JP2551178B2 - Control device for hot air heater - Google Patents

Description

TECHNICAL FIELD The present invention relates to a controller for a hot air heater, and more particularly to preheating control of a vaporizing cylinder.

[Prior Art] A conventional device of this type is shown in FIG. FIG. 7 is a block diagram showing a circuit configuration of a conventional controller for a hot air heater. In the figure, (1) is a microcomputer, (2) is a vaporization tube preheating temperature sensor, (3) is an operation switch, and ( 5) is a relay drive circuit, (6) is a relay, and (7) is a vaporization tube preheating heater.

When the operation switch (3) is turned on, a signal is sent from the CPU in the microcomputer (1) to the relay drive circuit (5), and the relay drive circuit (5) drives the relay (6) to preheat the vaporization tube. The heater (7) is energized to start preheating of the vaporizing cylinder.

The temperature of the vaporizing cylinder heated by the vaporizing cylinder preheating heater (7) is detected by the vaporizing cylinder preheating temperature sensor (2), the detection signal is sent to the microcomputer (1), and is converted into a digital value by the A / D converter. It is converted and then input to the CPU. The CPU monitors the temperature of the vaporizing cylinder that is input, and when it reaches a preset optimum temperature for vaporizing the liquid fuel (hereinafter, this temperature is referred to as preheating completion temperature), the relay drive circuit (5 ) To drive the relay (6) to cut off the power supply to the vaporization tube preheating heater (7), complete the preheating of the vaporization tube, and start the next ignition operation.

FIG. 8 is a cross-sectional view showing a part of the configuration of a conventional hot air heater, in which (7) is a vaporization tube preheating heater, (10) is a blower fan, (11) is a blower pipe, and (12). Is the nozzle part,
(13) is an electromagnetic pump, (14) is a constant oil level gauge, (15) is a valve, (16) is a needle part, (17) is a vaporizing cylinder, and (18) is a burner head.

When the operation switch (3) is turned on, the vaporization tube preheating heater (7) is energized, and the preheating of the vaporization tube (17) is completed, the CPU starts the ignition operation and drives the blower fan (10). Combustion air taken in by driving the blower fan (10) is sent to the nozzle portion (12) through the blower pipe (11), and the nozzle portion (12) causes the vaporization cylinder (17).
It is injected into.

On the other hand, the liquid fuel guided to the constant oil leveler (14) by the electromagnetic pump (13) is sent to the needle part (16) by the action of air pressure caused by the start of the valve (15), where the vaporization cylinder is It is atomized by the injection force of the combustion air injected into the inside of the (17), is injected into the vaporization cylinder (17) together with the combustion air, and is mixed with the combustion air inside the vaporization cylinder (17). Since the vaporizing cylinder (17) is preheated by the vaporizing cylinder preheating heater (7), the vaporizing cylinder (17) is vaporized into a combustion gas, which is guided to the burner head (18) and ignited and burned.

[Problems to be Solved by the Invention] Since the above-described conventional control device for the hot air heater is configured and operates as described above, when the temperature of the vaporizing cylinder is cooled, preheating is performed from the cooled temperature. Will be started and it will take time to complete preheating. This causes a problem that even if the combustion operation of the warm air heater is to be temporarily stopped and then restarted after a predetermined time has elapsed, it will take time before ignition is started if the temperature of the vaporization tube is cooled.

To solve this problem, when the combustion operation is temporarily stopped, the vaporization tube preheating heater is continuously energized, and the temperature of the vaporization tube is maintained at the preheating completion temperature even during the operation stop, As in the device disclosed in JP-A-62-46124 "Liquid fuel combustion device", the temperature of the vaporizing cylinder is maintained at a temperature lower than that during operation (heat retention temperature) during operation stop, and power consumption is suppressed. There is a device.

However, in the device as described above, when the temporary stop of the combustion operation is released, the user does not understand this even though the actual waiting time is shortened, and the user feels the waiting time longer or the occurrence of a failure occurs. There is a risk of illusion.

Further, when the room temperature is high, the temperature of the vaporizing cylinder is also higher than the heat retention temperature, and thus the above-mentioned control is not necessary. Further, if it is simply decided whether or not to control the heat retention of the vaporization cylinder at high or low room temperature, a problem of hunting occurs.

The present invention has been made to solve the above problems, and a warm air heater capable of smoothly suppressing heat retention while suppressing electric power consumption as much as possible and shortening a substantial psychological time required for ignition. The purpose is to obtain a control device.

[Means for Solving the Problem] A control device for a hot air heater according to a first aspect of the present invention sets a heat retention temperature lower than a preheating completion temperature in a microcomputer and controls energization to a vaporization cylinder preheating heater. A means for keeping the temperature of the vaporizing tube at the heat retaining temperature is provided, and the blower fan is driven when the operation switch is turned on while the temperature of the vaporizing tube is kept at the heat retaining temperature. .

Further, a controller for a hot air heater according to a second aspect of the present invention is provided with a room temperature detecting means for detecting a room temperature, sets a heat retention temperature lower than a preheating completion temperature in a microcomputer, and energizes a vaporization cylinder preheating heater. Is provided to control the temperature of the vaporization tube and keep the temperature of the vaporization tube at the heat retention temperature when the room temperature is low while preventing hunting.

Further, the control device for the warm air heater according to the third aspect of the present invention includes a room temperature setting unit for setting a desired room temperature in the microcomputer, a room temperature detecting unit for detecting the room temperature, and a temperature lower than the preheating completion temperature for the microcomputer. It is provided with means for setting a heat temperature, controlling energization to the vaporization tube preheating heater to prevent hunting while changing the control value, and keeping the temperature of the vaporization tube at the heat retention temperature only when the room temperature is low. It was decided.

[Operation] In the first invention of the present application, a means for setting the heat retention temperature lower than the preheating completion temperature in the microcomputer and controlling the energization to the vaporization tube preheating heater to maintain the temperature of the vaporization tube at the heat retention temperature is provided. If the operation is switched on while maintaining the heat retention temperature of the vaporization tube, the blower fan is driven, so if the combustion operation is temporarily stopped, the temperature of the vaporization tube is changed. The temperature can be maintained at the heat retention temperature, and when the operation switch is turned on during that time, by driving the blower fan, the substantial and psychological waiting time can be shortened.

Further, in the second invention of the present application, a room temperature detecting means for detecting a room temperature is provided, and a heat retention temperature lower than the preheating completion temperature is set in the microcomputer to control energization of the vaporization cylinder preheating heater while preventing hunting. Since it is equipped with a means to keep the temperature of the vaporization tube at the heat retention temperature, when the combustion operation is temporarily stopped, the temperature of the vaporization tube is automatically adjusted only when the room temperature is low and heat retention of the vaporization tube is required. Control can be performed to maintain the heat retention temperature.

Further, in the third invention of the present application, a room temperature setting means for setting a desired room temperature in the microcomputer, a room temperature detecting means for detecting the room temperature, and a heat retention temperature lower than the preheating completion temperature are set in the microcomputer to obtain a control value. It is possible to prevent hunting while changing the temperature, and to control the energization of the vaporizer preheater to keep the vaporizer temperature at the heat retention temperature.Therefore, even when the combustion operation is temporarily stopped, the room temperature is low. Only when it is necessary to keep the vaporizer heat, it is possible to automatically keep the temperature of the vaporizer barrel at the heat retention temperature, and fine control can be performed at the set room temperature.

[Embodiment] Embodiment 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the first invention of the present application,
FIG. 2 is a flowchart showing the operation.

In the figure, the same reference numerals as those in FIGS. 7 and 8 indicate the same or corresponding portions, and (4) indicates a temporary stop switch. In the embodiment shown in FIG. 1, in the memory of the microcomputer (1), in addition to the preheating completion temperature, a heat retention temperature lower than this temperature (for example, 100 ° C.) is set,
When the temporary stop switch (4) is turned on during combustion, the signal is input to the microcomputer (1), the microcomputer (1) operates to stop the combustion operation, and the vaporization cylinder (17) is turned on. Hold at heat retention temperature.

The control for maintaining the vaporization cylinder (17) at the heat retention temperature is performed by changing the temperature of the vaporization cylinder (17) from the vaporization cylinder preheating temperature sensor (2) to
The CPU opens and closes the relay (6) according to the heat retention temperature set in the memory, and executes the feedback control.

Next, the operation will be described with reference to the flowchart of FIG. In the figure, (S1) to (S12) show respective steps.

Steps S1 to S5 are steps from when the operation switch (3) is turned on to when combustion is started, and the vaporization cylinder preheating heater (7) is turned on by the microcomputer (1).
Then, preheating of the vaporizing cylinder (17) is started, and when the temperature of the vaporizing cylinder (17) reaches the preheating completion temperature, ignition is performed and combustion operation is started.

Then, when the temporary stop switch (4) is turned on during the combustion operation (step S6), the microcomputer (1) stops the combustion operation (step S7), and in the next step S8 feedback control is performed to vaporize the cylinder preheating heater ( 7) ON / OFF
Then, the temperature of the vaporization cylinder (17) is maintained at the heat retention temperature. When the operation switch (3) is turned on in step S9,
In step S10, the microcomputer (1) operates the relay (6) to drive the blower fan (10).

By driving the blower fan (10), the user can know that the combustion operation has started by the rotating sound of the blower fan (10), and the waiting time until ignition does not become a pain, and it is psychological. The waiting time can be shortened.

However, the valve (15) is kept closed so as to prevent the liquid fuel from being sent to the vaporization cylinder (17) whose preheating temperature is still insufficient by the drive of the blower fan (10).

Then, in step S11, the temperature of the vaporization tube (17) is detected again. When the temperature of the vaporization tube (17) reaches the preheating completion temperature, the valve (15) is opened to feed the fuel in step S12, and step S4 Then, the ignition and combustion operation is started.

According to the present invention, when the combustion operation is temporarily stopped as described above, the temperature of the vaporization tube is maintained at a heat retention temperature of about 100 ° C. which can suppress the heat radiation amount and reduce the power consumption, and start the combustion operation. In this case, the waiting time until ignition is shortened, and when the suspension is released, the blower fan is operated to shorten the substantial and psychological waiting time.

Second Embodiment An embodiment of the second invention will be described below with reference to FIGS. 3 and 4. FIG. 3 is a block diagram showing an embodiment of the second invention, and FIG. 4 is a flow chart showing the operation.

In the figure, the same reference numerals as those in FIGS. 7 and 8 indicate the same or corresponding parts, (4) indicates a temporary stop switch, and (8) indicates a room temperature detecting means such as a room temperature detecting sensor.

In the embodiment shown in FIG. 3, in addition to the preheating completion temperature, the heat retention temperature lower than this temperature (for example, 100 ° C.) is set in the memory of the microcomputer (1), while the room temperature detection is performed. The temperature of the room in which the warm air heater is installed is measured by the means (8) by the microcomputer (1).
Sent to.

When the temporary stop switch (4) is turned on during combustion, the signal is input to the microcomputer (1), the microcomputer (1) operates to stop the combustion operation, and the room temperature detection means (8 ), The room temperature is detected, and when the detected room temperature is lower than a predetermined temperature (predetermined value), the microcomputer (1) controls and keeps the vaporization cylinder (17) at the heat retention temperature.

The control for maintaining the vaporization tube (17) at the heat retention temperature is performed by changing the temperature of the vaporization tube (17) from the vaporization tube preheating sensor (2) to the CPU.
The relay (6) compared with the heat retention temperature set in the memory
Is opened and closed and is executed by feedback control.

Next, the operation will be described with reference to the flowchart of FIG. In the figure, (S1) to (S12) show respective steps.

The operations performed in steps S1 to S5 are the same as those in the flowchart of FIG. 2, and the description thereof will be omitted here.

Then, when the temporary stop switch (4) is turned on during the combustion operation (step 6), the microcomputer (1) stops the combustion operation (step S7), and the room temperature detecting means (8) detects it at the next step S8. It is determined whether the room temperature is equal to or higher than a predetermined temperature (predetermined value). When the room temperature is equal to or higher than the predetermined value, the vaporization tube preheating heater (7) is turned off, and the predetermined temperature for determining the room temperature set in the microcomputer (1) in the next step S11 is lowered a little (-α )do it,
Move to step S12.

If the room temperature detected in step S8 is lower than or equal to the predetermined temperature, the vaporizer preheater (7) is turned on / off by feedback control in step S9, and the vaporizer (17) temperature is maintained at the heat retention temperature. . When the vaporization cylinder (17) is kept at the heat retention temperature, the predetermined temperature for judging the room temperature set in the microcomputer (1) at step S10 is made slightly higher (+ α), and then the process proceeds to step S12. This prevents the vaporizing cylinder preheating heater (7) from hunting due to slight changes in room temperature.

When the operation switch (3) is turned on in step S12, the process proceeds to step S2, the temperature of the vaporizing cylinder (17) is heated to the preheating completion temperature, and the ignition and combustion operation is started.

This invention, when the combustion operation is temporarily stopped in the following manner, can keep the heat of the vaporization cylinder at a low temperature and suppress the heat dissipation while reducing the power consumption only when the room temperature is low. The temperature is maintained, and the waiting time until ignition which is a problem especially when the room temperature is low is shortened.

Embodiment 3 An embodiment of the third invention will be described below with reference to FIGS. 5 and 6. FIG. 5 is a block diagram showing an embodiment of the third invention, and FIG. 6 is a flow chart showing the operation.

In the figure, the same reference numerals as those in FIGS. 7 and 8 indicate the same or corresponding portions, (4) is a temporary stop switch, (8) is room temperature detecting means, and (9) is room temperature setting means for setting a desired room temperature. Show. In the embodiment shown in FIG. 5, in addition to the preheating completion temperature, the memory of the microcomputer (1)
A heat retention temperature lower than this temperature (for example, 100 ° C.) is set, and a desired room temperature can be set by the room temperature setting means (9). The room temperature detected by the room temperature detecting means (8) is sent to the microcomputer (1).

When the temporary stop switch (4) is turned on during combustion, the signal is input to the microcomputer (1), the microcomputer (1) operates to stop the combustion operation, and the room temperature detecting means (8). Detects the room temperature at that time, and when the detected room temperature is lower than the set temperature set by the room temperature setting means (9) by a predetermined temperature or more, the microcomputer (1) controls the vaporization tube (17). Hold at heat retention temperature.

The control for maintaining the vaporization tube (17) at the heat retention temperature is performed by changing the temperature of the vaporization tube (17) from the vaporization tube preheating sensor (2) to the CPU.
The relay (6) compared with the heat retention temperature set in the memory
Is opened and closed and is executed by feedback control.

Next, the operation will be described with reference to the flowchart of FIG. In the figure, (S1) to (S12) show respective steps.

The operations performed in steps S1 to S5 are shown in FIG.
Since it is the same as the flowchart of FIG. 4, its description is omitted here.

Then, when the temporary stop switch (4) is turned on during the combustion operation (step S6), the microcomputer (1) stops the combustion operation (step S7), and the room temperature detection means (8) detects it in the next step S8. It is determined whether or not the room temperature thus set falls below the predetermined temperature range (α) set by the room temperature setting means (9), and the room temperature is within the predetermined temperature range (α). In this case, the vaporization tube preheating heater (7) is turned off, and in the next step S11, the control value of this predetermined temperature range (α) is increased to, for example, 6 ° C.
Move to.

If the control detected in step S8 falls below the set temperature by a predetermined temperature range (α) or more,
In S9, the vaporization tube preheating heater (7) is turned on / off by feedback control, and the temperature of the vaporization tube (17) is maintained at the heat retention temperature. When keeping the vaporizing cylinder (17) at the heat retention temperature,
In step S10, the control value of the predetermined temperature range (α) is reduced to, for example, 5 ° C. to prevent hunting of the vaporization tube preheating heater (7) due to a slight change in room temperature.

When the operation switch (3) is turned on in step S12, the process proceeds to step S2, the temperature of the vaporizing cylinder (17) is heated to the preheating completion temperature, and the ignition and combustion operation is started.

In the present invention, when the combustion operation is temporarily stopped as described above, only when the detected room temperature falls below the predetermined temperature range from the set temperature set by the room temperature setting means,
Preventing hunting while changing the control value,
The temperature of the vaporizing cylinder can be controlled to reduce the amount of heat radiation and reduce power consumption.
The temperature is kept at about 100 ° C to reduce the waiting time until ignition, which is a problem especially when the room temperature is low.

[Effect of the Invention] As described above, the first invention of the present application consumes electric power by controlling the temperature of the vaporization tube to be maintained at a heat retention temperature that suppresses heat dissipation when the operation is temporarily stopped. It is possible to reduce the time required for ignition while suppressing the
When the temporary suspension is released, the blower fan can be operated immediately, and the effect of substantially and physically waiting time can be shortened.

Further, as described above, in the second invention of the present application, when the operation is temporarily stopped, when the room temperature is low, the temperature of the vaporization tube is controlled to be maintained at the heat retention temperature that suppresses heat radiation, and hunting is prevented. Therefore, it is possible to reduce the waiting time required for ignition, which is a problem particularly when the room temperature is low, while suppressing the power consumption as much as possible.

Further, as described above, in the third invention of the present application, when the operation is temporarily stopped, when the room temperature is low, the temperature of the vaporization tube is controlled to be maintained at the heat retention temperature at which the heat radiation is suppressed, and the control value is changed. While preventing hunting while suppressing power consumption as much as possible, it is possible to shorten the waiting time required for ignition, which is particularly problematic when the room temperature is low, and it is possible to perform fine control at the set room temperature. .

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the first invention of the present application,
FIG. 2 is a flowchart showing the operation of the first invention, and FIG.
FIG. 4 is a block diagram showing an embodiment of the second invention of the present application, and FIG.
FIG. 5 is a flow chart showing the operation of the second invention, FIG. 5 is a block diagram showing an embodiment of the third invention of the present application, FIG. 6 is a flow chart showing the operation of the third invention, and FIG. FIG. 8 is a block diagram showing a circuit configuration of the device, and FIG. 8 is a sectional view showing a part of the configuration of the warm air heater. In the figure, (1) is a microcomputer, (2) is a vaporization tube preheat sensor, (3) is an operation switch, (4) is a temporary stop switch, (5) is a relay drive circuit, (6) is a relay, (7). Is a vaporizer preheater, (8) is room temperature detecting means, (9) is room temperature setting means, (10) is a blower fan, (1
5) is a valve. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (3)

(57) [Claims] 1. A heater for preheating a vaporizing tube, a temperature sensor for detecting the temperature of the vaporizing tube, and a computer for controlling the operation of the entire warm air heater, and starts a combustion operation. In controlling the energization of the heater with the computer, the controller of the hot air heater for controlling the temperature of the vaporization cylinder to the optimum preheating completion temperature for vaporizing the liquid fuel, the preheating completion temperature to the computer. A temperature setting means for setting a lower heat retention temperature, which keeps the temperature of the vaporization tube at the heat retention temperature while controlling energization of the heater by the computer when the combustion operation of the hot air heater is temporarily stopped. Temperature holding means for driving the blower fan when the suspension is released while the temperature of the vaporization cylinder is held at the heat retention temperature by the temperature holding means. A controller for a warm air heater, comprising: a moving means. 2. A heater for preheating the vaporizing cylinder, a temperature sensor for detecting the temperature of the vaporizing cylinder, and a computer for controlling the operation of the warm air heater as a whole, and start the combustion operation. In controlling the energization of the heater with the computer, the temperature of the vaporizing cylinder is controlled to the optimum preheating completion temperature for vaporizing the liquid fuel, in the controller of the warm air heater, the warm air heater is installed. Room temperature detecting means for detecting the room temperature, temperature setting means for setting a heat retention temperature lower than the preheating completion temperature in the computer, and the room temperature detecting means when the combustion operation of the hot air heater is temporarily stopped. A temperature holding means for holding the temperature of the vaporizing cylinder at the heat retention temperature while controlling the energization of the heater by the computer when the room temperature detected by Controller of the warm air heater characterized and. 3. A heater for preheating the vaporizing tube, a temperature sensor for detecting the temperature of the vaporizing tube, and a computer for controlling the operation of the entire warm air heater, and start the combustion operation. In controlling the energization of the heater with the computer, in the controller of the warm air heater for controlling the temperature of the vaporization cylinder to the optimum preheating completion temperature for vaporizing the liquid fuel, the desired room temperature for the computer is set. Room temperature setting means for setting, room temperature detecting means for detecting the temperature of the room in which the warm air heater is installed, temperature setting means for setting a heat retention temperature lower than the preheating completion temperature to the computer, When the combustion operation is temporarily stopped and the room temperature detected by the room temperature detecting means falls below a preset temperature range set by the room temperature setting means by a predetermined temperature range or more, Controller of the warm air heater, characterized in that the temperature of the vaporizing tube while controlling the energization to said heater with a temperature retaining means for retaining to the heat retaining temperature by computer.