AU2016423907B2

AU2016423907B2 - Ventilation blower

Info

Publication number: AU2016423907B2
Application number: AU2016423907A
Authority: AU
Inventors: Fukutaro NAGATA; Kaoru NAKATANI
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2016-09-20
Filing date: 2016-09-20
Publication date: 2019-12-05
Anticipated expiration: 2036-09-20
Also published as: JP6676179B2; JPWO2018055670A1; CN109690199A; WO2018055670A1; CN109690199B; NZ750394A; AU2016423907A1

Abstract

This ventilation air blower is provided with: a main body housing (2) provided with an air inlet and an air outlet; a centrifugal air blower provided inside the main body housing (2) and forming an airflow that flows into the main body housing (2) from the air inlet and flows out of the main body housing (2) from the air outlet; and a first capacitor box (62) and a second capacitor box (61) that are formed as bottomed boxes each having one surface open, that store capacitors (63a, 63b) for controlling an electric motor, and that are made of a non-combustible material. The first capacitor box (62) is provided with a first planar section (64b) extending outward from the periphery of the open surface, and is attached to the outside of the main body housing (2). The second capacitor box (61) is provided with a second planar section (64a) extending outward from the periphery of the open surface, and is embedded and installed in the main body housing (2). The open surface of the first capacitor box (62) is covered by the second planar section (64a), and the open surface of the second capacitor box (61) is covered by the first planar section (64b).

Description

Technical Field [0001] The present invention relates to a ventilation blower for exchanging indoor air through a duct leading to a room and a duct leading to the outside.

Background [0002] Conventionally, in order to prevent fire spreading due to ignition upon a short circuit, a capacitor for controlling an electric motor provided in a ventilation blower is housed in a resin case and the resin case is further protected by a metallic cover, or the capacitor is protected by covering an entire circumference of the capacitor with a metallic case and a metallic cover.

[0003] However, in a ventilation blower including a plurality of electric motors or a ventilation blower adjusting an air volume by capacitor partial pressure, a plurality of capacitors for controlling the electric motors are provided. It is cumbersome to attach a protective case and cover to each of the plurality of capacitors for controlling the electric motors, which thereby increases the number of parts and leads to deterioration of productivity. Therefore, there is a need for a ventilation blower that achieves both safety when a capacitor is ignited and high productivity.

[0004] It is desired to address or ameliorate one or more disadvantages or limitations associated with the prior art, or to at least provide a useful alternative.

Summary [0005] In accordance with at least one embodiment of the present invention, there is provided a ventilation blower comprising: a main body housing provided with an inlet port and an exhaust port; a blower including an electric motor and a blade detachably attached to a rotating shaft of the electric motor, the blower being embedded and installed inside the main body housing, and forming an air flow that flows into the main body housing from the inlet port and flows out of the main body housing from the exhaust port; and a first capacitor box and a second capacitor box each of which has a box shape opened on one plane, housing at least one capacitor for controlling the electric motor. The first capacitor box includes a first flat plate protruding around an open plane and the first capacitor bo is externally attached to the main body housing. The second capacitor box includes a second flat plate protruding around an open plane and the second capacitor box is embedded and installed in the main body housing.

The open plane of the first capacitor box is closed by the second flat plate, and the open plane of the second capacitor box is closed by the first flat plate.

[0006] An embodiment of the present invention further provides a ventilation blower comprising: a main body housing provided with an inlet port and an exhaust port; a blower including an electric motor and a blade detachably attached to a rotating shaft of the electric motor, the blower being installed inside the main body housing, the blower forming an air flow that flows into the main body housing from the inlet port and flows out of the main body housing from the exhaust port; and a first capacitor box and a second capacitor box each having a box shape opened on one plane, housing at least one capacitor for controlling the electric motor. The first capacitor box includes a first flat plate protruding around the open plane and is externally attached to the main body housing. The second capacitor box is embedded and installed in the main body housing. The open plane of the first capacitor box is closed by the main body housing, and the open plane of the second capacitor box is closed by the first flat plate .

[0007] A ventilation blower according to at least one embodiment of the present invention may suppress fire spreading when a capacitor for controlling an electric motor is ignited, and may achieve high productivity.

Brief Description of Drawings [0008] Preferred embodiments of the present invention are hereinafter described, by way of example only, with reference to the accompanying drawings, in which:

FIG. 1 is a perspective view of a ventilation blower according to a first embodiment of the present invention as viewed from an electric motor side.

FIG. 2 is a plan view of the ventilation blower according to the first embodiment.

FIG. 3 is a view illustrating a method of housing a capacitor of the ventilation blower according to the first embodiment.

FIG. 4 is a view illustrating a method of housing a capacitor of the ventilation blower according to the first embodiment.

FIG. 5 is a perspective view of a portion of a capacitor housing unit of the ventilation blower according to the first embodiment.

FIG. 6 is a sectional view of the portion of the capacitor housing unit of the ventilation blower according to the first embodiment.

FIG. 7 is an exploded perspective view of the capacitor housing unit of the ventilation blower according to the first embodiment.

FIG. 8 is a sectional view of a portion of a capacitor housing unit of a ventilation blower according to a modification of the first embodiment.

FIG. 9 is a sectional view of a capacitor housing unit of a ventilation blower according to a second embodiment of the present invention.

FIG. 10 is a sectional view of a capacitor housing unit of a ventilation blower according to a third embodiment of the present invention.

FIG. 11 is a sectional view of a capacitor housing unit of a ventilation blower according to a fourth embodiment of the present invention.

Detailed Description [0009] Hereinafter, a ventilation blower according to embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the present invention is not limited by the embodiments .

[0010] First Embodiment.

FIG. 1 is a perspective view of a ventilation blower according to a first embodiment of the present invention as seen from an electric motor side. FIG. 2 is a plan view of the ventilation blower according to the first embodiment. FIG. 2 illustrates the inside of a main body housing 2 by visualizing it while transmitting through a top plate of the main body housing 2. A ventilation blower 1 according to the first embodiment includes the main body housing 2 which constitutes an exterior and supports the entire blower. The main body housing 2 is rectangular parallelepiped in shape, and is provided with an inlet port 3 on one of two side surfaces facing each other in a longitudinal direction and an exhaust port 4 on another. A duct connection port 5a is provided in the inlet port 3, and a duct connection port 5b is provided in the exhaust port 4. A duct 6a is connected to the duct connection port 5a. A duct 6b is connected to the duct connection port 5b. [0011] Further, four suspension brackets 7 are provided on side surfaces of the main body housing 2. By fixing the suspension bracket 7 to an anchor bolt (not illustrated), the ventilation blower 1 is installed in a space such as a back of a ceiling of a building, and performs ventilation by sucking indoor air through the duct 6a and exhausting the air to the outside through the duct 6b. In other words the ventilation blower 1 forms an air flow between air on an indoor side and air on an outdoor side, and exchanges the indoor air via the duct 6a leading to the inside of a room and the duct 6b leading to the outside.

[0012] A centrifugal blower 20 is installed inside the main body housing 2. The centrifugal blower 20 includes an electric motor 22 mounted in the main body housing 2 by a motor mounting leg 21 and a double suction type multi-blade centrifugal blade 23 detachably attached to a rotating shaft of the electric motor 22. In a state in which the ventilation blower 1 is fixed, the air on the indoor side and the air on the outdoor side are ventilated. In other words, the centrifugal blower 20 is installed inside the main body housing 2, and forms an air flow that flows into the main body housing 2 from the inlet port 3 and flows out of the main body housing 2 from the exhaust port 4.

[0013] The centrifugal blower 20 is incorporated at a position closer to the exhaust port 4 than a center in the longitudinal direction of the main body housing 2 in such a manner that the rotating shaft of the electric motor 22 is horizontal or vertical.

[0014] As illustrated in FIG. 2, the multi-blade centrifugal blade 23 is surrounded by: an orifice 24 located on a side opposite to the electric motor 22 and having a suction port 30a; and an orifice 25 located on the electric motor 22 side and having a suction port 30b. The orifices 24 and 25 form a scroll casing having a discharge port 31. The electric motor 22 is located inside the suction port 30b, and the suction port 30a and the suction port 30b face each other in a rotating shaft direction of the electric motor 22. Further, the scroll casing guides the air on the indoor side to the multi-blade centrifugal blade 23.

[0015] During operation of the ventilation blower 1, the air taken into the ventilation blower 1 from the inlet port 3 through the duct 6a by rotation of the double suction type multi-blade centrifugal blade 23 is temporarily divided into the electric motor 22 side and the side opposite to the electric motor 22. The divided air passes through air passages 40a and 40b formed in the main body housing 2, enters the centrifugal blower 20 from the suction ports 30a and 30b, and merges together. The merged air is discharged from the discharge port 31 and exhausted from the duct 6b to the outside through the exhaust port 4. In the ventilation blower 1, a path from intake to exhaust is linearly laid out.

[0016] FIGS. 3 and 4 are views each illustrating a method of housing a capacitor of the ventilation blower according to the first embodiment. FIG. 5 is a perspective view of a portion of a capacitor housing unit of the ventilation blower according to the first embodiment. FIG. 6 is a sectional view of the portion of the capacitor housing unit of the ventilation blower according to the first embodiment. FIG. 7 is an exploded perspective view of the capacitor housing unit of the ventilation blower according to the first embodiment. A second capacitor box has a bottomed box shape with its top plane opened so as to house a capacitor 63a for controlling the electric motor 22, and includes a flat plate 64a which is a second flat plate protruding around an open plane. A first capacitor box 62 has a bottomed box shape with its top plane opened so as to house a capacitor 63b for controlling the electric motor 22, and includes a flat plate 64b which is a first flat plate protruding around an open plane.

[0017] The first capacitor box 62 and the second capacitor box 61 are made of an incombustible material. Examples of the incombustible material include metal and ceramic. The second capacitor box 61 is embedded and installed in the side surface of the main body housing 2. The first capacitor box 62 is externally attached to the side surface of the main body housing 2. In order to prevent fire spreading at the time of a capacitor short circuit, when assembled to the main body housing 2, the first capacitor box 62 and the second capacitor box 61 form a capacitor housing unit 60 by fitting the flat plates 64a and 64b to each other so as to cover the open planes. In other words, in the capacitor housing unit 60, the open plane of the second capacitor box 61 is closed by the flat plate 64b of the first capacitor box 62, and the open plane of the first capacitor box 62 is closed by the flat plate 64a of the second capacitor box 61.

[0018] The ventilation blower 1 according to the first embodiment does not need to additionally assemble a case or a cover made of an incombustible material that covers the periphery of the capacitors 63a and 63b. Therefore, it is possible to suppress fire spreading when the capacitor for controlling the electric motor 22 is ignited, and productivity is high. Further, in the ventilation blower 1 according to the first embodiment, assembly work is simplified by reducing the number of parts, work efficiency improves, and costs can be reduced.

[0019] FIG. 8 is a sectional view of a portion of a capacitor housing unit of a ventilation blower according to a modification of the first embodiment. The first capacitor box 62 that houses the capacitor 63b for controlling the electric motor 22 has a bottomed box shape with one plane opened, and includes the flat plate 64b which is the first flat plate protruding around the open plane. The second capacitor box 61 that houses the capacitor 63a for controlling the electric motor 22 has a bottomed box shape with one plane opened. The second capacitor box 61 is made of an incombustible material, and is embedded and installed in the main body housing 2. The first capacitor box 62 is made of an incombustible material and is externally attached to the main body housing 2.

[0020] The open plane of the first capacitor box 62 is closed by the main body housing 2, and the open plane of the second capacitor box 61 is closed by the flat plate 64b. Since the main body housing 2 constitutes a part of a cover made of an incombustible material and covers the open plane of the first capacitor box 62, it is not necessary to provide the flat plate 64a in the second capacitor box 61 embedded and installed in the main body housing 2. Therefore, when a sheet metal material is applied to the incombustible material, cost reduction can be realized by reducing a blank area of the sheet metal material and simplifying a mold.

[0021] In the above description, a configuration in which the capacitor housing unit 60 is provided on the side surface of the main body housing 2 of the ventilation blower 1 has been described. However, the position at which the capacitor housing unit 60 is provided is not limited to the side surface of the main body housing 2. The same effect can be obtained even when the capacitor housing unit 60 is provided on the top plate of the main body housing 2. Note that, when the capacitor housing unit 60 is provided on the side surface of the main body housing 2, maintenance work becomes easier than when the capacitor housing unit 60 is provided on the top plate of the main body housing 2.

[0022] Second Embodiment.

FIG. 9 is a sectional view of a capacitor housing unit of a ventilation blower according to a second embodiment of the present invention. In the second embodiment, the main body housing 2 is made of an incombustible material. As illustrated in FIG. 9, the second capacitor box 61 embedded and installed in the main body housing 2 is provided with an erected plate 65a which is a second erected plate rising vertically from a tip of the flat plate 64a. When the first capacitor box 62 is attached to the main body housing 2, the erected plate 65a is inserted into the first capacitor box 62 and forms a partition wall that partitions an internal space of the first capacitor box 62 into two. Therefore, when two capacitors 63c and 63d are housed in the first capacitor box 62, a space between the capacitor 63c and the capacitor 63d is separated by the partition wall formed by the erected plate 65a. The flat plate 64a does not exist between the capacitor 63d and the main body housing 2. However, since an entire circumference of the capacitor 63d is surrounded by the first capacitor box 62 made of the incombustible material and the main body housing 2 made of the incombustible material, fire spreading is prevented when a fire is started from the capacitor 63c or 63d.

[0023] The ventilation blower according to the second embodiment can ensure safety against the fire spreading when the capacitor is short-circuited, without using parts in addition to the first capacitor box 62 and the second capacitor box 61, and it is possible to reduce costs by reducing the number of parts and improving easiness of assembly.

[0024] Third Embodiment.

FIG. 10 is a sectional view of a capacitor housing unit of a ventilation blower according to a third embodiment of the present invention. As illustrated in FIG.

10, the first capacitor box 62 attached to the main body housing 2 is provided with an erected plate 65b which is a first erected plate extending vertically from a tip of the flat plate 64b. When the first capacitor box 62 is attached to the main body housing 2, the erected plate 65b is inserted into the second capacitor box 61 and forms a partition wall that partitions an internal space of the second capacitor box 61 into two. Therefore, when two capacitors 63e and 63f are housed in the second capacitor box 61, a space between the capacitor 63e and the capacitor 63f is separated by the partition wall formed by the erected plate 65b. Therefore, it is possible to ensure safety against fire spreading when the capacitor is shortcircuited, without using parts in addition to the first capacitor box 62 and the second capacitor box 61, and it is possible to reduce costs by reducing the number of parts and improving easiness of assembly.

[0025] Fourth Embodiment.

FIG. 11 is a sectional view of a capacitor housing unit of a ventilation blower according to a fourth embodiment of the present invention. As illustrated in FIG.

11, the second capacitor box 61 embedded and installed in the main body housing 2 is provided with a protrusion 66 on a bottom thereof, and the second capacitor box 61 includes two capacitor housing spaces. The capacitor 63e is housed in one of the housing spaces of the second capacitor box 61 and the capacitor 63f is housed in another. By providing the protrusion 66 on the bottom of the second capacitor box

61, positions of the capacitors 63e and 63f within the second capacitor box 61 are prevented from being shifted. [0026] Since an opening of the second capacitor box 61 is closed by the flat plate 64b of the first capacitor box

62, an entire circumference of the capacitors 63e and 63f is covered. Therefore, even when fire occurs from one of the capacitors 63e and 63f, fire spreading in the second capacitor box 61 is stopped. Accordingly, without using parts in addition to the first capacitor box 62 and the second capacitor box 61, it is possible to secure safety against fire spreading when the capacitor is shortcircuited, and it is possible to reduce costs by reducing the number of parts and improving easiness of assembly. [0027] Here, a configuration in which one protrusion 66 is provided on the bottom of the second capacitor box 61 embedded and installed in the ventilation blower 1 and the capacitors 63e and 63f are housed in the protrusion 66 has been described. However, it is needless to say that the same effect can be obtained by providing a protrusion on a bottom of the first capacitor box 62 externally attached to the main body housing 2. Further, the number of protrusions is not limited, and it goes without saying that the effect of preventing displacement of the capacitor can be similarly obtained even if the number of protrusions increases .

[0028] The configuration illustrated in the above embodiments illustrates one example of the contents of the present invention and can be combined with another known technique, and it is also possible to omit and change a part of the configuration without departing from the gist of the present invention.

[0029] Throughout this specification and the claims which follow, unless the context requires otherwise, the word comprise, and variations such as comprises and comprising, will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.

[0030] The reference in this specification to any prior publication (or information derived from it), or to any matter which is known, is not, and should not be taken as an acknowledgment or admission or any form of suggestion that that prior publication (or information derived from it) or known matter forms part of the common general knowledge in the field of endeavour to which this specification relates.

Reference Signs List [0029] 1 ventilation blower; 2 main body housing; 3 inlet port; 4 exhaust port; 5a, 5b duct connection port; 6a, 6b duct; 7 suspension bracket; 20 centrifugal blower; 21 motor mounting leg; 22 electric motor; 23 multi-blade centrifugal blade; 24, 25 orifice; 30a, 30b suction port; 31 discharge port; 40a, 40b air passage; 60 capacitor housing unit; 61 second capacitor box; 62 first capacitor box; 63a, 63b, 63c, 63d, 63e, 63f capacitor; 64a 64b flat plate; 65a, 65b erected plate.

Claims

THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:

1. A ventilation blower comprising:

a main body housing provided with an inlet port and an exhaust port;

a blower including an electric motor and a blade detachably attached to a rotating shaft of the electric motor, the blower being embedded and installed in the main body housing, the blower forming an air flow that flows into the main body housing from the inlet port and flows out of the main body housing from the exhaust port; and a first capacitor box and a second capacitor box each having a box shape opened on one plane, housing at least one capacitor for controlling the electric motor, wherein the first capacitor box includes a first flat plate protruding around the open plane and is externally attached to the main body housing, the second capacitor box includes a second flat plate protruding around an open plane and is embedded and installed in the main body housing, and the open plane of the first capacitor box is closed by the second flat plate, and the open plane of the second capacitor box is closed by the first flat plate.
2. The ventilation blower according to claim 1, wherein two of the first capacitor boxes are externally attached to the main body housing, at least one of the first capacitor boxes includes a first erected plate extending from an end of the first flat plate, the first erected plate forms a partition wall that partitions an inside of the second capacitor box into two spaces, and the second capacitor box houses the capacitors one by one in the two spaces partitioned by the first erected plate .
3. A ventilation blower comprising:

a main body housing provided with an inlet port and an exhaust port;

a blower including an electric motor and a blade detachably attached to a rotating shaft of the electric motor, the blower being installed inside the main body housing, the blower forming an air flow that flows into the main body housing from the inlet port and flows out of the main body housing from the exhaust port; and a first capacitor box and a second capacitor box each having a box shape opened on one plane, housing at least one capacitor for controlling the electric motor, wherein the first capacitor box includes a first flat plate protruding around the open plane and is externally attached to the main body housing, the second capacitor box is embedded and installed in the main body housing, and the open plane of the first capacitor box is closed by the main body housing, and the open plane of the second capacitor box is closed by the first flat plate.
4. The ventilation blower according to claim 3, wherein the second capacitor box includes a second flat plate protruding around the open plane and a second erected plate rising from an end of the second flat plate, a part of the open plane of the first capacitor box is closed by the second flat plate, the second erected plate forms a partition wall that partitions an inside of the first capacitor box into two spaces, and the first capacitor box houses the capacitors one by one in the two spaces partitioned by the second erected plate .

2016423907 21 Mar 2019
5 5. The ventilation blower according to any one of claims

1 to 4, wherein at least one of the first capacitor box and the second capacitor box includes a protrusion on a bottom thereof .