JPS5813262Y2 - air cooling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air cooling device for a refrigerator/freezer, and particularly to prevention of frost formation on a propeller fan for an air cooler.

Propeller fans are often used as blowers for air coolers in refrigerators and refrigeration equipment, and propeller fans are generally placed on the air outlet side of the cooler.

As the refrigeration operation progresses, frost forms on the air cooler, and at the same time, frost forms on the blades of the propeller fan.

When the air cooler has formed a certain amount of frost, it defrosts the air using a water spray method, a hot gas method, an electric heater method, etc., but the blades are not defrosted.

That is, since the conventional air cooler defrosting method is a defrosting method for only the air cooler, the frost formed on the blades of the propeller cannot be melted.

For this reason, the amount of frost on the propeller fan blades increases with continuous refrigeration operation.

This may cause the blower to become unbalanced, leading to accidents such as damage to the blades, overload of the blower motor, and bearing seizure.

The present invention has been devised in view of the above, and its purpose is to prevent frost from forming on the propeller fan blades even if frost forms on the air cooler.

First, when considering the phenomenon of frost formation on propeller fans, the following causes can be considered for frost formation on propeller fan blades.

As the frosting of the air cooler gradually progresses as the refrigeration operation progresses, ventilation resistance increases.

As a result, the air volume of the propeller fan decreases, but due to the nature of the propeller fan, the air blown by the fan flows in a centrifugal direction rather than an axial direction as the air volume decreases.

For this reason, a region where air flows backward occurs in the center of the blowout side of the propeller fan.

Due to the occurrence of this backflow area, the air inside the refrigerator comes into contact with the fan blades.

The fan blades themselves are cooled by the air flowing out of the cooler, and are lower in temperature than the above-mentioned backflow air, that is, the temperature inside the refrigerator, so if the humidity inside the refrigerator is high, frost will form on the fan blades.

From the above point of view, the present invention prevents frost from forming on the fan blades by preventing the formation of a backflow area on the outlet side of the propeller fan, even if frost forms on the air cooler and the air volume decreases. The feature is that a duct is provided on the blowing side of the propeller fan, and even if the air volume decreases through the duct, the blowing air is blown out in the axial flow direction, thereby preventing the occurrence of a backflow region.

An embodiment of the present invention will be explained in detail with reference to FIG.

Reference numeral 1 denotes a cross-fin tube type cooler, which is disposed within a box body 2 together with a propeller fan 3 disposed on the air outflow side.

4 is the blade of the propeller fan, and 5 is the electric motor for the propeller fan.

Reference numeral 6 denotes a tapered annular duct arranged on the blowing side of the propeller fan 3.

Arrows indicate the direction of air flow. The air cooling device having the above structure is installed, for example, in a commercial freezer (refrigerator), and even if frost forms on the cooler 1 as the refrigeration operation progresses and the air volume of the propeller fan 3 decreases. The direction of the blown air is forced by the duct 6, and the blown air does not flow in the centrifugal direction, but is forced in the axial direction as shown.

Therefore, a backflow region that causes frost formation on the fan blades unlike in the conventional case does not occur at the center of the blowout side of the propeller fan, and frost formation on the fan is prevented.

2 and 3 show another embodiment of the duct, in which a plurality of stationary blades 7 are provided on the inner surface of a tapered duct 6 similar to the tapered duct described above.
This is what was installed.

The stationary blades 7 are installed obliquely with respect to the fan axis direction, and are provided so as to be substantially parallel to the direction of fan blown air.

This rectifies the air blown out by the fan, so the first
The pressure loss caused by the duct is improved when only the tapered duct shown in the figure is used, and the fan's air volume performance is not reduced.
Prevents frost from forming on the blade.

As explained above, according to the present invention, frost buildup on the propeller fan is prevented and the reliability of the fan is improved.In addition, frost buildup on the blades was conventionally defrosted manually, but the defrosting work It also has the advantage that it is not necessary.

[Brief explanation of drawings]

Fig. 1 is a side view of an air cooling device showing one embodiment of the present invention, Fig. 2 is a partially cutaway side view showing another embodiment of the duct, and Fig. 3 is a front view of Fig. 2. be. 1...Cooler, 3...Propeller fan, 6...Tapered duct, 7...Stator blade.

Claims (1)

[Scope of utility model registration request] A propeller fan is arranged on the air outflow side of the air cooler, and an annular tapered duct or an annular tapered duct with wings, in which a plurality of blades are installed in the duct and inclined in the direction of the blowing air flow, is arranged on the blowout side of the propeller fan. Air cooling equipment.