JPH07117071B2 - Blower silencer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler for a blower that conveys high-temperature gas, which is capable of preventing wear or deformation of a sound absorbing material.

[Conventional technology]

In a muffler of a blower, a porous synthetic resin such as soft urethane foam or a cotton-like mineral fiber such as glass wool or rock wool is generally used as a sound absorbing material. The heat resistance limit of the synthetic resin is generally about 100 ° C., and glass wool having a high heat resistance is used for a gas having a high temperature exceeding this.

[Problems to be Solved by the Invention]

In the above-mentioned glass wool, since the mutual binding force of the elementary fibers is weak, the fibers are scattered by the wind pressure of the blower at the direct contact portion with the pressurized gas, and the fibers are blown away with the gas and gradually worn away, or deformed like cotton. Since it is easy, the ventilation passage may be increased by reducing the cross-sectional area of the sound-absorbing material. Therefore, when glass wool or the like is used to prevent this, a heat-resistant woven fabric made of glass fiber or the like is lined on the ventilation passage side of the sound absorbing material, and a wire mesh tubular body is provided on the inner periphery to protect it. Since it is necessary, there is a drawback that the structure becomes complicated. Further, even with such a structure, since both end surfaces of the ventilation path of the sound absorbing material cannot be protected, there is a drawback in that it is not possible to prevent wear or deformation of the sound absorbing material.

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, an object of the present invention is to provide a muffler for a blower which has a simple structure and can prevent wear or deformation of a heat-resistant sound absorbing material such as glass wool.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention connects a cylindrical case 2 to a ventilation port 1 of a blower, and the inside of the case 2 is made of a heat-resistant fiber such as glass wool and has an axial ventilation passage 3 at its center. The sound absorbing material 4 having a cylindrical shape is attached to the inner surface of the sound absorbing material 4, and the cylindrical body 5 formed of a metal plate or the like having a mesh opening is provided on the inner periphery of the sound absorbing material 4. The heat-resistant woven fabric 6 is masked.

[Action]

Since the ventilation passage 3 side of the sound absorbing material 4 is protected by the metal plate tubular body 5 having a mesh-like opening, the sound absorbing material 4 can be prevented from being worn or deformed without impairing the sound deadening effect. Furthermore, since both end surfaces of the sound absorbing material 4 are masked and protected by the heat resistant woven fabric 6, it is possible to prevent dust from entering the inside of the sound absorbing material 4.

〔Example〕

FIG. 1 shows an embodiment of the present invention. This drawing shows an annular blower, in which a casing 8 surrounding the impeller 7 is provided with a vent 1 on the outer peripheral side surface, and a muffler 9 is attached to the vent 1. This muffler 9 has a vent 1
It is formed by mounting a cylindrical sound absorbing member 4 made of heat-resistant fiber such as glass wool and having an axial ventilation passage 3 at the center in a cylindrical case 2 connected to the. A cylindrical body 5 formed 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 made of a heat resistant woven cloth 6 made of glass fiber or the like. It is masked as shown in FIGS. 2 and 3. A pipe joint 11 is coupled to an 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 tubular body 5 respectively to prevent their position displacement. It is designed to serve as both. The impeller 7 is rotatably driven by a motor 12 mounted on a casing 8 with a flange, and the annular blower has a high gas compression ratio, so that a high wind pressure is generated as the impeller 7 rotates, and the discharged gas generally has a high temperature. The base plate of the tubular body 5 is, for example, a thin iron plate with punched mesh openings, a mesh plate processed in the same manner as expanded metal, and a silicon resin having heat resistance on the surface thereof. Alternatively, a material such as Teflon resin coated to absorb the reflection of sound on the surface of the iron plate is used, and the tubular body 5 is formed by fixing the bent joint part of the base plate by welding or the like. It As shown in FIG. 4, the heat-resistant woven fabric 6 has a slit 13 in the shape of a cross in the center of the flat fabric, and the center of the fabric is cut and raised as shown in FIG. It is integrated by adhering to the outer periphery of the end of the with an adhesive tape 14 or the like. After inserting the sound absorbing material 4 into the outer periphery of the tubular body 5 in this state, the heat absorbing woven cloth 6 is wrapped around the sound absorbing material 4 as shown in FIG. The sound absorbing material 4, the tubular body 5, and the heat-resistant woven fabric 6 are integrally formed by adhering with each other.

According to the above-mentioned embodiment, the ventilation passage 3 side of the sound absorbing material 4 is protected by the metal plate tubular body 5 having the mesh openings, and both end surfaces of the sound absorbing material 4 are protected by masking with the heat resistant woven cloth 6. Therefore, it is possible to prevent the sound absorbing material 4 from being worn or deformed without impairing the sound deadening effect, and also to prevent dust from entering the inside of the sound absorbing material 4.

In the above embodiment, the case of the annular blower has been described,
The present invention is not limited to this, and can be applied to those that convey high-temperature gas and those that use glass wool or the like for the sound absorbing material 4.

〔The invention's effect〕

According to the present invention, in the muffler of the blower, the inner peripheral side which is the ventilation passage of the cylindrical sound absorbing material using the heat resistant fiber such as glass wool is pressed by the cylindrical body formed of the metal plate or the like having the mesh opening. Since it is protected by eliminating direct contact with gas, it is possible to prevent wear and deformation of the sound absorbing material with a simple structure without hindering the sound deadening effect.Furthermore, both end surfaces of the sound absorbing material are masked with heat resistant woven cloth. Since it is protected by the above, it is possible to prevent dust from entering the inside of the sound absorbing material.

[Brief description of drawings]

1 is a partial longitudinal sectional view of an embodiment of the present invention, FIG. 2 is a side view taken along line II-II of FIG. 1, FIG. 3 is a perspective view of the sound absorbing material of FIG. 1, and FIG. 1 is a perspective view showing a developed state of the heat resistant woven fabric of FIGS. 1 to 3, FIG. 5 is a perspective view of the heat resistant woven fabric of FIG. 4 integrated with a tubular body, and FIG. It is a perspective view of the state where the cylindrical body and heat resistant woven fabric of the figure and the sound absorbing material are integrated. 1 ... Vent hole, 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 a ventilation port of a blower, and a cylindrical sound-absorbing material made of heat-resistant fiber such as glass wool and having an axial ventilation path at its center is mounted in the case. The sound-absorbing material is provided with a cylindrical body formed of a metal plate or the like having a mesh-like opening on the inner periphery thereof, and both end surfaces of the sound-absorbing material are masked with a heat-resistant woven fabric made of glass fiber or the like, and thus the sound deadening of the blower apparatus.