GB2116634A - Rotary positive-displacement fluid-machines - Google Patents
Rotary positive-displacement fluid-machines Download PDFInfo
- Publication number
- GB2116634A GB2116634A GB08305332A GB8305332A GB2116634A GB 2116634 A GB2116634 A GB 2116634A GB 08305332 A GB08305332 A GB 08305332A GB 8305332 A GB8305332 A GB 8305332A GB 2116634 A GB2116634 A GB 2116634A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chamber
- rotors
- compressor
- support structure
- shaft
- 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.)
- Withdrawn
Links
- 238000006073 displacement reaction Methods 0.000 title 1
- 210000004907 gland Anatomy 0.000 claims abstract description 21
- 238000007789 sealing Methods 0.000 claims abstract description 19
- 238000005096 rolling process Methods 0.000 claims abstract description 9
- 230000001050 lubricating effect Effects 0.000 claims abstract description 7
- 125000006850 spacer group Chemical group 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 2
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
- F04C27/008—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine
- F04C27/009—Shaft sealings specially adapted for pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/002—Sealings comprising at least two sealings in succession
- F16J15/004—Sealings comprising at least two sealings in succession forming of recuperation chamber for the leaking fluid
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Supercharger (AREA)
Abstract
In a Roots-type compressor the shafts 8, 9 of the rotors are supported by "rolling" bearings 10 and a lipped sealing-gland 14 associated with each bearing separates the bearing lubricating environment from an annular chamber 15, which is adjacent the rotor chamber 7 and substantially isolated therefrom by a labyrinth seal 16. The annular chamber communicates with the atmosphere through a hole (18), Fig.2 (not shown), so as to prevent the lip of the sealing gland from being subjected to excessive loads owing to negative or positive pressures transmitted from the rotor chamber past the labyrinth seal. <IMAGE>
Description
SPECIFICATION
Rotary volumetric compressor of the Roots type
The present invention relates to a rotary volumetric compressor of the Roots type, comprising a support structure, two rotors mounted rotatably in a chamber within the support structure, and a pair of shafts connected to the two rotors and having their ends mounted rotatably in the support structure by means of rolling bearings, in which a lipped sealing gland is provided at each end of the shafts to separate the lubricating environment of the bearing from a respective annular chamber which is adjacent the chamber of the two rotors and is isolated therefrom by a labyrinth seal.
The object of the present invention is to prevent the lips of the sealing glands from being subjected to excessive loads (which would reduce the effectiveness and/or the lifetime of the glands), as a result of the pressures or pressure drops which occur in the rotor chamber during operation of the compressor.
In orderto achieve this object, the invention provides a compressor of the aforesaid type, characterised in that the annular chamber adjacent each lipped sealing gland communicates with a respective hole formed through the support structure to the exterior.
The present invention will now be described with reference to the appended drawings, provided
purely by way of non-limiting example, in which:
Figure lisa partially sectioned view of a com
pressor according to the present invention, and
Figure 2 is a section taken on the line ll-ll of Figure
1.
In the drawings, there is shown a rotary volumetric
compressor of the Roots type, generally indicated 1,
usable, for example, for supercharging an internal combustion engine.
The compressor 1 comprises a support structure 2 including an externally-finned casing 3 closed at one end by a cover 4 and at the opposite end by a plate 5 and a cover 6.
The casing 3 has an internal chamber 7 housing the two rotors (not visible in the drawings) of the compressor.
The two rotors of the compressor are connected for rotation with two shafts 8,9 the ends of which are mounted rotatably within the plate 5 and the cover 4, respectively, by means of rolling bearings 10.
The shaft 8 has one end 8a projecting from the cover 6, onto which is keyed a gear wheel 11 for connection by a cogged belt to the driving shaft or cam shaft of the engine with which the compressor is associated.
The drive is transmitted from the shaft 8 to the shaft 9 through the meshing of two gear wheels 12, 13 connected for rotation with the shafts.
With each rolling bearing 10 is associated a lipped sealing gland 14 which separates the lubricating environment of the respective bearing from an annular chamber 15 adjacent the chamber 7 of the two rotors.
Each annular chamber 15 is isolated from the chamber 7 of the rotors by a double labyrinth seal 16.
In the case of the two sealing glands 14 mounted in the plate 5, each double labyrinth seal 16 is formed between the outer surface of a tubular spacer 17 (interposed coaxially of the respective shaft between the bearing and the rotor) and the surface of the hole in the plate 5 in which the spacer 17 is mounted. In the case of the sealing glands 14 mounted in the cover 4, however, each labyrinth seal 16 is formed between the outer surface of the respective shaft and the surface of the hole in the cover 4 in which the shaft is mounted.
In order to prevent the pressures or pressure drops existing in the rotor chamber 7 of the com pressorfrom being transmitted through the labyrinth seal 16 to the annular chambers 15, thereby subjecting the lips of the sealing glands 14 to excessive loads which would render the seals unreliable, each annular chamber 15 (see Figure 2) communicates with a hole 18 formed through the support structure (or, more precisely, the plate 5 or the cover 4) to open onto the outer surface 19 of the compressor.
1. Rotary volumetric compressor of the Roots type, comprising a support structure, two rotors mounted rotatably in a chamber within the support structure, and a pair of shafts connected to the two rotors and having their ends mounted rotatably in the support structure by means of rolling bearings, in which a lipped sealing gland is provided at each end of the shafts to separate the lubricating environment of the bearing from a respective annular chamber which is adjacent the (Ç) chamber of the two rotors and is isolated therefrom by means of a labyrinth seal, characterised in that the annular chamber adjacent each lipped sealing gland communicates with a respective hole formed through the support structure to the exterior.
2. A rotary volumetric compressor as constructed and arranged substantially as hereinbefore described and as shown in the figures of the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (2)
1. Rotary volumetric compressor of the Roots type, comprising a support structure, two rotors mounted rotatably in a chamber within the support structure, and a pair of shafts connected to the two rotors and having their ends mounted rotatably in the support structure by means of rolling bearings, in which a lipped sealing gland is provided at each end of the shafts to separate the lubricating environment of the bearing from a respective annular chamber which is adjacent the (Ç) chamber of the two rotors and is isolated therefrom by means of a labyrinth seal, characterised in that the annular chamber adjacent each lipped sealing gland communicates with a respective hole formed through the support structure to the exterior.
2. A rotary volumetric compressor as constructed and arranged substantially as hereinbefore described and as shown in the figures of the accompanying drawing.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT67296/82A IT1155126B (en) | 1982-03-10 | 1982-03-10 | ROOTS TYPE ROTARY VOLUMETRIC COMPRESSOR |
Publications (2)
Publication Number | Publication Date |
---|---|
GB8305332D0 GB8305332D0 (en) | 1983-03-30 |
GB2116634A true GB2116634A (en) | 1983-09-28 |
Family
ID=11301234
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08305332A Withdrawn GB2116634A (en) | 1982-03-10 | 1983-02-25 | Rotary positive-displacement fluid-machines |
Country Status (4)
Country | Link |
---|---|
DE (2) | DE3308363A1 (en) |
FR (1) | FR2523223A1 (en) |
GB (1) | GB2116634A (en) |
IT (1) | IT1155126B (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4813857A (en) * | 1986-03-31 | 1989-03-21 | Aisin Seiki Kabushiki Kaisha | Roots blower |
EP0320956A2 (en) * | 1987-12-18 | 1989-06-21 | Hitachi, Ltd. | Screw type vacuum pump |
FR2638788A1 (en) * | 1988-11-07 | 1990-05-11 | Cit Alcatel | MULTI-STAGE ROOTS TYPE VACUUM PUMP |
GB2247047A (en) * | 1990-07-17 | 1992-02-19 | Bombas Stork S A | Shaft sealing in lobe rotor pump |
FR2774133A1 (en) * | 1998-01-28 | 1999-07-30 | Luk Fahrzeug Hydraulik | Pump for hydraulic oil |
EP0959251A1 (en) * | 1998-05-18 | 1999-11-24 | SGI-PROZESS-TECHNIK GmbH | Rotary gear compressor and method for its operation |
US6659227B2 (en) | 2001-05-08 | 2003-12-09 | Kabushiki Kaisha Toyota Jidoshokki | Oil leak prevention structure for vacuum pump |
CN104100524A (en) * | 2014-07-31 | 2014-10-15 | 山东省章丘鼓风机股份有限公司 | Roots blower with combined sealing structure |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3619645A1 (en) * | 1986-05-08 | 1987-11-12 | Wankel Gmbh | Bearing arrangement for a rotary piston ventilator with an external axis |
DE3725902A1 (en) * | 1987-08-05 | 1989-02-16 | Bayer Ag | MIXTURES OF CHLOROPRENE POLYMERS AND THEIR PREPARATION |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB559226A (en) * | 1942-08-07 | 1944-02-09 | Douglas Rudolf Pobjoy | Improvements in and relating to rotary pumps |
GB559729A (en) * | 1942-09-14 | 1944-03-02 | Frederick George Horstmann | Improvements in and relating to rotary pumps |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2128928A5 (en) * | 1971-03-09 | 1972-10-27 | Commissariat Energie Atomique | |
FR2214337A5 (en) * | 1973-01-11 | 1974-08-09 | Hydroperfect Int | |
GB1484994A (en) * | 1973-09-03 | 1977-09-08 | Svenska Rotor Maskiner Ab | Shaft seal system for screw compressors |
-
1982
- 1982-03-10 IT IT67296/82A patent/IT1155126B/en active
-
1983
- 1983-02-25 GB GB08305332A patent/GB2116634A/en not_active Withdrawn
- 1983-03-09 FR FR8303855A patent/FR2523223A1/en not_active Withdrawn
- 1983-03-09 DE DE19833308363 patent/DE3308363A1/en not_active Ceased
- 1983-03-09 DE DE19838306813U patent/DE8306813U1/en not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB559226A (en) * | 1942-08-07 | 1944-02-09 | Douglas Rudolf Pobjoy | Improvements in and relating to rotary pumps |
GB559729A (en) * | 1942-09-14 | 1944-03-02 | Frederick George Horstmann | Improvements in and relating to rotary pumps |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4813857A (en) * | 1986-03-31 | 1989-03-21 | Aisin Seiki Kabushiki Kaisha | Roots blower |
US4984974A (en) * | 1987-12-18 | 1991-01-15 | Hitachi, Ltd. | Screw type vacuum pump with introduced inert gas |
EP0320956A2 (en) * | 1987-12-18 | 1989-06-21 | Hitachi, Ltd. | Screw type vacuum pump |
EP0320956A3 (en) * | 1987-12-18 | 1990-02-21 | Hitachi, Ltd. | Screw type vacuum pump |
US4990069A (en) * | 1988-11-07 | 1991-02-05 | Societe Anonyme Dite: Alcatel Cit | Multi-stage roots vacuum pump with sealing module |
EP0368122A1 (en) * | 1988-11-07 | 1990-05-16 | Alcatel Cit | Multistage Roots vacuum pump |
FR2638788A1 (en) * | 1988-11-07 | 1990-05-11 | Cit Alcatel | MULTI-STAGE ROOTS TYPE VACUUM PUMP |
GB2247047A (en) * | 1990-07-17 | 1992-02-19 | Bombas Stork S A | Shaft sealing in lobe rotor pump |
GB2247047B (en) * | 1990-07-17 | 1994-05-04 | Bombas Stork S A | Lobe rotor pump |
FR2774133A1 (en) * | 1998-01-28 | 1999-07-30 | Luk Fahrzeug Hydraulik | Pump for hydraulic oil |
EP0959251A1 (en) * | 1998-05-18 | 1999-11-24 | SGI-PROZESS-TECHNIK GmbH | Rotary gear compressor and method for its operation |
US6659227B2 (en) | 2001-05-08 | 2003-12-09 | Kabushiki Kaisha Toyota Jidoshokki | Oil leak prevention structure for vacuum pump |
CN104100524A (en) * | 2014-07-31 | 2014-10-15 | 山东省章丘鼓风机股份有限公司 | Roots blower with combined sealing structure |
Also Published As
Publication number | Publication date |
---|---|
FR2523223A1 (en) | 1983-09-16 |
DE8306813U1 (en) | 1985-01-17 |
IT1155126B (en) | 1987-01-21 |
IT8267296A0 (en) | 1982-03-10 |
GB8305332D0 (en) | 1983-03-30 |
DE3308363A1 (en) | 1983-09-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |