WO2010112108A2 - Ensemble pompe à vis - Google Patents

Ensemble pompe à vis Download PDF

Info

Publication number
WO2010112108A2
WO2010112108A2 PCT/EP2010/001096 EP2010001096W WO2010112108A2 WO 2010112108 A2 WO2010112108 A2 WO 2010112108A2 EP 2010001096 W EP2010001096 W EP 2010001096W WO 2010112108 A2 WO2010112108 A2 WO 2010112108A2
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
tap
connecting line
screw pump
line
Prior art date
Application number
PCT/EP2010/001096
Other languages
German (de)
English (en)
Other versions
WO2010112108A3 (fr
Inventor
Robert Eckert
Thorsten Zellmann
Georg Leutgeb
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to US13/262,426 priority Critical patent/US20120121450A1/en
Priority to JP2012502475A priority patent/JP2012522166A/ja
Priority to CN2010800237089A priority patent/CN102449311A/zh
Publication of WO2010112108A2 publication Critical patent/WO2010112108A2/fr
Publication of WO2010112108A3 publication Critical patent/WO2010112108A3/fr

Links

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
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C2/16—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • 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
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/001—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of similar working principle
    • 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
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/02—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations specially adapted for several machines or pumps connected in series or in parallel
    • 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
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/185—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by varying the useful pumping length of the cooperating members in the axial direction
    • 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
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/10—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by changing the positions of the inlet or outlet openings with respect to the working chamber
    • 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
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves

Definitions

  • the invention relates to a screw pump arrangement according to the preamble of patent claim 1.
  • Screw pumps usually have two or three mutually parallel and intermeshing spindles which are set in rotation by a working machine (for example an electric motor).
  • the spindles are accommodated in a housing, with only minimal distances between the outer sides of the spindles and the housing.
  • the fluid to be delivered is conveyed along the spindles in the spaces which result in the thread-like intermeshing turns between the spindles and the housing. This results in a low pressure area at one end of the spindles or the housing and at the other end a high pressure area. At the same time, the fluid to be delivered penetrates into the minimum distances between the spindles and the housing and produces a load-bearing and lubricating film.
  • the spindles are not continuously coiled, but in two opposite directions divided coiled sections whose spaces move towards each other during rotation. This results in two low pressure areas at the two ends of the spindles and a high pressure area in the middle of the spindles.
  • the invention is based on the object to provide a screw pump assembly that is easy to adapt to different requirements regarding. Pump outlet pressure and flow rate.
  • the screw pump arrangement according to the invention has a high-pressure connection, a low-pressure connection, a drive spindle and at least one running spindle.
  • a conveying path of the running spindle can be divided into two conveying sections, which can be operated or flowed through either in parallel or in series.
  • two tap connections which can be connected by a connecting line, are provided on the housing in a middle region of the conveying path. see.
  • the connecting line can be shut off, and thereby the first tap connection in the conveying direction to the high pressure port and the second tap port in the conveying direction can be connected to the low pressure port.
  • the open connection line is a series circuit (higher pressure, lower flow) given, which corresponds to a screw pump according to the prior art.
  • the distance between the two tap connections along the conveying path corresponds at least to the width of the webs of the running spindles.
  • at least one web prevents pressure medium exchange between the regions of the two tap connections.
  • a directional valve is arranged in the connecting line, which is connected via a high-pressure connecting line to the high-pressure port and a low-pressure connecting line to the low-pressure port. This can be switched by valve actuation between series connection and parallel connection.
  • the pressure medium flow path between the tap connections is shut off via the connection line.
  • the first tap port is connected to the high pressure port and the second tap port is connected to the low pressure port.
  • the two tap connections are connected to each other via the connecting line.
  • a check valve is arranged in the high pressure connection line, which opens from the directional control valve to a high pressure line which connects the high pressure port to a pump outlet.
  • a pressure-limiting valve relieving pressure on a tank can be arranged on the high-pressure line.
  • the Dr ⁇ e kbegrenzungsventil be pneumatically piloted.
  • the screw pump assembly has two spindles, whose gears are coiled in the same direction.
  • the drive spindle can be driven by a constant two-pole electric motor whose manufacturing costs are lower than those of a controllable electric motor.
  • the drive spindle can be connected to increase the flexibility or adaptability of output pressure and flow with a speed-controlled electric motor, wherein a pressure sensor connected thereto can be arranged on the high-pressure line.
  • the screw pump assembly according to the invention is used to supply a machine tool with cooling lubricant.
  • the switching possibility according to the invention is particularly advantageous.
  • the series connection (higher pressure with lower volume flow) is needed with larger tools and the parallel connection (lower pressure with higher volume flow) with smaller tools. Even with different cutting performance of the machine tool, these two operating states of the pump can be used advantageously.
  • This figure shows a screw pump arrangement according to the invention. It has a known in its basic structure of the prior art screw pump 1, which is shown (in the figure) on the left and in section. Furthermore, the arrangement according to the invention changes or extensions, which are shown as a symbolic diagram and (in the figure) are shown largely right.
  • the screw pump has an elongated housing, which essentially consists of a housing main section 2 and two end housing covers 3, 4.
  • two running spindles 6 are arranged, which have minimum distances to the adjacent sections of the inner wall 8 of the housing main section 2.
  • the spindles 6 have circumferentially coiled grooves or gears 10. Between the turns of the gears 10 also circumferentially coiled webs remain 12th
  • a drive spindle 14 Centrally in the housing main section 2 and between the spindles 6, a drive spindle 14 is arranged, which also has a circumferentially coiled web 16.
  • the web 16 is the other way helically wound than the webs 12 of the spindles 6, wherein the drive spindle 14 meshes with two spindles 6.
  • a shaft portion 18 is formed, which is mounted in the (in the figure) upper housing cover 4 via a rolling bearing 20 and outside of the housing 2, 3, 4 has a connecting portion 22.
  • the drive spindle 14 can be driven by an electric motor (not shown), wherein the electric motor can be a constant motor for cost reasons or can be regulated for reasons of greater flexibility.
  • two axially spaced tap connections 28, 30 are provided in the housing main section 2 in a middle region of the conveying path extending from bottom to top (in the figure). Their dimension transversely to the conveying direction is chosen so that they are in pressure medium connection to the corresponding passage sections of the two spindles 6.
  • the two tap connections 28, 30 have an axial distance from one another in the conveying direction which corresponds at least to the thickness of the webs 16. This ensures a separation of the two tap connections 28, 30 or the pressure means located in the corresponding passage sections.
  • a spring biased position (a) of a valve body of the directional control valve 32 the low pressure port 24 via a low pressure line 34, a low pressure connecting line 36 and a second tap line 38 with the second Tap connection 30 connected. Furthermore, in the o.g. Switched position of the first tap port 28 via a first tap line 40 and a high-pressure connection line 42 connected to a high-pressure line 44.
  • the high pressure line 44 connects the high pressure port 26 to a pump outlet P.
  • a switching position (b) of the valve body which is selectable via a solenoid 46, a pressure medium flow path from the first tap port 28 via the first tap line 40, the directional control valve 32 and the second tap line 38 to the second tap port 30 released.
  • a check valve 48 is provided which opens from the directional control valve 32 to the high pressure line 44.
  • the conveying path of the two running spindles 6 can be operated essentially continuously or alternatively can be divided into two conveying sections 45a, 45b, which can be operated in parallel.
  • the parallel connection of the two conveying sections 45a, 45b is achieved in the switching position (a) of the valve body of the directional valve 32 shown in the figure.
  • the sucked at a suction port S pressure medium flow on the one hand via the low pressure line 34 to the low pressure port 24 and on the other hand via the low pressure connection line 36 and the second tap line 38 to the second tap port 30.
  • the two conveyor sections 45a, 45b of the spindles 6 are thus operated in parallel, with a first
  • the series connection of the two delivery sections 45a, 45b and a conventional operation of the screw pump arrangement according to the invention is achieved, in which the solenoid 46 is energized and the valve body of the directional control valve 32 shifts to the switching position marked b.
  • the two tap connections 28, 30 are connected to one another, wherein the pressurized pressure medium flows from the first conveying section 45a via the two tap lines 40, 38 into the second conveying section 45b of the running spindles 6.
  • the second conveying section 45b then takes place the second part of the pressure increase, wherein the pressure medium with maximum pressure from the High pressure port 26 via the high pressure line 44 to the pump outlet P flows.
  • the volume flow is relatively low, while the pressure increase is relatively large.
  • the check valve 48 arranged in the high-pressure connecting line 42 closes when the two conveying sections 45a, 45b are connected in series and opens when the two conveying sections 45a, 45b are connected in parallel, if approximately the same pressure prevails in the high-pressure connecting line 42 and in the high-pressure line 44.
  • a pressure relief valve 50 is provided, which relieves the high pressure line 44 to a tank T when an adjustable maximum pressure is exceeded.
  • the pressure relief valve 50 is pneumatically pilot operated and has a continuously adjustable proportional pressure valve.
  • an electronic pressure sensor 52 and a pressure gauge 54 for monitoring the pump outlet pressure is provided on the high-pressure line 44, the pressure being applied to the pressure gauge 54 via a throttle 56.
  • the screw pump assembly according to the invention is particularly suitable for the promotion of cooling lubricant in machine tools.
  • screw pumps are preferred because they have the greatest possible resistance to partially abrasive particles that accumulate in the cooling lubricant.
  • the maximum drive power of the (not shown) electric motor can be in the o.g. Field of application compared to the prior art be reduced by about 40%.
  • the screw pump assembly according to the invention has the advantage in addition to the lower cost that a volume flow reduction is not generated by speed reduction, whereby the carrying property of the cooling lubricant in the areas between the webs 12 and the housing main section 2 could be affected.
  • a screw pump arrangement with a low-pressure connection, a high-pressure connection, a drive spindle and at least one running spindle.
  • a conveyor line of the spindles is divisible into two conveyor sections, which can be operated either in parallel or in series.
  • connection line In a central region of the conveyor line two connectable by a connecting line tap connections are provided.
  • the connection line can be shut off, and the low-pressure-side tap connection to the high-pressure connection and the high-pressure-side tap connection can be connected to the low-pressure connection.
  • a series connection (higher pressure lower volume flow) is given, which corresponds to a screw pump according to the prior art.
  • the screw pump assembly In the closed connection line and the simultaneous above-mentioned pressure medium flow paths, the screw pump assembly can be easily operated in the parallel circuit (lower pressure higher volume flow).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Abstract

L'invention concerne un ensemble pompe à vis, comprenant un raccord basse pression, un raccord haute pression, une broche d'entraînement et au moins une broche principale. Un trajet de refoulement des broches principales peut être divisé en deux parties de refoulement qui peuvent fonctionner soit en parallèle soit en série. On obtient ainsi, de façon simple, un ensemble pompe à vis présentant deux états de fonctionnement sélectionnables, sans nécessiter de technique de régulation. Deux raccords de prélèvement pouvant communiquer par l'intermédiaire d'une conduite de raccordement sont placés dans une zone centrale du trajet de refoulement. La conduite de raccordement peut être fermée et le raccord de prélèvement côté basse pression peut être mis en communication avec le raccord haute pression tandis que le raccord de prélèvement côté haute pression peut être mis en communication avec le raccord basse pression. Lorsque la conduite de raccordement est ouverte, on obtient un circuit en série (pression élevée, débit volumétrique faible) qui correspond à une pompe à vis de la technique antérieure. Lorsque la conduite de raccordement est fermée et en présence des trajets d'écoulement de fluide sous pression mentionnés ci-dessus, l'ensemble pompe à vis peut fonctionner simplement en circuit parallèle (pression faible, débit volumétrique élevé).
PCT/EP2010/001096 2009-03-31 2010-02-23 Ensemble pompe à vis WO2010112108A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US13/262,426 US20120121450A1 (en) 2009-03-31 2010-02-23 Screw spindle pump arrangement
JP2012502475A JP2012522166A (ja) 2009-03-31 2010-02-23 ねじポンプ装置
CN2010800237089A CN102449311A (zh) 2009-03-31 2010-02-23 螺杆泵装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009015685.2 2009-03-31
DE102009015685A DE102009015685A1 (de) 2009-03-31 2009-03-31 Schraubenspindelpumpenanordnung

Publications (2)

Publication Number Publication Date
WO2010112108A2 true WO2010112108A2 (fr) 2010-10-07
WO2010112108A3 WO2010112108A3 (fr) 2010-11-25

Family

ID=42674932

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/001096 WO2010112108A2 (fr) 2009-03-31 2010-02-23 Ensemble pompe à vis

Country Status (5)

Country Link
US (1) US20120121450A1 (fr)
JP (1) JP2012522166A (fr)
CN (1) CN102449311A (fr)
DE (1) DE102009015685A1 (fr)
WO (1) WO2010112108A2 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010054401B4 (de) * 2010-12-14 2017-02-02 Grob-Werke Gmbh & Co. Kg Bearbeitungsmaschine
DE102014102390B3 (de) * 2014-02-25 2015-03-26 Leistritz Pumpen Gmbh Schraubenspindelpumpe
WO2017009994A1 (fr) 2015-07-16 2017-01-19 株式会社Ihi Pompe à engrenages triples et dispositif d'alimentation en fluide
US20180314274A1 (en) * 2017-04-28 2018-11-01 Atlas Copco Comptec, Llc Gas processing and management system for switching between operating modes
JP7072417B2 (ja) * 2018-03-27 2022-05-20 株式会社日立産機システム スクリュー圧縮機
DE102018116772B3 (de) * 2018-07-11 2019-11-07 Netzsch Pumpen & Systeme Gmbh Schraubenspindelpumpe und Verfahren zur Wartung einer solchen Schraubenspindelpumpe
DE102018130472A1 (de) * 2018-11-30 2020-06-04 Nidec Gpm Gmbh Schraubenspindelpumpe
CN111008480B (zh) * 2019-12-13 2023-05-23 湘潭大学 一种用于离心泵站扩能需求的新增泵选型方法
CN114165935B (zh) * 2021-12-13 2023-06-09 恩德特机械（苏州）有限公司 一种基于智能化控制的螺杆式冷水机组

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3920901A1 (de) 1989-06-26 1991-01-03 Allweiler Ag Schraubenspindelpumpe
DE102006061971A1 (de) 2006-12-21 2008-06-26 Leistritz Ag Doppelflutige Schraubenspindelpumpe

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1728143A1 (de) * 1968-08-30 1972-03-30 Max Streicher Exzenterschneckenpumpe
JPS5414008A (en) * 1977-07-02 1979-02-01 Sanko Ponpu Kougiyou Kk Positive displacement axial flow rotary piston
JPS61149597A (ja) * 1984-12-21 1986-07-08 Hitachi Ltd 多段圧縮機の運転制御装置
JPH05157059A (ja) * 1991-12-03 1993-06-22 Mitsubishi Heavy Ind Ltd ねじ式ポンプの制御装置
DE19945871A1 (de) * 1999-09-24 2001-03-29 Leybold Vakuum Gmbh Schraubenpumpe, insbesondere Schraubenvakuumpumpe, mit zwei Pumpstufen
ATE275470T1 (de) * 2000-05-23 2004-09-15 Bosch Rexroth Ag Antriebsvorrichtung, insbesondere für die schliesseinheit, die einspritzeinheit oder die auswerfer einer kunststoffspritzgiessmaschine
JP2002070757A (ja) * 2000-08-31 2002-03-08 Tokico Ltd 可変容量ギヤポンプ
JP2003278673A (ja) * 2002-03-26 2003-10-02 Hitachi Ltd スクリュー圧縮機
JP2004278439A (ja) * 2003-03-17 2004-10-07 Toshiba Kyaria Kk 流体機械
JP2007276525A (ja) * 2006-04-03 2007-10-25 Toyota Motor Corp 液圧源装置
JP2008291864A (ja) * 2007-05-22 2008-12-04 Yuken Kogyo Co Ltd シリンダ駆動ユニット

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3920901A1 (de) 1989-06-26 1991-01-03 Allweiler Ag Schraubenspindelpumpe
DE102006061971A1 (de) 2006-12-21 2008-06-26 Leistritz Ag Doppelflutige Schraubenspindelpumpe

Also Published As

Publication number Publication date
US20120121450A1 (en) 2012-05-17
DE102009015685A1 (de) 2010-10-07
JP2012522166A (ja) 2012-09-20
WO2010112108A3 (fr) 2010-11-25
CN102449311A (zh) 2012-05-09

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