JP6113121B2 - Engine driven work machine - Google Patents

Description

  The present invention relates to an engine-driven work machine such as an engine-driven generator, an engine-driven welder, and an engine-driven compressor that are mainly used outdoors.

  The engine-driven work machine used in outdoor construction work and the like is for driving a work machine body such as a generator, a welder, and a compressor and the work machine body in a metal soundproof case 1 as shown in FIG. The engine is housed. During operation of the work implement, the work implement main body, engine, engine intercooler, radiator, muffler, etc. generate heat, so the engine fan is rotated inside to take outside air from the intake ports 2 and 3 and After flowing in the soundproof case 1 to cool each part, the air is discharged from the air exhaust port 4.

  Of the intake ports 2 and 3, the intake port 2 closer to the engine is usually provided in a maintenance / inspection door 5. As shown in Patent Document 1, for example, FIG. An intake duct 6 as shown in FIG. The intake duct 6 is for preventing noise inside the machine from leaking outside and preventing rainwater from entering the machine through the air inlet 2.

  The intake duct 6 includes a lower duct portion 6a facing the inner side of the intake port 2 and an upper duct portion 6b that is connected to the upper portion of the intake duct 6 and has an intake outlet 6c at an upper end portion. The road cross-sectional area is made larger than that of the upper duct portion 6b, so that the flow velocity of air in the lower duct portion 6a is slowed so that rainwater sucked together with air from the air inlet 2 can be separated there. . In addition, since the inside of the machine and the outside communicate with each other through a long flow path of the intake duct 6, the engine sound and the fan sound inside the machine are less likely to leak to the outside.

JP2012-57516A

  However, in the conventional engine-driven work machine, since the intake duct 6 protrudes into the machine, the cooling air from the rear intake port 3 is difficult to flow, and cooling of the heat exchanger such as the engine, the intercooler, and the radiator is performed. There was a problem that the effect became worse. In addition, since the intake duct 6 is provided inside the door 5, when the door 5 is opened for maintenance or the like, the intake duct 6 is in the way, and there is a risk of injury if the limb hits the corner. There was also a problem that there was. In addition, when the door 5 is opened, an object hits and the intake duct 6 is deformed, and if there is a gap between the intake duct 6 and the door 5, rainwater entering from the intake port 2 may enter the machine through the gap. In models where there is a storage container that receives fuel or engine oil leakage, the rainwater flows into the storage container, and the fuel or engine oil that has accumulated in the storage container overflows from the storage container, There was a problem of spilling out of the plane.

  Furthermore, in the conventional engine-driven work machine, as shown in FIG. 8, the width of the exhaust chamber 8 is larger than the width of the radiator 9 disposed in the partition wall between the engine chamber 7 and the exhaust chamber 8. Is large, a wide space is formed on both the left and right sides of the exhaust chamber 8. Therefore, as shown by the arrows in FIG. 8, the exhausted air after passing through the radiator 9 is not exhausted from the exhaust port 4 but wraps around the left and right spaces, so that the exhausted air becomes worse. There is also a problem that the cooling effect is lowered accordingly.

  In view of such a problem, the present invention does not obstruct the flow of cooling air from the intake port on the rear side by the intake duct, and when the door is opened, the intake duct may interfere with work or cause injury. It is intended to prevent rainwater from entering the storage container through the intake duct without causing any trouble. Another object of the present invention is to prevent the exhaust air from flowing into the left and right sides of the exhaust chamber.

  In order to solve the above-mentioned problem, the invention according to claim 1 of the present application is that a soundproof case is partitioned into an engine room and an exhaust chamber by a partition, and the engine room and a work machine body driven by the engine are provided in the engine room. The heat exchanger for the engine is disposed in the opening of the partition wall, and an exhaust port is opened in the upper surface of the exhaust chamber, and cooling air is taken in from the intake port and the engine chamber An engine-driven work machine configured to pass through the heat exchanger and then exhaust from the exhaust port through the exhaust chamber, wherein the intake port is provided on a side wall of the exhaust chamber, and the engine is provided in the partition wall. An intake discharge port to the chamber is provided, and the intake port and the intake discharge port communicate with each other through an intake duct.

  The invention according to claim 2 of the present application is the invention according to claim 1, wherein the intake duct forms an air flow path between an inner surface of the intake duct and a side wall of the exhaust chamber. It is characterized by that.

  The invention according to claim 3 of the present application is characterized in that, in the invention according to claim 1 or 2, a partition plate is provided inside the intake duct so as to divide the flow path into a plurality of parts.

The invention according to claim 4 of the present application is characterized in that, in the invention according to claim 3 , the partition plate is bent at an intermediate portion in the air flow direction into an L shape.

The present invention has the following effects.
That is, in the first aspect of the invention, an intake port is provided in the side wall of the exhaust chamber, an intake discharge port to the engine chamber is provided in the partition wall, and the intake port and the intake discharge port communicate with each other through an intake duct. As a result, there is no need to install an air intake duct inside the door, the flow of cooling air from the rear air inlet is not obstructed, and when the door is opened, the air intake duct may interfere with work or cause injury. It will not cause any problems. In addition, since the intake duct is provided in the exhaust chamber, and the bottom of the exhaust chamber usually has a rainwater discharge structure, even if there is a gap in the intake duct, rainwater enters through the intake port and the intake duct. Even if it does, it will be discharged outside by the rainwater discharge structure and will not enter the storage container. In addition, since the intake ducts are disposed on both the left and right sides of the exhaust chamber and the wide space there is blocked, the exhaust air does not circulate on both the left and right sides of the exhaust chamber, and the exhaust of the exhaust air is improved.

  According to a second aspect of the present invention, in the engine-driven work machine according to the first aspect, the intake duct forms an air flow path between an inner surface of the intake duct and a side wall of the exhaust chamber. Therefore, the exhaust chamber has a double structure with the side wall of the exhaust chamber and the air intake duct, so that the soundproofing effect can be improved.

  In the invention according to claim 3, in the engine-driven work machine according to claim 1 or 2, since the partition plate is provided in the intake duct so as to divide the flow path into a plurality of parts, The air flow is unevenly distributed in the engine chamber and discharged to the engine compartment without unevenness.

According to a fourth aspect of the present invention, in the engine-driven work machine according to the third aspect , the partition plate is bent at an intermediate portion in the air flow direction so as to be L-shaped. A bent portion of the partition plate is interposed between the two, so that noise from the engine compartment can be shielded.

It is a figure which shows the exhaust air chamber inside of the engine drive working machine which concerns on one Example of this invention. 1 is an external view of an engine-driven work machine according to an embodiment of the present invention. It is a figure which shows the front frame of the engine drive working machine which concerns on one Example of this invention. It is a figure which shows the intake duct of the engine drive working machine which concerns on one Example of this invention. It is a figure which shows the state which attached the intake duct in the front frame. It is the perspective view seen from the front side of the conventional engine drive working machine. It is a figure which shows the intake duct of the conventional engine drive working machine. It is a figure which shows the flow of the air in the exhaust chamber of the conventional engine drive working machine.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a view showing the inside of a wind exhaust chamber of an engine driven working machine according to an embodiment of the present invention, and FIG. 2 is an external view of the engine driven working machine according to an embodiment of the present invention. 1 and 2, reference numerals 1 to 9 correspond to those in FIGS. 6 to 8, 10 is a front frame, 11 and 12 are intake ducts, 13 and 14 are intake outlets, and 15 is a water receiving plate. , 16 is a storage container, 17 is a work machine base, 18 is a radiator cover, 19 is an engine fan, 20 is a muffler, and 21 is an exhaust pipe.

  The exhaust chamber 8 is formed in the front frame 10, and an engine heat exchanger such as a radiator 9 and an intercooler (not shown) is disposed between the exhaust chamber 8 and the engine chamber 7. Yes. In addition, air inlets 2 are provided on the left and right side walls of the front frame 10. Then, by rotating the engine fan 19, outside air is taken in from the air inlet 2 and the rear air inlet 3, and the taken air is flowed into the soundproof case 1 to cool the engine, the engine heat exchanger, and the like. It exhausts from the exhaust port 4. The exhaust muffler 20 of the engine is disposed in the exhaust chamber 8, and the muffler 20 is also cooled by the cooling air passing through the engine heat exchanger.

  The partition wall is provided with intake / exhaust ports 13 and 14 communicating with the engine compartment 7, and the intake ports 2 and 2 and the intake / exhaust ports 13 and 14 are communicated with the intake ducts 11 and 12, respectively.

  FIG. 3 is a view showing a front frame of the engine-driven work machine according to one embodiment of the present invention. The left and right front frame side walls 10a are provided with air inlets 2 and 2, and the top plate portion 10b is provided at the upper end of both front frame side walls 10a. Further, a partition wall 10c is provided on the side of the engine chamber 7 of both front frame side walls 10a, and an opening 10d for disposing the radiator 9 and the like is provided in the partition wall 10c.

  The top plate portion 10b is provided with an upper opening portion 10e serving as an exhaust port 4, and the inner surface of the front frame side wall 10a is provided with stud bolts 10f for attaching the intake ducts 11 and 12, and the upper opening portion 10e At both ends, the top plate portion 10b is bent downward, and bolt holes 10g for fixing the upper end portions of the intake ducts 11 and 12 are provided there. Furthermore, intake discharge ports 13 and 14 for sending outside air sucked from the intake port 2 into the engine compartment 7 are provided on the upper left and right sides of the partition wall 10c.

  The intake ducts 11 and 12 are covered and fixed to the inner surfaces of the front frame side walls 10a on both sides of the front frame 10 so that the intake ports 2 and 2 and the intake and discharge ports 13 and 14 communicate with each other. The intake ducts 11 and 12 have a shape as shown in FIG. FIG. 4 shows a view of one intake duct 11 from the inside and a view from the outside, and the other intake duct 12 has a symmetrical shape.

  A muffler mounting piece 11g and a radiator cover mounting piece 11h are provided on the back surface of the duct back plate 11a of the intake duct 11, and a similar radiator cover mounting piece is also provided on the back surface of the other intake duct 12. . However, there is no muffler attachment piece on the back surface of the other intake duct 12, and an attachment hole (not shown) for fixing the muffler 20 is provided in the duct side plate of the intake duct 12. Then, one side of the muffler 20 and the radiator cover 18 is attached to one intake duct 11 by a muffler attachment piece 11g and a radiator cover attachment piece 11h, respectively, and a radiator cover is attached to the other intake duct 12 by the radiator cover attachment piece. The other side of the muffler 20 is attached by bolting a bracket (not shown) provided on the opposite side of the muffler 20 to the mounting hole.

  The intake duct 11 covers the inner surface of the front frame side wall 10a so that the intake ports 2 and 2 and the intake and discharge ports 13 and 14 communicate with each other, and the upper portion is covered with the top plate portion 10b of the front frame 10, and the front frame side wall 10a. A duct is formed by the inner surface of the duct, the duct back plate 11a, the duct side plate 11b, and the duct bottom plate 11c. And the L-shaped partition plate 11d is provided in the inside so that a flow path may be divided | segmented into plurality in the form which follows the air flow in a duct.

  FIG. 5 shows a state in which an intake duct is attached in the front frame. As shown in FIG. 5, the lower portion of the intake duct 11 is attached to the position of the intake port 2. For mounting, four stud bolts 10f provided on the inner surface of the front frame side wall 10a are aligned with the four bolt holes 11f of the bent piece 11e of the intake duct 11 and fixed with nuts, and the top plate portion 10b is bent. The bolt hole 10g provided and the bolt hole 11f provided at the upper end of the duct back plate 11a of the intake duct 11 are bolted through bolts.

  The reason why the partition plate 11d is provided in the intake duct 11 is that if the partition plate 11d is not provided, the amount of air discharged from the intake discharge port 13 into the engine chamber 7 through the intake duct 11 is increased. This is because a bias occurs between the upper and lower portions of the glass, and the cooling effect decreases. On the other hand, when a partition plate 11d as shown in FIG. 4 is provided in the intake duct 11, the flow of air in the intake duct 11 is divided by the partition plate 11d as shown by a broken line arrow in FIG. Therefore, the bias can be suppressed.

  Further, by changing the height position of the horizontal portion of the partition plate 11d, the upper and lower opening areas of the intake / discharge port 13 can be adjusted, and by changing the height of the lower end of the vertical portion of the partition plate 11d, The intake area above and below the intake port 2 can be adjusted. In this way, the amount of discharge from the top and bottom of the intake discharge port 13 to the engine chamber 7 can be adjusted to an optimum state.

  In addition, it is recommended to attach a sound absorbing material to the inner surfaces of the intake ducts 11 and 12 and the front and back surfaces of the partition plate 11d. By doing so, noise leaking from the engine compartment 7 through the intake ducts 11 and 12 can be kept low.

DESCRIPTION OF SYMBOLS 1 Soundproof case 2, 3 Intake port 4 Exhaust port 5 Door 6 Intake duct 6a Lower duct part 6b Upper duct part 6c Inlet outlet 7 Engine room 8 Exhaust room 9 Radiator 10 Front frame 10a Front frame side wall 10b Top plate part 10c Bulkhead 10d Opening portion 10e Upper opening portion 10f Stud bolt 10g Bolt hole 11, 12 Intake duct 11a Duct back plate 11b Duct side plate 11c Duct bottom plate 11d Partition plate 11e Bending piece 11f Bolt hole 11g Muffler attachment piece 11h Radiator cover attachment piece 13, 14 Intake air Discharge port 15 Water receiving plate 16 Storage container 17 Working machine base 18 Radiator cover 19 Engine fan 20 Muffler 21 Exhaust pipe 22 Hanging bracket

Claims (4)

The interior of the soundproof case is partitioned into an engine room and an exhaust chamber by a partition, and an engine and a work machine body driven by the engine are disposed in the engine room, and heat exchange for the engine is performed in the opening of the partition And an exhaust port is formed in the upper surface portion of the exhaust chamber. Cooling air is taken from the intake port, passed from the engine chamber to the heat exchanger, and then passed through the exhaust chamber. An engine-driven work machine that discharges from the air vent,
An engine driving operation characterized in that the intake port is provided in a side wall of the exhaust chamber, an intake discharge port to the engine chamber is provided in the partition wall, and the intake port and the intake discharge port communicate with each other through an intake duct. Machine.   The engine-driven work machine according to claim 1, wherein the intake duct forms an air flow path between an inner surface of the intake duct and a side wall of the exhaust chamber.   The engine-driven work machine according to claim 1 or 2, wherein a partition plate is provided in the intake duct so as to divide the flow path into a plurality of parts. 4. The engine-driven work machine according to claim 3 , wherein the partition plate is bent into an L shape at an intermediate portion in the air flow direction.

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