JPH09280659A - Enclosed hot air heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable protection from cold resultant from a sharp drop in a room temperature by means of the radiation of a heat storing body when combustion comes to a halt by providing the heat storing body which radiates heat by feeding air of a fan when the combustion of a burner comes to a halt. SOLUTION: In an enclosed hot air heater 3 which comprises a burner 1 which burns a fuel and a first heat exchanger 3 which heat-exchanges combustion gas with the burner 1 and a fan 7 which feeds air to the first heat exchanger 3, a heat storing body 10 is mounted on the first heat exchanger 3 so that the heat storing body 10 ma radiate heat by feeding air of the fan 7 when the combustion by the above burner 1 comes to a halt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a closed-type hot air heater used as a heating appliance, and more particularly to a method for suppressing a rapid decrease in heat generation when the room thermostat stops the operation.

[0002]

2. Description of the Related Art A conventional closed hot air heater is shown in FIGS.
1 will be described. A conventional closed hot air heater is configured as shown in FIG. 9, and in FIG. 9, 1 is a burner, 2 is a combustion chamber arranged above the burner 1, and 3 is in communication with the combustion chamber 2. The first heat exchangers 4 are communicating with the first heat exchanger 3 and are second heat exchangers arranged below the first heat exchanger 3. Also,
Reference numeral 5 denotes a combustion blower, which functions to take in air necessary for combustion from the outside, supply it to the burner, and discharge the combustion gas to the outside. In addition, 6 is a combustion gas burned in the burner 1.

Further, 7 is a convection blower for blowing air to the first heat exchanger 3 and the second heat exchanger 4, 8 is a louver provided at a hot air blowing port, and 9 is air blown by the convection blower 7. is there.

In the sealed hot air heater having the above structure, the high temperature combustion gas 6 burned in the burner 1 heats the combustion chamber 2, the first heat exchanger 3 and the second heat exchanger 4 to the outside of the room. Is discharged. On the other hand, the air 9 sent by the convection blower 7
Is warmed by passing through the surfaces of the combustion chamber 2, the first heat exchanger 3, and the second heat exchanger 4 which have become high temperature by heat exchange with the combustion gas 6, and is passed through the louver 8 to be delivered indoors. And heating the room. In this case, in order to control the room temperature, the room temperature is detected by a room thermistor (not shown), and the control means (not shown) adjusts the heating power to be strong or weak.
Alternatively, the combustion is stopped.

As shown in FIG. 10, when burning with strong heat,
When the room temperature detected by the room thermistor reaches the set temperature, it switches to weak automatically. Then, even if it becomes weak, the room temperature continues to rise due to residual heat, and if the temperature rises above a set temperature (1.5 ° C), the fire is extinguished. Furthermore, if the temperature drops to the set temperature after extinguishing the fire, the heat power will switch to weak. Then, when the room temperature falls and falls below the set temperature by a constant temperature (1 ° C.), the heating power becomes strong.

[0006] When the outside temperature is high, such as at the beginning of the heating season or at the end of the heating season, the operation is weak and the OFF operation is often repeated.

[0007]

With the above-mentioned structure, the conventional closed-type hot air heater is weak, and when it is turned off, the room temperature is set to the set temperature and set temperature as shown in FIG. It will vary between + 1.5 ° C. But,
In fact, the room thermo senses the room temperature and the heat power switches,
Since there is a slight delay before the room temperature starts to change, the change in room temperature becomes large. That is, when the thermal power is switched from low (low) to OFF as shown in FIG. 11, room temperature rises above + 1.5 ° C. by about ΔT ₁ due to residual heat. However, when the heating power is turned off, the room temperature suddenly drops and the convection blower 7 is stopped, so that the air stagnates and the detection of the room thermistor is greatly delayed. Further, since it takes a long time to start combustion, the decrease in room temperature is much lower than ΔT ₂ and the set temperature, and there is an inconvenience that it feels cold.

The present invention was devised in view of such inconvenience, and an object of the present invention is to provide a closed hot air heater capable of suppressing a decrease in room temperature due to burner extinction during temperature control. .

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the hermetically sealed hot air heater according to the present invention provides a burner for burning fuel and heats a gas burned by the burner. A closed warm air heater comprising a heat exchanger to be exchanged and a blower for blowing air to the heat exchanger, which is provided with a heat storage body that radiates heat by blowing air from the blower when combustion by the burner is stopped.

[0010] The invention described in claim 2 is based on claim 1.
In addition to the closed hot air heater described in (1), a heat storage body is attached to the heat exchanger.

Further, in the invention according to claim 3, in addition to the closed type hot air heater according to claim 1, a heat storage body is arranged in the vicinity of the heat exchanger.

Further, the invention according to claim 4 is the invention according to claim 3.
In addition to the closed-type warm air heater described in (3), a plurality of grooves capable of passing air are formed between the heat exchanger and the heat storage body.

According to a fifth aspect of the present invention, in addition to the sealed hot air heater according to the first aspect, there is provided a heat radiation fin that connects the heat storage body and the heat exchanger so that ventilation is possible. is there.

Further, in the invention of claim 6, in addition to the closed type hot air heater of claim 1, a heat-resistant heat storage material is used for the heat storage body.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In each of the embodiments of the present invention, the same parts as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted.

[First Embodiment] A first embodiment of the sealed hot air heater of the present invention will be described with reference to FIG. In FIG. 1, reference numeral 10 denotes a heat storage body arranged so as to come into contact with the upper surface of the first heat exchanger 3, and the heat storage body 10 is a metal box body in which a heat storage material such as magnesium oxide is sealed. . In addition, the heat storage material sealed in the heat storage body needs to have sufficiently high heat resistance because the first heat exchanger 3 has a high temperature.
A metal oxide or an inorganic metal salt (lithium nitrate, magnesium nitrate hexahydrate, etc.) may be appropriately used.

In the closed hot air heater of the first embodiment, the high temperature combustion gas 6 burned in the burner 1 heats the combustion chamber 2, the first heat exchanger 3 and the second heat exchanger 4. Is discharged outside the room. At this time, the heat storage body 10 arranged in the first heat exchanger 3 is also heated, and the heat storage body 10 stores heat. On the other hand, the air 9 sent by the convection blower 7 is warmed by passing through the surfaces of the combustion chamber 2, the first heat exchanger 3, and the second heat exchanger 4, which are at high temperatures, and is warmed by the louver 8 to the room. To heat the room.

On the other hand, also in the sealed hot air heater of the first embodiment, the burner 1 is extinguished when the room temperature rises by 1.5 ° C. above the set temperature. However, when the burner 1 is extinguished, the convection blower 7 continues to rotate without being stopped, so that a rapid drop in room temperature due to the heat released from the heat storage body 10 can be suppressed. Further, since the convection blower 7 is also operating, there is air flow, the delay in temperature sensing of the room thermistor is reduced, and the decrease in room temperature can be reduced as shown by ΔT ₂ in FIG.

[Second Embodiment] A second embodiment of the closed type hot air heater of the present invention will be described with reference to FIG. In FIG. 3, 10 is a heat storage body arranged in the air passage above the first heat exchanger 3, and is arranged in the vicinity of the first heat exchanger 3 via a gap S through which the air 9b passes. As the heat storage material, the one shown in the first embodiment is used.

When air is passed through the gap S as described above,
The heat radiation area of the heat storage body is increased, and the heat radiation amount can be increased when combustion of the burner is stopped in temperature control. In addition, at the start of combustion, until the heat storage body 10 stores heat, in the first embodiment, the first heat exchanger 3 does not heat the air 9a and the warm air temperature decreases, but the gap S Since the first heat exchanger directly heats the air 9b passing through the gap S by providing it, the decrease in the temperature of the warm air is small.

However, in the second embodiment,
Since the heating of the heat storage body 10 is due to the radiant heat of the first heat exchanger 3, it takes time to store the heat. Therefore, a third embodiment for solving this will be described below.

[Third Embodiment] A third embodiment of the hermetic hot-air heater according to the present invention will be described with reference to FIGS. 4 to 7.
In FIG. 4, reference numeral 10 denotes a heat storage body arranged so as to contact the upper surface of the first heat exchanger 3. As a heat storage material,
The one shown in the first embodiment is used.

Then, as shown in FIG. 5, a plurality of grooves 12 are formed on the contact surface between the heat storage body 10 and the first heat exchanger 3 on the heat storage body 10 side.
And the heat storage body 10 is disposed so that the air 9b passes through the groove 12. Further, since the convex portion 13 of the heat storage body is arranged so as to be in contact with the first heat exchanger 3, the heating of the heat storage body 10 is due to the radiant heat from the first heat exchanger 3 and heat conduction, and It takes less time to store heat in the body 10,
Furthermore, since the air 9b blown through the groove 12 passes,
The decrease in warm air at the start of combustion can be suppressed, and the groove 12 increases the heat radiation area of the heat storage body 10, so that the decrease in room temperature at the time of combustion stop can be further reduced.

Further, as shown in the modified example of FIG. 6, a groove 14 is formed on the first heat exchanger 3 side, or as shown in another modified example of FIG. 7, a groove 13 is formed on the heat storage body 10 side. , First heat exchanger 3
The groove 14 may be formed on the side.

[Fourth Embodiment] A fourth embodiment of the hermetic hot-air heater of the present invention will be described with reference to FIG. In FIG. 8, a radiation fin 16 is provided between the heat storage body 10 and the first heat exchanger 3 so that ventilation can be performed. The heat storage body 10 is
Since the radiation fins 16 support the first heat exchanger, even if the first heat exchanger 3 and the heat storage body 10 are spaced apart from each other,
Heat can be conducted from the first heat exchanger 3 to the heat storage body 10 via the heat radiation fins 16, and the heat storage body 10 can be firmly supported.

In each of the above embodiments, the heat storage body 1
A heat radiation fin may be formed on the upper surface of 0.

[0027]

Since the hermetic hot-air heater of the present invention is configured as described above, according to the invention of claim 1, the burner burning the fuel and the gas burned by the burner are heat-exchanged. In a closed warm air heater comprising a heat exchanger and a blower that blows air to the heat exchanger, since a heat storage body that dissipates heat by the air blow of the blower when combustion by the burner is stopped is provided, the heat storage body when the combustion is stopped. It is possible to further dissipate heat and prevent cold caused by a large drop in room temperature.

According to the second aspect of the invention, since the heat storage body is attached to the heat exchanger, heat can be efficiently stored in the heat storage body.

According to the third aspect of the invention, since the heat storage body is arranged in the vicinity of the heat exchanger, heat can be stored without obstructing the air blow by the air blower.

Further, according to the invention as defined in claim 4, since a plurality of grooves capable of ventilating are formed between the heat exchanger and the heat storage body, the heat storage body can be efficiently carried out without significantly obstructing the air blow by the blower. Can store heat.

Further, according to the invention of claim 5, since the heat dissipating fins are provided so as to allow ventilation between the heat accumulating body and the heat exchanger, heat can be efficiently accumulated in the heat accumulating body without obstructing ventilation by the blower. Further, heat can be efficiently dissipated from the heat storage body.

Further, according to the invention of claim 6, since a heat-resistant heat storage material is used for the heat storage body, heat can be stored without decomposition even if it is heated to high heat by the heat of the heat exchanger.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a sealed hot air heater according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a time chart showing changes in room temperature of the closed-type warm air heater of FIG.

FIG. 3 is a side sectional view showing a sealed hot air heater according to a second embodiment of the present invention.

FIG. 4 is a side sectional view showing a sealed hot air heater according to a third embodiment of the present invention.

5 is a front view showing a first heat exchanger and a heat storage body of FIG. 3. FIG.

FIG. 6 is a front view showing a first heat exchanger and a heat storage body of a modified example of the third embodiment.

FIG. 7 is a front view showing a first heat exchanger and a heat storage body of another modification of the third embodiment.

FIG. 8 is a front view showing a first heat exchanger and a heat storage body of a fourth embodiment.

FIG. 9 is a side sectional view showing an overall structure of a conventional closed-type warm air heater.

FIG. 10 is an explanatory diagram showing the relationship between the set temperature and the combustion thermal power of the closed warm air heater of FIG. 9.

FIG. 11 is a time chart showing changes in room temperature of the closed warm air heater of FIG. 9.

[Explanation of symbols]

 1 Burner 2 Combustion chamber 3 1st heat exchanger 4 2nd heat exchanger 5 Combustion blower 6 Combustion gas 7 Convection blower 8 Louver 9 Air 10 Heat storage body 12 Groove 13 Convex part 16 Radiating fin S S gap

Claims (6)

[Claims] 1. A sealed hot air heater comprising a burner for burning fuel, a heat exchanger for exchanging heat with the gas burned by the burner, and a blower for blowing air to the heat exchanger. A closed hot-air heater including a heat storage body that radiates heat when the blower stops. 2. The closed hot air heater according to claim 1, wherein a heat storage body is attached to the heat exchanger. 3. The closed hot air heater according to claim 1, wherein a heat storage body is arranged near the heat exchanger. 4. The sealed hot air heater according to claim 3, wherein a plurality of grooves capable of passing air are formed between the heat exchanger and the heat storage body. 5. The hermetic hot-air heater according to claim 1, further comprising a radiation fin that connects the heat storage body and the heat exchanger to allow ventilation. 6. The closed-type warm air heater according to claim 1, wherein a heat-resistant heat storage material is used for the heat storage body.