DE2619006A1 - VINGE CELL PUMP - Google Patents

Description

The invention "refers to a vane pump with adjustable delivery volume due to the different shape of the curve sections of the stroke ring, which control the pumping capacity control the pump blades. The pump output results from the delivery volume between the pump blades as well as from the delivery volume of the rotor slot chambers formed under the blades.

The power control is usually an adjustable one Vane pump by moving the lifting

572- (P; 00924 W.Germ.) -Schö

809846/0764

rings in various eccentric positions with respect to the rotor carrying the blades. With such pumps the lifting ring must be suitably fluid-tight and movable to set the required pump output to be ordered.

In the US patent application ITr. 470,988 (May 17, 1974) of Applicants are several embodiments of a multistage displacement pump and a corresponding method described. With this vane pump with a non-rotatable lifting ring, the total output is set from the pumping action in the cells and from that in the rotor slots under the blades. The pump is of the double curve type, the stroke ring having two identically shaped elliptical curve sections. The adjustable Delivery volume is achieved in that either the total flow of liquid from the cells and the underwing chambers or just one or the other other chambers is used. The unused delivery volume is returned to the suction side of the pump. Included the volume adjustment is achieved by selectively using either the underwing chambers or the cells will. If the displacement is only obtained from the underwing chambers, there will be a leakage of liquid from the rotor slots past the blades into the cells, reducing the pump performance. at the known pump it is not possible to obtain four delivery volume ranges of the pump.

In US-PS 2,832,199 a vane pump with only one control cam is described, in which several-

609848/0764

26190Q6

re delivery volumes are obtained that the pump several Has conveyor slots that "arcuate" along the movement the! wings are formed so as to be spaced apart from one another in an arc, so that one is connected to each conveyor slide Delivery line receives a certain amount of the delivery volume. This vane pump has neither two Control curves and multiple delivery from cells and under-wing chambers still provide a selective delivery volume control.

The object of the invention is to create two control curve sections having vane pump with a non-rotatable lifting ring and four different delivery volumes, consisting of two groups of cells and two groups of under-wing chambers in the rotor slots below the Wings are obtained, wherein the lifting ring has two differently shaped curve sections, which when interacting the wing each with one of the curve sections result in a different flow rate.

In this vane pump with an adjustable delivery volume, the vanes of the pump run along two different lengths shaped, essentially elliptical curve sections of a cam ring, so that the delivery volume of the Cells and the lower wing chambers when the wing interacts with the one curve section of the delivery volume when interacting with the other curve section is different.

In d.er pump according to the invention there are four different Delivery volumes from the two groups of cells and the

609846/0764

two groups of additional underwing chambers "at Obtain interaction with the two curve sections.

In a further embodiment of the invention, a common delivery line is for the cells and the lower wing chambers when the wings interact with one curve section of the cam ring and a common delivery line provided for these chambers when the wings interact with the other curve section. Control links ensure that the delivery volume obtained from both common delivery lines is used or of the delivery flow from one or both delivery lines, which is less than the total volume. Included it is possible not to cut off the delivery flow from at least one of the common delivery lines at all to use.

The flow rate through a common feed line is reduced in that part or all of it Amount of liquid is returned to a suction line of the pump. The control is carried out by a shut-off device, which responds to a pressure in the consumer circuit, so that certain changes in fluid pressure cause changes in the liquid flow returned to the suction side of the pump in the consumer circuit and so that the total volume supplied to the consumer circuit is changed.

The vane pump with two cam sections comprises a housing with a rotor that has several slots

6098 ^ 6/0764

having. In each slot there is a pamphlet stored, which runs on a surrounding stroke ring. There are slots and lines for pumping from under-wing Chambers and cells provided. The JTubring has two differently shaped, essentially elliptical curve sections, so that the Vanes in cooperation with the one curve section of the pumped liquid volumes from the im Interaction with the other curve section pumped liquid volumes are different. In one embodiment, four independent liquid volumes are conveyed. In another embodiment, shut-off devices control the flow rate, so that it is derived from the total flow rate or smaller amounts of liquid, e.g. B. only from that of the wings in cooperation with one of the curve sections conveyed liquid volume or only a part of the same exist can.

Embodiments of the invention are explained in more detail below with reference to the drawing. Show it:

1 shows a vertical section transverse to the axis of rotation of the pump rotor along the section line 1-1 of FIG. 2, the suction and delivery lines being different are hatched;

ΒΠ98 / .6 / 076Α

2819006

Pig. 2 one. Section along section line 2-2 of FIG. 1; and

Pig. 3 shows a view of a second exemplary embodiment of the vane cell pump with an associated control circuit for achieving an “adjustable delivery volume.

In the embodiment shown in FIGS. 1 and 2, a pump housing 10 has an inner chamber a shaft 11 extending through the chamber. A cylindrical rotor 12 is mounted on shaft 11 " and has a plurality of slots 15 with larger base areas 34 which extend substantially radially extend outside to the rotor outer surface. Each slot accepts a reciprocable, extendible pumping element in the form of a wing 16. When the rotor 12 rotates, the blades 16 follow a cam ring 20, which is arranged in the housing 10 and on each side sliding plates 21 bzx · /. 22 has. Each Fig. 2 will be the slotted plates 21 and 22 with the rotor 12 in connection and against the cam ring 20 by hydraulic Clamping between an end cap 25 and an under Pressure standing member 26 held, which bear against the slotted plates 21 and 22, respectively. Hydraulic fluid is through a channel 26a is supplied. Alternatively, the slotted plates 21 and 22 also held on the cam ring 20 by means of bolts (not shown) passing through them.

8098 '»6/0784

The furve shape of the Hubriners 20 is a "special feature the invention; The two curve sections of the cam ring that cause the vanes 16 to run off have control different curve shape. After Pig. 1, the inner surface of the cam ring 20 has two transition points and 31, an upper curve portion 32 and a lower curve portion 33. The upper curve portion 32 is essentially elliptical and there is a change in the curve from a smaller to a larger one Radius of a predetermined size as a function of the desired conveying effect of the wings 16 when making contact of the curve section 32. The second curve section 33 has a greater change between the smaller and the larger curve radius than the curve section 32 (see. Fig. 1). The pump uses the cells formed by the spaces between the wings which generate a displacement volume, as well as chambers formed by spaces under the blades and the reciprocation of blades 16 in the rotor slots 15 off.

The slot plates have four curved pump suction slots, two of which are inner suction slots selectively are connected to the pump chambers formed by the rotor slots 15 and their base regions 34. Furthermore are first and second outer suction slots are provided which are selectively connected to the cells. These suction slots can be formed in both slot plates 21 and 22 or in the lifting ring 20. According to FIGS. 1 and 2, they are in the slotted plate 21

609846/0764

2819006

ο -

formed, namely together with suction channels 40 and 41, the outer suction slots 42 "and 43 liquid respectively. Two suction channels 45 and 46 lead to the inner suction slots 47 and 48 liquid.

There are four curved conveyor slots provided in both slot plates 21 and 22 can. In the exemplary embodiment, certain conveyor slots are only formed in the slot plate 21. Inner conveyor slots 50 and 51 are provided for the chambers under the pump blades. There are also two Outer conveyor slots 52 and 53 associated with the cells are formed. The conveyor slots 52 and 53 can also be formed in the cam ring 20. Corresponding conveyor slots 52a and 53a are in the slot plate 22 and are connected via two slots 54 and 55 in the cam ring.

The end cap 25 has four conveying channels 60, 61, 62 and 63, which with the respective pairs of the inner Conveyor slots 50 and 51 and the outer conveyor slots 52 and 53 are connected. Thus, the pump can control the flow from the cells and the under-wing chambers use separately, due to the different contours of the curve sections 32 and 33 of the cam ring all four flow rates are different.

When the rotor 12 rotates in the direction of the arrow of Fig. 1, hydraulic fluid, e.g. B. jet fuel, through the suction channels 40 and 41 the outer suction

6098 ^ 6/0764

slots 42 and 43 and through channels 45 and 46 the inner suction slots 47 and 48 supplied. When considering the operation with reference to the The wings 16 follow the curve section 33 of the liubring the curve section past the bottom dead center position of the maximum wing extension, with over this Location addition pumping takes place. The delivery volume from the cells is delivered to the outer delivery slot 53, and the underwing chambers promote due to the Inward movement - the blades in the rotor slots, which is caused by the cam ring, liquid to the conveying slot 51. When the blades 16 with the curved section 32 of the stroke ring cooperate, pumping begins after the top dead center position of the vanes (See Fig. 1), with fluid from the cells to the outer conveyor slot 52 and from the underwing chambers is promoted to the inner conveyor slot 50. Since the curve section 32 has a smaller Change from the small to the larger radius than in the curve section 33 results, each cell has a smaller one Delivery volume when the blades run over the curve section 32 than when they run over the Curve section 33 run so that the delivery volume pumped to the delivery slot 52 is lower than the volume pumped to the delivery slot 53. Likewise, the stroke is that with the curve section 32 cooperating wings less than that of the cooperating with the curve section 33 Wings, so that in the rotor slots below the wings including the larger base areas 34 a smaller volume of liquid is absorbed. As a result, the outer conveyor slot 50 is a

B098 / .S / 0764

smaller volume of liquid than the inner conveying slot 51 supplied.

The pump according to FIGS. 1 and 2 generates four different delivery volumes by means of a rotationally fixed cam ring 20, the sv / ei essentially elliptical X-curve sections with has different Eurvenform.

All bearing loads that arise must be carried out at the Design of the pump must be taken into account.

In the embodiment according to FIG. 3, the pump has, in principle, the pale structure. A transfer ring 61 has two curve sections 62 and 63 corresponding to the curve sections 32 and 33 of the pump according to FIG. 1, which are essentially elliptical and have different curve shapes, so that the different delivery volumes are obtained in accordance with the exemplary embodiment according to FIG. The pump 60 comprises a first suction line 65 and a second suction line 66 , to which liquid is supplied from a line 67 which comes from an additional pump 68, which in turn is connected via a suction line 69 to a liquid supply. The suction line 65 supplies an outer suction slot 70 and an inner suction slot 71 corresponding to the suction slots 42 and 47 of the pump according to FIG. 1. The suction line 66 supplies an outer suction slot 72 and an inner suction slot 73, which correspond to the suction slots 43 and 48 of the pump according to FIG 1 correspond. The suction slots of each group are connected by a channel 74 or 75, which is indicated in dashed lines.

6098 / * δ / 076 4

The flow rate of the pump becomes a consumer circuit leading line 80 supplied, e.g. B. the fuel control loop of a jet engine. The promotion to Line 80 takes place through two common delivery lines 81 and 82 leading away from the pump. The common one Conveying line 81 is via a connecting channel 87 with an outer conveyor slot 85 and an inner conveyor slot 86 connected. The common conveying line 82 is via a connecting channel 92 with an outer conveying slot 90 and an inner conveyor slot 91 connected. Takes place when the pump rotor rotates clockwise both cell and sub-vane pumps between the suction line 65 and the common delivery line 81 as well as between the suction line 66 and the common delivery line 82, the liquid flow being too of each delivery line is the sum of the cell and under-wing pumping power and that of the common delivery line liquid volume supplied is smaller than that supplied to the common delivery line 82, due to the different contours of the curve sections 62 and 63. The common conveyor lines 81 and 82 lead together into line 80, the liquid flow flowing through a flow filter unit 95. Furthermore, a shut-off element 96 is arranged in the common conveying line 82, which a flow from the Delivery line 81 to delivery line 82 prevented under certain conditions to be explained.

The pump 60 has an additional pair of alternating flow paths, one of which is from the delivery slots

609846/0764

85 and 86 return through a channel 97 to the suction line 65, this liquid flow from a control valve 100, which is closed by a spring 101 is regulated. When the valve is opened, liquid flows into the suction line 65 and with it back into the pump. A second control valve 105 is closed by a spring 106, which is weaker than the spring 101 is. The control valve 105 ″ blocks the flow from the delivery slots 90, 91, permissible however, in its open position, flow through channel 110 to suction line 66 and into the Pump back. The channel 110 is also connected to the outflow side of a pressure relief valve via a line 111 112 in connection, which is adjustable so that the delivery line 80 carries a maximum pressure. The different spring forces of the springs 101 and 106 cause the control valve 105 in front of the control valve 100 is opened. The two control valves are of different sizes: the control valve 100 is smaller, since it is assigned to the pump section with a lower delivery volume.

The opening of the control valves is further controlled by a control circuit 120 comprising a servo control valve. The control valve is acted upon by the control pressure of the pumping liquid at the flow filter 95 via a line 121, and it has a line 122 leading to a liquid container a line 125 _f to the

809846/0764

- 13 - 2819006

Control valves 105 "or 100 leading branch lines "or 127, supplies an intermediate pressure. A second branch line 121b of the control pressure line leads to the control valve between the control slide edges 128 and 129, so that a pressure difference prevents impurities in the fuel on the control slide edge 129 pass into the control area of the valve.

The position of the control slide 123 is controlled by a pressure difference, with which a gain causing membrane 130 is acted upon. Two conduits 131 and 132 are on opposite sides of the membrane connected and running from opposite sides of an adjustable bezel in a fuel regulator, so that a gate pressure difference a downward displacement of the membrane and a decrease in the Control slide 123 causes. ! la Fig. 3 he takes Control slide 123 an upper layer, so that the intermediate pressure in the line 125 is relatively high and the backs of the two control valves are acted upon so that the springs close the control valves keep. When the pressure difference between the lines 131 and 132 is sufficient to remove the diaphragm 130 deflecting downwards, the control slide edge shifts 124 in such a position that the liquid flow to line 125 is metered in such a way that that the intermediate pressure drops; at a predetermined value, the control valve 105 opens, so that a part of the delivery stream flows through channel 1.10 and back to suction line 66. If the intermediate pressure continues

609846/0764

drops, the control valve 105 opens further, and finally the intermediate pressure is reduced to such an extent that that the control valve 100 also opens.

When starting "there is no intermediate pressure because the line 121 no pressure leads.

A spring 140 presses the valve slide 123 into the more frequent position ("cf. FIG. 3). Furthermore," a Branch line 141 "from line 132 to the lower side of the valve slide, so that the compressive force in the Line 132, which is directed against the underside of the membrane and acts on the control slide edge 129, balanced and the valve position is not influenced.

The arrangement of FIG. 3 is z. B. for supply an aircraft engine can be used in the flow areas between a minimum flow at idle are required during the landing approach and a maximum flow at the highest thrust. In this case the Flow from the common delivery line 81 is suitable for the lower flow requirements of the engine Volume, and the maximum flow at maximum thrust comes from both common delivery lines 81 and 82 at the highest liquid volume. This arrangement results in greater overall performance without the use of an adjustable pump with an adjustable lifting ring, which also has a lower overall performance Has. Furthermore, there is a higher volumetric efficiency than achieved with the applicant's pump mentioned at the outset, as always in the cells and also at the same time

609846/0764

is pumped in the associated under-wing chambers. This creates a strong pressure difference between the Under-wing chambers and the cells avoided, so that the liquid leakage around the wing edges from the ground the rotor slit to the cells is kept small. This enables increased volumetric efficiency the pumping "at higher pressures.

609846/0764

Claims (15)

2819006 claims 1.J Vane pump with a housing, a rotor with a plurality of substantially radial slots and an inverted number of extendable blades, at least of which in each case one is mounted in each slot, and with a Tubring surrounding the rotor with two curve sections, characterized in that in control members (21, 22; 65, 66) arranged inner Suction slots (4-7, 48; 71, 73) selectively with through the Rotor slots (15) under the blades (16) defined chambers and outer suction slots (42, 43; 70, 72) selectively can be connected to the cells that zv / ei inner conveyor slots (50, 51; 86, 91) selectively with the chambers under the wings (16) and two outer conveyor slots (52, 53-85, 90) selectively with the cells are connectable, and that the essentially elliptical curve sections (32, 33; 62, 63) of the cam ring (20; 61) are different are shaped so that the chambers and the cells in cooperation with the one elliptical curve section generate a total delivery volume that differs from the total delivery volume when interacting with the other Curve section differs. 2. Pump according to claim 1, characterized in that each inner and outer conveyor slot (50, 51 or 52, 53) has a separate feed channel (60-63) in the housing (10). 009848/0764 3. Pump according to claim 1, characterized in that the first inner and the first outer conveyor slots (86, 85) have a first common conveyor line (81) and the second inner and the second outer conveyor slot (91, 90) a second common conveyor line (82) to have. 4. Pump according to claim 3, characterized in that a consumer circuit with the common delivery lines (81, 82) connected, the smock for controlling the flow from both delivery lines (81, 82) so that liquid is obtained either from one or both delivery lines (81, 82). 5. Pump according to claim 4, characterized in that through the means in the consumer circuit, a delivery flow from one delivery line (82) or the full or a 2-part delivery flow is obtained from the other delivery line (81). 6. Pump according to claim 5, characterized in that the means in the consumer circuit from a control valve (100) assigned to the other delivery line (81) and an actuator (101) for the pump pressure for opening the control valve (100). 7. Pump according to claim 6, characterized in that a channel (97) on the outflow side of the control valve (100) leads to several suction slots, so that when 6098 ^ 6/0764 Open the control valve (100) liquid to the suction side the pump returns. 8. Pump according to claim 6, characterized in that the actuator is a spring (101) and an adjustable one Liquid pressure closes the control valve (100). 9. Pump according to claim 5, characterized in that the gowns in the consumer circuit have two control valves (100, 105), each assigned to a common delivery line (81, 82), actuators (101, 106) for different Liquid pressures for positioning the control valves (100, 105) and one channel (97, 110) each, that from the downstream side of the associated control valve (100, 105) to a suction area (65, 66) for the return the liquid to the pump. 10. Pump according to claim 9, characterized in that the actuators are springs (101, 106), each on one Valve (100, 105) and one (106) is relatively weak and the other (101) is relatively strong, and that means act on the control valves (100, 105) with adjustable pressure, 11. Pump according to claim 10, characterized in that the means for acting on the control valves (100, 105) with adjustable pressure, a control valve (120) for metering a control pressure that delivers the adjustable pressure and means for positioning the control valve (120) based on a unit defined by fluid is supplied to the pump. 12. Vane pump with a housing, a rotor with a plurality of essentially radial slots and a plurality of vanes, at least one of which is mounted in each slot, and with a cam ring having two curve sections,
characterized by means (65, 66) having first and second suction slots (71, 73, 70, 72) and first and second conveyor slots (86, 91, 85, 90) connected to the cells during rotation of the rotor (12) are, and differently shaped, essentially elliptical curve sections (62, 63) each between a suction and a conveying slot, so that when the cells interact with one curve section, the conveying flow is different from the conveying flow when interacting with the other curve section. 13. Pump according to claim 12, characterized in that a liquid circuit with the conveying slots (85, 86, 90, 91) for liquid return from a conveying slot (85 or 86, 90 or 91) to a suction area (65 or 66) is connected. 14. Vane pump with a housing, a rotor with a plurality of substantially radial slots and several pump elements each mounted in a slot, and with a lifting ring having two curve sections, characterized by slotted plates (21, 22) with first and second suction 9848/0764 2819006 slots (42, 43, 47, 48) and first and second conveyor carriages (50, 51, 52, 53), which are connected to the chambers iinter the pump elements (16) during the rotor rotation are and differently shaped, essentially elliptical curve sections (32, 33) each between a suction and a delivery slot, so that when the chambers interact with the one curved section, the delivery volume is different from the delivery volume when interacting with the other curve section. 15. Pump according to .Anspruch 14, characterized in that with the conveying slots (50-53) a liquid circuit for returning liquid from one conveying to one Suction slot is connected. 603846/0764 Blank page