US3644702A - Vacuum pump designed as displacement pump - Google Patents

Vacuum pump designed as displacement pump Download PDF

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Publication number
US3644702A
US3644702A US22580A US3644702DA US3644702A US 3644702 A US3644702 A US 3644702A US 22580 A US22580 A US 22580A US 3644702D A US3644702D A US 3644702DA US 3644702 A US3644702 A US 3644702A
Authority
US
United States
Prior art keywords
pump
sealing fluid
vessel
storage vessel
located above
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.)
Expired - Lifetime
Application number
US22580A
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English (en)
Inventor
Marcel Kohler
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.)
Balzers Patent und Beteiligungs AG
Original Assignee
Balzers Patent und Beteiligungs AG
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 Balzers Patent und Beteiligungs AG filed Critical Balzers Patent und Beteiligungs AG
Application granted granted Critical
Publication of US3644702A publication Critical patent/US3644702A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/02—Liquid sealing for high-vacuum pumps or for compressors
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F28/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a bond to sulfur or by a heterocyclic ring containing sulfur
    • 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
    • F04C2220/00—Application
    • F04C2220/50—Pumps with means for introducing gas under pressure for ballasting

Definitions

  • heating means are Provided to heat at least that portion of the wall of the storage vessel located above the level of the sealing fluid therein.
  • the heating means may include a double jacket heated by a through- [52] 11.8. CI ..219/201, 418/85, fills/2959; flowing heating medium or may be an eiectric heatingjacket [51] Intel.
  • a line [58] Field 8/80 97 may be provided to return sealing fluid from the storage vessel I 2118/99 5 into the pump, this line being in heat-conducting relation with that portion of the vessel wall located above the fluid level.
  • This invention relates to vacuum pumps designed as displacement pumps and which draw in, compress and then eject the gas to be delivered, by periodic enlargement and reduction of a workspace defined by solid structural elements, such as pistons, rotors, slides, valves, etc.
  • Such pumps are known to have the disadvantage that, in the removal of the vapors, due to the compression, condensates are formed, and these get into the sealing fluid and thereby greatly reduce the attainable vacuum.
  • German Pat. No. 702,480 discloses an arrangement for preventing the condensation of vapors in a vacuum pump, for producing high vacuums, by introducing a certain quantity of gas, in particular air, at a point of the pump space blocked off from the suction line, and where the quantity of gas admixed with the vapor is proportioned so that the formation of liquid in the pump, due to liquefaction of the vapors drawn off, is either prevented or at least reduced to an innocuous degree.
  • This known so-called gas ballast pump is limited in its ability to pump off vapors in continuous operation. At higher suction pressures of the gases to be pumped off, in fact, it is not sufficiently capable of taking up the ballast gases.
  • the provision of a gas ballast valve which, with a greater flow passage cross section and if arranged at a suitable point in the pump, should bring about the admission of more than the usual quantity of ballast gas, fails due to the fact that, at the high speeds required for rotary displacement pumps to attain suction capacities of great volume, the time span available for the introduction of the ballast gas, during which the ballast gas inlet is in communication with a selected pump chamber, is too short.
  • ballast gas it has also been proposed, to introduce a sufficient quantity of ballast gas, to introduce the latter under increased pressure or at several points, for example, into the compression zone and into the connecting line between two stages of a two-stage pump. All these known measures have resulted in an improvement, but the danger of condensate formation still has not been reliably eliminated in many cases where relatively large quantities of vapor are produced.
  • the objective of the present invention is to improve the ability to remove vapors from vacuum pumps, designed as displacement pumps and which are equipped with known means or other means for preventing condensation of vapors in the interior of the pump, and whose discharge port communicates with a storage vessel provided with an outlet aperture for the pumped gases and containing a supply of sealing fluid covering the discharge valve of the pump.
  • a storage vessel provided with an outlet aperture for the pumped gases and containing a supply of sealing fluid covering the discharge valve of the pump.
  • at least that portion of the storage vessel wall located above the level of the sealing fluid therein is heatable.
  • the effect of the solution proposed by the invention may be understood from the following. It has been surprising to note that the contamination of the sealing fluid with vapor condensates does not arise primarily from the fact that the condensation of the vapors in the pump chambers cannot be suppressed with known means. What has been overlooked, up to the present time, is that the vapors delivered by the pump, after passing through the sealing fluid supply above the discharge valve, can condense at those portions of the inner wall of the storage vessel not covered by the hot sealing fluid, because these wall portions usually have too low a temperature. The condensate formed at these wall portions drips or trickles from the wall, and thus enters into the sealing fluid, becomes mixed with the latter and thereby returns into the pump. By heating these wall portions, condensation is prevented in a known manner, and it is thereby assured that the gas-vapor mixture delivered by the pump leaves the vessel through the outlet aperturewithout being able to do any damage.
  • An object of the invention is to provide an improved vacuum pump designed as a displacement pump.
  • An other object of the invention is to provide such a vacuum pump including improved means for preventing the formation of condensate when the pump is used to pump vapor-containing gases.
  • a further object of the invention is to provide such a pump including a storage vessel communicating with the discharge port of the pump and containing a sealing fluid for a discharge valve, and in which at least those portions of the walls of the storage vessel above the level of the sealing fluid therein are heated.
  • FIGURE is a substantially diametric sectional view through a vacuum pump embodying the invention.
  • a rotary vane type vacuum pump is illustrated as including a housing 1 in which is rotatably and eccentrically mounted a rotor 2 formed with radial slots receiving radially displaceable vanes 3.
  • Springs 4 bias vanes 3 against the inner wall or surface of the pump housing, and divide the housing into several pump chambers.
  • the vapor-containing gas to be pumped is drawn in through an inlet line 5,
  • the rotary vane pump as so far described, is an ordinary vacuum pump.
  • means are provided for heating the wall portion 9 of vessel 7 located above the sealing fluid, wall portion 9' in the illustrated example being designed as ajacket 10 which is traversed by a heating medium. It is especially expedient to use the hot sealing fluid itself as a heating medium, and to return it through the heating jacket to the discharge space of the pump through line 11, as illustrated in the drawing.
  • an electrical heating jacket 12 surrounding at least the upper portion of storage vessel 7 may be provided.
  • an electrical heating jacket 12 surrounding at least the upper portion of storage vessel 7.
  • a vacuum pump designed as a displacement pump for drawing off vapor-containing gases and including a pump housing wall having a discharge port communicating with a walled storage vessel having an outlet aperture for the pumped gases and containing a supply of sealing fluid partly filling said vessel and covering a discharge valve in the discharge port, the improvement comprising heating means operable to heat at least that portion of the vessel wall located above the level of the sealing fluid in said vessel.
  • the improvement claimed in claim 1 including a line for the return of sealing fluid from said storage vessel into said pump, said line being connected, for heat conduction, with that portion of the storage vessel wall located above thesealing fluid level therein.
  • a vacuum pump designed as a displacement pump for drawing off vapor-containing gases and including a pump housing wall having a discharge port communicating with a walled storage vessel having an outlet aperture for the pumped gases and containing a supply of sealing fluid covering a discharge valve in the discharge port, the improvement comprising heating means operable to heat at least that portion of the vessel wall located above the level of the sealing fluid in said vessel; that portion of the vessel wall located above the sealing fluid level being formed as a double jacket heatable by a through-flowing heating medium.
  • a vacuum pump designed as a displacement pump for drawing off vapor-containing gases and including a pump housing wall having a discharge port communicating with a walled storage vessel having an outlet aperture for the pumped gases and containing a supply of sealing fluid covering a discharge valve in the discharge port, the improvement comprising heating means operable to heat at least that portion of the vessel wall located above the level of the sealing fluid in said vessel; said heating means including electric heating means surrounding at least that portion of the vessel wall located above the sealing fluid level.
  • said electric heating means is an electric heating jacket.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
US22580A 1969-03-31 1970-03-27 Vacuum pump designed as displacement pump Expired - Lifetime US3644702A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691916394 DE1916394A1 (de) 1969-03-31 1969-03-31 Als Verdraengerpumpe ausgebildete Vakuumpumpe

Publications (1)

Publication Number Publication Date
US3644702A true US3644702A (en) 1972-02-22

Family

ID=5729864

Family Applications (1)

Application Number Title Priority Date Filing Date
US22580A Expired - Lifetime US3644702A (en) 1969-03-31 1970-03-27 Vacuum pump designed as displacement pump

Country Status (6)

Country Link
US (1) US3644702A (nl)
CH (1) CH482118A (nl)
DE (1) DE1916394A1 (nl)
FR (1) FR2040010A5 (nl)
GB (1) GB1274787A (nl)
NL (1) NL138809B (nl)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5369982A (en) * 1990-11-26 1994-12-06 Leybold Aktiengesellschaft Leak detector
US6454127B1 (en) 2000-08-17 2002-09-24 Sheree Suomela Self-contained liquid dispenser with heating means
US20080166247A1 (en) * 2005-02-26 2008-07-10 Michael Holzemer Single-Shaft Vacuum Positive Displacement Pump
US20090074591A1 (en) * 2007-09-17 2009-03-19 Courier John P High pressure radial pump

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19852092B4 (de) * 1998-11-12 2014-01-02 Eichenauer Heizelemente Gmbh & Co. Kg Wasserpumpe für Wasch- und Spülmaschinen mit integrierter Wassererwärmung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5369982A (en) * 1990-11-26 1994-12-06 Leybold Aktiengesellschaft Leak detector
US6454127B1 (en) 2000-08-17 2002-09-24 Sheree Suomela Self-contained liquid dispenser with heating means
US20080166247A1 (en) * 2005-02-26 2008-07-10 Michael Holzemer Single-Shaft Vacuum Positive Displacement Pump
US20090074591A1 (en) * 2007-09-17 2009-03-19 Courier John P High pressure radial pump
US8011898B2 (en) * 2007-09-17 2011-09-06 John P. Courier High pressure radial pump

Also Published As

Publication number Publication date
FR2040010A5 (nl) 1971-01-15
DE1916394A1 (de) 1970-10-15
NL6908043A (nl) 1970-10-02
CH482118A (de) 1969-11-30
DE1916394B2 (nl) 1975-04-03
GB1274787A (en) 1972-05-17
NL138809B (nl) 1973-05-15

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