JPH09215262A - Low-noise power supply vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply vehicle having a sound proof chamber with good sound attenuation while rain or water is prevented from permeating inside through an air inlet. SOLUTION: A soundproof chamber 3 is provided on a chassis of a truck. A generator operated by an internal combustion engine is stored in the soundproof chamber 3, while a fan of taking in outer air is provided. The side wall 4 has double wall structure, and an outer door part 25 at an outer wall and an inner door part 26 at an inner wall are included. A space 27 between the outer door part 25 and the inner door part 26 is used as a path for outer air, while an air inlet 30 is provided at a lower end of the space 27 and air vent 31 is provided at an upper end thereof. The outer air is taken from the air inlet 30 and passed through the space 27 and the inlet vent 31 to the inside of the sound proof chamber 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called power supply vehicle equipped with a soundproof room in which a power generator operated by an internal combustion engine is housed, and more particularly to soundproof and waterproof measures for the soundproof room.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view of a conventional low-noise power supply vehicle 40. This power supply vehicle is used for outdoor movie shooting, television broadcasting, concerts, or in an emergency such as an urban area. A vehicle equipped with a power generator capable of supplying electric power anytime, anywhere for power supply. In this power supply vehicle 40, a soundproof room 42 is mounted on a rear chassis of a truck 41, and the internal combustion engine and a generator operated by the soundproof room 42 are housed in the soundproof room 42.

Since external air is required for operating the internal combustion engine, an intake port 43 for taking in the external air to the soundproof chamber 42 is provided at the rear surface portion 44 and / or both side surface portions 45 of the soundproof chamber.
It is usually provided in. These intake ports 43 are formed from a large number of slit-shaped long hole portions 47, and outside air is introduced from these long hole portions 47, part of which is supplied to an internal combustion engine for power generation and other air Are used for cooling internal combustion engines and generators. Furthermore, this air is also configured to be supplied to a radiator for cooling the cooling water for cooling the internal combustion engine. At the same time, the fan that supplies air to this radiator also fulfills the function of sucking outside air. On the other hand, although the exhaust port is not shown in the figure, the air is normally provided on the ceiling of the soundproof room 42, and the air is exhausted upward.

[0004]

In the above conventional power supply vehicle, the intake port for introducing the outside air is provided on the wall surface of the rear surface or both side surfaces of the soundproof chamber, but the intake port has a slit-like long shape. Since it is formed from the long hole portion, there is a problem that rainwater and the like enter through the long hole portion, and there is also a problem that the soundproof effect is attenuated in soundproofing. In the case of the conventional power supply car for construction, the noise of about 80 phone is usually generated, but it is 6 when using the power supply car in outdoor movies, concerts, and urban areas.
It is necessary to stop the noise to about 0 phone. In view of this, the present invention provides a power supply vehicle having a soundproof room with extremely high soundproof effect in which rainwater or the like is prevented from entering through the air inlet and the structure of the portion where air is introduced into the soundproof room through the air inlet. The task is to do.

[0005]

In order to solve the above problems, a first aspect of the present invention is to provide a soundproof chamber 3 on a chassis of a vehicle, and inside the soundproof chamber 3, an internal combustion engine 9 and the internal combustion engine 9 are provided. The generator 8 operated by the engine 9 is housed, an intake port and an exhaust port 20 are provided at appropriate positions in the soundproof chamber 3, and a fan 11 for introducing outside air from the intake port is provided at an appropriate position inside the soundproof chamber 3. In the low-noise power supply vehicle provided, at least a part of the wall surface of the soundproof room 3 is configured by an inner and outer double wall, and a space 27 is provided between the outer wall and the inner wall to form an air passage 27,
An intake port 30 for air from the outside is opened below the inner and outer double walls, and an introduction port 31 for introducing the air in the air passage 27 into the soundproof chamber 3 is provided at an appropriate position on the inner wall. It passes through the space 27 in the wall surface and is introduced into the soundproof room 3 from the introduction port 31. In this way the outside air
It is taken in from an intake port 30 provided below the double wall, that is, from below the peripheral edge of the floor of the soundproof chamber 3, passes through the air passage of the space 27 between the double walls, and is located at an appropriate position on the inner wall. Since it is introduced into the soundproof room 3 through the inlet 31, the presence of the air passage and the high-speed passage of the air through the air passage do not let the noise of the internal combustion engine and the generator inside escape to the outside, and effectively prevent noise. Exert an effect. Moreover, the outside air can be completely prevented from entering the rainwater and the like by being sucked in from the bottom to the top at the periphery of the floor of the soundproof room.

A second aspect of the present invention is the same as the first aspect of the present invention, wherein the inlet 31 is formed at a position laterally separated from the inlet 30, and the inlet 31 is vertically arranged on the inner wall. It is formed long in the direction. In the present invention, since the distance between the intake port and the introduction port is large,
The distance of the air passage through which the air passes becomes longer, further improving the soundproofing effect.

In the third aspect of the present invention, a soundproof room 3 is provided on a chassis of a vehicle, an internal combustion engine 9 and a generator 8 operated by the internal combustion engine 9 are housed in the soundproof room 3, and the soundproof room 3 is installed. In a low noise power supply vehicle in which an intake port and an exhaust port 20 are provided at appropriate positions in the chamber 3, and a fan 11 for introducing outside air from the intake port is provided at an appropriate position inside the soundproof chamber 3,
The door portion 6 is provided on the wall surface of the soundproof room 3, and the door portion 6 is formed of an outer door portion 25 and an inner door portion 26 that are separated by a predetermined distance, or an outer surface portion 16 and an inner surface portion that are separated by a predetermined distance. By forming it from a single door having 17 and 17, a space 27 is formed inside the door portion 6 to form an air passage.
The lower opening of the air inlet 30 of the air from the outside, the upper opening as the air inlet 31 into the soundproof chamber 3,
The space 2 inside the door 6 from the intake port 30 where the outside air is located below
It is introduced into the inside of the soundproof room 3 through the introduction port 31 located above and passing through 7. In the present invention, the door portion 6 provided in the soundproof chamber 3 is replaced by the outer door portion 25 and the inner door portion 2
6 double door, or a single door having a double structure having an outer surface portion 16 and an inner surface portion 17, and outside air is introduced from an intake port 30 located below the door portion 6 (floor of the soundproof room). Sucked,
Since the air passes through the space 27 provided in the middle at high speed and is introduced into the soundproof room 3 from the inlet 31 located above the door portion 6, the high-speed air passing through the space 27 provides a soundproof effect. Is demonstrated. Moreover, the outside air is completely sucked in from the bottom of the soundproof room from the bottom to the top so that rainwater and the like can be completely prevented from entering.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 6 show an embodiment of the present invention. FIG. 1 schematically shows the overall appearance of a low-noise power supply vehicle according to the present invention, in which (A) is a side view and (B) is a rear view. Reference numeral 1 is a truck equipped with a diesel engine, and a soundproof room 3 is installed at a location on the rear side of a chassis 2 of the truck 1 where a luggage carrier is mounted. On both side walls 4 and 4 of the soundproof room 3, door portions 6 and 6, which will be described in detail later, are provided at two locations. Therefore, in this embodiment, the door portions 6 are formed at a total of four locations. Inside the soundproof room 3, a generator and a diesel engine, which is an internal combustion engine for operating the generator, are housed.
The door portion 6 is provided for inspection, maintenance, maintenance and repair of the generator and the internal combustion engine housed inside the soundproof room 3.

When the door 7 provided on the rear wall surface 5 of the soundproof room 3 is opened, an operation panel for operating the internal combustion engine and the generator housed therein is provided therein. Although not shown in the figure, an intake port for taking in outside air into the soundproof chamber 3 is provided at the lower end of the door portion 6, sucked in the direction of arrow P in the figure, and exhausted in the direction of arrow Q in the figure. It is discharged from the mouth 20. Therefore, the intake port is, so to speak, a soundproof room 3
It is installed on the floor of the, and outside air is inhaled from below, so that rainwater and the like can be completely prevented from entering. A power supply vehicle having such a form can be used as a power source for outdoor movie shooting, television broadcasting, concerts, or emergency emergencies in urban areas, and can be moved to and supplied with power anywhere and anytime. .

FIG. 2 is a central longitudinal cross-sectional explanatory view of the portion of the soundproof room 3 where the portion of the track 1 is omitted. The soundproof room 3 has a box-shaped substantially rectangular parallelepiped outer shape, a closed space is formed inside the soundproof room 3, and an appropriate soundproof material such as a sound-absorbing material, a sound-deadening material, or a sound-insulating material having a certain thickness is provided on the entire inner surface of the wall surface. It is a stretched one. Inside, a generator 8 and a diesel engine 9 for operating the generator 8 are housed and fixed. Reference numeral 10 denotes a radiator. The radiator 10 circulates cooling water for cooling the diesel engine 9, and a cooling fan 11 for sending air to the radiator 10 is rotationally driven by the diesel engine 9.

Reference numeral 13 denotes an air filter. Air is taken from the air filter 13 as indicated by an arrow R, and oxygen is supplied to the engine. On the other hand, 14 is a muffler, and exhaust gas of the engine is exhausted upward from an upper outlet of an exhaust pipe 15. The soundproof chamber 3 is provided with an intake port and an exhaust port 20. The intake port is provided in the lower part of the door portion as will be described later, although it does not appear in this cross-sectional view. The air is sucked from the floor of the soundproof room 3 in the direction of arrow P from the bottom to the top. Exhaust port 20 is soundproof room 3
It is installed near the driver's seat of the truck on the ceiling 12 of
The exhaust port 20 is provided with an exhaust door 21 that can be opened and closed. The exhaust door 21 is configured to automatically open and close by the operation of the hydraulic cylinder driven by the diesel engine 9. That is, when the engine is started, the exhaust door 21 is automatically opened in the arrow direction, air is discharged as shown by the arrow Q, and when the engine is stopped, the exhaust door 21 automatically closes the exhaust port 20. .

Explaining the flow of air introduced from the outside, first, the door 7 provided on the rear wall surface 5 of the soundproof room 3 is opened, and the operation panel 23 is operated to start the diesel engine 9. When starting the engine, the air required for engine combustion is introduced from the air filter 13.
When the engine starts, the cooling fan 11 starts rotating,
Air is supplied to the radiator 10. Due to the rotation of the cooling fan 11, the air in the soundproof chamber 3 is exhausted through the exhaust port 20.
Move in the direction of. As a result, external air is supplied from the intake port (arrow P). Therefore, the cooling fan 11 also functions as a fan for sucking the outside air.

The partition wall 24 is formed so that the air flow in the soundproof chamber 3 is finally effectively directed from the lower side to the upper side. The exhaust gas of the diesel engine 9
The air is discharged from the upper outlet of the exhaust pipe 15 and rides on the flow of air in the soundproof chamber 3 (flow from the lower side to the upper side).
It is discharged to the outside from the exhaust port 20 provided in No. 2 (arrow Q). The flow of air in the soundproof chamber 3 is caused by the action of the cooling fan 11 as described above, and this air first supplies oxygen to the diesel engine 9 and further cools the generator 8 and the diesel engine 9 externally. It is also used for reducing the temperature of the cooling water in the radiator 10 for cooling the water of the diesel engine 9, and fulfills various functions.

FIG. 3 is a partial cross-sectional explanatory view of the soundproof room 3 in the horizontal direction. Since this cross section is vertically symmetrical with respect to the center line O, only the lower half cross section is shown, and it is housed inside. Illustration of the internal structure of the generator 8 and the diesel engine 9 is omitted. The structure of the door portion 6 can be seen from this figure. Sound absorbing materials are appropriately joined to the inner surfaces of the front wall surface, both side walls 4, 4 and the rear wall surface 5 of the soundproof room 3 for soundproofing. The both side walls 4, 4 are an outer wall and a inner wall of soundproof walls. It has a double wall structure. The two side walls 4 and 4 are each provided with a door portion 6 at each of two places. In each door portion 6, an outer door portion 25 is provided on an outer wall, and an inner door portion 26 is provided on an inner wall. It is provided at the position and constitutes the door portion 6. That is, the door portion 6 includes the outer door portion 25 and the inner door portion 26.
And a double door structure, and a constant gap is provided between them. The outer door portion 25 and the inner door portion 26 are
Each of them is hinged to the side wall 4 of the soundproof chamber 3 on the left side in the figure, and is rotated in the direction shown by an arrow D in the figure to open and close.

A space 27 is formed by the distance between the outer door portion 25 and the inner door portion 26, and the lower opening of the space 27 forms an intake port for taking in outside air.
Moreover, the upper opening of the space 27 forms an inlet for the outside air into the soundproof room 3. Therefore, in FIG. 3, the outside air flows into the space 27 from the back side of the paper toward the front side. Each of the outer door portion 25 and the inner door portion 26 is formed of a soundproof door in which a sound absorbing material is joined to the inner surface thereof, and there is a space 27 that serves as an air passage. The presence of the wall
The internal noise can be shut out more completely.

FIG. 4 is a horizontal partial cross-sectional explanatory view showing another embodiment of the soundproof room, which is almost the same as the embodiment shown in FIG. 3 and the positions of the intake port and the introduction port are different. It's different. That is, in this embodiment, the intake port 30
Is provided only at the lower end of the door portion 6 on the left side in the figure,
The other side wall 4 and the floor portion 35 below the door portion 6 on the right side in the figure
Is closed. In other words, the floor portion 35 of the soundproof room 3
Only the lower end of the door portion 6 on the left side in the figure of the side edge of is opened, and the opening serves as the intake port 30. And the inlet 3
1 is formed as a vertically long opening on the side of the inner door portion 26 on the right side in the drawing, and the space 2 is formed through this inlet 31.
The air in 7 is introduced into the soundproof room 3.

Therefore, the outside air is taken in from below (from the back side of the paper in the drawing) through the intake port 30 located at the lower end of the left door portion 6, and the space between the outer wall and the inner wall of the side wall 4 is taken. The inlet 3 which passes through 27 and is located on the right end side of the side wall 4.
It is introduced into the soundproof room 3 via 1 (arrow S in the figure). In this embodiment, the distance of the space 27, which is the passage of air, becomes long, so that the soundproof effect is further improved. In this way, the position of the introduction port is not only above the door portion as in the above-described embodiment, but may be a side portion of the inner wall or the inner door portion, or may be vertically long. The position, shape, etc. can be freely provided as appropriate. On the other hand, similarly, the position of the intake port is also provided at an appropriate position on the side edge of the floor of the soundproof room, for example, not at the lower end of the door 6 but only at the lower end of the side wall 4 on the left end side in FIG. Alternatively, it may be provided on the rear edge in some cases and can be freely designed.

FIG. 5 is a cross-sectional explanatory view of the soundproof room 3 according to the embodiment shown in FIGS. 3A and 3B. The cross section on the left side of the center line O is the XX cross section of FIG. 1, and the cross section on the right side is FIG. Y-
The Y cross section is shown, and the internal structure of the generator, engine, etc. is omitted. Although the structure of the door portion 6 is more clearly shown in this cross-sectional explanatory view, the outer door portion 25 and the inner door portion 26, which are soundproof doors, are provided substantially in parallel with each other with a constant interval. A space 27 is provided between them. This space 27
Of the space 27 forms an inlet 31 through which the outside air is introduced into the soundproof chamber 3.

As described above, the outside air is sucked by the cooling fan provided inside the soundproof chamber 3 and passes through the space 27 serving as an air passage at a considerable flow rate, and the rapid flow of the air is generated inside. Since it also exhibits the effect of effectively blocking the noise of the above, the double-structured door portion has an extremely high soundproofing effect despite having the intake port 30. On the other hand, in the portion where the door portion 6 is not provided, as can be seen from the cross section of the right half of FIG. 4, the side wall 4 has a double structure of an inner wall and an outer wall by a soundproof wall, and a more complete soundproof effect is exhibited. Of. Further, as shown in this figure, a step 36 through which air can flow can be provided at the intake port 30. This makes it convenient to open the inner door 26 and enter the inside for maintenance or inspection of the inside. With the above configuration, in the present invention, the noise generated from the power supply car can be suppressed to 60 phone or less, and the present invention can be used without any trouble even in outdoor movie shooting, television broadcasting, concerts and the like. .

FIG. 6 is a cross-sectional explanatory view showing another embodiment of the door portion, and shows the door portion 6 consisting of a single door having a double structure. Like the double door described above, this door portion 6 is hinged to the side wall 4 of the soundproof chamber 3 so as to be openable and closable in the direction of arrow D, and the outer surface portion 16 and the inner surface portion 17 are hinged sides. What is connected at the edge portion (FIG. 6 (A)), what is connected at the side edge portion opposite to the side where the outer surface portion 16 and the inner surface portion 17 are hinged (FIG. 6 (B)), and the outer surface Three types are illustrated, in which both side edges of the portion 16 and the inner surface portion 17 are connected (FIG. 6C).

The outer surface portion 16 of the door portion 6 constitutes the same surface as the outer wall of the double wall, and the inner surface portion 17 thereof constitutes the same surface as the inner wall of the double wall, which is the above-mentioned double door. It is similar to the door 6. A sound absorbing material is appropriately joined to each of the outer surface portion 16 and the inner surface portion 17 of the door portion 6 so that the door portion 6 is composed of two soundproof walls. Each of these door portions 6 is provided with a space between the outer surface portion 16 and the inner surface portion 17 to form a space 27. This space 27 serves as an air passage, and the lower opening portion of this space 27 is used for intake. The mouth is formed, and the opening above the mouth serves as the inlet. As a result, the outside air is sucked from the intake port below the door 6, passes through the space 27 at a high speed, and is introduced into the soundproof room from the inlet above the door 6. By passing the air through the space 27 at a high speed, the soundproofing effect becomes extremely high in combination with the use of the sound absorbing material.

Although the embodiments have been described above, various modifications can be made to the present invention as follows. First, the number of doors having an intake port for taking in outside air may be one or more, and depending on the types and sizes of internal combustion engines and generators stored inside,
It is possible to design as many as necessary. On the other hand, the position of the intake port for taking in the outside air does not have to be at the lower end of the door portion, and can be provided at any of the side edge portion or the rear edge portion of the floor of the soundproof room. Further, the introduction port can be implemented not only above the door portion but also at any place on the inner wall of the soundproof room. The position where the switchboard is provided may be not only the rear wall surface of the soundproof room but also the side wall portion. In this case, the door portion provided with the intake port may be provided on the rear wall surface. Regarding the structure of the door portion, in the above-described embodiment, two soundproof doors are used, and a space is provided between them to provide substantially parallel, but one soundproof door is used, and as shown in FIG. As illustrated, one soundproof door may have a double structure.

That is, a space may be provided between the outer surface portion and the inner surface portion, and one side edge or both side edges of the outer surface portion and the inner surface portion may be connected to form a single door portion. The lower opening of the space may be the intake port, and the upper opening of the space may be the inlet. The distance between the spaces provided in the door portion, the size of the door portion, or the like can be appropriately determined according to the size of the soundproof room or the internal structure. The present invention can be implemented even if either or both of the outer door portion and the inner door portion of the door portion are not particularly soundproof doors. Alternatively, even in the case of a door having a double structure, one or both of the outer surface portion and the inner surface portion can be used without being a soundproof door. This is because the flow velocity of the air passing through the space of the door becomes high, so that the internal noise is not escaped to the outside and the soundproof effect can be maintained.

Although the intake port is provided only at the lower end portion of the door portion, it can be provided not only at the lower end portion of the door portion but also at the lower end portion of the side wall where the door portion is not provided. However, by limiting the intake port to the lower end of the door, the cross-sectional area of the space that is the inflow passage for the outside air can be narrowed, and as a result, the flow velocity of the inflowing outside air can be increased and the soundproof effect can be improved. You can Furthermore, by providing a space as a passage for outside air in the door part, it is convenient for cleaning the space and removing dust and obstacles. Therefore, the intake port should be limited to the lower end part of the door part. Is preferred. The cooling fan in the above embodiment is not particularly for cooling the water of the radiator, and is provided at an appropriate position in the soundproof room only for the purpose of simply sucking the outside air from the intake port and air-cooling the internal combustion engine or the like. Good. Regardless of the type of internal combustion engine that operates the generator, diesel engine, other gasoline engine, L
Various internal combustion engines such as a PG gas engine can be used.

[0025]

The power supply vehicle according to the present invention has the following effects. In the first aspect of the present invention, the outside air is
It is taken in from the intake port provided below the double wall, that is, taken from below the peripheral edge of the floor of the soundproof room, passes through the air passage in the space between the double walls, and from the introduction port at the appropriate position on the inner wall. Since it is introduced into the soundproof room, the presence of the air passage and the high-speed passage of the air through the air passage prevent the noise of the internal combustion engine and the generator inside from escaping to the outside, and effectively exhibit the soundproof effect. Moreover, the outside air is at the periphery of the floor of the soundproof room,
Since the air is taken in from the bottom to the top, it is possible to completely prevent the entry of rainwater and the like. In the second aspect of the present invention, since the distance between the intake port and the introduction port can be increased, the distance of the air passage through which the air passes is increased, and the soundproof effect is further improved.

In the third aspect of the present invention, the door portion provided in the soundproof chamber has a double structure, and the outside air is taken in through the intake port located below the door portion (floor portion of the soundproof chamber). ,
By passing through the space provided between the double structure and being introduced into the soundproof room from the inlet located above the door, the high-speed air passing through the space of the door exerts a soundproof effect. Moreover, since the outside air is sucked upward from the bottom of the soundproof room, rainwater or the like can be completely prevented from entering. Furthermore, since the space inside the door forms the passage for introducing the outside air, it is easy to clean the space, and if there is something such as dust or other obstruction clogged in this space. Also has the advantage that it can be easily removed by opening the outer door. As described above, the present invention exerts a great effect.

[Brief description of drawings]

FIG. 1 is a schematic view of an entire power supply vehicle according to the present invention, in which (A) is a side view and (B) is a rear view.

FIG. 2 is a central vertical cross-sectional explanatory view of a soundproof room according to the present invention.

FIG. 3 is a horizontal partial cross-sectional explanatory view of the soundproof room according to the present invention, in which the internal structure is omitted.

FIG. 4 is a horizontal partial cross-sectional explanatory view showing another embodiment of the soundproof room according to the present invention, in which the internal structure is omitted.

5 shows a cross section of the soundproof room according to the present invention, a cross section on the left side of the center line shows a cross section along the line XX in FIG. 1, and a cross section on the right side of the center line shows a cross section along the YY line in FIG. However, the internal structure is omitted.

FIG. 6 is a transverse cross-sectional view illustrating another embodiment of the door portion according to the present invention, in which (A) shows that the outer surface portion and the inner surface portion are connected at the side edge on the side where they are hinged. (B) shows that the outer surface portion and the inner surface portion are connected at the side edge opposite to the hinged side, and the (C) shows that the outer surface portion and the inner surface portion are It is shown that they are connected at both edges.

FIG. 7 is a perspective view of a conventional low noise power supply vehicle.

[Explanation of symbols]

1 ... Truck, 2 ... Chassis, 3 ... Soundproof room, 4 ... Side wall, 5 ... Rear wall surface, 6 ... Door part, 8 ... Generator, 9 ... Diesel engine, 11 ... Fan, 16 ... Outer surface part, 17 ... Inner surface part , 20 ... Exhaust port, 25 ... Outer door part, 26 ... Inner door part, 27 ... Space, 30 ... Intake port, 31 ... Inlet port

Claims (3)

[Claims] 1. A soundproof room (3) is provided on a vehicle chassis,
Inside this soundproof room (3) is the internal combustion engine (9)
This soundproof room houses the generator (8) which is operated by (9).
In a low-noise power supply vehicle in which an intake port and an exhaust port (20) are provided at appropriate positions in (3), and a fan (11) for introducing outside air from the intake port is provided at an appropriate position inside the soundproof room (3). , Soundproof room (3)
At least a part of the wall surface of the inner and outer walls is configured with an inner and outer double wall, and a space (27) is provided between the outer wall and the inner wall to form an air passage (27), and an air intake port (30) for the air from the outside is formed. An inlet (31) that opens downward between the inner and outer double walls and introduces air from the air passage (27) into the soundproof chamber (3) is provided at an appropriate position on the inner wall, and outside air is introduced from the intake port (30) to the wall surface. Inlet (31) through the inner space (27)
A low-noise power supply vehicle characterized by being installed in a soundproof room (3). 2. The introduction port (31) is formed at a position laterally separated from the intake port (30), and the introduction port (31) is formed on the inner wall in the vertical direction. The low noise power supply vehicle according to claim 1, wherein the low noise power supply vehicle is provided. 3. A soundproof room (3) is provided on a vehicle chassis,
Inside this soundproof room (3) is the internal combustion engine (9)
This soundproof room houses the generator (8) which is operated by (9).
In a low-noise power supply vehicle in which an intake port and an exhaust port (20) are provided at appropriate positions in (3), and a fan (11) for introducing outside air from the intake port is provided at an appropriate position inside the soundproof room (3). , The door part (6) is provided on the wall surface of the soundproof room (3), and the door part (6) is formed by the outer door part (25) and the inner door part (26) separated by a predetermined distance, or
By forming (6) from a single door having an outer surface portion (16) and an inner surface portion (17) that are separated by a predetermined distance, a space (27) is formed inside the door portion (6), and air is formed. This space (2
Use the lower opening of 7) as an air intake port (30) for air from the outside,
The upper opening is used as the air inlet (31) into the soundproof room (3), and the outside air passes through the space (27) inside the door (6) from the lower air intake (30) to the upper side. A low-noise power supply vehicle characterized by being introduced into the soundproof room (3) through the located inlet (31).