JPH02219974A - Low temperature show case - Google Patents

Abstract

PURPOSE:To scarcely form stagnation of air not affected by the flow of chilled gas at a ceiling wall by so forming holes as to cross over at least one of upper and lower step faces of steps formed on the ceiling wall of a chilled gas passage and a step difference face. CONSTITUTION:A step difference face 52, an upper step face 51A disposed at the downstream side to be connected to the upper end of the face 52, and a step difference 53 having a lower step face 51B disposed at the upstream side to be connected to the lower end of the face 52 are provided on a ceiling wall 12A of a partition plate 12, and a plurality of holes 54 of suitable shape are so formed as to cross over both of at least one of the faces 51A and 51B and the face 52. The holes 54 are so introduced at the part of chilled gas passing a chilled gas passage 19 from the passage 19 to a storage chamber side as to be disposed along the lower face of the ceiling wall 12A of a partition plate 12 to prevent dew from generating on the lower face of the ceiling wall. The holes 54 are formed to cross over the faces 51A, 51B and the face 52 to reduce the height of the face of the holes even if the areas of the holes are equal as compared with that the holes are formed only at the step difference face.

Description

[Detailed description of the invention] [Object of the invention] Industrial field of application The present invention relates to a low-temperature showcase in which an air curtain of forced circulation cold air is formed behind a front opening. The present invention relates to a low-temperature showcase configured to prevent dew condensation in the upper part of a storage room, which is likely to be maintained at a low temperature.

There is a prior art document, for example, Japanese Patent Publication No. 14988/1988, which describes a showcase that has an open front side and closes this opening with an air curtain of forced circulation of cold air. In particular, Fig. 2 of this publication discloses a technique in which a step is formed in the top wall of a partition plate forming a cold air passage so that the height increases from the rear to the front, and a hole is formed in this step. This hole directs some of the cold air flowing through the cold air passage into the storage room in order to keep the temperature of the top wall of the partition plate near the cold air outlet above the dew point temperature of the indoor cold air and prevent condensation on the ceiling wall. It is meant to lead you to the top.

Problems to be Solved by the Invention In the example shown in FIG. 2 of the above-mentioned publication, the holes are formed in a plane substantially perpendicular to the direction in which cold air flows, so that there is no flow from the cold air passage to the storage room. In order to increase the amount of cold air blown out directly, it is necessary to increase the height of the vertical surface.In other words, in order to provide this hole, the height between the top shelf and the ceiling wall of the partition board must be increased. The hole must be made narrower by at least the length of the hole in the vertical direction, which has the problem of reducing the effective volume inside the refrigerator. In particular, when a plurality of steps are to be formed, the effective volume inside the refrigerator will be further reduced in proportion to the number of steps, and there is a concern that the reduction will not be negligible.

On the other hand, by setting the size of this hole small, it can be used as a limiting factor in the height direction, but if it is made too small, the hole will not have the effect of guiding cold air into the storage room, and it will have the opposite effect. There was a problem in that the air in the storage room was pulled out (so-called ejector), and the original purpose of the filter was to prevent dew condensation.

Therefore, it is an object of the present invention to provide a low-temperature showcase configured to reduce restrictions in the height direction even when the opening area of the hole provided in the ceiling wall is maintained the same as before.

[Structure of the invention]

Means for Solving the Problems The present invention provides an insulating wall having an opening in the front, a cold air passage in which a partition plate is arranged at an appropriate interval from the insulating wall, and a cooler and a blower are installed, and an opening. To provide a low-temperature showcase, which has an air outlet formed at the rear upper part and an air inlet formed at the rear lower part, and in which cold air is forced to flow from the air outlet toward the suction port and an air curtain is formed behind the opening. The ceiling wall of the partition board has a step surface, an upper step surface that extends to the upper end of the step surface and is located on the leeward side, and a lower step surface that continues to the lower end of the step surface and is located on the windward side. A plurality of holes are formed in this step so as to span the step surface and at least one of the upper and lower surfaces to direct a portion of the cold air flowing through the cold air passage to the lower surface of the ceiling wall of the storage room. It was designed to guide you.

Since the hole was formed so as to span the step surface and at least one of the upper and lower surfaces of the step formed in the ceiling wall portion of the working cold air passage, even if the opening area was the same, the hole only appeared on the step surface. Compared to the case where the holes are completely formed, the height of this step surface is smaller, and the amount of decrease in the internal volume due to the formation of the step is smaller. In addition, the cold air guided into the refrigerator from the hole easily flows through the intersection of the upper and lower step surfaces and the step surface, and air stagnation that is not affected by the flow of cold air is less likely to form in this ceiling wall portion.

EXAMPLES Examples of the present invention will be described below with reference to FIGS. 1 to 10. 1 is an upper case 4 made up of a heat insulating wall 3 with an opening 2 for storing and taking out products on the front surface, and a lower part made up of a heat insulating wall 6 with an opening 5 for storing and taking out products on the top surface. This is a so-called dual-type low-temperature showcase whose main body is constituted by a case 7.

The upper case 4 is provided with two transparent jilts with handles on the front surface of the heat insulating wall 3, which are rotatably supported by a pair of upper and lower hinges 10, and have handles that open and close the opening 2 freely. A storage room 16 with metal partition plates 12 and a bottom plate 13 arranged at appropriate intervals and equipped with a plurality of shelves 14 and a fluorescent lamp 15 as an illumination device, a plate fin type cooler 17, and an air blower. 18, partition plate 12 and bottom plate 13
and a cold air passage 19 formed by the heat insulating wall 3 and the opening 2
A Suita port 20 and a suction port 21 that face each other are formed along both upper and lower edges of the inner side. In this example, in order to make the width of the opening of the upper case 4 smaller than the width of the front opening of the heat insulating wall 3, a transparent window is installed at the front end of the side wall as an inclined wall that slopes inward toward the front (this is called a bay window). The upper case with a bay window is sometimes called a bay window case)22
The air outlet 20 is formed such that the width (horizontal width) of the air outlet 20 is larger than the width of the opening of the upper case 4.

Then, by forcedly circulating the air (this is called cold air) heat-exchanged by the cooler 17 as shown in the arrow by the blower 18, the air is forced to circulate along the back surface of the transparent door 2 from the Suita outlet 20 to the suction port 21. A flowing cold air stream or air curtain (AC) is formed to cool the storage chamber 16.

Reference numeral 27 denotes a door storage section which is formed below the bottom wall 3E of the heat insulating wall 3 and also serves as a lighting room, and is provided with a fluorescent lamp 28 as a lighting device for illuminating the interior of the lower case 7 at its front part, which will be described later. Stores the sliding door of the lower case.

The lower case has a ceiling wall 6A in the rear half of the opening 5 of the heat insulating wall 6, a transparent door 31 as two sliding doors on the left and right that are inclined downward in the front half and are disposed so as to be slidable in the front and rear directions. A handrail 32 is provided as a handrail made of metal such as stainless steel that decorates the three sides of the opening 5 of the heat insulating wall 6, and a Vibe-on as a main cooler is provided on the outer surface of an inner box 33 that is the inner wall of the heat insulating wall 6. The inside of the freezer compartment 36 is cooled by natural convection of cold air heat exchanged between the sheet type cooler 34 and a roll bond type cooler 35 as an auxiliary cooler provided at the lower part of the ceiling wall 6A.

40 is a machine room formed at the lower part of the heat insulating wall 6, in which the plate fin type cooler 17 of the upper case 4, the first compressor 41 and the first condenser 42 that constitute the refrigeration cycle, and the main A second compressor and a second condenser (the first compressor 4
1 and the first condenser 42 (not shown because they are in the shadow of the first condenser 42) are installed respectively.

The upper case 4 is constructed such that the front end of the bottom wall of the heat insulating wall 3 is approximately in the middle of the upper surface of the lower case 7, and the rear end of the bottom wall protrudes rearward from the back wall of the heat insulating wall 6 of the lower case 7. It is constructed so that a space K can be formed at the rear, and its side walls communicate with each other. Then, the above-mentioned space K may be used to install a drain pipe 43 for guiding the waste water from the upper case 4 to the machine room 40.

In this example, this space is communicated with the door storage section 27, and a part of the air warmed by cooling the compressor, condenser, etc. in the machine room (this is called warm air) passes through the space K and is stored in the door. Part 2
The structure that leads to 7 is closed. In addition, 44 is a cover attached to cover more than half of the rear opening of the lower case 7 to form the space K, and an exhaust port 45 is provided at the top of the cover.
It is shaped like this.

Next, to explain the structure near the air outlet of the upper case 4, the front end of the transparent window (bay window) 22 fixed to the front end of the heat insulating wall 3 of the upper case 4 is attached to a door support frame 23 that also serves as a door support. As a result, the opening 2 of the upper case 4 formed by the door support frame 23 is closed by the transparent door 11 which is rotatably supported by the hinge 10! a. The top wall 12A of the partition plate 12 includes a step surface 52, and an upper step surface 51A connected to the upper end of the step surface 52 and located on the leeward side.
Lower step surface 51 connected to the lower end of step surface 52 and located on the windward side
B is provided with a step 53 having a height difference between at least one of the upper step surface 51A and the lower step surface 51B and the step surface 52.
A plurality of holes 54 of an appropriate shape (circular in this example) are formed so as to span both of the holes.

The plurality of holes 54 guide a portion of the cold air passing through the cold air passage 19 from the cold air passage 19 to the storage chamber 16 side along the lower surface of the ceiling wall 12A of the partition plate 12, thereby preventing dew from forming on the lower surface of the ceiling wall. This is to prevent the upper and lower stage surfaces 51A, 51
By forming the hole 54 across B and the step surface 52, the height of the same surface can be made smaller than when the hole is formed only on the step surface even if the opening area is the same. Therefore, the height that can be stored in the storage chamber 16 can be increased compared to the conventional one. Also, in the conventional model, the upper surface sxA
At the intersection of the step surface 52 and the step surface 52, cold air did not flow in and air stagnation occurred, but by forming the holes 54 as in this example, the cold air can easily flow into this intersection. This makes it difficult for air stagnation to form.

Also, between the same surface 51 in the front row of the steps and the Suita outlet 20, there is a
A perforated plate 56 is provided as a current plate, and the Suita exit 20
The main Suita exit 20A is opened downward to form an air curtain, and the transparent window 22 is opened to prevent the transparent window 22 from fogging.
The width of the main air outlet 20A is set to be larger than the width of the opening 2 formed by the door support frame 23. The left and right sides are each approximately 201,111 large.

According to the above configuration, the step surface 52 formed on the top wall 12A of the partition plate 12, the upper step surface 51A connected to the upper end of this step surface 52 and located on the lee side, and the upper step surface 51A connected to the lower end of the step surface 52 and located on the leeward side. Since the hole 54 is formed so as to straddle both the lower step surface 51B located on the windward side, even if the hole has the same opening area, the difference in the step surface is better compared to the case where the hole is formed only in the step surface. The length in the height direction can be reduced. In addition, since the hole is formed so as to straddle the upper and lower step surfaces and the step surface, the cold air led into the storage chamber 16 through the hole will cause air stagnation at the intersection between the upper and lower step surfaces and the step surface. To make <<shi,
It is possible to avoid condensation at intersections where condensation is likely to occur.

〔Effect of the invention〕

As detailed above, according to the present invention, the hole is formed so as to span both the step surface and at least one of the upper and lower surfaces of the step formed in the top wall of the partition plate. Therefore, the height of the step surface can be made smaller in the present invention compared to the case where holes are formed only on the step surface with the same shape and the same opening area, and the height of the step surface can be reduced. It is possible to reduce the decrease in the internal volume of the warehouse. In addition, the cold air led into the storage room through the holes formed across the straddle is less likely to stagnate at the intersections of the upper and lower step surfaces and the step surfaces (so-called corners), and the cold air is efficiently blown against the lower surface of the ceiling wall. It is possible to prevent condensation from occurring.

[Brief explanation of the drawing]

Each figure shows an embodiment of the present invention; FIG. 1 is an enlarged sectional view of section B in FIG. 3, FIG. 2 is an external perspective view of a low-temperature showcase,
Figure 3 is a cross-sectional view taken along line A-A in Figure 2, Figure 4 is an enlarged cross-sectional view of section C in Figure 1, Figure 5 is a perspective view of the partition plate top wall viewed from the bottom, Figures 6 and 7. 8 is a front view and a partial plan view of the top wall of the partition plate, FIG. 8 is a cross-sectional view of another example of how the holes are arranged, and FIGS. 9 and 10 are a front view and a side view of the low-temperature showcase. be. 1...Low temperature showcase, 2...Opening, 3
...insulation wall, 12...partition board, 12A...
・Ceiling wall of partition board, 17...Cooler, 18...
・Blower device, 19... Cold air passage, 20... Air outlet, 20A... Main outlet, 20B... Auxiliary outlet, 21... Suction port, AC... Air curtain, 51A... ...Upper step surface, 51B...Lower step surface, 52...Step surface, 53...Step difference, 54...
- Hole. Figure 4

Claims (1)

[Claims] 1. A heat insulating wall with an opening in the front, a cold air passageway in which a partition plate is placed at an appropriate interval from the heat insulating wall and a cooler and a blower device are installed, and a blower is formed at the rear upper part of the opening. In a low-temperature showcase comprising an outlet and an inlet formed at a rear lower part, the cool air is forced to flow from the outlet to the inlet and an air curtain is formed behind the opening, the top wall of the partition plate is provided with a step having a step surface, an upper step surface continuous to the upper end of the step surface and located on the leeward side, and a lower step surface continuous to the lower end of the step surface and located on the windward side. A low-temperature showcase characterized in that a plurality of holes are formed so as to straddle at least one of the surface and the lower surface and the step surface.