JPH0371616B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a blower equipped with a damper whose air volume can be adjusted in a ventilation system, etc., and particularly to a blower damper in a continuous ventilation system such as a train. This relates to something that reduces noise.

[Prior art]

An example of a conventional blower equipped with a damper is shown in FIG. In the figure, 1 is an impeller provided in a casing 2, 3 is a suction duct connected to the suction side of the impeller 1, 4 is a connection duct that connects the discharge side of the impeller 1 and the discharge silencer 5, and 6 is a suction duct connected to the suction side of the impeller 1. is a motor provided in the discharge silencer 5 and driving the impeller 1;
7 is a rectifying plate that rectifies the flow from the connecting duct 4;
8 is a suction silencer connected to the upstream side of the suction duct 3, and 9 is a sound absorbing material pasted on the inner surfaces of the suction silencer 8 and the discharge silencer 5. A slide damper 10 is installed at the outlet of the discharge silencer 5, and the required ventilation air volume is adjusted by sliding the valve body 10a of this damper 10.

[Problem to be solved by the invention]

In the conventional device configured in this way, the current plate 7
was provided in the discharge silencer 5, so the damper 10 for adjusting the ventilation air volume was provided at the outlet of the discharge silencer 7 due to the installation space. For this reason, when the airflow discharged from the impeller 1 passes through the valve body 10a of the damper 10 during operation of the ventilation system, a unique wind noise is generated, and this sound is propagated directly to the outside air, resulting in a large amount of noise. It had the disadvantage of becoming. In addition, since the damper 10 has a structure in which the opening degree is adjusted by sliding the valve body 10a and is fixed at that opening state with bolts, there is also the disadvantage that adjusting the opening degree of the damper 10 is troublesome. It was hot.

FIG. 2 is a diagram illustrating the flow inside the discharge silencer 5 of the blower shown in FIG. 1. Since the flow from the connecting duct 4 flows along the outer wall side 4a of the duct 4, the arrow 11a at the inlet of the discharge silencer 5
As shown in the figure, the flow is biased toward the lower half. Therefore, the flow is rectified by the rectifying plate 7, and the motor 6 is cooled as an averaged flow as shown by the arrow 11b. As described above, the conventional type requires the current plate 7 and also has the disadvantage that the pressure loss caused by the current plate 7 is large.

An object of the present invention is to improve the above-mentioned conventional drawbacks and provide a blower equipped with a low-noise damper that can absorb wind noise generated from the damper of the blower inside the silencer.

[Means to solve the problem]

In order to achieve the above object, the present invention includes an impeller provided in a casing, a motor that drives the impeller, a suction duct connected to the suction side of the impeller, a discharge side of the impeller, and a discharge silencer. In the blower, the motor is provided within the discharge silencer, and a butterfly damper is provided at the inlet of the discharge silencer.

[Effect]

With the above configuration, wind noise generated when passing through the butterfly damper is absorbed inside the silencer before flowing out to the outside of the discharge silencer.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. In the figures, parts with the same reference numerals as in FIGS. 1 and 2 are the same parts.

In this embodiment, a butterfly damper 12 is provided at the inlet of the discharge silencer 5. Furthermore, as shown in the figure, the direction of inclination of the valve body 12a of this butterfly damper 12 is selected so that the flow from the connecting duct 4 flows equally to the parts of the bearing 13 that support both ends of the motor shaft 6a. There is.

With the above configuration, the air flow in the blower of the present invention is as follows. When the impeller 1 is driven by the motor 6, air is sucked in from the suction silencer 8 as shown by an arrow 14a, flows as shown by arrows 14b and 14c, and is driven by the impeller 1.
The pressure of the air is increased, and it flows into the discharge silencer 5 through the connection duct 4. A butterfly damper 11 installed at the inlet of the discharge silencer 5 (on the upstream side of the motor) allows the airflow to pass through the outer periphery of the motor 6 inside the discharge silencer, which is adjusted to the required ventilation amount, as shown by an arrow 14d, and then as shown by an arrow 14e. leaks to the outside.

The wind noise generated when passing through the valve plate 12a of the butterfly damper 12 is effectively absorbed by the sound absorbing material 9 inside the silencer before it flows out of the discharge silencer 5, resulting in a low-noise blower. be able to. The butterfly damper 12 is connected to the valve plate 1
2a, an arm, a guide (not shown), etc., and the opening degree can be adjusted extremely easily by rotating the valve plate shaft. According to the present invention, as shown in FIG. 4, the flow from the connecting duct 4 is directed by the arrow 1 in the figure by the valve plate 12a of the butterfly damper 12 at the inlet of the discharge silencer 5.
The flow is rectified as shown by 5a, and flows around the outer circumference of the motor 6 inside the silencer 5 with a flow distribution as shown by the arrow 15b. Even in the motor 6, the portion of the bearing 13 that supports both ends of the motor shaft 6a generates a large amount of heat, but in the present invention, since a particularly large amount of air flows through the portion of the bearing 13, the bearing 13, which is an important component, can be effectively used. It also has the effect of cooling.

In the above embodiment, the butterfly type damper is provided at the inlet of the discharge silencer, but even if the butterfly type damper is provided upstream of the discharge silencer, for example, in the suction silencer, the damper will still generate air. Wind noise can be absorbed in the suction silencer or the discharge silencer.

〔Effect of the invention〕

As explained above, according to the blower equipped with the damper of the present invention, since the butterfly type damper is provided at the inlet of the discharge silencer, wind noise is generated when the airflow passes through the damper blades of the blower. can be absorbed inside the silencer, resulting in a significant noise reduction effect.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a blower equipped with a conventional damper, FIG. 2 is a cross-sectional view showing only the discharge silencer part in FIG. 1 in an enlarged manner, and FIG. A vertical cross-sectional view showing an example,
FIG. 4 is an enlarged sectional view showing only the discharge silencer portion in FIG. 3. 1... Impeller, 2... Casing, 3... Suction duct, 4... Connection duct, 5... Discharge silencer, 6... Motor, 6a... Motor shaft, 12...
Butterfly damper, 12a... Valve body, 13...
bearing.

Claims (1)

[Claims] 1. An impeller provided in a casing, a motor that drives the impeller, a suction duct connected to the suction side of the impeller, and a discharge silencer connected to the discharge side of the impeller. What is claimed is: 1. A blower equipped with a damper, characterized in that the motor is provided within the discharge silencer, and a butterfly damper is provided at an inlet of the discharge silencer. 2. The inclination direction of the valve body of the butterfly damper is selected so that the flow from the connecting duct flows equally to each of the bearing parts supporting both ends of the motor shaft. Blower with damper.