JP2012107627A - Bell mouth for blowers and range hood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bell mouth for a blower improved so as to further reduce noise level along with flowing in resistance generated in a casing sucking opening without reducing gas discharge ability of a fan and a range hood with the blower.SOLUTION: The bell mouth includes an annular swelled out part 13 bent downward in the circumference part of the bell mouth 12 facing the casing sucking opening 11 opening downward of the blower 1. The downward facing swelled shape or the swelled part 13 is formed in a taper shape being inclined toward an inclination lowermost part 20 such that an circumferential part P1 side crossing a line L passing through an axial core P in a plan view on the circumference of the bell mouth 12 is the inclination lowermost part 20, thereby the noise level dB (A) along with the flowing in resistance of waste gas is effectively reduced.

Description

  The bell mouth for the blower and the range hood, more specifically, the bell mouth for the blower which is installed above the kitchen cooker and used for sucking and collecting the waste gas generated by cooking and exhausting it outdoors, and the bell The present invention relates to a range hood in which a blower including a mouse is accommodated.

In recent years, kitchens and other cabinets have a tendency to emphasize interior design in order to integrate with the living room. Design has been required for harmony.
Therefore, in the recent range hood, the hood part for collecting waste gas generated by cooking has been changed from the deep type (boot type) to the thin type, and this thin type range hood is It is becoming mainstream.

In addition, with recent high airtightness of houses, range hoods using a centrifugal fan as an exhaust fan of a blower have become mainstream.
However, when a centrifugal fan is used, the exhaust (suction) performance of the fan, such as increasing the collection rate of waste gas, is improved, but the waste generated in the casing suction port that opens downward in the fan casing in which the centrifugal fan is built. The gas inflow resistance increases, which causes noise generation.

  Therefore, as a measure to reduce the inflow resistance of air generated at the casing suction port, the fan that is installed in a continuous manner on the top plate with respect to the hood part for collecting waste gas generated by cooking There has been proposed a range hood provided with a bell mouth at a casing suction port that opens to the top (for example, see Patent Document 1). An example is shown in FIG.

JP 2006-112717 A (see paragraph number 0013 and FIG. 1)

By the way, in the conventional range hood A1, the bell mouth 33 attached to the casing suction port 32 of the blower 31 arranged in a continuous manner on the hood portion 30 is, as is apparent from FIG. The casing suction port 32 is formed so as to be mounted parallel (horizontally) to the periphery of the opening circle with respect to the downward opening of the casing suction port 32.
That is, as shown in FIGS. 7A and 7B, the conventional bell mouth 33 is a trumpet in which the inner circumferential edge opposite to the circumference of the exhaust fan 31a is raised and curved toward the exhaust fan 31a. A mouth 33a is provided.
And the flange part 34 for attaching the bell mouth 33 to the casing suction inlet 32 by screwing is formed in the cross-sectional shape extended horizontally outwardly from the curved lower end circular periphery of the trumpet mouth 33a. .

  Therefore, in the conventional bell mouth, the effect of reducing the inflow resistance of the waste gas (air) generated in the casing suction port due to the curved shape of the trumpet mouth can be obtained, but the effect is small, and the user can The current situation is that the noise level dB (A) is not lowered to an unnoticeable level.

  Therefore, the present invention has been developed to solve the above-described problems, and can further reduce the noise value associated with the inflow resistance generated at the casing suction port without reducing the exhaust capacity of the fan. An object is to provide an improved bell mouth for a blower and a range hood provided with the blower.

In order to solve the above-mentioned problems, the present invention is a bell mouth provided in a casing suction port that opens to a blower, and is formed in an annular shape that is curved downward at a circumferential portion of a bell mouth body that faces the casing suction port. A bell mouth for a blower comprising a bulging portion, wherein the downward bulging shape of the bulging portion is formed such that a part of the annular shape becomes a bank part having a larger bulging distance than the other part. Alternatively, the present invention is a bell mouth provided in a casing suction port that opens to a blower, and an annular bulge that is curved downward at a circumferential portion of the bell mouth body that faces the casing suction port. A lower end opening surface of the bulging portion on the circumference of the bell mouth body, the one circumferential portion side intersecting with a straight line passing through the axis in plan view is inclined at the lowermost portion. Most In the blower for bellmouth, it characterized in that it is formed into a shape tilted toward the section.
Here, for example, when the blower is built in the range hood and the bell mouth body is attached to the casing suction opening that opens to the blower, the lowermost inclined portion of the bulging portion is located on the rear side of the range hood. It is preferable to attach as described above.
Then, a drainage port is formed in the lowermost part of the bulging portion to temporarily accumulate in the fan casing of the blower, and to flow down oil and fat and water dripping on the bell mouth body from the casing suction port. It is preferable to do this.

Further, the present invention includes a hood portion for collecting waste gas generated by cooking, and a blower having a bell mouth at a casing suction port for sucking and exhausting the collected waste gas. A range hood comprising an annular bulging portion curved downward on a circumferential portion of the bell mouth body facing the casing suction port, and the downward bulging shape of the bulging portion is In the range hood, a part of the ring is formed to be a bank part having a larger bulge distance than the other part, or the present invention captures waste gas generated by cooking. A range hood comprising a hood portion for collecting and a blower having a bell mouth at a casing suction port for sucking and exhausting collected waste gas and the like, wherein the casing suction An annular bulging portion curved downward is provided in a circumferential portion of the bell mouth body facing the mouth, and a lower end opening surface of the bulging portion is an axial center in plan view on the circumference of the bell mouth body. The range hood is formed in a shape inclined toward the lowermost portion of the slope so that the one circumferential portion side intersecting with the straight line passing through the lowermost portion becomes the lowermost portion of the slope.
Then, a drainage port is formed in the lowermost part of the bulging portion to temporarily accumulate in the fan casing of the blower and to flow down oil and fat or moisture dripping on the bell mouth from the casing suction port. It is preferable to do this.

The present invention is provided with an annular bulging portion curved downward in a circumferential portion of a bell mouth body provided in a casing suction opening that opens to a blower. Further, the downward bulging shape of the bulging portion is an annular shape. Is formed such that a part of the bank is a bank having a larger bulging distance than the other part, or the lower end opening surface of the bulging part is an axial center in a plan view on the circumference of the bell mouth body. It is formed in the shape inclined toward the said lowest slope part so that the one circumferential part side which crosses the straight line which passes through may become the lowest slope part.
In other words, by providing a bank part that is the lowermost part of the slope that has a bulging amount larger than the downward bulging amount of the bulging part on the other circumference, on the part of the circumferential part of the bell mouth, Acts as a noise suppression unit for lowering the noise level associated with the inflow resistance of waste gas. Thereby, the noise value accompanying the inflow resistance generated at the casing suction port (bell mouth) can be reduced without reducing the exhaust capacity of the fan.

In addition, the circumferential portion of the bell mouth body provided in the casing suction port of the fan of the range hood is provided with a bulging portion curved downward, and a drainage port at the bottom of the downward bulging portion It has.
As a result, oil and fat or water dripped from the casing suction port to the inside of the bulging portion flows down to the lowermost portion along the inclination of the bulging portion, and, for example, the bell mouth of the bell mouth It can be dropped onto a grease filter or the like provided below. That is, oil and fat, water, and the like dripped from the casing suction port to the bulging portion do not accumulate inside the bulging portion.

It is a vertical side view which shows the range hood provided with the bell mouth which concerns on this embodiment in the casing suction inlet of an air blower. It is the longitudinal cross-sectional side view which expands and shows the principal part. It is a perspective view showing the bell mouth concerning this embodiment. It is the same top view of the bell mouth concerning this embodiment. It is the VV line longitudinal cross-sectional view of FIG. It is the VI-VI line longitudinal cross-sectional view of FIG. A prior art example is shown, (a) is a vertical side view showing a range hood provided with a conventional bell mouth in a casing suction port of a blower, and (b) is a perspective view showing the bell mouth.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
FIG. 1 is a vertical side view showing a range hood provided with a bell mouth according to the present embodiment in a blower, and FIG. 2 is an enlarged vertical side view showing a main part.

≪Configuration of range hood≫
The range hood A is installed on a wall surface B or the like at a designated height position that is almost directly above a cooking device (not shown) such as a gas range, and waste gas G such as oil smoke, water vapor, and hot air generated by cooking. The air is exhausted to the outside through the exhaust duct 3.
As shown in FIG. 1, the range hood A has a horizontally installed blower 1 disposed on a top plate 2 a of a flat box-shaped hood portion 2 that opens downward. And the front board 4 of the height from the top plate 2a of the food | hood part 2 to the ceiling C is provided so that the air blower 1, the exhaust duct 3, etc. of the upper space of the food | hood part 2 may be hidden.

As shown in FIG. 1, the hood portion 2 is provided with a rectifying plate 6 along a downward opening edge so as to secure a waste gas intake space 5 between the opening edge and the opening edge. As a result, the waste gas G rising from the cooker is sucked into the hood portion 2 from the waste gas intake space 5 along the rectifying plate 6 by the exhaust capability of the exhaust fan 1a described later of the blower 1.
The current plate 6 has a rectangular shape in plan view that is slightly smaller than the downward opening of the hood portion 2, and includes a rising edge 6 a around the rectangular shape.

Further, as shown in FIG. 1, a grease filter 7 is provided above the rectifying plate 6 in the hood portion 2 in parallel with an appropriate interval from the rectifying plate 6. The grease filter 7 is detachably supported by a hood cover 8 incorporated so as to partition the inside of the hood portion 2 into a downward opening side and a top plate 2a side.
As a result, when the waste gas G passes through the grease filter 7, the fats and oils contained in the waste gas G are separated and captured. Oils and fats, moisture M, and the like captured by the grease filter 7 are once dropped on the current plate 6 and collected in an oil pack (collection container) 9 detachably provided below the current plate 6. I am doing so.

≪Blower configuration≫
As shown in FIGS. 1 and 2, the blower 1 has a fan motor 1 c attached substantially vertically upright to a fan casing 1 b attached horizontally on the top plate 2 a of the hood portion 2. An exhaust fan 1a is detachably attached to a motor shaft of a fan motor 1c that faces the motor casing 1b substantially coaxially with the motor body.
Incidentally, the exhaust fan 1a is a centrifugal fan (commonly referred to as a sirocco fan) having a high exhaust capability.

  A bell mouth 12 is provided in a casing suction port 11 opened downward in the fan casing 1b so as to communicate with a communication port 10 opened in the top plate 2a of the hood section 2. Thus, the waste gas G passing through the grease filter 7 is introduced from the bell mouth 12 into the fan casing 1b and exhausted to the outside through the exhaust duct 3.

≪Configuration of Bellmouth≫
FIG. 3 is a perspective view showing a bell mouth according to the present embodiment, and FIG. 4 is a plan view thereof. 5 and 6 are longitudinal sectional views of FIG. Here, description will be made with reference to FIGS. 1 and 2 as appropriate.
The bell mouth 12 is formed integrally with the press work and the drawing bending process, and as shown in FIGS. 2 and 3, the bell mouth 12 is formed in a disk shape that is slightly larger than the opening diameter of the casing suction port 11. In addition, a bulging portion 12 that is curved downward is provided in an annular shape at a circumferential portion facing the casing suction port 10.

  Then, as shown in FIG. 3 and FIG. 4, the bell mouth 12 is raised and curved so that the inner wall 13a of the bulging portion 13 whose section is curved downwardly concave is directed upward. A trumpet port 12a is provided, and when the bell mouth 12 is attached to the casing suction port 11, the upper end opening edge side of the trumpet port 12a faces the inside of the exhaust fan 1a so as not to contact the inner peripheral surface of the exhaust fan 1a. It is made to exist (refer FIG.1 and FIG.2).

  Moreover, the bell mouth 12 is provided with the annular flange part 14 along the upper-end outer periphery of the outer side wall part 13b of the bulging part 13 curved to a downward concave shape, as shown in FIG.3 and FIG.4. The flange portion 13 is provided with a screw hole 15 at one location on the circumference and screw engagement portions 16 and 17 at two locations. When the bell mouth 12 is attached to the casing suction port 11, Screws are fixed by three-point support using 18 and 19.

As shown in FIG. 4, the screw hole 15 and the screw locking portions 16 and 17 are arranged so that the circumference 3 of the flange portion 14 has an angle range of 120 ° with the axis P of the bell mouth 12 as a fulcrum in plan view. It is formed in each place.
That is, as shown in FIGS. 3 and 4, the screw hole 15 dents the outer wall portion 13 b of the bulging portion 13 inward so that the downward bulging width of the bulging portion 13 is partially reduced. It is formed in the flange part 14 ensured by this.

  On the other hand, the screw locking portions 16 and 17 are formed by denting the outer wall portion 13b of the bulging portion 13 inward so as to narrow the downward bulging width of the bulging portion 13 within an angle range of 120 °. The flange width of the flange portion 14 in the angle range of 120 ° is made wider than the flange width of the flange portion 14 in the remaining 240 ° angle range. Then, the outer peripheral edge portion of the flange portion 14 within the angle range of 120 ° is cut out so as to be slightly smaller than the outer diameter of the flange portion 14 in the remaining 240 ° angle range. It is formed in a substantially acute outward shape on both sides of the circular arc of the peripheral portion 14a.

As described above, the mounting structure of the bell mouth 12 to the casing suction port 11 (fan casing 1b) is supported at three points by one screw hole 15 and two screw locking portions 16, 17. During the cleaning operation of the range hood A, such as removing the exhaust fan 1a and washing, and washing the inside of the fan casing 1b, the bell mouth 13 can be removed and attached, etc. very easily and easily. The handleability is improved.
That is, the bell mouth 13 can be easily removed from the casing suction port 11 by removing one set screw 18 and loosening it without removing the two set screws 19.

≪Configuration of bulge part≫
As shown in FIGS. 3 and 4, the bulging portion 13 has a downward concave shape such as a substantially semicircular shape or a substantially U-shaped cross section at a circumferential portion of the bell mouth 12 so as to have a predetermined bulging width. It is formed so as to surround the trumpet mouth 12a.

In addition, as shown in FIG. 4, the bulging portion 13 has an inclined lowermost portion 20 on one circumferential portion P1 side that intersects with a straight line (diameter) L passing through the axis P of the bell mouth 12 in a plan view. The taper is formed so as to be gradually inclined from the other circumferential portion P2 side toward the inclined lowermost portion 20 (see FIG. 5).
In addition, the inclination angle θ of the bulging portion 12 that inclines from the circumferential portion P2 toward the circumferential portion P1 in the circumference of the bell mouth 12 is preferably set to an angle range of 1 to 8 °. .

In this way, the bulging portion 13 having the downwardly inclined structure inclined in one direction toward the lowermost inclined portion 20 on the circumferential portion P1 side in the circumference of the bell mouth 12 has the grease filter 7 as shown in FIG. The waste gas G that passes through and is sucked into the hood portion 2 acts as a noise suppression portion for reducing the noise value associated with the inflow resistance when the exhaust fan 1a flows into the fan casing 1b from the bell mouth 12 by the exhaust fan 1a. To do.
In particular, the sloped lowermost portion 20 whose bulge amount is larger than the downward bulge amount of the bulge portion 13 on the other circumferences becomes a bank portion for relaxing the inflow resistance of the waste gas G, and this bank portion is the waste gas. It acts as a noise suppression unit for suppressing the inflow resistance of G and lowering the noise value. Thereby, the noise value dB (A) accompanying the inflow resistance generated at the casing suction port 11 (bell mouth 12) of the blower 1 can be reduced.

Example 1
Next, the bell mouth 12 provided with the bulging portion 13 having the downward inclined structure is inserted into the casing suction port 10 of the blower 1 arranged in a continuous manner on the hood portion 2 of the range hood A having the hood configuration shown in FIG. On the other hand, as shown in FIG. 1, it is attached so that the inclined lowermost portion 20 of the bulging portion 13 is located on the rear side (the wall surface B side) of the range hood A, and the noise value dB accompanying the inflow resistance of the waste gas G In order to examine the reduction effect of (A), a noise test was performed based on the test conditions shown below. The results are shown in Tables 1 and 2.
Test conditions a. Voltage: 100V 50Hz / 60Hz
b. Exhaust fan feather shape: Centrifugal fan (sirocco fan)
c. Exhaust: Ceiling direction d. Temperature (room temperature): 15.0 ° C
e. Atmospheric pressure (room pressure): 1010.6 hPa (758.0 mmHg)
f. Inclination angle of bulge part: 2 °
This test is based on JISC9603 ventilation fan. In the items in Table 2, the front side is the circumferential portion P2 side shown in FIG. 4, the right side is the lower side of the drawing on the VI-VI line of the cross-section indicating line passing through the axis P shown in FIG. It is the upper side of the paper.

Comparative Example 1
Further, as Comparative Example 1, the conventional bell mouth shown in FIG. 7B is attached to the casing suction port 11 of the blower 1 of the range hood A having the hood configuration shown in FIG. The test was conducted according to conditions.

As is clear from Table 1, Example 1 and Comparative Example 1 show substantially the same numerical values for static pressure (Pa), air volume (m ³ / h), and the like. That is, it can be seen that Example 1 and Comparative Example 1 are substantially the same with no difference in fan exhaust capability.
On the other hand, looking at Table 2 showing the noise level, it can be seen that the average value at Hi (50 Hz) is lower by 1.4 dB (A) in Example 1 than in Comparative Example 1. . In addition, it can be seen that the average value at Lo (50 Hz) is 0.3 dB (A) lower in Example 1 than in Comparative Example 1.

Therefore, as is clear from the result of the noise test, the bell mouth 12 provided with the downward inclined bulging portion 13 of Example 1 has a lower noise value than the bell mouth 33 of Comparative Example 1. . This is because, when the waste gas G is taken into the fan casing of the blower from the bell mouth, wind noise generated in the bell mouth is generated in the downward bulging portion 13 of the bell mouth 12, particularly in the lowermost inclined portion 20 thereof. This is because it is effectively reduced.
Thus, according to the bell mouth for a blower and the range hood provided with the blower according to the present embodiment, the noise value dB due to the inflow resistance generated at the casing suction port (bell mouth) without reducing the exhaust capability of the fan. (A) can be effectively reduced.

Moreover, in this embodiment, as shown in FIG.3 and FIG.4, the drainage port 21 is opened to the inclination lowest part 20 of the bulging part 13 of the bellmouth 12. FIG.
That is, by providing the bell mouth 12 with the downward bulging portion 13, the annular groove 22 having an upward opening in a substantially semicircular or substantially U-shaped cross section formed inside the bulging portion 13 is formed in FIG. As shown in FIG. 2 and as a receptacle when oil and fat, moisture M, etc. deposited and deposited on the inner peripheral surface of the fan casing 1b of the blower 1 dripped (flows down) through the casing suction port 11 Play a role.
As a result, as shown in FIGS. 1 and 2, oil and fat, water M and the like dripped into the annular groove 22 flow down the annular groove 22 inclined toward the drainage port 21, and the drainage pipe 21 discharges the drainage pipe. The oil drops are dropped onto the grease filter 7 through 23, and are collected in the oil pack 9 from the rectifying plate 6 disposed on the lower side of the grease filter 7.

Note that the specific configuration of the embodiment of the present invention is not limited to the above-described embodiment, and there are design changes and the like within a scope not departing from the gist of the present invention described in claims 1 to 4. Are also included in the present invention.
For example, as an inclined form directed toward the lowest inclined portion 20 of the bulging portion 12, a range from the circumferential portion P 2 to the axis P of the bell mouth 12, that is, from the circumferential portion P 2 shown in FIG. In the range from the VI line to the VI line, the inclination angle is moderate, and in the range from the VI-VI line to the lowermost inclination 20 on the circumferential part P1 side, the inclination angle is increased. It can be formed in a tapered shape such as changing the inclination angle toward the peripheral portion P1.

  Moreover, as another inclination form toward the inclination lowest part 20 of the bulging part 12, it is set as the horizontal bulging shape which does not have inclination in the range from the circumference part P2 to the VI-VI line of a cross-section instruction line, It can be formed into a tapered shape that is inclined from the VI-VI line toward the lowermost inclined portion 20 on the circumferential portion P1 side.

A Range Hood 1 Blower 1a Exhaust Fan 1b Fan Casing 1c Fan Motor 2 Hood Part 3 Exhaust Duct 11 Casing Suction Port 12 Bellmouth 13 Swelling Part 20 Inclined Lower Part 21 Drainage Port

Claims (6)

A bell mouth provided in a casing suction opening that opens to the blower,
The circumferential portion of the bell mouth body facing the casing suction port is provided with an annular bulging portion curved downward.
The bell mouth for a blower according to claim 1, wherein the downward bulging shape of the bulging portion is formed such that a part of the annular shape becomes a bank portion having a larger bulging distance than the other portion. A bell mouth provided in a casing suction opening that opens to the blower,
The circumferential portion of the bell mouth body facing the casing suction port is provided with an annular bulging portion curved downward.
The lower end opening surface of the bulging portion is directed toward the lowermost inclined portion so that the one circumferential portion side intersecting with a straight line passing through the axis in plan view is the lowermost inclined portion on the circumference of the bell mouth main body. A bell mouth for a blower characterized by being formed into a slanted shape.   The blower bell mouth according to claim 1, wherein a drainage port is opened at a lowermost portion of the bulging portion. A hood for collecting waste gas generated by cooking,
A range hood comprising a blower equipped with a bell mouth at a casing suction port for sucking and exhausting collected waste gas, etc.,
The circumferential portion of the bell mouth body facing the casing suction port is provided with an annular bulging portion curved downward.
The range hood is characterized in that the downward bulging shape of the bulging part is formed such that a part of the annular shape becomes a bank part having a larger bulging distance than the other part. A hood for collecting waste gas generated by cooking,
A range hood configured to include a blower provided with a bell mouth at a casing suction port for sucking and exhausting collected waste gas and the like,
The circumferential portion of the bell mouth body facing the casing suction port is provided with an annular bulging portion curved downward.
The lower end opening surface of the bulging portion is directed toward the lowermost inclined portion so that the one circumferential portion side intersecting with a straight line passing through the axis in plan view is the lowermost inclined portion on the circumference of the bell mouth main body. A range hood that is formed in a slanted shape.   The range hood according to claim 4 or 5, wherein a drainage port is opened at a lowermost portion of the bulging portion.

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