JP2001221548A - Power source controller for cold storage showcase - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power source controller for a cold storage showcase capable of suppressing a temperature rise in the showcase by eliminating heating in an operation by stopping operations of respective type units controlled via a controller in association with a stop of a second power source voltage from a second power source circuit to a compressor and suppressing quality deterioration of a content such as food or the like. SOLUTION: When a breaker 104 is operated due to an overload state of a three-phase 200 V power source circuit 102 to cut off a supply of a three-phase 200 V power source voltage, exciting parts 108 of break relays 108, 113 are simultaneously deenergized, and a relay contact 113 is opened. Accordingly, the supply of a single-phase 100 V power source circuit 101 is also cut off. Therefore, heating due to unnecessary circuit operation at the same time as stopping time of cooling due to the stop of the compressor 106 does not occur. The temperature rise in a showcase body 1A can be suppressed, and quality deterioration of the content such as the food or the like can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a first power supply circuit for supplying a first power supply voltage to a control device for controlling various devices, and a second power supply circuit for supplying a second power supply voltage to a compressor.
More particularly, the present invention relates to a power supply control device that drives a refrigerated showcase by using two different power supply circuits different from each other, and in particular, the supply of a second power supply voltage from a second power supply circuit to a compressor is cut off. In this case, the supply of the first power supply voltage from the first power supply circuit unit to the control device is interlocked with this, thereby suppressing the temperature rise inside the showcase and deteriorating the quality of the contents such as food. The present invention relates to a power supply control device for a refrigerated showcase, which can prevent the occurrence of a power supply.

[0002]

2. Description of the Related Art Conventionally, a refrigerated showcase has a fan motor 107, a heater 109, and a fluorescent lamp 1 as shown in FIG.
11 and a control device 105, and a compressor 106 and the like controlled by the control device 105. Here, the compressor 106 is used to compress the refrigerant gas as a pre-stage of cooling by the heat of vaporization, and the fan motor 107 is used to diffuse the cooled cool air into the showcase body. The heater 109
Is for preventing freezing and defrosting of the cooler, and the fluorescent lamp 111 is provided for the purpose of illuminating the display in the showcase. Further, the compressor 106 is intermittently driven and controlled by the control device 105 in order to maintain the temperature inside the showcase main body at an appropriate temperature.

[0003] Here, since the refrigerated showcase is mainly used for business use, its refrigeration capacity is large, and therefore, a cooling system having high cooling capacity and high cooling efficiency is required. On the other hand, for the control system, it is possible to enjoy advantages such as the reliability and cost of the components if the components are configured with versatile circuit components. Under the circumstances described above, in a refrigerated showcase for business use, usually, a component device that determines the capacity of a cooling system such as the compressor 106 is a three-phase two-phase device.
The control system and the like including the control device 105 are driven by the 00V power supply circuit unit 102, and the single-phase 100V power supply circuit unit 10
A configuration driven by 1 is generally used. FIG. 6 shows a circuit diagram of a power supply control device 200 for a refrigerated showcase having such a configuration. The compressor 106 constituting a cooling system requiring high cooling capacity and cooling efficiency is a three-phase 200 V
And the other components, that is, the control system such as the control device 105, the fan motor 107,
The heater 109, the fluorescent lamp 111, and the like are driven by a single-phase 100V power supply circuit unit 101. This allows
It is possible to cool quickly and efficiently, and to configure a control system and the like with high reliability and low cost.

[0004]

However, the conventional power supply control device 20 for a refrigerated showcase shown in FIG.
0, a single-phase 100V power supply circuit section 101 for supplying a power supply voltage to a control system including the control device 105 and a three-phase 200V for supplying a power supply voltage to a compressor 106 constituting a cooling system.
Although two power supply circuits different from the power supply circuit 102 are used, the power supply circuits 101 and 102 are provided with breakers 103 and 104 for safety, and the power supply circuits 101 and 102 are overloaded. In this case, the supply of the power supply voltage is interrupted.

Therefore, in such a configuration, the three-phase two-phase
When the power supply voltage supplied from the power supply circuit unit 102 of 00V is cut off, the operation of the compressor 106 stops and the cooling system stops. However, the single-phase 100V power supply circuit 10
1, the fan motor 107, the heater 109, and the like continue to operate, and the temperature in the showcase rises due to heat generated by itself or from a component device, and the showcase This is a problem because it adversely affects the quality of the contents such as foods inside. In addition, since the power supply to the fluorescent lamp 111 is continued and the illumination in the showcase is normal, there is a problem that the detection of an abnormally high temperature in the showcase due to the stoppage of the operation of the cooling system is delayed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem of the prior art. When the supply of the second power supply voltage from the second power supply circuit section to the compressor is interrupted, the present invention has been made. In conjunction therewith, the supply of the first power supply voltage from the first power supply circuit unit to the control device is cut off, and the operation of various devices controlled via the control device is stopped to eliminate heat generation associated with the operation, thereby refrigeration show An object of the present invention is to provide a power supply control device for a refrigerated showcase that can suppress a rise in temperature inside a case and minimize deterioration of the quality of contents such as food.

[0007]

In order to achieve the above object, a power supply control device for a refrigerated showcase according to claim 1 supplies a first power supply voltage to a control device for controlling various devices. And a second power supply circuit for supplying at least a second power supply voltage to the compressor.
Stopping means for stopping the supply of the first power supply voltage from the first power supply circuit unit to the control device based on the interruption of the supply of the second power supply voltage from the power supply circuit unit. And

In the power supply control device for a refrigerated showcase according to the first aspect, a first control device for controlling various devices is provided.
A first power supply circuit for supplying a second power supply voltage to at least the compressor, and a second power supply circuit for supplying a second power supply voltage to the compressor. When the supply of the second power supply voltage to the control device is interrupted, the stopping means controls the supply of the first power supply voltage from the first power supply circuit unit to the control device to be stopped.

Thus, even when the supply of the second power supply voltage from the second power supply circuit unit to which the control device is not connected is interrupted and the operation of the compressor or the like is stopped, the first power supply to the control device is stopped. Since the supply of the power supply voltage is stopped, the operation of the various devices is also stopped with the stop of the operation of the control device, and even when the operation of the compressor or the like is stopped, no heat is generated due to the operation of the various devices. Therefore, all devices in the refrigerated showcase
Since the operation is stopped and the heat source disappears, even in the state of the cooling stop due to the stop of the operation of the compressor, the temperature rise inside the refrigerated showcase can be suppressed, and the quality of the contents such as food can be maintained.

When the supply of the first power supply voltage from the first power supply circuit section to which the control device is connected is interrupted, the control device stops operating. Here, the second power supply circuit unit itself operates normally, but the compressor and the like connected to the second power supply circuit unit are controlled by the control device, so the second power supply circuit unit The operation is stopped based on the stop of the operation of the control device without stopping the supply of the second power supply voltage from. Therefore, all devices in the refrigerated showcase stop operating and there is no heat source,
The rise in temperature inside the refrigerated showcase can be suppressed, and the quality of contents such as food can be maintained.

At this time, if control means is provided by a control device or, for example, a notifying means such as an indicator or a lamp for notifying that the supply of the power supply voltage has been cut off is provided, the first or second notifying means may be provided. If the supply of the power supply voltage from any one of the power supply circuit units is interrupted, it is possible to notify the abnormal state.

According to a second aspect of the present invention, in the power supply control apparatus for a refrigerated showcase according to the first aspect, the stopping means includes: a relay provided in the second power supply circuit section; And a relay contact that is provided in the power supply circuit unit and is opened and activated by a relay.

According to a second aspect of the present invention, there is provided a power supply control device for a refrigerated showcase, wherein the first power supply voltage from the first power supply circuit is stopped when the second power supply voltage from the second power supply circuit is cut off. Controls to open a relay contact provided in the first power supply circuit via a relay provided in the second power supply circuit.

With this, the supply of the second power supply voltage from the second power supply circuit section is always detected with a simple circuit configuration,
When the supply of the second power supply voltage from the power supply circuit unit is interrupted, the supply path of the first power supply voltage from the first power supply circuit unit can be opened immediately, It is possible to quickly respond to an abnormal state in the supply of the second power supply voltage from the circuit unit.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a power supply control device for a refrigerated showcase according to the present invention will be described in detail with reference to FIGS. FIG.
FIG. 3 is a circuit diagram showing a power supply control device of a refrigerated showcase. FIG. 2 is a front view of the refrigerated showcase of the present embodiment. FIG. 3 is a left side view of the refrigerated showcase. FIG. 4 is a cross-sectional view showing a first specific example showing a state of assembling substrates in a control box of a refrigerated showcase. FIG. 5 is a cross-sectional view showing a second specific example showing a state of assembling the boards in the control box of the refrigerated showcase.

Referring to FIG. 2, a schematic configuration of the refrigerated showcase 1 will be described. The showcase main body 1A is a box formed of an interior plate 3 and an exterior plate 5 filled with a foam heat insulating material 7 such as urethane, and is mounted on a base 31. An opening 9 is provided on the front surface of the showcase main body 1, and an upper end 9A and a lower end 9 of the opening 9 are provided.
An upper guide rail 11 and a lower guide rail 13 are attached to B, respectively. These two guide rails 1
A pair of sliding doors 15 and 17 are provided on the guide rails 1 and 13, respectively.
They are slidably fitted along 1 and 13.

The sliding doors 15 and 17 are fitted with transparent glasses 23 and 25 via door frames 19 and 21, respectively, through which the foods and the like stored in the showcase body 1A are inserted. The contents can be seen through. Also, at the left and right ends of the sliding doors 15 and 17,
The handle members 27 and 29 are formed by extrusion molding, and these handle members 27 and 29 are used for opening and closing the sliding doors 15 and 17 with fingers when opening and closing the sliding doors 15 and 17.

Next, the main components of the refrigerated showcase 1 will be described. The compressor 106, the condenser 35, and the control box 39 are housed below the base 31. Compressor 10
The condenser 6 and the condenser 35 constitute a cooling cycle in the cooling system of the refrigerated showcase 1 together with a cooler 37 described later.
After the high-pressure gas, the refrigerant is liquefied while radiating heat in the condenser 35 and sent to the cooler 37. And the cooler 37
Then, the cooling cycle is completed by removing the heat of vaporization from the atmosphere in the showcase body 1A by vaporizing again. The compressor 106 is positioned at the beginning of this cycle, and since the cooling capacity is determined by the degree of compression of the refrigerant gas in the compressor 106, the compression capacity of the compressor 106 is preferably large. For this reason, in the refrigerated showcase 1 for business use, a three-phase 200V power supply circuit unit 102 (see FIG. 1) is generally used as a drive power supply for the compressor 106.

The control box 39 houses a control device 105 for controlling the temperature inside the refrigerated showcase body 1A. The control device 105 includes a control board 100A (see FIG. 4) and a control board 100B (see FIG. 5) on which a microcomputer or the like for performing temperature control is mounted, as well as operations for various operations such as temperature display and setting temperature change. And a relay board (not shown).
, The compressor 106 is driven intermittently to adjust the temperature inside the showcase body 1A to the set temperature.
The control device 105 is generally constituted by circuit components having a single-phase 100 V as a power supply voltage, since it is possible to enjoy advantages such as reliability and cost of the components if the control device 105 is constituted by versatile circuit components. ing.

As shown in FIG. 4 and FIG.
Reference numeral 1 denotes a two-layer structure in which the control box 39 is disposed on the front surface of the control box 39 for various operations such as checking a temperature display and changing a set temperature, and the control board 100A or 100B is provided behind the control box 39. Then, the operation substrate 201 and the control substrate 10
The dimension of the short side of the control board 100A (the vertical dimension in FIG. 4) so that the operation board 201 can be fixed to the control box 39 by the screw 204 even after the 0A or 100B is fixed. ) Is formed shorter than the operation substrate 201 (see FIG. 4), or the control substrate 100
Notch 2 at the position corresponding to the screw 204 mounting position of B
09 is provided (see FIG. 5). Thus, the operation substrate 201 and the control substrate 100A or 100B are fixed in advance, and each substrate can be fixed to the control box 39 in a state where the two substrates are integrated, so that the assembly process is simplified. It is possible to minimize damage to the substrate due to assembly.

In the vicinity of the various operation switches 208 arranged on the operation board 201, the operation board 201
Is provided with a through hole 210, a screw fixing portion 206 extending from the control box 39 is inserted into the through hole 210, and the control board 100
A or 100B is fixed via a screw 205.

Further, a substrate fixing member 207 is disposed near the screw fixing portion 206 to support the operation substrate 201. Accordingly, even when the various operation switches 208 such as a push button switch are operated, the operation substrate 201 does not bend, the switch operation is ensured, and the operation feeling is good.

Next, as shown in FIG. 3, a cooler 37 is mounted on the top of the refrigerated showcase main body 1A, and a fan motor 107 is mounted adjacent to the cooler 37. The convection of the atmosphere is generated in the showcase body 1A by the air blown from the fan motor 107, and
7 is circulated in the showcase body 1A. The cooler 37 has a heater 109 (FIG. 1).
) Is placed, and is electrically heated as necessary to prevent freezing and defrosting of the cooler. As for these various devices, since it is possible to enjoy advantages such as reliability and cost of the components if they are constituted by versatile circuit components, they are constituted by circuit components using a single-phase 100V as a power supply voltage. I have.

Further, on the back of the showcase body 1A,
A fluorescent lamp 111 is placed on the inside of the showcase body 1A so that the contents such as food stored in the showcase body 1A can be seen well through the transparent glass 23, 25 of the sliding doors 15 and 17. Is to illuminate. still,
The lighting device of the fluorescent lamp 111 is generally configured by circuit components using a single-phase 100 V as a power supply voltage.

Next, the power supply control device 100 of the refrigerated showcase 1 in this embodiment will be described with reference to FIG. In the refrigerated showcase 1 of the present embodiment, as described above, the single-phase 100V power supply circuit unit 101 and the three-phase 200V
V power supply circuit section 102 and two power supply circuit sections. Each of the power supply circuit units 101 and 102 has a breaker 103 and 104 for ensuring the safety of the constituent devices.
Are provided, and when each of the power supply circuit units 101 and 102 is overloaded, the corresponding breakers 103 and 104 are provided.
Operate to cut off the supply of the power supply voltage. The breaker 1 is connected to the single-phase 100V power supply circuit unit 101.
03 through the control device 105 and the fan motor 10
7, the heater 109 and the fluorescent lamp 111 are connected,
Further, on the power supply voltage path, a relay contact 113 of a so-called break relay having a contact that closes in a return state and opens in an operation state is inserted. The compressor 106 described above is connected to the three-phase 200V power supply circuit 102 via a breaker 104, and the excitation unit 108 of the break relay is inserted between the power supply voltages.

The relay contact 113 and the exciting section 108 are combined to form a break relay, and a single-phase 100 V
Is a three-phase 200V power supply circuit 102.
Associated with. That is, when the three-phase 200V power supply circuit unit 102 is operating normally, the breaker 1
04 is not activated, so that a three-phase 200 V power supply voltage is applied to the compressor 106 and the exciting unit 108 of the break relay. Therefore, the compressor 106 operates normally, the inside of the showcase body 1A is cooled to an appropriate temperature, and the exciting unit 108 of the break relay is also excited, so that the relay contact 113 keeps the circuit closed. Therefore, single-phase 100V
The power supply circuit section 101 also maintains normal operation,
Is applied to the control device 105, the fan motor 107, the heater 109, and the fluorescent lamp 111 to maintain the normal operation. Therefore, in this case, all the constituent devices of the showcase 1 maintain the normal operation.

Next, the three-phase 200V power supply circuit section 102 is overloaded, and the breaker 104 operates to activate the three-phase 200V.
When the supply of the power supply voltage of 00V is interrupted, the compressor 10
6 stops its operation, and the inside of the showcase body 1A cannot be cooled. However, at the same time, the excitation of the excitation unit 108 of the break relay is also released.
3 opens. Therefore, the single-phase 100V power supply circuit unit 10
1 is also cut off and the single-phase 100V power supply voltage is
5. Fan motor 107, heater 109 and fluorescent lamp 11
1 will no longer be applied and these components will also stop operating. As a result, heat generation due to unnecessary circuit operation is eliminated, temperature rise in the showcase main body 1A can be suppressed, and quality deterioration of contents such as food can be prevented. Can be promptly notified that an abnormality has occurred.

Conversely, the single-phase 100V power supply circuit section 101 is overloaded, and the breaker 103 operates to operate the single-phase 100V.
When the supply of the power supply voltage of 00V is interrupted, the control device 1
05, fan motor 107, heater 109 and fluorescent lamp 1
No power supply voltage is applied to the power supply 11 and these components stop operating. Convection of the cool air by the fan motor 107 becomes impossible, and the cooler 3
7, the control device 105 also stops operating at the same time, and the compressor 106 controlled by the control device 105 also stops operating. Without a freezing or the like, a rapid temperature change in the showcase body 1A can be suppressed, and the deterioration of the quality of contents such as food can be prevented. Further, since the fluorescent lamp 111 is also turned off, it is possible to promptly notify that an abnormality has occurred in the constituent devices.

As described in detail above, in the power supply control device 100 of the refrigerated showcase 1 according to the present embodiment, a single-phase 100 V power supply circuit 101, 102 is provided with breakers 103, 104 for safety. And the three-phase 200V power supply circuit 102
The control device 105, the fan motor 107, the heater 109, and the fluorescent lamp 111 are connected to the single-phase 100V power supply circuit 101 via the breaker 103, and the three-phase 200V power supply A compressor 106 is connected to the circuit section 102 via a breaker 104. Further, when the power supply of the three-phase 200V power supply circuit unit 102 is cut off between the two power supply circuit units 101 and 102 by the break relays 108 and 113, the single-phase 10
It is associated so that the power supply of 0 V is cut off. Therefore, when the three-phase 200V power supply circuit 102 is operating normally, the breaker 104 is not activated and the relay contact 113 keeps the circuit closed, so that the single-phase 100V power supply circuit 101 also operates normally. All components of the showcase 1 can maintain normal operation.

Further, the breaker 104 operates due to the overload state of the three-phase 200V power supply circuit 102, and the three-phase 200V
When the supply of the power supply voltage of 0 V is cut off, the excitation parts 108 of the break relays 108 and 113 are simultaneously released, and the relay contact 113 is opened, so that the supply of the power supply voltage of the single-phase 100 V power supply circuit part 101 is also cut off. . Accordingly, heat generation due to unnecessary circuit operation is not caused at the same time as the cooling stop accompanying the stop of the compressor 106, and the temperature rise in the showcase main body 1A can be suppressed, and the deterioration of the quality of contents such as food can be prevented. Since the fluorescent lamp 111 is turned off, it is possible to promptly notify that an abnormality has occurred in the constituent devices.

Conversely, the breaker 103 operates due to the overload state of the single-phase 100V power supply circuit 101, and the single-phase 100V
When the power supply of 0 V is cut off, the control device 10
5 stops operating. Since the compressor 106 has no control signal, the operation of the compressor 106 is automatically stopped without opening the power supply voltage path from the three-phase 200V power supply circuit section 102 by a relay contact, and there is no need to provide a separate relay. Then, only the cooling system does not continue to operate, so that local overcooling and freezing of the cooler 37 can be prevented, rapid temperature changes in the showcase body 1A can be suppressed, and the quality of contents such as foods can be improved. Deterioration can be prevented. Further, since the fluorescent lamp 111 is also turned off, it is possible to promptly notify that an abnormality has occurred in the constituent devices.

The present invention is not limited to the above-described embodiment, and it goes without saying that various improvements and modifications can be made without departing from the spirit of the present invention. For example, in the present embodiment, when the three-phase 200V power supply voltage is cut off, the single-phase 100V power supply voltage path is opened using the break relays 108 and 113, and the single-phase 100V
When the power supply voltage is cut off, the operation of the control device 105 is stopped to stop the operation of the compressor 106 connected to the three-phase 200V. However, the present invention is not limited to this configuration. May be installed on both sides so that the other power supply voltage path is opened even if either power supply voltage is cut off.

In this embodiment, an electromagnetic relay has been described as an example of a break relay. However, the circuit to be used is not limited to this, and a configuration using a semiconductor device such as a power transistor or a phototransistor can be used. It can also be.

[0034]

According to the present invention, when the supply of the second power supply voltage from the second power supply circuit section to the compressor is interrupted, the first power supply circuit section for the control device is operated in conjunction therewith. The supply of the first power supply voltage from the control unit, and stop the operation of various devices controlled through the control device to eliminate the heat generated by the operation, thereby suppressing the temperature rise in the refrigerated showcase, Deterioration of the quality of the contents can be minimized.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a power supply control device of a refrigerated showcase.

FIG. 2 is a front view of the refrigerated showcase of the embodiment.

FIG. 3 is a left side view of the refrigerated showcase.

FIG. 4 is a cross-sectional view showing a first specific example showing a state of assembling substrates in a control box of a refrigerated showcase.

FIG. 5 is a cross-sectional view showing a second specific example showing a state of assembling substrates in a control box of the refrigerated showcase.

FIG. 6 is a circuit diagram showing a conventional power supply control device for a refrigerated showcase.

[Explanation of symbols]

1. Refrigerated showcase, 1A ... Showcase body, 39
... Control box, 101 ... Single-phase 100V power supply circuit section, 102
... three-phase 200V power supply circuit section, 103, 104 ... breaker, 105 ... control device, 106 ... compressor, 107 ... fan motor, 108 ... exciting section, 109 ... heater, 111
... Fluorescent lamp, 113 ... Relay contact

Claims (2)

[Claims] 1. A first power supply circuit for supplying a first power supply voltage to a control device for controlling various devices, and a second power supply circuit for supplying at least a second power supply voltage to a compressor. A refrigerated showcase comprising: a first power supply circuit from the first power supply circuit unit to the control device based on a supply of a second power supply voltage from the second power supply circuit unit to the compressor being cut off; A power supply control device for a refrigerated showcase, comprising a stopping means for stopping supply of the power supply voltage. 2. The stopping means comprises: a relay provided in the second power supply circuit; and a relay contact provided in the first power supply circuit and operated and opened via the relay. The power supply control device for a refrigerated showcase according to claim 1, wherein: