JPH01312355A - Hot air blowing type foot warmer unit - Google Patents

Abstract

PURPOSE:To provide a uniform blowing of hot air and increase an efficiency of air blowing operation by a method wherein a protection guard having a suction hole at a central part of a bottom plate and having some discharging holes at an outer circumference of the bottom plate is provided and the discharging holes are arranged concentrically around a rotating shaft of a motor at positions opposing to air guiding portions. CONSTITUTION:A bottom surface is provided with a plurality of auxiliary holes 25, air suction holes 26 and discharging holes 27 are concentrically arranged in sequence from a central part to an outer circumference around a position opposing to a rotating shaft 14 of a motor. The discharging holes 27 are concentrically arranged with the rotating shaft 14 of the motor and opposed to a circular circumference edge 9 of the air guiding part 10, resulting in that air generated by a fan 15 is uniformly and concentrically collected and further a discharging of warm air can be performed quite uniformly and smoothly. Since longitudinal directions of the discharging holes 27 are inclined in respect to a rotating direction of the fan 15, so the longitudinal directions and the air discharging directions are coincided with each other, a resistance in case of discharging air is reduced and an amount of discharged air is increased. Due to this fact, an air circulation within or out of the unit 1 is made smooth and a thermal efficiency of the unit 1 is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a hot air type kotatsu unit, and is particularly intended to improve the blowing of hot air.

(B) Conventional technology Conventionally, this type of hot air type kotatsu unit has been provided with a protective guard with a rectangular bottom on the bottom surface of the unit, as shown in, for example, Japanese Utility Model Publication No. 62-25633. An intake hole is provided on the center side, and a discharge hole is provided on the outer peripheral side.

However, the discharge holes are arranged in a rectangular shape according to the bottom shape of the protective guard and the local edge shape of the wind guide part of the reflector, and the distance from the fan to the discharge hole varies depending on the position of the discharge hole (for example, the distance from the fan to the discharge hole varies depending on the position of the discharge hole). Since the distance to the discharge hole is the longest), there is a problem that hot air is blown out from the discharge hole unevenly.

The flow of air from the fan is tilted in the direction of rotation relative to the radial direction of the fan, so if the longitudinal direction of the discharge hole and the radial direction of the fan are in the same direction, the amount of air blown out will be reduced and the air will circulate inside the unit. There is a problem that the thermal efficiency deteriorates.

(c) Problems to be Solved by the Invention The present invention aims to solve the above-mentioned problems and provides a warm air type kotatsu unit that blows hot air uniformly and efficiently.

B) Means for Solving the Problems The present invention provides a reflector having a wind guide portion with a circular peripheral edge, a fan and a heater disposed inside the wind guide portion,
The fan is equipped with a motor that drives the fan, and a protective guard having an intake hole on the center side of the bottom plate and a discharge hole on the outer circumferential side, and the discharge hole is connected to the rotating shaft of the motor at a position facing the wind guide section. They are arranged in concentric circles. Further, the discharge hole is a long hole, and the longitudinal direction thereof is inclined to the rotation direction of the fan.

(E) Function: Therefore, the discharge holes are at the same distance from the fan, and the edges of the air guide portions are located opposite each other, so that the hot air generated by the rotation of the fan and heated by the heater is uniformly distributed. Also, since the discharge hole is inclined in the direction of rotation of the fan, the lice can be discharged smoothly, improving air circulation within the unit and increasing the thermal efficiency of the unit.

(f) Example Embodiments of the present invention will be described below with reference to the drawings.

(1) in the figure is the main body of the Yagura Kotatsu (as shown in Figure 5).
2) is a warm air type kotatsu unit disposed within a mounting frame formed by a crosspiece (4) on the ceiling (3), and has a rectangular shape. (5) is a reflector plate attached to the lower surface of the unit top plate (6), which has an inverted truncated conical part (7) that protrudes downward in the center by drawing process, and an outer periphery of this trapezoidal part (7) to the outside. A downwardly inclined wind guide surface (8) is formed and its peripheral edge <9) A wind guide part αO that is concentric with the center of the t-trapezoidal part (7) and a peripheral edge of this wind guide part αO (9) A bottom plate portion αD extending horizontally outward from the side plate αD and a side plate portion αD extending horizontally outward from
2 are integrally formed.

(13 is a motor disposed within the inverted truncated conical part ('r) and fixed to the bottom plate with screws and nuts, and a motor rotation shaft 041 passes through the center of the bottom plate and leads downward.

0!9 is a flat plate-shaped ventilation fan located inside the air guide portion αO and pivotally attached to the motor rotation shaft C141, and as shown in FIG.
The main blade α gauge, which is formed by bending the edges upwards, is provided concentrically, with a notch in the center! ! Auxiliary blades a9, which are formed by bending the edges of the blades downward, are provided concentrically, and rotate counterclockwise when viewed from below the unit to blow air as shown by arrow B. . Here, the peripheral edge part (9) of the wind guide part α0 is concentric with the motor rotation axis α], so that the upward and lateral wind generated by the rotation of the fan (Is) is It is uniformly sent out from the peripheral portion (9) along the guide portion αO.

■ is a ring-shaped heater that serves as a heating element, and the fan (I
They are arranged concentrically above the reflector plate (5) and are held horizontally on the lower surface of the reflector plate (5) by the mounting bracket and the support bracket.

is a protective guard made of sheet metal that covers the reflector (5), the fan OS, and the heater ■ from below, and as shown in the bottom view in Figure 2, there is a protective guard on the bottom □□□ that faces the motor rotation axis αa. Auxiliary holes (c), intake holes, and discharge holes are sequentially arranged in a concentric circle from the center to the outer circumferential side with the center as the center. And inside the auxiliary hole...
is located opposite the fan stop auxiliary blade (19...),
The intake holes ■ are located opposite to the main blades (171), and the discharge holes are located opposite the peripheral edge (9) of the wind guide portion α0. .Furthermore, the discharge hole...
* forms a long hole, the longitudinal direction of which is inclined in the rotational direction of the fan stop with respect to the radial direction of the fan convex.

Therefore, when the fan α9 rotates, air is taken in from the intake holes (■) due to the wind cutting action of the main blades (171), and wind is generated upward and toward the outer circumference of the fan u51 as indicated by arrow A in FIG. After the wind is warmed by the heater ■, it is sequentially guided to the discharge holes along the wind guide part αO, and is smoothly and uniformly discharged from the discharge holes. C... is arranged concentrically with the motor rotation axis α, and is located at the circular peripheral edge of the wind guide part αO (
9), the air generated by the fan αS gathers uniformly and in a concentrated manner, and the hot air 11 can be discharged extremely uniformly and smoothly. In addition, the longitudinal direction of the discharge hole ω is inclined to the rotation direction of the fan (Is), so the longitudinal direction and the wind discharge direction are the same, reducing the resistance when the wind is discharged, and Discharge amount increases.

Therefore, the circulation of air inside and outside the unit (1) becomes smooth, and the thermal efficiency of the unit (1) increases.

The auxiliary blade l of fan beating generates downward wind,
This not only has a cooling effect on the protective guard @, but also allows the air inside the unit (1) to be auxiliaryly discharged from the auxiliary hole (to) located below it.
) promotes wind circulation within the interior.

(2) is a connector for power supply, and the container (2) is connected to this connector (2) and is a temperature control section that controls the heater (2).

To assemble the unit (1), attach the motor 0J1 fan, heater 2, etc. to the reflector plate (5), cover the protective guard from below, and attach the reflector (5) and the upper edge of the circumference of the protective guard. The reflector (5) and the protective guard are overlapped and brought into contact with the bottom surface of the periphery of the unit top plate (6), and a tapping screw is screwed in from above the top plate (6). 23
) to the top plate (6). This unit (1)
Insert it into the mounting frame of the ceiling (3) from above! It is then suspended and incorporated into the Yagura Kotatsu main body (2).

(G) Effects of the Invention As described above, the hot air type kotatsu unit of the present invention has a discharge hole on the outer circumferential side of the bottom plate of the protective guard, and a fan is placed in the position of the stone that rotates this discharge hole opposite to the wind guide part of the reflector. By arranging it concentrically with the rotation axis of the unit, the air taken into the unit can be discharged uniformly as hot air. Furthermore, by tilting the longitudinal direction of the discharge hole in the rotation direction of the fan, the flow of air through the discharge hole is smoothed, the amount of air discharged is increased, the circulation inside the unit is improved, and the thermal efficiency of the unit is increased. I can do it.

[Brief explanation of the drawing]

The drawings show an embodiment of the hot air type kotatsu unit of the present invention, in which Figure 'iJ1 is a cutaway front view of the main part, Figure 2 is a bottom view of the protective guard, Figure 3 is a bottom view of the main part, and Figure 4 is a bottom view of the main part. The figure is a bottom view of the fan, and FIG. 5 is a partially cutaway side view of the tower kotatsu in which the kotatsu unit is incorporated. (1)...Warm air type kotatsu unit, (5)...Reflector, (9)...Periphery, αO...Wind guide part, l...
・Motor, -...Fan, ω...Heater, Tsu...
Protective guard, ■...Intake hole, Punishment...Discharge hole. Applicant Sanyo A1M Co., Ltd. 1 other representative Patent attorney Takuji Nishino (1 other person) Figure 2 262
7 27 1I) 26 Z')

Claims (2)

[Claims] (1) A reflector plate disposed on the lower surface of the unit top plate and having a wind guide section that slopes outward and downward and has a circular peripheral edge, and a fan and a heater disposed inside the wind guide section. ,
A protective guard is provided that covers a motor that drives the fan, the reflector, the fan, and the heater from below, and the protective guard has an intake hole in the center and a discharge hole in the outer circumference, and the discharge hole is connected to the wind guide. A hot air type kotatsu unit, characterized in that it is arranged in a circular shape concentric with the rotational axis of the motor at a position facing the motor. (2) The warm air type kotatsu unit according to claim 1, wherein the discharge hole is a long hole, and the longitudinal direction thereof is inclined toward the rotation direction of the fan.