JPH02213683A - Cold storage display case - Google Patents

Abstract

PURPOSE:To effect switchover of humidity in a refrigerator by a simple operation with one unit by providing a humidity changeover switch for selectively operating one of dehumidifier and a humidifier of a cold storage display case, and a humidity sensor for controlling ON, OFF the selected dehumidifier or humidifier in response to humidity in the refrigerator to set humidity. CONSTITUTION:Humidity control in a refrigerator has three types of low, normal and high humidifies, which are manually selected according to the type of a load. If the humidity in the refrigerator in a display case is desired to be lowered, a humidity changeover switch 23 is set to a low humidity position, and a humidity sensor 24 is set, for example, to 30% of humidity. A parallel circuit of a three-way solenoid valve 2 and a dehumidifying heater 15 is connected to a power source bus UW via the sensor 24. The valve 2 is operated, high temperature refrigerant of a compressor 1 is fed to a heating pipe 8, and the heater 15 is energized. Thus, chilled gas passing through a diffusing duct A from a cooler 6 is heated, reduced in humidity, and diffused to a display rack 13. If the humidity is desired to be maintained at a high valve, the switch 23 is set to a high humidity position, and the sensor 24 is set, for example, to 75%.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a refrigerated showcase that has been improved so that the inside of the refrigerator can be kept at a low temperature and humidity can be controlled.

(Prior art) Conventionally, in a refrigerated showcase, a cooler consisting of the evaporator of the refrigeration cycle is placed in the lower part of the refrigerator, which is partially surrounded by transparent glass, so that it cannot be seen from the outside, and the refrigerator is placed in the upper part. Fluorescent lights are installed to illuminate the inside of the refrigerator, and a compressor, condenser, fan, etc. are placed in the machine room below the outside of the refrigerator, and connected to a cooler at the bottom of the refrigerator. It is designed to circulate cold air inside the refrigerator.

(Problem to be solved by the invention) However, the conventional refrigerated showcase is not suitable for storing Western confectionery (cakes).
Most of them are for high humidity and are suitable for storing Japanese sweets (bread-related). Refrigerated showcases for low humidity, which are suitable for storing cigarettes, nests, coffee beans, etc., are occasionally seen, but they are independent from refrigerated showcases for high humidity, and are only for high humidity. The showcase and the refrigerated showcase dedicated to low humidity were completely separated by purpose.

For this reason, conventionally, it was necessary to separately purchase and prepare two types of refrigerated showcases, one for high humidity and one for low humidity, depending on the product being stored, and the refrigerated showcase could be replaced depending on the product being stored. I had to reinstall it.

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a refrigerated showcase in which the humidity inside the refrigerator can be switched and set with a simple operation using a single device.

[Structure of the Invention] (Means for Solving the Problem) The present invention provides a refrigerated showcase in which a cooler constituting a refrigeration cycle is provided, in which cold air passing through the cooler is heated and dehumidified. a dehumidifier for evaporating and humidifying water supplied into the refrigerator; a humidity selector switch for selectively operating either the dehumidifier or the humidifier; and a selected dehumidifier or humidifier. The humidity sensor is equipped with a humidity sensor that controls on/off depending on the humidity inside the refrigerator relative to the set humidity.

(Function) When a dehumidifier is selected with the humidity selector switch, the cold air passing through the cooler is heated and dehumidified by the dehumidifier, and the dehumidification operation of the dehumidifier is controlled by the humidity sensor. On/off control is performed depending on the humidity inside the refrigerator.Therefore, the humidity inside the refrigerated showcase is maintained at a low humidity setting.

On the other hand, when a humidifier is selected with the humidity selector switch, the cold air passing through the cooler is humidified by that humidifier, and the humidifying operation of the humidifier is determined by the humidity sensor depending on the humidity inside the refrigerator relative to the set humidity. On/off control is performed. Therefore, the internal humidity of the refrigerated showcase is maintained at a high humidity setting.

Therefore, it is possible to easily switch and set the internal humidity with one device, and it is possible to store products for high humidity and products for low humidity at low temperatures.

<Example) Hereinafter, the present invention will be explained based on illustrated embodiments.

FIG. 1 is a side sectional view of the refrigerated showcase.

The refrigerated showcase is composed of a heat-insulating box 11 having a heat-insulating door 12 on the front and a display shelf 13 inside, and a machine room 14 provided below the heat-insulating box 11.

1 and 2, the machine room 14 includes an accumulator 7, a compression IT, a three-way solenoid valve 2° condenser 3. A dryer 4, a capillary tube 5, and a cooler 6 are provided in a heat insulating box 11, and these are connected in order through piping as shown in FIG. 2 to constitute a refrigeration cycle. A heating pipe 8 serves as a dehumidifier that heats the cold air passing through the cooler 6 to dehumidify it. The three-way solenoid valve 2 allows the refrigerant to flow as shown by the solid line in FIG. 2 in the normal case and when the high temperature is set, but when the humidity is set to the low humidity, the three-way solenoid valve 2 switches to flow the high temperature refrigerant from the pressure ant to the heating pipe 8.

A circulation fan 9 that is constantly driven to rotate is provided near the cooler 6, and a fan 10 is provided near the condenser 3.

In FIG. 1, inside the insulation box 11 there is a display shelf 13.
A cooler 6 is provided between the cooler 6 and the back wall of the insulation box 11, and a circulation fan 9 is provided near the bottom of the cooler 6, so that the circulation fan 9 circulates the cool air inside the refrigerator. That is, around the outer periphery of the display shelf 13, there is an internal blow-off duct A that sends cold air from the upper and front parts of the display shelf 13 and the cooler 6 from the rear part, and from the front part of the display shelf 13 to the lower part. A return duct B is formed which returns to the circulation fan 9 via the front and rear parts.

A dehumidifier 15, which is a dehumidifier that heats and dehumidifies the cold air passing through the cooler 6 when the humidity is set to low humidity, is installed in the internal air outlet duct A, and is a component of the refrigeration cycle. A certain heating pipe 8 is also provided within this internal air outlet duct A. Further, in the return duct B, a humidifier 20 is provided which evaporates and humidifies the water supplied into the refrigerator when the high temperature is set.

As shown in FIG. 5, this humidifier 20 includes a humidifying tray 16 and a humidifying tank 17 that heats the lower surface of the humidifying tray 16 to evaporate water. The water supply pipe that supplies drain water or normal water to this humidifying dish 16 can be opened and closed by a water supply solenoid valve 18, and
The water level of the water supplied to the humidifying tray 16 is configured to be detected by a water level switch 19. The humidifying heater 17 is wrapped with an aluminum tape, and the humidifying tray 16 is covered with a heat insulating material from the outside to keep it warm in order to improve the humidifying effect.

FIG. 3 shows a specific circuit of the internal humidity control device.

A voltage 6611 is connected to the line after passing through the electromagnetic switch 21 from the three-phase AC power supply bus line UVW, and the fan 10 is connected to two of the lines. 2 bus l5 of 3 phase AC power supply bus
A temperature control switch 22, a relay contact 51c, and a relay 52c are connected in series between UW. For example, the temperature control switch 22 controls the internal temperature of 10°C.
When the internal temperature rises above that level, it turns ON, and when it falls below that level, it turns OFF. When the temperature control switch 22 is ON, the relay 52c is energized,
The contact 52c in the electromagnetic switch 21 is closed, the compressor 1 and the fan 10 are driven to rotate, and the temperature inside the refrigerator is cooled.
operation will be stopped. Thereby, as shown in the upper diagram of FIG. 4, the temperature inside the refrigerator is maintained at around 10°C.

In addition, compression ai! When the current flowing through the fan 10 becomes excessive, the relay 51c operates to close the contact 51.
When c is 0FFL, power to the compressor 1 and fan 10 is cut off.

Furthermore, a circulation fan 9 is connected between the two busbars UW of the three-phase AC power supply busbar, and two circuits for controlling the humidity inside the refrigerator are connected.
That is, the low humidity circuit and the high humidity circuit are connected to the humidity selector switch 2.
3 are switchably connected.

The first low humidity circuit is a parallel circuit of the dehumidifier 15 and the three-way solenoid valve 2 of the refrigeration cycle, and the second high humidity circuit is a parallel circuit of the water supply solenoid valve 18 and water level switch 19. It is a series circuit and a parallel circuit with the above humidifier 17,
A humidity sensor 24 is commonly connected in series to these two circuits.

The humidity selection switch 23 has three selection positions: low humidity, 1 normal (NOR), and high humidity.
The (NOR) position is neutral and not connected to anything in particular.

The humidity sensor 24 utilizes the fact that a wet polymer film such as a resin swells due to moisture absorption and contracts due to dehumidification.
It is configured to operate a microswitch,
It is configured so that the humidity can be set by adjusting the distance at which the polymer membrane hits the actuator of the microswitch using a cam. However, the humidity sensor 24 may be a known humidity sensor with higher accuracy. For example, a thermistor humidity sensor, lithium chloride humidity sensor, ceramic humidity sensor, resistive polymer membrane humidity sensor, capacitive polymer membrane humidity sensor, etc. There is a humidity sensor, etc., and these analog outputs are extracted as on/off signals by appropriate circuits to turn on/off electronic switches provided in the energizing paths of the low humidity circuit and high humidity circuit. Good too.

Next, the operation of internal humidity control will be explained.

There are three types of humidity control in the refrigerator: low humidity 1 normal (NOR) and high humidity, which can be manually selected depending on the type of load placed in the refrigerator. Note that the circulation fan 9 is driven regardless of whether the humidity changeover switch 23 is switched or whether the humidity sensor 24 is turned on or off.

(1) Normal (NOR) position When the humidity selector switch 23 is selected to the normal (NOR) position, the three-way solenoid valve 2 is in a de-energized state, and the refrigerant is transferred to the compressor as shown by the solid line in FIG. The high-temperature refrigerant from 1 enters the condenser 3 through the three-way solenoid valve 2, is condensed by air cooling by the fan 10, passes through the dryer 4, is depressurized by the capillary tube 5, and is then supplied to the cooler 6, where it is cooled by the circulation fan 9. After the blown internal air and the evaporative cold in the cooler 6 exchange heat and cool the internal air, the air returns to the compressor Ill via the accumulator 7. For temperature control, as already mentioned, the temperature control switch 22 is connected to the relay 52.
This is done by controlling ON/OFF of 0.

In the case of this normal (NOR) position, the humidity inside the SHOUKES is R730°C (55%) with respect to the change in the outside air temperature RT when the outside air temperature RH is 40%, as shown in the NOR data shown in the lower part of Figure 4.

R720°C (65%) and R710°C (50%).

(2) Low humidity position If you want to lower the humidity inside the showcase, such as when storing tobacco, tea, coffee beans, etc., use the humidity selector switch 23.
is set to the low humidity position, and the humidity sensor 24 is set to the humidity 3 position, for example.
Set to 0%. Thereby, the parallel circuit of the three-way solenoid valve 2 and the dehumidifying heater 15 is connected to the power supply bus UW via the humidity sensor 24. Therefore, the three-way solenoid valve 2 operates,
As shown by the dotted line in FIG. 2, the high-temperature refrigerant of the compressor 11 flows through the heating pipe 8, and at the same time, the dehumidifier 15 is energized. Therefore, the heating pipe 8 and the dehumidifying heater 15 heat and dehumidify the cool air passing through the interior blow-off duct A from the cooler 6, and the cool air after dehumidification is blown out to the display shelf 13.

The humidity sensor 24 sets the humidity sensor 24 to 0FFL when the humidity inside the refrigerator is lower than the set humidity of 30%, and sets the three-way solenoid valve 2 to a non-operating state and the dehumidifying heater 15 to a non-energizing state. Further, when the humidity inside the refrigerator reaches the set humidity of 30% or more, it is turned on, and the three-way solenoid valve 2 is activated and the dehumidifier 15 is energized, thereby exerting the dehumidification effect by heating. By controlling the heating pipe 8 and the dehumidifying heater 15 by the humidity sensor 24, the humidity inside the refrigerator is maintained at a low level. For example, as shown as low humidity data in FIG.
, R720°C (30%), and R710°C (30%).

(3) High temperature position Next, if you want to maintain the humidity inside the showcase at high humidity, such as when making Western confectionery (cake) or Japanese confectionery (bread-related), set the humidity selector switch 23 to the high humidity position and set the humidity sensor 24 to the high humidity position. For example, set it to 75%. By setting the humidity selector switch 23 to the high temperature position, the refrigerant flows directly from the three-way solenoid valve 2 to the condenser 3 (solid line in Figure 2), and at the same time, the humidifier 17 is energized and the water supply solenoid is turned on. When the valve 18 is ONL, water enters the humidifying tray 16 from the water supply pipe.

The water level in the humidifying tray 16 rises and the water level switch 19 turns OFF.
By doing so, the water supply solenoid valve 18 goes to 0FFt, and the water supply is automatically stopped.

The water in the humidifying tray 16 is heated by the humidifier 17 and becomes evaporated, thereby humidifying the cold air in the return duct B and, as a result, humidifying the cold air blown out from the blow-off duct A through the cooler 6. When the water in the humidifying tray 16 falls below a predetermined water level,
The water supply electromagnetic valve 18 is turned on again to supply water, and the water in the humidifying tray 16 is maintained at a predetermined water level.

The humidity sensor 24 is turned off when the humidity inside the refrigerator rises above the set humidity of 75%, and the humidifier 17 and the water supply solenoid valve 18 are de-energized.

In addition, when the humidity inside the refrigerator becomes lower than the set humidity 75%, it is turned ON to energize the humidifying heater 17 and restore the automatic water supply function by the water supply solenoid valve 18 and the water level switch 19, and the humidifier 20 Demonstrates the humidifying effect of

By controlling the humidifier 17 and automatic water supply control by the humidity sensor 24, the humidity inside the refrigerator is maintained at a high level. For example, as shown in the high humidity data in FIG.
).

R720°C (80%) and R710°C (78%).

According to the above embodiment, one unit can lower the humidity inside the refrigerator.

The setting can be changed to a high temperature, and the operation is extremely simple, as all that is required is switching the humidity changeover switch 23 and setting the humidity of the humidity sensor 24.

Therefore, even if the preserved product is a high-temperature preservation product such as a Western confectionery (cake) or Japanese confectionery or bread-related product, or a low-humidity preservation product such as tobacco, tea, or coffee beans, it can be appropriately preserved. Further, the refrigeration cycle may be a simple cycle and can be performed with simple operation control. Furthermore, water supply during humidification can be done automatically, so there is no hassle.

Although preferred embodiments have been described above, the present invention is not limited thereto.

For example, in the above embodiment, the heating pipe 8 and the dehumidifier 15 are used as humidifiers, but only one of them can be provided as a humidifier.

Further, as shown in FIG. 6, one half of one refrigerated showcase can be dedicated to low humidity and the other half can be dedicated to high humidity. Furthermore, as shown in FIG. 7, the refrigerated sissy case may be provided with a plurality of chambers that can be changed to a low humidity state and a high humidity state.

[Effects of the Invention] As described above, the refrigerated showcase of the present invention can easily switch and set the internal humidity between low humidity and high humidity with a single unit, and can be used for high humidity products and low humidity products. products can be stored at low temperatures. Moreover, the switching operation only requires switching the humidity selector switch and changing the humidity setting of the humidity sensor.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a refrigerated showcase according to an embodiment of the present invention, FIG. 2 is a refrigeration cycle diagram thereof, and FIG. 3 is a control circuit diagram.
FIG. 4 is a diagram showing an example of temperature control and humidity control, FIG. 5 is a diagram showing an example of the configuration of a humidifier, and FIGS. 6 and 7 are diagrams each showing a modified example of the refrigerated showcase. In the figure, 1 is a compressor, 2 is a three-way solenoid valve, 3 is a condenser, 4 is a dryer, 5 is a capillary tube, 6 is a cooler, 7 is an accumulator, 8 is a heating pipe, 9 is a circulation fan,
10 is a fan, 11 is a heat insulation box, 12 is a heat insulation field, 13 is a display shelf, 14 is a machine room, 15 is a dehumidifying heater, 16 is a humidifying tray, 17 is a humidifying heater, 18 is a water supply solenoid valve, 19 is a water level switch, 20 is a humidifier, 22 is a temperature control switch, 23 is a humidity changeover switch, and 24 is a humidity sensor.

Claims (1)

[Claims] 1. In a refrigerated showcase in which a cooler constituting a refrigeration cycle is installed inside the refrigerator, a dehumidifier is installed to heat and dehumidify the cold air passing through the cooler, and a dehumidifier is installed to evaporate the water supplied into the refrigerator. a humidity selector switch that selectively operates one of the dehumidifier and humidifier, and a humidity switch that controls the selected dehumidifier or humidifier on and off according to the humidity in the refrigerator relative to the set humidity. A refrigerated showcase characterized by being equipped with a sensor.