JP3478190B2 - Control device for 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 a controller for hot air heaters such as oil fan heaters and gas fan heaters.

[0002]

2. Description of the Related Art FIG. 7 is a patent application No. 11 filed by the present applicant.
FIG. 8 is a rear perspective view of a conventional hot air heater described in No. 167668, and FIG. 8 is a cross-sectional view of a convection fan mounting portion in the hot air heater. In the figure, 1 is a main body of a warm air heater, 2 is a blower for convection that discharges high temperature gas generated by combustion in a burner (not shown) provided inside the main body 1 as warm air, and the back of the main body 1 It is provided so as to correspond to the air intake port 1a formed on the. Reference numeral 3 is a fan guard for preventing dust and foreign matter from entering the inside of the main body 1 through the air intake port 1a, and has a large number of small holes 3a. The convection blower 2 is composed of a fan motor 4 and a convection fan 5. The fan motor 4 is attached to the fan guard 3 with a screw or the like, and the convection fan 5 is attached to a rotating shaft 4a of the fan motor 4 by a nut. It is installed by etc.

Reference numeral 6 denotes a hinge device fixed to the peripheral edge of the air intake 1a on the rear surface of the main body 1 by a screw or the like, and one side of the fan guard 3 is pivotally attached to the rear surface of the main body 1 and is openably and closably attached. Reference numeral 7 denotes two thumbscrews for fixing one side of the fan guard 3 on the side opposite to the side pivotally attached to the hinge device 6 to the screw hole 1b provided on the back surface of the main body 1.
The user can pinch it by hand and squeeze it or remove it. Reference numeral 8 denotes a switch provided in the main body 1 for detecting the open / closed state of the fan guard 3, and various types such as mechanical type, optical type and magnetic type are used.

Next, the operation will be described. First, when combustion is started, a flame is formed in the burner (not shown),
This flame produces hot gas. This high-temperature gas is pushed out to the front by the convection blower 2 together with the air sucked from the air intake 1a, and a hot air outlet (not shown).
More released and used for indoor heating.

As described above, this type of hot-air heater has a structure that takes in indoor air during combustion and discharges warm air. Therefore, since dust in the air is also sucked in, the opening of the fan guard 3 is opened. The portion is formed as a small hole 3a so that dust does not enter the inside as much as possible. However, when the usage time is accumulated, the dust passing through the small holes 3a of the fan guard 3 gradually adheres to the end portion and the surface of the convection fan 5, so that the internal temperature of the main body 1 rises due to the decrease in the blown air volume. In addition, various problems such as bad odor occur, and in order to eliminate these problems, it is necessary for the user to regularly clean the fan guard 3 and the convection fan 5.

When cleaning is required, the thumbscrew 7 is loosened with a finger and removed, and the fan guard 3 is rotated (opened) to the state shown in FIG. 9 about one side pivotally attached by the hinge device 6.
If so, the convection fan 5 can be easily taken out, and the cleaning operation can be performed extremely easily. If the fan guard 3 is opened during combustion, a signal from the switch 8 serving as the opening / closing detection means immediately stops combustion in the burner (not shown), and as shown in FIG. Further, the power supply to the fan motor 4 is stopped.

By the way, it has been considered that this type of hot air heater reduces the odor emitted during fire extinguishing.
FIG. 11 is a configuration diagram showing a liquid fuel combustion apparatus disclosed in, for example, Japanese Patent Laid-Open No. 7-293864. In the figure, 9 is a burner, 10 is a fuel supply means for supplying fuel to this burner 9, one end of this fuel supply means 10 is located in a fuel tank 11, and the other end is connected to a fuel supply pipe 12. There is. Further, 13 is an air supply pipe connected to the nozzle 14 to supply combustion air, and 15 is a blower for combustion.
Reference numeral 16 is a control means for controlling the fuel supply means 10 and the combustion blower 15.

Next, the operation will be described. The blower 15 for combustion rotates, and the air supply pipe 13,
It is sent to the nozzle 14 and supplied to the burner 9. After starting the ignition device (not shown), the fuel supply means 10 starts supplying fuel, and the amount of primary air ratio (combustion air / fuel ratio) from the fuel supply pipe 12 becomes about 0.8. Is supplied to the burner 9 to form a flame. The high temperature gas generated by this combustion is discharged as warm air by the convection blower 2 and is used for indoor heating.

When the user turns off the operation switch (not shown) to extinguish the fire when the fire is extinguished, the control circuit 1
At 6, the voltage application to the fuel supply means 10 is stopped. At this time, the decrease of the fuel becomes zero in the time of T0 to T1 as shown by the solid line in FIG. On the other hand, regarding the combustion air, for example, a half-wave shown in FIG. 13 is applied to the combustion blower 15 to apply braking to reduce the air flow rate. As a result, the flow rate of the combustion air becomes substantially equal to the fuel reduction rate as shown by the broken line in FIG. 12 (T1≈T2), and the flame can be extinguished while the ratio of the combustion air and the fuel (primary air ratio) remains constant. So Figure 1
It becomes only the portion shown by the diagonal line 2 and it becomes possible to reduce the amount of unburned residue that causes odor.

[0010]

However, in the above-mentioned conventional configuration, when the user opens the fan guard 3 during combustion, the combustion in the burner is stopped and the power supply to the fan motor 4 is stopped. The convection fan 5 is rotating by inertia, and it takes time to stop. In particular, the longer the convection fan 5 is operating, the longer the time. That is, in the unlikely event that the convection fan 5 is inertially rotating, if the user puts his / her hand out for cleaning, there is a safety problem such as injury to the rotating convection fan 5.

The present invention solves the above-mentioned problems, and even if the user opens the fan guard during combustion, the rotation of the convection fan can be immediately stopped to prevent injury. It is intended to provide a safe hot air heater control device.

[0012]

A control device for a hot air heater according to the present invention comprises a burner, a fuel supply means for supplying fuel to the burner, and a combustion blower for supplying combustion air to the burner. A convection blower that releases hot gas generated as a result of combustion in the burner as warm air, a fan guard that is provided so as to cover the convection blower, and is pivotally attached by a hinge device or the like, and a fan guard of this fan guard. When the open / closed state detecting means for detecting the open / closed state and the open state of the fan guard are detected by the open / closed state detecting means during combustion, the fuel supply means and the blower for combustion are de-energized to perform the fire extinguishing operation and the convection. The blower is provided with control means for energizing a half-wave to apply braking and stop rotation.

Further, the control device for the hot air heater according to the present invention comprises a burner, a fuel supply means for supplying fuel to the burner, a combustion blower for supplying combustion air to the burner, and the burner. A convection blower that releases hot gas generated by combustion as hot air, a fan guard that is installed to cover the convection blower and is pivotally attached by a hinge device, and the open / closed state of the fan guard is detected. When the open state of the fan guard is detected by the open / close detection means and the open / close detection means during combustion, the fuel supply means is stopped and at the same time the combustion blower is energized with a half wave to extinguish the fuel to reduce the fuel consumption. At the same time, braking is applied to the combustion blower to reduce the amount of air so that the reduction ratios of fuel and combustion air are almost equal, and the half-wave and the half-wave of opposite phase energized to the combustion blower are used. Rotating added braking by energizing the convection blower is obtained and a control means for stopping.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. First Embodiment FIG. 1 is a block diagram of a controller for a hot air heater showing a first embodiment of the present invention. Since the basic configuration of the warm air heater according to the present invention is the same as that shown in FIGS. 7, 8 and 11, the same or corresponding parts are designated by the same reference numerals and the description thereof will be omitted. In FIG. 1, 17 is an igniter for igniting the fuel and combustion air supplied to the burner 9 by the fuel supply means 10 and the blower 15 for combustion, and 18 is a high-temperature gas generated by combustion in the burner 9 It is a hot air outlet that is discharged as.

FIG. 2 is a flowchart showing the operation of the controller for the hot air heater according to the first embodiment of the present invention. In the figure, step 20 is a step of detecting the opening / closing of the fan guard 3, and since the fan guard 3 is normally closed, the routine proceeds to step 21. Here, when the user turns on the operation switch (not shown) arranged on the operation unit (not shown) provided in the main body 1 (step 21), the control means 16 receives this ON signal. Starts the rotation speed control of the combustion blower 15 (step 22) to supply the combustion air to the burner 9 and at the same time, the fuel supply means 1
0 is operated (step 23) to supply the fuel to the burner 9, the igniter 17 ignites, and the burner 9 burns. At this time, the ratio of the combustion air to the fuel (primary air ratio) is controlled to be substantially constant. When the combustion is started, the fan motor 4 is energized and the rotation speed control of the convection blower 2 is started (step 24). Then, step 2
Combustion is performed by repeating the operation of 0 to 24. Generally, when the combustion amount in the burner 9 is large, the rotation speed of the convection blower 2 is high, and conversely, when the combustion amount is small, the rotation speed is low, and the rotation speed is controlled according to the combustion amount. ing. As a result, the high-temperature gas generated by the combustion in the burner 9 is rotated by the convection blower 2 to rotate the air intake 1a.
It is pushed out to the front together with the more sucked air, discharged from the hot air outlet 18, and used for heating the room.

On the other hand, the user operates the operation switch (not shown).
Is turned OFF (step 21), the control means 16 receives the OFF signal and stops the combustion in the burner 9,
Extinguish fire. At this time, in order to extinguish the flame while keeping the ratio of the combustion air to the fuel (primary air ratio) constant and reduce the amount of unburned residue that causes odor, a half-wave is energized to the combustion blower 15 (step 25) for braking. The air flow rate is drastically reduced by adding the above, and at the same time, the voltage application to the fuel supply means 10 is stopped (step 26), so that the odor during fire extinguishing can be suppressed as shown in FIG. For a certain period of time after extinguishing the fire, the control means 16 rotates the convection blower 2 to cool the inside of the main body 1 which has been heated to a high temperature by the heat generated during combustion (step 27) (step 24). ). After that, when the inside of the main body 1 is sufficiently cooled, the energization of the convection blower 2 is stopped (step 28).

In the unlikely event that the user accidentally opens the fan guard 3 in an attempt to clean the convection fan 5 during combustion, it is said that the fan guard 3 is opened by the switch 8 which is the open / close detection means. Is the control means 1
6 (step 20), the control means 16 stops the combustion, and at the same time, the convection blower 2 is energized with a half-wave to apply braking to stop the rotation of the convection fan 5 (step 31).

By the way, as shown in FIG. 3, in general, a motor such as a blower has a maximum value of a current flowing during half-wave energization as compared with a maximum value of a current flowing during steady operation (for example, Ip1 = about 0.5 A). (For example, Ip2 = about 6 A) is very large, about 10 times, and when a half-wave current is simultaneously applied to the two fans of the convection blower 2 and the combustion blower 15, an excessive current flows, so that the device is provided. This causes a problem such as a malfunction of a safety device (not shown) such as a current fuse. Therefore, when the fan guard 3 is opened during combustion, the order of description is reversed to prioritize safety over odor reduction, but the control means 16 stops the energization of the combustion blower 15. At the same time (step 29), the fuel supply means 10 is also stopped (step 30). That is, when extinguishing the fire when the open state of the fan guard 3 is detected, the primary air ratio is maintained to extinguish the flame as in the case of normal extinguishing,
No odor reducing effect can be obtained.

FIG. 4 is an explanatory diagram showing the relationship between the open / closed state of the fan guard, the voltage applied to the convection fan and the combustion fan, and the drive signal in the first embodiment of the present invention. Figure 4
As shown in (a), when the switch 8 detects that the fan guard 3 is opened, the control means 16 sends a half-wave signal as shown in (b) of the figure to the convection blower 2.
A half wave as shown in FIG. 3C is applied to the convection blower 2. At the same time, the control means 16 sends an energization stop signal to the combustion blower 15 as shown in FIG. 4D, and the energization to the combustion blower 15 is stopped as shown in FIG. That is, when a half-wave voltage is applied to the convection blower 2 which is an AC motor, the rotation speed of the convection blower 2 is short time t as shown by the solid line in FIG.
It will stop at 1 (for example, 1 to 3 seconds). This is an extremely short time compared to the time when stopped by inertia indicated by the one-dot chain line.

Embodiment 2. FIG. 5 is a flowchart showing the operation of the controller for the hot air heater according to the second embodiment of the present invention. In addition, the same reference numerals are used for the same or corresponding portions as those in the first embodiment. This Embodiment 2
Is a half-wave having an opposite phase to the half-wave applied to the convection blower 2 is applied to the combustion blower 15.
As described above, when the fan guard 3 is opened by the user during combustion, in order to reduce the unburned amount that causes odor by extinguishing the flame with the ratio of the combustion air and the fuel (primary air ratio) kept constant. A half-wave is energized to the combustion blower 15 (step 32) to apply braking to reduce the air flow rate, and at the same time, stop applying voltage to the fuel supply means 10 (step 30).
Therefore, as shown in the conventional example, the combustion can be stopped while suppressing the odor when extinguishing the fire. At the same time, the combustion blower 15
A half wave having a phase opposite to that of the half wave applied to is applied to the convection blower 2 to apply braking, and the rotation of the convection blower 2 can be quickly stopped (step 33).

FIG. 6 shows the opening / closing of the fan guard 3, the convection blower 2 and the combustion blower 15 according to the second embodiment of the present invention.
FIG. 6 is an explanatory diagram showing a relationship between a voltage applied to the drive signal and a drive signal. As shown in FIG. 6A, when the fan guard 3 is opened by the user's hand by the switch 8 which is an opening / closing detection means, the control means 16 operates as shown in FIG. The wave signal is sent to the convection blower 2, and a half wave as shown in FIG. The processes up to this point are the same as those in FIGS. 4A to 4C of the first embodiment described above.
In the second embodiment, at the same time, the control means 16 is set in FIG.
A half-wave signal is sent to the combustion blower 15 as shown in (d), and a half-wave having a phase opposite to the half-wave applied to the convection blower 2 is sent to the combustion blower 15 as shown in FIG. Apply. That is, according to the second embodiment, in the fire extinguishing operation when the fan guard 3 is open, the convection blower 2 is used.
By supplying half-waves of opposite phases to the two blowers of the combustion blower 15 and the combustion blower 15 at the same time, the rotation speed of the convection blower 2 is stopped in a short time while suppressing an excessive current flowing during the half-wave conduction. In addition, it is possible to extinguish the flame while maintaining the primary air ratio, and it is possible to obtain the odor reducing effect.

[0022]

As described above, according to the first aspect of the present invention, when the open / close detection means detects the open state of the fan guard, the fuel supply means and the combustion blower are de-energized to extinguish the fire. At the same time, the convection blower is energized with a half-wave to brake and stop the rotation, so even if the user accidentally opens the fan guard to clean during combustion, the convection blower can be used immediately. It is possible to stop the blower and provide a safe controller for the hot air heater that is not injured.

According to a second aspect of the present invention, when the open / close detection means detects the open state of the fan guard,
The fuel supply means is stopped, and at the same time as this fuel is reduced, the combustion blower is energized with a half-wave to reduce the amount of air and the premixing during fire extinguishing is performed while making the reduction ratio of fuel and combustion air almost equal. The fire is extinguished so that the concentration of air is kept in the combustible range and the deodorizing effect is obtained, and the half wave energized to the combustion fan and the half wave of the opposite phase are energized to the convection fan to brake and stop the rotation. As a result, even if the user accidentally opens the fan guard for cleaning during combustion, the convection blower can be stopped immediately, and a safe warm air heater that does not cause injury can be provided. Even if half-wave energization is simultaneously applied to the two blowers, it is possible to obtain the deodorizing effect equivalent to that at the time of normal fire extinguishing without suppressing the generation of excessive current and causing the safety device such as the current fuse to malfunction.

[Brief description of drawings]

FIG. 1 is a block diagram of a controller for a hot air heater according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the control device for the hot air heater according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a relationship between a steady current and a half-wave current of the blower according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram showing opening / closing of a fan guard and applied voltages and drive signals to a convection blower and a combustion blower according to Embodiment 1 of the present invention.

FIG. 5 is a flowchart showing the operation of the control device for the hot air heater according to the second embodiment of the present invention.

FIG. 6 is an explanatory diagram showing the relationship between the opening / closing of the fan guard and the voltages applied to the convection blower and the combustion blower and the drive signals in the second embodiment of the present invention.

FIG. 7 is a rear perspective view of a warm air heater as a conventional example.

FIG. 8 is a cross-sectional view of a mounting portion of a convection fan of a warm air heater as a conventional example.

FIG. 9 is a rear perspective view of a conventional warm air heater with a fan guard opened.

FIG. 10 is an explanatory diagram showing a relationship between opening / closing of a fan guard and a control operation of a fan motor of a warm air heater as a conventional example.

FIG. 11 is a configuration diagram showing a liquid fuel combustion apparatus as a conventional example that reduces odors when extinguishing a fire.

FIG. 12 is an explanatory diagram showing a state of reduction of fuel and combustion air at the time of extinguishing a fire as a conventional example.

FIG. 13 is a waveform diagram of an applied voltage when braking is applied to a combustion blower as a conventional example.

[Explanation of symbols]

1 main body of warm air heater, 2 blower for convection, 3 fan guard, 4 fan motor, 5 convection fan, 6 hinge device, 7 thumbscrew, 8 open / close detection means (switch),
9 burner, 10 fuel supply means (pump), 11 fuel tank, 12 fuel supply pipe, 13 air supply pipe, 15
Combustion blower, 16 control means, 18 hot air outlet.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-4-39518 (JP, A) JP-A-7-110164 (JP, A) JP-A-7-71826 (JP, A) JP-A-2000-356412 (JP, A) JP-A-5-87431 (JP, A) JP-A-7-293864 (JP, A) Actual development Sho 61-41554 (JP, U) (58) Fields investigated (Int. Cl. ⁷⁾ , DB name) F24H 3/04 F23N 5/24

Claims (2)

(57) [Claims] 1. A burner, fuel supply means for supplying fuel to the burner, a combustion blower for supplying combustion air to the burner, and convection for releasing hot gas produced by combustion in the burner as warm air. Blower, a fan guard that is provided to cover the convection blower and is pivotally attached by a hinge device or the like, an open / close detection unit that detects the open / closed state of the fan guard, and an open / close detection unit during combustion. When the open state of the fan guard is detected, the fuel supply means is stopped, and at the same time, the combustion blower is de-energized to perform the fire extinguishing operation, and the convection blower is energized with a half wave to stop the rotation. A control device for a hot air heater, comprising: 2. A burner, a fuel supply means for supplying fuel to the burner, a combustion blower for supplying combustion air to the burner, and a convection for releasing hot gas generated by combustion in the burner as warm air. Blower, a fan guard that is provided to cover the convection blower and is pivotally attached by a hinge device or the like, an open / close detection unit that detects the open / closed state of the fan guard, and an open / close detection unit during combustion. When the open state of the fan guard is detected, the fuel supply means is stopped and at the same time the combustion blower is energized with a half wave to extinguish the fire, and as the fuel decreases, the combustion blower is braked to reduce the amount of air. To make the reduction ratios of fuel and combustion air almost equal, and to energize the convection blower with a half-wave opposite in phase to the half-wave energized to the combustion blower to stop the rotation. A control device for a hot air heater, comprising: