JPH0823466B2 - Refrigerated showcase - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating showcase, and more particularly to a refrigerating showcase cooling structure having a double-structured display room.

[0002]

2. Description of the Related Art For example, in order to refrigerate and display fresh food such as sushi material while maintaining its quality, it is extremely important to prevent excessive drying in the display room and prevent natural convection of air. Is. From such a point of view, a double structure composed of an inner box accommodating an object to be displayed such as fresh food and an outer box surrounding the inner box to define a cool air circulation passage between the inner box and the inner box. Various refrigerating devices having a mold display room have been proposed by the applicant (see Japanese Patent Application No. 1-51857, etc.).

In the refrigerating machine having the double structure type display room, the cooler room in which the cooler included in the refrigerating apparatus and the cool air circulating fan are built is provided in the middle of the bottom passage of the cool air circulating passage. The air cooled by the cooler, that is, the cool air is sent from the bottom outward path to the cool air circulation passage. While flowing through the circulation passage, the cool air takes heat from the inner box and its inside to cool, and the temperature itself rises and returns from the bottom return path to the aforementioned cooler chamber.

[0004]

As described above, in the conventional refrigerating apparatus having the double-structured display chamber, since the cool air flows in the cool air circulation passage only in one direction, the cool air immediately before returning to the cooler chamber is obtained. At the bottom return path, the temperature rise of the cold air cannot be ignored. That is, the cooling of the inner box portion adjacent to that portion is insufficient. Therefore, there is a problem that a well-cooled and low-temperature portion and an insufficiently-cooled and relatively-high-temperature portion are generated inside the inner box, and convection of internal air in contact with the displayed object occurs. It was

The present invention has been made to solve the above problems, and an object of the present invention is to provide a refrigerating showcase having a relatively simple structure and having a uniform internal temperature distribution.

[0006]

In order to achieve the above-mentioned object, according to the present invention, a refrigerating machine having a double-structured display room having a cold air circulation passage and a machine room disposed therebelow. In the showcase, a cooler chamber is defined between the bottom outward path and the bottom return path of the cold air circulation passage. This cooler chamber contains a cooler that forms a part of the refrigeration circuit and a cool air circulation fan, and a heat-conducting cold plate attached to the upper part of the cooler extends into the bottom return path to form an inner box. It is located close to the bottom plate.

[0007]

In the present invention having the above-described structure, the air in the cool air circulation passage and the cooler chamber is forcedly circulated by the cool air circulation fan, the cooler cools the air, and the cool air is supplied to the inner box and the inside thereof. To cool. Since the heat-conducting cooling plate has one end cooled by the cooler, it takes heat from the returning cold air in the bottom return path, the bottom plate of the adjacent inner box and its vicinity to cool it.

[0008]

Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals indicate the same or corresponding parts.

FIG. 1 is a front perspective view of a refrigerating showcase according to this embodiment, and FIG. 2 is a rear perspective view thereof. This type of refrigerated showcase generally indicated by reference numeral 1 is widely used for refrigerating and displaying fresh foods such as sushi ingredients in sushi restaurants and the like, and is also called a "neta case". 1 and 2, a refrigerating showcase 1 includes an upper display room 2 and a lower refrigeration circuit machine room 3, and both side ends of the display room 2 are
Each is closed by a side cover 4. The power cord 5 and the ground wire 6 extend from the rear cover 8 of the machine room 3, and the tip of the drain pipe 7 also projects. Turn on the power supply used to control the refrigerating operation of the refrigerating showcase 1.
The off switch S is also attached to the rear cover 8, and a ventilation port 9 which is an intake port for cooling air described later is also provided.
A sliding door 11 used for putting in and out of refrigerated food is provided on the rear surface of the display room 2 and is divided by a center frame 10 in the center.

In FIG. 3, which shows a vertical cross section taken along the line III--III of FIG. 1, the display room 2 includes an inner box A for storing fresh foods to be displayed, for example, sushi items, and an outer box surrounding the inner box A. A cold air circulation passage C is formed between the two, and the details thereof will be described later. FIG. 4 shows IV-IV of FIG.
A vertical vertical section along a line is shown. Referring to FIGS. 3 and 4, the inner box A includes a bottom plate 21, a pair of side plates 23 at both ends thereof, a horizontal top plate 25 extending in the longitudinal direction similarly to the bottom plate 21, an inner front windshield 26, and Sliding door 1
It is mainly composed of 1.

On the other hand, the outer box B includes a pair of side frames 2
7, a top frame 29 for connecting these side frames 27, the side cover 4 described above, the top cover 31 at the top, the front multi-layer windshield 33, and the sliding door 11.
However, the bottom surface side is formed of heat insulating structures 56a and 56b which serve as partition walls with the machine room 3 described later. As is clear from the above description, the rear surface side of the display room 2 is only the sliding door 11, and the sliding door 11 also serves as the rear surface of the inner box A and the rear surface of the outer box B.

The cold air circulation passage C comprises a bottom outward passage 41, a side outward passage 43, a ceiling passage 45, a front passage 47 between the windshields 26, 33, a side return passage 49 and a bottom return passage 51.

In particular, as is clear from FIG. 4, the bottom plate 21
Is inclined so that the front surface side becomes lower, and the front and rear ends thereof are supported by the support members 35a and 35b, and the heat insulating structures 56a and 56a.
It is supported on b and defines a bottom outward path 41. Furthermore,
A heat insulating member 37 is attached to the lower surface of the bottom plate 21 so that the low temperature of the cool air is not largely transmitted to the inside of the inner box A. On the other hand, the top plate 25 that defines the ceiling passage 45 and the top frame 29 are connected by a fixing member 39, and the ceiling passage 45 and the front passage 47 communicate with each other through a narrow gap above the inner windshield 26.

Next, the structure of the machine room 3 will be described with reference to FIGS. 5 and 3 showing a horizontal cross section taken along the line VV of FIG. The machine room 3 is roughly divided into a cooler room 60, a compressor room 80, a condenser room 100, and a front warming room 110.
The cooler chamber 60 is located between the bottom outward path 41 and the bottom return path 51, and is defined by a heat insulating block 65 which is a box-shaped heat insulating structure housing the cooling or cold air circulation fan 61 and the cooler 63. The heat insulating block 65 is preferably made of an integrally molded product such as Styrofoam, and its mounting and fixing method will be described later. The heat insulating member 37 on the lower surface of the bottom plate 21 is
It extends from above the bottom outward path 41 to above the cooler 63, and terminates immediately above its left end (in FIG. 3).

Between the cooler 63 and the heat insulating member 37, a heat conductive cooling plate 67, which is preferably made of, for example, a copper plate, is sandwiched and further extends into the bottom return path 51. Since there is no heat insulating member 37 on the lower surface of the bottom plate 21 of
It directly contacts the lower surface of the bottom plate 21 and is bent at the boundary portion 67a. The cooler 63 is a flexible tube 63a through which the refrigerant flows.
And the end plates 63b on both sides and a plurality of fins sandwiched between the end plates 63b. The end plate 63b is hermetically sealed by the two wind direction plates 69a, 69b to the partition plate 71 which also serves as the support frame of the cooling fan 61. It is connected. As a result, all the air that has flowed into the inlet plenum 73 of the cooler chamber 60 and has passed through the cooling fan 61 is directed to the wind direction plate 69.
a, 69b, the end plate 6 of the cooler 63
Flow between 3b.

An outlet guide 75 is provided on the air outlet side of the cooler 63, and the outlet side of the cooler 63 is divided into a main passage 77a directed to the bottom outward passage 41 and a reversal passage 77b directed to the bypass passage 79. That is, the outlet guide 75 has a closing plate 75 a and a guide plate 75 b extending to the bottom surface of the heat insulating block 65, and the end plate 63 b of the cooler 63.
The cold air flowing along the inside of the is guided from the inversion passage 77b to the bypass passage 79. Closing plate 75a and guide plate 7
The upper end of each of 5b is the heat insulating member 3 on the lower surface of the bottom plate 21.
7, the main flow path 77a and the reversal flow path 77b are
Substantially completely partitioned.

The bottom return path 51 is provided with a horizontal partition plate 52, which is divided into a lower main return path 51a and an upper auxiliary circulation path 54. FIG. 6 shows a horizontal cross section taken along line VI-VI in FIG. 3, but clearly shows that the auxiliary circulation passage 54 communicates with the bypass passage 79. The flow and action of the cooling air flowing through the cool air circulation passage C will be described with reference to FIGS. 6 and 3, and the cooling fan 61 will be described.
The air sucked in and flowing into the inlet plenum 73 flows through the cooling fan 61, is guided by the wind direction plates 69a and 69b, and flows through the fin portion of the cooler 63 (between the two end plates 63b). At this time, the heat of vaporization is taken by the refrigerant flowing through the flexible tube 63a to be cooled. The main flow of the cooled air passes through the main flow path 77a on the outlet side of the cooler and goes to the bottom outward path 4.
Inflow to 1. This cold air flows through the bottom outward path 41 and flows into the side outward path 43, but is shielded by the heat insulating member 37, and the inside of the inner box A is not excessively cooled. Furthermore, the cold air
It flows through the side outward path 43, flows separately through the ceiling passage 45 and the front passage 47, and then flows again so as to join at the side return path 49. While flowing through the side outward path 43, the ceiling passage 45, the front passage 47, and the side return path 49, the cool air cools the inside of the inner box A,
The temperature of the air itself rises, flows through the main return path 51a of the bottom return path 51, and returns to the inlet plenum 73.

On the outlet side of the cooler 63, the substream of the cool air which is divided by the guide plate 75b of the outlet guide 75 and flows into the reversing passage 77b is a bypass passage between the end plate 63b and the partition wall of the cooler chamber 60. 79, and flows through the auxiliary circulation passage 54 on the horizontal partition plate 52 to remove the heat inside the inner box A from the lower surface of the bottom plate 21. In the embodiment, the cooling plate 67 is a copper plate having a high thermal conductivity and is cooled by the cooler 63, so that the heat can be more effectively taken from the inside of the inner box A. The cooling plate 67 may be an aluminum plate, or a plate-shaped heat pipe having the same effect.

3 and 4 described above, and VII in FIG.
The structures of the compressor chamber 80, the condenser chamber 100, and the front warming chamber 110 will be described with reference to FIG. 7 showing a vertical cross section along the line VII.

The heat insulating structures 56a and 56b forming the bottom surface of the outer box B of the display room 2 are inclined so that the front surface side (left side in FIGS. 4 and 7) becomes lower like the bottom plate 21. A vertical support partition 81 extends from the vicinity thereof. The horizontal partition plate 83 having a hat-shaped cross section supports the lower end of the support partition wall 81 on the one hand and communicates with the rear cover 8 on the other hand, and the thermal insulation pad 65 made of ceramics.
The heat insulating block 65 is supported via a and 65b.
As described above, the heat insulating block 65 is made of Styrofoam, but has a high heat insulating property, and is supported by the ceramic heat insulating pads 65a and 65b having a high melting temperature and a high flash point, separated from the horizontal partition plate 83, and separated from the supporting partition wall 81. Since they are also separated from each other, they are sufficiently protected from the heat of condensation described later. As the material of the heat insulating pads 65a and 65b, wood, cork, heat resistant resin, or the like can be used. Horizontal partition plate 83
Extends over the entire machine chamber 3, but forms a recess 83a in the vicinity of the compressor 85. Compressor 8
5 is adjacent to the vent hole 9 of the rear cover 8 and has a bracket 87.
It is fixed on. The compressor 8 in the compressor room 80
A condenser fan 89 is supported on the front side of 5
It is supported and fixed by 1a and 91b. The shroud 93 protruding upward from the horizontal partition plate 83 is
Surrounding the wings of.

An inverted hat-shaped bottom plate 103 having an elastic rubber pad 101 attached at a proper position on the lower surface faces and is joined to the horizontal partition plate 83 to define a condenser chamber 100 therebetween.
At the installation portion of the compressor 85, the horizontal partition plate 83 is a recess 83a.
Therefore, a substantial condenser chamber is not formed in this portion.

Except for this portion and below the fan 89, and substantially below the heat insulating block 65, a condensing pipe 105 is installed in a meandering manner on the lower surface of the horizontal partition plate 83 and the upper surface of the bottom plate 103, and a spacer. It is supported and fixed by 107. The condensing pipe 105 communicates with the refrigerant compressor 85 and the cooler 63 in terms of a refrigeration circuit, and a passage for cooling air is formed between the upper and lower condensing pipes 105.

As is apparent from FIGS. 4 and 7, the front cover 11 rising from the support partition 81, the front vertical portion 83b of the horizontal partition plate 83, and the front flange portion of the bottom plate 103.
A front warm air chamber 110, which is defined by 1 in cooperation with the front end portions of the heat insulating structures 56a and 56b, extends in the longitudinal direction over substantially the entire length of the refrigerating showcase 1. Incidentally, the condenser chamber 1
The end of the compressor No. 00 on the compressor side is closed, and an opening 113 is provided at the end on the side of the condensing pipe 105. An opening 117 is formed in the upper end portion of the front cover 111, and communicates with a passage 121 defined between the air guide 119 and the front ends of the heat insulating structures 56a and 56b. The opening ratio of the opening 117 becomes smaller toward the left side in FIG. 3, so that the warm air flowing out from the front warm air chamber 110 to the passage 121 is evenly distributed in the longitudinal direction. Horizontal partition plate 8
The front vertical portion 83b of FIG. 3 has a lateral narrow opening or slot 83c near the opening 113 (2 in FIG. 3).
Shown with a dotted chain line).

Returning to FIG. 5, the compressor 85 and the fan 89.
Although the horizontal positional relationship is shown, the electrical equipment board 130 is provided with the heat insulating block 65 separated.

The flow of air during the refrigerating operation in the machine room 3 having the above-described structure will be described. Although the flow inside the cooler chamber 60 has been described above, when the fan 89 is rotated, the air inside the compressor chamber 80 is sucked into it, so that the outside air flows in through the ventilation port 9 of the rear cover 8. That is, the external air flows in through the ventilation port 9, flows around the compressor 85, and cools the compressor 85 before reaching the fan 89.

The air flown into the condenser chamber 100 by the fan 89 flows between the condensing pipes 105 and removes heat from the refrigerant to condense it. A part of the air, that is, warm air, which has taken up the heat of condensation to raise its temperature, flows out laterally through the opening 113. The remaining warm air flows into the front warm air chamber 110 through the opening 83c, passes through the opening 117 of the front cover 111, and passes through the passage 1
The air flows into the inside 21, is guided by the air guide 119, and flows out along the outer surface of the windshield 33 of the display room 2. The ratio at which the opening 117 is provided in the front cover 111, that is, the opening ratio is set as described above, and the warm air flows evenly on the outer surface of the windshield 33, so that the fog is appropriately removed. The above-described setting of the aperture ratio can be realized by changing the pitch along the longitudinal direction when the opening 117 is formed of a plurality of round holes, but the diameter of the round holes may be changed. Further, the opening 117 may be a plurality of square holes or elongated slots, which can be appropriately selected.

In the above-mentioned embodiment, the structure of the machine room 3 is divided into four chambers, that is, a cooler room, a compressor room, a condenser room and a front warming room in terms of its function. Of course, the cooler room and the compressor room may be considered as the upper room, the condenser room as the lower room, and the front warming room as the front room.

Further, in the above embodiment, the cooling plate 6
Although 7 is provided in the auxiliary circulation passage 54, if the auxiliary circulation passage 54 is not provided in the bottom return passage 51, the cooling plate may be directly arranged therein. Even in that case, in order to effectively cool the inner box A, it is preferable to attach it to the bottom plate 21 of the inner box as in the above-described embodiment.

[0029]

EFFECTS OF THE INVENTION Since the heat conductive cooling plate of the present invention has a high thermal conductivity and one end thereof is directly cooled by the cooler, heat can be effectively removed from the bottom plate of the inner box portion which is in contact with the returning portion of the cold air circulation passage. Since the bottom plate and its vicinity are cooled by taking away the heat, the inside of the inner box of the display room is evenly cooled throughout and the uneven temperature distribution does not occur. As a result, the quality of the displayed items
Holds well.

[Brief description of drawings]

FIG. 1 is a front perspective view of a refrigerating showcase according to an embodiment of the present invention.

FIG. 2 is a rear perspective view of the refrigerated showcase of FIG.

FIG. 3 is a vertical vertical sectional view taken along the line III-III in FIG.

FIG. 4 is a vertical vertical sectional view taken along the line IV-IV of FIG.

5 is a horizontal cross-sectional view taken along the line VV of FIG.

6 is a horizontal cross-sectional view taken along the line VI-VI of FIG.

7 is a vertical vertical sectional view taken along the line VII-VII of FIG.

[Explanation of symbols]

 1 Refrigerated Showcase 2 Display Room 3 Machine Room 21 Bottom Plate 37 Insulation Member 41 Bottom Outward Path 51 Bottom Return Path 60 Cooler Room 61 Cooling Fan (Cold Air Circulation Fan) 63 Cooler 67 Heat Conductive Cooling Plate A Inner Box B Outer Box C Cold air circulation passage

Claims (2)

[Claims] 1. A refrigerating showcase in which a display room is stacked above a machine room for a refrigeration circuit, wherein the display room includes an inner box, an outer box surrounding the inner box, and the inner box. , A cooler chamber that is formed between the outer boxes and that forms a part of the machine chamber and that houses a cooler and a cool air circulating fan. A refrigerating showcase, which is formed between the return path and has a good heat conductivity and is attached to the upper surface of the cooler and extends into the bottom return path. 2. The cooling plate is connected to the bottom plate of the inner box via a heat insulating member just above the cooler, and directly attached to the bottom plate in the bottom return path. Refrigerated showcase as described.