JPH05237026A - Showcase - Google Patents

Abstract

PURPOSE:To provide a showcase by which electric wiring works can be simplified in installing the showcase. CONSTITUTION:Fluorescent lamps, which can be applied for higher voltage than usual 100V source, are provided in a showcase 1. And extending wires 13 to the adjacent showcase 1 are supplied in the respective showcases 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a showcase that has an electric load such as lighting and is installed in a supermarket or the like.

[0002]

2. Description of the Related Art Conventionally, in this type of showcase, for example, a lighting or cooling fan motor made of a fluorescent lamp as disclosed in Japanese Utility Model Publication No. 2-36076 (F25D27 / 00),
Alternatively, a large number of electric loads such as a heater for preventing dew condensation and control circuits thereof are attached, and these loads are operated by single-phase AC 100V which is a normal commercial power source. In particular, as many as 12 to 21 fluorescent lamps are used for one showcase, which constitute the illumination in the showcase.

Therefore, when the ballast of the fluorescent lamp has a low power factor, a current of 12 A to 21 A is required for each showcase. On the other hand, the circuit breaker for wiring connected to one system of the power supply to this kind of showcase has a limit value of 20A, and in actuality, about 17A is used as the upper limit value of the load current. For the power supply of, the circuit configuration is as shown in FIG.

That is, in FIG. 5, a plurality of showcases 100 are installed in a store such as a supermarket or a convenience store, and each showcase 100 operates with the single-phase AC 100V as a power source and the fluorescent lamps and cooling fans. Equipped with a motor, heater and control circuit. Further, each showcase 100 is provided with a terminal board 102 for supplying power to these electrical loads.

As described above, a current of 12 A to 21 A flows through the terminal board 102 of each conventional showcase 100. Therefore, one from the distribution board for two showcases 100
When power is supplied by a system circuit, the circuit breaker for wiring breaks the circuit due to overcurrent. Therefore,
As described above, conventionally, separate branch circuits 103, 104, 105, and 106 are provided for each showcase 100 from the distribution board, and each branch circuit is connected to the terminal board 102 of each showcase 100.

[0006]

As described above, since the current value flowing through the showcase 1 is large in the related art, each showcase 100 must be fed from the distribution board by a separate system. However, since a plurality of showcases 100 are usually installed side by side in a store, it is necessary to prepare power supply systems for the number of showcases 100 during installation work, which increases installation work costs and electric wiring work. Of time and labor was required.

The present invention has been made to solve the above-mentioned conventional technical problems, and provides a showcase capable of simplifying the electric wiring work at the time of installing the showcase.

[0008]

Showcase 1 of the present invention
Has an electric load (fluorescent lamp) 7, and this load (fluorescent lamp) 7 is a load corresponding to a power source having a voltage higher than the commercial 100 V power source, and the adjacent showcase 1
It is provided with a crossover wiring 13 to.

[0009]

According to the showcase 1 of the present invention, the electric load such as the fluorescent lamp 7 is compatible with a power source having a voltage higher than that of the commercial 100V power source.
A power source such as V can be used. When this power supply voltage rises, the load current decreases in inverse proportion to the amount of voltage rise at the same power consumption. Therefore, it is possible to supply power to a plurality of showcases 1 by one system circuit. In that case, the showcase 1 of the present invention is provided with the crossover wiring 13 to the adjacent showcases 1. So
By using the crossover wiring 13 to electrically connect a plurality of adjacent showcases 1 at the time of electrical work at the installation site, a power source is supplied to the plurality of showcases 1 by one system circuit from the distribution board. Will be able to supply.

[0010]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a diagram for explaining power supply to a plurality of showcases 1 of the present invention, FIG. 2 is an electric circuit diagram of the showcases 1,
FIG. 3 shows vertical side views of the showcase 1, respectively.

In FIG. 3, a showcase 1 includes a cooler 2 to which a refrigerant is supplied from a refrigerating device, and a cooling fan 4 having a single-phase AC 200V power supply for circulating cold air that has exchanged heat with the cooler 2 in a compartment 3. In addition, a plurality of shelves 6 are installed in the interior 3 and a plurality of fluorescent lamps 7 having a single-phase AC 200V power supply are attached to each of the shelves 6 including the ceiling as interior lighting. ing. Wiring 9 for supplying power to each of the electric loads is attached to the showcase 1 by a clip 11, and a terminal board 12 connected to the wiring 9 is provided below the wiring 9.

Further, the showcase 1 is provided with a crossover wiring 13 as shown in FIG. The crossover wiring 13 is provided with terminals 14 that match the terminal board 12 at both ends, and the number of wirings 16 is sufficient for transmission of the number of loads and control, alarms, and the like.
Is formed into a harness by the tape 17.
In addition to this, the crossover wiring 13 may be configured by a so-called captyre cable. If the showcase 1 has a raceway, the crossover wiring 13 is inserted and placed inside the showcase 1. If there is no raceway, the crossover wiring 13 is partially fixed to the wall surface of the showcase 1 so as to be previously attached to the showcase 1. Provide and set.

Next, in FIG. 2, a distribution board (not shown) for supplying a single-phase AC 200V power supply to the showcase 1 includes a pole transformer 19 formed by connecting coils 18, 18 in a so-called V-connection. Power is supplied. The neutral point N of the pole transformer 19 is grounded, and the voltage between the wirings 21 and 22 connected to the coil 18 and the wiring 23 connected to the neutral point N is 100V single-phase AC. Therefore, the safety at the time of electric shock is similar to that of the conventional single-phase AC 100V power supply. Therefore, when connecting the wiring of the load in the showcase 1, the wiring 1 and the wiring 21 and
The 00V loads 24 and 25 are connected.

On the other hand, the voltage between the wirings 21 and 22 is a single-phase AC 200V, so that the fluorescent lamp 7 and a single-phase AC 200V load such as the cooling fan 4 are connected to the fluorescent lamp 7 (here, the fluorescent lamp 7). Only shown). By using 200 V, which is twice the conventional AC 100 V, as the power source, the current value flowing through the fluorescent lamp 7 is 1/2 with the same power consumption.
become. Further, the fluorescent lamp 7 has a power factor increased from 0.55 of the conventional type to 0.95 by doubling the power factor of 0.55 by inserting a phase advancing capacitor or using an inverter type high power factor electronic ballast. .. Since the power factor and the current value are inversely proportional to each other at the same power consumption, the current value becomes ½ by doubling the power factor. The current value flowing through the fluorescent lamp 7 is set to 1/4 of that of the conventional one by combining these.

In this way, the value of the current flowing through the wiring 9 of the showcase 1 is about 1/4 of that of the conventional one, and the current flowing per unit is reduced to 3A to 5A. Therefore, when the same circuit breaker is used, it is possible to connect four showcases 1, which is four times the conventional one, to one system circuit.

Next, the wiring work for installing the showcase 1 of the present invention will be described with reference to FIG. In this case, four showcases 1 are installed side by side in the store.
In the distribution board (not shown) where the output voltage of the pole transformer 19 appears, the showcase 1 closest to it is connected to the circuit 3
Connect by 0. This circuit 30 is connected to the terminal board 12. Next, the crossover wiring 13 of the showcase 1
The terminal 14 at one end of the crossover wiring 13 is connected to the terminal board 12 or preliminarily connected and placed, and the terminal 14 at the other end of the crossover wiring 13 is connected to the terminal board 12 of the showcase 1 on the left side thereof. Furthermore,
The terminal 14 at one end of the crossover wiring 13 of the left adjacent showcase 1 is also connected to the terminal board 12 thereof, and the terminal 14 at the other end is further connected to the terminal board 12 of the left adjacent showcase 1. Similarly, the showcase 1 on the left side is also electrically connected by the crossover wiring 13 to electrically connect all four showcases 1 to the circuit 30 one after another.

As a result, the current of the four showcases 1 for the circuit 30 flows through the circuit 30, but as described above,
Since the current value per unit is 1/4, the total is one, and the circuit breaker does not interrupt the circuit 30. Therefore, it is not necessary to wire a circuit of another system for each showcase 1 at the installation site as in the conventional case, and the electric wiring work is simplified.
In particular, since the crossover wiring 13 for connecting each showcase 1 is also provided in the showcase 1 in advance, the electric wiring work for connecting the four showcases 1 is extremely simplified, and the electric wiring work at the installation site is generally performed. It can be remarkably simplified.

In the embodiment, the terminal board 1 to which it is connected
Although a series of crossover wires 13 are made to extend from 2 to the terminal board 12 of the adjacent showcase 1, the present invention is not limited to this, and the halfway crossover wires 13 are pulled out from each showcase 1 and placed at each end. The terminal 14 etc. may be attached and connected to each other outside the showcase 1.

[0019]

According to the showcase of the present invention, the electric load is compatible with a power source having a voltage higher than that of a commercial 100V power source, and the power source having a high voltage can be used as a power source. The flowing current value can be reduced. Therefore, it is possible to increase the number of showcases that can be connected to one circuit and connect the showcases with the crossover wiring. Further, since the crossover wiring is provided in the showcase in advance, it is possible to simplify the electric wiring work at the time of installing the showcase and reduce the construction cost as a whole.

[Brief description of drawings]

FIG. 1 is a diagram illustrating power supply to a plurality of showcases of the present invention.

FIG. 2 is an electric circuit diagram of the showcase.

FIG. 3 is a vertical sectional side view of the showcase.

FIG. 4 is a plan view of a crossover wiring.

FIG. 5 is a diagram illustrating power supply to a plurality of conventional showcases.

[Explanation of symbols]

 1 Showcase 7 Fluorescent lamp 13 Crossover wiring

Claims (1)

[Claims] 1. A showcase provided with an electric load, wherein the load is a load corresponding to a power source having a voltage higher than a commercial 100V power source, and a crossover wiring to an adjacent showcase is provided. A showcase featuring.