JPH0350191B2 - - Google Patents

Description

Detailed Description of the Invention The present invention relates to a cooling device that dehumidifies and cools the inside of a refrigerator, and its purpose is to dehumidify the cold air inside the refrigerator without passing it through the evaporator when the supply of liquid refrigerant to the evaporator is stopped. The purpose is to maintain the humidity inside the refrigerator at an appropriate level. More specifically, one of the two vents used as the outlet when supplying liquid refrigerant to the evaporator is used as an inlet for the cold air inside the refrigerator when the supply of liquid refrigerant is stopped, allowing the cold air to flow through the refrigerator without passing through the evaporator. The purpose is to dehumidify the cold air inside using a dehumidifying heater.

Embodiments of the cooling device of the present invention will be described below based on the drawings. 1 shown in FIGS. 1 to 3 is attached to the side wall of a relatively large-sized, for example, prefabricated refrigerator A, and the interior B is controlled to a preset humidity and temperature. This is a cooling unit that maintains a constant temperature, and its main body is composed of a case 2 made of a metal plate. Inside this case, there is a plate fin type evaporator 3 and an axial flow type first evaporator installed in parallel on the lee side of this evaporator. and second blowers 4 and 5. Reference numerals 6 and 7 denote first and second circular vent holes that are formed in parallel on the upper part of the front wall of the case 2 so as to be located on the leeward side of the evaporator, and the propellers 4a and 5a of the two blowers are installed therein. There is. Reference numeral 8 denotes a third rectangular vent hole formed in the lower part of the front wall of the case 2 so as to be located on the windward side of the evaporator. A dehumidifying heater 9 is a sheathed heater having spiral fins 9a, and is connected to the evaporator 3 and both the first and second vents 6, 7.
It is arranged between the evaporator 3 and the evaporator 3, and is energized when the supply of liquid refrigerant to the evaporator 3 is stopped. Reference numeral 10 denotes an internal temperature regulator that closes when a preset upper limit temperature is reached and opens when a lower limit temperature is reached, and operates a compressor, which will be described later, based on the temperature of the cold air heat exchanged in the evaporator 3. or stop it. The evaporator has a large number of plate-like fins 3a arranged in parallel at equal intervals, left and right tube plates 3b disposed on both sides of the fins, and a fin extending through the fins and both tube plates at right angles to each other. Multiple refrigerant pipes 3
A defrost heater 11, which is energized during defrosting, is disposed on the lower surface that serves as the air inlet surface. Reference numeral 12 denotes a condensing unit that constitutes a refrigeration cycle together with the cooling unit, and includes a refrigerant compressor 1 whose operation is controlled by the internal temperature controller 10.
3. Equipped with a condenser 14 and a pressure reducing mechanism 15 such as a capillary reach tube, the high temperature and high pressure gas refrigerant compressed by the compressor 13 is converted into high pressure liquid refrigerant in the condenser 14, and further depressurized by the pressure reducing mechanism 15 to become low pressure liquid refrigerant. The low-pressure gas refrigerant is sent to the evaporator 3 as heat exchanger with the cold air flow passing through the cooling unit 1, and is then led to the compressor 13 to be compressed again, forming a well-known refrigeration cycle.

FIG. 4 shows an electric circuit diagram of the control device C of the cooling device, in which 16 is an AC power supply, 17 is a timer motor 1
7T, a defrosting timer device consisting of both first and second tangent contacts 17a ¹ , 17a ² and a reverse contact 17b, the first blower 4 is connected in series to the first tangent contact 17a ¹ of this timer device, and The second tangent point ^17a2 is connected to a second blower 5, which is connected in parallel to each other, via an internal temperature controller 10.
A parallel circuit of compressor 13 and relay X is connected,
Further, a defrosting heater 11 is connected in series to the reverse contact 17b. The reverse contact Xb of the relay is connected in series to the power source 16 via the dehumidifying heater 9 and the second positive contact ^17a2 .

There is currently no defrosting output in the defrost timer device 17, so both the first and second contacts 17a ¹ and 17a ² are closed, and the inside of the refrigerator B
temperature is high and reaches the upper limit temperature, the internal temperature controller 10
When closed, the compressor 13 and both the first and second blowers 4 and 5 are operated, and the evaporator 3 is supplied with liquid refrigerant. Therefore, the cold air that has undergone heat exchange with the liquid refrigerant passing through the evaporator 3 is blown out into the refrigerator interior B from the first and second vents 6 and 7 by both the first and second blowers 4 and 5. The air is forced to circulate through the refrigerator interior B and return to the evaporator 3 through the third vent 8 as shown by the arrow in FIG. 2, thereby cooling the refrigerator interior B. During this cooling operation, the relay X is energized, its reverse contact Xb is open, and the dehumidifying heater 9 is de-energized.

As the cooling operation progresses, the temperature inside the refrigerator B becomes lower.
When the lower limit temperature is reached, the internal temperature regulator 10 opens, and the compressor 13 and second blower 5 stop operating. Also, relay X becomes de-energized and its reverse contact
Xb is closed and the dehumidifying heater 9 is energized. This stops the refrigerant supply to the evaporator 3, but
Since the first blower 4 is in operation, the cold air inside the refrigerator B is sucked into the upper part of the case 2 from the second vent 7, is heat exchanged and dehumidified by the dehumidifying heater 9, and then enters the refrigerator from the first vent 6. B is blown out. In other words, inside B
The inside of the refrigerator B is dehumidified by forcedly circulating the cold air as shown by the arrow in Fig. 3.

As the compressor 13 continues to operate intermittently, the evaporator 3
When the amount of frost increases and the defrosting timer device 17 issues a defrosting output, both the first and second tangent points 17a ¹ ,
^17a2 is opened, and the reverse contact 17b is closed, and the defrosting operation by the defrosting heater 11 is started. During this defrosting operation, the compressor 13, the first and second blowers 4 and 5, the relay X, and the dehumidifying heater 9 are de-energized.

Figure 5 shows both the first and second blowers 4 and 5, and the compressor 1.
3 is a characteristic diagram in which the operation of No. 3, the closing of the internal temperature regulator 10, and the energization state of the dehumidifying heater 9 are indicated by diagonal lines, respectively.

According to such a configuration, when the liquid refrigerant is supplied to the evaporator 3, the cold air circulated by the first and second blowers 4 and 5 removes moisture from the products in the warehouse B and deposits it on the evaporator 3 as frost. By simultaneously dehumidifying and cooling the interior B of the refrigerator, the interior B can be maintained at an appropriate humidity and temperature. In addition, when the supply of liquid refrigerant to the evaporator 3 is stopped, the operation of the first blower 4 is continued, the operation of the second blower 5 is stopped (reverse operation is also possible), and the dehumidifying heater 9 is energized to blow the cold air inside the refrigerator B. The moisture is sucked into the case 2 through the second vent 7, dehumidified by heat exchange with the dehumidifying heater 9, and then blown out from the first vent 6 into the refrigerator interior B. Therefore, the moisture coming out from the products and the interior B of the refrigerator A as the door opens and closes.
In addition, since the evaporator 3 and the frost attached to the evaporator act as resistance during the circulation of cold air, the cold air inside the refrigerator does not enter the case 2 from the third vent 8. This makes it possible to prevent humidification due to frost adhering to the evaporator 3 and to perform extremely efficient dehumidification.

As described above, in the present invention, when liquid refrigerant is being supplied to the evaporator, cold air is blown out from both vents as blow-off ports, and when the supply of liquid refrigerant is stopped, cold air is sucked in from one of the vents. However, after being dehumidified by the dehumidifying heater without passing through the evaporator, it can be blown out into the refrigerator from the other vent, making it possible to perform extremely efficient dehumidification.

[Brief explanation of drawings]

The drawings show an embodiment of the cooling device of the present invention, and FIG. 1 is a longitudinal sectional view of a refrigerator equipped with the cooling device, FIG.
Figure 3 is a perspective view of the cooling unit showing the circulation of cold air when liquid refrigerant is supplied to the evaporator and when it is stopped.
The figure is an electric circuit diagram, and FIG. 5 is a characteristic diagram showing the control state of each component. 1...Cooling unit, 2...Case, 3...Evaporator, 4, 5...Blower, 4a, 5a...Propeller, 6, 7, 8...Vent, 9...Dehumidifying heater.

Claims (1)

[Claims] 1. A plate fin type evaporator and at least two axial flow type blowers are housed in a case constituting a cooling unit installed inside the refrigerator, and the evaporator is heated in the case when liquid refrigerant is supplied to the evaporator. At least two adjacent vents are located on the leeward side and serve as cold air outlets and each has a propeller of a blower, and a vent located on the windward side serves as a cold air inlet. In addition to installing a dehumidifying heater that is energized when the supply of liquid refrigerant to the evaporator is stopped between the air outlet and both vents that serve as air outlets, one fan is operated when the supply of liquid refrigerant to the evaporator is stopped, and the other fan is reversed or stopped. A cooling device characterized by being provided with a control device that