JP2010236538A - Blower with noise absorbing box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blower with a noise absorbing box, which reduces noise of a high-frequency band, and controls the performance deterioration due to rapid expansion of wind path, when the noise absorbing chamber is provided in the blower discharge opening to suppress the noise. <P>SOLUTION: The blower with a noise absorbing box includes the centrifugal blower 9 inside of the box-shaped machine body 3, the inside of the machine body 3 is divided into the machine body blowing opening 2 side and the machine body intake opening 1 side in the air trunk 8 of the inside of the machine body 3, and the noise absorbing chamber 16 is provided between the machine body blowing opening 2 and the blower discharge opening 1. The guide cylinder 19 from the blower discharge opening 12 toward the machine body blowing opening 2 is formed by a noise absorbing material in the noise absorbing chamber 16, and the air layer is provided between the guide cylinder 19 and the machine body 3. With the construction above, any noise of both low- and high-frequency bands at the blower discharge opening 12 is reduced without lowering the blowing performance. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a blower with a sound deadening box used for ventilation for supplying air through a duct from outside to inside such as a ventilation fan.

  As this type of fan with a sound deadening box, an exhaust duct fan that exhausts air from the room to the outside through a duct is known (for example, see Patent Document 1). The conventional example shown here is a case where it is used for air supply, and as a method for reducing noise on the air supply side, there is a method of reducing sound by providing a sound absorbing material provided on the airframe suction port on the air supply side. . In addition, a method is known in which a sound absorbing material is disposed between the discharge port of the built-in blower and the airframe to reduce noise on the air supply side (see, for example, Patent Document 2).

  Hereinafter, the blower with the sound deadening box will be described with reference to FIGS. 10, 11, and 12.

  In Patent Document 1, as shown in FIG. 10, a centrifugal blower 102 is built in a box-shaped airframe 101, and a sound-absorbing material 106 is attached to a suction-side adapter 104 connected to the airframe suction port 103 and an inner wall surface 105 of the airframe 101. This is an exhaust duct fan in which the sound is reduced on the airframe inlet 103 side. A method of moving this sound reduction function to the supply side can be considered. As shown in FIG. 11, a space 109 is provided between the fuselage outlet 107 and the centrifugal blower outlet 108, and a sound absorbing material 112 is disposed on the blowout side adapter 110 and the inner wall surface 111 of the space 109 to supply air. The side is designed to reduce noise.

  In Patent Document 2, as shown in FIG. 12, a centrifugal blower 102 is built in a box-shaped body 101, and a sound absorbing material 113 is disposed between the centrifugal blower outlet 108 and the body 101 to supply air. The side is designed to reduce noise.

Japanese Patent Laid-Open No. 10-73304 JP-A-10-288198

  In the conventional sound reduction method as shown in FIG. 11, when the space portion 109 is provided in order to reduce the sound on the centrifugal blower outlet 108 side, the sound reduction effect of the low and medium frequency band noise is obtained by the space portion 109. However, there are problems that it is difficult to reduce noise in the high frequency band, and that the air blowing function is greatly reduced due to the sudden expansion of the air path. Further, the method as shown in FIG. 12 has a problem that the shape of the sound absorbing material 113 is complicated and expensive.

  The present invention solves such a conventional problem, and by devising the structure from the discharge port of the centrifugal blower to the fuselage blowout port, the high frequency at the centrifugal blower discharge port without reducing the blowing capacity. An object of the present invention is to provide a blower with a sound deadening box that reduces the noise of the belt.

  In order to achieve the above object, a blower with a sound deadening box according to the present invention includes a centrifugal blower inside a box-shaped body provided with a body suction port and a body blower outlet facing each other, and the centrifugal blower is provided with the body blower outlet. A blower with a sound deadening box provided with a discharge side, a spiral scroll and a casing side plate provided with a casing suction port, wherein the fuselage has a silencer chamber on the fuselage outlet side and a blower side on the fuselage suction port side. The blower chamber is divided into two by a discharge port panel connected to the discharge port of the centrifugal blower, the centrifugal blower is arranged in the blower chamber, and the discharge port panel includes an opening communicating with the discharge port. The opening and the air blower outlet are connected by a guide tube formed of a sound absorbing material, and an air layer is provided in the silencer chamber between the airframe and the guide tube.

  According to the present invention, a centrifugal blower is provided inside a box-shaped airframe that is provided with a fuselage suction port and a fuselage air outlet facing each other, and the centrifugal blower has a discharge port that faces the airframe blowout port, a spiral scroll, and the like. A blower with a silencer box provided with a casing side plate provided with a casing suction port, wherein the fuselage has a silencer chamber on the fuselage outlet side and a blower chamber on the fuselage suction port side, and a discharge port of the centrifugal blower The centrifugal blower is disposed in the blower chamber, and the discharge port panel includes an opening communicating with the discharge port. The opening and the air blower outlet are: By connecting with a guide cylinder formed of a sound absorbing material, and in the silencer chamber, an air layer is provided between the fuselage and the guide cylinder, so that the air blowing outlet at the fuselage outlet is not reduced. Can reduce high frequency noise It is possible to provide the fan with the sound deadening box having the effect of.

Side structure diagram of fan with silencer box according to Embodiment 1 of the present invention Front view of the fan with the sound deadening box Side structure diagram showing the installation state of the blower with the sound deadening box Side structure diagram of fan with silencer box according to embodiment 2 of the present invention Front configuration diagram of a fan with a sound deadening box according to a third embodiment of the present invention Plane | planar block diagram of the air blower with a silencer box of Embodiment 4 of this invention The perspective block diagram of the air blower with a silencer box of Embodiment 5 of this invention The perspective block diagram of the air blower with a silencer box of Embodiment 6 of this invention Side structure diagram of fan with silencer box according to embodiment 7 of the present invention Plan view of conventional blower with silencer box Plan view of conventional blower with silencer box Side view of a conventional fan with a sound deadening box

  The blower with a sound deadening box according to claim 1 of the present invention is provided with a centrifugal blower inside a box-shaped airframe provided with the airframe suction port and the airframe air outlet facing each other, and the centrifugal air blower faces the airframe air outlet. A blower with a silencer box provided with a casing side plate provided with a discharge port, a spiral scroll and a casing suction port, wherein the fuselage includes a silencer chamber on the fuselage outlet side, a blower chamber on the fuselage suction port side, The centrifugal blower is divided into two by a discharge port panel connected to the discharge port of the centrifugal blower, the centrifugal blower is disposed in the blower chamber, and the discharge port panel includes an opening communicating with the discharge port. And the fuselage outlet are connected by a guide tube formed of a sound absorbing material, and the silencer chamber has an air layer provided between the fuselage and the guide tube. Double formed guide tube and air layer Noise can be reduced in the high frequency band generated by the collision of the guide tube of the air flow by the sound structure. Furthermore, it has the effect | action that the loss of the performance accompanying the rapid expansion in a fan discharge port can be suppressed.

  Further, since the guide tube is provided so that a part of the opening is outside the guide tube, the noise of the blower outlet is incident on the muffler chamber side, and the air blower outlet is caused by a resonance effect. It has the effect | action that the noise of a low frequency band can be reduced.

  In addition, the opening is substantially rectangular and the guide cylinder is substantially cylindrical, so that the turbulence of the air flow from the discharge port of the square centrifugal blower to the round air outlet is reduced, and the blower discharge is further reduced. The noise of the exit is made incident on the muffler chamber side, and it has the effect that the noise in the low frequency band at the fuselage outlet can be reduced by the resonance effect.

  Further, the cross-sectional center of the guide tube as seen from the air blower outlet is located on the tongue side of the centrifugal blower relative to the cross-sectional center of the opening provided in the discharge port panel, and the tongue opposite the opening By adopting a configuration in which the side corners are outside the guide cylinder, the side of the tongue side of the discharge port with a small amount of work and a small flow rate is opened to the silencing chamber, so that the sound can be silenced without reducing the air volume. It has the effect | action that the noise of the low frequency band by a body blower outlet can be reduced by the resonance effect by a chamber.

  In addition, the centrifugal blower is of the double suction type, so that the wind speed at the discharge port of the blower can be slowed, air flow noise is reduced, and the flow rate at the corner on the side opposite to the tongue of the discharge port is reduced to reduce the air volume. In addition, the low frequency band noise can be reduced by the resonance effect of the muffler chamber.

  In addition, a guide cylinder holding plate for fixing the guide cylinder is provided in the silencer chamber, and it is possible to prevent the guide cylinder from being peeled off due to an airflow collision with the guide cylinder and to hold the guide cylinder in the silencer chamber. Has the effect of being able to.

  Further, the guide tube holding plate is formed by bending the end face of the opening portion of the discharge port panel into an L shape, and the discharge port panel and the guide tube holding plate are integrated. By integrally forming the tube holding plate, it is possible to prevent wind leakage at the connection portion and to fix the guide tube without attaching another part.

  Further, the guide tube holding plate is formed by bending an end surface of the opening of the airframe outlet, and the airframe and the guide tube holding plate are integrated. By forming them integrally, the connection portion can be prevented from leaking air, and the guide tube can be fixed without attaching another part.

  In addition, since a part of the guide cylinder is configured to be opened in the silencer chamber, the sound absorption frequency band of the silencer chamber can be adjusted by providing an opening in a part of the guide cylinder, and the noise frequency band of the centrifugal fan It has the effect | action that an effective sound absorption is made according to.

  In addition, the discharge port panel is provided with a bent portion, and the discharge port panel end portion to be joined to the fuselage is inclined from the discharge port toward the fuselage suction port side, and the air passage cross-sectional area formed by the discharge port panel of the blower chamber The airflow inside the airframe is deflected along the bent part provided on the discharge port panel, and the airflow toward the casing suction port becomes an airflow inflow load to the impeller because the airframe intake side is larger than the discharge port panel side. Can be reduced.

  Further, since the guide tube holding plate is provided with a plurality of small holes, the sound absorption rate of the guide tube can be increased, and noise can be reduced with a small amount of sound absorbing material. In addition, the noise reduction chamber can be reduced in size, and the sound absorbing material can be prevented from being scattered by the airflow.

  Also, by providing a plurality of small holes in the discharge port panel and a sound absorbing material attached to the discharge port panel, the sound absorption rate of the noise reduction chamber can be increased, and by providing a small hole, the space on the centrifugal fan side The sound absorbing effect can be obtained.

  In addition, the configuration in which the heat insulating material is attached to the outer surface of the machine body has an effect of preventing the heat transfer to the outside of the machine inside temperature.

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

(Embodiment 1)
As shown in FIG. 1, the blower with a sound deadening box of the present embodiment is provided with a machine body inlet 1 and a machine body outlet 2 on opposite side surfaces of a box-shaped body 3. The airframe 3 is provided with a suction-side adapter 5 that connects the suction-side duct 4 to the airframe suction port 1, and a blower-side adapter 7 that connects the airflow-side duct 6 to the airframe outlet 2. Inside the airframe 3 is an air passage 8 extending from the airframe inlet 1 to the airframe outlet 2. Further, the inside of the airframe 3 (air passage 8) is divided into two into a blower chamber 45 (airframe inlet 1 side) and a muffler chamber 16 (aircraft outlet 2 side) by a discharge port panel 17 provided in a centrifugal blower 9 described later. Is done. A centrifugal blower 9 is disposed in the blower chamber 45.

  This centrifugal blower 9 has an impeller 11 fixed to a motor 10, a blower discharge port 12 facing the fuselage outlet 2, a spiral scroll 13, and a fan casing 15 including casing side plates 14 on both sides. is doing.

  The blower outlet 12 is attached to and communicated with a rectangular opening 18 provided in the outlet panel 17.

  The sound deadening chamber 16 has a cylindrical guide tube 19 formed of a sound absorbing material, which is directed from the blower discharge port 12 to the machine body outlet 2. The guide tube 19 is held from the air passage 8 side by a guide tube holding plate 20 screwed and fixed at both ends near the discharge port panel 17 and the air outlet 2 of the airframe 3, and is fixed to the sound deadening chamber 16. Thus, it is set as the structure which has the air layer 21 between the guide cylinder 19 and the body 3. FIG.

  Further, as shown in FIG. 2, the cross-sectional center 41 of the guide tube 19 is located closer to the tongue 43 side of the centrifugal blower than the cross-sectional center 42 of the blower outlet, and the opposite tongue side corner 44 of the blower outlet 12. Is configured to be open to the muffler chamber 16.

  As shown in FIG. 3, such a blower with a silencing box is constructed by connecting a suction side duct 4 to the airframe inlet 1 and an outlet side duct 6 to the airframe outlet 2 in the ceiling 22. The airframe 3 has the airframe inlet 1 on the suction side, the airframe outlet 2 on the blowout side, the centrifugal blower 9 inside the airframe 3, and the construction hanging metal fitting 23 on the outer surface. The airframe 3 is installed on the ceiling 22 by fixing the construction suspension bracket 23 to the suspension bolts 25 embedded in the ceiling surface 24. When the centrifugal blower 9 is operated, the air outside the room 26 passes through the blowout side duct 6 via the suction side duct 4 and the centrifugal blower 9 and is supplied to the room 27. The ceiling back 22 and the room 27 are partitioned by a ceiling material 28, and a ceiling inspection port 29 is provided in the lower part of the body 3 of the ceiling material 28.

  The operation and effect of the above configuration will be described. In the above configuration, noise in a high frequency band of 1000 to 4000 Hz generated by the collision of the airflow with the guide tube 19 is absorbed by the double sound absorption structure of the guide tube 19 and the air layer 21 formed of the sound absorbing material. Further, the guide cylinder 19 suppresses performance loss due to rapid expansion at the blower discharge port 12.

  Further, a part of the opening 18 is disposed outside the guide tube 19, and the noise of the blower discharge port 12 is incident from the opening 18 toward the muffler chamber 16. The sound deadening chamber 16 has a resonance sound deadening structure, and noise in a low frequency band of 125 to 500 Hz that matches the resonance frequency is reduced.

  The opening 18 has a rectangular shape, and the guide tube 19 has a cylindrical shape. Airflow is smoothly guided from the rectangular blower outlet 12 to the round airframe outlet 2, and noise due to turbulence of the airflow is reduced. The

  In addition, the corner 44 on the side of the tongue of the blower outlet 12 having a small work volume and a low flow rate in the centrifugal blower is opened to the sound deadening chamber 16, and the resonance frequency is reduced by the resonance effect of the sound deadening chamber 16 without reducing the air flow. The noise in the low frequency band of 125 to 500 Hz that coincides with the above is reduced.

  Moreover, by making the impeller 11 into the double suction type, the wind speed of the blower discharge port 12 can be slowed down, and airflow noise is reduced. At the same time, the flow rate of the corner portion 44 on the side opposite to the tongue of the blower outlet 12 is reduced, so that the reduction in the air volume is further suppressed.

  Further, by holding the guide tube 19 from the air passage 8 side by the guide tube holding plate 20, the exposure of the guide tube 19 on the air passage 8 side is reduced, and the sound absorbing material is prevented from being peeled off due to an air current collision. The sound absorbing material can be held in the sound deadening chamber 16.

  Thus, according to the air blower with a silencing box of Embodiment 1 of this invention, the noise of the low frequency band and the high frequency band in the body blower outlet 2 can be reduced, without reducing ventilation capability.

  In addition, scattering of the sound absorbing material can be prevented with a simple structure.

(Embodiment 2)
As shown in FIG. 4, the guide tube holding plate 20 that fixes the guide tube 19 formed of a sound absorbing material is formed by bending the end surface of the opening portion of the discharge port panel 17 into an L-shape 30.

  With the above configuration, the discharge port panel 17 or the airframe outlet 2 and the guide tube holding plate 20 are integrally formed, so that the air leakage of the connection portion 31 between the discharge port panel 17 or the airframe outlet 2 and the guide tube holding plate 20 is formed. The sound-absorbing material can be fixed without attaching a separate part.

  Thus, according to the air blower with a sound deadening box according to Embodiment 2 of the present invention, the cost can be reduced with a simple structure without reducing the air blowing capacity.

  The guide tube holding plate 20 may be formed by bending an end surface of the opening of the fuselage outlet 2 in an L shape.

(Embodiment 3)
As shown in FIG. 5, a rectangular opening 32 is provided in the upper part of the guide tube 19.

  With the above configuration, the sound absorption frequency band of the sound deadening chamber 16 can be adjusted by changing the area and number of the openings 32, and the sound absorption frequency band corresponding to the discharge noise frequency band of the centrifugal blower 9 in the airframe 3 is selected. it can.

  Thus, according to the air blower with a silencer box of Embodiment 3 of this invention, the noise in the body blower outlet 2 can be reduced.

(Embodiment 4)
As shown in FIG. 6, in the fourth embodiment, the discharge port panel 17 is configured such that the discharge port panel end portion 34 joined to the body 3 is inclined from the blower discharge port 12 toward the body suction port 1. A bent portion 33 is provided at a portion in contact with the outlet 12. At this time, the air passage cross-sectional area formed by the discharge port panel 17 in the blower chamber 45 is larger on the machine body suction port 1 side than on the discharge port panel 17 side.

  According to the above configuration, the airflow in the body 3 is deflected along the bent discharge outlet panel 17 and becomes the airflow 35 toward the fan casing 15, so that the airflow inflow load to the impeller 11 can be reduced.

  As described above, according to the blower with the sound deadening box of the fourth embodiment of the present invention, it is possible to prevent the pressure loss due to the airflow collision to the discharge port panel 17, increase the air volume and reduce the input.

(Embodiment 5)
As shown in FIG. 7, the guide tube holding plate 20 has a plurality of small holes 36.

  With the above configuration, the airflow noise reflected by the guide tube holding plate 20 through the small hole 36 can be transmitted to the guide tube 19 side, and the sound absorption rate of the guide tube 19 can be increased. As a result, noise can be reduced with a small amount of sound absorbing material. Moreover, the sound deadening chamber 16 can also be reduced in size.

  As described above, according to the blower with a silencing box according to the fifth embodiment of the present invention, it is possible to reduce the cost while reducing the noise at the air outlet 2 without reducing the blowing capacity.

  Further, the size of the airframe 3 can be reduced by reducing the size of the muffler chamber 16.

(Embodiment 6)
As shown in FIG. 8, the discharge port panel 17 is provided with a plurality of small holes 37 and a sound absorbing material 38 is attached to the discharge port panel 17 on the centrifugal blower 9 side.

  With the above configuration, the noise in the sound deadening chamber 16 reflected from the discharge port panel 17 by the small hole 37 can be transmitted to the blower chamber 45 side and absorbed by the sound absorbing material 38, and the sound absorption rate of the sound deadening chamber 16 is increased. it can. The sound absorbing material 38 can obtain a sound absorbing effect on the blower chamber 45 side.

  Thus, according to the air blower with a silencer box of Embodiment 6 of this invention, the noise in the body blower outlet 2 can be reduced, and the noise in the fuselage inlet 1 can also be reduced.

(Embodiment 7)
As shown in FIG. 9, it is set as the structure which affixed the heat insulating material 40 on the outer surface of the body 3.

  With the above configuration, heat transfer to the outside of the temperature inside the machine body 3 can be prevented.

  As described above, according to the blower with the sound deadening box according to the seventh embodiment of the present invention, it is possible to prevent condensation on the outer surface of the airframe 3 that occurs when outside air that is colder from the outside is supplied indoors.

  In addition to the purpose of air conveyance such as ventilation and blower equipment, air conditioners, dehumidifiers, humidifiers, and air purifiers, it can also be applied to the use of air for equipment that can cool equipment using air blown from the air outlet. .

DESCRIPTION OF SYMBOLS 1 Airframe inlet 2 Airframe outlet 3 Airframe 8 Air path 9 Centrifugal blower 10 Motor 11 Impeller 12 Blower discharge port 13 Scroll 15 Fan casing 16 Silent chamber 17 Discharge port panel 18 Opening 19 Guide tube 20 Guide tube holding plate 21 Air Layer 23 Construction metal fittings 45 Blower room

Claims (13)

A centrifugal blower is provided inside a box-shaped airframe provided with the airframe suction port and the airframe air outlet facing each other, and the centrifugal air blower is provided with a discharge port, a spiral scroll, and a casing air intake port opposed to the airframe air outlet. A blower with a sound deadening box provided with a casing side plate, wherein the fuselage has a discharge port panel in which a discharge port of the centrifugal blower is connected to a silencer chamber on the fuselage outlet side and a blower chamber on the fuselage inlet side And the centrifugal blower is disposed in the blower chamber, the discharge port panel is provided with an opening communicating with the discharge port, and the opening and the fuselage outlet are formed of a sound absorbing material. A blower with a sound deadening box, wherein the air blower is connected with a guide tube, and an air layer is formed between the airframe and the guide tube in the sound deadening chamber. The blower with a muffler box according to claim 1, wherein the guide tube is provided so that a part of the opening is outside the guide tube. The blower with a sound deadening box according to claim 2, wherein the opening is substantially rectangular, the guide cylinder is substantially cylindrical, and a corner of the opening is outside the guide cylinder. The cross-sectional center of the guide tube as seen from the air blower outlet is located on the tongue side of the centrifugal blower relative to the cross-sectional center of the opening provided in the discharge port panel, and the side of the opening opposite to the tongue The blower with a sound deadening box according to claim 2 or 3, wherein a portion is provided outside the guide tube. The blower with a sound deadening box according to any one of claims 2 to 4, wherein the centrifugal blower is a double suction type. The blower with a muffler box according to any one of claims 1 to 5, wherein a guide tube holding plate for fixing the guide tube is provided in the muffler chamber. 7. The guide tube holding plate is formed by bending an end surface of an opening of the discharge port panel into an L shape, and the discharge port panel and the guide tube holding plate are integrated. Blower with silencer box. The said guide cylinder holding plate was formed by bending the end surface of the opening part of the said body blower outlet into L shape, and it was set as the structure which integrated the said body and the said guide cylinder holding plate. Blower with silencer box. The blower with a silencer box according to any one of claims 1 to 8, wherein a part of the guide tube is configured to be opened in the silencer chamber. The discharge port panel is formed by inclining an end portion to be joined to the fuselage toward the fuselage suction port side from the discharge port of the centrifugal blower, and the air passage cross-sectional area formed by the discharge port panel of the blower chamber is: The blower with a sound deadening box according to any one of claims 1 to 9, wherein the airframe suction port side is larger than the discharge port panel side. The blower with a muffler box according to any one of claims 6 to 8, wherein the guide tube holding plate has a plurality of small holes. The blower with a sound deadening box according to any one of claims 1 to 11, wherein the discharge port panel is provided with a plurality of small holes and further a sound absorbing material is attached to the blower chamber side. The air blower with a sound deadening box according to any one of claims 1 to 12, wherein a heat insulating material is attached to the outer surface of the machine body.

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