JP5355481B2 - Ventilation equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventilation apparatus which can clean blades inexpensively. <P>SOLUTION: The ventilation apparatus 100 includes: a body 21 provided with a ventilation flue from an indoor-side inlet 19 to an outdoor-side outlet 20 inside thereof; a cylindrical multi-blade centrifugal fan 4 disposed in a fan casing 23 constituting a part of the ventilation flue, and having an approximately-circular main plate 4b and a plurality of blades 4c disposed at an outer periphery of the main plate 4b at equal intervals in parallel with each other, and vertically disposed in parallel with a central axis; a motor 16 of which a driving shaft is connected to the cylindrical multi-blade centrifugal fan 4 for generating airflow in the ventilation flue by driving the cylindrical multi-blade centrifugal fan 4; and a blade cleaning plate 18 having an approximately-circular base, and a plurality of projecting parts formed into the comb shape outward over the whole periphery of an outer peripheral part of the base and respectively held between the adjacent blades, and reciprocatable in the axial direction of the cylindrical multi-blade centrifugal fan 4. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a ventilation device equipped with a cylindrical multiblade centrifugal fan.

  In recent years, ventilation for 24 hours (always) has become mandatory as a measure against sick house syndrome, and the operation has been changed from a few hours of operation per day, which has been performed with conventional local ventilation, to 24 hours. As the operation time becomes longer, the amount of dust attached to the fan also tends to increase.

  For example, according to a ventilation fan that exhausts indoor air through a duct or the like embedded in a ceiling structure or wall structure, dust floating in the indoor air adheres to the fan of the ventilation fan and gradually accumulates. If the ventilation fan is continuously used while dust is accumulated, not only the predetermined air blowing performance can be exhibited but also a secondary problem such that the noise increases.

  Periodic maintenance is required to remove the accumulated dust. However, in a normal ventilation fan, it is necessary to remove the fan from the main unit and clean it. If the fan is not properly assembled to the shaft, it may cause a malfunction such as the occurrence of abnormal noise due to imbalance of the fan or contact with the fan casing forming the air passage, or the fan falling off.

  On the other hand, in order to prevent dust from entering the inside of the main body of the ventilation fan and facilitate maintenance, there is a case in which a commercially available filter is attached to the suction port of the ventilation fan. However, if a filter is disposed in the suction port or the ventilation path, not only the original air blowing performance cannot be exhibited due to pressure loss, but also the problem that the maintenance cost becomes high due to the replaced filter occurs.

  Conventionally, as another fan cleaning method, a blade angle variable mechanism is attached to the fan, the angle of the blade is changed so that the main surface of the blade angle faces the outside, and then dust is rubbed off with a soft brush from the outside of the blade. A method or a method of cleaning by jetting liquid from a jet nozzle onto a blade has been devised (for example, Patent Document 1).

JP 2008-241100 A

  However, according to the conventional method of changing the angle so that the wing faces the outside and scrubbing with a brush, or the method of spraying liquid from the spray nozzle onto the wing and flowing dust, it is necessary to provide a wing variable mechanism. In addition, there is a problem that a complicated structure is required and a cost is increased because it is necessary to provide a mechanism for ejecting liquid.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a ventilator that can perform reliable blade cleaning with a simple structure while keeping costs low.

  In order to solve the above-described problems and achieve the object, the ventilator according to the present invention includes a main body that forms a ventilation path from a suction port on the indoor side to a discharge port on the outdoor side, and a part of the ventilation path. A cylindrical multiblade centrifugal fan that is disposed in a fan casing and has a substantially circular main plate and a plurality of blades that are arranged at equal intervals on the outer periphery of the main plate and are erected in parallel to each other and in parallel to the central axis A motor that connects the drive shaft to a cylindrical multi-blade centrifugal fan to drive the cylindrical multi-blade centrifugal fan to generate an air flow in the ventilation path, a substantially circular substrate, and an entire circumference around the substrate A blade cleaning plate that is formed in a comb-teeth shape outward and sandwiched between adjacent blades, and is provided so as to be reciprocally movable in the axial direction of the cylindrical multiblade centrifugal fan; It is provided with.

  According to the present invention, in a ventilator equipped with a cylindrical multiblade centrifugal fan, dust attached to and accumulated on the wing is mounted on the fan in advance without removing the fan from the main body and without changing the fan wing. It is possible to remove the wing cleaning plate easily and reliably. In addition, it is possible to add a detachable capturing means for collecting the removed dust, and it can be expected that the removed dust can be easily discarded. From such a thing, there exists an effect that the ventilation apparatus which can perform wing | blade cleaning with an easy structure and low cost can be provided.

FIG. 1 is a cross-sectional view showing an installed state of a duct ventilation fan as an embodiment of a ventilation apparatus according to the present invention. FIG. 2 is an exploded perspective view of the duct ventilation fan of FIG. 1. 3 is an enlarged front view showing a cylindrical multiblade centrifugal fan and a blade cleaning plate of the duct ventilation fan of FIG. 4 is a cross-sectional view of the cylindrical multiblade centrifugal fan and the blade cleaning plate shown in FIG. FIG. 5 is a front view of the blade cleaning plate. FIG. 6 is a view for explaining the engagement state between the cylindrical multiblade centrifugal fan and the blade cleaning plate, and is a perspective view showing the vicinity of a central boss portion of the blade cleaning plate and the fan. FIG. 7 is a perspective view showing the fan casing. FIG. 8 is a perspective view of the orifice ring as viewed from the surface side. FIG. 9 is a perspective view of the orifice ring as seen from the back side.

  Embodiments of a ventilator according to the present invention will be described below in detail with reference to the drawings. In this embodiment, the ventilation device according to the present invention is applied to a duct ventilation fan installed in a state of being embedded in a ceiling structure or a wall structure. Note that the present invention is not limited to the embodiments.

Embodiment.
FIG. 1 is a cross-sectional view showing an installation state of a duct ventilation fan as an embodiment of a ventilation apparatus according to the present invention. FIG. 2 is an exploded perspective view of the duct ventilation fan of FIG. 1. The ventilation fan for duct 100 is generally installed in a state of being embedded in a ceiling structure or a wall structure for ventilation of indoor air, and is connected to a duct 27 or a pipe that communicates indoors and outdoors to exhaust indoor air to the outside. Ventilate by.

  A duct ventilation fan (hereinafter simply referred to as a ventilation fan) 100 according to the present embodiment has a substantially box-shaped outer shell 14 that opens two adjacent surfaces, and one open surface of the outer shell 14 faces the air inlet 19 facing the room. The duct 27 is connected to the other open surface. The ventilation fan 100 is fixed to the field edge 50 with an attachment screw 30 and attached to an opening 60 formed in the ceiling plate 40, for example. A portion including the suction port 19 exposed to the indoor side from the ceiling plate 40 is covered with a decorative grill 26 over the entire surface. The decorative grill 26 is fixed to the decorative grill hook 29 of the fan casing 23 by a spring 28. Indoor air is sucked from the suction port 19 through the decorative grille 26 and discharged from the discharge port 20 to the duct 27 to ventilate the indoor air.

  The ventilation fan 100 has a multi-blade fan 15 that is a ventilation drive body for circulating air to be ventilated, a fan casing 23 that surrounds the multi-blade fan 15 to form a ventilation path, and a suction port 19 in the center. It has an orifice ring 22 that rectifies the suction flow and forms a ventilation path together with the fan casing 23, and a resin main body 21 that houses these. The multi-blade blower 15 includes a motor 16 and a cylindrical multi-blade centrifugal fan (hereinafter simply referred to as a fan) 4 fixed to the drive shaft of the motor 16.

  The outer shell 14 includes a rectangular box-shaped main body 21 and a stepped duct connection that is provided on a side portion of the main body 21 and extends from a side surface of the main body 21 in a right angle direction to a position where the discharge port 20 communicates with the duct 27. A frame 24 is included. In the duct connection frame 24, a shutter 25 that opens and closes by electric power or wind pressure is provided. The duct 27 extends to the outdoors.

  The ventilation fan 100 configured in this manner takes in indoor air by driving the motor 16 and rotates the fan 4 connected to the motor 16, and discharges it through the duct 27 to the outside. The shutter 25 attached to the duct connection frame 24 is in an open state when ventilating to discharge air, and is closed when not ventilating to prevent intrusion of air from outside.

  In such a ventilation fan, dust floating in the room air adheres to and accumulates on the blades 4 c of the fan 4. When the ventilation fan is operated while dust is accumulated, not only the predetermined air blowing performance cannot be sufficiently exhibited, but also problems such as increased noise may occur. Therefore, periodic cleaning of the fan 4 is necessary.

  FIG. 3 is an enlarged front view showing the fan 4 and the blade cleaning plate of the ventilation fan 100 of FIG. 4 is a cross-sectional view of the fan 4 and the blade cleaning plate shown in FIG. 3 and 4, the fan 4 is a cylindrical multiblade centrifugal fan as described above, and includes a central boss portion 4a provided at the center for coupling to the drive shaft of the motor 16, and a central boss portion 4a. An approximately conical main plate 4b extending so as to spread from the periphery toward the motor 16 side, and an outer peripheral portion of the main plate 4b are provided at equal intervals over the entire circumference and are arranged in parallel to each other and in parallel to the shaft so as to form a substantially cylindrical shape as a whole. And a plurality of blades 4c. As shown in FIG. 3, the cross-sectional shape of the blade 4 c is a substantially arc shape.

  The main plate 4b of the fan 4 has a conical shape that forms a relief on the motor 16 side so as not to interfere with the motor 16 (FIG. 1). The central boss 4a provided at the center is engaged with a press-fitting portion 4f (FIG. 4) for inserting the drive shaft of the motor 16 and an engagement hole 4e (with an engagement claw 18e of the blade cleaning plate 18). 3) is formed. A cylindrical press-fitting spring 5 is disposed in the press-fitting part 4f, and the fan 4 and the motor 16 are coupled by press-fitting a motor drive shaft into the press-fitting part 4f.

  Next, the blade cleaning plate 18 will be described. FIG. 5 is a front view of the blade cleaning plate 18. FIG. 6 is a diagram for explaining an engagement state between the fan 4 and the blade cleaning plate 18, and is a perspective view showing the blade cleaning plate 18 and the vicinity of the central boss portion 4 a of the fan 4 by cutting away. In FIG. 6, the hatched portion shows a cut section. As shown in FIG. 5, the blade cleaning plate 18 is formed by integral molding with a resin. As shown in FIG. 5, a substantially conical substrate 18a having a central opening 18b at the center and a comb that extends horizontally around the entire periphery of the substrate 18a. It has a plurality of protrusions (comb teeth) 18c that are formed in a tooth shape and are sandwiched between adjacent wings 4c. The cross-sectional shape of the protrusion 18c is equal to the shape of the gap between two adjacent blades 4c. That is, the shape of the protrusion 18c is a shape that closely contacts the front and back surfaces of the two adjacent blades 4c without any gap. The cross-sectional shape of the outer peripheral portion of the projecting portion 18c may be an arbitrary shape as necessary, that is, the accumulated dust may be sharpened in a blade shape so as to scrape off the accumulated dust, or the dust accumulated firmly can be shaved cheaply. The cross-sectional square having a high rigidity may be used, or the cross-sectional square having a chamfered shape so as to be slidable with small force. The central opening 18b provided in the central part is provided for the central boss part 4a of the fan 4 to pass therethrough.

  Further, rod-shaped handles 18d are provided upright at two opposing positions inside the central opening 18b of the blade cleaning plate 18, respectively. An engagement claw 18e that engages with the engagement hole 4e of the fan 4 described above is formed at the tip of the handle 18d on the substrate 18a side. On the other hand, the end portion on the opposite side of the handle 18d is formed as a handle portion 18f with a non-slip unevenness formed at a portion where the worker grips when cleaning. The grip 18d is supported by a support 18g extending from the substrate 18a with an intermediate portion as a fulcrum. When the grips 18f and 18f of the two handles 18d are grasped with one hand, the opposite end portion is held. And the engagement claw 18e is disengaged.

  The blade cleaning plate 18 is located at a standby position (position shown in FIGS. 1 and 4) that is the end of the fan 4 on the side of the motor 16 when not being cleaned (as described later, removed from the ventilation fan 100 when not in use). It is also possible to leave). The main plate 4b of the fan 4 and the substrate 18a of the blade cleaning plate 18 form a conical shape having substantially the same shape. In the standby position, the blade cleaning plate 18 is fixed to the fan 4 and does not come off due to the engagement structure of the engagement hole 4e with the engagement claw 18e. Further, during the operation of the fan 4, the blade cleaning plate 18 may come into close contact with the main plate 4b due to the wind pressure and centrifugal force generated by the operation of the fan 4 at this standby position, as shown in FIG. There is no vibration or noise. At this time, the main plate 4b of the fan 4 and the substrate 18a of the blade cleaning plate 18 form a conical shape having substantially the same shape, and therefore, when pressed by wind pressure and centrifugal force, they are held in a stable and easy state. Is done.

  Further, the blade cleaning plate 18 is reciprocated along the axis of the fan 4 by disengaging the engaging claw 18e from the engaging hole 4e when the operation of the fan 4 is stopped (in FIG. Slide motion). The blade cleaning plate 18 can reciprocate over substantially the entire axial direction of the fan 4. Since the blade cleaning plate 18 has a plurality of protrusions 18 c formed on the outer peripheral portion engaged with the blade 4 c over the entire periphery, the blade 4 c itself serves as a guide and can be moved stably in the axial direction of the fan 4. Can do. By reciprocating the blade cleaning plate 18, dust attached to and accumulated on the blade 4 c is scraped off by the protrusion 18 c. The blade cleaning plate 18 can be removed from the ventilation fan 100 when not in use.

  FIG. 7 is a perspective view showing the fan casing 23. FIG. 8 is a perspective view of the orifice ring 22 as viewed from the surface side. FIG. 9 is a perspective view of the orifice ring 22 as viewed from the back side. The orifice ring 22 is attached to the fan casing 23, and the surface is smoothly molded to form a suction port 19 and a ventilation path from the suction port 19 to the fan casing 23, and rectifies the air flowing into the apparatus (intake air flow). To do. On the other hand, the back surface of the orifice ring 22 is formed with a dust fall prevention wall over the entire circumference, and serves as a dust receiving portion 22c that captures dust that has fallen from the wing 4c when the wing 4c is cleaned.

  The orifice ring 22 of the present embodiment has locking pieces 22a at three positions on the peripheral edge, and storage gaps 23a into which the locking pieces 22a are respectively fitted are formed at the positions of the corresponding fan casings 23. The orifice ring 22 is fixed to the fan casing 23 by rotating and sliding. In addition, the fan casing 23 has a protrusion (bending stopper protrusion) 23b for preventing loosening at a predetermined position on the outer peripheral portion, and the peripheral edge of the corresponding orifice ring 22 is engaged with the protrusion 23b. A mating recess (rotation preventing recess) 22b is formed. The engagement between the two prevents the orifice ring 22 from falling off the fan casing 23 due to the locking piece 22a being disengaged from the housing gap 22a even if vibration occurs when the operation of the fan 4 is stopped. doing. The convex portion 23b and the concave portion 22b are detached when a force exceeding a predetermined level is applied, for example, when the orifice ring 22 is removed. The fan casing 23 may be provided with a locking piece and the orifice ring 22 may be provided with a storage gap. Further, the orifice ring 22 may be provided with a convex portion, and the fan casing 23 may be provided with a concave portion.

  The blade 4c can be cleaned by the blade cleaning plate 18 even with the orifice ring 22 attached. That is, by inserting a hand from the suction port 19, grasping the handle portions 18 f and 18 f of the two handles 18 d to disengage the engaging claws 18 e and reciprocating the blade cleaning plate 18, the projecting portion 18 c Dust adhering to and accumulating on the wing 4c is scraped off. The inner diameter of the orifice ring 22 is made smaller than the inner diameter of the blade 4 c of the fan 4, and the dust removed by the blade cleaning plate 18 is reliably collected in the dust receiving portion 22 c of the orifice ring 22. The dust accumulated in the dust receiving portion 22c can be discarded by removing the orifice ring 22 and cleaning it.

  In addition, although the said embodiment applies this invention to the ventilation fan for ducts, if it is a ventilation apparatus equipped with a cylindrical multiblade centrifugal fan, it can apply widely. As for the direction of the axis of the cylindrical multi-blade centrifugal fan, it is optimal because it can easily collect the falling dust if the axis of the fan is in the vertical direction like the ventilation fan of the above embodiment, Even if the fan shaft does not necessarily face the vertical direction, the fallen dust is somewhat difficult to remove, but an excellent effect can be obtained in terms of removing the dust accumulated on the wing.

  As described above, the ventilator according to the present invention is useful for a ventilator having a cylindrical multiblade centrifugal fan, and is particularly suitable for a ventilator installed in a state of being embedded in a ceiling structure or a wall structure. .

4 Cylindrical multi-blade centrifugal fan 4a Central boss 4b Main plate 4c Blade 4e Engagement hole 4f Press-fit portion 5 Press-fit spring 14 Outer shell 15 Multi-blade fan 16 Motor 18 Blade cleaning plate 18a Substrate 18b Central opening 18c Protruding portion 18d Handle 18e engaging claw 18f handle 18g support 19 suction port 20 discharge port 21 main body 22 orifice ring 22a locking piece 22b recess (rotating recess)
22c Dust receiving part 23 Fan casing 23a Storage gap 23b Convex part (rotation prevention convex part)
24 Duct Connection Frame 25 Shutter 26 Cosmetic Grill 27 Duct 28 Spring 29 Cosmetic Grill Hook 30 Mounting Screw 40 Ceiling Panel 50 Field Edge 60 Opening 100 Duct Ventilation Fan (Ventilation Device)

Claims (9)

A main body that forms a ventilation path from the suction port on the indoor side to the discharge port on the outdoor side;
A plurality of blades disposed in a fan casing constituting a part of the ventilation path, arranged substantially equidistantly on the outer periphery of the main plate and parallel to each other and parallel to the central axis; A cylindrical multiblade centrifugal fan having
A motor that connects a drive shaft to the cylindrical multi-blade centrifugal fan and drives the cylindrical multi-blade centrifugal fan to generate an air flow in the ventilation path;
A substantially circular substrate, and a plurality of protrusions formed in a comb-teeth shape outwardly on the entire outer periphery of the substrate and sandwiched between the adjacent blades, and the cylindrical multiblade A ventilation apparatus comprising: a blade cleaning plate provided so as to be reciprocally movable in an axial direction of the centrifugal fan. The ventilation device according to claim 1, wherein a cross-sectional shape of the protruding portion of the wing cleaning plate is the same as a cross-sectional shape between the adjacent wings.   The blade cleaning plate is detachably attached to the main body, and when the cylindrical multiblade centrifugal fan is in operation, the blade cleaning plate is held at a standby position on the motor side end of the cylindrical multiblade centrifugal fan. The ventilator according to claim 1 or 2, wherein The cylindrical multiblade centrifugal fan is connected to the motor by fitting a central boss portion provided at a central portion of the fan base portion into the drive shaft,
The blade cleaning plate has a central opening through which the central boss portion penetrates at a central portion, and an engagement claw that engages with an engagement hole formed around the central boss portion of the cylindrical multiblade centrifugal fan 4 at the inner edge of the central opening, and the engagement claw is engaged with the engagement hole and held at the standby position of the motor side end. The ventilator according to item 1. The substrate of the blade cleaning plate has a conical shape that is the same shape as the main plate of the cylindrical multiblade centrifugal fan. During operation of the cylindrical multiblade centrifugal fan, the blade cleaning plate is The ventilation apparatus according to any one of claims 1 to 4, wherein the ventilation apparatus is in close contact with the main plate of the blade centrifugal fan. An orifice ring that forms the suction port and rectifies the intake air flow during operation of the cylindrical multiblade centrifugal fan and further captures dust falling from the blade during blade cleaning, and the orifice ring includes the fan casing. The ventilation device according to any one of claims 1 to 5, wherein the ventilation device is detachably attached to the indoor side of the. The ventilator according to claim 6, wherein a hole diameter of the suction port formed in the orifice ring is smaller than an outer diameter of the cylindrical multiblade centrifugal fan. A locking piece projecting in the radial direction is provided on one of the facing surfaces of the orifice ring and the fan casing, and a storage gap for storing the locking piece is formed at a corresponding position on the other facing surface. The orifice ring is fixed to the fan casing when the orifice ring is rotated and slid against the fan casing to engage the retaining piece and the storage gap. The ventilator according to 7. An anti-rotation convex portion is provided on one facing surface of the orifice ring and the fan casing, and an anti-rotation concave portion is provided at a corresponding position on the other opposing surface, and the anti-rotation convex portion and the anti-rotation concave portion By fitting, the orifice ring is positioned at a predetermined angular position of the fan casing, and the anti-rotation convex portion and the anti-rotation concave portion are disengaged when a predetermined force or more is applied. The ventilator according to any one of claims 6 to 8.

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