Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D13/00—Pumping installations or systems
  • F04D13/02—Units comprising pumps and their driving means
  • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
  • F04D13/0606—Canned motor pumps
  • F04D13/0626—Details of the can
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/08—Sealings
  • F04D29/086—Sealings especially adapted for liquid pumps
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/40—Casings; Connections of working fluid
  • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
  • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/60—Mounting; Assembling; Disassembling
  • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
  • F04D29/628—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid pumps

Definitions

• the invention relates to a centrifugal pump with a spiral housing.
• the invention is further focused on the use of the centrifugal pump.
• Centrifugal pumps with spiral housings are known.
• DE 103 47 302 Al a two-part volute casing for a centrifugal pump is described, which is designed optimized flow.
• Such centrifugal pumps are usually driven by an electric motor, wherein the stator of the electric motor are arranged in a drying room and the rotor in a wet room. The rotor thus rotates in the wet space, which is surrounded by the flowing medium to be pumped.
• the drying space and the wet space are separated by a separately arranged split tube, which disadvantageously is necessary to arrange sealing elements between the one part of the spiral housing and the split tube to prevent ingress of liquid or steam from the wet room into the drying room.
• sealing elements between the one part of the spiral housing and the split tube to prevent ingress of liquid or steam from the wet room into the drying room.
• it is often impossible to prevent larger quantities of fluid from entering and flooding the drying space. This then leads to major damage to the stator and electronic components, which are also located in the dry room next to the stator.
• the invention is therefore based on the object, a
• a centrifugal pump with a spiral housing, which consists of a first housing part and a second housing part, wherein the second housing part at its, the inlet E of the inflowing medium remote from the inner receiving portion of the rotor in the wet space N is tubular and limited, wherein the second housing part outside in
• a stator is arranged in the region of the rotor in the drying space T, wherein a lid is arranged on the tubular boundary of the second housing part, wherein between the lid and the second housing part, a first seal is arranged on at least one side facing away from the wet space N with the environment communicates.
• the second housing part is tubular at its side facing away from the inlet E of the flowing medium and thus assumes the function of a split tube, on the additional separate arrangement is completely dispensed with.
• the first seal communicates with the environment at at least one side facing away from the wet space N. This means that at least a part of the seal has direct contact with the ambient air, or that in case of emergency, a flowing over the seal
• Liquid can enter directly into the environment. It has surprisingly been found that in this way an entry of liquid from the wet space N in the drying space T, and thus a flooding of the drying space T, can be completely avoided.
• By connecting the first seal with the environment is advantageously ensured that in case of decomposition of the first seal after prolonged periods of operation parts of liquid are released directly to the environment and thus can not get into the drying room T. Damage to the stator as well as damage to other electrical components in the drying space T can advantageously be avoided in this way.
• connection of the first seal with the environment through channels or openings in or on the lid.
• the first seal can be brought into contact with the environment relatively easily and without problems, which allows the advantageous use of various seal elements as the first seal.
• the stator is surrounded on the outside by a motor housing, and between the motor housing and the second housing part in the region of its tubular boundary, a second seal is arranged.
• an O-ring seal is arranged as a first seal and as a second seal. It may be advantageous to arrange the first seal and the second seal in the form of an O-ring seal directly opposite to the second housing part, but this is not absolutely necessary.
• the first seal in the form of an O-ring is then placed on the inner wall of the tubular boundary of the second housing part.
• the second seal is then arranged in the form of an O-ring on the outer wall of the tubular boundary of the second housing part. This measure facilitates the production of the centrifugal pump.
• a further preferred embodiment of the invention provides that the second housing part has a first bearing and the cover has a second bearing for the rotatable mounting of the rotor.
• the lid can form the second camp itself, or serves only to accommodate such a camp. It is advantageous that on the additional Arrangement of a special bearing ring inside the centrifugal pump can be dispensed with.
• the second housing part in the outer region of a longitudinal arc-shaped boundary perpendicular to the flow direction of the flowing from the inlet E medium.
• the exact course of the arcuate boundary is designed according to aerodynamic considerations optimized in terms of engineering. In this way, the installation space of the centrifugal pump can be particularly advantageously minimized.
• the invention is finally the use of the centrifugal pump as a cooling water centrifugal pump in one
• Coolant centrifugal pumps in motor vehicles must function flawlessly for long periods of operation, whereby flooding of the drying room T must be prevented at all costs.
• the use of the centrifugal pump as a cooling water centrifugal pump in a motor vehicle is therefore particularly advantageous.
• Fig. 2 shows the centrifugal pump in longitudinal section in three-dimensional form in the form of a
• Fig. 3 shows a centrifugal pump in longitudinal section in three-dimensional form according to the prior art.
• a centrifugal pump is shown in longitudinal section in three-dimensional form.
• the centrifugal pump points a spiral housing, which consists of a first housing part 1 and a second housing part 2, wherein the second housing part 2 at its, the inlet E of the inflowing medium remote from the inner receiving portion of the rotor 3 in the wet space N is tubular and limited.
• the flowing medium is illustrated by the thick arrow.
• a stator 4 is arranged outside in the area of the rotor 3 in the drying space T.
• a cover 5 is arranged, wherein between the cover 5 and the second housing part 2, a first seal 6 is arranged, which communicates with the environment on at least one side facing away from the wet room N side.
• the connection of the first seal 6 with the environment takes place through channels 5 'on the cover 5.
• the stator 4 is surrounded on the outside by a motor housing 7.
• a second seal 8 is arranged in the region of its tubular boundary.
• the first seal 6 and the second seal 8 are each arranged in the form of an O-ring seal.
• the second housing part 2 has a first bearing 2 * and the cover 5 a second bearing 5 * for the rotatable mounting of the rotor 3. This can be completely dispensed with an additional bearing ring.
• the second housing part 2 has in the outer region a longitudinally arcuate boundary 2 ** perpendicular to
• the second housing part 2 is tubular and bounded in a region for receiving the rotor 3 internally.
• the first seal 6 and the second seal 8 are formed as O-ring seals.
• a centrifugal pump is shown in longitudinal section three-dimensionally according to the prior art.
• the centrifugal pump according to the prior art has a spiral housing, which consists of a first housing part Ib and a second housing part 2b.
• a spiral housing which consists of a first housing part Ib and a second housing part 2b.
• the inlet Eb liquid to be conveyed medium represented by the thick arrow, enters the wet space Nb, in which the rotor 3b is rotatably mounted.
• a stator 4b is arranged externally in the drying space Tb.
• the drying space Tb is closed by a motor housing 7b from the environment.
• the separation of the wet space Nb from the drying space Tb takes place according to the prior art by the disadvantageous arrangement of a can 9b, wherein optionally an entry of liquid from the wet room Nb in the drying space Tb can be done by an adverse arrangement of a sealing ring 10b, which between the can 9b and the second housing part 2b is to be arranged.
• This then results in a disadvantageous flooding of the drying space Tb, which can already be realized, for example, if the centrifugal pump is exposed to strong shocks during operation.
• the possible entry of liquid into the drying space Tb is illustrated by the thin arrow.
• the possible flooding of the drying space Tb has direct damage to the stator 4b and other electronic components (not shown) result, which are avoided by the centrifugal pump according to the invention.

Landscapes

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

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

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Family Applications (1)

Country Status (7)

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Citations (4)

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• 2007
  • 2007-03-01 DE DE102007010051A patent/DE102007010051A1/de not_active Withdrawn
• 2008
  • 2008-02-08 US US12/529,513 patent/US20100119391A1/en not_active Abandoned
  • 2008-02-08 WO PCT/EP2008/051572 patent/WO2008104452A1/de active Application Filing
  • 2008-02-08 ES ES08716783T patent/ES2390186T3/es active Active
  • 2008-02-08 CN CN2008800067362A patent/CN101622456B/zh active Active
  • 2008-02-08 JP JP2009551159A patent/JP5074531B2/ja not_active Expired - Fee Related
  • 2008-02-08 EP EP08716783A patent/EP2126362B1/de active Active

Patent Citations (4)

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