DE1488595C3 - Electric motor with air-cooled casing - Google Patents

Description

1 sheet of drawings

Claims (1)

1 2 connected, with increasing speed Claim: speed is decreasing. For this reason, the elaborate ribs can be provided. Electric motor with air-cooled housing man- The invention is based on the object to improve the tel, which includes the rotor and the stator of the motor 5 cooling air duct in an electric motor of the type mentioned above, with a type indicated on the rotor shaft,
The invention eliminates the above-mentioned after the surface of the jacket promotes, with this part due to the fact that the outlet slots with the jacket is designed as a cylindrical housing, generating the jacket an acute angle, before the blowout opening in the pressure area of the fan preferably 45 °, so that the flow has openings which cooperate circumferentially with guide devices such velocity components that the flow exits in each of the longitudinal directions to the jacket, that it is accelerated and along the openings on the surface of the jacket .
The invention uses the known Coanda effect, characterized in that the outlet slits 15 from that an accelerated flow, which in the form of the generatrix of the jacket has a pointed win- a flat jet tangential next to a stream, preferably 45 °, so that the mung profile emerges to the profile surface, z. B. on flow with such velocity compo- the cylindrical motor housing, applies,
nents in the circumferential and longitudinal direction to the man- On the basis of the drawing, the invention is closer tel emerges that it is explained on the surface of the 20. Coat. Fig. 1 shows a pump with a device according to the invention trained motor-fan housing in sees and partially in section; F i g. 2 shows an enlarged partial section longitudinally The invention relates to an electric motor with air 25 of the line H-II in FIG. cooled housing jacket, the runner and the device shown consists of one The motor's stator includes, with one on the motor 1, a fan 2 that is on the motor shaft 3 Rotor shaft arranged fan, which is arranged a cooling, and a pump, which is located in the promotes air flow over the surface of the jacket, pump housing 4 is located. By means of a this jacket as a cylindrical housing aus- 30 nut 5 is a cylindrical housing 6, which at the same time is formed, which is in the pressure area of the fan from the fan housing and motor housing, on the pump Has blow openings, the pen housing 4 screwed on with guide devices. The engine is cooperate in such a way that the flow in each in the lower part 7 of the motor fan housing and is of the openings is accelerated and along the completely tightly enclosed in this part of the housing Surface of the jacket emerges. 35 sen. In the upper part 8 of the motor fan housing An electric motor of this type is located by the British on the fan rotor with the blades 9, Patent 681,419 known. There the cooler is designed as a radial fan in this case. air through the radial planes of the motor shaft The fan sucks in axially through openings 10 and The outlet slits lying at an acute angle convey the air out of the part 8 through openings 11 for generating the cylindrical jacket blown out 40 of the housing to the outside. sen. This arrangement requires a strong wind. In Fig. 2, three openings 11 are in cross section shadow represented by the webs between the openings. The part 12 of the inner surface of the housing gene is conditional, and in addition, the flow dissolves with the outer surface 13 of a tab, which from punched out relatively quickly from the housing in the form shown due to the acute exit angle the cylindrical outer jacket. 45 is a converging in the flow direction 14 An electric motor is also known in which the gap 20, in which the flow is accelerated, the cooling air flow generated by the fan. This gap is swept inside by the flow path The housing is designed in a streamlined manner half of the opening, which is shown schematically on the left in FIG. 2 (German utility model 1 757 201). At which- is interpreted, extended inward. The current Sem known device cooling fins are provided, 50 occurs at point 15 approximately tangentail to the stream fix the flow of cooling air in the axial direction. profile created by punching out the opening Apart from the fact that one is formed from adjacent cooling fins, from each opening 11 and lies Danger of dust accumulation and thus a reduction in the on the outer surface of the housing. This anlie-cooling effect Strongly favor is a motor housing lowing flow is indicated by the arrows 17 in Fig. 1 with streamlined design only indicated in one. The openings are at an angle of agile manufacturing process as a cast part 45 ° to the generating line of the housing cylinder. For economical volume production, arrange so that it emerges from each of the openings an electric motor with a housing this the Teilströmc helically around the outer surface Kind of out of the question. In addition, the motor housing can be guided and thereby the knew device the flow rate of the air 60 entire housing is cooled. This training of the does not increase sensibly, since the limited surrounding motor fan housing allows this flow of the housing the contact time, while the housing consists of a deep-drawn cylindrical cup the air for heat exchange with the housing can be produced.