GB2262135A

GB2262135A - Multi ejector vacuum pump

Info

Publication number: GB2262135A
Application number: GB9224008A
Authority: GB
Inventors: Dan Greenberg
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-11-27
Filing date: 1992-11-16
Publication date: 1993-06-09
Also published as: ES2105921A2; FR2685739B1; ITBS920136A1; ES2105921B1; AU2973192A; IT1267959B1; ITBS920136A0; DE4239798A1; GB9224008D0; FR2685739A1; IL100168A0; ES2105921R

Abstract

A multi ejector device comprising a housing H forming a number of partitioned chambers 1, 2, 3, 4, 5 having at least two axially mounted sets of ejectors 6, 7 and 8, 9, 10. Pressurised fluid flowing in via inlet 11 and exiting via outlet 13 causes suction about the ejector nozzles successively evacuating the chambers and providing vacuum suction at inlet 12. One way valves 18, 21 prevent back flow of fluid. Increased evacuation capacity may be achieved by mounting further sets of nozzles in the partitioned chambers or by connecting together more than one ejector device (Figs 3 to 5). <IMAGE>

Description

- I - HIGH VACUUM PUMP The present invention rel aLes to ejectors and more

particularly to multi ejectors in which several ejector nozzles are arranged successively. In general, such ejectors an d the inefliods of their production are well known as described in several patents such as U.S. Patents 4696625, 4554956 and 3959864 and European Patent 0041055 which describe an ejector of a configuration which resembles tile present invention.

I'lie various uses arid advantages of these ejectors are widely discussed -in these patents and need no further elaboration, to Me present invention relates to an ejector which is of a different construction and of better seal per performance for higher vacuum, According to the invention there is provided an ejector comprising a housing having an inlel ror pressure medium arid an oullel lherefor and an evacuation inlet and a plurality of suction chambers, each of said suction chamber is provided with two ejector nozzle sets positioned in respective housing partitions, said partitions are provided with one way valves.

The invention will now be described with reference to the annexed drawings in which:

- F.19. 1 is a rflan view of an ejector according to the invention, Fig. 2 is an elevational view of the ejector according to the invention.

Fig. 3 is a cross section of two ejector devices according to the invention connected to each other.

Fig. 4 illustrates the connection of several ejectors by means of a central vacuum flow member.

1 is Figs, 5a, b, c, d, illustrate schematically the connection of several ejeftors as seen in Fig,'4, Turning first to Fig. 1 the ejector according to the invention comprises a housing H having inlet chamber 1 and suction chambers Z, 3, 4 and 5, said chambers being connected by means of a pair of nozzles 6 and 7 and by means of axial nozzles 8, 9 and 10 mounted within partitions "P" which divide said adjacent chambers, The two nozzles 6 and 7 are mounted between chambers I and 3 and are integral witheach other, Intermediate said nozzles 6 and 7, there is provided an opening 23 which is in communication with chamber 2, The inlet chamber is provided with inlet port 11 while chamber ? is provided with evacuation port 12 and chamber 5 is provided with outlet port 13. The housing is provided with cover 15 secured to the housing by means of screws 14, Intermediate the housing and said cover 15 there is provided seat 16. Chambers 2 and 3 are in communication by means of openings 17, 20 which are closable by means of flap valve 18 and 21 respectively.

The ejector functions in the following manner, Pressurized air is fed via inlet port 11 into inlet chamber 1, which creates two jet streams the first one vsa. first set of nozzles 6 and 7 while the second via the second set of nozzles 8, 9 and 10. The jet stream created via nozzles 8, 9 and 10 is of higher presure than the second jet with a ratio of approximately 1:2U. The jet stream creates negative pressure in chamber 2 due to the air which is evacuated from chamber 2 via openings 17 and 23, and the negative pressure in chamber 3 which consequently creates negative pressure in chambers 4 and 5. The negative pressure created within said chamber causes flap valve to open in accordance with the negative pressure created.

In order to increase the evacuation capacity of such device, further sets of nozzles could be mounted within partitions"P", Stili, if even greater evacuation capacity is required, two, three, four or more ejector devices could be connected to each other as illustrated in Figs. 3 to 5.

Fig. 3 illustrates two ejectors connected to each other face to face, while if more than two ejectors are to be connected, a central vacuum flow member 25 is used as can be seen in Fig, 4.

Fig. 5 illustrates by way of example the use of a central member with several ejectors.

It is quite apparent that the simple construction of the device and more so the assembly of a number of modules enable easy maintenance and easy service, if so required.

-I- -

Claims

CLAIMS; 1, A niulti. ejector devi.ce compri.sing a housing having an inlet

for pressure medium and an outlet therefor and an evacuation inlet, the housing is further provided with a plurality of chambers which are divided by partitions in which are axially mounted at least two sets of ejectors, said chambers are in communication with each other by means of one way valves, 2. A multi ejector device as claimed in claim 1, wherein one set of two nozzles comprises one unit and mounted as one unit, 3, A multi ejector device as claimed in claim 1, wherein further sets of axially Mounted ejectors are provided, 4, A multi ejector device as claimed in claim 1, wherein further chambers are provided. 5. A multi ejector device as claimed in claim 1, wherein two such is devices are connected to each other to enlarge the evacuation capacity, 6. A multi ejector device as claimed in any of the claims, wherein a plurality of such devices are connected to each other intermediate a central vacuum member, 7. A multi ejector device with reference to Figures I and 2 of the accompanying drawings. 8. A multi ejector device substantially as herein described with reference to Figure 3 of the accompanying drawings. 9. A multi ejector device substantially as herein described with reference to Figures 4 and 5a, 5b, 5c or 5d of the accompanying drawings.

substantially as herein described