JP7090218B2 - Sirocco fan impeller, range hood using it - Google Patents

Description

The present invention relates to a sirocco fan used in a range hood that emits oily smoke during cooking.

For range hoods that are installed in kitchens and exhaust air mixed with oil and dust from stoves, etc., conventional oils and fats in waste gas generated during cooking are captured by a filter and discharged outdoors. It is required to reduce the minutes. A sirocco fan of this type of range hood is disclosed in which a ring-shaped oil collecting portion is provided inside, that is, in a space for sucking air, in which air containing oil is brought into contact with the oil to adhere to it (. For example, Patent Document 1).

As shown in FIG. 11, the oil collecting portion 101 in the sirocco fan of the conventional range hood is formed by stacking ring-shaped collecting rings 104. The collection ring 104 has a plurality of recesses 102 on the outer peripheral side into which the blade of the sirocco fan is fitted. The oil collecting portion 101 is formed by stacking the collecting rings 104 via a plurality of holding portions 103 in the rotation axis direction. That is, the holding portion 103 can be said to be a spacer provided between the plurality of collecting rings 104. Further, in this sirocco fan, an impeller is formed by inserting blades one by one from the outer peripheral side of the oil collecting portion 101. The blades are separated one by one, and in the process of inserting the blades, it is necessary to hold the oil collecting unit 101 and hold the blades one by one.

Japanese Unexamined Patent Publication No. 2013-148269

In such a conventional range hood sirocco fan, the structure is complicated because the holding portion is interposed between the oil collecting portions. Further, there is a problem that the holding portion becomes a resistance on the air passage and lowers the blowing efficiency.

Further, in the manufacturing process of such a sirocco fan, a step of assembling an integrated oil collecting unit by stacking an oil collecting unit and a holding unit is required. Further, since the blades are inserted one by one from the outer peripheral side, a lot of labor is required.

Therefore, the present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a sirocco fan having a simple structure and obtained by a simple manufacturing method, and a range hood using the sirocco fan.

And the impeller of the sirocco fan of the present invention
A blade plate formed by cutting multiple blades from a strip-shaped metal plate at approximately equal intervals,
It is made of metal and has an annular and plate-shaped inner ring.
A plurality of slits cut toward the inner peripheral side are provided on the outer peripheral side of the inner peripheral ring.
The blade plate is provided on the outer peripheral side of the inner peripheral ring so as to have a cylindrical shape.
The blade has a notch on the inner peripheral side and has a notch.
The slit of the inner peripheral ring and the notch of the blade are opposed to each other and fitted to each other.
At least two blade plates are used, and they are radially overlapped on the inner peripheral side and the outer peripheral side to form a cylindrical shape.
The inner peripheral ring alternately fits the blade of the blade plate on the inner peripheral side and the blade of the blade plate on the outer peripheral side.
The notch provided in the blade on the inner peripheral side and the notch provided in the blade on the outer peripheral side are provided so as to be offset by a predetermined distance in the direction of the rotation axis .

According to this configuration, a blade plate having a blade can be wound around the outer peripheral side of the inner peripheral ring to be integrated, so that the process can be simplified, the number of parts is small, and the sirocco has high ventilation efficiency. Can provide fans.

A perspective view showing an impeller of a sirocco fan according to the first embodiment of the present invention. Cross-sectional perspective view of the impeller of the sirocco fan A perspective view showing the blade plates constituting the impeller of the sirocco fan. Top view of the inner ring that constitutes the impeller of the sirocco fan The figure which shows the assembly state of the impeller of the sirocco fan Perspective view of the blade plate in the assembly process of the impeller of the sirocco fan Perspective view of the blade plate in the double state in the assembly process of the impeller of the sirocco fan Enlarged view of the double blade plate in the assembly process of the impeller of the sirocco fan Cut perspective view of the fan ring of the impeller of the same sirocco fan Enlarged view of the caulked part with the fan ring in the assembly process of the impeller of the sirocco fan Perspective view showing an oil collecting part in a conventional sirocco fan impeller

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments are examples that embody the present invention and do not limit the technical scope of the present invention. In addition, the same parts are designated by the same reference numerals throughout the drawings, and the second and subsequent explanations are omitted. Further, in each drawing, the details of each part not directly related to the present invention are omitted.

(First Embodiment)
First, the impeller 1 of the sirocco fan of the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is an external perspective view of the impeller 1, and FIG. 2 is a perspective view when the impeller 1 is cut in the rotation axis direction.

The impeller 1 is provided with a plurality of blades 4 between a disk-shaped fan base 2 and a ring-shaped fan ring 3. In other words, the impeller 1 is integrated so as to be sandwiched between the fan base 2 and the fan ring 3 from the rotation axis direction in a state where the plurality of blades 4 are arranged in an annular shape with the longitudinal direction of the blades 4 in the rotation axis direction. A plurality of inner peripheral rings 5 are provided on the inner peripheral side of the blade 4. The inner peripheral ring 5 is formed by hollowing out a metal plate into an annular shape. In the impeller 1 of the present embodiment, a plurality of inner peripheral rings 5 are provided on the inner peripheral side of the blades 4 arranged in an annular shape in the direction of the rotation axis.

A through hole 2a for passing a rotation shaft is provided in the center of the fan base 2. Further, the fan base 2 in the dismantling of the present implementation has a conical trapezoidal shape at the center. When assembled as a blower, the motor is placed in the recessed portion of the fan base 2. The recessed portion of the fan base 2 refers to a conical trapezoidal recessed portion in the center of the fan base 2.

The impeller 1 of the present embodiment will be described with reference to FIGS. 3 to 9 along with the manufacturing process thereof.

FIG. 3 is a diagram showing a state in which the blade 4 is cut and raised from the blade plate 6 which is a strip-shaped metal plate. The strip-shaped blade plate 6 has a plurality of blades 4 integrally formed with the long side thereof as the support side 61. That is, the blade 4 is formed by cutting and raising the blade 4 with the direction orthogonal to the support side 61 of the blade plate 6 as the long side of the blade 4 and the support side 61 side as the fulcrum. The blades 4 are provided at substantially equal intervals in the longitudinal direction of the blade plate 6.

A notch 41 is provided on one long side of the blade 4. In FIG. 3, a notch 41 is provided above the blade 4. As will be described in detail later, one side provided with the notch 41 is the inner peripheral side of the impeller 1. A plurality of notches 41 are provided for one blade 4, and the number of notches 41 per blade 4 corresponds to the number of notches 41 to which the inner peripheral ring 5 can be mounted.

Further, the support side 61 is provided with a tongue-shaped caulking margin portion 7 protruding outward. The caulking margin portion 7 has a crease parallel to the support side 61 and has an L-shaped cross section. The crease is on the tip end side of the caulking margin portion 7 with respect to the end portion of the support side 61, that is, only the caulking margin portion 7 has an L-shaped cross section.

FIG. 4 is a plan view of the inner peripheral ring 5. The inner peripheral ring 5 is formed by punching a central portion of a metal plate into a ring shape. The inner peripheral side end of the inner peripheral ring 5 is bent in the front (or back) direction like a bell mouth. The outer peripheral side of the inner peripheral ring 5 has a shape in which unevenness is repeated at a predetermined cycle. A slit 8a is provided at substantially the center of the convex portion 8. The recess 9 has a shape that secures a predetermined width. As shown in FIG. 4, in the inner peripheral ring 5 of the present embodiment, two concave portions 9 are arranged between the convex portion 8 and the convex portion 8.

The slit 8a has a shape cut from the outer peripheral end portion of the convex portion 8 toward the center of the annulus. However, this cutting direction is provided according to the inclination of the inner peripheral end of the blade 4 described later, and may not be the center direction of the annulus in a strict sense. A C surface or an R shape is provided at the open end of the slit 8a, and the width is the widest at the open end of the slit 8a.

FIGS. 5, 6 and 7 show a state in which the blade plate 6 having the blade 4 formed around the inner peripheral ring 5 is wound around the inner peripheral ring 5. In the present embodiment, the blade plate 6 on which the blade 4 is formed is wound around twice to assemble the impeller assembly 11, so that the blade plate 6a and the blade 4a are provided on the inside and the blade plate 6b and the blade 4b are provided on the outside. Shall be provided.

As shown in FIG. 5, the inner peripheral ring 5 is held at a predetermined interval (interval between notches 41 formed in the blade 4a). In this state, the surface of the blade 4a on the inner peripheral side, that is, the side of the blade 4a provided with the notch 41 is opposed to the outer peripheral side of the inner peripheral ring 5. Then, the slits 8a of the plurality of inner peripheral rings 5 are opposed to each of the notches 41 of one blade 4a and fitted to each other. At this time, since the open end of the slit 8a has a C surface or an R shape, it is easy to insert the blade 4a. Further, in this state, the blade 4a and the inner peripheral ring 5 are fitted in the winding direction. In the present embodiment, after the blade 4a is inserted into the slit 8a of the inner peripheral ring 5, the adjacent blade 4a corresponds to the two adjacent recesses 9. The blade 4a next to it corresponds to the concave portion 9 at the tip of the adjacent convex portion 8. FIG. 6 shows a state in which the blade plate 6a has been wound for one round in this way. A caulking margin portion 7 protrudes in the outer peripheral direction from the end portion of the impeller assembly 10 in the rotation axis direction. The blade 4a on the first lap corresponds to the position A shown in FIG. 4 on the inner ring 5.

Next, the blade plate 6b is further wound on the outer peripheral side of the impeller set 10 in the state where one round has been wound. The blade 4b on the second lap is wound so as to correspond to the position B shown in FIG. That is, the blades 4b are located between the blades 4a, and the blades 4a and the blades 4b are alternately arranged in the circumferential direction. In this way, the impeller set 11 in a state where the blade plate 6 having the blade 4 is wound twice is formed (FIG. 7). In the impeller assembly 11, the caulking margin portion 7 formed on the blade plate 6b is arranged between the caulking margin portions 7 in the impeller assembly 10, that is, between the caulking margin portions 7 formed on the blade plate 6a.

In the present embodiment, the position of the notch 41 of the blade 4a and the position of the notch 41 of the blade 4b are shifted by a predetermined distance in the rotation axis direction. That is, as shown in FIG. 8, in the impeller assembly 11 in which the blade plate 6a having the blade 4a and the blade plate 6b having the blade 4b are wound, the blade plate 6a and the blade plate 6b are in the rotation axis direction. It is in a state of being displaced.

Next, a step of attaching the fan base 2 and the fan ring 3 from both sides in the rotation axis direction of the impeller assembly 11 will be described.

At the outer peripheral end of the impeller assembly 11, the support side 61 and the caulking margin portion 7 are formed in an annular shape. The fan base 2 and the fan ring 3 are provided with a groove 12 on the outer peripheral side. Only the fan ring 3 is enlarged and shown in FIG. The groove 12 has a shape recessed in the direction of the rotation axis, and is formed continuously around the fan base 2 and the fan ring 3 once. The width of the groove 12 is the same as or slightly larger than the length from the crease to the tip of the caulking margin 7. In such a configuration, the fan base 2 and the fan ring 3 are in the state of the impeller 1 by fitting the end portion of the impeller set 11 in the rotation axis direction into the groove 12 each of the fan base 2 and the fan ring 3. That is, the caulking margin portion 7 and the support side 61 are inserted into the groove 12.

In the present embodiment, the caulking margin portion 7 is configured to project in the outer peripheral direction with the blade plate 6 wound in a cylindrical shape, but it may be configured to project toward the inner peripheral side. That is, the caulking margin portion 7 may be formed so as to project in the radial direction in a state where the blade plate 6 is wound in a cylindrical shape.

As described above, in the state of the impeller set 11, the blade plate 6a and the blade plate 6b are held in a state of being displaced in the rotation axis direction (FIG. 8). In this state, the fan base 2 and the fan ring 3 are attached, and the winding is performed in a state where the fan base 2 and the fan ring 3 are pressed against each other in the direction of the rotation axis, and the blade plate 6a, the blade plate 6b, the fan base 2, and the fan ring 3 are integrated. At this time, the blade plate 6a and the blade plate 6b are pushed in opposite directions in the direction of the rotation axis. Here, since the inner peripheral ring 5 is fixed in the rotation axis direction by the notch 41 of the blade 4, it is pushed in opposite directions at the positions A and B in FIG. As a result, the inner peripheral ring 5 is fixed in a shape that undulates in the circumferential direction. Further, the caulking process is completed by compressing the grooves 12 of the fan base 2 and the fan ring 3 in the radial direction from the outside (FIG. 10).

In such an impeller 1 of a sirocco fan, first, since the blade 4 is integrated with the blade plate 6, the step of inserting each blade 4 becomes unnecessary. Then, the impeller 1 can be manufactured by a simple operation of winding the blade plate 6 around the inner peripheral ring 5.

Further, the inner peripheral ring 5 is provided with a convex portion 8 and a concave portion 9, and only the slit 8a provided in the convex portion 8 is fitted with the blade 4. That is, not all the blades 4 are fitted, and in the present embodiment, one-third of the blades 4 are inserted into the slit 8a, which simplifies the work process.

Further, the impeller 1 of the present embodiment has a double structure in which the blade plate 6a is wound and then the blade plate 6b is wound. Therefore, the width (length in the direction orthogonal to the rotation axis) of the blade 4 formed by cutting and raising can be increased. More specifically, when the blade plate 6 is wound only once, the length of the blade plate 6 in the longitudinal direction is limited to one circumference of the impeller 1. Therefore, the maximum value of the width of the blade 4 is the value obtained by dividing the outer peripheral length of the impeller 1 by the number of blades 4. On the other hand, when the blade plate 6 is wound twice, the length of the blade plate 6 in the longitudinal direction is secured for two outer circumferences of the impeller 1. Therefore, the maximum value of the width of the blade 4 is a value obtained by dividing twice the outer peripheral length of the impeller 1 by the number of blades 4, so that the width of the blade 4 can be increased.

In other words, when compared with the same width of the blade 4, the impeller set 11 wound for two turns can set the distance between the blades 4 narrower than the impeller set 10 formed for one turn, and the sirocco. The characteristics as a fan can be improved.

Further, since the blades 4 are cut and raised on the blade plate 6, the blades 4 can be arranged at predetermined intervals.

Further, when the double-wound blade plates 6 are crimped, the respective blade plates 6 are displaced in different directions in the rotation axis direction, so that the inner peripheral ring 5 is in a state of wavy waves in the circumferential direction. In other words, the inner peripheral ring 5 has a portion that is bulged and a portion that is dented in the direction of the rotation axis. Since the blade 4 is held by the inner ring 5 that has been waved in this way, the bonding strength between the inner ring 5 and the blade 4 can be increased.

Further, the caulking margin portion 7 is provided intermittently, and when the blade plate 6 is double-wound, the caulking margin portion 7 of the blade plate 6b on the outer peripheral side is provided between the caulking margin portions 7 of the blade plate 6a on the inner peripheral side. Is placed. That is, when winding the blade plate 6b on the second lap, the caulking margin portion 7 is arranged between the crimping margin portions 7 in the already wound state, so that the blade plate 6b on the second lap can be positioned. It will be easy.

Further, the impeller 1 of the sirocco fan according to the present embodiment can be applied to a range hood that discharges oil smoke generated during cooking. That is, according to the sirocco fan of the present embodiment used for the range hood, the discharged air can adhere the contained oil to the inner peripheral ring 5 by coming into contact with the inner peripheral ring 5. Then, it can be discharged outdoors in a state where the oil content is reduced from the discharged air.

The impeller of the sirocco fan according to the present invention can be widely applied to a blower using the sirocco fan, and is particularly useful as a blower for a range hood that discharges oily smoke generated during cooking.

1 Impeller 2 Fan base 2a Through hole 3 Fan ring 4 Blade 5 Inner circumference ring 6 Blade plate 7 Caulking margin 8 Convex part 8a Slit 9 Concave 10 Impeller set 11 Impeller set 12 Groove 41 Notch 61 Support side 101 Oil trap Collecting part 102 Recessed part 103 Holding part 104 Collecting ring

Claims (5)

A blade plate formed by cutting multiple blades from a strip-shaped metal plate at approximately equal intervals,
It is made of metal and has an annular and plate-shaped inner ring.
A slit cut toward the inner peripheral side is provided on the outer peripheral side of the inner peripheral ring.
The blade plate is provided on the outer peripheral side of the inner peripheral ring so as to have a cylindrical shape.
The blade has a notch on the inner peripheral side and has a notch.
The slit of the inner peripheral ring and the notch of the blade are opposed to each other and fitted to each other.
At least two blade plates are used, and they are radially overlapped on the inner peripheral side and the outer peripheral side to form a cylindrical shape.
The inner peripheral ring alternately fits the blade of the blade plate on the inner peripheral side and the blade of the blade plate on the outer peripheral side.
The notch provided in the blade on the inner peripheral side and the notch provided in the blade on the outer peripheral side are impellers of a sirocco fan provided so as to be offset by a predetermined distance in the direction of the rotation axis . The impeller of the sirocco fan according to claim 1 , wherein the slit provided in the inner peripheral ring has a shape in which the opening width expands toward the outer peripheral end. The impeller of the sirocco fan according to claim 1 or 2 , which includes a plurality of inner peripheral rings. The impeller of the sirocco fan according to any one of claims 1 to 3 , wherein the blade plate is provided with a caulking margin portion that protrudes in the radial direction intermittently when molded into a cylindrical shape. A range hood equipped with an impeller of the sirocco fan according to any one of claims 1 to 4 .

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