Classifications

• • G—PHYSICS
  • G05—CONTROLLING; REGULATING
  • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
  • G05D7/00—Control of flow
  • G05D7/01—Control of flow without auxiliary power
  • G05D7/0193—Control of flow without auxiliary power using hydraulic or pneumatic amplifiers, relays or transmitters

Definitions

• the present invention relates to a method and a device for regulating the flow of fluid in a fluid distribution network comprising one or more circuits, each having an inlet and an outlet.
• the object of the invention is to carry out an automatic adjustment of the flow rate of the fluid, so that its increase or decrease varies as a function of the pressure difference existing between the upstream (inlet) and the downstream (outlet) of the circuit.
• the flow regulation device targeted by the invention comprises, between the inlet and the outlet, automatic self-regulation means adapted to maintain constant the difference in fluid pressure between the inlet and the outlet, at a predetermined set value.
• the self-regulating means comprise, placed on a fluid conduit, between the inlet and the outlet, a movable adjustment member making it possible to create a variable pressure loss, and means for adjusting this pressure loss to the set value, cooperating with said adjusting member by means of a first enclosure opening onto the movable adjusting member and capable of being placed in communication, either with the outlet or with the fluid inlet, as a function of the actual value * of the pressure difference between the inlet and the outlet with respect to the set value.
• Figure 1 is a schematic view of a first embodiment of the device for regulating the flow of a fluid according to the invention.
• Figure 2 is a partial elevational view of a second embodiment of the device covered by one invention.
• the device shown in Fig.l constitutes a fluid circuit that can be part of a distribution network comprising a set of such circuits, for example central heating.
• This circuit comprises a main conduit 1 in which the fluid circulates in the direction indicated by the arrows FI and F2.
• This device comprises, placed on the conduit 1 between an inlet A and an outlet B of fluid, a movable adjustment member 2 constituted by a flexible membrane 3 equipped with a needle 4.
• the flexible membrane 3 is fixed internally to a tubular part 5 opening into the pipe 1 between the inlet A and the outlet B, the post 4 being positioned opposite a constriction 6 formed in an internal partition 7 of the pipe 1.
• the needle 4 and the throttle 6 are dimensioned so that the latter can be closed partially or completely by the needle 4, pushed by the membrane 3, if the pressure exerted on the face of the latter opposite the needle 4 is sufficient.
• the tubular part 5 delimits a first enclosure 8 closed on one side by the membrane 3 and on the other by a bottom 9, and which communicates by a pipe 11 with the conduit 1 at the level of the fluid outlet B.
• the first enclosure 8 is extended by a second enclosure 12, with which it communicates by a constricted passage 13 forming a leak orifice, traversed by a rod 14.
• One end of the latter is fixed to a flexible membrane 15 the periphery of which is itself internally fixed to the wall of the second enclosure 12.
• the latter is thus divided into a first compartment 12a, containing a part of the rod 14, and a second compartment 12b, containing an elastic member 16 for calibrating the difference in fluid pressure between the inlet A and the outlet B.
• This elastic member may for example be as shown , a helical spring 16 compressed between the flexible membrane 15 and a screw 17 for adjustment, crossing the bottom of the compar ⁇ timent 12b.
• the end of the rod 14 opposite the membrane 15 carries a needle 18 capable of closing the inlet of the bypass formed by the pipe 11, when the pressure in the compartment 12b is sufficient.
• the rod 14 carries a second needle 19, positioned opposite the passage 13 so as to be able to close it when the pressure in the enclosure 8 is sufficient, the needle 18 then being moved away from the inlet of the canalization 11 thus put in communication with the enclosure 8.
• the second compartment 12b in which the calibration spring 16 is placed, communicates by a pipe 21 with the conduit 1 at the outlet B of fluid, while the first compartment 12a of the enclosure 12 communicates by a pipe 22 with fluid inlet A.
• a and the outlet B is fixed by the calibration of the spring 16 by means of the screw 17.
• This screw can optionally be removed, if the spring 16 is provided tared cons- truction, at a fixed value.
• the pressure difference between A and B can be considered equal to the calibration value of the spring 16.
• the pressure tap at A is then transmitted to the compartment 12a of the enclosure 12, and this pressure compresses the membrane 15.
• the pressure at the outlet B, lower than the pressure at A, is transmitted to the first compartment 12b of the enclosure 12 by the pipe 21, and presses on the other face of the membrane 15.
• the pressure in the compartment 12b thus comes, thanks to the complement provided by the pressure of the spring 16, the pressure A prevails in the compartment 12a.
• the end needle 18 of the guide rod 14 secured to the membrane closes the inlet orifice of the pipe 11.
• the pressure A and B increases, the pressure A will become greater than the sum of the pressures at B and the spring 16, so that the membrane 15 will move in the direction which prime the spring 16.
• This compression has the effect of moving the fluid rod 14 in the direction which moves the needle 18 away from the inlet of the pipe 11 thus placed in communication with the enclosure 8, while the needle 19 closes the leak orifice 13.
• the pressure in the enclosure 8 becomes equal to the pressure at the outlet B, which releases the membrane 3 which returns from its position 3a close to the constriction 6 towards its position 3, while correspondingly the post 4 returns from its position 4a in which it closes the throttle 6, to its position 4 in which it releases the throttle 6.
• This opening of the throttle 6 allows the circulation of the fluid through the regulating member 2 which reduces the pressure difference between A and B.
• the pressure difference has again reached its set point, determined by the calibration of the res ⁇ 16
• the device is again positioned in equi ⁇ free and does not pass, through the throttle 6, that the amount of fluid required to maintain thisequili ⁇ bre.
• a and B is however limited to a value equal to the pressure drop of the regulating member 2 wide open, and for the maximum fluid flow rate, corresponding to the pressure drop value.
• the device according to the invention can be used as a progressive discharge valve at the foot of heating columns, as a progressive pump discharge valve or as a by-pass valve ("by-pass"). cooked regulated, this list is not exhaustive. It will be noted that this device operates without the addition of external energy, thanks to the energy of the regulated fluid.
• the membrane 3 no longer carries a needle and directly closes a tubular part 23, soli ⁇ dary of the edge of the constriction 6 and appr ⁇ required length.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Automation & Control Theory (AREA)
• Infusion, Injection, And Reservoir Apparatuses (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9411948

Family Applications (1)

Country Status (4)

Families Citing this family (2)

Family Cites Families (6)

• 1991
  • 1991-04-17 FR FR9104726A patent/FR2675598A1/fr not_active Withdrawn
• 1992
  • 1992-04-15 AU AU16910/92A patent/AU1691092A/en not_active Abandoned
  • 1992-04-15 WO PCT/FR1992/000340 patent/WO1992018921A1/fr not_active Ceased
  • 1992-04-15 EP EP92910175A patent/EP0580731A1/de not_active Withdrawn

Non-Patent Citations (1)

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