JPH0424412A - Combustion air control device - Google Patents

Abstract

PURPOSE:To stabilize a rotation reference position of a damper and control the amount of air with accuracy by installing a stopper, which provides a reference position to the damper when it rotates, to at least two positions on their opposite side, centering on the rotary axis of the damper. CONSTITUTION:When starting up operation, a stepping motor is rotated so that a damper 16 may come into contact with a stopper 19 where this contact position is set to a rotation reference position of the damper 16. When the damper 16 is located at this position, it is set that the amount of combustion air passing through the damper should be a minimum one or the amount of air required for weak combustion. A stopper 19 is installed at two positions. They are installed so that they may virtually face each other, centering on a rotation axis 16c of the damper 16. The damper 16 is forced to receive torque with the two stoppers 19, centering on the rotation axis 16c, which prevents the rotation axis 16c from being inclined. As a result, the damper 16 can be set at the reference position with accuracy, which makes it possible to keep accurate the rotation position of the damper 16 at each combustion amount in the following steps.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to combustion air conditioning devices such as oil fan heaters.

2. Description of the Related Art In general, in a combustion apparatus that uses oil, gas, etc. as fuel and has a predetermined combustion range from weak combustion to strong combustion, a highly accurate combustion air adjustment device is required to perform normal weak combustion. A conventional combustion air conditioning device will be explained below. In FIGS. 5 and 6, 1 is a duct provided in the combustion air passage, 2 is a damper provided in the duct 1, 3 is a stepping motor that drives this damper 2, and 4 is a controller that controls the rotation of the stepping motor 3. It is controlled by a control unit according to a predetermined program. Reference numeral 5 denotes a stopper for determining the reference rotation position of the damper 2, which is provided with four ducts as shown in FIG. The rotation reference position of the damper 2 is determined by hitting the end face.

Problems to be Solved by the Invention However, in the conventional configuration described above, the rotation reference position of the damper 2, that is, the position of the damper 2 corresponding to the weak combustion is the position where the stepping motor 3 abuts the stopper 5, and in this case, the stopper 5 Since there is only one location, the torque generated by the stepping motor 3 and the stopper 5 tilts the redamper rotating shaft 2b. As a result, the rotational reference position of the damper 2 is not stabilized and the rotational phases of the dampers corresponding to all combustions are not determined at one point, creating a risk that this combustion device will cause unsafe combustion. In addition, as shown in Fig. 4, in the relationship between the damper rotation phase and the amount of combustion air, the air 'lA at the time of weak combustion does not match the ideal combustion air amount B at the time of weak combustion, which is originally required. The combustion width becomes narrower.

The present invention solves these problems and aims to enable accurate air LtyJ clauses.

Means for Solving the Problems In order to achieve the above object, the present invention includes a duct provided in a combustion air passage to a burner, a damper provided in the duct, and a stepping motor for rotating the damper.
The damper is provided with a control unit that controls a stepping motor, and a stopper that provides a reference position when the damper rotates, and the stoppers are provided at at least two locations so as to be substantially opposed to each other with the rotation axis of the damper as the center. .

Effect of the present invention With the above configuration, the damper rotation axis is prevented from tilting due to the torque generated by the stepping motor and the stopper, the rotation reference position of the damper is stabilized, and the rotation phase of the damper corresponding to all combustions is determined at one point. , the risk of the combustion device causing unsafe combustion is eliminated, and in the relationship between the damper rotation phase and the combustion air amount as shown in Fig. 4, the air amount A during weak combustion is reduced to the originally necessary weak When the combustion air amount B matches the ideal combustion air amount B.

Embodiment Below, one embodiment of the present invention will be explained using FIGS. 1 to 3. Reference numeral 11 is a burner, and 12 is a fan that supplies combustion air to the burner 11 through a combustion air passage 13. It is connected to the burner 11. 14 is a pump that supplies fuel to the burner 11.

A combustion air conditioning device is provided in the middle of the combustion air passage 13, 15 is a duct thereof, 16 is a damper rotatably provided in the duct 15, and has a predetermined clearance between it and the duct 15. , and has an opening 16a in the side wall, and the opening area increases or decreases by rotating the cylindrical shape. 17 is a stepping motor that rotates the damper 16; 18 is a control unit that controls the stepping motor 17;
It is designed to drive 7.

19 is a stopper provided on the duct 115a of the duct eye 5, which determines the rotation reference position of the damper 16;
It moves within a groove 16b formed on the upper surface of the damper. That is, at the start of operation, the stepping motor 17 is rotated by a signal from the control section 18, and the damper 16 is rotated.
is applied to the stopper 19, and this position is set as the reference rotation position of the damper 16, and the amount of combustion air passing through the duct 15 when the damper 16 is at this reference position is the amount of air required for weak combustion, that is, the minimum amount of air. Thereafter, the amount of combustion air is adjusted by the rotation of the damper 16 from the reference position, that is, the rotation angle of the stepping motor 17.

Here, the stopper 19 is provided at two locations as is clear from FIG.
They are located at positions that are almost opposite to each other with the center at the center.

Therefore, according to the above configuration, when the damper 16 is rotated to the rotation reference position by the stamping motor 17, the damper 16 is moved to the stopper 19 at the center of the rotating shaft 16c.
, the rotation shaft 16 of the damper 16
c will no longer peel off.

As a result, the reference position of the damper 1G is accurately determined each time, and the rotational position of the damper 16 at each subsequent combustion amount is also accurate.

Effects of the Invention As described above, according to the combustion air adjustment device of the present invention, the rotational reference position of the damper that adjusts the amount of combustion air can be stabilized, and the rotational position of the damper can be maintained at a predetermined position in all combustion zones. Safety can be ensured because it is determined by the position. Also,
The amount of air during weak combustion matches the ideal amount of combustion air that is originally required, and the width of combustion during weak combustion can be widened.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a combustion air conditioning device according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main parts, Fig. 3 is a partially cutaway perspective view of the same, and Fig. 4 is the rotational phase of the damper. FIG. 5 is a cross-sectional view of a conventional combustion air conditioning device, and FIG. 6 is a partially cutaway perspective view of the same. 11... Burner, 13... Combustion air passage, 15... Duct, 16... Damper, 16c... Rotating shaft, 17... ...Stepping motor, 18...Control unit, 19...
...Name of stopper agent: Patent attorney Shigetaka Awano (1 person)

Claims (1)

[Claims] A duct provided in the combustion air passage to the burner, a damper provided within the duct, a stepping motor that rotates the damper, a control unit that controls the stepping motor, and a reference point when the damper rotates. and a stopper that determines the position of the damper, the stoppers being provided at at least two locations so as to be substantially opposed to each other about the rotation axis of the damper.