JPH0356876Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of an open show case in which the front opening of the show case is covered with an air curtain made of cool air.

(Prior art) A partition plate is installed inside a refrigerated or frozen open case to form a duct as a cold air passage, and a cooler and a blower are installed in the duct. Cold air is rectified and blown out from the outlet to the lower suction port, forming a cold air curtain. The cold air is circulated through the front opening and the duct, and the products in the warehouse are kept cool by this continuous cycle of circulating cold air. The handrail at the bottom of the front of the case is also cooled down, causing dew to form on it, making it uncomfortable to touch, so an electric heater is installed to keep it at an appropriate temperature. Inside the refrigerator, there are usually shelves arranged in multiple tiers.
Products such as foods placed on each shelf board are illuminated by, for example, lighting lights placed on the back side of the shelf board.
During non-business hours such as at night, a night cover is attached to the front opening, and at that time, an electric heater is also installed at the inlet to prevent the inlet from becoming blocked by frost.

(Problem to be solved by the invention) When the electric heater at the inlet is energized at night, electricity is applied to each of the electric heaters at the handrail and the inlet, which wastes electricity. Furthermore, due to an operational error, if the electric heater at the inlet is left on even during business hours, electricity is wasted even more, and the electric heater at the inlet is left off when the night cover is attached during non-business hours. However, there was a problem that frost formed on the suction port, making the inside of the refrigerator incompletely kept cool.

The purpose of the present invention is to solve the above-mentioned problems, and therefore, to provide an open show case that can save electric power and eliminate mistakes in operating the electric heater provided at the handrail and the suction port. It is.

(Means for Solving the Problems) The open show case according to the present invention includes an electromagnetic contactor 19 that is switched on and off by switching on and off the light 11 inside the refrigerator, and an electric heater 15 on the handrail on the front side. and electric heater 16 at the inlet of the cold air curtain.
and is configured to be turned on and off by the electromagnetic contactor.

(Operation of means for solving the problem) When the lighting inside the refrigerator is turned on during business hours, the electric heater 15 in the handrail section is energized to maintain the surface of the handrail section at an appropriate temperature. At that time, the electric heater 16 at the suction port is in an off state. When the lighting is turned off during non-business hours, the electric heater 15 on the handrail section is turned off by the action of the electromagnetic contactor 19, and the electric heater 16 on the suction port is energized to prevent frost formation on the suction port.

(Embodiment) Fig. 1 and Fig. 2 show an embodiment of the present invention.As shown in the figures, the open case is composed of a case body 1 made of a heat insulating wall, and the front side of the case is An opening 2 for loading and unloading is formed. In this embodiment, partition plates 3 are provided along the upper and lower parts and the back surface of the case body 1, and an inner wall 4 is further installed inside the partition plates 3. This inner wall 4
A cooler 6 and a blower 7 are provided in the cold air passage 5 between the case body 1 and the partition plate 3, and a blower 9 is also provided in the circulation passage 8 between the case body 1 and the partition plate 3. A cold air curtain and a protective airflow are formed outside the curtain to keep the inside of the refrigerator cool.

A plurality of shelf boards 10 for displaying products are arranged in the warehouse, and illumination lights 11 are attached at appropriate positions, for example, on the back side of the shelf boards 10 as shown. At the top of the opening 2, there are honeycomb-shaped air outlets 12a, 12 that straighten and blow out cold air and protective airflow downward.
b, and a suction port 13 is provided below it. Further, a handrail portion 14 serving as a lower exterior is provided on the outside of the suction port 13.

An electric heater 15 is installed inside the handrail portion 14, and an electric heater 16 is also installed at an appropriate position of the suction port 13. When one of these electric heaters is energized, the other is not energized.
Electricity is applied to the electric heater 15 at the handrail part during business hours, and to the electric heater 16 at the suction port during non-business hours. Therefore, as shown in FIG. 2, each lighting lamp 11 is connected to a ballast 1
7 in parallel, and those lighting lights 1
A magnetic contactor 19 interlocked with the on/off switch 18 of the switch 1 is provided, and the magnetic contactor 19
Either one of the electric heaters 15 or 16 is connected to the power source 20 by the contact piece 19a operated by the electric heater 15 or 16. In addition, as the lighting lamp 11,
For example, a fluorescent lamp is used.

During operation, a cold air curtain is formed in the front opening 2 by the operation of the cooler 6 and the blowers 7 and 9, and the cold air is sucked into the suction port 13 and circulated through the cold air passage 5 and the circulation passage 8. During business hours, each lighting lamp 11 is turned on by the switch 18,
When the switch 18 is in the on position, the electromagnetic contactor 19 causes the contact piece 19a to come into contact with the electric heater 15 of the handrail, thereby connecting the electric heater 15 to the power source 20. Therefore, the handrail portion 14 is heated and kept at an appropriate temperature.
In addition, when the business is not open, the switch 18 is moved to the OFF position to turn off the illumination light 11, and the electromagnetic contactor 19 is actuated to move the contact piece 19a to the electric heater 16 side. 15 is turned off, and the electric heater 16 at the suction port is energized. Therefore,
Even when a night cover is attached to an opening 2, frost does not form.

(Effects of the invention) As described above, according to the invention, if the lighting lamp is turned on during business hours, the electric heater at the handrail is always energized and the electric heater at the inlet is turned off, and when the lamp is not open for business, the electric heater is turned off. When the light is turned off, the electric heater at the handrail is always turned off and the electric heater at the inlet is energized.
There is no operational error, therefore both electric heaters are not energized together, and the suction port is not blocked by frost during non-business hours. Furthermore, the electric heaters in the handrail and inlet are energized only when necessary, which is advantageous in terms of energy conservation.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an example of an open show case according to the present invention, and FIG. 2 is a wiring diagram of the main parts thereof. In the figure, 2...Front opening, 11...Lighting light, 1
3... Suction port, 14... Handrail section, 15, 16...
Electric heater, 19...Magnetic contactor.

Claims (1)

[Scope of utility model registration request] A lighting lamp that illuminates the inside of the refrigerator in an open show case in which the front opening of the show case is covered with a cold air curtain, and electric heaters are installed at the handrail on the front side of the show case and at the inlet of the cold air curtain. When the light is on, the electric heater at the handrail section is energized, and when the light is off, the electric heater at the suction port is energized.These electric heaters are connected to magnetic contactors that are switched on and off when the light is switched on and off. An open case that can be turned on and off.