Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2/00—Rotary-piston machines or pumps
  • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
  • F04C2/40—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C2/08 or F04C2/22 and having a hinged member
  • F04C2/44—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C2/08 or F04C2/22 and having a hinged member with vanes hinged to the inner member
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2240/00—Components
  • F04C2240/20—Rotors
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
  • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
  • F05C2225/12—Polyetheretherketones, e.g. PEEK

Definitions

• the invention relates to a hybrid pump for conveying a liquid pumping medium with the features of the preamble of claim 1.
• a hybrid pump is understood as meaning a pump which operates as a displacement machine in a first operating mode and as a turbomachine in a second operating mode in order to be able to combine the respective advantages of these two types of pump.
• a known hybrid pump (DE 101 58 146 Al) has a housing which is equipped with an inlet, an outlet and a pump chamber.
• the pumping chamber has a running surface which is substantially round or round in cross-section for a rotor with rotor blades which can be rotated about a rotor axis, and in each case has a lateral surface on both sides of the rotor.
• the rotor is arranged eccentrically in the pump chamber, wherein the rotor blades are movable relative to the rotor otherwise.
• the rotor blades, together with the tread of the pumping space, define a plurality of pumping chambers.
• the inlet is arranged in the side surface of the pump chamber.
• the problem with the known hybrid pump is the fact that the filling and emptying of the pumping chambers during pumping is not optimal. For example, it has been proven that the pumping medium is exchanged only to a small extent in that part of the pumping chambers which faces the rotor axis. This has not been significantly improved by the arrangement of the inlet or the outlet in the side surface of the pump chamber. The volume of the pumping chambers is therefore used only insufficiently in pumping operation.
• the arrangement of the inlet or the outlet in the side surface of the pump chamber is basically connected to a deflection of the pumping medium to about 90 ° depending on the configuration.
• this leads to the formation of a dead space, which is ignored during the filling of the pump chambers. remains. This leads to insufficient filling of the pump chamber. The resulting efficiency of this pump is low.
• the above-explained known hybrid pump has already been designed and developed with regard to an improved efficiency (DE 20 2005 007 789 U1), namely by using a rotor which consists of chemically resistant, substantially non-elastic plastic, in particular PEEK and a side surface of the pump chamber associated with a base plate, are fixed to the fixed rotor parts. At the outer end of each fixed rotor part, a curved rotor wing is pivotally articulated. Between adjacent rotor parts and rotor blades, the pumping chambers of the rotor are formed, which are closed to the upper side surface of the pump chamber as previously open, to the lower side surface, however, by the base plate.
• the design of the rotor is utilized to locate the inlet or outlet in the upper side surface of the pumping space such that the geometric rotor axis passes through the inlet and the outlet, respectively.
• the flow path of the pumping medium initially runs along the rotor axis and then into the respective pumping chamber. This ensures that a filling of the pumping chambers takes place at least in part from a position which is as close as possible to the rotor axis. The rotor is so to speak penetrated by the pumping medium. The above-described image of a dead space in the pumping chambers can thus be largely avoided. As a result, the quality of the filling of the pump chambers in pumping operation increases.
• a rotor penetrated by the pumping medium, as it were, of the type described above is not used in all cases in a hybrid pump. bar.
• the teaching of the present invention is therefore based on the problem of increasing the known pump with the rotor having a base plate in the efficiency, without forming part of the area surrounding the geometric rotor axis hollow.
• the rotor is suitably made of chemically resistant, substantially non-elastic plastic, in particular made of PEEK.
• the efficiency is increased in this hybrid pump characterized in that the flow pattern of the liquid pumping medium is made uniform in the pumping chambers. This is achieved in that the bottoms of the pumping chambers a suitably arcuate, a uniform deflection of the flow causing course is given. At the same time, the unused dead spaces in the pumping chambers are reduced. Where previously remain at rather angular course of the pumping chambers remains of the liquid pumping medium, which hindered the uniform flow of the liquid pumping medium, now simply run the bottoms of the pumping chambers.
• the bottoms of the pump chambers have a superimposed spiral course towards the rotor axis. So they not only rise concave-arc, but also extend in the circumferential direction in turn arcuately from an outer, more tangential section starting on the rotor axis.
• the base plate of the rotor is designed accordingly adapted. It is usually not a smooth, flat plate, but a contoured in many ways, the corresponding courses in the surface and at the edges providing construction.
• the stationary rotor parts run in a curved manner in the circumferential direction of the rotor, and that the bottoms of the pumping spaces, as seen in plan view of the rotor, are each curved in the manner of a curve. Run following the adjacent stationary rotor part following radially outward. This then causes the base plate on the outer circumference does not run smoothly circular, but has the individual rotor blades corresponding stages.
• the hybrid pump according to the invention is designed to realize the most uniform, less turbulent flow conditions on and in the rotor.
• the movable rotor blades extend into the plane of the base plate, preferably io as far as the bottom, and that the arcuate course of the inside of the rotor blades the arcuate course of the outer edge of the floors corresponds so that the rotor blades come to rest well on the outer edges of the soil.
• the rotor blades in the hybrid pump according to the invention are so stiff that it is sufficient to provide a guide rail bridging the outlet for the outer edges of the rotor blades.
• Particularly useful are two guide rails above and below the outlet 5, which then support the rotor blades when passing through the outlet on both sides.
• the inlet is still left in the upper side surface of the pump chamber in the construction described above, but can arrange the outlet in 0 of the tread of the pump chamber and align tangentially. This leads to a further improvement in the efficiency of the hybrid pump, because a renewed deflection of the liquid flow can be omitted.
• the hybrid pump according to the invention is operated in operation at speeds of meh-5 reren thousand, preferably about 8,000 U / min.
• FIG. 1 is a view of the lower part of the housing with the pump chamber and disposed therein rotor
• Fig. 5 shows the rotor of Fig. 4 in a perspective view, movable
• Fig. 6 seen the rotor of Fig. 4 in an end view from the rear side.
• the illustrated embodiment shows a hybrid pump for conveying a liquid pumping medium, ie a pump that can work both as a displacement machine (vane pump) and as a turbomachine (centrifugal pump) due to the construction of the rotor.
• the hybrid pump has a housing 1, of which one sees in Fig. 1 and 2, the lower part Ia while Fig. 3 shows the upper part Ib, so practically the cover for the lower part 1 a.
• the housing 1 has a pump chamber 2.
• In the pump chamber 2 opens an inlet 3, visible in Fig. 3 in the upper part Ib of the housing 1.
• an axial inlet 3 whose contour is matched to the design of the rotor to be explained below.
• the pump chamber 2 also has an outlet 4 leading out of the pump chamber 2, which can be seen in FIG.
• the outlet 4 could, as in the prior art, also be arranged axially.
• the illustrated and preferred embodiment shows the outlet 4 tangentially from the pump chamber 2, leaving.
• a rotatable about a rotor axis 5 rotor 6 is arranged.
• This consists in the illustrated and preferred embodiment of substantially non-elastic plastic.
• PEEK polyether ether ketone
• it should be a chemically resistant plastic so that the hybrid pump according to the application in the field of chemical applications can be used without problems.
• the pump chamber 2 has a cross-sectionally substantially circular or a continuously extending, although somewhat deviating from the circular shape, but still suitable for a rotational movement of the rotor 6 tread 7.
• the pump chamber 2 On the two sides of the rotor 6, so not on the circumference, the pump chamber 2 each have a side surface 8; 8th'.
• the rotor 6 is arranged eccentrically with respect to the running surface 7 in the pump chamber 2.
• the rotor 6 has one of the lower side surface 8 of the pump chamber 2, which is indicated in Fig. 1 and 2, associated base plate 9.
• the rotor 6 is shown in detail in FIGS. 4 to 6.
• the base plate 9 is designated in particular in FIGS. 5 and 6.
• the rotor 6 further comprises a plurality of circumferentially substantially uniformly spaced, with built-rotor 6 to the opposite side surface 8 'of the pump chamber 2, indicated in Fig. 3, extending rotor parts 10, which are fixedly connected to the base plate 9 ,
• the unit of base plate 9 and rotor parts 10 so to speak represents the main body of the rotor 6.
• This body is shown in Fig. 5 in a perspective view.
• a preferably curved rotor blade 11 is pivotally articulated. 4, corresponding parts of the pivot joints 12 can also be seen in FIG. 5.
• FIGS. 1 and 6 these are likewise to be recognized, but not identified by reference numerals.
• the pumping chambers 13 of the rotor 6 are formed. These are open to the upper side surface 8 'of the pump chamber 2 and their bottoms 13' are formed by the base plate 9 of the rotor 6.
• Fig. 5 can be particularly well seen that the bottoms 13 'of the pumping chambers 13 extending from the outer edge of the base plate 9, starting inwardly towards the rotor axis 5 concave-arc rising. It also recognizes the special feature that the bottoms 13 'of the pumping chambers 13 to the rotor axis 5 have a superimposed spiral course, so are twisted in a certain way in the space to the rotor axis 5 out.
• the illustrated shape of the bottoms 13 'of the pumping chambers 13 leads to the fact that the pumping chambers 13 are completely filled and the pumping medium is completely exchanged in the rotor axis 5 facing parts of the pumping chambers 13. Dead spaces omitted. The flow of the pumping medium in the pumping chambers 13 is as even as possible.
• the rotor blades 11 are preferably bent.
• An arcuate design of the rotor blades 11 corresponds to the direction of rotation-related configuration of the rotor 6 as a whole.
• the advantages of curved rotor blades 11 in FIG. 1 can be seen particularly clearly.
• the overall arcuate course of the pumping chambers 13 results.
• the bottoms 13 'of the pumping chambers 13 extend in each case. because arcuately following the course of the adjacent stationary rotor part 10.
• the base plate 9 on the outer circumference is not approximately circular, but has a step-shaped course. This can be seen particularly well in Fig. 6, which shows the back of the base plate 9.
• the outlet 4 from the pump chamber 2 in the tread 7 of the pump chamber 2 is arranged.
• the rotor blades 11 thus sweep when rotating the rotor 6 at high speed, for example, 8000 U / min, constantly the outlet 4.
• the material of the rotor 6 and its rotor blades 1 1 made of plastic is largely inelastic and torsionally rigid, it results in a Considerable wear of the radially outer ends of the rotor blades 11 in the constant impact on the edges of the outlet. 4
• At least one guide strip 15 bridging the outlet 4 in the manner of a rail is provided for at least one outer edge of the rotor blade 11.
• Fig. 2 is the guide bar 15 down to the lower side surface 8 back. It is preferable to position a guide strip above and below the outlet, so that the outer ends of the rotor blades 11 are guided over the outlet 4 in a very uniform manner like a rail.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Rotary Pumps (AREA)
• Details And Applications Of Rotary Liquid Pumps (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

Country Status (7)

Families Citing this family (2)

Family Cites Families (8)

• 2007
  • 2007-09-07 DE DE202007012565U patent/DE202007012565U1/de not_active Expired - Lifetime
• 2008
  • 2008-07-28 AU AU2008298079A patent/AU2008298079A1/en not_active Abandoned
  • 2008-07-28 AT AT08785137T patent/ATE485449T1/de active
  • 2008-07-28 ES ES08785137T patent/ES2352311T3/es active Active
  • 2008-07-28 WO PCT/EP2008/006186 patent/WO2009033526A1/fr active Application Filing
  • 2008-07-28 DE DE502008001606T patent/DE502008001606D1/de active Active
  • 2008-07-28 US US12/673,282 patent/US8651844B2/en not_active Expired - Fee Related
  • 2008-07-28 EP EP08785137A patent/EP2160513B1/fr not_active Not-in-force

Non-Patent Citations (1)

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