JPH0643475Y2 - Soundproof engine work machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a structure of a soundproof case bottom plate of a soundproof engine working machine in which an engine generator and the like are housed in a soundproof case.

(Prior Art) Cooling the oil pan by opening a cooling air intake on the bottom plate of the soundproof case below the engine oil pan,
A technique for draining the engine oil from the cooling air intake is disclosed in Japanese Utility Model Publication No. 55-18511.

However, in such a configuration, the operating noise of the engine leaks from the cooling air intake to the outside.
As disclosed in Japanese Patent No. 5941 and Japanese Utility Model Laid-Open No. 62-76233, a cooling air suction port or discharge port is provided at a position displaced from a position directly below the oil pan by a predetermined distance, and the suction port or discharge port and the oil pan are provided. A labyrinth-shaped cooling air passage is formed between the lower part and the cooling fan, and cooling air is sucked or discharged along the lower part of the oil pan through this labyrinth-shaped cooling air passage. ing.

(Problems to be solved by the invention) As described above, in the conventional soundproof type engine working machine, on the other hand, in order to facilitate maintenance and maintenance work related to the oil pan portion such as engine oil draining work, the oil pan There is a problem that the soundproof performance is deteriorated by providing an opening on the bottom plate of the soundproof case below, and on the other hand, in order to improve the soundproof performance, if a closed structure with a maze-like cooling air passage below the oil pan is used, the maintenance and There is a problem that the work tends to be large-scale work including partial disassembly of the machine body.

The present invention has been made in consideration of such circumstances, and a soundproof engine capable of cooling the engine oil pan while ensuring soundproof performance and facilitating maintenance and maintenance of the oil pan portion. The purpose is to provide a working machine.

(Means for Solving the Problems) In order to solve the above problems, the present invention forms an opening for oil pan maintenance in a soundproof case bottom plate directly under an oil pan of an engine, and normally attaches or detaches or opens or closes the opening. A structure that introduces outside air from the oil pan into the soundproof case by covering it with a flexible cover and communicating the downstream intake path provided on this cover with the upstream intake path formed on the soundproof case bottom plate. Characterize.

(Operation) Outside air is introduced into the intake passage on the downstream side through the intake passage on the upstream side, enters the soundproof case from the vent toward the oil pan of the engine, and first cools the oil pan.

By removing the lid or opening the lid, the oil pan portion can be serviced and maintained through the opening of the bottom plate.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 is a longitudinal side view of a soundproof engine generator, FIG. 2 is a transverse side view of the same, and FIG. 3 is a sectional view taken along line III-III of FIG.

In the figure, reference numeral 1 is a soundproof engine generator equipped with a generator as a working machine, and a soundproof case 2 of this engine generator 1 includes a bottom plate 3, a front plate 4, a back plate 5, left and right side plates 6 and 6, an upper part. It consists of case 7. Wheels 8 8 for movement are attached to the lower part of the soundproof case 2, and handles 9 9 which are handle portions for movement are attached to the front plate 4 and the rear plate 5.

The interior of the soundproof case 2 is partitioned by a partition plate 10 into a front device housing chamber S1 and a rear air exhaust chamber S2.

The equipment storage room S1 has a radiator in order from the left in FIG.
11, a radiator fan 12, which is a cooling fan, a water-cooled diesel engine 13, a generator 14 connected to the output shaft of the engine 13 is housed and arranged, and a fuel tank is provided above the generator 14.
15 is installed.

A muffler 16 is placed horizontally at the bottom of the exhaust chamber S2.
16 and the exhaust port of the engine 13 are connected to each other by an exhaust connection pipe 17 penetrating the partition plate 10. Exhaust gas connection pipe on the equipment chamber S1 side
17, part of it, for example, using a flexible pipe,
The vibration of the engine 13 is prevented from being transmitted to the partition plate 10 and the muffler 16. The exhaust pipe 18 of the muffler 16 extends upward, and the soundproof case 2 is provided at a substantially central position in the width direction of the upper case 7.
It is open to the outside.

The outer shape of the muffler 16 is an elliptical or oval cylindrical shape in side view, and the muffler 16 is attached with its major axis direction inclined to the side opposite to the radiator fan 12. The muffler 16 is a muffler fixing plate 19, 19 whose lower part is attached to the bottom plate 3 or the partition plate 10.
The muffler 16 is fixedly supported by the back plate 5 and the partition plate 10 with a gap.

An air exhaust port 10a is formed in a portion of the partition plate 10 that faces the cooling fan 12 so as to connect the device storage chamber S1 and the air exhaust chamber S2 (see FIGS. 5 and 6). An air exhaust path S2a extending to the center of the soundproof case along the upper case 7 is formed in the upper part of the air exhaust chamber S2, and the upper case 7 communicates the air exhaust path S2a with the outside of the soundproof case 2. The exhaust port 7a is formed.

In addition, the inner wall surface of the upper case 7 and the exhaust path S2 of the partition plate 10
A sound absorbing material (not shown) is attached to the surface forming a.

The engine 13 and the generator 14 in the equipment accommodating chamber S1 are fixedly supported on the bottom plate 3 via supporting members 20 ... Having vibration damping performance, as shown in FIG.

In order to introduce outside air into the equipment accommodating chamber S1, the bottom plate 3 is provided with 4
Two side intake passages S3 to S6 and bottom intake passages S7, S8 consisting of upstream and downstream sides are provided.

As shown in the perspective view of the bottom plate of FIG. 4, the side intake passages S3 to S6 are provided with inner wall plates 3b and 3b on both sides with the outer wall plate 3a to form a double wall structure, and both ends thereof are provided with intake passage side plates. It is closed by 3c, and is divided into four chambers by providing an intake passage partition plate 3d at approximately the middle portion in the lengthwise direction, and each room is divided into four side intake ports 3e ... and a device accommodating chamber.
It is a structure with ventilation holes 3f to the inside of S1. Side intake 3e
Are formed on the vertical side surface 3g of the outer wall plate 3a facing the wheel 8 and on the horizontal end surface 3h. The side vent holes 3f are formed on the upper surface 3i, the slope 3j and the inner side surface 3k of the inner wall plates 3b, 3b. Further, in each of the side intake passages S3 to S6, the side intakes 3e are on the rear plate 5 side (left side in FIG. 4), and the side intakes 3f are on the front plate 4 side (right side in FIG. 4). It is arranged.

A portion of the outer wall plate 3a facing the oil pan 13a of the engine 13 has an opening 3l, and the opening 3l is covered with a lid 21.

The lid body 21 forms a downstream bottom intake passage S7 in a space defined by an upper plate 21a and a lower plate 21b. One side of the intake passage S7 is an opening 21c for communicating with the upstream bottom intake passage S8, and the other side is closed by a side plate or the like. In addition,
A structure may be adopted in which the other side of the intake passage S7 abuts the central partition plate 3m of the bottom plate 3 to close the other side without the side plate and the like provided with the lid 21 attached to the bottom plate 3. Vents 21d are formed in the upper plate 21a for discharging outside air toward the oil pan 13a. It should be noted that the upper plate 21a is formed with a projecting plate 21e that extends upward within a range where it does not interfere with the oil pan 13a, thereby expanding the cross-sectional area of the intake passage S7.

In this embodiment, the lid 21 is fixed to the bottom plate 3 with bolts, screws, etc. 22. However, the lid 21 may be attached to the bottom plate 3 so as to be openable and closable via a hinge or the like.

The intake passage upper plates 3n, 3 are provided on the rear plate 5 side of the opening 3l of the bottom plate 3.
p is provided to form a bottom intake passage S8 on the upstream side.
The intake port 3q of 8 is opened in the width direction on the end face of the bottom plate 3 on the rear plate 5 side. In addition, in the bottom intake passage S8 on the upstream side, there is a baffle plate.
3r is provided and the intake passage S8 has a maze structure.

A sound absorbing material (not shown) is attached to the inner wall portions of the intake passages S3 to S8.

Next, the flow of the cooling air in the operating state of the engine generator 1 will be described with reference to FIGS. 5 to 7.

FIG. 5 is a side view showing the flow of cooling air.

Outside air enters the bottom intake passage S8 on the upstream side from the intake port 3q, passes through the bottom intake passage S7 on the downstream side while detouring upward by the baffle plate 3r, and is introduced from the vent 21d to the bottom of the oil pan 13a of the engine 13. To be done. The outside air introduced from the ventilation port 21d flows along the engine 13 and is exhausted by the radiator fan 12.
The air flows into the exhaust chamber S2 from 10a, the wind direction is changed upward by the muffler 16, the air is guided to the center side of the soundproof case by the exhaust passage S2a, and the air is exhausted to the outside from the exhaust port 7a.

FIG. 6 is a plan view showing the flow of cooling air.

The outside air sucked from the side intake ports 3e of the side intake passages S3 and S4 is the side communication port 3f located at the substantially central portion of the device accommodating chamber S1.
Is introduced from the side of the engine 13 to cool the engine 13 and flow into the exhaust chamber S2.

The outside air sucked from the side intake ports 3e of the side intake passages S5 and S6 is introduced into the soundproof case 2 from the side communication port 3f of the device housing chamber S1 on the front plate 4 side, and the generator 14, The engine 13 is cooled and flows into the exhaust chamber S2.

FIG. 7 is a partial cross-sectional view showing the flow of cooling air in the lower part of the engine.

Since the communication ports 3f of the side intake passages S3, S4 are provided on the upper surface, the sloped surface, and the inner side surface, respectively, from the bottom of the engine 13 to the engine
Supply fresh air over a wide area across the upper 13 sides.

In addition, in the present embodiment, the plurality of vent holes 3f of the intake passages S3 to S6 are provided.
... and the plurality of vent holes 21d of the downstream side bottom intake passage S7 have a larger opening area toward the downstream side (the one that is farther from the radiator fan 12), so a predetermined amount can be obtained even from the end side ventilation port where the intake passage length is long. The outside air can be supplied.

In addition, each intake passage and exhaust passage have a labyrinth structure with a predetermined length, which prevents the operating noise of the engine and generator from leaking directly outside the soundproof case through these intake passages and exhaust passages. be able to. Also, each intake port 3e ..., 3q
Is provided so as to be displaced inward of the soundproof case 2 from the side plates 6 and 6 and the back plate 5 of the soundproof case 2, so that even if the engine generator 1 is installed so as to be in contact with the wall of the building,
There is no undercooling.

(Effect of the Invention) As described above, the soundproof engine working machine of the present invention is
The bottom plate of the soundproof case is detachably attached or detachably attached to the lid having the downstream intake passage, and the upstream intake passage and the downstream intake passage provided on the bottom plate are connected to each other. The outside air can be supplied to the place closest to. Further, since the intake passage can be lengthened, it is possible to reduce the amount of leakage of the driver such as the engine and the generator to the outside through the intake passage. Further, by removing or opening the lid, maintenance work related to the oil pan portion of the engine can be easily performed.

[Brief description of drawings]

1 is a longitudinal side view of a soundproof engine generator according to the present invention, FIG. 2 is a transverse side view of the same, and FIG. 3 is a III-III of FIG.
A line sectional view, FIG. 4 is an external perspective view of the bottom plate, and FIGS.
The figure is an explanatory view showing the flow of cooling air. In the drawings, 1 is an engine generator, 2 is a soundproof case, and 3 is
Is a bottom plate, 3e and 3q are intake ports, 3l is an opening facing the oil pan of the bottom plate, 7a is an exhaust port, 12 is a cooling fan radiator fan, 13 is an engine, 13a is an oil pan, and 14 is a generator. , 21 is a lid, 21d is a vent for discharging outside air toward the oil pan, S7 is a downstream intake passage, and S8 is an upstream intake passage.

Claims (1)

[Scope of utility model registration request] 1. A soundproof structure in which an engine, a working machine, etc. are housed in a soundproof case, an outside air intake port and a cooling air exhaust port are provided in the soundproof case, and the engine, working machine, etc. are forcibly cooled by a cooling fan. In a type engine working machine, while forming an upstream duct-like intake passage isolated from the soundproof case internal space for introducing outside air into the bottom plate of the soundproof case, the bottom plate has a surface facing the oil pan of the engine. An opening is formed in a portion to be closed, and a lid that covers the opening is attached to the bottom plate in a detachable or openable / closable manner, and with the lid covering the opening, the lid is connected to the upstream intake passage. A soundproof engine working machine characterized in that a downstream duct-like intake passage is formed to communicate with the downstream intake passage, and a ventilation port for discharging outside air toward the oil pan is formed in the downstream intake passage.