WO2019001552A1

WO2019001552A1 - Refrigeration and freezing apparatus

Info

Publication number: WO2019001552A1
Application number: PCT/CN2018/093534
Authority: WO
Inventors: 曹东强; 陈君; 刘建如; 朱小兵; 曾凡君
Original assignee: 青岛海尔特种电冰箱有限公司; 青岛海尔股份有限公司
Priority date: 2017-06-30
Filing date: 2018-06-29
Publication date: 2019-01-03
Also published as: CN107421205B; CN107421205A

Abstract

Provided is a refrigeration and freezing apparatus (1), comprising: a case body (10), having internally defined a refrigerated compartment (11) and a variable-temperature compartment (12), and an air duct (13) located behind the refrigerated compartment (11) and variable-temperature compartment (12); an evaporator (20), placed vertically in the air duct (13) so as to be used for heat exchange with the air flowing therethrough and thus generating a cooling air flow; a refrigeration fan (30), arranged in the air duct (13) so as to be controlled to activate when it is necessary for the refrigerated compartment (11) to cool, thus driving the cooling air flow to flow toward the refrigerated compartment (11); a variable-temperature fan (40), arranged in the air duct (13) so as to be controlled to activate when it is necessary for the variable-temperature compartment (12) to cool, thus driving the cooling air flow to flow toward the variable-temperature compartment (12); an air-blocking apparatus (50), arranged in the air duct (13) and configured to stop the cooling air flow from entering the variable-temperature compartment (12) when the variable-temperature fan (40) is in a stopped state, and to cause the cooling air flow to enter the variable-temperature fan from bottom to top when the variable-temperature fan is in an operating state, and thus to enter the variable-temperature compartment. The invention reduces the effect on the temperature by the variable-temperature compartment (12) on the refrigerated compartment (11), and the air heat-exchange path of the variable-temperature compartment (12) is longer, such that the range of temperature variation is wider.

Description

Refrigerated freezer

The present application claims the priority of the Japanese Patent Application Serial No. JP-A-----------

Technical field

The present invention relates to refrigeration, refrigeration storage technology, and more particularly to a refrigeration and refrigeration device.

Background technique

In a common direct-cooling refrigerator, the evaporator of the refrigerator compartment is generally attached to the back of the liner, and the evaporator is hidden in the foam layer after foaming. When the refrigeration system is working, the temperature of the cold produced by the evaporator is lowered, and heat is exchanged between the inner tank and the compartment. In such a direct-cooling refrigerator, there is generally no greenhouse change in the interior of the refrigerating compartment, because the conventional air duct structure is difficult to achieve the local temperature-changing requirement, and even if there is a greenhouse, the cooling airflow sent therein is basically the same as the refrigerating compartment. The temperature of the cooling air stream fed in is almost the same. Therefore, the temperature in the changing greenhouse is also greatly affected by the temperature of the refrigerating chamber, and the temperature therein is generally not adjustable.

Summary of the invention

It is an object of the present invention to overcome at least one of the deficiencies of the prior art, to provide a refrigerating and freezing apparatus capable of providing a variable greenhouse in its storage space and having a variable temperature range in the variable greenhouse.

Another object of the invention is to avoid the effects of the refrigerating compartment on the greenhouse.

Still another object of the present invention is to reduce the flow resistance of the airflow and increase the flow velocity of the airflow, thereby improving the cooling efficiency and the cooling effect.

In order to achieve the above object, the present invention provides a refrigerating and freezing apparatus, comprising:

a cabinet defining therein a refrigerating compartment for storing articles and a greenhouse, and a duct located behind the refrigerating compartment and the variable greenhouse;

An evaporator disposed vertically in the air passage for heat exchange with air flowing therethrough to generate a cooling airflow;

a refrigerating fan disposed in the air duct to be controlled to be activated when the refrigerating compartment needs to be cooled, thereby driving a cooling airflow to the refrigerating compartment;

a variable temperature fan disposed in the air duct to be controlled to be activated when the variable greenhouse needs to be cooled, thereby driving a cooling airflow to the greenhouse;

a wind deflecting device disposed in the air duct and configured to prevent a cooling airflow from entering the greenhouse when the variable temperature fan is in a stop state, and causing a cooling airflow to enter from the bottom up when the variable temperature fan is in an operating state The variable temperature fan further enters the variable greenhouse.

Optionally, the air duct is separated from the cold storage chamber and the greenhouse by a duct cover; and

The variable temperature fan is staggered from the refrigerating fan in a height direction of the casing, and the wind shielding device is located between the refrigerating fan and the variable temperature fan in a width direction of the casing, in the The depth direction of the casing is located between the duct cover and the evaporator.

Optionally, a front side surface of the wind shield that is on the front side in the depth direction of the box abuts against the air duct cover, and is behind the rear side of the box body in the depth direction. Abutting the surface to the evaporator.

Optionally, a top end of the wind shield extending upward in a height direction of the box is spaced apart from a top wall of the box by a predetermined distance, so that the variable temperature fan and the refrigerating fan are located at the The space above the windshield is connected.

Optionally, the refrigerating chamber and the variable greenhouse are arranged in the up and down direction; and

The air duct includes a air supply duct located behind the refrigerator compartment and a machine room located behind the variable greenhouse, and the refrigerating fan and the variable temperature fan are both located in the machine room.

Optionally, the evaporator extends vertically downward from a top of the air supply duct to a bottom of the machine room;

The height of the wind shield extending in the height direction of the casing is lower than the height of the evaporator in the direction.

Optionally, the refrigerating compartment is separated from the air supply duct by a refrigerating air duct cover, and the refrigerating air duct cover is provided with a refrigerating air supply opening.

Optionally, the variable greenhouse is separated from the mechanical chamber by a variable temperature air duct cover, and the variable temperature air duct cover is provided with a variable temperature air supply opening.

Optionally, a lower air outlet is connected to the mechanical chamber below the variable greenhouse.

Optionally, the case includes a case for forming an outer portion thereof, a liner for forming an inner portion thereof, and a foam layer formed between the case and the inner liner;

A gap is left between the evaporator and the rear wall of the inner tank to prevent cold from being transmitted to the outside of the tank through the rear wall of the inner casing.

The refrigerating and freezing apparatus of the present invention is provided with two wind turbines respectively controlled to drive air to the refrigerating compartment and the variable greenhouse, respectively, and a wind shield is further provided in the duct. When the greenhouse needs to be cooled, the variable temperature fan starts. Due to the presence of the windshield device, whether the refrigerating chamber needs refrigeration or not, the airflow that flows through the variable temperature fan and flows into the variable greenhouse is the cooling airflow flowing through the heat exchange area of the longer evaporator surface. The cooling airflow is sufficiently cooled and the temperature is low, thereby ensuring that the variable greenhouse has a wide range of variable temperatures.

Further, in the case where only the refrigerating compartment is cooled, the refrigerating fan is activated, and the air is exchanged by the surface of the evaporator to form a cooling airflow and then enters the refrigerating compartment. Since the variable temperature fan is not activated, most of the air is blocked outside the greenhouse without entering the greenhouse due to the blocking action of the wind shield, thereby avoiding the impact on the greenhouse.

Further, the present invention shifts the variable temperature fan and the refrigerating fan so that the variable temperature fan is located obliquely above the refrigerating fan. Compared with the case where the variable temperature fan is disposed directly above the refrigerating fan, the present invention can increase the position above the refrigerating fan and in the lateral direction. The thickness of the portion of the space juxtaposed with the variable temperature fan in the front-rear direction increases the cross-sectional area of the airflow in a portion above the refrigerating fan, reduces the airflow resistance, and increases the airflow velocity, thereby improving the Cooling efficiency and cooling effect.

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 will be described in detail, 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 front view of a refrigerating and freezing apparatus according to an embodiment of the present invention;

Figure 2 is a schematic cross-sectional view taken along line A-A of Figure 1;

Figure 3 is a schematic side view of a refrigerating and freezing apparatus according to an embodiment of the present invention;

4 is a schematic air circulation diagram of a refrigerating and freezing apparatus in a refrigerating compartment only when it is cooled according to an embodiment of the present invention;

Figure 5 is a schematic air circulation diagram of a refrigerating and freezing apparatus in a greenhouse only when it is cooled according to an embodiment of the present invention;

Fig. 6 is a schematic air circulation diagram of a refrigerating and freezing apparatus for simultaneous cooling in a refrigerating compartment and a variable greenhouse according to an embodiment of the present invention.

Detailed ways

The embodiment of the invention provides a refrigerating and freezing device, which can be a direct cooling refrigerator, a wind direct cooling refrigerator or other devices that use a combination of direct cooling or direct cooling and air cooling. 1 is a schematic front view of a refrigerating and freezing apparatus according to an embodiment of the present invention, FIG. 2 is a schematic cross-sectional view taken along line AA of FIG. 1, and FIG. 3 is a refrigerating and freezing apparatus according to an embodiment of the present invention. Schematic side view. Referring to FIGS. 1 to 3, the refrigerating and freezing apparatus 1 provided by the present invention includes a casing 10, an evaporator 20, a refrigerating fan 30, a variable temperature fan 40, and a wind blocking device 50. The refrigerator 10 defines a refrigerating compartment 11 for storing articles and a greenhouse 12, and an air duct 13 located behind the refrigerating compartment 11 and the variable greenhouse 12. Specifically, in some embodiments, the refrigerating chamber 11 and the changing chamber 12 are sequentially arranged in the up and down direction, that is, the refrigerating chamber 11 is located above the changing chamber 12. In some alternative embodiments, the refrigerating compartment 11 may also be located below or to the side of the greenhouse 12.

Further, other storage compartments may be defined in the cabinet 10, such as a vegetable compartment 17 located below the variable greenhouse 12 or a compartment having other functions (e.g., freezing function).

The evaporator 20 is placed vertically in the duct 13 for heat exchange with the air flowing therethrough to generate a cooling air stream. The refrigerating fan 30 is disposed in the duct 13 to be controlled to be activated when the refrigerating chamber 11 needs to be cooled, thereby driving the cooling airflow to the refrigerating chamber 11. The variable temperature fan 40 is disposed in the air duct 13 to be controlled to be activated when the greenhouse 12 is required to cool, thereby driving the cooling airflow to the greenhouse 12. The wind shield device 50 is disposed in the air duct 13 and configured to prevent the cooling airflow from entering the variable greenhouse 12 when the temperature change fan 40 is in a stopped state, and to cause the cooling airflow to enter the temperature change fan 40 from bottom to top when the temperature change fan 40 is in the running state. And then enter the greenhouse.

The refrigerating and freezing apparatus 1 of the present invention is configured to drive air to the refrigerating compartment 11 and the changing greenhouse 12 by providing two fans separately controlled, and a wind shield 50 is further provided in the duct 13. When the variable temperature greenhouse 12 needs to be cooled, the temperature change fan 40 is started. Due to the presence of the wind shield device 50, regardless of whether the refrigerating chamber 11 needs to be cooled, the airflow that is driven by the variable temperature fan 40 and flows into the variable greenhouse flows through the surface of the longer evaporator 20. The cooling airflow of the heat exchange area is sufficiently cooled and the temperature is low, thereby ensuring that the variable greenhouse 12 has a wide variable temperature range.

Further, in the case where only the refrigerating compartment 11 is cooled, the refrigerating fan 30 is activated, and the air is exchanged by the surface of the evaporator 20 to form a cooling airflow, and then enters the refrigerating compartment 11. Since the temperature change fan 40 is not activated, most of the air is blocked outside the greenhouse 12 without entering the greenhouse 12 under the blocking action of the wind shield 50, thereby avoiding the influence on the greenhouse 12.

In some embodiments of the invention, the air duct 13 is separated from the refrigerating compartment 11 and the variable greenhouse 12 by a duct cover 60. The variable temperature fan 40 is shifted from the refrigerating fan 30 in the height direction of the casing 10. Specifically, the variable temperature fan 40 is located obliquely above the refrigerating fan 30, and the present invention can increase the position above the refrigerating fan 30 and laterally with the variable temperature fan as compared with the case where the variable temperature fan 40 is disposed directly above the refrigerating fan 30. The thickness of the portion of the space in the front-rear direction (ie, the depth direction of the casing 10), that is, the cross-sectional area of the airflow flowing in a portion above the refrigerating fan 30, reduces the airflow resistance and increases the airflow velocity. , thereby improving the cooling efficiency and cooling effect.

Further, the wind shield 50 is located between the refrigerating fan 30 and the variable temperature fan 40 in the width direction of the casing 10, and between the cover 13 of the duct 13 and the evaporator 20 in the depth direction of the casing 10.

Further, the front side surface of the wind shield device 50 on the front side in the depth direction of the casing 10 abuts against the air passage 13 cover plate, and the rearward surface on the rear side in the depth direction of the casing 10 abuts In the evaporator 20.

That is to say, the wind shield 50 can separate the refrigerating fan 30 and the variable temperature fan 40 in the lateral direction, thereby avoiding interference of the airflow in the adjacent areas. For example, when the refrigerating fan 30 is operated and the variable temperature fan 40 is stopped, the airflow driven by the refrigerating fan 30 flows only in the sub-ducts of the air duct 13 on the side of the wind-shielding device 50 facing the refrigerating fan 30, avoiding the refrigerating fan The 30-driven airflow enters the greenhouse 12 to affect it.

In some embodiments of the present invention, the top end of the wind shield 50 extending upward in the height direction of the casing 10 is spaced apart from the top wall of the casing 10 by a predetermined distance to allow the temperature change fan 40 and the refrigerating fan 30 to pass through the wind shield. The space above the device 50 is in communication. That is, a predetermined space is left between the top end of the wind shield 50 and the top wall of the casing 10 to facilitate communication with the sub air duct located on the side of the wind shield 50 facing the refrigerating fan 30 and at the wind shield. The other air passage of 50 is on the side of the variable temperature fan 40.

In some embodiments of the present invention, the air duct 13 includes a blower duct 131 located behind the refrigerating compartment 11 and a machine compartment 132 located behind the variable greenhouse 12, and both the refrigerating fan 30 and the variable temperature fan 40 are located in the machine room 132. That is, the air supply duct 131 is located above the machine room 132 and communicates with the machine room 132. Further, the refrigerating compartment 11 and the air supply duct 131 are separated by a refrigerating duct cover 61, and the refrigerating duct cover 61 is provided with a refrigerating air supply opening 611. The temperature change chamber 12 and the machine room 132 are separated by a temperature change air passage cover 62, and the temperature change air passage cover 62 is provided with a temperature change air supply port 621. That is, the duct cover 60 may include a refrigerating duct cover 61 for separating the refrigerating chamber 11 from the blow duct 131 and a variable temperature duct cover for separating the change chamber 12 from the machine room 132. Board 62.

Further, a return air opening 121 communicating with the mechanical chamber 132 is provided below the variable greenhouse 12 to facilitate return of the refrigerating chamber 11 and/or the return air of the greenhouse 12 to the mechanical chamber 132. Specifically, the return air opening 121 can be opened at the bottom of the variable temperature air duct cover 61.

4 is a schematic air circulation diagram of a refrigerating and freezing apparatus in a refrigerating compartment only in accordance with an embodiment of the present invention. Referring to Fig. 4, when only the refrigerating compartment 11 requires refrigeration, the compressor of the refrigerating and freezing apparatus 1 is operated, the refrigerating fan 30 is started, and the variable temperature fan 40 is stopped. Under the driving action of the refrigerating fan 30, the return air in the refrigerating chamber 11 is returned to the machine room 132 through the return air opening 121, and is along the surface of the evaporator 20 in the sub-duct located on the side of the wind-shielding device 50 facing the refrigerating fan 30. Flow upwards. When the air comes into contact with the surface of the evaporator 20, heat exchange is generated with the evaporator 20, thereby forming a cooling airflow. Under the driving action of the refrigerating fan 30, the cooling airflow enters the refrigerating chamber 11 through the refrigerating air supply port 611 on the refrigerating air duct cover 61, thus forming a refrigerating cycle of the refrigerating chamber 11, thereby achieving the purpose of refrigerating the refrigerating chamber 11.

Figure 5 is a schematic air circulation diagram of a refrigerating and freezing apparatus in a greenhouse only when it is cooled in accordance with one embodiment of the present invention. Referring to Fig. 5, when only the variable greenhouse 12 needs to be cooled, the compressor of the refrigerating and freezing apparatus 1 is operated, the refrigerating fan 30 is stopped, and the variable temperature fan 40 is started. Under the driving action of the heat insulating fan 40, the airflow in the refrigerating chamber 11 flows into the air supply duct 131 through the refrigerating air supply port 611, and along the evaporator 20 in the sub air duct located on the side of the wind deflecting device 50 facing the temperature changing fan 40. The surface flows down. At this time, the refrigerating air supply port 611 is used as a return air port. When the air comes into contact with the surface of the evaporator 20, heat exchange occurs with the evaporator 20, thereby forming a cooling airflow. Under the driving action of the variable temperature fan 40, the cooling airflow enters the variable greenhouse 12 through the variable temperature air supply port 621 on the variable temperature air duct cover 62, thus forming a refrigeration cycle of the variable greenhouse 12, thereby achieving the purpose of changing the greenhouse 12 refrigeration.

It should be emphasized that when only the variable greenhouse 12 needs to be cooled, the airflow flowing into the variable greenhouse 12 is formed by the heat exchange surface flowing through the evaporator 20 from the top thereof to the section of the same height as the variable temperature fan 40. Cooling airflow. Compared with the prior art, the length of the evaporator 20 flowing through the cooling airflow flowing into the greenhouse 12 of the present invention is greatly increased, thereby increasing the heat exchange area, prolonging the heat exchange time, and allowing the airflow to be sufficiently cooled. It is ensured that the variable greenhouse 20 can have a wide variable temperature range to meet the needs of users.

Fig. 6 is a schematic air circulation diagram of a refrigerating and freezing apparatus for simultaneous cooling in a refrigerating compartment and a variable greenhouse according to an embodiment of the present invention. Referring to Fig. 6, when both the refrigerating compartment 11 and the variable greenhouse 12 require refrigeration, the compressor of the refrigerating and freezing apparatus 1 is operated, and both the refrigerating fan 30 and the variable temperature fan 40 are activated. Under the driving action of the refrigerating fan 30, the return air in the refrigerating chamber 11 is returned to the machine room 132 through the return air opening 121, and is along the surface of the evaporator 20 in the sub-duct located on the side of the wind-shielding device 50 facing the refrigerating fan 30. Flow upward until it reaches the space above the windshield 50. When the air comes into contact with the surface of the evaporator 20, heat exchange occurs with the evaporator 20, thereby forming a cooling airflow. The cooling airflow is divided into two parts in a space above the windshield device 50, and a part of the cooling airflow enters the refrigerating chamber 11 through the refrigerating air supply port 611 on the refrigerating air duct cover 61, thus forming a refrigerating cycle of the refrigerating chamber 11 The purpose of cooling the refrigerator compartment 11 is. Under the driving action of the temperature change fan 40, another portion of the cooling airflow flows down the surface of the evaporator 20 in the sub-duct located on the side of the wind deflector 50 toward the variable temperature fan 40, and is again in contact with the surface of the evaporator 20. Again, heat exchange occurs with the evaporator 20 to form a lower temperature cooling gas stream. Under the driving action of the variable temperature fan 40, the portion of the lower temperature cooling airflow enters the variable greenhouse 12 through the variable temperature air supply port 621 on the variable temperature air duct cover 62, thus forming a refrigeration cycle of the variable greenhouse 12, thereby achieving the greenhouse 12 The purpose of refrigeration.

It can be clearly seen that when both the refrigerating compartment 11 and the variable greenhouse 12 require refrigeration, the cooling airflow flowing into the variable greenhouse 12 is heat exchanged with the evaporator 20 a plurality of times, which greatly increases the length of the airflow flowing through the evaporator 20, thereby increasing The heat exchange area is enlarged, the heat exchange time is prolonged, and the airflow can be sufficiently cooled, thereby ensuring that the variable temperature range can be varied within the greenhouse 12 to meet the needs of users.

In some embodiments of the invention, the variable temperature fan 40 is located above the refrigerating fan 30 in the height direction of the tank 10. Specifically, the temperature change fan 40 may be located obliquely above the refrigerating fan 30.

In some embodiments of the invention, the evaporator 20 extends vertically downward from the top of the blower duct 131 to the bottom of the machine chamber 132. That is, the evaporator 20 is almost the same height as the entire air duct 13, whereby the area of the airflow flowing through the evaporator 20 can be increased regardless of whether the refrigerating chamber 11 requires refrigeration or the greenhouse 12 needs to be cooled, thereby improving heat exchange. Efficiency and heat transfer.

Further, the height of the wind shield 50 extending in the height direction of the casing 10 is lower than the height of the evaporator 20 in this direction. Further, the wind shield 50 may include a straight section extending vertically downward and a curved section connected to the straight section and half-circle around the variable temperature fan 40 to better convert the variable temperature fan 40 and the refrigerating fan 30 apart.

In some embodiments of the invention, the casing 10 includes a casing 14 for forming an exterior thereof, a liner 15 for forming an interior thereof, and a foamed layer 16 formed between the casing 14 and the liner 15. A gap is left between the evaporator 20 and the rear wall of the inner liner 15 to prevent the cooling amount from being transmitted to the outside of the casing 10 through the rear wall of the inner casing 15.

Those skilled in the art should understand that "upper", "lower", "inner", "outer", "horizontal", "front", "rear" and the like in the embodiments of the present invention are used to indicate azimuth or positional relationship. The terminology is based on the actual use state of the refrigerating and freezing apparatus 1, and these terms are only for convenience of description and understanding of the technical solutions of the present invention, and do not indicate or imply that the device or component referred to has a specific orientation. Therefore, it should not be construed as limiting the invention.

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, comprising:

a cabinet defining therein a refrigerating compartment for storing articles and a greenhouse, and a duct located behind the refrigerating compartment and the variable greenhouse;

An evaporator disposed vertically in the air passage for heat exchange with air flowing therethrough to generate a cooling airflow;

a refrigerating fan disposed in the air duct to be controlled to be activated when the refrigerating compartment needs to be cooled, thereby driving a cooling airflow to the refrigerating compartment;

a variable temperature fan disposed in the air duct to be controlled to be activated when the variable greenhouse needs to be cooled, thereby driving a cooling airflow to the greenhouse;

a wind deflecting device disposed in the air duct and configured to prevent a cooling airflow from entering the greenhouse when the variable temperature fan is in a stop state, and causing a cooling airflow to enter from the bottom up when the variable temperature fan is in an operating state The variable temperature fan further enters the variable greenhouse.
The refrigerating and freezing apparatus according to claim 1, wherein

The air duct is separated from the refrigerating chamber and the greenhouse by a duct cover; and

The variable temperature fan is staggered from the refrigerating fan in a height direction of the casing, and the wind shielding device is located between the refrigerating fan and the variable temperature fan in a width direction of the casing, in the The depth direction of the casing is located between the duct cover and the evaporator.
The refrigerating and freezing apparatus according to claim 2, wherein

a front side surface of the wind shield that is on the front side in the depth direction of the casing abuts against the air duct cover, and a rearward surface that is on the rear side in the depth direction of the casing abuts In the evaporator.
The refrigerating and freezing apparatus according to claim 3, wherein

The top end of the wind shield extending upward in the height direction of the box is spaced apart from the top wall of the box by a predetermined distance, so that the variable temperature fan and the refrigerating fan pass above the windshield The space is connected.
The refrigerating and freezing apparatus according to claim 4, wherein

The refrigerating chamber and the variable greenhouse are arranged in the up and down direction in sequence;

The air duct includes a air supply duct located behind the refrigerator compartment and a machine room located behind the variable greenhouse, and the refrigerating fan and the variable temperature fan are both located in the machine room.
A refrigerating and freezing apparatus according to claim 5, wherein

The evaporator extends vertically downward from a top of the blower duct to a bottom of the machine room;

The height of the wind shield extending in the height direction of the casing is lower than the height of the evaporator in the direction.
A refrigerating and freezing apparatus according to claim 5, wherein

The refrigerating compartment is separated from the air supply duct by a refrigerating air duct cover, and the refrigerating air duct cover is provided with a refrigerating air supply opening.
A refrigerating and freezing apparatus according to claim 5, wherein

The variable temperature greenhouse is separated from the mechanical chamber by a variable temperature air duct cover, and the variable temperature air duct cover is provided with a variable temperature air supply opening.
A refrigerating and freezing apparatus according to claim 5, wherein

A return air inlet communicating with the mechanical chamber is disposed below the variable greenhouse.
The refrigerating and freezing apparatus according to claim 1, wherein

The case includes a case for forming an outer portion thereof, a liner for forming an inner portion thereof, and a foam layer formed between the case and the inner liner;

A gap is left between the evaporator and the rear wall of the inner tank to prevent cold from being transmitted to the outside of the tank through the rear wall of the inner casing.