JP3965939B2 - Hot air heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot air heater such as an oil fan heater.
[0002]
[Prior art]
In a conventional hot air heater, for example, an oil fan heater, the combustion gas from the combustor and the indoor air from the blower fan are mixed in the air passage so that appropriate warm air is blown into the room. .
[0003]
In such a hot air heater, the amount of air gradually decreases due to dust clogging of the air intake filter or obstruction of the air intake due to obstacles, the internal temperature of the main body becomes excessively high, and other parts Failure may occur or high temperature hot air may be discharged from the air intake filter or the hot air outlet.
[0004]
In order to prevent this, in general, a temperature detection means is provided to detect the internal temperature of the main body and the temperature of the hot air, and the combustion of the combustor is stopped when the temperature exceeds a predetermined temperature set in advance. Like to do.
[0005]
[Problems to be solved by the invention]
However, as in the conventional case, the temperature detecting means is simply provided to detect the internal temperature of the main body and the temperature of the hot air, and the combustion of the combustor is stopped when the temperature exceeds a predetermined temperature set in advance. The blower fan is operating normally, but the intake air volume decreases due to dust and obstacles, and the internal temperature gradually rises. The temperature may rise and the body case may be abnormally overheated. In such a case, even if combustion is stopped at the predetermined temperature, the internal temperature of the main body rises excessively due to overshoot. Considering this, if the predetermined temperature at which combustion is stopped is lowered, inconvenience that the combustion is stopped due to slight dust clogging of the air intake filter or the like tends to occur.
[0006]
For the present invention to solve such inconvenience, without burning I by the reduction intake air amount due to clogging by minor dust clogging or obstruction of the inlet filter air intake is stopped, and the fan failure It is an object of the present invention to obtain a warm air heater that can immediately stop combustion and prevent an excessive increase due to overshoot of the internal temperature of the main body.
[0007]
[Means for Solving the Problems]
The hot air heater of the present invention includes a main body provided with a hot air outlet and an air intake, an air passage connecting the hot air outlet and the air intake of the main body, and sucks air from the air intake. A blower fan that blows air into the air passage, and a combustion cylinder that discharges combustion gas from the combustor into the air passage through the upper opening, and the upper end of the air intake is higher than the upper end of the hot air outlet In the provided hot air heater, overheating that stops the combustion of the combustor by detecting an abnormal overheat temperature on the ceiling wall of the air passage located on the hot air outlet side from above the opening of the combustion cylinder detecting the highest equivalent thermo and for high rather the overheat preventing than the room temperature or lower temperatures in the heating located on the inlet side air intake than the opening above the combustion cylinder with installing the prevention thermo Install a thermistor to stop the combustion of the combustor The thermistor installed to protrude its tip portion in said air passage, said combustion cylinder, the temperature air outlet side of the upper opening is closed by the cover plate, and the cover plate, the inlet side of the end intake the air A guide that raises the combustion gas released from the upper opening of the combustion cylinder toward the tip portion of the thermistor that protrudes without the air passage when the blower fan fails in the section and air is not sent from the blower fan It is set as the structure which has a part .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
Embodiment 1 of the hot air heater of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic cross-sectional view of a hot air heater showing Embodiment 1 of the present invention, and FIG. 2 is an external view as seen from the back. FIG. 3 is a schematic cross-sectional view showing the flow of air, combustion gas, and warm air in the normal use state in Embodiment 1 of the present invention, and FIG. 4 is the amount of air from the blower fan in Embodiment 1 of the present invention. FIG. 5 is a schematic cross-sectional view showing the flow of air, combustion gas, and warm air when decreasing, and FIG. 5 is a schematic cross-sectional view showing the flow of combustion gas when the blower fan fails in Embodiment 1 of the present invention.
[0012]
In the figure, 1 is a main body case constituting the main body of the hot air heater, 2 is a hot air outlet provided at the front of the main body case from the lower part, and 3 is an air inlet provided at the upper part of the rear surface of the main body case. 4 is a combustor that burns liquid fuel such as kerosene, and 5 is a combustion cylinder that is provided so as to cover the outer periphery of the combustor 4 and discharges combustion gas from the combustor 4 from an opening 6 formed in the upper part thereof. , 7 is a cover plate that covers the hot air outlet 2 side of the opening 6 of the combustion cylinder 5, and is provided with a guide portion 7a at its end for directing the outflow of combustion gas to the rear. Reference numeral 8 denotes a blower fan provided in the air intake 3 portion, and is attached to the rear surface of the main body case 1 via a protective guard 9 that also serves as an air intake filter. 10 is an air passage communicating between the warm air outlet 2 and the air intake 3; 11 is an overheat prevention thermostat as temperature detection means for preventing overheating installed on the outer surface of the ceiling wall 10a of the air passage 10; Is a thermistor as temperature detecting means that operates by detecting a temperature lower than the operating temperature of the overheat prevention thermo, and the thermistor 12 is located on the air intake 3 side above the opening 6 of the combustion cylinder 5. Furthermore, the tip part is installed in the air passage 10 so as to protrude. The overheat prevention thermo 11 is installed between the hot air outlet 2 from above the opening 6 of the combustion cylinder 5. Reference numeral 13 denotes a control board on which a control circuit for receiving the detection signals of the overheat prevention thermo 11 and the thermistor 12 and controlling the operation of the combustor 4 and the blower fan 8 is mounted.
[0013]
The opening 6 of the combustion cylinder 5 is located below the upper end 3 a of the air intake 3 on the rear surface of the main body case 1 and is located above the upper end 2 a of the hot air outlet 2. An air intake filter 9 is attached to the rear of the blower fan 8 in order to prevent dust and the like from entering the air passage 10.
[0014]
As the temperature detecting means for detecting the temperature of the air passage 10, two overheat prevention Thermo 11 and the thermistor 12 is provided, one overheat preventing Thermo 11 arbitrary position air passage 10, for example, above the combustion cylinder 5 is located outside the more hot air outlet 2 side air passage, the other thermistor 12 is backward, i.e. are placed in position on the inlet 3 side air intake than the opening 6 above the combustion cylinder 5.
[0015]
Next, the operation of the first embodiment configured as described above will be described.
The air passage 5 takes in indoor air from the air intake 3 on the rear surface of the main body case 1 by the blower fan 8 and mixes it with the combustion gas from the opening 6 of the combustion cylinder 5 to the room from the hot air outlet 2 on the front surface of the main body case 1. And blow out warm air.
[0016]
Next, the flow of intake air, combustion gas, and hot air in a normal use state will be described with reference to FIG. In the figure, 14 indicates the flow of intake air, 15 indicates the flow of combustion gas, and 16 indicates the flow of hot air.
A part of the intake air 14 taken in by the operation of the blower fan 8 is mixed with the combustion gas 14 discharged from the opening 6 of the combustion cylinder 5, and a part is warmed by the flame and the combustion gas 15 from the combustor 4. After taking heat from the combustion cylinder 5 and setting it to warm air 16 of appropriate temperature, the air is blown into the room from the warm air outlet 2. At this time, the overheat prevention thermo 11 detects the temperature of the warm air 16 at an appropriate temperature, while the thermistor 12 detects the temperature substantially equal to the temperature of the room air sent from the blower fan 8, The operation is continued as it is.
[0017]
Next, the flow of intake air, combustion gas, and hot air when the intake air volume is reduced will be described with reference to FIG.
When dust adheres to the protective guard / air intake filter 9 provided on the rear surface of the blower fan 8 or when a part of the protective guard / air intake filter 9 is blocked by an obstacle or the like, The amount of air sent to the airflow decreases, and the temperature of the air passage 10 increases. At that time, the overheat prevention thermo 11 reliably detects the temperature of the air passage 10 that has risen, and dust adhering to the protective guard / air intake filter 9 or obstruction of the air intake 3 due to obstacles is caused by other parts. When a predetermined temperature set to cause a failure or to discharge high-temperature hot air from the hot air outlet 2 is detected, the combustion of the combustor 4 is stopped because the hot air temperature is abnormal. At this time, since the thermistor 12 detects a temperature substantially equal to the indoor air temperature sent from the blower fan 8 until combustion is stopped, the thermistor 12 does not detect any abnormality.
[0018]
Next, the flow of the combustion gas when the blower fan fails and stops during operation or when the blower fan fails and does not start at the start of operation will be described with reference to FIG.
In this case, since air is not sent from the blower fan 8, the combustion gas 15 flows only by the draft force, the opening 6 of the combustion cylinder 5 is below the upper end 3 a of the air intake 3 of the blower fan 8, and the hot air outlet 2. Is located above the upper end 2a of the combustion gas, the combustion gas 15 exiting the upper opening 6 of the combustion cylinder 5 passes through the vicinity of the bell mouth upper tip 3a of the air intake 3 and serves as a protective guard and air intake for the blower fan 8. It flows toward the inlet filter 9. At this time, when the combustion gas 15 exits the opening 6 of the combustion cylinder 5, the combustion gas 15 rises toward the tip portion of the thermistor 12 protruding into the air passage 10 by the guide portion 7 a provided at the end portion of the lid plate 7. The thermistor 12 instantly detects the high temperature of the combustion gas and immediately stops the combustion of the combustor 4.
[0019]
As described above, the thermistor 12 constantly detects the temperature almost the same as the temperature of the room air unless the blower fan 8 has a failure. Only when the blower fan 8 fails, the thermistor 12 detects the high temperature of the combustion gas. Therefore, the thermistor 12 can instantly detect this high-temperature combustion gas temperature and immediately stop the combustion of the combustor 4.
[0020]
Further, the temperature at which the thermistor 12 can detect the abnormality of the blower fan 8 may be a temperature higher than the highest indoor temperature during heating, and may be set to a high temperature close to the combustion gas temperature, for example. It may be set to a temperature equivalent to the lower overheat prevention thermo 11 or may be set to a lower temperature.
[0021]
Therefore, according to the configuration of the first embodiment, the overheat prevention thermo 11 is used when the intake air amount is significantly reduced due to dust clogging of the air intake filter 9 or obstruction of the air intake 3 due to an obstacle as usual. Before a failure due to a temperature rise inside the main body or high-temperature hot air is discharged from the hot air outlet 2, the temperature of the air passage 10 is detected and a signal is output to the control board 13, and the combustor is set at a predetermined temperature set in advance . 4 of the combustion can Rukoto stopped. On the other hand, or failed blower fan 8 during operation, or if the blower fan 8 at the start of the operation If a defect is hot Ri by the draft force of the combustion gas is formed at the end portion of the cover plate 7 The guide portion 7a flows toward the thermistor 12, and the thermistor 12 can instantaneously and more reliably detect the abnormality of the blower fan 8 and stop the combustion of the combustor 4.
Therefore, the combustion is stopped by the excessive increase in the internal temperature of the main body due to overshoot as in the prior art, the reduction of the amount of intake air due to slight dust clogging of the air intake filter 9 or the blockage of the air intake 3 due to obstacles, etc. It is possible to prevent the inconvenience of being lost.
[0022]
【The invention's effect】
As described above, the present invention includes a main body provided with a hot air outlet and an air inlet, an air passage connecting the hot air outlet and the air inlet of the main body, and intake air from the air inlet. A blower fan that blows air into the air passage and a combustion cylinder that discharges combustion gas from the combustor into the air passage through the upper opening, and the upper end of the air intake port is provided above the upper end of the hot air outlet port. In the hot air heater that is used, overheating prevention that stops the combustion of the combustor by detecting an abnormal overheating temperature located on the ceiling wall of the air passage on the hot air outlet side from above the opening of the combustion cylinder than said opening above the combustion cylinder to detect the highest equivalent thermo and for high rather the overheat preventing than the room temperature or lower temperatures in the heating located on the inlet side air intake with installing use thermo Install a thermistor to stop the combustion of the combustor. The thermistor installed to protrude its tip portion in said air passage, said combustion cylinder, the temperature air outlet side of the upper opening is closed by the cover plate, and the cover plate, the inlet side of the end intake the air A guide that raises the combustion gas released from the upper opening of the combustion cylinder toward the tip of the thermistor that protrudes into the air passage when the blower fan fails in the section and air is not sent from the blower fan As a result of having the structure, there is no inconvenience that the combustion is stopped due to a decrease in intake air amount due to light dust clogging of the air intake filter or obstruction of the air intake due to obstacles as in the past , and In the event of a failure of the blower fan, the combustion of the combustor is immediately stopped to prevent an excessive increase in the internal temperature due to overshoot.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view showing Embodiment 1 of the present invention.
FIG. 2 is an external view of the hot air heater according to the first embodiment as viewed from the back side.
FIG. 3 is a schematic cross-sectional view showing a normal air flow in the first embodiment of the present invention.
FIG. 4 is a schematic cross-sectional view showing the air flow when the intake air amount is reduced in the first embodiment of the present invention.
FIG. 5 is a schematic cross-sectional view of the air flow when a blower fan fails in Embodiment 1 of the present invention.
[Explanation of symbols]
1 Body case, 2 Hot air outlet, 2a Upper end of hot air outlet, 3 Air intake, 3a Upper end of air intake, 4 Combustor, 5 Combustion cylinder, 6 Opening, 7 Cover plate, 7a Guide part, 8 Blow fan, 9 protection guard / air intake filter, 10 air paths, 11 overheat prevention thermo (temperature detection means), 12 thermistor (temperature detection means), 14 intake air, 15 combustion gas, 16 hot air.

Claims (1)

A main body provided with a hot air outlet and an air inlet, an air passage connecting the hot air outlet and the air inlet of the main body, and a blower fan that sucks air from the air inlet and blows it into the air passage And a combustion cylinder that discharges combustion gas from the combustor into the air passage from the upper opening, and the upper end of the air intake is provided above the upper end of the hot air outlet. An overheat prevention thermostat is installed on the ceiling wall of the air passage on the hot air outlet side above the opening of the combustion cylinder to stop the combustion of the combustor by detecting an abnormal overheat temperature. stopping the combustion of the combustor to detect the temperature lower than the high rather equal to the overheat preventing thermo or than the highest room temperature during heating is located on the inlet side air intake than the opening above the cylinder set up a service over thermistor, the thermistor is ahead The portion is placed to protrude on the air passage, said combustion cylinder, the temperature air outlet side of the upper opening is closed by the cover plate, and the cover plate, the blowing fan at an end of the air inlet side Having a guide portion that raises the combustion gas released from the upper opening of the combustion cylinder toward the tip portion of the thermistor that protrudes into the air passage when air fails to be sent from the blower fan. A warm air heater characterized by that.

Images