JP4471766B2 - Engine driven work machine - Google Patents

Description

          The present invention is an engine-driven working machine in which a working machine body such as an engine-driven compressor, a generator, or a welding machine is disposed in a casing, and projects through an opening opened above the outer wall of the casing. The present invention relates to an exhaust pipe cover structure.

          Conventionally, the muffler to which the present invention belongs is arranged inside the casing, and the exhaust method of the muffler exhaust pipe is taken out horizontally or vertically from the top of the casing, and passes through the exhaust pipe. Means for preventing rainwater from entering the inside of the casing is provided in the opening provided in the outer wall of the casing.

          For example, as shown in FIGS. 4 and 5, when the exhaust pipe 75 of the muffler 70 disposed in the exhaust passage 181 of the casing 180 is disposed through the opening in the upper portion of the casing, A mounting base 185 is provided on the upper surface of the housing 180, and the exhaust pipe 75 passing through the hole 185a formed in the center of the mounting base 185 has notches 175a and 176a having the same curvature as the outer diameter of the exhaust pipe. Means for closing the gap between the outer periphery of the exhaust pipe 75 and the hole 185a of the mounting base 185 with iron pressing plates 170 and 171 so as to be pressed from both sides by heat-resistant seal members 175 and 176 and further covered thereon. Has been taken.

          The sealing members 175 and 176 and the holding plates 170 and 171 are fixed by passing holes 170b and 175b with bolts (not shown) and screwing them with screw holes 185b. Further, a pipe flange 75b is formed at the end of the exhaust pipe 75, and a hood 85c is joined to the pipe flange 75b to change the exhaust direction from the vertical direction to the horizontal direction and prevent rainwater from entering the exhaust pipe. The exhaust pipe 85 is provided, and a cover 187 that prevents intrusion of rainwater from above is formed so as to cover the exhaust pipe 85, the exhaust pipe 75, the mounting base 185, and the like.

Further, as shown in FIG. 6, the exhaust pipe 75 is guided through an opening 180a formed in the upper part of the outer wall of the casing 180 so as to guide the exhaust pipe 75 from the muffler 70 disposed in the exhaust passage 181 of the casing 180. Further, in order to fit the exhaust pipe 85 having the hood 85c formed so as to be fitted into the pipe end of the exhaust pipe 75, and to completely connect the exhaust pipe 75 and the exhaust pipe 85, the hood 85c An exhaust pipe structure in which a fastening member 86 is mounted on the outside and fixed by a fixing bolt 87 is employed.

        A cylindrical or box-shaped concave cover 92 opened on the lower side is disposed through the exhaust pipe 75 so as to cover the opening 180a from above the housing 180, and the concave cover 92 is A bolt 93 is screwed to a mounting plate 76 that is fitted and fixed to the exhaust pipe 75.

Also, shown Figure 3 of Patent Document 1 in FIG. 7, the diesel engine 201 is disposed in a cubicle 203 According to該考proposal, the muffler 207 exhaust pipe 201a of the diesel engine 201 via a flange 204 I Further, the silencer 207 is vertically supported so as to guide the exhaust connection pipe 210 to the outside of the cubicle 203 through the flange 204II.

In the portion where the exhaust connection pipe 210 penetrates from the inside of the cubicle 203 to the outside of the cubicle 203, the exhaust pipe through hole 203a having the vibration blocking space S and the cylindrical body 211 rises upward at the edge of the pipe penetration port in a watertight manner. . Further, a cover 212 that covers the cylindrical body 211 with a space therebetween is fitted into the exhaust pipe in the vertical portion of the exhaust connection pipe 210 so as to be directly watertight. For this reason, there is disclosed an idea of a cover 212 and a cylindrical body 211 that prevent the vibration of the diesel engine 201 from being transmitted to the cubicle 203 and prevent raindrops or the like from entering the cubicle 203.
Utility Model Publication Sho-57-20953

        However, in the conventional example shown in FIGS. 4 and 5, the structure is complicated, and when the muffler 70 and the exhaust pipe 75 are swung, the structure cannot absorb vibration. The cover 92 of the conventional example shown in FIG. 6 must be provided with a dedicated mounting plate 76 fitted to the exhaust pipe 75, and the other exhaust pipe attached to the tip of the exhaust pipe 75 is attached to the mounting plate 76. It cannot be diverted to support this, and other support members such as a hood 85c and a fastening member 86 must be provided. In addition, when the muffler 70 swings vigorously, the configuration of the hood 85c, the fastening member 86, and the like may be unsuitable.

        Further, the cover 212 disclosed in FIG. 7 must be fixed in a watertight manner at right angles to the exhaust pipe in the vertical portion of the exhaust connection pipe 210, and since it is exposed to the outside, it is necessary to replace the parts by damage. The exhaust connection pipe 210 and the cover 212 had to be replaced as an assembled product, which was unreasonable. Further, in the disclosed example of the invention, it is not considered that the exhaust connection pipe 210 is easily changed on the user side, and the installation may be limited.

Means to solve the problem

In order to solve the above-described problems, in the present invention, as described in claim 1, at least an engine, a work machine body driven by the engine, and a muffler are disposed in a substantially rectangular parallelepiped housing, the muffler is disposed upon directly or vibration-damping support in the housing, an exhaust pipe of the muffler discharge side, the communication with the atmosphere in the housing top, downward open into exhaust air passage side of the housing portion an opening through vertically made in the periphery of the opening, is erected vertical wall is so as to surround the opening, said exhaust pipe above the end that exceeds the height of the vertical wall, pipe flange, the exhaust pipe end portion from the tube flange upper surface is provided so as to protrude, the tube flange carries a second exhaust pipe with other pipe flanges, before between the two pipe flanges Kitate and concave cover facing down as to the cover wall has a gap between the vertical wall It is set, during operation of the engine-driven work machine, through the opening and the gap, and made to flow into the atmosphere a portion of the exhaust air is upward from the exhaust air passage side, the concave-shaped cover of a substantially central portion a circular hole substantially equal to the pipe flange inner diameter opened et al is, the periphery of the circular hole and the mounting hole is opened in a position to engage the mounting holes of the pipe flanges, The concave cover is characterized in that the circular hole is fitted in the exhaust pipe end protruding from the upper end surface of the pipe flange .

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 pipe flanges are in contact with the concave cover. It is characterized by inserting a gasket.

The invention's effect

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

        The exhaust pipe of the muffler that is arranged in the exhaust passage directly or with anti-vibration support has a pipe flange at the end of the pipe that penetrates the through hole in the upper part of the casing and protrudes outside the casing. Since the second exhaust pipe having the supported pipe flange can be disposed, the second exhaust pipe can be easily changed on the machine installer or user side, and the exhaust pipe end of the muffler can be changed. Another exhaust pipe can be disposed between the pipe flange and the second exhaust pipe. The structure in which the concave cover is sandwiched between the pipe flanges eliminates the need for the concave cover mounting plate and contributes to the provision of an inexpensive machine.

        The exhaust pipe of the muffler passes through an opening formed in the outer wall of the upper part of the housing, and has a concave cover facing downward covering the vertical wall surrounding and surrounding the opening of the housing. Since it is arranged between the pipe flanges, it is possible to prevent rainwater from entering from the outside of the housing to the inside of the housing.

        The downwardly facing concave cover is sandwiched and held between the two flanges, so that it exists as a single component and does not require adjustment or the like for component replacement or attachment. Further, the relationship between the exhaust pipe of the muffler facing upward and the pipe flange disposed at the end and the exhaust pipe of the muffler is that the tip of the exhaust pipe protrudes from the joint surface of the pipe flange by a predetermined length. If the hole at the center of the concave cover is fitted to the exhaust pipe, the center position can be easily set without shifting.

        In addition, even when the muffler is held by a vibration isolating member or the like, the gap between the exhaust pipe of the muffler and the opening for penetrating the exhaust pipe formed in the upper part of the housing Can be set freely to prevent contact by vibration. Further, there is an effect that hot air in the casing can be discharged out of the casing when the engine is stopped from the opening at the top of the casing.

        A muffler is disposed in the exhaust passage, and a part of the exhaust passes through the opening in the upper part of the housing and is released to the atmosphere while cooling the inner surface of the concave cover. The temperature rise can be prevented. Furthermore, by providing a gasket on both sides in the vertical direction of the concave cover sandwiched between both pipe flanges, the heat conduction from the exhaust pipe is further suppressed, and a safer and more durable concave cover is provided. Can do.

BEST MODE FOR CARRYING OUT THE INVENTION

        Examples of the present invention will be described below with reference to FIGS. Before and after coming out in the figure, it is before and after looking at the engine side from the work machine body side.

        1 and 2 are a side view and a perspective view of an engine-driven work machine according to an embodiment of the present invention. The engine-driven work machine 100 includes an upper chamber 110, a lower chamber 120, and a base 130, and has a door 140 on the side wall of the lower chamber 120. On the base, an engine E and a generator G, which is a work machine, are supported by a vibration isolating member (not shown).

A cooling fan F is disposed in front of the engine E. Cooling air is sucked from the rear part of the engine-driven work machine, is sent to the upper chamber 110 after cooling the lower chamber 120, and is supported by a vibration isolating member (not shown). After the muffler 70 is cooled, the muffler 70 is discharged from an exhaust port 111 formed in front of the upper chamber 110. A part of the cooling air in the upper chamber 110 passes through the opening 112 in the upper part of the outer wall of the housing to cool the inner surface of the concave cover 90 and is then released to the atmosphere.

        The exhaust pipe 75 protrudes from the front of the muffler 70 to the upper surface of the upper chamber 110 while passing through the opening 112 opened on the upper surface of the outer wall of the upper chamber 110 while gently bending from the horizontal state to the vertical state. The second exhaust pipe 80 having another pipe flange is carried by this pipe flange. A concave cover 90 is disposed between the pipe flanges so as to cover the opening 112 with the opening facing downward.

        FIG. 3 is a diagram showing details of the concave cover 90 of the present invention, which will be described in detail below. A muffler 70 supported by an anti-vibration member (not shown) is disposed in an exhaust passage formed in the upper chamber 110. Exhaust gas of the muffler 70 is bent gently from a horizontal state to a vertical state by an exhaust pipe 75. The exhaust pipe 75a protrudes above the opening 112 on the upper surface of the outer wall of the upper chamber 110 casing. A pipe flange 75b is fitted and fixed at a position entering the lower side of the figure by a predetermined dimension from the pipe end of the exhaust pipe 75a.

        An upright vertical wall 113 surrounding the entire inner periphery of the opening 112 is formed watertight. There is a predetermined gap between the upright vertical wall 113 and the pipe flange 75b. The inner dimension of the opening 112 is larger than the outer dimension of the pipe flange 75b.

On the pipe flange 75b of the exhaust pipe 75, a gasket 94, a concave cover 90 whose outer periphery is bent downward, a gasket 94, and a second exhaust pipe 80 having a pipe flange 80a at the end are arranged in this order. . The concave cover 90 whose outer periphery is bent downward is disposed so as to cover the upright vertical wall 113 with a space, thereby preventing rainwater from entering from the outside. The pipe flange 80a and the pipe flange 75b are firmly connected by a bolt 160.

The second exhaust pipe 80 includes a pipe 80b having the pipe flange 80a at the pipe end and a hood 80c . The hood 80c prevents rainwater from entering the second exhaust pipe 80.

In the embodiment, the flanges are coupled to both surfaces of the coupling portion of the concave cover 90 bent downward by means of the bolts 160 via the gaskets 94. However, the gaskets 94 can be used even if they are removed. The concave cover 90 is shown in a substantially rectangular shape, but it goes without saying that the effect is not changed even if it is circular. The heat-resistant seal members 175 and 176 are formed by pressure-compression molding into a sheet shape .

FIG. 1 is a side view of an engine-driven work machine showing an embodiment of the present invention. FIG. 2 is a perspective view of an engine-driven work machine showing an embodiment of the present invention. 3 is a detailed view of a concave cover for preventing rainwater 4 shows a conventional rainwater prevention exhaust pipe structure. 5 is a detailed view of FIG. FIG. 6 shows another conventional rainwater prevention exhaust pipe structure. FIG. 7 shows FIG. 3 of Patent Document 1 showing a conventional example.

Explanation of symbols

E engine, G work machine body (generator), F cooling fan 70 muffler, 75, 75a, 85 exhaust pipe 76 mounting plate, 75b, 80 a pipe flange, 80 second exhaust pipe 80b, 85b pipe, 80c hood, 85c hood 86 Tightening member, 87 Fixing bolt, 90, 92 Recessed cover 93 Bolt, 94 Gasket, 100 Engine drive work machine 110 Upper chamber, 111 Vent, 112 Opening 113 Vertical wall, 120 Lower chamber, 130 Base 140 Door 170, 171 Pressure plate 170a, 171a, 175a, 176a Notch 170b, 171b, 175b, 176b Holes 175, 176 Seal member, 180 housing, 180a opening 181 Exhaust passage, 185 mounting base, 185a hole 185b, 185e Screw Hole, 201 diesel engine , 201a exhaust Tube 203 cubicle, 203a exhaust through hole, 207 silencer

Claims (2)

At least an engine, a work machine body driven by the engine, and a muffler are disposed in a substantially rectangular housing, and the muffler is disposed in the housing directly or with anti-vibration support, and the exhaust on the exhaust side of the muffler. tube, wherein in the housing top communicates with the atmosphere, through vertically opening made downward opened to exhaust air passage side of the housing part, around the said opening, so as to surround the opening the vertical wall is erected, the above end exceeds the height of the vertical wall to the exhaust pipe, the pipe flange, the exhaust pipe end portion from the tube flange upper surface is provided so as to protrude, the tube flange carries a second exhaust pipe with other pipe flanges, the gap between the concave cover facing down as to be covered with front Kitate wall between two pipe flanges the vertical wall is arranged with a, during operation of the engine-driven work machine, said opening and said air gap Through it, a part of the exhaust air are allowed to flow into the atmosphere upward from the exhaust air passage side, the pipe flange inner diameter and a circular hole substantially equal to the substantially central portion of the concave-shaped cover is opened et al is, the periphery of the circular hole and the mounting hole is opened in a position to engage the mounting holes of the pipe flanges, concave-shaped cover, the exhaust pipe end protruding from the tube flange upper surface An engine-driven work machine characterized in that the circular hole is fitted and disposed in the part .
  2. The engine-driven work machine according to claim 1, wherein a gasket is inserted in a portion where the both pipe flanges abut against the concave cover.

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