JP2544538B2 - Damper device - Google Patents

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 provided mainly in the middle of a ventilation system through which air for cooling and heating flows and which opens and closes the ventilation system and adjusts the ventilation amount.

[0002]

2. Description of the Related Art A conventional damper device of this type is disclosed in, for example, Japanese Patent Application Laid-Open Nos. 1-127850 and 2-1998.
The configuration is as disclosed in Japanese Patent No. 115650. That is, disc-shaped blades are provided in a cylindrical body made of sheet metal, and the blades are rotated by a motor or a rotary solenoid. The main body is connected to a duct forming a ventilation system and constitutes a part of the ventilation system. The blades are parallel to the air flow in the open state and are orthogonal to the air flow in the closed state to close the ventilation passage of the main body. A drive device such as a motor for moving the blades or a rotary solenoid is attached to the outside of the main body via an attachment member, and its output shaft is connected to the blades in the main body.

In the damper device having the above-mentioned structure, the blades are moved by energizing the driving device, and the ventilation system can be opened or closed. When the ventilation system is configured as, for example, a conveyance path for sending cooling air to each room, the damper device for the room requiring cooling is opened, and the damper device for the room not requiring cooling is closed. As a result, cooling can be performed for each room as needed.

[0004]

When a ventilation system for cooling including the damper device as described above is constructed, the ventilation system is arranged behind the ceiling of the building, and when cooling, the temperature is about 10 ° C. The cold air will flow. In the summer, the ceiling space, which is the installation environment, has a temperature of about 32 ° C. and is humid. Therefore, it is necessary to take measures against dew condensation in the ventilation system in the ceiling space, and the portion formed by the duct is covered with a heat insulating material, and the damper device is also covered with a heat insulating coating. However, the output shaft, which is exposed to cold air in the air passage, may even cool the motor part, causing unexpected condensation on the motor part, etc., which may wet the ceiling surface and become a burden on the motor. It was

The present invention has been made in order to solve such a conventional problem, and an object thereof is to obtain a damper device in which heat from the blade side is not conducted to the outside.

[0006]

SUMMARY OF THE INVENTION A damper device according to the present invention includes a blade shaft rotatably incorporated in a body forming an air passage having a circular cross section and a rotary shaft of a motor mounted outside the body. And a pair of resin joints are connected with a gap maintained between the shaft ends.

[0007]

In the damper device according to the present invention, the conduction of heat from the blade shaft to the rotating shaft of the motor is limited by the gap between the shafts and the pair of resin joints, and heat transfer to the outside is reduced. The load on the motor is reduced, and dew condensation on the rotating shaft can be prevented.

[0008]

1 is a vertical sectional side view of a damper device according to an embodiment of the present invention, and FIG. 2 is a front view showing the structure of a joint. The damper device of this embodiment is rotatable about a shaft 3 having an elliptical blade 2 mounted along a minor axis thereof in a cylindrical body 1 having open air ducts having circular cross-sections at both ends. Are supported by bearing members 4 and 5. Both ends of the body 1 are configured to be duct-connectable as connection openings, and a motor 7 is attached to the outer peripheral portion of the body 1 via attachment feet 6, and a shaft 3 of a blade 2 pivotally supported in the body 1 The rotating shaft 8 is connected so that torque can be transmitted. The blade 2 is formed in an elliptical shape similar to the shape of the cut surface when the air passage of the body 1 is obliquely cut, and the shaft 3 fixed on the minor axis thereof is made of a heat-defective conductor. Bearing members 4, 5 supporting the shaft 3 on the body 1
Are made of resin. Shaft 3 of blade 2 and motor 7
The rotary shaft 8 is connected to the outside of the body 1 by a pair of resin crank-type joints 9 connected by a pin 10 as shown in FIG. 2 so that a gap 11 is formed between the shaft ends. .

The damper device having the above-described structure is mounted near the outlet of each room of the cooling duct system or the heating duct system in the centralized heating and cooling system, and opens and closes the ventilation passage of the part as needed. Become. In this damper device, since the blade 2 is oval rather than circular, the amount of rotation from full opening to closing is small, and it is possible to finely adjust the ventilation amount by adjusting the amount of rotation.
The shape of the blade 2 also improves the shut-off property by itself. When the ventilation system for cooling including the damper device is configured as described above, the ventilation system is arranged behind the ceiling of the building, and the cooling air of about 10 ° C. flows during cooling. . At this time, the space above the ceiling is usually about 32 ° C. in the summer and is humid, but since the portion formed by the duct and the outer periphery of the body 1 are covered with a heat insulating material, there is almost no dew condensation in these portions. Particularly, in the damper device according to this embodiment, the occurrence of dew condensation on the motor 7 and its mounting portion, which is difficult to predict due to heat conduction from the blade 2 and the shaft 3 thereof, is suppressed, and the load on the motor 7 is reduced. That is, since the shaft 3 is less likely to transfer heat, has a gap 11 with the rotating shaft 8 and is connected via a pair of resin joints 9 that regulate heat conduction, the heat from the shaft 3 is transferred to the motor. Little is transmitted to the 7th side. Therefore, there is no problem that the ceiling surface gets wet due to dew condensation due to the heat from the shaft 3.

[0010]

As is apparent from the above description of the embodiments, according to the present invention, it is possible to prevent dew condensation on the motor portion or the like which is difficult to predict due to heat conduction from the blade and its shaft, and the heat load on the motor is reduced. Can also be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a damper device according to the present invention.

FIG. 2 is a front view of a joint of the damper device according to the present invention.

[Explanation of symbols]

 1 Body 2 Blade 3 Shaft 7 Motor 8 Rotating Shaft 9 Joint 11 Gap

Claims (1)

(57) [Claims] 1. A damper device for incorporating a blade into a body forming an air passage having a circular cross section, and rotating the blade by a motor to open and close the air passage of the body.
A damper device characterized in that a shaft is provided on the blade, and the shaft and the rotary shaft of the motor are connected to each other outside the body by a pair of resin joints with a gap between the shaft ends.