JPS60218572A - Method of circulating air current of cold showcase - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a low-temperature showcase that includes a storage chamber and a stock chamber, and cools this compartment by forced circulation of cold air.

(b) Prior art U.S. Pat. A low-temperature showcase is shown, which is cooled by return cold air forming an air curtain and returning to the evaporator, and has a stock chamber with a lid on the = side.

Since the evaporator is located behind the stock in the refrigerated configuration, the following disadvantages occur.

■ Since the cold air that returns to the evaporator passes through the center of the stock chamber, if a large amount of products are stored in the stock chamber, the flow of the returned cold air will be obstructed by the stock products, resulting in poor heat exchange in the evaporator.

■ When the lid is opened, the outside air that has entered the stock chamber directly flows into the N evaporator, causing extreme frosting on the evaporator and reducing the flow rate of the low-temperature air curtain.

(c) Purpose of the invention The present invention aims to overcome the drawbacks of the prior art.

B) A storage chamber according to the invention, a stock chamber formed directly below the storage chamber and provided with a lid on the front side, and a first passage for forcibly circulating cold air to form a low-temperature air curtain at the opening of the storage chamber. and a second passage for forcing air circulation to form a protective air curtain outside the low-temperature air curtain, and by forming the low-temperature air curtain and guiding only the cold air returning to the evaporator to the stock chamber. An airflow circulation method for a low-temperature showcase that uses a protective air curtain to prevent the temperature of the low-temperature air curtain from rising when the lid is opened.

(E) Examples of the invention The present invention will be described in detail below based on the drawings. (1)
is an open-type low-temperature showcase that can be connected to multiple units, the main body of which is made up of an insulating wall (3) with an opening (2) for storing and taking out products at the front. There is a top plate (4), a back plate (5), and a removable bottom plate (
By arranging 6), a storage room (9) that doubles as an exhibition room is equipped with shelves (7) and fluorescent lights (8), and a drawer 00) that is located directly below this storage room and can be taken in and out is stored. It forms a stock room. (121 is a first passage for circulating cold air that surrounds the storage chamber, and an evaporator (13) is placed behind the back plate, and a blower I is placed directly above the evaporator.
Moreover, the air outlet a9 is formed along the upper end of the opening (2), and the suction opening αe is formed along the lower end of the opening (2). αη is the first
A second passage for protective air circulation surrounding the storage chamber (9) similarly to the passage, in which a blower bracket is arranged at the same height as the blower I in the first passage, and an air outlet (11) is arranged at the same height as the blower I in the first passage. On the outside of the air outlet a9, suction ports (A) are arranged in parallel along the outside of the suction port (16) of the first passage.Both the first and second passages are connected to a heat insulating wall (3 ), top plate (4), back plate (
5) and the bottom plate (6), a partition top plate (21), a partition back plate unit, and a lower duct (c) are arranged. The lower duct defines the lower area of the first passage 0z, and defines the upper part of the stock chamber Qll, that is, the first passage (1
It crosses the lower area of 2 in the front-back direction and slopes backward downward,
In addition, it is arranged such that there is a gap (■) from the bottom plate (6), and its front end crosses directly under the suction port (161) of the first passage 0z and communicates with the suction port (■) of the second passage α9, and its rear end is connected to the suction port (161) of the first passage 0z. Aisle 0z
It communicates with the dorsal area of the body.

In the first passage, the cold air heat-exchanged in the evaporator αa is made into a forced circulation flow by the blower I, and is circulated as shown by the arrows in FIGS. 1 and 2, and a low-temperature air curtain (CA ) to cool the storage chamber (9),
This low-temperature air curtain is formed to cool the stock chamber Qll with the return cold air that returns to the evaporator (131).
The air inside the first passage 0z is made into a forced circulation flow by using the blower α barrel, and the air is forced to circulate as shown by the arrows in Figs. 1 and 2, and a low-temperature air curtain (CA
) to form a protective air curtain (GA) whose temperature is lower than the outside air due to the influence of the air curtain.

(2) is a wind direction plate that is inclined upward and backward from the front of the stock chamber (111) and is arranged in parallel with both the above-mentioned suction ports, and its upper end is connected to the bottom plate (6) at a distance. The return cold air guided above the stock chamber αD from the suction port α6) is transferred to the cold air flowing along the back surface of the bottom plate (6).
b), the stock chamber is oriented downward at 0υ and is pulled out.
) The cold air (b) flows along the upper part, that is, the stocked product (c).

The drawer has a container Qη equipped with an appropriate number of small casters (supports) that roll over the bottom wall of the heat insulating wall, and a large caster 09 that rolls on the installation surface of the low temperature showcase (11).
1, and when stored in the stock chamber (111), the lid 00 closes the opening 01 in the front wall of the heat insulating wall (3).

The country is a dew tray placed above the rear of the stock room αB,
During defrosting, it receives dew from the evaporator α3) and lower duct (231), and directs this dew through the hole (G) formed at the rear end of the insulating wall (
3) Lead to the drain port 04) on the bottom wall. The rear part of the drawer (IO) is located directly below this drip pan. Incidentally, G51 is a drain pipe.

According to this configuration, the cold air circulating through the first passage (12) becomes a low-temperature air curtain (CA) at the opening (2) to cool the storage chamber (9), and then is led to the stock chamber (IIJ). , along the back surface of the bottom plate (6) by the wind direction plate (24).
The cold air flowing through I and ) returns to the evaporator Q31 (a), and the cold air directed downwards to cool the stocked products (c) and returning to the evaporator Q31 (b), It is possible to cool the storage room (9) and the stock room αD with forced circulation cold air, and also without using the cold air (a) flowing along the bottom plate (6) to cool the stock product C2 (g). Since the N evaporator (13) is directly returned to the N evaporator (13), even if outside air enters the stock chamber aυ when the lid is opened, the temperature of the returned cold air can be prevented from increasing significantly, and the low-temperature air curtain It is possible to prevent a decrease in the flow rate of (CA), and also to efficiently cool stock products (c) by the evaporator (131), which can avoid extreme frosting, and cool air directed downward.

In addition, since the stock chamber (11) is cooled only by the returned cold air, even if pressure changes occur in the lid (stock chamber 0 due to opening of 301) and the first passage <121, the second passage aη
This pressure change does not affect , and therefore the protective air curtain (GA) continues to be formed in a normal state, and even if the low temperature air curtain (CA) is slightly disturbed due to the pressure change, the protective air curtain (GA) continues to be formed. The protective air curtain (GA) can prevent outside air from entering the low-temperature air curtain (CA) through the opening (2), and an increase in the refrigeration load at the opening (2) can be avoided.

(F) Effects of the Invention As described above, in the present invention, the stock chamber is cooled only by the returned cold air, so even if the low temperature air curtain is disturbed due to pressure change in the stock chamber when the lid is opened, the protective air curtain will not be disturbed. The protective air curtain can prevent outside air from entering the low-temperature air curtain at the opening.
An increase in refrigeration load can be avoided.

[Brief explanation of the drawing]

The drawings all show an embodiment of the airflow circulation method for a low-temperature showcase according to the present invention, and FIG. 1 is a sectional view taken along line AA in FIG. 3, FIG. 2 is a sectional view taken along line B-B in FIG. 3, and FIG. 3 is a front view. FIG. 4 is an enlarged view of FIG. 2C, and FIG. 5 is a perspective view of the main part. (2)...Opening, (6)...Bottom plate, (9)...
・Storage room, 0υ...stock room, α21...first passage, α31..., evaporator, (In...second passage, (24)...wind direction plate, (to)...・Lid, (C
A)...Low temperature air curtain, (GA)...Protective air curtain. Applicant: Sanyo Electric Co., Ltd., and 1 other representative: Patent attorney: Yasuo Sano Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. A storage chamber, a stock chamber formed directly below the storage chamber and equipped with a lid on the front, a first passage that forcibly circulates cold air to form a low-temperature air curtain at the opening of the storage chamber, and and a second passage that forms a protective air curtain outside the low-temperature air curtain through forced circulation, and only cold air that forms the low-temperature air curtain and returns to the evaporator is guided to the stock chamber. Airflow circulation method for low temperature showcase.