US3433297A - Selectively cooled motive fluid trap for a vacuum steam pump - Google Patents

Selectively cooled motive fluid trap for a vacuum steam pump Download PDF

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Publication number
US3433297A
US3433297A US661903A US3433297DA US3433297A US 3433297 A US3433297 A US 3433297A US 661903 A US661903 A US 661903A US 3433297D A US3433297D A US 3433297DA US 3433297 A US3433297 A US 3433297A
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US
United States
Prior art keywords
trap
motive fluid
shield
pump
vacuum steam
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
US661903A
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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
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Balzers Patent und Beteiligungs AG
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Filing date
Publication date
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
    • F04B37/06—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for evacuating by thermal means
    • F04B37/08—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for evacuating by thermal means by condensing or freezing, e.g. cryogenic pumps
    • 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
    • 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
    • F04F9/06—Arrangement of vapour traps

Definitions

  • a motive fluid trap for a vacuum steam pump formed by a trap housing mounted on the steam pump. Means are disposed within the trap housing for condensing the motive or fluid vapor including a support block secured to the trap housing.
  • a nozzle cap for a nozzle, located in the upper part of the pump, is positioned just below the support block.
  • a shield for the nozzle cap is dependently secured to a thermally responsive support element mounted on the block whereby the shield is movably positionable with respect to the nozzle cap in relation to the temperature to which the thermally responsive support element is exposed within the trap housing.
  • the prior art is directed to a motive fluid trap for vacuum steam pumps and, more particularly, to a motive fluid trap which employs different coolants adapted to operate at different temperatures.
  • the ability to cool a motive fluid trap in a vacuum steam pump to different temperatures would be particularly useful in adapting the pump to various operating conditions.
  • different coolants capable of operating at different temperatures are employed.
  • a stronger motive fluid return flow is permissible, or if the pump is separated from its receiver during operation, as by a plate valve, then using water as the coolant is appropriate.
  • the motive fluid vapor pressure in the receiver is to be kept as low as possible to obtain an optimum high vacuum then cooling with liquid nitrogen is preferable.
  • a coolant is employed which would tend to solidify or freeze the motive fluid within the trap, it is important to limit the amount of freezing as much as possible, because the operation of the pump would be disturbed by any considerable loss of motive fluid due to freezing.
  • German provisional Pat. No. 1,071,890 For another trap employed to cool steam to a low temperature by condensing vapors in a vacuum system, see German provisional Pat. No. 1,071,890.
  • the vapor discharged into the coolant vessel or trap evaporates toward the exterior or surface of the trap and in so doing, it cools the separating surfaces within the connecting line between the vacuum receiver and the motive fluid pump. Accordingly, the separation surfaces are at a temperature whereby the condensable vapors are separated out in the liquid state, and a passage of the condensed fluid is provided from the coolant vessel whereby the condensed fluid serves to cool other separation surfaces whose temperature is above that of the coolant fluid.
  • the present invention is directed to a motive fluid trap for a vacuum steam pump wherein the steam is condensed by selectively cooling it with coolants of different operating temperatures.
  • a shield is provided over the nozzle of the pump, and the shield is arranged so that it can be movably positioned in relationship to the nozzle cap for assuring the proper operating conditions for the vacuum steam pump.
  • thermoly responsive support member in a motive fluid trap for a vacuum steam pump which will respond to the temperature within the trap to properly position and support a shield member in relationship to a nozzle cap in the vacuum steam pump itself.
  • Another object of the invention is to utilize a bimetallic element as the thermally responsive support element for the shield in a motive fluid trap selectively cooled by coolants of different temperatures.
  • Yet another object of the present invention is to provide a combined motive fluid trap and vacuum steam pump which permits selective cooling of the motive fluid within the trap while maintaining the optimum efficiency of the pump regardless of the coolant temperature employed.
  • the present invention is directed to a motive fluid trap wherein different coolants operating at different temperatures can be circulated to condense the vaporized motive fluid employed in a vacuum steam pump.
  • the trap is positioned above the uppermost nozzle of the vacuum steam pump and a cap separates the nozzle and the trap.
  • the trap is comprised of a support assembly which includes a thermally responsive support element and a shield dependably supported from the support element and movably positionable in relationship to the nozzle cap. In response to the temperature within the trap the support element either expands or contracts and accordingly positions the shield which is secured to it.
  • the support assembly for the shield must be adapt ed to the different coolants which are used in the trap whereby the shield supported from the element will assume a position relative to the trap such that the temperature of the shield is within permissible limits for reliable operation of the pump.
  • a coolant such as water at 15 C.
  • the heat transmission from the trap to the shield which is determined by the amount of radiation and heat conduction from the nozzle, must be better than exists where a lower temperature coolant, such as liquid nitrogen, is utilized.
  • One successful embodiment of the invention consists in a construction wherein a thermally responsive support element arranged within the trap permits the shield to touch the nozzle cap when a higher temperature coolant is employed but which causes the shield to be spaced from the nozzle cap when the arrangement is being cooled by a lower temperature coolant, such as a liquid gas.
  • the drawing discloses a vertical sectional view of a coolant trap and a portion of a vacuum steam pump embodying the present invention.
  • a vacuum steam pump is shown formed by a housing 1 with a flange 2 disposed at its upper end. Secured to the flange 2 is another flange 3 forming part of a motive fluid trap 4 which extends vertically upward above the housing 1 of the vacuum steam pump.
  • a plurality of right angle collection plates are disposed in vertically spaced arrangement supported by a number of struts from a support block 11 which is supported on the housing 4.
  • the collection plates 59 are cooled by circulating a coolant through tubes 13 secured to the plates. In this arrangement the coolant flowing through the tubes 13 cools the collection plates, which, in turn, condense the steam vapor as it passes over them but permits the gas mixed with the vapor to escape from the space 12.
  • uprights 14 and 15 support a horizontally arranged thermally responsive bimetallic element 16.
  • the block also contains a centrally arranged bore or opening 17 through which extends a support rod 18 attached at its lower end to a shield and at its upper end to the bimetallic element 16.
  • the shield 20 is positioned above the nozzle cap 19:: located on the nozzle 19 of the vacuum steam pump. The position of the shield relative to the nozzle cap is determined by the position assumed by the thermally responsive sup- 'port element 16 within the motive fluid trap.
  • the thermally responsive support element 16 will contract and will assume a flat or horizontal position, and as the temperature within the trap increases, the support element 16 will tend to expand and with the uprights 14 and 15 set relatively stationary, the support element 16 will tend to curve downwardly with its center, to which the rod 18 is secured, assuming the lowermost position. Since the shield is secured to the rod 18, the position of the shield will depend on the position assumed by the support element. When the higher temperature coolant is used, the shield will be in its lower position supported directly on the nozzle cap 19a and as the temperature of the coolant decreases, the shield Will lift off the cap to a position spaced some distance from it depending upon the operating conditions desired for the pump.
  • thermally responsive support element While one specific embodiment of a thermally responsive support element has been shown in the drawing, based on the principle described herein, it will be appreciated that a number of different support elements may be employed which are sensitive to temperature variations within the trap and which will provide the proper orientation of the shield relative to the nozzle cap of the pump, based on the temperature within the trap. The arrangement employed will depend on the operating conditions of the pump and must be capable of providing reliable and efficient operation.
  • a motive fluid trap for a vacuum steam pump whereing different coolants operating at different temperatures can be circulated to condense the vaporized motive fluid, comprising a vacuum steam pump nozzle, a cap positioned on said nozzle, a trap member dis-posed above said nozzle comprising a support assembly including a thermally responsive support element, a shield located below said support assembly and disposed above and movably positionable in relationship to said nozzle cap, said shield dependently secured to said thermally responsive support element whereby as the support element expands and contracts in response to the temperature Within said trap member the shield supported from the thermally responsive support element will move toward and away from the nozzle cap respectively.
  • thermoly responsive support element comprises a bimetallic element.
  • a motive fluid trap as set forth in claim 3 wherein a plurality of annular collection plates are positioned in said trap member and are supported theerin by said block member, and conduit means located within said trap member for circulating coolant fluid therethrough for cooling the surfaces of said collection plates.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
US661903A 1966-08-23 1967-08-21 Selectively cooled motive fluid trap for a vacuum steam pump Expired - Lifetime US3433297A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1225166A CH437616A (de) 1966-08-23 1966-08-23 Wahlweise mit Kühlmitteln verschiedener Temperatur kühlbarer Treibmittelfänger für Vakuumdampfpumpen

Publications (1)

Publication Number Publication Date
US3433297A true US3433297A (en) 1969-03-18

Family

ID=4381286

Family Applications (1)

Application Number Title Priority Date Filing Date
US661903A Expired - Lifetime US3433297A (en) 1966-08-23 1967-08-21 Selectively cooled motive fluid trap for a vacuum steam pump

Country Status (5)

Country Link
US (1) US3433297A (de)
CH (1) CH437616A (de)
DE (1) DE1628431A1 (de)
GB (1) GB1124410A (de)
NL (1) NL6614810A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4207746A (en) * 1979-02-13 1980-06-17 United Technologies Corporation Cryopump
US4356701A (en) * 1981-05-22 1982-11-02 Helix Technology Corporation Cryopump
US4454722A (en) * 1981-05-22 1984-06-19 Helix Technology Corporation Cryopump
US4555907A (en) * 1984-05-18 1985-12-03 Helix Technology Corporation Cryopump with improved second stage array

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2907055A1 (de) * 1979-02-23 1980-08-28 Kernforschungsanlage Juelich Waermestrahlungsschild fuer kryopumpen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1323813A (en) * 1919-12-02 baruch
US1461726A (en) * 1921-04-15 1923-07-17 Harold L Crafts Automobile radiator condenser
US3175373A (en) * 1963-12-13 1965-03-30 Aero Vac Corp Combination trap and baffle for high vacuum systems

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1323813A (en) * 1919-12-02 baruch
US1461726A (en) * 1921-04-15 1923-07-17 Harold L Crafts Automobile radiator condenser
US3175373A (en) * 1963-12-13 1965-03-30 Aero Vac Corp Combination trap and baffle for high vacuum systems

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4207746A (en) * 1979-02-13 1980-06-17 United Technologies Corporation Cryopump
US4356701A (en) * 1981-05-22 1982-11-02 Helix Technology Corporation Cryopump
WO1982003993A1 (en) * 1981-05-22 1982-11-25 Tech Corp Helix Improved cryopump
US4454722A (en) * 1981-05-22 1984-06-19 Helix Technology Corporation Cryopump
US4555907A (en) * 1984-05-18 1985-12-03 Helix Technology Corporation Cryopump with improved second stage array

Also Published As

Publication number Publication date
NL6614810A (de) 1968-02-26
CH437616A (de) 1967-06-15
GB1124410A (en) 1968-08-21
DE1628431A1 (de) 1971-11-18

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