DE102020100362A1 - Water pump with a second inlet and motor vehicle with such a water pump - Google Patents

Abstract

The invention relates to a water pump (14) for a motor vehicle, with at least one pump wheel (18) designed to convey the coolant, in order to suck in coolant from a first inlet (15) and a separate, second inlet (17) and at an outlet (22 ) to eject; a first inlet channel (23) extending from the first inlet (15) to the pump wheel (18), and a drive device (29) for driving the pump wheel (18), the drive device (29) surrounding the first inlet channel (23). The invention also relates to a motor vehicle with such a water pump (14).

Description

The invention relates to a water pump for a motor vehicle. The invention also relates to a motor vehicle with such a water pump.

From the prior art, water pumps with a single inlet and a single outlet are known, such as from US Pat DE 10 2016 219 273 A1 .

Such water pumps have the disadvantage that they are structurally difficult to integrate in the engine compartment of a motor vehicle. 1 shows schematically an integration of such a water pump from the prior art in an engine cooling circuit 1 a large cooling circuit can be formed in which an internal combustion engine 1 , a thermostatic valve 2 , a cooler 3 as well as the water pump 4th be flowed through by coolant. The reference number 5 indicates the connection from the cooler 3 to the water pump 4th . From the water pump 4th the coolant flows back to the internal combustion engine 1 . A small cooling circuit can also be created in which the coolant is downstream of the thermostatic valve 2 over the connection 6th directly to the water pump 4th flows. So it will be the connections 5 and 6th upstream of the water pump 4th merged and introduced into the same inlet. It is unfavorable that the coolant lines for the connection 5 around the water pump 4th have to be led around, which leads to a pressure loss at the water pump inlet. Coolant lines to the water pump have to overcome deflections that are unfavorable in terms of flow. This can lead to an increase in pressure loss and, in the worst case, to damage to the pump impeller due to the increased tendency to cavitation.

It is therefore an object of the present invention to at least partially eliminate the above-mentioned disadvantages. This object is achieved by a water pump according to claim 1 and a motor vehicle according to claim 11. Advantageous further developments of the invention are the subject of the dependent claims.

According to an exemplary embodiment of the invention, a water pump for a motor vehicle is provided, with at least one pump wheel designed to convey the coolant in order to suck in coolant from a first inlet and a separate, second inlet and to expel it at an outlet; a first inlet channel, which extends from the first inlet to the pump wheel, and a drive device for driving the pump wheel, wherein the drive device surrounds the first inlet channel. This offers the advantage that a more flexible line routing of a coolant circuit is made possible by two inlets of the water pump. As a result, fewer bends in the line routing are required, which leads to a reduction in pressure losses at the inlets of the water pump.

According to a further exemplary embodiment of the invention, the impeller has a first impeller and a second impeller, which are arranged next to one another or formed in one piece, the first impeller being assigned to the first inlet and the second impeller being assigned to the second inlet. Because each inlet is assigned its own impeller, a higher delivery rate can be achieved.

According to a further exemplary embodiment of the invention, the first inlet and the second inlet are arranged on opposite sides of the impeller. This is advantageous with regard to the routing of the coolant circuit.

According to a further exemplary embodiment of the invention, the drive device comprises a stator and a rotor of an electric motor, the stator and the rotor each ring-shaped surrounding the first inlet channel.

According to a further exemplary embodiment of the invention, the water pump also has power electronics which surround the first inlet channel.

According to a further exemplary embodiment of the invention, the drive device comprises a drive wheel, in particular a belt wheel, a gear wheel which surrounds the first inlet channel.

According to a further exemplary embodiment of the invention, the drive wheel is mounted on the first inlet channel.

According to a further exemplary embodiment of the invention, the water pump is provided with a second inlet channel which extends from the second inlet to the pump wheel.

According to a further exemplary embodiment of the invention, the longitudinal directions of the first and second inlet channels are congruent or parallel to one another, the first and second inlet channels being arranged on opposite sides of the pump wheel.

According to a further exemplary embodiment of the invention, the water pump is furthermore provided with an impeller axle on which the impeller is rotatably mounted, the impeller axle being connected to an inner side of the first or second inlet channel.

In addition, the present invention provides a motor vehicle with such a water pump.

• 1 zeigt schematisch einen Motorkühlkreislauf gemäß dem Stand der Technik;
• 2 zeigt schematisch einen Motorkühlkreislauf gemäß einem Ausführungsbeispiel der Erfindung, und
• 3 zeigt schematisch eine Wasserpumpe gemäß einem Ausführungsbeispiel der Erfindung.

A preferred embodiment of the present invention is described below with reference to the accompanying drawings. These drawings show:

• 1 shows schematically an engine cooling circuit according to the prior art;
• 2 shows schematically an engine cooling circuit according to an embodiment of the invention, and
• 3 shows schematically a water pump according to an embodiment of the invention.

2 shows schematically an engine cooling circuit according to an embodiment of the invention. The engine cooling circuit is adapted to have a coolant flowing through it, for example water to which additives have been added. The engine cooling circuit has a radiator cooling circuit in which an internal combustion engine 10 , a thermostatic valve 11 , a cooler 12th , a first lead 13th as well as a water pump 14th are arranged in series, that is, the coolant can flow through them in series. The cooler cooling circuit leads through a first inlet 15th the water pump 14th in these. Downstream of the water pump 14th the radiator cooling circuit leads back to the combustion engine 10 . In addition, the engine cooling circuit has a bypass cooling circuit in which the internal combustion engine 10 , the thermostatic valve 11 and the water pump 14th in series, bypassing the cooler 12th are permeable. Here, too, the bypass cooling circuit runs downstream of the water pump 14th back to the internal combustion engine 10 . In the bypass cooling circuit leads downstream of the thermostatic valve 11 bypassing the cooler 12th a second supply line 16 from the thermostatic valve 11 via a second inlet 17th the water pump 14th in these. As in the schematic representation of the 2 , in comparison to 1 , can be recognized by the presence of two inlets in the water pump 14th , namely the first inlet 15th and the second inlet 17th allows a more advantageous line routing, which with fewer bends, in particular in the area of the first supply line 13th , gets by.

3 shows schematically the water pump 14th according to an embodiment of the invention. The water pump 14th has an impeller 18th , which can be rotated on an impeller axle 19th is stored. The impeller 18th has two impellers in the illustrated embodiment 20th , 21 that are arranged directly next to each other, in particular contact each other. The impellers 20th , 21 are designed in particular mirror-symmetrically, with a normal plane to the pump wheel axis 19th forms the plane of symmetry. The impeller 18th is designed such that there is a fluid, in particular a liquid, from the first inlet 15th and from the second inlet 17th sucks in and at an outlet 22nd ejects. In particular is the impeller 20th designed in such a way that there is the fluid, in particular the liquid, from the first inlet 15th suction and at the outlet 22nd ejects. In particular is the impeller 21 designed such that there is the fluid, in particular the liquid, from the second inlet 17th suction and at the outlet 22nd ejects. So there are at least two inlets 15th , 17th as well as a single outlet 22nd available. The impellers 20th , 21 are designed in such a way that they lead to the inlets 15th , 17th are open and have a closed wall on the facing sides.

The inlets 15th , 17th are in particular on opposite sides of the impeller 18th arranged, in particular are the inlets 15th , 17th on an imaginary extension of an axis of rotation of the impeller 18th .

Between the first admission 15th and the impeller 20th is a first inlet port 23 formed, which from the first inlet 15th to the open side of the impeller 20th leads. Between the second inlet 17th and the impeller 21 is a second inlet port 24 formed, which from the first inlet 17th to the open side of the impeller 21 leads. Between the impeller 18th and the outlet 22nd is an exhaust port 25th educated. The first and the second inlet port 23 , 24 are in particular formed in a straight line, in particular the longitudinal axes correspond to the inlet channels 23 , 24 the axis of rotation of the impeller 18th . In particular, the first and second inlet ducts 23 and 24 designed in the form of tubes.

The impeller axle 19th is via one or more webs 26th on the inside of the first inlet port 23 attached and fixed. In particular, is the impeller axis 19th attached at one end only, viewed along its longitudinal direction. The treads 20th , 21 are about appropriate bearings 27 , 28 , especially roller bearings, on the impeller axle 19th stored.

Around the first intake port 23 around is a drive device 29 arranged, in particular surrounds the drive device 29 the first inlet port 23 closed ring-like, so that the first inlet port 23 by the drive device 29 extends therethrough. The drive device 29 is with the impeller 18th rotatably coupled so that the impeller 18th by the drive device 29 is drivable. The drive device 29 can for example be a stator 30th as well as a rotor cooperating with this 31 an electric motor exhibit. In this case it is the impeller 18th with the rotor 31 coupled. In this way, a purely electrically driven or a partially electrically driven water pump can be formed. Additionally or alternatively, the drive device 29 have a drive wheel, for example a belt wheel or a gear. In this way, a mechanically driven or partially mechanically driven water pump can be formed. The drive device 29 is at least partially by means of bearings 33 and 34 on an outside of the inlet duct 31 rotatably mounted. In the case of an electric motor, the rotor is 31 by means of the bearings 33 and 34 on an outside of the inlet duct 31 rotatably mounted. In the case of a drive wheel, this drive wheel is on the outside of the inlet channel by means of one or more bearings 31 rotatably mounted.

Furthermore, around the first inlet channel 23 around, for example next to the drive device 29 , a power electronics 32 be arranged, in particular surrounds the power electronics 32 the first inlet port 23 closed ring-like, so that the first inlet port 23 through power electronics 32 extends therethrough. The power electronics 32 is adapted to the electric motor of the drive device 29 to be supplied with electrical energy.

While the invention has been illustrated and described in detail in the drawings and the foregoing description, such illustration and description are to be regarded as exemplary in nature and not as restrictive, and it is not intended to limit the invention to the embodiment disclosed. The mere fact that certain features are mentioned in different dependent claims is not intended to imply that a combination of these features could not also be used to advantage.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102016219273 A1 [0002]

Claims (11)

Water pump (14) for a motor vehicle, with at least one pump wheel (18) designed to convey the coolant in order to suck in coolant from a first inlet (15) and a separate, second inlet (17) and to expel it at an outlet (22); a first inlet channel (23) extending from the first inlet (15) to the impeller (18), and a drive device (29) for driving the pump wheel (18), the drive device (29) surrounding the first inlet channel (23). Water pump (14) according to Claim 1 , wherein the pump wheel (18) has a first impeller (20) and a second impeller (21) which are arranged next to one another or formed in one piece, the first impeller (20) being assigned to the first inlet (15) and the second impeller ( 21) is assigned to the second inlet (17). Water pump (14) according to one of the preceding claims, wherein the first inlet (15) and the second inlet (17) are arranged on opposite sides of the pump wheel (18). Water pump (14) according to one of the preceding claims, wherein the drive device (29) comprises a stator (30) and a rotor (31) of an electric motor, the stator (30) and the rotor (31) each ring-shaped the first inlet channel (23 ) surround. Water pump (14) according to one of the preceding claims, further comprising power electronics (32) which surround the first inlet channel (23). Water pump (14) according to one of the preceding claims, wherein the drive device (29) comprises a drive wheel which surrounds the first inlet channel (23). Water pump (14) according to Claim 6 , wherein the drive wheel is mounted on the first inlet channel (23). Water pump (14) according to one of the preceding claims, with a second inlet channel (24) which extends from the second inlet (17) to the pump wheel (18). Water pump (14) according to Claim 8 wherein the longitudinal directions of the first and second inlet ducts (23, 24) are congruent or parallel to one another, and wherein the first and second inlet ducts (23, 24) are arranged on opposite sides of the impeller (18). Water pump (14) according to Claim 8 or 9 , further with an impeller axle (19) on which the impeller (18) is rotatably mounted, the impeller axle (19) being connected to an inner side of the first or second inlet channel (23, 24). Motor vehicle with a water pump (14) according to one of the Claims 1 to 10 .

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