JP6541551B2 - Air intake duct - Google Patents

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an air intake duct, and more particularly to an air intake duct capable of averaging the wind speed in each portion of an air intake.

  A generator equipped with a drive source such as an engine or a motor prevents metal noise from leaking out of the machine and prevents the metal box from being exposed to wind and rain when used outdoors. The components are housed in a soundproof box. In such a generator, the cooling fan is disposed in the soundproof box, and the air inlet is formed in the side wall of the soundproof box, and the inside of the soundproof box is made negative pressure by the rotation of the cooling fan. External air (intake air) is introduced (inhaled) into the space to cool the components.

  In this case, by providing an intake duct on the inner surface of the soundproof box and forming a bent flow path, noise that is about to leak from the intake port to the outside of the machine is blocked and rain water and dust are prevented from entering. Here, the results of analysis of the wind speed distribution of the intake air will be described with reference to FIG. FIG. 6 (a) shows the analysis result of the wind speed distribution of the conventional product, and FIG. 6 (b) shows the analysis result of the wind speed distribution at the inlet of the conventional product.

  As shown in FIG. 6, the intake air drawn from the air inlet has a locally high wind speed inside the bent flow path (the edge on the air outlet side of the air inlet). Therefore, raindrops dropped on the outer wall of the soundproof box are easily sucked into the intake duct. In addition, air flow that is locally accelerated by the wind speed forms a wall (air curtain), so that suction of intake air from the air intake (outside the bent flow path) is limited, and the air intake cross-sectional area is effective. Unavailable

  On the other hand, the technique which suppresses suction of a raindrop and formation of an air curtain is disclosed by patent document 1 by equalizing the wind speed in each part of an inlet. Specifically, a partition plate is provided in the intake duct, and the flow path is divided into two parts, thereby suppressing a local increase in wind speed that occurs inside the bent flow path (the end on the air outlet side of the intake port) Do.

JP, 2009-121409, A (For example, paragraph 0025, 0030, FIG. 1, etc.)

  However, even with the above-described prior art, there has been a problem that the wind speed at each part of the intake can not be sufficiently averaged. Therefore, it was not possible to sufficiently suppress the suction of raindrops and the formation of the air curtain.

  The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an air intake duct which can average the wind speed in each portion of the air intake port.

  In order to achieve this object, the air intake duct according to claim 1 is mounted on the inner surface of the side wall of the soundproof box for a generator having an air intake opening formed in the side wall, and is introduced into the internal space from the air intake port. A back plate which forms a flow path of intake air, one side is connected to the inner surface of the side wall and is opposed to the entire surface of the air intake port while the other side extends beyond the air intake port, and Side connection plate connecting the side edge of the back plate to the inner surface of the side wall and forming a flow path with the back plate, the other side of the back plate being opened as an outlet, formed by the side connection plate and the back plate And a plurality of partition plates for dividing the flow path into a plurality of flow paths, and the plurality of partition plates are respectively disposed at positions where the division width is larger as the flow path is closer to the back plate.

  In the air intake duct according to claim 2, in the air intake duct according to claim 1, the partition plate is extended to a position where one side faces the air inlet and the other side does not exceed the air inlet.

  The air intake duct according to claim 3 is formed by bending the back plate and the plurality of partition plates in the air intake duct according to claim 1 or 2, and a bending line of the back plate and the bending line of the back plate The bending lines of the plurality of partition plates are respectively located on one virtual plane.

  According to a fourth aspect of the present invention, in the air intake duct of the first or second aspect, the plurality of partition plates are disposed in a posture substantially parallel to the back plate.

  According to the air intake duct according to claim 1, provided with a plurality of partition plates for dividing the flow passage formed by the side connection plate and the back plate into a plurality of flow passages, the plurality of partition plates are provided on the back plate As the flow paths are closer to each other, they are disposed at positions where the division width becomes larger. Therefore, the wind speed in each of the divided flow paths can be averaged to average the wind speed in each part of the intake port. As a result, it is possible to suppress raindrop suction and air curtain formation.

  According to the air intake duct of the second aspect, in addition to the effect of the air intake duct of the first aspect, the material cost can be reduced by shortening the partition plate. That is, when the other side of the partition plate extends beyond the intake port, the partition plate becomes long and the material cost increases, but the other side of the partition plate does not exceed the intake port, so the material Cost can be reduced.

  Note that arranging the other side of the partition plate at a position not exceeding the intake port is impossible in the prior art in which the flow path is divided into two by the partition plate provided in the intake duct (that is, division In the present invention, since the wind speeds are different in each of the flow paths, the intake air flowing through the flow paths merge and interfere with each other to prevent the flow to the outlet, or an air curtain is formed. By dividing the flow path into a plurality of parts by a plurality of partition plates and increasing the division width as the flow path is closer to the back plate (that is, by averaging the wind speeds of the divided flow paths) It is the first time possible. As a result, unnecessary portions of the partition plate can be omitted, and the material cost can be reduced accordingly.

  According to the intake duct of the third aspect, in addition to the effect of the intake duct of the first aspect or the second aspect, the back plate and the plurality of partition plates are respectively bent and formed, and Since the bending lines and the bending lines of the plurality of partition plates are located on one imaginary plane, the division width of each flow path can be made constant along the flow direction of the intake air. Thereby, the wind speed in each divided | segmented flow path can be averaged, and the wind speed in each part of an inlet can be averaged.

  According to the intake duct of the fourth aspect, in addition to the effect of the intake duct of the first aspect or the second aspect, since the plurality of partition plates are disposed in a posture substantially parallel to the back plate, each flow path Can be made constant along the flow direction of the intake air. Thereby, the wind speed in each divided | segmented flow path can be averaged, and the wind speed in each part of an inlet can be averaged.

It is a partially expanded perspective view of a generator equipped with an intake duct in an embodiment of the present invention. (A) is a partial enlarged front view of a generator in arrow IIa direction view of Drawing 1, and (b) is a partial enlarged sectional view of a generator in a IIb-IIb line of Drawing 2 (a). It is the elements on larger scale sectional view of the generator in the III section of Drawing 2 (b). (A) is the analysis result of the wind speed distribution of the invention, (b) is the analysis result of the wind speed distribution at the inlet of the invention. (A) is an analysis result of the wind speed distribution of the comparative product, and (b) is an analysis result of the wind speed distribution at the inlet of the comparative product. (A) is an analysis result of the wind speed distribution of the conventional product, and (b) is an analysis result of the wind speed distribution at the air inlet of the conventional product.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a partially enlarged perspective view of a generator 1 equipped with an air intake duct 20 according to an embodiment of the present invention. 2 (a) is a partially enlarged front view of the generator 1 as viewed in the direction of arrow IIa in FIG. 1, and FIG. 2 (b) is a diagram of the generator 1 taken along line IIb-IIb in FIG. 2 (a). It is a partial expanded sectional view.

  In FIGS. 1 and 2, the sizes of the air inlet 11a and the air intake duct 20 relative to the soundproof box 10 are relatively enlarged and schematically illustrated in order to simplify the drawings and facilitate understanding. .

  As shown in FIG. 1 and FIG. 2, the generator 1 is mounted on a box-shaped soundproof box 10 for accommodating components (not shown) such as an engine and a cooling fan and the inner surface of the side wall 11 of the soundproof box 10. And an intake duct 20. In the soundproof box 10, an intake port 11a having a rectangular shape in a front view is formed in the side wall 11, and a flow path of outside air (intake air) introduced into the intake port 11a and the internal space of the soundproof box 10 is formed by the intake duct 20. Ru. In the present embodiment, the generator 1 is formed as a portable generator.

  The intake duct 20 divides the flow passage formed by the back plate 21, the pair of side connection plates 22 forming the flow passage together with the back plate 21, and the back plate 21 and the side connection plate 22 into a plurality of flow passages A first partition plate 23 and a second partition plate 24 (in this embodiment, divided into three) are provided.

  The rear plate 21 has one side 21a connected to the inner surface of the side wall 11 of the soundproof box 10 and is opposed to the entire surface of the intake port 11a while the other side 21b is the inner edge of the intake port 11a (the side opposite to the side to which the one side 21a is connected Extending to the ceiling wall 12 of the soundproof box 10 beyond the inner edge of In the present embodiment, the distance between the other side 21 b of the back plate 21 and the ceiling wall 12 of the soundproof box 10 is set to the distance W1.

  The back plate 21 is formed by bending a rectangular plate in a front view vertically long rectangular shape in a side view, and a flat plate portion on the other side 21 b side is extended in parallel with the side wall 11 of the soundproof box 10. In the present embodiment, the distance between the back plate 21 (the flat plate portion on the other side 21 b side) and the side wall 11 of the soundproof box 10 is set to the distance W2, and the flat plate portion on the side 21 a And the inner edge of the intake port 11a (the inner edge on the opposite side to the side to which the side 21a of the back plate 21 is connected) is set as the distance W3. The distance W1 and the distance W3 are set to be equal to or longer than the distance W2 (W2 ≦ W1 and W2 ≦ W3). Further, an angle θ1 between the flat plate-like portion on one side 21a side of the back plate 21 and the side wall 11 of the soundproof box 10 is set to θ1 = 60 °.

  The side connection plate 22 connects the edges on both sides of the back plate 21 (the side connecting the one side 21 a and the other side 21 b) to the inner surface of the side wall 11 in the soundproof box 10. Thus, a flow path in which the other side 21 b side of the back plate 21 is opened as a blowout port between the back plate 21 and the side connection plate 22 and the side wall 11 of the soundproof box 10 (that is, the intake introduced from the intake port 11a A flow path for flowing air to the outlet is formed. In addition, the opposing space | interval (FIG. 2 (a) horizontal direction space | interval) of a pair of side connection board 22 is set similarly to the width dimension of the inlet port 11a.

  As described above, the first partition plate 23 and the second partition plate 24 are disposed in the flow path formed by the back plate 21 and the side connection plate 22. The first partition plate 23 and the second partition plate are provided. The flow path is divided into three in the thickness direction (the left and right direction in FIG. 2B) by 24. Here, the detailed configuration of the first partition plate 23 and the second partition plate 24 will be described with reference to FIG.

  FIG. 3 is a partial enlarged cross-sectional view of the generator 1 in the portion III of FIG. 2 (b). In addition, in FIG. 3, the plate | board thickness dimension of each member which comprises the inlet duct 20 is enlarged rather than actual, and is shown in figure typically.

  As shown in FIG. 3, the first partition plate 23 and the second partition plate 24 are disposed in a posture substantially parallel to the back plate 21 and have edge portions (sides) on both sides in the width direction (vertical direction in FIG. 3). Are connected to the side connection plate 22. Specifically, the first partition plate 23 and the second partition plate 24 are formed by bending a rectangular plate in a front view vertically long rectangular shape in a side view, and a flat plate portion on one side 23 a, 24 a side is a back plate 21. The flat portion on one side 21a side and the flat portion on the other side 23b, 24b side extend parallel to the flat portion on the other side 21b side of the back plate 21, respectively.

  In the present embodiment, the distance between the side wall 11 (virtual surface including the inner surface of the side wall 11) of the soundproof box 10 and the first partition plate 23 (flat plate portion on the other side 23b side) is the first partition at a distance W4. The distance between the plate 23 and the second partition plate 24 is set to the distance W5, and the distance between the second partition plate 24 and the back plate 21 is set to the distance W6. The intervals W4, W5, and W6 correspond to the division width of the flow path according to claim 1.

  In this case, the interval W5 is set to be larger than the interval W4, and the interval W6 is set to be larger than the interval W5 (W4 <W5 <W6). Accordingly, the flow path divided into three by the first partition plate 23 and the second partition plate 24 has a larger division width as the flow path on the side closer to the back plate 21 (that is, the bending outer side). Thereby, the wind speed in each flow path divided into 3 can be averaged, and the wind speed in each part of air intake 11a can be averaged. As a result, it is possible to suppress raindrop suction and air curtain formation.

  Here, the intervals W4, W5 and W6 are set to satisfy the relational expression of W4: W5: W6 = 1: N: N × N (1 <N). In the present embodiment, N = 1.15. However, such a relational expression is an example of one embodiment, and it is of course possible to adopt other relational expressions.

  The first partition plate 23 and the second partition plate 24 have the sides 23a and 24a facing the intake port 11a, and the other sides 23b and 24b have the inner edge of the intake port 11a (opposite to the side to which the side 21a of the back plate 21 is connected It is extended to a position where it does not exceed the inner edge of the side).

  In the present embodiment, the distance between the other sides 23b and 24b and the inner edge of the intake port 11a (the inner edge opposite to the side to which the one side 21a of the back plate 21 is connected) is set to the distance W7. Therefore, when the intake port 11a is viewed from the front, the other sides 23b and 24b are positioned lower than the inner edge of the intake port 11a (on one side 21a side of the back plate 21, lower side in FIG. 2A). A gap (gap) of W7 is formed. However, the interval W7 may not be provided (that is, the distance may be zero), and the inner edge of the intake port 11a and the other sides 23b and 24b may be disposed at the same position (a coincident position in front view).

  As described above, in the present embodiment, the other sides 23b and 24b of the first partition plate 23 and the second partition plate 24 are the inner edge of the intake port 11a (the inner edge of the back plate 21 opposite to the side connected to the side 21a) The length of the first partition plate 23 and the second partition plate 24 can be shortened to reduce the material cost accordingly.

  In the prior art in which the flow path is divided into two by the partition plate provided in the intake duct, it is impossible to arrange the other side of the partition plate at a position not exceeding the intake port (that is, division In the present invention, since the wind speeds are different in each of the flow paths, the intake air flowing through the flow paths merge and interfere with each other to prevent the flow to the outlet, or an air curtain is formed. The flow path is divided into three by the first partition plate 23 and the second partition plate 24, and the division width is increased as the flow path is closer to the back plate 21 (that is, the wind speed of each divided flow path is averaged) It is the first time it has been possible). As a result, unnecessary portions of the first partition plate 23 and the second partition plate 24 (portions extended beyond the intake port 11a) can be omitted, and the material cost can be reduced accordingly.

  The sides 23 a and 24 a of the first partition plate 23 and the second partition plate 24 are disposed at a distance from the side wall 11 (a virtual surface including the inner surface of the side wall 11) of the soundproof box 10. Thereby, interference with a net-like body (for example, one formed by punching and having a plurality of small holes) disposed in the intake port 11a can be avoided. However, one side 23a and 24a may be located in the inlet 11a.

  As described above, the back plate 21, the first partition plate 23, and the second partition plate 24 are each formed to be bent in a V shape in a side view. In this case, in the present embodiment, a bending line of the back plate 21 (a ridge line where a flat portion on one side 21a and a flat portion on the other side 21b intersect) and a bending line of the first partition plate 23 (on one side 23a side) Of the flat plate-like portion and the flat plate-like portion on the other side 23 b side) and a bending line of the second partition plate 24 (ridge line where the flat plate-like portion on one side 24 a side and the flat plate-like portion on the other side 24 b intersect) Are respectively located on the virtual plane S1.

  Thereby, the division width of each flow path divided into three by the first partition plate 23 and the second partition plate 24 is along the flow direction of the intake air (the extending direction of the first partition plate 23 and the second partition plate 24) Can be constant. Thereby, the wind speed in each divided | segmented flow path can be averaged, and the wind speed in each part of the inlet 11a can be averaged.

  Next, the results of analysis of the wind speed distribution of the intake air will be described with reference to FIGS. 4 and 5.

  Fig.4 (a) is an analysis result of the wind speed distribution of an invention, and FIG.4 (b) is an analysis result of the wind speed distribution in the inlet 11a of an invention. Moreover, Fig.5 (a) is an analysis result of the partial velocity distribution of a comparative product, FIG.5 (b) is an analysis result of the wind speed distribution in the inlet port of a comparative product.

  4 (a) and 5 (a) correspond to the cross section (central longitudinal cross section) along line IIb-IIb in FIG. 2 (a), and FIGS. 4 (b) and 5 (b) are , Corresponding to a partial enlarged view of FIG.

  The analysis of the wind speed distribution was performed on the invention (see FIG. 4) and the comparison (see FIG. 5). The inventive product is the generator 1 (that is, the one in which the intake duct 20 is mounted on the soundproof box 10) in the present embodiment. The comparative product is the same as the inventive product except for the difference in the configuration of the partition plate.

Here, in the comparative product, the flow path is divided into two by one partition plate, and the distance (interval) between the partition plate and the back plate 21 is the inner edge of the intake port 11a (one side 21a of the back plate 21 It is half the distance W3 which is the distance between the connected side and the opposite inner edge). Therefore, in the comparative product, the flow path is divided into two at equal intervals.

  Further, the partition plate of the comparative product is extended beyond the inner edge of the intake port 11a (the inner edge of the back plate 21 opposite to the side where the side 21a is connected) of the other side. The length of the extension is half of the length of the other side 21 b of the back plate 21 extending beyond the inner edge of the intake port 11 a.

  In addition, FIG. 6 is the result of analyzing the wind speed distribution with respect to what is considered to be the same as the inventive product (conventional product) except for the point that the partition plate is not provided (omitted). Here, the description of the analysis result of the conventional product is omitted.

  As shown in FIGS. 4 and 5, the inner edge of the intake port 11a (the inner edge of the back plate 21 opposite to the side to which the side 21a is connected, the upper edge of FIGS. 4 (b) and 5 (b)) Compared to the distribution of the wind speed in the region along the above, in the comparison product, the wind speed exceeding 11.6 m / s is distributed along the inner edge, while in the invention, the wind speed up to 10.7 m / s and It was possible to suppress the formation of a region where the wind speed was locally increased.

  Further, in the comparative product, a region where the wind velocity is lowered (a region where the wind velocity is 4.5 m / s or less) is largely distributed in the upper half of the intake port 11a (upper side in FIG. 5B). The area of the wind speed (4.5 m / s or less) could be reduced to about half.

  As described above, in the invention, the flow velocity is divided at unequal intervals such that the division width becomes larger as the flow passage closer to the back plate 21 increases, so that the wind speed in each flow passage is compared with the comparison product. It has been confirmed that the wind speed at each part of the intake port 11a can be averaged. As a result, suction of raindrops can be suppressed. Further, the intake of the intake air from the intake port 11a can be smoothed, that is, the cross-sectional area of the intake port 11a can be effectively used, and the air volume can be increased.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited at all to the said embodiment, It is easy to be able to perform various improvement change in the range which does not deviate from the meaning of this invention. It can be guessed.

  The relationship of the distances (intervals) between the configurations described in the above embodiment is an example, and it is naturally possible to adopt other relationships.

  In the above embodiment, the case where the flow path is divided into three by the two partition plates (the first partition plate 23 and the second partition plate 24) has been described, but the present invention is not necessarily limited thereto. The flow path may be divided into four or more divisions by three or more partition plates as long as the division width is increased as the flow path.

10 Soundproof box (soundproof box for generator)
11 side wall 11a air intake 20 air intake duct 21 back plate 22 side connection plate 23 first partition plate (partition plate)
24 Second partition (partition)
21a, 23a, 24a side 21b, 23b, 24b other side W4, W5, W6 interval (division width)
S1 virtual plane

Claims (4)

An intake duct mounted on an inner surface of the side wall of the soundproof box for a generator having an intake port formed in the side wall and forming a flow path of intake air introduced from the intake port into the internal space,
A back plate having one side connected to the inner surface of the side wall and opposed to the entire surface of the air inlet, and the other side extending beyond the air inlet;
A side connecting plate which connects the side edge of the back plate to the inner surface of the side wall and forms, together with the back plate, a flow path whose other side of the back plate is opened as an outlet;
And a plurality of partition plates for dividing a flow path formed by the side connection plate and the back plate into a plurality of flow paths,
An intake duct characterized in that the plurality of partition plates are disposed at positions where the division width becomes larger as the flow path is closer to the back plate.   2. The air intake duct according to claim 1, wherein one side of the partition plate faces the air inlet, and the other side extends to a position not exceeding the air inlet.   The back plate and the plurality of partition plates are respectively bent and formed, and the bending line of the back plate and the bending line of the plurality of partition plates are respectively positioned on one virtual plane. The air intake duct according to claim 1 or 2, characterized in.   The air intake duct according to claim 1 or 2, wherein the plurality of partition plates are disposed in a posture substantially parallel to the back plate.