JPH0566050A - Damper device - Google Patents

Abstract

PURPOSE:To enhance stability of a switching operation by reducing a pressure loss. CONSTITUTION:A supporting shaft 9, in which a coil spring 13 is so elastically mounted as to slide in a centerline direction in a cylinder, is supported by a bearing 6 held by a supporting leg 4 to the center of an opening at one end side of the cylinder 1. A blade 10 for closing the opening at one end side of the cylinder 1 is fixed to one end of the shaft 9, and the shaft 9 is slid against the energization of the spring 13 through a coupling wire 16 by a geared motor 2 provided out of a vent passage of the cylinder 1. The blade 10 is separated from the opening of the cylinder 1, the shaft 9 from the end side of a blade mounting side to the vicinity of the rear end from the leg 4 is supported by the bearing 6, and the rear end of the part for supporting the shaft 9 near the rear end from the leg 4 is formed in a tapered part 6c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper device which is attached to a ventilation passage and opens and closes the ventilation passage as needed.

[0002]

2. Description of the Related Art For example, a damper device which is linked to a ventilation fan has a blade for opening and closing a ventilation passage.
Many are designed to be moved by a rotary solenoid as seen in Japanese Patent Publication No. 750. The structure disclosed in the above publication has a structure in which a blade is provided in a tubular main body forming an air passage, and a shaft integral with the blade is rotated by a rotary solenoid. The output shaft of the rotary solenoid and the shaft of the blade are connected by a gear and are arranged in the air passage of the main body together with the rotary solenoid.

In the damper device having the above-mentioned structure, the ventilation passage is opened by making the blade parallel to the direction of the air flow by the rotary solenoid, and the ventilation passage is closed by making the blade perpendicular to the direction of the air flow. be able to.

[0004]

In the damper device as described above, since the rotary solenoid and the power transmission system are in the ventilation passage and the parts are relatively large, the pressure loss is high and the parts themselves are dirty. easy. In addition, since the blades rotate in the air passage, it is necessary to maintain smooth movement of the blades, and therefore there is a problem to be solved such that a gap is likely to be formed between the inner peripheral surface of the main body and the outer peripheral portion of the blade even in the closed state. There is.

The present invention has been made in order to solve such a conventional problem, and an object thereof is to obtain a damper device having a low pressure loss, a good closing property, and a high stability in opening / closing operation.

[0006]

In the damper device according to the present invention, a bearing held by a support leg at the center of the opening on one end side of the cylinder forming the air passage slides in the cylinder in the direction of the center line. A support shaft is movably supported, and one end of this support shaft is fixed with a blade that closes the opening on the one end side of the tubular body, and the support shaft is biased by an elastic member in the direction in which the blade closes. The support shaft is slid against the bias of the elastic member through the connecting cable by the drive motor provided outside the ventilation path formed by the cylinder, and the blade is separated from the opening of the cylinder to open the opening. It is configured to open, especially the above bearing is not configured to support the support shaft from the tip side of the blade mounting side to the rear end of the support leg, and supports the support shaft near the rear end of the support leg. The rear end of the portion to be tapered is tapered.

[0007]

In the damper device according to the present invention, the support shaft supported in the center line direction inside the cylinder forming the ventilation passage by the drive motor provided outside the cylinder forming the ventilation passage is connected via the connecting cable. By sliding, the blade closed by the bias of the elastic member that biases the support shaft can be separated from the opening in the direction of the center line to open the opening. Since the holding portion is long and the end portion on the elastic member side is tapered and the elastic member is not caught, the support shaft can smoothly reciprocate linearly without vibration. In addition, since the support shaft and the elastic member are only interposed in the ventilation passage in the cylinder, the pressure loss is reduced and the drive motor is also less likely to get dirty.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS All the figures show one embodiment of the present invention. The damper device of the present example, whose cross-sectional view is shown in FIG. 1 and whose front view is shown in FIG. 2, is constructed by assembling an opening / closing member for opening and closing the air passage to a cylindrical tubular body 1 forming a straight air passage. A geared motor 2 for driving the opening / closing member is provided outside the ventilation path. On one end side of the cylindrical body 1, a flange 3 is provided, in which a part (upper part in the illustrated example) of the protrusion is formed large. The flange 3 is provided with a T-shaped support leg 4 including a portion that crosses the diameter line of the opening of the tubular body 1 and a portion that extends downward from the central portion. The support leg 4 is integrally formed with a reinforcing flow straightening vane 5 by bending the edge of the support leg 4 forward. The reinforcing straightening vanes 5 function as a channel type or an angle type with high strength for the supporting legs 4, and at the same time, fulfill the function of straightening the airflow passing through the portions. A bearing 6 is mounted on the center line of the tubular body 1 of the support leg 4, and a tubular case 7 having one end closed to enclose the bearing 6 is provided in the tubular body 1.
Is fixed to the support leg 4 with the closed end facing the rear end (right end in FIG. 1) of the tubular body 1 on the center line.

As shown in FIGS. 4 and 5, the bearing 6 has a journal portion 6b extending long on both sides of a mounting portion 6a for the supporting leg 4, and one end surface of the journal portion 6b is formed into a tapered taper portion 6c. Has been done. An opening flange 8 having an opening wider than the opening of the cylinder 1 is attached to the front side of the flange 3 of the cylinder 1.
The bearing 6 is attached so that the tapered portion 6c faces rearward, the bearing 6 is supported by the bearing 6 in the case 7, and the support shaft 9 which can slide on the center line of the case 7 is inserted. A round plate-shaped blade 10 is fixed to the tip of the support shaft 9 at the periphery of the opening of the opening flange 8 and can seal the opening like a lid. The front journal portion 6b of the bearing 6 projects to a length such that the support shaft 9 is not exposed when the blade 10 seals the opening.

At the end of the support shaft 9 inside the case 7, a mounting plate 11 is attached by a nut 12 so as not to come off. A coil spring 13 as an elastic member is interposed between the mounting plate 11 and the mounting portion 6a of the bearing 6, and the support shaft 9
The blade 10 is pushed back by the spring force of the coil spring 13 to a position where it closes the opening of the opening flange 8. Further, a pair of opposing guide plates 14 extending in parallel to the center line near the mounting plate 11 mounted on the support shaft 9 in the case 7 are cantileveredly attached to the support leg 4. The guide plate 14 restricts the rotation of the mounting plate 11 and the rotation of the blade 10 together with the support shaft 9 thereof.

The geared motor 2 is attached together with a cover 2a for covering the charging portion on the upper side where the flange 3 is enlarged. A motor pulley 15 is attached to an output shaft of the geared motor 2, and the motor pulley 15 and an upper portion of a mounting plate 11 mounted on the support shaft 9 are connected by a connecting wire 16. The connecting wire 16 is hooked on a pulley 18 which is axially supported by a pulley support fitting 17 fixed to the support leg 4 and is turned by approximately 90 degrees. The pulley support fitting 17 is fixed to a portion that crosses the diameter line of the support leg 4 and a portion that extends vertically downward from the central portion,
A wire guard 19 is attached to prevent the connecting wire 16 from coming off.

The damper device having the above-mentioned structure is attached to, for example, an air supply duct so as to interlock with a ventilation fan. That is, when the ventilation fan is turned on, the damper device is also energized, the geared motor 2 rotates, and the connecting wire 16 is wound up. Support shaft 9 together with winding of connecting wire 16
Is pulled forward against the bias of the coil spring 13, and the blade 10 fixed to the end of the support shaft 9 is opened by the opening flange 8.
Is separated from the opening in the direction of the center line to open the opening. When the blades 10 are opened, the rotation of the geared motor 2 is stopped, but the energization of the clutch coil in the geared motor 2 is continued, so that the opened state of the blades 10 is maintained. When the ventilation fan is turned off, the energization of the damper device is also turned off, the elastic return force of the coil spring 13 pulls back the support shaft 9, and the blades 10 are initially closed. In this damper device, since the blade 10 moves linearly to open and close, there is no gap in the closed state, and the closing performance is good. Further, since there is no main part of the drive system in the air passage, pressure loss is small and malfunctions due to adhesion of dirt to the main parts are reduced. Further, since the bearing 6 supports the support shaft 9 over a wide range, the support shaft 9 slides smoothly and vibrations are eliminated. Although the coil spring 13 expands and contracts, it does not catch on the bearing 6 during expansion and contraction, and the smooth movement of the support shaft 9 is guaranteed.

[0013]

As is apparent from the above description of the embodiments, according to the present invention, the holding portion of the support shaft by the bearing is long, and the end of the bearing on the elastic member side is tapered so that the elastic member expands and contracts. Since there is no catch at the time, the support shaft can smoothly move back and forth in a straight line without vibration, which improves the opening / closing performance. Further, since the support shaft and the elastic member are only interposed in the air passage, the pressure loss is reduced and the drive motor is less likely to be contaminated.

[Brief description of drawings]

FIG. 1 is a sectional view of a damper device showing an embodiment of the present invention.

FIG. 2 is a front view of a damper device showing an embodiment of the present invention.

FIG. 3 is a front view of an opening portion of a flange showing an embodiment of the present invention.

FIG. 4 is a front view of a bearing showing an embodiment of the present invention.

FIG. 5 is a sectional view of a bearing showing an embodiment of the present invention.

[Explanation of symbols]

 1 Cylindrical body 2 Geared motor 4 Support leg 6 Bearing 6c Tapered portion 9 Support shaft 10 Blade 13 Coil spring 16 Connecting wire

Claims (1)

[Claims] 1. A bearing held by a support leg at the center of an opening on one end side of a tubular body forming an air passage, supported by this bearing, and housed so as to be slidable in the direction of the center line in the tubular body. A support shaft, a blade fixed to one end of the support shaft to close the opening on the one end side of the tubular body, an elastic member for urging the support shaft in the direction in which the blade closes, and a ventilation formed by the tubular body. A drive motor provided outside the path, a connecting line connecting the drive motor and the support shaft, a pulley for hanging the connecting line and changing the direction of the connecting line, and connecting the line by the rotation of the drive motor. The support shaft is slid against the biasing force of the elastic member via, and the blade is separated from the opening of the tubular body to open the opening. Support shaft from the tip side of the blade mounting side to the rear end of the support leg A damper device, characterized in that the rear end of a portion supporting a support shaft closer to the rear end than the supporting leg is tapered.