JPH09310962A - Refrigeration device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly melt frost to shorten the defrosting operation period, in a device wherein a drain pan is provided at the lower part of an evaporator and a drain pan heater is set along the drain pan, by concentratedly installing the drain pan heater under the air suction side of the evaporator. SOLUTION: Air in refrigeration device is cooled while it flows through an evaporator 29 in a casing 23, and drain formed on the surface of the evaporator 29 drops into a drain pan 21 and is discharged through a drain hose. And during a defrosting operation, frost separated from the evaporator 29 also drops into the pan 21 and is melted by being heated by a drain pan heater 30 and discharged through the drain hose. In this case, the drain heater 30 is concentratedly disposed under the air suction side of the evaporator 29 where frost tends to drop during the defrosting operation. That is, space between the wires of the heater 30 arranged, in a serpentine pattern, in arm area, where frost tends to drop, is made narrower than the space in the other area, whereby frost dropping into the pan 21 from the evaporator 29 can be rapidly melted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner,
The present invention relates to a refrigerator such as a refrigerator and a refrigerated showcase.

[0002]

2. Description of the Related Art An example of a conventional refrigeration system is shown in FIG. An evaporator 29 is erected inside the container casing 23 so as to face the air suction port 26, and a fan 24 is arranged so as to face the air outlet 27. A drain pan 21 is installed below the evaporator 29, and a drain pan heater 20 is installed along the drain pan 21.

When the fan 24 is driven by the motor 25,
The air in the cold storage is sucked into the housing 23 from the air suction port 26, cooled in the process of flowing through the evaporator 29, and then urged by the fan 24 to be blown into the cold storage from the air outlet 27.

The drain condensed on the surface of the evaporator 29 drops into the drain pan 21 and is discharged through a drain hose (not shown). Further, during the defrost operation, the frost separated from the evaporator 29 falls into the drain pan 21, is heated by the drain pan heater 20, is melted, and is discharged through the drain hose.

[0005]

In the above conventional refrigeration system, since the drain pan heater 20 is arranged in a meandering manner at equal intervals so as to be evenly distributed over the entire surface of the drain pan 21, the defrost operation is performed. At this time, there is a problem that it takes a long time to melt the frost that has fallen from the evaporator 29 into the drain pan 21.

[0006]

The present invention has been invented in order to solve the above-mentioned problems, and the gist thereof is to install a drain pan at the bottom of an evaporator and to follow the drain pan. In a refrigerating apparatus in which a drain pan heater for flowing a refrigerant is installed, the drain pan heater is centrally installed in a lower portion on an air intake side of the evaporator in which frost is likely to drop during defrost operation.

During the defrosting operation, however, the frost that has fallen from the evaporator into the drain pan is heated by the drain pan heater and quickly melts.

[0008]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the invention is shown in FIG. Where frost is likely to fall during defrost operation, that is,
A drain pan heater 30 is centrally arranged in the lower portion of the evaporator 29 on the air intake side. That is, the interval of the meandering drain pan heater 30 is made narrower in a place where frost easily falls than in other places.

During the defrosting operation, however, the high-temperature refrigerant flows through the tube of the evaporator 29 and a part thereof flows through the drain pan heater 30. As a result, the frost separates from the surface of the evaporator 29 and falls into the drain pan 21, and is quickly melted by being heated by a large amount of heat supplied from the drain pan heater 30 centrally arranged at this location.

As a result, it is possible to shorten the defrost operation time and prevent the remaining unmelted frost from growing and blocking the air passage of the evaporator 29.

A second embodiment of the invention is shown in FIG. In the second embodiment, a large number of tubes 31 are arranged in parallel with each other at a narrow interval in a place where frost easily falls, and both ends of the large number of tubes 31 are connected to manifolds 32 and 33, respectively. . A refrigerant inlet pipe 35 is connected to the manifold 32, and one end of a tube 34 arranged so as to meander is connected to the manifold 33.
The tube 31, the manifolds 32 and 33, and the tube 34 constitute a drain pan heater.

During the defrosting operation, however, the refrigerant enters the manifold 32 from the refrigerant inlet pipe 35, branches here to enter the manifold 33 through a large number of tubes 31, joins here, and flows out via the tube 34. .

[0013]

According to the present invention, since the drain pan heater is centrally installed in the lower part of the air intake side of the evaporator where frost easily falls during the defrost operation, the frost dropped from the evaporator into the drain pan during the defrost operation is centrally installed. It is heated by the drain pan heater and melted quickly.

As a result, the defrost operation time can be shortened, and it is possible to prevent the unmelted frost from growing and blocking the air passage of the evaporator.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention, (A) is a schematic vertical sectional view of a refrigerating apparatus, and (B) is a top view of a drain pan.

FIG. 2 is a top view of a drain pan according to a second embodiment of the present invention.

FIG. 3 shows an example of a conventional refrigeration system, (A) is a schematic vertical sectional view, and (B) is a top view of a drain pan.

[Explanation of symbols]

 29 Evaporator 21 Drain pan 30 Drain pan heater

Claims (1)

[Claims] 1. A refrigerating apparatus comprising a drain pan installed at the bottom of the evaporator and a drain pan heater for flowing a refrigerant along the drain pan, wherein the frost is likely to drop during defrost operation of the drain pan heater. The refrigeration system is concentratedly installed in the lower part of the air intake side of.