JP2012207618A - Outdoor blower with sound-absorbing box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that, in a conventional blower with a sound-absorbing box, workability, and maintainability such as confirmation of deterioration of sound-absorbing materials in a narrow space under a roof and above a ceiling, are poor, and a sound attenuation space of the sound-absorbing box is not enough, thereby the blower is noisy.SOLUTION: In front of a body outlet 7 in the ventilation direction, a sound insulation hood panel 24 is provided which has a sound insulation plane whose area is larger than that of the body outlet 7. A space provided between the body outlet 7 and the sound insulation hood panel 24 serves as a discharged air path 26, and an opening of an end thereof serves as a hood outlet 27a. A body 5 is fixed on a floor 28 using an installation pedestal 29. The hood outlet 27a is opened toward a floor 28 side. As a result, an outdoor blower with a sound-absorbing box is provided which can reduce noise while improving the workability and maintainability.

Description

  TECHNICAL FIELD The present invention relates to a blower with an outdoor type silencing box having a discharge silencing structure that is used by incorporating a blower inside a silencing box such as a ventilation fan.

  Conventionally, as the discharge silencing structure, the silencing performance has been improved by providing a silencing air passage and a large silencing discharge chamber on the discharge side of the blower.

(Conventional example 1)
A conventional fan with a sound deadening box is installed by being embedded in a ceiling, and a sound absorbing material is attached to an exhaust duct or an outdoor hood.

  The conventional example will be described below with reference to FIG.

  As shown in FIG. 5, a conventional blower 101 with a sound deadening box is embedded in a ceiling 102, and a protective net 107 is attached to the exhaust port 106 of the outdoor 105 where the exhaust duct 104 connected to the airframe outlet 103 is extended. An outdoor hood 108 is provided. In such a fan 101 with a sound deadening box, in order to prevent the noise of the airflow discharged from the built-in centrifugal fan 109 from being transmitted to the living area in the vicinity of the outdoor 105, the sound absorption 110 is attached inside the exhaust duct 104. The sound absorbing material 111 is attached inside the outdoor hood 108 to cope with this. When the centrifugal blower 109 is stopped, the protective net 107 prevents foreign matter and birds from entering the outdoor 105.

(Conventional example 2)
In addition, there has been known one in which a muffler blowing chamber having a large number of turns while increasing the air passage distance from the discharge port to the discharge port is provided at the discharge port of the blower. (For example, refer to Patent Document 1).

  The conventional example will be described below with reference to FIG.

  As shown in FIG. 6, there is a wind outlet 206 that connects the wind inlet 203 to the discharge port 202 side of the centrifugal blower 201 and directs the wind direction 205 in a direction orthogonal to the wind direction 204 at the wind inlet 203. The wind direction 205 collides with the outer wind path 207 and becomes a wind direction 209 in which the wind blows out from the outlet 208 after making a U-turn by 180 degrees. In such a centrifugal blower 201, the airflow from the discharge port 202 is prevented from being propagated to the outside by increasing the air path distance to the blower outlet 208 and increasing the number of turns.

(Conventional example 3)
In addition, it is known that a sound deadening chamber having a bellows shape is provided at the discharge port of the blower while elongating the air passage distance from the discharge port to the discharge port inside the sound absorbing material casing. (For example, refer to Patent Document 2).

  The conventional example will be described below with reference to FIG.

  FIG. 7 shows that a centrifugal blower 302 having a bellows air passage 305 connected therein is provided inside a sound absorbing material casing 301. The bellows air passage 305 is formed of a sound absorbing material 304 and is connected to the discharge port 303 side of the centrifugal blower 302. A wind direction 306 from the discharge port 303 is a curved airflow 307 along the bellows air passage 305. In such a centrifugal blower 302, the airflow emitted from the centrifugal blower 302 is absorbed along the sound absorbing material 304 by the curved airflow 307, and the sound that cannot be absorbed by the sound absorbing material casing 301 is absorbed outside by the sound absorbing material casing 301. Noise transmission is prevented.

(Conventional example 4)
In addition, there is known a structure in which a silencer blowing chamber of an L-shaped air passage formed of a punching opening plate and a sound absorbing material is provided in a discharge port of a blower inside the housing. (For example, refer to Patent Document 3).

  The conventional example will be described below with reference to FIG.

  FIG. 8 shows a centrifugal fan 402 having an L-shaped air passage 405 connected to the inside of the housing 401. The L-shaped air passage 405 is formed by a punching opening plate 406 and a sound absorbing material 407, and a bent portion 404 is provided at a right angle on the discharge port 403 side of the centrifugal blower 402. The airflow 408 from the discharge port 403 becomes a curved airflow 409 along the L-shaped air path 405. In such a centrifugal blower 402, the airflow from the discharge port 403 releases the noise that could not be absorbed into the housing 401 while the curved airflow 409 absorbs sound along the punching opening plate 406 and the sound absorbing material 407. This prevents noise transmission to the outside.

JP 2003-194392 A JP 2006-291743 A JP-A-7-91728

  Such a conventional blower with a sound deadening box is supported by attaching a sound absorbing material inside the exhaust duct or by attaching a sound absorbing material inside the outdoor hood. There are problems such as poor maintainability such as deterioration confirmation, and insufficient noise reduction space inside the outdoor hood and high noise. In addition, the protective net is installed on an outdoor wall surface, and there is a problem that the attachment / detachment maintenance property during clogging cleaning is poor.

  In addition, the above-described silencer blowing chamber requires a complicated and long silencer air passage, and has a problem of being difficult to construct and maintain because it has a large shape. Also, when installing additional protection nets, the airway structure is complicated, so if maintenance is given priority, the protection net will be placed at the end of the silencer airflow path and will become increasingly large.

  The present invention solves such a conventional problem, and integrates a hood provided with a silencing function and a protective net in a blower with an outdoor type silencing box and installs it outdoors to improve workability and maintainability. An object is to provide an air blower with an outdoor type silencing box that can reduce noise.

  In order to achieve the above object, the blower with the outdoor type silencing box of the present invention forms a box-shaped body by connecting the opposed body opening surfaces at the top, bottom and side surfaces of the body, A suction port and a fuselage outlet are opposed to each other and provided on the opening surface of the fuselage, and a centrifugal blower is provided inside the fuselage. The centrifugal blower has a discharge port, a spiral scroll, and a casing suction port facing the fuselage blower. A fan casing in which the provided casing side plate is arranged on a side surface, and a sound insulation hood panel having a sound insulation plane larger than an area of the airframe outlet is provided on the front side in the ventilation direction of the airframe outlet, The space provided between the sound insulation hood panels is the discharge air passage, the opening at the end is the hood air outlet, the machine body is fixed to the floor with an installation stand, and the hood air outlet is opened toward the floor. It is obtained by the configuration.

  According to the present invention, the airframe opening surface facing the airframe is connected to the airframe top surface, the airframe bottom surface, and the airframe side surface to form a box-shaped airframe, and the airframe suction port and the airframe outlet are opposed to each other to open the airframe opening. A centrifugal blower is provided in the airframe, and the centrifugal blower includes a fan casing in which a discharge port facing the fuselage outlet, a spiral scroll, and a casing side plate provided with a casing suction port are arranged on a side surface. A sound insulation hood panel having a sound insulation plane larger than the area of the airframe outlet is provided in front of the airflow direction of the airframe outlet, and a space provided between the airframe outlet and the sound insulation hood panel is discharged from the airflow. As the road, the opening at the end is used as a hood air outlet, the airframe is fixed to the floor with an installation stand, and the hood air outlet is opened toward the floor surface. As a result, the sound insulation hood panel can be fixed to the machine body and integrated, and the noise of the discharge airflow of the centrifugal blower propagating to the hood outlet can be reduced while installing the machine body and having the noise reduction of the discharge airflow at the same time. Since it is shielded by the sound insulation hood panel, it has the effect of suppressing the release of noise to the outdoors. As a result, it is possible to provide a blower with an outdoor type silencing box that has the effect of reducing noise while improving workability and maintainability.

Side view of blower with outdoor type silencing box of Embodiment 1 of the present invention Front view of blower with outdoor sound deadening box Side view showing the installation state of the outdoor blower with silencer box Plan sectional view of the blower with outdoor type silencer box Side view of the fan with a silencing box embedded in the ceiling of Conventional Example 1 Side view of the sound deadening chamber of Conventional Example 2 Plan view of the silencer blowing chamber of Conventional Example 3 Side view of the silencer blowing chamber of Conventional Example 4

  The blower with an outdoor type silencing box according to claim 1 of the present invention forms a box-shaped body by connecting the opposed body opening surfaces with the body top surface, the body bottom surface, and the body side surface, and the body suction port. A casing provided with a blower opening facing the fuselage opening and provided with a centrifugal blower inside the fuselage, wherein the centrifugal blower is provided with a discharge port facing the fuselage blower outlet, a spiral scroll, and a casing suction port. A fan casing having a side plate arranged on a side surface is provided, and a sound insulation hood panel having a sound insulation plane larger than an area of the airframe outlet is provided in front of the airflow direction of the airframe outlet, and the airframe outlet and the sound insulation hood are provided. A configuration in which a space provided between the panels is used as a discharge air passage, a terminal opening is a hood air outlet, the machine body is fixed to a floor surface with an installation stand, and the hood air outlet is opened toward the floor surface side. To have. As a result, the sound insulation hood panel can be fixed to the machine body and integrated, and the noise of the discharge airflow of the centrifugal blower propagating to the hood outlet can be reduced while installing the machine body and having the noise reduction of the discharge airflow at the same time. Since it is shielded by the sound insulation hood panel, it has the effect of suppressing the release of noise to the outdoors. As a result, noise can be reduced while improving workability and maintainability.

  In addition, the cross-sectional area of the discharge air passage in the space between the sound insulation hood panel and the protective mesh is configured to be larger than the opening area of the discharge opening, and the cross-sectional area of the discharge air passage leading from the discharge opening to the sound insulation hood panel. Therefore, the flow velocity of the airflow is gradually reduced from the discharge port to prevent the generation of turbulent noise, so that the noise can be reduced.

  In addition, the sound insulation hood panel has a box shape consisting of a plurality of planes, and a ventilation opening is provided in a plane other than the sound insulation plane. Since the pressure loss of the sound-insulating hood panel is reduced by discharging, the flow velocity of the airflow is gradually reduced from the discharge port to prevent the generation of turbulent noise, so that the noise can be reduced.

  In addition, the sound absorbing material is affixed to the inner surface of the sound insulation hood panel, and since the surface area of the sound absorbing material can be secured in the discharge air passage, it is easy to absorb noise from the discharge port. Therefore, noise can be reduced.

  In addition, the protective mesh and sound insulation hood panel can be attached to and removed from the fuselage by screwing, and the protective mesh and sound insulation hood panel can be removed for maintenance. Can be secured.

  Further, a rectifying plate for dividing the discharge air passage is provided between the protective mesh and the sound insulation hood panel, the rectifying plate is inclined in the rotational direction of the impeller from the protective mesh toward the sound insulation hood panel, and the sound absorbing material is provided on the rectifying plate. The airflow from the centrifugal blower that tends to tilt in the direction of rotation of the impeller is absorbed while being divided without colliding with the rectifying plate, so that the noise can be reduced. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIG. 1 and FIG. 2, the blower with an outdoor sound deadening box of the present embodiment includes a centrifugal blower 8 inside a box-shaped airframe 5 having a body air inlet 6 and a body air outlet 7. 7, a protection net 22 is covered and a sound insulation hood panel 24 is provided so as to cover the protection net 22. The airframe 5 is formed in a box shape by connecting the opposing airframe opening surface 1 with the airframe top surface 2, the airframe bottom surface 3, and the airframe side surface 4. And the airframe inlet port 6 and the airframe outlet 7 are provided in the airframe opening surface 1 which opposes. The centrifugal blower 8 is provided with a fan casing 13 in which a discharge port 9 facing the fuselage outlet 7, a spiral scroll 10 and a casing side plate 12 provided with a casing suction port 11 are arranged on the side surface. The impeller 14 inside the centrifugal blower 8 is driven by a motor 15. And the airframe 21 is provided in the protection net | network 22 so that the airflow 21 may cover from the outdoor 20 side so that ventilation is possible. Furthermore, a sound insulation hood panel 24 having a sound insulation plane 23 that covers the protection net 22 and is larger than the area of the protection net 22 when viewed from the air outlet 7 side is provided on the front surface facing the protection net 22 in the ventilation direction. Fix to the fuselage 5. That is, the sound insulation hood panel 24 is provided so as to cover the protective net 22 so that the airflow 21 blown out from the airframe outlet 7 collides. The space provided between the protective mesh 22 and the sound insulation hood panel 24 is a discharge air passage 26, and the opening at the end of the sound insulation hood panel 24 is a hood outlet 27a. The airframe 5 is fixed to the floor surface 28 with an installation stand 29. That is, the discharge air passage 26 is in a state directed toward the floor surface 28 side. The sound insulation hood panel 24 is a plate body formed in an L shape with a collision surface (sound insulation plane 23) and a top surface (hood top surface 24 b) facing the air outlet 7, and a discharge air passage 26 at a side end thereof. It is the shape which provided the wall (hood side surface 24c) which forms. A sound absorbing material 35 is affixed to the inner surface of the sound insulation hood panel 24. The discharge air passage 26 flows out from a hood outlet 27a formed on the side facing the hood top surface 24b and a side opening 27b formed on the hood side surface 24c. Further, the opening area of the hood outlet 27 a of the discharge air passage 26 is larger than the opening area of the discharge port 9 provided in the machine body 5.

  Further, the discharge port 9 of the machine body 5 is covered with a protective net 22 and fixed to the machine body 5 with screws 36. The sound insulation hood panel 24 is fixed to the machine body 5 with screws 37 so as to be detachable.

  In such a configuration, when the centrifugal blower 8 is operated, as shown in FIG. 3, the air in the room 30 is sucked from the suction side duct 31, passes through the centrifugal blower 8 of the body 5, and protects the body outlet 7. The air is exhausted from the hood outlet 27a and the side opening 27b to the outdoors 20 through the net 22. When the centrifugal blower 8 is stopped, such as when ventilation is unnecessary at night, the protective net 22 prevents foreign objects and birds from entering.

  According to the above configuration, the sound insulation hood panel 24 can be fixed to the airframe 5 and can be constructed integrally, so that the hood air outlet 27a and the side opening can be provided while the airframe 5 is installed and constructed, and at the same time, there is a countermeasure for silencing the discharged airflow. Since the noise of the discharge airflow of the centrifugal blower 8 propagating to 27b is shielded by the sound insulation hood panel 24, the noise is prevented from being released to the outdoors 20. This arrangement effectively arranges the sound insulation hood panel 24 in response to the noise of the centrifugal blower 8 being released toward the front of the discharge port 9. In addition, when an air blower with an outdoor type sound deadening box is installed on the floor surface 28 of the outdoors 20, the noise emitted through the discharge air passage 26 is the body of the air blower body with the floor surface 28 and the outdoor type sound deadening box. There is also an effect that the collision between the bottom surfaces 3 is attenuated, which is advantageous for noise reduction.

  Further, by making the cross-sectional area of the discharge air passage 26 larger than the opening area of the discharge port 9, the cross-sectional area of the discharge air passage 26 leading from the discharge port 9 to the sound insulation hood panel 24 is not reduced. The flow velocity gradually becomes gentle from the discharge port 9 to prevent the generation of turbulent noise.

  Further, the sound insulation hood panel 24 is provided with ventilation openings (hood outlet 27a, side opening 27b) on a plane other than the sound insulation plane 23, so that the noise from the discharge port 9 is insulated and the ventilation opening is provided. The discharged air flow 34 is discharged from the air. Therefore, the pressure loss of the sound insulation hood panel 24 is reduced, and the flow velocity of the airflow is gradually reduced from the discharge port 9 to prevent the generation of turbulent noise.

  In addition, by attaching the sound absorbing material 35 to the inner surface of the sound insulating hood panel 24, it is possible to secure a large surface area of the sound absorbing material 35 in the discharge air passage 26, so that noise from the discharge port 9 can be easily absorbed.

  Further, by fixing the sound insulation hood panel 24 and the protection net 22 with screws, the sound insulation hood panel 24 and the protection net 22 can be removed and maintained.

  Thus, according to the blower with an outdoor type silencing box of Embodiment 1 of the present invention, noise can be reduced while improving workability and maintainability.

(Embodiment 2)
As shown in FIG. 4, a rectifying plate 40 that divides the discharge air passage 26 is provided between the protective mesh 22 and the sound insulation hood panel 24. The rectifying plate 40 is inclined in the rotational direction (arrow A) of the impeller 14 from the protective mesh 22 toward the sound insulation hood panel 24. In other words, as shown in FIG. 4, it is inclined in the same direction as the inclination of the scroll 10 from the tongue 43 of the fan casing 13 of the centrifugal blower 8 toward the discharge port 9. In addition, the sound absorbing material 42 is attached to the current plate 40, and the sound absorbing material 35 is attached to the sound insulating hood panel 24.

  According to such a configuration, the air flow 21 from the centrifugal blower 8 that generally tends to tilt in the rotational direction of the impeller 14 is oriented almost parallel to the rectifying plate 40. The sound is absorbed while being divided without colliding with 40.

  Thus, according to the blower with an outdoor type silencing box of Embodiment 2 of the present invention, noise can be reduced.

  In addition to the purpose of air conveyance such as ventilation blower equipment, the equipment can be cooled using the exhaust structure, and can be applied to the use of equipment equipment that can be installed compactly.

DESCRIPTION OF SYMBOLS 1 Aircraft opening surface 2 Aircraft top surface 3 Aircraft bottom surface 4 Aircraft side surface 5 Airframe 6 Aircraft suction port 7 Aircraft air outlet 8 Centrifugal blower 9 Discharge port 10 Scroll 11 Casing suction port 12 Casing side plate 13 Fan casing 14 Impeller 15 Motor 20 Outdoor 21 Airflow 22 Protective net 23 Sound insulation plane 24 Sound insulation hood panel 26 Discharge air passage 27a Hood outlet 27b Side opening 28 Floor 29 Installation stand 35 Sound absorbing material 36 Screw 37 Screw 40 Current plate 41 Rotating direction 42 Sound absorbing material

Claims (7)

The opposed airframe opening surface is connected to the airframe top surface, the airframe bottom surface, and the airframe side surface 2 to form a box-shaped airframe, and the airframe suction port and the airframe air outlet are provided facing each other on the airframe opening surface. The centrifugal blower includes a fan casing in which a casing side plate provided with a discharge port, a spiral scroll, and a casing suction port facing the fuselage outlet is arranged on a side surface.
A sound insulation hood panel having a sound insulation plane larger than the area of the airframe outlet is provided on the front side of the airflow direction of the airframe outlet.
The space provided between the airframe outlet and the sound insulation hood panel is a discharge air passage, and the terminal opening is a hood outlet.
The aircraft is fixed on the floor with an installation stand,
An air blower with an outdoor type silencing box, wherein the hood air outlet is opened toward the floor surface. The blower with an outdoor type silencing box according to claim 1, wherein a cross-sectional area of the discharge air passage is configured to be larger than an opening area of the discharge port. The blower with an outdoor type sound deadening box according to claim 1 or 2, wherein the sound insulation hood panel has a box shape composed of a plurality of planes and is provided with a ventilation opening in a plane other than the sound insulation plane. The blower with an outdoor type sound deadening box according to any one of claims 1 to 3, wherein a sound absorbing material is attached to an inner surface of the sound insulation hood panel. The blower with an outdoor type sound deadening box according to any one of claims 1 to 4, wherein the protective net and the sound insulation hood panel are configured to be detachable by screw fixing to the airframe. 6. A rectifying plate that divides the discharge air passage is provided in the discharge air passage, and the rectifying plate is inclined in the rotational direction of the impeller from the protective mesh toward the sound insulation hood panel. A blower with an outdoor type silencing box according to any one of the above. The air blower with an outdoor sound deadening box according to claim 6, wherein a sound absorbing material is attached to the current plate.

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