JPH0643258U - Silencer - Google Patents

Abstract

(57) [Abstract] [Purpose] Achieves both the noise reduction effect and the securing of compressor intake air volume. [Structure] In the muffler 1, an air passage 2 is formed by a cylindrical body 3 and a partition plate 4, and an outer cylinder 5 covers the outer periphery of the cylindrical body 3. The partition plate 4 is spirally and smoothly twisted by α degrees from the inlet side to the outlet side of the silencer 1. The cylindrical body 3 and the partition plate 4 are made of a sound absorbing material 7 whose surface is protected by a porous plate 6. The airflow flowing through the air passage is given a swirl, flows into the compressor, and the sound of the compressor transmitted through the air passage is absorbed and silenced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sound absorbing silencer provided at an intake port of a compressor.

[0002]

[Prior art]

 As such a conventional silencer, for example, there is one as shown in FIGS. 8 and 9 (for example, the basics of a gas turbine and the actual practice Mitsuko Miwa Naruyamado Shoten, March 18, 1989, Issue 146). See page).

That is, a sound absorbing material 102 such as glass wool whose surface is protected so as to be encased by a perforated plate 101 is installed in a duct 103 in a splitter shape, and an air passage is provided between the splitters. The sound absorbing material 102 is formed such that its front end is rounded and its rear end is sharpened to reduce ventilation resistance. A sound absorbing material 102 whose surface is protected by a porous plate 101 is also attached to the inner surface of the duct 103.

Then, the airborne sound is silenced while passing between the sound absorbing materials 102 arranged in a splitter shape.

[0005]

[Problems to be solved by the device]

 However, in such a conventional silencer, since the air passage has a configuration in which the sound absorbing material 102 is arranged in parallel in a splitter shape, the compressor discharge pressure is reduced by the pressure loss when the silencer is ventilated. However, there was a problem that the desired performance was not obtained.

The present invention has been made in view of such conventional problems, and an object thereof is to provide a muffler that achieves both a muffling effect and securing of a compressor intake air amount.

[0007]

[Means for Solving the Problems]

 Therefore, in the present invention, in the sound absorbing type silencer provided at the intake port of the compressor, at least a part of the intake passage is formed by a spiral sound absorbing material.

[0008]

[Action]

 Air-transmitted sound generated from the compressor is absorbed and silenced by the sound absorbing material while being transmitted through the air passage.

Further, since the air passage is formed in a spiral shape, the sucked air becomes a swirl flow by the air passage and flows into the compressor as a pre-swirl flow.

[0010]

【Example】

 Hereinafter, the present invention will be described with reference to the drawings. 1 to 4 are views showing an embodiment of the present invention.

First, the configuration will be described. The air passage 2 of the muffler 1 is formed by a cylindrical body 3 and a partition plate 4. Further, the outer cylinder 5 covers the outer circumference of the cylindrical body 3 to form the outer shape of the silencer. The partition plate 4 is spirally and smoothly twisted by α degrees from the inlet side 1a of the muffler 1 toward the outlet side 1b. That is, the state is twisted from the state of FIG. 2 which is the arrow A diagram of FIG. 1 to the state of FIG. 3 which is the B arrow diagram of FIG.

The cylindrical body 3 and the partition plate 4 are made of a sound absorbing material 7 such as glass wool whose surface is protected by a perforated plate 6 so as to absorb the sound transmitted through the air passage 2. .

As shown in FIG. 4, a duct 8 is attached to the outlet side 1 b of the silencer 1, and an intake port 10 of a compressor 9 is connected to a downstream side of the duct 1 by a flange 11. . In addition, 12 is a prime mover.

Next, the operation will be described. The air transmitted sound generated from the compressor 9 is absorbed by the sound absorbing material 7 while being transmitted through the air passage 2, and is silenced by the time it reaches the inlet side 1 a of the silencer 1. Here, since the partition plate 4 is twisted by α degrees from the inlet side 1a of the muffler 1 toward the outlet side 1b, the air passage 2 is twisted by α degrees. Therefore, it is difficult for the sound wave to go straight, and a greater sound absorbing effect can be obtained than with a silencer with a straight air passage.

Further, the air that is taken in from the inlet side 1a of the muffler 1 and flows to the outlet side 1b has the air passage 2 twisted by α degrees, so the air flowing out from the outlet side 1b has swung by α degrees. It has become a thing.

Therefore, as shown in FIG. 4, when the silencer 1 is attached to the intake port of the compressor 9, the intake air of the compressor 9 is in a state of being pre-swirled by α degrees. Therefore, if the pre-rotation direction is set to a direction in which the pressure ratio increases, the discharge pressure of the compressor 9 can be increased, and the pressure loss due to the mounting of the silencer 1 can be compensated for to obtain a predetermined discharge pressure.

5 to 7 show another embodiment of the present invention. In this embodiment, the partition plate 3 for partitioning the air passage 2 is arranged in a straight line from the inlet side 1a to the outlet side 1b of the muffler 1 in comparison with the above embodiment, and the air passage in the duct 8 is 13 is provided with a twisted spiral plate 14 from its inlet side 8a to its outlet side 8b. In this embodiment, the sound absorbing material 7 is also attached to the spiral plate 14 to enhance the sound absorbing effect.

Also in this embodiment, the air-transmitted sound generated from the compressor is absorbed by the sound absorbing material 7 while being transmitted through the air passage 2, and is silenced by the time it reaches the inlet side 1a. At that time, in the present embodiment, the sound wave travels straight in the air passage 2, but the sound absorbing effect is practically sufficient.

Further, the spiral plate 13 provided in the duct 8 imparts a pre-swirl to the air flow and introduces it to the compressor. Therefore, in the present embodiment, as compared with the case without the pre-swirl. The compressor has a high pressure ratio performance and can obtain a predetermined discharge pressure.

Further, in this embodiment, since the spiral plate that gives the pre-turning is provided in the duct, the structure of the air passage is simplified and the cost can be reduced.

[0021]

[Effect of device]

 Since the present invention is configured as described above, according to the present invention, even if a silencer is provided, the compressor can obtain a predetermined performance without lowering the discharge pressure of the compressor. can get.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a view on arrow A in FIG.

FIG. 3 is a view on arrow B of FIG.

FIG. 4 is a partial cross-sectional side view showing a state in which the muffler of one embodiment of the present invention is attached to a compressor.

FIG. 5 is a side view showing another embodiment of the present invention.

FIG. 6 is a view on arrow C of FIG.

FIG. 7 is a view on arrow E of FIG.

FIG. 8 is a side sectional view showing a conventional example.

FIG. 9 is a front view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Silencer 2 ... Air passage 3 ... Cylindrical body 4 ... Partition plate 5 ... Outer cylinder 6 ... Perforated plate 7 ... Sound absorbing material 8 ... Duct 13 ... Duct air passage 14 ... Spiral plate

Claims (1)

[Scope of utility model registration request] 1. A sound absorbing silencer provided at an intake port of a compressor, wherein at least a part of an intake passage is formed of a spiral sound absorbing material.