JPH08159638A - Low temperature show case - Google Patents

Abstract

PURPOSE: To provide a low temperature show case in which some disadvantages generated by a dew condensation at an outer layer duct can be eliminated. CONSTITUTION: A low temperature show case 1 is constructed such that a cooling device E is installed at an inner layer duct 11 divided by and formed together with a storing chamber, and further an outer layer duct 12 is defined and formed at a side of the inner layer duct 11 together with a partition plate 14 and a pipe plate of the cooling device E and then air curtains of inner and outer double layers are formed at an opening of the storing chamber. The partition plate 14 is arranged inside the pipe plate C of the cooling device E.

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 layers of inner and outer air curtains are formed in an opening of a storage room.

[0002]

2. Description of the Related Art Conventionally, a low temperature showcase of this type has been disclosed in, for example, Japanese Patent Publication No. 3-56396 (F25D17 / 0).
As shown in 8), an outer layer duct and an inner layer duct are formed inside the heat insulating wall having a substantially U-shaped cross section, and a cooler is installed in the inner layer duct, whereby a front surface of the storage chamber is formed. Cool air curtain inside the opening,
On the outside thereof, an inner and outer two-layer air curtain is formed which is composed of an air curtain for protecting the cold air curtain.

However, when the inner layer duct and the outer layer duct are partitioned and formed in the front-rear direction in the back of the storage chamber as in the above publication, the front-rear dimension of the entire low temperature showcase is enlarged,
Alternatively, there is a problem that the volume of the storage chamber is reduced accordingly.

Therefore, in recent years, as shown in FIGS. 9 and 10, for example, the outer layer duct 102 is provided on the side of the inner layer duct 101.
A low-temperature showcase 100 having compartments formed therein has been developed. The conventional structure will be described with reference to the drawings. The back of the low temperature showcase 100 is divided into front and rear by a partition plate 103, and the front side of the partition plate 103 is a storage chamber (not shown). The inner layer duct 101 and the outer layer ducts 102 located on the left and right sides of the inner layer duct 101 are formed on the rear side of the partition plate 103.

A cooler E, which constitutes a cooling device, is installed in the inner lower portion of the inner layer duct 101. The cooler E is a so-called plate fin type heat exchanger, and includes tube plates C and C at the left and right ends, a plurality of heat exchange fins F disposed between the tube plates C and C, and And a refrigerant pipe P held by the tube plates C, C and penetrating the heat exchange fins F.
The left and right bend parts B of the refrigerant pipe P make U-turns outside the tube plates C, C.

A partition plate 104 is continuously attached to the inner ends of the upper surfaces of the tube plates C and C of the cooler E, and the inner layer duct 101 is formed by these tube plates C and C and the partition plate 104.
The outer layer duct 102 is divided into left and right. Further, due to such a structure, the tube plates C of the cooler E, and the bend portion B of the refrigerant pipe P are located inside the outer layer duct 102 below the partition plate 104. In the upper part of the storage room, the outer layer duct 102 and the inner layer duct 101 are vertically divided by a partition plate of a ceiling part (not shown),
Each of them communicates with the inner and outer layer discharge ports described below.

On the other hand, a fan casing 107 is disposed in the bottom duct 106 below the bottom plate (not shown) of the storage chamber, and the grill 1 of the fan casing 107 is disposed.
08 is a blower 1 consisting of a suction type propeller fan
09 is attached. Although the lower ends of the inner layer duct 101 and the outer layer ducts 102, 102 are partitioned from the bottom duct 106, they communicate with the inside of the fan casing 107 and are sucked from the bottom duct 106 when the blower 109 is operated. Air is blown toward the inner layer duct 101 as indicated by the solid line arrow in the figure, and toward the left and right outer layer ducts 102, 102 as indicated by the dashed line arrow in the figure.

The air blown to the inner layer duct 101 passes between the heat exchange fins F of the cooler E and the refrigerant pipes P from the bottom to the top and is heat-exchanged with these to be cooled. The liquid rises inside and is discharged toward the opening from an inner layer discharge port (not shown) formed at the upper edge of the front opening of the storage chamber. On the other hand, the air blown to the outer layer duct 102 rises as it is and is discharged toward the opening from the outer layer discharge port formed on the outer side (front side) of the inner layer discharge port. Cold air or the like discharged from each discharge port is supplied from the suction port (not shown) formed at the lower edge of the opening to the bottom duct 106.
Return to inside.

As a result, an inner and outer two-layer air curtain consisting of an inner cool air curtain and an outer protective air curtain is formed at the front opening of the storage chamber, and a part of the inner cool air curtain is formed. It was circulated in the storage chamber and cooled there to a predetermined temperature.

[0010]

However, low-temperature cold air is circulated in the inner layer duct 101, and the air circulated in the outer layer duct 102 is cooled by the cool air flowing in the inner layer duct 101. On the other hand, outer layer duct 1
Since 02 also contains a large amount of outside air that is sucked from the suction port and has a large amount of humidity, the moisture inside the outer layer duct 102 is not formed on the outer surface of the partition plate 104 or the outer surface (upper surface) of the partition plate of the ceiling. Condensation forms and condenses.

This condensed water is divided into partition plates 104 as shown in FIG.
The water flows down along the surface of the outer layer duct 102 side, reaches the upper surface of the tube plate C of the cooler E, and is further dropped in the bend portion B of the refrigerant pipe P to be cooled, and icing occurs there.
When such freezing grows, the flow of air in the outer layer duct 102 is hindered, and the defrosting time of the cooler E is extended or frost residue occurs, which causes a problem.

The present invention has been made to solve the above-mentioned conventional technical problems, and an object thereof is to provide a low-temperature showcase capable of eliminating the disadvantage caused by the dew condensation on the outer layer duct. To do.

[0013]

That is, according to the low temperature showcase of the invention of claim 1, the cooler is installed in the inner layer duct that is partitioned from the storage chamber, and at the side of the inner layer duct,
An outer layer duct is defined by a partition plate and a tube plate of a cooler, and an air curtain of two layers inside and outside is formed at the opening of the storage chamber.The partition plate is placed inside the tube plate of the cooler. It is arranged.

In the low temperature showcase of the invention of claim 2, the cooler is installed in the inner layer duct which is partitioned from the storage chamber, and the outer layer is provided on the side of the inner layer duct by the partition plate and the tube plate of the cooler. A duct is divided into compartments, and an air curtain of two layers inside and outside is formed in the opening of the storage room, and a gutter plate protruding above the tube plate of the cooler is provided on the outer surface of the partition plate. Is.

A low temperature showcase according to a third aspect of the present invention is characterized in that the gutter plate is provided at a position beyond the rectifying region of the air flowing in the outer layer duct.

In the low temperature showcase of the invention of claim 4, the cooler is installed in the inner layer duct which is partitioned from the storage chamber, and the outer layer is provided on the side of the inner layer duct by the partition plate and the tube plate of the cooler. A duct is divided and formed, and an air curtain of two layers inside and outside is formed in the opening of the storage chamber, and a gutter plate oriented in a direction away from the partition plate is formed on the inner bottom surface of the outer layer duct above the storage chamber. It is a projecting piece.

[0017]

According to the low temperature showcase of the invention of claim 1,
A partition plate for partitioning and forming the outer layer duct on the side of the inner layer duct together with the tube plate of the cooler installed in the inner layer duct,
Since it is arranged inside the tube sheet, a part of the dry, low-temperature cold air that exchanges heat with the cooler and flows into the inner layer duct flows into the outer layer duct outside the partition plate. Therefore,
The temperature difference between the outer layer duct moisture and the inner and outer layer ducts is reduced,
Since the dew condensation on the outer surface of the partition plate is eliminated or suppressed, the inconvenience caused by the freezing of the portion of the cooler on the outer layer duct side is eliminated or reduced.

According to the low temperature showcase of the invention of claim 2, the tube sheet is provided on the outer surface of the partition plate for partitioning and forming the outer layer duct on the side of the inner layer duct together with the tube sheet of the cooler installed in the inner layer duct. Since the gutter plate is provided in the upper position, the dew condensation formed on the outer surface of the partition plate can be prevented before dripping to the outer layer duct side portion of the cooler. Therefore, the inconvenience due to the freezing of the portion of the cooler on the outer layer duct side is eliminated.

Further, according to the low temperature showcase of the invention of claim 3, in addition to the above, since the gutter plate is provided at a position beyond the rectification area of the air flowing in the outer layer duct, the gutter protruding from the partition plate. It is possible to suppress the inconvenience that the rectifying region of the air in the outer layer duct is disturbed by the plate, and it is possible to reduce the adverse effect of the gutter plate on the air flow in the outer layer duct.

According to the low temperature showcase of the fourth aspect of the present invention, since the gutter plate oriented in the direction away from the partition plate is provided on the inner bottom surface of the outer layer duct above the storage chamber, the inside of the outer layer duct above the storage chamber is provided. It is possible to prevent the dew condensation water generated on the bottom surface from flowing to the partition plate and traveling along it to drip on the outer layer duct side portion of the cooler. Therefore, the inconvenience caused by the freezing of the outer duct side portion of the cooler is eliminated. Further, since the gutter plate is provided so as to project from a position far from the cooler, it is possible to minimize the inconvenience that the flow of air in the outer layer duct is disturbed by the gutter plate.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a vertical side view of a low temperature showcase 1 of the present invention,
2 is a perspective view illustrating the duct structure of the low temperature showcase 1, FIG. 3 is an enlarged perspective view of the side of the cooler E, and FIG. 4 is a plan sectional view of the lower portion of the low temperature showcase 1. In each drawing, the same reference numerals as those in FIGS. 9 and 10 are the same.

The low temperature showcase 1 is composed of a heat insulating wall 2 having a substantially U-shaped cross section, and side plates (not shown) attached to both sides of the heat insulating wall 2, inside the back wall 2A and the top wall 2B of the heat insulating wall 2. The partition plates 3 are attached at intervals.
Further, a bottom plate 4 is attached to the lower end front side of the partition plate 3 with a space from the bottom wall 2C of the heat insulating wall 2, and a storage having an opening 8 on the front surface inside the partition plate 3 and the bottom plate 4 is enclosed. The chamber 6 is configured. A plurality of shelves 7 for displaying products are installed in the storage room 6.

An inner layer duct 11 is provided on the rear side of the partition plate 3.
And the outer layer ducts 12 located on the left and right sides thereof are partitioned and formed. And the inner layer duct 1 located behind the storage room 6
A cooler E that constitutes a cooling device is installed in the lower part of the inside of 1. This cooler E is a so-called plate fin type heat exchanger as described above, and includes tube plates C at the left and right ends, and a plurality of heat exchange fins F between the tube plates C, C. When,
A refrigerant pipe P held by the tube plates C, C and penetrating the heat exchange fins F, ..., The left and right bend parts B of the refrigerant pipe P are U-turned outside the tube plates C, C. .

Partition plates 14, 14 are continuously attached to the upper ends of the heat exchange fins (outermost heat exchange fins) F1, F1 inside the tube plates C, C of the cooler E, and these tube plates are attached. The inner layer duct 11 and the outer layer duct 12 behind the storage chamber 6 are divided into left and right by C and C and the partition plates 14 and 14. With such a structure, the tube plates C and C of the cooler E and the bend portion B of the refrigerant pipe P are located inside the outer layer duct 12 below the partition plate 14, and between the tube plate C and the heat exchange fin F1. The upper end of the gap G communicates with the outer layer duct 12.

On the other hand, above the ceiling 3A of the partition plate 3,
A partition plate 16 on the ceiling is attached to the ceiling 3A and the ceiling wall 2B of the heat insulating wall 2 with a space therebetween at a gradually lower angle toward the rear. Both sides of the rear end of the partition plate 16 border the upper end openings 12A of the outer layer ducts 12, 12 on the back side, and the other portions close the upper part of the inner layer duct 11. As a result, the space between the partition plate 16 and the heat insulating wall 2 becomes the outer layer duct 12 above the storage chamber 6, and the ceiling portion 3A
An inner layer duct 11 above the storage chamber 6 is formed between the partition plate 16 and the partition plate 16.

The outer layer duct 1 above the storage chamber 6
2 and the front end portions of the inner layer duct 11 are the outer layer discharge port 21 and the inner layer discharge port 22 formed in the front and rear of the upper edge of the opening 8.
Is in communication with. In addition, rectifying honeycomb materials 23 and 24 are attached to the respective discharge ports 21 and 22.

On the other hand, in the bottom duct 26 below the bottom plate 4 of the storage chamber 6, a fan casing 27 is arranged on the bottom wall 2C, and a grill 28 of the fan casing 27 is provided with a suction type propeller fan. Blower 29 is attached. The lower ends of the inner layer duct 11 and the outer layer ducts 12, 12 are separated from the bottom duct 26, but they communicate with the inside of the fan casing 27, respectively, and are sucked from the bottom duct 26 when the blower 29 is operated. The air flows through the inner duct 11 as indicated by the solid arrow in the figure.
In addition, as shown by the broken line arrow in the figure, the left and right outer layer ducts 1
It is blown out toward 2 and 12, respectively.

The air blown to the inner layer duct 11 passes between the heat exchange fins F of the cooler E and the refrigerant pipe P from the bottom to the top and is heat-exchanged with these to be cooled. It rises inside and is discharged from the inner layer discharge port 22 toward the opening 8. On the other hand, the air blown to the outer layer duct 12 rises as it is and is discharged from the outer layer discharge port 21 toward the opening 8. Cold air or the like discharged from the discharge ports 22 and 21 returns to the inside of the bottom duct 26 from the suction port 31 formed at the lower edge of the opening 8.

As a result, in the front opening 8 of the storage chamber 6, an inner and outer two-layer air curtain K consisting of an inner cool air curtain K1 and an outer protective air curtain K2.
And a part of the inner cool air curtain K1 circulates in the storage chamber 6 to cool it to a predetermined temperature. The upper surface of the bottom wall 2C of the heat insulating wall 2 has a drain receiving portion 32.
The drain pipe 30 is provided at the bottom of the drain receiving portion 32.
Are pierced through the bottom wall 2C. Then, defrost water dropped on the drain receiving portion 32 during defrosting of the cooler E, drainage from the storage chamber 6, and the like are discharged from the drain pipe 30.

Here, as described above, on the outside of the lower end of the partition plate 14, the tube plate C of the cooler E and the heat exchange fins F1 inside thereof are provided.
Since the gap G between and is open, it is blown out from the blower 29, passes between the tube sheet C and the heat exchange fins F1, and exchanges heat with these heat exchange fins F1 and the refrigerant pipes P. A part of the dry low temperature cold air (cool air flowing through the inner layer duct 11) is divided by the partition plate 1 as shown by a solid arrow in FIG.
4 into the outer layer duct 12 outside. Thereby, the moisture in the outer layer duct 12 and the inner and outer layer duct 1
Since the temperature difference between Nos. 1 and 12 is reduced, the outer layer duct 12
Condensation on the outer surface of the partition plate 14 and the upper surface (outer surface) of the partition plate 16 caused by the cooling of the inner layer duct 11 is eliminated or suppressed. Therefore, it is possible to eliminate or alleviate the inconvenience caused by the condensation water dripping on the bend portion B and freezing as in the conventional case.

Next, FIGS. 5 and 6 show another configuration of the present invention. In each drawing, the same reference numerals as those in FIGS. 1 to 4 are the same. In this case, the partition plate 14 is continuously attached to the inner ends of the upper surfaces of the tube plates C, C of the cooler E as in the conventional case, but the outer surface of the partition plate 14 (the surface on the outer layer duct 12 side) is cooled. Located above the tube plate C of vessel E,
A gutter plate 33 is attached. The gutter plate 33 projects from the partition plate 14 into the outer layer duct 12 with a dimension substantially similar to the width of the tube sheet C, and is inclined rearward low as shown in FIG.

With such a structure, even if the dew condensation formed on the outer surface of the partition plate 14 and the upper surface of the partition plate 16 flows down along the outer surface of the partition plate 14, it is blocked by the gutter plate 33 as shown in FIG. After flowing backward, after that, it travels along the inner surface of the back wall 2A of the heat insulating wall 2, flows down to the drain receiving portion 32, and is discharged from the drain pipe 30. Therefore, it is possible to prevent the dew condensation that has occurred on the outer surfaces of the partition plates 14 and 16 before dripping on the bend portion B of the cooler E, and the disadvantage due to the freezing of the bend portion B is eliminated.

Next, FIG. 7 shows another embodiment. In this case, the gutter plate 33 which is also inclined rearwardly low is
It is projected on the outer surface of the partition plate 14 at a position further apart from the tube sheet C. Here, since the vicinity of the tube sheet C is at the beginning when it is blown out from the blower 29, the flow of air rising in the outer layer duct 12 is also regulated (rectifying region), but this air flow is also the tube sheet C (or the blower). 29) As it moves away from the upper part, it gradually gets disturbed. In this embodiment, since the gutter plate 33 is attached at a position beyond this rectifying area (a position further apart from the tube sheet C), the air inside the outer layer duct 12 is prevented by the gutter plate 33 protruding from the partition plate 14. It is possible to suppress the inconvenience of disturbing the rectification area of.

Next, FIG. 8 shows another constitution of the present invention. In each figure, the same reference numerals as those in FIGS. 1 to 7 are the same. In this case, at the rear part of the upper surface (outer surface) of the partition plate 16 which is the bottom surface of the outer layer duct 12 above the storage chamber 6, the central part is sharply pointed forward and the left and right side parts are the partition plates 14, 1.
The outer layer duct 1
The gutter plate 36 extending to the vicinity of the outer side surface of the outer surface 2 and 12 is the outer layer duct 1.
It is attached so as to project into the inside of the unit 2.

With this structure, even if the dew condensation on the upper surface of the partition plate 16 flows backward, it is blocked by the gutter plate 36 as shown in FIG. 8 and guided so as to be separated from the partition plates 14, 14. After that, it flows down the outer surface of the partition plate 3 and the like, flows down in the outer layer duct 12 to the drain receiving portion 32, and is discharged from the drain pipe 30. Therefore, it is possible to prevent the dew condensation generated on the upper surface of the partition plate 16 from dripping on the outer surface of the partition plate 14 and dropping to the bend portion B of the cooler E, and the disadvantage caused by the freezing of the bend portion B is eliminated. Especially in this case,
Since the gutter plate 36 is provided at a position extremely far from the cooler E, the inconvenience that the flow of air in the outer layer duct 12 is disturbed by the gutter plate 36 is also minimized.

[0036]

As described above in detail, according to the invention of claim 1, the partition plate for partitioning and forming the outer layer duct on the side of the inner layer duct is provided together with the tube plate of the cooler installed in the inner layer duct. Since it is arranged on the inner side of the tube sheet, a part of the dry low temperature cool air that exchanges heat with the cooler and flows to the inner layer duct flows into the outer layer duct outside the partition plate. Therefore, the difference between the humidity of the outer layer duct and the temperature of the inner and outer layer ducts is reduced, and the dew condensation on the outer surface of the partition plate is eliminated or suppressed, so that the inconvenience caused by the freezing of the outer layer duct side portion of the cooler is eliminated or It will be reduced.

According to the second aspect of the present invention, the outer surface of the partition plate for partitioning and forming the outer layer duct on the side of the inner layer duct together with the tube sheet of the cooler installed in the inner layer duct is located above the tube sheet. Since the gutter plate is provided so as to project, it is possible to prevent the dew condensation that has occurred on the outer surface of the partition plate before it drip to the portion of the cooler on the outer layer duct side. Therefore, the inconvenience caused by the freezing of the outer duct side portion of the cooler is eliminated.

According to the invention of claim 3, in addition to the above, since the gutter plate is provided at a position beyond the rectifying area of the air flowing in the outer layer duct, the outer layer duct is formed by the gutter plate protruding from the partition plate. It is possible to suppress the inconvenience that the air rectification area in the inside is disturbed, and it is possible to reduce the adverse effect of the gutter plate on the air circulation in the outer layer duct.

According to the fourth aspect of the present invention, since the gutter plate directed in the direction away from the partition plate is provided on the inner bottom surface of the outer layer duct above the storage chamber, the gutter plate is formed on the inner bottom surface of the outer layer duct above the storage chamber. It is possible to prevent the dew condensation water from flowing to the partition plate and flowing along the partition plate to drip on the outer layer duct side portion of the cooler. Therefore, the inconvenience caused by the freezing of the outer duct side portion of the cooler is eliminated. Further, since the gutter plate is provided so as to project from a position far from the cooler, it is possible to minimize the inconvenience that the flow of air in the outer layer duct is disturbed by the gutter plate.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a low temperature showcase of the present invention.

FIG. 2 is a perspective view illustrating the duct structure of the low temperature showcase of the present invention.

FIG. 3 is an enlarged perspective view of a cooler side portion of the low temperature showcase of the present invention.

FIG. 4 is a plan sectional view of a lower portion of the low temperature showcase of the present invention.

FIG. 5 is an enlarged perspective view of a cooler side portion of another low temperature showcase of the present invention.

6 is a plan sectional view of a lower portion of the low temperature showcase of FIG.

7 is an enlarged perspective view of a cooler side part showing another embodiment of the low temperature showcase of FIG. 5. FIG.

FIG. 8 is a transparent perspective view of another low temperature showcase of the present invention.

FIG. 9 is an enlarged perspective view of a cooler side portion of a conventional low temperature showcase.

10 is a plan sectional view of a lower portion of the low temperature showcase of FIG.

[Explanation of symbols]

 1 Low-temperature showcase 2 Heat insulation wall 3 Partition plate 4 Bottom plate 6 Storage room 8 Opening 11 Inner layer duct 12 Outer layer duct 14, 16 Partition plate 33, 36 Gutter plate B Bend part C Tube plate E Cooler F Heat exchange fin G Gap K1, K2 Air curtain P Refrigerant piping

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiro Sakai 2-5-5 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (4)

[Claims] 1. A cooler is installed in an inner-layer duct that is partitioned from a storage chamber, and an outer-layer duct is partitioned and formed laterally of the inner-layer duct by a partition plate and a tube plate of the cooler. A low temperature showcase in which two layers of inner and outer air curtains are formed in an opening of a storage chamber, wherein the partition plate is arranged inside a tube plate of the cooler. 2. A cooler is installed in an inner layer duct that is partitioned from a storage chamber, and an outer layer duct is defined and formed laterally of the inner layer duct by a partition plate and a tube plate of the cooler. In a low temperature showcase formed by forming two layers of inner and outer air curtains in an opening of a storage chamber, a low temperature characterized in that an outer surface of the partition plate is provided with a gutter plate located above the tube plate of the cooler. Showcase. 3. The low temperature showcase according to claim 2, wherein a gutter plate is provided at a position beyond a rectifying area of air flowing in the outer layer duct. 4. A cooler is installed in an inner layer duct that is partitioned from the storage chamber, and an outer layer duct is defined and formed laterally of the inner layer duct by a partition plate and a tube plate of the cooler. In a low temperature showcase formed by forming two layers of air curtains inside and outside the opening of the storage room, a gutter plate directed in a direction away from the partition plate is provided on the inner bottom surface of the outer layer duct above the storage room. A low-temperature showcase characterized by that.