JPH10281622A - Low-temperature showcase - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent dew formation properly by mounting an electrical heater and a moisture sensor to the part of a body where a dew is formed and providing a control device for energizing the electrical heater in a saturation state based on the output of the moisture sensor. SOLUTION: An electrical heater 11 for preventing dew formation is mounted to the inner surface of an outer box 21 for constituting a side wall 2A and a ceiling wall 2B of a body 2 where a dew is easily formed. Then, the heater 11 is connected to a control device. Also, a moisture sensor 12 for detecting a relative humidity is mounted to the side wall 2A and is also connected to the control device. Then, when humidity near the side wall 2A becomes saturated, the moisture sensor 12 detects the saturation and the electrical heater 11 generates heat by the control device. When the humidity being detected by the moisture sensor 12 decreases to a specific value or less, the energization to the electrical heater 11 is broken, thus enabling the control device to energize the electrical heater 11 only when a saturation is reached and hence saving energy drastically.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-temperature showcase installed in, for example, a convenience store.

[0002]

2. Description of the Related Art Conventionally, a supermarket or a convenience store is provided with a plurality of low-temperature showcases as disclosed in, for example, Japanese Patent Publication No. 3-39032 (F25D21 / 04). When these low-temperature showcases are operated and the storage room is cooled, the doors, the bottom surface, the top surface, the back surface, the side surfaces, and the like of the low-temperature showcase have a lower temperature than the store due to heat conduction.

On the other hand, in a store, the temperature in the store is low during the rainy season, and air conditioning is hardly used. In such a period, the bottom surface, the top surface, the back surface, the side surface, and the like are cooled below the dew point temperature by the cooling operation of the low-temperature showcase, so that a large amount of dew has been generated in those portions. For this reason, problems such as the occurrence of problems such as the customer's clothes getting wet due to condensation on the side surfaces of the low-temperature showcase, and the problem of the tiles being peeled off in recent years due to the floor surface getting wet due to the condensation often occur. there were.

In order to prevent these problems,
As described in the above publication, the warm air from the machine room is supplied to the door, or the blower is attached to the floor side of the showcase for operation, and the floor temperature of the showcase is raised by blowing warm air in the store on the floor surface. The device was devised to prevent dew condensation. In some cases, an electric heater is provided on the wall surface of the showcase to supply power, thereby heating the wall surface to prevent dew condensation.

[0005]

However, it is possible to prevent the tiles from being peeled off by operating a blower provided on the floor side of the showcase, but the blower is operated by cooling the low-temperature showcase during the rainy season or the like. Even during the period when the temperature did not cool below the dew point, continuous operation was performed all year. For this reason, blower noise and blower damage, or
Since the operation of the blower is performed all year, there is a problem that the running cost rises.

Also, an electric heater is provided on the wall surface of the showcase to supply power, thereby heating the wall surface to prevent dew condensation. In this case, the electric heater is energized by cooling the low temperature showcase during the rainy season or the like. The heater was energized even when the top, back and side surfaces, etc., were not cooled below the dew point temperature. For this reason, there is a problem that the running cost rises.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and provides a low-temperature showcase in which a humidity sensor is provided at a location where dew condensation is likely to occur, and appropriate dew condensation prevention control can be performed. The purpose is to provide.

[0008]

According to the first aspect of the present invention, there is provided a low-temperature showcase comprising an electric heater and a humidity sensor attached to a dew point of a main body and an electric heater in a saturated state based on an output of the humidity sensor. It is provided with a control device for energizing the heater.

The low-temperature showcase according to the second aspect of the present invention provides a low-temperature showcase, wherein a humidity sensor attached to a dew-condensed portion of the main body, a blower for blowing the portion, and the blower operating in a saturated state based on an output of the humidity sensor. The control device includes

[0010]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a low-temperature showcase 1 of the present invention, FIG. 2 is a perspective view of the low-temperature showcase 1, and FIG.
FIG. 4 is a partially exploded perspective view of the low-temperature showcase 1, FIG. 4 is an enlarged front view of a circle A in FIG. 3, FIG. 5 is a vertical side view of the low-temperature showcase 1 in an installed state, and FIG. Each is shown.

A low-temperature showcase 1 according to an embodiment of the present invention is installed in a store such as a convenience store, for example, and has an outer box 21 and an inner box 2 having an open front.
The storage room 6 is defined in the main body 2 composed of the heat insulating box 3 in which the heat insulating material 23 is filled between the two. On the front surface of the storage room 6, two sliding door glass doors 8, 8 are attached so as to be freely opened and closed. A partition plate 5 is attached to the inside of the heat insulating box 3, and the inside of the partition plate 5
And the outside becomes the duct 4. A cooling fan 10 and a cooler 9 constituting a cooling device are installed in the lower duct 4. The cooler 9 is a well-known refrigeration cycle such as a compressor, a condenser, and a decompression device (not shown). Is composed.

In the storage room 6, a plurality of shelves 7 for displaying goods are provided. When the compressor is operated, the high-temperature and high-pressure gas refrigerant discharged from the compressor is condensed and liquefied by the condenser, and then depressurized by a decompression device,
A predetermined cooling effect is exhibited by flowing into the cooler 9 and evaporating. The cool air cooled by the cooler 9 is sent out to the duct 4 by the cooling fan 10 and flows into the storage room 6 from above, whereby the storage room 6 is cooled to a predetermined temperature (refrigeration / freezing). Reference numeral 16 denotes a wall in the store.

On the other hand, an electric heater 11 for preventing dew formation is meandering on the inner surface of the outer box 21 constituting the side wall 2A and the top wall 2B of the main body 2 which are likely to cause dew condensation in the low-temperature showcase 1. The electric heater 11 is attached (FIG. 2), and is connected to the control device 14. The energization of the electric heater 11 is controlled by the control device 14.

The side wall 2 on which the electric heater 11 is provided
A is provided with a humidity sensor 12 for detecting the relative humidity of the location, and the humidity sensor 12 is connected to the control device 14. Note that the humidity sensor 12 is conventionally known, and a detailed description thereof will be omitted.

The outer case 21 constituting the bottom wall 2C of the main body 2 of the low-temperature showcase 1 also has the same humidity sensor 12 as described above.
A is attached, and the humidity sensor 12A is also connected to the control device 14. In addition, low-temperature showcase 1
At the front end of the bottom wall 2C of the main body 2, a plurality of (two in this case) blowers 13 are provided between the bottom wall 2C and the floor of the store.
13 are attached, and these blowers 13, 13
Is connected to the control device 14. Reference numeral 15 denotes a decorative panel, which is detachably attached to the front of the blowers 13 and 13 and has a suction gap formed between the decorative panel 15 and the floor surface.

The control device 14 is composed of a general-purpose microcomputer. The outputs of the humidity sensors 12 and 12A are input to the control device 14 as described above. (Shown here as one unit). Circuits related to cooling control are omitted.

Next, the operation of the low-temperature showcase 1 having the above configuration will be described. When the inside of the storage room 6 is cooled by the operation of the cooling device as described above, the side walls 2 of the low-temperature showcase 1 are cooled.
A, the outer box 21 forming the top wall 2B, the bottom wall 2C, or the back wall 2D also lowers to a lower temperature than in the store due to heat conduction. At the time of such cooling, especially during the rainy season, when the temperature in the store is low and air conditioning is not used, moisture in the air tends to adhere to the surface of the outer box 21 at each location of the low-temperature showcase 1 as condensation. .

When the humidity near the side wall 2A of the low-temperature showcase 1 becomes saturated, the humidity sensor 12 detects the saturation, and the controller 14 supplies a commercial power to the electric heater 11 based on the output of the humidity sensor 12. I do. As a result, the electric heater 11 generates heat, preventing the occurrence of dew condensation on the surface of the outer box 21 of the side wall 2A and the top wall 2B, or evaporating the already generated dew. When the humidity detected by the humidity sensor 12 falls below a predetermined value, the control device 14 cuts off the power supply to the electric heater 11.

As described above, in the present invention, the electric heater 11 and the humidity sensor 12 are attached to the side wall 2A and the top wall 2B of the main body 2 of the low-temperature showcase 1, and based on the humidity saturation state detected by the humidity sensor 12, , The control device 14 is configured to energize the electric heater 11, so that when the humidity of the location reaches a saturated state, the electric heater 11
Generates heat and does not reach the saturated state.
The power supply to 1 is cut off. That is, since the control device 14 energizes the electric heater 11 only when the dew condensation reaches a saturated state, it is possible to realize a significant energy saving as compared with the conventional structure in which the electric heater 11 is energized all year round. Becomes

On the other hand, the control device 14 controls the low-temperature showcase 1
When the humidity near the bottom wall 2C reaches a saturated state, the humidity sensor 12A detects this, and the control device 14 energizes both the blowers 13, 13 based on the output of the humidity sensor 12A. Thereby, the blowers 13, 13 draw in warm air in the store from below the front of the low-temperature showcase 1 between the floor and the bottom wall 2C, and discharge between the back wall 2D of the main body 2 and the wall 16 in the store. (FIG. 3 and FIG. 5 arrows). Therefore, dew condensation on the surface of the outer box 21 constituting the bottom wall 2C and the back wall 2D of the low-temperature showcase 1 is prevented beforehand by ventilation of warm air, or dew condensation already generated is eliminated. .

When the humidity detected by the humidity sensor 12A drops below a predetermined value, the controller 14 cuts off the power supply to the blowers 13, 13.

As described above, in the present invention, the blowers 13, 13 are provided on both sides of the bottom wall 2C of the low-temperature showcase 1, and
The humidity sensor 12A is attached to the bottom wall 2C where the dew condensation occurs, and the two fans 13 are energized based on the saturation state of the humidity detected by the humidity sensor 12A. The blowers 13 and 13 are operated only in a state where dew condensation occurs on the wall 2C, and the blowers 13 and 13 are stopped in a state where there is no risk of dew formation.

Thus, the blowers 13, 13 can be operated only when dew condensation occurs on the bottom wall 2C of the low-temperature showcase 1 or when dew condensation easily occurs. Therefore, as compared with the conventional case where the blowers 13 and 13 are operated all year round, it is possible to minimize the noise caused by the operation of the blowers 13 and 13 and to realize significant energy saving. Become.

[0024]

According to the first aspect of the present invention, an electric heater and a humidity sensor are attached to the dew condensation location of the low-temperature showcase main body, and based on the humidity sensor, the control device supplies electricity to the electric heater in a saturated state. As a result, it is possible to contribute to energy saving while effectively preventing the occurrence of dew condensation at the dew point.

According to the second aspect of the present invention, a humidity sensor is attached to the dew condensation location of the main body, and a blower for blowing air to the location is provided. Based on the humidity sensor, the control device operates the blower in a saturated state. In the same way, while effectively preventing the occurrence of condensation at locations where condensation has occurred,
It can contribute to energy saving. Further, the noise caused by the operation of the blower can be minimized.

[Brief description of the drawings]

FIG. 1 is a perspective view of a low-temperature showcase of the present invention.

FIG. 2 is a perspective view of the low-temperature showcase of the present invention.

FIG. 3 is a partially exploded perspective view of the low-temperature showcase of the present invention.

FIG. 4 is an enlarged front view of a circle A portion in FIG. 3;

FIG. 5 is a vertical side view of the low-temperature showcase in an installed state.

FIG. 6 is a block diagram of a low-temperature showcase control device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Low-temperature showcase 2 Main body 2A Side wall 2B Top wall 2C Bottom wall 2D back wall 3 Heat insulation box 4 Duct 6 Storage room 9 Cooler 11 Electric heater 12 Humidity sensor 12A Humidity sensor 13 Blower 14 Control device

Claims (2)

[Claims] An electric heater and a humidity sensor attached to a dew condensation point of a main body, and a control device for energizing said electric heater in a saturated state based on an output of said humidity sensor, characterized by comprising: Showcase. 2. The apparatus according to claim 1, further comprising a humidity sensor attached to a dew condensation location of the main body, a blower for blowing air to the location, and a control device for operating the blower in a saturated state based on an output of the humidity sensor. Features a low-temperature showcase.