Pumps – One fluid pumped by contact or entrainment with another – Jet
Utility Patent
1999-04-27
2001-01-02
Fox, John (Department: 3753)
Pumps
One fluid pumped by contact or entrainment with another
Jet
C417S186000
Utility Patent
active
06168386
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the invention
The present invention concerns a device for injecting a liquid in a compressed gas, which device contains a reservoir for the liquid, sealed by means of a cover which is provided with a passage for the gas in which opens a liquid channel which is connected to the reservoir, whereby the passage forms or contains a jet pipe in the vacuous part from where the liquid channel discharges.
When gas under pressure flows through the passage, an a suction is created in the jet pipe, i.e. a narrowing/widening tube, also called venturi tube, where the constriction or throat is situated, so that liquid is sucked out of the cistern via the liquid channel and injected in the gas.
The passage is connected to a source of gas under pressure with its inlet and it is connected to at least two pipes with its outlet, for example via a nozzle having at least two branches which can usually all be shut off by means of a closure valve.
When driving pneumatic machines, it is usually advisable to add lubricating oil to the compressed air. That is why devices of the above-mentioned type, known as line lubricators, are placed between the compressed air receiver and a nozzle into which the various compressed air lines are connected.
2. Discussion of the Related Art
In the known line lubricators, compressed air in which oil has been injected is supplied via each of the branches.
In some cases, in particular when there are three branches, it may be advisable that the compressed air in one branch does not contain any lubricant.
In the known line lubricators, this is solved by means of a by-pass bridging the head, which makes the construction complicated and expensive.
SUMMARY OF THE INVENTION
The present invention aims a device for injecting liquid in a compressed gas which avoids the above-mentioned disadvantage and which has a relatively simple construction, but which can nevertheless supply gas both with and without any injected liquid.
This aim is realized according to the invention in that the passage, seen in the flow direction, is divided in two separate gas channels by means of a wall, from before the place where the liquid enters the passage up to the end of the passage, such that the liquid only enters in one of the two gas channels.
When a nozzle with two or more branches, either or not equipped with a closure valve, is connected to the end of the passage situated downstream, one or more branches are connected to one of the gas channels from which flows gas without liquid, whereas the other branches are connected to the other gas channel from which flows gas with injected liquid.
The above-mentioned wall can be entirely or partly fixed to a nozzle which is mounted on the head and which is provided with couplings for connecting the pipes with gas under pressure and possibly also closure valves, but said wall is preferably fixed directly to the head itself.
The wall may form a tube at least at the end of the passage, which is preferably coaxial to the passage, whereby the one gas channel, preferably the gas channel for gas without liquid, is then limited by this tube.
A part of the passage itself may form the above-mentioned tube, in which case the liquid channel can open directly in the passage.
However, the above-mentioned jet pipe may also be erected inside the passage, in which case the liquid channel opens in the vacuous part of this internal jet pipe and the liquid enters the passage via said jet pipe.
In the latter case, the place where the liquid enters the passage is the outlet of the internal jet pipe, and the wall extends in the flow direction from before this outlet of this jet pipe up to the end of the passage.
With an internal jet pipe, the head can be provided with what is called a double jet pipe, whereby a part of the passage thus forms a part of a first jet pipe and the internal jet pipe forms a second one which is erected inside the first one and which is usually coaxial to the first one. Such a double nozzle pipe allows for a larger discharge head of the liquid.
Especially in these cases with an internal jet pipe, it is unusual to provide a wall in the passage, since the internal jet pipe on first thoughts seems to obstruct such a jet pipe.
However, it was found that this was possible by providing the beginning of the wall next to the internal jet pipe.
This wall may for example consist of a plate-shaped part which begins between the bent side of the passage and the internal jet pipe and which continues along this side and is transformed in a tube-forming part via a transition part, whereby the space between this plate-shaped part and the side of the passage on the one hand, and the inside of the tube-forming part on the other hand are part of one of the gas channels.
REFERENCES:
patent: 4131658 (1978-12-01), Hirata et al.
patent: 4395201 (1983-07-01), Bron
patent: 4476827 (1984-10-01), Basaglia et al.
patent: 1808849 (1970-07-01), None
patent: 195 19 885 A1 (1996-12-01), None
patent: 440682 (1936-01-01), None
patent: 1338378 (1973-11-01), None
Atlas Copco Airpower, Naamloze vennootschap
Bacon & Thomas PLLC
Fox John
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