JP6625884B2 - Air intake duct for soundproof box - Google Patents

Description

  The present invention relates to an air intake duct of a soundproof box, and more specifically, a drive source such as an engine or a motor, and various working machines such as a compressor and a generator driven by the drive source are housed in the soundproof box. The present invention relates to an intake duct for taking in air such as cooling air into the soundproof box in the soundproof box of the soundproof type working machine which prevents leakage of noise to the outside.

  In the case of various working machines consisting of drive sources such as engines and motors, and compressors and generators driven by these drive sources, the operating noise is prevented from leaking out of the machine. In order to prevent the components from being directly exposed to wind and rain when used outdoors, the components are housed in a soundproof box, such as a steel plate box, having a sound absorbing material or the like adhered to the inner wall. It is configured as a "type work machine."

  In such a soundproof type working machine, a cooling fan is arranged in the soundproof box to cool the equipment housed therein, for example, the engine, and outside air is introduced into the soundproof box on the wall surface of the soundproof box. When the cooling fan is rotated in the soundproof box, outside air is introduced into the soundproof box through the above-described suction port.

  In this way, the intake port (intake duct) for introducing outside air into the soundproof box may be, for example, a structure in which a simple opening is formed in the side wall. The generated noise leaks directly to the outside of the machine through the air inlet, and dust and rainwater enter through the air inlet to cause a failure of the equipment housed in the soundproof box.

  Therefore, as shown in FIG. 7, a guide body 120 facing the intake port 110 at a predetermined interval in the soundproof box and having a lower side 120 b facing the lower side 110 b of the intake port 110, By mounting an intake guide 140 having side walls 123 and 124 protruding from both ends in the width direction toward the side wall 105 on the inner surface of the side wall 105 of the soundproof box, an intake passage 126 formed in the intake guide 140 is formed. There has been proposed an intake duct 100 that can prevent noise from leaking out of the machine through the air inlet 110 and intrusion of rainwater and dust from the outside of the machine while securing air intake into the machine.

  However, in the intake duct 100 having the above structure, an intake amount corresponding to the passage area of the intake port 110 and the intake passage 126 following the intake port 110 cannot be obtained, and the soundproof box is provided despite the provision of the intake guide 140. It has not been possible to completely prevent infiltration of rainwater into the interior.

  Then, as a result of investigating the cause of the occurrence of such a problem, it was found that the cause was a local rise in the wind speed at the upper end side of the intake port 110.

  That is, due to such a local increase in wind speed, as shown by the two-dot chain line arrow in FIG. 7B, the wall (air curtain) of the intake flow obliquely crossing the intake air flow path 126. Is formed, water droplets accumulated on the upper side 110a of the intake port 110 are carried into the machine by the rapid intake flow, and the flow of upward intake air passing through the flow passage 126 is blocked by the wall of the intake flow. It was found that the smooth intake of air into the cabin was hindered.

  Therefore, as shown in FIG. 8, the applicant of the present application has installed a body-side guide 220 corresponding to the guide 120 of FIG. 7 and a flow path 226 surrounded by the side walls 223 and 224, and further an intermediate guide 230 Are arranged, a flow passage 226 formed in the intake guide 240 is divided into a flow passage 226a on the side wall 205 side of the intermediate guide 230 and a flow passage 226b on the inside of the machine. 200 succeeds in increasing the amount of intake air and preventing rainwater from entering (see Patent Document 1).

Japanese Patent No. 4603573

  The intake duct 200 described in the above-mentioned Patent Document 1 prevents the noise generated in the soundproof box from leaking out of the machine and, compared to the conventional intake duct 100 described with reference to FIG. It is excellent in that it can increase the amount of intake air and prevent infiltration of rainwater.

  However, even with the intake duct 200 (see FIG. 8) of Patent Document 1 having such excellent characteristics, the effect of blocking the leakage of noise from the intake duct 200 trying to escape downward from above is weak. , An intake port 210 is provided below the side wall 205 of the soundproof box, and the position of the intake duct 200 is close to a sound source such as an engine, and / or due to the arrangement of internal devices, If conditions such as a sufficient height cannot be secured, as shown in FIG. 9, noise generated in the soundproof box may leak out of the machine without being blocked by the intake guide 240. .

  For this reason, even when the intake duct and the housing equipment must be provided in the above-described positional relationship due to design restrictions or the like, a structure of the intake duct that can reliably prevent noise leakage is required.

  Therefore, as shown in FIG. 2, the inventor of the present invention attempted to project horizontally from the side wall 205 to the inside of the machine above the flow paths 226a and 226b of the intake duct 200 introduced as Patent Document 1. By providing a top plate 228 to cover the upper portions of the flow paths 226a and 226b, as shown by the dashed arrows in FIG. 9, the noise that tries to pass through the flow paths 226a and 226b downward from above is cut off. Tried.

  As a result, the addition of the top plate 228 succeeded in improving the soundproofing performance of the intake duct 200. However, it has been confirmed that this configuration change has reduced the amount of intake air into the soundproof box. However, it has been found that the original function of cooling air introduction into the soundproof box, which the intake port 210 and the intake duct 200 should have, is deteriorated.

  Therefore, the structure of the intake duct 200 shown in FIG. 2 cannot be directly used, and the original function of the intake duct, which introduces cooling air into the soundproof box, is maintained or improved while preventing noise leakage. A structure of the intake duct that can improve the performance is required.

  In addition, the sound that is felt as noise outside the machine includes the sound of the housing equipment leaked from the soundproof box, and the vibration and noise generated by the operation of the housing equipment causing the side walls of the soundproof box to vibrate (resonate). The generated vibration sound is also included.

  Therefore, if the intake duct is provided on the side wall of the soundproof box (the above-described intake guide body is attached), the strength (rigidity) of the side wall of the soundproof box can be further improved to make the structure less likely to generate vibration. Noise reduction is also expected.

  Therefore, the present invention is based on the intake duct proposed by the applicant of the present application, which is introduced as the above-mentioned Patent Document 1, and proposes a further improvement of this intake duct, and maintains or increases the intake amount. With a structure that can reduce the noise generated by the vibration (resonance) of the side wall of the soundproof box, while also preventing the noise generated inside the soundproof box from leaking out of the machine. It is intended to provide an intake duct for a sound box.

  Hereinafter, means for solving the problems will be described together with reference numerals used in embodiments for carrying out the invention. This code is used to clarify the correspondence between the description of the claims and the description of the embodiment for carrying out the invention. Needless to say, the reference numeral is limitedly used for interpreting the technical scope of the present invention. It is not something that can be done.

In order to achieve the above object, the air intake duct 1 of the soundproof box of the present invention
A suction guide 40 is formed on the inner surface of the side wall 5 at a position where the suction port 10 formed in the side wall 5 of the soundproof box is formed, and the suction guide 40 faces the entire surface of the suction port 10, The lower side 20b faces the lower side 10b of the intake port 10, and the main body side guide body 20 in which the upper side 20a is disposed above the upper side 10a of the air intake port 10, and from both ends in the width direction of the main body side guide body 20, respectively. Side plates 23 and 24 protruding toward the side wall 5, and a lower side 10b of the intake port 10 interposed between the main body side guide 20 and the side wall 5 to face a part of the intake port 10. And an intermediate guide body 30 in which a lower side 30b faces between the upper side 10a and the upper side 30a is disposed above the upper side 10a of the intake port 10. The intermediate guide body 30 is formed between the side wall 5 and the intermediate guide body 30. ~ side The side air passage 26a and the inside passage 26b formed between the intermediate guide body 30 and the main body side guide body 20 allow the intake port 10 to be inserted into the soundproof box which is made negative by the cooling fan 7. In the intake duct 1 of the soundproof box that introduces intake air through
An upper side 30a of the intermediate guide body 30 is provided above an upper side 20a of the main body side guide body 20, and the upper side 30a of the intermediate guide body 30 projects horizontally toward the inside of the machine to protrude horizontally from the inside of the machine. A deflecting plate 33 that covers the path 26b from above is provided.
The upper sides 23a, 24a of the side plates 23, 24 are provided above the upper side 30a of the intermediate guide body 30, and between the upper sides 23a, 24a of the side plates 23, 24, horizontal from the side wall 5 toward the inboard side. A top plate 28 that projects in the direction and covers the side wall-side flow path 26a from above,
An outlet 25a of the side wall-side flow path 26a is opened between the inboard side edge 28a of the top plate 28 and the inboard side edge 33a of the deflecting plate 33. The air outlet 25b of the in-machine flow path 26b is opened between the upper side 20a of the main body side guide 20 (claim 1).

The main body-side guide body 20 protrudes from the lower side 21b of the main body-side guide plate 21 toward the side wall 5 and is disposed on the lower side 10b of the intake port 10 in parallel with the side wall 5. It can be formed by the main body side inclined plate 22 facing the lower side 22b (20b).
The intermediate guide body 30 has an intermediate guide plate 31 disposed in parallel between the main body side guide plate 21 and the side wall 5, and projects from the lower side 31 b of the intermediate guide plate 31 toward the side wall 5, and has the air inlet port. An intermediate inclined plate 32 having a lower side 32b (30b) facing between a lower side 10b and an upper side 10a of 10 and the deflecting plate 33 projecting from an upper side of the intermediate guide plate 31 (the upper side 30a of the intermediate guide body 30). (Claim 2).

  With the configuration of the present invention described above, the following remarkable effects can be obtained in the intake duct 1 of the soundproof box of the present invention.

  Each of the two flow paths, the side wall flow path 26a and the inside flow path 26b, formed in the intake duct 1 is formed as a flow path that deflects the intake air introduced through the intake port 10 upward. In addition, by providing the top plate 28 and the deflecting plate 33, the air outlet 25a of the side wall-side flow path 26a and the air outlet 25b of the inside-side flow path 26b are both horizontally directed toward the inside of the machine. By opening in the direction, both the flow paths 26a and 26b could be formed as a bent flow path (substantially inverted Z-shaped flow path: see FIG. 1B).

  As a result, noise from a sound source such as an engine or noise reflected on the inner surface of the soundproof box can be prevented from leaking directly to the outside of the noise box through the intake port 10. Since the upper part of the inner flow path 26b is covered by the top plate 28 and the deflecting plate 33, respectively, even when the intake duct 1 is provided at a lower position of the soundproof box, the flow paths 26a, 26b It is possible to block the noise that tries to pass through, and achieve a high soundproofing effect even when the intake duct 1 needs to be provided at the lower part of the soundproof box due to its design.

  Further, the side plates 23, 24 are extended upward so that the upper sides 23a, 24a of the side plates 23, 24 are positioned higher than the upper side 30a of the intermediate guide body 30, and the upper side 23a, 24a is With the configuration in which the plate 28 is erected, the intake guide body 40 has a frame-like structure that is connected by the top plate 28, left and right side plates 23 and 24, and the main body side inclined plate 22 over the entire circumference in four directions, up, down, left, and right. The strength (rigidity) of the side wall 5 is improved by attaching the intake guide body 40 having the improved strength (rigidity) to the inner surface of the side wall 5. As a result, the side wall 5 of the soundproof box is made difficult to vibrate (resonate), thereby suppressing the generation of vibration noise and reducing noise.

  Moreover, in the configuration in which the top plate 28 and the deflecting plate 33 are provided as described above, the flow of the intake air introduced into the machine through the side wall passage 26a and the flow of the intake air introduced into the machine through the inside passage 26b. The intake air flow can be guided horizontally to the cooling fan 7 without interfering with the flow of the intake air, and as a result, the intake air can be smoothly introduced into the machine and the intake air amount (air volume) can be maintained. The noise prevention effect described above could be improved while increasing or increasing.

  The main body-side guide body 20 is formed by the main body-side guide plate 21 and the main body-side inclined plate 22, and the intermediate guide body 30 is formed by the intermediate guide plate 31, the intermediate inclined plate 32, and the deflecting plate 33. Thus, the intake guide body 40 can be formed into a relatively simple shape, and the main body side guide body 20 and the intermediate guide body 30 can be formed by bending a metal plate.

FIG. 2A is a view of the intake duct from the outside of the soundproof box, FIG. 2B is a sectional view taken along line BB of FIG. 1A, and FIG. . 7A is a view of the intake duct from the outside of the soundproof box, FIG. 7B is a cross-sectional view taken along line BB of FIG. 7A, and FIG. . It is explanatory drawing which compared the generation | occurrence | production difference of the intake flow with respect to the inside of a soundproof box, (A) is this application (Example), (B) is a comparative example. It is explanatory drawing of a wind speed measurement test (right door), (A) is this application (Example) and (B) Comparative example. It is explanatory drawing of a wind speed measurement test (left door), (A) is this application (Example) and (B) is a comparative example. FIG. 4 is an explanatory diagram illustrating a principle of reducing noise in the intake duct of the present application. (A) is a view of the intake port from the outside of the soundproof box, (B) is a cross-sectional view taken along the line BB of (A), and (C) is a view of the intake guide 140. Perspective view. (A) is a view of an intake port portion viewed from the outside of a soundproof box, and (B) is a BB line of (A). Sectional drawing, (C) is a perspective view of the intake guide 240. FIG. FIG. 11 is an explanatory diagram showing a case where noise can leak in a conventional intake duct having an intermediate guide (Patent Document 1).

  Hereinafter, the intake duct of the soundproof box of the present invention will be described with reference to the accompanying drawings.

(Overall structure)
1 (A) and 1 (B), reference numeral 1 denotes an intake duct of the present invention provided in a soundproof box. This intake duct 1 is provided on any wall surface of the soundproof box, in this embodiment. Is constituted by an intake port 10 formed in a side wall 5 constituting a door of the soundproof box, and an intake guide body 40 that covers the intake port 10 inside the soundproof box. A flow path 26 (26a, 26b) for discharging the airflow introduced through the airbag 10 into the space inside the soundproof box is formed.

[Inlet]
The above-described intake port 10 may be provided on any side wall 5 of the soundproof box. In the present embodiment, the intake port 10 is provided on a side wall configured as a door in the side wall of the soundproof box. By attaching an intake guide body 40, which will be described later, to the portion where the intake port 10 is formed inside the soundproof box, the strength of the door can be improved and vibration noise can be reduced.

  The shape of the intake port 10 is not particularly limited, and may be various shapes such as a polygonal shape, a circular shape, and a geometrical shape, in addition to the rectangular shape shown in the drawing. However, since the shape of a body-side guide body described later is simple and manufacturing is easy, the intake port 10 is preferably rectangular.

  The air inlet 10 may be formed as a single opening, but in the illustrated embodiment, a number of small holes 11 of a predetermined shape are punched in a predetermined pattern in a predetermined range of the side wall 5 of the soundproof box by punching or the like. The intake port 10 is formed by the collection of the small holes.

  In the present embodiment, a large number of rectangular holes 11 are arranged at equal intervals, and the air inlet 10 is covered by a mesh formed by a portion 12 remaining in a grid pattern between the small holes 11. This prevents the intake of relatively large foreign matter such as fallen leaves into the intake port 10 and maintains the strength of the side wall 5.

  However, the intake port 10 may be configured so that the one formed as a single opening in the side wall 5 of the soundproof box is covered with a wire mesh such as a punching metal or a lath.

[Intake guide body 40]
The above-described intake guide body 40 that covers the intake port 10 configured as described above inside the soundproof box is composed of the main body-side guide body 20 and side plates protruding toward the side wall 5 from both ends in the width direction of the main body-side guide body 20. 23, 24, an intermediate guide body 30 disposed between the main body side guide body 20 and a side wall of the soundproof box, a top plate 28 bridged between upper sides 23a, 24a of the side plates 23, 24, and the intermediate guide body It is constituted by a deflecting plate 33 protruding from the upper side 30a of 30.

  The main body-side guide body 20 includes a rectangular main body-side guide plate 21 disposed in parallel with the inner surface of the side wall 5 of the soundproof box at the position where the intake port 10 is formed. The lower side 21b protrudes downward from the lower side 21b toward the lower side 10b of the intake port 10, with the lower side 22b (20b) facing the lower side 10b of the intake port 10, and in the present embodiment, the main body connected via a seal. It is constituted by a side inclined plate 22.

  Side plates 23 and 24 project from both sides in the width direction of the main body side guide plate 21 toward the side wall 5, and the side plates 23 and 24 are fixed to the side wall 5 by bolts and nuts as an example. , The side plates 23 and 24 and the main body side guide 20 are both attached to the inner surface of the side wall 5.

  The lower sides 23b and 24b of the side plates 23 and 24 are connected to both sides in the width direction of the main body-side inclined plate 22, and the upper sides 23a and 24a are connected to the upper side 20a of the main body-side guide 20 and described later. The intermediate guide 30 is disposed above (at a higher position) than the upper side 30a.

  Therefore, the front side of the air inlet 10 on the inside of the machine is covered by the main body side guide plate 21 of the main body side guide 20, and the width direction of the air inlet 10 is covered by two side plates 23 and 24 and the main body side inclined plate 22. Is covered so that the airflow introduced into the intake guide body 40 can be guided to the upper side, which is the remaining one direction of the intake port 10. .

  The main body-side guide body 20 is formed so that its upper side 20a is higher than the upper side 10a of the intake port 10. Thus, the front side of the intake port 10 inside the soundproof box is completely covered. The main body-side guide 20 is configured to block noise that tends to leak out of the machine through the intake port 10.

  The main body side inclined plate 22 provided on the main body side guide body 20 is inclined downward from the bottom side 21b of the main body side guide plate 21 toward the lower side 10b of the intake port 10 [FIG. )], So that rainwater or the like that has entered the intake port 10 can be discharged from the intake port 10 by the inclination of the main body side inclined plate 22.

  Although not shown, a sound absorbing material may be attached to the surfaces of the main body side guide 20 and the side plates 23 and 24 on the inner side of the soundproof box to increase the sound absorbing effect.

  In this manner, the above-described intermediate guide 30 is disposed in the space surrounded by the inner surface of the side wall 5 of the soundproof box, the main body-side guide 20, and the side plates 23, 24.

  That is, the intake port 10 is vertically divided by the intermediate guide 30 at a predetermined position between the upper side 10a and the lower side 10b, and the flow path 26 formed in the intake guide 40 is The intermediate guide 30 is divided into a side wall-side passage 26a formed on the side wall 5 side of the soundproof box and an inside-side passage 26b formed on the inside of the machine (on the side of the body-side guide 20).

  In the illustrated embodiment, the intermediate guide body 30 is disposed substantially parallel between the side wall 5 of the soundproof box and the main body side guide plate 21 and faces the inner surface of the side wall 5 of the soundproof box at the position where the intake port 10 is formed. At the same time, a rectangular intermediate guide plate 31 having both sides fixed to the side plates 23 and 24, and a lower side 31b of the intermediate guide plate 31 projecting downward from the lower side 31b toward the side wall 5 of the soundproof box. 10 is formed by an intermediate inclined plate 32 which divides 10 in the height direction, and a deflecting plate 33 which projects horizontally from the upper side of the intermediate guide plate 31 (the upper side 30a of the intermediate guide body 30) toward the inside of the machine. The guide 30 (the intermediate guide plate 31 and the intermediate inclined plate 32) covers a part (upper half) of the intake port 10.

  In the illustrated embodiment in which the intake passage 26 formed in the intake guide 40 is divided into two by the single intermediate guide 30, the intermediate guide plate 31 of the intermediate guide 30 is connected to the soundproof box. It is arranged at a substantially intermediate position of the interval between the inner wall 5 and the main body side guide plate 21 and the lower side 32b (30b) of the intermediate inclined plate 32 is arranged toward the center position in the height direction of the intake port 10. The flow passage 26 formed in the intake guide 40 is divided into two so that the side wall side flow passage 26a and the in-machine flow passage 26b have substantially the same flow passage area.

  A plurality of the intermediate guides 30 may be provided according to the sizes of the intake port 10 and the intake guide 40. In this case, the flow path 26 and the intermediate guide 30 may be provided according to the number of the intermediate guides 30 to be used. The arrangement of each intermediate guide body 30 is adjusted so that the intake port 10 is divided at substantially equal intervals.

  Further, as shown in FIG. 1, the intake port 10 is divided into upper and lower parts, and the side wall 5 is left in a cross section at the boundary between the upper and lower intake ports. The lower side 30b is arranged so as to face the side wall 5 of the portion left in the crosspiece, and a predetermined gap δ is provided between the lower side 30b and the lower side 30b of the intermediate guide body 30 so that rainwater or the like can pass downward through this portion. It is good also as what makes it fall easily.

  The upper side 30a of the intermediate guide body 30 is arranged not only above the upper side 10a of the intake port 10 (high place) but also above the upper side 20a of the main body side guide body 20 (high place). When a plurality of intermediate guides 30 are provided, the intermediate guides 30 are arranged stepwise so that the position of the upper side 30a is sequentially increased from the main body side guide 20 side to the side wall 5 side.

  The arrangement of the upper side 30a of the intermediate guide 30 and the upper sides 23a, 24a of the side plates 23, 24 described above is such that a top plate 28 described later is erected between the upper sides 23a, 24a of the side plates 23, 24, and the intermediate guide 30 When a later-described deflecting plate 33 is provided on the upper side 30a, the interval W between the upper side 20a of the main body-side guide 20 and the top plate 28 is substantially bisected in the height direction (a plurality of intermediate guides 30 and a plurality of deflecting plates 33 are provided) The distance w1 between the top plate 28 and the deflecting plate 33 and the distance w2 between the deflecting plate 33 and the upper side 20a of the main-body-side guide plate 20 are equal to each other between the side wall 5 and the intermediate guide plate 31. Is adjusted to be equal to or greater than the interval w3 of the intermediate guide plate 31 and the interval w4 between the intermediate guide plate 31 and the main body side guide plate 21.

  As shown in FIG. 1 (B), the deflecting plate 33 provided on the upper side 30a of the intermediate guide body 30 extends inward from the upper side 30a of the intermediate guide body 30 so as to cover the upper side of the inside flow path 26b. It is formed to protrude in the horizontal direction.

  The deflecting plate 33 must be formed so as to project at least so as to cover at least the inside flow path 26b formed in the intake guide body 40. In the illustrated embodiment, the deflecting plate 33 is formed. Is extended to a position intersecting an extension line extending upward from the side wall 5 side surface of the main body side guide plate 21. However, the deflection plate 33 is further extended to the inside of the machine [ 1B in FIG. 1B).

  As described above, when a plurality of intermediate guides 30 are provided, the inner side edges 33a of the deflecting plates 33 of all the intermediate guides 30 intersect with the extension of the surface of the main body-side guide plate 21 on the side wall 5 side. However, only the deflecting plate 33 provided on the intermediate guide 30 disposed on the innermost side of the machine may be extended to the above-described position, and the deflecting plates 33 of the other intermediate guides 30 The intermediate guide plate 31 may be extended at least to the position adjacent to the intermediate guide plate 31 provided on the other intermediate guide body 30 at a position crossing the extension of the surface of the intermediate guide plate 31 on the side wall 5 side.

  Further, a top plate 28 is provided between the upper sides 23a, 24a of the side plates 23, 24, and the top plate 28 covers at least the upper side of the side channel 26a.

  Thus, the top plate 28 only needs to cover at least the upper side of the side wall-side flow path 26a. In the example shown in FIG. 1B, the top plate 28 extends from the side wall 5 toward the inside of the machine. The inboard end 28a is arranged at a position intersecting with an extension of the surface on the side wall 5 side of the main body side guide plate 21. At least the inboard end 28a is located on the side of the intermediate guide plate 31 on the side wall 5 side. What is necessary is just to extend to the position which intersects the extension line.

  By providing the top plate 28 and the deflecting plate 33 in this manner, a horizontal direction toward the inside of the soundproof box is provided between the inside edge 28a of the top plate 28 and the inside edge 33a of the deflecting plate 33. An opening 25a of the side wall-side flow path 26a that opens is formed, and a horizontal direction toward the inside of the soundproof box is provided between the inner side edge 33a of the deflection plate 33 and the upper side 20a of the main body side guide 20. An opening 25b of the inside passage 26b is formed.

[Action, etc.]
In the soundproof box provided with the intake duct 1 configured as described above, when the cooling fan 7 arranged in the soundproof box is rotated to make the inside of the soundproof box negative, in response to the generation of the negative pressure, Outside air is sucked into the soundproof box through the intake duct 1.

  The air sucked into the inside from outside the soundproof box is sucked in through the air inlet 10, and is formed in a space surrounded by the inner surface of the side wall 5 of the soundproof box and the suction guide 40. Is deflected to an upward flow.

  The above-described intake port 10 is vertically divided into two parts by a lower side 30b of the intermediate guide body 30 in the intake guide body 40, and the intake passage 26 formed in the intake guide body 40 is formed by the intermediate guide body 30. Since the side wall side passage 26a and the inboard side passage 26b are divided into two so as to have substantially the same passage area, the upper side of the intake port 10 is bordered by the arrangement position of the lower side 30b of the intermediate guide 30. The air flow sucked in on the 10a side is deflected to an upward flow by the side wall side flow path 26a, and then blown between the inboard side edge 28a of the top plate 28 and the inboard side edge 33a of the deflecting plate 33. Through the outlet 25a, it is introduced horizontally into the machine.

  On the other hand, the intake air sucked in on the lower side 10b side of the intake port 10 is deflected to an upward flow by the inboard flow path 26b, and then the inboard side edge 33a of the deflecting plate 33 and the upper side 20a of the main body side guide plate 20. The air is introduced into the inside of the machine in a horizontal direction through an air outlet 25b formed between the air outlets.

  Thus, in the intake duct 1 of the present invention, by providing the top plate 28 and the deflecting plate 33, it is possible to improve the soundproofing effect while maintaining the intake air amount or increasing the intake air amount. It can be done.

  That is, as shown in FIG. 2, only the top plate 228 that covers the upper part of the flow path 226 (226a, 226b) formed in the intake guide 240 is provided without providing a configuration corresponding to the deflection plate 33 in the present application. When the cause of the decrease in the amount of intake air in the provided intake duct 200 was examined, in the configuration in which the upper portions of the flow paths 226a and 226b were covered with the common top plate 228, as shown in FIG. The intake air flow from the side flow path 226a and the intake air flow from the main body side flow path 226b both collide with the top plate 228 and merge, and thereafter are deflected horizontally toward the inside of the machine. It is considered that the intake air flow introduced from the two flow paths 226a and 226b at the lower portion interferes with each other to cause turbulence in the air flow, thereby reducing the intake air amount (air flow amount).

  On the other hand, in the configuration of the intake duct of the present invention, as shown in FIG. 3A, the intake air introduced through the side wall-side passage 26a passes through the outlet 25a for the side wall-side passage 26a. The intake air flow which is discharged horizontally toward the inside of the cabin and introduced through the inside cabin passage 26b is directed horizontally toward the inside of the cabin through the outlet 25b for the inside cabin passage 26b. It is considered that the intake air flow discharged and introduced through the two flow paths 26a and 26b is smoothly introduced without interference, and thus, it is possible to prevent a decrease in the amount of intake air.

  Moreover, even in the configuration of the intake duct 100 without the top plate (the configuration described in Patent Document 1), if the outlet of the intake duct is provided at a higher position with respect to the cooling fan 207, the side wall-side flow path The airflow passing through the airflow passage 226a toward the cooling fan 207 crosses in front of the air outlet of the airflow passage 226b in the airflow passage, and may hinder the intake of air through the airflow passage 226b. As shown in FIG. 3A, the airflow from one flow path does not cross the other flow path, and as a result, in the configuration of the intake duct 1 of the present invention, the intake air introduced as Patent Document 1 In comparison with the duct, the intake air amount can be increased.

  On the other hand, as shown in FIG. 6, in the configuration of the intake duct 1 of the present application, the upper part of the side wall-side flow path 26a is covered with the top plate 28, and the upper part of the in-machine flow path 26b is the deflection plate 33 (see In the embodiment, the air intake duct 1 is formed at a low position of the soundproof box by being covered with both the deflection plate 33 and the top plate 28), and is located close to the sound source or the height of the main body side guide 20. Even if it is not possible to remove the noise sufficiently, it is possible to block the noise trying to enter the flow passages 26a and 26b downward, and since the flow passage is formed in a substantially Z shape, the noise is directly It cannot leak out of the machine through the flow paths 26a and 26b.

  Further, the strength (rigidity) of the intake guide 40 is improved by arranging the top plate 28 between the upper sides 23a, 24a of the side plates 23, 24, and the strength of the side wall 5 of the soundproof box to which the intake guide body 40 is attached ( The rigidity) is also increased, so that the side wall 5 is hardly vibrated (resonated), and the generation of vibration noise is suppressed, thereby improving the soundproofing.

(Comparative test example)
The results of a comparison test of the intake air amount of the intake duct of the present invention configured as described above (Example) and the intake air amount of the intake duct of the comparative example shown in FIG. 2 are shown below.

  In the test, the intake ducts of the present invention described with reference to FIG. 1 and the comparative examples described with reference to FIG. Each intake duct was formed, and the wind speed of the intake air was measured.

  FIGS. 4A and 4B show the state of attachment of the intake guides 40 and 240 to the door (door) provided on the right side of the soundproof box, and the measurement position of the wind speed. FIG. It is a comparative example.

  FIGS. 5A and 5B show the installation state of the air intake guide to the door (door) provided on the left side of the soundproof box and the measurement position of the wind speed. FIG. It is an example.

The intake guide body 40 used in the embodiment of the present application and the intake guide body 240 used in the comparative example are:
In the intake guide body 40 of the embodiment, the upper side of the intermediate guide body is disposed higher than the upper side of the main body side guide body, whereas in the intake guide body 240 of the comparative example, the upper side of the intermediate guide body is That the upper side of the side guide is formed at the same height,
The intake guide body 40 of the embodiment has a deflecting plate projecting horizontally from the upper side of the intermediate guide body, whereas the intake guide body 240 of the comparative example has no member corresponding to the deflecting plate. , And only the other points are common.

  The wind speed was measured by the above test, and the wind speed measured at each measurement point was calculated for the right and left doors. 1 is shown.

  The wind speed ratio in the table represents the ratio of the wind speed of the example to the wind speed of the comparative example, and was obtained as “(wind speed of the example / wind speed of the comparative example) × 100 (%)”.

  As a result, in both the left and right doors, the intake duct of the present invention has a higher average intake wind speed than the intake duct of the comparative example, and therefore, the air that can be taken into the soundproof box in the same time. It has been confirmed that the volume (air volume) is large, and it has been confirmed that the intake duct of the present invention can maintain both the intake air volume for the soundproof box and the improvement of the soundproof performance.

DESCRIPTION OF SYMBOLS 1 Intake duct 5 Side wall of soundproof box 7 Cooling fan 10 Intake port 10a Upper side (of intake port)
10b Bottom side (of intake port)
11 Small hole 12 Portion remaining between small holes 20 Main body side guide 20a Upper side (of main body side guide)
20b Lower side (of main body side guide)
21 Body side guide plate 21b Lower side (of body side guide plate)
22 Main body side inclined plate 22b Lower side (of main body side inclined plate)
23, 24 Side plate 23a, 24a Upper side (of side plate)
23b, 24b Lower side (of side plate)
25a outlet (of the side wall side flow path)
25b Air outlet (inside the machine flow path)
26 Flow path 26a Side wall flow path 26b Inside machine path 28 Top plate 28a Inside machine side edge (of top plate)
30 intermediate guide 30a upper side (of intermediate guide)
30b Lower side (of intermediate guide)
31 Intermediate guide plate 31b Lower side (of intermediate guide plate)
32 Intermediate inclined plate 32b Lower side (of intermediate inclined plate)
33 Deflection plate 33a Inside edge of machine (deflection plate)
40 Air intake guide δ Gap W interval (between top plate and upper side of body side guide)
w1 interval (between top plate and deflection plate)
w2 interval (between the deflecting plate and the upper side of the body side guide)
w3 interval (between side wall and intermediate guide plate)
w4 interval (between intermediate guide plate and main body side guide plate)
100,200 Intake duct 105,205 Side wall 107,207 of soundproof box Cooling fan 110,210 Inlet 110a Upper side (of intake)
110b Lower side (of intake port)
120 guide body 220 body side guide body 120b lower side (of guide body)
123, 124, 223, 224 Side wall 126, 226 Flow path 140, 240 Intake guide 226a Flow path (side wall side)
226b Channel (inside machine)
228 Top plate 230 Intermediate guide

Claims (2)

It is formed by attaching an air intake guide to the inner surface of the side wall at a position where the air inlet formed in the side wall of the soundproof box is formed. The air intake guide faces the entire surface of the air inlet and is provided on the lower side of the air inlet. A body-side guide body having a lower side facing and an upper side arranged above the upper side of the intake port; side plates formed to project toward the side walls from both ends in the width direction of the body-side guide body; A lower side faces between a lower side and an upper side of the intake port, and is disposed above the upper side of the intake port. An intermediate guide body is provided, and a side wall side passage formed between the side wall and the intermediate guide body, and a machine side passage formed between the intermediate guide body and the main body side guide body are operated by a cooling fan. In the pressurized soundproof box, In the intake duct of the soundproof box for introducing the intake air through the mouth,
An upper side of the intermediate guide body is provided above an upper side of the main body side guide body, and the upper side of the intermediate guide body projects in a horizontal direction toward the inside of the machine to cover the inside flow path of the machine above. With a deflection plate,
An upper side of the side plate is provided above an upper side of the intermediate guide body, and a space between the upper side of the side plate, which projects horizontally from the side wall toward the inside of the machine to cover the side wall side passage upward. A board is erected,
An outlet for the side wall-side flow path is opened between the inboard side edge of the top plate and the inboard side edge of the deflecting plate, and between the inboard side edge of the deflecting plate and the top side of the main body side guide. An air intake duct for the soundproof box, characterized in that an air outlet of the inside air passage is opened. The main body side guide is formed by a main body side guide plate disposed in parallel with the side wall, and a main body side inclined plate protruding from a lower side of the main body side guide plate toward the side wall and facing a lower side to a lower side of the intake port. Form,
An intermediate guide plate disposed in parallel between the main body side guide plate and the side wall, a middle guide plate protruding from a lower side of the intermediate guide plate toward the side wall, and a lower side between the lower side and the upper side of the intake port. 2. An air intake duct for a soundproof box according to claim 1, wherein the air intake duct is formed by an intermediate inclined plate facing the first plate and the deflection plate protruding from an upper side of the intermediate guide plate.

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