JPS60134178A - Cold air circulation type open 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] [Technical field to which the invention pertains] This invention provides a defrosting system that includes inner and outer ventilation passages each having a built-in fan so that a two-layer air curtain is formed at the opening during cooling operation. The present invention relates to a cold air circulation type open showcase in which, during operation, outside air is introduced so as to flow backward through the outside ventilation path and flows through the inside ventilation path to defrost the air.

[Prior art and its problems]

As this type of open zipper case, a multi-stage type shown in FIG. 1 is known. In FIG. 1, a main case 1 having an opening 1a for taking out products on the front side has an outer box 2 formed of a heat insulating wall, and an inner case 1 arranged with an appropriate gap between the outer box 2 and the outer box 2. A box 8 is provided, and a shelf board 4 is installed inside the inner box 8.
A display room 5 partitioned into multiple stages is formed. Further, a partition wall 6 is provided between the outer box 2 and the inner box 3 so as to divide the gap into two, thereby forming an inner ventilation passage 7 and an outer ventilation passage 8. The inside ventilation j! Both ends of 87 are openings 1
・The upper and lower sides of a form a Suita lower a and a suction lower b, respectively, and both ends of the outer ventilation passage 8 are adjacent to the Suita lower a and suction lower b, respectively, and form an air outlet 3a and an inlet 8b on the outside thereof. .

The blowout lowers a and 8a are equipped with an air regulating fluid 9 having honeycomb-shaped ventilation holes, a cooler 11 and a fan 12 are installed in the inner ventilation passage 7, and a reversible rotation fan 12 is installed in the outer ventilation passage 8. A possible fan 18 is provided.

In the above-mentioned open showcase, during the cooling operation, indoor air is circulated through the inner ventilation passage 7 in the direction of arrow A by the fan 12, and is cooled by the cooler 11 to become cold air, and this cold air is transferred from the Suita lower a. An air curtain 15 for shielding the inside of the display room 5 from outside air is formed in the air outlet opening 1a, and the inside of the display room 5 is cooled. Furthermore, indoor air circulated through the outside ventilation passage 8 in the direction of arrow A by the fan 18 creates an air curtain 16 on the outside so as to protect the air curtain 15.
As a result, the inside of the display room 5 can be cooled and kept cold even more efficiently.

Further, during the defrosting operation, the operation of the cooler 11 is stopped and the fan 18 is rotated in the reverse direction. As shown in FIG.
and is sucked into the outside ventilation passage 8. This outside air flows backward through the outer ventilation passage 8 in the direction of arrow B and is discharged from the suction port 8b.
In this case, uncooled air is sucked into the inner ventilation passage 7 as shown by the arrow C by the fan 12 forming the air curtain 15, and is caused to flow in the direction of the arrow A. The frost formed on the walls of the cooler 11 and the inner ventilation passage 7 during the cooling operation is removed by the heat of the outside air.

However, in the conventional open showcase, during defrosting operation, only a portion of the outside air is sucked into the inner ventilation passage 7 by the fan 12, and a considerable amount of outside air is discharged from the suction port 8b as shown by the arrow. Since the defrost particles escape to the outside of the machine, the defrosting time becomes longer and the temperature of the displayed products increases during the defrosting operation.

[Purpose of the invention]

The object of the invention is to provide a cold air circulation type open zipper case that increases the amount of outside air sucked into the inner ventilation passage from the outer ventilation passage so that defrosting can be performed by short-time defrosting operation. shall be.

[Key points of the invention]

In this invention, the fans built into the inner and outer ventilation passages are arranged close to each other, and the suction side ventilation passages of both the fans are made a common ventilation passage, so that the fans can be rotated in reverse during defrosting operation. The outside air sucked into the outer ventilation passage by the operated fan and discharged into the common ventilation passage is drawn directly into the inner ventilation passage from the common ventilation passage by the fan of the inner ventilation passage.

[Embodiments of the invention]

In the drawings of the embodiment, parts common or identical to those in FIGS. 1 and 2 are designated by the same reference numerals.

FIG. 8 shows a first embodiment of the present invention, in which a fan 12 and a fan 18 are disposed at the bottom of the main case 1 and close to each other, and partition plates 18 and 19 separate the ventilation channels. is divided into a suction side and a discharge side. The ventilation paths of the fans 12 and 18 on the suction side are not provided with partition walls, and a common ventilation path 21 is formed, and the open end thereof forms a common suction port 21a. Further, the fan motor 12a of the fan 12 is a variable speed motor that can be switched between regular speed and high speed.

In the above configuration, the fan 12 is constantly operated during the cooling operation, and as in the conventional open showcase,
Air curtains 15 and 16 are blown into the opening 1a by the fans 12 and 18, and the display room 5
The inside is efficiently cooled and kept cold. In this case, the cold air that formed the air curtain 15 and the air that formed the air curtain 16 are both sucked in from the suction port 21a and flow through the ventilation passage 21 as a mixed air flow, but compared to the conventional open air that has separate suction ports. Even in the silicon case, the cold air flow and the air flow that formed the air curtains 15 and 16 are usually in a considerably mixed state near the suction port, and the cooling characteristics are not degraded by sharing the ventilation path 21. .

Next, during the defrosting operation, the operation of the cooler 11 is stopped,
The fan 18 is operated in reverse rotation and the fan 12 is operated at high speed. As shown in FIG. 4, the fan 12 blows out an air curtain 15 to the opening 1a, while the fan 13 sucks outside air from the Suita mouth 8a and sends it through the outside ventilation path 8 in the direction of arrow B. and is discharged into the ventilation passage 21. This outside air is drawn into the inner ventilation passage 7 by the fan 12 in the direction of arrow C. At this time, the outside air is sped up by the fan 12 which is operated at high speed, and the air flows through the ventilation passage 21 in the direction of arrow A. , and almost the entire amount is sent into the inner ventilation passage 7. As a result, the frost formed on the cooler 11 and the inner ventilation passage 7 is quickly removed by the amount of heat contained in the large amount of outside air, and the defrosting operation is completed in a short time.

5 to 7 show a second embodiment, in which two fans 12 each having a variable speed motor 12a are used, and the fans 12 and 13 are connected to the main body case with the fan 18 in the center. 1 are arranged horizontally in a row in the longitudinal direction. Reference numeral 23 denotes an integrally formed partition plate that partitions the ventilation paths of the fans 12 and 13 into a suction side and a discharge side. The inner ventilation passage 7 and the outer ventilation passage 8 formed on the discharge side of the fans 12 and 18 are partition walls 5a that partition adjacent fans at the bottom of the main body case 1.

Partition walls 6b and 6c are provided to allow the discharge side of each fan to communicate only with the respective ventilation passages, and are formed side by side in the longitudinal direction of the main body case 1.・'Fan 12 and 1
A common ventilation path 21 having a common suction port 21a is formed on the suction side of the third and third components.

In the above configuration, during cooling operation, the ventilation passage 21 and the inner ventilation passage 7 are aligned with the arrow A as shown in the sixth core and FIG.
Air curtains 15 and 16 are formed in the same manner as in the first embodiment by the indoor air that is circulated as shown in FIG. At the same time, the inside of the display room 5 is efficiently kept cool. During defrosting operation, the 8th
As shown in the figure, due to the reverse rotation of the fan 18, the Suita exit 8
The outside air that is sucked in from A and flows backward through the outer ventilation passage 8 as shown by the arrow B is discharged into the center of the ventilation passage 21, and is drawn from both sides of the ventilation passage 21 by the fan 12 (Fig. 5) to the inner ventilation passage 7 (Fig. 5). ). This outside air defrosts the cooler 11, etc., and the same effect as in the first embodiment is obtained.

Furthermore, in the first embodiment, when assembling the main body case 1 shown in FIG. 3, the fan 18, the partition wall 6, the fan 12, and the inner box 8 must be sequentially assembled inside the outer box 2, which requires a long working time. , Also, maintenance inside the main body case takes a long time for the same reason, but the second
In the embodiment shown in FIG. 7, the partition plate 28, the wings 12 and 13 supported by arm-like members with no openings shown in the partition plate 23, and the partition walls 6'a, 6b, and 6c are assembled in advance as a fan unit. Therefore, when assembling or maintaining the main body case 1, it is only necessary to install the fan unit, and the working time is significantly shortened.

In the above embodiment, a multi-stage open showcase has been described, but the present invention can also be applied to a flat showcase having an opening on the top surface of the main body case, and similar effects can be obtained.

〔Effect of the invention〕

According to this invention, the fans blowing in the inner ventilation passage and the outer ventilation passage are arranged close to each other in the bottom area of the main body case, and the suction side ventilation passages of both the fans are connected to the common ventilation passage. Since it was formed as
During defrosting operation, almost all of the outside air introduced by the fan in the outside ventilation path flows into the inside ventilation path.
Since defrosting is performed using this large amount of outside air, the defrosting time is extremely short, and the temperature of the displayed products does not rise during the defrosting operation.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional open showcase, Fig. 2 is a sectional view for explaining air flow during defrosting operation, Fig. 3 is a sectional view of the first embodiment of the present invention, and Fig. The figure is a sectional view corresponding to FIG. 2, FIG. 5 is a perspective view of the main parts of the second embodiment of the invention, and FIG. 6 is an overall sectional view taken along the line ■-■ in FIG. Fig. 7 is a cross-sectional view of the entire structure along the line ■-■ in Fig. 5, Fig. 8... Inner box, 6.5a, 6b, 6c...
Partition wall, 7...Inner ventilation duct, 8...Outer ventilation duct, 11
... Cooler, 12.18 ... Fan, 15.16.
...Air curtain, 21...Ventilation duct. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 8 Figure 7 A

Claims (1)

[Claims] 1) An inner ventilation passage containing a cooler and a fan, and an outer ventilation passage containing a fan are formed between an outer box and an inner box of the main case having an opening on the front or top surface. During the cooling operation, both of the fans form a two-layer air curtain in the opening, and during the defrosting operation, the outside air is introduced so as to flow backward through the outer ventilation duct by rotating the fan in the outer ventilation duct in the opposite direction. In the cold air circulation type open showcase that defrosts the air by sending it into the inner ventilation duct,
A cold air circulation type open showcase characterized in that the suction side ventilation paths of both of the fans are a common ventilation path. 2. A cold air circulation type oven showcase in which a variable speed fan motor is used as a fan built in the inner ventilation passage in the open showcase according to claim 1.