JPH10300231A - Thermal storage type electric hot air heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve air volume and radiating ability by incorporating warm air positive temperature coefficient heating element, blower and thermal storage unit, providing a bypass passage and variable damper for varying the air volume according to thermal storage amount, and constituting a damper operating means by shape memory alloy which deforms according to suction temperature. SOLUTION: A warm air bypass passage 13 before an air outlet 4 is provided adjacent to a warm air passage of a positive temperature coefficient heating element 2. An opening/closing mechanism of the passage 13 includes an opening/ closing damper 14 in the passage 13, damper operating shape memory alloy 15 and damper operating spring 16. The warm air from a thermal storage unit 6 sucked by a fan 9 is divided into a warm air passage passing the element 2 and the passage 13, and exhausted from the outlet 4. A ventilating resistance before the outlet 4 becomes small, the air volume increases to obtain high radiating effect, resulting in a decrease in a noise value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric hot air blower having a built-in heat storage device and used for heating a general home. More specifically, the present invention relates to a hot air bypass passage for changing an air flow according to a heat storage amount. The present invention relates to a regenerative electric hot-air fan that improves the heat radiation effect from a heat storage device and changes the air volume more continuously by using a shape memory alloy for the operation means of a variable damper in a bypass passage.

[0002]

2. Description of the Related Art Conventionally, an electric warm air blower composed of a positive characteristic heating element and a blower has been widely put into practical use because it can be easily operated using a power supply of AC100V in a general household.
However, since the heating capacity of this electric hot air heater is limited to a small capacity of about 1.2 kW from the capacity of the outlet and the breaker, in recent years, a heat storage device is built in and heat energy is stored in the heat storage device when heat radiation is not required. In addition, a regenerative electric hot-air fan having a heating capacity higher than that of the electric hot-air fan by using it together with the above-mentioned electric hot-air heater when necessary is proposed.

FIG. 3 shows a conventional electric hot air blower using this type of heat storage device. FIG. 3 shows a structure in which the positive characteristic heating element 2 for hot air, the blower 3 and the heat storage device 6 are built in, and the heat storage device 6 is connected to the hot air passage so that the same air flows through the positive characteristic heating element 2 and the heat storage device 6. In the same passage as the above to constitute a regenerative electric hot air fan.

In FIG. 3, a heat storage device 6 is provided with a dedicated heat storage heating element 11 so as to be in contact with the heat storage device 6. Is done. The heat storage heating element 11 is formed of a normal surface heater, and the heat storage device includes a latent heat storage device utilizing a phase change of a substance or a sensible heat storage device.

When the heat storage device 6 and the positive characteristic heating element 2 are operated in combination, when the fan 9 is rotated by the blower motor 8, room air flows from the suction port 7 by the suction force of the fan 9,
After passing through the heat storage device 6, the heat is radiated by the heat storage device 6 to become warm air and reach the positive characteristic heating element 2. The room air further warmed by the positive characteristic heating element is discharged from the warm air outlet 4.

[0006]

Among the above prior arts, in the regenerative electric hot air blower shown in FIG. 3, the positive characteristic heating element 2 for hot air is provided in the same hot air passage as the heat storage device 6. Therefore, the warm air radiated from the heat storage device 6 passes through the warm air positive characteristic heating element 2 having a large ventilation resistance, and it is not possible to obtain an air volume enough to quickly radiate the heat stored in the heat storage device 6. In addition, the heat radiation efficiency deteriorated, and the required heat radiation could not be obtained in a short time. Conversely, if the air flow is increased to obtain the required heat dissipation, the resistance becomes higher when the warm air from the heat storage device 6 passes through the positive characteristic heating element 2 for the warm air, thereby increasing the noise value during operation. Had.

The present invention has been made in view of such a conventional problem, and has as its object the purpose of the present invention is to provide a positive characteristic heating element 2 and a heat storage device 6.
The present invention is to provide a regenerative electric hot-air fan having a much larger air volume and heat radiation capability than the conventional one and having a low noise value when used together.

[0008]

SUMMARY OF THE INVENTION To achieve this object, the present invention provides a bypass passage which incorporates a positive-characteristic heating element for warm air, a blower and a heat storage device, and varies the air flow by the amount of heat stored. A damper is provided, and the operating means of the damper is made of a shape memory alloy that is deformed by the suction temperature.

According to this configuration, the heat radiation state of the heat storage device is detected by the shape memory alloy for damper operation, and the opening area of the bypass passage is continuously changed, so that the air volume is increased during the combined operation of the heat storage device. This not only enhances the heat dissipation effect, but also lowers the noise level.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. The same members as those in the conventional example shown in FIG. 3 are denoted by the same reference numerals.

<First Embodiment> FIG. 1 is a longitudinal sectional view showing a regenerative electric hot air blower according to a first embodiment of the present invention.

In FIG. 1, a bypass passage 13 for hot air is provided in front of the outlet 4 so as to be adjacent to the hot air passage of the positive characteristic heating element 2. The opening / closing mechanism of the bypass passage 13 includes an opening / closing damper 14 in the bypass passage 13.
And a shape memory alloy 15 for damper operation and a spring 16 for damper operation.

The warm air from the heat storage device 6 sucked by the fan 9 is divided into a warm air passage passing through the positive characteristic heating element 2 and a bypass passage 13 disposed adjacent to and parallel to the warm air passage. Released. In this case, as compared with the conventional example shown in FIG. 3, the ventilation resistance in front of the outlet 4 becomes smaller, the air volume increases, and a much higher heat radiation effect can be obtained, which in turn leads to a reduction in noise value.

The principle of operation of the damper 14 in the bypass passage 13 will be described below. In FIG. 1, between the lower side of the damper 14 and the lower part of the inner surface of the bypass passage 13, a damper 14 is provided.
An opening shape memory alloy 15 is provided. On the other hand, a spring 16 (elastic member) for closing the damper 14 is disposed between the upper side of the damper 14 and the upper part of the inner surface of the bypass passage 13.

First, the shape of the shape memory alloy 15 at a predetermined temperature is stored in a coil shape, and the damper 14 is set to be opened in a squeezed state (ie, a coil shape). Further, the tension relationship between the spring 16 and the shape memory alloy 15 is based on the shape memory alloy 15 in a coiled state.
Is larger than the spring 16.

Further, the initial temperature at the time when the warm air from the heat storage device 6 sucked by the fan 9 passes through the bypass passage 13 is set to Ta, and the operating temperature of the shape memory alloy 15 is set to Tb slightly lower than Ta. .

When the hot air operation is started when the heat storage of the heat storage device 6 is completed, the shape memory alloy 15 is heated by the hot air from the heat storage device 6 and the temperature of the shape memory alloy 15 gradually increases to Tb. The shape memory alloy 15 is gradually deformed into a shape-memory coil shape. In this shape, the tension of the shape memory alloy 15 becomes larger than the tension of the spring 16, so that the damper 14 is gradually opened and the heat storage Device 6
The hot air flows from the warm air passage passing through the positive characteristic heating element 2 and the bypass passage 13 separately.

After the warm air operation, as the time elapses, the amount of heat stored in the heat storage device 6 decreases, and the temperature of the hot air from the heat storage device 6 gradually decreases, and accordingly, the temperature of the shape memory alloy 15 also decreases. And the tension of the shape memory alloy 15 also gradually decreases, and the damper 14 gradually closes,
The amount of air passing through the bypass passage 13 also decreases continuously.

<Embodiment 2> In FIG. 2, the shape memory alloy 1 for damper operation is provided on the heat storage device 6 side of the damper 14.
5, and a spring 16 for damper operation are provided, and one end of the shape memory alloy 15 is connected to the heat storage container 10 so as to be able to conduct heat.

In the same manner as in the first embodiment, the memory shape of the shape memory alloy 16 is coiled, and the shape memory alloy 1
It is set so that the damper 14 is opened in a state where 6 is extended. The tension relationship between the damper 14 and the spring 16 is such that the tension of the shape memory alloy 15 in the coiled state is greater than the tension of the spring 16 as in the first embodiment of FIG.

Assuming that the initial surface temperature of the heat storage container 10 upon completion of the heat storage is Tc, the operating temperature of the shape memory alloy 15 is set to Td slightly lower than Tc. When hot air continuous rotation is started at the time of completion of heat storage, the shape memory alloy 15 is heated by heat conduction from the heat storage device 6, and the temperature of the shape memory alloy 15 becomes Td.
When it rises, the tension of the shape memory alloy 15 for damper operation becomes larger than the tension of the spring 16 for damper operation, so that the damper 14 is opened and the heat storage device 6 is opened.
As in the first embodiment, the warm air flows from the ventilation passage passing through the positive characteristic heating element 2 and the hot air passage bypass 13.

In the second embodiment, since the shape memory alloy 15 is connected to the heat storage container 10, the heat storage state of the heat storage device 6 can be directly sensed, and the expansion / contraction state of the shape memory alloy 15 can be changed. Responsiveness of damper opening / closing due to a change in heat storage amount can be improved.

[0023]

As described above, according to the regenerative electric hot air blower of the present invention, the following effects can be obtained. According to the first aspect of the present invention, when the heating element and the heat storage device are used in combination, not only a much larger air volume and heat radiation effect can be obtained compared with the conventional regenerative electric hot air fan, but also the noise value during the combination operation. It also leads to a decline.

According to the second aspect of the present invention, it is possible to reliably open and close the bypass passage. According to the third aspect of the present invention, the bypass passage can be switched between an open state and a closed state depending on the temperature of the air flowing into the bypass passage.

According to the fourth aspect of the present invention, the opening area of the bypass passage is changed by continuously changing the degree of opening and closing of the damper by the shape memory alloy, thereby continuously changing the amount of air flowing in. The air volume from the passage can be controlled.

According to the fifth aspect of the present invention, the temperature change of the heat storage device can be directly sensed, and the damper can be opened and closed more accurately.

According to the present invention, the damper can be opened at a predetermined temperature. According to the seventh aspect of the present invention, the damper can be opened in conjunction with heat radiation from the heat storage device.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a regenerative electric hot air fan according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of Embodiment 2 of the regenerative electric hot air fan of the present invention.

FIG. 3 is a longitudinal sectional view of a conventional regenerative electric hot air blower.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Positive characteristic heating element 3 Blower 4 Hot air outlet 6 Heat storage device 7 Suction port 8 Motor 9 Fan 10 Heat storage container 11 Heat storage heater 12 Control microcomputer 13 Bypass passageway 14 Damper 15 Shape memory alloy 16 Spring

Claims (7)

[Claims] 1. A regenerative electric hot air blower comprising a heating element for generating hot air, a blower and a heat storage device, and a blower for blowing the heating element and the heat storage device, wherein air passing through the heating element and the heat storage device A hot-air passage for sending air, a bypass passage for sending air that has passed through the heat storage device, and a damper for opening and closing the bypass passage. 2. The regenerative electric hot air blower according to claim 1, wherein the degree of opening and closing of the damper changes according to the temperature of air flowing into the bypass passage. 3. An elastic member for urging the damper in a direction to close the bypass passage, and a shape memory alloy for urging the damper in a direction to open the bypass passage in accordance with a temperature of air flowing into the bypass passage. The regenerative electric hot air blower according to claim 1, comprising: 4. In order to change the degree of opening and closing of the damper,
3. The regenerative electric hot air blower according to claim 2, wherein a shape memory alloy that is deformed according to the temperature of air blown from the heat storage device is provided. 5. The regenerative electric hot air blower according to claim 3, wherein the shape memory alloy is connected to the heat storage device so as to be able to conduct heat. 6. The heat storage type according to claim 3, wherein when the temperature of the air flowing into the bypass passage reaches a predetermined temperature, the tension of the shape memory alloy becomes larger than the tension of the elastic member. Electric hot air heater. 7. The regenerative electric hot air blower according to claim 6, wherein the predetermined temperature is lower than a temperature of air heated by heat release of the heat storage device.