JPS6218828B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an open show case in which at least two or more layers of air curtains are formed in openings for storing and taking out products, and the present invention is directed to preventing overflow of airflow from the openings. purpose.

Generally, as shown in FIG. 1, this type of open case main body 1 has an opening 4 for storing and taking out products on one side, for example, the front, of an inner box 3 defining a storage chamber 2, and an opening 4 at an appropriate distance from the outer wall of the inner box. A plurality of partition walls 5, 6 are arranged to surround the inner box 3, and a plurality of passages 7, 8, air outlets 9, 11 and suction ports of each passage are provided at both ends of the opening. 10 and 12, a cooler 13 and a blower 14 are installed in the inner passage 7, and a blower 15 is installed in the outer passage 8, and by operating the cooler and both blowers, a high-velocity cooling air flow shown by the solid line is directed to the inside. Passage 7 circulates a slow protective air flow indicated by a dashed line through outer passage 8 to form a low-temperature air curtain 16 inside opening 4 and a protective air curtain 17 outside to cool storage chamber 2. It protects the cold air mass in the storage room from the outside air.

The cooling and protection air flows forming the two air curtains are unable to maintain the initial velocity at the outlet ports 9 and 11 due to air resistance in the longitudinal direction of the opening 4, and as they flow down, the cold air mass of the storage chamber 2, Since the outside part is diffused by entraining stationary outside air, the majority of the cooling air flow includes the cold air mass and a part of the protection air flow, and the majority of the protection air flow includes the cooling air mass and a part of the outside air. However, the diffused part of the protective air flow overflows from the opening 4 and accumulates on the floor at the front of the main unit, creating a cold sensation at the customer's feet. It will be a cold yell to give.

That is, the volume of each cold air flow blown out from the air outlets 9 and 11 and the intake air volume of each air stream sucked in from the air outlets 10 and 12 are equal because they circulate through the same passages 7 and 8; The suction air volume of the suction port 12 is smaller than that of the port 10, and the air curtain creates a protective air flow that is sequentially sucked into each passage 7, 8 from the inside of the storage room, which is a closed space, and is diffused to the outside of the storage room, which is an open space. In order to supplement the intake air volume by sucking in outside air near the suction port 12 instead of a part of the air, cold air occurs and the refrigeration load increases.

Among the above drawbacks, as a means to prevent overflow,
A method has been used to reduce the amount of suction air by forming a through hole 18 in the partition wall 6 and discharging a portion of the protective air flow to the outside, but this method can certainly reduce overflow. However, there was a drawback that the amount of outside air sucked from the suction port 12 increased, and the refrigeration load further increased.

The present invention has been made in view of these drawbacks, and embodiments thereof will be described below with reference to FIGS. 2 to 6.
In addition, in FIGS. 2 to 6, the same reference numerals as in FIG. 1 indicate the same parts.

19 shown in FIG. 2 is an inner passage 7 and an outer passage 8.
As shown in FIG. 3, a part of the protective air flow immediately after forming the air curtain 17 is converted into a high-velocity cooling air flow. In other words, a part of the protective airflow is introduced into the inner passageway 7 by the ejector effect of the cooling airflow passing through the inner passageway 7, thereby increasing the suction air volume of the inner passageway 7. In addition, by setting the suction air volume of the outer passage 8 to a smaller value and maintaining the sum of the suction air volumes of both air flows constant, the suction speed of the inner portion of the protective air flow is increased.
The diffusion width is small, that is, the turbulence of the air curtain 17 is reduced, and overflow from the opening 4 can be prevented.

FIG. 4 shows another embodiment of the invention, in which the partition wall 5
A flow path 19 is formed on the outlet side of the flow path, and a guide plate 20 is provided on the inner side of the flow path to form an ejector device as shown in FIG. Protection is achieved by forcibly introducing the air into the passage 7, increasing the air volume from the inner passage 7, and setting the air volume from the outer passage 8 to a smaller value, thereby maintaining the sum of the air volumes of both air streams constant. The diffusion width of the airflow is small, that is, the turbulence of the air curtain 17 is reduced, and overflow from the opening 4 can be prevented.

FIG. 6 shows another embodiment of the present invention, in which three passages 7, 8, 21 are formed to form a three-layer air curtain 16, 17, 22 in the opening 4. By introducing a portion of the protective air flow into the intermediate passage 17 via the flow path 19, the same effect as in the embodiment of FIG. 2 is achieved.

As described above, the present invention blows out each air flow that has passed through a plurality of passages to an opening formed on one side of a storage room for storing and taking out products, thereby creating a multi-layered air curtain including a low-temperature air curtain in the innermost layer. In an open show case formed as a curtain, a section that defines an outermost passageway through which a slow airflow passes, and an inner passageway adjacent to the outermost passageway through which an airflow having a faster velocity than the airflow passes through. This outermost wall,
A flow path is formed that connects both inner passages, and a part of the air flow passing through the outermost passage is introduced into the inner passage by the air flow passing through the inner passage. The amount of air passing through the outermost passage can be reduced by guiding part of the air passing through the outermost passage to the inner passage through the flow passage using an ejector effect that utilizes the speed of the airflow. As a result, it is possible to reduce the diffusion width of the outermost air curtain to prevent the protective air flow from overflowing from the opening, thereby preventing the occurrence of cold hail, and also preventing an increase in the refrigeration load due to overflow. can.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a conventional open-shallow case, Fig. 2 is a longitudinal cross-sectional view of an open-shallow case of the present invention, Fig. 3 is an enlarged view of the same essential parts, and Fig. 4 shows another embodiment of the present invention. 5 is an enlarged view of the same essential parts, and FIG. 6 is a longitudinal sectional view showing still another embodiment of the present invention. 5, 6... Partition wall, 7, 8... Passage, 16, 1
7...Air curtain, 19...Flow path.

Claims (1)

[Claims] 1. An opening formed on one side of the storage room for storing and taking out products by blowing out each airflow that has passed through multiple passages to form a multi-layered air curtain including a low-temperature air curtain in the innermost layer. In the case, a partition wall that partitions an outermost passageway through which a slow airflow passes and an inner passageway adjacent to the passageway through which an airflow faster than the airflow passes through the outermost passage, An open show case characterized in that a flow path is formed to communicate both inner passages, and a part of the air flow passing through the outermost passage is introduced into the inner passage by the air flow passing through the inner passage.