DE102019210485A1 - Blowers, in particular for air conditioners in the automotive sector, and air conditioners for the automotive sector with such a blower - Google Patents

Abstract

In the automotive sector, compact air conditioning units (HVAC Heating Ventilation Air Conditioning) are used, in which part of the cooling air is branched off into an engine cooling duct 20 in order to cool the drive motor 16 of the fan. The engine cooling duct 20 is delimited by a cooling duct wall 22, and the housing 4 of the fan 2 forms part of the cooling duct wall 22. Directly behind the cooling duct opening 18 there is a first wall element 26 that extends away from the inside of the cooling duct of the motor cooling duct 20 and at a free end 28 ends. The first wall element 26 prevents water droplets from reaching the electric motor 16 via the motor cooling duct 20. The air flow 21 in the engine cooling duct 20 can cause standing waves 32 to form, which lead to disruptive noises. A fan, in particular for air conditioning units in the automotive sector, and an air conditioning unit for the automotive sector with such a fan are specified, in which the air flow in the engine cooling duct 20 leads to less disturbing noises. A second wall element 34 between the first wall element 26 and the boundary wall 30 prevents the formation of standing waves with interfering frequencies in this area.

Description

Technical area

The present disclosure relates to a fan, in particular for air conditioning units in the automotive sector, and an air conditioning unit for the automotive sector with such a fan.

Compact air conditioners (HVAC Heating Ventilation Air Conditioning) are used in the automotive sector. The 5 and 6th show sectional views of a blower known from the prior art 2 , which is an essential part of such air conditioners, with a housing 4th that is a case inside 5 and a housing exterior 6th having. As shown in the sectional view in 5 can be seen is driven by a fan rotor 8th in the blower 2 a stream of air 10 via an air intake duct 12 sucked in and via an air exhaust duct 14th , which is part of the air ducts of the air conditioner, blown out. The fan rotor 8th is by an electric motor 16 driven that needs to be cooled. For this purpose branches off via a cooling duct opening 18th in the air outlet duct 14th an engine cooling duct 20th off, the cooling air 21st to the electric motor 16 leads. The engine cooling duct 20th is through a cooling duct wall 22nd limited, and the housing 4th of the fan 2 forms part of the cooling duct wall 22nd . Directly behind the cooling duct opening 18th is a first wall element 26th arranged that is from the inside of the cooling duct 23 of the engine cooling duct 20th stretching away and in a free end 28 ends. The first wall element 26th prevents water droplets over the engine cooling duct 20th to the electric motor 16 reach.

By the air flow in the engine cooling duct 20th can be located between the first wall element 26th and a boundary wall 30th that are part of the cooling duct wall 22nd is standing waves 32 train that lead to annoying noises.

It is therefore the object of the present invention to specify a fan and an air conditioning device with such a fan, in which the air flow in the engine cooling duct leads to less disturbing noises.

This object is achieved by the features of claims 1 and 10, respectively.

A second wall element between the first wall element and the boundary wall prevents the formation of standing waves with interfering frequencies in this area.

The advantageous embodiment according to claim 2 with multiple air flow deflections and breakthroughs in the floor element makes it more difficult for water droplets that roll off the first wall element to reach the electric motor. In addition, the result is a compact design, since the motor cooling duct is arranged directly on the outside of the housing of the fan.

The advantageous embodiment according to claim 3 makes it even more difficult for water droplets to penetrate the electric motor via the motor cooling duct.

The flat design of the wall elements simplifies their manufacture.

The advantageous embodiment according to claim 5 simplifies the production and shaping of the injection molded parts.

The dimensioning information according to claims 6 and 7 results in a particularly advantageous reduction in the disruptive noises due to standing waves with sufficient engine cooling air mass flow.

The advantageous embodiment according to claim 8 simplifies the production by means of easily demold injection molded parts. I.e. Injection molded parts without undercuts and with smooth and flat surfaces are used.

The embodiment according to claim 9 allows the engine cooling duct to be ventilated due to the pressure differences between the air exhaust duct and the motor cooling duct.

The fan according to the invention is preferably used in air conditioning units in the automotive sector.

Further details, features and advantages of the invention emerge from the following description of a preferred embodiment.

Figure list

• 1 shows an air conditioner with a fan and a distribution unit as used in the automotive sector;
• 2 shows a sectional view along the plane A - A in 1 ;
• 3 shows a sectional view along the plane B - B in 2 ;
• 4th FIG. 13 shows an enlarged sectional view along C - C in FIG 3 ;
• 5 shows a 3 corresponding to a sectional view according to the prior art; and
• 6th shows a 4th corresponding to a sectional view according to the state of the art.

Description of the embodiment

1 shows schematically an air conditioner 1 with a blower 2 and a distribution unit 3 how it is used in the automotive sector.

2 shows a sectional view along the plane A - A in 1 . The blower 2 has a housing 4th on the inside of the housing 5 and a housing exterior 6th having. By a fan rotor 8th in the blower 2 becomes a stream of air 10 via an air intake duct 12 sucked in and via an air exhaust duct 14th , please refer 3 , the part of the air conditioning ducts 1 is blown out. The air intake duct 12 is through a filter 13th covered. The fan rotor 8th is by an electric motor 16 driven that needs to be cooled. For this purpose branches off via a cooling duct opening 18th in the air outlet duct 14th an engine cooling duct 20th off, the cooling air 21st to the electric motor 16 leads - see 2 and 3 .

The engine cooling duct 20th is through a cooling duct wall 22nd limited, and the housing 4th of the fan 2 forms part of the cooling duct wall 22nd . Directly behind the cooling duct opening 18th is a first wall element 26th arranged that is from the inside of the cooling duct 23 of the engine cooling duct 20th stretching away and in a free end 28 ends. The first wall element 26th prevents water droplets over the engine cooling duct 20th to the electric motor 16 reach. To prevent getting between the first wall element 26th and a boundary wall 30th that are part of the cooling duct wall 22nd is standing waves 32 train, which lead to disturbing noises, is between the first wall element 26th and the boundary wall 30th a second wall element 34 arranged, which is also from the inside of the cooling duct 23 stretching away and in a free end 36 ends. As in 4th shown are the two wall panels 26th , 34 about the same length and their free ends 28 , 36 are at the same height. The second wall element is approximately centrally between the first wall element 26th and the boundary wall 30th arranged. In the specific embodiment shown, a particularly good noise suppression function of the second wall element was achieved by increasing the length of the second wall element 34 equal to the length of the first wall element 26th +/- 10% and the position of the second wall element 34 centrally between the first wall element 26th and the boundary wall 30th with a deviation of +/- 20%.

The two wall elements 26th , 34 are designed flat, which simplifies production. They can also be channel-shaped or wave-shaped in cross-section, provided they extend in a straight line towards the free end.

Under the two wall elements 26th , 34 becomes the engine cooling duct 20th by a floor element 38 limited. The floor element 38 points under the second wall element 34 a breakthrough 40 on and the engine cooling duct 20th continues through the breakthrough 40 through to the electric motor 16 away. The extension of the first wall element running vertically downwards 26th lies before the breakthrough in the direction of flow 40 . The direction of flow of the cooling air runs through this arrangement 21st in the engine cooling duct 20th in the area of the cooling duct opening 18th and in the area of breakthrough 40 across each other. The breakthrough 40 includes a border area 42 which forms a small step so that water drips outside the breakthrough 40 is effectively prevented by the breakthrough 40 to the electric motor 16 to get.

The case 4th and the engine cooling duct 20th are injection molded parts that are designed in two parts. The dividing line between the two parts runs along the plane D - D in 4th . The two-part design ensures that the injection molded parts can be demolded. Also due to the planar design of the cooling duct wall 22nd and the two wall elements 26th , 34 the demolding of the injection molded parts is made easier.

List of reference symbols

1

Air conditioner

2

fan

3

Distribution unit

4th

casing

5

Housing inside

6th

Housing outside

8th

Fan rotor

10

Airflow

12

Air intake duct

13

Filter on 12

14th

Air discharge duct

16

Electric motor

18th

Cooling duct opening

20th

Engine cooling duct

21st

Cooling air

22nd

Cooling duct wall

23

Cooling duct inside

24

Cooling duct outside

26th

first wall element

28

free end of 26th

30th

Boundary wall

32

standing waves

34

second wall element

36

free end of 34

38

Floor element

40

Breakthrough in 38

42

Border area of 40

Claims (10)

Blower (2), in particular for air conditioning devices (1) in the automotive sector, with a housing (4) which has an inside (5) and an outside (6) of the housing, an air intake duct (12) which leads into the housing (4), an air exhaust duct (14) which leads out of the housing (4), a fan rotor (8) which is rotatably arranged about an axis of rotation and which is arranged in the housing (4), an electric motor (16) as a drive for the fan rotor (8), a Motor cooling duct (20) which is delimited by a cooling duct wall (22) which has a cooling duct inside (23) and a cooling duct outside (24), the motor cooling duct (20 branching off from a cooling duct opening (18) in the air discharge duct (14) and for Electric motor (16) leads, a first wall element (26) in the motor cooling duct (20), which is arranged in the flow direction behind the cooling duct opening (18), which extends away from the cooling duct inside (23) and ends in a free end (28), and a boundary wall (30) in the Mot orkühlkanal (20) which is part of the cooling channel wall (22) and which is arranged behind the first wall element (26) when viewed from the cooling channel opening (18), characterized in that between the first wall element (26) and the delimiting wall (30) a second wall element (34) is arranged, which extends away from the cooling duct inside (23) and ends in a free end (36). Fan (2) Claim 1 , characterized in that the engine cooling duct (20) has a floor element (37) under the two wall elements (26, 36), that the floor element (37) has an opening (38), that the motor cooling duct (20) extends through the opening ( 38) continues through to the electric motor (16), so that the flow direction in the area of the cooling duct opening (18) runs transversely to the flow direction in the area of the opening (38), and that the opening (38) laterally to the first wall element (34) in the direction of the second wall element is arranged offset. Fan (2) Claim 2 , characterized in that the opening (38) comprises an edge region (40) which protrudes beyond the cooling channel inside (23) of the base element (37) in the direction of the two wall elements (34, 36). Fan (2) according to one of the preceding claims, characterized in that the two wall elements (26, 34) are flat. Fan (2) Claim 4 , characterized in that the two wall elements (26, 34) are arranged parallel to one another. Blower (2) according to one of the preceding claims, characterized in that the length (L2) of the second wall element (34) between the inside of the cooling duct (23) and the free end (36) of the length (L1) of the first wall element (26) between the inside of the cooling duct ( 23) and free end (28) corresponds to +/- 10%. Fan (2) according to one of the preceding claims, characterized in that the second wall element (34) is arranged in an area around the center between the first wall element (26) and the boundary wall (30) of +/- 20%. Blower (2) according to one of the preceding claims, characterized in that the housing and the motor cooling duct are injection-molded parts which are designed to be easily demolded. Blower (2) according to one of the preceding claims, characterized in that the cooling duct opening (18) penetrates a wall of the air discharge duct (14). Air conditioning device (1) for the automotive sector, characterized by a fan (2) according to one of the preceding claims.

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