JP2017029604A - Low-temperature showcase - Google Patents

Abstract

[Problem] To provide a low-temperature showcase capable of forming an air curtain of cold air and an air curtain of room temperature air at the front opening, and capable of preventing condensation by appropriately discharging room temperature air to the outside of the door unit when a door unit is attached. [Solution] A door unit 40 is detachably attached to the front opening 13, and when the door unit 40 is not attached, an air curtain of cold air is formed at the front opening 13, and an air curtain of room temperature air can be formed in front of the air curtain of cold air, and when the door unit 40 is attached to the front opening 13, the cold air outlet 30 and the cold air inlet 31 are located on the display room 15 side of the door unit 40, and the room temperature air outlet 34 and the room temperature air inlet 35 are located on the outside of the door unit 40. [Selected Figure] Figure 2

Description

  The present invention relates to a low-temperature showcase that displays products in a display room having a front opening, and particularly relates to a low-temperature showcase that forms a cold air curtain and a room temperature air curtain in a front opening.

  Conventionally, open showcases installed in convenience stores, supermarkets, etc. are composed of a heat insulating wall with a substantially U-shaped cross section and a side plate attached to the side of this heat insulating wall. By partitioning, a duct and a display chamber having an open front are formed. A shelf for displaying products is installed in the display room, and an evaporator is disposed in the duct. The cool air cooled by the evaporator is discharged from the cool air outlet at the upper edge of the front opening, The air curtain by the cold air was formed in the opening by sucking from the cold air suction port at the edge (see, for example, Patent Document 1).

  In some cases, an outer layer discharge port is formed in front of the cold air discharge port, and air is discharged from the outer layer discharge port to form a protective air curtain on the front side of the cold air curtain.

JP 2012-161345 A

  In such an open showcase, since the front of the display room is open, it is easy for the customer to take out the product, and the effect on sales of the product is extremely high, but cold air leakage from the display room is significant. There is a problem. In order to prevent this, an air curtain with cold air is formed in the front opening, but it is unavoidable that air leaks and outside air enters, leading to a decrease in cooling effect and an increase in power consumption. There was a problem.

Therefore, in Patent Document 1, the door can be attached to the front opening of the open showcase. By attaching the door so that the opening can be opened and closed, leakage of cold air and intrusion of outside air can be prevented or reduced.
However, when forming a protective air curtain, only the outside air is discharged from the outer layer discharge port, so it is not possible to efficiently apply the outside air to the front side of the door, and in particular, condensation occurs below the door. Have the problem of

  The present invention has been made in view of the above points, and when used as an open showcase, a cold air curtain and a normal temperature air curtain can be formed in the front opening, and a door unit is mounted. In such a case, the object is to provide a low temperature showcase capable of preventing the occurrence of condensation by properly discharging cool air to the display room side of the door unit and normal temperature air to the outside of the door unit. To do.

  In order to achieve the above object, the present invention comprises a heat insulating wall having a substantially U-shaped cross section and a side plate attached to a side surface of the heat insulating wall, and the inside of the heat insulating wall is partitioned by an inner panel, thereby providing a duct. And a display room having a front opening, a partition plate for partitioning the inside of the duct into two flow paths is provided inside the duct, and an evaporator is disposed inside the one flow path. A cold air duct, and the other flow path is a room temperature air duct, provided at the upper front end of the front opening and provided at the lower front end of the front opening and communicating with the cold air duct. A cold air inlet port communicating with the cold air duct, a room temperature air outlet port provided in front of the cold air outlet port of the front opening and communicating with the room temperature air duct, and a front side of the cold air inlet port of the front opening A normal temperature air suction port that communicates with the normal temperature air duct, and a door unit is detachably provided in the front opening, and the evaporator is cooled from the cold air discharge port by the evaporator when the door unit is not mounted. The cold air is discharged and sucked from the cold air suction port to form a cold air curtain in the front opening, and room temperature air is discharged from the room temperature air discharge port and sucked from the room temperature air suction port. An air curtain for room temperature air can be formed on the front side of the cold air curtain, and the cold air outlet and the cold air inlet are on the display chamber side of the door unit with the door unit attached to the front opening. The room temperature air discharge port and the room temperature air suction port are disposed outside the door unit.

  Moreover, the said structure WHEREIN: The said duct for cold air and the said duct for normal temperature air are provided with the completely isolate | separated flow path.

  Further, in the above configuration, the cold air duct and the room temperature air duct are merged inside the cold air inlet and the room temperature air inlet, and from the upstream side of the cold air from the evaporator of the cold air duct. It has the separated flow path, It is characterized by the above-mentioned.

  Moreover, the said structure WHEREIN: The said normal temperature air duct is arrange | positioned at least in the back side of the said cool air duct, It is characterized by the above-mentioned.

  Moreover, the said structure WHEREIN: The said door unit is provided with the pair of door supported by the flame | frame, Each said door is a double-opening type door, It is characterized by the above-mentioned.

According to the present invention, when the door unit is detachably provided in the front opening and the door unit is not mounted, a cold air curtain is formed in the front opening, and a room temperature air curtain is formed on the front side of the cold air curtain. By forming the double air curtain in this way, the inside and outside of the display room can be shut off at the front opening of the open showcase, and the internal temperature of the display room can be kept constant. It is possible to hold it.
In addition, when the door unit is attached, the front opening is covered with the door unit, so that the inside and outside of the display room can be completely blocked, and the temperature inside the display room is kept constant. It can hold | maintain and can improve cooling efficiency.
Furthermore, a cold air curtain is formed inside the display unit of the door unit, and an air curtain made of room temperature air is formed outside the door unit, so that the room temperature air curtain is reliably formed outside the door unit. Therefore, it is possible to always apply normal temperature air to the outer surface of the door, and it is possible to reliably prevent condensation on the outer surface of the door.

It is side surface sectional drawing which shows embodiment in the case of using the low-temperature showcase which concerns on this invention as an open showcase. It is side surface sectional drawing which shows embodiment at the time of attaching a door unit to the low-temperature showcase which concerns on this invention. FIG. 3 is a front view of FIG. 2. It is side surface sectional drawing to which the lower end part of the door unit of FIG. 2 was expanded. It is side surface sectional drawing to which the upper end part of the door unit of FIG. 2 was expanded. It is a perspective view at the time of seeing from upper direction in the state which opened the door.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a side sectional view showing an embodiment when the low-temperature showcase according to the present invention is used as an open showcase. FIG. 2 is a side sectional view showing an embodiment when the door unit is mounted on the low-temperature showcase according to the present invention, and FIG. 3 is a front view of FIG. 4 is an enlarged side sectional view of the lower end portion of the door unit of FIG. 2, and FIG. 5 is an enlarged side sectional view of the upper end portion of the door unit of FIG.
The low-temperature showcase 1 of this embodiment is installed in a store such as a convenience store or a supermarket.

As shown in FIG. 1, the low-temperature showcase 1 includes a heat insulating wall 10 having a substantially U-shaped cross-section covering the upper surface, the back surface, and the lower surface with the front surface open, and heat insulating properties attached to the outer surface side of the heat insulating wall 10 at the installation site. Side plate 11. An inner panel 12 is provided inside the heat insulating wall 10 so as to have a predetermined gap with respect to the heat insulating wall 10.
A bottom plate 14 extending toward the front opening 13 is integrally attached to the lower end of the inner panel 12, and the inside of the inner panel 12 and the bottom plate 14 serves as a display chamber 15 having the front opening 13. .

A space between the inner panel 12 and the bottom plate 14 and the heat insulating wall 10 is a duct 16. In the present embodiment, a partition plate 17 is provided inside the duct 16 and is configured to completely separate the inside of the duct 16 into two flow paths. Of the duct 16, the front side of the partition plate 17 is a cool air duct 18, and the back side of the partition plate 17 is a room temperature air duct 19.
In the present embodiment, the room temperature air duct 19 is disposed on the back side of the cold air duct 18, that is, between the heat insulating wall 10 and the partition plate 17.

Further, inside the display chamber 15, a pair of brackets 20 that are detachably attached to a support column (not shown) provided on the front side of the inner panel 12 located on the back side of the display chamber 15, and the bracket 20 is instructed. A plurality of shelves 21 are installed.
Further, a deck pan 22 is disposed on the upper surface of the bottom plate 14, and products are displayed on the upper surfaces of the shelf plate 21 and the deck pan 22.
In the present embodiment, the deck pan 22 is also included in the concept of the shelf board 21 for displaying products.

  Further, the shelf board 21 and the deck pan 22 can be drawn forward as indicated by a one-dot chain line in FIG. 1, and when the products are replenished to the upper surfaces of the shelf board 21 and the deck pan 22, the front surface of the display chamber 15 is provided. It is configured to be able to work by pulling forward from the opening 13. When the deck pan 22 is pulled forward, the deck pan 22 is pulled out with a predetermined gap with respect to the lower edge of the front opening 13 of the display chamber 15.

  Further, a canopy 23 is attached to the upper front end portion of the inner panel 12 over the entire width of the front opening 13, and an illumination lamp 24 that illuminates the inside of the display chamber 15 is attached to the inside of the canopy 23. An upper panel 25 is attached to the front side of the canopy 23 so as to cover the upper side of the front opening 13 of the display chamber 15, and a thermometer 26 for displaying the internal temperature of the display chamber 15 is attached to the upper panel 25. It has been.

Further, a cold air discharge port 30 is formed at the front end of the canopy 23 so as to communicate with the cold air duct 18 and blow out the cold air inside the cold air duct 18 to the display chamber 15. Further, a cold air suction port 31 communicating with the cold air duct 18 is formed at the front end portion of the bottom plate 14.
Further, an evaporator 32 of the cooling device is disposed inside the cool air duct 18 on the back side of the inner panel 12, and a cool air blower 33 is disposed inside the cool air duct 18 below the bottom plate 14. is set up.

In addition, a room temperature air discharge port 34 located in front of the cold air discharge port 30 is formed between the canopy 23 and the upper panel 25. In addition, a normal temperature air suction port 35 located in front of the cold air suction port 31 is formed at the front end of the bottom plate 14.
A room temperature air blower 36 is installed below the back side of the room temperature air duct 19. The room temperature air blower 36 may be installed at any position within the room temperature air duct 19.

Then, by driving the cool air blower 33, the cool air exchanged with the evaporator 32 rises inside the cool air duct 18 and is discharged from the cool air discharge port 30 toward the front opening 13. The cool air discharged to the front opening 13 is sucked into the cool air duct 18 from the cool air suction port 31, thereby forming an air curtain by the cool air in the front opening 13, and one of the cool air air curtains. The part is circulated inside the display chamber 15.
The inner panel 12 has a cold air outlet (not shown), and the inside of the display chamber 15 is cooled to a predetermined temperature by a part of the cold air curtain and the cold air blown out from the cold air outlet.

On the other hand, by driving the room temperature air blower 36, the air inside the room temperature air duct 19 rises up the room temperature air duct 19 and is discharged from the room temperature air discharge port 34 toward the front opening 13. The room temperature air discharged to the front opening 13 is sucked into the inside of the room temperature air duct 19 from the room temperature air inlet 35, whereby an air curtain made of room temperature air is formed in the front opening 13 on the front side of the cold air curtain. Will be formed.
That is, in the present embodiment, a double air curtain is formed in the front opening 13 of the display chamber 15 by cold air and room temperature air.
The above is the configuration of the open showcase 1.

Moreover, in this embodiment, as shown in FIG.2 and FIG.3, it is comprised so that the door unit 40 can be attached to the front opening 13 of the low temperature showcase 1 so that attachment or detachment is possible.
The door unit 40 includes a frame-like frame 41 that can be attached to the front opening 13 of the low-temperature showcase 1, a pair of doors 42 and 42 that are made of transparent plate glass, and the doors 42 can be freely opened and closed. A hinge mechanism 43 to be supported and a stay 44 for connecting the frame 41 and the door 42 are configured.

The frame 41 includes an upper frame 45 disposed along the upper end of the front opening 13, a lower frame 46 disposed along the lower end of the front opening 13, and a pair of frames disposed along the left and right ends of the front opening 13. It is composed of vertical frames 47 and 47.
As shown in FIGS. 2 and 5, the upper frame 45 is attached to the upper end of the front opening 13, that is, the front lower surface of the canopy 23 in this embodiment. As shown in FIGS. 2 and 4, the lower frame 46 is attached to the lower end of the front opening 13, that is, the upper surface at the lower front end of the heat insulating wall 10 in this embodiment. The vertical frame 47 is attached substantially vertically so as to connect both ends of the upper frame 45 and both ends of the lower frame 46.

In this state, the cool air discharge port 30 is disposed inside the display chamber 15 from the upper frame 45, and the room temperature air discharge port 34 is disposed outside the upper frame 45. Similarly, the cold air inlet 31 is disposed on the inner side of the display chamber 15 from the lower frame 46, and the room temperature air inlet 35 is disposed on the outer side of the lower frame 46.
That is, a cold air curtain is formed by the cold air discharge port 30 and the cold air suction port 31 on the display chamber 15 side of the door unit 40, and the room temperature air discharge port 34 and the room temperature air suction are formed outside the door unit 40. An air curtain of normal temperature air is formed by the mouth 35.

The door 42 is attached to the upper frame 45 and the lower frame 46 by a hinge mechanism 43 that rotatably supports the door 42. The door 42 is configured by a substantially rectangular glass plate when viewed from the front.
In the present embodiment, each door 42 has hinge mechanisms 43 attached to upper and lower edges at both sides of the front opening 13 and upper and lower edges at the center of the front opening 13, respectively. The pair of doors 42 on the left and right sides of the display chamber 15 are double doors 42 that open on both sides.
A handle 48 is attached to the central portion of the door 42.
In addition, you may make it comprise the door 42 by the sliding door type door 42 in which each door 42 slides to right and left. In addition to the transparent glass plate, other materials such as an acrylic plate can be used as the door 42.

The hinge mechanism 43 has a substantially U-shaped cross section, and includes a door holding member 50 that supports the door 42 with the upper and lower ends sandwiched therebetween. The door holding member 50 includes a base portion 51 and a support portion 52 that extends from both sides of the base portion 51 so as to face each other and supports both sides of the upper end edge or the lower end edge of the door 42. Yes. A support shaft 53 that is engaged with a support hole (not shown) formed in the upper frame 45 and the lower frame 46 is integrally provided on the base 51 of the door holding member 50.
Then, the door 42 is supported by the support portion 52 and is rotatable about the support shaft 53, whereby the door 42 can be opened and closed.

FIG. 6 is a perspective view when viewed from above with the door 42 opened. As shown in FIG. 6, a stay 44 is connected between the lower surface of the upper frame 45 and the upper surface of the door holding member 50.
The stay 44 has a long stay frame 60 with one end connected to the upper frame 45 and a hollow inside, and one end connected to the door holding member 50, and the other end slid inside the stay frame 60. It is comprised from the elongate stay movable member 61 inserted freely.
A stopper mechanism 62 is attached to the insertion end of the stay movable member 61 of the stay frame 60 from above the stay frame 60. The stopper mechanism 62 includes a stopper (not shown) that is spring-biased toward the inside of the stay frame 60.

A slide groove 63 that extends in the length direction of the stay movable member 61 and engages with a stopper is formed at the center in the width direction of the stay movable member 61.
Further, on the extension of the sliding groove 63 of the stay movable member 61 in the longitudinal direction, a stopper holding portion (not shown) with which the stopper is engaged is formed. In this embodiment, for example, the stopper holding portion is engaged with the stopper when the door 42 is opened at an angle of 75 degrees and the stopper 42 is engaged when the door 42 is opened at an angle of 90 degrees. Each is formed at a position.

With this configuration, when the door 42 is opened from the closed state, the stay movable member 61 is located inside the stay frame 60 while the stopper is engaged with the sliding groove 63 of the stay movable member 61. Since it is slidable, the door 42 can be opened without resistance until the stopper reaches the end of the sliding groove 63.
When the door is further opened while the stopper has moved to the end of the sliding groove 63, the stopper gets over the sliding groove 63 and engages with the stopper holding portion. In this state, the door 42 is held in an open state at 75 degrees. When the door 42 is further opened, the stopper gets over the stopper holding portion and engages with the adjacent stopper holding portion. In this state, the door 42 is held in an open state at 90 degrees.

  In this embodiment, the stopper holding portion is provided at a position where the door 42 is held open at 75 degrees and 90 degrees. However, the position and number of the stopper holding portions may be set as necessary. Can be set arbitrarily.

In addition, a connection release mechanism 64 is provided at the tip of the stay movable member 61 to release the connection when a predetermined pressure or more is applied. The connection release mechanism 64 includes a stay connection member 65 that is attached to the door holding member 50 and has a hollow inside. The stay connection member 65 is connected to the upper surface of the door holding member 50 via a pin 66 that penetrates the connection member. Is fixed.
A pair of connecting pieces 67 that are bifurcated so as to be positioned on both sides of the pin 66 are formed at the distal end of the stay movable member 61. Claws 68 projecting inward are formed.

In the normal state, the stay connecting member 65 and the stay movable member 61 are held in a state of being connected to each other by being engaged with the pin 66 by the claw 68 of the connecting piece 67.
Then, when a force is further applied in the opening direction from the state in which the door 42 is opened at an angle of 90 degrees, the engagement between the tab 68 of the connecting piece 67 and the pin 66 is released, thereby the stay movable member. The connection between 61 and the stay connecting member 65 is released.

Next, the operation of this embodiment will be described.
First, the operation when the low-temperature showcase 1 shown in FIG. 1 is used as an open showcase will be described.
In this case, by driving the cool air blower 33, the air inside the cool air duct 18 is cooled by the evaporator 32, and the cooled cool air rises up the cool air duct 18, and the cool air discharge port 30. Is discharged toward the lower side of the front opening 13.
Then, the cold air discharged from the cold air discharge port 30 is sucked from the cold air suction port 31 and returned to the cold air duct 18. As a result, an air curtain made of cold air is formed in the front opening 13, and a part of the cold air curtain is circulated inside the display chamber 15.

On the other hand, by driving the room temperature air blower 36, the air inside the room temperature air duct 19 rises up the room temperature air duct 19 and is discharged from the room temperature air discharge port 34 to below the front opening 13. The
The room temperature air discharged from the room temperature air discharge port 34 is sucked from the room temperature air suction port 35 and returned to the room temperature air duct 19. As a result, an air curtain made of room temperature air is formed on the front side of the cold air curtain in the front opening 13, and a double air curtain of the cold air curtain and the room temperature air curtain is formed.
By forming the double air curtain in this way, the inside and outside of the display chamber 15 can be shut off at the front opening 13 of the open showcase, and the internal temperature of the display chamber 15 can be kept constant. Is possible.

Next, as shown in FIG. 2, the case where the door unit 40 is attached to the front opening 13 of the low temperature showcase 1 will be described.
In this case, since the front opening 13 is covered with the door unit 40, the inside and outside of the display chamber 15 can be completely blocked, and the temperature inside the display chamber 15 is kept constant. And cooling efficiency can be increased.
In this case, in the present embodiment, the cold air discharge port 30 is disposed inside the display chamber 15 of the door unit 40, and the room temperature air discharge port 34 is disposed outside the door unit 40. Similarly, a cold air inlet 31 is arranged on the display chamber 15 side of the door unit 40, and a room temperature air inlet 35 is arranged outside the door unit 40.
Therefore, a cold air curtain is formed by the cold air discharge port 30 and the cold air suction port 31 on the inner side of the display chamber 15 of the door unit 40, and the normal temperature air discharge port 34 and the normal temperature are formed outside the door unit 40. An air curtain made of room temperature air is formed by the air suction port 35.

In general, when the door 42 is installed, a cold air curtain is formed in the display chamber 15 as described above, and the inner surface of the door 42 is always exposed to the cold air. And it is the structure which draws in cold air from the cold air suction inlet 31, and since cold air tends to accumulate below, it exists in the tendency for the inner lower side of the door 42 to cool most easily.
Therefore, in the state as it is, the lower side of the outer surface of the door 42 is at a lower temperature than the outside air, so that the dew condensation is likely to occur.

  However, in the present embodiment, an air curtain of normal temperature air can be reliably formed outside the door unit 40, so that normal temperature air can always be applied to the outer surface of the door 42, and the door 42 Condensation on the outer surface can be reliably prevented.

  In the present embodiment, since the room temperature air duct 19 is disposed on the back side of the cold air duct 18, a heat insulation layer of room temperature air is formed between the heat insulation wall 10 and the cold air duct 18. Will be. Therefore, cooling by cool air can be reduced on the back side of the showcase, and condensation on the back side of the showcase can be prevented.

  In the present embodiment, the example in which the room temperature air duct 19 is disposed on the back side of the cold air duct 18 has been described, but the present invention is not limited thereto. For example, the room temperature air duct 19 may be disposed on the back side and both sides of the cold air duct 18. In this case, since a heat insulating layer is formed by room temperature air between the back side and both sides of the heat insulating wall 10, the dew condensation on the back side and both sides of the low temperature showcase 1 is prevented. be able to.

As described above, in the present embodiment, the door unit 40 is detachably provided in the front opening 13, and when the door unit 40 is not attached, the cool air cooled by the evaporator 32 is discharged from the cool air discharge port 30. Then, a cold air curtain is formed in the front opening 13 by sucking in from the cold air inlet 31, and room temperature air is discharged from the room temperature air outlet 34 and sucked in from the room temperature air inlet 35. Therefore, the low temperature showcase 1 can be used as an open showcase. By forming a double air curtain in this way, the front surface of the low temperature showcase 1 can be used. In the opening 13, the inside and the outside of the display chamber 15 can be shut off, and the internal temperature of the display chamber 15 can be kept constant. The ability.
Further, when the door unit 40 is attached, the front opening 13 is configured to be covered by the door unit 40, so that the inside and the outside of the display chamber 15 can be completely blocked. The temperature can be kept constant, and the cooling efficiency can be increased.
Further, in the present embodiment, a cold air curtain is formed by the cold air discharge port 30 and the cold air suction port 31 on the inner side of the display chamber 15 of the door unit 40, and the room temperature air discharge port 34 is formed outside the door unit 40. In addition, since an air curtain made of room temperature air is formed by the room temperature air suction port 35, an air curtain of room temperature air can be reliably formed outside the door unit 40, and room temperature air is always applied to the outer surface of the door 42. Thus, condensation on the outer surface of the door 42 can be reliably prevented.

  In the present embodiment, since the room temperature air duct 19 is disposed on the back side of the cold air duct 18, a heat insulation layer of room temperature air is formed between the heat insulation wall 10 and the cold air duct 18. Thereby, dew condensation on the back side of the low temperature showcase 1 can be prevented.

In the above-described embodiment, the cool air duct 18 and the room temperature air duct 19 are formed by completely separated flow paths, but the present invention is not limited to this.
For example, the cool air duct 18 and the normal temperature air duct 19 are merged inside the cool air suction port 31 and the normal temperature air suction port 35 and separated from the upstream side of the cool air from the evaporator 32 of the cool air duct 18. It may be formed by a road. In this case, the cold air sucked from the cold air suction port 31 and the normal temperature air sucked from the normal temperature air suction port 35 are mixed, but the cold air and the normal temperature air are mixed to dehumidify the normal temperature air. As a result, the room temperature air dehumidified from the room temperature air discharge port 34 can be discharged.

  The present invention is not limited to the one described in the above embodiment, and various changes and applications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Low-temperature showcase 10 Heat insulation wall 11 Side plate 12 Inner panel 13 Front opening 14 Bottom plate 15 Display room 16 Duct 17 Partition plate 18 Duct for cold air 19 Duct for normal temperature air 21 Shelf plate 30 Cold air discharge port 31 Cold air inlet port 32 Evaporator 33 Cold air Blower 34 Room temperature air outlet 35 Room temperature air inlet 36 Room temperature air fan 40 Door unit 41 Frame 42 Door 43 Hinge mechanism 44 Stay 45 Upper frame 46 Lower frame 47 Vertical frame 50 Door holding member 64 Connection release mechanism

Claims (5)

A heat insulating wall having a substantially U-shaped cross section and a side plate attached to a side surface of the heat insulating wall, and partitioning the heat insulating wall with an inner panel, thereby forming a duct and a display chamber having a front opening. In a low temperature showcase
A partition plate for partitioning the inside of the duct into two flow paths is provided inside the duct, and one of the flow paths is a cold air duct having an evaporator disposed therein, and the other flow path is a room temperature air duct. age,
A cold air outlet provided at the upper front end of the front opening and communicating with the cold air duct, a cold air inlet provided at the lower front end of the front opening and communicating with the cold air duct, and the cold air outlet of the front opening A room temperature air outlet that is provided further forward and communicates with the room temperature air duct; and a room temperature air inlet that is disposed in front of the cold air inlet of the front opening and communicates with the room temperature air duct;
A door unit is detachably provided in the front opening,
In a state where the door unit is not mounted, a cool air cooled by the evaporator is discharged from the cold air discharge port and sucked from the cold air intake port to form a cold air curtain in the front opening, and the room temperature air It is possible to form an air curtain of normal temperature air on the front side of the cold air curtain by discharging normal temperature air from the discharge port and sucking from the normal temperature air suction port,
In a state where the door unit is mounted on the front opening, the cold air outlet and the cold air inlet are arranged on the display room side of the door unit, and the room temperature air outlet and the room temperature air inlet are the door. A low-temperature showcase that is placed outside the unit.   The low-temperature showcase according to claim 1, wherein the cold air duct and the room temperature air duct are provided with completely separated flow paths.   The cold air duct and the room temperature air duct are joined together inside the cold air inlet and the room temperature air inlet, and a flow path separated from the upstream side of the cold air from the evaporator of the cold air duct. The low-temperature showcase according to claim 1, further comprising:   The low-temperature showcase according to any one of claims 1 to 3, wherein the room temperature air duct is disposed at least on a back side of the cold air duct.   The low-temperature showcase according to any one of claims 1 to 4, wherein the door unit includes a pair of doors supported by a frame, and each door is a double-open door. .

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