JPH0842499A - Flow straightening silencer device in air blasting and exhausting device - Google Patents

Abstract

PURPOSE:To realize a device having both a function of flow straightening for recovering static pressure and the function of a silencer, in a device for blasting and exhausting air by a blower. CONSTITUTION:This flow straightening silencer device in an air blasting and exhausting device is constituted so that stationary blades 1 having streamline shaped section are provided in an air blasting pipe, an air exhausting pipe, or in front and rear of moving blades 4 of a blower, and the stationary blade 1 is composed of a housing having many holes and sound absorbing material stuck on the inside of the housing. In addition, boss cylinder 2 having the stationary blades 1 fitted thereto can be also constituted so that the housing is formed out of a material having many holes and sound absorbing material is stuck on the inside of the housing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for blowing and exhausting air by a blower, such as a mine, a subway, an air conditioner, etc., which simultaneously performs rectification for static pressure recovery and silencing.

[0002]

2. Description of the Related Art For example, in a cooling tower or a heating tower of an air conditioner, a blower blows air to a heat exchange section. In this case, a guide vane is installed at the inlet of the blower blade, and a rectifying vane is installed at the outlet of the blower to recover the static pressure and improve the performance of the blower.

On the other hand, in order to reduce the noise generated by the blower, a muffler duct and a muffler splitter are installed at the inlet or the outlet of the blower to eliminate the noise of the blower.

[0004]

However, in the prior art, since the functions of rectification and muffling are different, they are separately performed, and therefore costs are incurred respectively.

Further, since the size of the muffling duct is often limited, in order to obtain a great muffling effect, a muffling splitter can be installed in the duct to improve the muffling performance. Since the pressure loss of the motor is large, the output of the motor must be increased to obtain the same performance.

The problem to be solved by the present invention is to reduce the cost by having the functions of rectification and noise reduction.

[0007]

In order to solve the above-mentioned problems, a rectifying and muffler device for a blower / exhaust device according to the present invention is a vane having a streamlined cross section in a blower pipe, in a blower pipe, or before and after a blower blade. In addition to the above, the stationary blade is configured by an outer cover having a large number of holes and a sound absorbing material attached to the inner side of the outer cover. Further, the boss cylinder to which the stationary blade is attached can also be one in which the outer cover is formed of a material having a large number of holes, and the sound absorbing material is attached inside the outer cover.

As the outer cover, punching metal, synthetic resin, glass fiber cloth, or net can be used.

[0009]

With the above-described means, the vane can perform both functions in a single structure, in addition to the conventional vane function, by adding a silencing function.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the embodiments shown in the drawings. FIG. 1 is a perspective view showing an embodiment of a sound deadening vane structure. As shown in FIGS. 2 (a) and 2 (b), both the vanes 1 and the boss cylinder 2 for fixing the same are punched on the outer jacket. Metal P Punching metal P
Stick glass wool G on the back side of. In order to prevent the generation of swirl, the vane 1 is streamlined and the rear end 3 of the boss cylinder 2 is conical.

As shown in FIG. 3, the stationary blade 1 is provided behind the moving blade 4.
When installed, in addition to performing the functions of rectifying and recovering static pressure like a normal vane, it has a sound absorbing structure and can mute sound. Moreover, by installing it just behind the moving blade 4,
Since the noise does not become the largest wake of the rotor blade, the silencing effect is the largest.

FIG. 4 shows a structure in which the vanes 1 and the duct 5 are compactly integrated, which not only rectifies and silences, but is also easy to install and has a cost advantage.

FIG. 5 shows an example in which the stationary blade 1 is provided in the elbow 6, and since the stationary blade 1 is provided at a place where air strikes, it plays a dual role of rectification and noise reduction. it can.

[Experimental Example] As shown in FIG. 3, the stationary blade 1 was installed behind the moving blade 4, and the static pressure recovery and noise reduction effect were measured. In addition,
The thickness of punching metal is 1 mm, the hole is 2.4 mmφ, the opening ratio is 21.715%, the duct inner diameter is 2800 m.
m, duct outer diameter 3000 mm, outer wall height 1500 mm
And the flow rate was 12 m / sec. Glass wool having a thickness of 20 to 50 mm was attached to the back surface of the punching metal.

The noise power levels with and without the stationary blades are shown below.

[Table 1]

As described above, as a result of the experiment, the static pressure recovery is 0.
The measured sound pressure level at 6 mmAq and 2.8 m from the blower outlet decreased from 74 dB (A) to 60 dB (A).

As the jacket, in addition to punching metal, synthetic resin having holes, glass fiber cloth, and net can be used.

[0018]

As described above, according to the present invention, the guide vanes and the flow straightening vanes of the blower are originally intended to recover the static pressure and improve the performance of the blower. By having it, it also becomes possible to muffle sound, and it is possible to suppress the noise generated in the moving blade from going outside. Also, because the two components of rectification and muffling are not provided separately,
The installation space can be reduced and only one installation work is required.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of an apparatus according to the present invention.

FIG. 2 is a partially cutaway perspective view showing a structure of a stationary blade and a boss cylinder.

FIG. 3 is a side view showing an example of installation of a noise reduction vane according to the present invention.

FIG. 4 is a cross-sectional view showing another installation example of the sound deadening vane according to the present invention.

FIG. 5 is a sectional view showing an example of installation on an elbow portion.

[Explanation of symbols]

1 stationary blade, 2 boss cylinder, 3 rear end, 4 moving blade, 5 duct, 6 elbow

Claims (2)

[Claims] 1. A stationary blade having a streamlined cross section is provided in a blower pipe or an exhaust pipe, or before and after a moving blade of a blower,
A rectifying and silencing device in a blower / exhaust device, characterized in that the stationary blade is composed of an outer cover having a large number of holes and a sound absorbing material attached to the inner side of the outer cover. 2. The blast and exhaust air according to claim 1, wherein the boss cylinder to which the stationary vane is attached also has an outer cover made of a material having a large number of holes, and a sound absorbing material is attached to the inner side of the outer cover. Rectification and muffler in equipment.