JP2726174B2 - Electric hot air heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention provides a blower and a heating element in a ventilation path communicating from an air suction port of a main body to a hot air outlet, and further includes a blower and a heating element from an upstream side of the heating element in the ventilation path in the ventilation path.
Thermal storage hand that can be ventilated in the branched bypass ventilation path
A step is provided, and the air is blown from the air inlet to the room by the blower.
Direct air to the heating element and / or the heat storage means
After blowing and heating, blow out from the hot air outlet
The present invention relates to an electric hot-air heater for heating the interior of a room, and aims to enhance the heating capacity especially at the start of operation.

[0002]

2. Description of the Related Art Conventional portable electric heaters include a reflection type and a convection type. At present, a ceramic heating element is provided in a ventilation passage communicating from an air inlet of a main body to a hot air outlet. A forced convection type electric hot air heater called an electric ceramic fan heater provided with a heating element such as the above and a blower is often used. By the way, the electric hot air heater as described above has a maximum of 1.2 kW (1032 kW) due to the limitation of the electric capacity of the electric outlet circuit of the general household power supply.
Only kcal / h) was consumed, and the heating capacity was relatively low. for that reason,
The above-mentioned electric warm air heater was generally used as spot heating or auxiliary heating. The general heating capacity used for catalog display of the electric hot air heater as described above is distinguished between a warm region (indoor and outdoor temperature difference of 15 ° C) and a cold region (indoor and outdoor temperature difference of 30 ° C). Calculated from the following values: Warm area: wooden house 350 kcal / tatami, concrete house 250 kcal / tatami Cold area: wooden house 330 kcal / tatami, concrete house 210 kcal / tatami Here, there is a difference in the heating capacity between the above-mentioned warm region and the cold region, because the structure of the house in the cold region is more insulated than that of the house in the warm region, for example, with heat insulation of the walls and double windows. This is because the structure has a good heat insulating effect.

[0003]

The above-mentioned heating capacity includes a heating capacity for raising the room temperature to the set room temperature in real time and a heating maintenance capacity for maintaining the room temperature at the set room temperature. Is required, and the above-mentioned value of the heating capacity is a value calculated by doubling the amount of heat required for the heating maintenance capacity. Therefore, if only the general heating temperature is maintained by the above conventional electric hot air heater,
Only about 1/2 of the above heating capacity is required. For example,
When the heating capacity when heating a concrete house such as a condominium in a warm region using an electric hot air heater with a power consumption of 1.2 kW (1032 kcal / h) is calculated using the above value, the above electric hot air heating is obtained. Although the machine has a heating capacity of about 8 tatami mats, it has only a heating capacity of about 4 tatami mats. On the other hand, the electric hot air heater does not always need the above-mentioned heating capability, and is not necessary except at the time of starting operation or when the room temperature falls from the set room temperature. Therefore, there was a surplus in the power that can be consumed except at the start of the operation. In addition,
Then, the surplus electricity at midnight is used to store heat in the heat storage body at night,
The heat stored in the heat storage element is mainly used to supplement the auxiliary heating element.
A regenerative warm air heater that uses auxiliary heating for heating is known
However, this is because heat stored in the heat storage
When heating using only the auxiliary heating element
Is similar to an electric hot air heater that does not use a heat storage
Problems arise. Accordingly, an object of the present invention is to increase the temperature of a relatively large room by utilizing the surplus power when the heating capacity is not required, even if the heating element has a small capacity. It is an object of the present invention to provide an electric hot air heater capable of performing the above-mentioned operations.

[0004]

In order to achieve the above-mentioned object, the main means adopted by the present invention is as follows. The gist is that a blower and a heat generator are provided in a ventilation passage communicating from an air inlet of a main body to a hot air outlet. And a heat storage means provided so as to be able to ventilate in a bypass ventilation passage branched from an upstream side of the heating element in the ventilation passage in the ventilation direction, and the blower blows indoor air from the air suction port into the heat generation unit. after heating and blowing toward the body and / or the heat storage means, in electrical warm air heater for performing indoor heating by blown from the warm air blowing port, power consumption of the upper Symbol heating element is smaller than a predetermined value A heat storage control means for storing heat in the heat storage means using the surplus power, and a ventilation path for switching a ventilation path to the bypass ventilation path according to a room temperature and a heat storage state of the heat storage means. It is constructed as an electric warm-air heating apparatus according to the point at which it and means instead. In addition,
The heat control means is also provided when the electric hot air heater is stopped.
The heat storage means can be configured to store heat. It should be noted that silicon carbide may be used as a material of the heat storage means, and the silicon carbide itself may be used as a heating element.

[0005]

In the electric hot air heater according to the present invention, when the heat storage means in the bypass ventilation path is not energized to the heating element,
Or, when the power consumption of the heating element is smaller than a predetermined value,
That is, when there is a surplus in this power consumption ,
Heat is stored by control . And the air passage switching means
In accordance with the indoor temperature and the heat storage state of the heat storage means, for example, when the difference between the detected indoor temperature and a preset set indoor temperature is large and the heat storage means is at or above a predetermined temperature, the ventilation path is switched to the bypass ventilation. Switch to the road. This gives
The warm air heated by the heating element and the warm air heated by the heat storage means are used together. When silicon carbide is used as the material of the heat storage means, the silicon carbide functions as the heat storage means and an electric current flows through the silicon carbide.
This also function as a heating element for heating itself by to such
Since bets can, a configuration for realizing these functions as compared with the case of providing separately, the configuration is compact, it is possible to reduce the heat loss.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention. The following embodiment is an example embodying the present invention and is not intended to limit the technical scope of the present invention. Here, FIG. 1 is an external view showing an electric hot air heater according to one embodiment of the present invention, FIG. 2 is a structural view of the schematic configuration of the electric hot air heater in a side cross section, and FIG. It is a block diagram which shows the control system of a warm air heater. As shown in FIGS. 1 and 2, the electric hot air heater H according to the present embodiment includes a main switch 2, an operation switch 3, and a room temperature setting knob 24 at an upper portion of a front surface of a main body 1 which is a rectangular housing. Operation unit 4
An outlet 6 for blowing out warm air 5 (FIG. 2) for heating is provided below the front surface. The outlet 6 has become more and upper heat storage temperature air outlet 7 _a and lower hot air main outlet 7 _b (temperature air blowing port). And in the lower part in the main body 1,
The main air passage 10 which communicates via an opening A from the air inlet 30 to the hot air main outlet 7 _b (air passage) is provided. A blower 8 is provided near the air suction port 30 of the main ventilation path 10, and a heating element 9 for hot air, such as a ceramic heating element, is provided near the main air outlet 7 _b . Above the main ventilation path 10, a bypass ventilation path 13 is provided, which branches off from the upstream side of the heating element 9 for warm air in the main ventilation path 10 in the ventilation direction and is capable of flowing the ventilation from the blower 8. The bypass air passage 13 is provided to communicate with the branch portion of the main air passage 10 to the heat storage temperature air outlet 7 _a of the air outlet 6, taken air mixing chamber 20 to the heat storage temperature air blowing port 7 _a vicinity below I have. The heat storage box 12 is formed in a part of the bypass ventilation passage 13. A heat insulating material 17 is attached to the entire outer periphery of the heat storage box 12. In the upper opening C of the heat storage box 12, an inlet damper 1 having a heat insulating material is provided.
8 is openably provided in the axial 18 _a around the outlet damper 19 similarly provided with a heat insulating material in the lower opening D is provided so as to be freely opened and closed in the axial 19 _a around. The air mixing chamber 20 and the branch portion communicate with each other through an opening B, and a mixing damper 21 is provided in the opening B so as to be openable and closable.

In the heat storage box 12, a plurality of heat storage heating elements 11 are arranged with a space 15 through which air can pass.
The heat storage heating element 11 is made of silicon carbide (SiC), which has a function as a heat storage as well as a function of generating heat when energized. Further, a heat storage thermostat 16 for controlling the heat storage heating element 11 and the heat storage box 12 at a constant temperature, and a heat storage sensor 22 for detecting the temperature inside the heat storage box 12 are provided in the heat storage box 12. I have. The heat storage temperature is set to a temperature close to the heat-resistant temperature of the heat storage heating element 11 (for example, about 300
５００500 ° C.). On the back surface of the main body 1, a room temperature sensor 23 for detecting the room temperature is provided. FIG. 3 shows a control system of the electric hot air heater H.
Is shown in the block diagram of FIG. In the above block diagram, the control circuit 29 for controlling the operation of the electric hot air heater H is provided with the operation switch 3, the heat storage thermostat 16, the hot air heating element 9, the heat storage sensor 22, the room temperature sensor 23, and the inlet damper 18. , The drive source of the outlet damper 19, and the drive source of the mixing damper 21 are electrically connected to each other. The heat storage heating element 11 is a heat storage thermostat 16.
Is connected to the operation switch 3 via the. Further, the blower 8 is directly connected to the operation switch 3.

[0008] The electric hot air heater H of the present embodiment is configured as described above. The operation of the electric hot air heater H will be described below. The operation switch 3 is configured to be switchable between a “stop mode” and an “operation mode”, and is switched to the “stop mode” manually or by turning off the main switch 2. And
When the operation switch 3 is in the stop mode, the heat storage box 1
The second inlet damper 18 and the second outlet damper 19 are closed, thereby sealing the inside of the heat storage box 12. The mixing damper 21 also closes the opening B. Therefore,
When the main switch 2 is turned on, the heat storage heating element 11 is energized via the operation switch 3 and the heat storage thermostat 16 to generate heat. When the heat storage heating element 11 reaches the heat storage temperature, the heat storage thermostat 16
This temperature is maintained by N · OFF. The heat storage heating element 11 stores its own heat as it is by using a heat storage function provided also. As described above, the heat storage heating element 11 is stored in advance before the heating operation is started, and is kept warm by the heat storage box 12.

Subsequently, the operation switch 3 is set to the "operation mode".
, The control circuit 29 and the blower 8 are energized, and each starts operating. Also, the heat storage heating element 11
Is also turned off. Thereby, the heating element 9 for hot air is energized by the control circuit 29 (heat storage control means) to generate heat. At the same time, the air 25 blown by the blower 8
Is heated when passing through the heating element 9 for hot air,
become a _b, it is blown into the room from the hot air main outlet 7 _b. At this time, the control circuit 29 reduces the power consumption of the heating element 9 for hot air, for example, so that the room temperature detected by the room temperature sensor 23 becomes the preset room temperature from the room temperature setting knob 24. Automatic control is performed according to the difference between the detected room temperature and the set room temperature. Further, the control circuit 29
In accordance with the power consumption of the heating element 9 for hot air, it is determined whether the operation mode is the weak operation mode with excess power consumption or the strong operation mode in which the power consumption is close to the electric capacity. At the beginning of the operation, since the difference between the detected room temperature and the set room temperature is relatively large, the operation mode at that time is determined to be the strong operation mode, and the control circuit 29 does not supply power to the heat storage heating element 11. Next, the control circuit 29 determines that the temperature in the heat storage box 12 detected by the heat storage sensor 22 is equal to or higher than a predetermined temperature, and the detected room temperature is lower than the set room temperature by a certain temperature or more. Is determined, power is supplied to the respective drive sources of the inlet damper 18, the outlet damper 19, and the mixing damper 21 to open them. As a result, the room air blown into the bypass ventilation passage 13 from the blower 8 becomes hot air 27 when flowing between the heat storage heating elements 11 in the heat storage box 12 and flows into the air mixing chamber 20.
On the other hand, some of the indoor air from the blower 8 flows into the air mixing chamber 20 through the opening B, by diluting the hot air 27 from the heat storage box 12, the heat storage temperature air blowing port 7 _a as warm air 26 _a suitable temperature From the room. As described above, the hot air 26 _b from the heating element 9 for hot air and the hot air 26 _a from the heating element 11 for heat storage are simultaneously blown into the room, so that, for example, a large temperature rising capacity as in the beginning of the operation is obtained. Is required, the hot air 5 having a high calorific value can be supplied to the room.

On the other hand, when the room is gradually heated and the difference between the detected room temperature and the set room temperature becomes small and it is determined that the operation mode is the weak operation mode, the excess electric power at this time with respect to the electric capacity is calculated. Electric power is supplied from the control circuit 29 to the heat storage heating element 11. That is, the heating element 9 for hot air (heating element)
According to the present invention, the heat storage heating element 11 disposed so as to be able to ventilate the heat storage box 12 of the bypass ventilation path 13 so as to store heat according to the power consumption of the hot air or when the heating element 9 for hot air is de-energized. It is a heat storage means. When continues to blow in the heat storage heating element 11, the temperature in the heat storage box 12 is below the predetermined temperature, it is inconvenient will be cool air blown from the heat storage temperature air blowing port 7 _a. The heat storage heating element 11
Is in a sufficient heat storage state, but the room temperature is approaching the set room temperature, and there is a case where hot air with a high calorific value is not required. Under these conditions, the control circuit 29 automatically closes the inlet damper 18, the outlet damper 19, and the mixing damper 21. As a result, the ventilation path to the bypass ventilation path 13 is switched to “closed”, and the bypass ventilation path 1
3 is stopped, and the room is kept heated by warm air only from the main ventilation passage 10. That is, the inlet damper 1
8, exit damper 19, heat storage sensor 22, room temperature sensor 23
The configuration including the control circuit 29 and the control circuit 29 is an example of the ventilation path switching means for switching the ventilation path to the bypass ventilation path according to the indoor temperature and the heat storage state of the heat storage means. As described above, the electric hot air heater H according to the present embodiment stores heat in the heat storage heating element 11 in the heat storage box 12 using the surplus power before the start of operation or in the weak operation mode, and When the temperature is raised or when the room temperature is lower than the set room temperature by a certain temperature or more, the air is passed through the heat storage box 12, taken out as warm air using the heat storage, and used together with the warm air from the warm air heating element 9. It is possible to obtain hot air with a high calorific value while leveling power consumption over time. Therefore, the heating element 9 for hot air
Is a relatively small capacity regulated by the electric capacity, the electric hot-air heater H of this embodiment can increase the temperature-raising ability at room temperature.

Further, since the heat storage heating element 11 made of silicon carbide has both functions of a heat storage element and a heating element, the heat storage element 11 is different from the case where the heat storage element and the heating element are separately provided. As a result, heat can be efficiently stored without heat conduction loss, and the installation space can be reduced. In the above embodiment, in order to have a space through which air can pass,
A plurality of heat storage heating elements 11 were installed at intervals.
The invention is not limited to this, and the heat-generating body for heat storage may be one that is integrally formed in a honeycomb shape or an uneven shape and can be ventilated.
In the above embodiment, the control circuit 29 automatically controls the power consumption of the heating element 9 for hot air. However, as the heating element for hot air, for example, its own resistance suddenly increases at a predetermined temperature. The power consumption of the heating element may be controlled by changing the amount of air blown from the blower 8 using a PTC-type heating element that continuously generates heat at a temperature.

[0012]

Since the present invention is constructed as described above, the surplus electric power before the start of operation or during operation at a low output is stored as heat in the heat storage means, so that the ability to raise the temperature to room temperature is required. It is possible to perform heating using both the heat storage and the heat from the heating element at the start of operation. Therefore, the room temperature of a relatively large room can be brought close to, for example, a preset room temperature, even though the capacity of the heating element is relatively small, for example, restricted by the electric capacity of the electric outlet circuit. Further, since the material of the heat storage means is silicon carbide, the heat storage means can also function as a heating element and a heat storage element. Therefore, compared with the case where the heating element and the heat storage element are separately configured, loss of heat conduction is small and heat can be stored with high thermal efficiency. Further, the installation space for the heat storage means can be reduced.

[Brief description of the drawings]

FIG. 1 is an external view showing an electric hot air heater according to one embodiment of the present invention.

FIG. 2 is a configuration diagram showing a schematic configuration of the electric hot air heater in a side cross section.

FIG. 3 is a block diagram showing a control system of the electric hot air heater.

[Explanation of symbols]

H ... electric warm-air heating apparatus 1 ... main body 3 ... operation switch 7 _a ... heat storage temperature air blowing port 7 _b ... Yutakakazenushi outlet (warm air blowing port) 8 ... blower 9 ... hot air for heating element (heating element) 10 ... Main ventilation path (ventilation path) 11: heat generating element for heat storage (heat storage means) 12: heat storage box 13: bypass ventilation path 18: inlet damper 19: outlet damper 22: heat storage sensor 23: room temperature sensor 29: control circuit (heat storage control means) 30 ) Air inlet

Claims (3)

(57) [Claims] 1. A blower and a heating element are provided in a ventilation path communicating from an air suction port of a main body to a hot air outlet, and further, a ventilation can be provided in a bypass ventilation path branched from an upstream side of the heating element in the ventilation direction of the ventilation path. After the indoor air from the air suction port is blown toward the heating element and / or the heat storage means by the blower and heated, the indoor air is blown out from the hot air outlet to blow the indoor air. electric warm-air heating machines odor performing heating Te, when the power consumption of the upper Symbol heating element is smaller than the predetermined value, a heat storage control means for the heat storage to the heat storage means using the surplus power amount, the room temperature and the heat storage unit And an air flow path switching means for switching an air flow path to the bypass air flow path according to the heat storage state of the electric hot air heater. 2. The air inlet of the main body communicates with the hot air outlet.
A blower and a heating element are provided in the ventilation path
Bypass passage branching from the upstream side in the air blowing direction of the heating element
A heat storage means provided to allow ventilation in the air path is provided,
Air from the air inlet through the heating element
And / or heated by blowing air toward the heat storage means.
Later, the room is heated by blowing it out from the hot air outlet.
In the electric warm-air heating apparatus which performs, when stopping the electric temperature air heater, and the power consumption of the heating body
Is smaller than the predetermined value, the surplus power is used to calculate
Heat storage control means for storing heat in the heat storage means, and the above-mentioned battery according to the indoor temperature and the heat storage state of the heat storage means.
Ventilation path switching means for switching the ventilation path to the path ventilation path
An electric hot air heater comprising: 3. The material of the heat storage means is silicon carbide.
Wherein the silicon carbide itself is used as a heating element.
Is an electric warm air heater according to 2.