JPH0593518A - Blower controller - Google Patents

Abstract

PURPOSE:To make a safe ignition by setting the value of electrifying current the drive motor of a blower in the ignition action of a burner based on the temperature in the room that is detected by a temperature sensor. CONSTITUTION:A controller 30 consists of a blower 8, several drive circuits that drive each valve, and a circuit that detects various kinds of signals. And, an operation control that controls the ignition action and fire extinguishing action for a burner 10 in response to switch operation is made and a temperature control that controls the state of combustion of the burner 10 based on the set temperature of a temperature setting switch 27 and the detected temperature of a temperature sensor 23 in the room and the state of blast of the blower 8 is made. And for the state of control for the blower 8 and a proportional valve 17 eight stage control states are given that correspond to eight stage speeds that are determined according to the difference between the set temperature in the temperature control and detected temperature, and in each control electric current of the values corresponding to respective speeds electrifies the drive motor 8a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a warm air heater for operating a blower to supply combustion air to a burner or a blower to blow hot air heated by a heating source into a room. In particular, the present invention relates to a blower control device that does not have a detection mechanism that detects the operating state of the blower.

[0002]

2. Description of the Related Art In a combustion apparatus in which combustion air is supplied to a burner by the operation of a blower, an igniter is operated and fuel is supplied during an ignition operation, and a drive motor of the blower is supplied with a preset current value. It is energized. Further, in the warm air heater that blows out warm air heated by the heating source into the room by the operation of the blower, the drive motor of the blower is energized with a preset current value when the operation of the heating source is started. ..

[0003]

However, since lubricating oil is used in the bearing portion of the motor of the blower, and the viscosity of this lubricating oil increases when the temperature is low, it becomes a resistance to rotation at low temperatures. For this reason, there are cases in which the fan does not rotate smoothly at low temperatures, and the one controlled by the blower control device that does not detect the operating state of the blower ignites while the blower amount corresponding to the fuel supply amount set for ignition cannot be obtained. There is a problem in that the operation may start and appropriate ignition control may not be possible. Further, in a cross-flow fan type blower used as a blower for blowing warm air into the room, the viscosity of the lubricating oil becomes large even in the bearings of the impeller, so that the resistance becomes greater when driving the impeller. Therefore, when the temperature is low, it may not rotate smoothly, the heating source may operate without obtaining the amount of air to circulate the air, and the inside of the air blower casing including the heating source and the fan may overheat abnormally. There is a problem of doing.

According to the present invention, in a blower control device which does not have a detecting means for detecting an operating state of a blower, combustion air corresponding to a fuel supply amount is supplied at the time of ignition to enable safe ignition, or With the start of operation of the heating source,
The purpose is to reliably supply circulating air and prevent overheating in the blower casing.

[0005]

A first aspect of the present invention is a blower control device for making a drive state of a blower for supplying combustion air to a burner correspond to a fuel supply amount to the burner. The technical means is to set the value of the current supplied to the drive motor of the blower in the ignition operation based on the room temperature detected by the temperature sensor. A second invention of the present invention is a blower for causing a driving state of a blower for taking in indoor air from an air intake port and blowing hot air heated by a heating source from a hot air blowing port to a driving state of the heating source. In the control device,
The technical means is to set the value of the current supplied to the drive motor of the blower at the start of the operation of the heating source based on the room temperature detected by the temperature sensor.

[0006]

In the present invention, a current value based on the room temperature detected by the temperature sensor is supplied, for example, a large current value is supplied when the detected temperature is low, and a small value is supplied when the detected temperature is high. The current value is energized. When the detected temperature is high, the resistance of the lubricating oil in the bearing portion of the motor or the like is small, so that the target rotation can be obtained even by the torque due to the small current value. When the detected temperature is low, the resistance of the lubricating oil is large, so it is difficult to rotate, but since a large torque is given by a large current value, even if the resistance is large, it can overcome the resistance and rotate. It is possible to rotate it close to that of. Therefore, in the first aspect of the invention, even if there is a difference in the room temperature, the required rotation can be obtained and the combustion air corresponding to the fuel supply amount can be supplied to the burner. Further, according to the second aspect of the invention, even if there is a difference in the temperature inside the room, the required number of rotations can be obtained, and the circulating air can be reliably supplied with the operation of the heating source.

[0007]

According to the first aspect of the present invention, the value of the current supplied to the drive motor of the blower at the time of ignition is set based on the temperature detected by the temperature sensor. Therefore, even when the temperature in the room is low and the blower is difficult to rotate. The blower can be reliably rotated, and the required combustion air can be supplied to the burner. Therefore, there is no shortage of combustion air,
Safe ignition is possible. In the second invention,
Based on the temperature detected by the temperature sensor, the value of the current supplied to the drive motor of the blower at the start of operation of the heating source is set, so the blower can be rotated reliably even if the temperature in the room is low and the blower does not rotate easily. The necessary circulating air can be taken in through the air intake and blown out through the warm air outlet. Therefore, there is no shortage of circulating air, and overheating in the blower casing can be prevented.

[0008]

EXAMPLES Next, the present invention will be explained based on examples. The gas fan heater 1 shown in FIG. 1 is provided with an inlet 3 for indoor air and an air inlet 4 for combustion air on the rear surface of the outer casing 2, and a warm air outlet for blowing warm air on the front surface. 5 is provided, and the suction port 3 and the air intake port 4 are covered with a filter 6.

Inside the outer casing 2, there is provided a blower duct 7 formed by communicating the suction port 3 and the warm air blowout port 5, and the blower duct 7 is provided with a blower 8.
The blower 8 drives the impeller 8a that is rotatably arranged in the blower duct 7 and the impeller 8a, and a control device 30 described later.
The blower duct 7 is also a flow-through type that is composed of a motor 8b that can obtain a rotation speed according to the energization current from the blower duct 7.

The warm air outlet 5 is provided with a damper 9 for opening and closing the lower half of the warm air outlet 5, and when the damper 9 is driven by the gad motor 9a, the position of the damper 9 changes to close, half open, The fully open three states are obtained, the blowing direction of the warm air is changed, and especially in the half open state, the floor surface can be effectively warmed. A burner 10 having a combustion chamber communicating with the air intake port 4 is provided in the blower duct 7, and the burner 10 and the air intake port 4 are provided with an air guide tube 11
Connected by.

The air guide tube 11 supplies the combustion air to the burner 1.
0, and also serves as a mixing pipe for the fuel gas and the combustion air. In the air guiding pipe 11, a nozzle 13 serving as the downstream end of the fuel supply pipe 12 for supplying the fuel gas is arranged, The combustion air taken in through the intake port 4 and the fuel gas ejected from the nozzle 13 are further mixed in the mixing chamber 14 on the downstream side to form an air-fuel mixture, which is supplied to the burner plate 10a. The fuel supply pipe 12 is connected to a fuel supply source (not shown) and has two solenoid valves 1 in order from the upstream side.
5, 16 and a proportional valve 17 are provided.

In the gas fan heater 1 of the present embodiment having the above-mentioned configuration, the blower 8 is a convection fan that takes in indoor air from the air intake port 3 and blows warm air from the hot air blow port 5 to circulate the indoor air. In addition, it also acts as a combustion fan for sucking the combustion air from the air intake port 4 and guiding it to the burner plate 10a. The burner 10 is provided with an ignition electrode 21 for igniting by spark discharge and a thermocouple 22 for detecting ignition, and the air intake port 4 detects the temperature of the indoor air sucked. A temperature sensor 23 for

The gas warm air heater 1 having the above structure is
The control device 30 is operated according to the operation of a plurality of switch groups provided on the operation panel provided on the surface of the main body casing 2.
Controlled by. The operation panel is provided with a switch group such as an operation switch 24 and an on-timer operation switch 26 for operating the switch, and a temperature setting switch 27 for setting the room temperature.
Further, a display device (not shown) including some LEDs or the like for displaying the operating state is provided.

The control device 30 is mainly composed of a microcomputer, and comprises several drive circuits for driving the blower 8 or each valve and detection circuits for detecting various signals. Burner 1 accordingly
Operation control for controlling the ignition operation and the extinguishing operation of 0, and temperature control for controlling the combustion state of the burner 10 and the blower state of the blower 8 based on the set temperature of the temperature setting switch 27 and the detected temperature of the indoor temperature sensor 23. And then
The damper 9 is controlled based on the operation duration time, the detected temperature, and the like to enable effective heating such as raising the floor surface temperature and warm air temperature. As the control states of the blower 8 and the proportional valve 17, eight control states corresponding to eight speeds determined according to the temperature difference between the set temperature and the detected temperature in the temperature control are given. In each control, the current value corresponding to each speed is supplied.

Next, the ignition control will be described with reference to FIG. When the operation switch 24 is turned on or turned on at the time set by the timer, the motor 8b of the blower 8 is energized with a current value corresponding to the fourth speed, while the output voltage of the thermocouple 22 is changed. An initial check is made to see if it is normal.

If the initial check is normal, the pre-purge by the blower 8 is started (step 1). In this pre-purge, a current value corresponding to a starting speed of 8 is supplied, and after 0.5 to 1.0 seconds has passed, a current value corresponding to a speed of 7 is supplied to the motor 8b.

At the time when 1 second has elapsed since the pre-purge was started (YES in step 2), the temperature sensor 2 is used to determine the control state of the blower 8 in the ignition operation.
The room temperature T is detected by 3. If the indoor temperature T at this time is less than 5 ° C. (N in step 3
O), the control state of the blower 8 is set to a speed of 5 (step 4), and if it is 5 ° C. or higher (YE in step 3)
S), the control state of the blower 8 is set to speed 1 (step 5), and a current value corresponding to each speed is supplied to the motor 8b. Thereby, for example, when the indoor temperature T is low and the motor 8b is difficult to rotate, a large torque is generated by a large current value, and when the indoor temperature T is relatively high, a small torque by a small current value is generated. However, the motor 8b easily rotates.

When 3 seconds have passed since the current value of the motor 8b was changed to a current value corresponding to the room temperature T and the pre-purge was started (YES in step 6), spark discharge was generated in the ignition electrode 21 as an ignition operation. At the same time as the start, the solenoid valves 15 and 16 and the proportional valve 17 are energized and opened (step 7), and fuel gas is ejected from the nozzle 13. At this time, the proportional valve 17 is initially supplied with a current value corresponding to a speed of 4, and then gradually increased to a current value corresponding to a speed of 7 in 2 seconds. The room air flowing in from the air intake 4 by the pre-purge of the blower 8 passes through the air guide pipe 11 as combustion air and is guided to the mixing chamber 14, where it becomes a mixture with the fuel gas ejected from the nozzle 13. , To the burner 10.

When ignition is performed in the combustion chamber of the burner 10 and ignition is detected based on the detection signal of the thermocouple 22 (YES in step 8), the motor 8b of the blower 8 causes the detection result of the room temperature T described above. Regardless of
In any case, the current value corresponding to the speed 5 is set (step 9), and the current is supplied for 10 seconds (step 1).
0).

Thereafter, as a forced strong heating operation (step 11) for a predetermined time, for example, 60 seconds, when rapid heating is instructed by a rapid heating switch (not shown), rapid heating is instructed at speed 8. If not, the blower 8 and the proportional valve 17 are controlled at a speed of 7, respectively, and then temperature control is performed (step 12). In addition,
If no ignition is detected in step 8, (N
O), until the fixed time (for example, 30 seconds) elapses (NO in step 13), the ignition detection is repeatedly determined in step 8, and if the ignition detection cannot be determined even after the fixed time elapses. (YES in step 13), as a misfire error, the valves are closed to stop the fuel supply and stop the operation (step 14). FIG. 3 shows changes in the control state of the motor 8b of the blower 8 in the above ignition control.

As described above, the gas fan heater 1 of this embodiment does not have a rotation detecting device or the like for detecting the operation of the blower 8, but the ignition operation is performed based on the room temperature before the ignition operation is performed. In order to determine the drive state of the blower 8 at that time, when the blower 8 is difficult to rotate because the temperature is low, a large torque is applied, and therefore the probability that the blower 8 rotates becomes very high. Therefore, combustion air suitable for the amount of fuel gas supplied at the time of ignition can be supplied. Further, the combustion heat of the burner 10 causes the blower duct 7
It is possible to prevent the inside from being abnormally overheated.

In the above-mentioned embodiment, the combustion gas open type heater in which both the convection of the indoor air and the supply of the combustion air are supplied by one blower is shown, but the convection fan and the combustion fan are provided separately. A warm air heater having a heat exchanger, a hot water heater, or other combustion equipment provided with a dedicated blower for supplying combustion air may be used.

[0023]

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a gas fan heater showing an embodiment of the present invention.

FIG. 2 is a flow chart showing ignition control in the control device of the gas fan heater showing the embodiment of the present invention.

FIG. 3 is a time chart showing changes in the control state of the blower in the gas fan heater showing the embodiment of the present invention.

[Explanation of symbols]

 1 Gas Fan Heater 8 Blower 8a Motor (Drive Motor) 10 Burner (Heating Source) 23 Temperature Sensor 30 Control Device (Blower Control Device)

Claims (2)

[Claims] 1. A blower control device for making a drive state of a blower for supplying combustion air to a burner correspond to a fuel supply amount to the burner, wherein a current supplied to a drive motor of the blower in an ignition operation of the burner. A fan control device, wherein the value is set based on an indoor temperature detected by a temperature sensor. 2. A blower control device for causing a driving state of a blower for taking in indoor air from an air intake port and blowing hot air heated by a heating source from a warm air blowing port to a driving state of the heating source. A blower control device, wherein an energization current value to a drive motor of the blower at the start of operation of the heating source is set based on an indoor temperature detected by a temperature sensor.