Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1987-09-10
1989-08-29
Cohan, Alan
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
137 82, 25112908, G05D 1600
Patent
active
048607878
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a fluid pressure regulator with integrated sensor.
In all devices using the pressure of a fluid in a hydraulic circuit, it is generally necessary to constantly and very accurately detect, regulate and adjust said fluid pressure.
This is the case more particularly with printers using a continuous jet of ink drops, these drops having to be fed at a constant and very precise pressure to the modulation body towards a calibrated nozzle.
Generally, the control and servo control systems, and particularly the sensor, are separated from the pressure regulation units and so are voluminous with pipes and risks of pressure drops and leaks.
Moreover, sealing of the regulation units themselves is often provided by a bellows or by a radial seal placed on the piston.
These solutions are not compatible with their use in ink jet printers. The ink is not a lubricant and has the disadvantage of drying, which causes the piston to stick during the times when the device is not used.
In general, existing devices do not allow a sufficiently fine pressure regulation to be obtained in use, especially with nominal low pressures, for satisfying certain applications.
This is more particularly the case of ink pressures used in ink jet printers.
The purpose of the invention is to overcome these drawbacks and corresponds to the above mentioned requirements.
It relates more precisely to a pressure regulator and sensor associated with a pressure reducer programmable by means of a stepper motor.
Such a device is characterized in that, since it is monolithic, it includes in a single block, the fluid flow section combining the regulator and the sensor and which another block is associated formed by the control system.
Although integrally secured to the first one, this latter block is completely isolated from the fluid part.
The invention will be better understood from the following explanations and the accompanying FIGURE which shows an elevational section of the device of the invention.
In this FIG. 1, the device is shown in the state for obtaining the minimum operating pressure.
Section 1 which will be called hereafter the "fluid section", is formed by a body 11 having an inlet for the fluid E, a channel C, extending this latter and a fluid outlet S.
From inlet E to outlet S channel C has continually flowing therethrough the fluid ff which is collected at the outlet S at an operating pressure pu which must be perfectly precise and regulated.
This body 11 is also formed vertically and centrally with a bore 20 opening into the channel C of the operating fluid.
In this bore is freely movable a pusher 8 bearing on a spring 9 itself acting on a valve 10 adapted for completely closing bore 20 or not.
This cylinder 20 is in direct communication with a return path Vr extended by an external connection Rr.
With the top of this "fluid section" 1 is associated a pressure sensing cell 12 which provides permanent reading of the user pressure obtained pu.
As the base of this "fluid section" 1, a "dry section" 2 is formed of a body 4 in which is mounted a free sliding spool 7 which cooperates with a pusher 8 for acting on the members of the "fluid section" 1 under the action of a screw 5 driven by a stepper motor 6.
For providing sealing of the device, a flexible membrane 3 is inserted between the "fluid section" 1 and the "dry section" 2.
It is through this membrane 3 that spool 7 bears on pusher 8. It thus follows the deformations which are imposed on it by the up and down movements of spool 7 and pusher 8.
Considering the position of membrane 3 in FIG. 1, it should be recalled that the device is in the state for obtaining the minimum operating pressure pu.
A manual redundance for controlling screw 5 by means of wheel 55 is provided should the stepper motor 6 itself fail, or in the case of a programmable servo control system.
According to an important feature of the invention, the fine adjustment of the operating pressure pu of the fluid ff flowing through channel C is obtained through an external automatic device 60 which acts o
REFERENCES:
patent: 2614583 (1952-10-01), Di Maggio
patent: 2960097 (1960-11-01), Scheffler
patent: 3283769 (1966-11-01), De Meo
patent: 3482588 (1969-12-01), Kreuter
patent: 3799498 (1974-03-01), Wickham
patent: 4512357 (1985-04-01), Earl
patent: 4550747 (1985-11-01), Woodworth
Cohan Alan
Imaje S.A.
Plottel Roland
LandOfFree
Pressure regulator with integrated sensor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pressure regulator with integrated sensor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pressure regulator with integrated sensor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2231802