JP5718151B2 - Engine working machine - Google Patents

Description

  The present invention relates to an engine working machine in which a working machine such as a generator and an engine for driving the working machine are housed inside a soundproof casing, and more specifically, an engine having an intake duct and an exhaust duct in the casing. It relates to work equipment.

  As a soundproof type engine working machine, for example, an engine generator, an intake duct for sucking outside air for engine combustion and equipment cooling is installed in a peripheral wall portion of a casing having a soundproof structure in which the generator and the engine are housed. In order to reduce the noise level of the generator, a sound absorbing material is pasted on the inner surface of each duct in order to form an exhaust duct for discharging warm exhaust air to the outside (for example, patents) Reference 1).

  Further, in the engine working machine 31 as shown in FIG. 4, a plurality of bent portions 33 a and 34 a are formed in the intake duct 33 provided in the side wall portion of the casing 32 and the exhaust duct 34 provided in the ceiling portion. The corner portions of the bent portions 33a and 34a are respectively provided with rectifying plates 35 and 36 which are air conditioning members for guiding the flow of the outside air A1 sucked from the outside of the casing and the exhaust air A2 discharged from the inside of the casing, Furthermore, a sound absorbing material 37 for reducing the exhausted sound is attached to the inner surface of the rectifying plate 36 provided in the exhausted duct 34.

JP 2009-121244 A

  However, if a sound-absorbing material having a sufficient thickness for attaching a soundproofing effect is attached to a rectifying plate or the like, there is a problem that the ventilation cross-sectional area of the duct is reduced and the air volume is reduced. On the other hand, if the thickness of the sound absorbing material is made too thin in order to ensure the ventilation cross-sectional area, the noise B1 passes through the sound absorbing material 37 and is reflected by the rectifying plate 36, for example, as shown in FIG. Therefore, there is a problem that the noise B1 leaks to the outside from the exhaust port of the exhaust duct 34.

  Therefore, an object of the present invention is to provide an engine working machine capable of enhancing the soundproofing effect while ensuring a sufficient ventilation cross-sectional area of a duct.

In order to achieve the above object, an engine work machine according to the present invention includes an intake duct that sucks outside air into a casing that houses a work machine and an engine that drives the work machine, and an exhaust air that discharges exhaust air in the casing. and a duct in the engine working machine to form a bent portion in the intake duct and the exhaust air duct, the intake duct, an intake inlet for sucking the outside air is open at below the casing in the intake duct An intake outlet that opens above the intake inlet and discharges outside air in the intake duct to the exhaust duct, and a lower passage that is provided horizontally from the intake inlet toward one side of the casing, A lower bent portion bent upward from an end portion of the lower passage, and a gas filled in a corner portion of the lower bent portion to guide the flow of outside air from the lower passage toward the upper bent portion. A lower sound-absorbing material that absorbs noise that forms a curved surface, an upper passage provided in a direction parallel to the lower passage from the upper bent portion toward the intake outlet, and a corner portion of the upper bent portion is filled And an upper sound-absorbing material that absorbs noise that forms a guide surface that guides the flow of outside air from the lower bent portion toward the upper passage, and is sucked into the lower passage along with the outside air. water, is characterized in that said the guide surface of the lower bent portion and entering the inside of the lower sound absorbing material is separated from the outside air flow is a function that is discharged from the lower side of the casing.

Moreover, it is preferable that the said sound-absorbing material becomes a triangular prism shape which made the said corner part the vertex, or the curved surface which becomes convex toward the said corner part side. Further, wherein the intake duct, toward the draining member to separate before Symbol water entrained in the ambient air that flows along the guide surface of the lower sound absorbing material on the upper end of the lower sound absorbing material from the outside air flows inside the duct projecting It is preferable to do. The sound absorbing material is preferably a molded product of a flexible polyurethane foam.

  According to the engine working machine of the present invention, the corner portion of the bent portion provided with the intake duct and the exhaust duct is filled with the sound absorbing material that absorbs noise, and the duct inner surface side of the sound absorbing material is used as the guide surface. The sound absorbing material can sufficiently absorb noise, and the ventilation cross-sectional area of the duct can be sufficiently secured.

  In addition, by forming the sound absorbing material into a triangular prism shape, the moldability can be improved, and by making the guide surface a curved surface, the flow of outside air and exhaust air flowing in the duct can be smoothed, and the guide surface Can reduce the reflection of noise. Furthermore, by providing a draining member at the upper end of the lower sound absorbing material that forms a guide surface that guides the flow of outside air from the lower passage toward the upper bent portion, the outside air that flows along the guide surface of the lower sound absorbing material. The water accompanying the water can be effectively separated from the flow of the outside air, and rainwater and the like can be more reliably prevented from entering the casing.

It is explanatory drawing which shows the duct of the engine working machine which shows the 1st example of this invention. It is II-II sectional drawing of FIG. It is explanatory drawing which shows the duct of the engine working machine which shows the 2nd form example of this invention. It is explanatory drawing which shows the duct of the conventional engine working machine.

  1 and 2 show a first embodiment of the engine working machine according to the present invention. The engine working machine 11 is divided into a device chamber 13 and an exhaust chamber 14 by dividing the casing 12 by a partition wall 12a. In addition, a working machine (not shown) such as a generator or a hydraulic pump and an engine 15 for driving the working machine are arranged in the equipment room 13, and a radiator 16 having a cooling fan 16a on the partition wall 12a is provided. It is arranged. The casing side wall portion is provided with a flat rectangular tube-shaped intake duct 17 for sucking combustion air and cooling air into the equipment chamber 13, and the casing ceiling portion is provided with a discharge chamber 14 from the radiator 16. A flat rectangular tubular exhaust duct 18 for exhausting the air (exhaust air) discharged to the outside of the casing 12 is provided.

  The intake duct 17 includes an intake inlet 17a that opens to the outside of the casing 12 below the side wall of the casing 12, an intake outlet 17b that opens to the inside of the equipment chamber 13 above the intake inlet 17a, and the intake inlet 17a. A lower passage 17c provided horizontally in one side along the side wall of the casing 12, a lower bent portion 17d bent upward from an end of the lower passage 17c, and the lower bent portion 17d An upper bent portion 17e bent toward the intake outlet 17b from an upper portion thereof, and an upper passage 17f provided in a direction parallel to the lower passage 17a from the upper bent portion 17e toward the intake outlet 17b. Have.

  The exhaust duct 18 is provided in a horizontal direction along the casing ceiling, and a first bent portion 18a bent toward the exhaust duct 18 from the upper end portion 14a of the exhaust chamber 14 on the casing end side. And a second bent portion 18c that is bent from the exhaust duct 18 toward the exhaust outlet 18b that opens in the center in the width direction of the casing top plate.

  The corners (entrance corners) of the lower bent part 17d, the upper bent part 17e, the first bent part 18a, and the second bent part 18c are filled with sound absorbing materials 19 and 20 having a function of absorbing noise, respectively. Has been. Each of the sound absorbing materials 19 and 20 is made of, for example, a soft polyurethane foam sound absorbing material or a sound absorbing material with a film in which a film layer is formed on the surface of the foam material, and a well-known synthetic resin porous body having open cells. Can be used. The sound absorbing material 19 disposed in the lower bent portion 17d, the upper bent portion 17e, and the first bent portion 18a is formed in a triangular prism shape of an isosceles triangle whose section is the apex at the corner portion of each bent portion. The inner surface of the duct, which is the base of the triangle, is an inclined guide surface 19a that guides the outside air or exhaust air flowing through each duct from the upstream side to the downstream side of the bent portion. Further, the sound absorbing material 20 disposed at the corner of the second bent portion 18c is a curved guide surface 20a formed of a curved surface in which the inner surface of the duct that guides exhaust air is convex toward the corner. Further, a sheet-like sound absorbing material 21 is attached to the inner surface of the casing constituting each of the ducts 17 and 18 as in the related art.

  Thus, in the engine working machine 11 provided with the sound absorbing material that also serves as a rectifying member inside the duct, the outside air A1 sucked into the lower passage 17c of the intake duct 17 by the action of the cooling fan 16a is bent downward. Guided by an upward inclined guide surface 19a raised from the bottom surface 17g of the portion 17d toward the side surface 17h, and further guided by a downward inclined guide surface 19a raised from the side surface 17h of the upper bent portion 17e toward the upper surface 17i, It flows into the equipment chamber 13 of the casing 12 from the intake outlet 17b through the upper passage 17f. In addition, the exhaust air A2 discharged from the radiator 16 to the exhaust air chamber 14 by the action of the cooling fan 16a moves up the exhaust air chamber 14 to the upper surface 18e of the exhaust air duct 18 from the outer surface 18d of the first bent portion 18a. Guided by a curved guide surface 20a curved toward the exhaust outlet 18b from the lower surface 18f of the second bent portion 18c, the exhaust gas is guided by the downwardly inclined guide surface 19a rising upward and flows in the horizontal direction. The gas is discharged from the outlet 18b to the outside of the casing 12.

  Since the sound absorbing materials 19 and 20 disposed in the bent portions 17d, 17e, 18a, and 18c can have a sufficient thickness, noise B1 such as operation sound of the engine 15 and the like, intake sound, and exhaust sound. Can be effectively absorbed by the respective sound absorbing materials 19 and 20, and the amount of noise reflected by the inclined guide surface 19a can be reduced, and the level of noise leaking from the intake inlet 17a and the exhaust outlet 18b to the outside of the casing 12 can be reduced. It can be lowered sufficiently. In particular, by making the guide surface of the sound absorbing material 20 disposed in the second bent portion 18c a curved guide surface 20a, even if the noise B1 is reflected by the curved guide surface 20a, the reflected noise leaks from the exhaust outlet 18b to the outside. The amount can be reduced.

  In addition, the inner surfaces of the ducts of the sound absorbing materials 19 and 20 are guide surfaces 19a and 20a, and the sound absorbing materials 19 and 20 allow the outside air or the exhaust air flowing through the ducts 17 and 18 to bend the bent portions 17d, 17e, 18a, Since it also serves as a rectifying member that guides from the upstream side to the downstream side of 18c, it effectively guides the flow of outside air flowing in the intake duct 17 and the flow of exhaust air flowing in the exhaust duct 18 from the upstream side to the downstream side. can do. Further, by setting the positions of the guide surfaces 19a and 20a in the respective sound absorbing materials 19 and 20 to the same positions as those of the conventional rectifying plate, even if the sound absorbing materials 19 and 20 having a sufficient thickness are used, A sufficient ventilation cross-sectional area can be secured.

  Further, water (rain water) R1, which is accompanied by the outside air A1 sucked from the intake inlet 17a and rises along with the inclined air along the inclined guide surface 19a of the sound absorbing material 19 filled in the lower bent portion 17d, is absorbed by the inclined guide surface 19a. It enters the inside of the material 19 and flows downward in a state separated from the flow of outside air, and is discharged below the casing 12 from a drain port (not shown) provided at an appropriate position on the bottom surface of the lower passage 17c. The

  FIG. 3 shows a second embodiment of the present invention. Components that are the same as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In the air intake duct 17 shown in the present embodiment, a draining member 22 protruding toward the inside of the air intake duct 17 is provided at the upper end portion of the sound absorbing material 19 disposed in the lower bent portion 17d.

  By providing such a draining member 22, the water (rain water) that is accompanied by the outside air along the inclined guide surface 19a of the sound absorbing material 19 that is entrained by the outside air A1 sucked from the intake inlet 17a and filled in the lower bent portion 17d. R1 can be reliably separated from the flow of outside air by the draining member 22, and rainwater can be more reliably prevented from entering the equipment chamber 13 from the intake outlet 17b through the upper passage 17f.

  The present invention is not limited to the above-described embodiments, and the shape of the duct is arbitrary, and the sound absorbing material that also serves as the rectifying member can be arbitrarily positioned according to the shape of the duct, particularly the shape of the bent portion. It is possible to provide in the shape of. In addition, the shape of the guide surface (the inner surface of the duct) of the sound absorbing material can be an uneven surface.

  DESCRIPTION OF SYMBOLS 11 ... Engine working machine, 12 ... Casing, 12a ... Partition wall, 13 ... Equipment room, 14 ... Exhaust chamber, 14a ... Upper end part, 15 ... Engine, 16 ... Radiator, 16a ... Cooling fan, 17 ... Intake duct, 17a Intake inlet 17b Intake outlet 17c Lower passage 17d Lower bent portion 17e Upper bent portion 17f Upper passage 17g Bottom surface 17h Side surface 17i Upper surface 18 Exhaust duct 18a ... 1st bending part, 18b ... Exhaust outlet, 18c ... 2nd bending part, 18d ... Outer surface, 18e ... Upper surface, 18f ... Lower surface, 19, 20, 21 ... Sound absorbing material, 19a ... Inclined guide surface, 20a ... Curved guide Surface, 22 ... draining member

Claims (5)

An intake duct for sucking the outside air in the casing which houses an engine for driving the working machine and the working machine, and a wind exhaust duct for discharging the exhaust air in the casing, to the intake duct and the exhaust air duct In the engine working machine with a bent part,
The intake duct opens below the casing and sucks outside air into the intake duct, and the intake duct opens above the intake inlet and discharges outside air inside the intake duct to the exhaust duct. An outlet, a lower passage provided horizontally from the intake inlet toward one side of the casing, a lower bent portion bent upward from an end of the lower passage, and a corner angle of the lower bent portion A lower sound-absorbing material that absorbs noise and forms a guide surface that guides the flow of outside air from the lower passage toward the upper bent portion, and the lower portion from the upper bent portion toward the intake outlet Noise that forms an upper passage provided in a direction parallel to the passage and a guide surface that fills the corners of the upper bent portion and guides the flow of outside air from the lower bent portion toward the upper passage. Absorb Which has a part sound absorbing material,
Water that has been entrained by the outside air and sucked into the lower passage enters the inside of the lower sound absorbing material from the guide surface of the lower bent portion, is separated from the flow of outside air, and is discharged from below the casing An engine working machine characterized by comprising: The engine work machine according to claim 1, wherein the sound absorbing material is formed in a triangular prism shape having the corners as apexes. The engine work machine according to claim 1, wherein the guide surface is a curved surface that is convex toward the corner portion side. The upper end of the lower sound absorbing material, characterized in that projecting toward the draining member to separate the entrained water to the outside air flowing along the guide surface of the lower sound absorbing material from the outside air flow inside the intake duct The engine working machine according to any one of claims 1 to 3. The engine working machine according to any one of claims 1 to 4, wherein the sound absorbing material is a molded product of a flexible polyurethane foam.

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