JPS59231374A - Refrigerating case - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refrigerated case that can maintain a humidified storage or display space for articles.

As an example of a refrigerated case, as shown in FIG. 1, a transparent glass plate 2. Case body 1 separated from the outside air by a heat insulating board etc.
There is a closed type refrigerated showcase in which the interior is divided into a product display room 6 and a cooling room for cooling the display room 6, and ventilation is circulated between the two using a blower. FIG. 2 is a sectional view of this refrigerated showcase. A cooling chamber 4 for sending and returning cold air is formed below the product display chamber 6. That is, in the cooling chamber 4, a refrigerant evaporator 6 of a refrigeration circuit (not shown) is provided so as to extend along the length of the case, and a blower 5 for ventilation circulation is provided. It is designed so that it can be sucked in from the lower part, cooled, and then sent out from the outlet 8. A shelf 9 is installed in the product display room 6 so that products can be cooled and displayed.

However, since this type of refrigeration case uses only the refrigerant evaporator 6 in the refrigeration circuit, the dehumidification effect of the refrigerant evaporator B, that is, the moisture inside the case freezes on the refrigerant evaporator B, causing the inside of the case to freeze. The relative humidity of the area decreases, causing the product to dry out and lose weight despite being kept at a low temperature.

Or there is a problem of deterioration.

Generally, the most effective temperature and humidity for preventing problems such as loss of weight and deterioration of meat, delicatessen dishes, or high-end confectionery (cakes, etc.) is between 0°C and 2°C.

It is said that the humidity is between 85 and 90, but the reality is that humidifying refrigerating cases that satisfy this condition are too expensive to mass produce.

The present invention utilizes a refrigerant evaporator to create ice in the cooling chamber of a refrigerating case of the type that cools the inside of the case using a fin-type refrigerant evaporator while replenishing water from outside the case, and circulates ventilation through the ice. The purpose of this is to create low temperature and high humidity conditions, thereby solving problems such as product wear and deterioration.

The present invention will be explained in detail below.

FIG. 5 shows a cross-sectional view of the main structure of the present invention.

The closed type case body 1 includes a product display room 6 whose periphery is covered with a transparent glass plate 2, a cooling room 12 configured within a box-shaped outer panel 11 made of a heat insulator provided below the bottom plate 10, It has a machine room 13 configured below outside the outer panel 11.

The rear surface of the product display room 3 is made openable and closable with a sliding door 14 made of a transparent glass plate.

The outer panel 11 is formed by filling a heat insulating material 11c between the inner box 11a and the outer box 11b, and a water reservoir 15 is formed in the cooling chamber 12 by taking advantage of the fact that the inner box 11a is watertight. ing. A water pipe 16 is introduced into the water reservoir 15, and a constant water level is always maintained in the water reservoir 15 by means of a float valve 17.

A fin-type refrigerant evaporator 6 is provided in the water reservoir 15, and the refrigerant evaporator 6 is installed over almost the entire length of the water reservoir 15 so that the lower ends of the fins are slightly away from the water surface.

Of course, the lower end of the fin may be slightly submerged in water. Furthermore, nozzle 1 for spraying water towards refrigerant evaporator B
One or more nozzles 18 are provided depending on the length of the refrigerant evaporator B, and are connected to piping of a pump 19 that sucks water from the water reservoir 15.

The nozzle may be installed above the refrigerant evaporator or on the windward side. 20 is a drain pipe.

Inside the machine room 16, there are a refrigerant compressor 21 for the refrigeration circuit, a refrigerant condenser 22. A blower 26 and the like for heat radiation are provided.

The refrigerant that has been compressed by the refrigerant compressor 21 and passed through the refrigerant condenser 22 passes through the capillary tube 24 and is gasified in the refrigerant evaporator 6 and returns to the refrigerant compressor 21.

This refrigerated case is operated as follows.

When the refrigerant is supplied to the refrigerant evaporator 6 and the pump 19 is driven, water droplets blown onto the refrigerant evaporator B are cooled on the fin surfaces and become ice-like, and the second icing phenomenon progresses.

Therefore, the air being circulated by the waterproof blower 5 is
While passing through the cooling chamber 12, it comes into contact with the water surface of the water tank 15, the ice wetted by the refrigerant evaporator 6, and the water droplets being sprayed, and is sufficiently humidified and cooled at the same time.

In this state, the refrigerant compressor 21. Even if the pump 19 is stopped, the air still being circulated by the blower 5.

Humidification is performed by the water surface of the water reservoir 15, and further humidification and cooling are performed by the ice wet on the fin surfaces.

In this way, in the present invention, the refrigeration circuit, the blower 5° pump 1
9 is in operation, a high humidification cooling operation is performed, and while the refrigeration circuit and pump 19 are stopped, a low humidification cooling operation with a slightly lower humidification capacity than the high humidification cooling operation is performed. Note that during low humidification cooling operation, it is preferable to reduce the amount of air blown. This can be achieved by stopping the . Of course, when humidification is not required at all, the water reservoir 15 can be emptied and the pump 19 can be stopped to perform a cooling operation similar to the conventional one.

The high humidification cooling operation and the low humidification cooling operation as described above can be performed alternately by sequence control using, for example, a timer. In other words, the time required for a certain thickness of ice to form so as not to block the space between the refrigerant evaporators 6 during high humidification cooling operation, and the time required for the above constant thickness of ice to melt during low humidification cooling operation, are measured, and the optimum time is set. The refrigeration circuit and pump 19 may be driven and stopped periodically using a timer. Another method is to install an ice detector in the refrigerant evaporator and use its output to activate the refrigeration circuit.

Pumps can also be controlled. By performing such control, the interior of the product display room 6 is always maintained at a low temperature and a high humidity state.

As described above, in the present invention, circulating air is humidified and cooled while passing through a water surface forcibly generated by external water supply to the refrigerant evaporator, and the fins of the refrigerant evaporator.

Since the refrigerant pipes have a large surface area and the circulating air also comes into contact with the water droplets blown onto the refrigerant evaporator, sufficient humidification and cooling is achieved to satisfy the most effective temperature and humidity conditions mentioned above. Since the water in the reservoir is still cooled to the point where it does not freeze, it also has a sterilizing effect on bacteria, excluding psychrophilic bacteria. Of course, the present invention is not limited to the refrigerated case shown in FIG. 1, but can also be applied to any other closed type refrigerated case and oven type showcase having a partition structure with an air curtain.

[Brief explanation of the drawing]

Figure 1 shows a perspective view of an example of a closed type refrigerating case, Figure 2 is a sectional view of the refrigerator case in Figure 1, and Figure 6 shows a cross-sectional view of the refrigerator case in Figure 1.
The figure is a sectional view of a main part when the present invention is applied to the refrigerating case of FIG. 1. In the figure, 2 is a transparent glass plate and 5 is a product display room. 5 is a blower, 6 is a refrigerant evaporator, and 12 is a cooling chamber. Figure 3

Claims (1)

[Claims] 1) In a refrigerated case where the inside of the case, which is separated from the outside air by a heat insulating material or the like, is divided into a storage or display room for goods and a cooling room equipped with a cooling means, and where these two rooms are circulated by a blower, the above-mentioned cooling means is used. A water reservoir for maintaining a predetermined water level is provided in the cooling chamber, a refrigerant evaporator is provided near the water surface of the water reservoir, and means is provided for blowing water from the water reservoir onto the refrigerant evaporator, A refrigeration case characterized in that it is possible to switch between a high humidification cooling operation and a low humidification cooling operation by changing the operating state of the refrigerant compressor and the refrigerant compressor.