EP0845600A2 - Machine à canal latéral - Google Patents

Machine à canal latéral Download PDF

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Publication number
EP0845600A2
EP0845600A2 EP97116011A EP97116011A EP0845600A2 EP 0845600 A2 EP0845600 A2 EP 0845600A2 EP 97116011 A EP97116011 A EP 97116011A EP 97116011 A EP97116011 A EP 97116011A EP 0845600 A2 EP0845600 A2 EP 0845600A2
Authority
EP
European Patent Office
Prior art keywords
side channel
machine according
channel machine
impeller
guide wall
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Withdrawn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
EP97116011A
Other languages
German (de)
English (en)
Other versions
EP0845600A3 (fr
Inventor
Wolfgang Ellinghaus
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 EP0845600A2 publication Critical patent/EP0845600A2/fr
Publication of EP0845600A3 publication Critical patent/EP0845600A3/fr
Withdrawn legal-status Critical Current

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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
    • F04D23/00—Other rotary non-positive-displacement pumps
    • F04D23/008—Regenerative 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
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal 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
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • F04D17/168—Pumps specially adapted to produce a vacuum

Definitions

  • the invention relates to a side channel machine according to the preamble of claim 1.
  • Such a side channel machine is in DE 41 28 150 A1. It is especially for the Use in the dental field.
  • inlet-side end portion of the side channel one with respect of the pitch circle of the impeller asymmetrical guide element built-in.
  • a guide element surprisingly, a more effective take of the promoting gas, so that both the with the Side channel machine generate negative pressure as well Efficiency of the machine is improved.
  • one has in the inlet-side end section of the side channel Barrier which is a circumferential flow of the gas is prevented and thus the gas is progressively forced from the side channel into the pockets of the wheel presses.
  • the end of the side channel opens into an inlet chamber from, so you can the guide wall, which is the redirecting of the gas flow into the helical flow, form according to claims 14-22, wherein the details given in claims 15-22, respectively with a view to further improving the Side channel machine generate negative pressure or Efficiency of the side channel machine are advantageous.
  • the drawing shows an overall designated 10 Side channel suction machine for dental use with a housing which has an upper housing part 12, and a bowl-shaped having a peripheral wall 14 has lower housing part 16.
  • the latter carries you central inlet connector 18, the one with the outlet only dashed lines at 20 indicated separation unit connected is.
  • the latter separates from that of the dental Air coming into the workplace liquid and solid Components from, so that the suction machine 10 only with dry air is applied.
  • the impeller 24 is flying on the end of a motor shaft 26 stored to one at the top of the upper housing part 12 attached electric motor 28 heard.
  • the upper part of the motor housing is designated 30.
  • An upper end portion of the motor shaft 26 carries a fan wheel 32.
  • the impeller 24 has two plane-parallel end faces.
  • pockets 36 are generously rounded, rounded at the corners and have semicircular cross sections which are stretched in the middle and between which side-channel compressor blades 38 remain.
  • pockets 40 are inserted into the edge region of the lower end face of the impeller, between which side channel compressor blades 42 remain.
  • FIG. 5 seen in the rotational direction rear end of the front face of the impeller blades 38 each formed at 45 o obliquely to the center plane of the wheel 24 springing back.
  • a first side channel 44 is formed in the underside of the upper housing part 12, the angular extent (measured at its center line running in the circumferential direction) being approximately 330 °.
  • the side channel 44 has a radially obliquely outwardly extending outlet section 46, which is connected to an axial connecting channel 48 of the lower housing part 14 and leads to an inlet section 50 of a second side channel 52, which is provided in the top of the lower housing part 16 and with which Path of the compressor blades 42 is aligned.
  • the circumferential extent of the side channel 52 is again approximately 330 o, as shown in FIG. 3
  • An outlet section 54 of the side channel 52 communicates with an outlet connection 56 of the lower housing part 16.
  • webs have 45 and 53 respectively, which between the ends of the side channels 44, stop 52, a circumferential extension of 30 ° (again measured at its radial center). In other exemplary embodiments, this angular extent can be between approximately 20 ° and approximately 40 ° . With this choice of the angular extent of the webs 45 and 53, one has a satisfactory sealing of the ends of the two side channels, which are under different pressure, on the one hand, and, on the other hand, a large circumferential extent of the side channels, which is advantageous with regard to the generation of high pressure differences or high efficiency of the side channel machine .
  • a silencer 58 is inserted into the outlet connection 56, which is surrounded by a damper housing 60, which has an only schematically indicated outlet opening 62, which with a building-side exhaust duct is connected.
  • curved compressor blades 64 of a pre-compression stage provided by a curved rotationally symmetrical guide wall 66 are covered, the inlet-side end portion is axially parallel while you outlet-side section at only a small angle is employed on a transversal level.
  • the lower End faces of the compressor blades 64 fall from the edge inwards to a hub section 68 of the impeller 24 from.
  • the inlet-side end of the guide wall 66 is flush with it the upper edge of a conical inlet opening 70 of the Housing in the bottom of the lower housing part 16 is provided.
  • the inner surface of the inlet opening 70 essentially represents a smooth continuation of one conically widened end section of the inlet connector 18 represents the seal 72 on the lower housing part 12 is placed tightly and there with an axial Edge section 74 via a circular positioning rib 76 is positioned.
  • connection channel 80 stands with one axially parallel secondary air duct 84 in connection, on which a secondary air control unit 86 is connected, as indicated schematically in Figure 1.
  • a secondary air control unit 86 is connected, as indicated schematically in Figure 1.
  • An upper circumferential wall 90 of the upper housing part 12 forms together with the ceiling wall of the housing part 12 is a lower motor housing part.
  • Positioning ribs 92 jump radially from wall 90 inside over that of the casting blank for the housing part Have 12 oversize and then turned to the final dimension be that the stator 94 of the electric motor 28 is positive record, tape. By making the positioning ribs 92 turns different distances, the wall can 90 a lower motor housing part for different electric motors Form performance.
  • the connecting channel 80 opens into the radially inner boundary wall 96 of the inlet portion 82 of the side channel 44.
  • the angle of attack to this section of the boundary wall is about 60 o
  • the radially outer wall of the connecting channel 80 passes through the corner point, which the would enclose radially inner boundary wall 96 with a rear boundary wall 98 of the inlet section 82 if the boundary wall 96 were pulled through.
  • the radially inner boundary wall of the connecting channel 80 merges into the radially inner boundary wall 96 of the side channel 44 via an inclined surface 100 that widens the channel, forming an angle of approximately 30 ° .
  • the radially inner boundary wall 96 of the side channel 44 is a comparison narrow the width of the wheel bags guide wall 102 which is opposed to a continuous through its center radius jet w encloses an angle of about 40 o.
  • the baffle 102 is essentially perpendicular to the longitudinal axis of the connecting channel 80.
  • the guide wall 102 is at the bottom with its lower end of the side channel 44 is formed and extends with their end face right into the end face of the housing part 12.
  • the downstream edge of the baffle 102 is provided with a chamfer 104.
  • the circumferential direction becomes Intermediate duct 78 acted on with pre-compressed air, as described above.
  • the one from the connecting channel 80 discharged airflow can enter the inlet section Fan out and also due to the inclined surface Fan 100. Due to the baffle 102 the air flow is blocked and in to the plane of the drawing Figure 2 vertical direction upwards (i.e. in Figure 1 downward). The redirected air arrives into the pockets 40 which are in the top of the impeller 24 are provided.
  • baffle 102 Since the baffle 102 is perpendicular to the longitudinal axis of the Connection channel 80 stands, you have a good accumulation effect. Conversely, since the baffle 102 with respect to 106 marked pitch circle of the impeller and thus also tilted the curved longitudinal axis of the side channel 44 the air flow is deflected in the direction of rotation of the impeller seen progressively. Through this As a result, the baffle 102 becomes asymmetrical favors the formation of a helical flow, as they are in the stationary operation of the side channel blower only after rotating the impeller by one would result in a larger angle 24.
  • the circumference corresponds to the guide wall 102 of the circumferential extent of about three successive pockets 40 (equal to the three pockets 36).
  • FIG. 2 shows a downstream end wall 107 of the side passage 44 tilted at an angle e to a line passing through their center radius beam which is in the embodiment shown 35 °.
  • the compressed air is increasingly decoupled from the impeller and deflected in the radial direction.
  • the angle of incidence was the baffle 40 102 w o.
  • angles between 20 o and 50 o are achieved improvements over the prior art, with the range between 35 and 45 o 0 40 particularly provided, o the best results.
  • Figure 3 shows a similar coupling of the to be funded Air into the inlet section 50 of the second compressor stage.
  • the connecting channel 48 is radial Channel section 108 in connection, which the end of Side channel 52 intersects in the radial inward direction.
  • a guide wall 110 is positioned at an angle W with respect to a radius beam passing through its center. In the exemplary embodiment considered here, this is equal to the angle w, that is to say 40 ° .
  • the upper end face of the guide wall 110 again has a downstream bevel 112.
  • baffle 110 The intersection of the baffle 110 and that designated 114 Pitch circle for the lower wheel bags 36 or the lower side channel 52 is in the direction of rotation seen slightly behind the downstream boundary wall of channel section 108. This covers approximately the upper third of the baffle 110 the duct section 108 and in this area is the wall of the side channel 52 also pulled through to the baffle 110 without any openings.
  • That part of the channel section 108 that in the direction of rotation seen in front of the radial center line of the channel section 108 and radially outside the pitch circle 114 is covered by a web 116. From the median longitudinal plane the channel section 108 goes the edge of the web 116 then rectilinear in the radial direction outward to the outer end of the baffle 106, as at 118 shown.
  • the guide wall 110 again has a thickness of the compressor blades 38, 42 corresponding to the pocket width small thickness and extends again in the circumferential direction over three pockets of the impeller.
  • the end wall 120 of the side channel 52 lying at the front in the direction of rotation is tilted by an angle with respect to a radius beam passing through its center, which is denoted by E in the drawing. In the illustrated embodiment, this angle is approximately 35 ° . This promotes the decoupling of the air from the guide system formed by the impeller 24 and the side channel 52 and its deflection in the radial direction.
  • Figure 6 shows a perspective view of the transition section between the inlet section 50 of the Side channel 52 and the channel section 108 of the connecting channel 48. From this representation the web 116 again particularly clearly.
  • the exemplary embodiment according to FIG. 7 shows a modified one Transition point between the connecting channel 80 and the side channel 44 of the first compressor stage.
  • the guide wall 102 now has a radially inner one Wall section 122, the concave seen in the direction of rotation is curved.
  • the end of the wall section 122 is correct essentially coincides with a radius line.
  • a curve 124 shows that over the volume flow applied negative pressure, such as with a side channel suction machine obtained according to DE 41 28 150 A1 becomes.
  • a curve 126 corresponds to a side channel suction machine with the same dimensions, but in the Inlet portions of the side channels of the baffles 102 and 110 were provided. You can see a clear one Improve suction power and that on the right Ordinates of readable efficiency.
  • Curve 128 now shows the working characteristics of one Side channel suction machine, which is used to extract the Curve 126 corresponds to the suction machine used with the only difference that the radial clearance by 0.15 mm was enlarged and the column enlarged by 0.1 mm has been. It can be seen that this is clearly due to the higher game much cheaper to manufacture suction machine in their performance still above that as a starting point serving more expensive to manufacture suction machine is improved, which corresponds to curve 124.
  • a semi-cylindrical Wall 132 provides a continuation in inlet chamber 130 of the side channel.
  • a bottom wall 134 of the inlet chamber 130 has a recess 136 leading to the pockets 138 of an impeller 140 is open.
  • baffle 142 which is the shape of a quarter of a narrow End of the closed truncated cone, as in FIG. 10 shown, the pockets 138 become asymmetrical again aerated, which is the rapid formation of a spiral toroidal flow is beneficial.
  • baffle 142 can then be in one reinforce the next step by referring to the Guide wall 142 attaches a depending guide wall 146, which essentially follows the pitch circle of the impeller.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Soil Working Implements (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP97116011A 1996-11-29 1997-09-15 Machine à canal latéral Withdrawn EP0845600A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19649529A DE19649529A1 (de) 1996-11-29 1996-11-29 Seitenkanalmaschine
DE19649529 1996-11-29

Publications (2)

Publication Number Publication Date
EP0845600A2 true EP0845600A2 (fr) 1998-06-03
EP0845600A3 EP0845600A3 (fr) 1999-03-10

Family

ID=7813146

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97116011A Withdrawn EP0845600A3 (fr) 1996-11-29 1997-09-15 Machine à canal latéral

Country Status (3)

Country Link
US (1) US6086325A (fr)
EP (1) EP0845600A3 (fr)
DE (1) DE19649529A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2253851A3 (fr) * 2009-05-16 2014-07-09 Pfeiffer Vacuum GmbH Pompe à vide

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU738340B2 (en) * 1997-11-10 2001-09-13 Sterling Fluid Systems (Germany) Gmbh Side-channel centrifugal pump
DE10249244B4 (de) * 2002-10-23 2014-04-10 DüRR DENTAL AG Laufrad für eine Seitenkanalmaschine
DE102004049613A1 (de) * 2004-10-12 2006-04-13 Seleon Gmbh Seitenkanalverdichter sowie Gehäuseschalen und Laufrad hierfür
JP4671844B2 (ja) * 2005-05-27 2011-04-20 株式会社日立産機システム ブロワ
DE102005042228B4 (de) * 2005-09-05 2015-07-23 DüRR DENTAL AG Saugmaschine
DE102010061994A1 (de) 2010-11-25 2012-05-31 Gardner Denver Deutschland Gmbh Gebläse-Anordnung
DE102012023347B3 (de) * 2012-11-29 2014-01-30 Tni Medical Ag Kleiner, geräuscharmer Seitenkanalverdichter, insbesondere für Geräte in der Beatmungstherapie
GB2641916A (en) * 2024-06-18 2025-12-24 Edwards Ltd Vacuum pump

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4128150A1 (de) 1991-08-24 1993-02-25 Duerr Dental Gmbh Co Kg Saugmaschine, insbesondere fuer dentalen einsatz

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3356033A (en) * 1965-10-22 1967-12-05 Ford Motor Co Centrifugal fluid pump
JPS4921705A (fr) * 1972-06-21 1974-02-26
SE444350B (sv) * 1981-02-10 1986-04-07 Dustcontrol Ab Sidokanalpump med oppet lophjul
JPS63223388A (ja) * 1987-03-12 1988-09-16 Honda Motor Co Ltd ポンプ装置
EP0384935B1 (fr) * 1989-03-03 1992-11-11 Webasto AG Fahrzeugtechnik Soufflante à canal latéral
US5358373A (en) * 1992-04-29 1994-10-25 Varian Associates, Inc. High performance turbomolecular vacuum pumps
DE4424629C1 (de) * 1994-07-13 1995-03-09 Becker Kg Gebr Seitenkanalverdichter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4128150A1 (de) 1991-08-24 1993-02-25 Duerr Dental Gmbh Co Kg Saugmaschine, insbesondere fuer dentalen einsatz

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2253851A3 (fr) * 2009-05-16 2014-07-09 Pfeiffer Vacuum GmbH Pompe à vide

Also Published As

Publication number Publication date
DE19649529A1 (de) 1998-06-04
US6086325A (en) 2000-07-11
EP0845600A3 (fr) 1999-03-10

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