JP3120193B2 - Hot air blower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot air dryer having a heat-sensitive element for preventing excessive temperature rise, such as a hair dryer, a hot air fan type kotatsu, a hot air heater and a hot air dryer. Is intended to improve the responsiveness of the thermosensitive element.

[0002]

2. Description of the Related Art For example, as a temperature control device for a hair dryer, a thermostat for preventing an excessive temperature rise as disclosed in Japanese Patent Application Laid-Open No. 55-28684 is used for a heater substrate having a cross-shaped cross section around which a heater is wound. Installation on top is known.

Further, as disclosed in Japanese Patent Publication No. 57-30485 and Japanese Utility Model Application Laid-Open No. 58-71307, a thermostat for preventing overheating is installed in a ventilation path, and air is sucked into a contact of the thermostat. It is also known that a windshield or a dustproof cover is fixedly arranged on the windward side of the thermostat so that dust inside may not be attached to cause poor contact.

[0004]

When the hair dryer is in use, for some reason, for example, a towel or the like inadvertently hangs to block the suction port or the air outlet, and in the case of a hair blower, for example, a brush attachment or the like is used. If the hair is excessively wound around the air outlet, the air blowing capacity is temporarily reduced and reduced, whereby the air temperature rises abnormally. However, in such a case, if the thermostat does not respond immediately and the response time is delayed, the hair or parts may be damaged or burned by high heat. Therefore,
It is important that the thermostat responds immediately to rising wind temperatures. However, when looking at the temperature distribution on the cross-shaped heater substrate on which the thermostat is installed, the wind temperature passing on the outer peripheral side near the heater is high, and the wind temperature passing near the center of the substrate far from the heater is low. There is. If the thermostat is installed in a place where the wind temperature is low,
The thermosensitive part of the thermostat is cooled by directly receiving the low temperature wind. For this reason, even if the blowing capacity is reduced for some reason as described above and the wind temperature rises abnormally, the response time of the thermostat is delayed, and it is not possible to immediately respond to the abnormal rise in temperature.

In a windshield fixedly arranged on the windward side of the thermostat, wind having a low temperature from the blower fan can be prevented from directly hitting the thermostat, but the wind hitting the windshield is always located on the leeward side of the windshield. In order to cause turbulence, even during normal air blowing, the turbulence caused a change in the air volume and air temperature in the vicinity of the thermostat behind the windshield, causing variations in the hot air temperature, and cutting when the thermostat did not need to be cut, The wind temperature may not be stable. Therefore, it is difficult to set the thermostat and the windshield at any position. Such a problem is not limited to the hair dryer, and the same can be said for a hot air kotatsu or a hot air heater.

SUMMARY OF THE INVENTION An object of the present invention is to provide a warm air blower provided with a blower fan and a heater in a main body case, and provided with a heat-sensitive element for controlling overheating of the heater as described above. By improving the environment around the heat-sensitive element in accordance with the increase and decrease of the air flow, the heat-sensitive element can immediately respond to the excessive temperature rise due to the reduction of the air flow, thereby shortening the response time.

[0007]

The hot air blower according to the present invention comprises a main body case 1 having a blower fan 7, a heater 5 and a heat-sensitive element 12 for preventing excessive temperature rise as shown in FIG. The wind shield means 14 is provided on the upper side,
The wind-shielding means 14 is provided with the heat-sensitive element 12
It is characterized in that it is configured to open and close a ventilation path between the fan and the blower fan 7.

[0008]

During normal air blowing, the wind shield means 14 on the windward side of the heat-sensitive element 12 opens a ventilation path between the heat-sensitive element 12 and the blower fan 7, so that turbulence is generated and the temperature of the hot air varies. As a result, the thermal element 12 does not malfunction due to a variation in the temperature of the hot air. Further, at the time of normal air blowing, the wind having a low wind temperature always hits the heat-sensitive element 12 and is cooled, so that the heat-sensitive element 12 can always be supplied without operating the heat-sensitive element 12. If the air volume decreases for some reason, the warm air temperature rises abnormally, but at this time, the wind shield means 14 closes the ventilation path between the heat sensitive element 12 and the blower fan 7 and directly hits the heat sensitive part of the heat sensitive element 12. The low-temperature air that has cooled the heat is cut off or extremely reduced, and the temperature of the heat-sensitive element 12 easily rises as the temperature of the hot air rises, and the temperature immediately responds to the excessive temperature rise.

[0009]

Therefore, according to the present invention, the wind shield means 14 which opens and closes on the windward side of the thermal element 12 according to the increase and decrease of the air flow.
Is provided, the thermosensitive element 12 operates correctly at the time of normal air blowing, can respond immediately at an excessive temperature rise, and has a quick response time.
Advantageously, scorching and damage of hair and parts due to delay in response time can be prevented, and safety can be improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a cross hair type hair dryer in which an attachment such as a hair winding attachment or a hair brush attachment can be attached to and detached from a hot air outlet will be described with reference to the drawings. FIG. 2 shows a hair dryer, in which a main body case 1 is formed in a tubular shape that is long in the front-rear direction, and has a blowout port 2 at a front end side and a suction port 3 at a rear end side. A hair winding attachment 4 and a hair brush attachment are detachably attached to the outlet 2. A heater 5 and a blower fan 7 driven by a motor 6 are arranged side by side between the outlet 2 and the inlet 3 in the main body case 1. As shown in FIG. 4, the heater 5 is formed by winding a horizontal substrate 9 and a vertical substrate 10 around an outer periphery of a heater substrate 11 in which a cross section is combined.

A thermal element 12 for preventing excessive temperature rise, which is formed of a bimetal type thermostat, is provided on the horizontal substrate 9 at a position closer to the front end of the heater 5 than the center of the substrate 9. The heat-sensitive element 12 is connected in series between the heater 5 and the power supply 8 as shown in the circuit diagram of FIG. 5, and if the temperature of the hot air in the main body case 1 or the temperature of the heater 5 becomes excessively high. When the contact is separated, the power supply to the heater 5 is cut off, and when the temperature of the hot air drops, the contact comes into contact and the power to the heater 5 is supplied again.

In the circuit diagram of FIG. 5, a switch 13 controls energization of the drive motor 6 of the blower fan 7 and the heater 5, and switches the operation state from power-off to cool air, weak air, and hot air. That is, the switch 13 has five connection terminals of a first terminal to a fifth terminal, and the respective sliding operation knobs 13a shown in FIG. Are connected as shown in the table of FIG. 5 to switch the operation state.

On the windward side of the heat-sensitive element 12, there is provided a wind-shielding means 14 for opening and closing a ventilation passage between the heat-sensitive element 12 and the blower fan 7 in accordance with an increase or decrease in the amount of blown air. 1 to 4, the wind shield means 14 includes a wind shield plate 15 formed by bending a thin metal leaf spring such as a stainless steel plate or a phosphor bronze plate into an L shape. Denotes a notch 1 provided on the windward side of the thermal element 12 of the horizontal substrate 9
6, a horizontal plate 15 constituting an L-shaped piece thereof.
a is fixed to the horizontal substrate 9 with a rivet 17 or the like,
The vertical plate 15b constituting the other piece of the L-shape faces the windward side of the thermal element 12.

When the vertical plate 15b receives wind pressure, as shown in FIG. 1B, the end of the vertical plate 15b The horizontal plate 15a elastically deforms downward and opens until it hits the notch end 9a or the like, and the heat-sensitive portion of the heat-sensitive element 12 is cooled by the low-temperature wind separated from the heater 5. However, when a situation occurs in which the amount of air blows decreases for some reason, the wind pressure received by the vertical plate 15b of the wind shield plate 15 also decreases as shown in FIG. To prevent the heat-sensitive part of the heat-sensitive element 12 from being cooled by the low-temperature wind separated from the heater 5, and the heat-sensitive part of the heat-sensitive element 12 quickly reacts to the temperature in the main body case 1. However, as a result, there is no delay in the response time due to the low-temperature air, and the power supply to the heater 5 is interrupted by immediately detecting the excessive temperature rise. For this reason, for example, even if the hair volume is too low around the attachment 4 and the air volume is reduced, the heat-sensitive element 12 is activated before the hair is scorched by the hot air, and the wind temperature is reduced, so that the burning can be prevented.

In the above-described embodiment, the amount of air for inclining the wind shield plate 15 is set on the basis of, for example, 1200 W in the case of a 600 W / 1200 W switching type hair-blosser.
That is, the heater temperature at the time of strong wind / hot wind (1200 W) is considerably higher than 600 W, and especially when the air volume is significantly reduced in this use state, the inside of the dryer body and the blowing temperature become abnormally high. Therefore, the wind shield plate 15 depends on the air flow at 1200 W.
Are set to be opened by the wind pressure to open a ventilation path between the heat-sensitive element 12 and the blower fan 7. Then, if the air flow at 1200 W is cut by 60 to 80% or more, for example, as in the case where the hair is wound around the attachment 4 more than the required amount, the vertical plate of the wind shield plate 15 The wind pressure applied to the heat-sensing element 15b is also reduced, and the wind-shielding plate 15 is set up so as to close the ventilation path between the heat-sensing element 12 and the blower fan 7 in order to cut off the low-temperature wind hitting the heat-sensitive element 12 due to the elastic restoring force. However, the set value of the amount of air blown or raised by the wind shield plate 15 is not limited to such, and is arbitrarily changed according to the model and shape of the hot air blower, the wattage used, and the like.

In the above embodiment, the heater 5 and the outlet 2
Although the target is the thermosensitive element 12 disposed between
In addition, for example, as shown in FIG. 6, a heat-sensitive element 12 disposed between the heater 5 and the blower fan 7, or FIG.
The heat-sensitive element 12 arranged in the heater winding portion as shown in FIG.
As described above, the present invention can be similarly applied to the heat-sensitive element 12 disposed between the flat heater 5 and the blower fan 7. further,
As shown in FIG. 9, a zigzag heater 5 and a blower fan 7 are provided.
The thermosensitive element 12 can be attached to the motor 6 of the blower fan 7 in this case.

As the wind shield means 14, instead of a metal plate such as a stainless steel plate, a wind shield plate made of a synthetic resin thin plate may be used. 15 Instead of using the spring action of itself,
As shown in FIG. 10, a wind shield plate 15 is pivotally mounted on a heater substrate 11 so as to be rotatable around an axis 18, and a torsion coil spring 19 for urging the closing or a tension spring 20 as shown in FIG.
Can also be used in combination. Further, as shown in FIG. 12, holes 21 having different hole diameters may be arranged in the wind shield plate 15 to adjust an appropriate spring force with respect to the air volume.

As the thermal element 12 for preventing excessive temperature rise, a positive temperature coefficient thermistor, a negative temperature coefficient thermistor, or other semiconductor sensors can be used in addition to the bimetal type thermostat. Examples of the hot air dryer include a hot air type kotatsu, a hot air heater, and a hot air dryer in addition to the hair dryer.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an operation of a wind shield plate of a thermosensitive element.

FIG. 2 is an overall side view showing a state in which a part of a hair dryer is cut away.

FIG. 3 is a plan view of a heat-sensitive element and a wind shield.

FIG. 4 is a sectional view taken along line AA in FIG.

FIG. 5 is an electric circuit diagram.

FIG. 6 is a layout view of a heat-sensitive element showing another embodiment.

FIG. 7 is a layout view of a thermosensitive element showing still another embodiment.

FIG. 8 is a layout diagram of a thermosensitive element showing still another embodiment.

FIG. 9 is a layout diagram of a thermosensitive element showing still another embodiment.

FIG. 10 is a side view of a heat-sensitive element and a wind shield plate showing another embodiment.

FIG. 11 is a side view of a heat-sensitive element and a wind shield plate showing still another embodiment.

FIG. 12 is a perspective view of a wind shield plate showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body case 5 Heater 7 Ventilation fan 12 Thermal element 14 Wind shielding means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-215304 (JP, A) JP-A-53-21656 (JP, A) Jikai 58-71307 (JP, U) 28684 (JP, B2) JP-B-57-30485 (JP, B2) JP-B-55-2284 (JP, B2) JP-B-58-45603 (JP, Y2) (58) Fields surveyed (Int. Cl. ⁷ , DB name) A45D 20/10-20/12

Claims (1)

(57) [Claims] 1. A warm air blower in which a blower fan 7 and a heater 5 are provided in a main body case 1 and a heat-sensitive element 12 for preventing overheating of the heater 5 is provided. A warm air blower, wherein a wind shield means 14 for opening and closing a ventilation path between the heat-sensitive element 12 and the blower fan 7 in accordance with an increase or decrease in the amount of air is provided on the windward side.