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A muffler and sound wave technology, which is applied in the directions of sound-producing equipment, instruments, and muffler devices, can solve the problems of reduced muffling effect and high sound pressure, and achieve the effect of suppressing resonance and improving muffling effect.

Active Publication Date: 2020-02-18
코벨코컴프레서가부시키가이샤
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the muffler disclosed in Patent Document 1, resonance occurs on the surface facing the direction in which the fluid is discharged from the expansion chamber.
Therefore, the sound pressure near the outlet becomes higher and the noise reduction effect decreases

Method used

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Experimental program
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Effect test

no. 1 approach

[0044] figure 1 It is a schematic diagram showing a part of the device (screw compressor) to which the muffler 2 of the first embodiment is applied. The muffler 2 is incorporated in a flow path that overlaps with the flow of fluid and transmits sound waves. In this embodiment, the muffler 2 is arranged in the discharge flow path 6 of the screw compressor main body 4 in order to silence the sound generated by the flow of compressed air as a fluid.

[0045] refer to figure 2 The structure of the muffler 2 of the first embodiment will be described.

[0046] figure 2 It is a schematic longitudinal sectional view showing the muffler 2 of the first embodiment. like figure 2 As shown, the muffler main body (housing) 8 of the muffler 2 is formed in a cylindrical shape centered on the axis P so that compressed air (fluid) can circulate inside. The muffler main body 8 has a side wall 9 forming a cylindrical side surface. The upstream side end of the side wall 9 is closed by a c...

no. 2 approach

[0073] Image 6 It is a schematic longitudinal cross-sectional view showing the muffler 2 of the second embodiment. The structure of the muffler 2 of this embodiment other than the part related to the end portion of the introduction attenuation part 10 is the same as figure 2 The same as the first embodiment. Therefore, for figure 1 The same reference numerals are assigned to the same components in the shown configurations, and description thereof will be omitted.

[0074] like Image 6 As shown, in the muffler 2 of the second embodiment, a concave portion (non-flat portion) 62 and a flat surface 30 are formed at the end in the direction of the axis P of the expansion chamber 26 introduced into the damper 10 . The recess 62 is constituted by a circular hole 64 penetrating through the muffler main body 8 and a closing plate 66 closing the hole 64 . Therefore, the end portion of the introduction damper 10 in the direction of the axis P does not have the plug portion 28 lik...

no. 3 approach

[0080] Figure 9 It is a schematic longitudinal sectional view showing the muffler 2 of the third embodiment. The structure of the muffler 2 of this embodiment other than the part related to the end portion of the introduction attenuation part 10 is the same as figure 2 The same as the first embodiment. Therefore, for figure 1 The same reference numerals are assigned to the same components in the shown configurations, and description thereof will be omitted.

[0081] like Figure 9 As shown, the muffler 2 of the third embodiment has a convex portion (non-flat portion) 32 and a concave portion (non-flat portion) 62 in the introduction attenuation portion 10 . The recess 62 is constituted by a circular hole 64 penetrating through the muffler main body 8 and a closing plate 66 closing the hole 64 . Therefore, the end portion of the introduction attenuation portion 10 does not have the plug portion 28 like the first embodiment, but has the opening portion 68 opened through t...

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Abstract

The invention provides a muffler. The muffler (2) has an introduction attenuation portion (10). The introduction attenuation unit (10) includes an introduction unit (24) for introducing a fluid, an expansion chamber (26), and a delivery unit (16). The expansion chamber (26) communicates with the introduction part (24), has a flow passage section larger than that of the introduction part (24), and has a convex part (32 ). The outlet part (16) communicates with the expansion chamber (26), has a flow path cross section smaller than that of the expansion chamber (26), and leads the fluid in a direction different from the direction in which the fluid is introduced. Therefore, the resonance of the sound wave is weakened, the increase of the internal sound pressure of the muffler (2) is suppressed, and the reduction of the noise reduction effect is prevented.

Description

technical field [0001] The invention relates to a muffler. Background technique [0002] It is known that larger sound waves are generated in the outlet space of the compressor. Being able to attenuate these sound waves is useful for various reasons. [0003] For example, Patent Document 1 discloses a muffler having such a function of attenuating sound waves. [0004] The muffler of Patent Document 1 includes an inlet pipe, a discharge pipe, and an expansion chamber communicating with them. In this muffler, a sudden change in impedance occurs due to changes in cross-sections of the introduction pipe, expansion chamber, and discharge pipe, and sound waves are reflected at their boundaries, thereby exerting a noise reduction effect. [0005] However, in the muffler disclosed in Patent Document 1, resonance occurs on the surface facing the direction in which the fluid is discharged from the expansion chamber. Therefore, the sound pressure in the vicinity of the outlet becom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N1/02F01N1/08
CPCF04C18/16F04C29/065F04C29/12G10K11/161G10K11/172F01N1/02F01N1/08
Inventor 菊池政宽次桥一树福岛洋辅平田和也木内优
Owner 코벨코컴프레서가부시키가이샤
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