JP2020091065A - Combustor - Google Patents

Abstract

To provide a combustor capable of securing a service life of a damper motor for driving a damper.SOLUTION: A combustor 1 comprises a burner unit 2, an air supplier 3 that supplies air to the burner unit 2, a ventilation passage 33 that communicates with the air supplier 3 and the burner unit 2, and a damper mechanism 4 that is provided in the ventilation passage 33. The damper mechanism 4 comprises a damper 42 that opens and closes the ventilation passage 33, and a damper motor 43 that drives the damper 42. The damper 42 is stopped at a fully open position of maximizing the cross-sectional area of the ventilation passage 33 at a position where the damper mechanism 4 is provided by being brought into contact with an open side stopper 41b, and a predetermined position before a fully closed position of minimizing the cross-sectional area by being brought into contact with a closed side stopper 41a.SELECTED DRAWING: Figure 1

Description

The present invention relates to a combustion device used for a heater or a water heater.

Conventionally, as this type, for example, a combustion device described in Patent Document 1 is known. The combustion device described in Patent Document 1 has a re-ignition operation and a re-ignition operation in which the ignition detection unit does not detect ignition in the ignition operation, and the blower and the flow rate pump are re-activated to ignite by the ignition means. When the ignition detection unit has not detected ignition, the damper is moved to the closed position, the blower and the flow rate pump are operated, and the re-ignition operation of igniting by the ignition means is performed.

As shown in FIG. 9, a damper unit 400 of a conventional combustion apparatus 100 (Patent Document 1) moves a damper 420 to a closed position and then operates a blower and a flow rate pump to generate a premixed gas, Ignition operation is performed to ignite it by the ignition means.

JP, 2003-185133, A

By the way, in the conventional combustion device 100 (patent document 1), as shown in FIG. 10, a damper motor 430 (stepping motor) for driving the damper 420 rotates the damper 420 to a fully closed position or a fully opened position, and the stopper 411. After hitting 412, it is further rotated by 300 steps to keep the energized state and prevent the damper 420 from moving from the fully closed position and the fully opened position. At this time, an external force is applied to the gear portion of the damper motor 430.

Here, when a drive pulse is further input in the closing and opening directions when the damper motor 430 is in the closed state and the maximum open state of the damper 420, the rotating shaft of the rotor of the motor slips at a certain point and the load applied to the damper motor 430 is increased. Although it may be reduced once, the damper motor 430 is controlled so that the damper motor 430 is rotated further by 300 steps after the damper 420 abuts on the stoppers 411 and 412 as long as the energization continues. Therefore, in the damper motor 430, a state in which the force of the damper 420 abutting against the stoppers 411 and 412 in the closed position and the open position is repeatedly generated, which occurs for a long time. As a result, the damper motor 430 has a problem that its life is shortened due to the external force applied to the motor itself and the motor gear.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a combustion device capable of ensuring the life of a damper motor that drives a damper.

In order to solve the above problems, the present invention provides a burner unit, an air supply device that supplies air to the burner, an air supply device that communicates with the air supply device, and the burner unit. A damper device provided, wherein the damper mechanism includes a damper that opens and closes the air passage, and a damper motor that drives the damper, the damper contacting an open side stopper. A predetermined position in front of the fully open position that maximizes the cross-sectional area of the air passage at the position where the damper mechanism is provided by contacting it, and the fully closed position that minimizes the cross-sectional area by contacting the closing-side stopper. It is stopped at a position.

Here, the predetermined position where the damper is stopped by the damper motor is an arbitrary preset position before the fully open position and the fully closed position, and the angle is 1 from the fully open position and the fully closed position where the damper contacts the stopper. It is at a position in the range of ° to 4°, and more preferably in a position at an angle of 2° from the fully open position and the fully closed position.

INDUSTRIAL APPLICABILITY The present invention can provide a combustion device capable of ensuring the life of a damper motor that drives a damper.

It is a principal part schematic block diagram which shows an example of the combustion apparatus which concerns on embodiment of this invention. It is a schematic expansion perspective view which shows a damper unit. It is explanatory drawing which shows the closed state and open state of a damper. It is a characteristic view which shows the relationship between the amount of oil in a combustion device, and the rotation speed of a blower. It is a schematic expanded perspective view of the damper unit which shows the 1st modification of the combustion device which concerns on embodiment of this invention. It is explanatory drawing which shows the state at the time of switching from the closed state of the damper of a 1st modification to an open state. It is explanatory drawing which shows the state at the time of switching from the open state of the damper of a 1st modification to a closed state. It is explanatory drawing which shows the closed state and open state of the damper which shows the 2nd modification of the combustion apparatus which concerns on embodiment of this invention. It is a schematic expanded perspective view which shows the damper unit of the conventional combustion device. It is explanatory drawing which shows the closed state and open state of the conventional damper.

A combustion device 1 according to an embodiment of the present invention will be described in detail with reference to the drawings as appropriate.
In each drawing, common or similar components are designated by the same reference numerals, and redundant description thereof will be appropriately omitted.

A combustion device 1 shown in FIG. 1 is a device that burns fuel such as fuel oil. The combustion device 1 is provided, for example, in a boiler device (not shown) capable of hot water supply, hot water heating, and additional heating of a bath. The combustion device 1 includes an outer frame (not shown) of a boiler device installed outdoors, a burner part 2 provided in the outer frame, an air supply device 3 for supplying air to the burner part 2, and an air supply device. 3 and the burner unit 2, and a damper mechanism 4 provided between the air supply device 3 and the burner unit 2.

The outer frame (not shown) is a casing (exterior member) of the boiler device formed by a frame member such as a reinforcing plate and a panel member such as a front door. Inside the outer frame, a functional chamber is formed in the center, a tank chamber is formed below, and an exhaust chamber is formed above. A burner unit 2 for burning fuel such as vaporized petroleum, and a cylindrical can-shaped can body (not shown) for heating a heat medium such as water stored inward by the combustion of the burner unit 2 are provided in the function chamber. , And an air supply device 3 that sucks combustion air from the outside of the outer frame and supplies the combustion air to the burner unit 2.

As shown in FIG. 1, the air supply device 3 is a device that supplies air to the carburetor 211 and the combustion unit 22. The air supply device 3 includes an air supply pipe 31, a blower 32, and an air passage 33.

The air supply pipe 31 is a pipe for taking in outside air (combustion air) from the periphery of a combustion air supply port (not shown) provided in the upper part of the outer frame by the blower 32 being rotationally driven and sending the air to the air blower 32. Is. The air supply pipe 31 extends from an exhaust chamber (not shown) to a functional chamber (not shown).

The blower 32 is a combustion fan provided between the air supply pipe 31 and the air passage 33. The blower 32 includes a fan motor 32a and a blade portion 32b rotated by the fan motor 32a. The rotation speed of the blower 32 is controlled by a microcomputer (control device) according to the combustion amount.

The blower path 33 is a flow path for supplying combustion air to the burner unit 2 via the damper mechanism 4. In other words, the air passage 33 is an air supply passage that communicates the fuel injection nozzle 23 with the guide passage 24 fixed to the ceiling surface via the damper housing 41 and supplies combustion air via the guide passage 24. is there. The combustion air supply port 33a at the downstream end of the air blowing path 33 is connected to the air blowing port 41c formed on the upper surface of the damper housing 41 of the damper mechanism 4 described later. The air passage 33 communicates with the air outlet 41c of the damper mechanism 4 and the carburetor 211 and the combustion unit 22 which are arranged in a direction bent from the air passage 33 at a substantially right angle.

Further, the combustion air that has not flowed in the guide passage 24 in the blower passage 33 passes through the outer periphery of the carburetor 211 to cool the combustion chamber 224, and then passes through the air chamber 26 to pass from the secondary air hole (not shown) to the burner portion. 2 is supplied as secondary air for combustion.

As shown in FIGS. 1 and 2, the damper mechanism 4 includes a damper unit 40 provided in the air passage 33. The damper mechanism 4 includes a damper housing 41, a damper 42 that opens and closes the air passage 33, a damper motor 43 that drives the damper 42 between an open position and a closed position, and a drive shaft provided on the base end side of the damper 42. 44 and a shaft support portion 45 for supporting the drive shaft 44 on the damper housing 41.

The damper housing 41 is a substantially box-shaped metal housing that forms the air passage 33 in the damper unit 40 and supports the components of the damper unit 40. The damper housing 41 has an air outlet 41c formed on the upper surface and an air outlet 41d formed on the side surface on the side of the burner portion 2 and is provided in the damper unit 40 from the air outlet 41c toward the air outlet 41d. An inverted L-shaped air passage 33 is formed in a side view, and further, in the damper casing 41, a closing-side stopper 41a formed at an opening edge of the outlet 41d and an inner bottom of the damper casing 41 are formed. And the opened side stopper 41b.

When the damper 42 rotates to the fully closed position, the closing side stopper 41a stops by contacting at the fully closed position to support the damper 42 in the vertical fully closed state and suppress the rotation. Is. The open-side stopper 41b is a stopper that, when the damper 42 is rotated to the fully open position, stops by abutting at the fully opened position to support the damper 42 in a tilted fully opened state and suppress the rotation. The combustion air supply port 33a of the air supply device 3 is connected to the blower port 41c. A guide passage 24 in which the fuel injection nozzle 23 is installed is provided in the delivery port 41d.

The damper 42 is composed of a plate member (lid-shaped member) having an inverted L shape in side view, which opens and closes the air passage 33 in the damper housing 41. As shown in FIG. 3, the damper 42 is rotated in the opening/closing direction by the damper motor 43 and is stopped at a predetermined position before the fully open position and the fully closed position (2° before the fully closed position and the fully open position). , The closing side stopper 41a and the opening side stopper 41b are not contacted. The damper motor 43 is composed of a stepping motor and is configured to rotate the damper 42 by 1° in 10 steps. Then, the damper 42 is configured to stop at a predetermined position where the damper motor 43 is rotationally driven from 0 step to 20 steps in the closed position. Further, the damper 42 is configured to stop at a predetermined position in which the damper motor 43 is rotationally driven from 700 steps at the fully closed position to 680 steps before 20 steps in the open position state.

As described above, the predetermined position at which the damper 42 is stopped by the damper motor 43 is a position determined by the number of steps of the damper motor 43, and from the closing side stopper 41a and the opening side stopper 41b before the fully open position and the fully closed position. The positions are slightly apart (angle 2°).

In the Lo combustion range B (see FIG. 4), the damper 42 is rotated in a vertical state by driving the damper motor 43, and is in a closed position state in which the outlet 41d is substantially closed. The damper 42 separates the gap formed between the damper 42 and the air outlet 41d by separating from the closing side stopper 41a in the closed position, and the air passage 33 between the outer periphery of the damper 42 and the inner wall surface of the damper housing 41. The air blowing gap and the four air holes 42a having a diameter of about 4 mm formed in the damper 42 reduce the air blowing pressure and the air blowing amount at the same time to obtain the optimum combustion air amount according to Lo combustion.
Also in the case of the Hi combustion range A (see FIG. 4), the damper 42 is inclined downward of the blower opening 41c to the open position and stops at a predetermined position before the fully open position that does not contact the open side stopper 41b. Therefore, turbulent flow can be prevented by guiding the air flow.

As shown in FIGS. 1 and 2, the damper motor 43 is a motor device that drives the damper 42 between an open position and a closed position. The damper motor 43 is screwed to a position on the lower end of the side surface of the damper housing 41 near the delivery port 41d. The damper motor 43 is internally provided with a gear reduction mechanism, and is configured to be decelerated when the drive shaft 44 rotates. The damper motor 43 is de-energized when the damper 42 is stopped at a predetermined position before the fully open position and the fully closed position.

The drive shaft 44 is a rotating shaft that has a gear that meshes with the gear reduction mechanism of the damper motor 43 at one end, and that the gear is rotated by the damper motor 43 to rotate the damper 42 to the open/close position. A central portion of the drive shaft 44 is coupled to a base end portion (lower end portion) of the damper 42, and both end portions of the central portion are rotatable with respect to a shaft support portion 45 provided at a lower end portion of the damper housing 41. Is supported by. The damper 42 is attached to the drive shaft 44 with play in the opening/closing direction.

The shaft support portion 45 is formed of a metal plate member that is formed to project upward from the inner bottom of the damper housing 41 and has a shaft hole for supporting the drive shaft 44. The shaft support portion 45 includes a pair of left and right plate members fixed to the inner bottom of the damper housing 41 on the delivery port 41d side and having a recessed shape in a side view.

As shown in FIG. 1, the burner unit 2 includes a vaporization unit 21 and a combustion unit 22. The burner part 2 is installed at a position near the lower part in the outer frame.
The vaporizer 21 includes a vaporizer 211 and a mixing chamber 212 provided below the vaporizer 211.

The vaporizer 211 is a device that vaporizes the fuel supplied from the flow rate pump 232. The vaporizer 211 is formed in a horizontal bowl shape by aluminum die casting. The vaporizer 211 is provided with a vaporizer heater 213 as a heater for heating the fuel oil to a temperature at which it can be vaporized. A fuel injection nozzle 23 that sprays fuel oil onto the carburetor 211 is provided on the front surface of the carburetor 211.

The mixing chamber 212 is an aluminum die-cast space provided below the vaporizer 211. In the mixing chamber 212, the fuel oil (vaporized gas) vaporized by the vaporizer 211 and the primary air are premixed.
As shown in FIG. 1, the vaporizer heater 213 is composed of a U-shaped sheathed heater cast in the vaporizer 211.

The combustion unit 22 is provided above the mixing chamber 212 and on the back side of the carburetor 211, and burns the premixed gas premixed in the mixing chamber 212 in the combustion chamber 224 having an opening at the top. Above the combustion section 22, there are a spark plug 221 that ignites by spark discharge at the tip, and a frame rod 222 that detects a combustion state by detecting a current flowing in the flame generated in the burner section 2. It is arranged. Electric power for discharging is supplied from the igniter 223 to the spark plug 221.

The fuel oil stored in the leveler tank 231 is pressure-fed by the flow rate pump 232 to the fuel injection nozzle 23 via the oil feed pipe 233. Fuel is pumped up to the leveler tank 231 by a pumping pump 234 from a fuel tank installed outside.

The flow rate pump 232 is a flow rate pump that pressure-feeds the fuel to the fuel injection nozzle 23 via the oil feed pipe 233. The flow rate pump 232 works in conjunction with the blower 32 and the damper 42 to change the fuel supply amount according to the load, from the Hi combustion range A (see FIG. 4) to the Lo combustion range B (see FIG. 4) to ignition combustion. The combustion amount of the burner unit 2 is controlled.

An air chamber 26 is formed between the burner portion 2 and the cover frame 25. The combustion air supplied to the burner section 2 by the operation of the blower 32 is supplied to the vaporization section 21 as primary air for premixing, and is also combusted in the combustion section 22 through the air chamber 26 below the mixing chamber 212. Is supplied as secondary air.

[Action]
Next, the operation of the combustion device 1 according to the embodiment of the present invention will be described.
When operating the combustion device 1, first, the carburetor heater 213 shown in FIG. 1 is energized to heat the carburetor 211 to a predetermined temperature, and this is detected by a temperature sensor (not shown) provided at a proper position. The blower 32 and the flow rate pump 232 are driven. Fuel is supplied to the carburetor 211 from the fuel injection nozzle 23, and combustion air is supplied from the ejection ports.
Then, the fuel injected from the fuel injection nozzle 23 is vaporized with the combustion air by the vaporizer 211 and is also mixed with the vaporized gas to obtain a mixed gas. If the mixed gas is appropriately ignited by the spark plug 221, combustion is started.

In the Hi combustion range A (see FIG. 4), the combustion amount is the maximum point a (see FIG. 4) of the Hi combustion range A, the damper 42 is in the open position (predetermined position), and the rotation speed of the blower 32 is also maximum. Is set to. In order to reduce the amount of combustion, the frequency of the flow rate pump 232 is lowered and the rotation speed of the blower 32 is reduced. Then, the minimum point b of the Hi combustion range A (see FIG. 4) is reached, and even in this state, the damper 42 is still in the open position of the predetermined position.

As shown in FIG. 3, when the damper 42 is in the open position, it stops at a predetermined position before the fully open position and is not in contact with the open side stopper 41b at the fully open position. Therefore, when the damper motor 43 is rotated to the open position, the damper motor 43 is stopped at a predetermined position of 680 steps before the fully open position of 700 steps (a position 2° before the fully open position), so that an extra external force is applied. It does not take.

When the damper 42 stops in the open position (predetermined position), the damper motor 43 is de-energized. When the damper 42 is stopped in the open position (predetermined position), the air blown from the blower 32 hits the damper 42 in the direction that opens the damper 42, that is, the direction that moves the damper 42 toward the open side stopper 41b. Even when the power supply to 43 is cut off, the damper 42 does not operate in the closing direction. Even if the damper 42 moves due to blowing air when the damper 42 is stopped in the open position state (predetermined position), the damper 42 only abuts on the open side stopper 41b, and a large external force as in the conventional case is applied. Of course, there is no problem even if the power supply to the damper motor 43 is cut off.

Then, when the combustion amount is further reduced from the point b shown in FIG. 4, the frequency of the flow pump 232 is decreased while rotating the damper 42 from the open position to the closing direction without changing the rotation speed of the blower 32. If (the amount of oil is reduced), it reaches the c'point of the Lo combustion range B (the damper 42 becomes the closed position state at the c'point), and further, the rotational speed of the blower 32 is reduced from the c'point and the flow rate is reduced. When the frequency of the pump 232 is reduced (the amount of oil is reduced), the combustion amount can be reduced to point d (see FIG. 4).

Conversely, when the combustion amount is further increased from the point c shown in FIG. 4, the frequency of the flow pump 232 is increased while rotating the damper 42 from the closed position to the opening direction without changing the rotation speed of the blower 32. If (the amount of oil is increased), it is moved to the b'point of the Hi combustion range A (the damper 42 is in the open position at the b'point), and the rotation speed of the blower 32 is further increased from the b'point. When the frequency of the flow rate pump 232 is increased (the oil amount is increased), the combustion amount can be increased up to the point a (see FIG. 4).

In this way, the combustion device 1 can obtain a wide combustion variable range in the two stable combustion regions of the Hi combustion range A and the Lo combustion range B by opening and closing the damper 42.
The d point, which is the minimum thermal power point in the Lo combustion range B, also serves as the ignition combustion range, although it is only one point.

As shown in FIG. 3, the damper 42 is stopped at a predetermined position before the fully closed position and is not in contact with the closed side stopper 41a at the fully closed position in the closed position. . Therefore, when the damper motor 43 is rotated to the closed position, the damper motor 43 is stopped at a predetermined position of 20 steps before the fully closed position of 0 step (a position 2° before the fully closed position). No external force is applied.

When the damper 42 stops at the closed position (predetermined position), the damper motor 43 is de-energized. When the damper 42 is stopped in the closed position state (predetermined position), the blower 32 blows air in the direction in which the damper 42 is closed, that is, in the direction in which the damper 42 is directed toward the closing-side stopper 41a. Even when the power supply to 43 is cut off, the damper 42 does not operate in the opening direction. Even if the damper 42 moves due to the air blow while the damper 42 is stopped in the closed position state (predetermined position), the damper 42 only abuts on the closing side stopper 41a, and a large external force as in the prior art is applied. There is no problem even if the power supply to the damper motor 43 is cut off.

As described above, according to the present invention, the burner unit 2 shown in FIG. 1, the air supply device 3 that supplies air to the burner unit 2, the air supply device 3, and the air passage 33 that communicates with the burner unit 2 and the air blower. The damper device 4 is provided with a damper mechanism 4 provided in the passage 33, and the damper mechanism 4 includes a damper 42 that opens and closes the air passage 33, and a damper motor 43 that drives the damper 42. Is a fully open position that maximizes the cross-sectional area of the air passage 33 at the position where the damper mechanism 4 is provided by contacting the open-side stopper 41b, and minimizes the cross-sectional area by contacting the close-side stopper 41a. It is stopped at a predetermined position before the fully closed position.

With this configuration, the damper 42 of the combustion device 1 is stopped at a predetermined position before the fully open position and the fully closed position when the damper 42 is rotated in the opening/closing direction by the damper motor 43. Therefore, the combustion device 1 can be applied to a member or the like that stops the damper 42 so that the damper motor 43 is not loaded. As a result, the damper motor 43 that drives the damper 42 is less likely to fail, and the life and reliability can be ensured.

Further, it is preferable that the damper motor 43 be de-energized when the damper 42 is stopped at a predetermined position.

According to this configuration, the damper motor 43 is deenergized when the damper 42 is rotated to a predetermined position and stopped, so that power saving can be achieved.

Further, the predetermined position of the damper 42 is preferably determined by the number of steps of the damper motor 43.
Here, the number of steps is an arbitrary number of steps of the damper motor 43 when the damper 42 reaches a position before a preset position before the fully open position and the fully closed position. For example, the number of steps in the case where the damper motor 43 rotates the damper 42 at an angle of 1° by 10 steps is 10 steps to 40 steps, and more preferably 20 steps.

According to this configuration, the damper 42 automatically stops at a predetermined position when the damper motor 43 rotates up to a predetermined number of steps set in advance. Therefore, the damper motor 43 does not contact the closing-side stopper 41a and the opening-side stopper 41b by setting the predetermined number of steps as the number of steps when the damper 42 is rotated to the position just before the fully open position and the fully closed position. Stop at position. Therefore, it is possible to prevent an extra external force from being applied when the damper motor 43 stops.

[First Modification]
It should be noted that the present invention is not limited to the above-described embodiment, and various modifications and changes can be made within the scope of the technical idea thereof, and the present invention also extends to these modified and changed inventions. Of course.

FIG. 5 is a schematic enlarged perspective view of a damper unit showing a first modified example of the combustion apparatus according to the embodiment of the present invention. FIG. 6 is an explanatory diagram showing a state when the damper of the first modified example is switched from the closed state to the open state. FIG. 7: is explanatory drawing which shows the state at the time of switching from the open state of the damper of a 1st modification to a closed state.

In the above embodiment, the microcomputer (control device) detects a signal from an encoder provided on the motor shaft of the damper motor 43 shown in FIG. 2 to measure the number of steps of the damper motor 43, which is the opening/closing position of the damper 42. Although the predetermined position has been determined, it is not limited to this.

As shown in FIGS. 5 to 7, it is preferable that the predetermined position of the damper 42 is determined by the close sensor S1 and the open sensor S2 (position sensor) that detect the position of the damper 42.

In this case, as shown in FIG. 5, the damper motor 43 is screwed to the side surface of the damper housing 41 with the sensor mounting bracket 46 having the close sensor S1 and the open sensor S2 mounted therebetween. An end portion of the drive shaft 44 on the damper motor 43 side is arranged in the damper motor 43 by inserting the side surface of the damper housing 41, the sensor mounting bracket 46, and the sensor operating member 47. A transmission gear (not shown) that meshes with a reduction gear mechanism (not shown) arranged in the damper motor 43 is provided at the end of the drive shaft 44 on the damper motor 43 side.

The sensor operating member 47 is a plate member that is fitted onto the drive shaft 44 and rotates integrally with the drive shaft 44. On the outer peripheral portion of the sensor operating member 47, when the damper 42 is in the closed position state and the open position state (predetermined position), a protruding piece disposed inside the closed sensor S1 and the open sensor S2 having an inverted concave shape in side view. The shaped sensor detected portion 47a is formed to project.

The close sensor S1 is a position sensor that detects whether the damper 42 is in the closed position state (predetermined position). The open sensor S2 is a position sensor that detects whether the damper 42 is in the open position state (predetermined position). In the closed sensor S1 and the open sensor S2, a light emitting element is installed on one side of the recesses S1a and S2a of the inverted concave sensor case, and a light receiving element is installed on the other side of the recessed sensor S1a and S2a. It is an optical sensor that indirectly detects the position of the damper 42 by detecting whether or not there is a 47a. The close sensor S1 and the open sensor S2 are, for example, photo interrupters.

According to this configuration, as shown in FIGS. 6 and 7, the damper 42 is at the predetermined position by the closing sensor S1 and the opening sensor S2 when it is rotated to the predetermined position (closed position and open position) set in advance. Is indirectly detected. When the damper motor 43 is rotated to the predetermined position and is in the closed position state and the open position state, the damper motor 43 receives a signal from the microcomputer (control device) based on the position detection signals from the close sensor S1 and the open sensor S2. It is stopped before the closed position and the fully open position. Therefore, when the damper motor 43 is stopped at the closed position or the open position, an excessive external force is not applied and the damper motors 43 do not press each other, and thus the load is not applied.

[Second Modification]
FIG. 8: is explanatory drawing which shows the closed state and open state of the damper which shows the 2nd modification of the combustion apparatus which concerns on embodiment of this invention.
Further, the predetermined position of the damper 42 is determined by the number of steps of the damper motor 43 from the position determined by the close sensor S1 and the open sensor S2 (position sensor) that detect the position of the damper 42, as shown in FIG. Preferably.

According to this configuration, the closing sensor S1 and the opening sensor S2 detect, for example, the damper 42 rotated by the damper motor 43 at a position 50 steps before the preset closing position and opening position of the damper 42. The damper motor 43 further rotates 50 steps and stops when it reaches a predetermined position which is an angle of 2° before the fully closed position or the fully opened position. In this way, the predetermined position where the damper 42 stops is detected by the number of steps of the damper motor 43 and the position detection signals of the closing sensor S1 and the opening sensor S2 (position sensor), so that it is reliably detected. For this reason, when the damper 42 is in the closed position state or the open position state, it is possible to more reliably eliminate an excessive external force applied to the damper motor 43.

[Third Modification]
Further, it is preferable that the damper 42 is attached to the drive shaft 44 that is rotationally driven by the damper motor 43 with play in the opening/closing direction.

According to this structure, the drive shaft 44 rotates when the damper 42 rotates to the fully closed position or the fully open position due to the play in the opening/closing direction in which the damper 42 is rotationally driven by the damper motor 43. Return by the amount of play in the direction opposite to the opening and closing direction. Therefore, the damper motor 43 does not receive an external force when the damper motor 43 is fully closed and fully opened, so that the life of the damper motor 43 can be extended. Further, since the damper 42 has a play in the opening/closing direction, even if there are dimensional variations and errors in various parts of the damper unit 40, the variations and errors are absorbed, and the torque is applied. Can be prevented.

[Other modifications]
Further, in the above-described embodiment, the combustion device 1 is described as an example in which the damper mechanism 4 (damper unit 40) is used, but any device that opens and closes the air passage 33 can be applied.

1 Combustion device 2 Burner part 3 Air supply device 4 Damper mechanism 21 Vaporization part 22 Combustion part 33 Air passage 40 Damper unit 41a Stopper (closer side stopper)
41b Stopper (Open side stopper)
42 damper 43 damper motor 44 drive shaft 45 support 211 vaporizer 232 flow pump S1 close sensor (position sensor)
S2 open sensor (position sensor)

Claims (6)

The burner section,
An air supply device for supplying air to the burner section,
An air passage communicating with the air supply device and the burner section;
A combustion device comprising: a damper mechanism provided in the air passage,
The damper mechanism is a damper that opens and closes the air passage,
A damper motor for driving the damper,
The damper has a fully open position that maximizes the cross-sectional area of the blower path at the position where the damper mechanism is provided by contacting the open-side stopper, and minimizes the cross-sectional area by contacting the close-side stopper. Be stopped at a predetermined position before the fully closed position,
Combustion device characterized by. The damper motor is configured to be de-energized when the damper stops at the predetermined position,
The combustion apparatus according to claim 1, wherein: The predetermined position of the damper is determined by the number of steps of the damper motor,
The combustion device according to claim 1 or 2, characterized in that. The predetermined position of the damper is determined by a position sensor that detects the position of the damper,
The combustion device according to claim 1 or 2, characterized in that. The predetermined position of the damper is determined by the number of steps of the damper motor from the position determined by a position sensor that detects the position of the damper,
The combustion device according to claim 1 or 2, characterized in that. The damper is attached to the drive shaft that is rotationally driven by the damper motor with play in the opening/closing direction,
The combustion device according to any one of claims 1 to 5, characterized in that.

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