JPH04190074A - Freezing case and cold air circulating method thereof - Google Patents

Abstract

PURPOSE:To permit the reduction of frosting on foods maintained at a freezing temperature by a method wherein a multitude of air suction holes, which guide cold air in a storage chamber into a cold air passage, are formed on the back wall of a partitioning plate. CONSTITUTION:When a door 8 is opened, one part of cold air, forming air curtain A1, leaks to the outside through an opening 6 as shown by the arrow sign of one-dot chain line in a diagram by the change of pressure accompanied by the opening of the door 8 while atmosphere, whose amount is equal to the leaked cold air, enters a storage chamber 18 as shown by an arrow sign described by white figure in the diagram by the engulfing effect of the air curtain A1 and the inside stream of the air curtain A1 thereby arriving at a cold air passage 16 through the air suction holes 28 formed on the back wall 10A of a partitioning plate 10. Accordingly, atmosphere, which enters a freezing case 3 upon opening the door and flows across the storage chamber 18, flows backward and is sucked into a cold air passage 16 whereby the crossing distance of entering moisture in the storage chamber 18 is reduced and frosting on food maintained at a freezing temperature can be reduced remarkably.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a freezing case for maintaining food stored in a storage room at freezing temperature, and a method for circulating cold air therein.

(b) Conventional technology Patent Publication No. 1-39032 (F25D 21104
)'s low-temperature showcase has an insulated wall with a door that can be opened and closed in the front, and a storage room that is arranged along the inner wall of this insulated wall and has a cold air passage equipped with a cooler and a blower fan, and shelves. an upper case comprising a partition plate to form a partition plate and a pair of outlet and suction ports along both upper and lower front surfaces of the storage chamber, and forming a low-temperature air curtain along the front surface of the storage chamber. The upper case of the cage and curl configuration has 2 doors on the door.
It is a refrigeration specification that uses one to three transparent plates and a heat ray reflective coating.

(c) Problems to be Solved by the Invention According to the above-mentioned conventional technology, the air curtain has an effect in which the inner flow and the outer flow entrain air in a substantially stationary state, that is, a vortex flow is continuously generated along the interface. Due to the effect of making air flow in a substantially stationary state, the space between the air curtain and the door has a negative pressure, while the space between the air curtain and the partition board, that is, the storage room, also has a negative pressure. . When the door is opened in a cool state, the outside air containing moisture enters the air curtain due to the entrainment action of the outside flow, and then the negative part of the outside air enters the storage room due to the entrainment action of the inside flow, causing the storage room to close. The air circulates above and below the shelf and returns to the air curtain. In this cycle, the moisture contained in the cold air flowing up and down the shelves is released to attach to food that remains at freezing temperature while the cold air flows backwards and then forwards. Every time the door is opened, the frost that adheres to the food gradually grows and turns into ice, resulting in the problem that the food cannot be sold because of the ice.

The present invention aims to solve the above problems.

(d) Means for Solving the Problems As a means for solving the above problems, the present invention provides an insulating wall with a door that can be opened and closed in the front, a cooler and an air blower disposed along the inner wall of the insulating wall. a partition plate forming a cold air passage equipped with a fan and a storage room equipped with shelves; a pair of left and right columns attached to the back wall of the partition plate; , a structure with a large number of intake holes that guide the cold air from the storage room to the cold air passage was adopted.

Further, in the above configuration, the cold air that has been heat exchanged in the cooler is blown out as an air curtain in the front of the storage room through the cold air passage and returned to the cooler, while a part of the cold air that formed the air curtain is sent through the storage room. A cold air circulation method is adopted in which the cold air is returned from the intake hole to the downstream area of the cooler in the cold passage.

(E) Effect According to the above means, the cold air forced to circulate inside the freezing case forms an air curtain from the outlet to the suction port, returns to the cooler, completes heat exchange, and is discharged from the outlet again. While forming the main stream, the inlet holes separate some of the cool air from the inner flow of the arc curtain and flow backwards above and below the shelves to the downstream area of the cooler in the cold aisle where it is heated by the cooler. It acts to form a side stream that joins the cool air of the main stream that is exchanged and reaches the outlet.

(F) EXAMPLE Below, the present invention will be described in detail based on the drawings. 1 shown in FIGS. 1 to 3 is a transparent door formed of a heat insulating wall 4 having an opening 6 on the front surface, which can be opened and closed freely. The main body is composed of an upper freezing case 2 formed by a plurality of refrigeration cases 8, a lower freezing case 3 formed by a heat insulating wall 5 having an open lower upper surface, and side walls 9 provided on both sides of the upper and lower body freezing cases. In this low-temperature showcase, the two cases have a partition plate 10.
11 to form a cold air passage 16.17 in which coolers 12, 13 and blowers 14, 15 are installed, and a storage chamber 18.19, and air outlets 20 facing both ends of the opening 6.7.
．． 21 and suction ports 22 and 23, respectively, and opens both openings with each independent forced circulation cold air flow.
1 and A2, respectively, and 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 fully 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 in the vertical direction along the back wall portion 10A, and the 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 air intake passage 30 communicating with a portion of the air intake hole 28 is formed between the cooler 16 and the back wall portion 10A by a metal spacer disposed between the cooler 16 and the back wall portion 10A. The spacer 29 is the upper wall 3
A large number of ventilation holes 32 are formed in 1, and these ventilation holes 32
connects the air intake passage 30 with a section of the cold air passage 16 downstream of the cooler 12 . An electric heater 33 is a sheathed heater that is disposed below the lower wall 34 of the spacer 29 and is energized when the cooler 12 is defrosted. It is held by a pair of left and right metal fixtures 35. 36 is the electric heater 3
3 and the back wall part 10A, a bent part 37 whose upper end is bent at a right angle in front is attached to the lower wall 34 so as to be spaced from the back wall part 10A. , to reduce heat transfer from the electric heater 33 to the back wall portion 10A.

According to this configuration, the cold air forcibly circulated within the freezing case 3 forms an air curtain A1 extending from the air outlet 20 to the suction port 22 as shown in FIG. 1, and returns to the cooler 12.
The main flow that is heat-exchanged and blown out from the air outlet 22 again is separated from the inner flow of the air curtain A1 and flows rearward above and below the shelf 24, and flows through the intake hole 28 into the cold air passage 1.
6, and a substream where cool air is combined to reach the downstream area of the cooler 12 in the cooler 12 and reach the heat exchange outlet 20 in the cooler 12.

When the door 8 is opened as shown by the two-dot chain line in FIGS. 1 and 2, a part of the cold air forming the air curtain A1 changes in pressure due to the opening.
As shown by the dotted chain line 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. 1 and 2. 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.

Therefore, when the door is opened, the outside air that enters the freezer case 3 and crosses the storage chamber 18 sinks toward the rear and is sucked into the cold air passage 16 from the intake hole 28, so that the moisture that enters the storage chamber 18 crosses the storage chamber 18. The distance is halved compared to conventional methods, significantly reducing frost formation on food kept at freezing temperatures.

In addition, some of the moisture that enters when the door is opened crosses the storage room 18 and reaches the downstream area of the cooler 12 in the cold air passage 16 from the intake hole 28, so that frost formation on the cooler 12 occurs per unit time. By reducing the amount, you can reduce the number of times you defrost.

(g) Effects of the invention According to the present invention described above, the effects listed below are achieved.

■When the door is opened, the outside air that enters the freezer case and crosses the storage room flows toward the rear and is sucked into the cold air passage through the intake hole, so the traversal distance of moisture entering the storage room is reduced by half compared to the conventional method. , frost formation on foods maintained at freezing temperatures can be significantly reduced, and as a result, freezing on foods can be avoided.

■Some of the moisture that enters when the door is opened crosses the storage room and reaches the downstream area of the cooler in the cold air passage from the intake hole.
It is possible to reduce the number of times of defrosting by reducing the amount of frost formed on the cooler per unit time.

[Brief explanation of drawings]

The drawings all show embodiments of the present invention, and FIG. 1 is similar to FIG. 3A.
-A sectional view, Fig. 2 is a sectional view taken along line B-B in Fig. 3, Fig. 3 is an overall perspective view of the low-temperature showcase, Fig. 4 is a perspective view of main parts, Fig. 5 is an enlarged sectional view of main parts, FIG. 6 is a perspective view of the surroundings of the cooler. 4... Heat insulation wall, 8... Door, 10... Partition board, 10A... Back wall, 12... Cooler,
14...Blower, 16...Cold air passage, 18...
・Storage room, 24...shelf, 25...post, 28
...Intake hole.

Claims (1)

[Claims] 1. An insulating wall with a door that can be opened and closed in the front, and a storage room arranged along the inner wall of the insulating wall and equipped with a cold air passage and shelves equipped with a cooler and a blower fan. a partition plate, a pair of left and right columns attached to the back wall of the partition plate, and a number of intake holes formed in a vertical row on the back wall to guide cold air from the storage room to the cold air passage. A freezing case equipped with. 2. A heat insulating wall with a door that can be opened and closed in the front, and a partition plate arranged along the inner wall of the heat insulating wall and forming a cold passageway equipped with a cooler and a blower fan, and a storage room with shelves; A pair of left and right columns are attached to the back wall of the partition plate, and a large number of intake holes are formed in a vertical row on the back wall and guide cold air from the storage room to the cold air passage. The cold air that has undergone heat exchange in the cooler is blown out as an air curtain in the front of the storage chamber through the cold air passage and returned to the cooler, while a part of the cold air that formed the air curtain is made to cross the storage chamber and exit from the intake hole. A method of circulating cold air in a refrigeration case in which cold air is returned to an area downstream of a cooler in a cold passage.