JP2010249346A - Showcase - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a showcase accurately and efficiently controlling a temperature of displayed commodity even if there is a thermal influence due to increase and decrease of commodity from other than a surrounding in commodity displaying or the like. <P>SOLUTION: In the showcase A, a refrigerant circuit is composed by connecting a compressor 1, a radiator 2, a throttling device 3, and an evaporator 4 by piping, and it is equipped with a storage chamber 10 carrying out cooling by using heat absorption in the evaporator. It is composed by equipping a quick cooling switch 22 issuing a command of increasing a rotational frequency of the compressor, a weak cooling switch 23 issuing a command of reducing the rotational frequency of the compressor, and a controller 6 increasing a compressor capacity for a certain time by increasing the rotational frequency of the compressor based on the command of increasing the rotational frequency of the compressor from the quick cooling switch, and reducing the compressor capacity for a certain time by reducing the rotational frequency of the compressor based on the command of reducing the rotational frequency of the compressor from the weak cooling switch. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a showcase installed in a store such as a supermarket or a convenience store.

  Conventionally, stores such as supermarkets and convenience stores have been installed with refrigerated or frozen showcases to display and sell products such as refrigerated and frozen foods. In addition, since this showcase is affected by heat from the surroundings, a technique for changing the set value of the internal temperature in accordance with the ambient temperature has also been proposed (see Patent Document 1).

Japanese Patent Laying-Open No. 2005-106403 (first page, FIG. 1)

In conventional showcases, capacity control is performed using the temperature of the air blown into the storage room as the internal temperature, and the set value of the internal temperature is corrected in accordance with the thermal influence from the surroundings to properly cool the product. It was.
However, when there is a thermal effect due to, for example, an increase or decrease in the product other than the surroundings when the product is displayed, the set value of the internal temperature considering the thermal effect is not corrected, and the product cannot be cooled properly. It was.

  The present invention has been made in order to solve such problems, and accurately and efficiently controls the temperature of displayed products even when there is a thermal effect due to an increase or decrease in products at the time of product display. The aim is to get a showcase that can be done.

  The showcase of the present invention is a show comprising a storage chamber in which a compressor, a radiator, a throttle device, and an evaporator are connected by piping to form a refrigerant circuit, and cooling is performed by using heat absorption in the evaporator. A quick cooling switch that issues a command to increase the rotational speed of the compressor, a weak cooling switch that issues a command to reduce the rotational speed of the compressor, and the rotational speed of the compressor from the quick cooling switch. The compressor is accelerated based on a command to increase the compressor capacity for a certain period of time based on a command to increase the speed of the compressor, to increase the compressor capacity for a certain period of time, and to reduce the rotational speed of the compressor from the weak cooling switch. And a control device that controls to reduce the compressor capacity for a certain period of time by reducing the rotational speed of the compressor.

  In the showcase of the present invention, when the number of commodities to be displayed increases, the control device compresses the compressor by increasing the rotational speed of the compressor based on a command to increase the rotational speed of the compressor from the rapid cooling switch. Since the capacity is controlled to increase for a certain period of time, it is possible to cool the products appropriately by suppressing the temperature rise due to the additional display of products in the storage room, and when the number of products to be displayed decreases, compression from the weak cooling switch Based on the command to reduce the machine speed, the compressor speed is controlled to reduce the compressor capacity for a certain period of time. Even if there is a heat effect due to the increase or decrease of products from outside the product display etc., the temperature of the product can be accurately and accurately There is an effect that it is possible to rate controlled.

The schematic diagram which shows the showcase of Embodiment 1 of this invention. The control circuit diagram of the refrigerating cycle of the showcase. The schematic diagram which shows the showcase of Embodiment 2 of this invention. The control circuit diagram of the refrigerating cycle of the showcase. The schematic diagram which shows the showcase of Embodiment 3 of this invention. The control circuit diagram of the refrigerating cycle of the showcase. The control circuit diagram of the refrigerating cycle of the showcase of Embodiment 4 of this invention.

Embodiment 1 FIG.
FIG. 1 is a schematic diagram showing a showcase according to Embodiment 1 of the present invention, and FIG. 2 is a control circuit diagram of a refrigeration cycle of the showcase.
As shown in FIG. 1, the showcase A of the inverter with a built-in refrigerator according to the first embodiment is a vertical open showcase, and is attached to a heat insulating wall 7 having a substantially U-shaped cross section and both sides of the heat insulating wall 7. It is comprised from the side plate (not shown).
An inner layer partition plate 8 is attached to the inner side of the heat insulating wall 7 with a gap therebetween, and an inner layer duct 9 is formed between the heat insulating wall 7 and the inner layer partition plate 8. The inside of the inner layer partition plate 8 is a storage chamber 10 that is inside the cabinet.

  In this storage room 10, four-tier shelves 11 for product display are installed, and fluorescent lamps 12 for illumination are respectively attached to the front part of the lower surface of each shelf 11 and the ceiling part 10 a of the storage room 10. Yes. A bottom duct 13 communicating with the inner layer duct 9 is provided below the bottom of the storage chamber 10. In the bottom duct 13, an internal fan 14 is installed. In addition, an evaporator 4 is provided vertically at a lower portion in the inner layer duct 9 located behind the storage chamber 10.

A discharge port 16 is provided at the upper edge of the front opening 15 of the storage chamber 10, and a suction port 17 is formed at the lower edge of the opening 15 and communicates with the bottom duct 13.
On the other hand, a bottom partition plate 18 is attached to the lower side of the bottom duct 13, and a lower side of the bottom partition plate 18 is a machine room 19.
In the machine room 19, a compressor 1, a radiator 2, a throttle device 3, a heat dissipation fan 5, and a control device 6 are installed.
In addition, an operation panel 21 for user operation is attached to the outside of the basket 20 provided on the upper portion of the heat insulating wall 7. In the operation panel 21, when the thermal load in the storage chamber 10 increases, for example, when the user additionally displays goods, the rapid cooling switch 22 that can perform rapid cooling and the thermal load in the storage chamber 10 decrease. In some cases, for example, a weak cooling switch 23 that can reduce the cooling capacity when the user decreases the number of products is provided.

The compressor 1, the radiator 2, the expansion device 3, and the evaporator 4 on the upper part of the bottom partition plate 18 are sequentially connected by piping, and the refrigerant circulates in the piping. The refrigerant discharged from the compressor 1 dissipates heat to the outside air blown by the heat dissipating blower 5 in the heat dissipator 2 and is cooled, depressurized by the expansion device 3, evaporates by the evaporator 4 and returns to the compressor 1 again. Thus, the refrigeration cycle of showcase A is formed.
As shown in FIG. 2, a quick cooling switch 22 and a weak cooling switch 23 provided on the operation panel 21 are connected to the control device 6, and the control device 6 is connected to the rotational speed of the compressor 1 and the internal blower 14. Control the number of revolutions.

Next, the operation of the showcase A according to Embodiment 1 of the present invention will be described.
When the internal blower 14 is operated, the air in the bottom duct 13 is blown out toward the rear inner duct 9 and is blown up after exchanging heat with the evaporator 4 and is discharged from the discharge port 16 at the upper edge of the opening 15. The air is blown out toward the suction port 17 at the lower edge.

As a result, a cold air curtain is formed in the opening 15 of the storage chamber 10, and intrusion of outside air from the opening 15 is prevented or suppressed, and a part of the cold air curtain circulates in the storage chamber 10. The inside of the storage chamber 10 is cooled. When the store is closed, the opening 15 is closed with a night cover (not shown).
And these cold air etc. return to the bottom duct 13 from the suction inlet 17, and are suck | inhaled again by the air blower 14 for warehouse.
During the operation of the showcase A, frost adheres to the evaporator 4 and the air volume of the internal blower 14 decreases, so that cooling in the storage chamber 10 is hindered. Therefore, the compressor 1 is stopped, and the defrosting operation in which the internal blower 14 is rotated for about 20 to 30 minutes to melt frost with the outside air is performed at predetermined time intervals.

In addition, when the heat load in the storage room 10 increases during the operation of the showcase A, for example, when the user performs an additional display in which the user increases the product by about 10% with respect to the current product amount, the user quickly cools. When the switch 22 is turned on, the control device 6 that has received the ON signal of the rapid cooling switch 22 increases the rotational speed of the compressor 1 to increase the capacity of the compressor 1 for about 5 to 10 minutes. Increase about 20-30%.
Thereby, the temperature rise by the goods additional display in the storage chamber 10 is suppressed, and it becomes possible to cool goods appropriately.
Further, the control device 6 increases the rotation speed of the compressor 1 and at the same time increases the rotation speed of the internal blower 14 to prevent a decrease in the evaporation temperature of the refrigerant. Thereby, since the amount of frost formation of the evaporator 4 reduces, the compressor 1 can be stopped and the defrost operation time which cannot be cooled can be shortened, the temperature rise in the store room 10 is suppressed, and the effect which cools goods appropriately Can be improved.

Further, when the thermal load in the storage chamber 10 decreases, for example, when the user reduces the product by about 10% of the current product amount, the user turns on the weak cooling switch 23 to weaken the product. The control device 6 that has received the ON signal of the cooling switch 23 decelerates the rotational speed of the compressor 1 to reduce the capacity of the compressor 1 by about 20 to 30% from the current state for about 5 to 10 minutes.
Thereby, the temperature drop due to the decrease in the product in the storage chamber 10 can be suppressed, the product can be appropriately cooled, the energy saving effect can be obtained from the deceleration of the compressor 1, and in the case of a refrigerated product such as a beverage, it is frozen. Can be prevented.

  In the first embodiment, when the fluctuation amount of the thermal load in the storage chamber 10, that is, when the amount of addition or reduction of the product is constant, the operation time of the rapid cooling operation or the weak cooling operation is also a predetermined predetermined time. If the user can set the operation time of the rapid cooling operation or the weak cooling operation in accordance with the fluctuation amount of the thermal load, that is, the amount of addition or reduction of the product, the product can be cooled more appropriately.

Embodiment 2. FIG.
FIG. 3 is a schematic diagram showing a showcase according to Embodiment 2 of the present invention, and FIG. 4 is a control circuit diagram of the refrigeration cycle of the showcase.
In the second embodiment, instead of the quick cooling switch 22 and the weak cooling switch 23 of the first embodiment, weight sensors 24 are installed on the upper surface of each of the four shelves 11 for displaying goods in the storage room 10, respectively. A change in the thermal load in the storage chamber 10 is detected by measuring the weight of the product.
In the configuration of the second embodiment, the same configurations as those of the first embodiment are denoted by the same reference numerals, and the description of the overlapping configurations is omitted.

Rapid cooling is performed when the thermal load in the storage chamber 10 increases, that is, when the user additionally displays a product and the product weight measured by the weight sensor 24 increases by about 10% with respect to the current product weight. Carry out driving.
That is, when each weight sensor 24 measures and the total product weight increases by about 10% with respect to the total current product weight of each shelf 11, the measurement value of the product weight measured by each weight sensor 24 is received. The controller 6 increases the rotation speed of the compressor 1 to increase the capacity of the compressor 1 by about 20 to 30% from the current state for about 5 to 10 minutes.
Thereby, the temperature rise by the goods additional display in the storage chamber 10 is suppressed, and it becomes possible to cool goods appropriately.

Further, as in the first embodiment, the rotational speed of the compressor 1 is increased, and at the same time, the rotational speed of the internal fan 14 is increased to prevent a decrease in the evaporation temperature of the refrigerant.
Thereby, since the amount of frost formation of the evaporator 4 can be reduced and the defrosting operation time that cannot be cooled by stopping the compressor 1 can be shortened, the temperature rise in the storage chamber 10 can be suppressed and the product can be appropriately cooled. Can be improved.

Further, when the heat load in the storage chamber 10 decreases, that is, when the user decreases the product and the product weight measured by the weight sensor 24 is reduced by about 10% with respect to the current product weight, the cooling capacity is reduced. Perform weak cooling operation.
That is, when each weight sensor 24 measures and the total product weight is reduced by about 10% with respect to the total current product weight of each shelf 11, the measurement value of the product weight measured by each weight sensor 24 is received. The controller 6 reduces the rotational speed of the compressor 1 to reduce the capacity of the compressor 1 by about 20 to 30% from the current state for about 5 to 10 minutes.
Thereby, the temperature drop due to the decrease in the product in the storage chamber 10 can be suppressed, the product can be appropriately cooled, the energy saving effect can be obtained from the deceleration of the compressor 1, and in the case of a refrigerated product such as a beverage, it is frozen. Can be prevented.

In the second embodiment, when the fluctuation amount of the heat load in the storage chamber 10, that is, the increase or decrease in the weight of the product is constant, the operation time of the rapid cooling operation or the weak cooling operation is also a predetermined predetermined time. However, if the operating time of the rapid cooling operation or the weak cooling operation or the amount of change in the compressor capacity is changed according to the fluctuation amount of the heat load, that is, the increase or decrease of the product weight, the product can be cooled more appropriately. Is possible.
In the second embodiment, the weight sensor 24 is provided on each shelf 11, but it goes without saying that one weight sensor 24 for measuring the load applied to the bottom surface of the storage chamber 10 may be provided. .

There may be an operation panel 21 for user operation, and the operation panel 21 may be provided with a product setting switch that allows the user to set the type of product to be additionally displayed or reduced.
Such product setting switches include a drink switch, a meat switch, a fresh fish switch, and the like.
More appropriate product cooling is possible by changing the operating time of rapid cooling operation or weak cooling operation or the amount of change in compressor capacity according to the product of specific heat and change weight of the product set by the product setting switch It becomes.

Embodiment 3 FIG.
FIG. 5 is a schematic diagram showing a showcase according to Embodiment 3 of the present invention, and FIG. 6 is a control circuit diagram of a refrigeration cycle of the showcase.
In the third embodiment, instead of the quick cooling switch 22 or the weak cooling switch 23 of the first embodiment, the radiation temperature sensor 25 is provided on the ceiling portion 10a of the storage chamber 10 and the bottom surface of each of the three shelves 11 from the top. It is installed and the thermal load change in the storage chamber 10 is detected by measuring the product surface temperature.
In the configuration of the third embodiment, the same configuration as that of the first embodiment is denoted by the same reference numeral, and the description of the overlapping configuration is omitted.
Here, the radiation temperature sensor 25 refers to a sensor that measures the temperature of an object by measuring the temperature of infrared rays emitted from the object.

When the thermal load in the storage chamber 10 increases, that is, the user additionally displays the product and the product surface temperature measured by the radiation temperature sensor 25 rises by 2 to 3 ° C with respect to the set internal temperature of about 5 ° C, for example. In such a case, a rapid cooling operation is performed to perform rapid cooling.
That is, when the average value of the product surface temperature measured by each radiation temperature sensor 24 rises by 2 to 3 ° C. with respect to the set internal temperature, the control device that receives the temperature measurement value measured by each radiation temperature sensor 25 6 increases the rotational speed of the compressor 1 to increase the capacity of the compressor 1 by about 20 to 30% from the current state for about 5 to 10 minutes.
Thereby, the temperature rise by the goods additional display in the storage chamber 10 is suppressed, and it becomes possible to cool goods appropriately.

Similarly to the first and second embodiments, if the rotation speed of the compressor 1 is increased and at the same time the rotation speed of the internal blower 14 is increased, a decrease in the evaporation temperature of the refrigerant is prevented. be able to.
Thereby, since the amount of frost formation of the evaporator 4 can be reduced and the defrosting operation time that cannot be cooled by stopping the compressor 1 can be shortened, the temperature rise in the storage chamber 10 can be suppressed and the product can be appropriately cooled. It can be improved.

Moreover, when the thermal load in the storage chamber 10 decreases, that is, the user decreases the product, the average value of the product surface temperature measured by each radiation temperature sensor 25 is reduced by 2 to 3 ° C. with respect to the set internal temperature. In some cases, a weak cooling operation is performed to reduce the cooling capacity.
In the weak cooling operation, the compressor 1 capacity is reduced by about 20 to 30% from the current state for about 5 to 10 minutes by decelerating the rotation speed of the compressor 1.
Thereby, the temperature drop due to the decrease in the product in the storage chamber 10 can be suppressed, the product can be appropriately cooled, the energy saving effect can be obtained from the deceleration of the compressor 1, and in the case of a refrigerated product such as a beverage, it is frozen. Can be prevented.

  In the third embodiment, when the fluctuation amount of the heat load in the storage chamber 10, that is, the amount of increase or decrease in the product surface temperature is constant, the operation time of the rapid cooling operation or the weak cooling operation is also a predetermined predetermined time. However, if the operating time of the rapid cooling operation or the weak cooling operation or the amount of change in the compressor capacity is changed according to the fluctuation amount of the heat load, that is, the rise or fall of the product surface temperature, the product can be cooled more appropriately. It becomes possible.

The radiation temperature sensor 25 is installed on the ceiling portion 10a of the storage room 10 and the bottom surface of each shelf 11 in three stages from the top, and the rapid cooling operation or the weakness is performed according to the temperature change measured by each radiation temperature sensor 25. If the operation time of the cooling operation or the amount of change in the compressor capacity is changed, more appropriate product cooling can be performed.
In the third embodiment, the radiation temperature sensor 25 is installed on the ceiling portion 10a of the storage chamber 10 and the bottom surface of each of the three shelves 11 from the top, so that the entire product in the storage chamber 10 can be measured. Alternatively, one radiation temperature sensor 25 may be installed in the upper part of the storage chamber 10.

There may be an operation panel 21 for user operation, and the operation panel 21 may be provided with a product setting switch that allows the user to set the type of product to be additionally displayed or reduced.
Such product setting switches include a drink switch, a meat switch, a fresh fish switch, and the like.
If the product surface temperature is corrected according to the emissivity of the product set by the product setting switch, and the operating time of rapid cooling operation or weak cooling operation or the amount of change in compressor capacity is changed, the more suitable product Cooling is possible.

Embodiment 4 FIG.
FIG. 7 is a control circuit diagram of the refrigeration cycle of the showcase according to Embodiment 4 of the present invention.
In the fourth embodiment, instead of the quick cooling switch 22 and the weak cooling switch 23 of the first embodiment, a fluorescent lamp on switch 26 of the fluorescent lamp 12 that illuminates the operation panel 21 and a fluorescent lamp off switch 27 are provided. It is installed.
Since the configuration of the fourth embodiment other than the above is the same as that of the first embodiment, a diagram showing the configuration of the showcase is omitted.
In the normal operation of the showcase A, the fluorescent lamp 12 is turned on by operating the fluorescent lamp on switch 26, and when the store is closed, the fluorescent lamp 12 is turned off by operating the fluorescent lamp off switch 27. ing.

When the fluorescent lamp on switch 26 is operated, the fluorescent lamp 12 is turned on, and the heat load in the storage chamber 10 is increased as compared with the case where the fluorescent lamp 12 is turned off, so that the capacity of the compressor 1 is increased. The deviation between the temperature in the storage chamber 10 and the set temperature is suppressed.
In addition, when the fluorescent lamp off switch 27 is operated, the fluorescent lamp 12 is turned off, and the heat load in the storage chamber 10 is reduced as compared with the case where the fluorescent lamp 12 is turned on. Decreasing the difference between the temperature in the storage chamber 10 and the set temperature is suppressed.

  If either the fluorescent lamp on switch 26 or the fluorescent lamp off switch 27 is operated and the compressor capacity is changed, the temperature in the storage chamber 10 and the set temperature due to the heat load of the fluorescent lamp 12 during the operation. And the product can be cooled appropriately.

  A showcase, 1 compressor, 2 radiator, 3 expansion device, 4 evaporator, 5 fan for heat dissipation, 6 control device, 7 heat insulation wall, 8 inner layer partition plate, 9 inner layer duct, 10 storage room, 10a ceiling part, DESCRIPTION OF SYMBOLS 11 Shelf, 12 Fluorescent lamp, 13 Bottom duct, 14 Fan in a warehouse, 15 Opening part, 16 Discharge port, 17 Suction port, 18 Bottom part partition plate, 19 Machine room, 20kg, 21 Operation panel, 22 Quick cooling switch, 23 Weak cooling switch.

Claims (11)

In a showcase having a storage chamber in which a compressor, a radiator, a throttle device, and an evaporator are connected by piping to constitute a refrigerant circuit, and cooling is performed using heat absorption in the evaporator,
A rapid cooling switch for issuing a command to increase the rotational speed of the compressor;
A weak cooling switch that issues a command to decelerate the rotational speed of the compressor;
Based on a command to increase the rotational speed of the compressor from the rapid cooling switch, the rotational speed of the compressor is increased to increase the compressor capacity for a certain time, and the compressor from the weak cooling switch is increased. A showcase, comprising: a control device that controls to reduce a compressor capacity by decelerating the compressor speed by decelerating the compressor speed based on a command to reduce the engine speed. A fan for the inside that blows air toward the evaporator,
The controller increases the compressor speed by increasing the compressor speed based on a command from the quick cooling switch to increase the compressor speed, and increases the compressor capacity for a certain period of time. The showcase according to claim 1, wherein the rotational speed is increased. In a showcase having a storage chamber in which a compressor, a radiator, a throttle device, and an evaporator are connected by piping to constitute a refrigerant circuit, and cooling is performed using heat absorption in the evaporator,
Commodity display detection means for detecting changes in increase and decrease in goods displayed in the storage room;
A controller for controlling to increase or decrease the compressor capacity for a certain period of time by increasing or decreasing the rotational speed of the compressor in accordance with a change in increase or decrease in the product detected by the product display detection unit; Showcase that features.   4. The show according to claim 3, wherein the merchandise display detection means is a weight sensor that measures a change in increase or decrease in merchandise displayed in the storage room as a change in a load applied to a bottom surface of the storage room. Case.   The showcase according to claim 4, wherein the weight sensor is provided on a bottom surface of the storage room or on each shelf of the storage room. It has a product setting switch that sets the type of product to be cooled,
The controller determines a change amount of the compressor capacity or / and an operation time in which the compressor capacity is changed according to a product of a specific heat of the product set by the product setting switch and a changed weight. 6. The showcase according to claim 4 or 5, wherein the showcase is characterized.   The commodity display detection means is a radiation temperature sensor that measures a change in increase or decrease in goods displayed in the storage room as a change in increase or decrease in product surface temperature displayed in the storage room. The showcase according to claim 3.   The said radiation temperature sensor is provided in the bottom face of each shelf except the ceiling part of the said storage room or the ceiling part of the said storage room, and the lowest shelf of the said storage room. Showcase. It has a product setting switch that sets the type of product to be cooled,
The control device corrects the product surface temperature according to the emissivity of the product set by the product setting switch, and determines the amount of change in the compressor capacity and / or the operation time when the compressor capacity is changed. The showcase according to claim 7 or 8, wherein A fan for the inside that blows air toward the evaporator,
The control device increases the rotational speed of the compressor in accordance with an increase in the number of products detected by the commodity display detection means, thereby increasing or decreasing the compressor capacity for a certain period of time and increasing the rotational speed of the internal fan. The showcase according to any one of claims 2 to 9, wherein In a showcase having a storage chamber in which a compressor, a radiator, a throttle device, and an evaporator are connected by piping to constitute a refrigerant circuit, and cooling is performed using heat absorption in the evaporator,
A lighting device for illuminating the storage room;
A lighting switch for turning on and off the lighting device;
When the illumination switch is turned on, the rotational speed of the compressor is increased to increase the compressor capacity for a certain period of time, or when the illumination switch is turned off, the rotational speed of the compressor is reduced to reduce the compressor capacity. A showcase, comprising: a control device for controlling the compressor capacity to change for a certain period of time by either decreasing the period of time.

Images