JPH0413557Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a damper opening/closing device connected to a duct, and specifically relates to an improvement of a vane driving means in the damper opening/closing device.

[Prior Art] Conventionally, in this type of damper opening/closing device, a rotary shaft is supported inside a damper casing, a blade is attached to this rotary shaft, and a motor is driven as a means for rotating this rotary shaft. A device configured to transmit force to a rotating shaft via a link mechanism is known.

When a damper opening/closing device configured as described above is connected to an air conditioning duct in a building, for example, an air volume greater than a maximum air volume preset for each room must not be supplied into the room. Therefore, in order not to supply more than the maximum air volume, the opening of the blades should be adjusted to 0°, for example.
It is necessary to limit the angle to 60°. The maximum opening of the blades is set by adjusting the length and mounting position of the link mechanism rod. Of course, the opening degree of the blades can be set to any angle, for example 30° or 45°, depending on the appropriate air volume within the above range by driving the motor.

By the way, since such a damper opening/closing device uses a link mechanism, the structure becomes complicated, making it impossible to expect cost reduction, and adjusting the maximum opening of the blades becomes a complicated task. There were problems such as.

Therefore, recently, a damper opening/closing device has appeared that solves the above problems by directly connecting a motor and a rotating shaft via a speed reduction mechanism.

[Problems that the invention aims to solve] However, since a spur gear train was conventionally used as a reduction mechanism, when the pressure of the blown air in the duct was high, the opening of the blades could be set to, for example, 40°. However, there was a problem in that the blades would rotate even when the airflow was needed, and the blades would either close completely or open completely, sending out more air than necessary.

This idea is a means to rotate the rotation axis.
In a configuration where the motor is directly connected to the rotating shaft, the blades may rotate if the pressure of the blown air is large.
The problem is that it is not possible to maintain an appropriate air volume by fully closing or opening the valve.

[Means for Solving the Problems] The damper opening/closing device of this invention includes a damper casing connected between ducts, a rotation shaft rotatably supported inside the damper casing, and a rotation shaft rotatably supported inside the damper casing. It includes a blade that is attached to a rotating shaft to adjust the air volume in the duct, and a drive unit that rotates the rotating shaft to change the opening degree of the blade. The driving means includes a driving source, a worm gear driven by the driving source, a worm wheel meshing with the worm gear, and an output shaft attached to the worm wheel and rotating the rotating shaft. It has the following.

[Function] The blade can be set to a target opening degree by driving the drive source. Even if the wind pressure increases, since a worm gear and a worm wheel are used as one of the speed reduction mechanisms, rotation of the blades is prevented.

[Embodiment] FIGS. 1 to 3 show an embodiment of this invention, in which reference numeral 10 is a damper opening/closing device.

The damper opening/closing device 10 includes a rectangular cylindrical damper casing 11 that is connected between the ducts, a rotation shaft 12 that is rotatably supported inside the damper casing 11, and a rotation shaft 12 that is rotatably supported inside the damper casing 11. A vane 13 is attached to adjust the air volume in the duct, and a driving means 1 is attached to the outside of the damper casing 11.
It consists of 4. The drive means 14 includes a casing 15, a motor 16 housed in the casing 15, a reduction mechanism 18 connected to the motor 16 and consisting of a spur gear train, a shaft 20 of the reduction mechanism 18, and a shaft 20 of the reduction mechanism 18. It has a configuration including a worm 22 fixed to the shaft 20, a worm wheel 23 that meshes with the worm 22, and an output shaft 25 that transmits the rotation of the worm wheel 23 to the rotation axis 11 of the blade 13. There is.

A coupling ring 27 is attached to one end of the output shaft 25 (lower side in FIG. 2) for connecting the output shaft 25 and the rotating shaft 11.

At the other end of the output shaft 25 and outside the casing 15, there is a rotation angle of the output shaft 25, that is, a blade 13.
A pointer 28 is attached to display the rotation angle of the pointer 28. The output shaft 25 between the pointer 28 and the worm wheel 23 has an upper sleeve 30a and a lower sleeve 3.
0b is covered. The upper sleeve 30a is
It can be fixed to the output shaft 25 with a screw 31. A disc-shaped upper cam switch 32a is attached to this upper sleeve 30a. The lower sleeve 30b can be fixed to the output shaft 25 in the same manner as the upper sleeve 30a by a screw (not shown). A lower cam switch 32b similar to the upper cam switch 32a is attached to the lower sleeve 30b. These upper and lower cam switches 32a, 3
2b is provided with protrusions 32a1 and 32b1, respectively. Further, micro switches 36a and 36b are installed on the upper plate 35, and protrusions 32a1 and 32b of the upper and lower cam switches 32a and 32b are installed.
1 causes the motor 16 to stop driving.

Further, the tip end surface of the shaft 20 of the speed reduction mechanism 18 is exposed to the outside of the casing 15, and
A square hole 20a is formed.

According to the damper opening/closing device 10 as described above, by driving the motor 16, the rotation of the motor 16 is decelerated by the deceleration mechanism 18, further decelerated by the worm gear 22 and the worm wheel 23,
By rotating the rotating shaft 12 by a predetermined angle via the output shaft 25, the blades 13 can be set to a target opening degree. Furthermore, even if the wind pressure inside the duct increases, since the worm gear 22 and the worm wheel 23 are used as one of the deceleration mechanisms, rotation of the blades 13 is prevented, and an appropriate air volume is always maintained.
can be secured.

To set the maximum opening degree of the blade 13, first fit a hexagonal wrench into the hexagonal hole 20a and open the shaft 2.
Rotate 0. The rotation of the shaft 20 causes the output shaft 25 to rotate via the worm gear 22 and the worm wheel 23. After rotating the output shaft 25 to the maximum opening of the blade 13 while watching the pointer 28,
Loosen the screw 31, rotate the upper sleeve 30a,
The screw 31 is tightened at that position so that the protrusion 32a1 of the upper cam switch 32a hits the micro switch 36a and stops driving the motor 16.

On the other hand, in order to fully close the blade 13, the protrusion 32b1 of the lower cam switch 32b hits the micro switch 36b to stop the drive of the motor 16 when the blade 13 is fully closed, as described above. Note that the rotation angle α of the output shaft 25 at the fully closed state and at the maximum opening degree, that is, the maximum opening degree of the blade 13, can be arbitrarily set by the above-described procedure. In this way, the opening degree of the blade 13 can be arbitrarily set within the range from the maximum opening degree to the fully closed position, and the air volume can be adjusted. [Effects of the invention] This invention uses a worm gear and a worm wheel as one of the speed reduction mechanisms, so the blades can be set to any target opening degree by driving the drive source. In addition, even if the wind pressure inside the duct increases, it is possible to prevent the blades from rotating and maintain and ensure an appropriate amount of air at all times.

[Brief explanation of drawings]

Figures 1 to 3 show one embodiment of this invention, with Figure 1 showing the internal mechanism of the drive means and a view taken along the - line in Figure 2; A side view showing the mechanism; FIG. 3 is a schematic side view of the damper opening/closing device. 10... Damper opening/closing device, 11... Damper casing, 12... Rotating shaft, 13... Vane, 14...
... Drive means, 16 ... Motor, 22 ... Worm gear, 23 ... Worm wheel, 25 ... Output shaft.

Claims (1)

[Scope of utility model registration request] A damper casing connected between the ducts, a rotating shaft rotatably supported inside the damper casing, a blade attached to the rotating shaft to adjust the air volume in the duct, and a rotating shaft. A driving means for rotating a shaft to change the opening degree of the blade, the driving means comprising a driving source, a worm gear driven by the driving source, a worm wheel meshing with the worm gear, A damper opening/closing device comprising an output shaft attached to the worm wheel and rotating about the rotation shaft.