JP3121901U - Silencer for intake fan, dust collector for dust such as intake fan and asbestos - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a noise generated at an air introduction portion of an intake fan and secure a necessary intake flow rate. In addition, the impact generated at the air intake portion of the intake fan is reduced, and the occurrence of injury due to inadvertent operation is prevented.
A silencer 61 for an intake fan according to the present invention extends in a tangential direction with respect to a cylindrical intake box 63 connected to an intake port 35 of the intake fan 11 and a peripheral body 65 of the intake box 63. The air A including the dust B and the like guided into the introduction pipe 67 flows along the inner wall surface 69 in the peripheral body 65 of the intake box 63, and the intake fan 11 is connected to the intake fan 67. The swirl flow in the same direction as the rotation direction is configured to flow into the intake port 35 of the intake fan 11.
[Selection] Figure 7

Description

  The present invention relates to a silencer for an intake fan that can efficiently reduce noise generated by suddenly taking in external air into the intake fan without impairing the intake air flow rate of the intake fan. Intake fan silencer suitable for dust collectors for dust, such as an asbestos equipped with an intake fan used for sucking air containing dust particles, an intake fan equipped with the intake fan silencer, and the intake fan silencer The present invention relates to a dust collector for dust such as asbestos.

Conventionally, the intake fan 101 is used in various applications. As shown in FIGS. 13A and 13B, the intake fan 101 includes a rotating shaft 103, a rotating blade 105 attached to the rotating shaft 103, a motor (not shown) as a driving unit that rotationally drives the rotating blade 105, And a fan casing 107 covering the rotary blade 105.
An air inlet 111 is formed in one end surface 109 of the fan casing 107 in the axial direction of the rotating shaft 103, and a cylindrical introduction extending linearly in the axial direction of the rotating shaft 103 is formed in the air inlet 111. A pipeline 113 is connected.

  Then, as shown by the arrows in the figure, the outside air reaches the fan casing 107 from the introduction pipe 113 and flows into the central portion where the rotation shaft 103 of the intake fan 101 exists in a straight line. The air that has flowed into the center of the fan casing 107 collides with the rotary blades 105, is forced to change the flow direction, and flows toward the outer periphery in the radiation direction perpendicular to the rotation shaft 103. It is guided by the wall surface and is discharged from the exhaust port 117 formed in the peripheral body 115 into the casing of another device or into the room.

  In this case, in the central portion of the fan casing 107 where the air flow changes abruptly, it is generated by pressure noise caused by sudden pressure fluctuations, collision noise caused by the inflowing air colliding with the rotating blades 105, or turbulence or collision of airflow. The turbulent noise generated by the vortex was generated and became a problem. Therefore, conventionally, a sound absorbing material is provided for the intake port 111 of the intake fan 101 to absorb sound, thereby reducing the magnitude of the noise. However, due to the problem of a reduction in the intake air flow rate of the intake fan, the noise cannot be effectively reduced to a predetermined level only by the sound absorbing material, and an intake fan silencer that can exhibit an effective noise reduction effect. Development of was desired.

On the other hand, a lot of asbestos has been conventionally sprayed as a heat insulating material or the like on the ceiling or wall of a building. In recent years, asbestos has become widely known as a carcinogenic substance, the removal and recovery of asbestos sprayed to prevent scattering caused by aging of asbestos sprayed on the ceiling and walls of buildings It is an urgent issue.
Therefore, recently, dust collectors as shown in the following Patent Document 1 have been used, and removal of asbestos sprayed on the ceiling and wall surface of the building, efficiency of collection work and ensuring of work safety and Is planned.

Such a dust collector is also provided with the intake fan as described above. However, asbestos dust is contained in the air sucked by the intake fan, and when the asbestos dust lump is agglomerated, the asbestos dust lump is vigorously applied to the rotating blades of the intake fan. There was a possibility of damaging the rotating blades due to the collision.
In addition, asbestos dust particles and other foreign substances may adhere to and accumulate on the intake fan, and in order to remove the adhering and accumulated asbestos dust particles, the body of the body while the intake fan is rotated and rotated by mistake. In some cases, some hands were placed in the introduction pipeline. However, it is anticipated that a hand accidentally placed in the inlet pipe will reach the rotary blades of the intake fan and touch the rotary blades, leading to a serious accident. It was pointed out as an important issue.
JP 2004-275800 A

  In summary of the above-mentioned background art and the problems that the background art has, the intake fan silencer that can achieve a desired noise reduction effect without reducing the intake air flow rate of the intake fan is summarized. Is to develop. In addition, by applying the intake fan silencer to the dust collector used at the asbestos removal and recovery site, the asbestos dust mass vigorously collides with the intake fan rotating blades, preventing damage to the rotating blades, To provide a dust collector for dust such as a safe intake fan and asbestos that does not have to worry about touching a rotating blade even if a part of the body is inadvertently placed in the introduction pipe line.

  The present invention has been made on the basis of these points, and the purpose of the present invention is to prevent noise by preventing a sudden change in the air flow at the air intake part of the intake fan, which is the cause of noise generation. In addition to ensuring the necessary intake air flow rate of the intake fan, the collision when the asbestos dust mass collides with the rotating blades is alleviated, and an operator inadvertently puts a part of the body into the introduction conduit An object of the present invention is to provide a safe silencer for an intake fan that does not worry about touching the rotating blades at all, an intake fan equipped with the intake fan silencer, and a dust collector such as asbestos equipped with the intake fan silencer.

In order to achieve the above object, a silencer for an intake fan according to claim 1 of the present invention extends in a tangential direction with respect to a cylindrical intake box connected to an intake port of the intake fan and a peripheral body portion of the intake box. The air containing dust and the like led into the introduction pipe flows along the inner wall surface of the peripheral body portion of the intake box and is in the same direction as the rotation direction of the intake fan. It is characterized in that it is configured to flow into the intake port of the intake fan as a swirling flow in the direction.
According to a second aspect of the present invention, there is provided the intake fan silencer according to the first aspect, wherein the air guided from the introduction pipe line efficiently flows into the intake port of the intake fan in the intake box. Further, a rectifying plate for adjusting the swirling flow is provided.
The silencer for an intake fan according to claim 3 is the silencer for an intake fan according to claim 2, wherein even if a part of the body inadvertently enters the introduction conduit, It is characterized in that a part is provided at a position that prevents entry into the intake port of the intake fan.
A silencer for an intake fan according to claim 4 is the silencer for an intake fan according to claim 3, wherein the rectifying plate is formed of a rectangular plate-shaped member, and is arranged inside the intake conduit and the intake box. One end is connected in the vicinity of the connecting portion, and the other end is provided in a shape curved in the direction along the swirl flow.
According to a fifth aspect of the present invention, there is provided an intake fan comprising: a rotating blade that rotates in the direction of taking in external air around a rotating shaft; a driving means that rotationally drives the rotating blade; and the rotating blade that covers the rotating blade. An intake fan comprising a fan casing that guides inflowing air to an exhaust port, wherein the intake port of the intake fan is provided with the silencer for an intake fan according to any one of claims 1 to 4. To do.
Further, the dust collector for dust such as asbestos according to claim 6 is configured such that air containing dust such as asbestos that is detachably attached to the drum passes from the inside to the outside by passing the dust from the inside to the outside. A filter that is detachably attached to the drum, a bag body that contains dust such as asbestos that is detachably attached to the drum, and a filter that sucks air containing dust such as asbestos that is connected to the drum. A dust collector for dust such as asbestos, comprising an intake fan that pulverizes a dust mass in the dust that is supplied and sucked into the intake fan, wherein the intake port of the intake fan is for the intake fan according to any one of claims 1 to 4 A silencer is provided.

Therefore, according to the silencer for an intake fan according to the present invention, a cylindrical intake box connected to the intake port of the intake fan, and an introduction pipe connected to extend in a tangential direction to the peripheral body portion of the intake box The air containing the dust and the like introduced into the introduction pipe flows along the inner wall surface of the peripheral body portion of the intake box and becomes a swirling flow in the same direction as the rotation direction of the intake fan. Since it is configured to flow into the intake port, the air flowing into the intake fan from the intake port of the intake fan flows smoothly along the rotation direction of the intake fan without changing rapidly. Accordingly, the levels of the pressure noise, the collision noise, and the turbulent noise are greatly reduced.
In addition, since no sound absorbing material is provided at the intake port of the intake fan, the intake air flow rate of the intake fan caused by providing the sound absorbing material does not decrease, and the intake fan from the intake port such as dust of asbestos enters the intake fan. Since it can enter, it can be applied to dust collectors for dust such as asbestos.
Further, in the intake box, when a rectifying plate for adjusting the swirl flow is provided so that the air guided from the introduction pipe efficiently flows into the intake port of the intake fan, The generation of centrifugal force is prevented, and the air pressure at the center of the intake box does not decrease, so that the desired landscape and static pressure of the intake fan can be maintained.
The rectifying plate is provided at a position that prevents the body part from entering the intake port of the intake fan even if the body part inadvertently enters the inlet duct. If an operator inadvertently puts his / her hand into the introduction pipe in order to remove dust such as asbestos that has adhered to and accumulated on the rotor blades of the intake fan, there is no concern that the operator's hand will touch the rotor blades. Therefore, injuries caused by contact with the rotating blades can be prevented. In addition, since the current plate is used as a means for preventing a part of the body from entering the intake fan, the parts can be used effectively, and the number of parts can be reduced.
Further, the rectifying plate is constituted by a rectangular flat plate-like member, one end is connected in the vicinity of the connecting portion inside the introduction pipe line and the intake box, and the other end is curved in a direction along the swirl flow. When it is provided in a shape, it is possible to reliably prevent inadvertent hand intrusion while exhibiting an ideal rectifying effect.
In addition, according to the intake fan of the present invention, the rotating blade that rotates in the direction of taking in external air around the rotating shaft, the driving means that rotationally drives the rotating blade, the rotating blade is covered, and from the intake port A fan casing for guiding the inflowing air to the exhaust port, and the intake fan silencer according to any one of claims 1 to 3 is provided at the intake port of the intake fan. The air flowing into the fan casing from the intake port is smoothly transported along the swirl flow caused by the rotation of the rotating blades and guided to the exhaust port. Therefore, the level of the pressure noise, the collision noise, and the turbulent noise is remarkably reduced, and an intake fan with extremely low noise can be provided.
Also, according to the dust collector for asbestos and the like according to the present invention, the drum and air containing dust such as asbestos that is detachably attached to the drum passes from the inside to the outside, so that the dust such as asbestos is inside. A filter that is detachably attached to the drum, a bag body that contains dust such as asbestos that is detachably attached to the drum, and a filter that sucks air containing dust such as asbestos that is connected to the drum. An intake fan for pulverizing dust particles in the dust that is supplied and sucked into the intake fan is provided, and the intake fan silencer according to any one of claims 1 to 3 is provided at an intake port of the intake fan. Therefore, the noise is low, the necessary intake air flow rate of the intake fan can be secured, and the asbestos dust mass collides with the rotating blades. It is possible to provide a dust collector for dust such as asbestos that can be used safely and comfortably without worrying about injury even if the operator carelessly puts the hand inside the introduction pipe line without worrying about damage to the rotating blades. It becomes possible.

Hereinafter, the basic configuration and operation mode of an embodiment of the dust collector 1 for dust and the like of asbestos and the intake fan 11 according to the present invention will be described with reference to FIGS. 1 to 6, and then FIGS. 7 to 12. The specific configuration and operation of the intake fan silencer 61 according to the present invention, which is a characteristic configuration of the dust collector 1 for dust such as asbestos, will be described with reference to FIG.
(1) Basic configuration and operation mode of dust collector and dust fan for asbestos and the like The dust collector 1 for dust and the like of asbestos according to the present embodiment peels asbestos and the like from the wall or ceiling to which harmful substances such as asbestos are blown. It is used in the removal of asbestos, etc. to be removed, the collection work site, the demolition of buildings having walls and ceilings using the asbestos etc., the repair work site, etc. Further, a plurality of dust collectors 1 for dust such as asbestos are arranged at appropriate locations on the work site according to the size of the work site, and asbestos removal and recovery operations are executed.

The dust collector 1 for dust such as asbestos includes a drum 5 provided for the dust collector frame 3, a filter 7 provided detachably above the drum 5, and a bag body 9 provided detachably below the drum 5; And an intake fan 11 installed in the dust collector frame 3.
As shown in FIG. 5, the drum 5 is a short cylindrical member having an open upper surface and a bottom surface, and an inflow duct 15 extending in a tangential direction is provided at an appropriate position of the peripheral body portion 13.

  A circular opening 17 is provided on the upper surface of the drum 5 as an example when viewed from above, and serves as a communication port to the filter 7 provided above the drum 5. Further, two mounting cylinder portions having different diameters are provided concentrically on the bottom surface of the drum 5. The two mounting tube portions are constituted by a large tube portion 19 having a large diameter and a small tube portion 21 having a small diameter, and the length of the large tube portion 19 is short, and the length of the small tube portion 21 is longer than that of the large tube portion 19. It is formed so as to protrude.

The filter 7 is a bag-like member formed of felt as an example, and is detachably attached to the drum 5.
The filter 7 itself has a certain degree of shape retention, and can maintain an upright posture while attached to the drum 5. However, the dust collector 1 for dust such as asbestos shown in FIG. A gate-shaped suspension arm 23 is raised separately from the peripheral body portion 13 of the drum 5, and the filter 7 is suspended by a suspension hook 27 provided on the central lower surface of the horizontal portion 25 of the suspension arm 23. Thus, the standing posture of the filter 7 is maintained.
And this filter 7 has the function to hold | maintain and isolate | separate dust B, such as asbestos, on the inner side, when the air A containing the dust B, such as asbestos, passes from the inner side to the outer side.

  The bag body 9 is a bag-like member that accommodates dust B such as asbestos separated by the filter 7. The bag body 9 having a large diameter is attached to the large cylinder portion 19 of the drum 5 using a band or the like (not shown), and the bag body 9 having a small diameter is the same as the small cylinder portion 21 of the drum 5. It is attached using a band (not shown).

The intake fan 11 is a member that sucks air A containing dust B such as asbestos and supplies the air A into the filter 7. In the present embodiment, the intake fan 11 also has a function of pulverizing the dust mass G contained in the sucked dust B.
Specifically, the intake fan 11 is configured as an example by a plate fan in which a plurality of plate-like rotary blades 29 are arranged radially, and each rotary blade 29 has an edge for pulverizing the dust mass G. A part 31 is provided.
In the illustrated embodiment, the shape of the edge portion 31 of the intake fan 11 is relatively large (for example, at an acute angle) linearly inclined toward the inner side of the center.

The intake fan 11 is driven by a motor 33 which is an example of drive means provided on the back side of the intake fan 11, and a short cylinder is formed around the intake fan 11 so as to cover the intake fan 11. A fan casing 37 having a shape in which the shaped member is tilted sideways is provided.
A circular intake port 35 is formed substantially at the center of the front surface of the fan casing 37, and an intake fan silencer 61 of the present invention, which will be described later, is connected to the intake port 35. Further, an exhaust port 38 is provided at the upper surface corner of the fan casing 37, and a relay duct 39 connected to the inflow duct 15 of the drum 5 is provided toward the tangential upper side of the fan casing 37.

Further, a suction pipe 41 is detachably attached to the intake side of the intake fan silencer 61 of the present invention. The suction piping device 41 includes a cylindrical piping portion 43 that is bent 90 ° upward, and a suction portion 45 that is provided in a trumpet shape and is provided upward at the tip of the piping portion 43. The pipe portion 43 is configured, for example, in a bellows shape so that it can be extended to near the top, so that the suction portion 45 can be extended and arranged near the top. It is configured.
A silencer 49 is attached in the middle of the relay duct 39 provided on the exhaust side of the intake fan 11.

Various members including the drum 5, the filter 7, the bag body 9, and the intake fan 11 are installed on a movable carriage 51. The movable carriage 51 includes a flat plate-like mounting portion 53 provided in a horizontal state, four casters 55 provided one by one in the corner portion of the bottom surface of the mounting portion 53, and the intake fan 11 side of the above-described mounting portion 53. And a gate-shaped moving handle 57 which is raised from the upper surface near the edge.
In addition, a control box 58 is provided on the side surface of the silencer 49 provided in the middle of the relay duct 39 for switching between starting and stopping, adjusting the intake air amount of the intake fan 11, and the like.

Next, an operation mode of the dust collector 1 for dust such as asbestos according to the present embodiment configured as described above will be described.
The lid of the control box 58 is opened, the switch 59 in the control box 58 is pressed, the intake fan 11 is started, and the intake air amount of the intake fan 11 is set to a predetermined value. As a result, the rotary blades 29 of the intake fan 11 rotate at high speed. Then, as shown in FIG. 1, the worker holds the suction part 45 with one hand, peels off the asbestos while using the work tool with the other hand, and drops and sucks it into the suction part 45. . A part of the asbestos dust mass G peeled off from the ceiling and the wall by the work and the air A containing the asbestos dust B floating in the work space are invented via the suction part 45 and the piping part 43. The suction fan silencer 61 and the intake fan 11 are sucked in vigorously.

The asbestos dust mass G that has reached the intake fan 11 collides with the edge portion 31 of the rotary blade 29 of the intake fan 11 and is pulverized to become fine dust B, together with the other dust B and air A, the relay duct 39, the inflow duct. 15 is transferred into the drum 5.
The air A containing the asbestos dust B transferred into the drum 5 is blown upward as a spiral swirl flow from the drum 5 toward the upper filter 7, and the dust B is centrifuged and dropped. At the same time, only the air A collected by the filter 7 and from which the dust B has been removed passes through the filter 7 and is discharged from the inside of the filter 7 to the outside.
On the other hand, the asbestos dust B collected by the filter 7 falls downward and is accommodated and collected in the bag 9 attached to the mounting cylinders 19 and 21 below the drum 5.

(2) Specific configuration and operation mode of the intake fan silencer The intake fan silencer 61 according to the present embodiment includes a large-diameter cylindrical intake box 63 connected to the intake port 35 of the intake fan 11. And a cylindrical introduction pipe 67 having a small diameter connected to the peripheral body 65 of the intake box 63 so as to extend in a tangential direction. Then, the air A including the dust B and the like guided into the introduction pipe 67 flows along the inner wall surface 69 in the peripheral body portion 65 of the intake box 63 and becomes a swirl flow in the same direction as the rotation direction of the intake fan 11. It is configured to flow into the air inlet 35 of the fan 11.

Further, a rectifying plate 71 is provided in the intake box 63 for adjusting the swirling flow so that the air A guided from the introduction pipe 67 flows into the intake port 35 of the intake fan 11 efficiently. The rectifying plate 71 is constituted by a member having a rectangular flat plate shape as an example, one end is connected in the vicinity of the connecting portion inside the inlet pipe 67 and the intake box 63, and the other end is in a direction along the swirl flow. It has a curved shape.
Further, by providing the current plate 71 at the above site, even if an operator inadvertently puts a part of the body, for example, a hand into the introduction pipe 67, the current plate 71 is obstructed and the intake fan 11 It cannot enter the air inlet 35.

When air A containing dust B is introduced into the inlet duct 67 of the intake fan silencer 61 having such a configuration, the air A is passed through the inner wall surface 69 of the peripheral body 65 of the intake box 63 and the air Guided by the rectifying plate 71, a swirl flow along the rotation direction of the intake fan 11 is supplied into the intake port 35 of the intake fan 11.
Therefore, pressure noise generated by a sudden pressure fluctuation at the center of the fan casing 107, collision noise generated when the air A collides with the rotary blades 29 from a right angle direction, and turbulent noise generated by turbulence and vortex flow. It becomes much smaller.

  Further, since no sound absorbing material is provided at the intake port 35 of the intake fan 11, the intake air flow rate of the intake fan 11 caused by providing the sound absorbing material does not decrease. Further, by providing the rectifying plate 71 in the intake box 63, the centrifugal force is prevented from being generated in the intake box 63, and the air pressure at the central portion of the intake box 63 is not lowered. Static pressure is maintained. Further, even if the worker puts his hand into the introduction pipe 67 in order to remove the dust B such as asbestos adhering to and accumulating on the rotary blades 29 of the intake fan 11, the rectifying plate 71 gets in the way and goes deeper than that. Since the hand cannot be put in, contact with the rotary blade 29 does not occur.

Table 1 below shows the results of tests conducted to compare the silencing effect of the conventional intake fan silencer and the intake fan silencer according to the present invention. In this test, a plate fan type intake fan is used, and a 3.7kw motor is used to measure the muffle level at a distance of 1 m from the noise source separately for each center frequency, and the difference between the two is obtained. And verified the silencing effect.
As is apparent from Table 1, the silencer 61 for the intake fan of the present invention has a higher noise reduction effect in most center frequency bands, and a remarkable effect is recognized particularly in a high center frequency band of 8 kHz or higher.

The present invention is not limited to the embodiment described above.
For example, the silencer 61 for the intake fan of the present invention is not limited to the intake fan 11 used in the dust collector 1 for dust such as asbestos, but for various types of intake fans 11 used for various applications. It is applicable. Further, the diameter of the inlet pipe 67 and the intake box 63 or the curvature of the curved portion of the rectifying plate 71 can be changed as appropriate, and the optimum diameter or the diameter of the dust B contained in the air A and the size of the dust mass G can be changed. It is possible to change to curvature.

  The present invention can be used in the fields of use and manufacturing of various types of intake fans used in various applications, and in particular, removes and collects harmful dust such as asbestos blown on the ceiling and walls. It has applicability when you want to use dust collectors for dust such as asbestos used at work sites comfortably and safely.

It is a figure which shows one embodiment of this invention, and is a perspective view which shows the use condition of dust collectors, such as asbestos dust. It is a figure which shows one embodiment of this invention, and is a perspective view which shows the dust collector for dusts, such as asbestos. It is a figure which shows one embodiment of this invention, and is a front view which shows the dust collector for dusts, such as asbestos. It is a figure which shows one embodiment of this invention, and is a right view which shows the dust collector for dusts, such as asbestos. It is a figure which shows one embodiment of this invention, and is a perspective view which shows a drum. It is a figure which shows one embodiment of this invention, and is an enlarged view of an intake fan periphery. It is a figure which shows one embodiment of this invention, and is a perspective view which shows the silencer for intake fans. It is a figure which shows one embodiment of this invention, and is a top view which shows the silencer for intake fans. It is a figure which shows one embodiment of this invention, and is a rear view which shows the silencer for intake fans. It is a figure which shows one embodiment of this invention, and is a left view which shows the silencer for intake fans. It is a figure which shows one embodiment of this invention, and is a right view which shows the silencer for intake fans. It is a figure which shows one embodiment of this invention, and is the front sectional view (a) which shows typically the structure of the silencer for intake fans, and a side sectional view (b). It is a figure which shows a prior art example, and is the front sectional view (a) which shows typically the structure of the silencer for intake fans, and a side sectional view (b).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dust collector for dust, such as asbestos 3 Dust collector frame 5 Drum 7 Filter 9 Bag body 11 Intake fan 13 Circumferential trunk part 15 Inflow duct 17 Opening part 19 Large cylinder part (mounting cylinder part)
21 Small cylinder part (mounting cylinder part)
23 suspension arm 25 horizontal portion 27 suspension hook 29 rotary blade 31 edge portion 33 motor (drive means)
35 Intake port 37 Fan casing 38 Exhaust port 39 Relay duct 41 Suction piping 43 Piping part 45 Suction part 49 Silencer 51 Moving carriage 53 Mounting part 55 Casters 57 Moving handle 58 Control box 59 Switch 61 Intake fan silencer 63 Intake box 65 Circumferential body 67 Introduction pipe 69 Inner wall surface 71 Rectifying plate A Air B Dust G Dust lump

Claims (6)

A cylindrical intake box connected to the intake port of the intake fan;
An introduction conduit connected so as to extend in a tangential direction with respect to the peripheral body portion of the intake box,
The air containing dust or the like introduced into the introduction pipe flows along the inner wall surface of the peripheral body portion of the intake box, and flows into the intake port of the intake fan as a swirling flow in the same direction as the rotation direction of the intake fan. A silencer for an intake fan, characterized by being configured as described above. The silencer for an intake fan according to claim 1,
A silencer for an intake fan, characterized in that a rectifying plate for adjusting the swirl flow is provided in the intake box so that the air guided from the introduction pipe efficiently flows into the intake port of the intake fan. In the silencer for intake fans according to claim 2,
The rectifying plate is provided at a position that prevents the body part from entering the intake port of the intake fan even if the body part inadvertently enters the introduction duct. Silencer for intake fans. The silencer for an intake fan according to claim 3,
The rectifying plate is constituted by a member having a rectangular flat plate shape, and one end is connected to the vicinity of the connection portion inside the intake pipe and the intake box, and the other end is curved in a direction along the swirl flow. Silencer for intake fans, characterized by being provided. A rotating blade that rotates in the direction of taking in external air around the rotation axis;
Drive means for rotationally driving the rotary blade;
In the intake fan that covers the rotary blade and includes a fan casing that guides the air flowing from the intake port to the exhaust port,
An intake fan, wherein an intake fan silencer according to any one of claims 1 to 4 is provided at an intake port of the intake fan. Drums,
A filter that detachably attaches to the drum and sucks air containing dust such as asbestos, so that dust such as asbestos is separated inside by passing from the inside to the outside;
A bag body for storing dust such as asbestos, which is detachably attached to the drum and separated by the filter;
In a dust collector for dust such as asbestos, which is connected to the drum and sucks air containing dust such as asbestos and supplies the air into the filter and an intake fan that pulverizes a dust mass in the sucked dust.
A dust collector for dust such as asbestos, wherein the intake fan silencer according to any one of claims 1 to 4 is provided at an intake port of the intake fan.

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