DE102010009730B3 - Fluid conveying apparatus for circulating operating liquid in fluid circuits of motor car, has cabinets directly limited together, where fluid exchange between cabinets is optionally enable or not enabled - Google Patents

Abstract

The apparatus has two cabinets (1, 3) with two inlets (1a, 3a) and two outlets (1b, 3b), and primary and secondary running wheels (2, 4) rotatably supported on the cabinets. The wheels are acted with fluids from a primary cycle (5) and a secondary cycle (6). The primary wheel is movable in rotation by pressure difference between one of the inlets and outlets, and rotation of the primary wheel is transferred on the secondary wheel. The cabinets are directly limited together, where a fluid exchange between the cabinets is optionally enabled or not enabled.

Description

Fluid conveying device, in particular with turbine wheels designed to convert kinetic energy of the fluid flowing through into mechanical energy of a rotating shaft, and fluid circuit with such a fluid conveying device.

Such fluid delivery devices are used in motor vehicle construction to circulate operating fluids of the motor vehicle in fluid circuits.

The DE 198 24 006 A1 shows an oil pump and coolant pump of an internal combustion engine, wherein the oil pump and the coolant pump arranged one behind the other driven by a common drive wheel and can be used in a common recess of the crankcase of the internal combustion engine.

The WO 01/06101 A1 describes an engine with a fluid circuit consisting of several sub-circuits. A first partial circuit has for this purpose a first pump and a second partial circuit a second pump, which are drivable via a common drive shaft.

A disadvantage of the prior art shown is that the common drive shaft of the two interconnected pumps must be driven by a separate drive unit. As a result, the cost of providing the pumping units described are significantly increased and complicates the placement in the existing space.

The generic DE 199 39 314 A1 discloses a cryogenic liquid pump having a hydraulic motor powered by a pressurized drive fluid and driving an impeller for pumping the cryogenic fluid. The hydraulic motor has for this purpose a drive wheel, which is driven by the drive fluid and sits on a shaft on which the pump impeller is seated.

The disadvantage is that no fail-safe operation of the pump can be ensured because the blockade of one of the two wheels, by their arrangement on a common shaft, leads to a failure of the fluid delivery in both circuits.

The object of the present invention is therefore to provide a fluid delivery device and a fluid circuit, with the secondary pumping stages can be realized particularly cost-effective, with little space requirement and high reliability.

This object is solved by the features of patent claims 1 and 7.

A fluid delivery device has a first housing, with a first inlet and a first outlet, in which a primary impeller is rotatably mounted and at least one second housing, with a second inlet and a second outlet, in which a secondary impeller is rotatably mounted, wherein the primary impeller with Fluid from a primary circuit and the secondary impeller with fluid from a secondary circuit can be acted upon, wherein the primary impeller is displaceable by a pressure difference between the first inlet and first flow in rotation, wherein the rotation of the primary impeller is transferable to the secondary impeller, wherein the first housing and the second Enclosure directly adjacent to each other and wherein a fluid exchange between the first housing and the second housing is either possible or not possible.

By a primary impeller is rotatably mounted in a first housing and a secondary impeller rotatably supported in a second housing, wherein the rotation of the primary impeller is transferable to the secondary impeller, the resulting from the flow in the primary circuit pressure difference between the first inlet and first outlet can be used to simultaneously drive the secondary impeller via the primary impeller. As a result, a volume flow without the presence of a separate pump drive can be generated in the secondary circuit. Only a portion of the flow energy present in the primary circuit is transferred via the interacting wheels to the fluid in the secondary circuit. The volume flow in the primary circuit can be achieved for example by a fluid pump or by the thermosiphon effect. Since such a fluid delivery device without its own drive source can be made comparatively compact, a particularly flexible arrangement is possible. Of course, it is also possible to connect further secondary wheels in their own casings, which can be driven directly or indirectly by the primary impeller. The direct contacting of the first and second housing allows a particularly compact design of the fluid delivery device. Between the first and second housings, a fluid exchange may be either possible or not possible. Preferably, the fluid exchange takes place in the region of the passage openings of the shaft. In this way, if one of the two impellers blocks, there is the possibility of a fluid transfer which maintains a rudimentary function of the secondary circuit or of the primary circuit.

In a preferred embodiment, the primary impeller and the secondary impeller are rotatably connected to each other via a common shaft, optionally, the shaft may be subdivided by a transmission to produce different angular velocities of the wheels.

In a preferred embodiment, a first shaft portion is provided in the first housing and a second shaft portion is provided in the second housing, wherein the rotation of the first shaft portion is transferable to the second shaft portion by magnetic forces. In circuits with a particularly high pressure, it is advisable to dispense with the passage openings in the housings for the shaft and instead to use a non-contact transmission of the rotational movement by magnetic shaft sections in the respective housings.

In a preferred embodiment, the speed of the primary impeller and / or the secondary impeller is adjustable by a regulating member. By way of example, such a regulating member can bring about a regulation of the volume flow in the secondary circuit by detuning the quality of the secondary circuit. For this purpose, variable chokes are suitable, which can be controlled via active or passive actuators.

In a preferred embodiment, the secondary impeller has a smaller diameter than the primary impeller. If the secondary impeller is designed with a smaller diameter than the primary impeller, then the deliverable volume flow in the secondary circuit decreases with respect to the primary circuit.

A fluid circuit with a fluid delivery device according to the invention has a fluid pump arranged therein for generating a volume flow in the primary circuit. Such a fluid pump may preferably be designed as a centrifugal pump and driven by a belt drive or an electric motor.

In a preferred embodiment, the primary circuit, an engine and a main heat exchanger and the secondary circuit to a shut-off and / or a heat exchanger or a charge air cooler or an exhaust gas cooler, wherein the primary circuit and the secondary circuit are part of the fluid circuit. The primary circuit thus serves to dissipate heat from the engine, preferably the internal combustion engine, in that the fluid pump of the primary circuit delivers fluid from the internal combustion engine through a main heat exchanger. The primary impeller also located in the primary circuit is driven by the volume flow thus generated and also puts the connected secondary impeller in rotation. The secondary impeller generates in the secondary circuit, which is preferably designed as a so-called low-temperature circuit, a volume flow through a heating heat exchanger or a charge air cooler or an exhaust gas cooler, with a shut-off, preferably a thermostat, can interrupt the circulation in the secondary circuit by, for example, a bypass line to the second Housing opened around and the second inlet is closed. The secondary circuit is preferably operated at a temperature level which is lower than that of the primary circuit.

Further details, features and advantages of the invention will become apparent from the following description of a preferred embodiment with reference to the drawings.

Therein, the single figure shows a view of the fluid delivery device.

According to the figure, a fluid delivery device has a first housing 1 with a first feed 1a and a first course 1b , as well as at least one second housing 3 with a second feed 3a and a second process 3b , The two housings 1 and 3 In this case, they may optionally be spaced apart from one another or may rest so close to one another that they form a compact housing assembly. In the first case 1 is a primary wheel 2 rotatably mounted while in the second housing 3 a secondary wheel 4 is rotatably mounted. The primary impeller 2 and the secondary impeller 4 are through a wave 7 rotatably connected to each other, so that in the primary circuit 5 one in the first inflow 1a of the first housing 1 penetrating and out of the first drain 1b With lower pressure again emerging volume flow of fluid the primary impeller 2 set in rotation. The rotation of the primary rotor 2 transfers to the secondary rotor 4 which is in the secondary circuit 6 a volume flow of fluid through the second inlet 3a sucks and with higher pressure in the second sequence 3b again ejects. The wave 7 can by a not shown in the figure gear, which is the shaft 7 divides, which results in a different angular velocity and thus a different volume flow at primary impeller 2 and secondary impeller 4 can be generated. Alternatively, a different volume flow through different diameters of primary impeller can be 2 and secondary impeller 4 achieve.

LIST OF REFERENCE NUMBERS

1

first housing

1a

first feed

1b

first course

2

primary impeller

3

second housing

3a

second inlet

3b

second course

4

secondary impeller

5

Primary circuit

6

Secondary circuit

7

wave

Claims (8)

Fluid delivery device comprising a first housing ( 1 ), with a first feed ( 1a ) and a first process ( 1b ), in which a primary impeller ( 2 ) is rotatably mounted and at least one second housing ( 3 ), with a second feed ( 3a ) and a second process ( 3b ), in which a secondary impeller ( 4 ) is rotatably mounted, wherein the primary impeller ( 2 ) with fluid from a primary circuit ( 5 ) and the secondary impeller ( 4 ) with fluid from a secondary circuit ( 6 ) is acted upon, wherein the primary impeller ( 2 ) by a pressure difference between the first inlet ( 1a ) and first expiration ( 1b ) is rotatable and wherein the rotation of the primary impeller ( 2 ) on the secondary impeller ( 4 ) is transferable, characterized in that the first housing ( 1 ) and the second housing ( 3 ), directly adjacent to each other, wherein a fluid exchange between the first housing ( 1 ) and the second housing ( 3 ) optional or not possible. Fluid delivery device according to claim 1, characterized in that the primary impeller ( 2 ) and the secondary impeller ( 4 ) about a common wave ( 7 ) are rotatably connected to each other. Fluid delivery device according to claim 2, characterized in that the shaft ( 7 ) is divided by a transmission. Fluid delivery device according to one of claims 1 to 3, characterized in that in the first housing ( 1 ) a first shaft portion and in the second housing ( 3 ) A second shaft portion is provided, wherein the rotation of the first shaft portion is transferable by magnetic forces on the second shaft portion. Fluid delivery device according to one of claims 1 to 4, characterized in that the rotational speed of the primary impeller ( 2 ) and / or the secondary rotor ( 4 ) is adjustable by a Regulierorgan. Fluid delivery device according to one of claims 1 to 5, characterized in that the secondary impeller ( 4 ) has a smaller diameter than the primary impeller ( 2 ). Fluid circuit with a fluid delivery device according to claim 1, characterized in that in the primary circuit ( 5 ) is arranged a fluid pump for generating a volume flow. Fluid circuit according to claim 7, characterized in that the primary circuit ( 5 ) has an engine and a main heat exchanger and the secondary circuit ( 6 ) comprises a shut-off device and / or a heating heat exchanger or a charge air cooler or an exhaust gas cooler, wherein the primary circuit ( 5 ) and the secondary circuit ( 6 ) Are part of the fluid circuit.

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