JP2004100585A - Centrifugal fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a centrifugal fan, in which air-supply performance is not degraded and noise is not caused, even when functional units 120 are placed in an air-flow path. <P>SOLUTION: An electric power part 125, etc. having no need of ventilation among the functional units 120 are placed in a position off the main current in the air-flow path. Thus, in the centrifugal fan 110, air-supply performance is not degraded, even though the units 120 are placed in the air-flow path, and noise such as wind noise is not caused, because the air hardly hits the power part 125, etc. Since the units 120 can be accommodated in the air-flow path, the enclosure becomes small and simple, and the mountability to vehicles and the like becomes favorable. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a centrifugal blower provided in a ventilation path for acting on air passing therethrough, and is effective when applied to a vehicle air purifier or a blower of a ceiling-mounted air conditioner.
[0002]
[Prior art]
As a prior art, as in a vehicle air purifier described in Japanese Patent Application Laid-Open No. 2002-46463, air passing through a ventilation path from a centrifugal multi-blade fan (hereinafter abbreviated as a fan) to an air outlet is provided. There is a blower provided with a functional unit that provides an action. In the above publication, a filter carrying a photocatalyst and a light source for irradiating ultraviolet light are provided as functional units.
[0003]
FIG. 7 is a schematic front view of such an air purifier 100 according to the related art, where 111 is a fan, 112 is a motor, 113 is a casing, and 122 and 123 are filters in which a dustproof filter and a photocatalytic filter are combined. , 124 are ultraviolet lamps, and 125 is its power supply.
[0004]
[Problems to be solved by the invention]
When a functional unit that acts on the passing air is provided in the air passage, the functional unit is arranged in the main stream of the wind flow in order to more effectively act. In the example of FIG. 7 as well, the filters 122 and 123 are arranged in the wind flow, and the ultraviolet lamp 124 (and the power supply section 125) is arranged in the main flow of the wind flow in order to properly apply the ultraviolet light to the entire surface of the filters 122 and 123. are doing.
[0005]
However, the functional unit is not only a part that must be completely placed in the wind current. For example, in the above example, the power supply part 125 reduces the air volume by increasing the pressure loss by blocking the air flow, There is a problem that noise such as sound also occurs. However, separating the power supply and placing it outside the ventilation path inevitably increases the size of the external shape, which makes it difficult to fit in a limited space, and reduces the mountability. However, there is a problem that the cost is increased in terms of assembly and the appearance is deteriorated.
[0006]
The present invention has been made in view of the above-described problems of the related art, and an object of the present invention is to arrange a functional unit in a ventilation path without impairing ventilation performance and without generating noise. An object of the present invention is to provide an air blower.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the technical means described in claims 1 to 5 is adopted. In other words, according to the first aspect of the present invention, the centrifugal blower has a large number of blades (111a) around the rotation axis (112a) and blows out air taken in from the axial direction of the rotation axis (112a) outward. A casing (113) accommodating the multi-blade fan (111), the centrifugal multi-blade fan (111), and having an air outlet (114) for blowing air, and an air outlet from the fan (111) of the casing (113). In a centrifugal blower provided with a functional unit (120) that acts on the passing air in the ventilation path up to (114), the functional unit (120) is located at a position deviated from the main flow of the air flow in the ventilation path. It is characterized by arranging a part that does not require ventilation in it.
[0008]
Thus, the ventilation performance is not impaired when the functional unit (120) is arranged in the ventilation path, and noise such as wind noise is not generated because the power supply portion (125) is hardly hit by wind. It can be a centrifugal blower (110). Further, since the functional unit (120) can be stored in the ventilation path as it is, the external shape can be made small and neat box-shaped, and the mountability to a vehicle or the like is excellent.
[0009]
According to the second aspect of the present invention, the position deviating from the main flow of the wind flow in the ventilation passage is defined as a dead end of the wind flow generated by the nose portion (113c) of the scroll shape (113a) formed in the casing (113). It is a space.
[0010]
This is because a scroll shape (113a) in which an air flow path is wound is formed on the outer diameter side of the fan (111) in the casing (113), and the main flow of the air blows near the center of the outlet (114). A nose portion (113c) protruding inward of the casing (113) may be formed at the rear end of the scroll shape (113a) so that the dead space of the wind flow generated by the nose portion (113c) may be provided. Focused on and used.
[0011]
However, if the position is deviated from the main flow of the air flow in the ventilation path, a decrease in the air volume is avoided even if the dead space of the air flow is not a clear dead space other than the dead space of the air flow generated by the nose portion (113c). And the effect of preventing the generation of noise can be sufficiently obtained.
[0012]
The invention according to claim 3 is characterized in that the casing (113) has a plurality of outlets (114). This is due to the fact that it is effective for a blower of multi-directional blowing like the air purifier of two-directional blowing shown in the embodiment.
[0013]
In the invention described in claim 4, the functional unit (120) is one of a photocatalytic unit having an ultraviolet light source, a negative ion generating unit, a fragrance generating unit, an ozone deodorizing unit, and a plasma deodorizing unit. . As described above, the functional unit (120) is effective when the present invention is applied to a unit that acts on the passing air.
[0014]
In the invention described in claim 5, the portions that do not require ventilation are the power supply unit (125) and the control circuit unit of the functional unit (120). As described above, when the airflow is in the mainstream of the airflow, the airflow is blocked, so that the pressure loss is increased to reduce the airflow, and the present invention is effectively applied to a portion where noise such as wind noise is also generated. Incidentally, the reference numerals in the parentheses of the above-described units are examples showing the correspondence with specific units described in the embodiments described later.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. This embodiment is one in which the blower according to the present invention is applied to a vehicle air purifier for purifying vehicle interior air, and FIG. 1 shows a state where the air purifier 100 is assembled to a rear package tray 200 of the vehicle. FIG. 2 is a perspective view of the interior of the vehicle, and FIG. 2 is a front view of the air purifier 100 for a vehicle.
[0016]
The air purifier 100 of the present embodiment starts or stops the operation by an output signal of a smoke sensor (not shown) for detecting the degree of contamination or a manual switch (not shown) operated by an occupant. During operation, as shown in FIG. Air is introduced into the interior through an inlet 101 provided at a substantially central portion of the air purifier 100, and the purified air is blown into the vehicle interior from an outlet 102.
[0017]
Next, the blower 110 according to the present embodiment will be described. FIG. 3 is a cross-sectional view (BB of FIG. 4) of the blower 110 according to the present embodiment, and FIG. 4 is a cross-sectional view of AA of FIG. Reference numeral 111 denotes a centrifugal multi-blade fan (hereinafter, abbreviated as a fan) having a large number of blades (blades) 111a around a rotation shaft 112a and blowing out air taken in from the axial direction of the rotation shaft 112a outward. In this embodiment, a rearward vane fan (turbo fan) having a blade outlet angle of the blade 111a larger than 90 ° is employed.
[0018]
As shown in FIG. 3, the fan 111 is housed in a casing 113 made of resin (in the present embodiment, polypropylene), and the casing 113 has a plurality of outlets 114 for blowing air. In the embodiment, two) are formed. A photocatalyst unit 120 for purifying air is provided as a functional unit that acts on air blown out from the fan 111 on the side of the outlet 113 in the casing 113.
[0019]
Then, on the outer diameter side of the fan 111 in the casing 113, the winding angle of the air flow path starting from about the middle of the casing width and turning substantially 180 ° to the vicinity of the center of the outlet 114 on the opposite side and the main flow of the air blows toward Are formed on both sides of the casing 113 in the width direction. Therefore, nose portions 113b and 113c projecting inward of the casing 113 are formed before and after the scroll shape 113a.
[0020]
In the present embodiment, the inner space of the nose portions 113b and 113c is used as the fastening portion 113d of the upper and lower casings 113, and the casing 113 has a simple box shape.
[0021]
Incidentally, in FIG. 4, reference numeral 115 denotes a suction port that guides the air introduced from the introduction port 101 into the casing 113. A bell mouth 113e for guiding is integrally formed with the casing 113. Reference numeral 112 denotes an electric motor (driving means) for driving the fan 111, which controls the operation of the air purifier 100 by ON-OFF controlling the electric motor.
[0022]
Next, the photocatalyst unit 120 according to the present embodiment will be described. FIG. 5 is an exploded perspective view showing a configuration of the photocatalyst unit 120 according to the embodiment of the present invention, and FIG. 6 is a schematic cross-sectional view of the photocatalyst unit 120 of FIG. A dust filter 122 for removing dust and cigarette smoke in the air, a photocatalyst filter 123 for decomposing and removing odor components in the air, and an ultraviolet lamp 124 for activating the photocatalyst are provided between the cases 121. It is stored as shown in the figure.
[0023]
The ultraviolet lamp 124 is a surface light source so as not to hinder ventilation as much as possible. The case 121 is made of a material that blocks radio noise from the ultraviolet lamp 124, and has a shield net 126 having air permeability on both sides. A power supply section 125 for supplying power to the ultraviolet lamp 124 is provided at one end in the longitudinal direction of these filter sections to constitute the photocatalyst unit 120, and has a structure that can be easily attached to and detached from the casing 113.
[0024]
Next, features of the present embodiment will be described. At a position deviated from the main flow of the air flow in the ventilation path, a power supply portion 125 and the like in the functional unit 120 that do not require ventilation are arranged. Thus, the centrifugal blower 110 does not impair the air blowing performance when arranging the functional unit 120 in the ventilation path, and does not generate a noise such as a wind noise because the wind does not easily hit the power supply portion 125 and the like. It can be. In addition, since the functional unit 120 can be stored in the ventilation path as it is, the external shape can be made small and neat box-shaped, so that it can be easily mounted on a vehicle or the like.
[0025]
The position deviating from the main flow of the air flow in the ventilation path refers to the dead space of the air flow generated by the nose portion 113c of the scroll shape 113a formed in the casing 113.
[0026]
In this case, a scroll shape 113a in which an air flow path is wound is formed on the outer diameter side of the fan 111 in the casing 113, and a rear end of the scroll shape 113a is formed so that the main flow of the air blows near the center of the outlet 114. In some cases, a nose portion 113c protruding inward of the casing 113 is formed. In this embodiment, the dead space of the wind flow generated by the nose portion 113c is focused on and used.
[0027]
However, if it is located at a position deviated from the main flow of the wind flow in the ventilation path, even if it is not a dead space of the wind flow other than the dead space of the wind flow generated by the nose portion 113c, it is possible to avoid a decrease in the air volume or to reduce the noise. The effect of preventing the generation of satisfactorily can be obtained.
[0028]
The casing 113 has a plurality of outlets 114. This is effective for a blower of multi-directional blowing like the air purifier for two-directional blowing shown in the present embodiment. The functional unit 120 may be any of a negative ion generating unit, a scent generating unit, an ozone deodorizing unit, and a plasma deodorizing unit, in addition to the photocatalytic unit of the present embodiment. As described above, the functional unit 120 is effective when the present invention is applied to a unit that acts on the passing air.
[0029]
The portions that do not require ventilation are the power supply unit 125 and the control circuit unit of the functional unit 120. As described above, when the airflow is in the mainstream of the airflow, the airflow is blocked, so that the pressure loss is increased to reduce the airflow, and the present invention is effectively applied to a portion where noise such as wind noise is also generated.
[0030]
(Other embodiments)
In the above-described embodiment, the number of the outlets 114 of the blower 110 is two, but the present invention is not limited to this, and the present invention can be applied to an outlet having three or more outlets. Further, in the above-described embodiment, the blower according to the present invention is applied to the air purifier for a vehicle, but the present invention is not limited to this, and may be applied to other devices such as a ceiling embedded air conditioner. be able to.
[0031]
Further, in the above-described embodiment, the rearward vane fan having a fan outlet angle larger than 90 ° is used, but a forward vane fan having a fan outlet angle of 90 ° or less may be used.
[Brief description of the drawings]
FIG. 1 is a perspective view of the interior of a vehicle equipped with an air purifier using a blower according to an embodiment of the present invention.
FIG. 2 is a plan view of an air purifier using the blower according to the embodiment of the present invention.
FIG. 3 is a plan sectional view of the blower according to the embodiment of the present invention.
FIG. 4 is a sectional view taken along line AA of FIG. 3;
FIG. 5 is an exploded perspective view showing a configuration of a photocatalyst unit according to the embodiment of the present invention.
FIG. 6 is a schematic sectional view of the photocatalytic unit of FIG.
FIG. 7 is a schematic front view of an air purifier according to the related art.
[Explanation of symbols]
111 Centrifugal multi-blade fan 111a Blade 112a Rotating shaft 113 Casing 113a Scroll shape 113c Nose part 114 Outlet 120 Photocatalytic unit (functional unit)
125 power supply

Claims (5)

A centrifugal multi-blade fan (111) having a number of blades (111a) around a rotation axis (112a) and blowing out air taken in from the axial direction of the rotation axis (112a) radially outward;
A casing (113) accommodating the centrifugal multi-blade fan (111) and having an outlet (114) for blowing air;
A centrifugal blower having a functional unit (120) for acting on passing air in an air passage from the fan (111) to the air outlet (114) of the casing (113);
A centrifugal blower, wherein a portion of the functional unit (120) that does not require ventilation is arranged at a position deviating from a main flow of the airflow in the ventilation path. The position deviating from the main flow of the air flow in the ventilation path is a dead space of the air flow generated by a nose portion (113c) of a scroll shape (113a) formed in the casing (113). The centrifugal blower according to claim 1. The centrifugal blower according to claim 1, wherein the casing (113) has a plurality of the outlets (114). The centrifugal type according to claim 1, wherein the functional unit (120) is any one of a photocatalytic unit having an ultraviolet light source, a negative ion generating unit, a fragrance generating unit, an ozone deodorizing unit, and a plasma deodorizing unit. Blower. The centrifugal blower according to claim 1, wherein the portion that does not require ventilation is a power supply unit (125) or a control circuit unit of the functional unit (120).

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