Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition – Control element responds proportionally to a variable signal...
Patent
1989-05-30
1992-03-24
Warden, Robert J.
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
Control element responds proportionally to a variable signal...
422110, 422243, 366 16, 366 19, 366152, 366161, G05D 700
Patent
active
050986660
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention relates to a device for metering at least two fluid reaction components into a mixing chamber with at least one container chamber for each component, with one displacement element in each container chamber, whereby in all the chambers for at least one component the displacement element is flexible which divides the relevant container chamber into a component chamber and a hydraulic chamber and which hermetically seals off the component chamber from the hydraulic chamber, with a feed pipe for each component running from a component reservoir to the component chamber/chambers, and with an outlet pipe for each component running from the component chamber/chambers to the mixing chamber.
A similar device is known from U.S. Pat. No. 4,132,483. This known device consists of one chamber with a bellows for each component, whereby each hydraulic chamber filled with hydraulic fluid is provided with a plunger piston which is sealed off from its surroundings by means of a dynamic seal and whereby the two plunger pistons are mechanically driven by a common, rotatable crossbar.
This known device does not allow freely selectable adjustment of the dosing ratio during the metering process. Although devices with a coupled mechanical drive which allow alteration of the dosing ratio during metering are known, this mechanical adjustment of the dosing ratio is extremely slow and has one great disadvantage. With larger metering chambers and with the high pressure metering of multicomponent systems, the forces which have to be mechanically transmitted are very high, so that the structural outlay increases correspondingly. A further disadvantage lies in the alteration in the position of the individual chambers to one another which does not allow rigid coupling of the chamber casing. However, in the case of high pressure installations, rigid casing of the metering chambers is imperative for technical, economic and also for safety reasons. In addition, the dynamic seal of the plunger pistons, especially in the case of larger diameters and higher pressures, results in substantial friction and an additional risk of leaking. Losses due to leaks, which are unavoidable even with perfect dynamic seals, progressively alter the stroke of the bellows causing their destruction if the leaks are not constantly checked and fed back into the hydraulic chamber by means of a leak feed-back device, so that the volume of fluid contained in the hydraulic chamber remains constant.
The demands of the plastics processing industry for minimisation of production costs and ever higher product quality make the development and application of suitable control, regulation and monitoring systems acutely necessary. In this area, the development of microprocessor technology and suitable data pickup devices has created the essential pre-requisites for precise single stroke piston metering. This type of metering device is described, for example, in European Patent No. 0,003,563, U.S. Pat. No. 3,908,862 and US-AS 4,008,829.
A disadvantage of these singular stroke piston metering devices is that the plunger piston pumps possess dynamic seals which result in progressive wear of the pump and thus lead to uncontrolled leakage and finally to breakdown, especially when abrasive and/or corrosive components are processed. As a result of this, interruptions of the production process and high maintenance inputs are necessary every three to six months in the case of 24 hour operations, depending on the nature of the components.
The task of the present invention consists in designing a device for the metering of at least two fluid reaction components in such a way as to make possible leak-free, abrasion-free and wear-free dosing of highly abrasive and/or corrosive components as well as a precisely preselectable and controllable volumetric hydraulic flow regulation of the individual components.
This task is solved in accordance with the invention by a device of the kind mentioned at the beginning of the application in that in the case of at least one com
REFERENCES:
patent: 4132483 (1979-01-01), Slaats et al.
Collins Laura E.
Purdue David C.
Purdue John C.
Warden Robert J.
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