JPS6238622B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a hot air heater unit most suitable for electric kotatsu.

(b) Prior Art For example, the hot air heater unit used in an electric kotatsu is desirably as thin as possible since it is necessary to increase the space inside the kotatsu. In the past, various proposals have been made for the purpose of making the device thinner, such as reducing the diameter of the heater and minimizing the spatial distance between each member. In this case, the temperature inside the unit increases simply because each part is made smaller in diameter and space distance, and the protective guard in particular becomes hot, creating a risk of burns, and the upper plate of the unit may become deformed or burnt. I had it.

Therefore, in addition to the above-mentioned structure, a fan is installed inside the unit, and this fan forcibly releases the hot air inside the unit to the outside, thereby lowering the temperature inside the unit and reducing the spatial distance between each member. It became possible to make it smaller. However, since the distance between the fan and the mounting plate (reflector plate) on which the fan is attached is quite close, if the protective guard is pressed from the bottom, the fan will hit the mounting plate and cause the motor to lock, causing an abnormality inside the unit. The temperature was high.

Also, recently there are heaters that steplessly adjust the power consumption of the heater to obtain the desired amount of heat, but a specific method for this is to detect the temperature inside the heater unit and adjust the heater's power consumption. A heat sensitive body such as a thermistor is provided to adjust power consumption. However, the heat sensitive body is provided in a box-shaped connector that is detachably connected to the power connector in the heater unit in order to simplify the wiring and to facilitate the maintenance of the heat sensitive body. When built into a box-shaped connector,
This resulted in a delay in thermal response, making it impossible to accurately sense temperature.

Furthermore, as the heater unit becomes thinner, the heater and the protective guard become closer to each other, resulting in the protective guard becoming hot and causing a risk of burns.

(C) Object of the Invention The present invention provides accurate temperature sensing by providing a heat sensitive element connected to a heater inside the connector and close to the upstream side wall that receives hot air circulated by a fan.

(d) Structure of the invention A fan rotationally driven by a motor, a heater provided on the outside of the fan, a power connector connected to the heater and the motor, a box-shaped connector that is attached to and detached from the power connector, A heat sensitive element is provided inside the connector and close to the upstream side wall of the hot air circulated by the fan.

(e) Examples Examples of the present invention will be described. Reference numeral 1 denotes a wooden, rectangular, flat upper plate; 2, a wind guide plate provided on the lower surface of the upper plate; a rising piece 4 is provided on the periphery with a downwardly inclined portion 3 on the outside; A space 5 is formed between the plate 1 and a flat mounting part 6 at the peripheral edge of the lower surface of one side. Two square holes 7, 7 and screw holes 8, 8 are bored at spaced apart positions on the flat mounting portion 6 side and the opposite side of the wind guide plate 2, respectively. Reference numeral 9 forms a flat plate-like mounting part 10 for a motor, which will be described later, in the center, and two supporting legs 11, 11, 11, 1 are provided on opposite sides of the mounting part 9, respectively, as shown in FIG.
1, the support leg 1 is
1, 11, 11, 11, as shown in FIGS. 7 and 9, have an upwardly inclined piece 12, and the inclined piece has folded pieces 13, 13 on both sides, and has a vertically bent piece at the end. It has a curved piece 14, at the end thereof a mounting piece 16 which is bent horizontally and has a large diameter screw insertion hole 15, and further at the end thereof is a locking piece 16 which is bent vertically again. A piece 17 is formed. 18 is a motor fixed to the upper surface of the motor attachment part 10; 19 is a fan fixed to the rotating shaft 20 of the motor; and 21, 21 is the fan 1 fixed to the rotation shaft 20 of the motor;
Tube-shaped heaters 22, 2 are located outside of the wind guide plate 9 and fixed to the lower surface of the wind guide plate 2 so as to be parallel to each other.
Reference numeral 2 denotes a heat shield plate having a substantially U-shaped cross section fixed to the lower surface of the heater at a predetermined interval, and L-shaped support pieces 23 are bent on both ends as shown in FIG. A plurality of heat transmission holes 2 are drilled with regularity.
4, 24... are provided. This heat transmission hole is the first
The heaters 21, 21, which are located on the lower surface as shown in FIG. After the heat shield plate 22 is attached to the wind guide plate 2, the folded edge 25a close to the inner fan is located at the same position as the lower wall of the heater 21, and the folded edge 25b far from the outer fan is placed upward. It extends to the same position as the upper wall of the heater 21.
This is to allow the wind generated by the fan 19 to easily flow into the heaters 21, 21 side, as will be described later, and to prevent the radiant heat from the heaters 21, 21 from directly transmitting to the sides. 26, 26
27 is a rectangular insulated terminal block fixed to the corner side of the space 5; 27 is a lead wire provided in the space 5 and connected to the motor 18 and the heaters 21, 21 through the wind guide plate 2; Then, as shown in FIGS. 10 and 11, the corner portions are engaged with the adjacent rising pieces 4, 4, and screwed and fixed to the wind guide plate 2 with screws 28. 29a and 29b are terminal plates fixed to the insulated terminal block 27, and 30 is the flat mounting portion 6.
A rectangular power connector is fixed in a direction perpendicular to the heaters 21, 21, and has a rectangular insulator 31 and the lead wires 26, 26 fitted into the insulator.
A plurality of connection pins 27a, 27b, 2 connected to
7c, and a terminal cover 32 that covers the insulator 31.
It consists of Reference numeral 33 denotes a protective guard provided below each of the motor 18, motor mounting bracket 9, heaters 21, 21 and power supply connector 30, and a plurality of reinforcing bars 34, 34 with thick wire diameter arranged at slightly wider equal intervals. . . . and a plurality of thin protective bars 35 with small diameters, which are perpendicular to the reinforcing bars and arranged at slightly narrow equal intervals.
35..., whose outer peripheral edge is fixed to the side frame 36 by welding. The reinforcement bars 34, 3
4... are disposed perpendicular to the heaters 21, 21, so that the protective bars 35, 35... are in the same direction as the heaters 21, 21 and the heat shield plates 22, 22 as shown in FIG. The protective bars 350, 350 located directly below the hot plate 22 are located at the same position as the heat transmission holes 24, 24. The reason for this is that the reinforcing bars 34, 34, . There is no risk of burns. In addition, the radiant heat from the heat transmission holes 24, 24... is transmitted through the protective bars 35, 35.
prevent direct contact with the skin. 37 is the power supply connector 3 toward the shaft side of the fan 19.
0 is a flat box-shaped connector that can be attached and detached freely.
A disk-shaped heat sensitive body 38 like a thermistor for sensing the ambient temperature is installed on the internal connection side, and the connection pins 27a, 27b, 2 are installed in other parts.
A plurality of pin receivers 39a, 39b, corresponding to 7c.
39c is provided. The heat sensitive body 38 is provided close to the upstream side wall of the connector 38 which receives the hot air circulated by the fan 19, as shown in FIG. Therefore, this heat sensitive element 38 is not obstructed by the power supply connector 30 and the connector 37 and can always detect the temperature of the circulating warm air. Moreover, the power connector 30 is provided between the rod-shaped heaters 21, 21 and at the ends of the heaters 21, 21, or on the outside apart from the ends, and as a result, the power connector 30 is not connected to the power connector 30. Ru. connector 3
The heat sensitive body 38 in the heater 7 also has the same positional relationship as the power connector 30 with respect to the heaters 21, 21. 40, 40... is the pin receiver 39
This is a connection cord connected to a, 39b, 39c and the heat sensitive body 38.

FIG. 12 shows an electrical circuit diagram. 41
is a temperature regulator 42, a capacitor 43 and a resistor 44
A temperature control circuit includes an ignition circuit 45, a constant voltage conduction element 46, an adjustment circuit 47, and a rectifier with control pole 48; 49 is an AC power supply; The other pole is connected to one pin receiver 39c via the control pole rectifier 48. The heat sensitive body 38 is connected between the pin receiver 39c and the temperature regulator 42, and is connected in parallel with the adjustment circuit 47. The remaining pin receiver 39a is connected to the other pole of the AC power source 49. Heater 2
1 and 21 are connected in parallel, one end of which is connected to the connecting pin 27c, the other end of which is connected and fixed to one terminal plate 29a of the insulated terminal block 27, and connected to the connecting pin 27b via the temperature fuse 51. Connection pin 27
a is connected and fixed to another terminal board 29b, and the motor 18 is connected to each terminal board 29a, 29b.
connected between. Next, the assembly structure of each part will be described.

For the motor mounting bracket 9, insert the locking piece 17 of the support leg 11 into the square hole 7 as shown in FIG. It comes into contact with the bottom surface of 2. At this time, the hole wall of the screw insertion hole 15 forms a slight gap L closer to the center of the motor mounting bracket 9 than the hole wall of the screw hole 8. Then, insert the screw 52 into the screw hole 8 through the screw insertion hole 15.
Screw it into place. Therefore, as shown in FIG. 7, when an upward pressing force is applied from the lower surface of the protective guard 33 by a foot or the like, that force is transmitted from the protective guard 33 to the motor mounting bracket 9, and the fan 19 guides the wind. The support leg 1 acts to come into contact with the lower surface of the plate 2.
It is received by the locking part between the locking piece 17 of 1 and the square hole 7, and is applied perpendicularly to the wind guide plate 2 by the bent piece 14 which is bent in the vertical direction, so that the motor mounting bracket 9 is moved upward. to prevent deformation. That is, the pressing force on the motor mounting bracket 9 is
4, the mechanical strength is increased because it is received vertically. In addition, the above-mentioned pressing force is
1 moves by the play l in the square hole 7 of the locking piece 17, but since the hole wall on the center side of the motor mounting bracket 9 in the screw insertion hole 15 does not hit the screw 52, the screw hole in the reflection plate 2 moves. No local force is applied to 15, but the force is received by the surface formed by the locking piece 17 and the hole wall of the square hole 7. Of course, the gap L and the play l are set so that L>l.

Since the insulating terminal block 27 is engaged with the adjacent rising pieces 4, 4 and fixed with the screws 28, this engagement prevents rotation when tightening, and can be easily screwed and fixed. 2
It can be fixed at 8.

On the other hand, the wind generated by the fan 19 flows along the upper outer wall of the heater 21 and the wind guide plate 2
One flows through the inclined part 3 along the upper wall surface of the fan 19, and the other flows between the heater 21 and the heat shield plate 22 from the folded edge 25a on the side closer to the fan 19 and flows along the lower wall surface of the heater 21 at the folded end far from the fan 19. Rim 25
The water flowing from the upper part of b on the slope part 3 joins together and flows to the outside via the protective guard 33. That is, the folded edge 25a on the side closer to the fan is the heater 21,
This prevents the radiant heat of the fan 19 from directly radiating diagonally and providing stimulating warmth, and allows the wind from the fan 19 to easily flow into the heater section. The length is set to prevent radiant heat from directly hitting the skin, and to allow warm air to flow out efficiently. Therefore, as shown in FIG.
It is sufficient to position it below the line X connecting the upper ends.

The radiant heat of the heaters 21, 21 is blocked by the heat shield plate 22 located directly below the heaters 21, 21, and the heat transmission holes 24, 2
4... The radiant heat from... is the protective crosspiece 350, 350...
, the radiant heat does not directly hit any lower part of the protective guard 33. As mentioned above, the radiant heat from the outer wall of the heater hits the protective bars 35, 35... through the heat transmission holes 24, 24..., but since the wire diameter is small, the heat capacity is small and there is a risk of burns. do not have.

As mentioned above, the air generated by the rotation of the fan 19 is heat-exchanged in the heater section and becomes warm air, which agitates various parts of the main body and flows out below the protective guard 33, as shown in Fig. 4. Since the heat sensitive body 38 is arranged in this manner, the hot air directly hits the heat sensitive body 38 without any obstruction as shown by the arrow in FIG. By changing the value, the voltage to the temperature regulator 42 and ignition circuit 45 side is changed, and the conduction of the rectifier 48 with control poles is controlled to adjust the temperature to the temperature set by the temperature regulator 42.

(f) Effects of the invention As described above, the present invention provides a flat wind guide plate,
A pair of rod-shaped heaters provided on the lower surface of the wind guide plate and spaced apart from each other, a fan provided approximately in the center of the space and rotated by a motor, and a space located between the heaters and at an end of the heaters. Alternatively, a power connector provided on the outside apart from this end and electrically connected to the heater and the motor, a box-shaped connector for power supply that is attached to and detached from the power connector, and a temperature control device for the heater. Since the heat sensitive body is provided inside the connector and close to the upstream side wall that receives the warm air circulated by the fan, the wiring of the heat sensitive body is In addition, maintenance of this heat sensitive body can be easily performed by removing the connector. Furthermore, the thermal responsiveness of the thermosensitive body is further improved, making it possible to accurately sense the temperature inside the unit main body, and to perform control according to the temperature. Moreover, the heat sensitive body is located at the end of the rod-shaped heater,
Since it is not located opposite to the body of the heater, this heat-sensitive element does not receive direct heat from the heater, and therefore can efficiently and reliably sense and detect forcedly circulated warm air. .

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view of the hot air heater unit of the present invention, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, Fig. 3 is a cross-sectional view taken along line B-B in Fig. 1, and Fig. 4 is a partial cross-sectional view. A plan view, FIG. 5 is a partial side sectional view, FIG. 6 is a perspective view of the end of the heat shield, FIG. 7 is a partial side sectional view of a different part from FIG. 5, and FIG. 8 is a partial side sectional view of the motor mounting bracket. FIG. 9 is a sectional view of the fixed part of the support leg, FIG. 9 is a perspective view of the support leg, FIG. 10 is a partially cutaway perspective view showing the insulated terminal block installed, and FIG. 11 is the insulated terminal block shown in FIG. 10 installed. FIG. 12 is a partially cutaway plan view showing an electrical circuit diagram. 1...Top plate, 2...Reflector, 18...Motor, 19...Fan, 21, 21...Heater,
30... Power connector, 38... Heat sensitive element.

Claims (1)

[Claims] 1. Between a flat wind guide plate, a pair of rod-shaped heaters provided on the lower surface of the wind guide plate with a gap between them, a fan provided approximately at the center of the gap and rotationally driven by a motor, and the heater. and a power connector provided at an end of the heater or outside at a distance from the end and electrically connected to the heater and motor, and a box-shaped power supply that is attached to and detached from the power connector. and a heat sensitive body for controlling the temperature of the heater, the heat sensitive body being provided inside the connector and close to an upstream side wall that receives hot air circulated by the fan. A hot air heater unit featuring: