JPH05223350A - Electric hot air heater - Google Patents

Abstract

PURPOSE:To obtain an electric hot air heater which is capable of preventing the degradation of a heating power resultant from a drop in consumption power and providing a larger heating power than a prior art electric hot air heater without allowing users to feel cooled air. CONSTITUTION:A positive temperature coefficient heating element 2 which heats the air absorbed from an inlet 7 and an air supply fan are laid out in a main body 1 while there is laid out an air supply duct 5 which introduces the hot air from the static characteristic heater 2 to an air supply port 4 installed to the main body 1. A heat storage device 6 is laid out on the suction side of the air supply fan 3 where the static characteristic heating element 2 is installed to the air supply side of the air supply fan 3. In addition, there is installed a control device 13, which controls the air supply fan 3 in such a fashion that the amount of air supply during a combined operation of the heat storage device 6 and the positive temperature coefficient heating element 2 may exceed the amount of air supply during a single operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a warm air generator comprising a positive temperature heating element and a blower fan for warming the air sucked from the air inlet in the main body of the warm air blower. The present invention relates to an electric warmer provided with a blower duct for guiding warm air from a wind generator to a blower port provided on the front surface of the warmer body.

[0002]

2. Description of the Related Art Conventionally, an electric warmer equipped with a warm air generator formed of a positive temperature heating element and a blower fan has been widely put into practical use because it can be easily operated by using an AC100V power source for general households. However, the heating capacity of this electric air blower is about 120 from the capacity of outlets and breakers.
Since it is limited to a small capacity of around 0 W, it was not possible to perform heating with a high amount of heat. For this reason, when the heat storage device is built-in and the heating (heat radiation) due to the high heat amount is not required, the heat storage device stores heat energy, and the heat storage device and the hot air generator are used together to increase the heat energy. An electric air blower for heating by the heating capacity has been proposed.

A first example of an electric warmer using this heat storage device will be described with reference to FIG. 4. In this electric warmer, a positive temperature characteristic heating element 22 disposed inside a warmer body 21 and the positive temperature characteristic heating are provided. Blower fan 23 for blowing the air heated by the body 22
And a blower duct 25 for guiding warm air blown from the blower fan 23 to a blower port 24 provided on the front surface of the warmer body 21, and a warm air generator 25 provided in the blower duct 25. And a heat storage device 26.

The warm air blower main body 21 is formed in a box shape, and the blower port 24 is provided at the lower front portion of the warm air blower main body 21 and the intake port 27 is provided at the upper rear portion thereof.

The blower fan 23 is composed of a motor 28 installed on the front plate of the blower duct 25 and a fan 29 fixed to the motor shaft of the motor 28. The positive characteristic heating element 22 was disposed in the air duct 25 on the side.

The heat storage device 26 is composed of a heat storage body 30 and a heat storage heater 31 for storing heat in the heat storage body 30. The heat storage device 26 is provided with the positive temperature characteristic heating body in the blower duct 25. It was disposed in the subsequent stage of 22 (between the positive temperature coefficient heating element 22 and the air outlet 24).

[0007] In addition, the second of the electric warmer using the heat storage device
An example of the above will be described with reference to FIG. 5. A warm air generator including a positive temperature characteristic heating element 22 disposed in the warm air fan body 21 and a blower fan 23 that blows air heated by the positive temperature characteristic heating element 22. A blower duct 25 is provided for guiding warm air blown from the blower fan 23 to a blower port 24 provided on the front surface of the warmer body 21, and a heat storage device 26 provided in the blower duct 25. It was

The positive characteristic heating element 22 is the blower duct 25.
Is disposed on the blower side of the blower fan 23 of
6 was disposed on the intake side of the blower fan 23 (between the blower fan 23 and the intake port 27).

A third example of the electric warmer using the heat storage device will be described with reference to FIG. 6. The positive temperature coefficient heating element 22, the blower fan 23, and the blower fan 23 are provided in the warmer body 21. The blower duct 25 is provided on the front surface of the warm air fan main body 21 to guide the blown air from the first blower opening 32 and the second blower opening 33.

The blower duct 25 is in communication with the first blower port 32 and has the first branch passage 34 in which the positive characteristic heating element 22 is arranged.
And a second branch passage 35 in which the heat storage device 26 is arranged in communication with the second blower opening 33, and a damper 36 for opening and closing the second branch passage 35 is formed at this branch portion. It was provided.

[0011]

In the electric warmer of the first example described above, the heat storage device 26 is disposed in the same passage as the positive temperature coefficient heating element 22 and at the subsequent stage of the positive temperature coefficient heating element 22. Therefore, the warm air heated by the positive temperature coefficient heating element 22 passes through the heat storage device 26 and is blown from the blower port 24, and the heat radiation efficiency of the heat energy stored in the heat storage device 26 deteriorates, which is short. The required heat radiation amount cannot be obtained in time, or the heat storage device 26 radiates heat and the heat storage device 26
When the temperature of the heat storage device 26 becomes lower than the temperature of the hot air, the heat storage device 26 does not radiate heat but conversely stores heat.

Further, in the electric warm air blower of the second example,
Since the warm air obtained by the heat dissipation of the heat storage device 26 passes through the positive characteristic heating element 22, the power consumption of the electric warmer (the positive characteristic heating element 22) is reduced due to the characteristics of the positive characteristic heating element 22, as shown in FIG. The positive characteristic heating element 22 and the heat storage device 2
There was a problem that the heating capacity would be reduced during the combined operation with 6.

For example, when the inlet temperature of the positive temperature coefficient heating element 22 (the temperature of the warm air blown to the positive temperature coefficient heating element 22) changes from 25 ° C. to 50 ° C., the power consumption of the electric warmer is 1200 W.
To about 1060 W, the overall heating capacity is reduced.

In the electric hot air blower of the third example, when the heat storage device 26 and the positive temperature coefficient heating element 22 for generating warm air are used together, the damper 36 is opened and the positive temperature coefficient heating element 2 is opened.
Different air is blown to the heat storage device 26 and the heat storage device 26, and the warm air does not hit the positive characteristic heating element 22 and the heat storage device 26 respectively, so that the heat storage device 26 has a large heat dissipation effect and improves the heating capacity. When the heat storage amount of the heat storage device 26 decreases and the temperature of the heat storage device 26 decreases, the temperature of the warm air blown from the second air blowing port 33 on the heat storage device 26 side is the positive temperature coefficient heating element 2
There is a problem in that the temperature is extremely lower than the temperature of the warm air blown from the first blower port 32 on the second side, which gives the user a feeling of cool air despite heating.

For example, the average hot air temperature of a 1200 W electric hot air blower has a specific heat of air of 0.24 kcal / kg ° C., a specific weight of 1.2 kg / m ³ , and 1000 W = 860 kca.
Assuming that the air volume is 0.8 m ³ / min and the room temperature is 25 ° C., [1200 × (860 ÷ 1000) ÷ (0.24 × 1.2 × 60 × 0.8)] + 25 = 99.
7 (° C.) and becomes, on the other hand, well-known magnesium nitrate Mg in the thermal storage device 26 as a latent heat storage material (NO _{3) 2} · 6H ₂
O, phase transition point: 89 ° C., and the temperature efficiency during heat exchange of the heat storage device 26 is 40%, the warm air temperature is 0.4 × (89−25) + 25 = 50.6 (° C.). When the temperature efficiency is low, the temperature of the hot air of the heat storage device 26 is close to 50 ° C., and the temperature is considerably lower than the hot air temperature of 100 ° C. of the electric warmer (the positive temperature coefficient heating element 22), which makes the air feel cold.

Therefore, in the electric air blower of FIG. 6, it is necessary to use the high temperature heat storage device 26 in order to prevent the feeling of cold air, and the heat retention and heat resistance of the warm air noble body 21 become a problem.

The electric hot air blower of the present invention has been made in view of the above problems, and prevents a decrease in heating capacity due to a decrease in power consumption during a combined operation with a heat storage device.
It is an object of the present invention to provide an electric warmer having a heating capacity much larger than that of a normal electric warmer without giving the user a feeling of cool wind.

[0018]

In order to achieve the above object, an electric warmer according to the present invention is provided with a positive temperature heating element and a blower fan for making warm air the air taken in through an intake port in the warmer body. A hot air generating device is provided, and a hot air duct from the hot air generating device to a hot air blower provided on the front surface of the hot air blower body is provided, and the positive characteristic is provided in the air blowing duct. A heating element is provided, and a heat storage device is provided on the intake side of the positive-characteristic heating element, and when the heat storage device and the warm air generation device are used together, the amount of air blown by the blower fan of the warm air generation device is A control unit is provided to control the blower fan so that the amount of blown air is greater than the blown air amount when the warm air generator is operating independently.

Further, a first intake passage for intake air through the heat storage device and a second intake passage for direct intake air without passing through the heat storage device.
An intake passage is provided, and the intake passage is provided so that air is taken from the first intake passage side when the heat storage device and the warm air generating device are used together, and from the second intake passage side when the warm air generating device is operated alone. A switching damper for switching is provided, and a control unit that stores heat in the heat storage device when the warm air generator is operating independently is provided.

[0020]

In the electric warm air blower described above, the control unit increases the amount of air blown by the blower fan during the combined operation of the heat storage device and the warm air generation device, and reduces the power consumption of the positive temperature heating element during the combined operation of the heat storage device. Without increasing the heating capacity to perform heating. Further, it is possible to switch the switching damper when the warm air generator is operating independently, and to store heat in the heat storage device when the warm air generator is independently operated.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A first embodiment of the electric warmer according to the present invention will be described with reference to FIGS. The electric air blower of the present invention includes a warm air generator including a positive temperature characteristic heating element 2 disposed in a warm air source body 1 and a blower fan 3 that blows air heated by the positive temperature characteristic heating element 2. A blower duct 5 that guides warm air blown from the blower fan 3 to a blower port 4 provided on the front surface of the warmer body 1 and a heat storage device 6 disposed in the blower duct 5 are provided. ..

The warm air blower main body 1 is formed in a box shape, the blower port 4 is provided at the lower front portion of the warm air blower main body 1, and the intake port 7 is provided at the lower rear portion thereof.

The blower fan 3 comprises a motor 8 installed on the front plate of the blower duct 5 and a fan 9 fixed to the motor shaft of the motor 8. The blower fan 3
The positive temperature coefficient heating element 2 is disposed in the blower duct 5 at the subsequent stage (blower side).

The heat storage device 6 comprises a heat storage body 10 and a heat storage heater 11 for storing heat in the heat storage body 10. The heat storage device 6 is located on the intake side of the blower fan 3 (the intake port 7). And the blower fan 3), and the positive characteristic heating element 2 is provided on the blowing side of the blower fan 3 (between the positive characteristic heating element 2 and the blowing port 4).

A warm air temperature detection device 12 for detecting the heat radiation state of the heat storage device 6 (the temperature of the hot air heated by the heat radiation of the heat storage device 6) is provided at the subsequent stage of the heat storage device 6, and the temperature is detected. A control device 13 that detects the heat radiation state of the heat storage device 6 based on the detection result of the wind temperature detection device 12 and controls the amount of air blown by the blower fan 3 is disposed on the front plate of the blower duct 5.

The operation of the electric hot air blower having the above configuration will be described.
First, during the combined operation of the heat storage device 6 and the positive temperature coefficient heating element 6, the fan 9 is rotated by the drive of the motor 8 and the indoor air is sucked from the intake port 7 by the drive of the blower fan 3, and the inside of the blower duct 5 is blown. It passes through the heat storage device 6. Then,
The indoor air taken in by the heat radiation of the heat storage device 6 becomes hot air and reaches the positive temperature characteristic heating element 2, which is further heated by the positive temperature characteristic heating element 2 and is blown from the blower port 4 to perform heating. ..

At this time, the temperature of the warm air given to the positive temperature coefficient heating element 2, that is, the temperature of the warm air heated by the heat storage device 6 is detected by the warm air temperature detecting device 12,
The heat radiation state of the heat storage device 6 is detected based on the detection result of the warm air temperature detection device 12, and the rotation speed of the motor 8 of the blower fan 3 is controlled (the higher the detection temperature of the warm air temperature detection device 12, the higher the rotation of the motor 8). The number is controlled to be high), and heating is performed without changing the air flow rate and reducing the power consumption of the positive temperature coefficient heating element 2.

Next, the control of the air flow rate by the temperature detected by the hot air temperature detection device 12 (the inlet temperature of the positive temperature coefficient heating element 2) will be described with reference to FIG.

FIG. 2 shows the amount of blown air passing through the relationship between the power consumption (heat generation amount) of the positive temperature coefficient heating element 2 and the inlet temperature of the positive temperature coefficient heating element 2 (the temperature of the warm air heated by the heat storage device 6). This is expressed as a variable, and as the temperature of the PTC heating element 2 rises due to the characteristics of the PTC heating element 2 and the resistance value increases, that is, as the inlet temperature rises and the air flow rate decreases, the PTC heat generation increases. It can be seen that the power consumption of the body 2 is reduced.

The latent heat storage material magnesium nitrate Mg (NO ₃ ) ₂ .6H is used as the heat storage material 10 of the heat storage device 6.
Explaining the heating capacity when ₂ O, a melting point of 89 ° C., and a transition heat of 159 kj / kg are used, the room air temperature is 25 ° C., the temperature efficiency during heat exchange of the heat storage device 6 is 40%, and 1.2 m ³ When air is blown at a flow rate of 1 / min, the phase change temperature of magnesium nitrate is 89 ° C. during the combined operation of the positive temperature coefficient heating element 2 and the heat storage device 6, so the inlet temperature of the positive temperature coefficient heating element 2 is 0.4 × (89 -25) +25 = 50.6 (° C).

That is, if the heat storage device 6 is blown with 1.2 m ³ / min of air and the heat transfer area is designed so that the temperature efficiency of the heat storage device 6 is 40%, the temperature of the indoor air is 25
When the temperature is ° C, the inlet temperature of the positive temperature coefficient heating element 2 becomes about 50 ° C for a long time during which the heat storage device 6 continues to change phase,
The power consumption of the positive temperature coefficient heating element 2 is about 1200 W.

As for the heating capacity per hour at this time, the specific heat of air is 0.24 kcal / kg ° C. and the specific weight is 1.2 k.
If g / m ³ and 1000 W = 860 kcal, then 0.24 × 1.2 × 60 × 1.2 × (50.6-25) × (1000 ÷ 860) + 1200 = 1
817 (W), the heating capacity is about 50 in comparison with the conventional electric air blower, which has a heating capacity of 1200 W at room temperature of 25 ° C.
% Will increase.

When the latent heat exchange is completed and the temperature of the heat storage device 6 decreases, the inlet temperature of the positive temperature coefficient heating element 2 also begins to gradually decrease from 50 ° C., and the inlet temperature is about 45 ° C.
Then, since the power consumption of the positive temperature coefficient heating element 2 becomes close to 1250 W, the blowing amount of the blowing fan 3 is 1.2 m ³ /
Min to 1.0 m ³ / min, and the power consumption of the positive temperature coefficient heating element 2 is controlled to 1200 W or less.

Further, when the temperature of the heat storage device 6 decreases and the inlet temperature of the positive temperature coefficient heating element 2 reaches about 33 ° C., the power consumption of the positive temperature coefficient heating element 2 increases again to approach 1250 W. the blowing amount of the blower fan 3 is controlled to 1.0 m ³ / min to 0.8 m ³ / min, to control the power consumption of the positive characteristic heat generating element 2 below 1200 W, it exceeds the capacity of the household power outlet and breakers Is being prevented.

At this time, the control device 13 controls the amount of air blown by the blower fan 3 so that the hot air temperature is detected by the hot air temperature detection device 1.
2 is detected, and the control device 13 controls the rotation speed to change the blown air amount by performing phase control, duty control, or switching of the motor winding of the motor 8 of the blower fan 3.

In this way, the temperature of the hot air heated by the heat storage device 6 is detected, and the power consumption of the positive temperature coefficient heating element 2 is controlled to 1200 W regardless of the temperature of the hot air.
In the combined operation of the heat storage device 6 and the positive temperature coefficient heating element 2, the heating can be performed by the hot air with a high heat amount without lowering the heating capacity.

In the above description, the heat storage device 6, the blower fan 4, and the positive temperature coefficient heating element 2 are arranged in this order from the upstream of the wind, but the blower fan 4, the heat storage device 6, and the positive temperature coefficient heating element 2 are respectively arranged in this order. Even if it is provided, the same effect can be obtained.

A second embodiment of the electric warmer according to the present invention will be described with reference to FIG. The electric air blower of the present invention includes a warm air generator including a positive temperature characteristic heating element 2 disposed in a warm air source body 1 and a blower fan 3 that blows air heated by the positive temperature characteristic heating element 2. A blower duct 5 that guides warm air blown from the blower fan 3 to a blower port 4 provided on the front surface of the warmer body 1 and a heat storage device 6 disposed in the blower duct 5 are provided. ..

A first intake port 14 is provided at the lower rear portion of the warm air fan body 1 and a second intake port 15 is provided at the upper rear portion thereof. The intake side of the blower fan 3 communicates with the first intake port 14 and the heat storage device. 6, a first intake passage 16 and a second intake port 1 described above.
And a second intake passage 17 communicating with No. 5 is provided.

The second intake passage 17 and the first intake passage 16
And a switching damper 18 for switching between the second characteristic and the second characteristic when the positive characteristic heating element 2 is operated independently.
The intake port 15 is opened and the first intake passage 16 is closed, and the second intake port 15 is closed and the first intake passage 16 is closed during the combined operation of the positive temperature coefficient heating element 2 and the heat storage device 6. The control device 13 controls the switching.

The operation of the electric warmer having the above structure will be described.
During the combined operation of the positive temperature coefficient heating element 2 and the heat storage device 6,
The switching damper 18 is switched to close the second intake port 15 and open the first intake passage 16 to form an intake path similar to that of the first embodiment, and its operation is also similar to that of the first embodiment. To do.

When the positive characteristic heating element 2 is operated independently, the switching damper 18 is switched to open the second intake port 15 and close the first intake passage 16,
Indoor air is directly taken in from the second intake port 15 to perform heating.

At this time, as in the case where the heating capacity of the positive-characteristic heating element 2 is "weak" or "medium", that is, when the power consumption has a margin, the heat storage heater 11 is energized and the heat storage device 6 is operated. To store heat.

[0044]

EFFECTS OF THE INVENTION Since the electric air blower of the present invention is constructed as described above, it is possible to prevent the heating capacity from being lowered due to the reduction of the power consumption of the positive temperature coefficient heating element when the heat accumulator is used together, and to give the user a feeling of cool air. It is possible to perform heating with a much higher amount of hot air than a conventional electric air blower without giving it, and even when using a heat storage device, the power consumption of the positive temperature heating element is less than the capacity of general household outlets and breakers. Can be controlled to be very safe.

Further, the heat of the heat storage device can be stored when the positive temperature coefficient heating element is operated alone, and the combined operation of the heat storage device and the positive temperature coefficient heating element can be performed when necessary.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing a first embodiment of an electric warmer according to the present invention.

FIG. 2 is a characteristic diagram showing power consumption of the electric warmer according to the present invention.

FIG. 3 is a schematic cross-sectional view showing a second embodiment of the electric warmer of the present invention.

FIG. 4 is a schematic cross-sectional view showing a first example of a conventional electric warmer.

FIG. 5 is a schematic cross-sectional view showing a second example of a conventional electric warmer.

FIG. 6 is a schematic cross-sectional view showing a third example of a conventional electric warmer.

FIG. 7 is a characteristic diagram showing power consumption of a conventional electric warmer.

[Explanation of symbols]

 1 Main unit of hot air generator 2 Positive heating element 3 Blower fan 4 Blower port 5 Blower duct 6 Heat storage device 7 Inlet port 10 Heat storage material 11 Heat storage heater 12 Hot air temperature detection device 13 Control device 14 First air inlet port 15 Second air inlet port 16 First intake passage 17 Second intake passage 18 Switching damper

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shingo Ehara 22-22 Nagaike-cho, Abeno-ku, Osaka City, Osaka Prefecture

Claims (2)

[Claims] 1. A warm air generator including a positive-characteristic heating element and a blower fan for turning the air sucked in from the intake port into warm air in the warm air blower main body, and the temperature from the warm air generator is increased. In an electric warmer provided with a blower duct for guiding wind to a blower port provided on the front face of the warmer body, the positive characteristic heating element is arranged in the blower duct, and the positive characteristic heating element is provided on the intake side. A heat storage device is provided, and the air flow rate of the blower fan of the hot air generation device during the combined operation of the heat storage device and the hot air generation device is larger than the air flow amount of the hot air generation device during the independent operation. An electric warmer comprising a control unit for controlling the blower fan. 2. The electric warmer according to claim 1, further comprising a first intake passage for performing intake air through a heat storage device and a second intake passage for performing direct intake air without passing through the heat storage device. When operating in combination with the hot air generator, the first
A switching damper is provided to switch the intake passage from the side of the intake passage to switch the intake passage so that air is taken from the side of the second intake passage when the warm air generator is operating independently. An electric hot air blower characterized by being provided with a control unit for performing the operation.