JPS6113875Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a hot air generation unit that discharges hot air, and in particular, the hot air discharge port is flattened, the temperature of the hot air can be freely varied high or low, and the temperature unevenness of the hot air that can be discharged is reduced. This provides a hot air generating unit with a large amount of air flow.

An example of the present proposal will be explained below with reference to the diagram.
1 is a hot air generator main body, which has a wind tunnel 3 disposed in a case main body 2, a blower fan 4 connected to the wind tunnel, and a plurality of positive temperature characteristics as heat sources provided in the wind tunnel 3. The structure is such that air is blown to the resistance elements 5, 5. An air suction port 7 is bored in the rear wall 6 of the case body 2 facing the blower fan 4 so that the sucked air is introduced into the wind tunnel 3 and the air is introduced into the resistance element 5. .
The wind tunnel 3 has a tapered part 8, which is an air outlet, formed into a flat pipe, and a ceiling wall 9 formed into an inclined surface 10 whose height increases gradually as it goes rearward. An opening 11 is formed so that the air sent from the blower fan 4 is sequentially constricted and released by the inclined surface 10 as it goes toward the tip.

In the expanded portion 11 of the wind tunnel 3, a plurality of positive temperature characteristic resistance elements 5, 5', which serve as heat generation sources, are vertically arranged in the height direction. The positive temperature characteristic resistance elements 5, 5' have plate-shaped resistance element plates 12, 12, . Board 13, 13
Each of these resistance element plates 1
2, 12... generate heat to warm the air passing through the large number of ventilation passages S, S... formed by the resistive element plates. A gap 14 is formed between the vertically arranged positive temperature characteristic resistance elements 5, 5' to allow cold air to pass through without exchanging heat with the positive temperature characteristic resistance elements 5, 5'.
By varying the size of this gap 14, the temperature of the hot air discharged from the tapered portion 8 can be finely adjusted. That is, if the gap 14 is made larger, the amount of cold air passing through will increase and the temperature of the hot air discharged will drop slightly, whereas if the gap 14 is made smaller, the temperature will rise slightly.

The positive temperature characteristic resistance elements 5 and 5' can be energized and generate heat simultaneously or individually. In particular, the positive temperature characteristic resistance element 5 in the lower position is always energized, and the positive temperature characteristic resistance element 5' in the upper position can be selectively energized. For example, if high temperature hot air is to be obtained from the tapered portion 8, the upper and lower positive temperature characteristic resistance elements 5, 5' are energized, and if low temperature hot air is to be obtained, current is energized. In this case, the current supply to the positive temperature characteristic resistance element 5' at the upper position is cut off.

In this case, the cold air that has passed through the element 5' at the upper position hits the slope 10 formed on the ceiling wall 9 of the wind tunnel 3 and is lowered along it, and mixes efficiently with the hot air that has passed through the element 5 at the lower position, resulting in a temperature drop. Even hot air is emitted from the tapered portion 8. Such energization control is performed by a switch 15 mounted on the outer surface of the case body 2. Since these positive temperature characteristic resistance elements 5 and 5' are arranged vertically, the flow resistance of the air is extremely small since it only passes through a single element, and the temperature velocity from the tapered portion 8 is large.

Therefore, hot air is blown into a hollow flat plate substrate 16, for example, as shown in the drawing, which is detachably attached to the tapered part 8 of the hot air generator main body 1, and the flat plate substrate 16 is
In the case where warm air is emitted from the through holes 18, 18... bored in the top wall 17, the hollow flat plate substrate 16 is filled with hot air under high pressure, and the hot air is extremely efficiently discharged from the entire surface. Can be released. Furthermore, it is more effective if an air permeable mat member 19 having a high flow resistance is superposed on the upper wall 17 of the flat substrate 16. Of course, the tapered portion 8 of the hot air generator main body 1 is also a flat tube in accordance with the flat plate substrate 16, and effects such as simplifying the appearance treatment of the connecting portion can be obtained.

As mentioned above, the hot air generating unit of the present invention has a wind tunnel disposed inside the case body, the rear end of which is an expanded part, and the tip of which is a tapered part, and the ceiling wall is made into an inclined surface. A plurality of positive temperature characteristic resistance elements each having a large number of ventilation passages are arranged vertically in the height direction, and the resistance element at the lower position is always energized, while the resistance element at the upper position is selectively controlled. To provide a hot air generating unit which can not only freely control the temperature, but also mix cold air and hot air well within the unit especially when the temperature is low, and obtain efficient hot air without uneven mixing.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the hot air generating unit according to the present invention, and FIG. 2 is an enlarged perspective view of the main parts. 3... Wind tunnel, 8... Tapered part, 10... Inclined surface,
5, 5'...Positive temperature characteristic resistance element, 11... Expansion part.

Claims (1)

[Scope of utility model registration request] The wind tunnel is arranged inside the case body, and the ceiling wall is sloped so that the rear end is an expanded part and the tip is a tapered part. A hot air generating unit comprising a plurality of resistance elements arranged vertically in the height direction, and the resistance element at the lower position is always energized and the resistance element at the upper position is selectively controlled.