JPH10127434A - Refrigerating show case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent decrease of blow speed of an air curtain of cold air currents by restricting frosting of a heat exchanger to the minimum. SOLUTION: A lower part, a back part, and an upper part of an article containing part 7 which is opened in a front surface are surrounded by a cold air passage 9 in which a cooling device 11 is disposed, and cold air discharged from upper parts at a front end of the cold air passage 9 downward is sucked at lower parts at the front end of the cold air passage 9, so an air curtain A of cold air currents is formed at a front surface of an aperture part. Additionally, a back part and an upper part of the cold air passage 9 are surrounded by an outer air current passage 23, an air curtain C of outer air currents is formed at a front surface of the air curtain A of the cold air currents by outer air currents discharged from the upper part at the front end of the outer air current passage 23, and an outer air intake port 25 of the outer air current passages 23 is provided close to a floor surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerated showcase provided with a product storage section having an open front surface, and an air curtain for preventing outside air from flowing into the product storage section at the front of the product storage section. The present invention relates to a refrigerated showcase formed.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional example of a refrigerated showcase in which an air curtain is formed on the front surface of a product storage portion having an open front surface to enhance the cooling effect in the product storage portion. .

A casing (02) fixed on a base (01) is made of a heat insulating material, and has a vertical cross section that is substantially forward (the left side in FIG. 2 is referred to as “front”). An inner wall (04) having a substantially U-shaped vertical section is disposed inside, and both side surfaces of both are closed by left and right side plates (only one is shown in the figure) (05). 04) and the space surrounded by the left and right side plates (05), the front surface is open, and a plurality of shelves (06)
Is provided as a product storage section (07).

[0004] Between the outer wall (03) and the inner wall (04), a partition wall (08) having a substantially U-shaped vertical section is provided.
The space between 3) and the inner wall (04) is divided into a cool air passage (09) adjacent to the product storage section (07) and an intermediate air flow passage (010) surrounding the cool air passage (09). Have been.

[0005] A cooling device (011) and a fan (012) are provided in the cool air passage (09), and a cool air discharge port (013) that opens downward is provided above the front end of the cool air passage (09). ) Is provided, and at the lower front end, a cold air inlet (014) opening upward.
Is provided.

A fan (015) is provided in the intermediate air flow passage (010).
An intermediate airflow outlet (016) that opens downward in front of and above the cool air outlet (013) is provided, and an intermediate airflow inlet (017) that opens upward in front of the cool air inlet (014) at the lower front end. Is provided.

The front end of the substantially horizontal outside air flow guide plate (018), which is disposed slightly above the ceiling (03a) of the outer wall (03), projects forward from the front end of the ceiling (03a), Between the front end of the ceiling (03a) and the front end of the outside air flow guide plate (018), there is provided an outside air discharge port (019) that opens downward. In the through-hole (020) formed in the outside air flow guide plate (018), the fan (021)
Is provided.

When the cooling device (011) and the fan (012) are operated, cool air flows in the direction of the arrow in the cool air passage (09).
Cool air discharged downward from the cool air discharge port (013) is sucked in by the cool air suction port (014), and a cool airflow air curtain (A) is formed on the front surface of the product storage section (07).

Similarly, when the fans (015) and (021) are operated, an intermediate airflow air curtain (B) is formed between the intermediate airflow discharge port (016) and the intermediate airflow suction port (017). Then, an air curtain (C) of the outside airflow is formed in front of the air curtain (B) of the intermediate airflow.

[0010]

Most of the external airflow discharged downward from the external airflow discharge port (019) is directed downward in front of the intermediate airflow intake port (017) as shown by the arrow in FIG. Pass through. However, part of the intermediate air flows from the intermediate airflow inlet (017) to the intermediate airflow passage (010), and further, a part of the intermediate airflow flows from the cool air intake (014) to the cool air passage (09). As a result, a part of the outside air flow flows to the cool air passage (09).

However, the outside air at the ceiling of the refrigerated showcase is often hotter and more humid than the air at the floor (particularly during the rainy season or during the summer). When flowing through the use passage (09), frost easily adheres to a heat exchanger (not shown) in the cooling device (011). When the amount of frost on the heat exchanger increases, the wind speed of the air curtain (A) of the cold air flow decreases, and the outside air easily flows into the product storage unit (07), and the temperature in the product storage unit (07) increases. At the same time, a vicious cycle in which the amount of frost increases gradually may occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and suppresses frost formation on a heat exchanger as much as possible to prevent a decrease in wind speed of an air curtain of a cool air flow. The purpose of the present invention is to provide a refrigerated showcase.

[0013]

According to the present invention, the above-mentioned problem is solved as follows. (1) The lower part, the rear part, and the upper part of the product storage part having an open front surface are surrounded by a cool air passage provided with a cooling device, and the cool air discharged downward from the upper front end of the cool air passage is cooled by the cool air. Suction at the lower front end of the passage, thereby forming a cold airflow air curtain in front of the opening, and surrounding the rear and upper portions of the cool air passage with an outside airflow passage, and the upper front end of the outside airflow passage. An outside air flow is discharged downward from the outside air flow to form an outside air flow air curtain in front of the cold air flow air curtain, and an outside air intake of the outside air flow passage is provided near the floor surface.

(2) In the above item (1), an intermediate air flow passage surrounding the lower, rear and upper portions of the cool air passage is formed between the cool air passage and the outside air flow passage. The intermediate airflow discharged downward from the intermediate airflow outlet provided at the upper front end of the passage is sucked by the intermediate airflow inlet provided at the lower front end of the intermediate airflow passage, so that the air curtain of the cold airflow and the external airflow And an air curtain of an intermediate airflow.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. It should be noted that the same members as those in the conventional example are denoted by reference numerals excluding “0” from the conventional example,
Detailed description is omitted. In the following description, the left and right sides in FIG. 1 are referred to as “front” and the right side as “rear”.

Outer wall (3) of the refrigerated showcase of the present embodiment
An outer frame (22) having an inverted L-shaped vertical section is provided outside the outer wall (3), surrounding the rear and upper portions of the outer wall (3).
A fan (23) is formed in the outside air flow passage (23) formed between
(24) is provided.

The lower end of the outside air passage (23) is an outside air inlet (25) that opens downward near the floor surface, and an upper part of the front end of the outside air passage (23) has an intermediate air outlet.
External air flow outlets (2
6) is provided.

By the action of the fan (24), the outside air intake (2
The outside airflow taken into the outside airflow passage (23) from 5) is discharged downward from the outside air discharge port (26), and the outside airflow air curtain (C) is placed in front of the intermediate airflow air curtain (B). Form.

According to this embodiment, the air curtain (C)
A part of the outside airflow forming the air flows from the intermediate airflow inlet (17) to the intermediate airflow passage (10), and finally, the cool air passage (9).
However, since the outside air near the floor is lower in temperature than that of the ceiling of the refrigerated showcase and has a lower absolute humidity, the amount of frost formed in the heat exchanger is smaller than in the conventional case. For this reason, the possibility that the wind speed of the cool airflow of the air curtain (A) is reduced is reduced, so that the outside air can be prevented from flowing into the product storage section (7), and the load on the cooling device (11) is reduced.

[0020]

【The invention's effect】

(a) According to the first aspect of the present invention, although a part of the outside air flow forming the air curtain flows into the passage for the cool air, the outside air near the floor surface has a lower temperature than that of the ceiling portion of the refrigerated showcase. In addition, since the absolute humidity is low, the amount of frost formed on the heat exchanger is reduced as compared with the related art. For this reason,
The possibility that the wind speed of the cool airflow of the air curtain is reduced is reduced, so that the outside air can be prevented from flowing into the product storage unit, and the load on the cooling device is reduced.

(B) According to the second aspect of the present invention, since the air curtain has three layers, the cooling effect of the product storage portion is increased as compared with a two-layer air curtain of a cold air flow and an external air flow. .

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a conventional example.

[Explanation of symbols]

 (1) Base (2) Housing (3) Outer wall (3a) Ceiling (4) Inner wall (5) Side plate (6) Shelf (7) Commodity storage (8) Partition wall (9) Cooling passage (10 ) Intermediate airflow passage (11) Cooling device (12) Fan (13) Cold air outlet (14) Cold air inlet (15) Fan (16) Intermediate airflow outlet (17) Intermediate airflow inlet (22) Outer frame ( 23) External air flow passage (24) Fan (25) External air intake (26) External air flow outlet (A) Cool air flow air curtain (B) Intermediate air flow air curtain (C) External air flow air curtain

Claims (2)

[Claims] 1. A lower portion, a rear portion, and an upper portion of a product storage portion having an open front surface are surrounded by a cool air passage provided with a cooling device,
By sucking the cool air discharged downward from the upper front end of the cool air passage at the lower front end of the cool air passage,
An air curtain of a cool air flow is formed on the front surface of the opening, and the rear and upper portions of the cool air passage are surrounded by an external air flow passage, and the external air flow discharged downward from the upper front end of the external air flow passage, A refrigerated showcase, wherein an outside air flow air curtain is formed in front of the cold air flow air curtain, and an outside air intake of the outside air flow passage is provided near a floor surface. 2. An intermediate airflow passage surrounding a lower portion, a rear portion, and an upper portion of the cool air passage is formed between the cool air passage and the outside air flow passage, and the intermediate airflow passage is discharged downward from the upper front end thereof. The intermediate air flow is sucked in at the lower front end of the intermediate air flow passage to form an intermediate air flow air curtain between the cool air flow air curtain and the outside air flow air curtain. Item 7. A refrigerated showcase according to Item 1.