FR2586457A1 - DEVICE FOR CONTROLLING A WATER SUPPLY INSTALLATION - Google Patents

Abstract

1. A control arrangement for a water supply installation comprising : - an air tight and water tight enclosure (12), with an input (8) to be connected to a pump (3) with an electric control circuit (27) by means of a check valve (29), and an outlet (9) to be connected to a user device (5), and which is provided with means (13, 14) for reducing the volume of the enclosure when the pressure which prevails therein decreases, and - a first transducer for energising the electric control circuit (27) of the pump (3) when the volume in the enclosure (12) is reduced to a predetermined value, characterized in that - the check valve (29) cooperates with a second transducer (34, 35) for energising the control circuit (27) of the pump when the check valve (29) is open, the two transducers (20-26, 34, 35) being electrically connected in two parallel branches to the electric control circuit (27) of the pump, and - the first transducer (20-26) is connected to the electrical control circuit (27) of the pump by means of a relay (28) for de-energising its branch after a predetermined time period.

Description

Device for controlling a food installation

in water.

  The present invention relates to devices

  control of a water supply installation.

  There is already known a control device of a water supply installation which comprises a

  enclosure airtight and watertight. In this

  encircles an inlet intended to be connected by a check valve to an electric control circuit pump. Y also opens an outlet intended to be connected to a user device such as a tap, for example, shower. The enclosure is equipped with means to reduce the volume when the pressure therein decreases. (Hydrostat type exponent provides

  by the company EXPO / S in Lillesand Norway).

  This device has the great advantage of removing

  constant pressure variations in the

  installation, unpleasant to the user compared

  the known prior art device with reservoir and contact

  manometer, interposed between the pump and the

binet.

  In more detail, this standard device

  vegan comprises a body in which are delimited a first chamber where the water arrives from the pump by a non-return valve. The pressure in this chamber depends directly on the pressure delivered by the pump. There is a second air chamber. The pre-inflation pressure of this chamber determines the start-up pressure of the pump. Finally, a third bedroom is separated from the second by a

  piston and the first by a valve with an

  floor. At rest, the air pressure of the second

  chamber lowers the piston that separates the

  xth bedroom of the third bedroom. A magnet

  the upper part of the piston releases the con-

  which controls the pump and, when

  the pump starts. The piston in the lower position pushes the valve separating the first chamber from

  the third chamber and communicates these rooms.

  cation. Water from the pump passes through the first

  first chamber and goes to the third chamber through

  towards the open flap. If the tap is closed, the

  pressure increases in the third chamber and pushes

  the piston separating the second chamber from the third chamber. Going up, the piston releases the flap that closes. Water continues to slowly enter the third chamber through the nozzle by pushing back the piston. In the upper position of the piston,

  the magnet opens the contactor and stops the pump. Lors-

  when the tap is turned on, water flows from the third chamber. The air pressure of the second

  chamber pushes the piston. The magnet attached to the pis-

  your down and establishes the power contact of

  the pump that starts. If the flow of the pump is

  less than the flow rate of the valve, the pressure rises in the third chamber and makes the piston is pushed back

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  to the second bedroom. By raising the piston

  The flapper closes and causes the water to pass between the first and third chambers. If the pressure drop at this passage becomes too great, the pressure in the third chamber decreases. The air of the second bedroom pushes

  the piston that will open the valve. There is therefore a balance

  pressure between the second and third chambers

  I sleep like in the whole installation.

  This device can only work in vertical position. In other positions, moving

  of the magnet, obtained by means of springs, is embarrassed.

  This device is complexecar it includes a large number of moving parts. The nozzle can be

  clogged with impurities from water or limestone.

  In case of obstruction of the nozzle, when closing

  tap, the pressure can not increase in the third chamber and push the piston

  cause the pump to stop. To order the cy-

  keys, it is necessary to vary the

  relatively high pressure pressure of 0.6 to

  1.4 bar depending on the pre-inflation pressure of the

  twelfth room. This variation in pressure is related to the stroke of the piston to establish or to cut the contact which controls the pump. The major disadvantage however is that if the valve is open, the pump starts and continues to operate, even if it does not flow (for example because there is no water in the well, because the pump is defused,

  because a pipe is blocked, etc ...). This function

  with no flow or no water leads to destruction

  fast pump. And even if we close

  binet in such a case of operation, as the pump no longer provides flow, the pressure in the third chamber can not rise and control the stop of the

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  pump. The device according to the invention overcomes the aforementioned disadvantages by allowing operation in a position other than vertical, while having few moving parts. Any danger of clogging a nozzle is removed. The pressure variation that is required to control the cycles of setting

  pump start and stop is much less than

  afterwards, which makes it possible to use pom-

  whose characteristic is relatively flat (curve of variation of the height as a function of

  debit). Last but not least, the device following the in-

  vention provides unparalleled safety compared to the previous device when the pump operates without debiting by the fact that in this case the pump stops

  to operate soon after the incident.

  The control device according to the invention,

  is characterized in that the non-return valve co-

  father with a second transducer intended to bring under

  voltage the pump circuit when the check valve

  back is open, the two transducers being connected

  electrically two branches in parallel on the electrical control circuit of the pump and

  the first transducer is connected to the electrical circuit

  pump control unit by means of a relay which de-energises its connection

prescribed period.

  As soon as an incident occurs while the pump is running, the check valve closes and

  this even the control circuit of the internal pump

  breaks the operation of the latter since both the first and the second transducers are then de-energized. In the attached drawings, given solely for the purpose of

For example:

  FIG. 1 is a diagram of an installation according to the invention. FIG. 2 is a sectional view of the control device of a water supply installation according to the invention before it has been connected to a pump. and a user device, and Figures 3 to 8 are views of this device

  illustrating the various stages of operation.

  The installation shown in FIG. 1 comprises a well 1 of water communicating via a conduit 2 with the admission of a pump 3. The discharge of the pump

  communicates via a conduit 4 with a tap 5, a disc

  according to the invention being mounted on this

duit 4.

  The device according to the invention is shown in Figure 2. It comprises a body 7 of plastic material airtight and water. This body is provided with an inlet 8 intended to be connected to the pump 3 and an outlet 9 intended to be connected

  5. The inside of the body is subdivided by a partition

  its 10 in a compartment 11 to house the circuits

  and in an enclosure 12 in which

  close the entry and exit 8 and 9. A membrane that

  could be elastic in which elasticity

  which could be conferred by a spring and which, in this case, receives its elasticity by an air chamber 14, extends into the enclosure on the basis of a

  cup 15 provided with two orifices 16 and 17.

  In addition, around the orifice 17, the shovel is provided with a sleeve 18. In order to inflate the compartment 14 by introducing air into it, a valve is provided.

pre-inflation 19.

  A rod 20 is pushed back by the membrane 13 into

  being guided by the sleeve. She enters by her ex-

  opposite end in a housing formed by a sleeve 21 integrally molded with the wall 10. In a position

  intermediate rod 20, is formed a glue-

  22 on which the end of a

  23 helicoidal fate whose other end is based on an inner shoulder 24 of the sleeve 21. In the end of the rod 20 opposite the membrane 13,

  two magnets 25 are recessed.

  when the rod 20 is fully depressed

  mum in the sleeve 21, there is a Hall effect cell 26 welded to a printed circuit 27 constituting the control circuit of the pump 3. The cell 26 is connected to the printed circuit 27 by means of a relay 28 putting out of tension of the branch of the circuit on which the cell 26 is mounted after a prescribed period, in this case of 6 seconds. The membrane 13 and the compartment 14 are means for decreasing the volume of the chamber 12 when the pressure therein decreases. The set of parts 20 to 26 constitutes a first transducer intended to power up the electrical control circuit of the pump when the volume of the enclosure has decreased to a given value, in this case when the membrane 13

  is closely applied to the cup 15.

  On the mouth of the inlet 8 in the chamber 12, is mounted a non-return valve 29 comprising a disc 30 and a pusher 31 whose free end is housed in a cavity of the sleeve 21 for guiding purposes. Between the sleeve 21 and the valve 30 is mounted around the rod 31, a helical spring 32 return. Around the disc 30 protrudes

  an excrescence 33 carrying two magnets 34. A proxi-

  1 of these magnets 34 and on the other side of the wall - is a Hall-effect lamp 35, whose tabs 36 forming connection branches are soldered to the printed circuit 27 serving as a control circuit

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  of the pump 3. A light indicator 37 makes it possible to see if the circuit 27 is under tension. A light indicator 38 makes it possible to see if the Hall effect cell 26 is energized. An indicator light 39 makes it possible to see if the Hall effect cell 35 is energized. A push button 40 with power button allows the circuit 27 to be powered from the outside independently.

  of the connection of cells 26 and 35.

  The control device according to the invention

works in the following way.

  In Figure 3, the pump 3 does not work and the valve 5 is closed. The non-return valve 29 is applied to its seat. The rod 20 is in position

  low, which means that the magnets 25 are

  cell 26. The membrane 13 is not suitable for

  the cup 15 so that the volume of the chamber 12 is relatively large. The water therein is under a pressure of 3 bar, the pressure of the compartment 14 being of course also

3 bar.

  In FIG. 4, the valve 5 has been opened.

  pressure in the chamber 12 decreases to 1 bar.

  The membrane 13 tends to be applied against the cup

  by reducing the volume of the enclosure 12. The pressure

  in the compartment 14 returns to 1 barj which is the pre-inflation pressure obtained by the valve 19, water passing from the space between the membrane

  13 and the cup 15 in the chamber 12 through the hole 16.

  The membrane 13 pushes the rod 20 against the spring 23. The magnets 25 are opposite the cell 26 and excite. The cell 26 controls via the relay 28 the electrical circuit 27

  control of the pump. Pump 3 works.

  In Figure 5, the pump started to flow.

  Under the effect of the pressure supplied by the pump 3, the

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  valve 29 moves away from its seat by pushing the res-

  32. The magnets 34 come opposite the cell

  lule 35 and excite her. This in turn controls the electric circuit 27 in parallel with the cell 26. Immediately, the pressure in the chamber 12 rises to 2 bar depending on the opening of the valve 5. FIG. normal operation of the installation. As the pressure in the chamber 12 is 2 bar, the membrane 13 has moved away from the cup 15, and the rod 20 is no longer pushed by the membrane, the spring 23 pushes back

  the flange 22 on the edge of the sleeve 18. The

  mants 25 move away from cell 26 and de-energize it

  tent. The control circuit 27 of the motor remains

  while under tension due to the cooperation of the magnets 34 and the cell 35, the spacing of the magnets 34 from the cell 35 causing it to turn the circuit 27 under tension while the magnets 34 are facing the cell 35 when the check valve 29 is applied to its seat, the

  cell stops powering circuit 27.

  In FIG. 7, the valve 5 has been closed.

  in the chamber 12 goes back to 3 bar. The nonreturn valve 29 is applied again on its seat under the action of the spring 32, since the pressure of

  and other of the flapper is the same. The magnets 34 come

  Again, in front of the cell 35, it switches off the circuit 27. Pump 3 stops. We find the position of Figure 3 and the device

  is ready to cycle again.

  In Figure 8, it is assumed that one is, as in Figure 4, at the start of the pump but that it, for some reason, does not flow. The pressure in the chamber 12 remains at 1

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  bar instead of going up to 2 bar. The valve 29 remains closed since the pump 3 does not flow. After

  6 seconds, cell 26 stops because of the

  relay 28, to put circuit 27 under

  if we. The pump therefore stops running empty. Some time later, it is assumed that the pump is re-supplied with water or that the fault has been repaired. By the push button 40 and the button

  of aquit 41, the circuit 27 is turned on. The pom-

  pe 3 works and debits. The check valve 29 opens. We are in the position of Figure 5. Of course, instead of Hall effect cells could also be used switches to

  soft blades or other transducer elements

  able to open or close an electrical circuit

  response to the detection of a displacement.

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Claims (4)

  1 - Control device for a water supply installation, comprising: - an enclosure (12) sealed to air and water, into which an inlet (8) intended to be connected to a pump ( 3) by a non-return valve (29) with an electric control circuit (27) and an outlet (9) intended to be connected to a user device (5), and which has means (13, 14) for decreasing it. the volume when the pressure therein decreases, - a first transducer for energizing the electric control circuit (27) of the pump (3) when the volume of the enclosure (12) has decreased to a value data, characterized in that: - the nonreturn valve (29) cooperates with a second transducer (34, 35) for energizing the control circuit (27) of the pump when   the non-return valve (29) is open, the two trans-   drivers (20 to 26, 34, 35) being connected   two branches in parallel on the electric control circuit (27) of the pump, and _ - the first transducer (20 to 26) is connected to the control circuit (27) of the pump via a relay (28). ) off of his branch   connection after a prescribed period.   2 - Device according to claim 1,   characterized in that the means for increasing the volume are constituted by an elastic membrane   (13) forming one of the walls of the enclosure.   3 - Device according to claim 1 or 2, characterized in that the first transducer comprises a rod (20) pushed by the volume reduction means (13, 14) and carrying a position detector element (25) conjugated with a first cell to Hall effect (26).   4 - Device according to claim 1, 2 or   3, characterized in that the second transducer comprises   takes a second position sensing element (34) carried by the non-return valve (29) and conjugated   a second Hall effect cell (35).   Device according to Claim 3 or 4, characterized in that the position detectors are magnets.