JP4421996B2 - Engine driven work machine - Google Patents

Description

  The present invention relates to a heat insulation and sound insulation structure of a high temperature portion of an engine driven work machine in which an engine driven compressor, a generator, a pump, and the like are arranged in a casing, and more specifically, a heat insulation from an engine turbocharger and an exhaust pipe. And soundproof structure.

  In recent years, an engine for driving an engine-driven work machine is required to have a small size and high output, and an engine with a turbocharger is used. The temperature around the turbine housing of the turbocharger becomes high and emits radiant heat to the engine compartment and peripheral equipment, which has an adverse effect. A number of inventions and devices for the periphery of the turbine housing have been disclosed in order to reduce the adverse effects of the radiant heat.

  As an example, for example, FIG. 1 of Patent Document 1 is shown in FIG. According to the present invention, a heat insulating structure 201 is formed to cover the turbocharger 202, and the heat insulating structure 201 includes heat shield plates 203, 204, and 205, and each of the heat shield plates includes two sheets. A structure in which a heat insulating material is filled between opposing metal plates prevents flammable parts, oil and fuel from igniting by reducing radiant heat.

  FIG. 2 of Patent Document 2 is shown in FIG. According to the device, a pair of metal case pieces 251 and 252 having a shape substantially similar to that of the supercharger casing 259 is formed in an annular shape by pressing or the like, and heat insulating material layers 255 and 256 are attached to the inside of the metal case pieces. A heat-insulating protective case for a supercharger is disclosed which is formed and heat-resistant surface hardening agents 257 and 258 are formed on the inner surfaces of the heat insulating material layers 255 and 256.

  The metal case pieces 251 and 252 are annularly formed with locking portions 253 and 254 whose one ends are bent outward. The heat insulating protective case for the supercharger sandwiches the metal case pieces 251 and 252 so as to wrap the supercharger casing 259, and the locking portion 253 and the locking portion 254 are brought into contact with each other to form an annular lock. The parts 253 and 254 are integrated by tightening with bolts or clamps.

  The supercharger can be easily covered because of the structure, and the metal case pieces 251 and 252 can be provided at low cost because they are press-processed products. It is disclosed.

  FIG. 2 of Patent Document 3 is shown in FIG. According to this device, a working machine in which an engine 305 having a turbocharger TC is covered with an engine cover 319 is disclosed. In order to suppress the temperature rise of the engine room 318 due to the turbocharger TC, the exhaust turbo part 312 is surrounded by a heat insulating cover 320 separate from the engine cover 319, and an opening 327 is formed above the heat insulating cover 320. A heat insulating cover 320 having a structure in which 327 protrudes from the engine cover 319 to the outside is disposed.

  The air around the exhaust turbo section 312 that has become hot due to the structure is released into the atmosphere from the opening 327 of the heat insulating cover 320 without leaking into the engine room 318.

In addition to Patent Documents 1, 2, and 3, a jacket formed by wrapping asbestos or rock wool with aluminum foil or the like and wrapping it around the casing of the supercharger with a wire or the like, or formed of a heat insulating material and a heat resistant material. What uses the belt member which can be easily detached | desorbed in the shape is used as a heat insulation protection member for superchargers.
Published Utility Model Gazette 6-73337 Public use Showa 57-129928 Published Utility Model Gazette 2-13142

  However, the conventional example shown in FIG. 4 is effective in reducing the radiant heat of the turbocharger 202, but the high temperature part of the engine is in the entire exhaust system including the turbocharger 202, and the structure alone is insufficient. There are many things. In addition, when noise reduction is taken into consideration, noise emitted from the turbocharger 202 is reduced in this structure, but an exhaust pipe from the turbocharger 202 to a muffler (not shown) is not taken into consideration, so that a quieter working machine It is not enough when providing.

  In addition, the conventional example shown in FIG. 5 discloses a heat insulating protective case for a supercharger that includes only the supercharger casing 259, but as described above, it is effective for heat insulation and sound absorption of the supercharger casing 259. Tube insulation and sound absorption are not considered.

  In many engine-driven work machines, an engine and a work machine main body driven by the engine are disposed in a housing via a vibration isolation member. The part of the engine surface that becomes particularly hot is the turbocharger part and the exhaust pipe part of the exhaust gas of the engine, and the engine supported by vibration isolation has a bellows-like flexible pipe formed of a thin metal. The side and the muffler provided on the housing side are connected.

  Since the surface area of the bellows-like flexible tube formed of the thin metal is larger than that of the cylindrical steel tube, heat radiation and sound radiation from the flexible tube are large, and a quiet working machine is provided. If this is taken into consideration, the conventional examples of Patent Documents 1 and 2 cannot be achieved. In addition, the bellows-like flexible tube formed of the thin metal has a weakness compared to other steel pipes and may cause problems, and therefore, safety must be taken into consideration. Further, the exhaust pipe including the turbocharger and the flexible pipe is long in the high temperature even after the engine is stopped, and there is a demand for safety to eliminate the exposed portion.

Means to solve the problem

  In order to solve the above-described problems, in the present invention, as described in claim 1, an engine and a work machine body driven by the engine are disposed in the casing, and the casing includes at least the engine. An engine-driven work machine that is partitioned into an engine room that houses a work machine body driven by an engine and a muffler room that contains a muffler that silences exhaust gas of the engine, and the engine is provided with a turbocharger. The turbocharger mounted on the upper part of the engine and the exhaust pipe part in the engine chamber of the exhaust pipe connecting the muffler from the turbocharger are formed so as to cover the engine from above, and the lower end is the engine An enveloping cover that is open in communication with the upper surface and whose lower end surface is spaced along the engine surface is disposed.

  In order to solve the above-described problems, according to the present invention, as described in claim 2, the engine-driven work machine according to claim 1, wherein the surrounding cover is suspended from the ceiling surface of the engine compartment. , And can be disassembled into at least two members that are detachable.

  In order to solve the above-mentioned problems, according to the present invention, as described in claim 3, the engine-driven working machine according to claim 1, wherein the exhaust disposed at least inside the enclosure cover is provided. The entire surface of the tube portion is covered with a flexible heat insulating member having sound absorption characteristics.

  In order to solve the above-described problems, in the present invention, as described in claim 4, the engine-driven work machine according to claims 1 to 3, wherein a sound absorbing characteristic is provided on the inner surface of the surrounding cover. The provided heat insulating material is disposed.

  In order to solve the above-described problems, according to the present invention, as described in claim 5, the engine-driven work machine according to claims 1 to 4, wherein at least the ceiling surface of the inner surface of the surrounding cover is provided. The temperature detecting means is disposed in

The invention's effect

  The present invention has the following effects by being configured as described above.

  By providing a surrounding cover that has a shape that covers the turbocharger and the exhaust pipe portion in the engine chamber of the exhaust pipe that connects the muffler from the turbocharger from above, and the lower side is open. The radiant heat to the equipment disposed in the engine room can be shielded. Further, since the heat insulating material having sound absorbing characteristics is disposed on the inner wall surface of the surrounding cover, it has a sound absorbing effect while having a heat insulating effect, and therefore has an effect of reducing the sound pressure in the engine compartment. Moreover, since the high temperature part is covered with the surrounding cover, it is safe because it has a structure that cannot be easily touched from the outside.

  Since the surrounding cover has a structure that can be divided into at least two parts, it can be easily detached. Because of this structure, even if a cover that covers the top of the engine is provided, it can be removed as needed during maintenance inspection.

  Since at least the entire surface of the exhaust pipe portion disposed inside the enveloping cover is covered with a soft heat insulating member having sound absorption characteristics, the flexibility is improved even if the exhaust pipe portion is formed of a flexible pipe. It can be used without damage, and it can suppress sufficient heat insulation and sound emission from inside the exhaust pipe.

  Since the temperature detection means is disposed on the ceiling surface inside the enclosure type cover above the engine, even if the exhaust pipe system including the turbocharger malfunctions and the exhaust gas begins to leak, the high temperature exhaust gas Can be detected at an early stage of being discharged into the enclosure-type cover, and can cope with unforeseen circumstances, a safer work machine can be provided and the work machine can be operated even without an operator.

BEST MODE FOR CARRYING OUT THE INVENTION

  Examples of the present invention will be described below with reference to FIGS. As an embodiment, a description will be given of a soundproof engine-driven work machine using a work machine body as a generator.

  FIG. 1 is a side view showing the periphery of a turbocharger inside the soundproof type engine driven working machine 100, and FIG. 2 is a side view showing the whole of the soundproof type engine driven work machine 100, which will be attached to FIGS. Will be described in detail. The soundproof type engine working machine 100 is formed by a base 150 which is a basic frame, a lower casing 112 and an upper casing 110.

  Inside the lower housing 112, an engine chamber is formed in which the engine 50 and a work machine main body 90 driven by the engine 50 are disposed on the base 150 via a vibration isolation member (not shown). An intake duct 120 is disposed on the left wall surface of the upper casing 110 in the figure, and an air exhaust duct 130 is disposed on the right wall surface in the figure. A muffler 95 is accommodated in the center of the upper casing 110 in the figure. It has a muffler chamber.

  Covers 51, 52, and 53 that cover an exhaust manifold (not shown) are disposed on an upper side wall of the engine 50 that is disposed in the engine chamber, and engage with an outlet of the exhaust manifold so as to engage with the turbine of the turbocharger. A high-temperature exhaust gas in which a housing 54 is disposed and an exhaust turbine (not shown) inside the turbine housing 54 is operated passes through the exhaust pipes 55 and 57 and passes through the metal flexible pipe 58 to form the upper casing. The exhaust gas is introduced into a muffler 95 disposed in a muffler chamber in 110, and after exhaust gas is silenced, it is released to the atmosphere. In addition, a communication port 115a is opened at a portion where the flexible tube 58 communicates between the muffler chamber and the engine chamber, and a gap between the communication port and the flexible tube 58 is suppressed to reduce the flow of wind and sound. A cover 59 for interrupting transmission is provided, contributing to low noise.

  An intake housing 63 containing a turbo blower (not shown) linked to the exhaust turbine is disposed on the left side of the turbine housing 54 in the drawing. An intake pipe 61 is fitted and connected to the intake intake of the intake housing 63 and extends horizontally, and a plurality of air cleaners 60 are disposed on the side of the intake pipe 61. Air necessary for combustion sucked from the air cleaner 60 is pressurized by a turbo blower in the intake housing 63 and supplied to the engine 50 through a cooling device (not shown).

  The turbine housing 54 and the exhaust pipe 55 that have reached a high temperature due to the exhaust gas are covered with a heat insulating jacket 56 formed of a flexible heat insulating member to reduce heat radiation and sound emission to the outside. . Further, the exhaust pipe 57 is covered with a heat insulating member woven from a heat-resistant fiber (not shown), and the flexible pipe 58 formed in a bellows shape with the thin metal pipe has a sound absorption for suppressing emission of heat radiation and sound. A heat insulating member having characteristics wraps and covers so as not to impair the flexibility of the flexible tube 58.

  Inside the flexible tube 58 formed in a bellows shape with the thin metal tube, exhaust gas containing particularly loud noise among engine noises flows at a high speed, so noise is emitted from the bellows-like flexible tube 58 part. Is done. For this reason, in order to reduce the flow rate of the exhaust gas, the exhaust pipe 57 has a taper shape on the upper side in the figure, and the cross-sectional area is increased.

  As described above, the exhaust pipe portion that is at a high temperature is wrapped with a heat insulating member having a sound absorbing characteristic, and the outside is further covered with a surrounding cover 70, and the surrounding cover 70 is composed of the engine chamber and the upper housing 110. The lower end of the enclosure-type cover 70 is formed so as to be spaced apart from the lower end of the surrounding cover 70 along the surface of the upper end portion of the engine 50, It is divided into four so that it can be easily disassembled.

  A heat insulating member having a sound absorption characteristic is disposed on the inner wall surface of the surrounding cover 70 to reduce noise emitted from the turbocharger portion, the exhaust pipe 57, the flexible pipe 58, and the like inside the surrounding cover 70, and the engine. It is formed so as not to diffuse into the chamber. Further, the cooling fan 62 cools the engine compartment in the engine compartment, so that heat does not accumulate inside the surrounding cover 70 opened at the lower side. Further, temperature detecting means 80 is disposed on the ceiling surface in the surrounding cover 70 to monitor an abnormal temperature rise in the surrounding cover 70.

  FIG. 3 is a cross-sectional view taken along the line AA of FIG. 1 and will be described in detail below. The lower end of the enveloping cover 70 detachably suspended below the partition wall 115 formed between the engine chamber and the upper housing 110 is the unevenness of each component disposed on the upper part of the engine 50. The wall surface of the surrounding cover 70 is notched so as to have a predetermined gap.

  The encircling cover 70 is suspended from the partition wall 115 by a bolt 82, and is formed by the turbocharger portion and four wall surfaces 70a, 70b, 70c, 70d surrounding the exhaust pipe 57 and the flexible pipe 58, The wall surfaces are detachably fixed to each other by bolts 82. The temperature detecting means 80 is disposed in the surrounding cover 70 at a position away from the upper side of the turbine housing 54 to the left side in the figure.

  The exhaust original sound discharged by operating an exhaust turbine (not shown) inside the turbine housing 54 is larger than the noise energy emitted from the side wall of the engine body, and reducing the noise emitted from the exhaust pipe This is an effective means for a soundproof type engine driven working machine. In the case of a thick steel pipe, the energy transmitted to the outside is attenuated by transmission loss, but the noise energy much larger than the noise emitted from the engine side wall surface is formed from the flexible pipe 58 formed in the bellows shape by the thin metal pipe. Has been released. For this reason, the flexible tube 58 is covered with a heat insulating material having a sound absorbing characteristic, the outside of the flexible tube 58 is surrounded by the surrounding cover 70, and a heat insulating material having a sound absorbing effect is disposed on the inner side wall. Contributes to noise reduction.

  The flexible pipe 58 formed in a bellows shape with the thin metal pipe uses a so-called flexible pipe in which a thin stainless steel pipe is bellows-like, and the heat insulating material having a sound absorbing effect is, for example, a plate shape. Glass wool, rock wool, etc. are used. The surrounding cover 70 may have any shape as long as it surrounds the exhaust pipe including the flexible pipe 58 extending from the turbocharger portion of the engine 50 to the muffler 95 so as to surround the upper portion of the engine.

  In order to further improve the heat insulation and sound absorbing performance of the surrounding cover 70, the upper part of the engine is covered deeper from the upper side to the lower side, and the number of divisions of the inspection door and the surrounding cover 70 is increased at necessary places, By making the structure where necessary parts can be easily disassembled, the effect can be improved while maintaining the ease of maintenance and inspection.

Side view showing the inside of a soundproof engine-driven work machine Side view of a soundproof engine-driven work machine AA sectional view of FIG. Thermal insulation structure covering turbocharger showing one example of conventional example Sectional drawing of the heat insulation protection case for superchargers which shows an example of a prior art example Exhaust turbo part insulation cover showing an example of a conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 50 Engine 51,52,53 Cover 54 Turbine housing 55,57 Exhaust pipe 56 Thermal insulation jacket 58 Flexible pipe 60 Air cleaner 62 Cooling fan 63 Intake housing 70 Enclosed cover 80 Temperature detection means 90 Work machine main body (generator)
95 Muffler 96 Heat exchanger 100 Soundproof engine drive working machine 110 Upper housing 112 Lower housing 115 Bulkhead 141 Door 150 Base 201 Thermal insulation structure 202 Turbocharger 203,204,205 Heat shield plate 251 252 Metal case piece 255 256 Heat insulation layer 257,258 Heat resistant surface hardener 259 Supercharger casing 312 Exhaust turbo part 319 Engine cover 320 Thermal insulation cover TC Turbocharger

Claims (5)

  An engine and a work machine body driven by the engine are disposed in the housing, and the housing includes at least an engine chamber that houses the engine and the work machine body driven by the engine, and a muffler that silences exhaust gas of the engine. An engine-driven work machine partitioned into a housed muffler chamber and provided with a turbocharger in the engine, wherein the turbocharger mounted on the engine is connected to the muffler from the turbocharger. An exhaust pipe portion in the engine chamber of the exhaust pipe is formed so as to cover from above, and a lower end is opened so as to communicate with the upper surface of the engine, and the lower end surface is provided with a surrounding cover separated along the engine surface. An engine-driven work machine characterized by having.   The engine-driven work machine according to claim 1, wherein the surrounding cover is suspended from the engine room ceiling surface and is formed to be detachable into at least two members. Machine.   2. The engine-driven work machine according to claim 1, wherein at least a surface of the exhaust pipe portion disposed inside the enclosure-type cover is covered with a flexible heat insulating member having a sound absorbing characteristic as a whole. Engine driven work machine.   4. The engine-driven work machine according to claim 1, wherein a heat insulating material having a sound absorption characteristic is disposed on the inner surface of the surrounding cover.   5. The engine-driven work machine according to claim 1, wherein temperature detecting means is disposed at least on a ceiling surface of the inner surface of the surrounding cover.

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