JPH053128Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a hot air heating machine that has a built-in ceramic grid that can serve as a far-infrared radiator, and is an improvement to the ceramic grid. be.

[Conventional technology]

As a hot air heating device of this type, this hair dryer has a built-in ceramic grid that emits far-infrared rays, which have excellent permeability to organic substances, can heat and dry substances in a short time, and are said to have a high sterilizing effect. and hot air stoves are well known.

[Problem that the invention attempts to solve]

As a means for attaching the ceramic grid for far-infrared radiation to a predetermined position on the body of a hair dryer, etc., a positioning protrusion is provided on the side of the body of the hair dryer, etc., and the protrusion fits into a part of the outer periphery of the grid. It is conceivable to provide a positioning recess.

However, ceramic grids are susceptible to drop impacts and are easily damaged, and if they are tightened too tightly, they are prone to cracking or chipping due to the tightening load. In particular, such cracking and chipping accidents are likely to occur at locations where the above-mentioned positioning recesses exist in the ceramic grid. In order to reinforce the recessed part, it is possible to partially increase the wall thickness or add ribs to the recessed part of the grid, but this would cause distortion, deformation, warping, etc. due to the difference in heat shrinkage after sintering. Easy to cause defects.

Based on this knowledge, the present invention aims to provide a ceramic grid having positioning recesses which are excellent in impact resistance.

[Means for solving problems]

This invention is based on a ceramic grid 16 for emitting far infrared rays, which is composed of vertical and horizontal grid pieces 25 and 26 integrally molded in a circular or rectangular outer frame 24 and intersecting with each other. , and then on a part or several places around the outer frame 24,
A positioning recess 22 that fits into a positioning convex part 23 provided on the body side of a hair dryer, etc. is provided, and vertical and horizontal grid pieces 25 and 26 are used to reinforce the positioning recess 22. . For this purpose, the positioning recess 22 is
It is characterized in that it is provided at or near the intersection of the vertical and horizontal grid pieces 25 and 26.

Here, the outer frame 24 is formed into a circular, square, or other shape corresponding to the body of the hair dryer or the like. The vertical and horizontal grid pieces 25 and 26 intersect not only when they intersect perpendicularly, but also when they intersect obliquely. The positioning recess 22 is formed in a V-shape, a square shape, or an arc shape, depending on the shape of a positioning projection 23 provided on the body side of a hair dryer or the like.

[Effect of idea]

According to the present invention constructed as described above, since the recess 22 for positioning the ceramic grid 16 is provided at or near the intersection of the outer frame 24 and the vertical and horizontal grid pieces 25, 26, Even when a drop impact or the like acts on the recess 22 of the grid 16, the impact stress can be dispersed to the vertical and horizontal grid pieces 25 and 26 that are directly connected to the recess 22, and as a result, the recess 2 of the grid 16
It has now been possible to effectively and reliably prevent the cracking and chipping accidents caused by 2.

〔Example〕

An embodiment of this invention applied to a hair dryer will be described with reference to FIGS. 1 to 5.

In FIG. 2, a centrifugal double-suction blower 2 is housed inside a main body case 1 made of plastic. Suction ports 3, 3 are opened on the left and right sides of the main body case 1, and a suction grill 4 made of punched metal is fitted into the suction ports 3. The main body case 1 has a built-in motor 5 for a blower 2 between the left and right suction ports 3, 3.

The main body case 1 is integrally formed with a forwardly projecting outlet 6, and a nozzle tube 7 is fitted onto the outer periphery of the outlet 6 and fixed with a set screw or the like.

The nozzle tube 7 is formed into an easy-to-grip cylindrical shape with a length extending further forward from the blow-off tube opening 6 so that it can be held and used. Furthermore, a lattice-shaped outlet grille 9 is integrally formed inside the outlet 8 at the tip of the nozzle tube 7 . A nozzle 10 serving as an attachment is removably fitted to the outer periphery of the tip of the nozzle tube 7.

A ventilation passage 11 is formed inside the air outlet 6 and the nozzle tube 7 of the main body case 1 to send air from the blower 2 to the air outlet 8. Inside this passage 11, an outer periphery of an insulating plate 12, which is cross-shaped in front view, is formed. heater 1
A heat source 14 formed by winding 3 is housed. The outer periphery of the heater 13 is covered with a metal heat shielding tube 15 to prevent any thermal influence from being exerted on the blowout tube opening 6 and the nozzle tube 7.

In the outlet 8 of the nozzle tube 7, a ceramic grid 16 for far-infrared radiation is housed between the inner surface of the outlet grille 9 and the front end of the insulating plate 12.

The ceramic grid 16 is installed in the nozzle tube 17 before the nozzle tube 7 is attached to the outlet port 6. At this time, the third
As shown in the figure, on the inner surface of the nozzle tube 7, the inner diameter A at the rear of the outlet grille 9 is the inner diameter of the outlet grille 9.
It is set larger than the inner diameter B of the part where B is present, and a stepped part 17 is provided therebetween. On the other hand, the outer diameter D of the ceramic grid 16 is set slightly smaller than the inner diameter B of the nozzle tube 7, and when it is housed inside the outlet grille 9 in the nozzle tube 7, the outer diameter of the ceramic grid 16 is A slight gap S is formed between the surface and the inner peripheral surface of the nozzle tube 7 to allow thermal expansion of the ceramic grid 16.

In order to fix the ceramic grid 16, a plastic presser ring 18 and an elastic ring 19 are prepared as shown in FIGS. 3 and 4. The retaining ring 18 has the nozzle tube 7 on its outer peripheral surface.
A step 20 for regulating the fitting depth that engages with the step 17 on the inner surface of the nozzle tube 7 is provided, and the outer diameter C on the front side of the step 20 is set to be slightly larger than the inner diameter B of the nozzle tube 7. This can be press-fitted to the rear of the ceramic grid 16 inside the nozzle cylinder 7. As the elastic ring 19, a thin corrugated leaf spring washer is used.

Thus, in order to secure the ceramic grid 16 inside the nozzle tube 7, as shown in FIG.
First, the ceramic grid 16 is attached to the nozzle tube 7 so that the front side of the grid 16 overlaps the inner surface of the blow-off grille 9 with the thin metal grid disk 21 interposed therebetween.
Insert it inside from this rear.

Next, the elastic ring 19 is placed on the outer periphery of the rear surface of the ceramic grid 16, and the presser ring 18 is pushed to a depth where the step 20 engages the step 17 on the inner circumference of the nozzle tube 7. It is press-fitted into the nozzle cylinder 7, and the elastic ring 19 is compressed by the holding load of the holding ring 18, and the grid 16 is pressed and fixed against the inner surface of the blow-off grille 9 through the grid-shaped disk 21.

At this time, in order to prevent the ceramic grid 16 from shifting its position, a positioning recess 22 is provided on a part of the outer peripheral surface of the ceramic grid 16 as shown in FIG. By fitting into the provided positioning convex portion 23, the grid 16 can be positioned and prevented from rotating. Finally, the nozzle tube 7 is fitted and fixed to the tip side of the outlet 6, whereby the grid 16 is positioned and fixed between the inner surface of the outlet grille 9 and the heat source 14 as described above.

In FIGS. 1 and 5, the ceramic grid 16 for far-infrared radiation is mainly made of alumina and contains a pigment such as black. It consists of vertical and horizontal lattice pieces 25 and 26 that are integrally molded and run vertically and horizontally and are orthogonal to each other.

The positioning recess 22 is provided in a rectangular shape at a portion where the outer frame 24 intersects with the vertical and horizontal grid pieces 25, 26. This recess 22 is formed such that the intersection point P between the extended center line S ₁ of the vertical grid piece 25 and the extended center line S ₂ of the horizontal grid piece 26 coincides with the center of the recess 22 .

More specifically, the opening width a and depth b of this recess 22 are each 1.5 mm. However, the diameter D of this grid 16 (see Figure 3) is 43.8 mm,
The thickness t (see Fig. 3) of the grid 16 is 6.5 mm, the width c of each of the vertical and horizontal grid pieces 25, 26 is 1.1 mm, and the width between the vertical grid pieces 25, 25 and the horizontal grid pieces 26, 26 is 1.1 mm. Each interval E between the two is 10mm each.
shall be. Also, the intersection P and the center O of the grid 16
The angle θ between the line S ₃ and each of the extended center lines S ₁ and S ₂ is set to 45 degrees.

When this happens, use this ceramic grid 16.
Impact loads, etc. acting on the positioning recess 22 are effectively and reliably received by the vertical grid pieces 25 and the horizontal grid pieces 26 directly connected to the recess 22, thereby obtaining the positioning recess 22 with excellent strength. was completed. In addition, the grid piece 2 around the positioning recess 22
5 and 26 can be molded to as uniform a thickness as possible without having to make them particularly thick, thereby preventing molding defects such as distortion and deformation due to differences in shrinkage after sintering.

[Another embodiment]

FIG. 6 shows another embodiment of the present invention showing a modification of the positioning recess 22 of the ceramic grid 16, in which the positioning recess 22 is offset to the outside of the intersection P of the vertical and horizontal grid pieces 25 and 26. It is formed in a V shape.

FIG. 7 further shows another embodiment of the present invention,
Recess 22 for positioning ceramic grid 16
is formed into a semicircle. The center O ₁ of the semicircle coincides with a point on the outer periphery of the outer frame 24, and the vertical and horizontal grid pieces 25 and 26 are provided to connect tangentially to the semicircular frame 22a of the semicircular recess 22. It becomes. Furthermore, vertical and horizontal grid pieces 2 in the tangential direction
5 and 26, the vertical and horizontal grid pieces 25a and 26a adjacent to these are the outer periphery of the outer frame 24 and the semicircular frame 22a.
They are arranged so as to pass through the intersection P with Therefore, the impact load acting on the positioning recess 22 is received by the vertical and horizontal grid pieces 25 and 26 in the tangential direction, and also by the vertical and horizontal grid pieces 25a and 26a passing through the intersection P, resulting in poor impact resistance. It will become even better.

FIG. 8 shows a further different embodiment, in which the vertical and horizontal grid pieces 25 and 26 of the ceramic grid 16 are diagonally crossed to form a diamond-shaped ventilation hole 27, and a part of the outer frame 24 has a V Shape positioning recess 22
It forms. In this case, with respect to the vertical and horizontal grid pieces 25 and 26 constituting the recessed portion 22, the vertical and horizontal grid pieces 25a and 26a adjacent thereto are located at the intersection point P between the outer periphery of the outer frame 24 and the vertical and horizontal grid pieces 25 and 26. It is preferable to arrange them so that they pass through each other.

FIGS. 9a and 9b show yet another embodiment, in which the positioning recesses 22 of the ceramic grid 16 are provided not only at one location on the circumference of the outer frame 24, but also at two or four points symmetrically. It will be set up. According to this, the fitting direction to the positioning convex portion 23 on the body side is not specified in one direction, making it easier to assemble, and also being advantageous in preventing shrinkage distortion during sintering.

FIG. 10 shows another embodiment of the overall shape of the ceramic grid 16, in which the entire grid is formed into a square shape, and the positioning recess 22 is provided at one of the projecting corners.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the hot air heating device according to this invention. Figure 1 is a front view of the main part of the ceramic grid, and Figure 2 is a partially cutaway view of the hair dryer. 3 is an enlarged sectional view of the blowing part, FIG. 4 is an exploded perspective view of the main parts of the hair dryer, and FIG.
It is a sectional view taken along the V line. 6 to 10 show different embodiments of the present invention, and FIG.
8 through 8 are front views of the main parts of the ceramic grid, and FIGS. 9a, b, and 10 are front views of the entire ceramic grid. 16... Ceramic grid, 22... Positioning recess, 23... Positioning protrusion, 24...
Outer frame, 25, 26... Vertical and horizontal lattice pieces.

Claims (1)

[Claims for Utility Model Registration] In a hot air heating machine with a built-in ceramic grid 16 for emitting far infrared rays, the ceramic grid 16 runs vertically and horizontally inside an outer frame 24 and intersects with each other. It consists of vertical and horizontal grid pieces 25 and 26 that are integrally molded in a shape, and is provided at the intersection of the outer frame 24 and the vertical and horizontal grid pieces 25 and 26 or near this intersection for positioning on the body side of a hair dryer, etc. A hot air heating machine characterized by being provided with a positioning recess 22 that fits into a protrusion 23.