EP0138793B1 - A gas pumping device - Google Patents

A gas pumping device Download PDF

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Publication number
EP0138793B1
EP0138793B1 EP19840850285 EP84850285A EP0138793B1 EP 0138793 B1 EP0138793 B1 EP 0138793B1 EP 19840850285 EP19840850285 EP 19840850285 EP 84850285 A EP84850285 A EP 84850285A EP 0138793 B1 EP0138793 B1 EP 0138793B1
Authority
EP
European Patent Office
Prior art keywords
gas
transport channel
reservoir
gas transport
pumping device
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
Application number
EP19840850285
Other languages
German (de)
French (fr)
Other versions
EP0138793A1 (en
Inventor
Albin Viertler
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.)
Atlas Copco AB
Original Assignee
Atlas Copco AB
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 Atlas Copco AB filed Critical Atlas Copco AB
Publication of EP0138793A1 publication Critical patent/EP0138793A1/en
Application granted granted Critical
Publication of EP0138793B1 publication Critical patent/EP0138793B1/en
Expired 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/102—Shaft sealings especially adapted for elastic fluid pumps

Definitions

  • the present invention relates to a gas pumping device to be used in industrial processes.
  • a gas pumping device to be used in industrial processes.
  • One example of such a process is the compression of vapor in heat exchanging devices used to heat or cool a fluid.
  • the object of the present invention is to create a gas pumping device which in a simple and efficient way guarantees that no air or oil enters into the process gas while maintaining design flexibility for the drive system and easy access to different parts for maintenance. This is obtained with a pumping device as defined in the appended claims.
  • Fig. 1 shows a section of a pumping device according to the invention.
  • Fig. 2 shows an alternative to the embodiment according to Fig. 1.
  • Fig. 3 shows an alternative mounting of the gas pumping device.
  • Fig. 14 shows an end view of a detail of the different embodiments.
  • the embodiment shown in Fig. 1 comprises a lower casing 18 mounted on a frame 33.
  • Casing 18 incorporates an inlet opening 10, an outlet opening 11 and a gas transport channel 12 between the inlet and outlet openings.
  • the lower casing furthermore comprises a volute or collection chamber 19 in communication with the outlet opening and a discharge 20.
  • the lower casing is at the upper end covered by an upper casing 21 and a bearing and sealing part 15 which surrounds the vertical axle 14.
  • Axle 14 is connected with a pumping element 13 which is positioned in the gas transport channel 12.
  • Axle 14 is furthermore connected with driving motor 32 through. a coupling and vibration damping means 31.
  • a reservoir 16 is positioned at the lower end of upper casing 21. This reservoir contains a liquid phase of the.
  • bearing and sealing parts have been shown as one unit. It is possible to separate these functions in the unit 15 or to use two different parts within the scope of the invention. It is essential that the lubricant, normally water, is in a liquid state, whereas the sealing fluid may be in a liquid and/or gas state.
  • Bearing 15 is preferably divided into two parts 37, 38 as shown in Fig. 4. This simplifies maintenance because the bearing can be taken out for inspection and possibly replacement through a service opening 22 without demounting of the whole device. The service opening is during operation covered by a cover 23.
  • the medium is supplied through a conduit 25 and a cooling coil 26 to a conduit 17 which in the embodiment of Fig. 1 feeds bearing 15 with lubricant. Part of the fluid then flows back to the gas transport channel 12. The rest enters reservoir 16.
  • the liquid level in reservoir 16 is kept constant because excess medium is returned to the process through conduit 24.
  • bearing 15 is supplied with lubricant under pressure. This is necessary when the pressure in channel 12 is comparatively high. If the pressure is below atmospheric this is not necessary. In such a case lubricant is supplied as shown in Figs. 2 and 3.
  • the pressure in reservoir 16 is atmospheric.
  • the device is provided with an oil sump 42.
  • the oil is cooled by the cooling coil 26.
  • the oil is used for lubrication of radial bearing 28 and axial bearing 29.
  • the oil is pumped to compartment 43 in a not shown way.
  • the oil level in compartment 43 is maintained constant by overflow conduit 30.
  • Bearings 28, 29 are mounted in wall 27.
  • the embodiment according to Fig. 2 differs from the embodiment of Fig. 1 in that bearing 15 is supplied with lubricant and sealing fluid by means of the prevailing pressure levels. A part of the pumped gas is supplied from the discharge 20 to a conduit 34. A condensor 35 and a pump 36 are positioned in conduit 34 to feed liquid phase medium to reservoir 16.
  • the embodiment shown in Fig. 3 differs from the other embodiments in that the gas pumping device is mounted directly on a heat exchanger 41.
  • the lower casing 39 is provided with a volute 40 which discharges directly into the heat exchanger as shown by arrows.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

  • The present invention relates to a gas pumping device to be used in industrial processes. One example of such a process is the compression of vapor in heat exchanging devices used to heat or cool a fluid.
  • One major problem in a gas pumping device of the above mentioned kind is that air may enter and mix with the gas being pumped. One prior art solution which avoids this problem is shown in DE-A-2315093. This solution uses complete encapsulation of the pumping device and its driving motor. In this way no movable parts extend through the encapsulation and the sealing becomes simple. However, there are certain drawbacks because the build-up is inflexible. If, for instance, there is a desire to change the speed of the pumping device a gear box might be necessary. In such a case the whole casing would ' have to be redesigned.
  • Another prior art solution is disclosed in US-A-4311004. In this solution a seal gas is introduced into a slot around the axle to prevent lubricant from reaching the pumped medium. This solution has the drawback that special means must be provided for separation of the seal gas from the lubricant and/or the pumped medium.
  • The object of the present invention is to create a gas pumping device which in a simple and efficient way guarantees that no air or oil enters into the process gas while maintaining design flexibility for the drive system and easy access to different parts for maintenance. This is obtained with a pumping device as defined in the appended claims.
  • Some embodiments of the invention are described below with reference to the accompanying drawings in which Fig. 1 shows a section of a pumping device according to the invention. Fig. 2 shows an alternative to the embodiment according to Fig. 1. Fig. 3 shows an alternative mounting of the gas pumping device. Fig. 14 shows an end view of a detail of the different embodiments.
  • In the different embodiments the same reference numerals have been used to indicate corresponding parts.
  • The embodiment shown in Fig. 1 comprises a lower casing 18 mounted on a frame 33. Casing 18 incorporates an inlet opening 10, an outlet opening 11 and a gas transport channel 12 between the inlet and outlet openings. The lower casing furthermore comprises a volute or collection chamber 19 in communication with the outlet opening and a discharge 20. The lower casing is at the upper end covered by an upper casing 21 and a bearing and sealing part 15 which surrounds the vertical axle 14. Axle 14 is connected with a pumping element 13 which is positioned in the gas transport channel 12. Axle 14 is furthermore connected with driving motor 32 through. a coupling and vibration damping means 31. A reservoir 16 is positioned at the lower end of upper casing 21. This reservoir contains a liquid phase of the. medium being pumped by pumping element 13. This medium is used as lubricant in the bearing part 15 and also as sealing fluid in the sealing part 15. In the shown embodiments the bearing and sealing parts have been shown as one unit. It is possible to separate these functions in the unit 15 or to use two different parts within the scope of the invention. It is essential that the lubricant, normally water, is in a liquid state, whereas the sealing fluid may be in a liquid and/or gas state. Bearing 15 is preferably divided into two parts 37, 38 as shown in Fig. 4. This simplifies maintenance because the bearing can be taken out for inspection and possibly replacement through a service opening 22 without demounting of the whole device. The service opening is during operation covered by a cover 23. The medium is supplied through a conduit 25 and a cooling coil 26 to a conduit 17 which in the embodiment of Fig. 1 feeds bearing 15 with lubricant. Part of the fluid then flows back to the gas transport channel 12. The rest enters reservoir 16. The liquid level in reservoir 16 is kept constant because excess medium is returned to the process through conduit 24. In the embodiment according to Fig. 1 bearing 15 is supplied with lubricant under pressure. This is necessary when the pressure in channel 12 is comparatively high. If the pressure is below atmospheric this is not necessary. In such a case lubricant is supplied as shown in Figs. 2 and 3. The pressure in reservoir 16 is atmospheric. The device is provided with an oil sump 42. The oil is cooled by the cooling coil 26. The oil is used for lubrication of radial bearing 28 and axial bearing 29. The oil is pumped to compartment 43 in a not shown way. The oil level in compartment 43 is maintained constant by overflow conduit 30. Bearings 28, 29 are mounted in wall 27.
  • The embodiment according to Fig. 2 differs from the embodiment of Fig. 1 in that bearing 15 is supplied with lubricant and sealing fluid by means of the prevailing pressure levels. A part of the pumped gas is supplied from the discharge 20 to a conduit 34. A condensor 35 and a pump 36 are positioned in conduit 34 to feed liquid phase medium to reservoir 16.
  • The embodiment shown in Fig. 3 differs from the other embodiments in that the gas pumping device is mounted directly on a heat exchanger 41. The lower casing 39 is provided with a volute 40 which discharges directly into the heat exchanger as shown by arrows.

Claims (3)

1. A gas pumping device comprising an inlet opening (10) and an outlet opening (11), said openings being connected through a gas transport channel (12) which is sealed off from the surrounding atmosphere, a pumping element (13) driven by a vertical shaft (14) and being situated in said gas transport channel to pump gas from said inlet opening to said outlet opening, characterized by a conduit (17) or a reservoir (16) for supplying a liquid phase of the pumped medium as a lubricant to a bearing part (15) for said shaft (14) and for supplying pumped medium as a liquid and/or gas phase sealing fluid to a sealing part (15) positioned about said shaft near the gas transport channel (12) to seal the gas transport channel from the surrounding atmosphere, said pumped medium being supplied to said conduit (17) or said reservoir (16) from said gas transport channel (12).
2. A device according to claim 1, characterized in that a condensate reservoir (16) is arranged in direct connection with said bearing part (15) to feed condensate lubricant into the bearing part.
3. A device according to claim 1 or 3 characterized in that the bearing part (15) is longitudinally divided.
EP19840850285 1983-10-20 1984-09-26 A gas pumping device Expired EP0138793B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8305775A SE457365B (en) 1983-10-20 1983-10-20 DEVICE FOR PUMPING OF GAS
SE8305775 1983-10-20

Publications (2)

Publication Number Publication Date
EP0138793A1 EP0138793A1 (en) 1985-04-24
EP0138793B1 true EP0138793B1 (en) 1988-06-15

Family

ID=20352976

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840850285 Expired EP0138793B1 (en) 1983-10-20 1984-09-26 A gas pumping device

Country Status (3)

Country Link
EP (1) EP0138793B1 (en)
DE (1) DE3472143D1 (en)
SE (1) SE457365B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7048814B2 (en) * 2002-02-08 2006-05-23 Applied Materials, Inc. Halogen-resistant, anodized aluminum for use in semiconductor processing apparatus

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR490059A (en) * 1917-05-05 1919-04-01 Alexandre Cabrier Hermetic vacuum compressor for gas
US2391512A (en) * 1943-10-21 1945-12-25 Westinghouse Electric Corp Blower apparatus
CH340106A (en) * 1956-03-10 1959-07-31 Sulzer Ag Turbomachine with a sealed shaft
US2973136A (en) * 1957-06-13 1961-02-28 Garrett Corp Compressor
CH400438A (en) * 1963-05-31 1965-10-15 Sulzer Ag Shaft seal of a blower
CH480543A (en) * 1967-08-18 1969-10-31 Sulzer Ag System for conveying, compressing or circulating gases with a conveying fan driven by an electric motor
US4311004A (en) * 1979-10-26 1982-01-19 Rotoflow Corporation Gas compression system and method

Also Published As

Publication number Publication date
EP0138793A1 (en) 1985-04-24
DE3472143D1 (en) 1988-07-21
SE8305775L (en) 1985-04-21
SE8305775D0 (en) 1983-10-20
SE457365B (en) 1988-12-19

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