WO1980002863A1 - Ejector - Google Patents
Ejector Download PDFInfo
- Publication number
- WO1980002863A1 WO1980002863A1 PCT/SE1980/000168 SE8000168W WO8002863A1 WO 1980002863 A1 WO1980002863 A1 WO 1980002863A1 SE 8000168 W SE8000168 W SE 8000168W WO 8002863 A1 WO8002863 A1 WO 8002863A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- nozzle
- nozzles
- ejector
- inlet
- diameter
- Prior art date
Links
Classifications
-
- 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
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
- F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids
- F04F5/20—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids for evacuating
- F04F5/22—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids for evacuating of multi-stage type
Definitions
- the present invention relates to ejectors and more precisely to what is called a multi-ejector in which several ejectors are arranged in series and sometimes also abreast.
- Fig. 1 shows a schematic mostly sectioned view through a multi- ejector having four nozzles located in series, a d
- Fig.2 is a sectional view through a nozzle intended to be used in the multi-ejector in accordance with the invention.
- the multi-ejector 1 in accordance with the invention comprises a housing 2 having a substanitally parallel- epipedic shape and having five compartments 2 to 6 located in series nozzles 7 to 10 which are arranged on a common axis 11 are mounted in the partition walls between the compartments.
- first compartment 2 To the first compartment 2 there is an inlet 12 for pressurized air.
- second compartment 3 In the adjacent second compartment 3 there is an opening 17 for delivery of the negative pressure created by the multi-ejector 1.
- first nozzle 7 and corresponding nozzles 8- 10 are located in the rest of the partition walls 14-16, the size of the nozzles increasing frcr ⁇ the first nozzle 7.
- the partition wall 16 there is also an opening but in the shown embodiment said opening is closed by the aid of a plug 20.
- Said plug may be substituted by a flap valve if it is desired to increase the capacity of the multi-ejector.
- this also means that a further nozzle has to be mounted in the opening in the end wall which in the shown embodiment is closed by a plug 21 and also the outlet 22 is then plugged.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
Multi-ejector having at least one set of between two and four nozzles (7-10) arranged in series in order of size in the flow direction, the smallest nozzle (7) constituting the first nozzle. The novel feature of the present multi-ejector resides in the fact that by using the below given connections between the inlet and outlet diameters of the nozzles as well as the distances between adjacent nozzles starting from the inlet diameter (a) of the first nozzle (7) there have been obtained negative pressures amounting to between 7 and 10% of actual air pressure when using a positive pressure of between 3.7 and 6.0 kilopounds per square centimeters. Nozzle Inlet Outlet Distances to Diameter Diameter succeeding nozzles First (7) a 1.5a 0a Second (8) 2.1-2.2a 2.3-2.4a 5a Third (9) 3.6-3.7a 4.0-4.1a 2.5a Fourth (10) 4.5-4.6a 5.6-5.7a
Description
EJECTOR
Technical Field
The present invention relates to ejectors and more precisely to what is called a multi-ejector in which several ejectors are arranged in series and sometimes also abreast.
Background Art
By the aid of such multi-ejectors it has been possible to obtain negative pressures corresponding to about 50% of the actual air pressure when using a positive pressure of about 4 kilopounds per square centimeters. However, a desideratum has been to reach stronger negative pressures at corresponding positive pressures.
ulti-ejec%ors have, however, been in use during many years and the efficiency thereof has more or less been accepted. Nevertheless, it has now been shown that it has been possible by making very small alterations to reach so strong negative pressures that they correspond to only 7% of the actual air pressure when using a positive pressure of about 4 kilopounds per square centimeters.
This extremely good result has been reached by a special adaption of the relations between the diameters of the inlet and outlet openings of the nozzles as well as the distances between the nozzles looted in series.
Description of Drawing
The invention is more closely described in the following in connection with the attached drawing in which
Fig. 1 shows a schematic mostly sectioned view through a multi- ejector having four nozzles located in series, a d
Fig.2 is a sectional view through a nozzle intended to be used in the multi-ejector in accordance with the invention.
OMPI /,. WIPO ,Λ,
Disclosure of Invention
In the shown embodiment the multi-ejector 1 in accordance with the invention comprises a housing 2 having a substanitally parallel- epipedic shape and having five compartments 2 to 6 located in series nozzles 7 to 10 which are arranged on a common axis 11 are mounted in the partition walls between the compartments.
To the first compartment 2 there is an inlet 12 for pressurized air. In the adjacent second compartment 3 there is an opening 17 for delivery of the negative pressure created by the multi-ejector 1. In the partition wall 14 between the second compartment 3 and third compartment 4 there is a first nozzle 7 and corresponding nozzles 8- 10 are located in the rest of the partition walls 14-16, the size of the nozzles increasing frcrπ the first nozzle 7.
In the partition walls 14 and 15 there are through openings which are closed by simple flap valves 18, 19. The operation of said flap valves is such that when the pressure in compartment 3 increases over the pressure in compartment 4 the flap valve 18 opens and when the pressure in compartment 4 is increasing over the pressure in compartment 5 then the flap valve 19 opens.
In the partition wall 16 there is also an opening but in the shown embodiment said opening is closed by the aid of a plug 20. Said plug may be substituted by a flap valve if it is desired to increase the capacity of the multi-ejector. However, this also means that a further nozzle has to be mounted in the opening in the end wall which in the shown embodiment is closed by a plug 21 and also the outlet 22 is then plugged.
The multi-ejector so far described is known and by the aid thereof it is possible to create negative pressures amounting to about 50% of actual air pressure. However, it has been shown that negative pressures corresponding to only 7% of the actual air pressure have
been obtained by' very small alterations of the relations between the inlet a d outlet diameters of the nozzles as well as the distances between the nozzles.
As ejectors of the type to Which the present invention relates are known since long ago and have been in general use in many different applications, the general conception has been that they have obtained their final shape. Nevertheless, the present invention shows that very essential improvements can be obtained by very small measures.
In a practical test in Which the connections given in the following between the inlet and outlet diameters of the nozzles as well as the distances to succeeding nozzles have been carried out there was obtained when using a posititive pressure between 3.7 and 6.0 kilopounds per square centimeters a negative pressure corresponding to 7% of the actual air pressure.
Nozzle Inlet Diameter Outlet Diameter Distance to Succee- ding Nozzles
First (7) a 1.5a Oa
Second (8) 2.17a 2.38a 5a
Third (9) 3.67a 4.08a 2.5a
Fourth (10) 4.58a 5.69a
Hence, with the above given values there was obtained a result which was maximal. However, small variations of the diameters from the ones referred to above have shown to influence the negative pressure to very little extent, which, on the contrary, greater variations have made. Hence, negative pressures corresponding to between 7 and 10% of the actual air pressure have been obtained when the diameters have been located within the values stated below when the distances between the nozzles have been maintained in accordance with what is stated above.
Nozzle Inlet Diameter Outlet Diameter Distance to Succee- ding Nozzle
First (7) a 1.5a 0a
Second (8) 2.1-2.2a 2.3-2.4a 5a
Third (9) 3.6-3.7a 4.0-4.la 2.5a
Fourth (10) 4.5-4.6a 5.6-5.7a
Hence, by the present invention there has been obtained an essential improvement of the capacity for creating negative pressures of known multi-ejectors by measures which were not at all expected to give any improvement worth mentioning.
However, it is clear that when using less nozzles then four a corresponding improvement is obtained in comparisicn with previously known ejectors having a corresponding number of nozzles.
Claims
CLAIM
Multi-ejector comprising at least one set of between two and four nozzles (7-10) arranged in series in order of size in the flow direction, the smallest nozzle (7) constituting the first nozzle, characterized by the fact that the following connections are valid starting frcm the inlet diameter (a) of the first nozzle (7):
Nozzle Inlet Diameter Outlet Diameter Distance to Succee- ding Nozzle
First (7) a 1.5a . Oa
Second (8) 2.1-2.2a 2.3-2.4a 5a
Third (9)' 3.6-3.7a 4.0-4.la 2.5a
Fourth (10) 4.5-4.6a 5.6-5.7a
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE803049647T DE3049647T1 (en) | 1979-06-15 | 1980-06-12 | EJECTOR |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7905309A SE427954B (en) | 1979-06-15 | 1979-06-15 | EJECTOR |
SE7905309 | 1979-06-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1980002863A1 true WO1980002863A1 (en) | 1980-12-24 |
Family
ID=20338304
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1980/000168 WO1980002863A1 (en) | 1979-06-15 | 1980-06-12 | Ejector |
Country Status (6)
Country | Link |
---|---|
JP (1) | JPS56500814A (en) |
AU (1) | AU549039B2 (en) |
DE (1) | DE3049647T1 (en) |
GB (1) | GB2066900B (en) |
SE (1) | SE427954B (en) |
WO (1) | WO1980002863A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4466778A (en) * | 1980-07-05 | 1984-08-21 | Volkmann Juergen | Ejector device |
WO1986001582A1 (en) * | 1984-08-24 | 1986-03-13 | Michael Laumen | Refrigerator or heat pump and jet pump therefor |
EP0346314A2 (en) * | 1988-06-08 | 1989-12-13 | Peter Tell | Vacuum ejector device |
FR2685739A1 (en) * | 1991-11-27 | 1993-07-02 | Dan Greenberg | MULTIPLE EJECTOR DEVICE FOR VACUUM PUMP. |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9017791D0 (en) * | 1990-08-14 | 1990-09-26 | Portsmouth Tech Consult | Vacuum gripper devices |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE321704C (en) * | 1916-06-10 | 1920-06-11 | British Westinghouse Electric | Jet apparatus for elastic equipment |
US1729794A (en) * | 1929-10-01 | Injector ptjmp | ||
US2078614A (en) * | 1935-02-05 | 1937-04-27 | G & J Weir Ltd | Multistage ejector |
SE370765B (en) * | 1973-12-05 | 1974-10-28 | Piab Ab |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR361049A (en) * | 1905-11-27 | 1906-05-14 | Westinghouse Electric Corp | Advanced diffuser system for ejector |
DE389520C (en) * | 1918-08-13 | 1924-02-11 | Kurt Hoefer Dr Ing | Jet machine |
DE561872C (en) * | 1929-08-22 | 1932-10-19 | Schmidt Paul | Conveying liquids at high pressure by means of liquid jet pumps |
DE3025525A1 (en) * | 1980-07-05 | 1982-01-28 | Jürgen 4477 Welver Volkmann | EJECTOR DEVICE |
-
1979
- 1979-06-15 SE SE7905309A patent/SE427954B/en unknown
-
1980
- 1980-06-12 AU AU60504/80A patent/AU549039B2/en not_active Expired
- 1980-06-12 DE DE803049647T patent/DE3049647T1/en active Granted
- 1980-06-12 GB GB8104652A patent/GB2066900B/en not_active Expired
- 1980-06-12 JP JP50133980A patent/JPS56500814A/ja active Pending
- 1980-06-12 WO PCT/SE1980/000168 patent/WO1980002863A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1729794A (en) * | 1929-10-01 | Injector ptjmp | ||
DE321704C (en) * | 1916-06-10 | 1920-06-11 | British Westinghouse Electric | Jet apparatus for elastic equipment |
US2078614A (en) * | 1935-02-05 | 1937-04-27 | G & J Weir Ltd | Multistage ejector |
SE370765B (en) * | 1973-12-05 | 1974-10-28 | Piab Ab |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4466778A (en) * | 1980-07-05 | 1984-08-21 | Volkmann Juergen | Ejector device |
WO1986001582A1 (en) * | 1984-08-24 | 1986-03-13 | Michael Laumen | Refrigerator or heat pump and jet pump therefor |
US4748826A (en) * | 1984-08-24 | 1988-06-07 | Michael Laumen Thermotechnik Ohg. | Refrigerating or heat pump and jet pump for use therein |
EP0346314A2 (en) * | 1988-06-08 | 1989-12-13 | Peter Tell | Vacuum ejector device |
EP0346314A3 (en) * | 1988-06-08 | 1990-07-25 | Peter Tell | Vacuum ejector device |
FR2685739A1 (en) * | 1991-11-27 | 1993-07-02 | Dan Greenberg | MULTIPLE EJECTOR DEVICE FOR VACUUM PUMP. |
ES2105921A2 (en) * | 1991-11-27 | 1997-10-16 | Greenberg Dan | Multi ejector vacuum pump |
Also Published As
Publication number | Publication date |
---|---|
SE427954B (en) | 1983-05-24 |
SE7905309L (en) | 1980-12-16 |
AU6050480A (en) | 1981-01-05 |
DE3049647C2 (en) | 1991-08-01 |
GB2066900B (en) | 1983-04-20 |
AU549039B2 (en) | 1986-01-09 |
JPS56500814A (en) | 1981-06-18 |
DE3049647T1 (en) | 1982-02-25 |
GB2066900A (en) | 1981-07-15 |
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