JPS5838355Y2 - Onpuusouchi - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hot air device that uses a heating element made of positive characteristic porcelain having a large number of through holes as a heat source.

Heating elements made of positive characteristic porcelain have been known for a long time, and recently, as shown in FIG. It is possible to obtain a large amount of heat by combining with the heating element 1.
Hot-air devices that utilize the property of controlling their own heat generation by their own resistance-temperature characteristics (see Figure 2) have been commercialized and are known from Japanese Patent Application Laid-Open No. 114130/1983. be.

In such a hot air device, the heat exchange efficiency of the heating element 1 becomes a problem, and if only the improvement of the heat exchange efficiency of the heating element 1 is considered, it is necessary to create many through holes 2 with the smallest possible diameter. , 2... can improve the heat exchange efficiency by increasing its surface area, but on the other hand, if the diameter of the through hole 2゜2... becomes smaller, Dust contained in the blown air was likely to adhere, leading to clogging of the through holes 2, 2, . . . .

However, in any conventional hot air device, the heating element 1
are arranged in a fixed state, it is difficult to remove and clean the heating element 1, and therefore the through holes 2, 2...
. . had to be made larger in diameter to prevent dust from adhering as much as possible, resulting in a decrease in heat exchange efficiency.

The present invention has been devised in view of this point, and is designed to effectively remove dust adhering to the through holes 2, 2, etc. of the heating element 1 by using the force of the air blower. It is.

The embodiment of the present invention shown in FIGS. 3 to 5 will be described in detail below.

The heating element 1 has a disc shape with a large number of through holes 2, 2, etc. in the axial direction, that is, the shape as shown in FIG. are doing.

Further, the heating element 1 is provided with electrode plates 5, 5 projecting from both sides of the support shaft 3 in the same direction as the support shaft 3.

A blower 8 is arranged in a ventilation passage 7 formed inside the wind body 6,
The heating element 1 is mounted on the support shafts 3 and 4 at the rear stage of the blower 8.
The heating element 1 is rotatably supported by the fan 8 in the direction of air blowing by the blower 8.
. . . so that the openings at both ends can be selectively opposed to each other.

In addition, on the support shaft 3 side of the wind cylinder 6, the shaft 3 and the electrode plate 5,
A through hole 9 is bored through which both the electrode plates 5 and 5 are inserted, and the support shaft 3 is supported on the bearing 10 through the through hole 9, and the electrode plates 5, 5 are exposed to the outside.

The electrode plates 5, 5 come into contact with the power supply plates 11, 11 only when the heat generating element 1 is in a predetermined position, so that power can be supplied to the heat generating element 1.

Further, the support shaft 4 has a disk portion 12 at the end located outside the wind cylinder 6.
The peripheral edge of this disk portion 12 has a 180° angle.
Two pins 13 and 13' are provided protrudingly spaced apart from each other.

The operating shaft 14 is pivotably mounted on a mounting bracket 15 fixed to the wind cylinder 6 so as to be freely rotatable and movable in the axial direction, and its center of rotation coincides with the center of rotation of the heating element 1.

A heir 16 is attached to the outer end of this operating shaft 14, and a connecting rod 17 having a notch 18 that selectively engages with the pin 13, 13' is attached to the inner end. At the same time, an operating rod 20 for opening and closing a power switch 19 that controls power supply to the heating element 1 and the blower 8 is attached to the outer end side of the connecting rod 17.

Furthermore, this operating shaft 14 is urged outward by a spring 21 such as a coil spring or a plate spring that is compressed between the mounting bracket 15 and the eldest child 16, and is moved in the axial direction against this spring 21. Only when the heating element 1 rotates in this state, the heating element 1 is rotated in conjunction with the engagement of one of the pins 13, 13' with the notch 18 of the connecting rod 17.

Note that the elastic locking piece 22 has one end fixed to the outer peripheral surface of the wind barrel 6,
The other end is selectively engaged with two recesses (not shown) provided on the outer peripheral surface of the disk portion 12 of the support shaft 4, and the heating element 1 is engaged with the recesses. Hold it in place.

In addition, the power supply plate 11.11 is the fifth
As shown in the figure, the operating rod 20 is configured to be long so as to come into contact with the electrode plates 5, 5 from before 180°, and is attached to the operating shaft 14 so as to close the power switch 19 when the operating rod 20 rotates 180°. It is.

Next, its effect will be explained.

Now, press the heir 16 to move the operating shaft 14 in the axial direction against the spring 21, and rotate the heir 16 180° clockwise with the notch 18 of the connecting rod 17 engaged with the pin 13. When operated, the heating element 1 also rotates 180° clockwise so that the side A faces downwind and the side B faces upwind, and the heating element 1 and the blower 8 rotate together with the operating shaft 14. When the power switch 19 is closed by the rod 20, electricity is supplied.

At this time, the electrode plates 5, 5 of the heating element 1 come into contact with the power supply plate 11, 11 before the end of the rotation operation, and the power switch 19 is connected to the operating shaft 14.
It is closed by the operating rod 20 at the end of the rotation operation.

Then, the air forcibly blown by the blower 8 absorbs heat from the heating element 1 when passing through the through holes 2, 2, etc. of the heating element 1 and becomes warm air, which is then discharged into the room, for example. This will contribute to heating.

Next, when stopping the operation, rotate the heir 16 counterclockwise without pressing it (the engagement between the notch 18 of the connecting rod 17 and the pin 13 is released), and the operating shaft 14 will generate heat. It rotates independently of the body 1, and this rotation opens the power switch 19 by the operating rod 20, cutting off the electricity to the heating element 1 and the blower 8.

Then, when the eldest child 16 is pressed and rotated 180° clockwise in order to start operation again, the notch 18 of the connecting rod 17 engages with the pin 13', and the heating element 1 is rotated to rotate the side surface A.
will face upwind, and side B will face downwind.

In other words, the side surface B, which faced the windward side when it was used last time, now faces the leeward side. When the dust contained in the side surface B has adhered to it, now that the side surface B is facing downwind, the dust that has adhered to the opening on the side surface B side is removed by the air passing through the through holes 2, 2... It will be easily detached and removed.

According to the above-mentioned embodiment, the dust attached to the heating element 1 during the previous use can be removed each time it is used, and the clogging of the through-holes 2, 2, etc. will continue to progress. Therefore, even if we increase the heat exchange efficiency of the heating element by forming many through holes with the smallest possible diameter and increasing the surface area, there will be no inconvenience or inconvenience like in the past. .

Incidentally, in the above-described embodiment, a better result can be achieved if the heating element is rotated to give some impact to the heating element so as to shake off the attached dust.

Alternatively, a timer or the like may be used to selectively move the openings at both ends of the through hole of the heating element to face the air blowing direction at predetermined time intervals, without interlocking with the operation start operation of the warm air device.

According to the present invention as described above, in a hot air device comprising a heating element made of positive characteristic porcelain having a large number of through holes and an air blower that forcibly blows air to the heating element, the heating element is supported by a support shaft. The heating element is rotatably supported on the wind cylinder, and the openings at both ends of the through hole of the heating element can be selectively opposed to the direction of air blowing by the blower by means of an operating shaft provided on the wind cylinder. Therefore, the dust adhering to the through holes of the heating element can be effectively removed using the air blowing force of the blower, which not only eliminates the troublesome work of removing and cleaning the heating element, but also eliminates the need for removing and cleaning the heating element. By forming many through holes with the smallest possible diameter to increase the surface area, it is possible to obtain a hot air device that can be operated efficiently for a long period of time without clogging. Since the power supply operation to the heat generating element by the plate and the electrode plate of the heat generating element is performed before the power supply operation to the power supply plate, the power supply is effective against the rush current when power is supplied to the heat generating element. By determining the time order, the burden can be placed on the relatively selectable power switch, and the electrode plate and power supply plate, which are movable and are therefore unsuitable for switching on and off large currents, can be protected.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a heating element made of positive characteristic porcelain;
The figure is a resistance-temperature characteristic diagram of the heating element, Figure 3 is a cross-sectional plan view showing the proposed hot air device, Figure 4 is a configuration diagram showing the main parts of the device, and Figure 5 is a side view of the main parts of the device. It is. 1: Heating element, 2: Through hole, 5: Electrode plate, 7: Ventilation path, 8
: Blower, 11: Power supply board.

Claims (1)

[Scope of utility model registration request] A hot air device is equipped with a heating element made of positive characteristic porcelain having a large number of through holes, and an air blower that forcibly blows air to the heating element, and the heating element is rotatably mounted on a wind cylinder by a support shaft. The heating element is supported so that openings at both ends of the through hole of the heating element can be selectively opposed to the air blowing direction by the blower by means of an operating shaft provided in the wind cylinder, and a power switch provided in the wind cylinder. A power supply plate connected to the electrode plate of the heating element at a selected position is provided on the wind barrel, and the power supply plate is connected to the electrode plate with an operating rod that closes the power switch of the contact liquid at the selected position. , and when the operating shaft selects a selection operation, the operation of supplying power to the heating element by the power supply plate and the electrode plate of the heating element is performed before the operation of supplying power from the power switch to the power supply plate. Features a hot air device.