FR2995065A1 - Ventilation installation for livestock building of animals, has screw or nut system comprising nut fixedly mounted to rotate around screw, where screw is equipped with drive motor extended between flap and rest of installation - Google Patents

Abstract

The installation has a fluid circulation circuit (13) equipped with a ventilation mixer (14) in a connection zone to another fluid circulation circuit (10). A pivotable displacement drive unit (16) e.g. screw/nut system drives a flap (5) of the mixer around an axis between extreme closing positions of the circuits to obtain fresh or recycled air flow. The system has a nut threaded on a screw and fixedly mounted to rotate around the screw. The screw is equipped with a rotational drive motor extended between the flap and rest of the installation similar to a connection arm.

Description

The present invention relates to a ventilation installation, including livestock building.

It relates more particularly to a ventilation system of the type comprising a box equipped with air intakes and outlets able to be positioned one inside said zone to be ventilated, the other, so-called outer, to the outside of the zone to be ventilated, a heat exchanger housed at least partially inside said box and means for circulating air through said box, said air circulation means comprising first forced circulation means of air through a first fluid circulation circuit, said air supply, the area to be ventilated, the first fluid circulation circuit extending between an outside air inlet of the box and an outlet of internal air of the box through the heat exchanger, second means for forced air circulation through a second fluid circulation circuit, said air extraction, the area to be ventilated, this second fluid circulation circuit extending between an internal air inlet of the box and an external air outlet of the box through the heat exchanger, a third fluid circulation circuit, said recirculation circuit air, extending between an internal air inlet of the box and an air outlet opening into the first air supply fluid circulation circuit of the zone to be ventilated, this third fluid circulation circuit being equipped , in its zone of connection to the first fluid circulation circuit, a mixing valve, said mixing valve comprising at least one pivoting flap coupled to the remainder of the installation by a connection pivoting about an axis called axis of rotation of the shutter, and drive means for pivotally moving the shutter about its axis of rotation between an extreme position of closure of the first fluid circuit and an extreme position of closure of the shutter. third fluid circuit to obtain at the outlet of the first fluid circulation circuit a fresh air flow, or a recycled air stream, or a mixture of fresh air and recycled air.

In some buildings, especially animal housing, it is necessary to renew the air in quantities varying according to the live weight of the animals. Generally, ventilation systems that allow this renewal of air operate discontinuously. They draw fresh air, still called fresh air, outside the building to inject into the building and extract in parallel the stale air of the building. This discontinuous operation is linked to the fact that the temperature of the outside air is different from the air temperature of the building so that continuous operation would lead to a drop in temperature and possibly hygrometry problems. Due to this intermittent operation, the fresh air introduced into the building forms a heterogeneous mixture with the ambient air of the building. For a ventilation system to be effective and to obtain a homogeneous air in the ventilated zone, it is necessary firstly, that the air flow of the installation is important and that the operation of the installation is as continuous as possible to allow effective mixing of the air, on the other hand, that the temperature of the incoming air is as close as possible to the outgoing air to form a homogeneous mixture with the ambient air of the area to be ventilated. To obtain air entering at high temperature, there is the solution of heating this incoming air by means of a burner.

However, this solution is expensive because of the energy consumption generated. More recently, therefore have appeared on the market of the type of installation incorporating a heat exchanger.

The presence of a heat exchanger makes it possible to heat the incoming air circulating in the first circuit by transferring the thermal energy of the outgoing air circulating in the second circuit without the air flows of the first and second circuits being are mixed because the first circuit is independent of the second circuit, that is to say does not include communication with the second circuit.

In parallel, the presence of the aeraulic mixing valve makes it possible to replace, in the ventilated zone, the extracted air by a flow of fresh air, while allowing a continuous operation of the installation and maintaining an air intake flow rate. high and constant in the ventilated area. The first forced air circulation means of the installation that supply the ventilated zone with air can therefore operate continuously at a constant and high flow rate thus ensuring an efficient mixing of the air entering the zone to be ventilated with the rest. from the air of the area.

However, until now, the flap of the aeration mixer is equipped with a motor in direct contact with the axis of rotation of the flap to allow the rotational drive of said flap. This results in a number of disadvantages. Indeed, it is found that, as the flap is subjected to a depression, it tends to open or open-unintentionally due to its lack of resistance to depression. In addition, the motorization system generates inaccuracy in the control of the opening angle so that a fine and precise adjustment of air flow is impossible. An object of the present invention is therefore to provide an installation of the aforementioned type 20 whose design prevents an accidental flap of the constituent flap of the mixer and allows a fine adjustment of the movement of the flap. For this purpose, the subject of the invention is a ventilation installation, in particular a livestock building, of the type comprising a box equipped with air inlets and outlets able to be positioned at the inside, inside the zone to be ventilated, the others, so-called outside, outside the zone to be ventilated, a heat exchanger housed at least partially inside said box and means for circulating air through said box said air circulation means comprising first forced air circulation means 30 through a first fluid circulation circuit, said air supply, of the zone to be ventilated, this first fluid circulation circuit s extending between an outside air inlet of the box and an internal air outlet of the box through the heat exchanger, second forced circulation means of air through a second fluid circulation circuit, said extracting air from the zone to be ventilated, this second fluid circulation circuit extending between an inside air inlet of the caisson and an outside air outlet of the caisson passing through the heat exchanger, a third fluid circulation circuit, said air recirculation circuit, extending between an internal air inlet of the box and an air outlet opening into the first air supply fluid circulation circuit of the zone to be ventilated, this third fluid circulation circuit being equipped, in its zone of connection with the first fluid circulation circuit, with a mixing valve, said mixing valve comprising at least one pivoting flap coupled to the remainder of the installation by a link pivoting about an axis called axis of rotation of the flap and means for driving in pivotal displacement of the flap about its axis of rotation between an end position of closure of the first fluid circuit e t an extreme closing position of the third fluid circuit to obtain at the outlet of the first fluid circulation circuit a flow of fresh air, or a stream of recycled air, or a mixture of fresh air and recycled air, characterized in that the drive means in pivotal displacement of the flap are screw / nut type means with the nut, coaxial with the screw, threaded on the screw and mounted fixed in rotation around the screw and the screw, equipped with driving means for driving the screw on itself, extending in the manner of a connecting arm, between the shutter and the rest of the installation.

The displacement drive of the flap of the aeration mixer by a screw / nut system, capable of allowing the transformation of the rotational movement of the screw into a linear relative displacement of the screw and the nut, allows a fine angular displacement, precise , and not untimely said flap.

Preferably, the screw and the nut are respectively coupled to the rest of the installation by a rotational mounting about an axis parallel to the axis of rotation of the flap.

In particular, a portion of the screw is enclosed, with its drive means for driving in rotation, inside a housing mounted on the part of the installation, other than the flap, so that it can be pivoted around a axis parallel to the axis of rotation of the flap. The nut is carried by the flap and is housed, in an orientable manner, about an axis parallel to the axis of rotation of the flap, inside a window formed in said flap. Preferably, the axis of rotation of the screw on itself extends substantially perpendicular to the axis of rotation of the flap. Preferably, the installation comprises means for cleaning the screw. This arrangement makes it possible to prevent too fast fouling of the drive system disposed in the exhaust air flow. Preferably, the cleaning means are brush-type static cleaning means. Generally, the second means of forced circulation of air with adjustable air flow are equipped with means for controlling the air flow rate as a function of the renewal air demand of the zone to be ventilated and the driving motor means. in rotation of the screw on itself are equipped with control means according to at least the air flow rate of the second means of forced circulation of air so as to replace, in the ventilated zone, the air extracted from the zone ventilated by the second means of forced circulation of air by a flow of fresh air. Advantageously, the drive means of the drive means for rotating the screw on itself are configured to cause the shutter 30 to assume a position in which the air flow at the inlet of the first fluid circulation circuit is substantially equal. to the air flow of the second means of forced circulation of air.

Preferably, the driving means of the drive motors in rotation of the screw on itself are configured to make the shutter take the extreme closed position of the first fluid circulation circuit at the stop of the second forced circulation means of air and the second fluid circulation circuit is closable with a shutter member biased to the closed position of the circuit at the stop of the second means forced circulation of air.

Thanks to this arrangement, any entry of stray air is prevented at stopping the second forced air circulation means. The invention will be better understood on reading the following description of exemplary embodiments, with reference to the appended drawings in which: FIG. 1 represents a schematic overview of a ventilation installation according to the invention; Figure 2 shows a schematic view of the shutter with the associated screw / nut system and the connection to the rest of the installation; Figure 3 shows a perspective view of the shutter with the associated screw / nut system and its connection to the rest of the installation; FIG. 4 represents a perspective view in transparency of an installation in which the screw / nut system has been omitted to better visualize the various air circulation circuits; As mentioned above, the ventilation system, which is the subject of the invention, is more particularly intended for building ventilation. This installation comprises a caisson 1 equipped with inlets 2, 3, 4 and air outlets 5, 6 positioned one inside said zone 19 to be ventilated; outside of zone 19 to ventilate. In the examples shown, the box is a box, preferably made of plastic, of generally polygonal shape. This box comprises three air inlets, namely two inlets 2, 3 of indoor air and an inlet 4 of outside air and two air outlets, namely an indoor air outlet and an outlet 6 of air. outside air. Each air inlet or outlet is formed by an opening in the box, said opening being equipped or not with a mouth made for example by means of an insert. In the case where the opening is equipped with a mouth, this mouth may comprise an air duct formed by a first tubular body, connectable at the inlet to the air supply opening to be equipped, and a second tubular body , mounted to interlock orientably relative to the first tubular body to guide a flow of air out of the mouth.

This box 1 is generally positioned in a delimiting wall of the zone 19 to be ventilated, shown in dashed lines in FIG. 1, so that a part of the box 1, in this case that equipped with the external air inlets and outlets. extends outside the zone 19 to ventilate and generally outside the building, while the other part of the box, in this case that equipped with the inner air intakes and outlets of the box, s' extends inside the zone 19 to ventilate. The installation further comprises a heat exchanger 7 housed at least partially inside said caisson 1 and means for circulating air through said caisson 1. These air circulation means comprise first means 9 for forced circulation of air through a first circuit 10 fluid circulation, said air supply, the zone 19 to ventilate. This first fluid circulation circuit 10 extends between an external air inlet 4 of the box and an internal air outlet 5 of the box 1 through the heat exchanger 7. The air circulation means further comprise second means 11 for forced air circulation through a second circuit 12 of fluid circulation, said air extraction, the area 19 to ventilate. This second fluid circulation circuit 12, independent of the first fluid circulation circuit 10, extends between an inlet 2 of indoor air of the box and an outlet 6 of outside air of the box through the exchanger 7 heat. These second means 11 for forced air flow adjustable air flow are equipped with air flow control means according to the renewal air demand of the zone 19 to ventilate. This second fluid circulation circuit 12 is closable with the aid of a closure member biased to the closed position of the circuit when the second means 10 for forced circulation of air are stopped. The installation also comprises a third fluid circulation circuit 13, referred to as an air recirculation circuit, extending between an air inlet 3 of the chamber interior and an air outlet 21 opening into the first circuit 10 of 15 circulation of air supply fluid from the zone 19 to be ventilated. This third fluid circulation circuit 13 is equipped, in its connection zone with the first fluid circulation circuit 10, with a controllable aeration mixer 14 to obtain at the outlet of the first fluid circulation circuit 10 a flow of fresh air. , or a recycled air stream, or a mixture of fresh air and recycled air. This ventilation mixer 14 is controlled as a function of at least the air flow rate of the second means 11 for forced circulation of air so as to replace, in the ventilated zone 19, the air extracted from the zone 19 ventilated by the second means. 11 forced circulation of air by a flow of fresh air without interfering with the operation, in particular on the air flow of the first means of forced circulation of air. It should be noted that the circuits are, each time, outside the portion formed by the heat exchanger itself, delimited by partitions of the box. The first means 9 for forced circulation of air, such as a fan, are arranged on the section of the first fluid circulation circuit 10 extending between the outlet 21 of the third fluid circulation circuit 13 in the first circuit. 10 of fluid circulation and the inner air outlet of the box forming the air outlet of said first fluid circulation circuit.

The outlet 21 of the third fluid circulation circuit 13 in the first fluid circulation circuit 10 is disposed on the first fluid circulation circuit 10 downstream of the heat exchanger 7. The second means 11 for forced circulation of air, such as a fan, 10 are arranged on the air inlet side of the second circuit 12 for fluid circulation. The interior air inlet 2 of the caisson 1 forming the air inlet of the second fluid circulation circuit 12 and the interior air outlet of the caisson 1 forming the air outlet of the first circulation circulation circuit 10. fluid are formed on the same face of the box 1 at least partially polygonal. The face of the box 1, equipped with the inlet 2 of the chamber interior air which forms the air inlet of the second circuit 12 for fluid circulation and the interior air outlet 5 of the box 1 which forms the outlet The air inlet of the first fluid circulation circuit 10 further comprises the interior air inlet 3 of the caisson 1 which forms the air inlet of the third fluid circulation circuit 13. The heat exchanger 7 is a plate heat exchanger comprising at least two air inlets and two air outlets. One of the air inlets of the plate heat exchanger 7 coincides with the external air inlet 4 of the box 1 corresponding to the air inlet of the first fluid circulation circuit 10. The mixing valve 14 comprises a flap 15 coupled to the remainder of the installation by a connection pivoting about an axis) (X 'called the axis of rotation of the flap 15 and the means 16 for driving in pivotal displacement of the flap 15 around its axis) (X 'of rotation between an extreme position of closure of the first fluid circulation circuit 10 and an extreme closing position of the third fluid circulation circuit 13 to obtain at the output of the first fluid circulation circuit 10 a flow of fresh air, or a stream of recycled air, or a mixture of fresh air and recycled air.These means 16 for driving in pivotal displacement of the flap 15 about its axis XX 'are means of the screw / nut type with the nut 161 inserted, inside a window 18 arranged in the flap 15, fixedly rotatable about its axis and freely pivotable about a parallel axis ZZ ' to the axis XX 'of rotation of the flap 15, and with a part the screw threaded into said nut and another portion of the screw 162 enclosed, with its means 163 motors, inside a housing 164 mounted, free to pivot about an axis YY 'parallel to the axis) (X 'of rotation of the flap 15, on the part of the installation other than the flap 15.

In the examples shown, the screw and its housing are pivotally mounted on the frame of the opening 21 closed by the flap 15 and formed by the outlet of the third fluid circulation circuit 13 in the first circuit 10 of fluid circulation.

In the example shown, this frame is formed of a frame and an additional cross-member compartmentalizing the frame. The housing 164 comprises, formed on two opposite end faces of the housing, a pivot axis, said pivot axes each extending between the additional cross and a cross member of the frame. The means 163 drive motors in rotation of the screw are reversible motor means able to drive the screw in both directions of rotation according to the desired movement of opening or closing the shutter. As illustrated in FIG. 3, such an assembly makes it possible, during driving in rotation of the screw by the drive means in a first direction of rotation, to move the flap in the direction of closing the output of the air 21 of the third fluid circulation circuit 13 in the first fluid circulation circuit 10 simultaneously with the opening of the first fluid circulation circuit 10. Indeed, during this drive in rotation of the screw, the latter, rotated in the nut, causes a displacement of the nut and the associated flap in the direction of a closer of the flap of the outlet 21 of the third circuit 13 of fluid circulation. During this axial displacement of the nut along the screw, the nut is self-orienting inside the window formed in the flap 15 by pivoting about an axis parallel to the axis YY ' rotation of the shutter. It is the same for the housing 164 which is self-orienting by pivoting about an axis parallel to the axis YY 'of rotation of the flap, which allows an axial displacement of the nut along the screw without jamming. . During a reversal of the direction of rotation of the drive motor in rotation of the screw about its axis, there is an angular displacement in a direction opposite to the flap. During this movement of the nut along the screw, two brushes, which are arranged along the so-called vertical edges of the window housing the nut, ensure by simple contact cleaning the screw. By vertical edges of the window is meant the edges of the window which extend substantially parallel to the axis (X 'of rotation of the flap 15. The bristles of the brushes extend for their part, substantially parallel to the plane of the window. shutter.

During its drive in rotation, the screw thus more or less protrudes from the face of the flap opposite to that positionable to apply to the air outlet 21 of the third fluid circulation circuit in the first fluid circulation circuit. The control of the motor drive means 163 for rotating the screw is effected by means of control means. These control means are formed by an electronic and computer processing and calculation unit. Said unit may be in the form of an electronic circuit provided with a microcontroller or a microprocessor associated with a data storage memory. Thus, when in the following description, it is stated that given means are configured to perform a given operation, it means that the electronic and computer system that forms said means comprises computer instructions for performing said operation.

The means for controlling the aeration mixer 14 are configured to cause the flap 15 of the mixer 14 to assume a position in which the air flow at the inlet of the first fluid circulation circuit 10 is substantially equal to the air flow rate of the second means 11 forced circulation of air. In other words, the control means of the mixer 14 aeraulic are configured to make the flap 15 of the mixing valve 14 an end position P1 closing the first circuit 10 of fluid circulation when the second means 11 forced circulation of air are at a standstill and a closing position P2 of the outlet 21 of the third circuit opening into the first circuit 10 for fluid circulation when the second means 11 forced circulation of air operate at maximum flow and finally an intermediate position between these two extreme positions P1 and P2 as a function of the selected flow rate between the minimum flow rate and the maximum flow rate for the second means 11 for forced circulation of air. The means for controlling the means 163 for rotating the screw also control the operation, in particular the adjustment of the air flow rate of the second means 11 for forced circulation of air. This adjustment of the air flow rate of the second means 11 of forced circulation of air is a function of the needs for renewal of air which can be programmed according to the nature and characteristics of the farm animals or which can be calculated and stored from data obtained using sensors disposed within the area to be ventilated.

Claims (11)

REVENDICATIONS1. Ventilation system, in particular for livestock buildings, of the type comprising a box (1) equipped with inlets (2, 3, 4) and air outlets (5; 6) capable of being positioned one at a time (2, 3, 5), said inside, inside the zone (19) to be ventilated, the others (4, 6), said outside, outside the zone (19) to be ventilated, an exchanger (7) of heat housed at least partially inside said box (1) and air circulation means through said box (1), said air circulation means comprising first means (9) of forced circulation of air through a first circuit (10) of fluid circulation, said air supply, the area (19) to ventilate, the first circuit (10) for fluid circulation extending between an inlet (4) d outside air of the box and an outlet (5) of interior air of the box (1) through the exchanger (7) of heat, second means (11) forced circulation of air through s a second circuit (12) of fluid circulation, called air extraction, of the zone (19) to be ventilated, this second circuit (12) for fluid circulation extending between an inlet (2) of inside air of the box and an outlet (6) of outside air of the box through the heat exchanger (7), a third circuit (13) of fluid circulation, said recirculation circuit, extending between an inlet (3) of interior air of the box and an air outlet (21) opening into the first circuit (10) for circulating air supply fluid of the zone (19) to be ventilated, this third circuit Fluid circulation (13) being equipped, in its zone of connection to the first circuit (10) for circulating fluid, with a mixing valve (14) aeraulic, said mixer (14) comprising at least one flap (15) pivoted coupled to the remainder of the installation by a link pivoting about an axis (XX ') called the axis of rotation of the flap (15) and means (16) drives in pivotal movement of the flap (15) about its axis (XX ') of rotation between an extreme closing position of the first fluid circuit (10) and an extreme closing position of the third fluid circuit (13) to obtain at the outlet of the first fluid circulation circuit (10) a flow of fresh air, or a stream of recycled air, or a mixture of fresh air and recirculated air, characterized in that the means (16) of drive in pivoting movement of the flap (15) are screw / nut-type means with the nut (161), coaxial with the screw (162), threaded onto the screw (162) and mounted fixed in rotation around the screw (162) and the screw (162), equipped with means (163) driving motors in rotation of the screw (162) on itself, extending in the manner of a connecting arm, between the shutter (15) and the rest of the installation. 2. Installation according to claim 1, characterized in that the screw (162) and the nut (161) are respectively coupled to the remainder of the installation by a rotational mounting about an axis parallel to the axis ( XX ') of rotation of the flap (15). 3. Installation according to one of claims 1 or 2, characterized in that a portion of the screw (162) is enclosed, with its means (163) rotational drive motors, inside a housing (164) mounted on the part of the installation, other than the flap (15), in an orientable manner, around an axis (YY ') parallel to the axis (XX') of rotation of the flap (15 ). 20 4. Installation according to one of claims 1 to 3, characterized in that the axis (WW ') of rotation of the screw (162) on itself extends substantially perpendicular to the axis (XX') of rotation of the flap (15). 25 5. Installation according to one of the preceding claims, characterized in that it comprises means (17) for cleaning the screw (162). 6. Installation according to claim 5, characterized in that said cleaning means (17) are brush-type static cleaning means. 7. Installation according to one of the preceding claims, characterized in that the nut (161) is carried by the flap (15) and is housed, in a rotatable manner, about an axis (ZZ ') parallel to the axis (XX ') of rotation of the flap (15), inside a window (18) formed in said flap (15). 8. Installation according to claim 7, taken in combination with claim 5, characterized in that said cleaning means (17) are arranged along the vertical edges of the window (18), said edges extending substantially parallel to the axis (XX ') of rotation of the flap (15). 9. Installation according to one of the preceding claims, characterized in that the second means (11) forced air circulation adjustable air flow are equipped with air flow control means according to the demand. in the renewal air of the zone (19) to be ventilated and in that the means (163) for driving the screw (162) in rotation on itself are equipped with control means as a function of at least the flow rate of air of the second means (11) of forced circulation of air so as to replace, in the ventilated zone (19), the air extracted from the zone (19) ventilated by the second means (11) of forced circulation of air, by a flow of fresh air. 10. Installation according to claim 9, characterized in that the control means of the means (163) driving motors in rotation of the screw (162) on itself are configured to make the flap (15) take a position wherein the inlet air flow rate of the first fluid circulation circuit (10) is substantially equal to the air flow rate of the second forced air circulation means (11). 11. Installation according to one of claims 1 to 8, characterized in that the control means of the means (163) drive motors in rotation of the screw (162) on itself are configured to make the shutter (15) the extreme closing position of the first fluid circulation circuit (10) when the second forced air circulation means (11) is stopped and in that the second fluid circulation circuit (12) is closable; by means of a closure member biased to the closed position of the circuit when the second means (11) of forced circulation of air are stopped.