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
  • F04C19/00—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
  • F04C19/005—Details concerning the admission or discharge
  • F04C19/008—Port members in the form of conical or cylindrical pieces situated in the centre of the impeller
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
  • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
  • F01C21/10—Outer members for co-operation with rotary pistons; Casings
• • 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
  • F04C19/00—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
• • 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
  • F04C2230/00—Manufacture
  • F04C2230/60—Assembly methods
  • F04C2230/603—Centering; Aligning
• • 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
  • F04C2240/30—Casings or housings

Definitions

• the present invention relates to a liquid ring pump.
• Such liquid ring pumps or compressors have been known for a long time and are used in a wide variety of process engineering processes. Examples include use in plants for the manufacture of plastics or pharmaceuticals, for filling beverages and for paper production.
• Liquid ring pumps or compressors work according to the displacement principle, whereby - in the most widespread design - a motor-driven impeller with blades is arranged eccentrically in a pump housing which has an interior with an essentially circular cross section.
• an operating fluid for example water
• Adjacent blades of the impeller define chambers with the liquid ring and the hub of the impeller which, due to the eccentric bearing of the impeller, have a volume which is dependent on the angular position of the chamber, the liquid ring penetrating more or less deeply into the chamber and thereby acting like a displacement piston.
• control means are provided in which openings, so-called suction and
• Pressure openings are recessed, through which the chambers communicate with the inlet and outlet of the pump.
• the suction opening is located in the angular range in which the chamber volume is increased, while the pressure opening is arranged in the angular range with a decreasing chamber volume.
• Liquid ring pumps are particularly suitable for pumping gases and vapors. To a certain extent, however, liquid flows can also be conveyed. Due to the design, when operating a liquid ring pump, a certain proportion of the operating liquid coming from the liquid ring is always conveyed.
• the operating fluid of the pump has three functions. On the one hand, as explained above, it acts as a piston of the displacement pump. Also seals the individual chambers of the impeller against each other so that oil-free delivery of the fluid to be pumped is possible. The constant conveyance of part of the operating fluid also allows the heat of compression that occurs during operation to be removed. Operating fluid must therefore be supplied continuously so that the liquid ring is kept at a constant level.
• liquid ring pump is extremely low-wear, has a high level of operational reliability and generates very little self-noise.
• Liquid ring pumps can be divided into two groups according to the type of exposure to the fluid to be pumped. So-called axially loaded pumps are the most widespread. The impeller is limited in the axial direction by control disks arranged in a rotationally fixed manner in the pump chamber, in which the suction and pressure openings are left out. The direction of flow of the fluid entering and leaving the impeller is axial, ie parallel to the axis of the pump shaft on which the impeller is seated. Examples of such axially loaded liquid ring pumps, for example pumps in a bearing support design, in a block design or in the form of a block pump attached to a bearing support, are described in the German utility model DE 298 09 258.1 U of the applicant.
• Axially loaded liquid ring pumps have found widespread use, in particular because of their comparatively simple construction compared to radially loaded pumps and the simpler and less expensive production.
• a control disk is easier to manufacture than the control hub of a radially loaded pump.
• the impeller of a radially loaded pump also requires a greater manufacturing effort, since openings must be left in the hub of the impeller for each chamber defined by the impeller blades, through which openings the fluid to be pumped can flow in or out.
• the applicant's German utility model DE 200 15 709 U1 describes an improved radially loaded liquid ring pump with a control hub.
• the pressure openings of the control hub of the known pump are at least partially provided with valves, so that pressure-dependent covering or unblocking of pressure openings is made possible.
• Conventional liquid ring pumps, both radially and axially loaded pumps are often flanged directly to a drive motor and essentially consist of a first drive-side housing part and a second front-side housing part, which are connected to one another via a tongue and groove arrangement and surround a working area , The two
• Housing parts are usually fixed together by screw connections.
• a paddle wheel driven by the motor is rotatably arranged in the work space.
• control means are provided which define a pressure and a suction space in the interior of the pump. Due to the mode of operation of the liquid ring pump, the impeller is arranged eccentrically in the work area, so that usually the two housing parts, which can also be referred to as pressure or suction housings, are eccentrically deflected with respect to the axis of rotation of the impeller which defines the pump axis. The deflection usually takes place on a large diameter on the outer circumference of the pump, as is shown, for example, in FIGS. 1 and 2 in the above
• the present invention is therefore based on the technical problem of an improved liquid ring pump, in particular an improved one
• the subject of the present application is accordingly a liquid ring pump for conveying fluids, which have a first, drive-side housing part and a second end-side housing part, which are connected to one another via a tongue and groove arrangement and surround a work area, and at least one rotatably arranged in the work area, include impeller with blades.
• the pump further comprises control means which define a suction and a pressure space inside the pump.
• the liquid ring pump according to the invention is characterized in that the tongue and groove arrangement is formed centrally to the axis of rotation of the impeller.
• the housing parts are advantageously compressed to a diameter which is smaller than the inside diameter of the working space housing and is preferably less than 90% of the inside diameter of the working space housing.
• the central tongue and groove arrangement comprises at least one groove which is concentric with the axis of rotation of the impeller and is recessed in one of the two housing parts and at least one spring which is concentric with the axis of rotation of the impeller and is provided in the other housing part.
• the tongue and groove are essentially complementary to one another and can optionally contain sealing material, such as sealing rings.
• the two housing parts are fixed to one another by a plurality of screw connections arranged on the outer circumference of the housing.
• the central deflection of the two housing parts is particularly suitable for radially loaded liquid ring pumps with a control hub, since the construction according to the invention enables precise adjustment of the impeller and control hub.
• a particularly preferred embodiment of the invention accordingly relates to a liquid ring pump in which the control means comprise at least one control hub which is arranged in a rotationally fixed manner inside the pump and which has at least one suction opening and / or at least one pressure opening.
• the pump preferably has both a suction opening and a pressure opening.
• Centrally sprung housing parts can, however, also be realized in pumps in which the control hub has, for example, only one pressure opening and the suction opening is recessed in a conventional control disk oriented perpendicular to the axis of rotation of the impeller.
• FIG. 1 Such a combined axially and radially loaded liquid ring pump is shown in FIG. 1 of the utility model DE 200 15 709 U1, however without the feature of the central deflection of the two housing parts proposed here.
• the invention can also be implemented in conventional axially loaded liquid ring pumps in which suction and pressure openings are left out in one or two control disks.
• valves can have valve flaps or valve bodies, as described again in detail in DE 200 15 709 U1, for example.
• the liquid ring pump according to the invention is advantageously provided with a single closable emptying opening, via which both the pressure chamber and the suction chamber can be emptied.
• the motor-side housing part encloses the pressure chamber and the emptying opening is arranged in the front-side housing part that surrounds the working chamber, it is advantageously provided that the lower region of the pressure chamber is geodetically essentially at the level of passages that are recessed in the impeller and which ensure that the pressure area of the work area can communicate with the pressure room.
• any liquid that may still be present in the pressure chamber can then flow out through the passages into the lower region of the working chamber, in which the drainage opening is arranged.
• a corresponding arrangement can of course also be provided if, for example, the suction chamber is located in the drive-side housing part.
• the pump according to the invention can be implemented particularly advantageously in the variants described in the utility model DE 200 15 709 U1, ie the pump can also have, for example, a downstream separator with a heat exchanger which may be connected.
• FIG. 1 shows a schematic cross section through a liquid ring pump of the prior art, in which the two housing parts are eccentrically compressed;
• Figure 2 shows a section through a preferred embodiment of the liquid ring pump according to the invention with a central deflection
• a liquid ring pump 10 according to the prior art can be seen, which is designed as a block pump.
• the pump 10 has a first housing part 11 on the drive side and a second housing part 12 on the front side.
• the front housing part 12 is designed as a pot-like housing cover, which has a suction nozzle 14 on the longitudinal axis 13 of the pump, via which the fluid to be delivered is sucked in.
• the two housing parts 11, 12 define a working space 15 in which an impeller 16 is rotatably mounted.
• the housing part 11, which has a pressure port 17, is on a (only partially shown)
• a control hub 22 is provided as the control means, which has at least one pressure opening 23 and at least one suction opening 24.
• the fluid to be conveyed is sucked through the axially arranged suction nozzle 14 into the suction chamber 25, through an axial inlet opening 26 into the control hub 22 and flows through finally, in the radial direction, the suction opening 24 of the control hub in order to reach the chambers formed between the blades 27 of the impeller 16 in the working space 15.
• the known pump has an emptying opening 36, 37 for the work space 15 and the pressure space 29, respectively.
• FIG. 2 shows a preferred embodiment of the liquid ring pump according to the invention.
• Components of the pump of FIG. 2 that correspond to components of the pump of FIG. 1 or that perform a comparable function are identified by the same reference numerals and are not explained in more detail below.
• the variant shown in FIG. 2 does not show the drive motor (reference number 18 in FIG. 1) and the drive shaft engaging in the impeller hub (reference number 19 in FIG. 1).
• the two housing parts 11, 12 are deflected concentrically to the axis of rotation of the impeller on a circumferential ring 38.
• the first housing part 11 is formed with a spring 39 which is concentric with the longitudinal axis 13 of the pump and which corresponds to the axis of rotation of the impeller 16 and which fits into a corresponding one in the second Housing part 12 recessed, concentric groove 40 engages.
• This ensures a precise assembly of the housing parts and in particular a precise adaptation of the non-rotatable control hub 22 and the rotatable impeller 16 encompassing the control hub.
• the diameter of the deflection ring is significantly smaller than the inside diameter of the work space housing 15.
• the bottom region 41 of the pressure chamber 29 ends geodetically higher in the pump according to the invention than in the known pump of FIG. 1, namely approximately at the level of the passages 31 in the impeller 16.
• any liquid present in the pressure chamber can flow into the working chamber 15 via one or more of the passages 31 and be drained via the opening 42, which can be closed, for example, by a sealing screw. There is therefore no need for a separate outlet opening for the pressure chamber, which further reduces the manufacturing costs.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)
• Fluid-Pressure Circuits (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=29557937

Family Applications (1)

Country Status (6)

Families Citing this family (7)

Family Cites Families (6)

• 2002
  • 2002-06-28 DE DE20210003U patent/DE20210003U1/de not_active Expired - Lifetime
• 2003
  • 2003-06-27 WO PCT/EP2003/006854 patent/WO2004003388A1/fr not_active Application Discontinuation
  • 2003-06-27 DE DE50302194T patent/DE50302194D1/de not_active Expired - Lifetime
  • 2003-06-27 CN CNB03818091XA patent/CN100398830C/zh not_active Expired - Fee Related
  • 2003-06-27 AT AT03740369T patent/ATE315725T1/de active
  • 2003-06-27 EP EP03740369A patent/EP1518055B1/fr not_active Expired - Lifetime
  • 2003-06-27 AU AU2003279806A patent/AU2003279806A1/en not_active Abandoned

Non-Patent Citations (1)

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