Supply unit with a motor generator unit as power generator

The invention relates to a supply unit with a motor-generator unit as a power generator, in particular for mounting on heavy goods vehicles, campers, behördliche- and military vehicles of all kinds for the electrical supply of the driver's cab, wherein the generator of a sound-absorbing capsule is enclosed, which supply air duct a includes for cooling air and an exhaust stack for exhaust air and said cooling air is sucked by means of a fan arrangement on the motor shaft.

Supply units of this type are useful because as trucks are increasingly being used over long distances and thus their cab increasingly a break during prolonged driving breaks, even for overnight stays, serving. During this operation pauses is a cabin supply of electric power to illuminate the cabin, necessary for the operation of air conditioners, microwave cookers, of apparatus of entertainment electronics, and the like.

From emission technical, economic and legal reasons it is not permitted, parking and rest periods to allow the large main engine because of low electric power consumption of about 1 ÷ 3 kW while running to supply the cab.

This applies mutatis mutandis for campers, governmental and military vehicles of all kinds.

It has therefore been proposed to provide trucks with supplies of the aforementioned type, which is available on the truck frame space. These supply units require only a small construction volume, as electricity generators used to make do with low power, so that the motor-generator units used require very little space. The environment is thus only slightly affected by the operation and placement of the generator in sound-absorbing capsules, acoustic emission is very low.

The present invention has for its object to realize a supply unit of the aforementioned type with a particularly small volume and provided with an acoustically particularly effective encapsulation, whereby high demands arising on the effectiveness of the interior cooling of the capsule.

This object is achieved according to a supply unit of the kind mentioned in that the fan arrangement comprises at least two separate fan units, namely an inner fan for the aggregate cooling within a housing for the generator and an external fan for the capsule cooling outside of the unit housing, and that separate intake paths of cooling air are provided for both fan units.

According to this proposed invention it is provided that, a so-called dual-fan is provided on the crankshaft of the engine or its extension on the input side for the cooling air, which is usually the motor fan is seated. This comprises a so-called internal fan, which is disposed inside the motor casing (air conduction casing) and thus corresponds to the motor fan, and a so-called external fan disposed outside of the unit housing and is provided for the capsule cooling in the cavity between the assembly housing and the capsule interior wall.

Preferably, two identical fans are used respectively in the manner of a radial fan in question, whose rotors are driven by the crankshaft speed.

In order to achieve particularly effective cooling, it is advantageous that separate intake ducts for the cooling air to the two fan units are provided, so that an optimum amount vote for the two cooling air streams is made possible.

In the case of a motor-generator unit, these two units are advantageously accommodated in a common unit housing, the cooling air governs the heat load on both units.

According to a further inventive proposal, it is provided that the flow path for a first partial flow of the aspirated cooling air comprises a first air supply duct to a tube connection piece which is adjacent to a central intake opening in the end wall of the unit housing the inner fan for the aggregate cooling connected.

The pipe connection is made sure that the air sucked in by internal fans partial flow directly enters the inside of the unit housing and flows through the entire housing past the hot engine aggregates and also to the heat source of the generator from there to cool.

In addition, a second air supply channel is provided advantageously as a flow path for a second partial flow of the aspirated cooling air, comprising a wall opening which is arranged close to the external fan for cooling the capsule.

Through this wall opening of the cooling air stream passes directly to the central intake port of the outdoor fan and is blown out radially therefrom and flows around the outside of the assembly housing, said cooling air flow flows through the cavity between the inside of the insulating cap and the outer contour of the unit housing.

In order to influence both cooling air streams as little as possible to each other, is provided according to an advantageous embodiment, the pipe socket of the first air supply channel extending in the axial direction of the generating unit within the wall opening of the second air supply channel and within the central intake of the external fan.

The wall of the socket one hand acts as an outer boundary of the air supply for the first partial flow, the other as inner boundary for the supply air duct of the second substream, ie both partial streams enter separate channels directly in front of the respective fan blades.

On the supply side, a common supply air duct is provided for both streams; on the exhaust side, a common exhaust air shaft is provided inside the capsule for both partial flows.

In supply air duct is suitably an oil cooler for the engine and / or cooled electrical components of the power unit; the uptake shaft of the engine muffler is appropriate, said other hot components of the exhaust system can also be accommodated in the exhaust stack. Because of the advantageous exhaust duct, a silencer Mounting the motor directly to the engine is possible.

For optimal management of partial airflow for cooling capsule, the invention provides that within the capsule the generator close, axially parallel partitions are assigned, which channel the cooling air for the cooling capsule.

As already stated above, both the fan units are expediently designed as a radial fan, wherein the cooling power of the inner fan, the motor housing flows through the inside of the cooling flow of the outdoor fan flows over the assembly housing on the outside and both of cooling flows extend in the same direction substantially.

Regarding the assignment of the two input ducts, as an advantageous embodiment of the invention is that the first air supply duct is arranged inside the second, and that the two air supply channels are connected to the common supply air duct.

For assembly reasons, it is expedient, that the first air supply duct is attached to a separate mountable from the outside wall member of the capsule.

In the following, an embodiment of the invention will be explained with reference to the drawing. It shows<dl id="dl0001" compact="compact"><dt>Fig. 1</dt><dd>a side view of the supply unit for remote capsule wall and</dd><dt>FIG. 2</dt><dd>a horizontal section in the upper region by the two air inlet ducts</dd></dl>

The complete supply unit in accordance with the <figref idrefs="f0001">figures 1</figref> and <figref idrefs="f0002">2</figref> is incorporated in a closed capsule 1, whose walls are formed from steel sheet with a (not shown) insulating layer on the inside.

In the interior of the capsule 1 is the actual generator 2, in the housing 3 behind the other on a vertical axis, a motor 4 and a generator 5 are fitted. The unit case 3 is relatively narrow covered by intermediate walls, namely a bottom 6 of the intake shaft 22a, a left short side wall 8 above the unit case 3 and a, also shown in section lower bottom wall 9. In addition, other partitions may be provided on front and back to channel the cooling air in addition, the partition walls to a ventilation shaft 10 are open below the unit housing. 3 The outlet pipe 10 is delimited towards the inside of the housing by a lateral partition 11. Between this and the left capsule wall 12, the air rises and exits the outlet pipe 10 through the ventilation grille. 13

On the supply side is located above a bottom panel 14, a supply air duct 15 with an air inlet grille 16. The air sucked from the ambient air is sucked in by a dual-fan arrangement, consisting of an outdoor fan 17 and a broken line, which is arranged within the unit housing 3 interior fan 18th

The indoor fan 18 is connected to its central suction hole through a pipe connection 19 to a first supply air channel 20 with side wall 20a, which the air intake 15 is open.

The outdoor fan 17 is connected via a wall opening 21 having a second air supply channel 22, which opens also in the supply air duct 15th provides for the separation of the two streams to supply air duct out one from the bottom of the first air supply channel 20 are bent downward partition 23. A first partial flow according to the arrow 24 flows through the first supply air channel 20 and further through the pipe stub 19 into the interior of the unit housing 3 and of continue up aggregates of the diesel engine 4 and those of the generator 5 down. It occurs as a warmed air according to arrow 25 on the underside of the unit housing 3 and exits from there via the outlet pipe 10 and through the ventilation grille, the capsule 13. 1

A second partial flow as indicated by arrow 26 flows through the second supply air duct 22 and passes through the opening 21 in the floor panel in front of the suction opening of the outer fan 17. This creates a radial air flow on the upper side of the unit case 3, where the second partial stream by the lateral partition walls in accordance with arrows 27, is deflected 28 down to flow down on the outer sides on the assembly housing 3 and from there according to arrows 29 also in the uptake shaft 10, where the second part stream combined with the first partial flow and the exhaust air through the ventilation grille 13 exits.

The first supply air duct 20 is formed with its channel walls on the underside of a removable housing plate thirtieth In an attached housing plate 30, the first supply air channel 20 is within the housing walls of the second air supply channel 22, which flows through the second partial stream according to arrows 26th

On the lower housing wall of the capsule 1 rail-shaped support members 31, 32 are fastened, on which the power unit is supported via damping elements 33rd