JP7112307B2 - engine generator - Google Patents

Description

The present invention relates to a packaged engine generator. More specifically, it relates to the construction of an exhaust hood for an engine generator.

Conventionally, there has been known a configuration in which an engine generator is provided with an exhaust hood. Patent Literature 1 discloses this type of engine generator.

In the package housed engine generator of Patent Document 1, the package surface provided with the exhaust port is covered with a hood, and inside the hood, a sound absorbing member is provided in the middle of the exhaust passage from the exhaust port to the hood exhaust port formed in the hood. It is configured to be provided.

JP 2014-126033 A

In recent years, as engine generators have become smaller, radiators have become smaller. In order to maintain cooling performance equivalent to that of conventional radiators even if a small radiator is used, it is necessary to increase the amount of exhaust air. Therefore, it is necessary to increase the number of revolutions of the cooling fan, which increases the noise generated. In this regard, the configuration of Patent Document 1 has a limited sound insulation effect when applied to an engine generator, leaving room for improvement.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an engine generator having an excellent sound insulation effect.

Means and Effects for Solving Problems

The problems to be solved by the present invention are as described above. Next, the means for solving the problems and the effects thereof will be described.

According to the aspect of the present invention, an engine generator having the following configuration is provided. That is, this engine generator includes a package that houses the engine and the generator, and an exhaust hood that discharges the air introduced into the package to the outside. The package is formed with an air outlet for discharging the air in the package to the exhaust hood. The exhaust hood includes a first partition wall and a second partition wall arranged in its internal space. The second partition wall is located farther from the package than the first partition wall. The first partition wall and the second partition wall are arranged so as not to overlap when viewed in the vertical direction. The first partition wall is provided so as to face the air outlet. An exhaust path through which air flows is formed between the first end of the first partition wall and the inner wall surface of the exhaust hood. An exhaust path through which air flows is formed between a second end of the first partition wall opposite to the first end and an inner wall surface of the exhaust hood.

Thus, by providing two partition walls so as to separate the internal space of the exhaust hood, the sound insulation effect of the exhaust hood is improved against the noise generated inside the package and propagated from the air exhaust port. can be done.

It is preferable that the above engine generator has the following configuration. That is, the first end is the upper end of the first partition wall. The second end is the lower end of the first partition wall.

As a result, the path of the noise propagating along the exhaust path from the air outlet of the engine generator diverges in the vertical direction and detours. Therefore, noise can be effectively reduced by effectively utilizing the vertical length of the exhaust hood.

1 is a front view showing the configuration of an engine generator according to one embodiment of the present invention; FIG. The perspective view which shows the structure of an engine generator. FIG. 3 is a sectional view of the AA section of FIG. 2 viewed in the direction of the arrow; The perspective view which looked at the AA cross section of FIG. 2 in the direction of the arrow.

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing the configuration of an engine generator 100 according to one embodiment of the present invention. FIG. 2 is a perspective view showing the configuration of the engine generator 100. As shown in FIG.

The engine generator 100 shown in FIGS. 1 and 2 drives the generator with an internal combustion engine to supply electric power. The engine generator 100 is installed via the installation base 1 .

The engine generator 100 includes a package 2, an engine 3, a generator 4, an intake hood 5, an exhaust hood 6, and an exhaust silencer 7, as shown in FIG.

The package 2 is formed in the shape of a hollow rectangular parallelepiped made of a metal plate-like member. The internal space of the package 2 accommodates devices such as an engine 3 and a generator 4 . The package 2 protects the equipment such as the engine 3 and the generator 4 housed therein from rain, mud, shocks, and the like.

On the inner wall surface of the package 2, for example, a sound absorbing sheet made of a sound absorbing material such as organic porous material or inorganic fiber may be attached. As a result, the sound insulation effect of the package 2 can be enhanced, and the noise caused by the operation of the internal engine 3, generator 4, etc. can be reduced.

The engine 3 and the generator 4 are horizontally arranged side by side as shown in FIG. Although a plan view of the engine generator 100 is omitted, the engine generator 100 is elongated in the direction in which the engine 3 and the generator 4 are arranged in a plan view. The package 2 is formed to be an elongated rectangle in a plan view, and its longitudinal direction coincides with the longitudinal direction of the engine generator 100 .

In the following description, the terms “longitudinal direction” and “lateral direction” of the engine generator 100 or the package 2 refer to the longitudinal direction and the lateral direction in a plan view unless otherwise specified. FIG. 2 shows the longitudinal direction and the transverse direction, respectively.

As shown in FIG. 2, the package 2 is formed with an air inlet 23 and an air outlet (package air outlet) 24 .

The air inlet 23 introduces air (cooling air) into the internal space of the package 2 . The air inlet 23 is formed in the upper portion of the first end surface 21 located on one side of the package 2 in the longitudinal direction.

The air discharge port 24 discharges the cooling air introduced into the internal space of the package 2 to the outside. The air discharge port 24 is formed slightly below the center of the second end face 22 located on the other longitudinal side of the package 2 .

In the internal space of the package 2, cooling air flows through the generator 4 and the engine 3 in this order. That is, the generator 4 is provided on the side close to the first end face 21 where the air inlet 23 is formed, and the engine 3 is provided on the side close to the second end face 22 where the air discharge port 24 is formed. ing.

The engine 3 is composed of, for example, a diesel engine, and functions as a prime mover of the engine generator 100 . Note that the engine 3 may be composed of, for example, a gasoline engine or a gas engine instead of a diesel engine.

The engine 3 includes an engine body 30 as shown in FIG. The engine main body 30 burns fuel in a combustion chamber partitioned by cylinders, pistons, etc. to reciprocate the pistons and drive the generator 4 . Exhaust gas generated by burning fuel is discharged to the outside of the package 2 through an exhaust silencer 7 or the like provided on the upper portion of the package 2 .

The engine 3 includes an engine body 30 , a radiator 31 and a cooling fan 32 . As shown in FIG. 1 , the radiator 31 and the cooling fan 32 are provided closer to the second end face 22 of the package 2 than the engine body 30 is.

The radiator 31 is configured as a cooling water radiator, and is provided on the opposite side of the engine body 30 with the cooling fan 32 interposed therebetween. In other words, the radiator 31 is provided downstream of the cooling fan 32 in the direction in which the cooling air flows. The radiator 31 is arranged to face the air discharge port 24 formed in the second end surface 22 of the package 2 .

The cooling water circulates between an engine jacket (not shown) formed in the engine body 30 and the radiator 31 . The radiator 31 cools the engine body 30 by exchanging heat between cooling water and cooling air passing through the radiator 31 .

Cooling fan 32 is provided between engine body 30 and radiator 31 . Cooling fan 32 is driven by power from engine 3 . Cooling air introduced into the inner space of the package 2 through the intake hood 5 and the air inlet 23 by the rotation of the cooling fan 32 cools the generator 4 and the engine 3, and then passes through the cooling fan 32 and the radiator 31. Then, it is sent to the exhaust hood 6 through the air outlet 24 .

The generator 4 is provided on the side opposite to the cooling fan 32 with the engine body 30 interposed therebetween, as shown in FIG. The generator 4 generates electric power from the driving force supplied from the engine 3 . The generator 4 of this embodiment is configured as a known synchronous motor, and generates electric power with a rated frequency of 50 Hz or 60 Hz. Correspondingly, the rated speed of the engine 3 is set to 1500 min ^-1 or 1800 min ^-1 .

The intake hood 5 is attached to the first end face 21 of the package 2 so as to cover the air inlet 23 of the package 2 . Inside the intake hood 5, a path for introducing air from the outside of the package 2 into the internal space of the package 2 is formed.

The exhaust hood 6 is attached to the second end face 22 of the package 2 so as to cover the air outlet 24 of the package 2 . Inside the exhaust hood 6 , a path is formed for discharging the air that has passed through the internal space of the package 2 to the outside of the package 2 .

Cooling air for cooling the equipment such as the generator 4 and the engine 3 housed in the internal space of the package 2 will be described below in order with reference to FIG. The flow of this cooling air is indicated by white arrows in FIG.

Air outside the package 2 is introduced into the internal space from one longitudinal end (air inlet 23 ) of the package 2 via the intake hood 5 . The air introduced into the package 2 flows along the longitudinal direction of the package 2 from the air inlet 23 toward the air outlet 24 by the rotation of the cooling fan 32 . After that, the air is sent to the exhaust hood 6 from the other longitudinal end (the air outlet 24) of the package 2 and is discharged to the outside.

In this way, the equipment inside the package 2 is cooled while the air flows through the intake hood 5, the package 2, and the exhaust hood 6 in this order. Specifically, the generator 4 and the engine 3 are cooled by the wind flowing around the generator 4 and the engine 3 . In addition, the air passing through the radiator 31 can lower the temperature of the cooling water flowing through the engine body 30 .

The exhaust silencer 7 is provided outside (above) the package 2 . The exhaust silencer 7 reduces exhaust noise generated when the exhaust gas is discharged to the outside by a sound absorbing structure formed inside. Note that the exhaust silencer 7 can be omitted.

An exhaust outlet pipe 70 is attached to the end of the exhaust silencer 7 on the downstream side in the direction in which the exhaust gas flows. The exhaust outlet pipe 70 guides the exhaust gas that has passed through the exhaust silencer 7 to be discharged to the outside.

Next, the structure of the exhaust hood 6 of this embodiment will be described in detail with reference to FIGS. 2 to 4. FIG. FIG. 3 is a sectional view of the AA section of FIG. 2 viewed in the direction of the arrow. FIG. 4 is a perspective view of the AA section of FIG. 2 viewed in the direction of the arrow.

As shown in FIG. 2 , the exhaust hood 6 has a first noise reduction chamber 8 and a second noise reduction chamber 9 arranged side by side in the longitudinal direction of the engine generator 100 .

The first silencer chamber 8 is formed in the shape of a rectangular parallelepiped hollow box. A large portion of one side surface (a second wall 82 to be described later) of the first noise reduction chamber 8 is open. The first silencer chamber 8 is attached to the second end surface 22 of the package 2 so that the open portion is closed by the second end surface 22 of the package 2, as shown in FIG. An air outlet 24 formed in the second end face 22 is connected to the inner space of the first silencer chamber 8 .

The first muffling chamber 8 includes a first wall 81, a second wall 82, a third wall 83, a fourth wall (second partition wall) 84, a fifth wall 85, a sixth wall 86, and a partition A wall (first partition wall) 87 is provided. The first wall 81, the second wall 82, the third wall 83, the fourth wall 84, the fifth wall 85, the sixth wall 86, and the partition wall 87 are all made of metal plate members.

The first wall 81 is provided with its thickness direction facing the lateral direction of the engine generator 100 . In the longitudinal direction of the engine generator 100, the first wall 81 is vertically connected to the second wall 82 at one end and vertically connected to the fourth wall 84 at the other end. The first wall 81 vertically connects with the fifth wall 85 at its upper end and vertically connects with the sixth wall 86 at its lower end.

The second wall 82 is provided with its thickness direction facing the longitudinal direction of the engine generator 100 . In the transverse direction of the engine generator 100, the second wall 82 is vertically connected to the first wall 81 at one end and vertically connected to the third wall 83 at the other end. The second wall 82 is vertically connected to the fifth wall 85 at its upper end. A lower portion of the second wall 82 is connected to an upper portion of the second end face 22 of the package 2 . The second wall 82 is formed short in the vertical direction so as not to block the air discharge port 24 formed in the second end surface 22 .

The third wall 83 is provided parallel to the first wall 81 . In the longitudinal direction of the engine generator 100, the third wall 83 vertically connects with the second wall 82 at one end and vertically connects with the fourth wall 84 at the other end. The third wall 83 vertically connects with the fifth wall 85 at its upper end and vertically connects with the sixth wall 86 at its lower end.

The fourth wall 84 is provided parallel to the second wall 82 . In the transverse direction of the engine generator 100, the fourth wall 84 is vertically connected to the first wall 81 at one end and vertically connected to the third wall 83 at the other end. The fourth wall 84 vertically connects with the fifth wall 85 at its upper end and vertically connects with the sixth wall 86 at its lower end.

As shown in FIG. 2, an opening 88 is formed in the fourth wall 84 . The opening 88 is formed in the upper portion of the fourth wall 84 and connects the air discharge path in the first noise reduction chamber 8 and the air discharge path in the second noise reduction chamber 9 . The cooling air that has passed through the first silencer chamber 8 is introduced into the second silencer chamber 9 through the opening 88 .

The fifth wall 85 is above the first wall 81, the second wall 82, the third wall 83, and the fourth wall 84 and connects to each of the four walls.

The sixth wall 86 is connected to each of the first wall 81, the third wall 83, and the fourth wall 84 below the three walls.

In this way, by connecting the adjacent ones of the six walls to each other, the first sound deadening space S1 for the cooling air is formed as an internal space in the first sound deadening chamber 8 .

A sound absorbing sheet 10 made of a sound absorbing material such as an organic porous material or inorganic fiber is attached to each wall of the first sound deadening space S1. Thereby, noise can be reduced.

For example, as shown in FIG. 4, the sound absorbing sheet 10 is fixed to each wall by fitting it into a groove of a strip member 11 having a U-shaped cross section attached to each wall. However, it is not limited to this, and may be fixed to each wall by other methods such as pasting with an adhesive.

The partition wall 87 is provided between the second wall 82 and the fourth wall 84 so as to be parallel to the second wall 82 and the fourth wall 84 . In the lateral direction of the engine generator 100, the partition wall 87 is vertically connected to the first wall 81 at one end and vertically connected to the third wall 83 at the other end.

A sound absorbing sheet 10 is also fixed to the partition wall 87 . The sound absorbing sheet 10 may be arranged on both sides of the partition wall 87 in the thickness direction, or may be arranged only on one side (for example, the side facing the air discharge port 24).

The partition wall 87 attached as described above divides the first silencer space S1 into two in the longitudinal direction of the engine generator 100 . Thereby, noise from the package 2 can be blocked by the partition wall 87, and a transmission loss can be generated. Thereby, the sound insulation effect in the longitudinal direction of the engine generator 100 can be improved.

As shown in FIG. 3, in the height direction of the engine generator 100, the partition wall 87 is formed to be shorter than the length of the first sound deadening space S1 in the vertical direction. are set apart. As a result, an air discharge path is formed between the upper end (vertical end) E1 of the partition wall 87 and the inner wall surface of the fifth wall 85, and the lower end (vertical end) E2 of the partition wall 87 and the fifth wall 85 are formed. An air exhaust path is also formed between the wall 6 and the inner wall surface of the wall 86 . The upper end E1 of the partition wall 87 corresponds to the first end, and the lower end E2 corresponds to the second end.

The distance (first distance) L1 between the upper end E1 of the partition wall 87 and the inner wall surface of the fifth wall 85 is the distance (second distance) between the lower end E2 of the partition wall 87 and the inner wall surface of the sixth wall 86. ) less than L2 (L1<L2). That is, the partition wall 87 is provided at a position closer to the fifth wall 85 than the sixth wall 86 is. In this embodiment, the distance L1 between the upper end E1 of the partition wall 87 and the inner wall surface of the fifth wall 85 is approximately the distance L2 between the lower end E2 of the partition wall 87 and the inner wall surface of the sixth wall 86. one-half (L1=L2/2).

Also, the total length of the distance L1 between the upper end E1 of the partition wall 87 and the inner wall surface of the fifth wall 85 and the distance L2 between the lower end E2 of the partition wall 87 and the inner wall surface of the sixth wall 86 The length is substantially the same as the vertical length L3 of the air outlet 24 (L1+L2=L3). As a result, it is possible to avoid the occurrence of pressure loss due to narrowing of the path, and to smoothly discharge the cooling air. However, the sum of the first distance L1 and the second distance L2 may be greater than the vertical length L3 of the air outlet 24 (L1+L2>L3).

The partition wall 87 is attached so as to form a gap with respect to the fifth wall 85 and the sixth wall 86 while being connected to the first wall 81 and the third wall 83 . This makes it easy to attach the partition wall 87 to the surrounding members (specifically, the first wall 81 and the third wall 83) with a horizontally oriented attachment member (for example, a bolt). Therefore, it is possible to improve the ease of assembly.

The partition wall 87 is provided so as to face almost the entire air discharge port 24 . In other words, the upper end E1 of the partition wall 87 is located above the upper end E3 of the air discharge port 24, and the lower end E2 of the partition wall 87 is located below the lower end E4 of the air discharge port 24. As a result, the cooling air discharged from the air discharge port 24 hits the partition wall 87 and is branched upward and downward in a well-balanced manner as indicated by the white arrows in FIG. In addition, by arranging the partition wall 87 in this way, the noise propagating outward in the horizontal direction from the air discharge port 24 can be effectively blocked by the partition wall 87 .

The cooling air branched upward flows through the path r1 shown in FIG. It is led to the second noise reduction chamber 9 through the. The cooling air branched downward flows through the path r2 shown in FIG. is led to the second noise reduction chamber 9 via. Note that the lengths of the routes r1 and r2 are substantially the same.

As shown in FIGS. 2 and 3, the air outlet 24 is arranged to face the lower portion of the first silencer chamber 8 . This realizes a layout in which the cooling air introduced through the air outlet 24 in the lower portion of the first noise reduction chamber 8 flows toward the opening 88 in the upper portion of the first noise reduction chamber 8 . This means that the noise propagated from the air discharge port 24 to the first sound deadening space S1 in a substantially horizontal direction must move significantly in the vertical direction until it reaches the opening 88 along the path of the cooling air. . Therefore, the vertical length of the exhaust hood 6 can be effectively used to effectively reduce noise.

As shown in FIG. 3, the distance L4 between the partition wall 87 and the second end surface 22 of the package 2, which constitutes the inner wall surface of the first sound deadening space S1, is the distance between the partition wall 87 and the fourth wall 84. It is approximately twice the distance L5 between the wall surface and (L4=L5×2). Therefore, the distance from the partition wall 87 to the air discharge port 24 is longer than the distance from the fourth wall 84 to the partition wall 87 .

That is, the partition wall 87 partitions the first silencer space S1 into two spaces. It is formed larger than the space on the near side.

As a result, a wide path is formed for the cooling air after passing through the air discharge port 24, so the occurrence of pressure loss can be avoided, and the cooling air can flow easily. Moreover, since the flow velocity of the cooling air is lowered, the noise caused by the cooling air can be reduced.

The second muffling chamber 9 is formed in the shape of a hollow box and attached to the fourth wall 84 of the first muffling chamber 8 . In the second sound deadening chamber 9, the surface on the side attached to the first sound deadening chamber 8 and the bottom surface are open. The second sound deadening chamber 9 includes a first plate wall 91 , a second plate wall 92 , a third plate wall 93 , a fourth plate wall 94 and a sound absorbing plate 95 .

The first plate wall 91, the second plate wall 92, the third plate wall 93, and the fourth plate wall 94 are formed from metal plate members. The sound absorbing plate 95 is made of a sound absorbing material.

The first plate wall 91 is provided with its thickness direction facing the lateral direction of the engine generator 100 . In the longitudinal direction of the engine generator 100 , the first plate wall 91 is vertically connected at one end to the fourth wall 84 of the first silencer chamber 8 and at the other end to the third plate wall 93 . The first plate wall 91 is vertically connected to the fourth plate wall 94 at its upper end.

The second plate wall 92 is provided parallel to the first plate wall 91 . In the longitudinal direction of the engine generator 100 , the second plate wall 92 is vertically connected at one end to the fourth wall 84 of the first silencer chamber 8 and at the other end to the third plate wall 93 . The second plate wall 92 is vertically connected to the fourth plate wall 94 at its upper end.

The third plate wall 93 is provided so as to be parallel to the fourth wall 84 of the first silencer chamber 8 . In the longitudinal direction of the engine generator 100, the third plate wall 93 is vertically connected to the first plate wall 91 at one end and vertically connected to the second plate wall 92 at the other end. The third plate wall 93 is vertically connected to the fourth plate wall 94 at its upper end.

The fourth plate wall 94 is arranged above the first plate wall 91, the second plate wall 92, and the third plate wall 93, and is connected to each of the three plate walls.

By connecting adjacent ones of the four plate walls to each other in this manner, a second sound deadening space S<b>2 is formed as an internal space in the second sound deadening chamber 9 . By attaching the second sound deadening chamber 9 to the fourth wall 84 of the first sound deadening chamber 8, the lower end of the fourth wall 84, the first plate wall 91, the second plate wall 92, and the third wall of the second sound deadening chamber 9 The lower end of the plate wall 93 and the exhaust port 90 are formed.

The second sound deadening space S2 is connected to the first sound deadening space S1 through an opening 88 formed in the fourth wall 84 of the first sound deadening chamber 8 . The cooling air that has passed through the opening 88 is introduced into the second sound deadening space S2 from above the second sound deadening chamber 9, as indicated by the white arrow in FIG. After that, the cooling air is discharged to the outside through an air outlet 90 formed at the lower end of the second noise reduction chamber 9 .

In the second sound deadening space S2, sound absorbing sheets 10 made of a sound absorbing material such as an organic porous material or inorganic fiber are fixed to the respective plate walls in the same manner as the walls of the first sound deadening chamber 8. ing. Thus, the second noise reduction chamber 9 also plays a role of reducing noise.

The sound absorbing plate 95 is made of sound absorbing material such as organic porous material or inorganic fiber. The sound absorbing plate 95 is provided between the first plate wall 91 and the second plate wall 92 and parallel to the first plate wall 91 and the second plate wall 92 . A plurality of sound absorbing plates 95 are arranged parallel to each other in the lateral direction of the engine generator 100 .

Each sound absorbing plate 95 has one end vertically connected to the fourth wall 84 of the first sound deadening chamber 8 and the other end vertically connected to the third plate wall 93 in the longitudinal direction of the engine generator 100 .

As described above, in the longitudinal direction of the engine generator 100, the exhaust hood 6 has, as shown in FIG. It is configured to have two partitions of four walls 84 . As a result, when the noise generated inside the package 2 propagates outward in the horizontal direction from the air discharge port 24, each partition wall generates a transmission loss, and the noise outside the exhaust hood 6 is effectively suppressed. can be reduced to In this embodiment, the air discharge port 24 is formed in one end face (that is, the second end face 22) in the longitudinal direction of the engine generator 100 (package 2), and the exhaust hood 6 covers the end face. placed. Therefore, in this embodiment, the sound insulation effect of the exhaust hood 6 in the longitudinal direction of the engine generator 100 can be improved.

Furthermore, in this embodiment, not only the partition wall 87 and the fourth wall 84 but also the third plate wall 93 of the second sound deadening chamber 9 are arranged so as to cover the outside of the air discharge port 24 in the horizontal direction. Therefore, a triple blocking effect is obtained, and noise from the package 2 can be effectively reduced.

As described above, the engine generator 100 includes the package 2 that houses the engine 3 and the generator 4, and the exhaust hood 6 that discharges the air introduced into the package 2 to the outside. The package 2 is formed with an air discharge port 24 for discharging the air inside the package 2 to the exhaust hood 6 . The exhaust hood 6 includes a partition wall 87 and a fourth wall 84 that partition the internal space. The fourth wall 84 is arranged further away from the package 2 than the partition wall 87 is. The partition wall 87 is provided so as to face the air discharge port 24 . An exhaust path through which air flows is formed between the upper end E1, which is one end of the partition wall 87 in the vertical direction, and the inner wall surface of the fifth wall 85 of the exhaust hood 6 . An exhaust path through which air flows is formed between the lower end E2 of the partition wall 87 opposite to the upper end E1 and the inner wall surface of the sixth wall 86 of the exhaust hood 6 .

Thus, by providing two partition walls so as to partition the internal space of the exhaust hood 6, the sound insulation effect of the exhaust hood 6 against the noise generated inside the package 2 and propagated from the air exhaust port 24. can be improved.

Further, in the engine generator 100 of the present embodiment, an air exhaust path is formed between the upper end E1 of the partition wall 87 and the inner wall surface of the fifth wall 85. As shown in FIG. Also, an air exhaust path is formed between the lower end E2 of the partition wall 87 and the inner wall surface of the sixth wall 86 .

As a result, the path of the noise propagating from the air discharge port 24 of the package 2 along the exhaust air path diverges in the vertical direction and detours. Therefore, the vertical length of the exhaust hood 6 can be effectively used to effectively reduce noise.

Although the preferred embodiments of the present invention have been described above, the above configuration can be modified, for example, as follows.

A plate wall may be provided in the second sound deadening chamber 9 so as not to open the entire surface on the side closer to the first sound deadening chamber 8 . By forming an opening of an appropriate size in this plate wall so as to face the opening 88 on the side of the first sound deadening chamber 8, the first sound deadening space S1 and the second sound deadening space S2 can be connected. . In this case, since the second partition wall is a double wall, the sound insulation effect (effect of reducing transmitted sound) can be further improved.

The partition wall 87 may be attached so as to connect the fifth wall 85 and the sixth wall 86 . In this case, the partition wall 87 is provided apart from each of the first wall 81 and the third wall 83, and the cooling air is branched to both sides in the short direction of the engine generator 100 (horizontally). In this configuration, one end of the partition wall 87 in the transverse direction of the engine generator 100 corresponds to the first end, and the other end corresponds to the second end. However, from the viewpoint of effectively utilizing the first sound deadening space S1 elongated in the vertical direction and from the viewpoint of ease of assembly, the first wall 81 and the third wall 83 are connected as in the above-described embodiment. It is preferable to attach a partition wall 87 to the upper and lower sides to branch the cooling air in the vertical direction.

2 package 3 engine 4 generator 6 exhaust hood 24 air outlet 84 fourth wall (second partition wall)
87 partition wall (first partition wall)
100 engine generator

Claims (8)

An engine generator comprising a package that houses an engine and a generator, and an exhaust hood that discharges air introduced into the package to the outside,
The package is formed with an air outlet for discharging the air in the package to the exhaust hood,
The exhaust hood includes a first partition wall and a second partition wall arranged in its internal space,
The second partition wall is arranged further away from the package than the first partition wall,
The first partition wall and the second partition wall are arranged so as not to overlap when viewed in the vertical direction,
The first partition wall is provided to face the air discharge port,
An exhaust path through which air flows is formed between a first end of the first partition wall and an inner wall surface of the exhaust hood,
An exhaust path through which air flows is formed between a second end of the first partition wall opposite to the first end and an inner wall surface of the exhaust hood. engine generator. The engine generator according to claim 1,
The first end is the upper end of the first partition wall,
The engine generator, wherein the second end is a lower end of the first partition wall. The engine generator according to claim 1,
The engine generator, wherein the first partition wall is arranged at a position higher than the second partition wall in a height direction. The engine generator according to claim 1,
The engine generator, wherein the distance between the first partition wall and the air outlet is longer than the distance between the first partition wall and the second partition wall. The engine generator according to claim 1,
An engine generator, wherein the exhaust hood has a first noise reduction chamber and a second noise reduction chamber. The engine generator according to claim 5,
The engine generator, wherein the first partition wall is arranged in the first silencer chamber. The engine generator according to claim 5,
The engine generator, wherein the first partition wall faces an opening provided between the first sound deadening chamber and the second sound deadening chamber. The engine generator according to claim 5,
The distance between the upper end of the first partition wall and the upward inner wall surface of the first muffling chamber is the distance between the lower end of the first partition wall and the downward inner wall surface of the first muffling chamber. An engine generator characterized by being smaller.

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