HYDRODYNAMIC MACHINE AND DYNAMIC PRESSURE PUMP THEREFOR

Abstract

A hydrodynamic machine contains a bladed primary wheel driven by a rotary shaft and a bladed secondary wheel, which together form a work chamber filled with a working medium. The machine has a pressure pump for delivering a working medium from the work chamber. The pressure pump has a first inlet, which projects into the work chamber, and has a first inlet opening which is aligned with the rotary shaft in the circumferential direction. The pressure pump has a second inlet which projects into the work chamber and has a second inlet opening which is aligned to the rotary shaft in the circumferential direction opposite to the first inlet opening. The first and second inlets are joined to a common working medium channel behind the two inlet openings. The first and second inlets extend adjacent to each other in the same flow direction separated by a separation wall.

Claims

1-16. (canceled)

17. A hydrodynamic machine, comprising: a bladed primary wheel driven around an axis of rotation; a bladed secondary wheel which together with said bladed primary wheel form a work chamber to be filled with a working medium; a secondary chamber fluidically connected to said work chamber; a dynamic pressure pump for at least indirectly discharging the working medium from said work chamber or from the hydrodynamic machine, said dynamic pressure pump having a dividing wall, a first working medium inlet projecting into said work chamber or said secondary chamber, and a first inlet opening aligned in a circumferential direction with respect to the axis of rotation, said dynamic pressure pump further having a second working medium inlet projecting into said work chamber or into said secondary chamber connected to said work chamber in a manner which allows transmission of the working medium, and a second inlet opening aligned oppositely to said first inlet opening in the circumferential direction with respect to the axis of rotation; said first working medium inlet and said second working medium inlet are joined in a manner which allows transmission of the working medium and form a common working medium channel after said first and second inlet openings; and ahead of said common working medium channel as seen in a flow direction of the working medium, said first working medium inlet and said second working medium inlet extend adjacent to each other in a same direction and are separated by said dividing wall.

18. The hydrodynamic machine according to claim 17, wherein said first and second working medium inlets have a free, invariable flow cross section at least from said first and second inlet openings respectively thereof to said common working medium channel or to an end of said common working medium channel remote from said first and second inlet openings.

19. The hydrodynamic machine according to claim 17, wherein starting from said first and second inlet openings, respectively, said first working medium inlet and said second working medium inlet initially extend toward one another and then in each case in an arc in a common direction.

20. The hydrodynamic machine according to claim 19, further comprising a common deflector, said two arcs are followed in the flow direction of the working medium by said common deflector with an angle of 70 to 110.

21. The hydrodynamic machine according to claim 20, wherein said dividing wall reaches into said deflector or as far as a rear end of said deflector as seen in the flow direction of the working medium and is then followed by said common working medium channel, which extends in a direction of the axis of rotation or parallel thereto.

22. The hydrodynamic machine according to claim 17, wherein said common working medium channel has a working medium transmission length which is a multiple of a working medium transmission length in each case from one of said first and second inlet openings to said common working medium channel.

23. The hydrodynamic machine according to claim 17, wherein said common working medium channel has a diffuser.

24. The hydrodynamic machine according to claim 17, wherein the hydrodynamic machine is embodied as a hydrodynamic coupling; wherein said bladed secondary wheel can be driven by said bladed primary wheel around the axis of rotation by means of working medium circulation in said work chamber; and further comprising a storage chamber for the working medium that is not in said work chamber, said storage chamber being connected to said dynamic pressure pump in such a way that said dynamic pressure pump delivers the working medium discharged at least indirectly from said work chamber into said storage chamber, wherein said storage chamber is likewise disposed so as to revolve with respect to the axis of rotation or to be stationary.

25. The hydrodynamic machine according to claim 17, wherein said first and second working medium inlets of said dynamic pressure pump are held stationary or revolve around the axis of rotation through being driven by said dynamic pressure pump.

26. A dynamic pressure pump, comprising: a first working medium inlet having a first inlet opening; a second working medium inlet having a second inlet opening, said first inlet opening and said second inlet opening are aligned oppositely to one another and said first working medium inlet and said second working medium inlet are joined in a manner which allows transmission of a working medium and form a common working medium channel after said first and second inlet openings; and a dividing wall, ahead of said common working medium channel as seen in a flow direction of the working medium, said first working medium inlet and said second working medium inlet extend adjacent to each other in a same direction and are separated by said dividing wall.

27. The dynamic pressure pump according to claim 26, wherein said first and second working medium inlets have a free, invariable flow cross section at least from said first and second inlet openings thereof to said common working medium channel or to an end of said common working medium channel remote from said first and second inlet openings.

28. The dynamic pressure pump according to claim 26, wherein starting from said first and second inlet openings, said first working medium inlet and said second working medium inlet respectfully initially extend toward one another and then each extend in an arc in a common direction.

29. The dynamic pressure pump according to claim 28, further comprising a common deflector, said two arcs are followed in the flow direction of the working medium by said common deflector with an angle of 70 to 110.

30. The dynamic pressure pump according to claim 29, wherein said dividing wall reaches into said deflector or as far as a rear end of said deflector as seen in the flow direction of the working medium and is then followed by said common working medium channel, which, extends in a direction of the axis of rotation or parallel thereto.

31. The dynamic pressure pump according to claim 26, wherein said common working medium channel has a working medium transmission length which is a multiple of a working medium transmission length in each case from one of said first and second inlet openings to said common working medium channel.

32. The dynamic pressure pump according to claim 26, wherein said common working medium channel has a diffuser.

33. The dynamic pressure pump according to claim 28, further comprising a common deflector, said two arcs are followed in the flow direction of the working medium by said common deflector with an angle of 80 to 100.

34. The dynamic pressure pump according to claim 28, further comprising a common deflector, said two arcs are followed in the flow direction of the working medium by said common deflector with an angle of 90.

35. The dynamic pressure pump according to claim 31, wherein the multiple is at least three times the working medium transmission length.

36. The dynamic pressure pump according to claim 31, wherein the multiple is ten times the working medium transmission length.

Description

[0030] The invention will be explained by way of example below with reference to an illustrative embodiment and to the figures, in which:

[0031] FIG. 1 shows a schematic illustration of one embodiment of the invention in an axial section through a hydrodynamic coupling;

[0032] FIG. 2 shows an advantageous design of a dynamic pressure pump according to the invention, e.g. for a hydrodynamic machine;

[0033] FIG. 3 shows the design according to the invention of a dynamic pressure pump corresponding to FIG. 2 in a sectioned opened-up view.

[0034] In FIG. 1, a hydrodynamic coupling having a primary wheel 1 and a secondary wheel 2 is shown in a schematic illustration, said wheels being surrounded by a housing 3 and together forming a work chamber 4 filled with working medium. In the region of the work chamber 4, the primary wheel 1 and the secondary wheel 2 each carry a multiplicity of blades 5 in order to form a hydrodynamic circulatory flow of the working medium in the work chamber 4.

[0035] Outside the work chamber 4, a secondary chamber 6 is provided enclosed in the hydrodynamic coupling, in this case likewise enclosed by the housing 3. The working medium flows via a working medium outlet 7 out of the work chamber 4 into the secondary chamber 6. To discharge working medium from the secondary chamber 6, a dynamic pressure pump 8 is provided, which projects into the secondary chamber 6 in such a way that the two inlet openings of said pump (only the first inlet opening 9 is visible in FIG. 1 since the second inlet opening is oppositely aligned) dip into the working medium located in the secondary chamber 6. When a dynamic pressure of the working medium is established ahead of the first inlet opening 9 (or of the second inlet opening), either due to revolution of the working medium in a circumferential direction relative to the axis of rotation 10, around which the primary wheel 1 and the secondary wheel 2 also revolve, and/or due to driving of the dynamic pressure pump 8, working medium is delivered from the secondary chamber 6 by means of the dynamic pressure pump 8, e.g. into an external working medium circuit (not shown specifically here) or into a storage chamber, see the arrow with the dashed line and the box in dashed lines, which can represent either the external working medium circuit or the storage chamber.

[0036] Here, the supply of working medium to the work chamber 4 is shown only by way of example, being via a channel in the driving shaft or driven shaft for example.

[0037] As a departure from the illustration in FIG. 1, the housing 3 could also be embodied as a revolving housing, which is connected for conjoint rotation to the primary wheel 1 or the secondary wheel 2, for example.

[0038] An advantageous embodiment according to the invention of a dynamic pressure pump 8 is then shown in FIG. 2. Here, the two mutually oppositely directed inlet openings for the working medium, namely the first inlet opening 9 and the second inlet opening 11, can be seen. The working medium flows either via the first inlet opening 9 of a first working medium inlet 12 or the second inlet opening 11 of a second working medium inlet 13 into the common working medium channel 14, which adjoins the first working medium inlet 12 and the second working medium inlet 13, and then flows out of the dynamic pressure pump 8 via an outflow opening 15 of the dynamic pressure pump 8, which in the present case is aligned in an axial direction. The common working medium channel 14 advantageously has a greater working medium transmission length than either the first working medium inlet 12 or the second working medium inlet 13.

[0039] In the illustrative embodiment according to FIG. 2, the first working medium inlet 12 and the second working medium inlet 13 are each of arc-shaped configuration and are not connected directly to one another in a manner which allows transmission of working medium, or they have no connecting channel. The arcs of the first working medium inlet 12 and of the second working medium inlet 13 are denoted by 20 and 21. They serve to direct the initially oppositely directed flow channel path for the working medium in the same direction, starting in the first inlet opening 9 and the second inlet opening 11, with the result that the first working medium inlet 12 and the second working medium inlet 13 then extend adjacent to one another in the same direction before merging into the common working medium channels 14. In the illustrative embodiment shown, a common deflection 22 is provided in the section of the first working medium inlet 12 and of the second working medium inlet 13 over which these extend adjacent to one another in the same direction. To then prevent the working medium from being able to flow out of the first working medium inlet 12 into the second working medium inlet 13 or out of the first inlet opening 9 into the second inlet opening 11, the first working medium inlet 12 and the second working medium inlet 13 are separated from one another by a dividing wall 19, which here extends as far as the outlet of the two working medium inlets 12, 13 into the common working medium channel 14. In all cases, this common dividing wall 19 should extend as far in the flow direction of the working medium, starting from the two inlet openings 9, 11, that the pressure at the end of the dividing wall 19, as it were at the outlet end of the two working medium inlets 12, 13, has been reduced in such a way, starting from the dynamic pressure in one of the two inlet openings 9, 11, that an overflow into the respective other working medium inlet 12, 13 is avoided. An additional reduction in the pressure at this outlet point or at the outlet end of the dividing wall 19 can be achieved by forming a diffuser 18 in the common working medium channel 14, as is explained in greater detail below with reference to FIG. 3.

[0040] FIG. 3 furthermore once again shows the dividing wall 19, which extends along the two arcs 20, 21 and the deflection 22, which follows in the flow direction of the working medium, as far as the start of the common working medium channel 14. In the illustrative embodiment shown, both the two arcs 20, 21 and the deflection 22 have an angle of about 90.

[0041] The common working medium channel 14 extends perpendicularly to the inflow direction of the working medium into the first inlet opening 9 and the second inlet opening 11 or, when used in a hydrodynamic machine, advantageously extends in the direction of the axis of rotation 10, cf. FIG. 1. In the case of the diffuser 18 provided in the common flow channel 14, the flow cross section for the working medium widens with increasing length, with the result that the pressure at the rear end of the dividing wall 19, i.e. at the start of the common working medium channel 14, is reduced.

LIST OF REFERENCE SIGNS

[0042] 1 primary wheel [0043] 2 secondary wheel [0044] 3 housing [0045] 4 work chamber [0046] 5 blades [0047] 6 secondary chamber [0048] 7 working medium outlet [0049] 8 dynamic pressure pump [0050] 9 first inlet opening [0051] 10 axis of rotation [0052] 11 second inlet opening [0053] 12 working medium inlet [0054] 13 working medium outlet [0055] 14 working medium channel [0056] 15 outflow opening [0057] 18 diffuser [0058] 19 dividing wall [0059] 20 arc [0060] 21 arc [0061] 22 deflection