JPH0240440Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an air heater, which has strong impact resistance, less heat radiation due to thermal conduction, and improved thermal efficiency, and has a jet nozzle with a different diameter at the tip opening that jets out heated air. It is possible to provide an air heater that can be easily replaced.

Conventionally known air heaters are used for molding processes such as welding, bending, cutting, coating and sealing of thermoplastic resins, melting of contents related to food and cosmetics, drying of insulation materials and coatings, and various types of soldering. Although it has been applied in many fields such as attaching and removing solder, the heating element of these air heaters was generally made of nichrome wire. However, although heating elements made of nichrome wire have sufficient strength against vibration and shock, they deteriorate due to oxidation, so
Particularly when heated in an acidic atmosphere, it cannot withstand long-term use, requires time and effort to replace the heating element, and has the disadvantage of being expensive.

Therefore, there was a desire for an air heater that uses a ceramic heating element, which has advantages such as excellent chemical resistance and abrasion resistance, rapid temperature rise, and high thermal emissivity. Until now, it has not been applied to air heaters because the body has the disadvantage of being weak against vibrations and shocks.However, as a result of various experimental studies, the inventor of the present invention has found that it does not have these disadvantages, has high shock resistance, and is also heat resistant. We have devised an air heater that has high thermal efficiency with little heat radiation due to conduction, and can be obtained by easily replacing the jet nozzle with a different diameter at the tip opening that jets heated air.

In the present invention, a plug body is removably locked to the upper opening of a ventilation hole formed in a support tube, a blower pipe is attached to the plug body, and a jet nozzle is removably hung in the lower opening of the ventilation hole. Then, a rod-shaped heating element made of ceramics having two lead wires is inserted into this jet nozzle, and the two lead wires are led out through the insertion hole formed in the support tube, and the rod-shaped heating element is inserted into the jet nozzle. This 2
A separator having elasticity is inserted between the inner surface of the ejection nozzle and the outer surface of the rod-shaped heating element, and the rod-shaped heating element is suspended by a main lead wire within the ejection nozzle. The air heater is held within the jet nozzle and has a ventilation passage formed between the jet nozzle and the rod-shaped heating element.

Next, an embodiment of the present invention will be explained with reference to FIGS. 1 and 2. Figure 1 is a cross-sectional view, Figure 2 is A of Figure 1.
- A cross-sectional view taken along the line A, in which a blower pipe 5 is attached to a stopper 4 that is removably engaged with an upper opening 3 of a ventilation hole 2 formed in a support tube 1, and a blower pipe 5 is attached to a plug 4 that is removably attached to a lower opening 6 of the ventilation hole 2. A cylindrical ceramic rod-shaped heating element 8 is inserted into the vertically installed jet nozzle 7, and has elasticity made of a coiled spring with one end held inside the jet nozzle 7 and the other end circumscribed around the rod-shaped heating element 8. Inserting the separator 9 between the jet nozzle 7 and the rod-shaped heating element 8,
The rod-shaped heating element 8 made of ceramic is held within the jet nozzle 7 by this separator 9, and a ventilation passage 10 is formed between the inner surface of the jet nozzle 7 and the outer surface of the rod-shaped heating element 8, and the rod-shaped heating element 8 is A lead wire 11 connected to the body 8 is led out through an insertion hole 12 formed in the support tube 1. In the figure, 13 indicates a wire 13 with the lead wire 11 attached to the rod-shaped heating element 8.
A support rod 14 is suspended within the mounting plate 1 having a mounting hole 15 for removably locking the lower part of the support tube 1.
6 is an O-ring, 17 is an inner hole, and 18 is an exhaust port.

The cylindrical ceramic heating element applied to the rod-shaped heating element 8 is, for example, a resistance heating element printed on the surface of an alumina cylindrical body, an alumina insulating protective layer layered on the outer surface, and integrally sintered at high temperature. It can be used safely in any atmosphere.

In the present invention, when the lead wire 11 is connected to a power source, the rod-shaped heating element 8 is brought into a heating state, and air or other appropriate gas is blown through the blast pipe 5, the outer circumference of the rod-shaped heating element 8,
It is heated by the inner hole 17 and is ejected from the exhaust port 18 at the end of the ejection nozzle 7.

Since the air heater of the present invention is constructed as described above, the amount of air flowing into the ventilation hole 2 can be adjusted by replacing the stopper 4 with the blower pipe 5 having a different inner diameter, and the blowing nozzle can be adjusted. The amount of heated air discharged from the exhaust port 15 of 7 can be adjusted, and the outer periphery of the rod-shaped heating element 8 is heated by the separator 9 inserted between the jet nozzle 7 and the rod-shaped heating element 8 The ventilation path 10 is secured to prevent contact between the jet nozzle 7 and the rod-shaped heating element 8 due to vibrations, etc., so that heat conduction due to contact between the two does not occur, and external shocks are prevented from impacting the separator 9. It is absorbed by elasticity and cannot be applied directly to the rod-shaped heating element 8, effectively preventing damage to the rod-shaped heating element 8, and furthermore, it can be easily removed by pulling out the jet nozzle 7 downward from the support tube 1. The two can be separated, and the two can be combined by pushing the jet nozzle 7 from below, and the jet nozzle 7 of a different diameter at the lower end exhaust port 18 can be easily replaced.
Furthermore, when replacing the jet nozzle 7, the rod-shaped heating element 8 inserted inside can be replaced with a rod-shaped heating element 8 having a different heating capacity, and the air forced through the air pipe 5 is replaced by a large-diameter ventilation. It flows into the hole 2, becomes a steady flow, and flows into the jet nozzle 7,
This allows heated air to flow uniformly through the jet nozzle 7 without any unevenness and can be jetted out from the exhaust port 18.

Next, another embodiment of the present invention will be explained with reference to FIGS. 3 and 4. FIG. 3 is a partial sectional view of another embodiment, and FIG. 4 is a sectional view taken along the line B-B in FIG. 3. As the rod-shaped heating element 8, a columnar ceramic heating element without an inner hole obtained in the same manner as in the above embodiment is used, and as the separator 9, a heat-resistant and elastic block made of asbestos, rock wool, etc. is applied. The parts having the same reference numerals as those in the embodiment described above are constructed in the same manner as in the embodiment described above, and the functions and effects are the same as in the embodiment described above.

Rod-shaped heating element 8 shown in the above two embodiments
The heat exchange effect can be improved by forming a plurality of longitudinal protrusions on the outer peripheral surface of the inner hole 17 and the inner hole 17 to increase the surface area.

[Brief explanation of the drawing]

Fig. 1 is a sectional view, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, Fig. 3 is a partial sectional view of another embodiment, and Fig. 4 is a sectional view taken along the line B-B in Fig. 3. be. DESCRIPTION OF SYMBOLS 1... Support cylinder, 2... Ventilation hole, 3... Upper opening, 4... Plug, 5... Air pipe, 6... Lower opening, 7... Spray nozzle, 8... Rod-shaped heating element, 9 …
... Separation body, 10 ... Ventilation path, 11 ... Lead wire,
12...Insertion hole.

Claims (1)

[Claims for Utility Model Registration] (1) A plug body 4 is removably locked in the upper opening 3 of the ventilation hole 2 formed in the support tube 1, a blower pipe 5 is attached to the plug body 4, and the ventilation A jet nozzle 7 is removably installed vertically in the lower opening 6 of the hole 2, and a rod-shaped ceramic heating element 8 having two lead wires 11 is inserted into the jet nozzle 7, and the two lead wires are inserted into the jet nozzle 7. 11 to the outside through the insertion hole 12 formed in the support cylinder 1, and the rod-shaped heating element 8 is inserted into this 2.
A separator 9 having elasticity is inserted between the inner surface of the ejection nozzle 7 and the outer surface of the rod-shaped heating element 8, and is suspended inside the ejection nozzle 7 by a lead wire 11. The rod-shaped heating element 8
is held in the jet nozzle 7, and a ventilation passage 10 is formed between the jet nozzle 7 and the rod-shaped heating element 8. (2) Utility model registration claim 1, in which the rod-shaped heating element 8 made of ceramics is cylindrical or columnar.
Air heater as described in section. (3) The scope of the utility model registration claim in which the separator 9 is a block made of a coiled spring, asbestos, or rock wool, etc., with one end inscribed in the jet nozzle 7 and the other end circumscribed in the rod-shaped heating element 8 made of ceramics. The air heater according to the first description.