JPH10232083A - Low temperature showcase - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low temperature showcase in which an upper cooler in upper showcase can assist a lower cooler in lower showcase. SOLUTION: This low temperature showcase has an upper drain pipe 76 which discharges drain water from an upper cooling case section 1 to a lower case section 2. The drain water inlet 76a of the upper drain pipe 76 is located in the high pressure space of a chill channel 14 for upper showcase and the drain water outlet 76b is located in the low pressure space of a chill channel 46 for lower showcase. Because of the pressure difference, chill air in the chill channel 14 for upper showcase flows through the upper drain pipe 76 into the chill channel 46 for lower showcase.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-temperature showcase in which two display rooms, an upper display room and a lower display room, are arranged.

[0002]

2. Description of the Related Art An upper cooler for arranging an upper display room and a lower display room in a low-temperature showcase to cool the upper display room;
Providing a lower cooler for cooling the lower display room is being considered.

[0003]

The load on the cooler differs depending on, for example, the temperature of the outside air, the frequency of taking in and out of products, and the type of display room. In some cases, the load on the upper cooler is small and the load on the lower cooler is large. In such a case, the cooling capacity of the upper cooler may be sufficient, but the cooling capacity of the lower cooler may be insufficient. Then, although the cooling capacity of the upper cooler has a margin, the cooling of the lower display room becomes insufficient.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a low-temperature showcase having a simple structure in which an upper cooler of an upper display room can assist a lower cooler of a lower display room. The purpose is to provide.

[0005]

The low-temperature showcase of the present invention comprises an upper cooling case (1) having an upper display room (19) and a cool air passage (14) for the upper display room, and an upper cooling case. And the lower display room (5
1) a lower cooling case section (2) having a lower display room cold air flow path (46); an upper drain pipe (76) for discharging drain water from the upper cooling case section to the lower cooling case section; A machine room (3) arranged below the case,
A lower drain pipe (78) for discharging drain water from the lower cooling case into the machine room.

In the low-temperature showcase according to the first aspect of the present invention, an upper cooler (16) and a blower (17) for the upper cooler are provided in the cool air flow path for the upper display room. A discharge port (14a) for discharging cool air to the upper display chamber is formed at one end of the display room cool air flow path, and a suction port (14b) for sucking air from the upper display chamber is formed at the other end. ing. When the blower for the upper cooler is operated, the cold air flow path for the upper display room includes a high-pressure space (14d) having a higher pressure than the atmosphere and a low-pressure space (1) having a lower pressure than the high-pressure space.
4c). A drain water inlet (76a) of an upper drain pipe is provided in the high pressure space of the upper display room cold air flow path.
Is arranged, while the drain water outlet (7
6b) is disposed in the lower display room or the lower display room cool air flow path at a pressure lower than the pressure of the drain water inlet.

In the low-temperature showcase according to the second aspect of the present invention, a lower cooler (47) and a blower (48) for the lower cooler are provided in the cool air flow path for the lower display room.
A discharge port (46a) for discharging cool air to the lower display chamber is provided at one end of the lower display room cool air passage, and a suction port (46b) for sucking air from the lower display chamber is provided at the other end. Is formed. When the blower for the lower cooler operates, the cool air flow path for the lower display room becomes a high pressure space (4
6d) and a low-pressure space (46) having a lower atmospheric pressure than the high-pressure space.
c). The drain water outlet of the upper drain pipe is arranged in the low pressure space of the lower display room cold air flow path,
On the other hand, the drain water inlet of the upper drain pipe is arranged in the upper display room or the upper display room cold air flow passage which is higher in pressure than the drain water outlet.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a low-temperature showcase according to the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of a low-temperature showcase according to the present invention. FIG. 2 is a perspective view of a low-temperature showcase for explaining the flow of cold air and drain water. FIG. 3 is a longitudinal sectional view of the low-temperature showcase.

[0009] The low-temperature showcase has cooling case sections 1 and 2 at the top and a machine room 3 at the bottom. The cooling case parts 1 and 2 are composed of an upper cooling case part 1 and a lower cooling case part 2 arranged below the upper cooling case part 1, and the upper cooling case part 1 is of a closed type. The case 2 is an open type.

The upper cooling case 1 has a glass plate 6 having a transparent plate at the front of the upper surface, the upper portion of the front surface, and the upper portions of both side surfaces.
The rear part of the upper surface, the lower part of the front surface, and the lower part of both side surfaces are covered with a heat insulating plate 8, and the rear surface is covered with a heat insulating rear wall 9 for the upper cooling case portion. The heat insulating plate 8 and the heat insulating rear wall 9 for the upper cooling case portion
Is made of a heat insulating material made of a foamed synthetic resin, such as hard foamed polyurethane, whose outside is covered with a plate material such as a stainless steel plate or a painted steel plate. A partition 12 made of a stainless steel plate or the like is arranged between the upper cooling case 1 and the lower cooling case 2. Above the partition 12 which is the bottom wall of the upper cooling case 1, a bottom plate 13 is arranged with a space therebetween, and a space between the bottom plate 13 and the partition 12 serves as a cooling chamber 14. A blower cover 15 is provided inside the cooling chamber 14 serving as a cool air flow path for the upper display room. An upper cooler blower 17 is provided at an opening on the front surface of the blower cover 15, and an upper cooler 1 is provided inside the blower cover 15.
6 are arranged. A cool air discharge port 14a is provided on the rear side of the bottom plate 13 which is one end of the cooling chamber 14, while a suction port 1 is provided on a front side of the bottom plate 13 which is the other end of the cooling chamber 14.
4b is formed.

The space surrounded by the glass plate 6, the upper heat insulating plate 8, the upper heat insulating rear wall 9 for the cooling case, and the bottom plate 13 is the upper display room 19. In the upper display room 19, a display shelf 21 is provided detachably. Further, in the heat insulating rear wall 9 for the upper cooling case portion, a product opening 23 for taking out or storing a product in the upper display room 19 is formed,
A pair of left and right glass doors 26, which are rear doors, are slidably provided in the product opening 23, and the product opening 23 is openably and closably closed.

The lower cooling case portion 2 has an upper surface which is a partition wall 12 which is a top wall of the lower cooling case portion 2, a rear surface which is a heat insulating rear wall 31 for the lower cooling case portion, and a lower surface which is a heat insulating partition between the lower cooling case portion 2 and the machine room 3. 32
Both sides are covered with a heat insulating side plate 33 made of a heat insulating material having a glass plate portion, and a product opening 36 for taking out or storing a product is formed on the front surface. The heat insulating rear wall 31 and the heat insulating partition 32 for the lower cooling case portion
Is made of heat insulating material.

The heat-insulating rear wall 31 for the lower cooling case portion is
The upper cooling case section 1 is formed integrally with the upper cooling case section heat insulating rear wall 9 and is located slightly forward of the upper cooling case section heat insulating rear wall 9. A step is formed at the boundary between the heat insulating rear wall 9 for the cooling case portion and the heat insulating rear wall 31 for the lower cooling case portion. The thickness of the heat insulating rear wall 31 for the lower cooling case portion is slightly smaller than the thickness of the heat insulating rear wall 9 for the upper cooling case portion.
Further, the heat insulating side plate 33 is provided in the cooling chamber 14 of the upper cooling case 1.
Is formed integrally with the heat insulating plate 8 constituting the side wall of the first embodiment.

At a suitable distance from the inner surfaces of the partition wall 12, the heat insulating rear wall 31 for the lower cooling case, and the heat insulating partition wall 32, a partition top plate 41 made of a non-rusting metal plate such as a coated steel plate or stainless steel. A wall plate 42 and a partition floor plate 43 are provided. The space between the partition top plate 41, the partition wall plate 42, and the partition floor plate 43, the partition wall 12, the heat insulating rear wall 31 for the lower cooling case portion, and the heat insulating partition wall 32 forms the cool air flow path 4.
It becomes 6. The cool air passage 4 which is the cool air passage for the lower display room
6, a blower cover 45 is provided below the partition floor plate 43, and a blower 48 for a lower cooler is provided at an opening on the front surface of the blower cover 45. Further, a lower cooler 47 is provided behind the partition wall plate 42. Further, both side plates 45 a of the blower cover 45 extend to the lower end of the lower cooler 47.

A cold air discharge port 46a is provided in front of the partition top plate 41, which is one end of the cool air channel 46, and a suction port 46a is provided in front of the partition floor plate 43, which is the other end of the cool air channel 46.
b is formed. Moreover, the heat insulation side plate 33 and the division top plate 4
1. In a lower display room 51 as a storage room surrounded by a partition wall plate 42 and a partition floor plate 43, a product display shelf 52 is provided.

The machine room 3 is provided with a condenser 56, a condenser blower 57, a compressor (not shown), and the like. The condenser 56, the compressor and the above-described upper cooler 16 and lower cooler 47 are Constructs a refrigeration cycle. The machine room 3 is covered with side panels 61 on both sides, a front panel 62 on the front side, and a rear panel 63 on the back side. The front panel 62 has an intake port 62a, and the rear panel 63 has an exhaust port 63a.

The upper end of the rear panel 63 extends above the machine room 3. The extending portion 63b of the rear panel 63 has an interval with the rear surface of the heat insulating rear wall 31 for the lower cooling case portion, and a space is formed between the extending portion 63b and the heat insulating rear wall 31 for the lower cooling case portion. This space is an exhaust duct 66. The upper end of the exhaust duct 66 extends to near the upper end of the heat insulating rear wall 31 for the lower cooling case, and the lateral width of the exhaust duct 66 is substantially the same as the lateral width of the heat insulating rear wall 31 for the lower cooling case. The exhaust duct 66 covers substantially the entire rear surface of the heat insulating rear wall 31 for the lower cooling case. The lower end of the exhaust duct 66 communicates with the rear end of the machine room 3, and an exhaust port 68 is formed at the upper end of the exhaust duct 66. The exhaust port 68 is open upward so that air can be exhausted upward.

Next, the drain water drainage structure will be described. The upper drain pipe 76 for discharging the drain water of the upper cooling case portion 1 to the lower cooling case portion 2 is provided so as to extend one by one on each of the left and right sides in the cool air passage 46 of the lower cooling case portion 2. I have. The drain water inlet 76a, which is one end of the upper drain pipe 76, is located on both sides of the rear end of the partition 12,
That is, they are arranged on both sides on the rear side of the upper cooler 16, while
A drain water outlet 76b at the other end of the upper drain pipe 76
Are disposed on both left and right sides of the heat insulating partition 32, that is, outside the both side surfaces of the blower cover 45 of the lower cooling case portion 2. A gap is formed between the lower end of the side plate 45a of the blower cover 45 and the heat insulating partition 32, and drain water can flow into the blower cover 45 through this gap.

The lower drain pipe 78 is disposed in the machine room 3 and has a drain water inlet 78 at the upper end thereof.
a opens near the center of the heat insulating partition 32, that is, near the center in the blower cover 45. The upper surface of the heat insulating partition 32 is inclined so as to be lower as it approaches the drain water inlet 78a. On the other hand, a drain water outlet (not shown) at the lower end of the lower drain pipe 78 is connected to a drain port or the like, and discharges drain water out of the low-temperature showcase. The lower drain pipe 78 is provided with a cool air outflow prevention means (not shown) such as a U trap.
It is configured such that cool air in the lower cooling case portion 2 does not flow out to the machine room 3 or the like. Note that the upper drain pipe 76 is not provided with a cool air outflow prevention means such as a U trap, and is configured so that cool air can flow through the upper drain pipe 76.

When the refrigeration cycle of the low-temperature showcase constructed as described above operates, the upper cooler 16 and the lower cooler 47 become low in temperature and cool the surrounding air. As shown in FIGS. 2 and 3, in the upper cooling case 1, the upper cooler blower 17 is
The cool air cooled in the above is discharged from the cool air discharge port 14a into the upper display chamber 19, and the air in the upper display chamber 19 is sucked into the cooling chamber 14 from the suction port 14b. In this manner, the upper display room 19 is cooled while forcibly circulating the air.

Further, in the lower cooling case section 2, the blower 48 for the lower cooler discharges the cool air cooled by the lower cooler 47 into the lower display chamber 51 from the cool air discharge port 46a. The cool air discharged into the lower display room 51 flows along the product opening 36 of the lower cooling case portion 2 to form an air curtain 71, and flows into the cool air passage 46 from the suction port 46b. In this way, the lower display room 51 is cooled while forcibly circulating the air.

Then, the upper cooler 16 of the upper cooling case 1
In addition, since frost adheres to the lower cooler 47 of the lower cooling case section 2, defrosting is sometimes performed, and defrost water is generated. Drain water such as defrost water from the upper cooler 16 flows into the upper drain pipe 76 from the drain water inlet 76a, and is discharged from the drain water outlet 76b to both left and right portions of the heat insulating partition 32. The drain water discharged onto the heat insulating partition 32 is, as shown by a double-line arrow in FIG.
5 penetrates into the blower cover 45 through a gap between the side plate 45 a and the heat insulating partition 32. On the other hand, drain water such as defrost water from the lower cooler 47 falls on the heat insulating partition 32 and flows into the blower cover 45. In this way, the drain water such as the defrost water of the upper cooler 16 and the defrost water of the lower cooler 47 flows into the blower cover 45, and then flows from the drain water inlet 78a to the lower drain pipe 78. And discharged out of the low-temperature showcase through the machine room 3.

In the upper cooling case 1, the pressure in the upper display chamber 19 is substantially atmospheric pressure. When the upper-cooler blower 17 operates, the air pressure between the suction port 14b and the upper-cooler blower 17, that is, the air pressure on the upstream side of the upper-cooler blower 17 becomes lower, and the upper-cooler blower 17 and the cool air discharge port 14a , That is, the air pressure downstream of the upper cooler blower 17 becomes higher. In this way, the inside of the cooling chamber 14 includes a low-pressure space 14c formed at a portion near the upstream side and the low pressure, and a high-pressure space 14d formed at a portion near the downstream side and the low pressure. Divided into
Thus, the pressure in the low-pressure space 14c is lower than the pressure in the high-pressure space 14d. Similarly, in the lower cooling case section 2, the air pressure in the lower display chamber 51 is substantially the atmospheric pressure, and when the blower 48 for the lower cooler operates, the suction port 46 b
The air pressure between the blower 48 and the lower cooler, that is, the air pressure upstream of the blower 48 for the lower cooler becomes lower, and the air pressure between the blower 48 for the lower cooler and the cool air discharge port 46a, that is, the air pressure downstream of the blower 48 for the lower cooler Will be higher. The inside of the cool air passage 46 is divided into a low-pressure space 46c having a low air pressure formed at a portion near the upstream side and the upstream side, and a high-pressure space 46d having a high pressure formed at a portion near the downstream side and the downstream side. . Thus, the pressure in the low pressure space 46c is lower than the pressure in the high pressure space 46d.

A drain water inlet 76a of the upper drain pipe 76
Is disposed in the high-pressure space 14d of the cooling chamber 14, while the drain water outlet 76b of the upper drain pipe 76 is
6 is disposed in the low-pressure space 46c. As described above, since the pressure difference is generated between the drain water inlet 76a and the drain water outlet 76b, the cool air in the cooling chamber 14 of the upper cooling case unit 1 passes through the upper drain pipe 76 and the lower cooling case unit. The cold air is supplied to the second cold air passage 46. The cool air supplied to the cool air passage 46 flows forward along the side plate 45a of the blower cover 45 as shown by a single-line arrow in FIG. 2, and is then sucked into the blower 48 for the lower cooler. I have. Then, the air merges with the air sucked from the suction port 46b of the cool air flow path 46, flows through the cool air flow path 46, and is discharged from the cool air discharge port 46a into the lower display chamber 51.

Incidentally, the drain water inlet 78a of the lower drain pipe 78 is disposed in the high pressure space 46d of the cool air flow passage 46. The lower drain pipe 78 is provided with a cool air outflow preventing means such as a U trap. There is no air flow. Therefore, it is possible to prevent the cool air in the lower cooling case section 2 from flowing out of the low-temperature showcase through the lower drain pipe 78.

In the machine room 3, when the condenser blower 57 operates, outside air is sucked in from the intake port 62 a of the front panel 62, and the condenser 56 is air-cooled.
The part of the air warmed by the
, And the remaining warm air is exhausted upward from the exhaust port 68 via the exhaust duct 66. The warm air exhausted from the exhaust port 68 flows upward along the rear surface of the glass door 26. The flow of the warm air heats the glass door 26 to prevent condensation on the glass door 26 of the upper cooling case 1.

The exhaust port 63a of the rear panel 63 is openable and closable. When the glass door 26 has a large amount of dew condensation, for example, when the outside air is warm and humid,
The exhaust port 63a of the rear panel 63 is closed and the exhaust duct 6 is closed.
6, the amount of exhaust from the exhaust port 68 is increased. on the other hand,
When the dew condensation on the glass door 26 is small, for example, when the outside air is low temperature and dry,
3a is opened to reduce the amount of exhaust air from the exhaust port 68 of the exhaust duct 66. In this way, by configuring the exhaust port 63a to be freely opened and closed, it is possible to prevent the glass door 26 from being heated more than necessary.

In such a low-temperature showcase, the temperature of the upper display room 19 and the temperature of the lower display room 51 are set to substantially the same value. Is displayed. Then, in response to the purchaser's order, the clerk opens the glass door 26 and takes out the product. On the other hand, in the lower display room 51, pudding, sandwiches, and the like contained in the container are displayed, and a purchaser or the like can freely take out from the product opening 36.

The upper cooling case 1 is of a closed type, and the flow of the cool air is small, so that the cooling capacity of the upper cooler 16 has a margin. On the other hand, the lower cooling case section 2 is an open type, and the flow of the cool air from the commodity opening 36 is larger than that of the upper cooling case section 1, and the lower cooling unit 47 is provided.
, A load greater than that of the upper cooler 16 is applied, and the cooling capacity may not be sufficient. However, in this embodiment, the cool air of the upper cooling case 1 is supplied to the lower cooling case 2 using the upper drain pipe 76. Therefore, the upper cooler 16 can assist the cooling of the lower display room 51 of the lower cooling case portion 2.

As described above, in the embodiment, the drain water inlet 76 a, which is one end of the upper drain pipe 76, is connected to the high-pressure space 14 d of the cooling chamber 14 of the upper cooling case 1 while the upper drain pipe 76 The drain water outlet 76b at the other end is
Since the cooling air is disposed in the low-pressure space 46c of the cool air passage 46 of the lower cooling case section 2, the cool air in the cooling chamber 14 can be smoothly supplied to the cool air passage 46. The cool air flows in the same direction as the drain water, and the drain water can be drained more smoothly.

The embodiment of the present invention has been described above in detail.
The present invention is not limited to the above embodiment,
Within the gist of the present invention described in the claims,
Various changes can be made. Modification examples of the present invention are exemplified below. (1) In the embodiment, the upper cooling case 1 is a closed type and the lower cooling case 2 is an open type.
The lower cooling case 2 may be of a closed type. In addition, low-temperature showcase, even in refrigerated,
Freezing is also possible. Furthermore, the products to be displayed are not limited to cakes, puddings, sandwiches, and the like, and other products can be displayed as appropriate.

(2) In the embodiment, the temperature of the upper display room 19 and the temperature of the lower display room 51 are set to substantially the same value, but may be different values. When the temperature of the upper display room 19 is set lower than the temperature of the lower display room 51, the upper cooler 16 can efficiently assist the cooling of the lower display room 51. (3) In the embodiment, one condenser 56 constitutes a refrigeration cycle with two condensers of the upper condenser 16 and the lower condenser 47, but two condensers 56 are provided, and one condenser 56 is provided. Constitutes a refrigeration cycle with the upper cooler 16,
It is also possible for the other condenser 56 to form a refrigeration cycle with the lower cooler 47.

(4) In the embodiment, the drain water inlet 76a of the upper drain pipe 76 is connected to the high-pressure space 14d of the cooling chamber 14, which is a cold air flow path for the upper display room, while the drain water outlet of the upper drain pipe 76 is provided. 76b is disposed in the low-pressure space 46c of the cool air flow passage 46 of the lower display room cool air flow passage, but the air pressure at the drain water inlet 76a of the upper drain pipe 76 is higher than the air pressure at the drain water outlet 76b. If it is, the drain water inlet 76a and the drain water outlet 76b
Can be arranged at an appropriate place in the display room or the cool air flow path. (5) The structure and arrangement of the cool air flow path, the cooler, the blower for the cooler, and the like can be appropriately changed.

[0034]

In the low-temperature showcase of the present invention, the drain water in the upper cooling case section flows into the lower cooling case section through the upper drain pipe, and merges with the drain water in the lower cooling case section to form the lower drain pipe. Through the machine room. As described above, the lower drain pipe is also used for drainage of drain water in the upper cooling case section and the lower cooling case section. Therefore, the drain pipe for draining the drain water in the upper cooling case section into the machine room and the drain pipe for draining the drain water in the lower cooling case section into the machine room are provided separately. The amount of piping is reduced, and the number of parts and cost can be reduced.

In the low-temperature showcase thus configured, according to the first aspect of the present invention, the drain water inlet of the upper drain pipe is disposed in the high-pressure space of the cold air flow path for the upper display room. The drain water outlet is arranged in the lower display room or the lower display room cool air flow path which is lower in pressure than the pressure of the drain water inlet. Then, due to the pressure of the high-pressure space, the cool air in the upper display room cool air flow path flows into the lower display room or lower display room cool air flow path through the upper drain pipe. As a result, the upper drain pipe is effectively used without separately providing a cool air duct, etc.
A cooler in the upper cooling case section can assist cooling in the lower cooling case section.

Further, in the invention described in claim 2 of the present application,
The drain water outlet of the upper drain pipe is arranged in the low-pressure space of the cold air flow path for the lower display room, while the drain water inlet is for the upper display room or the upper display room where the pressure is higher than the pressure of the drain water outlet. It is arranged in a cool air passage. Then, due to the suction force of the low-pressure space, the cool air in the upper display room or the cool air flow passage for the upper display room flows into the cool air flow passage for the lower display room through the upper drain pipe. As a result,
The cooler in the upper cooling case can assist the cooling in the lower cooling case by effectively utilizing the upper drain pipe without providing a cool air duct or the like.

[Brief description of the drawings]

FIG. 1 is a perspective view of a low-temperature showcase according to the present invention.

FIG. 2 is a perspective view of a low-temperature showcase for explaining the flow of cool air and drain water.

FIG. 3 is a longitudinal sectional view of a low-temperature showcase.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper cooling case part 2 Lower cooling case part 3 Machine room 14 Cooling room (Cool air flow path for upper display room) 14a Cold air discharge port 14b Suction port 14c Low pressure space 14d High pressure space 16 Upper cooler 17 Upper blower blower 19 Upper display Room 46 Cold air flow path (cool air flow path for lower display room) 46a Cold air discharge port 46b Suction port 46c Low-pressure space 46d High-pressure space 47 Lower cooler 48 Blower for lower cooler 51 Lower display room 76 Upper drain pipe 76a Drain water inlet 76b Drain Water outlet 78 Lower drain pipe

Continuation of front page (72) Inventor Harunobu Iguchi 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (2)

[Claims] An upper cooling case section having an upper display room and an upper display room cool air flow path; an upper cooler and an upper cooler blower provided in the upper display room cool air flow path; A discharge port formed at one end of the upper display room cool air flow passage for discharging cool air to the upper display room; and a discharge opening formed at the other end of the upper display room cool air flow passage to suck air in the upper display room. A suction port, which is arranged below the upper cooling case portion,
A lower cooling case section having a lower display room and a lower display room cool air flow path; an upper drain pipe for discharging drain water of the upper cooling case section to the lower cooling case section; and a lower cooling case section disposed below the lower cooling case section. A lower drain pipe for discharging drain water from a lower cooling case section to the machine room, and the upper display room cold air flow path has a pressure higher than the atmospheric pressure due to the operation of the upper cooler blower. A high-pressure space and a low-pressure space having a lower pressure than the high-pressure space; a drain water inlet of the upper drain pipe is arranged in a high-pressure space of a cold air flow path for an upper display room; and a drain water outlet of the upper drain pipe. A low-temperature showcase, wherein the low-temperature showcase is disposed in a lower display room or a lower-display-room cool air flow path at a pressure lower than the pressure of the drain water inlet. 2. An upper cooling case portion including an upper display room and an upper display room cool air flow path, wherein the upper cooling case portion is disposed below the upper cooling case portion.
A lower cooling case portion including a lower display room and a lower display room cool air flow path; a lower cooler and a blower for the lower cooler disposed in the lower display room cool air flow path; A discharge port formed at one end of the cool air flow path to discharge cool air to the lower display chamber; and a suction port formed at the other end of the lower display room cool air flow path to suck air from the lower display chamber. An upper drain pipe for discharging the drain water of the cooling case to the lower cooling case, a machine room located below the lower cooling case, and a lower drain for discharging the drain water of the lower cooling case to the machine room The lower display room cold air flow path is divided into a high-pressure space having a higher pressure than the atmosphere and a low-pressure space having a lower pressure than the high-pressure space by operating the blower for the lower cooler. The drain water outlet of the pipe is The drain water inlet of the upper drain pipe is disposed in a low-pressure space of the room cool air flow path, and the drain water inlet of the upper drain pipe is disposed in the upper display room or the upper display room cool air flow path having a pressure higher than the pressure of the drain water outlet. A low-temperature showcase characterized by the following.