JP2000139635A - Show case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antisweat system capable of effectively preventing occurrence of dew condensation of a seeing-through door by utilizing the exhaust during the operation of a conditioning unit without influence of operation and stop cycle of a refrigerator conditioning unit mounted on a show case. SOLUTION: This refrigerator built-in type show case is provided with a seeing-through door 11 on a commodity display room of a case main body 1, and a forced air-cooled conditioning unit 7 of a refrigerator for keeping cold the interior of the commodity display room installed in a machine room 8 in the lower part of the case. In this case, an exhaust air guide duct 12 is provided on the outside of the case main body with a suction opening 12a facing on the exhaust side of the machine room and a discharge port 12b at the other end opened toward the outer surface of the door of the seeing-through door, and a duct fan 13 is provided in the interior of the exhaust air guide duct. Whereby during the operation of the conditioning unit, the exhaust hot air is blown out through the exhaust air guide duct to the door outer surface of the seeing-through door and during the stop of the conditioning unit, the outside air is done so to continue antisweat function of the seeing-through door.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a showcase with a built-in refrigerator, and more particularly to a structure for preventing dew condensation on a see-through door provided in a product display room.

[0002]

2. Description of the Related Art First, as an example of a showcase with a built-in refrigerator, a general configuration of a cold air circulation type flat showcase having a see-through door as a door for taking out and supplying goods is shown in FIG.

[0003] In the drawing, 1 is a case body, 2 is an outer box of a case body made as an open-top insulated housing, 3 is an inner box, 4 is an outer box surrounding the inner box 3 and between the outer box 2 and the inner box. The defined cool air circulation duct, 5 is a cooler (evaporator of a refrigerator), 6 is a fan in a refrigerator, 7 is a compressor, a condenser, and a fan housed in a machine room 8 defined at a lower portion of the case body 1. An air-cooling type condensing unit for a refrigerator, comprising: a kick plate 9 disposed in front of a machine room 8;
Reference numeral denotes an interior lighting lamp, and a sliding door type transparent door (transparent glass door) 11 is provided on the front surface of the case body 1. In the illustrated example, the see-through door 11 is divided into a plurality of doors arranged side by side, and each divided door is laid obliquely so as to be guided by upper and lower door rails and open and close left and right.

[0004] With such a configuration, during the cold-holding operation of the showcase, the cold air flow A cooled by heat exchange with the cooler 5 circulates through the cool air circulation duct 4 and is accommodated in the refrigerator as indicated by a dotted arrow inside the refrigerator. Keep the goods (not shown) cool.

On the other hand, an external air flow B represented by a solid arrow drawn through a suction grill 9a opened in a front kick plate 9 by a fan blown by a fan is blown to the condensing unit 7 housed in the machine room 8. After cooling down the condenser and the compressor of the condensing unit 7, the heated exhaust gas is discharged from the machine room 8 behind the showcase.

[0006]

As described above, in the reach-in type showcase in which the see-through door 11 is provided in the product display room of the case body 1, the inner surface of the see-through door 11 is cooled by the cool air in the refrigerator during the cool-down operation. For this reason, the outer surface of the see-through door is cooled below the dew point and dew condensation occurs, and the glass surface of the see-through door 11 becomes cloudy over the entire surface, making it difficult to see products in the refrigerator.

Therefore, as a countermeasure against the dew condensation, a special dew-proof glass in which a dew-proof heater is combined with the see-through door glass is used, or warm air in the store is blown out by a fan through a duct along the outer surface of the see-through door. Conventionally, a method has been known in which the outer surface of the see-through door is suppressed from dropping below the dew point to prevent the occurrence of dew condensation. In addition, the discharge port of the exhaust duct provided on the back side of the case body connected to the exhaust side of the machine room of the showcase incorporating the air-cooled condensing unit of the refrigerator is opened on the upper side of the transparent door, and this exhaust There is also known a system in which exhaust hot air is blown toward the outer surface of the see-through door by blowing air from a fan incorporated in the condensing unit through a duct.

[0008] The above-mentioned conventional system has the following problems. That is, the price which adopted the dew-proof glass for the see-through door becomes high. In the method of blowing outside air taken in from the store to the surface of the see-through door, a sufficient dew-proof effect cannot be obtained because the outside air temperature is not so high. On the other hand, in a system in which the fan in the condensing unit of the refrigerator is used to guide the exhaust from the machine room to the door surface of the see-through door, the dew-proof function works when the condensing unit is operating. However, the condensing unit was stopped (the operation of the refrigerator in the showcase is controlled so as to repeat the operation and stop periodically even during the operation of the showcase for temperature control and defrosting). To stop the ventilation to the see-through door,
During this period, dew condensation occurs on the see-through door, and the exhibitability of the product is reduced.

In addition, the outside air or the exhaust air of the refrigerator condensing unit is blown to the outside surface of the see-through door.
Even when the see-through door is opened when taking out or replenishing products, if the outside air and exhaust air continue to be blown in front of the product, a large amount of high-temperature air flows into the refrigerator and adversely affects the cooling performance. Remains.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to solve the above-mentioned problems. During operation of a refrigerator condensing unit mounted on a showcase, a see-through door utilizing the exhaust hot air is used. While effectively preventing the occurrence of condensation
It is an object of the present invention to provide a showcase having a dew-proofing function so that the dew-proofing function can be maintained even when the operation of the condensing unit is stopped, and at the same time, even when the perspective door is opened, the cooling performance in the refrigerator is not adversely affected. .

[0011]

According to the present invention, there is provided a refrigerator having a see-through door in a product display room of a case body and keeping the product display room cool in a machine room below the case according to the present invention. In the case of a refrigerator built-in type housing the air-cooled type condensing unit, the suction port faces the exhaust side of the machine room on the outside of the case body, and the discharge port on the other end is on the outer surface of the transparent door. A ventilation fan is installed inside the exhaust ventilation duct, and a duct fan is installed inside the exhaust ventilation duct to blow out the air drawn into the exhaust ventilation duct along the outer surface of the perspective door. The occurrence of dew condensation is prevented (claim 1).

According to this configuration, during operation of the refrigerator, the high-temperature exhaust gas that has passed through the condensing unit is sucked into the exhaust air duct by the duct fan from the exhaust side of the machine room, and the door of the see-through door is passed through the duct. Blow out towards the outside. Also, even when the refrigerator condensing unit is stopped, the outside air taken in from around the showcase is blown out to the door surface of the see-through door through the air guide duct by operating the duct fan. This allows the see-through door to keep the see-through door free of dew condensation while the showcase is operating, without being affected by the operation cycle of the refrigerator condensing unit.

According to a second aspect of the present invention, the power supply circuit of the duct fan in the above-described configuration is provided with a door switch that operates in response to opening of the see-through door to stop the duct fan. ).

Thus, when the see-through door is opened when taking out or resupplying goods from the refrigerator, the door switch is operated, the duct fan is stopped, and air blowing to the front of the see-through door is interrupted. Exhaust of the high refrigerator condensing unit or outside air does not flow into the refrigerator, thereby eliminating the possibility that the cooling performance in the refrigerator is adversely affected.

[0015]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to the embodiments shown in FIGS. 2A and 2B and FIGS. 2A to 2C. In the drawings of the embodiment, members corresponding to those in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted.

That is, in the illustrated embodiment, the exhaust air guide duct 12 is laid in the left and right width range of the show case so as to cover the rear surface and the upper surface of the case main body 1, and is provided inside the exhaust air guide duct 12. Is provided with a plurality of duct fans 13 dispersedly on the left and right. The exhaust air guide duct 12 has a suction port 12a facing the exhaust side of the machine room 8 defined at the lower portion of the case body 1, and the discharge port 1 at the other end.
2b is open toward the outer surface of the see-through door 11 and above.

The above-mentioned duct fan 13 is similar to the one shown in FIG.
As shown in (a), a door switch 15 that responds to opening and closing of the transparent door 11 to a power supply circuit connected to a power supply (AC 100 V) 14.
Are connected in series. As the door switch 15, for example, a limit switch is used as shown in FIGS. 2B and 2C, and the door switch 15 is installed in correspondence with each of the divided doors of the see-through door 11 and in accordance with the closed position of the door. . With such a configuration, if each of the divided doors of the see-through door 11 is closed, as shown in FIG. On the other hand, for example, when the left split door is opened, the left door switch 15 is turned off in response to this, and the operation of the duct fan 13 is stopped. The duct fan 13 is always operable during the operation of the showcase, regardless of whether the refrigerator condensing unit 7 is operating or stopped.

Next, the operation of the above configuration will be described.
When the condensing unit 7 of the showcase refrigerator is operating, the exhaust of the condensing unit 7 discharged from the machine room 8 to the rear (warm air that has been heated by removing heat from the compressor and the condenser) is supplied to the duct fan 13. The air is sucked into the exhaust air guide duct 12 through the suction port 12a by the air blow, and is blown out from above the discharge port 12b toward the outer surface of the see-through door 11 as shown by an arrow C to flush the door surface, and the see-through door 11
Effectively prevent the occurrence of condensation. Further, the air-cooled condensing unit 7 is stopped along with the thermocycle operation or the defrosting operation of the refrigerator (the condensing unit 7).
Even when the fan incorporated in the air conditioner is stopped, the duct fan 13 is continuously operated, so that the outside air sucked directly from the periphery of the showcase into the suction port 12a of the exhaust air guide duct 12 enters the see-through door 11. Spout towards. Therefore, the dew condensation preventing function for the see-through door 11 does not stop.

On the other hand, when the condensing unit 7 is exhausted or the outside air is blown out to the see-through door 11 as described above, or when the see-through door 11 is opened for taking out a product from the warehouse or replenishing the product, FIG. The door switch 15 described in the above is turned off, the duct fan 13 stops, and the see-through door 11 is turned off.
Ventilation to is also stopped. This prevents the exhaust gas or the outside air having a higher temperature than the inside temperature when the door is opened from flowing into the inside of the room through the door opening surface, thereby preventing a bad influence on the cool performance in the room.

[0020]

As described above, according to the configuration of the present invention, during the operation of the showcase, the operation is not affected by the operation cycle of the refrigerator condensing unit, and the operation is performed through the exhaust air duct provided with the duct fan. The air-cooling type condensing unit can be exhausted, or the outside air taken in from the surroundings while the condensing unit is stopped can be blown toward the outer surface of the see-through door to maintain the dew-proof function.

Further, the power supply circuit of the duct fan arranged in the exhaust air duct has a door switch for stopping the duct fan by operating in response to opening of the see-through door. When opened, warm air for dew-prevention does not flow into the refrigerator, and there is no possibility that the cool performance of the showcase is adversely affected.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a showcase according to an embodiment of the present invention, where (a) is a longitudinal side view and (b) is a front view.

FIG. 2 is a control circuit diagram of the duct fan in FIG. 1, wherein (a) is a power supply circuit diagram, and (b) and (c) are doors corresponding to opening and closing of the transparent door, respectively, together with the arrangement of door switches. Illustration of switch operation

FIG. 3 is a vertical sectional side view showing a general configuration of a showcase with a built-in refrigerator as an embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Showcase case body 7 Air-cooled condensing unit for refrigerator 8 Machine room 11 Perspective door 12 Exhaust air guide duct 13 Duct fan 15 Door switch

Claims (2)

[Claims] 1. A refrigerator-incorporated showcase in which a see-through door is provided in a commodity display room of a case body and a refrigerator-cooled condensing unit for keeping the commodity display room cool in a machine room below the case. An exhaust air guide duct having an inlet facing the exhaust side of the machine room and an outlet at the other end opened toward the outer surface of the see-through door is provided outside the case body. A showcase in which a duct fan is installed inside, and the air sucked into the exhaust air duct is blown out along the outer surface of the see-through door to prevent condensation from forming on the see-through door. 2. The showcase according to claim 1, wherein the power supply circuit of the duct fan includes a door switch that operates in response to opening of the see-through door to stop the duct fan.