FR2565811A1 - Shower apparatus with water recirculation and temperature adjustment, as well as process involved in using this apparatus - Google Patents

Abstract

a. Shower apparatus with water recirculation and temperature adjustment, as well as process involved in using this apparatus. b. Apparatus characterised in that the shower cubicle A comprises members, in particular a screen 10, permitting the orientation of the spraying rail 6 between a position for use and a position for preparation in which the water sprayed cannot reach the user either directly or via splashes. c. The invention applies to shower apparatuses.

Description

Water recirculating shower mixer with adjustable
temperature, as well as the method used for the uti
using this device
The present invention relates to a shower apparatus with water circulation and temperature control.

 Such an apparatus allows the user to have an abundant jet, powerful, permanent, filtered, temperature exactly chosen, without exceeding the usual capabilities of domestic hot water sanitary installations, whether instantaneous flow rates as in the case of gas-fired water heaters or available quantities as in the case of different types of storage water heaters.

 Beyond its obvious ability to provide the services normally expected of an individual diaper, this is a true hydrotherapy device that can fit seamlessly into any room or bathroom having a sink with hot and cold water.

 An apparatus of this type is characterized in that it comprises a sleeping cabin provided with a shower tray and a shower head or a water spray bar, as well as a recirculation circuit and regulation capable of recovering the water dropped into the shower tray for reintroduction into the shower enclosure by the spray bar under predetermined conditions of temperature and pressure, the recirculation and regulation circuit consisting of a main pipe constituted by a water inlet pipe connected to the spray boom and a return pipe comprising a circulation pump capable of recovering the water that has fallen into the shower tray and reintroducing it into the inlet water pipe , secondary pipes that can introduce hot and / or cold water from external networks in the main pipe to which they are connected via valves of co mmande, the secondary hot water introduction pipe subdivided in its downstream part into two pipes each connected to a control valve and capable of supplying hot water in the main pipe at different flow rates, as well as a drain line connected to the main pipe via at least one switching valve.

 The object of the present invention is to improve the characteristics of the apparatus described above, in particular by adding additional hygiene concerns and by increasing its safety.

 For this purpose, the present invention relates to an apparatus of the type described above, characterized in that the shower enclosure comprises organs, in particular a screen allowing the orientation of the rample of pul serization, between a position of use and a preparation position in which the water spray can not reach the user either directly or by splashing, and in that the secondary pipes for introducing hot or cold water with high flow rates comprise a safety solenoid valve whose the opening and closing are controlled from safety means so as to allow the introduction of a high flow of hot or cold water into the main pipe only when the spray boom is in the pre-ration position .

 This arrangement completely eliminates the risk of burns or excessive cooling when the ramp is in the preparation position, since the user can not be in contact with possibly too hot or too cold water from either the spray boom, or the bottom of the tank from which it is separated by a slatted floor.

 According to another characteristic of the invention, the safety means consist of a safety pressure contact associated with a control damper for controlling the opening of the safety solenoid valve when it is subjected to pressure, of the safety network. city water delivered by a safety push-button valve automatically actuated by the spray boom in the preparation position.

 Control registers are understood to mean any automatic device capable of achieving logical matches between states and actions. Such a device may consist of an electromagnetic or static relay or a printed circuit.

a microprocessor.

 According to a preferred feature of the insention, the spray boom is simply movable about a vertical axis, and its rotation is caused by a lever integral with this ramp, which automatically exerts pressure on the push valve in the preparation position, to come to solicit manometric safety contact.

 According to another characteristic of the invention, the pressurization of the safety pressure contact causes the start of the circulation pump with a delay determined with respect to the opening of the safety solenoid valve.

 During this delay which is usually of the order of 10 to 15 seconds, which represents the time required for heating the constituent materials of the installation and the humidification of the air contained in the cabin, only water hot is introduced.

 The circulation pump is preferably associated with a holding pressure contact connected to the control register and being able to be biased by the pressure established by the pump to maintain the power supply of this drive motor.

 At the start of the pump, the flow of water is established in the equipment, and it remains only to adjust exactly its temperature.

 For this purpose, and according to another characteristic of the invention, the shower enclosure comprises a progressive remote control button allowing the user to vary the temperature of the water supplied by the spray boom by controlling the closure or the total or partial opening of the control valves provided on the secondary lines.

 As soon as the right temperature is obtained.

 The user therefore only has to rotate the pulser ramp to the position of use. In doing so, it releases the safety push button, which causes the closure of 1 safety solenoid valve and prohibits the introduction of a high flow of hot or cold water in the circuit. I1 maintains the temperature by means of the small flow hot water valve.

 According to another characteristic of the invention, there is provided a safety thermostat capable of controlling the stopping of the circulation pump and consequently the interruption of the supply of water to the spray bar, when the temperature of the water exceeds a predetermined TO value.

 This feature avoids any risk of burn when the ramp is in the position of use.

 According to another characteristic of the invention, the shower enclosure comprises a drain control push-button valve that can be operated by the user at the end of the operation to transmit the pressure of the network to a manometric drain contact associated with the damper control and trigger in return the actuation of the or valves and referral of the flow of water to the drain line.

The emptying point can be located in
elevation. It may, for example, be constituted by a
siphon washing machine, sink, tub. etc ...

To avoid the introduction of any impunity
retained in the water in circulation, the main pipe is
equipped with a filter. To allow easy cleaning of
this filter, it is actually, expected, according to another character
of the invention, two switching valves placed
on both sides of this filter which is crossed by water
in circulation in a first sense in use,
and in a second sense opposite to the first being
drain. This cleaning of the filter is, in fact, carried out
during the subsequent rinsing operation, which, consistent
another characteristic of the invention, is
triggered by a flush control knob susceptible
to be maneuvered by the user to operate
control means for a rinsing operation of the apparatus
corresponding to a circulation of cold water in
the main pipe.

To make this rinse more efficient. the
control means of the rinsing operation comprise
an electro-flushing valve whose opening causes
the introduction into the circuit of a dose of a bactericidal product initially contained in a tray.

According to another characteristic of the invention, the control valve of the pipe
secondary cold water inlet and the valve
control of the high-flow hot water supply secondary pipe, are constituted by the same three-way valve, high-flow hot water being used
when setting the temperature of the apparatus while
cold water is used during rinsing.

According to another variant of the invention,
the secondary water supply pipe
cold is connected to the main pipe upstream of
traffic pump and secondary intro driving
duction of hot water is directed to the shower stall
where it feeds the shower tray, either directly or
by a dispersion ramp arranged in such a way that
hot water can not reach the user either directly or by splashing.

In this case and according to another characteristic of the invention, the apparatus comprises a
electric heater arranged on the main pipe
and likely to maintain the temperature in
course of use
The power of this electric heater
must be sufficient to compensate for the losses of the
shower cabin, air exchange included, and cir
cooked outside the cabin. The power is controlled by
the power supply either in all or nothing, or
progressive way by means for example of a thyristor.

The characteristics of the apparatus which is the subject of the invention will be described more in
detail with reference to the accompanying drawings in which
FIG. 1 is a schematic view of
the apparatus,
FIG. 2 is a partial sectional view of this apparatus along the axis aa,
FIG. 3 represents a variant of the apparatus shown in FIG.

According to the figures, the shower unit has a shower cabin A, equipped with a shower tray
C and a water spray boom 6, as well as a recirculation and regulation circuit 1, 2, capable of recovering the water dropped into the shower tray C to reintroduce it into the shower enclosure A by the spray bar 6 under predetermined conditions of temperature and pressure.

 The area of the cabin A where the user is located is separated from the bottom of the shower tray C by a skeletal floor D.

 In addition, the spray boom 6 is movable about a vertical axis x-x 'through a rotating joint 7. Its rotation is caused by a handle 8 integral with the ramp 6, which can be actuated by the user.

 By acting on this handle, the user is likely to bring the spray bar 6 from a position of use to a preparation position in which the water spray can reach the user neither directly nor by splashing. This isolation of the user in the adjustment position is enabled by a screen 10 which defines an area where the water jet can develop without risk of projection on the user. The screen 10 is pierced with a hole allowing the passage of a rod 80 connected to the lever 6. This rod, visible in Figure 2, acts on the push valve 9.

 According to the invention, the ramp 6 may be arranged to dispense a soft or energetic spray, said perse or concentrated, stable or pulsating.

 Furthermore, the recirculation and regulation circuit consists of a main pipe constituted by a water inlet pipe 1, connected to the spray bar 6 and a return pipe 2 comprising a circulation pump. 3 which is able to recover the water dropped in the shower tray C, to reintroduce it into the inlet water pipe 1.

 Secondary pipes 4 and 5 are also provided, which are capable respectively of introducing hot water and cold water from external networks into the main pipe to which they are connected via control valves. 19 and 20.

 The secondary hot water introduction pipe 4 is subdivided, in its downstream part, into two pipes 40, 41 each connected to a control valve 20, 19 and capable of supplying hot water in the main pipe 1, 2 at different rates.

 For reasons which will be described in more detail in the remainder of this description, the control valve 20 of the cold water supply secondary pipe 5 and the control valve 20 of the secondary pipe 40 for introducing water high flow rate are constituted by the same three-way valve.

 In addition, to allow the emptying of the apparatus, there is provided a drain line 32 comprising a drain member 33 and connected to the main pipe 1, 2 via switching valves 30, 31, between which in the main pipe, a filter 26 is provided.

 The pressure of the cold water network is communicated by a small diameter pipe 11 upstream of the various remote control members 9, 22 and 27.

 In order to prevent any risk of burns or excessive cooling of the user, the confluence of the high-flow hot water introduction lines 40 and cold water 5 comprises a safety solenoid valve 15 whose opening and closing are controlled from safety means so as to allow a introduction of a large flow of hot or cold water in the main pipe 1, 2 when the spray bar 6 is in the preparation position.

 These safety means are constituted by a safety pressure contact 13 which is associated with a control register B for controlling the opening of the safety solenoid valve 15 when it is subjected to the pressure of the network, as well as by a safety push-button valve 9 which is automatically actuated by the rod 80 of the handle 8 of the spray bar 6, when the latter is in the preparation position for transmitting the pressure of the network to the safety pressure contact 13.

 To regulate the temperature, the apparatus comprises a progressive remote control button 22 capable of varying the pressure in the pipe thus allowing the user to vary the temperature of the water supplied by the spray bar 6 by controlling the closure or the total or partial opening of the slave valves 19 and 20 provided on the secondary lines 4 and 5 for introducing hot and cold water.

 This branch pipe 38 furthermore comprises a three-way electro-valve 16 placed between the branches situated upstream and downstream of the progressive remote control button 22 and whose tilting is caused by the pressurization of the safety pressure contact 13 , and another solenoid valve 17 placed directly upstream of the valves 19 and 20.

 Moreover, and according to FIG. 1, the safety pressure contact 13 is connected to the annex pipe 11 via a secondary pipe 12 on which the safety push-button valve is provided.

As a result, when the rod 80 of the handle 8 of the spray bar 6 comes, in the preparation position, to exert pressure on the push-button valve 9, the latter is actuated to introduce the pressure of the network into the pipe 12 and to control the implementation of the safety pressure contact 13 which, via the control damper B causes the opening of the safety valve 15 too.

 Simultaneously with this opening of the safety solenoid valve 15, the safety pressure contact ensures the tilting of the solenoid valves 16 and 17 causing the valves 19 and 20 to open fully, then, at the end of an adjustable temperature corresponding to the time required for the hot water introduced warms the constituent materials of the installation and warms and humidifies the air in the cabin A, the pump 3 start and a new tilt of the solenoid valve 16 that places the control valves under the sole dependence of the progressive remote control valve, then putting the user in a position to adjust by himself the temperature of the water delivered by the ramp 6.

 I1 is also provided on the main circuit 1, 2 a unidirectional valve 21 preventing any flow of water in the opposite direction, so as to ensure easy priming of the pump 3.

 Furthermore, the main pipe 1, 2 also comprises a pressure-sensitive holding contact 24 which is sensitive to the pressure established by the pump 3 in order to maintain the supply of its drive motor as well as a safety thermostat 25 which is capable of controlling the stopping of the circulation pump 3, and consequently the interruption of the supply of water to the spray bar when the temperature of the water exceeds a predetermined value TO.

 The implementation of the thermostat 25 is controlled by the safety pressure contact 13 during passage of the ramp 6 from the preparation position to the use position, and therefore, when the pressure of the network in the pipe 12 is released. .

 During the use phase, the temperature is adjusted by means of the remote control button 22 acting on the small hot water flow valve 19. The valve 20 isolated by the solenoid valve 15 is ineffective.

 Furthermore, there is provided in the shower enclosure A drain control button 27 placed on a pipe 28 which connects the pipe 11 to a manometric drain contact 29.

 This manometric emptying contact 29 which is also associated with the control register B, is sensitive to the pressure of the network transmitted to it by the pipe 28 during the operation of the drain control button 27 by the user.

 This manometric emptying contact 29, when it is solicited by the pressure of the network, switches the shutoff valves 30 and 31 directing the circulation towards the emptying line 33. Simultaneously, the emptying pressure contact 29 controls the tilting of 1 solenoid valve 17, and consequently the orientation of the three-way control valve 20 on the supply of cold water through the secondary pipe 5 and the closure 19.

 Furthermore, outside the shower enclosure A, there is provided a rinsing control button 34 that can be operated by the user to actuate means for controlling a rinsing operation of the apparatus corresponding to a rinsing operation. circulation of cold water in the main pipe 1, 2. These means comprise a rinsing electro-valve 36 whose opening causes the introduction into the main circuit 1, 2 of a dose of a bactericidal product initially contained in a bin 37.

 These means also comprise a three-way valve 35 whose tilting allows the cleaning of the filter 26 against the current during the drain ending the rinsing operation.

 The operation of the apparatus object of the present improvement corresponds to a series of phases of preparation, use, emptying and rinsing.

The state of the various organs constituting the apparatus during these different phases is summarized in the table in Appendix 1. The course of these phases is explained below.

 Upon entering the shower enclosure A, the user puts the spray bar 6 in the preparation position. At this moment, the lever 8, via the rod 80, exerts a pressure on the safety push-button valve 9 which, consequently, transmits the water pressure of the network which feeds it via the pipe 11 to the contact safety manometer 13 via the pipe 12.

As soon as it is requested, the safety pressure contact 13 triggers, via the control register B, the following operations
opening of the safety solenoid valve 15,
- Tilt electro-valves 16 and 17 which ensures, via the portion of the annex pipe 11 located downstream of the progressive remote control button 22, supplied with tap water, the operation of the control valves 19 and 20. The valve 19 which corresponds to the secondary pipe 41 of small flow opens wide. The three-way valve 20 switches to the hot water supply.

 Consequently, as a result of the maneuvers of the valves 15, 19 and 20, the hot water fills the return line 2 and then stopped by the unidirectional valve 21 which is provided with a small hole for the evacuation of the air, also completes driving 1.

After an adjustable delay (10 to 15 seconds) the following operations are triggered
- start of the pump 3,
- Switching of the solenoid valve 16: which has the consequence of placing the control valves 19 and 20 under the control of the progressive remote control valve 22.

 The user is then able to adjust the temperature of the water delivered by the ramp 6 by means of the remote control.

 The pressure established by the pump causes the pressure contact 24 which, at the control damper B, ensures a maintenance of the power supply of the pump drive motor.

As soon as the correct temperature is obtained, the user releases the handle 8, releasing the push-button valve 9, which triggers, via the safety pressure contact 13 and the control register
B, the following operations
closing the safety solenoid valve 15, which isolates the control valve from the high flow hot water supply 20,
- suppression of the order of march given to the pump which continues, however, to turn thanks to the self-maintenance,
- Activation of the safety thermostat 25 which, if it is requested by an excessive temperature, entails an immediate stop of the installation.

 The user can then proceed to the actual use phase by directing the jet of the ramp 6 and adjusting the temperature by controlling the small flow hot water control valve 19.

 The emailed product (washing agent, bath salts, seaweed extract, etc.) can be introduced at any time during the preparation or use phases by simple spilling on the floor of the cabin. .

 The ramp 6 may, itself, be arranged to dispense a gentle or energetic spray, dispersed or concentrated, stable or pulsating.

During the preparation and use phases, the flow of water passes through the purification filter 26. When it has finished, the user causes the system to be emptied by giving an impulse to the control valve of the control valve. emptying 27 which, via the pipe 26, solicits the manometric contact drain 29, which causes, thanks to the control register
B, the following operations
- Tilt electro-valves 30 and 31, which directs the flow to the drain circuit,
- Switching of the solenoid valve 17 which closes the control valve of the hot water supply small flow 19 and the orientation of the valve 20 on the cold water supply.

 When all the water contained in the receptacle is evacuated, the pump is de-primed, the discharge pressure drops and the pressure maintaining contact 24 cuts the self-maintenance of the motor of the pump 3 which stops.

Leaving the cabin, the user, by action on a control button 34 located outside the cabin
A, causes the next rinse cycle
- switching of the switching valves 30 and 31,
- Opening of the safety valve 15 causing the arrival of cold water.

After a delay of 10 to 15 seconds
- startup of the pump 3,
- closing of the safety valve 15,
- opening for 1 or 2 seconds of the rinse valve 36 to allow the introduction of a dose of bactericidal contained in the tray 37.

After a delay of 1 to 2 minutes
switching of the switching valves 30 and 31 and of the rinsing control valve 35, which causes the counter-filter 26 to be emptied and cleaned,
- stop pump 3 when the drain is complete.

 According to the variant shown in Figure 3, the cold water inlet in the secondary pipe 5 is controlled by the solenoid valve 50 while the hot water supply via the secondary pipe 4 is controlled by the electro -vanne 53 and feeds the auxiliary spray boom 52 through the pipe 51. An electric heater 54 associated with a thermostat 55 is further disposed on the main pipe 1, 2 downstream of the electric heater.

According to this variant, when he enters the shower enclosure A, the user places the lever 8 in the preparation position, which actuates the push-button valve 9, urges the pressure contact 13, and through the register 14 causes the following operations
opening of the cold water inlet solenoid valve 50 during a time delay T of a few seconds,
opening of the hot water solenoid valve 53,
- Then, the time delay T elapsed, it simultaneously obtains the closure of the cold water inlet valve 50, the start of the pump 3 and the heating of the heater 54.

 The temperature of the main circuit 1, 2 then rises under the simultaneous action of the hot water inlet and the electric heater. When this temperature reaches the set value set by the thermostat 55, the hot water supply solenoid valve 53 is closed and the electric heater 54 stops.

 Noting that the ramp 52 is no longer powered, the user then knows that the desired temperature is reached. It can therefore pass the spray bar 6 in the position of use. In doing so, it removes the running order of the pump 6, which continues to rotate thanks to self-holding and it prevents the opening of the hot water solenoid valve 53.

 Throughout the use phase, the temperature of the circuit is maintained by the electric heater 54 controlled by the thermostat 55.

 Then, before leaving the cabin, the user presses the valve button 27, which causes the pump to be emptied and stopped as previously indicated.

 The rinse cycle following use is identical to the cycle described above.

 The state of the various components constituting the apparatus according to this variant during the different phases of use is presumed in the table attached in Appendix 2.

 Of course, the above description should not be considered as being limiting of the invention.

 As a variant of this embodiment, there may be mentioned the one where the manual remote control of the valves 19 and 20 is replaced by a thermostatic or electronic regulator.

 As other variants of this embodiment, there may be mentioned one in which the hydraulic remote control is replaced by an infrared remote control, such as a television set.

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Claims (13)

1) Shower unit comprising a shower enclosure with a shower tray and a water spray boom, and a recirculation and regulation circuit capable of recovering the water dropped into the tank. shower to reintroduce it into the shower enclosure by the spray bar, under predetermined conditions of temperature and pressure, this recirculation and regulation circuit consisting of a main pipe constituted by a water inlet pipe connected to the spray boom and a return line comprising a circulation pump capable of recovering the water that has fallen into the shower tray and reintroducing it into the water supply and secondary lines pipe that can introduce water hot or cold from an outside network in the main pipe to which they are connected via control valves, as well as a ge connected to the main pipe via at least one switching valve, characterized in that the shower enclosure (A) comprises members, in particular a screen (10), allowing the orientation of the ramp spraying (6) between a use position and a preparation position in which the water spray can not reach the user either directly or by splashing. 20) Apparatus according to claim 1, characterized in that the secondary pipe for introducing hot water (4) is divided into its downstream part in two lines (40, 41) each connected to a control valve (20, 19). ) and capable of supplying hot water in the main pipe (1, 2) at different flow rates, the high flow being used for the initial filling and the low flow being used for. the subsequent maintenance of the temperature, and in that the secondary flows of high-flow (40) and cold-water (5) hot water (5) comprise a safety solenoid valve (15) of which the opening and closing are controlled from safety means so as to allow the introduction of a high flow of hot or cold water into the main pipe (1, 2) only when the spray boom (6) found in preparation position.  30) Apparatus according to claims 1 and 2, characterized in that the control valve (20) of the cold water supply secondary pipe (5) and the control valve (20) of the secondary pipe introduction high-flow hot water (40), are constituted by the same valve with three webs.  40) Apparatus according to any one of claims 1 to 3, characterized in that the shower enclosure (A) comprises a progressive remote control button (22) allowing the user to vary the temperature of the water supplied by the spray boom (6), by controlling the closure or the total or partial opening of the control valves (19, 20) provided on the secondary lines (4, 5), this push button (22) being associated with an electro -vanne (16) placed directly downstream and whose opening is driven by the pressurization of the safety pressure contact (13), so that the button (22) can control the hot water introduction valve or high flow rate (4, 5) during the preparation phase and only the small flow hot water inlet valve (4) during use.  50) Shower unit consisting of a shower enclosure with a shower tray and a water spray boom, and a recirculation and regulation circuit capable of recovering the water that has fallen into the shower tray to reintroduce it into the shower enclosure via the spray bar under predetermined conditions of temperature and pressure, this recirculation and regulation circuit consisting of a main pipe constituted by a water inlet pipe connected to the spray pipe and a return pipe comprising a circulation pump capable of recovering the water that has fallen into the shower tray and reintroducing it into the water inlet pipe, secondary pipes that can introduce hot water or cold from an external network in the main pipe and comprising electro-safety valves whose opening and closing are controlled in particular from e safety means so as to authorize an introduction of hot water or cold water into the main pipe only when the spray bar is in a preparation position in which the water spray can not reach the use neither directly nor by splashing, as well as a drain line connected to the main pipe via at least one switching valve, characterized in that the secondary pipe for introducing cold water (5 ) is connected to the main pipe (1,  2) upstream of the circulation pump (3) and in that the secondary hot water supply pipe (4) is directed towards the shower enclosure (A) where it feeds the shower tray (C), either directly or by a dispersion ramp arranged in such a way that the hot water can not reach the user either directly or by splashing.  60) Apparatus according to claims 1 and 5, characterized in that it comprises an electric heater (54) disposed on the main pipe (1, 2) and capable of maintaining the temperature during use.  70) Apparatus according to claims 1, 5 and 6, characterized in that the hot water solenoid valve (53) and the electric heater (54) are controlled in particular by the same control thermostat (55).  80) Apparatus according to any one of claims 1 to 7, characterized in that the safety means are constituted by a safety pressure contact (13) associated with a control register (B) for controlling the opening one or more electro-safety valves (15) allowing the inflow of cold water and hot water at a high flow rate, when it is subjected to a pressure, in particular the pressure of the network as well as by a push-button safety device (9) automatically actuated by the pulverisation ramp (6) in the preparation position for transmitting the pressure of the network to the safety pressure contact (13).  90) Apparatus according to any one of claims 1 to 8, characterized in that the pressurization of the safety pressure contact (13) causes the start of the circulation pump (3) with a time delay determined with respect to the opening of the safety solenoid valve (15).  100) Apparatus according to any one of claims 1 to 9, characterized in that it comprises a safety thermostat (25) capable of controlling the stopping of the circulation pump (3) and consequently the interruption of the supplying water to the spray boom (6) when the water temperature exceeds a predetermined value (TO), when the ramp (6) is in the use position.  110) Apparatus according to any one of claims 1 to 10, characterized in that the shower enclosure (A) comprises a drain control push-button valve (27) capable of being operated by use at the end of operation for transmitting the pressure of the network to a manometric discharge contact (29) associated with the control register (B) and triggers in return the actuation of the at least one switching valve (30, 31) and the direction of the circulation of water to the drain line (33).  120) Apparatus according to any one of claims 1 to 11, characterized in that it comprises a flushing control button (34) capable of being operated by the user to actuate control means of an operation rinsing the apparatus corresponding to a circulation of cold water in the main pipe (1, 2).  130) Apparatus according to any one of claims 1 to 12, characterized in that it comprises two switching valves (30, 31) separated by a filter (26) which is traversed by the circulating water in a first direction in use and in a second direction opposite to the first during the emptying after rinsing.  140) Apparatus according to any one of claims 1 to 13, characterized in that the control means of the rinsing operation comprise a rinsing electro-valve (35) whose opening causes the introduction into the circuit (1). 2) a dose of a bactericidal product initially contained in a tray (37).