EP2580480A1 - Dispositif pour l'aspiration ou la compression d'un fluide de travail - Google Patents

Dispositif pour l'aspiration ou la compression d'un fluide de travail

Info

Publication number
EP2580480A1
EP2580480A1 EP11720731.6A EP11720731A EP2580480A1 EP 2580480 A1 EP2580480 A1 EP 2580480A1 EP 11720731 A EP11720731 A EP 11720731A EP 2580480 A1 EP2580480 A1 EP 2580480A1
Authority
EP
European Patent Office
Prior art keywords
working
electric motor
working channel
air
radial
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11720731.6A
Other languages
German (de)
English (en)
Inventor
Andreas HÄGELE
Jürgen Schnepf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Duerr Dental SE
Original Assignee
Duerr Dental SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Duerr Dental SE filed Critical Duerr Dental SE
Publication of EP2580480A1 publication Critical patent/EP2580480A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • F04D29/664—Sound attenuation by means of sound absorbing material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/10—Centrifugal pumps for compressing or evacuating
    • F04D17/12—Multi-stage pumps
    • F04D17/122—Multi-stage pumps the individual rotor discs being, one for each stage, on a common shaft and axially spaced, e.g. conventional centrifugal multi- stage compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F04D25/082—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provision for cooling the motor
    • 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/5806—Cooling the drive system

Definitions

  • the invention relates to a device for aspirating or compressing a working fluid, in particular for dental and medical purposes, according to the preamble of claim 1.
  • such devices can be used as suction machines or compressors.
  • a suction unit which comprises a pump unit which is driven by an external rotor electric motor which is offset axially to the pump.
  • the electric motor is cooled by ambient air.
  • the object of the invention is in contrast to provide a device that enables improved cooling of the electric motor.
  • the working fluid flowing in the working channel from the working fluid inlet to the working fluid outlet is also used for cooling the electric motor.
  • the heat of the electric motor via a thermally coupled to the electric motor boundary wall of the working channel to this flowing through the working fluid, usually air, meetge ⁇ ben. Since the working channel at least partially surrounds the electric motor, effective cooling is achieved.
  • This efficient cooling of the engine allows the construction of small-sized devices for suction or compression with high-speed centrifugal fans, which allow high suction power with small dimensions and therefore can be used directly on a dental treatment center. This is not possible with conventional side channel blowers, which build radially large and therefore must be accommodated in separate rooms. Mobile devices for dental and medical purposes can also be realized in this way.
  • the working channel surrounds the entire jacket of the motor and extends over its entire length, so that a large-area cooling takes place. Due to the cooling of the engine by the conveyed air cooling by ambient air can be dispensed with, whereby a noise-insulating encapsulation of the device can be provided.
  • the development of the device according to claim 4 enables the production of the boundary wall of the working channel made of materials which have a high thermal conductivity.
  • the working channel and the spaced peripheral wall by an extrusion Profilabab section or an injection molded part made of aluminum or iron or a sheet metal structure may be formed.
  • the device according to claim 5 has a working channel, which remains dimensionally stable under negative pressure and not ver formed when exposed to pressure or negative pressure ver.
  • the arrangement of webs allows the use of thin-walled and thus easily constructing boundary walls.
  • the webs are also ausgestaltbar as a guide for the flowing air.
  • the webs can, for example, be formed at the same time as vanes.
  • the pump unit draws in air via a bypass, in particular a bypass valve, and moves it through the working channel, as a result of which the engine is still cooled.
  • the bypass valve is For example, a spring-loaded or a magnetically switched valve.
  • the cooling of the electric motor is further improved, since the rotor of the electric motor is cooled.
  • the development of the device according to claim 9 allows feeding of the cooling air through the working channel through under separation of working fluid and cooling air.
  • Claim 10 ensures that the rotor gap is not added by impurities.
  • a fan wheel arranged on the rotor of the electric motor conveys cooling air into the gap between rotor and stator. It can promote the cooling air pulling or pushing.
  • the apparatus according to claim 13 can be dispensed with an additional fan, since one of the delivery stages of the working unit in addition to the working fluid also promotes the cooling air for the gap between the rotor and stator.
  • the development of the invention according to claim 14 provides good cooling for an electronic control unit of the device.
  • the control unit also outputs the heat generated in it via a thermally well-conductive boundary wall section to the pumped working air. Adequate cooling can be ensured even with a control unit arranged in a sound-insulating layer.
  • the suction unit according to claim 15 and 16 radiates little sound and can therefore be operated directly in the treatment room. This short, cost-effective lines between the device and a hand-held suction can be realized.
  • a shell-shaped shell of a sound-insulating material made of plastic or sheet metal also forms a cost-effective housing and protects the insulating material from damage.
  • the device is arranged in a portable housing, then it is also suitable for mobile use.
  • a device according to claim 17 is characterized by small size and low weight, which in ⁇ example, an installation in a dental chair is made possible.
  • the suction device claim 18 has small radial dimensions sufficient for a dental treatment ⁇ place suction power.
  • the running ⁇ wheel a radial working unit comprises two components made of different materials and that a wheel disc, preferably an aluminum disc, and a composite with this ⁇ preferably made of plastic blade part to which the fan blades are molded.
  • This composite design enables the cost-effective production of stable impellers with complex blade geometries.
  • the cross-section of the working channel is dimensioned so that on the one hand a good cooling effect is obtained and the flow resistance is low, on the other hand, the device has compact radial dimensions.
  • FIG. 1 is a schematic representation of a dental suction unit with a two-stage radial pump, which has arranged on both sides of the rotor Radialaufrä-;
  • Figure 2 is an alternative to Figure 1 embodiment with arranged on one side of the rotor radial impellers.
  • FIG. 3 shows a longitudinal section of a suction unit operating according to the principle shown in FIG. 1, wherein the radial impellers comprise a wheel disc and a blade part;
  • Fig. 4 is a plan view of the blade part
  • Fig. 5 is a side view of the blade part
  • Fig. 6 is a plan view of the wheel disc
  • Fig. 7 is a perspective view of a according to the in
  • FIG. 1 shown principle working suction unit
  • FIG. 8 is a view of the suction unit of Figure 7, die ⁇ hen in the opposite axial direction. and Fig. 9, the suction unit of Figure 7 and Figure 8 in a sectional view.
  • a suction unit shown in FIG. 1 comprises an electric motor 14, which is arranged in a schematically illustrated, substantially cylindrical housing 18.
  • the electric motor 14 is an internal rotor motor and rotates in the range between 14,000 rpm to 18,000 rpm.
  • the housing 18 comprises a cylindrical peripheral wall 20, which is closed on both sides with lids 22, 24.
  • the lid 22 has openings 23.
  • a stator 26 of the electric motor 14 is pressed into the peripheral wall 20.
  • a rotor 28 is mounted in the covers 22, 24 in bearings, not shown. Both ends of the rotor 28 project beyond the housing 18 and each carry a radial impeller 30 and 32.
  • a housing-fixed guide element 34 is arranged in front of the radial impeller 30 with respect to a flow direction 36 shown by arrows.
  • the electric motor 14, the housing 18 and the radial bearing wheels 30, 32 are arranged in a pump housing 38, which has an air inlet 40 (intake opening) and an air outlet 42 (discharge opening).
  • a peripheral wall 37 of the pump housing 38 is arranged radially spaced from the peripheral wall 20 of the motor housing 18. Between the peripheral wall 37 and the peripheral wall 20 is thus obtained a working channel 39 with an annular cross section for the air to be conveyed (working air).
  • the pump housing 38 In addition to the air inlet 40 is in the pump housing 38 also has a spring-loaded secondary air valve 41 as a bypass valve provided, which is in communication with the working channel 39.
  • a tubular radial web 44 is arranged between the peripheral wall 20 and the peripheral wall 37.
  • the web 44 establishes a connection between the internal volume of the housing 18 accommodating the electric motor 14 and the environment via an opening in the peripheral wall 20 and an opening in the peripheral wall 37.
  • a filter 46 is inserted in the web 44.
  • an electronic control unit 45 On the side remote from the working channel 39, radially outer side of the peripheral wall 37, an electronic control unit 45 is arranged. It controls or regulates the speed of the electric motor 14 and other operating parameters.
  • the control unit 45 also stores various selectable operating parameter sets.
  • An insulating layer 47 which may include foam material and other sound-insulating or absorbent materials, substantially completely surrounds the above described suction unit; only the openings of the air inlet 40, the air outlet 42 and a passage 49 to the web 44 are recessed in the insulating layer 47.
  • FIG. 4 to 6 show how the radial impeller 30 essentially consists of a wheel disc 31 made of a more rigid material such as aluminum and a blade part 33 made of plastic. On the blade part 33 while blades 35 are arranged, which run from a feed hole 88 in the center with a radial component to the outside. By means of integrally formed fastening pins 90, the blade part is attached to mounting holes 92 of the wheel disc 31 ⁇ 33rd
  • the radial impeller 32 driven by the electric motor 14 sucks in working air via the air inlet 40 from a suction cannula via a liquid and / or solids separator and compresses it.
  • the air flows in the working channel 39 in the direction of the guide element 34, which supplies the air flow 36 to the center of the radial impeller 30.
  • the radial ⁇ impeller 30 also driven by the electric motor 14 compresses the supplied air and forms a second compressor stage. From the air outlet 42, the working air, optionally via a leading out of the installation of the suction unit exhaust duct, discharged to the environment.
  • suction unit as a compressor.
  • filtered ambient air is sucked in via the air inlet 40 and the compressed air obtained at the air outlet 42 is fed to a collection container (not shown).
  • the working air flowing in the working channel 39 cools the stator 26 of the electric motor 14 via the peripheral wall 20 and the control unit 45 via the peripheral wall 37.
  • the radial impeller 30 also sucks via the openings 23, the housing 18, the hollow web 44, the filter 46 and the opening 49 cooling air from the environment, pulls them through the gap between the rotor 28 and stator 26th and gives them together with the working air in the air outlet 42.
  • the air purified by the filter 46 flows through between the stator 26 and the rotor 28 and cools these components.
  • hollow webs 44 and Publ ⁇ openings 49 may be provided for the suction of cooling air.
  • the lumen of a web 44 can also be used as a cable feed to the electric motor.
  • the insulating layer 47 reduces the sound radiation of the suction unit. This applies to flow noises and / or running noises caused by the electric motor 14 and / or the radial impellers 30, 32.
  • FIG. 2 schematically shows a modified suction unit similar to FIG. 1, which is shown in detail in FIGS. 7 to 9. Components with the same function are again denoted by the same reference numerals as in FIG. 1 and will not be described again in detail.
  • the suction unit according to FIGS. 2 and 7 to 9 have an electric motor 14 whose rotor 28 has two radial impellers 30 on a front side, located on the left in FIG. 32 and on the rear, in Figure 2 right side a fan 48 drives. Between the two radial impellers 30, 32 a housing-fixed guide element 34 is arranged.
  • the electric motor 14 is pressed into a peripheral wall 20, which is surrounded according to the description of FIG. 1 by a radially spaced circumferential wall 37. This is between the peripheral wall 37 and the peripheral wall 20 again a working channel 39th
  • the hollow web 44 containing the filter 46 connects the surroundings to the interior of the housing 18.
  • the insulating layer 47 in Figure 2 has a further opening through which the fan 48 blows out. In this way, the flow paths for cooling air and working air are separated from each other in the embodiment of Figure 2.
  • the housing is closed on the side facing the air inlet 40 by a cover 24 integrally formed on the circumferential wall 20.
  • the other side of the housing 18 is closed by a metal cover 22 having openings 23.
  • the peripheral wall 20 is connected via an annular integrally formed bottom 54 with the peripheral wall 37.
  • the component comprising the peripheral wall 20, the bottom 54, the cover 24 and the peripheral wall 37 is a one-piece aluminum injection molded part.
  • the rotor 28 is supported by ball bearings 50 disposed in the covers 22, 24, and a radial sealing ring 52 (eg, an Simmerring) seals the housing 18 housing the electric motor 14 from the air inlet space.
  • a circumferential skirt 56 of the guide element 34 is connected to the U wall 37. Furthermore, a cover 58 carrying the air inlet 40 is pushed onto the surrounding skirt 56.
  • tabs 60 are arranged which are connected to one another via screws 62.
  • screws 62 By means of the screws 62 so the above-mentioned aluminum injection molded part with the guide element 34 and the end cover 58 is braced.
  • control unit 45 arranged analogously to FIG. 1 in FIG. 2 is not shown in FIGS. 7 to 9 for better clarity . The same applies to the
  • Insulation used insulating layer 47 Insulation used insulating layer 47.
  • the radial impeller 32 sucks the working air via the air inlet 40, compresses it and presses it in the direction of the inner surface of the end cover 58.
  • the guide element 34 supplies the working air to a radial impeller 30 arranged centrally in the intake opening. Thereafter, the second radial impeller 30 compresses the working air again and pushes them outward in the direction of the inner wall of the circumferential skirt 56 of the guide element 34.
  • the working air From there, it continues to flow through the working channel 39 to the air outlet 42.
  • the working air cools the stator 26 of the electric motor 14 via the circumferential wall 20.
  • the fan 48 generates a negative pressure in the interior of the housing 18 so that cooling air is sucked from the environment through the gap between the stator 26 and the rotor 28 via the web shown in Figure 2 and not visible in Figure 9, which together with the cooling of the Stators 28 by working air for ⁇ high-performance engines ⁇ reaching overall cooling capacity can be ensured.
  • an external fan driven by an additional electric motor is provided in or in front of the web 44 shown in FIG. 2 and presses cooling air into the gap between the stator 26 and the rotor 28.
  • the external fan may be provided to the fan 48 to ⁇ additionally or alternatively, depending on the cooling requirements of the electric motor.
  • the external fan may be suction-connected to the cooling air outlet.
  • the fan 48 of Figure 9 blows only cooling air from the environment against the face of the electric motor 14. Due to the lack of cooling air flow in the gap between the stator 26 and the rotor 28, this arrangement is more suitable for suction units lesser Leis ⁇ tion.
  • an internal rotor motor as Elektromo ⁇ tor 14 can also provide an electronically commutated DC motor.
  • the necessary converter can either be arranged outside the device or as part of the control unit 45 also from
  • suction units In the description of embodiments, reference has been made above to suction units. It is understood that the statements apply mutatis mutandis to compressor units.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

L'invention concerne un dispositif pour l'aspiration ou la compression de l'air, comprenant un conduit de travail (39) qui relie une entrée de fluide de travail (40) et une sortie de fluide de travail (42). Une unité de travail (30, 32, 34), disposée dans le conduit de travail (39), est entraînée par un moteur électrique (14) qui comprend un rotor (28) et un stator (26). En vue de refroidir le moteur électrique (14) par l'air à transporter, une paroi de limitation (20) du conduit de travail (39) entoure le moteur électrique (14).
EP11720731.6A 2010-06-12 2011-05-21 Dispositif pour l'aspiration ou la compression d'un fluide de travail Withdrawn EP2580480A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010023462A DE102010023462A1 (de) 2010-06-12 2010-06-12 Vorrichtung zum Absaugen oder Verdichten eines Arbeitsfluids
PCT/EP2011/002542 WO2011154092A1 (fr) 2010-06-12 2011-05-21 Dispositif pour l'aspiration ou la compression d'un fluide de travail

Publications (1)

Publication Number Publication Date
EP2580480A1 true EP2580480A1 (fr) 2013-04-17

Family

ID=44351385

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11720731.6A Withdrawn EP2580480A1 (fr) 2010-06-12 2011-05-21 Dispositif pour l'aspiration ou la compression d'un fluide de travail

Country Status (3)

Country Link
EP (1) EP2580480A1 (fr)
DE (1) DE102010023462A1 (fr)
WO (1) WO2011154092A1 (fr)

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DE102012213598B3 (de) * 2012-08-01 2013-11-14 Eberspächer Climate Control Systems GmbH & Co. KG Gebläse, insbesondere Verbrennungsluftgebläse für ein Fahrzeugheizgerät
DE102013108826B4 (de) * 2013-08-14 2016-09-08 ABT System GmbH Verdichter mit versenktem Elektromotor
DE102014205210B4 (de) 2014-03-20 2018-08-09 Eberspächer Climate Control Systems GmbH & Co. KG Gebläsegehäuse, insbesondere für ein Verbrennungsluftgebläse eines Fahrzeugheizgerätes und Gebläse
JP6798011B2 (ja) 2017-04-19 2020-12-09 三菱電機株式会社 電動送風機、電気掃除機、及び手乾燥装置
US11421708B2 (en) * 2018-03-16 2022-08-23 Carrier Corporation Refrigeration system mixed-flow compressor
CN111486107B (zh) * 2019-01-29 2022-01-04 青岛海尔智能技术研发有限公司 离心压缩机、热泵系统
WO2020236581A1 (fr) * 2019-05-23 2020-11-26 Carrier Corporation Compresseur à flux mixte de système de réfrigération
EP3933207B1 (fr) * 2020-06-29 2025-11-26 Dürr Dental SE Ventilateur médical avec système d'isolation acoustique, en particulier pour usage dentaire
DE102023210204A1 (de) * 2023-10-18 2025-04-24 Zf Cv Systems Global Gmbh Gebläse für eine Brennstoffzellenanordnung
DE102023211217A1 (de) * 2023-11-13 2025-05-15 Magna Pt B.V. & Co. Kg Elektrische Verdichtereinheit sowie Montageverfahren für einen Inverters

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US5350039A (en) * 1993-02-25 1994-09-27 Nartron Corporation Low capacity centrifugal refrigeration compressor
US5363674A (en) * 1993-05-04 1994-11-15 Ecoair Corp. Zero superheat refrigeration compression system
RU2150609C1 (ru) * 1999-02-18 2000-06-10 Научно-исследовательский институт низких температур при МАИ Центробежный компрессорный агрегат и электродвигатель
DE10010077A1 (de) 2000-03-02 2001-09-06 Duerr Dental Gmbh Co Kg Saugeinheit
KR100414110B1 (ko) * 2001-09-25 2004-01-07 엘지전자 주식회사 터보 압축기의 베어링 냉각구조

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Also Published As

Publication number Publication date
WO2011154092A1 (fr) 2011-12-15
DE102010023462A1 (de) 2011-12-15

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