US20050058554A1 - Connection element - Google Patents

Connection element Download PDF

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Publication number
US20050058554A1
US20050058554A1 US10/939,055 US93905504A US2005058554A1 US 20050058554 A1 US20050058554 A1 US 20050058554A1 US 93905504 A US93905504 A US 93905504A US 2005058554 A1 US2005058554 A1 US 2005058554A1
Authority
US
United States
Prior art keywords
connection
members
clamp
set forth
unchangeable
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.)
Abandoned
Application number
US10/939,055
Inventor
Peter Fahrenbach
Robert Watz
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.)
Pfeiffer Vacuum GmbH
Original Assignee
Pfeiffer Vacuum 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 Pfeiffer Vacuum GmbH filed Critical Pfeiffer Vacuum GmbH
Assigned to PFEIFFER VACUUM GMBH reassignment PFEIFFER VACUUM GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FAHRENBACH, PETER, WATZ, ROBERT
Publication of US20050058554A1 publication Critical patent/US20050058554A1/en
Abandoned 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
    • F04D19/00—Axial-flow pumps
    • F04D19/02—Multi-stage pumps
    • F04D19/04—Multi-stage pumps specially adapted to the production of a high vacuum, e.g. molecular pumps
    • F04D19/042—Turbomolecular vacuum 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
    • F04D29/601—Mounting; Assembling; Disassembling specially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B2/00—Friction-grip releasable fastenings
    • F16B2/02—Clamps, i.e. with gripping action effected by positive means other than the inherent resistance to deformation of the material of the fastening
    • F16B2/06—Clamps, i.e. with gripping action effected by positive means other than the inherent resistance to deformation of the material of the fastening external, i.e. with contracting action
    • F16B2/12—Clamps, i.e. with gripping action effected by positive means other than the inherent resistance to deformation of the material of the fastening external, i.e. with contracting action using sliding jaws
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B33/00—Features common to bolt and nut
    • F16B33/06—Surface treatment of parts furnished with screw-thread, e.g. for preventing seizure or fretting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L23/00—Flanged joints
    • F16L23/02—Flanged joints the flanges being connected by members tensioned axially
    • F16L23/036—Flanged joints the flanges being connected by members tensioned axially characterised by the tensioning members, e.g. specially adapted bolts or C-clamps

Definitions

  • connection elements e.g., a clamp
  • a connection element for connecting two parts and, in particular for connecting an external component with a vacuum pump including a high-speed rotor and stationary and rotatable components arranged in a pump housing having a connection component, with the connection element including a first member engageable with the external component, and a second member engageable with the connection component provided on the pump housing, and with the first and second members being slidable relative to each other during connection of the external component with the vacuum pump.
  • Vacuum pumps with a high-speed rotor such as, e.g., turbomolecular pumps, store in the rotor, because of its high speed, a large amount of energy.
  • this energy is transmitted over stationary components, such as, e.g., a connection flange or bottom parts, to other components of an installation.
  • the generated torque can cause damage or destroy the parts of the installation which are connected with the vacuum pump.
  • the generated torque can cause the tearing of the pump off, its rotation on the installation, or the tearing off of the connection elements of the pump which is dangerous for the personnel.
  • the connections between the vacuum pumps and, e.g., an installation is effected with clamps. They are tightened with locking bolts, which results in preload of the connected parts.
  • the preload plays a crucial role in a torsional resistance of the components. It depends in a significant manner on the frictional resistance of threaded connections and of contact parts of the clamp. The frictional resistance itself depends from a respective material pairing and from condition of contacting each other surfaces.
  • the preload reduces, with repeated assembly and disassembly, the constancy of the tightening torque.
  • an object of the present invention is to provide a connection element, in particular for vacuum pumps with a high-speed rotor, and which would insure a reliable connection of the vacuum pump, e.g., with an installation, e.g., for bottom connection or for connection of pump parts arranged beneath one another.
  • Another object of the present invention is to provide a connection element for vacuum pumps with a high-speed rotor and which would prevent any serious damage upon a rotor/stator crash.
  • connection element in which the slidable relative to each other surfaces have a predetermined and unchangeable frictional resistance.
  • the preload remains constant.
  • the connection of the vacuum pump with an external component, with bottom connections, or between separate sections of stationary components is substantially more reliable than with conventional means. Serious damages, upon a rotor/stator crash, are prevented.
  • FIGURE shows a cross-sectional view of a locking bolt according to the present invention for a vacuum pump with a high-speed rotor.
  • a first member 1 of the clamp which is provided with a groove 2 and which engages a part 7 (e.g., of a vacuum installation), slides in a second member 3 of the clamp.
  • the second member 3 is likewise provided with a groove, groove 4 , which engages a flange of a vacuum pump 8 .
  • the lower end of the clamp member 1 is provided with a thread 6 that cooperates with a nut 5 for locking both members 1 and 3 together.
  • the surfaces of the clamp members 1 and 3 slide relative to each other.
  • the surfaces of the thread 6 and of the clamp members at a location 9 have a predetermined and unchangeable frictional resistance.
  • the material used for the manufacturing of respective components can be the same or different.
  • a portion of the surfaces or all of the surfaces can be provided with a coating with integrated lubrication means.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Non-Positive Displacement Air Blowers (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Rotary Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

A connection element for connecting two parts, in particular, an external component with a vacuum pump, includes a first member engageable with the external component, and a second member engageable with the connection component provided on the pump housing, with the first and second members being slidable relative to each other during connection of the external component with the vacuum pump and having slidable relative to each other surfaces having a predetermined and unchangeable frictional resistance.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The present invention relates to a connection elements, e.g., a clamp, for connecting two parts and, in particular for connecting an external component with a vacuum pump including a high-speed rotor and stationary and rotatable components arranged in a pump housing having a connection component, with the connection element including a first member engageable with the external component, and a second member engageable with the connection component provided on the pump housing, and with the first and second members being slidable relative to each other during connection of the external component with the vacuum pump.
  • 2. Description of the Prior Art
  • Vacuum pumps with a high-speed rotor, such as, e.g., turbomolecular pumps, store in the rotor, because of its high speed, a large amount of energy. Upon rotor/stator crash, this energy is transmitted over stationary components, such as, e.g., a connection flange or bottom parts, to other components of an installation. The generated torque can cause damage or destroy the parts of the installation which are connected with the vacuum pump. The generated torque can cause the tearing of the pump off, its rotation on the installation, or the tearing off of the connection elements of the pump which is dangerous for the personnel.
  • In the vacuum installation, usually, during a crash, leakage takes place. The leakage adversely affects the conducted process and, therefore, the process should be interrupted. Moreover, if toxic gases are involved, the leakage leads to contamination of the environment.
  • Conventionally, the connections between the vacuum pumps and, e.g., an installation is effected with clamps. They are tightened with locking bolts, which results in preload of the connected parts. The preload plays a crucial role in a torsional resistance of the components. It depends in a significant manner on the frictional resistance of threaded connections and of contact parts of the clamp. The frictional resistance itself depends from a respective material pairing and from condition of contacting each other surfaces. In addition, with a repeated assembly, because of wear, the helical thread can become blocked, or the clamp members can become blocked. The preload reduces, with repeated assembly and disassembly, the constancy of the tightening torque.
  • Accordingly, an object of the present invention is to provide a connection element, in particular for vacuum pumps with a high-speed rotor, and which would insure a reliable connection of the vacuum pump, e.g., with an installation, e.g., for bottom connection or for connection of pump parts arranged beneath one another.
  • Another object of the present invention is to provide a connection element for vacuum pumps with a high-speed rotor and which would prevent any serious damage upon a rotor/stator crash.
    • SUMMARY OF THE INVENTION
  • These and other objects of the present invention, which will become apparent hereinafter, are achieved by providing a connection element in which the slidable relative to each other surfaces have a predetermined and unchangeable frictional resistance.
  • Because of the predetermined and unchangeable frictional resistance of the sliding, relative to each other, surfaces, even with a repeated assembly, the preload remains constant. Thereby, the connection of the vacuum pump with an external component, with bottom connections, or between separate sections of stationary components, is substantially more reliable than with conventional means. Serious damages, upon a rotor/stator crash, are prevented.
  • The novel features of the present invention, which are considered as characteristics for the invention, are set forth in the appended claims. The invention itself, however, both as to its construction and its mode of operation, together with additional advantages and objects thereof, will be best understood from the following detailed description of a preferred embodiment, when read with reference to the accompanying drawings.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • In the Drawings:
  • Single FIGURE shows a cross-sectional view of a locking bolt according to the present invention for a vacuum pump with a high-speed rotor.
    • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • In the drawing, there is shown a preferred embodiment of a connection element according to the present invention by way of a clamp. A first member 1 of the clamp, which is provided with a groove 2 and which engages a part 7 (e.g., of a vacuum installation), slides in a second member 3 of the clamp. The second member 3 is likewise provided with a groove, groove 4, which engages a flange of a vacuum pump 8. The lower end of the clamp member 1 is provided with a thread 6 that cooperates with a nut 5 for locking both members 1 and 3 together. At a location 9, the surfaces of the clamp members 1 and 3 slide relative to each other. The surfaces of the thread 6 and of the clamp members at a location 9 have a predetermined and unchangeable frictional resistance. This can be achieved by a proper selection of materials or by providing the surfaces of the involved components with an appropriate coating, respectively. The material used for the manufacturing of respective components can be the same or different. A portion of the surfaces or all of the surfaces can be provided with a coating with integrated lubrication means.
  • Though the present invention was shown and described with references to the preferred embodiment, such is merely illustrative of the present invention and is not to be construed as a limitation thereof and various modifications of the present invention will be apparent to those skilled in the art. It is therefore not intended that the present invention be limited to the disclosed embodiment or details thereof, and the present invention includes all variations and/or alternative embodiments within the spirit and scope of the present invention as defined by the appended claims.

Claims (12)

1. A connection element for connecting an external component with a vacuum pump including a high-speed rotor and stationary and rotatable components arranged in the pump housing having a connection component, the connection element comprising a first member engageable with the external component; and a second member engageable with the connection component provided on the pump housing, the first and second members being slidable relative to each other during connection of the external component with the vacuum pump and having slidable relative to each other surfaces having a predetermined and unchangeable frictional resistance.
2. A connection element as set forth in claim 1, wherein the slideable relative to each other surfaces of the first and second members are provided with a coating having a predetermined and unchangeable frictional resistance.
3. A connection element as set forth in claim 1, wherein the first and second members are formed of materials surfaces of which have a predetermined and unchangeable frictional resistance.
4. A connection element as set forth in claim 3, wherein the first and second members are formed of different materials the surfaces of which have, in cooperation with each other, a predetermined and unchangeable frictional resistance.
5. A connection element as set forth in claim 1, wherein the connection element is formed as a clamp.
6. A connection element as set forth in claim 2, wherein the coating includes integrated lubrication means.
7. A clamp for connecting two parts having respective connection components, the clamp comprising a first member engageable with a connection component of one of the two parts; a second member engageable with a connection component of another of the two parts, the first and second members being slidable relative to each other during the connection of the two parts and having slidable relative to each other surfaces having a predetermined and unchangeable frictional resistance; and means for connecting the first and second members together.
8. A clamp as set forth in claim 7, wherein the respective connection components of the two parts are formed as projections extending in opposite directions, and the first and second members have respective grooves in which the respective connection components engage upon connection of the two parts.
9. A clamp as set forth in claim 7, wherein the first member is formed as a clamp bolt provided at a free end thereof with a thread, and the second member has an opening through which the free end of the clamp bolt is extendable, and wherein the connecting means comprises a nut that is screwed on the thread for connecting the first and second members of the clamp together.
10. A clamp as set forth in claim 7, wherein the slidable relative to each other surfaces of the first and second members are provided with a coating having a predetermined and unchangeable frictional resistance.
11. A clamp as set forth in claim 7, wherein the first and second members are formed of materials surfaces of which have a predetermined and unchangeable frictional resistance.
12. A clamp as set forth in claim 11, wherein the first and second members are formed of different materials the surfaces of which have, in cooperation with each other, a predetermined and unchangeable frictional resistance.
US10/939,055 2003-09-17 2004-09-10 Connection element Abandoned US20050058554A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10342907A DE10342907A1 (en) 2003-09-17 2003-09-17 Vacuum pump with fast rotating rotor
DE10342907.7 2003-09-17

Publications (1)

Publication Number Publication Date
US20050058554A1 true US20050058554A1 (en) 2005-03-17

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ID=34177789

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/939,055 Abandoned US20050058554A1 (en) 2003-09-17 2004-09-10 Connection element

Country Status (4)

Country Link
US (1) US20050058554A1 (en)
EP (1) EP1517045A3 (en)
JP (1) JP4979883B2 (en)
DE (1) DE10342907A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103939694A (en) * 2013-01-18 2014-07-23 普发真空有限公司 Connecting device
US20160348815A1 (en) * 2015-05-26 2016-12-01 MTU Aero Engines AG Clamping device for joining flange pieces
US20180340638A1 (en) * 2017-05-25 2018-11-29 Edwards Vacuum Llc Clamps for fluid conduits
CN109296768A (en) * 2017-07-25 2019-02-01 Smc株式会社 The mounting structure of gate and valve
USD944070S1 (en) * 2020-02-26 2022-02-22 Edwards Vacuum Llc Clamp
US20230012260A1 (en) * 2021-07-09 2023-01-12 Home Depot Product Authority, Llc Ventilation fan installation system

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JP2006144783A (en) * 2004-11-24 2006-06-08 Pfeiffer Vacuum Gmbh Damage preventing device connectable to flange of vacuum pump having high-speed rotor
DE102005020904A1 (en) * 2005-05-07 2006-11-09 Leybold Vacuum Gmbh Vacuum pump assembly
DE102005059636A1 (en) * 2005-12-14 2007-06-21 Pfeiffer Vacuum Gmbh vacuum pump
DE102006058672B4 (en) * 2006-12-13 2016-09-15 Pfeiffer Vacuum Gmbh Arrangement with vacuum pump
EP1939459B1 (en) * 2006-12-27 2018-04-25 Safran Aero Boosters SA System with jaws for connecting two flanges, in particular for a compressor shroud
DE102008028199A1 (en) * 2008-06-12 2009-12-17 Pfeiffer Vacuum Gmbh connecting element
JP5432215B2 (en) * 2011-06-02 2014-03-05 株式会社伊藤製作所 Joint structure
DE102014102680A1 (en) * 2014-02-28 2015-09-03 Pfeiffer Vacuum Gmbh vacuum pump arrangement
DE102014104161A1 (en) * 2014-03-26 2015-10-01 Pfeiffer Vacuum Gmbh Roots
JP6374250B2 (en) * 2014-07-16 2018-08-15 岡山市 Joining reinforcement jig
JP6311653B2 (en) * 2015-06-11 2018-04-18 Ｊｆｅスチール株式会社 Flange joint reinforcement jig

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US2812918A (en) * 1954-04-13 1957-11-12 Hugh A Longino Versatile clip
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US3764170A (en) * 1971-11-23 1973-10-09 Sola Basic Ind Inc Universal wave guide flange
US3771819A (en) * 1971-12-01 1973-11-13 Hydrasearch Co Inc Axially and rotatably movable flange connector
US3876046A (en) * 1973-07-09 1975-04-08 Licentia Gmbh Mounting of an exchangeable adaptor rail on a contact rail
US4003590A (en) * 1973-11-23 1977-01-18 Walter Hefel Fluid-tight flange coupling and method of making the same
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US5435124A (en) * 1994-08-10 1995-07-25 United Technologies Corporation Mounting bracket for an aircraft engine accessory
US6918619B2 (en) * 2002-06-25 2005-07-19 General Electric Company Pipe connecting assembly and method of use

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US1366955A (en) * 1919-08-02 1921-02-01 Schneible Joseph Tubular-section coupling
US1514803A (en) * 1921-02-03 1924-11-11 Souter Dracos Flange pipe coupling
US1473504A (en) * 1922-12-23 1923-11-06 Neely Richard Earl Rail clamp
US1554899A (en) * 1924-06-27 1925-09-22 Daniel P Vick Combined vise and jack
US2682694A (en) * 1951-12-27 1954-07-06 Paul E Kempkes Clamping device
US2812918A (en) * 1954-04-13 1957-11-12 Hugh A Longino Versatile clip
US3458221A (en) * 1965-10-22 1969-07-29 Varian Associates Metal vacuum joint
US3764170A (en) * 1971-11-23 1973-10-09 Sola Basic Ind Inc Universal wave guide flange
US3771819A (en) * 1971-12-01 1973-11-13 Hydrasearch Co Inc Axially and rotatably movable flange connector
US3876046A (en) * 1973-07-09 1975-04-08 Licentia Gmbh Mounting of an exchangeable adaptor rail on a contact rail
US4003590A (en) * 1973-11-23 1977-01-18 Walter Hefel Fluid-tight flange coupling and method of making the same
US4367053A (en) * 1978-11-06 1983-01-04 Andrew Stratienko Clamping device
US5134329A (en) * 1989-01-26 1992-07-28 Siemens Aktiengesellschaft Self-ventilated electrical machine with arrangement to facilitate assembly and dismantling of the ventilator disk
US4901380A (en) * 1989-01-30 1990-02-20 Kohler Ltd./Ltee Knockdown bathing enclosure
US5435124A (en) * 1994-08-10 1995-07-25 United Technologies Corporation Mounting bracket for an aircraft engine accessory
US6918619B2 (en) * 2002-06-25 2005-07-19 General Electric Company Pipe connecting assembly and method of use

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103939694A (en) * 2013-01-18 2014-07-23 普发真空有限公司 Connecting device
US9695967B2 (en) 2013-01-18 2017-07-04 Pfeiffer Vacuum Gmbh Connection apparatus
US20160348815A1 (en) * 2015-05-26 2016-12-01 MTU Aero Engines AG Clamping device for joining flange pieces
US10584816B2 (en) * 2015-05-26 2020-03-10 MTU Aero Engines AG Clamping device for joining flange pieces
US20180340638A1 (en) * 2017-05-25 2018-11-29 Edwards Vacuum Llc Clamps for fluid conduits
CN109296768A (en) * 2017-07-25 2019-02-01 Smc株式会社 The mounting structure of gate and valve
US10539240B2 (en) 2017-07-25 2020-01-21 Smc Corporation Gate-valve attaching structure
USD944070S1 (en) * 2020-02-26 2022-02-22 Edwards Vacuum Llc Clamp
US20230012260A1 (en) * 2021-07-09 2023-01-12 Home Depot Product Authority, Llc Ventilation fan installation system
US11619241B2 (en) * 2021-07-09 2023-04-04 Home Depot Product Authority, Llc Ventilation fan installation system

Also Published As

Publication number Publication date
DE10342907A1 (en) 2005-04-21
EP1517045A3 (en) 2012-03-07
JP2005090505A (en) 2005-04-07
EP1517045A2 (en) 2005-03-23
JP4979883B2 (en) 2012-07-18

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Legal Events

Date Code Title Description
AS Assignment

Owner name: PFEIFFER VACUUM GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FAHRENBACH, PETER;WATZ, ROBERT;REEL/FRAME:015786/0676

Effective date: 20040902

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION