FR2729461A1 - DEVICE FOR ADJUSTING THE PASSAGE SECTION OF A VENTILATION AIR VENT OF A PREMISES - Google Patents

Abstract

This device comprises on the one hand a first mechanical actuator (8) intended to vary the position of a shutter (4) as a function of a parameter, such as humidity or CO2 content, or allowing the shutter to be placed in a preset position corresponding for example to a regulatory flow requirement, and on the other hand a second mechanical actuator (9) intended to carry out at least the actuation of this flap (4), in a direction of increase in section passage, a declutching device (10, 13) being provided between the first actuator (8) and the flap (4) to allow the additional movement of the latter under the action of the second actuator (9).

Description

The present invention relates to a device for adjusting the

  passage section of a room air ventilation opening.

  It is common today to subject the ventilation of a room to the conditions prevailing in this room, in particular to the humidity conditions. It is therefore advisable to have a regulating member for the ventilation flow rate, which acts on the flow rate by opening more or less an extraction mouth, for example by acting on the angular position of one or more flaps. located in the flow passage of the fluid. If we want to ensure a flow required by regulations, such as a suction flow in the kitchen during meal preparation, called accelerated flow, it is not possible to take into account the possible opening of the modulated part. It is therefore advisable to have recourse to the opening of a large additional surface area, capable alone of providing the accelerated flow, even in the event of minimal opening of the controlled portion. In certain cases of significant needs, the open section is then much greater than what would be necessary, which translates into a significant energy cost in winter, since hot air is removed from the room to replace it with l cold air, and that excessive opening of a mouth results in a transmission of noise between the room in question and the premises

neighbors.

  The object of the invention is to provide an adjustment device which makes it possible to make the best use of an open surface, even a small one, by increasing this until the desired section is obtained, thus allowing only the section necessary for the obtaining a debit

accelerated.

  To this end, the device which it relates to, comprises on the one hand a first mechanical actuator intended to vary the position of a shutter as a function of a parameter, such as humidity or C02 content, or making it possible to place the flap in a preset position corresponding for example to a regulatory flow requirement, and on the other hand a second mechanical actuator intended to carry out at least the actuation of this flap in a direction of increase in the passage section, a declutching device being provided between the first actuator and the flap, to allow the additional movement of this

  the latter under the action of the second actuator.

  The first actuator can be a proportional control device of the hygrometric type, or controlled by the C02 content inside the room, or can also be a device allowing the shutter to be locked in a position determined by an installer to meet the need. regulatory debit for a home. As long as the second actuator is not used, the shutter operates in a

  conventional vis-à-vis the first actuator.

  The second actuator can also be controlled by the humidity or the CO 2 content, with a different range from the first actuator or a threshold. This second actuator can more generally be constituted by a manual or automatic control device which makes it possible to ensure an additional flow in the event of greater specific pollution (kitchen, shower, W-C, etc.). The additional flow obtained by additional opening of the flap between the position resulting from the first actuator, and the position resulting from the action of the second actuator makes it possible to obtain precisely the passage section for the desired air flow. The duration for which the second actuator acts can, for example, be fixed by a timer which makes it possible to limit the duration of the

  accelerated flow and therefore heat losses.

  Advantageously, the declutching device comprises an elastic return member for the flap in its position defined by the first

  actuator, when the action exerted by the second actuator ceases.

  The second actuator therefore acts on the flap only in the direction of opening thereof, the flap being returned to its position supplied by the first actuator as soon as the action exerted by the second actuator ceases. In addition, the force indirectly exerted by the elastic return member on the first actuator, during the action of the second actuator on the flap, is relatively low compared to the force brought into play for the operation of the first actuator, the ratio respective forces

being of the order of 1 to 3.

  The force exerted by the elastic return member must be low, so as not to disturb or damage the mechanism of the first actuator. This elastic reminder allows the mouth to function in a position other than the vertical, and avoids the phenomena of beat. According to one embodiment of this device, the connecting means between the first actuator and the flap on which it acts, comprise a first movable part, guided in movement, on which the actuator acts and a second part which is coupled to the flap, the second part being movable relative to the first part so that when the actuator acts on the first part in a direction of opening of the flap, it drives the second part which ensures the movement of the flap in the direction of the opening and while during the complementary pivoting of the flap by the second actuator the second part moves relatively to the first part, against the action of a return spring disposed between the first and the second part, tending bringing the second part into contact with the first part against the movement resulting from the control of the second actuator. In practice, the first actuator acts mechanically on the first part which causes the second part to move, the latter imposing on the flap its degree of opening taking into account the coupling between this second part and the flap. When the second actuator acts on the shutter in an opening direction thereof, there is a phenomenon of disengagement of the shutter with respect to the first

  actuator by displacement of the second part relative to the first.

  When the second actuator ceases to act on the flap, the return spring brings the second part into contact with the first, movement during which the flap moves in a closing direction to resume the

  position which results from the information supplied by the first actuator.

  According to a first embodiment of this device, the first and second parts are constituted by two parts guided longitudinally on the same support, the first of which is movable in both directions by slaving to the first actuator, and includes a heel or the like taking support against a part opposite the second part to drive the latter in translation in the direction

opening the shutter.

  According to another embodiment of this device, the first and second parts are constituted by two parts pivotally mounted about a same axis, the first of which is driven in both directions by slaving to the first actuator and comprises a heel or the like leaning against a part opposite the second

  part to drive it in rotation in the direction of opening of the shutter.

  Advantageously, the coupling between the second part and the flap is obtained by means of a lever bent twice, in the form of a crank, one end of which is wedged on one end of the axis of the flap, when the latter is pivoting, and the other end of which is engaged in a lumen of the second part, and the second actuator acts directly or indirectly on a crank wedged on the other end

of the axis of the flap.

  The use of a crank system can be done when the shutter drive part moves linearly or when this

workpiece is rotated.

  The ventilation opening equipped with the device according to the invention may comprise a single flap, or two flaps, one of which is controlled

  by the first actuator and secondarily by the second actuator

  beyond the position provided by the first actuator and independently of the latter, and the other of which is controlled only by the second

  actuator and directly slaved to it.

  Advantageously, the flap or flaps are mounted on a removable box fitted to the mouth, the ends of the bent levers being engaged in slots with conical inlets that comprise the drive parts associated with the actuators. It is therefore very easy to dismantle, by simple extraction, the box equipped with its flaps, in order to

  perform cleaning, for example.

  Finally, to avoid impact or vibration noises during the movement of the flaps, in particular at low opening, one of the flaps is arranged to pass in front of the other, without collision in a race beyond

  from the position defined by end stops.

  In any case, the invention will be well understood using the

  description which follows with reference to the attached schematic drawing

  representing, by way of nonlimiting examples, two embodiments of

these measures.

  Figure 1 is a perspective front view, partially in section, of a first device equipping a ventilation opening provided with two shutters pivoting in opposite directions to each other, Figure 2 is a perspective view , partially cut and on an enlarged scale of the elements for transmitting the movement between the first actuator and a flap, Figures 3 and 4 are two views similar to Figure 1 showing the device in two other operating positions, Figures 5 and 6 are two views in partially sectioned perspective representing a second device comprising two pivoting flaps

  in the same direction, in two operating positions.

  Figure 1 shows an air extraction port 2 in a technical room of a room, such as a bathroom, a kitchen or W-C if it is a dwelling. This air extraction mouth comprises a box 1 provided with an opening 3, the section of which can be adjusted by means of two flaps 4 and 5 pivoting in opposite directions from one another around two parallel axes 6 and 7 respectively. The variation of the angular position of the two flaps 4 and 5 makes it possible to vary the passage section in order to adapt the air flow to the need for ventilation. The angular position of the two flaps 4 and 5 is adjusted by two actuators, the one shown in the left part of the figure being a hygrometric actuator comprising a braid 8, the length of which varies according to the humidity, and the actuator 9 shown in the right part of the drawing is for example a manual actuator making it possible to increase the passage section as much as possible when the

ventilation requirements require it.

  One end of the braid 8, the lower one, is fixed and integral with the chassis of the apparatus, while its upper end is fixed on a first part 10 mounted and sliding on the chassis of the apparatus. This part 10 is subjected to the action of a spring 12 which acts on it from bottom to top, in a direction of extension of the braid 8. When the air is dry, the length of the braid 8 is minimal, and the part 10 occupies a low position. On the contrary, when the humidity increases, the braid 8 becomes longer, and the first part 10 moves upwards, under the action of the return spring 12. On the first part 10 is slidably mounted in the same direction a part 13. This part 13 bears against a heel 14 of the part 10, this support being maintained under the action of a return spring 15, one end of which is fixed to the part and the other end of which is fixed on the part 13. It is visible, in particular in FIG. 1, that there is a clearance J between the parts 10 and 13

  allowing relative movement from bottom to top of the second piece opposite

  screw of the second part 13 vis-à-vis the first part 10. In the second part 13 is provided a light 16 with a conical inlet in which is engaged one end 17 of an elbow lever 18 in the form of a crank, the l other end 19 is wedged on the axis 6. The orientation of the crank 18 is such that it drives the flap 4 in one direction

  when the part 13 moves from bottom to top.

  The second actuator shown in the right part of FIG. 1 comprises an outlet rod 20 acting on a connecting rod 22. This

  connecting rod 22 moves up and down when the actuator is controlled.

  In the connecting rod 22 is formed a light 23 with a conical inlet in which is engaged one end 24 of a crank 25 whose other end 26 is wedged on the axis 7 of the second flap. The mounting of the crank 25 is such that it drives the flap to an open position when the connecting rod 22 is moved up and down. During its downward movement, the lower end of the connecting rod 22 is capable of bearing on one end 27 of a crank 28 whose other end 29 is wedged at the end of the axis 6 of the flap 4 opposite to that equipped with the crank 18. The cranks 18 and 28 are mounted in opposition so that a downward movement of the connecting rod 22 results in an action on the crank 28

causing the shutter to open 4.

  The axes 6,7 of the flaps 4,5 are mounted by snap-fastening inside bearings allowing their rotation on the box 1, and the ends of the levers 18, 25 are engaged in apertures with conical entry. Thus, box 1 can be very easily dismantled to

  allow cleaning of the assembly.

  Starting from the position shown in FIG. 1, when the humidity in the room equipped with the ventilation mouth increases, the braid 8 becomes longer and the mobile assembly constituted by parts 10 and 13 moves upwards, causing by means of the crank 18 the tilting of the shutter 4 in an opening direction, as shown in FIG. 3. If one wishes to temporarily increase the ventilation flow, for example if the mouth is placed in a kitchen, it is possible to act on the second actuator 9. This results in a downward movement of the connecting rod 22 which results in a tilting of the flap 5 in the direction of opening and in a complementary tilting of the flap 4 in one direction opening, this additional tilting being made possible by the relative movement of the second part 13 with respect to the first part 10, against the action of the spring 15. When the actuator 9 is deactivated, the rod 22 is ra peeled up towards its position in FIGS. 1 and 3, which results in the tilting of the second flap 5 towards its closed position, and in the release of the crank 28, allowing the second part 13 to be recalled to the contact of the first part 10 by the spring 15, and consequently the flap 4 to occupy the angular position which

  is imposed only by the first actuator 8.

  Figures 5 and 6 show another embodiment of this device in which the same elements are designated by

  same references as before.

  In this second device, the extraction mouth has two openings, one associated with each of the flaps 4 and 5, the two flaps pivoting this time in the same direction. The essential difference with the first embodiment is that the two cranks 18 and 28 are oriented in the same direction, the movable element consisting of the parts and 13 moving no longer from bottom to top to open the shutter 4, but from top to bottom, as well as the connecting rod 22 driven by the

second actuator 9.

  As is apparent from the above, the invention brings a great improvement to the existing technique by providing a device making it possible to increase the passage section subject to a first parameter to increase the ventilation flow rate, which makes it possible to use at best a reduced open area while minimizing heat loss as well as acoustic transmission between different premises

of the same building.

  As it goes without saying, the invention is not limited to the sole embodiments of this device described above by way of example, on the contrary it embraces all of the variant embodiments thereof .; this is in particular that the parts 10 and 13 of the movable assembly associated with the first actuator could not be sliding, but pivoting, that the drive in rotation of the flaps could be achieved not by means of a crank , but directly from the second

  moving part insofar as it is pivoting, that the flaps could not be pivoting, but sliding, or that this device could comprise only one flap without leaving the framework of the invention.

Claims (10)

  1. Device for adjusting the passage section of an air ventilation opening in a room, by modifying the position of at least one flap, characterized in that it comprises on the one hand a first actuator (8) mechanical intended to vary the position of a shutter (4) according to a parameter, such as humidity or C02 content, or allowing the shutter to be placed in a preset position corresponding for example to a requirement regulatory flow, and secondly a second mechanical actuator (9) intended to carry out at least the actuation of this flap (4), in a direction of increase in the passage section, a declutching device (10, 13) being provided between the first actuator (8) and the flap (4) to allow the additional movement of the latter   under the action of the second actuator (9).   2. Device according to claim 1 characterized in that the declutching device comprises an elastic return member (15) of the flap (4) in its position defined by the first actuator (8) when ceases   the action exerted by the second actuator (9).   3. Device according to claim 2, characterized in that the force indirectly exerted by the elastic return member (15) on the first actuator (8), during the action of the second actuator (9) on the flap (4) is relatively low compared to the force involved for the operation of the first actuator (8), the ratio of forces   respective being of the order of 1 to 3.   4. Device according to any one of claims 1 and 2,   characterized in that the connecting means between the first actuator (8) and the flap (4) on which it acts comprise a first movable part (10), guided in movement, on which the actuator (8) acts, and a second part (13) which is coupled to the flap (4), the second part (13) being displaceable relative to the first part (10) so that when the actuator (8) acts on the first part (10), in a direction of opening of the shutter (4), it drives the second part (13) which ensures the movement of the shutter in the direction of opening, while during the complementary pivoting of the shutter (4) by the second actuator ( 9), the second part (13) moves relative to the first part (10), against the action of a return spring (15) disposed between the first part (10) and the second part ( 13), tending to bring the second part (13) into contact with the first part (10), against the movement   resulting from the control of the second actuator (9).   5. Device according to claim 4, characterized in that the first and second parts (10, 13) consist of two parts guided longitudinally on the same support, the first of which is movable in both directions by slaving to the first actuator (8) , and comprises a heel (14) or the like bearing against a part facing the second part (13) to drive the latter in translation   in the direction of opening of the flap (4).   6. Device according to claim 4, characterized in that the first and second parts (10, 13) are constituted by two parts pivotally mounted about a same axis, the first of which is driven in both directions by slaving to the first actuator and comprises a heel or the like bearing against a part opposite the second part to drive the latter in rotation in the opening direction of the shutter.   7. Device according to any one of claims 3 to 6,   characterized in that the coupling between the second part (13) and the flap (4) is obtained by means of a lever (18) bent twice, in the form of a crank, of which one end (19) is wedged on one end of the axis of the flap when the latter is pivoting, and the other end (17) of which is engaged in a hole (16) in the second part (13), and in that the second actuator (9 ) acts directly or indirectly on a   crank (28) wedged on the other end of the axis (6) of the flap (4).   8. Device according to any one of claims 1 to 7,   characterized in that the ventilation opening comprises two flaps (4, 5) one of which is controlled by the first actuator (8) and secondarily by the second actuator (9) beyond the position provided by the first actuator and independently of the latter, and the other (5) of which is controlled only by the second actuator (9) and directly controlled to this one.   9. Device according to claim 7, characterized in that the flap or flaps (4, 5) are mounted on a removable box (1) fitted to the mouth, the ends of the bent levers (18, 25) being engaged in lights ( 16, 23), with conical inlets on the parts   (13, 22) drive associated with the actuators.   1l1 10. Device according to claim 8, characterized in that, to avoid noises of impact or vibration during the movement of   flaps, in particular with a small opening, one of the flaps (4, 5) is arranged to pass in front of the other, without collision in a race beyond the position defined by end stops.