JPS5844245Y2 - Hot air machine - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a hot air fan equipped with a heating element made of a positive temperature coefficient thermistor having a plurality of ventilation holes formed through both the front and back sides.

In general, this type of heating element (1) has a large heat dissipation area and a large amount of heat dissipation per unit volume, (2) there is no risk of overheating due to its self-temperature control characteristics, and (3) there is no effect of room temperature on the exhaust air temperature. (4) The amount of heat generated can be controlled by the amount of air, so it can be used as a heat source for hot air blowers.

However, among these features, the ability to control the amount of heat generated by the air volume is that the exhaust air temperature remains constant regardless of the exhaust air volume, so it is not possible to directly incorporate it into products that require a constant air temperature. However, if you want to change the air temperature, you need a means to do so, and in order to increase the heat density of such a heating element, you need to increase the wind speed, so the pressure loss is large. If all of the exhaust air is passed through, there is a drawback that the air volume cannot be increased even when using cold air that does not require heating.

This idea eliminates the above drawbacks by providing an auxiliary ventilation duct that bypasses the heating element in the ventilation duct where the heating element is installed, and by changing the amount of ventilation in this auxiliary ventilation duct. The purpose is to provide a hot air fan that can vary the temperature.

This invention will be described below with reference to the illustrated embodiment. Reference numeral 1 denotes a main body having an intake port 2 on the rear surface and an exhaust port 3 on the front surface, and houses a blower 4 inside.

Reference numeral 5 denotes a heating element which is made of a flat positive temperature coefficient thermistor and has a large number of ventilation holes 6 formed through the front and back surfaces thereof, and is attached to the main body 1 at the exhaust port 3 thereof.

Reference numeral 7 denotes a hood that is fitted onto the outer periphery of the exhaust side of the main body 1 so as to be able to move back and forth and expands toward the tip, and forms an auxiliary ventilation passage 8 between the hood and the main body 1.

Reference numeral 9 denotes an inlet of an auxiliary ventilation passage 8 provided on the peripheral surface of the main body 1 closer to the blower than the heating element 5 and on the fitting surface with the hood 7.

In the above configuration, when the blower 4 is operated, the air that enters the main body 1 from the intake port 2 passes through each ventilation hole 6 of the heating element 5 and is discharged to the public area. , a part of the air enters the auxiliary ventilation passage 8 through its suction port 9 and is directly discharged to the outside without passing through the heating element 5.

When the hood 7 is in the position shown by the chain line in the figure, the suction port 9 is closed by the hood 7 by its width t, so all the air is exhausted through the ventilation holes 6 of the heating element 5, and the hood 7 is located between the two, the width 11 of the suction port 9 is narrowed, and the amount of air discharged through each ventilation hole 6 of the heating element 5 can be adjusted as desired.

Therefore, when the heating element 5 is energized in such a state, as the hood 7 is moved and the suction port 9 of the auxiliary ventilation path 8 is closed, the amount of hot air blown gradually decreases and the temperature thereof gradually increases.

Therefore, by arbitrarily moving the position of the hood 7,
It becomes possible to obtain the desired air volume and air flow according to the preset air temperature-air volume characteristics.

Here, the auxiliary ventilation path 8 shown in "-"2 is one that branches from the upstream side of the heating element 5 of the ventilation path of the blower 4 and merges with the downstream side, and in the above embodiment, this is provided using the hood 7. It is.

In addition, this hood 7 is movably fitted to the middle circumference of the main body 1 to adjust the opening area of the auxiliary ventilation passage 8 and to adjust the opening area of the auxiliary ventilation passage 8.
It functions as an air flow rate control valve that adjusts the flow rate of air bypassed from the air.

The present invention is not limited to the above-mentioned embodiments of the auxiliary ventilation passage 8 and the air flow control valve. For example, an auxiliary ventilation passage may be provided by providing piping in the main body 1, and a damper or the like may be used to adjust the opening area of this ventilation passage. may be provided.

Further, according to the above configuration, there is an advantage that the amount of air can be increased when using cold air that does not require heating.

As mentioned above, this invention is based on providing an auxiliary ventilation path in the ventilation path where the heating element is installed, which bypasses the heating element, and adjusting the amount of ventilation in this auxiliary ventilation path. The air volume and air temperature can be adjusted arbitrarily while taking advantage of the characteristics of the heating element made of a characteristic thermistor.
It can provide a very useful hot air fan.

[Brief explanation of the drawing]

The figure is a longitudinal sectional view showing an embodiment of this invention. 1 is the main body, 4 is a blower, 5 is a heating element, 7 is a hood, 8 is an auxiliary ventilation path, and 9 is a suction port.

Claims (1)

[Scope of utility model registration request] A heating element made of a positive temperature coefficient thermistor with a plurality of ventilation holes penetrating through both the front and back surfaces is provided in the ventilation path of the blower, and an auxiliary ventilation path is provided that branches from the upstream side of the heating element in the ventilation path and merges with the downstream side. What is claimed is: 1. A hot-air fan comprising: an air flow rate control valve that adjusts the opening area of the auxiliary ventilation passage to adjust the amount of air that bypasses the ventilation passage;