JP2007211732A - Ventilating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventilating device, which is built in a box body, having a double suction type centrifugal blower provided with a diversion member of good productivity and capable of reducing cost. <P>SOLUTION: In the ventilating device having the double suction type centrifugal blower 5 sucking air from suction ports 6 provided on both side plates 8 of a blade casing 7 built in the muffling box body 4 composed by joining plate material, sucking air from a suction end opening part on one side surface of the muffling box body 4 and blowing out air from a blow out end opening part 3 on another side surface, and provided with the diversion member 10 made of sound absorbing material distributing air flow to two suction port 6 direction of the centrifugal blower 5 on a section opposing to the suction end opening part 2 of the blade casing 7, the diversion member 10 is inserted in a projection 11 provided on an end edge of both side plates 8 of the blade casing 7 inward as one body without projecting out, and is retained by penetrating into the same. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a ventilator in which a double suction centrifugal fan is incorporated in a box that performs a silencing function.

  In a ventilation system that ventilates indoor air through a duct, a box that performs a silencing function to prevent the operating sound of the blower from being applied to the room is a box alone or a main body box incorporating a blower Often configured. The box has a structure in which a sound-absorbing material is attached to an inner wall surface facing a ventilation path of a hexahedral hollow body made of a steel plate material. A double suction centrifugal fan is incorporated in the box to form a ventilation device. Some centrifugal fans themselves have a silencing function (see Patent Document 1).

Japanese Utility Model Publication No. 56-71999

  The technology related to noise reduction disclosed in Patent Document 1 is a method in which a sound absorbing material is attached to the inner surface of a blade casing of a centrifugal blower. In a ventilation device in which a centrifugal blower is incorporated in a box body having a silencing function, there is little meaning to impart the silencing function to the blade casing of the blower, and the silencing function is given to the ventilation path in the box leading to the centrifugal blower. In the case of incorporating a double suction centrifugal blower, there is a motor, its mounting leg, etc. at the suction port on the motor side, which causes noise generation. Therefore, a diversion member that reduces the airflow to the motor-side suction port and increases the airflow to the non-motor-side suction port is provided at the facing portion of the suction end opening of the box.

  This flow diverting member is designed to reduce the noise by distributing the airflow between the motor side suction port and the counter motor side suction port, but the wind from the suction end opening of the box collides. For this reason, the air passage in the box is made of a sound absorbing material in order to provide a silencing function. The diversion member is mounted on the outer peripheral portion of the blade casing. For the mounting, (b) a fixing bracket is used, or (b) a method of bonding with an adhesive or double-sided tape is employed. This fixing bracket is a scissors with a washer with a sharp tip. The shunting member is placed on one side of the blade casing so that the tip of the blade casing is in contact with the shunt, and a current is passed through the fixing bracket using a spot welder. The pointed tip is spot welded to the blade casing.

  In addition to this, (c) A pointed projecting piece that penetrates the flow dividing member in advance is attached to the blade casing, and the flow dividing member is pressed to penetrate the projecting piece, and a washer is fitted to the projecting piece, There is also a mounting method in which the tip portion is bent and one side of the flow dividing member is pressed with a washer.

  In the method (a), a spot welder is required and the equipment becomes large. In the method (b), there is a problem of a decrease in adhesive force due to deterioration over time, and the reliability is low. In the method (c), the number of parts increases and workability is poor. Both methods have problems that the work cannot be performed in the assembly line, or the work is complicated even if it can be done, and the productivity is low and the cost is high.

  The present invention has been made in order to solve the above-described problems. The object of the present invention is to provide a double suction type centrifugal fan provided with a flow dividing member made of a sound absorbing material with good productivity and cost reduction. It is to get a ventilation device built into.

  In order to solve the above problems, the present invention incorporates a double-suction centrifugal blower that sucks air from suction ports provided on both side plates of a blade casing, into a box formed by joining plate members, A sound absorption system that sucks air from the suction end opening and blows out from the blow end opening on the other side, and distributes the air flow in the direction of the two suction openings of the centrifugal fan at the location facing the suction end opening of the blade casing. About the ventilation apparatus provided with the flow dividing member which consists of material, the means which inserts a flow dividing member without protruding in the protrusion integrally provided in the end edge of the both-sides board of a blade | wing casing, and carries out biting is employ | adopted.

According to the present invention, the flow dividing member is not necessary and can be assembled in the assembly line.
A ventilation device incorporating a double suction centrifugal fan equipped with a flow dividing member made of a sound absorbing material capable of reducing cost with good productivity is obtained.

  The ventilator of the present invention includes a centrifugal blower in a hexahedral box-shaped sound deadening box provided with suction end openings and blowout end openings, which are respectively attached to both side surfaces with connection port parts for connecting ducts. Is built in. Centrifugal blower is a double suction type that has suction ports on both the motor side and the non-motor side. The two suction ports are up and down (can be front and back), and the discharge port is directed to the outlet end opening. It is installed in the middle of the sound box.

  A blade casing of a centrifugal blower is made of a steel plate, which includes two rectangular side plates having a suction port in the center and a scroll sandwiched between the side plates. A branching member made of a sound absorbing material that distributes the airflow in the direction of the two suction ports of the centrifugal blower is provided at a location facing the suction end opening of the blade casing. The shunt member reduces noise by reducing the airflow to the motor side suction port and increasing the airflow to the non-motor side suction port, but the wind from the suction end opening collides. For this purpose, it is made of a sound absorbing material in order to provide a sound deadening function to the ventilation path in the sound deadening box. On the edge of the two side plates on the suction end opening side, protrusions that project inward at substantially right angles are integrally provided at the upper and lower ends. An inward flange-shaped holding surface portion is formed at a retracted position between the upper and lower protrusions. The projecting dimension of the holding surface portion is larger than the protruding dimension of the protrusion. The projection is inserted into the flow dividing member by pressing the side plates one by one so that the holding surface portion is applied to the original side of the flow dividing member to hold the end surface portion of the flow dividing member and guided to the holding surface portion as it is, The flow diverting member is bitten and held. The biting holding position of the flow dividing member is defined by being applied to the holding surface portion, and the flow dividing member is restrained without being inclined and is attached to the blade casing in a stable state.

Embodiment 1 FIG.
1 to 5 relates to a ventilator. 1 is a cross-sectional view of a ventilator, FIG. 2 is an exploded perspective view of a blade casing portion of the ventilator, FIG. 3 is an enlarged perspective view of a main part of a side plate, and FIG. 4 is a main part of another side plate. The perspective view which expands and shows a part, FIG. 5: is a perspective view which expands and shows the principal part of another side plate.

  The present embodiment relates to a ventilator that is installed in a space such as the back of a ceiling of a building and ventilates by sucking indoor air through a duct and exhausting it outside the room. This ventilator has a hexahedron box-shaped sound deadening box 4 provided with a suction end opening 2 and a blowout end opening 3 facing each other, each of which has connecting port parts 1 for connecting ducts to both sides. The centrifugal blower 5 is built in and configured. The centrifugal blower 5 is a both-suction type having suction ports 6 on both the motor side and the non-motor side. The two suction ports 6 are moved up and down (may be front and rear), and the discharge ports are connected to the blowing end opening 3. Toward, it is attached to a substantially middle part in the sound deadening box 4 (see FIG. 1).

  The blade casing 7 of the centrifugal blower 5 is composed of two rectangular side plates 8 having a suction port 6 in the approximate center as shown in FIG. 2, and a scroll 9 sandwiched between the side plates 8, and is made of a steel plate. Yes. A part of the blade casing 7 facing the suction end opening 2 is provided with a flow dividing member 10 made of a sound absorbing material that distributes the air flow toward the two suction ports 6 of the centrifugal blower 5. The diversion member 10 reduces noise by reducing the airflow to the motor-side suction port 6 and increasing the airflow to the non-motor-side suction port 6, but from the suction end opening 2. In order for the wind to collide and to provide a silencing function to the ventilation path in the silencing box 4, it is made of a sound absorbing material. The vertical dimension of the flow dividing member 10 is substantially equal to the dimension between the side plates 8 of the blade casing 7, and the longitudinal dimension is substantially equal to the longitudinal dimension of the sound deadening box 4.

  Triangular protrusions 11 projecting inward are integrally provided at the upper and lower ends of the edge of the two side plates 8 on the suction end opening 2 side. An inward flange-shaped holding surface portion 12 is formed between the upper and lower protrusions 11 at a retracted position. The projecting dimension of the holding surface portion 12 is about twice as large as the projecting dimension of the protrusion 11. The protrusion 11 is formed by pressing the side plate 8 one by one so that the holding surface portion 12 is pressed against the original side of the flow dividing member 10 to hold the end surface portion of the flow dividing member 10 and guided to the holding surface portion 12 as it is. The diversion member 10 is inserted and held. The biting holding position of the flow dividing member 10 is defined by being applied to the holding surface portion 12, and the flow dividing member 10 is attached to the blade casing 7 in a stable state with no inclination and restrained in all directions. The mounting operation of the flow dividing member 10 can be performed without a tool in the assembly line.

  The protrusion 11 is easy to pierce and is formed into an isosceles triangle having a base of 15 mm, a height of 12 mm, and an inclination angle of 30 degrees so as to obtain a necessary holding force, and the tip thereof is rounded to prevent damage during assembly work. From the viewpoint of holding force, a rectangular protrusion 11 may be used as shown in FIG. In this case, the tip edge is easy to pierce and is preferably chamfered obliquely. Further, the number of the protrusions 11 may be one per side plate 8 or two or more as shown in FIG. As for the protrusions 11, the number and shape of the protrusions 11 that can be easily pierced and that provide the necessary holding force may be selected.

It is sectional drawing of a ventilation apparatus. (Embodiment 1) It is a disassembled perspective view of the blade | wing casing part of a ventilator. (Embodiment 1) It is a perspective view which expands and shows the principal part of a side plate. (Embodiment 1) It is a perspective view which expands and shows the principal part of another side plate. (Embodiment 1) Furthermore, it is a perspective view which expands and shows the principal part of another side plate. (Embodiment 1)

Explanation of symbols

  2 suction end opening, 3 blowout end opening, 4 silencer box, 5 centrifugal blower, 6 suction port, 7 blade casing, 8 side plate, 10 flow diverting member, 11 protrusion, 12 holding surface.

Claims (3)

  A double-suction type centrifugal blower that sucks air from the suction ports provided on both side plates of the blade casing is incorporated in the box formed by combining the plate materials, and air is sucked from the suction end opening on one side of the box. A flow dividing member made of a sound absorbing material that distributes the air flow in the direction of the two suction ports of the centrifugal blower is provided at a location facing the suction end opening of the blade casing so as to be blown out from the blowout end opening of the side surface. The ventilator provided, wherein the diverting member is inserted and held in the projections provided integrally inwardly on the edges of both side plates of the blade casing so as to bite and hold.   The ventilator according to claim 1, wherein a holding surface portion is provided integrally with the flow dividing member so as to hold the end surface portion of the vane casing inwardly toward the edges of both side plates of the blade casing.   The ventilator according to claim 2, wherein the projecting dimension of the holding surface portion is larger than the projecting dimension of the protrusion.

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