US3458120A - Oil sealing of rotary piston vacuum pump - Google Patents

Oil sealing of rotary piston vacuum pump Download PDF

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Publication number
US3458120A
US3458120A US673359A US3458120DA US3458120A US 3458120 A US3458120 A US 3458120A US 673359 A US673359 A US 673359A US 3458120D A US3458120D A US 3458120DA US 3458120 A US3458120 A US 3458120A
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US
United States
Prior art keywords
piston
vacuum pump
oil
housing
rotary piston
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
US673359A
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English (en)
Inventor
Hansen Pfaff
Hartmut Sinn
Maximilian Wutz
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.)
Leybold Heraeus Verwaltung GmbH
Original Assignee
Leybold Heraeus Verwaltung 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
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Publication of US3458120A publication Critical patent/US3458120A/en
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Expired - Lifetime legal-status Critical Current

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    • 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/22—Rotary-piston pumps specially adapted for elastic fluids of internal-axis type with equidirectional movement of co-operating members at the points of engagement, or with one of the co-operating members being stationary, the inner member having more teeth or tooth equivalents than the outer member
    • 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
    • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
    • 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members

Definitions

  • the present invention concerns an oil sealed rotary piston vacuum pump having a piston of hypotrochoidal form rotating eccentrically within a housing forming a corresponding outer cover. :In such a pump the piston contacts at least one point of the housing during its rotation.
  • Rotary piston machines may be used as pumps, but from the very many usable forms of machine, only specific ones can be used to obtain a very high or medium degree of vacuum -10 torr). It has been found that machines having hypotrochoidal form rotary pistons and a tranmission ratio of 1:2 or 2:3 are useful. In these machines the space to be evacuated starts with zero volume and dead spaces do not occur.
  • the runner or piston has two or three corners. In such machines, there is at one or two points, in a fixed part of the pump which forms a mantle, a predetermined location forming a point or corner. These points separate the suction and the pressure side and the rotary bodies fit against them in any phase of motion.
  • the pressure port in accordance with the present invention, to form the pressure port so that it is contiguous with a contact line, formed in the housing of the vacuum pump, for continuous engagement by the piston as it rotates.
  • the pressure port may be slightly enlarged.
  • a radially resilient sealing strip is provided at the contact line and this may be suitably recessed to correspond in shape to the enlargement of the pressure port.
  • FIG. 1 is a cross-section through one embodiment of pump housing and hypotrochoidal form piston constructed in accordance with the invention
  • FIG. 2 is a similar cross-section in which the piston is in a different position
  • FIG. 3 is a similar cross-section but of a second embodiment of the invention.
  • FIG. 4 is a cross-section of the embodiment shown in FIG. 3 in which the piston is in a different position.
  • the transmission ratio is 1:2.
  • a piston 12 rotates in a pump housing 10 in the direction of the arrow, the drive for the piston being by means of an eccentric drive (not shown).
  • the piston 12 rolls on an inner gearing 16 meshing with a pinion 14 fixed to the housing 10.
  • the piston 12 runs against a point 18 of the housing 10 which point is located between a suction port 20 and a pressure port 22.
  • the pump is employed as a vacuum pump, it is usually used with oil for sealing. 'If the piston 12 reaches the FIGURE 2. position, then almost maximum pressure differential is reached. If the piston 12 moves slightly further, the pressure port 22 is practically closed 01f by the piston 12.
  • the sealing oil which is carried along is pushed ahead by the piston 12 as a small oil lake and collects in front of the point 18 and could in the ordinary construction, as the piston rotates, not escape into the pressure port 22.
  • the oil could be pushed beyond the edge 18 and, in view of the high oil speed, be pushed into the suction port 20* where it could de-gas itself. This, however, is avoided by forming a small rabbet 24 in the pressure port 22 near the point 18.
  • the sealing oil can now enter into the thus enlarged port 22 through the rabbet 24 and can escape therefrom even under maximum pressure dilferential.
  • a groove or recess 26 is formed at the point 18 in the housing 10.
  • a sealing strip 28 is placed into the recess 26 and is radially resiliently held there. During the running of the piston, the strip 28 compensates for tolerances in manufacture and for vibrations of the piston during operation.
  • the sealing strip 28 is provided with an increased chamber 30 which connects with the pressure port 22.
  • the increased chamber 30 can be made easily by milling out a portion of the sealing strip 28.
  • the pressure port 22 is thus extended to the region of the point 18, and perfect operation with good efliciency is obtained.
  • An oil sealed rotary piston vacuum pump having a housing, an eccentrically rotatable hypotrochoidal piston located in the housing, said housing having the form of the appropriate enveloping figure therefor, and having a contact line continuously engaged by said piston as it rotates, a pressure port being formed in said housing, said 3,458,120 3 4 pressure port extending Within said pump housing up to References Cited said contact line of the enveloping figure.
  • UNITED STATES PATENTS 2 Pump accordlng to claim 1 includmg a recess in the pressure port formed adjacent said contact line. 3,289,646 12/1966 Paras- 3.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
US673359A 1966-10-07 1967-10-06 Oil sealing of rotary piston vacuum pump Expired - Lifetime US3458120A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH0060679 1966-10-07

Publications (1)

Publication Number Publication Date
US3458120A true US3458120A (en) 1969-07-29

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ID=7161077

Family Applications (1)

Application Number Title Priority Date Filing Date
US673359A Expired - Lifetime US3458120A (en) 1966-10-07 1967-10-06 Oil sealing of rotary piston vacuum pump

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US (1) US3458120A (enrdf_load_html_response)
CH (1) CH452777A (enrdf_load_html_response)
NL (1) NL6711186A (enrdf_load_html_response)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3533716A (en) * 1968-05-02 1970-10-13 Leybold Heraeus Verwaltung Pump seal
US4296500A (en) * 1977-05-06 1981-10-27 Agence Nationale De Valorisation De La Recherche (Anvar) Artifical heart
RU2486369C1 (ru) * 2012-01-17 2013-06-27 Сергей Алексеевич Уфимцев Вакуумнасос-компрессор
US20150030492A1 (en) * 2013-06-05 2015-01-29 Montie Power Corporation Rotary Machine
US10837444B2 (en) 2018-09-11 2020-11-17 Rotoliptic Technologies Incorporated Helical trochoidal rotary machines with offset
US11802558B2 (en) 2020-12-30 2023-10-31 Rotoliptic Technologies Incorporated Axial load in helical trochoidal rotary machines
US11815094B2 (en) 2020-03-10 2023-11-14 Rotoliptic Technologies Incorporated Fixed-eccentricity helical trochoidal rotary machines
US12146492B2 (en) 2021-01-08 2024-11-19 Rotoliptic Technologies Incorporated Helical trochoidal rotary machines with improved solids handling
US12352268B2 (en) 2021-01-08 2025-07-08 Rotoliptic Technologies Incorporated Pumps, compressors, and expanders with a teardrop-shaped rotor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3289646A (en) * 1963-08-14 1966-12-06 Renault Cylinder-heads for rotary engines
US3303830A (en) * 1966-04-22 1967-02-14 American Motors Corp Rotor for rotary combustion engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3289646A (en) * 1963-08-14 1966-12-06 Renault Cylinder-heads for rotary engines
US3303830A (en) * 1966-04-22 1967-02-14 American Motors Corp Rotor for rotary combustion engine

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3533716A (en) * 1968-05-02 1970-10-13 Leybold Heraeus Verwaltung Pump seal
US4296500A (en) * 1977-05-06 1981-10-27 Agence Nationale De Valorisation De La Recherche (Anvar) Artifical heart
RU2486369C1 (ru) * 2012-01-17 2013-06-27 Сергей Алексеевич Уфимцев Вакуумнасос-компрессор
US10844720B2 (en) 2013-06-05 2020-11-24 Rotoliptic Technologies Incorporated Rotary machine with pressure relief mechanism
US20150030492A1 (en) * 2013-06-05 2015-01-29 Montie Power Corporation Rotary Machine
US10087758B2 (en) * 2013-06-05 2018-10-02 Rotoliptic Technologies Incorporated Rotary machine
US11506056B2 (en) 2013-06-05 2022-11-22 Rotoliptic Technologies Incorporated Rotary machine
US11306720B2 (en) 2018-09-11 2022-04-19 Rotoliptic Technologies Incorporated Helical trochoidal rotary machines
US10844859B2 (en) 2018-09-11 2020-11-24 Rotoliptic Technologies Incorporated Sealing in helical trochoidal rotary machines
US11499550B2 (en) 2018-09-11 2022-11-15 Rotoliptic Technologies Incorporated Sealing in helical trochoidal rotary machines
US10837444B2 (en) 2018-09-11 2020-11-17 Rotoliptic Technologies Incorporated Helical trochoidal rotary machines with offset
US11608827B2 (en) 2018-09-11 2023-03-21 Rotoliptic Technologies Incorporated Helical trochoidal rotary machines with offset
US11988208B2 (en) 2018-09-11 2024-05-21 Rotoliptic Technologies Incorporated Sealing in helical trochoidal rotary machines
US11815094B2 (en) 2020-03-10 2023-11-14 Rotoliptic Technologies Incorporated Fixed-eccentricity helical trochoidal rotary machines
US11802558B2 (en) 2020-12-30 2023-10-31 Rotoliptic Technologies Incorporated Axial load in helical trochoidal rotary machines
US12146492B2 (en) 2021-01-08 2024-11-19 Rotoliptic Technologies Incorporated Helical trochoidal rotary machines with improved solids handling
US12352268B2 (en) 2021-01-08 2025-07-08 Rotoliptic Technologies Incorporated Pumps, compressors, and expanders with a teardrop-shaped rotor

Also Published As

Publication number Publication date
CH452777A (de) 1968-03-15
NL6711186A (enrdf_load_html_response) 1968-04-08

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