JPH0636262Y2 - Muffler for axial blowers - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] This invention is installed in front of and behind an axial blower of an air conditioning equipment or a ventilation equipment, and is used by being connected to ventilation ducts on the air inlet side and the air outlet side. For silencers for.

[Conventional technology]

As shown in FIG. 3, a conventional silencer for an axial-flow blower has a sound-absorbing outer shell 4 in which a sound-absorbing material 3 is loaded in a space between a casing-shaped outer cylinder 1 and a punching metal inner cylinder 2, and a sound-absorbing outer shell 4. Torso 4
The sound-absorbing inner body 7 (wherein the sound-absorbing inner body 7 is secured by the supporting member 6 in a state as shown in the figure by securing the ventilation passage 5 inside).
Has a structure in which a sound absorbing material 9 such as glass wool is loaded inside a perforated hollow body 8 having a large number of small holes formed on its outer periphery). The muffler is installed in front of and behind the axial blower 10 in the air conditioning equipment or ventilation equipment, and is connected to the ventilation ducts B and C on the air inlet side and the air outlet side as shown in FIG.

[Problems to be solved by the invention]

However, in the conventional tubular silencer, since the punching metal inner cylinder 2 of the sound absorbing outer body 4 is formed by a straight cylinder having a hole having the same diameter as the ventilation ducts B, C, the duct B,
To connect with a blower outer cylinder 10a with a smaller diameter than C (in air conditioning equipment or ventilation equipment, the ventilation ducts B and C are usually larger than the outer cylinder 10a of the axial blower 10) , It is necessary to have two connecting cylinders A and A on the inlet side and the outlet side of the blower, which are expanded in diameter in a taper shape, which is disadvantageous in terms of cost and connection work, and the silencer connection length is equivalent to two connecting cylinders. However, there is a problem that the installation space becomes large and the installation space becomes large.

[Means for solving problems]

In order to solve the above-mentioned conventional problems, the present invention is used by connecting it between an axial blower of an air conditioning equipment or a ventilation equipment and large air ducts on the air inlet side and the air outlet side before and after this. A silencer for an axial blower, which comprises a sound absorbing outer body having a structure in which a sound absorbing material is loaded in a space between an outer cylinder and a punching metal inner cylinder arranged on the inner periphery of the outer cylinder, and punching of the sound absorbing outer cylinder. A sound absorbing inner body having a structure in which a sound absorbing material is loaded into a perforated hollow body which is arranged and fixed so as to secure a ventilation passage from the metal inner cylinder to an inner peripheral portion, and the diameter of the sound absorbing inner body is The motor diameter or hub diameter of the axial blower is set to be approximately the same, and at least the punching metal inner cylinder of the sound absorbing outer casing has one end reduced to the same diameter as the outer cylinder diameter of the axial blower and the other end connected to the ventilation duct. Tapered with a constant inclination angle over the entire length in a state of expanding to the same diameter The cone-shaped punching metal inner cylinder is configured such that one end of the inner diameter reducing side can be directly connected to the outer cylinder of the axial blower and the other end of the inner diameter expanding side can be directly connected to the ventilation duct. It is a thing.

[Action]

In the case of the silencer for an axial blower having the above-mentioned configuration, one end of the cone-shaped punching metal inner cylinder is reduced to the outer cylinder of the axial blower, and the other end is expanded to the ventilation duct, and is tapered as in the conventional case. It is possible to directly connect to each other without requiring a large-diameter expansion connecting tube, which can reduce the cost and simplify the connecting work, and also can reduce the installation space. Moreover, since the sound absorbing inner body has a proper diameter and the sound absorbing outer body has a constant degree of expansion and contraction (tapered state) over the entire length and a constant inclination angle, it is directly connected to an axial blower with high air volume, static pressure and flow velocity. In spite of this, the loss pressure is small and the air flow is rectified, so that the blower blades can be fatigued and damaged without damaging the characteristics of the blower. Compared to a conventional tubular silencer with a metal inner cylinder having a straight cylinder structure, a large silencing effect can be obtained.

〔Example〕

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 and 1 (a).
The muffler according to the embodiment of FIG.
A silencer for an axial-flow blower, which is used by being connected and arranged between an axial-flow blower (10) of an air-conditioning facility or a ventilation facility and large-diameter ventilation ducts (B, C) on the air inlet side and the outlet side before and after this. This silencer. A sound-absorbing outer cylinder 14 having a structure in which a sound-absorbing material 13 is loaded in a space between a casing-type outer cylinder 11 and a punching-metal inner cylinder 12 arranged on the inner periphery thereof, and a punching-metal inner cylinder of the sound-absorbing outer cylinder 14. A ventilation member 15 is secured to the inner peripheral portion of the support member 16
The sound absorbing inner body 17 has a structure in which a sound absorbing material 19 such as glass wool is loaded in a perforated hollow body 18 having a large number of small holes formed and fixed by the above.

The diameter of the sound absorbing inner body 17 is substantially equal to the motor diameter or the hub diameter of the axial blower 10 as shown. Further, one end of the punching metal inner cylinder 12 of the sound absorbing outer case 14 has a diameter equal to the diameter d of the outer cylinder 10a of the axial blower 10 and the other end has a diameter equal to the connection diameter D of the ventilation ducts B and C. In the state of expanding the diameter, the shape of the cone is a tapered shape with a gentle constant inclination angle over the entire length.

One end of the punched metal inner cylinder 12 of the sound absorbing outer shell 14 of this cone-shaped silencer is directly connected to the outer cylinder 10a of the axial blower 10 by means such as flange joining or welding, and the other end is expanded. The (connection port portion 11a) is directly connected to the air inlet side and outlet side ventilation ducts B and C by means such as bolt bonding or welding.

In the silencer for an axial blower having such a configuration, one end of the cone-shaped punching metal inner cylinder 12 on the reduced diameter side is the outer cylinder 10a of the axial blower 10, and the other end is on the expanded diameter side ventilation ducts B and C. Unlike the conventional case, it is possible to directly connect to each other without using the tapered diameter expansion connecting cylinders A, A, and it is possible to reduce the cost and simplify the connecting work, and to reduce the installation space. Moreover, since the sound absorbing inner body 17 has an appropriate diameter, and the sound absorbing outer body 14 has a constant degree of expansion and contraction (tapered state) over the entire length and has a constant inclination angle, an axial flow blower having high air volume, static pressure and flow velocity. Despite being directly connected to the air conditioner, the loss pressure is small, and the airflow rectification effect is also available, which reduces the noise and vibration generated by the airflow without damaging the characteristics of the air blower and causing fatigue to the blades of the air blower. As compared with the conventional tubular type silencer in which the punching metal inner cylinder has a straight tube structure, a large silencing effect can be obtained.

FIG. 2 shows a second embodiment of the present invention.
In the muffler according to the embodiment of the present invention, both the casing-type outer cylinder 11 and the punching metal inner cylinder 12 of the sound absorbing outer case 14 are formed in a cone shape, and one end of the punching metal inner cylinder 12 has a protruding portion.
12b is made to correspond to the outer cylinder diameter d of the axial blower 10, and the other end protruding portion 12a is made to correspond to the connection diameter D of the ventilation ducts B and C, and flange connection is made to the ventilation ducts B and C and the blower outer casing 10a. It is constructed so that it can be directly connected by means such as welding.
Since other configurations are similar to those shown in FIG. 1, the same parts are designated by the same reference numerals and detailed description thereof will be omitted.

[Effect of device]

In the muffler of the present invention, at least the punching metal inner cylinder 12 of the muffler outer shell 14 is configured in the cone shape as described above.
Even without using A, it is possible to directly connect to the blower outer cylinder 10a and the ventilation ducts B and C. Therefore, it is advantageous in terms of cost and connection work, and the silencer connection length is shortened by the intervention length of the connection tube, so that the installation space can be reduced.

Further, the muffler of the present invention in which the punching metal inner cylinder 12 of the sound deadening outer casing 14 is configured in a cone shape is compared with the conventional tubular muffler in which the punching metal inner cylinder is in a straight cylinder structure. As a result, a large noise reduction performance is obtained, and there is also a flow rectifying effect, and there is also a performance effect that pressure loss is small.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a structure of a silencer according to a first embodiment of the present invention in a connection relation with an axial blower and a ventilation duct, and FIG. 1 (a) is a diagrammatic view of the silencer. 2 is a schematic sectional view showing the structure of a muffler according to a second embodiment of the present invention, showing a cross-sectional view of essential parts showing a connection relationship between an axial flow fan and a ventilation duct, and FIG. 3 is a conventional tube. It is a partial cross-sectional view showing a structure of a Raler silencer in a connected state with an axial blower and a ventilation duct. A: Tapered expanded connection tube, B: Air inlet side ventilation duct, C: Air outlet side ventilation duct, D: Duct connection diameter, 10 ... Axial blower, 10a ... Same blower Outer cylinder, d ...
… Blower outer diameter, 11 …… Sound absorbing outer cylinder outer cylinder, 12 …… Punching metal inner cylinder, 13 …… Sound absorbing material, 14 …… Sound absorbing outer cylinder,
15 …… Ventilation channel, 16 …… Inner shell support member, 17 …… Sound absorbing inner shell, 18 …… Hollow hollow body, 19 …… Sound absorbing material.

Claims (1)

[Scope of utility model registration request] 1. A silencer for an axial-flow blower, which is used by being connected and arranged between an axial-flow blower of an air-conditioning facility or a ventilation facility and large-diameter ventilation ducts on the front and rear sides of the air. ,
A sound-absorbing outer case configured by loading a sound-absorbing material into the space between the outer case and the punching-metal inner case arranged on the inner circumference, and a ventilation flow from the punching-metal inner case of the sound-absorbing outer case to the inner circumference. A sound-absorbing inner body having a structure in which a sound-absorbing material is loaded in a perforated hollow body that secures a passage and is fixed, and the diameter of the sound-absorbing inner body is the motor diameter or hub diameter of the axial blower. Approximately the same length, and at least the punching metal inner cylinder of the sound absorbing outer casing is reduced in diameter at one end to be equal to the outer cylinder diameter of the axial blower and at the other end to be expanded to be equal to the connection diameter of the ventilation duct. A cone-shaped taper with a constant inclination angle over the entire length, and one end of the cone-shaped punching metal inner cylinder on the reduced diameter side is directly connected to the outer cylinder of the axial blower and the other end is connected to the ventilation duct on the expanded diameter side. A silencer for an axial-flow blower, which is characterized by being obtained.