JP2529478Y2 - Variable air volume unit - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable air volume unit, and more particularly to a variable air volume unit for controlling an opening degree of a damper on the basis of an actual air volume calculated based on a wind speed and a required air volume.

[0002]

2. Description of the Related Art A conventional variable air volume unit 1 shown in FIG.
Includes a cylindrical casing 2, and inside the casing 2, a wind speed sensor 3 is provided on an air inlet side, and a damper 4 is provided on an air outlet side. A room temperature sensor 5 is provided in the room to be air-conditioned, and a controller 6 for receiving signals from the wind speed sensor 3 and the room temperature sensor 5 is provided at a predetermined location. The controller 6 is a room temperature sensor 5
The required air volume is calculated based on the signal from the
Then, the damper motor 7 is controlled so that the required air flow is equal to the actual air flow, and the opening degree of the damper 4 is thereby controlled. The actual air volume is calculated on the assumption that the wind speed sensor 3 detects the average wind speed.

[0003]

In the conventional variable air volume unit 1, when the straight duct 8 is connected to the air inlet of the casing 2, the wind speed sensor 3 in the air flow path is connected.
The velocity distribution (hereinafter, referred to as “wind velocity distribution”) of the airflow passing through the cross section including “” is, for example, as indicated by an arrow in FIG. Therefore, the wind speed sensor 3 detects the maximum wind speed passing through the surface, and the controller 6
The actual air volume required by the above is much larger than the true value. On the other hand, when the curved duct 9 is connected to the air inlet of the casing 2, the wind speed distribution is, for example, as shown in FIG.
1, the direction of the airflow does not match the direction of the center line A of the wind speed sensor 3, and the vortex generated immediately after the curved duct 9 affects the wind speed sensor 3. High wind speed cannot be detected.

That is, the conventional variable air volume unit 1 cannot detect an accurate average wind speed, and thus has a problem that the opening degree of the damper 4 cannot be appropriately controlled. Therefore, a main object of the present invention is to provide a variable air volume unit capable of more appropriately controlling the damper opening.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to a casing having an inlet connected to a main duct and an outlet connected to a room and having an air flow therein , the casing being provided in the casing.
Wind speed sensor and the wind speed sensor in the casing
Variable air flow unit with a damper installed downstream
A rectifying cylinder that rectifies air inside the casing.
A wind speed sensor is installed inside the rectifier cylinder,
This is a variable air volume unit characterized by providing a rectification network on the more upstream side .

[0006]

The rectifying cylinder provided so as to surround the wind speed sensor makes the direction of the airflow given to the wind speed sensor coincide with the direction of the center line of the wind speed sensor. In addition, the rectification network alleviates the vortex mixed in the airflow given to the wind speed sensor. Therefore, an accurate wind speed can be detected. By adjusting the linearity or pitch of the rectification network, the wind speed of the airflow given to the wind speed sensor can be made substantially equal to the average wind speed.

[0007]

According to the present invention, since the wind speed closer to the average wind speed can be detected, the opening degree of the damper can be more appropriately controlled. The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0008]

1 and 2, a variable air volume unit 10 of this embodiment includes a casing 16 having a substantially rectangular parallelepiped shape having an inlet 12 and an outlet 14. FIG. The entrance 12
The outlet 14 is connected to a damper 18 communicating with the main duct.
It is connected to a duct 20 leading to a room to be air-conditioned. Therefore, air flows inside the casing 16 from the inlet 12 to the outlet 14.

A wind speed sensor 22 for detecting a wind speed is provided inside the casing 16 on the upstream side, that is, near the inlet 12. As the wind speed sensor 22,
Any suitable type may be used, but in this embodiment, one utilizing Karman vortices is used. A rectifying cylinder 24 is provided so as to surround the wind speed sensor 22. The flow regulating cylinder 24 is arranged so that its side surface extends in parallel with the center line A of the wind speed sensor 22, and is supported inside the casing 16 by a support member 26 as shown in FIG. 2. A rectifying net 30 having a predetermined wire diameter and pitch is attached to the air inlet opening 28 of the rectifying cylinder 24. As the rectification net 30, a normal metal net, an expanded metal net, a plastic net, or the like can be used. In addition, the opening area of the rectification cylinder 24 (rectification network 30
Area) may be changed as appropriate, but it would be better if the circumference of the opening of the flow regulating cylinder 24 is about half the circumference of the opening of the casing 16.

The wind speed sensor 22 and the rectifying cylinder 24
A damper 32 for adjusting the amount of air blown into the room to be air-conditioned is provided downstream of. The damper 32 has a shaft 34
And is opened and closed by a damper motor 36 provided outside the casing 16. A room temperature sensor 38 for detecting the room temperature is provided in the room to be air-conditioned.

The wind speed sensor 22, damper motor 36 and room temperature sensor 38 are connected to an actual air volume calculation circuit 40, a motor control circuit 42 and a required air volume calculation circuit 44, respectively. These circuits 40 to 44 constitute a controller 46 and are housed in one case 48. The actual air volume calculation circuit 40 calculates the actual air volume based on the signal provided from the wind speed sensor 22, and the required air volume calculation circuit 44 calculates the required air volume based on the signal provided from the room temperature sensor 38. Then, the motor control circuit 42 controls the actual
The actual air volume calculated at 0 and the required air volume calculated by the required air volume calculation circuit 44 are compared, and the damper motor 36 is controlled and the opening of the damper 32 is adjusted so that the actual air volume and the required air volume become equal. . The actual air volume calculation circuit 40 calculates the actual air volume assuming that the wind speed sensor 22 detects the average wind speed.

According to this embodiment, since the speed of the airflow can be adjusted by the rectification network 30, the casing 1
When the straight duct 50 is connected to 6, for example, as shown by an arrow in FIG. 3, the wind speed distribution can be made substantially uniform. When the curved duct 52 is connected to the casing 16, for example, as shown by an arrow in FIG.
Can be made to coincide with the direction of the center line A of the wind speed sensor 22. Further, the rectification network 30 can mitigate the vortex generated immediately after the curved duct 52. Also in this case, the wind speed of the airflow given to the wind speed sensor 22 can be made substantially equal to the average wind speed by appropriately adjusting the wire diameter or the pitch of the rectification network 30.

That is, according to this embodiment, the wind speed closer to the average wind speed can be accurately detected, and the damper opening can be more appropriately controlled. The shapes of the casing 16 and the flow regulating cylinder 24 are not limited to the substantially rectangular parallelepiped shape as in the embodiment, but may be, for example, a cylindrical shape as shown in FIG. Further, a cylindrical rectifying cylinder 24 may be arranged inside a substantially rectangular parallelepiped casing 16 as shown in FIG. 6, or a substantially rectangular parallelepiped inside the cylindrical casing 16 as shown in FIG. Rectifying cylinder 24 with shape
May be arranged.

In the above-described embodiment, the rectification network 30 is provided at the upstream opening 28 of the rectification cylinder 24.
May be arranged so that the airflow passing therethrough is given to the wind speed sensor 22. Therefore, as shown in FIG. 8, the air flow may be arranged at the center of the rectifying cylinder 24, or at another appropriate position. It may be arranged.

[Brief description of the drawings]

FIG. 1 is an illustrative view showing one embodiment of the present invention;

FIG. 2 is a left side view of the embodiment of FIG.

FIG. 3 is an illustrative view showing a wind speed distribution when a straight duct is connected to the embodiment of FIG. 1;

FIG. 4 is an illustrative view showing a wind speed distribution when a bent duct is connected to the embodiment of FIG. 1;

FIG. 5 is an illustrative view showing a state in which a casing and a flow regulating cylinder are formed in a cylindrical shape;

FIG. 6 is an illustrative view showing a state in which a casing has a rectangular parallelepiped shape and a straightening cylinder has a cylindrical shape.

FIG. 7 is an illustrative view showing a state in which the casing has a cylindrical shape and the rectifying cylinder has a rectangular parallelepiped shape.

FIG. 8 is an illustrative view showing a state where a rectifying network is arranged at a central portion of a rectifying cylinder.

FIG. 9 is an illustrative view showing a conventional technique;

FIG. 10 is an illustrative view showing a wind velocity distribution when a straight duct is connected to the conventional technique of FIG. 9;

FIG. 11 is an illustrative view showing a wind speed distribution when a curved duct is connected to the conventional technique of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Variable air volume unit 16 ... Casing 22 ... Wind speed sensor 24 ... Rectifier cylinder 30 ... Rectifier net 32 ... Damper 36 ... Damper motor 38 ... Room temperature sensor 46 ... Controller 50, 52 ... Duct

Continued on the front page (72) Inventor Tadashi Suzuki 28 Hirade Industrial Park, Utsunomiya City, Tochigi Prefecture Inside the Tokugi Plant of Kubota Train Co., Ltd. JP, A) JP-B-59-42808 (JP, B2)

Claims (1)

(57) [Scope of request for utility model registration] 1. A casing having an inlet connected to a main duct and an outlet connected to a room and through which air flows, a wind speed sensor provided in the casing, and
Provided downstream of the wind speed sensor in the casing.
A variable air volume unit, comprising: a rectifying cylinder that rectifies the air in the casing;
The wind speed sensor is provided in the rectification cylinder, and is provided in front of the rectification cylinder.
A rectifier network is provided upstream of the wind speed sensor.
A variable air volume unit.