Twin filter for compressed air

Fluid handling – With means for separating solid material from the fluid – Hollow strainer – fluid inlet and outlet perpendicular to...

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Details

1375991, 210136, B01D 3512

Patent

active

059506725

DESCRIPTION:

BRIEF SUMMARY
The object of the invention is a twin filter for compressed air, in which there are two filters set in parallel and a set of valves for directing the compressed air through the selected filter, the set of valves including inlet valves to distribute the compressed air from the inlet to the selected filter and an arrangement of counter valves to direct the compressed air from the selected filter to the compressed air outlet, which arrangement of counter valves consists of two counter valves that are set opposite one another and are connected to one another by a chamber, to which valves are connected inlet connections and an outlet connection, and in which a ball is arranged to close the unpressurized inlet connection. The invention is also concerned with an arrangement of counter valves for other purposes.
Modern compressed air filters use synthetic cylindrical pipes, elements, which are set into the water-removal cup, when the compressed air filter can also separate water, in addition to filtering. Filter elements of this type are made by several manufacturers, among them the American company Numatics, Mich. Such filter elements are made with different grades of coarseness, so that it is possible to speak of, for example, a 5 .mu. element. This means that such an element will not permit particles with a diameter greater than 5 .mu. to pass through it. The element filter must be changed now and then, when the pressure loss across it becomes too great to use. The flow through the filter must then be cut. Twin filters are therefore used for uninterrupted air distribution, these having two filters set in parallel in such a way that, with the aid of a suitable arrangement of valves, the flow can be switched from one side to the other. A blocked filter can then be changed at the same time as the flow continues unbroken through the other filter.
In one known twin filter, there is a T-piece, after which there are various shut-off valves, by means of which the flow can be manually opened to the desired side and correspondingly shut off from the other side. There is a danger that the operator may close both shut-off valves. On one side of the filters two spring-loaded counter-valves are used, in both of which a ball moves in a pressure chamber formed by a drilled hole, both chambers being connected to the other by a connecting drilled hole. Channels are led from the filter to the ends of the ball chamber while the flow exits from the middle of the connecting hole. The spring then closes the opposite counter-valve, shutting the valve that has been cut off. However, a counter-valve arrangement of this kind limits the flow.
This invention is intended to create a new kind of twin filter for compressed air, which has new characteristics compared to known twin filters, while also making the operation of a twin filter easier, without the risk of operating errors.
The characteristic features of a twin filter for compressed air according to the invention are described in the accompanying claims. It is most advantageous, if the cage structure that carries the ball is formed by a filter element that is as such known, but mechanical structures are also possible in principle. A filter element can be used to create a suitable pressure loss, which will drive the ball reliably to the other end.
A twin filter according to the invention together with a filter element used in the ball chamber also provides the additional advantage that, if filter elements run out, for a short period there is still the pressure chamber coarse filter left after the filter proper, which is in any event preferable to a break in operation or a total lack of any filter. Other advantages and embodiments of the invention appear later.
In what follows, the invention is illustrated by reference to the accompanying Figures, which show one twin filter for compressed air in accordance with the invention.
FIG. 1 shows the flow diagram for a twin filter for compressed air according to the invention.
FIG. 2 shows front view of a compressed air filter according to the

REFERENCES:
patent: 1253344 (1918-01-01), Braun
patent: 2466304 (1949-04-01), Cooney
patent: 2566609 (1951-09-01), Grosse
patent: 3051188 (1962-08-01), Tilney
patent: 3951802 (1976-04-01), Derouinear
patent: 4003397 (1977-01-01), Cooper

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