JP2545327B2 - Multiple type air heater - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a multiple type air heater,
In particular, the present invention relates to a multiple air heater used for heating during deburring of plastic products, welding of plastics, soldering of ICs, sealing of containers for paper packs, and the like.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional multiple type air heater, in which 1 is a common air supply pipe, 2 is a plurality of cylindrical heater units arranged along the axial direction of the air supply pipe 1 and spaced from each other. Reference numeral 3 is a pipe for communicating between each heater unit and the common air supply pipe 1, and 4 is an air flow rate control valve inserted in the conduit of the common air supply pipe 1.

Each of the heater units 2 has openings at both ends, for example, an outer diameter of 15 mm, an inner diameter of 12.5 mm, and a length of 70 mm.
Of the transparent quartz tube 5 and a heater element 6 of iron-chromium-aluminum system, nichrome system or platinum system arranged in the quartz tube 5, and for example 2 kg / cm ^{2 in the} air supply pipe 1.
The air sent at the following pressure is heated by the heater element 6 when passing through the quartz tubes 5, and becomes hot air from the outlet of each quartz tube 5 at, for example, 800 ° C. and 50 liters / minute, and is processed as shown by the arrow. It is radiated to objects.

[0004]

However, it has been found that in such a conventional multiple-type air heater, the life of each heater unit 2 is not the same but various.

As a result of various experiments and researches, the present inventor has found that in the conventional multiple air heater, the fourth heater farthest from the first heater unit 2 located closest to the air supply side of the air supply pipe 1. Up to the heater unit 2, the amount of air blown into each heater unit 2 should be almost the same, but in reality, 3/4 of the total flow of air crosses the inlet of the first heater unit 2 at a substantially right angle. Causes a suction phenomenon,
Since the actual amount of air entering the first heater unit 2 is greatly reduced, the heater element 6 in the first heater unit 2 becomes hot and causes an early disconnection. It was found to be similar.

In addition to the above reasons, the resistance value of the heater element 6 is actually different for each heater unit.
It has been found that it is difficult to equalize the temperature of the hot air emitted from each heater unit 2 because the size and the ventilation resistance of the quartz tube 5 vary. Also, the actual exploitation 54-27
Japanese Patent No. 545 discloses that a damper is used to adjust the air volume.
Although shown, each such heater may not
-Fine adjustment to make the air volume to the unit 2 the same
Knots turned out to be totally impossible.

The present invention is based on the above findings.

[0008]

[Means for Solving the Problems] Multiple-type air heater of the present invention
Is a common flue along the axial direction of this flue.
Multiple heater units arranged separately from each other
And between these tubular heater units and the air pipe
And the flow rate of air to each of the above pipes
This flow controller consists of a flow control mechanism for saving
The structure is screwed into the wall of each pipe so that it projects into each of the above pipes.
Adjustment screw, and at least the difference in the arrangement position
Air flow through each individual heater unit caused by
It is characterized in that the difference between can be corrected. Also,
The multiple air heater of the present invention includes a common air supply pipe, a plurality of tubular heater units arranged apart from each other along the axial direction of the air delivery pipe, and between each of the tubular heater units and the air delivery pipe. And a flow rate adjusting mechanism for adjusting the flow rate of air to each of the above pipes, and this flow rate adjusting mechanism is provided at the inlet opening of each of the above pipes.
In order to allow the tip to move in the direction of contact and separation, use the common
It is characterized in that it comprises an adjusting screw screwed to the wall of the air supply pipe, and is capable of compensating for at least the difference in the amount of air passing through the individual heater units caused by the difference in the arrangement position.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIG. 1, each pipe 3 for connecting between the common air supply pipe 1 and each heater unit 2
The flow rate adjusting screw 7 having a diameter of, for example, 5 mm, which can reduce the cross-sectional area in the pipe 3, is screwed into the pipe 3, and the flow rate adjusting screw 7 is adjusted to adjust the flow rate adjusting screw 7 to the pipe 3 of the first to fourth heater units 2. The difference in the amount of air passing through each heater unit caused by the difference in the array position with respect to is corrected.

Further, when the actual hot air temperatures from the outlets of the heater units 2 are not equal to each other due to the above variations, the flow rate adjusting screw 7 is further finely adjusted.

FIG. 2 shows another embodiment of the present invention. In this embodiment, each of the flow rate adjusting screws 7 is attached to the common air supply pipe 1.
It is provided at a position corresponding to each of the above-mentioned pipes 3, so that the cross-sectional area of the inlet of each of the above-mentioned pipes 3 can be adjusted.

[0013]

Since the multiple air heater of the present invention is constructed as described above, the temperature of the hot air from each heater unit can be set to a desired constant value regardless of the arrangement position of each heater unit and the variation in the characteristics of each part. There is a great benefit of being able to adjust the value and prolong its life.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a multiple air heater of the present invention.

FIG. 2 is a vertical cross-sectional view showing another embodiment of the multiple air heater of the present invention.

FIG. 3 is a vertical sectional view showing a conventional multiple air heater.

[Explanation of symbols]

 1 Air Supply Pipe 2 Heater Unit 3 Piping 4 Air Flow Control Valve 5 Quartz Pipe 6 Heater Element 7 Flow Control Screw

Claims (2)

(57) [Claims] 1. A common air pipe and an axial direction of the air pipe.
A plurality of cylindrical heater units arranged along the distance from each other.
Between each of these individual heater units and the air line
And the flow rate of air to each of the above pipes.
The flow rate adjustment mechanism for adjusting
The knot mechanism is screwed into the wall of each pipe so that it projects into each of the above pipes.
It consists of a matching adjusting screw,
Pass through each heater unit caused by the difference
Multiple stations characterized by being able to correct the difference in air volume
Type air heaters. 2. A common air supply pipe, a plurality of individual heater units arranged along the axial direction of the air supply pipe so as to be spaced apart from each other, and pipes for communicating between each of the tubular heater units and the air supply pipe. And a flow rate adjusting mechanism for adjusting the flow rate of air to each of the pipes, and the flow rate adjusting mechanism has its tip separated from and in contact with the inlet opening of each of the pipes.
It is screwed to the wall of the common air pipe so that it can move in any direction.
It was made of the adjustment screw, multiple-type air heater, characterized in that to be able to correct the difference between the amount of air passing through each 箇状 heater unit caused by differences in at least that sequence position.