JPS5850910A - 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 The present invention relates to an air curtain type open showcase.

Conventional laminar air flow type open showcases are equipped with protective covers to prevent outside air from entering and cold air leaking during the night when the store is closed.

However, when using a protective cover, the leakage of cold air is reduced, but the heat exchange between the air inside the refrigerator and the cooler takes place in the same way, so the temperature inside the refrigerator drops to the limit, making it difficult to maintain the specified temperature. However, it also had the disadvantage of being less effective in reducing power consumption. □The present invention solves the above drawbacks by lowering the rotation speed of the blower for laminar airflow when using the protective cover, reducing the amount of heat exchange between the air and the cooler, maintaining a predetermined temperature, and saving power consumption. This is what we are trying to do.

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

In the figure, reference numeral 1 denotes an open showcase main body, which has an opening 1al at the front and an inner box 3 provided inside an insulating box body 2 to form a cold air passage 4. Reference numeral 6 is provided at the bottom of the cold air passage 4, and the cooled air is supplied to the cooler 8 of the cooling cycle provided in the cold air passage 4 from the air outlet 6 formed at the upper part of the front opening to the suction lower 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. The protective cover 9 is pulled out downward from the top of the open showcase body 1 when the store is closed, and is provided so as to close the front opening 1a as indicated by the dashed lines 23, . . . 1 in FIG. There is. 10 is a switch for changing the rotational speed of the blower 6. The actuator 11 of this switch 10 is capable of projecting upward through the suction hole 12 of the suction lower. This actuator 11 is connected to the protective cover 9.
A U-shaped locking piece 14 is bent and bent so that a hook-shaped hook 13 formed at the end thereof is caught.

Further, the blower 6 is of a two-speed type that switches the rotation speed, and the normally closed contact 10a of the switch 1o is connected to the power source.
through the winding 6a on the high speed rotation side.

6C is connected. Then, the low-speed rotation side winding 5b of the blower 6, esc
is connected to power.

In such a device, the protective cover 9 is pulled downward at night when the store is closed, and the front opening 1a is closed, and the front opening 1a is closed.
When the hook 13 is hooked on the locking piece 14 of the actuator 11 (as shown by the two-dot chain line in FIG. 1), the switch 1o becomes the normally open contact 1.
Switching to the 0b side, current flows to the low speed side of the blower, reducing the amount of circulation in the cold air passage.

As a result, power consumption due to the torque reduction of the blower 6 is reduced, and power saving can be achieved. Also,
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 showcase, 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 rotation speed of the blower is switched to a low speed side when the store is closed, it not only stabilizes the temperature inside the open showcase and saves on electricity costs, but also requires no special switch operation. It is possible to improve usability and ensure that you do not forget to change the switch.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view of an open showcase 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 part of Fig. 1, and Fig. 4 is a sectional view of FIG. 3, and FIG. 6 is a sectional view of the fourth figure with the protective cover pulled down. 6. 1 *sa*e* open showcase body, 16 a
aa*...Front opening (opening surface), 6...Blower, e
...Protective power/<-110...Switch 0 Name of agent: Patent attorney Toshio Nakao and one other person. 1st rlA Figure 2

Claims (1)

[Claims] An oven showcase body that discharges air from the outlet toward the suction port and forms a laminar air flow on the opening surface, a protective cover that closes the opening surface and prevents leakage of the laminar air flow, and an air blower that forms the laminar air flow. and a switch, the switch opens and closes in conjunction with the movement of the protective cover, and lowers the rotational speed of the blower when the protective cover closes the one opening side.