KR19980073347A - Refrigerator with air curtain generator - Google Patents

Abstract

A refrigerator having an air curtain generator in a refrigerating compartment is disclosed.

The cold air supply duct for the air curtain is installed at the top end of the refrigerating compartment.

A cross flow fan is provided in the cold air supply duct, and a cold air supply port for the air curtain is formed at an end of the cold air supply duct adjacent to the door of the refrigerating compartment.

The cold air supply port has a slit shape and extends along the width direction of the refrigerating chamber. At least one step is formed on the inner lower surface of the cold air supply duct. The cold air supply duct is in communication with the cold air recovery duct constituting the cooling system of the refrigerator.

When opening the door of the refrigerating compartment, an air curtain is formed over the open side to prevent intrusion of outside air.

Description

Refrigerator with air curtain generator

The present invention relates to a refrigerator, and more particularly, to a refrigerator that blocks the outflow of cold air in the refrigerating compartment when opening a refrigerating compartment door using an air curtain.

In general, as shown in FIG. 5, the refrigerator is divided into a freezer compartment 100 and a refrigerating compartment 200.

In addition, a compressor 10 for compressing a refrigerant is installed at the bottom of the refrigerator, and the evaporator 20 is installed at the rear side of the freezing chamber 100.

In addition, the refrigerant compressed by the compressor 10 is circulated, and the evaporator 20 cools the surrounding air by the action of the circulating refrigerant, and the cold air cooled by the evaporator 20 passes through the freezer compartment through a cold air supply passage. 100 and the refrigerating chamber 200.

In addition, a cold air recovery duct 30 is formed between the freezer compartment 100 and the refrigerating compartment 200, and the cold air recovery duct 30 is connected to the freezer compartment 100, the refrigerating compartment 200, and the evaporator 20.

The cold air recovery duct 30 is extended by the freezing chamber 100 and the refrigerating chamber 200 to suck the warmed air divided by the frosting plate 32 so that the warmed air is supplied to the evaporator 20. The fan 22 is installed at an upper end of the evaporator 20 to supply the cold air cooled through the evaporator 20 to the freezing chamber 100 and the refrigerating chamber 200 through a cold air supply duct.

In addition, the door 40 for the freezer compartment 100 is installed in the front of the freezer compartment 100, the door (not shown) for the refrigerator compartment 200 is also installed in the front of the refrigerator compartment 200.

When the door for the refrigerating compartment is opened, the outside air invades the refrigerating compartment 200 as shown by a blank arrow in the drawing due to a temperature difference in the refrigerating compartment 200.

At this time, the cold air in the refrigerating chamber 200 is moved downwards, that is, toward the shelves 34, 35, 36, and flows out of the refrigerator along the trajectory of the ellipse as shown by solid arrows in the drawing, which is a typical natural convection. The phenomenon occurs continuously until the temperature inside and outside the refrigerating chamber 200 becomes equal in the state in which the door of the refrigerating chamber 200 is opened.

6 is a graph showing the relationship between the door opening time of the refrigerating compartment and the temperature of the refrigerating compartment in the conventional refrigerator, where A represents the temperature of the upper storage space of the refrigerating compartment 200 above the shelf 34, and B is a shelf. (35) The temperature of the suspended storage space of the upper refrigerating compartment 200, C represents the temperature of the lower storage space of the refrigerating compartment 200 above the shelf 36, as shown, the temperature of the refrigerating compartment 200 The temperature rises rapidly according to the opening time of the door. In particular, the temperature of the upper storage space becomes equal to the outside temperature within about 10 seconds after the door is opened.

According to this process, the elevated temperature in the refrigerating compartment 200 is not quickly recovered even when the door is closed, and a longer time is required in view of the temperature uniformity in the refrigerating compartment 200.

As a result, it is natural that the shelf life of the food stored in the refrigerator is shortened.

On the other hand, a lot of research has been carried out to solve this problem, one of them is to apply the air curtain technology used in commercial open show case to the refrigerator to maintain the internal temperature, Campbell (Campbell) A typical open display rack is disclosed in US Pat. No. 5,048,303, et al.

However, the air curtain technology used in such commercial open shelves is difficult to apply to a refrigerator from the following point of view.

First, the open display rack is composed of a discharge port in the upper part where the air curtain is injected and an inlet in the lower part where air for the air curtain is recovered, and the manufacturing cost of the refrigerator increases due to the installation of a separate duct to apply the inlet to the refrigerator. Food storage space is reduced.

Second, the cold air injected from the upper part of the open shelves should function not only to block the air but also to cool the internal storage.In order to increase the air blocking performance, it is required to spray very fast cold air continuously, but to increase the cooling performance. Intermittent control of the injection cold air or variable control of the flow rate of the injection cold air is required.

In other words, these two requirements are mutually contradictory technical contents. In the open shelves, double air curtains or triple air curtains are used to solve the above problems. It is practically impossible.

Third, for the cooling function in the open shelves, the diffusion of the sprayed cold air and the generation of turbulent flow in the shelves should be considered. For this purpose, the inlet coolant inlet of the lower part of the open shelves is provided to protrude further forward than the outlet of the upper part. Fig. Is installed with an inclination of a predetermined angle.

Therefore, it is practically difficult to employ such a structure in a refrigerator, and also inflow of the outside air can be increased by the spraying cold air spreading and mixing with the outside air in the refrigerator.

The refrigerator provided with the air curtain generating apparatus according to the present invention was devised to solve the above-described problems, the technical problem of the present invention is to provide a refrigerator employing an air curtain without a separate injection cooler inlet. It is.

The above technical problem is a cold air circulation consisting of a freezer compartment, a refrigerating compartment, a cold air generating means, a cold air supply duct having at least one cold air supply port, and a cold air recovery duct having at least one cold air recovery port formed on the rear surface of the cold compartment and a fan member. Cold air circulation means comprising a cold air recovery duct and a fan member having means and at least one cold air recovery port formed on a rear surface of the refrigerating chamber;

It is provided adjacent to the door of the refrigerating compartment and provided with a slit-shaped cold air supply port extending along the width direction of the refrigerating compartment for injecting cold air for air curtain toward the lower side of the refrigerating compartment, so as to extend from the back of the refrigerating compartment to the front It is provided on the top surface of the refrigerating compartment in the refrigerating compartment, in communication with the cold air recovery duct, is operated when the air supply duct for air curtain, the door of the refrigerating compartment is opened, stops when the door is closed, the It is achieved by providing a refrigerator having an air curtain generating device, which is provided in the air curtain generating duct for the air curtain, and is made of air curtain generating means composed of a fan member for air curtain generating cold air for the air curtain.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 1 to 3.

1 is a side cross-sectional view showing the internal structure of the refrigerator of the present invention in a state where the refrigerating compartment door is opened;

2 is a front view showing the internal structure of the refrigerator of the present invention in a state where a cross-flow fan and a motor are exposed;

3 is an enlarged cross-sectional view of the air curtain generating device shown in FIG.

Figure 4 is a graph showing the relationship between the door opening time and the amount of energy loss of the refrigerator of the present invention and the conventional refrigerator,

Figure 5 is a side cross-sectional view showing the internal structure of a conventional refrigerator,

6 is a graph showing the relationship between the door opening time and the temperature of the refrigerating chamber in the conventional refrigerator.

<Explanation of symbols for main parts of drawing>

23,24: Cold air circulation fan 25,26: Cold air supply duct

27: cold air supply port 30: cold air recovery duct

40: door 42: cold air supply duct

44: fan for air curtain 47: cold air circulation duct

48,48 ', 48: Cold recovery port 100: Freezer

200: cold storage room

In FIG. 2, the refrigerator includes a freezing compartment 100 and a refrigerating compartment 200.

In addition, the compressor 10 mounted on the bottom of the refrigerator compresses the refrigerant and circulates the refrigerant to the evaporator 20 installed on the rear side of the freezing chamber 100. The evaporator 20 is surrounded by the evaporation of the circulating refrigerant. Cool the air.

In addition, the cold air circulation fans 23 and 24 are installed at the rear side of the freezing chamber 100, and the cold air cooled by the evaporator 20 is supplied to the freezing chamber 100 and the refrigerating chamber through the cold air supply ducts 25 and 26. 200 each).

The cold air supply duct 25 is installed at the rear side of the freezing compartment 100, and the cold air introduced into the cold air supply duct 25 by the fan 23 is supplied to the freezing compartment 100 through the cold air supply port 27. The cold air supply duct 26 is provided on the rear side of the refrigerator, and is preferably branched into two ducts and extends along both corners of the rear side of the refrigerating chamber 200.

In addition, the cold air introduced into the cold air supply duct 26 through the fan 24 is supplied to the refrigerating chamber 200 through the cold air supply port 28, and preferably cold air supply ducts are formed on both sidewalls of the refrigerating chamber 200. 26 may be provided with a separate cold air supply port 29 in communication with.

On the other hand, a heat insulating member 41 for maintaining the temperature difference between the freezer compartment 100 and the refrigerating compartment 200 surrounds the top, bottom, left and right sides of the refrigerator, and is provided between the freezer compartment 100 and the refrigerating compartment 200.

In addition, a cold air supply duct 42 for the air curtain is provided below the heat insulating member 41 provided between the freezing chamber 100 and the refrigerating chamber 200, the fan holding portion 42a for the air curtain, the horizontal portion 42b, A curved portion 42c having a predetermined curvature, and a straight portion 42d inclined with a vertical line and a predetermined angle [theta]. The cold air discharge port 43 for the air curtain has a slit shape and is provided above the refrigerating chamber 200 adjacent to the door of the refrigerating chamber 200.

At this time, the cold air discharge port 43 for the air curtain is preferably formed over the entire width of the refrigerating chamber 200.

Since the cold air supply duct 42 has a straight portion 42d, the jet cooling air is not ejected in the vertical direction, but is ejected toward the door of the refrigerating chamber 200 at a predetermined angle θ from the vertical direction. Preferably, θ is 5 ° to 20 °, more preferably 10 ° to 15 °.

As shown in Fig. 1, the air curtain fan 44 is provided in the air curtain fan holding portion 42a near the rear side of the refrigerator. The cross flow fan must be used as the fan 44 for laminar flow formation.

The crossflow fan 44 preferably has the same length as the inner width of the refrigerating chamber 200, and the crossflow fan 44 is driven by the added motor 46.

The lower surface of the cold air supply duct 42 for the air curtain is inclined at a predetermined angle so that the cross-sectional area of the cold air supply duct 42 becomes smaller toward the cold air discharge port 43. As a result, a laminar flow is formed in which the flow rate of the cold air flowing near the upper surface of the cold air supply duct 42 is faster than the flow rate of the cold air flowing near the lower surface of the cold air supply duct 42. .

The length of the arrow shown in FIG. 3 represents the flow rate of cold air. Alternatively, one or more steps may be formed on the lower surface of the cold air supply duct 42 to enhance this effect, or a member having a large surface roughness may be used on the lower surface of the cold air supply duct 42. 3 shows a cold air supply duct 42 having a bottom surface on which two steps 45 are formed.

The curved portion 42c of the cold air supply duct 42 for the air curtain has a predetermined curvature so as to transfer the laminar flow having different speeds formed in the horizontal portion 42b to the straight portion 42d, and the cold air supply duct 42 The straight portion 42d is provided for the straightness of the air curtain and the end thereof forms the cold air discharge port 43.

The cold air supply duct 42 for the air curtain is in communication with the cold air recovery duct 47 of the refrigerating chamber 200, in other words, the refrigerator of the present invention does not have a separate air curtain recovery port and recovery duct, for cold air circulation The cold air recovery duct 47 and the cold air recovery holes 48, 48 ', 48 are used.

The cold air recovery duct 47 extends vertically along the central portion of the rear side of the refrigerator. The cold air recovery ports 48 are formed in the plurality of storage spaces in the refrigerating chamber 200, respectively. In this embodiment, the upper, middle and lower storage spaces are provided. Preferably, the cross-sectional area of the cold air recovery holes 48 'provided in the upper storage space is smaller than the cold air recovery holes 48' provided in the storage space of the suspension, and the cross-sectional area of the cold air recovery holes 48 'provided in the storage space of the suspension. Is smaller than the cold air recovery port 48 provided in the storage space at the bottom.

The storage space of the refrigerating chamber 200 is divided by the shelves 49, 49 ′, and 49. The upper surfaces of the shelves 49, 49 ', 49 are preferably formed flat to facilitate the recovery of the injected cold air.

The door end of the shelves 49 and 49 'is positioned to retreat to the back of the refrigerator rather than the vertical position of the cold air outlet 43 for the air curtain, and the rear end of the shelves 49 and 49' and 49 is a refrigerating chamber ( Close to the inner back of

The door end of the shelf 49 is positioned to protrude toward the door of the refrigerator rather than the vertical position of the cold air discharge port 43.

The installation height of the cold air recovery ports 48, 48 ', 48 in each storage space is determined in consideration of the storage of the storage, and is preferably installed at the upper half of the shelf.

It is preferable that the shapes of the cold air recovery ports 48, 48 ', 48 are long, for example, rectangular or elliptical.

Referring to the operation of the present invention as described above, when opening the door of the refrigerating chamber 200, the cross flow fan 44 starts to operate, if the fan 24 is operating, when opening the door of the refrigerating chamber 200, the operation Is stopped.

Cold air is injected through the cold air discharge port 43 for the air curtain according to the operation of the cross flow fan 44, and the air curtain is formed. As the air curtain is formed, the cold air of the refrigerating chamber 200 cannot be leaked to the outside. Therefore, the temperature in the refrigerating chamber 200 does not increase rapidly.

Then, the laminar flow generated by the cross flow fan 44 is converted into laminar flow having different interlaminar flow rates through the horizontal portion 42b of the cold air supply duct 42 for the air curtain, and the laminar flow is the curved portion of the cold air supply duct 42. It is injected through the cold air supply port 43 via 42c and the straight part 42d.

Since the straight portion 42d is provided to have a predetermined angle toward the door with respect to the vertical line, the injection cooler is also injected at a predetermined angle, and the cold air supply port 43 is provided to provide a relatively thin air curtain. It has a slit shape.

On the other hand, the injection speed of the air curtain is determined so that a specific point (critical point) in which the air flow is sharply dispersed is located in the storage space at the bottom of the refrigerating chamber, where the injection speed means the speed of the air flow is the fastest among the injection cold air.

In addition, the cross-sectional areas of the horizontal portion 42b, the curved portion 42c, and the straight portion 42d of the cold air supply duct 42 for the air curtain are such that turbulent components such as vortex and eddy are not formed. , It is determined to have a low flow resistance.

In addition, the inner airflow of the relatively slow air curtain is bent in the L-shape at the upper or middle storage space of the refrigerating chamber because the length of the specific point where the airflow is rapidly dissipated is relatively short, and the fastest outermost Airflow is bent L-shaped in the storage space at the bottom of the refrigerator compartment. In this case, the main driving force for bending the air flow is the suction force of the cold air through the cold air recovery ports 48, 48 ', 48 generated by the operation of the fan 44 for the air curtain. The trajectory of the jet chiller is shown by an arrow in FIG. 1. When the internal airflow of a relatively slow air curtain is bent, the external airflow of a relatively fast air curtain is forced into the inside of the refrigerating chamber by the viscosity of the air. Prevent heading to To do this effectively, the speed difference between the inside and outside airflow of the air curtain is determined so that the airflow does not separate after injection.

Preferably, the cross-sectional area of the cold air recovery holes 48 provided in the storage space at the top of the refrigerating compartment is smaller than the cold air recovery holes 48 'provided in the storage space of the suspension, and the cold air recovery holes 48' provided in the storage space of the suspension. The cross-sectional area of is smaller than the cold air recovery holes 48 provided in the storage space at the bottom.

As a result, the injector stream receives a suction force that gradually increases with its progress, so that the injector stream is bent in an L-shape.

On the other hand, when the door of the refrigerating compartment 100 is closed, the air curtain fan 44 stops operation, and when the temperature of the refrigerating compartment rises above an appropriate temperature, the cooling system of the refrigerator operates.

4 is a graph showing a relationship between a refrigerator door opening time and an energy loss amount in a refrigerator equipped with an air curtain generator of the present invention and a conventional refrigerator, and a curve indicated by a black dot is a graph of a conventional refrigerator and is white. The curve indicated by the dots is a graph of the refrigerator of the present invention.

As shown, in a conventional refrigerator, about 50% of the energy in the fridge is lost after about 10 seconds after the door is opened, while about 35% of the energy is lost in the refrigerator of the present invention.

Although the present invention has been described in the form of preferred embodiments, it should be understood that various modifications and variations are possible within the scope defined by the appended claims.

Claims (25)

Freezer; Cold room; Cold air generating means; Cold air circulation means comprising a cold air supply duct having at least one cold air supply port, a cold air recovery duct having at least one cold air recovery port, and a fan member; Composed of air curtain generating means, The air curtain generating means is provided adjacent to the door of the refrigerating compartment and has a cold air supply port for injecting cold air for the air curtain toward the lower side of the refrigerating compartment, the refrigerating compartment in the refrigerating compartment to extend to the front from the back of the refrigerating compartment. It is provided on the top of the communication with the cold air recovery duct, the cold air supply duct for the air curtain; It operates when the door of the refrigerating chamber is opened, and operates to stop when the door is closed, is installed in the cold air supply duct for the air curtain, consists of a fan member for the air curtain to generate cold air for the air curtain, The cold air generated by the air curtain is recovered through the cold air recovery port and the cold air recovery duct. The refrigerator of claim 1, wherein the fan member for the air curtain is a cross flow fan. The refrigerator according to claim 2, wherein the cross flow fan has a length substantially equal to an inner width of the refrigerating compartment. The refrigerator of claim 1, wherein the air curtain fan member is provided adjacent to a rear surface of the refrigerating compartment. The refrigerator according to claim 1, wherein the cold air supply duct for the air curtain has a cross-sectional area that gradually decreases from a portion holding the fan member for the air curtain to the cold air supply for the air curtain. The refrigerator according to claim 1, wherein the cold air supply port for the air curtain has a slit shape having a length substantially the same as an inner width of the refrigerating compartment. The cold air supply duct for the air curtain according to claim 1, wherein the cold air supply duct for the air curtain includes a retaining portion for holding the air curtain fan member therein, a horizontal portion extending from the holding portion adjacent to the front surface of the refrigerating compartment, and extending from the horizontal portion. And a curved portion bent downward at a predetermined curvature and a straight portion extending from the curved portion to ensure the straightness of the air curtain, and the end of the straight portion forms a cold air supply port for the air curtain. . 8. The refrigerator according to claim 7, wherein the horizontal portion of the cold air supply duct for the air curtain comprises a horizontal upper flat portion and an inclined lower flat portion. The refrigerator of claim 8, wherein at least one step is formed on the inclined lower flat portion. 9. The refrigerator according to claim 8, wherein the surface roughness of the inclined lower flat portion is greater than the upper flat portion. The refrigerator according to claim 7, wherein the straight portion of the cold air supply duct for the air curtain is formed to have a predetermined angle with respect to a vertical line toward the outside of the refrigerator. The refrigerator of claim 11, wherein the predetermined angle is in the range of 5 ° to 20 °. Freezer; Cold room; Cold air generating means; Cold air circulation means comprising a cold air supply duct having at least one cold air supply port, a cold air recovery duct having at least one cold air recovery port formed on a rear surface of the refrigerating compartment, and a fan member; Composed of air curtain generating means, The air curtain generating means, It is provided adjacent to the door of the refrigerating compartment and provided with a slit-shaped cold air supply port extending along the width direction of the refrigerating compartment for injecting cold air for air curtain toward the lower side of the refrigerating compartment, so as to extend from the back of the refrigerating compartment to the front A cold air supply duct provided on the top surface of the refrigerating compartment in the refrigerating compartment and in communication with the cold air recovery duct; It operates when the door of the refrigerating chamber is opened, and operates to stop when the door is closed, is installed in the cold air supply duct for the air curtain, consists of a fan member for the air curtain to generate cold air for the air curtain, One or more shelves are installed in the refrigerating compartment, and the total cross sectional area of the cold air recovery holes allocated to each of the storage spaces in the refrigerating compartment divided by the shelves is lower than the total cross sectional area of the cold air recovery holes allocated to the upper storage space. The total cross-sectional area of the cold air recovery port allocated to the space is determined to be larger, wherein the generated cool air for the air curtain is recovered through the cold air recovery port and the cold air recovery duct. The refrigerator according to claim 13, wherein the fan member for the air curtain is a cross flow fan, and the cross flow fan has a length substantially the same as an inner width of the refrigerating compartment. The refrigerator of claim 13, wherein the air curtain fan member is provided adjacent to a rear surface of the refrigerating compartment. The refrigerator according to claim 13, wherein the cold air supply duct for the air curtain has a cross-sectional area that gradually decreases from the portion holding the fan member for the air curtain to the cold air supply for the air curtain. The cold air supply duct for the air curtain according to claim 13, wherein the cold air supply duct for holding the air curtain includes: a holding portion for holding the fan member for the air curtain therein; a horizontal portion extending from the holding portion adjacent to the front surface of the refrigerating chamber; And a curved portion bent downward at a predetermined curvature and a straight portion extending from the curved portion to ensure the straightness of the air curtain, and the end of the straight portion forms a cold air supply port for the air curtain. . 18. The refrigerator according to claim 17, wherein the horizontal portion of the cold air supply duct for the air curtain comprises a horizontal upper flat portion and an inclined lower flat portion. The refrigerator of claim 18, wherein at least one step is formed at the inclined lower flat portion. 19. The refrigerator according to claim 18, wherein the surface roughness of the inclined lower flat portion is greater than the upper flat portion. The refrigerator according to claim 17, wherein the straight portion of the cold air supply duct for the air curtain is formed to have a predetermined angle with respect to a vertical line toward the outside of the refrigerator. The refrigerator of claim 21, wherein the predetermined angle is in the range of 5 ° to 20 °. The door side end of the lowest shelf installed in the refrigerating compartment is positioned to protrude toward the door rather than the installation position of the cold air supply port for the air curtain, and the door side end of the remaining shelf of the shelf is located in the cold air supply port for the air curtain. Refrigerator, characterized in that installed so as to retreat into the interior of the refrigerating compartment than the installation position. The refrigerator of claim 13, wherein the cold air recovery duct extends in a vertical direction along a central portion of the rear surface of the refrigerator, and is in direct communication with the refrigerating chamber through the cold air recovery port. Freezer; Cold room; Cold air generating means; Cold air circulation means comprising a cold air supply duct having at least one cold air supply port, a cold air recovery duct having at least one cold air recovery port formed on a rear surface of the refrigerating compartment, and a fan member; And an air curtain generating means, the air curtain generating means being provided adjacent to the door of the refrigerating compartment and extending along the width direction of the refrigerating compartment for injecting cold air for the air curtain toward the lower side of the refrigerating compartment. A supply port, provided on an uppermost surface of the refrigerating compartment in the refrigerating compartment so as to extend from the rear surface of the refrigerating compartment to the front surface, in communication with the cold air recovery duct, and a cold air supply duct for an air curtain; Operating when the door of the refrigerating chamber is opened, and operating to stop when the door is closed, Installed in the cold air supply duct for the air curtain, and consists of a fan member for the air curtain to produce cold air for the air curtain, One or more shelves are installed in the refrigerating compartment, and the total cross-sectional area of the cold air recovery holes allocated to each of the storage spaces in the refrigerating compartment divided by the shelves is lower than the total cross-sectional area of the cold air recovery holes allocated to the upper storage space. The total cross-sectional area of the cold air recovery port allocated to the space is determined to be larger, and thus the cold air for the air curtain generated is recovered through the cold air recovery port and the cold air recovery duct, The fan member for the air curtain is a cross flow fan, the cross flow fan has a length substantially the same as the inner width of the refrigerating chamber, The air curtain fan member is installed adjacent to the rear surface of the refrigerating chamber, and the air curtain cold air supply duct has a cross-sectional area that gradually decreases from the portion having the air curtain fan member to the air curtain cold air supply port. Has, The cold air supply duct for the air curtain is a retaining portion for holding the air curtain fan member therein, a horizontal portion extending from the holding portion adjacent to the front surface of the refrigerating compartment, and extending from the horizontal portion and being lowered to a predetermined curvature. And a straight portion extending from the curved portion to ensure straightness of the air curtain, and the end of the straight portion forms a cold air supply port for the air curtain, and the horizontal portion of the cold air supply duct for the air curtain. The part consists of a horizontal upper flat part and an inclined lower flat part, At least one step is formed in the inclined lower flat portion, The straight portion of the cold air supply duct for the air curtain is formed to have an angle of 5 ° to 20 ° with respect to the vertical line toward the outside of the refrigerator, The door side end of the lowest shelf installed in the refrigerating compartment is positioned to protrude toward the door rather than the installation position of the cold air supply port for the air curtain, and the door side end of the remaining shelf is more than the installation position of the cold air supply port for the air curtain. Installed to retract inward, And the cold air recovery duct extends in a vertical direction along a central portion of the rear surface of the refrigerator and is in direct communication with the refrigerating chamber through the cold air recovery port.