JPS581276B2 - rotary piston pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a rotary piston pump having a rotary rotary rotatably supported in an eccentric casing bore and surrounded by an axial end sealed to the casing. radial grooves extending in a direction parallel to the axis are provided on the cylindrical outer wall surface of the rotor and are uniformly distributed over the circumferential surface, and rollers, rolling bodies or slides are provided in the radial grooves for sealing and separation. The sealing and separating element is mounted in a radially movable manner in frictional contact in the housing bore, in which case the housing is mounted at the point of the largest annular cross section between the housing and the rotor. It has an approximately radial suction opening for the pressure medium and a discharge conduit to which a conduit for the pressure medium is connected on at least one side and close to the point of the smallest annular cross section, in which case the radial direction It relates to a type in which the spacing of the grooves, measured in the circumferential direction, is smaller than the spacing between the suction opening and the discharge opening.

A conventional rotary piston pump of this type has already been disclosed in DE 25 21 783 A1.

In this case, the supply of pressure medium takes place radially outwardly through the housing, independently of the direction of rotation, so that non-return checks are provided on both sides of the smallest annular cross section between the housing and the rotor. A discharge opening with a valve is arranged.

On this basis, the discharged pressure medium can be discharged outwardly from the housing via a corresponding housing hole and inwardly via a corresponding deflection part via the drive shaft of the pump, thus A corresponding branch is arranged behind the discharge opening of the housing.

In this case, it is possible to split the pressure medium stream into two circuits, but only while maintaining the actual delivery pressure supplied by the pump.

That is, both circuits have the same discharge pressure.

However, it is desirable to have a plurality of pressure medium circuits and also supply different pressure medium pressures, for example a high pressure medium pressure to a hydraulic control device and a low pressure medium pressure to a lubricating oil supply device. There are many cases like this.

This is not possible using conventional rotary piston pumps.

It is therefore an object of the invention to provide a rotary piston pump of the type mentioned at the outset with a plurality of pressure medium circuits having different pressure medium pressures independently of one another.

In other words, a rotary piston pump is provided which simultaneously supplies several streams of pressure medium at different pressures, the pump having a simple design and a space-saving design.

In order to solve this problem, according to the invention, in a rotary piston pump of the type mentioned at the outset, further radial grooves are arranged between the radial grooves, uniformly distributed over the circumferential surface of the rotor. rollers, rolling bodies or slides are supported as sealing and separating elements in the radial groove, and further discharge openings distributed over the casing bore and the circumferential surface of the rotor are arranged in the radial groove. For the discharge conduit connected to the opening, which is arranged approximately radially, the discharge opening of said loak is provided with a check valve, and the mutual spacing of adjacent discharge openings of the casing and the suction opening The distance between the discharge opening of the casing adjacent to the casing and the suction opening is greater than the distance between adjacent radial grooves.

According to the invention, therefore, the respective discharge arc of the rotor is divided into pressure chambers, which have corresponding discharge openings either radially outwardly into the pump housing or radially inwardly. Can be connected inside the herotor.

The discharge opening can be provided with an adjustable check valve, whose adjustable opening resistance can define the pressure in the connected conduit.

If the rotary piston pump is to be constructed so that it can be operated in both directions of rotation, it is advantageous if the discharge opening of the housing is symmetrical with respect to the suction opening and the diameter of the housing bore through the outlet of the smallest annular cross section. and the discharge opening of the casing is provided with a check valve.

The inventive configuration of the rotary piston pump makes it possible to arrange a plurality of chambers over the discharge arc between the suction opening and the smallest annular cross section between the casing bore and the rotor. A plurality of individual discharge openings extend from the starting point, the pressure medium pressure prevailing in the pressure medium circuit connected to the rear being definable or adjustable by means of the opening resistance of the check valve.

In this way, a multi-circuit pump is obtained, the construction cost of which is the same as a conventional rotary piston pump, except for the respective required number of discharge openings and check valves.

The invention will now be explained with reference to the illustrated embodiment.

FIG. 1 shows a pump casing 1 in which a rotor 3 rotates in an eccentric bore 2, the rotor being assembled from a ring 4 and a rotating body 5. and are combined without any play, and are prevented from rotating relative to each other by an adjustment spring 6.

An annular gap 7 is formed between the row 3 and the casing 1, and the casing 1 is located at the widest part of this annular gap.
has a suction opening 8 to which a suction line 9 for pressure medium is connected.

The rotor 3 has 1 uniformly distributed over the circumferential surface of the rotor.
It has rows of radial grooves 10, in each of which a roller 11 or a rolling element is mounted in radial rotation as a sealing and separating element.

By the rollers 11 the annular gap between the casing 1 and the rotor 3 is divided into a plurality of chambers, each of which automatically receives a predetermined amount of pressure liquid from the suction opening 8 when the rotor 3 rotates. Take away.

As soon as the respective chamber has passed through the suction opening 8, the annular gap 7 narrows, so that the pressure medium can be pressurized and delivered into the discharge conduit.

In the embodiment shown, a central discharge conduit 12 is provided in the shaft 13, which is connected via a radial bore 14 with an annular chamber 15, from which it passes through the rotor 3. Three radial holes uniformly distributed over the circumference extend as discharge openings 16 into the radial grooves 10 , which are closed off by check valves 17 .

On the other hand, the pressure medium circuit located on the outside is connected to the annular gap 7.
is formed by a discharge opening 18 arranged near the narrowest point of the casing bore 1.
Via 9 the pressure medium can reach the discharge conduit 20 .

The outlet opening 18 is in this case again closed off by a reversing valve 21 .

This is because the illustrated pump can be operated equally well in both directions of rotation, as can be seen from its symmetry about its vertical central axis.

The second pressure medium circuit located on the outside has a corresponding outlet opening 30 to which a check valve 31 is connected, through which the pressure medium can flow. conduit 32
leaks to.

When the rotor 3 rotates, the pressure medium is first of all under pressure over approximately the lower quarter of the arc of the circumferential surface of the rotor, and this pressure causes the pressure medium to overcome the check valve 17 and enter the central pressure medium circuit. into the discharge conduit 12.

Each annular chamber formed between two coils 11 has a discharge opening 3.
As soon as zero is reached, a further supply of pressure medium takes place via this outlet opening.

This is caused by the fact that the closing force of the check valve 17 is greater than the closing force of the check valve 31.

In this way, the rotary piston pump delivers a higher pressure medium pressure via the central delivery conduit 12 than via the conduit 30.

Finally, the annular chamber reaches the outlet opening 18 and supplies the pressure medium via the outlet opening, in this case also
The closing force of the check valve 17 is greater than the closing force of the check valve 21.

In FIG. 1, radial discharge openings 16 open into radial grooves 10. In FIG.

However, the discharge opening 16 is adjacent to the column 11.
Of course, it is also possible to have an opening at any location in between.

In the rotary piston pump shown in FIG. 1, three pressure medium circuits are formed, one for relatively high pressures and two for relatively low pressures. There is.

However, it is also possible to branch out further pressure medium circuits in the housing 1 as well as in the rotor 3 by providing further discharge openings distributed over the circumference.

However, in this case, the following conditions apply:

In other words, in order to ensure that the annular chambers formed between the spaces 11 when passing through one discharge opening can respectively supply only that discharge opening, when the number of provided discharge openings increases, , the circumferential spacing between adjacent rollers 11 must be reduced.

Of course, if a separate pressure medium circuit is formed in the rotor, a correspondingly separate axial bore is provided in the discharge conduit 1.
2, the discharge conduits are each connected with a radial discharge opening.

Furthermore, FIG. 1 also shows fixing holes 22 in the housing 1, with which the housing can be installed in the field.

FIG. 2 shows a cross-sectional view of the rotary piston pump shown in FIG. ing.

As can be seen in FIG. 2, the pump is mounted via the rotating body 5 of the rotor in a radial bearing 23 of the shaft 13 in a housing 24 of a transmission or the like.

In this case, the pressure medium pressure delivered via the delivery line 12 is directed to the outside, for example to a control device, whereas the pressure medium flowing out via the delivery line 20 is used for lubricating and cooling the transmission parts. I can do it.

Further, as shown in FIG. 2, the rotor 3 is surrounded on one side by the casing 1, while the other side is sealed by a ring 25 fitted with a snap ring. It is axially fixed in the casing 1 by 26.

Finally, as shown in FIG. 3, the pump can also be mounted together with the housing 1 directly in the housing 27 of a transmission or the like, in which case the suction conduit 9 and the discharge conduit 20 are connected to the housing 27. located within the wall itself and sealing ring 28 . It is sealed by 29.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a rotary piston pump according to the present invention, Fig. 2 is a cross-sectional view taken along line 1-1 in Fig. 1, and Fig. 3 is a sectional view taken along line 1-1 in Fig. 1. It is. 1, 24.27... Casing, 2... Hole, 3... Rotor, 4... Ring, 5... Rotating body, 6... Adjustment ring, 7... Annular gap, 8... Suction opening, 9 ... Suction conduit, 10 ... Radial groove, ; 11 ... Roller, 12.2
0...Discharge conduit, 13...Axis, 14...Radial hole, 1
5...Annular chamber, 17,21.31...Check valve, 16,1
8, 30...Discharge opening, 19...Casing hole, 22
...Fixing hole, 23...Radial bearing, 25...Ring, 26...Snap ring, 28.29...Seal ring, 32...Conduit.

Claims (1)

Claims: 1. A rotary piston pump comprising a rotor rotatably supported in an eccentric casing bore and surrounded by an axial end sealed to the casing, the rotary piston pump comprising: Radial grooves extending parallel to the axis are provided on the outer cylindrical wall surface of the rotor and are uniformly distributed over the circumferential surface, and rollers, rolling bodies or slides are installed in the radial grooves as sealing and separating members. radially movable mounting, the sealing and separation element being in frictional contact with the housing bore, in which case the housing is provided with an inlet for the pressure medium at the point of the largest annular cross section between the housing and the rotor. The suction opening of the radial groove has an approximately radial discharge opening to which a conduit for the pressure medium is connected at least on one side and close to the point of the smallest annular cross section. Further radial grooves are arranged between said radial grooves 10, uniformly distributed over the circumferential surface of the rotor 3, in those types in which the spacing measured at is smaller than the spacing between the suction openings. The rollers 11, rolling bodies or slides are supported in the radial grooves as sealing and separating members, and the casing bore 2 and the rotor 3 are
Distributed over the circumference of the rotor is a further discharge opening 16.30 arranged approximately radially for a discharge conduit 12.32 connected to the discharge opening of the rotor. The section 16 is provided with a check valve 17, the distance between adjacent discharge openings 18. A rotary piston pump characterized in that the spacing between the radial grooves is greater than the spacing between the radial grooves. 2 the discharge opening 18.30 of said casing 1 is arranged symmetrically with respect to the suction opening 8 and the diameter of the casing bore 2 passing through the point of smallest annular cross section;
The discharge opening of the casing is a check valve 21. A rotary piston pump according to claim 1, comprising: 31. 3. All discharge openings 16, 18, 30 are fitted with check valves 17,
21. The rotary piston pump according to claim 1, wherein the rotary piston pump is provided with: 21.31 and the opening resistance of the valve is adjustable.