JPH04190076A - Freezing case - Google Patents

Abstract

PURPOSE:To prevent the blockading of an auxiliary passage due to ice by arranging a metallic baffle plate, whose upper end is contacted with a spacer, between the front surface of an electric heater and the lower part of a back wall. CONSTITUTION:A metallic baffle plate 36, whose upper end is contacted with a spacer 29, is arranged between the front surface of an electric heater 33 and the lower part of a back wall 10A. When a door 8 is opened, entering atmosphere passes through an auxiliary passage 30 from air suction holes 28 together with the side stream of the entering atmosphere and arrives at a recovery passage 16, however, the temperature of a cooler 12 is lower than -20 deg.C, the temperature of the spacer 29 becomes substantially same degree as the cooler 12 by heat conduction from the cooler 12 and a temperature in the auxiliary passage 30 becomes lower than the temperature of the storage chamber 18 whereby frosting is generated in the air suction holes 28 and a venting hole 32 while the frost grows during cooling operation and becomes ice. The ice is molten by the heat of the spacer 29, heated by the radiation heat of an electric heater 33 excited upon the defrosting operation of the title case.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a refrigeration case in which an auxiliary passage is formed in the front part of a cooler disposed in the back area of the cold air passage.

(b) Conventional Technical Publication No. 1987-8746 (F25D 17108
), the main body is composed of an insulating wall with an opening at the front, and partition plates are arranged at appropriate intervals from the inner surface of the insulating wall to form a cold air passage and a storage room. In a refrigerated showcase in which an air curtain is formed by forced circulation of cold air, there is a cooler at the back of the cold air passage, and a part of the cold air flow from the cooler is placed between the cooler and the partition plate located in front of the cooler. A thermally conductive partition plate that forms an auxiliary passageway with an open top leading to the bottom of the storage room.The blower is supported so that it is located above the cooler.The upper end is attached to the back wall of the insulation wall, and the lower end is attached to the upper end of the partition plate. A configuration is adopted in which support plates are respectively disposed so as to be inclined downwardly.

(c) Problems to be Solved by the Invention In the above-mentioned conventional technology, part of the cold air that has been heat exchanged in the cooler is supplied to the lower part of the storage chamber through the auxiliary passage.
When such a configuration is adopted for refrigeration, the temperature of the cold air itself is approximately -20 degrees Celsius, and the cold air is throttled through the blow-off holes formed in the back wall of the partition plate, that is, the pressure is reduced. Above, the temperature around the air outlet becomes below the dew point and frost forms.During the cooling operation, the frost gradually grows and becomes ice, which coats the air outlet and flows through the auxiliary passage to the cold air passage and the storage room. The problem arose that the two could no longer communicate with each other.

The present invention aims to solve these problems.

(d) Means for Solving the Problems As a means for solving the above-mentioned problems, the present invention provides a main body composed of a heat insulating wall with an opening at the front, and a partition plate with an appropriate distance from the inner wall of the heat insulating wall. is arranged to form a cold air passageway and a storage chamber, a cooler is arranged in the back area of the cold air passageway, and a metal gap is provided between the front face of the cooler and the rear wall of the partition plate. In the refrigeration case in which an auxiliary passage is formed by disposing a spacer to communicate the cold air passage with the storage chamber, an electric heater that is energized when defrosting the cooler is disposed below the spacer, and a front surface of the electric heater is arranged. A configuration is adopted in which a metal baffle plate is disposed between the spacer and the lower part of the back wall, the upper end of which touches the spacer.

(*) Effect According to the above means, during cooling operation, the temperature of the cooler is the freezing temperature, and the spacer is at approximately the same temperature as the cooler due to heat conduction from the cooler. The temperature inside the auxiliary passage is lower than the temperature in the storage room, so when the cool air containing moisture passes through the auxiliary passage, frost forms on the walls of the auxiliary passage, and this frost is caused by the cooling operation. This ice grows inside and becomes ice, but this ice is heated by the radiant heat of the electric heater that is energized during defrosting operation, and is melted by the heat of the spacer whose temperature rises.

Further, when the electric heater is energized, the baffle plate functions to moderate heating of the extreme portion of the back wall of the partition plate.

(F) Example The present invention will be described in detail below with reference to the drawings. 1 is an upper refrigerator which is formed of a heat insulating wall 4 having an opening 6 on the front side and a plurality of transparent doors 8 which can be opened and closed at the opening. Case 2
A low-temperature showcase whose main body is constituted by a lower refrigerating case 3 formed by a heat insulating wall 5 having an open lower upper surface, and sides 129 provided on both sides of the upper and lower refrigerating cases. Both cases have cold air passages 16, 17 in which partition plates 10, 11 are arranged at appropriate intervals from the inner walls of the respective heat insulating walls 4, 5, and coolers 12, 13, feeders, 1L 41! 14, 15 are installed. A storage chamber 18, 19 is formed, and an air outlet 20, 21 and an inlet 22, 23 are formed opposite to each other at both ends of the openings 6, 7, and both openings are closed with each independent forced circulation cold air flow. The air curtains AI and A2 are formed to cool both storage chambers to freezing temperature.

Both storage compartments may have the same or different temperature controls.

24 is a shelf arranged in the storage room 18, and the partition plate 1
It is supported by a pair of vertically elongated left and right columns 25 fixed to the back wall portion 10A of 0.

26 is a transparent partition plate that partitions the storage chamber 18 into left and right sides;
The pressure change when the door is opened is from the right side to the left side of the storage chamber 18,
or vice versa. The front end of this partition plate 18 is a vertical support 2 that partitions the center of the opening 6 into left and right sides.
7, and the cold air passing through this gap reaches the suction port 22.

Reference numeral 28 denotes a plurality of intake holes formed vertically along the back wall portion 10A, and these holes communicate with the downstream area of the cooler 12 of the cold air passage 16. 29 is the cooler 12 and the back wall portion 1;
An auxiliary passage 30 communicating with a portion of the intake hole 28 is formed between the cooler 16 and the back wall 10A by a metal spacer disposed between the cooler 16 and the back wall 10A. The spacer 29 has a large number of ventilation holes 32 formed in the upper wall 31.
2 can communicate with the auxiliary passage 30 and the downstream section of the cooler 12 of the cold air passage 16. 33 is a lower wall 34 of the spacer 29
An electric heater consisting of a sheathed heater placed below the cooler 12 and energized when the cooler 12 is defrosted;
A pair of left and right metal fixings are held so as to face the lower front surface which serves as the air inlet. Reference numeral 36 denotes a metal baffle plate disposed between the electric heater 33 and the back wall portion 10A, and a bent portion 37 bent forward at a right angle at the upper end is attached to the lower wall 34 to connect the back wall portion 10A. There is a gap therebetween to reduce heat transfer from the electric heater 33 to the back wall portion 10A.

According to this configuration, the cold air forcedly circulated within the refrigeration case 3 forms an air curtain A1 extending from the outlet 20 to the inlet 22 as shown in FIG. 3, and returns to the cooler 12.
After the heat exchange is completed, the main flow that is blown out from the outlet 20 again is separated from the inner flow of the air curtain A1, and flows rearward above and below the shelf 24, and flows from the suction hole 28 to the auxiliary passage 3.
0 to the downstream area of the cooler 12 of the cold air passage 16, where heat is exchanged in the cooler 12, and a substream joins the cold air which reaches the outlet 20.

When the door 8 is opened as shown by the two-dot chain line in FIGS. 3 and 4, a part of the cold air forming the air curtain Al changes in pressure due to the opening, and a part of it becomes
As shown by the dotted chain arrow, the outside air leaks to the outside through the opening 6, and on the other hand, the same amount of outside air as this leaked cold air is drawn in by the air curtain A1 and the inner flow of this air curtain A1, as shown by the white arrow in FIGS. 3 and 4. Enter the storage room 18 as shown,
This incoming outside air is included in the side stream and reaches the cold air passage 16 from the intake hole 28 through the auxiliary passage 30. Due to conduction, the temperature of the spacer 29 is approximately the same as that of the cooler 12, and the temperature inside the auxiliary passage 30 is lower than the temperature of the storage chamber 18.
When cold air containing moisture passes through the ventilation holes 32, frost is formed on the intake holes 28 and the ventilation holes 32, and this frost grows and becomes ice during the cooling operation.

This ice is heated by the radiant heat of the electric heater 33 that is energized during the defrosting operation, and is melted by the heat of the spacer 29 whose temperature increases.

Furthermore, when the electric heater 33 is energized, the baffle plate 36 functions to moderate heating of the extreme portion of the back wall 10A of the partition plate 10.

(g) Effects of the invention According to the present invention described above, the following effects are produced.

■Ice that adheres to the walls of the auxiliary passage during cooling operation is melted by the heat of the spacer, which is heated by the radiant heat of the electric heater that is energized during defrosting operation, and the temperature rises. Good circulation of cold air can be achieved by avoiding the closure of the auxiliary passage caused by this.

■When the electric heater is energized, the baffle plate acts to reduce the heating of the extreme portion of the back wall of the partition plate, so it can assist in heating the food that is close to the lower part of the back wall.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings all show embodiments of the present invention, and FIG. 1 is an enlarged sectional view of the main part, FIG. 2 is a perspective view of the main part, and 3F5! ! J is a cross-sectional view taken along the line AA in FIG. 5, FIG. 4 is a cross-sectional view taken along the line B-B in FIG. 5, and FIG. 5 is an overall perspective view of the low-temperature showcase. 4...Insulating wall, 8...Door, 10...Dividing board,
10A... Back wall, 12... Cooler, 14
...Blower, 16...Cold air passage, 18...Storage room, 29...Spacer, 30...Auxiliary passage,
33... Electric heater, 36... Baffle plate.

Claims (1)

[Claims] 1. The main body is composed of a heat insulating wall with an opening at the front, a partition plate is arranged at an appropriate distance from the inner wall of the heat insulating wall to form a cold air passage and a storage room, and a back area of the cold air passage is formed. A refrigerating case in which a cooler is disposed in the cooler, and a metal spacer is disposed between the front surface of the cooler and the back wall of the partition plate to form an auxiliary passageway for communicating the cold air passage with the storage chamber. An electric heater that is energized during defrosting of the cooler is arranged below the spacer, and a metal baffle plate whose upper end is in contact with the spacer is arranged between the front surface of the electric heater and the lower part of the back wall. A frozen case with .