Pumps – Expansible chamber type – Having pumping chamber pressure responsive distributor
Patent
1996-10-21
1998-07-28
Thorpe, Timothy
Pumps
Expansible chamber type
Having pumping chamber pressure responsive distributor
417566, 417571, 137855, F04B 3910
Patent
active
057855080
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a pump with flap valves accommodated in the pump head and controlled by the flow medium, which in the closed position lie on a valve sealing surface of the pump head, while in the open position they withdraw into a recess of the valve head for the valve opening movement, wherein the valves have one or more valve disks made of rubber or a rubber-like material, in which are located valve flaps circumscribed by openings, particularly of partial ring shape, which are flexibly connected with the remaining valve disk(s) by means of a web, and wherein in each case the valve disk is clamped between pump head elements in the area which circumscribes a valve.
In order to obtain a good self-aspirating behavior and a good volumetric efficiency with such liquid and gas pumps constructed as diaphragm pumps, it is important that the valves execute their opening and closing movement as synchronously or congruently as possible with the diaphragm lifting and lowering motion and consequently attain the longest opening and closing times possible. In diaphragm pumps with flap valves there exists the problem that a pressure impingement occurs in the outer clamping area of the valve disks by the pump head parts on the valve plates located in between, which are made of rubber or a rubber-like material, and that this leads to a material displacement. The displaced material also affects the valve flaps owing to the closeness of the clamping place, since a transmission is possible over the bridge-like coupling web.
The material displacement can lead to an unwanted deformation of the web, and of the valve flap as well. An impairment, however, results from such a deformation of the web or the valve flap in the sense that the opening and closing movement or the opening and closing speed is impeded. A diminution of valve reaction time results from this.
SUMMARY OF THE INVENTION
An object of the present invention is to create a pump with flap valves of the type mentioned at the beginning, whose reaction times are improved, so that the pump can also be used particularly well for high operating speeds. The self-aspirating behavior and the volumetric efficiency should also be improved thereby.
For accomplishing this object it is particularly proposed in accordance with the invention, that at least one opening or break in the valve disk be provided in a connecting area between valve flap, web and outer clamping adjacent to the web, facing away from the valve flap, and that the width of the opening in the direction of the line connecting between valve flap, web and outer clamping appropriately corresponds at least to the size of a material displacement arising from the outer clamping.
Owing to the opening provided, material displacements arising from the clamping area no longer reach the web and through this into the area of the valve flap. A buffer space is practically created by the break or opening, in which material displacements that occur can be diverted without having further effects on the other side.
To be sure, one could also enlarge the distance between the outer clamping and the valve flap or web to reduce the effects of the material displacement which arises. This is, however, not practically possible due to the confined spatial relationships in the pump head.
With the solution of the invention, on the other hand, the effects of the material displacement can be kept practically completely away from the valve flap, while this is also easily possible under the given confined spatial relations. Through the provided width of the recess sufficient free space is thereby created to keep away material shifts or material displacements arising from clamping the valve disks in the direction toward the web and the valve flap.
The opening in the valve disk located in the extension of the valve flap and web preferably extends laterally and preferably symmetrically out past the direct projection extension of the web. The length of the opening preferably corresponds to about 2 to about 8 t
REFERENCES:
patent: 3514231 (1970-05-01), Belden
patent: 4573888 (1986-03-01), Kitchin
KNF Flodos AG
Thorpe Timothy
Tyler Cheryl J.
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