KR20050094236A - Open type freezing showcase - Google Patents

Abstract

The present invention relates to an open-type freezing showcase having an open compartment with an open front surface, and cools air by contacting an evaporator installed inside the main body, and discharges the cooled air from the upper front side of the main body and sucks it from the lower front side. The first row air curtain is formed to block, and the second row air curtain and the third row air are sucked from the front side of the upper body of the main body while circulating the air separately from the air forming the first row air curtain. It is characterized by having a duct structure to form a curtain, all layers of air curtain is recycled and formed stably by the circulating air, so that the escape of cold air and intrusion of outside air at all times during the day and night Storage space due to effective arrangement of components while increasing cooling efficiency due to excessive frost on the evaporator surface It will be best able to secure.

Description

Open type freezing showcase

The present invention relates to an open refrigeration showcase, in particular, all layers of air curtains are recycled and stably formed by circulating air, so that the escape of cold air or infiltration of outside air is thoroughly blocked at all times during the day and night, so that a large amount of the surface of the evaporator The present invention relates to an open refrigeration showcase in which the storage space is maximized by the effective arrangement of the components while the cooling efficiency is increased due to no frost.

In general, open-type showcases are installed in convenience stores or department stores, and store various products in the open front to circulate the cooled low-temperature air to keep them fresh and refrigerated, while enhancing the display effect of the stored products. It is.

The open showcase discharges cooling air from the top to the bottom to block the open front to form an air curtain. This is to prevent the escape of cold air from the storage compartment where the goods are displayed, and also to block the entry of outside air at room temperature including fine impurities.

In addition, in recent years, open refrigeration showcases are being used to store and display products requiring colder temperatures.

This open refrigerated showcase uses air cooled at a lower temperature than general open showcases to form an air curtain. Therefore, it is necessary to thoroughly prevent the outflow of cold air. For this purpose, two air curtains are provided on the front side of the air curtain by the cooling air. Will be formed separately.

1 is a cutaway side view for explaining the configuration of a conventional open refrigeration showcase.

As shown, the conventional open refrigeration showcase is a main body 101 by the earth output of the intake and exhaust fan (105, 109) to form three layers of air curtain (A1, A2, A3) in front of the open storage chamber 103 Air was discharged downward from the upper front side.

The first row air curtain A1 is formed while the air cooled through the evaporator 107 circulates, and the second row air curtain A2 and the third row air curtain A3 are formed by uncooled air. It was formed in front of the 1st row air curtain A1.

In addition, the second row air curtain A2 prevents the cold air of the first row air curtain A1 from escaping to the outside and prevents air and impurities at room temperature from penetrating into the storage chamber 103. The third row air curtain A3 served to reinforce the above-described role together with the second row air curtain A2.

However, in the related art, many problems have been caused because the intake and exhaust fan 109 installed on the main body 101 forms the third row air curtain A3 in a manner of sucking and discharging new air from the outside.

That is, there is a problem in that the volume of the product increases due to the installation of a separate intake and exhaust fan 109 in the upper portion of the main body 101 to supply air for forming the third row air curtain.

In addition, since the new air supplied from the outside to form the third row air curtain A3 is relatively high temperature, the temperature of the air constituting the first row air curtain A1 and the first row air curtain A2 is increased. There is a problem that the temperature of the storage chamber 103 is raised.

Furthermore, at night, it is common to lower the night curtain 111 to the outside of the air curtains A1, A2, and A3 to completely block the front of the open storage chamber 103 in order to effectively preserve the cold air of the storage chamber 103. However, in this case, the air at room temperature supplied from the outside to form the third row air curtain A3 is blocked by the night curtain 111 and is not discharged to the outside, so that the first row air curtain A1 and the second row The air flow of the air curtain A2 was disturbed while entering the storage chamber 103, thereby raising the internal temperature of the storage chamber 103.

In addition, there is a problem in that the cooling efficiency of the showcase is sharply lowered as the frost is thickened due to a large amount of air that is newly supplied from the outside and not yet cooled to come into contact with the surface of the evaporator 107.

On the other hand, in order to solve the problem as described above, even if it is possible to consider a method for circulating all the air forming the three-layer air curtain (A1, A2, A3) through the body 101, in this case, each air curtain ( Due to the duct structure that isolates and circulates the air forming A1, A2, and A3), the thickness of the rear wall and the bottom of the showcase is greatly increased, thereby reducing the space of the storage compartment 103 or increasing the volume of the entire product. It became difficult.

In addition, although it is a general phenomenon that frost is naturally caught on the surface of the evaporator 107 due to condensation of moisture contained in the air, a refrigerant having a relatively low temperature compared to other sections in a section in which the refrigerant is first introduced into the evaporator 107. Excessively frost is generated as the heat exchanges rapidly with air, resulting in a sharp drop in air flow and a drop in temperature performance.

Accordingly, the present invention has been proposed to solve the conventional problems as described above, the object of the present invention is to recycle all of the air forming the three-ply air curtain while separating and smoothly circulating smoothly, while the storage space It is to provide an open refrigeration showcase that can be secured.

In order to achieve the above object, in the open type refrigeration showcase according to the technical idea of the present invention, in the open type refrigeration showcase having an open front, the air is cooled by contacting an evaporator installed inside the main body, and cooled air. Is discharged from the front upper part of the main body and sucked from the lower front side to form a first row air curtain that blocks the front of the storage chamber, and is discharged from the front upper part of the main body while circulating air separately from the air forming the first row air curtain. And a duct structure which sucks from the lower front side and forms a second row air curtain and a third row air curtain, respectively, on the front side of the first row air curtain.

Here, the duct structure is a first duct which communicates with the lower side, the rear side and the upper side of the storage chamber from the front side of the lower part of the main body to the front side of the upper part of the main body via an evaporator, and forms a first row air curtain; A second duct communicating from the front side of the lower part of the main body to the front side of the main body via the lower side, the rear side, and the upper side of the first duct, and forming a second row air curtain; and the second duct of the first duct together with the second duct. A third duct which divides and passes through the same layer on the lower side and the same row on the rear side, and then communicates from the front side of the lower part of the main body to the front side of the main body via the upper side of the second duct and forms a third row air curtain; A first intake and exhaust fan installed in the first duct to provide the output power and the suction force for forming the first row air curtain while circulating the air in the first duct; A second intake and exhaust fan installed in the second duct to provide air output and suction force for forming the second row air curtain while circulating air in the second duct; and a second intake fan installed in the third duct to circulate air in the third duct It is preferably configured to include a third intake and exhaust fan to provide the output and suction power to form a third row air curtain.

In addition, the first intake fan and the second intake fan is disposed side by side in the central portion of the lower body, the third intake fan is preferably disposed in the front lower portion of the main body.

In addition, the evaporator is installed inside the first duct via the rear side of the storage chamber, the refrigerant movement pipe to which the refrigerant moves, and is arranged to be coupled to the surface of the refrigerant movement tube at regular intervals in contact with the air flowing in the first duct Consists of heat exchange fins, wherein the refrigerant movement pipe is formed of a parallel stage divided into multiple stages so that the incoming refrigerant is branched and move, the heat exchange fins are divided into each stage of the parallel section of the refrigerant movement pipe, respectively, In the first column of the refrigerant moving tube in which the refrigerant is first introduced, it is preferable that two or more types of heat exchanger fins having a larger upper and lower width and smaller heat exchanger fins are arranged alternately so as to form a wider spacing of the heat exchanger fins.

In addition, the refrigerant moving pipe is divided into three stages or four stages, the heat exchange fins may be one of two kinds of the upper and lower widths are arranged alternately one over the other.

Hereinafter, exemplary embodiments of the present invention as described above will be described in detail with reference to the accompanying drawings.

2 is a cutaway side view of an open refrigeration showcase according to the present invention.

As shown, the open-type refrigeration showcase of the present invention is configured to be stably formed by the air is recycled while all three layers of the air curtain (C1, C2, C3) formed on the front of the storage chamber (11) do.

In addition, all the air for forming the three-ply air curtain (C1, C2, C3) is circulated to be isolated in the main body 1, but is configured so that the storage space of the storage chamber 11 is not reduced.

Hereinafter, the configuration of the open-type refrigeration showcase according to the present invention will be described in detail.

Figure 3a is a side cross-sectional view cut in side to explain the configuration of the present invention, Figure 3b is a plan view showing the arrangement of the intake and exhaust fan according to the present invention.

As shown, the present invention is the main body 1 and the evaporator 2, the first duct (3), the second duct (4), the third duct (5), the first intake fan (31) forming a duct structure ), A second intake and exhaust fan 41, and a third intake and exhaust fan 51.

The main body 1 is formed such that a front side of the main body 1 is opened by a storage panel 11a for storing goods, and the ducts inside the main body 1 outside the storage chamber 11. 3, 4, 5 is provided for the installation space is provided.

In addition, the upper front portion and the lower front portion of the main body 1 are formed with an outlet portion and an inlet portion which are opened toward the lower side and the upper side, respectively, while communicating with the installation space, and are formed by the ducts 3, 4 and 5, respectively. The discharge ports 33a, 43a, 53a and the suction ports 33b, 43b, 53b respectively formed are located.

The evaporator 2 is installed in the rear installation space of the storage chamber 11 to cool the air while exchanging heat with air in contact with the surface thereof.

The duct structure is for forming air curtains C1, C2, and C3 on the front side of the storage chamber 11 while circulating air. The first duct 3 and the first intake fan 31, The first row air curtain C1 and the second row air curtain while the second duct 4 and the second intake fan 41, the third duct 5 and the third intake fan 51 are formed in a pair. (C2) and the third row air curtain C3 are formed, respectively.

In this case, the ducts (3, 4, 5) can be provided by installing the existing ducts of the tubular body formed inside the hollow, but in various forms so as to increase the space utilization in the main body (1) installation space is limited Plates 34a, 34b, 34c, 44a, 44b, 44c, 44d, 44e and 44f are preferably provided by assembling directly inside the main body 1. Therefore, in the present embodiment, a passage through which air flows by various plates 34a, 34b, 34c, 44a, 44b, 44c, 44d, 44e, and 44f is provided and described as a duct.

Accordingly, in the present invention, the first duct 3, the second duct 4 and the third duct 5 are formed by the plates 34a, 34b, 34c, 44a, 44b, 44c, 44d, 44e, and 44f. It is provided to circulate air while passing through the lower side, the rear side and the upper side of the storage chamber 11, the multi-layer structure in which the ducts (3, 4, 5) are stacked up and down in the lower and upper side of the storage chamber 11 The rear side is configured to form a multi-row structure back and forth.

Here, the second duct 4 and the third duct 5 are formed in different layers on the upper side of the storage chamber 11, but the lower duct 4 and the third duct 5 are on the same layer on the lower side of the storage chamber 11. The rear side of (11) has a unique arrangement which is partially assigned to the same column with each other.

Due to this unique arrangement, the installation width required for the installation of the second duct 4 and the third duct 5 is reduced in half from the lower side and the rear side of the storage compartment. In this case, the second duct 4 and the third duct 5 are arranged in different layers and different rows from the first duct 3, but are separated from each other by the insulating plates 44a, 44b, 44c, The installation area is divided by 44d).

The isolation plates 44a, 44b, 44c, and 44d are plated in one duct that has formed only one passage for airflow at the lower side and the rear side, and are separated from each other by the second duct 4 and the third duct. (5) will be formed.

This duct structure will be further described later step by step.

As described above, the present invention provides the first duct 3 and the second duct separated from each other by the plates 34a, 34b, 34c, 44a, 44b, 44c, 44d, 44e, and 44f in the installation space inside the main body 1. 4) and the third duct 5 is provided so that air is circulated without mixing with each other, three layers of air curtains C1, C2, and C3 are formed in front of the storage chamber 11.

For reference, in the drawing, the flow of air is indicated by an arrow, and the air circulating in the first duct 3 to form the first row air curtain C1 has a mark "○" on the arrow, and the second The air circulating in the second duct 4 to form the thermal air curtain C2 is marked with an "X" on the arrow, and the third duct 5 in order to form the third row air curtain C3. The air circulating is distinguished by adding "▽" notation on the arrow.

3, air flowing through the second duct 4 and air flowing through the third duct 5 are shown to flow in a mixed state in the lower side and the rear side of the storage chamber 11, but the second duct ( 4 and the third duct 5 are arranged on the same floor below the storage chamber 11 and in the same row at the rear of the storage chamber 11, for convenience, so the second duct 4 and the third duct 5 Are tightly isolated from each other by the isolation plates 44a, 44b, 44c, 44d to form different passages for airflow.

Meanwhile, the first intake fan 31, the second intake fan 41, and the third intake fan 51 are installed in the first duct 3, the second duct 4, and the third duct 5, respectively. do.

Here, the first intake fan 31 and the second intake fan 41 are arranged side by side in the front and rear central portion, and the third intake fan 51 is the first intake fan 31 and the second intake exhaust. Avoiding the installation area of the fan 41 is installed in the front of the lower part of the main body (1) small but remaining idle space.

Here, the third intake fan 51 is installed to be smaller than the first intake fan 31 and the second intake fan 41 to minimize the installation space.

At this time, the flow rate of air is preferably formed in the order of the first row air curtain (C1), the second row air curtain (C2), the third row air curtain (C3) in order that the third intake fan 51 Even if installed with a capacity, there is no problem with the air flow.

As such, when the third intake fan 51 utilizes the idle space of the lower front side of the main body 1, the intake / exhaust fan is installed on the upper side of the main body 1 as in the prior art without reducing the storage space of the storage chamber 11. There is no need to provide a separate installation space in order to prevent the volume increase of the entire product.

Hereinafter, the duct structure of the present invention will be described step by step.

Figure 4a is a side cross-sectional view for explaining a first duct according to the present invention, Figure 4b is a plan sectional view for explaining a first duct according to the present invention.

As shown, the first duct 3 is communicated from the front side of the lower part of the main body 1 to the front side of the upper part of the main body 1 via the lower side, the rear side and the upper side of the storage chamber 11.

Here, the first duct (3) is formed by the plates 34a, 34b, 34c surrounding the outer space of the storage chamber 11 by a predetermined distance, and is formed by the plates (34a, 34b, 34c) The first discharge port 33a and the first suction port 33b through which air is discharged and sucked, respectively, are also naturally formed in the upper front part and the lower front part of the main body 1.

In addition, the evaporator (2) and the first intake fan 31 is installed in the interior space of the first duct (3), the first intake fan 31 is appropriately spaced at a predetermined interval to fit the overall left and right width of the present invention. Quantity is installed.

By this configuration, the air flows smoothly while being in contact with the evaporator 2 along the first duct 3 by the suction and the earth output of the first intake and exhaust fan 31, in the process of the first discharge port The first row air curtain C1 is formed on the entire front of the storage chamber 11 when discharged from the 33a and sucked in the first suction port 33b.

Figure 5a is a side cross-sectional view for explaining a second duct according to the present invention, Figure 5b is a plan sectional view for explaining a second duct according to the present invention.

As shown, the second duct (4) is the main body (1) from the front side of the lower part of the main body (1) via the lower, rear and upper side of the outer side of the first duct (3) surrounding the storage chamber (11) ) It communicates with the front side of the upper part.

The second duct 4 is arranged in a layer and a column different from the first duct 3, and the second duct 4 is arranged in the same layer and a row in the lower side and the rear side, respectively.

Thus, in order to arrange the second duct 4 and the third duct 5 in the same layer on the lower side, the insulating plates 44c and 44d cross the left and right in the lower space outside the first duct 3 in the front-rear direction. In order to be installed long and to be arranged in the same row as the rear side, the insulating plate members 44c and 44d are also arranged on the lower side, followed by the upper and lower sides while crossing the left and right sides of the rear space outside the first duct 3. Direction is installed long.

As a result, the second duct 4 is formed along the lower side of the first duct 3 and the center of the rear side space.

In addition, in the upper side, the second duct 4 is formed to be wider by allocating all two layers, which are upper spaces outside the first duct 3, thereby forming the second duct 4 in a narrow width from the lower side and the rear side. The flowing air spreads widely on the upper side and is ready to form the second row air curtain C2 having a wide width from side to side.

Also, as in the first duct 3, the second discharge port 43a through which air is discharged and sucked to the upper front side and the lower front side of the main body 1 by the plate members 44e and 44f constituting the second duct 4, respectively. ) And the second suction opening 43b are naturally formed.

The second intake and exhaust fan 41 is installed in a suitable quantity in the space inside the second duct 4, is installed at the same height as the first intake and exhaust fan 31, but the first duct (3) by the fan cover 45 ) Is isolated from the space.

By such a configuration, air is smoothly circulated along the second duct 4 by suction and earth output of the second intake and exhaust fan 41, and in this process, air is discharged from the second discharge port 43a and is discharged. The second row air curtain C2 is formed on the front side of the first row air curtain C1 while being sucked into the second suction port 43b.

Figure 6a is a side cross-sectional view for explaining a third duct according to the present invention, Figure 6b is a plan sectional view for explaining a third duct according to the present invention.

As shown, the third duct 5 is upper part of the main body 1 from the front side of the lower part of the main body 1 via the lower side, the rear side and the upper side of the second duct 4 of the first duct 3. It communicates with the front side of.

The third duct 5 is arranged in a different layer and column than the first duct 3. However, the second duct 4 is disposed in the same layer and the same row at the lower side and the rear side, and for this purpose, the third duct 5 is allocated a central region in the lower side and the rear side space outside the first duct 3. Different areas are allocated to the left and right sides of the formed second duct 4 outside.

In addition, the third duct 5 is formed in the upper side to receive all three layers of the upper side of the second duct 4 outside, so that the air flowing through the third duct 5 in the left and right narrow width is upward. It spreads out again and prepares to form a third row air curtain C3 having a wide left and right width.

In addition, similar to the first duct 3 or the second duct 4, the air flowing through the third duct 5 is discharged and sucked to the upper front side and the lower front side of the main body 1, respectively. ) And the third suction port 53b are naturally formed.

The third intake fan 51 is installed in an appropriate amount in the inner space of the third duct 5 and avoids an area in which the first intake fan 31 and the second intake fan 41 are installed, the lower part of the main body 1. It is arranged in the front side.

As a result, the air flows smoothly along the third duct 5 by the suction and the earth output of the third intake and exhaust fan 51, and in this process, the air is discharged from the third discharge port 53a and the third intake port. The third row air curtain C3 is very stably formed in front of the second row air curtain C2 while being sucked into the 53b.

Figure 7a is a side view for explaining the configuration of the evaporator according to the present invention, Figure 7b is a front view for explaining the configuration of the evaporator according to the present invention.

As shown, the evaporator 2 according to the present invention is installed in the first duct 3 via the rear side of the storage chamber 11, and the refrigerant moving tubes 21a, 21b, 21c through which the refrigerant moves. And heat exchange fins 23a and 23b arranged and coupled to the surfaces of the refrigerant moving tubes 21a, 21b, and 21c at predetermined intervals to be in contact with the air flowing in the first duct 3.

The refrigerant moving pipes 21a, 21b, and 21c are branched in parallel to allow the refrigerant to move simultaneously in several paths.

Here, the refrigerant moving pipe (21a, 21b, 21c) is formed in the number of stages branched by a number appropriately branched to the height of the evaporator (2) to be installed, in this embodiment the refrigerant moving pipe (21a, 21b, 21c) Branched into three tiers.

Further, the heat exchange fins 23a and 23b are also appropriately divided into multiple stages of the refrigerant movement tubes 21a, 21b and 21c branched into multiple stages, and are coupled to the refrigerant movement tubes 21a, 21b and 21c of each stage.

In addition, the heat exchange fins 23a and 23b are formed of a larger upper and lower width so that the interval between the heat exchange fins 23a and 23b is wider in the refrigerant moving tubes 21a, 21b and 21c in the first row where the refrigerant is first introduced into each stage. Two types of the first heat exchanger 23a and the second heat exchanger pins 23b having small upper and lower widths are provided and alternately arranged one by one at each stage.

Thus, in the first row of the refrigerant moving tubes 21a, 21b, 21c of each stage into which the low-temperature refrigerant is first introduced, the heat exchange fins 23a, 23b are substantially wider at intervals between the heat exchange fins 23a having a substantially larger upper and lower width. As a result, the phenomenon that the air is stagnated by the surface friction is reduced, and the heat exchange area between the heat exchange fins 23a and 23b and the air is also reduced to suppress rapid heat exchange.

In addition, the wide gap formed by the heat exchange fins 23a having a large upper and lower width in the first row of the refrigerant moving tubes 21a, 21b, and 21c allows a gap in which air can flow smoothly even if some frost is applied. do.

As a result, excessive frost is prevented from occurring in the initial inlet section of the refrigerant into which the refrigerant having a lower temperature than the other sections of the evaporator 2 flows, and a gap in which air can flow smoothly even if some frost is caught. It is possible to tolerate, it is possible to prevent the degradation of the temperature performance.

Here, the refrigerant moving pipe (21a, 21b, 21c) may be formed in two or more stages of multi-stage according to the height of the evaporator (2) to be installed, the heat exchange fin (23a) having a large upper and lower width and the heat exchange fin having a small upper and lower width ( By adjusting the order in which 23b) is alternated, the distance between the heat exchange fins 23a having a large upper and lower width in the section in which the refrigerant is first introduced may be adjusted.

The operation of the open-type refrigeration showcase according to the present invention configured as described above will be described in detail with reference to the accompanying drawings based on the air flow.

First, when power is applied to the present invention and the first intake fan 31 is rotated, suction force is generated, and air around the front of the storage chamber 11 is sucked through the first intake port 33b. Then, the sucked air is guided along the first duct 3 while being sucked into, discharged from, and discharged into the first intake fan 31 while flowing inside the main body 1. The earth output continues to flow inside the first duct (3).

Thereafter, the air flowing in the first duct 3 is cooled by low temperature air while being in contact with the surface of the evaporator 2, and the first discharge port formed in the front side of the upper part of the main body 1 continues to flow in the first duct 3. It is discharged through 33a.

Here, the evaporator 20 is connected to the refrigerant movement pipes 21a, 21b, 21c branched in parallel in multiple stages and heat exchange fins 23a, 23b, which are partially divided in appropriate stages and partially widened in a section in which the refrigerant is initially introduced. This prevents the air from being rapidly cooled and prevents the frost from being excessively caught. Also, even if the frost is caught at a wide interval between the heat exchange fins 23a having a large upper and lower widths, the air gap can flow smoothly. Guaranteed.

Thereafter, the discharged air is sucked into the first air intake port under the influence of the suction force of the first intake exhaust fan 31, and a first row air curtain C1 is formed on the front side of the storage chamber 11.

As such, after the first row air curtain C1 is formed, the cooled air continues to circulate along the first duct 3 to maintain a state in which the first row air curtain C1 is formed. By the first row air curtain C1, it is possible to prevent cold air from escaping from the inside of the storage chamber 11 or entering outside air at room temperature into the storage chamber 11.

Meanwhile, like the first intake fan 31, the second intake fan 41 also operates at the same time as the power is applied and sucks air through the second intake port 43b, whereby the air is along the second duct 4. It is guided and continues to flow and is discharged through the 2nd discharge port 43a formed in the upper front side of the main body 1. As shown in FIG.

The discharged air is sucked back into the second suction port 43b by the suction force of the second intake fan 41, and the second row air curtain C2 is formed on the front side of the first row air curtain C1.

As such, after the second row air curtain C2 is formed, air circulates along the second duct 4 to maintain the second row air curtain C2 continuously. (11) It is further prevented that the cold air is separated from the inside or outside air at room temperature enters the interior of the storage chamber (11).

At this time, the second row air curtain (C2) is not in direct contact with the evaporator (2), but is partially in contact with the air forming the first row air curtain (C1) to slightly lower the temperature to maintain a lightly cooled state do.

Meanwhile, similarly to the first intake fan 31 and the second intake fan 41, the third intake fan 51 also operates at the same time as power is applied to suck air through the third intake port 53b, thereby being sucked in. Air is guided along the third duct (5) and continues to flow through the third discharge port (53a) formed on the front side of the main body (1).

Air discharged in this way is influenced by the suction force by the third intake fan 51 and is sucked into the third intake port 53b to form the third row air curtain C3 in front of the second row air curtain C1. do.

As such, after the third row air curtain C3 is formed, since the used air circulates along the third duct 5 and is continuously recycled, the first row air curtain C3 is continuously maintained. Together with the thermal air curtain C1 and the second row air curtain C2, it is possible to further prevent cold air from escaping from the inside of the storage chamber 11 or invasion of outside air at room temperature into the interior of the storage chamber 11.

As described above, in the present invention, since all the air is recycled while being recycled, it is possible to form the air curtains C1, C2, and C3 in a very stable state of the air flow, so as to effectively prevent the escape of cold air or invasion of outside air. do.

In addition, since the air that has already been cooled to a certain degree or more is circulated and recycled, a large amount of air at room temperature, which is not cooled outside, is newly included, and the air at room temperature is in contact with the surface of the evaporator 2, causing a large amount of frost. Can be prevented.

The above phenomenon was particularly severe with the disturbance of the air flow when the night curtain C4 (see FIG. 2) was lowered to completely block the front of the storage compartment 11 at night.

The preferred embodiment of the present invention has been described above. The present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, the open-type refrigeration showcase according to the present invention can effectively preserve the temperature of the storage compartment because it is not necessary to introduce external air at room temperature in order to form three-ply air curtains.

In addition, even when the night curtain is lowered to completely block the front of the storage unit, the air flow is not disturbed or only the low-temperature air that is already cooled without invading the outside air continuously circulates and contacts the evaporator. The thick frost on the surface can be prevented, thereby increasing the cooling efficiency.

In addition, the present invention has a duct structure capable of circulating the three-ply air curtain in an isolated state, but the effective placement of the components does not increase the overall volume or reduce the storage space of the storage compartment.

In addition, the present invention prevents the deterioration of air flow due to frost caused by the configuration of the evaporator itself, eliminating the section of the heat exchange with the air more rapidly, as well as the cooling effect on the air continuously There is a sustainable effect.

1 is a side view cut away for explaining the configuration of a conventional open refrigeration showcase.

Figure 2 is a cutaway side view of the open refrigeration showcase according to the present invention.

Figure 3a is a side cross-sectional view cut away to illustrate the configuration of the present invention.

Figure 3b is a plan sectional view showing the arrangement of the intake and exhaust fan according to the present invention.

Figure 4a is a side cross-sectional view for explaining a first duct according to the present invention.

Figure 4b is a plan sectional view for explaining the first duct according to the present invention.

Figure 5a is a side cross-sectional view for explaining a second duct according to the present invention.

Figure 5b is a plan sectional view for explaining the second duct according to the present invention.

Figure 6a is a side cross-sectional view for explaining a third duct according to the present invention.

Figure 6b is a plan sectional view for explaining a third duct according to the present invention.

* Description of the symbols for the main parts of the drawings *

1: body 2: evaporator

3: first duct 4: second duct

5: 3 duct 11: storage room

11a: Storage panel 34a, 34b, 34c, 44a, 44b, 44c, 44d, 44e, 44f: Plate material

31: first intake and exhaust fan 33a: first discharge port

33b: first intake port 41: second intake and exhaust fan

43a: 2nd air outlet 43b: 2nd suction fan

51: third intake and exhaust fan 53a: third discharge port

53b: third intake port

Claims (5)

In the open refrigeration showcase having a storage compartment with the front open, The air is cooled by contacting the evaporator installed inside the main body, and the cooled air is discharged from the front upper side of the main body and sucked from the lower front side to form a first row air curtain that blocks the front of the storage chamber. The second row air curtain and the third row air curtain are respectively discharged from the front upper side of the main body and sucked from the lower front side while circulating air separately from the air forming the first row air curtain. Open type refrigeration showcase consisting of having a duct structure to form. The method of claim 1, wherein the duct structure, A first duct communicating from the front side of the lower part of the main body to the lower side, the rear side and the upper side of the storage chamber and to the front side of the upper part of the main body via an evaporator to form a first row air curtain; A second duct communicating from the front side of the lower part of the main body to the front side of the upper part of the main body via the lower side, the rear side, and the upper side of the first duct, and forming a second row air curtain; The same layer as the lower side of the first duct and the same row as the rear side are divided together with the second duct, and then communicated from the front side of the lower part of the main body to the front side of the upper part of the main body via the upper side of the second duct. A third duct forming a three row air curtain; A first intake and exhaust fan installed in the first duct and circulating air in the first duct, the first intake and exhaust fan providing the output power and suction force for forming the first row air curtain; A second intake and exhaust fan installed in the second duct and circulating air in the second duct, the second intake and exhaust fan providing the output power and the suction force for forming the second row air curtain; And a third intake and exhaust fan installed in the third duct, the third intake and exhaust fan providing circulation power and suction force to form a third row air curtain while circulating air in the third duct. The method of claim 2, The first intake fan and the second intake fan is arranged side by side left and right side in the lower portion of the main body, the third intake refrigeration showcase, characterized in that arranged in the front lower portion of the main body. The method of claim 2, The evaporator is installed inside the first duct via the rear side of the storage chamber, the heat exchanger is coupled to the refrigerant moving pipe for moving the refrigerant and the air flowing through the first duct arranged in a predetermined interval on the surface of the refrigerant moving pipe Consisting of pins, The refrigerant moving tube is formed of a parallel section divided into multiple stages so that the incoming refrigerant can branch and move, The heat exchange fins are divided and coupled to respective stages of the parallel section of the refrigerant moving tube, and the two or more types of the upper and lower widths are smaller and larger so that the arrangement interval of the heat exchange fins is wider in the refrigerant moving tube of the first row in which the refrigerant is first introduced at each stage. An open-type refrigeration case, characterized in that the heat exchange fins are arranged alternately. The method of claim 4, wherein The refrigerant moving tube is divided into three or four stages, the heat exchange fin is an open type refrigeration case, characterized in that the two upper and lower widths are arranged in alternating one by one.