JP5335716B2 - Duct ventilation fan - Google Patents

Description

  The present invention relates to a ventilation fan for a duct, and more specifically, for a duct that sucks and discharges dirty air in a room by connecting a duct that is installed on the ceiling or under the floor of the room and disposed on the ceiling or the like. The present invention relates to a ventilation fan, and more particularly to a duct ventilation fan in which maintenance and replacement of a fan driving motor is easy.

  In modern houses where high airtightness and high thermal insulation are progressing, so-called 24-hour ventilation systems are increasingly used for exhausting indoor polluted air. In this system, outside air is gradually introduced as indoor polluted air is discharged by the action of a duct ventilation fan (exhaust fan).

  The current ventilation fan for ducts is equipped with a motor in the housing so that the fan can be operated continuously for 24 hours. Therefore, it is easy to maintain the motor for long-term use and can be installed on the ceiling. In view of this, it is required to be as compact as possible. Furthermore, in order to stabilize the motor drive that is the heart of the ventilation fan for the duct, a motor in which the motor is completely fixed to the housing is required.

  The thing described in Japanese Patent Publication No. 5-71848 (patent document 1) is proposed as what responds to the request | requirement of ease of maintenance. It is configured by attaching a lid that closes the opening to a box having an open front, and a casing that surrounds the motor, the fan, and the fan. In this case, since the motor, the fan, and the casing are taken out together by opening the lid, the maintenance is facilitated.

  Normally, these ventilation fans for ducts are installed by suspending, but they are quite heavy due to the large number of metal parts, and because the workability is not good, the housing is made of foamed resin to reduce the overall weight It is possible. FIG. 6 shows an example of the configuration, and the housing 30 is made of foamed resin, and is divided into two parts vertically (only the upper part is shown in FIG. 6), and the motor is placed on the inner top surface of the upper part of the housing 30. 31 is attached.

  The motor 31 is installed on a motor installation portion 32 provided on the inner top surface of the housing 30 via a motor presser 34. In the central portion of the motor installation portion 32, a recessed portion 33 for accommodating the end surface protruding portion of the motor 31 is formed. The motor presser 34 includes a support surface 36 in which a circular hole 35 for fitting a bearing portion protruding to the output shaft side of the motor 31 is formed, a side plate 37 formed by bending both ends of the support surface 36 at right angles, and each side plate. It consists of a fixed portion 38 formed by bending the end portion of 37 to the outside, and exhibits an inverted U shape as a whole.

  The motor presser 34 is fixed to the inner top surface of the housing 30 by a screw 42 inserted from the upper surface of the housing 1 through the washer 41 in a state where the lower surface side bearing portion of the motor 31 is fitted in the circular hole 35. The motor 31 is supported.

  However, according to such a fixing method, if the screw 42 is tightened too strongly, the contact portion of the fixing portion 38 and the contact portion of the washer 41 are recessed since the housing 30 is made of foamed resin. There is a risk of compressive deformation, and in the case of concave compression deformation, the motor presser 34 tilts, and the support surface 36 and the side plate 37 come into contact with the main body of the motor 31 to generate noise, and normal rotation of the motor 31 is prevented. The problem of obstruction occurs.

  In order to solve this problem, the applicant of the present invention first prevents a screw from being over-tightened when a motor is attached by fitting a cylindrical spacer for screw insertion into the housing. A duct ventilation fan was proposed in which the housing is prevented from causing concave compression deformation by arranging a receiving plate that is in wide contact with the surface and receives the tightening force of the screw (Patent Document 2: Japanese Patent Laid-Open No. 2008-224129). .

  However, in any of the duct ventilation fans described above, the motor presser 34 that supports the motor 31 is fixed to the inner top surface of the housing 30 by the screw 42 inserted from the upper surface of the housing 30. It cannot be removed from the inside. Therefore, in the case of these conventional ventilation fans for ducts, when maintenance or replacement of the motor 31 is necessary, an operator must enter the ceiling and remove the screw 42 or remove the entire ventilation fan for ducts. In other words, the work takes time and effort, and in practice, maintenance cannot be performed frequently.

Japanese Patent Publication No. 5-71848 JP 2008-224129 A

  As described above, in the case of the above conventional duct fan, if the fan drive motor needs to be maintained or replaced, whether the operator enters the ceiling and removes the screw, or removes the entire duct fan There is a problem that it takes time and labor for the work, and the maintenance cannot be performed frequently in practice.

  Therefore, the present invention does not have such a problem, that is, since the motor presser for installing the motor can be easily removed from the indoor side, the motor presser can be removed at any time and the motor can be taken out. It is an object of the present invention to provide a ventilation fan for a duct that can be easily performed or replaced.

The invention described in claim 1 for solving the above-mentioned problem is a box-like shape lacking a bottom surface, and two intake duct connection ports are juxtaposed on each of the three peripheral side surfaces, and the remaining peripheral side surfaces One exhaust duct connection port having a diameter larger than that of the intake duct connection port and a foamed resin housing having a control board attached thereto, a fan attached to the inner top surface of the housing, and driving the fan A duct ventilation fan comprising a motor and a metal or resin bottom plate removably attached to a bottom opening of the housing, the housing including the intake duct connection port and the exhaust duct connection port The motor has a pair of side plates fixed to the inner top surface of the housing, and a lower surface side bearing portion of the motor. By engagement, characterized in that attached by a motor retainer consisting of the outer surface and extensively surface contacted to the support plate have a cylindrical portion is detachably coupled to the side plate on the inner top surface of the housing It is a ventilation fan for ducts.

  In a preferred embodiment, the side plate of the motor presser is bent and extended at right angles at both ends, and screw holes are provided in each bent portion, and the motor presser is fixed to the housing fitted with a cylindrical spacer. It is fixed to the inner top surface of the housing by being screwed with a fixing screw inserted into the screw hole through the screw insertion portion.

  The duct ventilation fan according to the present invention is as described above, and the motor presser that supports the motor includes a pair of side plates fixed to the inner top surface of the housing and a cylindrical portion that fits the lower surface side bearing portion of the motor. Since it is composed of a support plate that is detachably attached to the side plate, it is easy to take out the motor by removing the support plate from the side plate, and thus, simple work from the indoor side Thus, there is an effect that the motor can be maintained or replaced.

  In addition, since the portion of the support plate that receives the lower surface bearing portion of the motor is cylindrical, the surface contact with the lower surface bearing portion over a wide range is ensured to prevent the motor from sideways and is supported in a stable state. Therefore, there is an effect that the motor is reliably prevented from coming into contact with the peripheral portion and generating an abnormal noise.

  Furthermore, since a cylindrical spacer for screw insertion is fitted in the housing, the housing is not restricted and excessively tightened when the motor is mounted. Therefore, the generation of abnormal noise due to concave compression deformation is reliably prevented, and in combination with the fact that the housing is a foamed resin body, it is possible to operate with low noise without installing a separate soundproofing material etc. There is an effect.

It is a disassembled perspective view of the ventilation fan for ducts concerning this invention. It is a disassembled perspective view of the upper half part of the ventilation fan for ducts concerning this invention. It is a top view of the ventilation fan for ducts concerning this invention. It is a perspective view of the lower half part of the ventilation fan for ducts concerning this invention. It is an installation state figure of the ventilation fan for ducts concerning the present invention. It is a disassembled perspective view of the upper half part of the conventional ventilation fan for ducts.

  A mode for carrying out the present invention will be described with reference to the accompanying drawings. The duct ventilation fan according to the present invention includes a box-shaped housing 1 having an open bottom, a motor 6 and a fan 7 installed on the inner top surface thereof, and a motor presser 12 for supporting the motor 6 in the housing 1. The casing 8 is integrally formed on the inner surface of the housing 1 so as to surround the fan 7, and the bottom plate 5 is detachably attached to the bottom of the opening of the housing 1.

  The housing 1 is formed into a box shape lacking a bottom surface with a foamed resin such as polystyrene, and two intake duct connection ports 2 are provided to project on the three circumferential side surfaces thereof. Further, one exhaust duct connection port 3 having a diameter larger than that of the intake duct connection port 2 is projected from the remaining peripheral side surface, and the control board 4 is attached to the side (see FIG. 1).

  Since the inspection port 27 provided on the ceiling is generally 45 cm square, it is preferable that the housing 1 and the bottom plate 5 have a smaller size (see FIG. 5). Since the housing 1 is made of foamed resin as described above, it is possible to operate with low noise without separately providing a soundproofing material.

  Usually, the housing 1 is formed by separately molding the two parts (1a, 1b) including the intake duct connection port 2 and the exhaust duct connection port 3 and bonding the two molded products by adhesion or the like. Is formed.

  A motor installation portion 9 for attaching the motor 6 and the motor presser 12 that supports the motor 6 is formed on the inner top surface of the upper housing 1a located on the upper side (see FIG. 2). The motor installation part 9 is generally a quadrangle having a surrounding wall 9 a having a size corresponding to the motor presser 12, and a recessed part 13 for accommodating the upper surface side bearing part of the motor 6 is formed at the center part thereof. In addition, screw holes 14 are provided at the four corners of the motor installation portion 9, and for the reinforcement, cylindrical spacers 23 made of resin such as polyacetal resin or metal are fitted into each screw hole 14. The cylindrical spacer 23 has a length corresponding to the thickness of the upper housing 1a.

  The motor presser 12 includes a support plate 16 having a cylindrical portion 15 into which the lower surface side (output shaft side) bearing portion 11 of the motor 6 is fitted, and two side plates 17 to which each end of the support plate 16 is detachably attached. When the support plate 16 and the two side plates 17 are joined, a U-shape is exhibited. Preferably, both end portions of the support plate 16 are bent and extended at a right angle to form a bent portion 16a so that each side plate 17 fits inside the bent portion 16a. By doing so, the mounting operation of the support plate 16 to the side plate 17 is facilitated.

  Both end portions of each side plate 17 are usually bent at right angles in the same direction, and screw holes 18a and 19a are opened in each bent portion. The screw hole 18 a of the upper bent portion 18 is drilled so as to correspond to the screw hole 14 of the motor installation portion 9, and the screw hole 19 a of the lower bent portion 19 is a screw hole 16 b provided in the support plate 16. It is drilled to correspond to. The motor retainer 12 having such a structure is fixed to the top surface of the upper housing 1a by inserting a fixing screw 24 from the upper surface side of the upper housing 1a through the washer 25 and the cylindrical spacer 23, and exposing the lower end portion of the motor holder 9 from the motor installation portion 9. The exposed portion is screwed through the screw hole 18a of the upper bent portion 18 of the side plate 17.

  It should be noted that the action of the washer 25 and the cylindrical spacer 23 prevents the occurrence of concave compression deformation due to excessive tightening of the fixing screw 24. However, if necessary, the screw is formed on the upper surface of the upper housing 1a and at the four corners. A protective plate 21 made of metal, hard plastic or wood having screw holes 22 corresponding to the holes 14 and 18 may be arranged. The protective plate 21 is fixed on the upper surface of the upper housing 1 a and then fixed by a fixing screw 24 inserted into the screw hole 22.

  When the motor presser 12 is fixed to the inner top surface of the upper housing 1a as described above, the top surface of the upper housing 1a is sandwiched in a surface contact state by the washer 25 and the upper bent portion 18 of the side plate 17, Further, when the fixing screw 24 is tightened, since the cylindrical spacer 23 is fitted in the screw hole 14 of the upper housing 1a, the upper housing 1a is tightened until the length of the cylindrical spacer 23 or less. There is no. Therefore, there is no possibility that the concave compression deformation occurs because no excessive tightening force is applied to the upper housing 1a, and the motor presser 12 is tilted due to the partial concave compression deformation, and a part thereof is applied to the motor 6. It is reliably avoided that the contact makes an abnormal noise or adversely affects the rotation of the motor 6.

  The motor 6 is attached in a state where the side plates 17 are fixed to the motor installation portion 9 by the fixing screws 24 as described above. In mounting, the motor 6 is disposed on the motor installation portion 9 with the lower surface side bearing portion 11 of the motor 6 fitted to the cylindrical portion 15, and the upper surface side bearing portion is fitted in the recessed portion 13. In this state, the screw holes 19a of the side plates 17 are aligned with the screw holes 16b of the support plate 16, so the fixing screws 20 are inserted there and screwed.

  The motor 6 is supported by the motor presser 12 in this way. At this time, the portion of the support plate 16 that receives the lower surface bearing portion 11 of the motor 6 is not a simple hole but a cylindrical portion 15, and its inner surface. Is in surface contact with the outer peripheral surface of the lower surface bearing portion 11 in a wide range, so that the motor 6 is reliably prevented from sideways and is supported in a stable state. Therefore, the motor 6 is reliably prevented from coming into contact with the peripheral portion and making an abnormal noise. Further, the motor 6 can be easily taken out and used for maintenance or the like by performing an operation reverse to the installation operation and removing the support plate 16 from the side plate 17.

  The casing 8 constitutes a flow path for air sent out from the fan 7 and can be integrally formed in the lower housing 1b of the housing 1 divided into two (see FIG. 4). A bottom plate 5 made of metal or resin is detachably installed at the bottom opening of the housing 1 through, for example, a screw. Alternatively, one side may be hinged to the side of the housing 1 so that it can be opened and closed.

  As the fan 7, it is preferable to use a fan that can be sucked up and down (both sides) in order to increase the amount of intake air. In this case, a plurality of small holes 7b are formed in the donut-shaped substrate 7a of the fan 7 (see FIG. 1). When this double-sided intake fan 7 is used, the upper surface of the fan 7, more specifically, the upper surface of the casing 8 that covers the fan 7 and the inner top surface of the housing 1, in order to guide the sucked air up and down the fan 7. In addition, the bottom plate 5 is made hollow, and the upper surface 5a and the lower surface 5b are provided with a ventilation space with an appropriate space therebetween via the support fitting 5c (see FIG. 1).

  The upper surface 5 a of the bottom plate 5 is formed smaller than the lower surface 5 b so that a gap is formed between the upper surface 5 a and the inner surface of the housing 1. Thereby, the dirty air introduced into the housing 1 flows into the ventilation space between the upper surface 5a and the lower surface 5b through the gap, and is sucked up by the fan 7 from the vent 5d formed in the upper surface 5a.

  Further, a ventilation gap 29 is required for introducing the dirty air sucked from the intake duct connection port 2 into the ventilation space on the upper side of the casing 8 and the ventilation space between the upper and lower surfaces 5a and 5b of the bottom plate 5. It can be formed at the corner of the housing 1 by making the housing 1 into a quadrangular shape and the casing 8 in a circular shape inscribed therein (see FIGS. 1 and 4). Note that one corner of the housing 1 is closed because it becomes an exhaust port 8c to the exhaust duct connection port 3 of the casing 8 (see FIG. 4).

  Thus, the casing 8 is formed so as to be inscribed in the housing 1, so that the whole can be made compact. In addition, it is preferable to fix the sealing material 10 for air-sealing the part which receives the lower surface 8b of the casing 8 to the upper surface 5a of the baseplate 5 (refer FIG. 1).

  The ventilation fan for ducts according to the present invention is used in the same manner as the conventional one. That is, this duct ventilation fan is arranged on the back of the ceiling where the inspection port 27 is provided by, for example, a method of fixing the ceiling bolt 28 to a fixing bracket installed on the upper surface of the housing 1 (see FIG. 5). The end of the exhaust duct extending from the outer wall is fitted into the exhaust duct connection port 3, and the end of the intake duct extending from each chamber is fitted into any one of the intake ducts 2.

  Thus, when the motor 6 is switched on, the dirty air in each chamber is sucked out by the action of the fan 7 and sucked into the housing 1 through the intake duct. A part of the sucked air enters the ventilation space on the upper side of the casing 8, and is sucked into the upper side of the fan 7 through the upper surface opening 8a of the casing 8, and a part of the air is sucked around the bottom plate upper surface 5a. The air is sucked into the lower ventilation space through the gap and is sucked up to the lower side of the fan 7 from the vent hole 5d on the upper surface 5a of the bottom plate.

  The air sucked into the fan 7 moves appropriately upward or downward through the small hole 7b inside the fan 7. And it is guide | induced to the exhaust duct connection port 3 from the exhaust port 8c along the casing 8 from the inner side of the fan 7, and is discharge | released to air | atmosphere from the exhaust grill installed in an outer wall through an exhaust duct.

  In the case of the duct ventilation fan according to the present invention, the motor presser 12 is exposed when the fan 7 is removed, and the connecting portion of the support plate 16 to the side plate 17 is also exposed indoors. Therefore, by removing the fixing screw 20, the support plate 16 and the motor 6 supported by the support plate 16 can be easily removed, so that maintenance and replacement of the motor 6 can be easily performed indoors. Become.

  Although the present invention has been described in some detail with respect to its most preferred embodiments, it will be apparent that a wide variety of different embodiments can be constructed without departing from the spirit and scope of the invention, the invention being defined by the appended claims. It is not restricted to the specific embodiment other than limiting in.

DESCRIPTION OF SYMBOLS 1 Housing 1a Upper housing 1b Lower housing 2 Intake duct connection port 3 Exhaust duct connection port 4 Control board 5 Bottom plate 6 Motor 7 Fan 8 Casing 9 Motor installation part 11 Lower surface side bearing part 12 Motor presser 13 Recessed part 14 Screw hole 15 cylindrical portion 16 support plate 16a bent portion 16b screw hole 17 side plate 18 upper bent portion 18a screw hole 19 lower bent portion 19a screw hole 20 fixing screw 21 protective plate 23 cylindrical spacer 24 fixing screw 25 washer

Claims (2)

A box-like shape that lacks a bottom surface, with two intake duct connection ports arranged side by side on each of the three circumferential sides, and an exhaust duct connection that is wider than the intake duct connection port on the remaining circumferential side surface A foamed resin housing with one opening projecting and a control board attached, a fan attached to the inner top surface of the housing and a motor for driving the same, and a metal made removably attached to the bottom opening of the housing Or a ventilation fan for a duct comprising a resin bottom plate,
The housing is formed by joining two molded products divided into two parts including the intake duct connection port and the exhaust duct connection port,
The motor includes a pair of side plates fixed to the inner top surface of the housing, the plate lower surface side bearing part have a cylindrical portion for extensive surface contact with the outer surface by engagement of the motor A ventilation fan for a duct, which is attached to an inner top surface of the housing by a motor presser comprising a support plate that is detachably coupled.   The side plate of the motor presser is bent and extended at both ends at right angles, and screw holes are provided in each bent part, and the motor presser passes through the fixing screw insertion part of the housing fitted with a cylindrical spacer. The ventilation fan for a duct according to claim 1, wherein the ventilation fan is fixed to an inner top surface of the housing by being screwed with a fixing screw inserted into the hole.

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