WO2015101904A1 - Rotary pump with safety valve and operating method thereof - Google Patents
Rotary pump with safety valve and operating method thereof Download PDFInfo
- Publication number
- WO2015101904A1 WO2015101904A1 PCT/IB2014/067269 IB2014067269W WO2015101904A1 WO 2015101904 A1 WO2015101904 A1 WO 2015101904A1 IB 2014067269 W IB2014067269 W IB 2014067269W WO 2015101904 A1 WO2015101904 A1 WO 2015101904A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rotor
- pumping chamber
- internal wall
- chamber
- discharge
- Prior art date
Links
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
- 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
- F04C18/344—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 with vanes reciprocating with respect to the inner member
- F04C18/3441—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 with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
-
- 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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
- F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
-
- 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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
- F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
- F04C29/126—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type
-
- 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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
- F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
- F04C29/126—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type
- F04C29/128—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type of the elastic type, e.g. reed valves
Abstract
Rotary pump (50) connectable to a thermal engine, comprising: a housing (40) comprising a pumping chamber (15) having an internal wall (42); a rotor (18) adapted to rotate substantially tangentially to said internal wall (42) in correspondence of an area of tangency (17); a vane (22) mounted radially slidable within a slot formed in the rotor (18), wherein during the rotation of the rotor (18) said pumping chamber (15) is divided by the vane (22) and the rotor (18) into a suction chamber (33) into which a fluid to be compressed is sucked and a compression chamber (38) in which the fluid is compressed; a safety valve (20) formed in the internal wall (42) near the area of tangency (17) between the rotor (18) and the internal wall (42) and adapted to discharge a residual fluid outside the pumping chamber (15), said rotary pump (50) further comprising: a discharge outlet (11, 12) of the safety valve (20) formed in the pumping chamber (15) in a zone near the area of tangency (17) between the rotor (18) and the internal wall (42); and an interspace (35) formed within the housing (40) and connected to an exhaust duct (16) adapted to discharge the fluid outside the pumping chamber (15), said discharge outlet (11, 12) being formed with a radial opening relative to the axis of the pumping chamber (15) and being adapted to put the pumping chamber (15) in communication with the interspace (35).
Description
ROTARY PUMP WITH SAFETY VALVE AND OPERATING METHOD THEREOF
Description
Technical field
The present invention relates to rotary pumps, and more specifically it concerns a safety valve for a rotary pump.
Preferably, but not exclusively, the invention is applied in the so-called single-vane pumps, i.e. pumps where the rotor includes a single vane with constant length, and the following description will mainly refer to this preferred application.
Prior art
Single-vane pumps are often used as vacuum pumps, for instance in the automotive field. They comprise a body defining a chamber, for instance with approximately elliptical cross section, in which the rotor rotates, substantially in tangential contact, about an eccentric axis. The rotor has a diametrical slot where the vane is mounted and the vane is radially movable in the slot so that, while the rotor is rotating, the vane ends slide substantially in contact with the internal wall of the chamber. The chamber is divided by the rotor and the vane into a suction room and a pressure room, between which a pumped fluid is displaced.
In pumps used in motor car engines, as the rotor and the vane rotate, air is sucked from the power brake through non-return one-way valves and is mixed with oil sent to the pump by the engine lubrication pump. The mixed air and oil are subsequently compressed in the chamber and then discharged into the engine.
A problem that can arise in known rotary pumps is due to the presence of oil within the pump, which takes place for instance if the suction valve(s) do(es) not have a perfect seal or, when the engine is stopped, because of oil suction into the pump.
The phenomenon of oil suction may be due to the permanence of a depression inside the pump for relatively short but significant periods, occurring when the engine is turned off: such oil, if it is not discharged, can give rise to problems at the cold start of the engine.
Another technical problem, known as counter-rotation, can arise in case the engine onto which the pump is mounted, after having been turned off, rotates in the reverse direction, driven by the vehicle drive system. Such a problem, if oil suction has occurred, can cause a hydraulic lock with consequent pump breaking.
Use of a safety valve in the suction chamber, arranged to discharge oil under
pressure towards the oil sump, thereby solving the problem of the counter-rotation, is known in the art.
Document EP 1890040 discloses an example of rotary vacuum pump having a safety valve with a movable, swivelling vane, a bypass connection and a tank for storage of the residual oil. The safety valve is an additional valve that can be combined with the discharge valve of the pump.
In general, pumps are known in which an opening is formed for discharging, through a one-way valve, fluid that has been sucked or is any case present inside them. In such pumps, the safety valve is usually coaxially formed with the rotation axis of the rotor and directly discharges the fluid into the support onto which the pump is flanged.
Due to such geometry of the valve, the flow area of the discharged fluid is insufficient to ensure the discharge of the fluid when the latter mainly consists of a liquid that is very dense by its nature or whose density has increased because of the low temperature.
Description of the Invention
It is an object of the present invention to provide a rotary pump with a safety valve solving the problems of the prior art.
According to the invention, this is achieved by means of a rotary pump comprising an interspace formed within the pump housing near the area of tangency between the rotor and the internal wall of the pumping chamber.
The interspace communicates with the pumping chamber through the discharge outlet of a safety valve and is connected to a discharge duct arranged to discharge the fluid outside the pumping chamber.
The discharge outlet is formed with a radial opening relative to the axis of the pumping chamber and radially discharges the fluid.
In a further aspect, the invention also provides a method of operating a rotary pump, comprising a discharge step in which the fluid to be compressed is discharged from the safety valve in a radial direction relative to the axis of the pumping chamber through the discharge outlet
Brief Description of the Figures
The above and other features and advantages of the present invention will become apparent from the following description of preferred embodiments given by way of non limiting examples with reference to the accompanying drawings, which show the invention applied to a single-vane pump and in which:
- Fig. 1 is a plan view of a rotary pump with a safety valve according to the invention, without the cover and with the valve region being shown partially in cross-section; and
- Fig. 2 is a cross-sectional view of a rotary pump with the safety valve according to the invention, without the rotor and the vane.
Description of Preferred Embodiments
The invention will be described in detail referring to its application in a single-vane pump, as defined above.
Referring to Figs. 1 and 2, a pump 50 according to the invention includes a housing 40 defining a pumping chamber 15, for instance with approximately elliptical cross section, having an internal wall 42. Chamber 15 accommodates a rotor 18 that, in known manner, rotates in substantially tangential contact with said internal wall 42 in correspondence of an area of tangency 17. The rotor has a radial slot in which a vane 22, radially slidable within the same slot, is mounted. During the counterclockwise rotation of rotor 18, the vane and the rotor divide chamber 15 into a suction chamber 33, into which a fluid to be compressed is sucked, and a compression chamber 38 in which the fluid is compressed.
Pump 50 further comprises a suction duct 10, ending into suction chamber 33, through the suction valve of known type (not shown) from which the fluid to be compressed is sucked, and a discharge duct 16, which ends into compression chamber 38 through the discharge valve of known type (not shown) and is arranged to discharge the fluid outside pumping chamber 15.
The vacuum pump according to the invention shown in Figs. 1 and 2 includes a safety valve 20, formed in the internal wall 42 near the area of tangency 17 between rotor 18 and internal wall 42 and adapted to discharge a residual fluid, e.g. oil remained within pumping chamber 15, outside the chamber.
Safety valve 20 includes a discharge outlet 11, 12 formed in pumping chamber 15 in a zone adjacent to the area of tangency 17 between rotor 18 and internal wall 42 of the chamber.
Discharge outlet 11, 12 puts pumping chamber 15 in communication with an interspace 35 formed within housing 40, and it is formed with a radial opening relative to the axis of pumping chamber 15.
Preferably, safety valve 20 includes a first discharge outlet 11 formed in suction chamber 33, preferably in a zone of internal wall 42 between the inlet of suction duct 10 and the area of tangency 17.
Preferably, safety valve 20 further includes a second discharge outlet 12 formed in compression chamber 38, preferably in a zone of internal wall 42 between the inlet of the discharge valve and the area of tangency 17. Both discharge outlets end into discharge duct 16.
Preferably, the first discharge outlet 11 and the second discharge outlet 12 can put suction chamber 33 and compression chamber 38, respectively, in communication with interspace 35.
Interspace 35 in turn is permanently connected to discharge duct 16 adapted to discharge the fluid, e.g. the residual fluid discharged from pumping chamber 15 through safety valve 20, outside interspace 35.
Discharge outlets 11, 12 are radial openings relative to the axis of pumping chamber 15, and they are formed on internal wall 42 of chamber 15 in the region of tangency between rotor 18 and internal wall 42, in correspondence of the suction and discharge regions.
Outlets 11, 12 are closed by a flexible or rigid lamina 13 mounted in abutment against the internal wall of interspace 35.
Lamina 13 is made of metal, e.g. spring steel in case of a flexible lamina and steel sheet in case of rigid lamina, or of a composite polymer such as Kevlar, or of carbon fibres, and is shaped in known manner so as to ensure the closure of outlets 11, 12. Preferably lamina 13, if it is made of rigid or flexible steel, has its surface turned towards outlets 11, 12 coated with a rubber of suitable type, compatible with the concerned fluids and temperatures, preferably "Viton" rubber, in order to ensure the seal of valve 20.
Lamina 13 is maintained in abutment against the internal wall of interspace 35 by a spring 14, for instance a leaf spring 14 articulated in a seat 19 formed on the external wall of interspace 35.
In an alternative embodiment of the invention, lamina 13 is maintained in abutment by two leaf springs.
In a further embodiment of pump 50 according to the invention, lamina 13 is maintained in abutment by only one spring, located between the first discharge outlet 11 and the second discharge outlet 12.
The invention also concerns a method of operating a rotary pump 50 connectable to a thermal engine, said pump 50 comprising: a pumping chamber 15; a rotor 18 adapted to rotate substantially tangentially to an internal wall 42 of said pumping chamber 15; a vane 22 mounted radially slidable within a slot formed in rotor 18; a safety valve 20 formed in
the internal wall 42 and having a discharge outlet 11, 12 formed with a radial opening relative to the axis of pumping chamber 15; said pumping chamber 15 being divided by vane 22 and rotor 18 into a suction chamber 33 and a compression chamber 38; said method comprising the following steps occurring twice at each revolution of the rotor: 1) a suction step, in which the fluid to be compressed is sucked into suction chamber 33;
2) an isolation step, in which the sucked gas is isolated, not being in communication with the suction and discharge ducts;
3) a compression step, in which the fluid to be compressed is compressed in compression chamber 38;
4) a discharge step, in which the fluid to be compressed is discharged from safety valve 20 in a radial direction relative to the axis of pumping chamber 15 through said discharge outlet 11, 12.
In the operation of a vacuum pump according to the invention, as rotor 18 and vane 22 rotate counterclockwise, air sucked through suction duct 10 is mixed in pumping chamber 15 with oil sent by means of an engine lubrication pump. The mixed air and oil are subsequently compressed in compression chamber 38 and then discharged into the engine through discharge duct 16.
During such an operation lamina 13, pushed by leaf spring 14, keeps discharge outlets 11, 12 closed.
If a counter-rotation occurs when the motor is turned off and oil suction into suction chamber 33 has taken place, the first discharge outlet 11 of safety valve 20 opens due to the action of the pressurised fluid that displaces lamina 13 by overcoming the force exerted by leaf spring 14, thereby allowing the fluid to be discharged into interspace 35 and hence into discharge duct 16.
The second discharge outlet 12 of safety valve 20 can operate in two different modes.
In a first mode, leaf spring 14 is so constructed as to make the second discharge outlet 12 open at the normal discharge pressures. In this case, the valve increases the amount of fluid being discharged through the discharge duct both under the normal operating conditions and in case of cold start at low temperature in the presence of liquid made very dense because of the temperature in the compression chamber.
In a second operating mode, leaf spring 14 is so constructed as to make the second discharge outlet 12 open at pressures higher than the normal discharge pressures. In this case, the valve increases the amount of fluid being discharged through the discharge duct
only in case of cold start at low temperature in the presence of liquid in the compression chamber, thereby saving the pump integrity.
Advantageously, in both operating manners, safety valve 20 according to the invention, having radial discharge outlets 11, 12 with large areas, located close to and spanning the area of tangency between rotor 18 and housing 40, allows having very wide flow areas for the fluid to be discharged.
Moreover, safety valve 20 according to the invention, thanks to the provision of interspace 35, allows forming discharge duct 16 connected to the interspace in the region of housing 40 that is the most suitable for accommodating said duct, thereby allowing keeping wide discharge cross sectional areas over the whole path from discharge outlets 11, 12 to discharge duct 16.
Advantageously, the rotary pump with safety valve according to the invention allows making a device having a simplified structure and occupying a reduced space in comparison with the known pumps.
Lastly, the need to overdimension the pump housing in order to resist overpressures is eliminated, by reducing the resistant sections by at least three times, what allows constructing a pump with very reduced weight, made of cheaper materials that, in particular, are more durable since they are less mechanically stressed. In this way, a reduction in energy consumption and in the consequent emissions of C02 is allowed.
Claims
1. Rotary pump (50) connectable to a thermal engine, comprising:
- a housing (40) comprising a pumping chamber (15) having an internal wall (42);
- a rotor (18) adapted to rotate substantially tangentially to said internal wall (42) in correspondence of an area of tangency (17);
- a vane (22) mounted radially slidable within a slot formed in the rotor (18), wherein during the rotation of the rotor (18) said pumping chamber (15) is divided by the vane (22) and the rotor (18) into a suction chamber (33) into which a fluid to be compressed is sucked, and a compression chamber (38) in which the fluid is compressed;
- a safety valve (20), formed in the internal wall (42) near the area of tangency (17) between the rotor (18) and the internal wall (42) and adapted to discharge a residual fluid outside the pumping chamber (15);
- at least one discharge outlet (11, 12) of the safety valve (20), formed in the pumping chamber (15) in a zone near the area of tangency (17) between the rotor (18) and the internal wall (42) of the pumping chamber; and
- an interspace (35) formed within the housing (40) and connected to a discharge duct (16) adapted to discharge the fluid outside the pumping chamber (15),
said discharge outlet (11, 12) being formed with a radial opening relative to the axis of the pumping chamber (15) and being adapted to put the pumping chamber (15) in communication with the interspace (35);
the pump being characterized in that
said safety valve (20) comprises a first discharge outlet (11) formed in the suction chamber (33) and adapted to put the suction chamber (33) in communication with the interspace (35).
2. Rotary pump (50) according to claim 1, characterized in that said discharge outlet (11, 12) is closed by a lamina (13) mounted abutting against an internal wall of the interspace (35), said lamina (13) being maintained in abutment by a spring (14).
3. Rotary pump (50) according to claim 1 or 2, characterized in that said safety valve (20) comprises a second discharge outlet (12) formed in the compression chamber (38) and adapted to put the compression chamber (38) in communication with the interspace (35).
4. Rotary pump (50) according to any one of claims 1 to 3, characterized in that said first discharge outlet (11) is formed in a zone of the internal wall (42) between the inlet of a suction duct (10) and the area of tangency (17) between the rotor (18) and the
internal wall (42) of the pumping chamber (15).
5. Rotary pump (50) according to claim 3, characterized in that said second discharge outlet (12) is formed in a zone of the internal wall (42) between the inlet of the discharge duct (16) and the area of tangency (17) between the rotor (18) and the internal wall (42) of the pumping chamber (15).
6. Rotary pump (50) according to any one of claims 1 to 5, characterized in that said safety valve (20) comprises said first discharge outlet (11) and said second discharge outlet (12).
7. Rotary pump (50) according to any one of claims 2 to 6, characterized in that said lamina (13) is maintained in abutment by two springs (14).
8. Rotary pump (50) according to any one of claims 2 to 6, characterized in that said spring is a leaf spring (14) articulated in a seat (19) formed in the external wall of the interspace (35).
9. Method of operating a rotary pump (50) connectable to a thermal engine, said pump (50) comprising: a pumping chamber (15); a rotor (18) adapted to rotate substantially tangentially to an internal wall (42) of said pumping chamber (15); a vane (22) mounted radially slidable within a slot formed in the rotor (18); a safety valve (20) formed in the internal wall (42) and having at least one discharge outlet (11, 12) formed with a radial opening relative to the axis of the pumping chamber (15); said pumping chamber (15) being divided by the vane (22) and the rotor (18) into a suction chamber (33) in which a first discharge outlet (11) is formed and a compression chamber (38); said method comprising the following steps:
- a suction step, in which the fluid to be compressed is sucked into the suction chamber (33);
- an isolation step, in which the sucked gas is isolated, not being in communication with the suction duct and the discharge duct;
- a compression step, in which the fluid to be compressed is compressed in the compression chamber (38);
- a discharge step, in which the fluid to be compressed is discharged from the safety valve (20) in a radial direction relative to the axis of the pumping chamber (15) through said at least one discharge outlet (11, 12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP14830728.3A EP3090184B1 (en) | 2013-12-30 | 2014-12-23 | Rotary pump with safety valve and operating method thereof |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT001083A ITTO20131083A1 (en) | 2013-12-30 | 2013-12-30 | ROTARY PUMP WITH SAFETY VALVE AND OPERATING METHOD |
| ITTO2013A001083 | 2013-12-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2015101904A1 true WO2015101904A1 (en) | 2015-07-09 |
Family
ID=50159451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2014/067269 WO2015101904A1 (en) | 2013-12-30 | 2014-12-23 | Rotary pump with safety valve and operating method thereof |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3090184B1 (en) |
| IT (1) | ITTO20131083A1 (en) |
| WO (1) | WO2015101904A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109882414A (en) * | 2017-12-06 | 2019-06-14 | 悦马塑料技术有限公司 | Vacuum pump |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB536934A (en) * | 1940-04-08 | 1941-05-30 | Edward John Beach | Improvements in vacuum pumps |
| DE3819623A1 (en) * | 1988-01-14 | 1989-07-27 | Vdo Schindling | Vane-cell pump |
| US5006052A (en) * | 1988-12-29 | 1991-04-09 | Aisin Seiki Kabushiki Kaisha | Orbital rotor compressor having an inlet passage in the rotor |
| WO2008009251A1 (en) * | 2006-07-21 | 2008-01-24 | Ixetic Hückeswagen Gmbh | Vacuum pump |
| EP1890040A2 (en) | 2002-11-13 | 2008-02-20 | ixetic Hückeswagen GmbH | Vacuum pump |
| US20120060683A1 (en) * | 2010-09-09 | 2012-03-15 | Schwabische Huttenwerke Automotive Gmbh | Vacuum pump with ventilating means |
-
2013
- 2013-12-30 IT IT001083A patent/ITTO20131083A1/en unknown
-
2014
- 2014-12-23 EP EP14830728.3A patent/EP3090184B1/en active Active
- 2014-12-23 WO PCT/IB2014/067269 patent/WO2015101904A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB536934A (en) * | 1940-04-08 | 1941-05-30 | Edward John Beach | Improvements in vacuum pumps |
| DE3819623A1 (en) * | 1988-01-14 | 1989-07-27 | Vdo Schindling | Vane-cell pump |
| US5006052A (en) * | 1988-12-29 | 1991-04-09 | Aisin Seiki Kabushiki Kaisha | Orbital rotor compressor having an inlet passage in the rotor |
| EP1890040A2 (en) | 2002-11-13 | 2008-02-20 | ixetic Hückeswagen GmbH | Vacuum pump |
| WO2008009251A1 (en) * | 2006-07-21 | 2008-01-24 | Ixetic Hückeswagen Gmbh | Vacuum pump |
| US20120060683A1 (en) * | 2010-09-09 | 2012-03-15 | Schwabische Huttenwerke Automotive Gmbh | Vacuum pump with ventilating means |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109882414A (en) * | 2017-12-06 | 2019-06-14 | 悦马塑料技术有限公司 | Vacuum pump |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3090184B1 (en) | 2019-05-08 |
| EP3090184A1 (en) | 2016-11-09 |
| ITTO20131083A1 (en) | 2015-07-01 |
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