Intake charged pump for delivering a liquid

Abstract

An intake charged pump for pumping liquid and which has an intake duct that extends to the suction area of the pump. The pump has a duct through which a jet stream flows to the suction area. A nozzle arrangement in the intake duct accelerates the liquid which is returned via the jet stream and supports the suction of a suction stream of the liquid from a storage container. A nozzle of the nozzle arrangement leads into the mixing chamber at an acute angle in a such way that the jet stream, leaving the nozzle, creates a common mixing stream with the suction stream from the storage container, and through which partial streams having essentially the same pressure and energy content, can be delivered to the front and back suction pockets of the double chamber pump.

Claims

1. An intake charged double chamber vane cell pump (1) for delivering a liquid to a motor vehicle, the intake charged pump (1) comprising: a housing (2) with an inner space (3) located therein, a pump rotor is arranged within the inner space of the housing and rotates about a rotational axis, an intake duct for the liquid extending to first and second inlets (18, 19) of the pump, a pressure area (11, 12) of the pump being linked to a pressured duct (9) through which a jet stream (10), from the pressure area (11, 12), is transported to the first and the second inlets (18, 19) of the pump, a nozzle configuration (13, 14), in the intake duct, for accelerating the liquid which is returned with the jet stream (10) and for supporting suction of a suction stream (8) of the liquid from a storage container, the intake duct being positioned in a front of the housing (2) of the pump (1) and designed as a cylindrical mixing chamber (6) so that the suction stream (8) is injected into the cylindrical mixing chamber (6), the cylindrical mixing chamber defines a chamber longitudinal axis which is directed tangentially to the inner space of the housing and offset from the rotational axis of the pump rotor, a nozzle (13) of the nozzle configuration (13, 14) having an output end that is spaced, along the chamber longitudinal axis, upstream of and apart from the cylindrical mixing chamber by an axial distance, the nozzle leading into the cylindrical mixing chamber (6) at an acute angle in a way so that the jet stream (10), exiting from the nozzle (13), creates a common mixing stream (15) with the sucked in suction stream (8) from the storage container, through which, to one of a front suction pocket (4) at the first inlet and a back suction pocket (5) at the second inlet of the double chamber pump (1), in each case, a respective partial stream (16, 17), having a common pressure and a common same energy content, being delivered, and the front and the back suction pockets (4, 5) are each designed as pairs at each side of the housing (2) of housing lids (21) and the nozzle (13) has a radially inner shell surface (27) that is asymmetrical with respect to the nozzle longitudinal axis.

2. The pump according to claim 1, wherein starting at the cylindrical mixing chamber (6), the housing (2) has the first inlet (18) to the front suction pocket (4) and the second inlet (19) to the back suction pocket (5), the front and the back suction pockets (4, 5) are positioned diametrically opposite one another in the pump, and the back suction pocket (5) is connected, via a ring duct (20), with the cylindrical mixing chamber (6).

3. The pump according to claim 1, wherein the nozzle (13) is arranged to direct the jet stream into the cylindrical mixing chamber (6) which mixes the jet stream with the suction stream to create the common mixing stream and causes the common mixing stream to divide into a first respective partial stream (16), which flows to the front suction pocket (4), and a second respective partial stream (17), which flows through the back suction pocket (5), the second respective partial stream is brought at an inner wall of the cylindrical mixing chamber (6) to a ring duct (20) that extends, radially around the rotational axis of the pump rotor, and to the back suction pocket (5).

4. The pump according to claim 1, wherein a longitudinal axis (22) of the nozzle (13) is tilted in at least one of a vertical and a horizontal longitudinal sectional plane (A, B) at an angle (a) of approximately 15° to 45° with respect to the chamber longitudinal axis (23) of the cylindrical mixing chamber (6).

5. The pump according to claim 4, wherein an inlet of the nozzle (13) is positioned in the vertical longitudinal sectional plane (A), with respect to the chamber longitudinal axis (23) of the cylindrical mixing chamber (6), at an axis deviation of approximately 15% to 25% of a diameter of the cylindrical mixing chamber (6).

6. The pump according to claim 1, wherein a longitudinal axis (22) of the nozzle (13) is tilted in at least one of a vertical and a horizontal longitudinal sectional plane (A, B) at an angle (α) of approximately 15° to 20° with respect to the chamber longitudinal axis (23) of the cylindrical mixing chamber (6).

7. The pump according to claim 1, wherein the nozzle (13) defines a nozzle longitudinal axis and has an inlet, the nozzle is positioned with respect to the chamber longitudinal axis (23) of the cylindrical mixing chamber (6) such that the nozzle longitudinal axis at the inlet of the nozzle is spaced from the chamber longitudinal axis of the cylindrical mixing chamber by a distance that is approximately 15% to 20% of a diameter of the cylindrical mixing chamber (6).

8. An intake charged double chamber vane cell pump (1) for delivering a liquid to a motor vehicle, the intake charged pump (1) comprising: a housing (2) with an inner space (3) located therein, a pump rotor is arranged within the inner space of the housing and rotates about a rotational axis, an intake duct for the liquid extending to first and second inlets (18, 19) of the pump, a pressure area (11, 12) of the pump being linked to a pressured duct (9) through which a jet stream (10), from the pressure area (11, 12), is transported to the first and the second inlets (18, 19) of the pump, a nozzle configuration (13, 14), in the intake duct, for accelerating the liquid which is returned with the jet stream (10) and for supporting suction of a suction stream (8) of the liquid from a storage container, the intake duct being positioned in a front of the housing (2) of the pump (1) and designed as a cylindrical mixing chamber (6) so that the suction stream (8) is injected into the cylindrical mixing chamber (6), the cylindrical mixing chamber defines a chamber longitudinal axis which is directed tangentially to the inner space of the housing and offset from the rotational axis of the pump rotor, a nozzle (13) of the nozzle configuration (13, 14) having an output end that is spaced, along the chamber longitudinal axis, upstream of and apart front the cylindrical mixing chamber by an axial distance, the nozzle leading into the cylindrical mixing chamber (6) at an acute angle in a way so that the jet stream (10), exiting from the nozzle (13), creates a common mixing stream (15) with the sucked in suction stream (8) from the storage container, through which, to one of a front suction pocket (4) at the first inlet and a back suction pocket (5) at the second inlet of the double chamber pump (1), in each case, a respective partial stream (16, 17), having a common pressure and a common same energy content, being delivered, and the nozzle configuration (13, 14) comprises of a carrier plate (14), and the nozzle (13) is either embedded or designed into the carrier plate, and the carrier plate (14) is either: a component of a suction filter enclosure (7), or is fixed at an output of the pressure duct (9) within a holding groove (26) of the suction filter enclosure (7).

9. An intake charged pump (1) for delivering a liquid to a motor vehicle, the intake charged pump (1) comprising: a housing (2) with an inner space (3) located therein, an intake duct for the liquid extending to an intake area (18, 19) of the pump, a pressure area (11, 12) of the pump being linked to a pressured duct (9) through which a jet stream (10), from the pressure area (11, 12), is transported to the intake area (18, 19) of the pump, a nozzle configuration (13, 14), in the intake duct, for accelerating the liquid which is returned with the jet stream (10) and for supporting suction of a suction stream (8) of the liquid from a storage container, the intake duct being positioned in a front of the housing (2) of the pump (1) and designed as a cylindrical mixing chamber (6) so that the suction stream (8) is injected into the mixing chamber (6), a nozzle (13) of the nozzle configuration (13, 14) leading into the mixing chamber (6) at an acute angle in a way so that the jet stream (10), exiting from the nozzle (13), creates a common mixing stream (15) with the sucked in suction stream (8) from the storage container, through which, to one of a front suction pocket (4) and a back suction pocket (5) of the double chamber pump (1), in each case, a respective partial stream (16, 17), having a common pressure and a common same energy content, being delivered, and the nozzle (13) defining a nozzle longitudinal axis (22) and having a radially inner shell surface (27) that is asymmetrical with respect to the nozzle longitudinal axis.

10. An intake charged pump (1) of a motor vehicle for delivering a liquid, the pump comprising: a housing (2) enclosing an inner space (3) that has an at least substantially circular cross section and defines a rotational axis about which a pump rotor is rotatable, and a fluid intake duct extending to intake areas (18, 19) of the pump; a pressure area (11, 12) of the pump being linked to a pressured duct (9) through which a jet stream (10) from the pressure area (11, 12) being directed toward the intake areas (18, 19) of the pump; a nozzle configuration (13, 14) being arranged in the fluid intake duct for accelerating the liquid returning in the jet stream (10) and enhancing flow of a suction stream (8) of the liquid from a storage container; the intake duct being positioned in front of the housing (2) of the pump (1) and designed as a cylindrical mixing chamber (6) which defines a longitudinal axis that is directed tangentially with respect to a circumference of the inner space of the housing and offset from the rotational axis, and the flow of the suction stream (8) being directed into the mixing chamber (6); a nozzle (13) of the nozzle configuration (13, 14) conducting the jet stream (10) into the mixing chamber (6) at an acute angle for mixing with the suction stream from the storage container and forming a common mixing stream (15), the nozzle directing a first partial stream to a front intake pocket (4) and a second partial stream to a back suction pocket (5) such that, at the respective front and the rear intake pockets, the first and the second partial streams being at substantially equal pressures and have substantially equal energy contents; and the nozzle configuration (13, 14) comprises a carrier plate (14), and the nozzle (13) is either embedded or designed into the carrier plate, and the carrier plate (14) is either: a component of a suction filter enclosure (7), or is fixed at an output of the pressure duct (9) within a holding groove (26) of the suction filter enclosure (7).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the following, the invention is further explained based on the embodiment example presented in the drawing. The drawing shows in

(2) FIG. 1 a schematic side sectional view of an intake charged dual-flow pump illustrating a jet stream injected to the pump, the intake suction stream, a mixing stream and the partial streams directed to the front and back suction pockets,

(3) FIG. 2 an enlarged vertical longitudinal sectional view of a mixing chamber and a nozzle arrangement in the same, and

(4) FIG. 3 a sectional view through the upstream end of the mixing chamber and the nozzle of the nozzle arrangement facing in the direction of the mixing chamber.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(5) Of a dual flow, intake charged vane cell pump 1 for transporting liquid, in FIG. 1, only a housing 2 with an inner space 3 is presented in a longitudinal sectional view. The presented pump can be in particular an oil pump of a motor vehicle transmission, preferably an automatic transmission, for the lubrication and/or actuation (execution of shift operations or the engaging/disengaging of transmission shafts) of the transmission. The vane cell pump 1 has front and back intake areas 18, 19 that are arranged in pairs with the front suction pockets 4 and the rear suction pockets 5, which are both arranged diametrically opposed to each other at the housing lids 21 of the housing 2. The suction pockets 4, 5 lead into the inner space 3 of the pump. Arranged inside the inner space 3 is a pump rotor, which is not shown for the purpose of clarity, that rotates around a central rotational axis 29. Wherein, because the pump is designed as a vane cell pump, the pump rotor is a vane rotor. In another design of the pump, for instance as a gear wheel pump, a respective other design of the pump rotor will be applied for instance a transportation gearwheel. Depending on the pump design, several pump rotors can be positioned in the inner space 3.

(6) In addition, first and second pressure areas 11, 12 lead into the inner space 3. During the operation of the pump, rotation of the pump rotor around the rotational axis 29 transports the liquid from the suction pockets 4, 5 through the inner space 3 to the pressure areas 11, 12 and beyond.

(7) At the housing 2, a mainly tangentially directed, cylindrical intake duct is positioned, for the liquid which needs to be transported by the pump 1, and which is, in accordance with the invention, mainly designed as a cylindrical mixing chamber 6. The input side of the mixing chamber 6 is connected with a cover of a suction filter housing 7 or directly designed at it. Through an opening 28 in the cover of the suction filter housing 7, the liquid is sucked in from a not shown storage container. In the connecting area of the mixing chamber 6 and the suction filter housings 7, the cover of the suction filter housing 7 is provided with a nozzle configuration which has a carrier plate 14 for a nozzle 13. The carrier plate 14 is, in this embodiment example, fixed into a holding groove 26 of the cover of the suction filter housing 7, especially clipped to it. The nozzle 13 is preferably designed as one piece with the carrier plate 14.

(8) In addition, at the cover of the suction filter housing 7 is a pressure duct 9 through which, when the pump 1 is operated, a jet stream 10, branched off from its pressure area 11, 12, is transported to the nozzle 13 which injects it into the mixing chamber 6. The connecting ducts between the pressure areas 11, 12 and the pressure duct 9 are not shown here for the reason of clarity. This liquid return operation is to be known in vane cell pumps, for instance in power steering assist systems as described for instance in DE 41 38 516 A1. Such pumps are equipped with a not shown flow control valve through which the transported liquid is brought in a controlled way from the high-pressure area of the pump to its intake area.

(9) The exiting jet stream 10 from the nozzle 13 supports the suction of a hydraulic suction stream 8 which flows, through an opening 28 in the cover of the suction filter housings 7 and via a filter 25, to the mixing chamber 6. After combining of the jet stream 10 and the suction stream 8, a mixed stream 15 is created, preferably with a twist overlay in the mixing chamber 6 from which a first partial stream 16 reaches, via a first, front intake area 18, the front suction pockets 4, and a second partial stream 17 reaches, via a second intake area 19, the back suction pockets 5 in the back.

(10) While the first partial stream 16 for the front suction pockets 4 mostly directly reaches the front intake area 18, the second partial stream 17 for the back suction pockets 5 is brought through a ring duct 20 into the housing 2 to the intake area 19 at the back and enters through the suction pockets 5 into the inner space 3 at back of the pump housing 2. Within the ring duct 20, the flow velocity of the second partial stream 17 diminishes up to the intake area 19 in the back, wherein its kinetic energy is almost completely converted in to pressure energy (ram pressure), in so far that the pressure of the second partial stream 17 present at the back suction pockets 5 essentially matches the pressure of the first partial stream 16 present at the front suction pockets 4.

(11) As it can be seen in the FIGS. 2 and 3, the longitudinal axis 22 of the nozzle 13 extends, in a vertical longitudinal sectional plane A (here the drawing plane of FIG. 2, which is perpendicular to the rotational axis 29 and along which the longitudinal axis 22 extends) at an angle α of approximately 15° to 45°, preferably 15° to 20°, with respect to the longitudinal axis 23 of the mixing chamber 6. Also, the longitudinal axis 22 of the nozzle 13 extends in a horizontal longitudinal sectional plane B (here a plane which is perpendicular to the drawing plane of FIG. 2, which runs parallel to the rotational axis 29 along the longitudinal axis 22) at an angle of approximately 15° to 45°, preferably 30° to 35° with respect to the longitudinal axis 23 of the mixing chamber 6. It can also be seen that the inlet of the nozzle 13, in the vertical sectional plane with respect to the longitudinal axis 23 of the mixing chamber 6, is positioned at an axis deviation of approximately 19% to 25%, preferably 15% to 20%, of the diameter of the mixing chamber 6.

(12) Through this positioning of the nozzle 13 with respect to the input side end of the mixing chamber 6, the desired suction of the suction stream 8 and the creation of a mixed stream 15 is achieved, which causes the front suction pockets 4 and the back suction pockets 5 of the dual flow pump 1 to receive the partial streams 16, 17 with the same pressure and energy content. It can be achieved without a complicated construction effort and without significant energy losses at impact walls, so that practically all the energy content of the jet stream 10, which is under high pressure, is available for the intake charging of the vane cell pump 1.

(13) Finally, it can particularly be seen in FIG. 2, that the nozzle 13 has, with respect to its longitudinal axis 22, an asymmetrical inner shell surface 27 which additionally favors the above described creation of flow. Thus, the inner shell surface 27 can be designed in a way that it favors the creation and presence of a very stable partial stream 17 at the outside at the inner wall of the mixing chamber 6, which flows mainly to the back suction pockets 5, while the suction stream 8, which is drawn by the jet stream 10, delivers the front suction pockets 4 with liquid.

REFERENCE CHARACTERS

(14) 1 Vane Cell Pump 2 Housing 3 Inner Space 4 Front Suction Pocket 5 Back Suction Pocket 6 Mixing Chamber, Feeding Channel 7 Suction Filter housing, Cover of the Suction Filter housing 8 Suction Flow 9 Pressure Duct 10 Jet Stream 11 Back Pressure Area 12 Front Pressure Area 13 Nozzle 14 Carrier Plate 15 Mixed Stream 16 Partial Stream to the Front Suction Pockets 17 Partial Stream to the Back Suction Pockets 18 Front Intake area 19 Back Intake area 20 Ring Duct 21 Housing Cover 22 Longitudinal Axis of the Nozzle 23 Longitudinal Axis of the Mixing Chamber 24 Axis Deviation 25 Filter 26 Holding Groove for the Carrier Plate or Nozzle, respectively 27 Inner Surface Part of the Nozzle 28 Opening in the Cover of the Suction Filter Housing A Vertical Longitudinal Cut Plane B Horizontal Longitudinal Cut Plane