted can be prevented from flowing into the storage compartment through the supply air passage; and the discharge air passage can be opened by the discharge damper to remove The hot air generated during the frost is directly discharged to the environmental space through the discharge air passage. Therefore, the refrigerating and freezing apparatus of the present invention can prevent the temperature in the storage compartment from rising due to the defrosting hot air, prolonging the storage time of the food, and the evaporator defrosting operation has less influence on the temperature in the storage compartment, and the evaporator After the defrosting is completed, when the storage compartment is cooled again, the temperature in the storage compartment can be restored to the temperature before the defrosting in a short time, thereby reducing the energy consumption of the refrigerating and freezing apparatus.

Further, in the refrigerating and freezing apparatus of the present invention, the exhaust air passage is further provided with an exhaust pump for causing the air in the cooling chamber to flow toward the environmental space, so that the hot air generated during the defrosting can be discharged in time to improve the fluidity of the air. Thereby, the defrosting time of the refrigerating and freezing device is shortened, and the defrosting effect is improved.

Further, in the refrigerating and freezing apparatus of the present invention, the top of the evaporator is provided with the first temperature The sensor detects the temperature at the top of the evaporator in real time to determine its defrosting condition. When the top of the evaporator reaches a predetermined temperature, the defrosting heater can be turned off, thereby automatically stopping the defrosting operation of the evaporator.

The above as well as other objects, advantages and features of the present invention will become apparent to those skilled in the <

DRAWINGS

Some specific embodiments of the present invention are described in detail below by way of example, and not limitation. The same reference numbers in the drawings identify the same or similar parts. Those skilled in the art should understand that the drawings are not necessarily drawn to scale. In the figure:

1 is a schematic structural view of a refrigerating and freezing apparatus according to an embodiment of the present invention;

2 is a schematic structural view of a refrigerating and freezing apparatus in a refrigerating state according to an embodiment of the present invention;

3 is a schematic structural view of a refrigerating and freezing apparatus in a defrosting state according to an embodiment of the present invention;

4 is a schematic structural view of a refrigerating and freezing apparatus according to another embodiment of the present invention;

Figure 5 is a schematic structural view of a refrigerating and freezing apparatus according to still another embodiment of the present invention;

6 is a flow chart of a defrosting control method of a refrigerating and freezing apparatus according to an embodiment of the present invention;

7 is a flow chart of a defrosting control method of a refrigerating and freezing apparatus according to another embodiment of the present invention.

detailed description

1 is a schematic structural view of a refrigerating and freezing apparatus according to an embodiment of the present invention. As shown in FIG. 1, the refrigerating and freezing apparatus 1 includes a case 100 and a door body 200 pivotally coupled to the case 100. The interior of the cabinet 100 defines at least one storage compartment for storing articles, a supply air path, a return air path, and a cooling chamber 40. The supply air path is configured to supply a cooling air flow to the at least one storage compartment. The return air path is configured to flow airflow from the at least one storage compartment. The cooling chamber 40 communicates with the supply air passage and the return air passage, and is provided therein with an evaporator 41 for cooling the air flowing in from the return air passage, and an air for driving the air in the cooling chamber 40 to flow toward the supply air passage. The fan 42 and the defrosting heater 43 disposed on the evaporator. In particular, the tank 100 also defines a discharge air passage 50 that communicates the cooling chamber 40 and the environmental space for direct discharge of air within the cooling chamber 40 to the environmental space. A supply damper and a discharge damper 51 are respectively disposed in the supply air passage and the discharge air passage 50, The supply air path and the discharge air path 50 are selectively turned on and/or blocked.

In the refrigerating and freezing apparatus 1 of the present invention, a supply damper is provided in a supply air passage that connects the cooling chamber 40 and the storage compartment, and a discharge damper 51 is provided in the discharge air passage 50 that communicates the cooling chamber 40 and the environmental space. Therefore, when the evaporator 41 in the cooling chamber 40 is defrosted, the supply air passage can be blocked by the supply damper, and the hot air generated when the defrosting heater 43 is heated and defrosted can be prevented from flowing into the storage compartment through the supply air passage. Further, the discharge air passage 50 can be opened by the discharge damper 51, and the hot air generated at the time of defrosting can be directly discharged to the environmental space through the discharge air passage 50. Therefore, the refrigerating and freezing apparatus 1 of the present invention can prevent the temperature in the storage compartment from rising due to the defrosting hot air, prolonging the storage time of the food, and the defrosting operation of the evaporator 41 has less influence on the temperature in the storage compartment. When the storage chamber is re-cooled after the defrosting of the evaporator 41 is completed, the temperature in the storage compartment can be restored to the temperature before the defrosting in a short time, thereby reducing the energy consumption of the refrigerating and freezing apparatus 1.

In some embodiments of the invention, one end of the exhaust air passage 50 that communicates with the freezer compartment 40 is located downstream of the blower 42 in the direction of air flow. Thus, when the evaporator 41 needs defrosting, the fan 42 can be operated at a lower power to drive the hot air generated during the defrosting to be discharged to the environmental space through the exhaust air passage 50 located downstream of the fan 42 without additional The driving member simplifies the structure of the refrigerating and freezing device 1.

In some embodiments of the invention, at least one of the storage compartments includes a refrigerating compartment 11 and a freezing compartment 12 disposed above and below, the cooling compartment 40 being located behind the freezing compartment 12 and passing through the rear cover of the freezing compartment 12 121 is spaced apart from the freezing compartment 12. The supply air passage includes a refrigerating inlet duct 211 located behind the refrigerating compartment 11 and a refrigerating air inlet 212 opened in the rear compartment 121 of the freezing compartment 12. The supply damper includes a refrigerating inlet damper 221 disposed in the refrigerating inlet duct 211 and a refrigerating inlet damper 222 disposed at the refrigerating inlet vent 212. That is, in the embodiment of the present invention, the cooling chamber 40 communicates with the refrigerating compartment 11 and the freezing compartment 12 through the refrigerating inlet duct 211 and the refrigerating air inlet 212, respectively.

Further, the cooling chamber 40 has an air supply opening that communicates with the supply air passage to supply a cooling airflow to the at least one storage compartment through the air supply opening. Specifically, the air supply opening portion may include a refrigerating air supply opening that communicates with the air inlet end of the refrigerating air inlet 211 and a refrigerating air supply opening that communicates with the refrigerating air inlet 212. The refrigerating air supply opening and the refrigerating air supply opening are located downstream of the evaporator 41 in the flow direction of the air for the air cooled by the evaporator 41 to pass therethrough. Further, the refrigerating inlet damper 221 may be disposed at the air inlet end of the refrigerating inlet duct 211. It should be understood by those skilled in the art that in other embodiments of the present invention, the refrigerated inlet damper 221 may be disposed at any position of the refrigerating inlet duct 211 or at the air inlet of the refrigerating compartment 11.

In some embodiments of the invention, the return air path may include a refrigerated return air passage 31 and a refrigerated return air passage 32. The return air opening portion of the cooling chamber 40 may include a refrigerating return air opening that communicates with the refrigerating return air passage 31 and a refrigerating return air opening that communicates with the refrigerating return air passage 32. The return air opening portion is located upstream of the evaporator 41 in the air flow direction, that is, the refrigerating return air opening and the freezing return air opening are both located upstream of the evaporator 41 to guide the air from the refrigerating compartment 11 and the freezing compartment 12 To the evaporator 41 for cooling. The refrigerating return duct 31 extends from the bottom of the refrigerating compartment 11 to the recirculation opening of the cooling compartment 40.

Further, the refrigerating return duct 31 is located behind the cooling chamber 40 and intersects the exhaust duct 50 that communicates with the cooling chamber 40 and the environmental space. The discharge damper 51 is disposed at an intersection of the refrigerating return air passage 31 and the discharge air passage 50 such that when the discharge damper 51 is in the first state (closed state), the refrigerating return air passage 31 is turned on, and the discharge air passage 50 is blocked. And when the discharge damper 51 is in the second state (open state), the refrigerating return air passage 31 is blocked, and the discharge air passage 50 is opened. Thereby, the conduction and/or blocking of the refrigerating return air passage 31 and the discharge air passage 50 can be simultaneously controlled by the discharge damper 51, thereby reducing the number of dampers and simplifying the structure of the refrigerating and freezing apparatus to some extent.

In some embodiments of the invention, the top of the evaporator 41 is provided with a first temperature sensor 411 to detect the temperature at the top of the evaporator 41. After the top of the evaporator 41 reaches the first predetermined temperature, it can be judged that the defrosting of the evaporator 41 is completed, so that the defrosting heater 43 can be automatically controlled to stop heating the evaporator 41 by the temperature data detected by the first temperature sensor 411. Implement intelligent control.

Further, a second temperature sensor 111 and a third temperature sensor 122 may be respectively disposed on the rear cover of the refrigerating compartment 11 and the freezing compartment 12 to detect the temperatures in the refrigerating compartment 11 and the freezing compartment 12, respectively.

In some embodiments of the present invention, the defrosting heater 43 may be disposed at the bottom of the evaporator 41 and opposed to the groove 44 at the bottom of the cooling chamber 40 to allow defrosting water generated during defrosting to pass through the groove The 44-connected drain pipe 70 flows into the water tank 80 located at the bottom of the tank 100. The water receiving box 80 is disposed above the compressor 90, and when the compressor 90 is in operation, the moisture generated in the water receiving box 80 is evaporated by the heat generated therefrom.

2 is a schematic structural view of a refrigerating and freezing apparatus in a refrigerating state according to an embodiment of the present invention, in which arrows indicate a flow direction of air. When the refrigerating and freezing apparatus 1 is in a cooling state, the compressor 90, the evaporator 41, and the blower 42 are both in an open state. Both the refrigerating inlet damper 221 and the refrigerating inlet damper 222 are opened to open the refrigerating inlet duct 211 and the refrigerating inlet vent 212. The airflow cooled by the evaporator 41 sequentially passes through the air supply opening portion of the cooling chamber 40, the supply damper, and the supply air path. Flow into the storage room. That is, in the embodiment of the present invention, the cooling airflow sequentially flows through the refrigerating air supply opening, the refrigerating air inlet 221, the refrigerating air inlet 211, and the refrigerating compartment air inlet into the refrigerating compartment 11; the cooling airflow sequentially passes through the freezing air supply opening, The chilled intake damper 222 and the chilled air inlet 212 flow into the freezing compartment 12. The air in the storage compartment flows back to the cooling chamber through the return air passage, and is again cooled by the evaporator 41 and flows into the storage compartment, thereby forming a circulation path of the air. That is, in the embodiment of the present invention, the air in the refrigerating compartment 11 is returned to the return air opening portion of the cooling chamber 40 through the refrigerating return air passage 31, is cooled by the evaporator 41, and flows into the refrigerating compartment 11 again. An air circulation path of the refrigerating compartment 11 is formed. The air in the freezing compartment 12 is returned to the return air opening portion of the cooling chamber 40 through the freezing return air passage 32, is cooled by the evaporator 41, and flows into the freezing compartment 12 again, thereby forming an air circulation path of the freezing compartment 12. Also, the discharge damper 51 is closed to block the discharge air passage 50, and the cooling airflow cooled by the evaporator 41 is prevented from flowing to the environmental space.

Further, when the second temperature sensor 111 detects that the temperature in the refrigerating compartment 11 reaches the second predetermined value, the refrigerating and freezing apparatus 1 can control the refrigerating intake damper 221 to be closed. When the third temperature sensor 122 detects that the temperature in the freezing compartment 12 reaches the third predetermined value, the refrigerating and freezing apparatus 1 can control the freezing inlet damper 222 to be closed. Thereby, automatic control of the refrigeration of the storage compartment is realized.

Fig. 3 is a schematic structural view of a refrigerating and freezing apparatus in a defrosting state according to an embodiment of the present invention, in which arrows indicate the flow direction of air. When the refrigerating and freezing device is in the defrosting state, both the compressor 90 and the evaporator 41 are in a stopped state. The defrosting heater 43 is activated to heat the evaporator 41. The discharge damper 51 is in an open state to discharge the hot air generated at the time of defrosting to the environmental space through the discharge air passage 50. The refrigerating inlet damper 221 and the refrigerating inlet damper 222 are both closed to block the refrigerating inlet duct 211 and the refrigerating inlet vent 212, preventing the hot air generated by the defrosting from entering the refrigerating compartment 11 and the freezing compartment 12 to prevent temperature fluctuations thereof. Affect the storage of food. The air in the environmental space may sequentially enter the cooling chamber 40 through the water receiving box 80, the drain pipe 70, and the recess 44 to form an air circulation path when the evaporator 41 is defrosted. Further, when the evaporator 41 is defrosted, the fan 42 may be in a stopped state, and the hot air generated by the defrosting is discharged to the environmental space through the exhaust air passage 50 by means of natural heat dissipation. Preferably, the fan 42 may also be in a state of operating at a lower power to force the hot gas generated by the defrosting to be discharged to the environmental space through the exhaust air passage 50 by a forced manner.

4 is a schematic structural view of a refrigerating and freezing apparatus according to another embodiment of the present invention. In another embodiment of the present invention, an exhaust pump 52 for causing air within the cooling chamber 40 to flow toward the environmental space is also disposed within the exhaust air passage 50. One end of the discharge air passage 50 communicating with the cooling chamber 40 may be located upstream or downstream of the blower 42 in the air flow direction. When it is necessary to defrost the evaporator, The exhaust pump 52 may be turned on to drive the hot air generated by the defrosting to be discharged to the environmental space through the exhaust air passage 50. At this time, the fan 42 can be in a stopped state. Other structural features of the refrigerating and freezing apparatus according to another embodiment of the present invention are the same as those of the embodiment shown in FIG. 1, and are not described herein again.

Fig. 5 is a schematic structural view of a refrigerating and freezing apparatus according to still another embodiment of the present invention. In still another embodiment of the present invention, at least one storage compartment includes a freezing compartment 12, and the cooling compartment 40 is located behind the freezing compartment 12; the supply airway includes a freezing inlet that is opened on the rear cover 121 of the freezing compartment 12. The tuyere 212; the return air path includes a refrigerating return duct 32 at the bottom of the freezing compartment 12. The supply damper includes a chilled intake damper 222 disposed at the chilled air inlet 212. Other structural features of the refrigerating and freezing apparatus 1 according to still another embodiment of the present invention are the same as those in the embodiment shown in FIG. 1, and are not described herein again.

6 is a flow chart of a defrosting control method of a refrigerating and freezing apparatus according to an embodiment of the present invention. In the embodiment of the present invention, the defrosting control method includes:

Step A: receiving a defrosting signal for indicating defrosting of the evaporator 41 of the refrigerating and freezing apparatus 1;

Step B: starting the defrosting heater 43 located on the evaporator 41;

Step C: closing the supply damper located in the supply air passage of the refrigerating and freezing device 1 to block the supply air passage;

Step D: opening the discharge damper 51 located in the discharge air passage 50 of the refrigerating and freezing device 1 to turn on the discharge air passage 50, so that the hot air generated when the defrost heater 43 heats the defrosting is directly discharged to the environment through the discharge air passage 50. space.

It should be understood by those skilled in the art that in the embodiment of the present invention, steps C and D have no sequence, that is, after the defrosting heater 43 is activated, the supply damper may be closed first, and then the discharge damper 51 may be opened; The damper 51, after which the supply damper is closed.

7 is a flow chart of a defrosting control method of a refrigerating and freezing apparatus according to another embodiment of the present invention. In other embodiments of the present invention, after step A, the method may further include:

Step E: The exhaust pump 52 located in the exhaust air passage 50 is activated to drive the hot air in the cooling chamber 40 to be discharged to the environmental space via the exhaust air passage 50. At this time, the blower 42 can be in a stopped state, and the air flow is driven only by the exhaust pump 52. Those skilled in the art will appreciate that there is no order between step E and steps C, D. That is to say, the order of steps C, D and E is not limited, and may be arranged in any order or simultaneously.

Further, after step E, the method may further include:

Step F: When the temperature at the top of the evaporator 41 reaches the first predetermined temperature, the defrosting heater 43 is stopped. In this step, the temperature of the top of the evaporator 41 can be detected by the first temperature sensor 411 provided at the top of the evaporator 41. The first predetermined temperature may be a temperature indicating the end of the defrosting of the evaporator 41.

Further, after step F, the method may further include:

Step G: When the defrosting heater 43 is stopped for a predetermined time, the exhaust pump 52 and the exhaust damper 51 are closed. That is, when the defrosting heater is stopped for a predetermined time, the hot air generated when the defrosting heater 41 is defrosted is substantially completely discharged to the environmental space, and at this time, the exhaust pump 52 and the damper 51 are closed to avoid the air in the refrigerating device. Excessive heat exchange with the air in the environmental space affects the refrigeration performance of the refrigeration system.

It should be understood by those skilled in the art that the refrigerating and freezing apparatus 1 according to the present invention may be a device having a refrigerating or freezing function such as a refrigerator, a freezer, a wine cabinet, a refrigerating tank, or the like, or another device having a refrigerating or freezing compartment.

In this regard, it will be appreciated by those skilled in the <RTIgt;the</RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; The content directly determines or derives many other variations or modifications consistent with the principles of the invention. Therefore, the scope of the invention should be understood and construed as covering all such other modifications or modifications.

Claims

A refrigerating and freezing device includes a case body and a door body pivotally connected to the case body, wherein the case body defines an interior:

At least one storage room for storing items;

a supply air passage configured to supply a cooling airflow to the at least one storage compartment;

Returning to the air passage, configured to flow airflow from the at least one storage compartment;

a cooling chamber that communicates with the supply air passage and the return air passage, and is internally provided with an evaporator for cooling air flowing in from the return air passage, and an air direction for driving the cooling chamber a fan that supplies a flow path and a defrosting heater disposed on the evaporator;

Discharging an air passage connecting the cooling chamber and the environmental space for direct discharge of air in the cooling chamber to the environmental space;

A supply damper and a discharge damper are respectively disposed in the supply air passage and the discharge air passage to selectively conduct and/or block the supply air passage and the discharge air passage.
A refrigerating and freezing apparatus according to claim 1, wherein

An exhaust pump for causing air in the cooling chamber to flow toward the environmental space is further provided in the discharge air passage.
A refrigerating and freezing apparatus according to claim 1, wherein

One end of the discharge air passage communicating with the cooling chamber is located downstream of the fan in the air flow direction.
A refrigerating and freezing apparatus according to claim 1, wherein

The at least one storage compartment includes a refrigerating compartment and a freezing compartment disposed above and below, the cooling compartment being located behind the freezing compartment, and passing through a rear cover of the freezing compartment and the freezing compartment Separated.
A refrigerating and freezing apparatus according to claim 4, wherein

The supply air passage includes a refrigerating inlet duct located behind the refrigerating compartment and a refrigerating air inlet opening on the rear cover of the freezing compartment;

The supply damper includes a refrigerated intake damper disposed in the refrigerating inlet duct and a refrigerated inlet damper disposed at the refrigerating inlet.
A refrigerating and freezing apparatus according to claim 4, wherein

The return air passage includes a refrigerating return air passage extending from a bottom of the refrigerating compartment to a return air opening portion of the cooling chamber and intersecting the exhaust air passage;

The discharge damper is disposed at an intersection of the refrigerating return air passage and the discharge air passage, so that when the discharge damper is in the first state, the refrigerating return air passage is turned on, and the discharge air passage is blocked And when the discharge damper is in the second state, the refrigerating return air passage is blocked, and the discharge air passage is turned on.
A refrigerating and freezing apparatus according to claim 1, wherein

A top temperature sensor is provided at the top of the evaporator to detect the temperature of the top of the evaporator.
A refrigerating and freezing apparatus according to claim 1, wherein

The defrosting heater is disposed at a bottom of the evaporator and opposite to a groove located at a bottom of the cooling chamber such that defrosted water generated during defrosting is located through a drain pipe communicating with the groove In the water receiving box at the bottom of the box.
A defrosting control method for a refrigerating and freezing apparatus according to any one of claims 1-8, comprising:

Step A: receiving a defrosting signal for indicating defrosting of an evaporator of the refrigerating and freezing device;

Step B: starting a defrosting heater located on the evaporator;

Step C: closing the supply damper located in the supply air passage of the refrigerating and freezing device to block the supply air passage;

Step D: opening a discharge damper located in the discharge air passage of the refrigerating and freezing device to turn on the discharge air passage, so that the hot air generated when the defrost heater heats the defrost is directly discharged through the exhaust air passage To the environmental space.
The control method according to claim 9, further comprising: after the step A:

Step E: starting an exhaust pump located in the exhaust air passage to drive hot air in the cooling chamber to be discharged to the environmental space via the exhaust air passage.
The control method according to claim 10, further comprising: after the step E:

Step F: stopping the defrosting heater after the temperature of the top of the evaporator reaches a first predetermined temperature.
The control method according to claim 11, further comprising: after the step F:

Step G: When the defrosting heater is stopped for a predetermined time, the exhaust pump and the discharge damper are closed.