JPH0411202B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air curtain type open show case.

Conventional laminar air flow type open show cases have been provided with protective covers to prevent outside air from entering and cool air from leaking during the night when the store is closed.

However, when using a protective cover, the leakage of cold air is reduced, but because the heat exchange between the air inside the refrigerator and the cooler takes place in the same way, the temperature inside the refrigerator drops to the limit, making it impossible to maintain the specified temperature. However, it also had the disadvantage of having little power saving effect.

In consideration of the above drawbacks, the present invention lowers the rotation speed of the blower for laminar air flow when using the protective cover, reduces the amount of heat exchange between the air and the cooler, and maintains a predetermined temperature and saves power consumption. That is.

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes an open case main body, and an inner box 3 is provided inside a heat insulating box body 2 having an open front surface 1a to form a cold air passage 4. Reference numeral 5 is provided at the bottom of the cold air passage 4, and the air cooled by the cooler 8 of the cooling cycle provided in the cold air passage 4 is supplied from the air outlet 6 formed at the upper part of the front opening to the suction port 7 provided at the lower part. This is a blower for forced circulation of cold air. Reference numeral 9 denotes a protective cover provided at the upper end of the front part of the heat insulating box 2, which is normally biased in the winding direction as in the cord reel system. and,
This protective cover 9 is provided so as to be pulled out from the top of the open show case body 1 downward when the store is closed, and to close the front opening 1a as shown by the two-dot chain line in FIG. 10 is a switch for changing the rotational speed of the blower 5. This switch 1
The actuator 11 of No. 0 can protrude upward from the suction hole 12 of the suction port 7. The actuator 11 is formed by bending a U-shaped locking piece 14 so that a hook-like hook 13 formed at the flexible end of the protective cover 9 is hooked thereon.

The blower 5 is of a two-speed type that switches the rotational speed, and the winding 5a on the high speed rotation side is connected to the power source via the normally closed contact 10a of the switch 10.
5c is connected. The windings 5b and 5c on the low speed rotation side of the blower 5 are connected to a power source via the normally open contact side of the switch 10.

In such a device, the protective cover 9 is pulled downward to close the front opening 1a at night when the store is closed, and the hook 13 is attached to the actuator 1.
1 (two-dot chain line in FIG. 1), the switch 10 switches to the normally open contact 10b side, current flows to the low speed side of the blower, and the amount of circulation in the cold air passage is reduced. As a result, power consumption due to torque reduction of the blower 5 is reduced, and power saving can be achieved. Furthermore, the amount of heat exchanged between the cooler 8 and the air is reduced compared to before, and the temperature inside the refrigerator is stabilized.

As described above, the present invention has a protective cover that opens and closes an opening surface such as a front opening of an open show case, and a blower and a switch that generate a laminar airflow that closes the opening surface are interlocked, so that the protective cover closes the opening surface. Since the speed of the blower is switched to a low speed side when the store is closed, it not only saves power compared to not changing the speed of the blower, but also stirs the air inside the shop case. By doing so, it is possible to make the temperature distribution inside the refrigerator uniform and prevent the temperature rise of the cooled objects in the case and the resulting deterioration of quality. It is possible to realize an open show case that can prevent a decrease in reliability and has improved usability in that these effects can be obtained by opening and closing the protective cover rather than operating a special switch.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view of an open shower case showing an embodiment of the present invention, Fig. 2 is a switching circuit diagram of the blower shown in Fig. 1, Fig. 3 is an enlarged perspective view of the main parts of Fig. 1, and Fig. 4 is a cross-sectional view of FIG. 3, and FIG. 5 is a cross-sectional view corresponding to FIG. 4 with the protective cover pulled down. 1... Open show case body, 1a... Front opening (opening surface), 5... Blower, 9... Protective cover, 10... Switch.

Claims (1)

[Scope of Claims] 1. An open show case body having an opening on the front surface, an air outlet at the upper end and an inlet at the lower end, and forming a laminar airflow on the opening surface; a blower equipped with a high-speed rotation terminal and a low-speed rotation terminal for circulating the laminar airflow, and a switch provided at the suction port for switching between the high-speed rotation terminal and the low-speed rotation terminal of the blower. , a hook provided on the protective cover that engages with the switch, and when the hook engages with the switch, the blower is switched to a low-speed rotation terminal. .