US3392538A - Vacuum pumping unit - Google Patents

Vacuum pumping unit Download PDF

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Publication number
US3392538A
US3392538A US589695A US58969566A US3392538A US 3392538 A US3392538 A US 3392538A US 589695 A US589695 A US 589695A US 58969566 A US58969566 A US 58969566A US 3392538 A US3392538 A US 3392538A
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US
United States
Prior art keywords
block
pump
valve
suction
circuit
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
US589695A
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English (en)
Inventor
Mongodin Guy Emile Victor
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.)
Alcatel Lucent SAS
Original Assignee
Alcatel SA
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 Alcatel SA filed Critical Alcatel SA
Application granted granted Critical
Publication of US3392538A publication Critical patent/US3392538A/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
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F9/00—Diffusion pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
    • F02C3/20—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products
    • F02C3/30—Adding water, steam or other fluids for influencing combustion, e.g. to obtain cleaner exhaust gases

Definitions

  • the present invention relates to a unitary compact block for housing the various elements of a suction pump circuit.
  • suction techniques the traditional design of diffusion pumps,traps, and valves in the form of separate devices with a suction flange and a delivery flange, make it difficult to form a compact assembly of the diffusion pump with the baffles, traps, valves, and other devices necessary to make a complete suction circuit.
  • the object of this invention is to provide complete suction circuits comprising at least one diffusion pump, at least one trap, and at least one valve, all these parts being assembled in an extremely compact and economical manner.
  • a unitary compact block for housing the various elements of a suction pump circuit namely the previously mentioned parts comprises a casing in which cavities for the diffusion pump body and for the body (or bodies) of the trap and valve are machined, the various said cavities being connected by apertures formed in the block and serving as pipes connecting together the different members of the suction circuit.
  • a block may be likewise utilised for detecting leaks.
  • the pumping block thus constituted eliminates numerous joints and connecting flanges which are required in conventional suction pumping circuits and which are sources of gas losses and lealcs.
  • the surface effecting cooling at least in the case of an air cooled pump, may be considerably enlarged, by the use of fins distributed over the greater part of the block.
  • FIGURE 1 shows the theoretical diagram of the pumping circuit to be produced
  • FIGURE 2 illustrates diagrammatically the manner in Patented July 16, 1968
  • FIGURE 3 illustrates diagrammatically an alternative I arrangement in which the pre-exhausting pump is separate from the primary pump;
  • FIGURE 4 illustrates the manner in which the cavities of the different elements are formed in the block.
  • the pumping circuit to be provided comprises a diffusion pump 1, preexhausted by a primary pump 2, a suction valve 3 situated between the suction side of the diffusion pump 1 and a liquid nitrogen trap 4, a suction valve 5 situated between said trap and a suction flange 6, while, on the pipe connecting the valve 5 and the flange 6, there are branched in parallel an air re-entry valve 7 and a by-pass valve 8 enabling the primary pump 2 to be used as a preexhausting pump.
  • This suction circuit constitutes a very conventional assembly in suction technique and has the disadvantages referred to hereinabove.
  • FIGURE 2 a circuit of this type is constructed as illustrated in FIGURE 2.
  • FIGURE 3 illustrates the same suction circuit as in FIGURE 1, but includes a pre-exhausting pump 9 which, by means of the by-pass valve 8, can be connected to or disconnected from the circuit.
  • This arrangement is particularly suitable when the equipment has to 'be used for the detection of leaks.
  • FIGURE 4 shows how it is possible to construct a compact suction pumping unit in accordance with the above description.
  • a preferably forged metal block 10 in which there are made passages and cavities of suitable diameters simply by drilling and boring operations.
  • a cylindrical cavity 20 is provided to receive the diffusion pump 1, a passage 21 constitutes the pipe for connection to the primary pump via the junction 18, and a bore 22 forms the seat for the valve 3 situated in a cavity 23.
  • a passage 25 constitutes the pipe for connecting the valve 3 annd the liquid nitrogen trap 4 situated in a cylindrical cavity 26. Said cavity is connected by a passage 27 to a lateral cavity 28 .for receiving the valve 5, and the peripheral edge 29 of the passage 27 forms the seat of said valve.
  • a bore 30 passing through the cavity 28 constitutes the passage connecting the valve 5 to the suction flange 6, and a passage 31, formed at the bottom of a cavity 32, is provided to receive the valve 7 and leads into said bore.
  • the peripheral edge 33 of the passage 31 forms the seat of said valve.
  • a passage 34 formed radially in relation to a cavity 32 constitutes the passage leading to the air intake 17.
  • a passage 35 formed at the bottom of a cavity 36 is provided for receiving the valve 8 and also leads into the bore 30.
  • the peripheral edge of the passage 35 forms a seat 37 for said valve.
  • a passage 38 formed radially in relation to the cavity 36 constitutes the connecting passage between the bypass valve 8 and the primary pump.
  • the block 10 is provided with fins 10' over all or part of its peripheral surface. These fins facilitate the cooling of the whole arrangement and particularly the cooling of the oil; now, it is known that the temperature to which the oil is cooled determines the limit value of the vacuum which can be obtained.
  • the cooling may be further accelerated and/or increased by placing the block in front of a fan blowing along the larger faces of the block.
  • fins may be milled on the block 10 in order to increase the dissipation of heat therefrom as state-d above.
  • Tightness is more reliable through the reduction of the number of joints, thus resulting in low loss of gas
  • the pump is cooled in the volume of the block instead of cooling being effected by the transmission of heat to a single surface.
  • a large ventilatable surface is available, so that better cooling is effected;
  • the block has great rigidity; vacuum installations are generally made of non-rusting metal, such as steel, because aluminium is fragile in the small dimensions used in coppersmiths work, whereas by making a machined block a rigid and compact part is obtained;
  • valves may be as large as desired
  • the block When the block is used for detecting leaks, the advantage is gained of high resistance to shocks, thus enabling this equipment to be embarked in space vessels, while moreover the very accurate outer surfaces of the block enable useful accessories to be arranged and held therein, even in an overhung arrangement, for example a detector analysis cell.
  • a casing for housing the components of a suction pump circuit including a diffusion pump, at least one trap, and at least one valve comprising a solid unitary block having substantially fiat sides, cavities extending from said sides into said block and thence opening into other of said sides, passages interconnecting said cavities, said diffusion pump, traps and valves being arranged and contained in said cavities whereby said pump circuit is integrated within said solid block.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Compressor (AREA)
US589695A 1965-10-27 1966-10-26 Vacuum pumping unit Expired - Lifetime US3392538A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR36401A FR1464716A (fr) 1965-10-27 1965-10-27 Bloc compact de pompage sous vide

Publications (1)

Publication Number Publication Date
US3392538A true US3392538A (en) 1968-07-16

Family

ID=8591319

Family Applications (1)

Application Number Title Priority Date Filing Date
US589695A Expired - Lifetime US3392538A (en) 1965-10-27 1966-10-26 Vacuum pumping unit

Country Status (9)

Country Link
US (1) US3392538A (en))
BE (1) BE688888A (en))
CH (1) CH468561A (en))
DE (1) DE1503708B1 (en))
ES (1) ES332725A1 (en))
FR (1) FR1464716A (en))
GB (1) GB1137176A (en))
LU (1) LU52255A1 (en))
NL (2) NL6615112A (en))

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4722191A (en) * 1986-09-17 1988-02-02 Pennwalt Corporation High vacuum pumping system
US5169502A (en) * 1988-05-30 1992-12-08 Siemens Aktiengesellschaft Installation for processing liquids
US5259735A (en) * 1991-04-25 1993-11-09 Hitachi, Ltd. Evacuation system and method therefor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2732696A1 (de) * 1977-07-20 1979-02-22 Leybold Heraeus Gmbh & Co Kg Verfahren und vorrichtung zur evakuierung eines rezipienten

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3119243A (en) * 1962-04-04 1964-01-28 Nat Res Corp Vacuum device
US3168819A (en) * 1961-03-06 1965-02-09 Gen Electric Vacuum system
US3252291A (en) * 1963-04-04 1966-05-24 Bendix Balzers Vacuum Inc Cryo-pumps
US3262279A (en) * 1964-10-09 1966-07-26 Little Inc A Extreme high vacuum apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1037636A (fr) * 1950-03-22 1953-09-22 Procédé et dispositif pour faire fonctionner des postes de pompage à vide poussécomportant des pompes à vide primaire et à vide poussé
GB825525A (en) * 1955-12-09 1959-12-16 N G N Electrical Ltd Improvements in or relating to diffusion vacuum pumps

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3168819A (en) * 1961-03-06 1965-02-09 Gen Electric Vacuum system
US3119243A (en) * 1962-04-04 1964-01-28 Nat Res Corp Vacuum device
US3252291A (en) * 1963-04-04 1966-05-24 Bendix Balzers Vacuum Inc Cryo-pumps
US3262279A (en) * 1964-10-09 1966-07-26 Little Inc A Extreme high vacuum apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4722191A (en) * 1986-09-17 1988-02-02 Pennwalt Corporation High vacuum pumping system
US5169502A (en) * 1988-05-30 1992-12-08 Siemens Aktiengesellschaft Installation for processing liquids
US5259735A (en) * 1991-04-25 1993-11-09 Hitachi, Ltd. Evacuation system and method therefor

Also Published As

Publication number Publication date
BE688888A (en)) 1967-03-31
CH468561A (fr) 1969-02-15
NL6615112A (en)) 1967-04-28
LU52255A1 (en)) 1966-12-28
ES332725A1 (es) 1967-11-01
GB1137176A (en) 1968-12-18
NL129514C (en))
FR1464716A (fr) 1967-01-06
DE1503708B1 (de) 1970-11-26

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