JPH07180700A - Exhauster for bag filter - Google Patents

Abstract

PURPOSE:To reduce noise generated from an exhaust fan by providing an exhaust muffler at the horizontal part of an exhaust passage connected to the lower reaches of the exhaust fan. CONSTITUTION:The interior of a case 11 is vertically partitioned by filter elements 13 formed of permeable bags suspended being disposed horizontally. When an exhaust fan 23 is operated, the internal pressure of the case 11 is lowered, and exhaust air containing dust and the like to be eliminated flows into an air inlet chamber 14 from an air inlet 16. While the exhaust air ascends toward an air exhaust chamber 15 from the air inlet chamber 14, the dust and the like are eliminated by the filter elements 13. The exhaust air flows into an exhaust unit 20, forming an exhaust passage 25, through an exhaust port 17 provided with the exhaust fan 23, and flows horizontally to reach an exhaust muffler 30. The exhaust muffler 30 is interposed at a part of the exhaust passage 25. When the exhaust air passes through a sound absorbing narrow passage formed of sound absorbing material, noise contained in the exhaust air is damped being absorbed by the sound absorbing material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a bag filter mainly used in a dust collecting device for removing dust and soot, and more particularly to a device for reducing noise generated by an exhaust fan. .

[0002]

2. Description of the Related Art Generally, a bag filter is provided in a passage for discharging an air flow containing dust, soot, etc. (hereinafter, simply referred to as "dust") into the atmosphere, and is used to remove dust contained in the air flow. It That is, it is composed of a large empty chamber interposed in the passage and a bag-shaped filter membrane that divides the interior into two chambers, a front chamber and a rear chamber. When the airflow to be filtered has a high temperature exceeding 100 ° C., the airflow to be discharged from the bag filter passes through the chimney and is discharged into the atmosphere at a position away from the human body. Released directly into the atmosphere.

[0003]

The air flow containing the dust is energized and flows by an exhaust fan provided on the downstream side of the bag filter, but when the output is large, the noise generated from the air flow is generated. Large, sometimes exceeding 80 decibels. The noise emitted by this exhaust fan is shown as a corner when the airflow is emitted through the chimney, and when it is emitted directly into the atmosphere from the bag filter, its exhaust port is close to the surface of the earth, and its influence on the surroundings. Was great.

[0004]

In order to solve the above-mentioned inconvenience, the present invention divides the inside of the housing by a filter element, one side of which is formed as an air intake chamber and the other side of which is formed as an exhaust air chamber. An exhaust fan is provided in an exhaust passage that connects the exhaust chamber and the atmosphere, and an exhaust silencer is provided downstream of the exhaust fan to solve the problem. Then, specifically, the inside of the housing is divided into upper and lower parts by a filter element, the lower side thereof is configured as an air intake chamber and the upper side thereof is configured as an air exhaust chamber, and the air exhaust chamber and the atmosphere are provided on the top of the air exhaust chamber. The problem is solved by opening an communicating exhaust passage, providing an exhaust fan in the exhaust passage, and providing an exhaust silencer on the downstream side of the exhaust fan. Furthermore,
Specifically, the inside of the housing is divided into two chambers by a filter element, the lower side thereof is configured as an air intake chamber and the upper side thereof is configured as an air exhaust chamber, and the air exhaust chamber and the atmosphere are provided at the top of the air exhaust chamber. An open exhaust passage is provided, and an exhaust fan is provided at the opening, and an exhaust passage connected to the downstream side of the exhaust fan extends in a substantially horizontal direction along the top surface of the exhaust chamber, An exhaust air silencer is provided in the horizontal portion of the exhaust passage to solve the problem.

[0005]

The airflow from which dust and the like have been removed by passing through the filter element is sucked out of the air exhaust chamber on the upper surface of the air exhaust fan by the air exhaust fan provided at the top of the air exhaust chamber, and is introduced into the air exhaust passage from the air exhaust fan to the atmosphere. It is released into the atmosphere at the shortest distance through the exhaust silencer provided. The noise generated from the exhaust fan flows toward the atmosphere along the airflow, but in the process, it is dissipated into the atmosphere after being attenuated by the exhaust silencer and damped. The air exhaust passage is configured by an air exhaust unit that is horizontally arranged so as to cover the top surface of the housing, and the airflow exhausted from the air exhaust chamber flows horizontally along the top surface of the housing. It is released into the atmosphere through the exhaust muffler provided inside.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In the figure, 10 is a bag filter made by integrally combining three pairs of elements 10a and 10a. Each element 10a
Has a housing 11 assembled by welding steel plates. Case 1
1 is formed in a substantially square shape, and a hopper 12 having an inverted quadrangular pyramid shape is attached to the lower surface thereof. Reference numeral 10b is a beater for knocking off dust and the like adhering to the filter element 13 described later.

The inside of the housing 11 is a filter element 1 which is composed of a large number of breathable bags which are horizontally arranged and suspended.
It is divided into upper and lower parts by 3, and the lower side is the ventilation chamber 1
4 and the upper side thereof is configured as an air exhaust chamber 15. That is, the air inlet 16 is provided on the side surface of the air inlet chamber 14, and the air outlet 17 is opened on the top surface of the air outlet chamber 15. Reference numeral 18 is a dust box provided at the lower end of the hopper 12, and 19 is an eaves member attached to a discharge port 24 described later. Reference numeral 40 is a step pedestal provided with a handrail around the housing 11.

The air outlet 17 is provided on the top surface of the air exhaust chamber 15.
Exhaust unit 2 that covers and extends horizontally parallel to the top surface
0 is attached detachably. That is, the air exhaust unit 20 has a substantially rectangular box shape made by welding steel plates, and its lower edge is attached to the outer surface of the housing 11 by a disassembleable fastener (not shown) such as a bolt. The eaves member 19 described above is screwed to one side thereof.

The inflow port of the air exhaust unit 20 is formed by an inflow port member 22 protruding on the lower surface, and an exhaust fan 23 is attached to the inflow port member 22. 23a is an exhaust fan 2
3 is a drive electric motor for driving 3. Reference numeral 24 denotes an exhaust port opened on the end surface of the air exhaust unit 20. Thus, an exhaust passage 25 communicating with the atmosphere from the exhaust port 17 is formed on the inner surface of the exhaust unit 20. It should be noted that opening the discharge port 24 laterally is not essential in the configuration of the invention, and may be opened upward without any problem. 26 is an inspection door that closes the inspection port provided at the end of the air exhaust unit 20, 27
Is an electric control box for supplying power to the exhaust fan 23.

An exhaust fan 23 is provided inside the exhaust unit 20.
Expansion chamber 2 consisting of a relatively large empty space formed in the vicinity of the
0a and the exhaust silencer 30 provided on the other side. In this embodiment, the exhaust silencer 30 includes a sound absorbing narrow passage 32 formed by a cylindrical sound absorbing material 31 arranged over the entire cross section of the exhaust passage 25. That is, the sound absorbing narrow path 32 is formed by molding glass wool, metal wool or other heat resistant fiber into a cylindrical shape. The exhaust silencer 30 is an exhaust passage 25 that is horizontally arranged along the top surface of the housing 11.
Since it is housed inside, the height of the bag filter 10 can be kept low.

The exhaust muffler 30 is not limited to the sound absorbing type that absorbs noise by the sound absorbing material as shown in this embodiment.
As shown in FIG. 9, a large number of metal pipes 31 ″ and 31 ″ are used in place of the cylindrical sound absorbing material 31, and these are combined with a long pipe and a short pipe to pass through each metal pipe 31. It may be a so-called interference type in which the generated noises are mutually interfered to attenuate the noises. Further, as shown in FIG. 8, a plurality of diaphragm members 3 are used instead of the sound absorbing material 31.
Needless to say, a so-called expansion / contraction type in which a plurality of stages 1 ′ and 31 ′ are arranged in series and the energy of the airflow passing therethrough is attenuated may be used.

Since this embodiment is constructed as described above, when the exhaust fan 23 is operated, the internal pressure of the housing 11 drops, and exhaust air containing dust to be removed is introduced into the air inlet 1.
6 flows into the ventilation chamber 14. The exhaust air is removed from dust and the like by the filter element 13 while rising from the air intake chamber 14 toward the air exhaust chamber 15. Then, it flows into the exhaust unit 20 forming the exhaust passage 25 through the exhaust port 17 provided with the exhaust fan 23, flows horizontally, and reaches the exhaust silencer 30.

The exhaust silencer 30 is provided in a part of the exhaust passage 25. When the exhaust wind passes through the sound absorbing narrow passage 32 formed by the sound absorbing material 31, the noise contained therein is absorbed. Sound is absorbed and attenuated by the material 31. Thus, in this embodiment, the noise level, which was about 80 decibels when the exhaust silencer 30 was not provided, was reduced to 58 decibels by installing it.

[0013]

As described above, according to the present invention, the exhaust passage 25 is provided at the top of the casing 11 which constitutes the bag filter 10, and the opening to the atmosphere is relatively low. Nevertheless, since the housing 11 prevents the diffusion to the ground, the influence of noise on the surroundings is reduced. Also,
Since the exhaust passage muffler 30 is provided in the exhaust passage 25, the level of noise emitted from the exhaust passage 25 can be further reduced. If the exhaust passage 25 is provided along the top of the housing 11 and the exhaust silencer 30 is provided there, the height of the bag filter 10 will not be increased even if the exhaust silencer 30 is attached. It has the effect that it can be stopped.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a front view of a bag filter to which an apparatus is applied.

FIG. 2 is a plan view thereof.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a partially cutaway plan view showing a main part thereof.

5 is a sectional view taken along line VV in FIG.

FIG. 6 is a right side view thereof.

FIG. 7 is a left side view thereof.

FIG. 8 is a cross-sectional view of a main part showing another embodiment.

FIG. 9 is a sectional view of an essential part showing another embodiment.

[Explanation of symbols]

 10 ... Bag filter 11 ... Housing 12 ... Hopper 13 ... Filter element 14 ... Ventilation chamber 15 ... Ventilation chamber 16 ... Ventilation port 17・ ・ ・ ・ Exhaust port 18 ・ ・ ・ ・ ・ ・ Dust box 19 ・ ・ ・ ・ Eaves member 22 ・ ・ ・ ・ Inlet member 23 ・ ・ ・ ・ ・ ・ Exhaust fan 23a ・ ・ ・ Drive motor 24 ・ ・ ・ ・ ・ ・ Exhaust port 24a・ ・ ・ Flange 25 ・ ・ ・ ・ Exhaust air passage 26 ・ ・ ・ ・ ・ ・ Inspection door 27 ・ ・ ・ ・ Electric control box 30 ・ ・ ・ ・ Exhaust air silencer 31 ・ ・ ・ Sound absorbing material 32 ・ ・ ・ Sound absorbing fine Road

Claims (4)

[Claims] Claim: What is claimed is: 1. An inside of a housing is divided by a filter element, one side of which is configured as an air intake chamber and the other side thereof is configured as an air exhaust chamber, and the air is exhausted to an air exhaust passage that connects the air exhaust chamber and the atmosphere. An air exhaust device for a bag filter, in which an air exhaust fan is provided and an air exhaust silencer is provided downstream of the air exhaust fan. 2. An inside of the housing is divided into upper and lower parts by a filter element, the lower side of which is defined as an air intake chamber and the upper side thereof is defined as an air exhaust chamber, and the exhaust chamber which connects the air exhaust chamber and the atmosphere is connected to the top of the air exhaust chamber. Open the air passage, install an exhaust fan in the exhaust passage,
An exhaust device for a bag filter that has an exhaust silencer downstream of the exhaust fan. 3. The interior of the housing is divided into two chambers by a filter element, the lower side thereof is configured as an air intake chamber and the upper side thereof is configured as an air exhaust chamber, and the air exhaust chamber is provided at the top of the air exhaust chamber. An exhaust passage that communicates with the atmosphere and an exhaust fan is provided at the opening, and the exhaust passage that is connected to the downstream side of the exhaust fan extends in a substantially horizontal direction along the top surface of the exhaust chamber. An air exhaust device for a bag filter, which is composed of an extending air exhaust unit, and an air exhaust silencer is provided in the air exhaust unit. 4. The sound exhaust silencer according to any one of claims 1 to 3, wherein the exhaust muffler is provided with a plurality of sound absorbing fine particles provided with a sound absorbing material on an inner surface thereof, which is interposed in a part of an exhaust air passage. An air exhaust device for a bag filter made up of roads.