EP0940565B1 - Water pump for the cooling circuit of an internal combustion engine - Google Patents

Description

The invention relates to a water pump for a Cooling circuit of an internal combustion engine according to the preamble of claim 1.

A water pump according to the preamble of claim 1 is known from DE 17 79 921 A. It is is a cooperating with a heating circulation pump Mixing valve. This is in an intake manifold, in the two other nozzles lead, a control body arranged in the form of a rotary valve, which about a planetary gear from an anchor of a Electric motor is driven.

It is for the cooling circuit of an internal combustion engine commonly known to use a water pump, wherein the control takes place via thermostats, which are temperature-dependent switch the cooling circuit. The drive The water pump can be mechanically controlled by one of the Internal combustion engine driven belt drive or also be made electrically. To the circuit of Coolant flows and the heating circuit are Timing valves, gate valves and rotary valves with stepper motor drives known from practice.

In DE 43 24 749 A1 discloses a control valve for a Cooling circuit described, with a radial inlet and three radial outlets, the distribution of the Coolant is done by a rotary valve.

The disadvantage of this control valve, however, is that one always resulting forces on the rotary valve, which can lead to jamming and / or accordingly strong drive motors for its adjustment make necessary. In addition, the adjustment or mixed positions limited.

From DE 41 25 366 C1 is a 3/2-way valve for Fluid circuits known in vehicles, with a axial inlet and two radial discharges. Also with this valve, the setting options are limited, so that the control or regulation of a Cooling and heating circuit even more facilities required are.

From DE 44 38 552 C1 is a temperature control device for the cooling circuit of an internal combustion engine described which with actuators for a switching flap arranged on a switching shaft is provided. The switching valve shaft lies in the Area of an imaginary wall line of the radiator return line or pump supply and in the junction area the short-circuit line in the pump supply line. For operation the switching flap is a temperature expansion element, a so-called wax cartridge, provided.

The present invention is based on the object a control device for the cooling circuit a To create internal combustion engine, which in a very compact design several links of the cooling circuit and several functions of setting and switching elements includes.

According to the invention this object is achieved by the in the claim 1 mentioned features solved.

Due to the integration of the control valve according to the invention in the housing of the water pump becomes a very compact Achieved component, while at the same time by the Control valve with appropriate design several Switch positions are feasible, so that in case of need more control elements in a cooling and optionally a heating circuit of an internal combustion engine can be omitted. Not only can the various functions or switching positions but can also be realized the mechanical parts necessary for a control be received in the pump housing or accordingly be flanged to the pump housing.

With the embodiment of the invention can be practical with a single device the entire circuit to Cooling and possibly also for heating for almost all cases occurring in practice are regulated. With the control valve are both individual openings controllable as well as mixed operations possible, so that to other control and regulating members in the cooling and heating circuit can be waived.

Due to the design of the control valve as a rotary valve with the axial supply or discharge of the cooling medium and the inlet or outlet openings on the circumference The pump housing results in no resulting Forces on the rotary valve, so that one with small Setting and holding forces for the rotary valve manages. In addition, occur in the control valve only small Pressure losses on, at the same time high speeds.

The axial opening in the rotary valve is used for supply of cooling medium in its interior when the Rotary slide on the pressure side of the pumping device is arranged, in which case in the peripheral wall the pump housing arranged openings Outlet openings for forwarding the cooling medium represent.

Conversely, if the rotary valve on the suction side of the Pumping device is arranged, the discharge takes place from cooling medium through the axial opening to the suction side the pump and, correspondingly, a supply to the rotary valve interior over the control opening through in the Peripheral wall of the pump housing arranged openings.

One possible embodiment when using a Actuator for the rotary valve is that next to the partial circuit for the radiator line another Partial circuit for a short circuit circulation line and a third subcircuit for a heat exchanger a heating circuit are provided. Alternatively or in combination can also be a partial cycle for an additional heater and / or an exhaust heat exchanger be provided.

In the remaining subclaims and in the following Based on the drawing principle described embodiment are advantageous developments and Embodiments of the invention shown.

Fig. 1

eine Darstellung der erfindungsgemäßen Wasserpumpe, teilweise im Schnitt;

Fig. 2

eine perspektivische Darstellung der Wasserpumpe nach Fig. 1;

Fig. 3

einen schematischen Querschnitt durch das in die Wasserpumpe integrierte Stellventil; und

Figuren 4 bis 7

verschiedene Steuerstellungen des Stellventiles.

It shows:

Fig. 1

an illustration of the water pump according to the invention, partly in section;

Fig. 2

a perspective view of the water pump of Fig. 1;

Fig. 3

a schematic cross section through the integrated into the water pump control valve; and

FIGS. 4 to 7

various control positions of the control valve.

The water pump shown in the figures is basically of known type, which is why only to the essential parts of the invention in more detail will be received. Thus, the water pump may e.g. as Pumping device arranged in a pump housing 1 Centrifugal pump with one in a spiral channel 2 be arranged impeller 3. The impeller 3 is in known manner by a drive motor 4 driven. Alternatively to the drive via the drive motor 4 is also a mechanical drive over one of the Internal combustion engine driven belt drive, e.g. With a V-belt, conceivable for the water pump.

In an axial extension of the pump housing 1 and in the range of the usual existing feed to the impeller 3 of the water pump is a control valve 5 arranged with a rotary valve 6 in sleeve form, wherein the longitudinal axis of the rotary valve coaxial with Pump longitudinal axis and the impeller 3 is located. A axial collecting opening 7 of the rotary valve 6 forms a Inlet opening to the impeller 3 of the water pump. A with a radiator not shown connected cooler line 8 opens with an inlet opening 9 in the Peripheral wall of the pump housing 1.

As can be seen from FIGS. 3 to 7, FIG Peripheral wall of the pump housing 1 additionally with two further inlet openings 10 and 11 are provided, the for further partial circuits of the cooling medium in the Cooling circuit are provided. On the from the collection port 7 side facing away from the rotary valve. 6 closed on the front and on this side too with a servomotor 12 for rotating the rotary valve Provided.

The rotary valve 6 is in its peripheral wall with a Control opening 13 provided. About the control port 13 takes place in dependence on the rotational position of the rotary valve 6 a connection from the inlet opening 9, 10 or 11 to the collection port 7 and thus a connection to the suction side of the impeller 3 of the water pump.

As can be seen from FIGS. 3 to 7, according to the rotational position of the rotary valve 6 - different operating positions possible and not only single flows, but also mixed operating flows. For this purpose has the collecting port 13 in the Circumferential wall of the rotary valve 6 such an opening width, that both individual flows as well Mixed operating flows are possible.

According to FIG. 3, the following conditions must be fulfilled for this: δ <γ - ( φ n 2 + φ m 2 )

γ Öffnungswinkel des Drehschiebers

δ Winkel zwischen den Stutzen

ϕ Winkelöffnung der Anschlußstutzen

β freigeschalteter Öffnungswinkel des entsprechenden Stutzens

Where:

γ opening angle of the rotary valve

δ angle between the sockets

φ angular opening of the connecting piece

β unlocked opening angle of the corresponding nozzle

δ ₁ + δ ₂ + δ ₃ = 360 °, where the individual angles should be chosen as equal as possible
β _max = φ full opening of the cross section

In Fig. 3, the angles by means of sectional representation represented by the center plane of the connection cross sections. All angles are directly related with the cross-section functions. In addition to the relatively simple form of a hole for the openings You can also choose other, non-circular cross sections become. That way you can have another one Degree of freedom in determining the positioning behavior to reach.

In the illustrated embodiment, go Connecting piece radially from the pump housing 1 from. Around achieving a streamlined shape is it also possible the connection piece half-axial or against the Radiale inclined to attach to the pump housing 1.

In Figures 4 to 7 are different control positions the control device 1 shown. So shows Fig. 4 shows the position in normal operation "cooling". In the Fig. 5 is a first mixing operation in the warm-up phase of the engine during simultaneous heating operation, wherein the inlet opening 9 of the radiator line shut off and the inlet openings 10 and 11 for the Short circuit circulation line and for the heating circuit are open. Fig. 6 shows a second mixing operation in the phase "warm-up and cooling", where the heating circuit is shut off.

FIG. 7 shows a third mixing operation in FIG Phase "heating and cooling", wherein the inlet opening 10th is shut off for the short circuit circuit line.

According to the operation shown in FIG. 4, are also in case of need other single connections from the control port 13 of the rotary valve 6 to a single circumferential opening possible.

Instead of the heating circuit can also be a second Short circuit, e.g. for the cylinder head, provided his.

As can be seen, the rotary valve 6 can be any circuit switch separately. In addition, between each two circuits set any mixing stages his.

At the control valve 5, there are no resulting flow forces which is a moment about the axis of rotation of the Rotary valve 6 would produce. This means changes the rotary valve position due to a flow are not possible, which is why the drive power kept correspondingly low for the servo motor 12 can be. Due to the low restoring forces is in Normally, no special storage of the rotary valve 6 required. Because in every angular position Cross sections are unlocked in the radial direction, also occur only very low pressure drops above the control device, bringing special seals the individual inflows and outflows are eliminated can.

In the illustrated embodiment are all three inlet openings 9, 10 and 11 in the same radial plane, which achieves a very short construction length becomes.

A circumferential opening can also be used as a partial circuit for an additional heater or an exhaust gas heat exchanger provided his. Also combinations of different subcircuits are self-evident in the context of the invention possible.

As can be seen from the embodiment is not only the entire control valve in the pump housing 1 of Water pump integrated, but the same applies to one electrical and also an electronic interface, wherein via the electrical interface a central Power supply of the water pump and the servomotor 12 is provided from the electrical system. An electronic Interface serves as a central connection for a data exchange, for setpoint specifications and for another exchange of information. You can do this the two interfaces in a common housing 14 sitting on the pump housing 1 and the drive motor 4 is flanged.

By integrating the control valve in the pump housing 1 offers the possibility of the flow all important partial flows in a cooling circuit turn. By the integration is also continued a compact, cost-saving and reliable design a central working and control organ for the vehicle repair possible. A regulatory organ for The speed of the water pump is thus about the control function extended for the control valve 5.

1. eine wasserseitige Regulierung der Temperatur in dem Kühlkreislauf

2. eine Applikation dieser Regelung für alle am Stellventil 5 angeschlossene Teilkühlmittelströme.

The solution according to the invention combines two essential features of a cooling system, namely:

1. a water-side regulation of the temperature in the cooling circuit

2. an application of this rule for all connected to the control valve 5 subcoolant streams.

In particular, with a variable speed electrical Water pump and a via the servo motor 12 electrically driven control valve 5 can be a precise temperature reach from all subcircuits. For this you will also be appropriate Temperaturmeßstellen for the regulation of the pump and the cooling circuit in the Integrate water pump.

Claims (12)

1. A water pump for the cooling circuit of an internal combustion engine in a motor vehicle having a pump housing (1) and a driven pump device in the pump housing (1), a control valve (5) with a rotary slide valve (6) being integrated in the pump housing (1) and the rotary slide valve (6) having at least approximately the shape of a sleeve and being provided with an axial collecting opening (7) for the supply or removal of coolant to/from the inlet or delivery side of the pump device (3),
   characterised in that
   provided in the peripheral wall of the pump housing (1) are feed/discharge openings (9, 10, 11) for a radiator line (8) which can be connected to the radiator and for two or more further partial circuits, the rotary slide valve (6) having a control opening (13) in its peripheral wall with an opening width through which is created a connection from the collecting opening (7) to a single feed/discharge opening (9, 10, 11) or, for mixed operation, an overlapping connection to two feed/discharge openings (9, 10, 11) positioned adjacent to one another, and an electrical interface for a central power supply from the mains and an electronic interface for a central connection for data exchange, pre-determined set points or for further information exchange being provided in or on the pump housing (1).
2. A water pump in accordance with claim 1,
   characterised in that
   the two interfaces are positioned in a common housing (14) which is flanged to the pump housing (1).
3. A water pump in accordance with one of claims 1 or 2,
   characterised in that
   the rotary slide valve (6) is provided with a servomotor (12).
4. A water pump in accordance with one of claims 1 to 3,
   characterised in that
   the second part circuit (10/11) is provided for a short circuit line for the coolant.
5. A water pump in accordance with one of claims I to 4,
   characterised in that
   the third part circuit (10) is provided for a heating circuit.
6. A water pump in accordance with one of claims 1 to 3,
   characterised in that
   the second or third part circuit (10/11) is provided for an additional heating system and/or an exhaust gas heat exchanger device.
7. A water pump in accordance with one of claims 1 to 6,
   characterised in that
   the feed/discharge openings (9, 10, 11) lie in the same radial plane of the pump housing (1).
8. A water pump in accordance with claim 7,
   characterised in that
   the angular distances between the feed/discharge openings (9, 10, 11) are distributed evenly around the periphery of the pump housing (1).
9. A water pump in accordance with one of claims 1 to 7,
   characterised in that
   connectors branch off the feed/discharge openings (9, 10, 11) at an angle inclined relation to the radials.
10. A water pump in accordance with one of claims 1 to 9,
    characterised in that
    it can be driven electrically by a drive motor (4).
11. A water pump in accordance with one of claims 1 to 9,
    characterised in that
    it can be driven mechanically by a belt drive driven by the internal combustion engine.
12. A water pump in accordance with one of claims 1 to 11,
    characterised in that
    the pump device is designed as a centrifugal pump.

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