JPH02191900A - Silencer device for blower - Google Patents

Abstract

PURPOSE:To prevent a sound absorbing material from wearing a deformation by connecting a pipe-shaped case to a ventilation port, mounting the pipe-shaped sound absorbing material of heat resisting fiber into this case and providing in the internal periphery of the sound absorbing material a cylindrical unit having a mesh-shaped opening and formed by a metal plate or the like, in the case of a silencer device for a blower conveying gas of high temperature. CONSTITUTION:A silencer device 9 is formed by mounting a pipe-shaped sound absorbing material 4, consisting of heat resisting fiber of glass wool or the like and having a ventilating path 3 in an axial direction in the center part, into a pipe-shaped case 2 connected to a ventilation port 1. The sound absorbing material 4 provides in its internal periphery a cylindrical unit 5 formed by a thin metal plate or the like having a mesh-shaped opening, and the sound absorbing material 4 applies masking to its both end surfaces by a heat resisting fabric 6 consisting of glass fiber or the like. Thus because a direct contact part with pressure gas is eliminated by the cylindrical unit 5, the sound absorbing material can be prevented from its wearing and/or deformation without impeding a silencing effect by a simplified structure, further because the sound absorbing material applies masking to its both end surfaces by the heat resisting fabric, dust can be prevented even from infiltrating in the inside of the sound absorbing material.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a noise reduction device for a blower that conveys high-temperature gas, which is capable of preventing wear and deformation of a sound absorbing material.

[Conventional technology]

In noise damping devices for blowers, porous synthetic resins such as soft urethane foam or cotton-like mineral fibers such as glass wool and rock wool are generally used as sound absorbing materials. The heat resistance limit of the synthetic resin is generally about 100° C., and glass wool or the like having high heat resistance is used for gases at temperatures higher than this.

[Problem to be solved by the invention]

In the case of glass wool, etc., the bonding strength between the fibers is weak, so the fibers are broken apart by the wind pressure of the blower at the point of direct contact with the pressurized gas, and are blown away along with the gas, causing them to gradually wear out, or become cotton-like and deformed. Therefore, the cross-sectional area of the ventilation path of the sound-absorbing material may be reduced to increase ventilation resistance. Therefore, in order to prevent this, when using glass wool, etc., the ventilation path side of the sound absorbing material should be lined with a heat-resistant woven fabric made of glass fiber, etc., and a cylindrical body made of wire mesh should be provided around the inner circumference for protection. This has the disadvantage that the structure becomes complicated. Further, even with this structure, it is not possible to protect both end surfaces of the ventilation passage of the sound absorbing material, so there is a drawback that it is impossible to prevent the sound absorbing material from being worn out or deformed.

In order to eliminate the above-mentioned drawbacks, it is an object of the present invention to provide a sound damping device for a blower that has a simple structure and can prevent wear and deformation of a heat-resistant sound-absorbing material made of glass wool or the like.

[Means to solve the problem]

In order to achieve the above-mentioned object, this invention connects a cylindrical case 2 to a vent 1 of a blower, and has an axial ventilation passage 3 in the center made of heat-resistant fibers such as glass wool. A cylindrical sound absorbing material 4 having a cylindrical shape is attached, and a cylindrical body 5 made of a metal plate or the like having a mesh-like opening is provided on the inner periphery of the sound absorbing material 4. Furthermore, it is preferable to mask both end surfaces of the sound absorbing material 4 with a heat-resistant woven fabric 6 made of glass fiber or the like.

[Effect]

Since the ventilation passage 3 side of the sound absorbing material 4 is protected by the metal plate cylindrical body 5 having a mesh-like opening, it is possible to prevent the sound absorbing material 4 from being worn out or deformed without impeding the sound deadening effect. Furthermore, since both end faces of the sound absorbing material 40 are protected by masking with the heat-resistant woven fabric 6, it is also possible to prevent dust from entering the inside of the sound absorbing material 4.

〔Example〕

FIG. 1 shows an embodiment of the invention.

This figure shows an annular blower, in which a vent 1 is provided on the outer peripheral side surface of a casing 8 surrounding an impeller 7, and a silencer 9 is attached to the vent 1.

This muffler 9 is formed by mounting a cylindrical sound absorbing material 4 made of heat-resistant fiber such as glass wool and having an axial ventilation passage 3 in the center inside a cylindrical case 2 connected to a vent l. . A cylindrical body 5 made of a thin metal plate or the like having a mesh opening is provided on the inner periphery of the sound absorbing material 4, and both end surfaces of the sound absorbing material 4 are lined with a heat-resistant woven fabric 6 made of glass fiber or the like. Masking is performed as shown in FIGS. 2 and 3. A piping joint 11 is connected to the end surface of the case 2 opposite to the casing 8 via a flange 10, and the flange 10 presses the outer end surfaces of the sound absorbing material 4 and the cylindrical body 5, respectively, to prevent them from shifting. It is designed to serve as both. The impeller 7 is rotationally driven by a motor 12 attached to a flange on the casing 8, and since the annular blower has a high gas compression ratio, high wind pressure is generated as the impeller 7 rotates, and the discharged gas generally has a high temperature. The base plate of the cylindrical body 5 may be, for example, a thin iron plate with a mesh-like opening formed by punching, a mesh plate processed in the same manner as expanded metal, or a heat-resistant silicone plate on the surface thereof. An iron plate coated with resin or Teflon resin to absorb sound reflection on the surface is used, and the cylindrical body 5 is formed by bending this blank plate and fixing the joints by welding or the like. be done. The heat-resistant woven fabric 6 is made by making, for example, a cross-shaped cut 13 in the center of the plain cloth as shown in FIG. 4, and then cutting and raising the center as shown in FIG. It is integrated by adhering to the outer periphery of the end portion with an adhesive tape 14 or the like. After inserting the sound absorbing material 4 into the outer periphery of the cylindrical body 5 in this state, the sound absorbing material 4 is wrapped in a heat resistant woven fabric 6 as shown in FIG.
The sound absorbing material 4, the cylindrical body 5, and the heat-resistant woven fabric 6 are integrally formed by adhering the sound absorbing material 4, the cylindrical body 5, and the heat-resistant fabric 6.

According to the embodiment, the ventilation path 3 side of the sound absorbing material 4 is protected by a cylindrical body 5 made of a metal plate having a mesh opening, and both end surfaces of the sound absorbing material 4 are protected by being masked with heat-resistant woven fabric 6. Therefore, it is possible to prevent the sound absorbing material 4 from being worn out or deformed without impeding the silencing effect, and furthermore to prevent dust from entering the inside of the sound absorbing material 4.

In the above embodiment, the case of an annular blower was explained, but
The present invention is not limited to this, but can be applied to devices that transport high-temperature gas and devices that use glass wool or the like as the sound absorbing material 4.

〔Effect of the invention〕

According to this invention, in a sound damping device for a blower, the inner circumferential side of a cylindrical sound-absorbing material made of heat-resistant fibers such as glass wool, which becomes the ventilation path, is pressurized by a cylindrical body formed of a metal plate or the like having mesh-like openings. Since there is no direct contact with the gas for protection, it is possible to prevent wear and deformation of the sound absorbing material without impairing the sound damping effect with a simple structure, and furthermore, both ends of the sound absorbing material are masked with heat-resistant woven fabric. Since the sound absorbing material is protected by the sound absorbing material, it is possible to prevent dust from entering inside the sound absorbing material.

[Brief explanation of the drawing]

FIG. 1 is a partial longitudinal sectional view of an embodiment of the invention, FIG. 2 is a side view taken along line nn in FIG. 1, FIG. 3 is a perspective view of the sound absorbing material in FIG. 1, and FIG. 4 is a perspective view showing the unfolded state of the heat-resistant woven fabric shown in FIGS. 1 to 3, FIG. 5 is a perspective view of the heat-resistant woven fabric shown in FIG. FIG. 3 is a perspective view of the cylindrical body shown in the figure, a heat-resistant woven fabric, and a sound absorbing material integrated together. 1... Ventilation port, 2... Case, 3... Ventilation path, 4
... Sound absorbing material, 5 ... Cylindrical body, 6 ... Heat-resistant woven fabric, 9
...silencer.

Claims (1)

[Claims] 1) A cylindrical case is connected to the vent of the blower, and a cylindrical sound-absorbing material made of heat-resistant fiber such as glass wool and having an axial ventilation passage in the center is installed inside the case. 1. A sound damping device for a blower, characterized in that a cylindrical body formed of a metal plate or the like having a mesh-like opening is provided on the inner periphery of the sound absorbing material. 2) A cylindrical case is connected to the vent of the blower, and a cylindrical sound-absorbing material made of heat-resistant fiber such as glass wool and having an axial ventilation passage in the center is installed inside the case. A sound damping device for a blower, characterized in that a cylindrical body made of a metal plate or the like having a mesh opening is provided on the inner periphery of the air blower, and both end surfaces of the sound absorbing material are masked with a heat-resistant woven fabric made of glass fiber or the like.