JP2007327456A - Engine generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To minimize the whole noise level, while dispensing with site work, by repairing failure in the shape of the replacement including a mounting stage. <P>SOLUTION: An engine 3 mounted on the mounting stage 9 capable of traveling by wheels 31, is formed as a double structure for covering the whole of the front, the rear, and an upper part and both sides of the mounting stage 9 with a muffling case 7, while covering the front, the rear, the upper part and both sides with an engine cover 15 for making a work space for engine work, when opening a part. The engine cover 15 is provided with a cooling air intake port 27 for making cooling air flow inside when rotating a radiator fan 11. The muffling case 7 is provided with an opening-closing door for the work, an opening-closing door 55 for taking in and out the mounting stage, a first central muffling chamber 45, a pair of second muffling chambers 47 longitudinally arranged for communicating with the first central muffling chamber 45, and a pair of front-rear third muffling chambers 49. A pipe 59 having the predetermined length is arranged on a partition wall 57 for partitioning the second muffling chambers 47 and the third muffling chambers 49, to restrict the passing of low frequency noise. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an engine generator that is friendly to a noise environment and that is suitable for use as an emergency power source or an ordinary power source having a relatively large output.

  In general, an engine generator is used as an emergency power source or a regular power source depending on the purpose of use.

  The engine generator is composed of an engine and a generator, and a rotational power from the engine is given to the generator to secure a power supply of a predetermined wattage.

  During operation of an engine generator, a large amount of engine noise is generated from the engine. Therefore, many soundproof type engine generators that suppress the engine noise have been proposed.

The outline of the soundproof type engine generator is a means for suppressing the engine noise leaking outside by surrounding the engine and the whole generator with a soundproof case.
Japanese Patent Laid-Open No. 11-153039

  Engine noise generated from the engine generator ranges from low frequency noise to high frequency noise. When the output increases, the noise increases in proportion to the output. In particular, low-frequency noise of 50 to 500 Hz is difficult to be absorbed by the sound absorbing material stretched inside the soundproof case, and for example, leaks to the outside from a cooling air intake or a ventilation port serving as an exhaust port. Even with the case, it was difficult to keep the overall noise level small.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an engine generator in which the overall noise level leaking to the outside is suppressed to a low level, and operations including ensuring a good engine cooling state and maintenance can be easily performed. It is said.

  In order to achieve the above-mentioned object, in the present invention, a radiator and an engine including a radiator fan in order from the front, a mounting base including wheels on which a generator is mounted, and a wheel on which the engine can run, front, rear, An engine cover that covers the upper and both sides and creates a working space for engine work when a part of it is opened, and is installed on the ground surface that covers the entire front, rear, upper, and both sides of the mounting base including the engine cover. The engine cover has a cooling air inlet through which cooling air flows when the radiator fan rotates, while the silencing case has an opening / closing door for work and an opening / closing door for loading and unloading the mounting base. And provided above the pair of second and second silencing chambers provided in front of and behind the first central silencing chamber and the first central silencing chamber. A predetermined length provided with a plurality of second silencing chambers and a plurality of third silencing chambers provided on the partition wall. It is characterized by communicating through a pipe pipe.

  According to the present invention, the engine cover that directly covers the engine acts as a primary filter for soundproofing, and the engine noise from the engine can be kept small.

  On the other hand, engine noise leaking from the engine cover whose noise energy has been reduced passes through the first central silencer chamber, the second silencer chamber, and the third silencer chamber in this order. It is done.

  In particular, when engine noise passes from the second silencing chamber to the third silencing chamber, the passage of low-frequency noise having a long wavelength can be greatly restricted by a pipe tube having a predetermined length. As a result, it is possible to suppress the leakage of low-frequency noise to the outside, and the overall noise level can be reduced.

  In addition, during operation, the cooling air flows through the engine cover due to the rotation of the radiator fan. Therefore, the engine can be efficiently cooled by the combination of the cooling air and the coolant by the radiator.

  In addition, simple engine repair and inspection work can be performed easily by opening the opening / closing door of the silencer case and creating a work space for engine work in a part of the engine cover. Thus, for example, when a generator or the like stops moving, a new or repaired entire mounting base can be quickly replaced by carrying it to the factory and pulling the mounting base out of the muffler case.

  According to the present invention, in addition to a dual structure in which an engine that is a source of noise is covered with an engine cover and the entire structure including the engine cover is covered with a muffler case, a wheel capable of traveling is provided on the mounting base. By doing so, it is possible to move a heavy mounting base and to make it easy to put in and out using the opening / closing door of the silencer case.

  Hereinafter, embodiments of the present invention will be specifically described with reference to FIGS. 1 to 13.

  FIG. 1 is a schematic explanatory diagram of an entire engine generator according to the present invention.

  The engine generator 1 includes an engine 3 and a generator 5, and a muffler case 7 surrounding the engine 3 and the generator 5, and the engine 3 and the generator 5 are fixedly set on a mounting base 9.

  The engine 3 is disposed at a central portion of the mounting base 9, a radiator 13 having a radiator fan 11 is disposed in front of the engine 3, and a generator 5 is disposed in the rear. The radiator fan 11 and the generator 5 are supplied with rotational power by the output shaft from the engine 3, so that a power source in a predetermined kW unit can be obtained in the generator 5. In the radiator fan 11, the cooling air is sent from the engine 3 side toward the radiator 13, and the cooling air passes through the radiator 13, so that the coolant exchanged in the radiator 13 is exchanged with the engine 3, the radiator. The engine 3 can be cooled by circulating between the three.

  As shown in FIG. 7, the engine 3 is entirely covered with a silencer engine cover 15. The engine cover 15 is formed in a shape that covers the front, rear, upper, and both sides of the engine 3, and it is desirable to use a steel plate having a thickness of 3.2 mm in order to confine noise. Further, the front of the engine cover 15 has a shape surrounding the radiator fan 11 as shown in FIG. 1, and the internal mounting base 9 is exposed by removing the maintenance covers 17a and 17b divided into a plurality of parts. It has become. The maintenance covers 17a and 17b are provided with a handle 19, and a work space for engine work can be created by holding the handle 19 and removing it. The maintenance cover 17a on the upper surface side is fixedly set by dropping into the engagement step portion 20a of the frame 20 as shown in FIG. As shown in FIG. 9, the side surface maintenance cover 17 b is fixedly supported by inserting keyhole-shaped attachment holes 21 provided vertically on the pins 22 on the frame 20 side.

  Further, the engine cover 15 is provided with a cooling air intake 27 at the rear, and guides the cooling air taken in from the cooling air intake 27 toward the engine 3 and the front radiator 13 when the radiator fan 11 rotates. The structure also serves as cooling air guide means.

  The engine 3 is cooled by a combination of cooling by the coolant of the radiator 13 and cooling air flowing in the engine cover 15, but if the cooling capacity is still insufficient, for example, FIG. As shown, it is desirable to provide means for providing an auxiliary fan 29 in the opening hole 25 of the rear cover panel 23 of the engine cover 15.

  As described above, the mounting base 9 has the engine 3 and the generator 5 mounted on the upper surface, but wheels 31 are provided at the front and rear and the left and right, respectively.

  The wheels 31 are provided so that the silencing case 7 can be easily put in and out as shown in FIG. The wheel 31 is movable up and down between a standby position (chain line) raised from the road surface G by the wheel lifting means 33 and an operating position (solid line) lowered from the mounting base 9.

  This is because when the wheel 31 is moved up to the standby position, the mounting base 9 is brought into contact with the road surface G so as to be in contact with the road surface, so that a stable installation state of the mounting base 9 can be ensured. .

  The wheel raising / lowering means 33 is supported by a screw rod 37 that can be rotated forward and backward in a guide tube 35 fixedly supported on the mounting base 9, and the wheel rod 37 moves up and down along the guide tube 35. The guide nut 39 to be engaged is screwed.

  The screw rod 37 is provided with forward and reverse rotational power by manually operating the screw head 41 with a manual tool (not shown).

  On the other hand, the silencing case 7 is used by being installed on the road surface G. As shown in FIG. 6, a control panel 43 for controlling and controlling the engine 3 and the generator 5 set on the mounting base 9 is provided inside. The control panel 43 and the engine 3 and the generator 5 on the mounting base 9 side are electrically connected via a detachable connector (not shown).

  The silencer case 7 is made of a steel plate having a thickness of 3.2 mm from the point of confining noise. As shown in FIGS. 1 and 2, the silencing case 7 includes a first central silencing chamber 45 disposed at the central portion, a pair of front and rear second silencing chambers 47, 47 disposed before and after the first central silencing chamber 45, and It is formed by a pair of front and rear third silencing chambers 49, 49 disposed above the two silencing chambers 47 and has a symmetrical shape. Sound absorbing materials (not shown) are provided on the inner walls of the first, second, and third silencing chambers 45, 47, and 49, and the left and right sides (upper and lower sides of FIG. 2) of the third silencing chamber 49 are shown in FIG. As shown, a pair of ventilating openings 51 and 52 opened downward on both sides through a duct 56 extending from the partition wall 57 of the third silencing chamber 49 are provided. Of the ventilation openings 51 and 52, one (FIG. 2, right) pair of ventilation openings 51 is a cooling air intake, and the other (left side of FIG. 2) pair of ventilation openings 52 is a cooling air outlet. Yes. The reason for providing a pair of ventilating openings 51 and 52 on the left and right is that either one functions normally when affected by a strong wind.

  The silencer case 7 is provided with a kannon-type door 55 for work. As the places where the opening / closing doors 55 are provided, they are provided at least at the four positions on both sides corresponding to the first central silencing chamber 45 and the front and rear corresponding to the second silencing chamber 47. In this embodiment, one of the front and rear opening / closing doors 55 is an opening / closing door for taking in / out the mounting base 9. In this case, as shown in FIG. 4, the lower frame 56 provided with the door 55 for taking in and out can be removed with the volt | bolt 58 and the nut 60 so that it may not become obstructive at the time of putting in / out.

  The second silencing chamber 47 and the third silencing chamber 49 are partitioned by a partition wall 57 having a thickness of 4.5 mm and communicated via a plurality of pipe pipes 59 arranged on the partition wall 57.

  The pipe 59 is set to such a length that the low-frequency noise of 50 to 500 Hz interferes with the wavelength of the low-frequency noise and the passage is greatly limited.

  The silencing case 7 and the mounting base 9 are connected via a hanging metal fitting 61 provided on the silencing case 7 and a telescopic rod 63 extending upward from the mounting base 9.

  The hanging metal fitting 61 has an integral structure that is disposed at four places on the ceiling surface of the first central silencing chamber 45 of the silencing case 7 and connected to the telescopic rod 63.

  The expansion / contraction rod 63 has a turnbuckle 65 for expansion / contraction at an intermediate portion and a mounting bracket 69 at the lower end. As shown in FIG. 12, the mounting bracket 69 is detachably fixed to a bracket 71 having a mounting hole fixedly supported on the mounting base 9 by bolts 73 and nuts 75 (only one is shown). Sometimes it can be separated.

  Therefore, the mute case 7 and the mounting base 9 can be suspended together by hooking and lifting the crane hook 25 on the hanging metal fitting 61, so that loading and unloading operations on trucks and the like can be performed quickly and easily. It can be done.

  According to the engine generator 1 configured as described above, the engine cover 15 that directly covers the engine 3 acts as a primary filter for soundproofing, and suppresses engine noise from the engine 3 to be small.

  On the other hand, since the engine noise leaking from the engine cover 15 in which the noise energy is suppressed passes through the first central silencing chamber 45 and the second silencing chamber 47 and further passes through the third silencing chamber 49 in this order, the long silencing. A further damping effect is obtained by the passage.

  In particular, when low-frequency noise having a long wavelength out of engine noise passes from the second silencing chamber 47 to the third silencing chamber 49, it is greatly restricted by the pipe pipe 59 having a predetermined length. As a result, it is possible to suppress leakage of low-frequency noise to the outside, and to reduce the overall noise level.

  Further, since cooling air flows through the engine cover 15 by the rotation of the radiator fan 11 during operation, an efficient cooling state of the engine 3 can be obtained by a combination of the cooling air and the coolant of the radiator 13.

  In addition, by opening the opening / closing door 55 of the silencer case 7 and creating a work space for engine work in the engine cover 15, it is possible to quickly and easily perform regular engine 3 inspection work.

  In addition, if the generator 5, engine 3, etc. fail after long-term use, the equipment can be transported from the site to the factory, and the mounting base 9 can be taken out of the silencer case 7 so that the mounting base 9 can be quickly replaced with a new one. You can do it.

BRIEF DESCRIPTION OF THE DRAWINGS Outline explanatory drawing of the whole engine generator concerning this invention. FIG. 2 is a schematic explanatory diagram of a mute case as viewed from above. The outline explanatory view which looked at the silence case from back. The schematic explanatory drawing which showed an example of the removal structure of a lower frame. Cross-sectional explanatory drawing of a ventilation opening. The outline explanatory view which looked at the muffling case from the square. The outline explanatory view which looked at the engine cover from diagonally back. FIG. 8 is a sectional view taken along line AA in FIG. 7. Explanatory drawing which showed an example of the attachment state of the side maintenance cover. Outline explanatory drawing which looked at the engine cover set to the mounting base from back. Outline | summary cutting | disconnection explanatory drawing which showed the support state of the wheel. Outline | summary cutting explanatory drawing which showed the attachment state of the expansion-contraction rod lower end part with respect to a mounting base. The general | schematic explanatory drawing of the whole which took out the engine generator from the silencing case.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine generator 3 Engine 5 Generator 7 Silencer case 9 Mounting base 11 Radiator fan 13 Radiator 15 Engine cover 27 Cooling air intake 31 Wheel 45 First central silencer chamber 47 Second silencer chamber 49 Third silencer chamber 55 Opening and closing door 57 Partition wall 59 Pipe pipe

Claims (1)

  A radiator and engine equipped with a radiator fan in order from the front, a mounting base equipped with a wheel on which a generator is mounted, and covers the front, rear, upper and both sides of the engine, and for engine work when part of the engine is open An engine cover for creating a work space; and a muffler case installed on the ground surface covering the entire front, rear, upper, and both sides of the mounting base including the engine cover, the engine cover being the radiator fan While the cooling air intake has a cooling air inlet through which the cooling air flows when rotating, the silencer case has a work opening and closing door and an opening and closing door for loading and unloading the mounting base, and the first central noise reduction chamber in which the mounting base is disposed And a pair of second silencing chambers provided in front of and behind the first central silencing chamber, and opened downwardly and partitioned by a partition wall provided above the second silencing chamber. A pair of front and rear third silencing chambers having an air opening, and the second silencing chamber and the third silencing chamber are communicated with each other through a pipe pipe having a predetermined length provided on the partition wall; A featured engine generator.

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