JP3346154B2 - Hot air heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to combustion control of a hot air heater used for heating by burning fuel and using the heat to blow out room air as warm air for heating.

[0002]

2. Description of the Related Art Conventionally, this type of hot air heater is shown in FIGS.
As shown in (5), fuel is supplied from the cartridge tank 45 to the tank 44, and the fuel in the tank 44 is supplied by the pump 46 to the vaporizing section 47 maintained at a predetermined temperature or higher during combustion. The fuel is supplied to the vaporization section 4 maintained at a high temperature.
The gas is vaporized in 7 and becomes a fuel gas. The fuel gas is ejected from a nozzle 48, supplied to a burner unit 49, and burned there. Further, in the vicinity of the burner section 49, a flame rod type combustion sensor 51 for applying a voltage between the frame electrode 50 and the burner section 49 inserted in the combustion flame and measuring the amount of flowing current to detect the combustion state. Is arranged. The generated high-temperature combustion exhaust gas is guided upward by a combustion tube 52 disposed so as to cover the periphery of the burner portion 49, and mixed with a room air flow from a blower 54 by a duct 53 covering the combustion tube 52. ,
It is discharged as warm air and used for heating.

A nozzle 48 for ejecting fuel vaporized gas from a vaporizing section 47 is opened and closed by a needle valve provided in a movable section of an electromagnetic solenoid 55. When combustion is stopped, the electromagnetic solenoid 55 is energized for a predetermined time, and the nozzle 48 is energized. The combustion is stopped by preventing the fuel gas from being ejected from the fuel cell.

Further, a control unit 56 applies an output corresponding to the combustion state to the combustion sensor 5 obtained by applying a voltage between the frame electrode 50 and the burner unit 49 and measuring the amount of current flowing.
1, and the combustion is controlled. If the combustion of the burner 49 causes an abnormality for some reason,
For example, when the amount of combustion air becomes extremely small, the current value decreases, and the control unit 56 abnormally operates when the current value is kept lower than a predetermined value for a predetermined time in order to prevent premature disconnection in a normal state. The control unit 56 determines that the pump 46
And the blower 54 are controlled in a predetermined sequence to stop the combustion.

[0005]

However, in such a conventional hot air heater, if the power supply to the equipment is stopped during the combustion when the outlet of the equipment is disconnected or the power supply to the equipment is stopped for some reason, the air supply to the blower 54 and the pump 46 is stopped. The energization is stopped and the combustion is interrupted. At this time, the vaporized gas of the fuel stored in the vaporizing section 47 kept at a high temperature is discharged from the nozzle 48 without being burned, and goes out of the device as white smoke with a strong odor to be used. There was a problem that caused discomfort and anxiety to the elderly.

[0006] This power outage is usually not likely to occur very often due to the power situation, and it is thought that there is a lot of short time even if it occurs, but it is usually possible that the user accidentally turns off the power of the equipment. It is assumed that it has been removed, and even if the power is immediately restored at that time, the combustion is stopped because the power is turned off once. Even if the user manages the above-mentioned white smoke of the vaporized gas or the like, the user does not stop, and the user is very dissatisfied.

[0007] When this power failure is repeated, the vaporized gas of the fuel ejected from the nozzle 48 adheres to the surroundings,
There is also a possibility that tarification occurs, the function of the attached portion is reduced, and a constant odor is generated.

Further, the interruption of the combustion causes the temperature near the burner 49 to rise, raising the temperature of the surrounding parts and the exterior of the upper part of the main body, causing burns and impairing the performance of the equipment. there were.

Furthermore, if the rotation of the blower 54 becomes weak or stops for some reason during combustion, the burner 49
There is a possibility that a part of the wind of the blower 49, which is supplied to the burner and used as the combustion air, is reduced to cause a problem in the combustion of the burner portion 54.

This is more likely to occur remarkably as the combustion is weak and the set rotation speed of the blower 54 is lower.
If the rotational speed of the blower 54 is low, the rotational force of the blower 54 is weak, and the load of the blower 54 becomes large due to defects such as scratches and rust of the shaft of the blower 54 itself and dust in the bearing portion. When the combustion amount is low and the combustion amount is small, the combustion is likely to be affected by a decrease in the rotation speed of the blower 54, and the combustion tends to be insufficient and the air becomes turbulent.

Here, if the combustion is disturbed, the characteristics of the combustion exhaust gas may be deteriorated, causing odor or generating carbon monoxide. Therefore, the control unit 56 detects the combustion state of the burner unit 49. When the output of the combustion sensor 51 decreases and is maintained at or below a predetermined level for a predetermined time, it is determined that the combustion of the burner unit 49 has caused an abnormality for some reason, and the combustion is stopped. There was a problem of cutting.

If the above-mentioned predetermined level is lowered in order to prevent premature cutting, or if the preserving time is extended and the direction is set to be late, there is a possibility that the rotation of the blower 54 will be stopped, and the burner section 49 will be stopped. The high-temperature exhaust gas burned in the above flows upward, abnormally increasing the temperature of the upper part of the main unit, burning parts such as the operation unit disposed on the upper part of the main unit, increasing the outer temperature of the upper part of the main unit case, There were also concerns such as fires.

Further, even if the number of revolutions of the blower 54 does not change, the airflow of the blower 54 discharged from the apparatus as warm air is lost to another wind from the front, for example, by a draft such as a window, so that the burner section. There is a problem that the combustion is disturbed in the same manner as described above even if the gas flows backward to the 49 side.

A first object of the present invention is to solve the above-mentioned problem, and to reduce the discharge of fuel vaporized gas from the vaporizing section at the time of recovery from power failure of an apparatus, thereby preventing discomfort to a user. In order to prevent air from flowing back to the burner due to drafts or to reduce or stop the rotation of the blower for some reason, stop the combustion by increasing the rotation speed of the blower so that the rotation of the blower does not weaken. The second object is to prevent premature disconnection of the burner and to enable safe use for a long period of time, and the third object is to prevent heat from remaining in the burner and equipment.

[0015]

In order to achieve the above object, a tank for storing fuel, a pump for sucking and discharging fuel from the tank, a vaporizing section for vaporizing fuel supplied by the pump, A nozzle for ejecting fuel vaporized gas from the vaporizing section, an electromagnetic solenoid for opening and closing the nozzle with a needle valve provided on its movable section, a burner section for burning fuel vaporized gas from the vaporizing section, and a burner for covering the burner section A combustion cylinder that guides the combustion exhaust gas generated in the section upward, a duct that covers the combustion cylinder and mixes the combustion exhaust gas with the indoor air flow from the blower to generate warm air, and a net that is disposed at the air intake of the blower. Fan guard having filter parts such as punching holes and lattice holes, room temperature detecting means for detecting ambient temperature as a representative value of room temperature, and power failure confirmation means for detecting power failure An operation unit for setting operating conditions such as a control temperature, and a control unit for controlling a pump, a blower, and the like in a predetermined sequence under the conditions set by the operation unit. When the temperature obtained by the room temperature detecting means is equal to or higher than the first predetermined temperature, the electromagnetic solenoid and the blower are operated for a predetermined time or until the temperature obtained by the room temperature detecting means becomes equal to or lower than the second predetermined temperature. Then, after closing the nozzle portion and cooling the device, the electromagnetic solenoid is operated to open the nozzle portion, and a power failure recovery control portion for stopping the blower is provided.

According to the above invention, the power failure recovery control section determines whether the temperature obtained by the room temperature detecting means at the time of recovery from the power failure is equal to or higher than the predetermined temperature, for a predetermined time or until the temperature obtained by the room temperature detecting means becomes lower than the predetermined temperature. Since the electromagnetic solenoid is operated to close the nozzle portion and the blower is operated to cool the device, the vaporized gas of the fuel in the vaporized portion that is hot is discharged. Can reduce user discomfort and anxiety, reduce heat build-up near the burner, increase the temperature of surrounding components and the exterior temperature of the top of the main unit, and reduce It is possible to prevent abnormalities such as burns to a person and impair the performance of the device.

[0017]

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a tank for storing fuel, a pump for sucking and discharging fuel from the tank, a vaporizer for vaporizing fuel supplied by the pump,
A nozzle for ejecting the fuel vaporized gas of the vaporizing section, an electromagnetic solenoid for opening and closing the nozzle with a needle valve provided on a movable section thereof, a burner section for burning the fuel vaporized gas from the vaporizing section, and the burner section. A combustion tube that guides high-temperature flue gas generated in the burner portion upward, a duct that covers the combustion tube and mixes the flue gas and indoor airflow from a blower to generate hot air, and an air intake of the blower Fan guard with filters such as nets, punching holes and grid holes, room temperature detection means for detecting ambient temperature as a representative value of room temperature, power failure confirmation means for detecting power failure, and operation such as control temperature An operation section for setting conditions; and a control section for controlling a pump, a blower, and the like in a predetermined sequence under the conditions set by the operation section, and When the temperature obtained by the room temperature detecting means is equal to or higher than the first predetermined temperature, it is determined that the temperature obtained by the room temperature detecting means is equal to or lower than the second predetermined temperature. A power failure recovery control unit is provided for activating the electromagnetic solenoid to close the nozzle portion and then opening the nozzle portion again.

When the temperature obtained by the room temperature detecting means at the time of recovery from the power failure is equal to or higher than a predetermined temperature, the power failure recovery control unit controls the electromagnetic solenoid until a predetermined time or until the temperature obtained by the room temperature detecting means becomes lower than the predetermined temperature. By operating the nozzle, the nozzle is closed, so it is possible to reduce the discharge of the vaporized gas of the fuel in the high temperature vaporizing section, and prevent the user from feeling uncomfortable or uneasy can do.

A tank for storing fuel, a pump for sucking and discharging fuel from the tank, a vaporizer for vaporizing the fuel supplied by the pump, a burner for burning fuel vaporized gas from the vaporizer, A combustion tube that covers the burner portion and guides the flue gas generated in the burner portion upward; a duct that covers the combustion tube and mixes the high-temperature flue gas with the room airflow from the blower to generate hot air; Fan guards with filters such as nets, punching holes, grid holes, etc., installed at the intake, room temperature detection means for detecting ambient temperature as a representative value of room temperature, power failure confirmation means for detecting power failure, control temperature, etc. An operation unit that sets the operating conditions of the, comprising a control unit that controls a pump, a blower, and the like in a predetermined sequence under the conditions set by the operation unit, When it is determined by the power failure confirmation means immediately after the recovery from the power failure, when the temperature obtained by the room temperature detection means is equal to or higher than the first predetermined temperature, the predetermined time or the temperature obtained by the room temperature detection means becomes equal to or lower than the second predetermined temperature. Up to this point, after the blower is operated to cool the device, a power failure recovery control unit for stopping the blower is provided.

When it is determined by the power failure confirmation means that it is immediately after recovery from the power failure, when the temperature obtained by the room temperature detection means is equal to or higher than the first predetermined temperature, a predetermined time or the temperature obtained by the room temperature detection means becomes the second predetermined temperature. Until the temperature becomes lower than or equal to the temperature, by operating the electromagnetic solenoid and the blower, closing the nozzle portion, and, after cooling the device, after opening the nozzle portion again, provided with a power failure return control unit to stop the blower. Things.

With the above-described configuration, the power failure recovery control unit performs the following operation when the temperature obtained by the room temperature detection means at the time of recovery from the power failure is higher than a predetermined temperature, for a predetermined time or until the temperature obtained by the room temperature detection means becomes lower than the predetermined temperature. Activate the electromagnetic solenoid, close the nozzle, and activate the blower,
Since the device is cooled, it is possible to reduce the discharge of the vaporized gas of the fuel in the vaporizing section, which is at a high temperature, and to prevent the user from feeling uncomfortable or uneasy. , Reduces the heat buildup near the burner,
It is possible to prevent abnormalities such as increasing the temperature of the surrounding parts and the exterior of the upper part of the main body, and impairing the performance of the device.

A tank for storing fuel, a pump for sucking and discharging fuel from the tank, a vaporizer for vaporizing fuel supplied by the pump, and a burner for burning fuel vaporized gas from the vaporizer. A combustion tube that covers the burner portion and guides the high-temperature combustion exhaust gas generated in the burner portion upward, a duct that covers the combustion tube and mixes the combustion exhaust gas with a room air flow from a blower to generate hot air; A fan guard having a filter portion such as a net, a punching hole, a lattice hole, etc., disposed at an air intake port, and room temperature detecting means for detecting an ambient temperature as a representative value of the room temperature,
An operation unit that sets operating conditions such as a control temperature, and a control unit that controls the pump, the blower, and the like in a predetermined sequence under the conditions set by the operation unit. When the obtained temperature is equal to or higher than the first predetermined temperature, the rotation speed of the blower is set to a predetermined rotation from the initial rotation speed for a predetermined time or until the temperature obtained by the room temperature detecting means becomes equal to or lower than the second predetermined temperature. When the temperature obtained by the room temperature detecting means is equal to or higher than a predetermined temperature,
After maintaining the rotation speed of the blower at a predetermined rotation speed higher than the initial rotation speed for a first predetermined time, control is performed so as to return to the initial rotation speed, and when the temperature obtained by the room temperature detecting means is equal to or higher than the predetermined temperature. After maintaining the rotation speed of the blower at a first predetermined rotation speed higher than the initial rotation speed for a predetermined time, the second rotation speed is higher than the initial rotation speed and lower than the first predetermined rotation speed by a second rotation speed. When the temperature obtained by the room temperature detecting means is equal to or higher than a predetermined temperature, and only when the operating condition of the device is a weak operation in which the combustion amount is low, the rotation speed of the blower is increased from the initial rotation speed by a predetermined rotation speed. This is provided with an increased number of blower control units.

With these configurations, the blower control unit determines that the rotation speed of the blower decreases when the rotation speed of the blower drops for some reason and the temperature obtained by the room temperature detecting means with the hot air of the combustion unit rises above a predetermined temperature. Is controlled to increase by a predetermined number of revolutions, for example, 50 times / minute, higher than the initial number of revolutions, so that the number of revolutions of the blower is increased, and the rotation of the fan is continued. Part of the wind from the blower, which assists the combustion of the burner, is supplied to the burner and used as combustion air so that it can be stably burned. In addition to preventing the premature stoppage of combustion stoppage due to a decrease in the rotation speed of the blower, it can also reduce the build-up of heat near the burner and inside the equipment. Can be prevented.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) First, the configuration of a hot-air heating apparatus using a combustion device of Embodiment 1 of the present invention will be described with reference to FIGS. 1, 2, 3, and 4. FIG. Reference numeral 1 denotes a main body case, on which a tank 2 for holding liquid fuel is provided on a lower side thereof, and a detachable cartridge tank 3 is provided above the tank 2. 4 is tank 2
The fuel is supplied from the upper end of the pump to the vaporizer 6 via the oil feed pipe 5. The vaporizing section 6 has a mixing tube 7 projecting at the center thereof and is formed in a donut shape so as to surround the mixing pipe 7, and a heater 8 and a vaporizing section temperature detecting means 9 are arranged on the peripheral wall.

Reference numeral 10 denotes a communication passage provided to the nozzle unit 11 on the side opposite to the mixing pipe 7 with respect to the inlet of the oil supply pipe 5 of the vaporization unit 6. A return pipe 12 and an electromagnetic solenoid 13 connected to the tank 2 are connected to the nozzle 11, and the electromagnetic solenoid 13 is connected to the nozzle 11.
A needle valve 14 for opening and closing the nozzle hole 11A is provided. Reference numeral 15 denotes a burner placed above the vaporizing section 6 so as to cover the outlet of the mixing tube 7.
A voltage is applied to an ignition means 17 such as a high-pressure discharge for starting combustion of a vaporized gas ejected from a flame hole 16 formed on a peripheral wall of the frame 5, a frame electrode 18 and a burner section 11 put in the combustion flame, and a current flowing therethrough. A flame rod type combustion sensor 19 for measuring the amount and detecting the combustion state is provided. It is provided.

Reference numeral 20 denotes a combustion tube for guiding the high-temperature combustion exhaust gas from the burner section 15 upward, and a blower 21 for taking in and sending out the indoor air flow is disposed behind the combustion tube. Reference numeral 22 denotes a fan guard that is disposed at the air intake of the blower 21 and has a filter portion such as a net, a punching hole, or a grid hole. The fan guard 22 near the upper portion of the fan guard 22 through which heat of the burner portion 15 flows when the blower 21 is stopped. Room temperature detecting means 23 is provided. Reference numeral 24 denotes a duct for mixing the combustion gas from the combustion cylinder 7 and the indoor air flow to generate hot air.

Reference numeral 25 denotes a pump 4, a heater 8, and a blower based on signals of operating conditions such as control temperature input from an operation unit 26 and signals of sensors such as room temperature detecting means 23 provided in the apparatus. 21 is a control unit that controls the operation of a device that starts or stops combustion by controlling a device such as 21 in a predetermined sequence.

Further, the control unit 25 includes a power failure confirmation means 27 for detecting that a power failure has occurred, and when the power failure confirmation means 27 determines that the power has just returned from the power failure, the temperature obtained by the room temperature detection means 23 exceeds a predetermined temperature. The electromagnetic solenoid 13 and the blower 21 are operated for a predetermined time or until the temperature obtained by the room temperature detecting means 23 becomes equal to or lower than the predetermined temperature. , A blower control unit 29 for controlling the drive to increase the rotation speed of the blower 21 when the temperature obtained by the room temperature detecting means 23 is equal to or higher than a predetermined temperature is provided.

In the above configuration, the vaporizing section 6 is heated to a predetermined temperature by the heater 8 and vaporizes oil entering from the inlet of the oil feed pipe 5 in the process of reaching the communication passage 10. The vaporized gas flows downward through the communication passage 10 below the vaporizing section 6 and reaches the nozzle section 11, and activates the electromagnetic solenoid 13 to open the needle valve 14 to eject the vaporized gas from the nozzle section 11. Then, the vaporized gas is supplied into the burner section 15 through the mixing pipe 7 while sucking and mixing the surrounding air, and is ejected from the flame hole 16.

Here, when the ignition means 17 is constructed, a uniform flame is formed in a large number of flame holes 16 to start combustion, and even when the ignition means 17 is stopped, the fuel is supplied to the vaporizing section 6 by the pump 4 as it is. If the supply is continued, the combustion will continue.

The generated high temperature combustion exhaust gas is supplied to the burner section 15.
The air is guided upward by a combustion tube 20 disposed so as to cover the periphery of the combustion tube, mixed with a room air flow from a blower 21 by a duct 24 covering the combustion tube 20, discharged as warm air, and used for heating. You. In addition, the indoor air flow introduced from the blower 21 flows into the device via the fan guard 22 and is attached to the fan guard 22 to detect the room temperature 23
Measures the temperature of this indoor airflow and outputs it as room temperature. If the rotation of the blower 21 becomes weak or stops for some reason, the room temperature detecting means 2
The temperature near 3 is high.

Then, the oil hot air heater is controlled by the control unit 25.
When the fuel supply amount is adjusted by changing the driving frequency or applied voltage of the pump 4 based on the operating condition signal or the like input from the operation unit 26, the primary air amount also increases and decreases, and the fuel-to-air ratio is constant. It is possible to change the amount of combustion while maintaining it.

When a command to stop the combustion is input from the operating section 26, the pump 4 is stopped and the electromagnetic solenoid 1 is stopped for a predetermined time.
3 is operated, the nozzle valve hole 11A of the nozzle unit 11 is closed by the needle valve 14, and the fuel in the vaporization unit 6 returns to the return pipe 1.
After that, the electromagnetic solenoid 13 operates the needle valve 14 so as to open the nozzle hole 11A of the nozzle unit 11 to stop the combustion in the combustion unit.

Further, the control unit 25 applies an output corresponding to the combustion state to the flame electrode 18 and the burner unit 15 by applying a voltage to the combustion sensor 19 obtained by measuring the amount of current flowing.
When the combustion of the burner unit 15 causes an abnormality for some reason, for example, when the combustion air becomes extremely small, the current value decreases, and the control unit performs the combustion control. In order to prevent premature disconnection in the normal state, if the current value is lower than the predetermined value and held for a predetermined time, it is determined that an abnormality has occurred, and the control unit 25 determines that the pump 4 and the blower 21 are in a predetermined sequence. To stop the combustion.

Here, the power failure recovery control unit 28 and the blow control unit 29 are configured as shown in FIGS. 5, 6, 7 and 8, and the configuration and operation will be described below.

First, the invention shown in FIG. 5 will be described. If there is a power failure for some reason during combustion, at the time of the power failure recovery at 30, when the power failure confirmation means 27 determines that it is immediately after the power failure recovery, the power failure recovery control unit Reference numeral 28 denotes a signal from the room temperature detecting means 23
Check at 1, and when the room temperature detecting means 23 is higher than a predetermined temperature, the electromagnetic solenoid 13 and the blower 21 are set to 32 for a predetermined time.
After closing the nozzle hole 11A of the nozzle portion 11 and cooling the device, the electromagnetic solenoid 1
3 is operated to open the nozzle portion hole 11A of the nozzle portion 11, and the blower 21 is stopped at 33.

Therefore, when there is a power failure for some reason during combustion, the vaporized fuel gas stored in the vaporizing section 6 kept at a high temperature is discharged from the nozzle hole 11A of the nozzle section 11 without burning. There is a concern that the user may feel uncomfortable or uneasy by emitting white smoke with a strong odor to the outside of the device, which may cause the user to feel uncomfortable or uneasy. The electromagnetic solenoid 13 is operated for a predetermined period of time until the temperature of the nozzle drops to some extent and the fuel in the vaporization section 6 is returned via the return pipe 12, and the nozzle hole 11 A of the nozzle section 11 is closed by the needle valve 14. Therefore, after the return, the vaporized gas is not discharged from the nozzle hole 11A of the nozzle 11 and the above-mentioned discomfort and anxiety of the user can be reduced, and the shorter the time of the power failure, the lower the reduction. Uninaru.

When the power failure is repeated, the vaporized gas of the fuel ejected from the nozzle hole 11A of the nozzle portion 11 adheres to the surroundings and turns into tar, deteriorating the function of the adhered portion, and reducing the steady state. There was also a risk of generating a bad smell, but this is also reduced.

Further, the blower 21 is also operated for a predetermined time while the temperature of the vaporizing section 6 is high at the time of recovery from the power failure, so that the build-up of the temperature near the burner section 15 due to the interruption of combustion is eliminated.
Since the temperature of the surrounding parts and the exterior temperature of the upper part of the main body case 1 are increased, the user is not worried about burns or impairing the performance of the device, and the temperature of the vaporizing section 6 is quickly lowered. In addition, the operation time of the electromagnetic solenoid 13 can be shortened.

(Embodiment 2) Next, the embodiment shown in FIG. 6 will be described. When the temperature obtained from the room temperature detecting means 23 at the time of combustion is equal to or higher than a predetermined temperature,
The number of rotations of the blower 15 is increased by a predetermined number of times from the initial number of rotations at 5 and further, when the amount of current obtained by the combustion sensor 13 is held at that state for a predetermined time at 36 at that state. A signal is sent to the control unit 25 to stop the combustion, and the control unit 25 controls the pump 4 and the blower 15 in a predetermined sequence to stop the combustion, and if not, continues the combustion. .

With the configuration described above, the air blowing control unit 29
When the rotation speed of the blower 21 decreases for some reason and the temperature near the room temperature detecting means 23 increases due to the hot air in the burner section 15 and the temperature obtained from the room temperature detecting means 23 becomes a predetermined temperature, for example, 35 ° C. or more, the blower The rotation speed of the motor 21 is controlled to increase by a predetermined rotation speed, for example, 50 rotations / minute from an initial rotation speed, for example, 500 rotations / minute, and the rotation force increases by, for example, about 10% by the increased rotation speed. Although the rotation speed of the fan 21 increases, the rotation of the blower 21 is continued.

The output of the combustion sensor 19 is
If the rotation is not restored even if the rotation speed of 1 is increased and is kept below a predetermined value for a predetermined time, the combustion can be stopped not because of the abnormal combustion due to the reduction in the rotation speed of the blower 21 but because there are other factors, so that the safety is reduced. Can be secured.

A part of the wind of the blower 21, which assists the combustion of the burner section 15, is supplied to the burner section 15 in a large amount and is used as combustion air so that it can be stably burned. It is possible to prevent the air from flowing back to 15 or to prevent the combustion from being stopped prematurely due to a decrease in the rotation speed of the blower 21, thereby further ensuring safety.

(Embodiment 3) Next, an embodiment shown in FIG. 7 will be described. When the temperature obtained from the room temperature detecting means 37 during combustion is equal to or higher than a predetermined temperature,
After the rotation speed of the blower 21 is maintained at a first predetermined rotation speed higher than the initial rotation speed for a first predetermined time, the blower 2
The number of revolutions is returned to the initial number of revolutions, and if the current amount obtained by the combustion sensor 19 in this state is kept below a predetermined value for a second predetermined time, the combustion is stopped. A signal is sent to the control unit 25, and the control unit 25 controls the pump 4 and the blower 21 in a predetermined sequence to stop the combustion, or otherwise continues the combustion.

With the configuration described above, the air blowing control unit 29
When the rotation speed of the blower 21 decreases for some reason and the temperature near the room temperature detecting means 23 increases due to the hot air in the burner section 15 and the temperature obtained from the room temperature detecting means 23 becomes a predetermined temperature, for example, 35 ° C. or more, the blower Since the rotation speed of the blower 21 is maintained at the predetermined rotation speed higher than the initial rotation speed, for example, 500 rotations / minute, for example, the maximum rotation speed of 1000 rotations / minute for the first predetermined time, for example, 3 seconds, the rotation force of the blower 21 increases to the maximum during that time. Then, the rotation of the blower 21 is restored. Thereafter, the rotation speed is controlled to return to the initial rotation speed, for example, 500 rotations / minute. When the rotation speed of the blower 21 decreases, the rotation speed of the blower 21 is temporarily increased to a higher value, and when the rotation is restored, the rotation speed is returned to the original rotation speed. When the rotation speed of the blower 21 decreases again, the above control is repeated, and the rotation of the blower 21 is continued.

The output of the combustion sensor 19 is
If the second predetermined time is maintained without returning to the predetermined value without increasing even if the rotation speed of 1 is increased, the combustion can be stopped not because of the abnormal combustion due to the reduction in the rotation speed of the blower 21 but because there is another factor. Safety can be ensured.

A part of the wind of the blower 21 which assists the combustion of the burner section 15 becomes temporarily large, but a minimum amount is supplied to the burner section 15 and used as combustion air to stably burn. It is possible to prevent air from flowing back to the burner unit 15 due to drafts or the like as in the case described above, and to prevent premature stop of combustion stoppage due to a decrease in the number of revolutions of the blower 21, thereby further ensuring safety. .

Here, in the case where the rotation of the blower 21 is reduced due to a defect such as a flaw of the shaft of the blower 21 itself, rust or a bite of the bearing portion, the rotation of the blower 21 is usually increased to recover the blower 21. The rotation speed of the blower 21 does not decrease even if the causes such as the scratches and rust of the shaft of the shaft 21 itself and the bite of the bearing portion are removed and the rotation speed is returned to the original rotation speed. According to experiments, it has been confirmed that once the cause of the rotation inhibition is removed, the phenomenon that the rotation speed decreases will not be reproduced, and when the rotation speed of the blower 21 decreases, the rotation speed is temporarily reduced. It is assumed that the rotation speed of the blower 21 is increased to a higher value, the rotation speed is returned to the original rotation speed, and the above-mentioned control is repeated when the rotation speed of the blower 21 decreases again. The rotation will continue.

(Embodiment 4) Next, the invention shown in FIG. 8 will be described. When the temperature obtained by the room temperature detecting means 23 at the combustion time is equal to or higher than the predetermined temperature at the time of combustion, the blower control unit 29 sets the rotation speed of the blower 21 to the first predetermined rotation speed higher than the initial rotation speed at 41. After the predetermined time is held, the second predetermined number of revolutions is increased from the initial number of revolutions at 42 so as to be higher than the initial number of revolutions and lower than the first predetermined number of revolutions. When the current amount obtained by the combustion sensor 19 becomes lower than a predetermined value and the second predetermined time is maintained, a signal is sent to the control unit 25 to stop the combustion, and the control unit 25
Controls the pump 4 and the blower 21 in a predetermined sequence to stop the combustion, and otherwise, continues the combustion.

With the configuration described above, the air blowing control unit 29
When the rotation speed of the blower 21 decreases for some reason and the temperature near the room temperature detecting means 23 increases due to the hot air in the burner section 15 and the temperature obtained from the room temperature detecting means 23 becomes a predetermined temperature, for example, 35 ° C. or more, the blower In order to maintain the rotation speed of the blower 21 at a first predetermined rotation speed higher than an initial rotation speed, for example, 500 rotations / minute, for example, at a maximum rotation speed of 1000 rotations / minute for a first predetermined time, for example, 3 seconds, the rotation force of the blower 21 during that time Rises to the maximum, and the rotation of the blower 21 recovers. afterwards,
From the initial rotation speed, for example, 500 rotations / minute to a second predetermined rotation speed, for example, 5 higher than 500 rotations / minute to be lower than the first predetermined rotation speed, for example, 1000 rotations / minute.
Since control is performed so as to increase the number of rotations by 0 / min, the rotation speed of the blower 21 is increased, and the rotation of the blower 21 is continued.

The output of the combustion sensor 19 is
If the rotation is not restored even if the rotation speed of 1 is increased and is kept below a predetermined value for a predetermined time, the combustion can be stopped not because of the abnormal combustion due to the reduction in the rotation speed of the blower 21 but because there are other factors, so that the safety is reduced. Can be secured.

A part of the wind of the blower 21 which assists the combustion of the burner section 15 is supplied to the burner section 15 in a large amount and is used as combustion air so that the combustion can be stably performed. It is possible to prevent the air from flowing back to 15 or to prevent the combustion from being stopped prematurely due to a decrease in the rotation speed of the blower 21, thereby further ensuring safety.

Here, after the rotational force of the blower 21 is increased to the maximum and the rotation of the blower 21 is surely recovered, the rotational speed is slightly higher than the initial rotational speed, for example, 500 times / minute, for example, 550 times / minute. Since the rotation speed is increased by about 10%, for example, 50 rotations / minute, for example, by the increased rotation number, the rotation number of the blower 21 is increased, but the rotation of the blower 21 is surely continued. become.

In the configuration of FIG. 5 of the above embodiment, the operation of the electromagnetic solenoid 13 and the operation of the blower 21 are performed for a predetermined time at the time of restoration from power failure. This is because the operation of the electromagnetic solenoid 13 and the operation of the blower 21 are performed. The configuration in which the room temperature detecting means 23 performs the operation until the temperature becomes equal to or lower than the predetermined temperature may be employed, and the configuration in which the operation of the electromagnetic solenoid 13 and the blower 21 are simultaneously performed has been described. May be set to a time period. Further, the configuration in which both the electromagnetic solenoid 13 and the blower 21 are operated has been described, but this may be performed by operating only the electromagnetic solenoid 13 or the blower 21 individually.

6 and 8 in the above embodiment, when the temperature obtained by the room temperature detecting means 23 during combustion is equal to or higher than a predetermined temperature, the rotation speed of the normal blower 21 is increased to the predetermined rotation speed. Although it is designed to increase only once, this may be repeated, and the configurations of FIGS. 6, 7 and 8 are designed to increase the rotation speed of the blower 21 regardless of the combustion conditions. However, this is because the rotation speed of the blower 21 is low,
As long as the combustion is limited to weak combustion that is easily reduced by defects such as scratches and rust on the shaft of the blower 21 itself and dust in the bearing, effective and such limiting conditions may be used.

Further, in the configuration of FIG. 5, FIG. 6, FIG.
The configurations of FIG. 8 may be combined, and the configuration of each unit may be any configuration as long as the object of the present invention is achieved.

[0057]

As described above, the power failure recovery control unit according to the present invention is designed so that when the temperature obtained by the room temperature detection means at the time of power recovery is higher than the predetermined temperature, the temperature obtained by the predetermined time or the temperature obtained by the room temperature detection means is restored. Until the temperature becomes lower than a predetermined temperature, the electromagnetic solenoid is operated to close the nozzle portion, so that it is possible to reduce the discharge of the vaporized gas of the fuel in the vaporized portion which is at a high temperature, and Discomfort and anxiety of the person can be prevented.

Also, the blower control unit increases the number of rotations of the blower by a predetermined number of times from the initial number of rotations to prevent air from flowing back to the burner due to drafts or the like, or to reduce or stop the rotation of the blower. , So that the rotation of the blower is not weakened to prevent premature stoppage of the combustion stop, thereby enabling safe use for a long period of time.

Further, since the power failure recovery control section and the blower control section are configured to cool the device by a blower, the heat buildup near the burner section can be reduced, and the surrounding parts and the outer temperature of the upper part of the main body can be reduced. Abnormalities such as raising the height of the device, causing a burn to the user, and impairing the performance of the device.

[Brief description of the drawings]

FIG. 1 is a control block diagram according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a combustion hot air heater of the same hot air heater.

FIG. 3 is a sectional view of a main part of the hot air heater.

FIG. 4 is a detailed view of a main part of the hot air heater.

FIG. 5 is a flowchart of the hot air heater.

FIG. 6 is a flowchart of a hot air heater according to a second embodiment of the present invention.

FIG. 7 is a flowchart of a hot air heater according to a third embodiment of the present invention.

FIG. 8 is a flowchart of a hot air heater according to a fourth embodiment of the present invention.

FIG. 9 is a control block diagram of a conventional hot air heater.

FIG. 10 is a sectional view of a conventional hot air heater.

[Explanation of symbols]

 2 Tank 4 Pump 6 Vaporizer 11 Nozzle 13 Electromagnetic solenoid 14 Needle valve 15 Burner 21 Blower 22 Fan guard 23 Room temperature detecting means 25 Control unit 27 Power failure confirmation means 28 Power failure recovery control unit 29 Ventilation control unit

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazutada Momota 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-9-137943 (JP, A) JP-A-7 −4652 (JP, A) JP-A-2-213614 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23N 5/24 110

Claims (7)

(57) [Claims] 1. A tank for storing fuel, a pump for sucking and discharging fuel from the tank, a vaporizer for vaporizing fuel supplied by the pump, and a nozzle for ejecting fuel vaporized gas from the vaporizer. An electromagnetic solenoid that opens and closes the nozzle with a needle valve provided in its movable portion, a burner portion that burns fuel vaporized gas from the vaporizing portion, and a high-temperature combustion exhaust gas that covers the burner portion and is generated by the burner portion. And a duct that covers the combustion cylinder and mixes the combustion exhaust gas with the indoor air flow from the blower to generate hot air, and is disposed at the air intake of the blower and has a net, a punching hole, a grid hole, and the like. Fan guard having a filter unit, room temperature detecting means for detecting ambient temperature as a representative value of room temperature, power outage confirming means for detecting power outage, and operating conditions such as control temperature An operation unit to be set, and a control unit that controls a pump, a blower, and the like in a predetermined sequence under the conditions set by the operation unit. When the obtained temperature is equal to or higher than the first predetermined temperature, the electromagnetic solenoid is operated to close the nozzle portion for a predetermined time or until the temperature obtained by the room temperature detecting means becomes equal to or lower than the second predetermined temperature. After that, a hot air heater provided with a power failure recovery control unit that opens the nozzle unit again. 2. A tank for storing fuel, a pump for sucking and discharging fuel from the tank, a vaporizer for vaporizing fuel supplied by the pump, and a burner for burning fuel vaporized gas from the vaporizer. A combustion tube that covers the burner portion and guides the flue gas generated in the burner portion upward, a duct that covers the combustion tube and mixes the high-temperature flue gas and the indoor air flow from the blower to generate hot air, and a duct for the blower. Fan guard that is installed at the air intake and has a filter such as a net, punching hole, grid hole, etc., room temperature detecting means for detecting ambient temperature as a representative value of room temperature, power failure confirming means for detecting power failure, and control temperature An operation unit that sets operating conditions such as, and a control unit that controls a pump, a blower, and the like in a predetermined sequence under the conditions set by the operation unit, When it is determined by the power checking means that the power is restored immediately after the power failure, when the temperature obtained by the room temperature detecting means is equal to or higher than the first predetermined temperature, for a predetermined time or until the temperature obtained by the room temperature detecting means becomes equal to or lower than the second predetermined temperature. 2. The hot air heater according to claim 1, further comprising a power failure recovery control unit that stops the blower after the blower is operated to cool the device. 3. When the power outage confirming means determines that it is immediately after a power outage, when the temperature obtained by the room temperature detecting means is equal to or higher than a first predetermined temperature, a predetermined time or the temperature obtained by the room temperature detecting means is changed to a second temperature. Activate the electromagnetic solenoid and blower until the temperature drops below the predetermined temperature, close the nozzle, and
The hot-air heater according to claim 1, further comprising a power failure recovery control unit that opens the nozzle unit again after cooling the device and stops the blower. 4. A tank for storing fuel, a pump for sucking and discharging fuel from the tank, a vaporizer for vaporizing fuel supplied by the pump, and a burner for burning fuel vaporized gas from the vaporizer. And a combustion tube that covers the burner portion and guides the high-temperature combustion exhaust gas generated in the burner portion upward, a duct that covers the combustion tube and mixes the combustion exhaust gas with the indoor air flow from the blower to generate hot air, Fan guards with filters such as nets, punching holes, and grid holes installed at the air intake of the blower, room temperature detection means for detecting the ambient temperature as a representative value of room temperature, and operating conditions such as control temperature are set. An operation unit, and a control unit that controls the pump, the blower, and the like in a predetermined sequence under conditions set by the operation unit, and detects the room temperature during combustion. When the temperature obtained from the stage is equal to or higher than the first predetermined temperature, the rotation speed of the blower is set to be lower than the initial rotation speed for a predetermined time or until the temperature obtained by the room temperature detecting means becomes equal to or lower than the second predetermined temperature. A warm air heater provided with a blower control unit for increasing a predetermined number of revolutions. 5. When the temperature obtained by the room temperature detecting means is equal to or higher than a predetermined temperature, the rotation speed of the blower is maintained at a predetermined rotation speed higher than the initial rotation speed for a first predetermined time and then returned to the initial rotation speed. 4. The hot air heater according to claim 3, further comprising a blower control unit for performing the control. 6. When the temperature obtained by the room temperature detecting means is equal to or higher than a predetermined temperature, the rotation speed of the blower is maintained at a first predetermined rotation speed higher than the initial rotation speed for a predetermined time, and then the fan rotation speed becomes higher than the initial rotation speed. 4. The hot air heater according to claim 3, further comprising a blower control unit configured to increase the second predetermined rotation speed from the initial rotation speed so as to be lower than the first predetermined rotation speed. 7. The rotation speed of the blower is increased from the initial rotation speed by a predetermined speed only when the operation condition of the device is a weak operation in which the combustion amount is low and the temperature obtained by the room temperature detecting means is higher than a predetermined temperature. The hot air heater according to any one of claims 4, 5, and 6, further comprising a blower control unit.