FR3096117A1 - ROOM VENTILATION DEVICE - Google Patents

Abstract

The invention relates to a device for ventilating a room (L), comprising a box (2) provided with an inlet (3) for an air flow (F) and an outlet (4) of said air flow (F), the ventilation device being configured so that said air flow (F) circulates in the box (2) between said inlet (3) and said outlet (4), the box (2) comprising a housing (10) of at least one electronic component (11) and an internal element (9) separate from the housing (10), the internal element (9) being shaped to be crossed by a first part of the flow of air (F), called main flow (FP), and the housing (10) being shaped to be traversed by a second part of the air flow (F), called bypass flow (FC), so as to cool said au minus one electronic component (11) of the housing (10).

Description

VENTILATION DEVICE FOR A ROOM

The invention relates to a device for ventilation of a room, such as a building, and in particular to a dual-flow unit.

A room ventilation device conventionally comprises a box provided with a first inlet of a first air flow and a first outlet of said first air flow, the air flow circulating in the box between the entry and exit. In the case of a dual-flow unit, the casing also comprises a second inlet for a second air flow and a second outlet for a second air flow, the second air flow circulating in the casing between the second input and the second output.

For example, the first air flow is an incoming flow, i.e. coming from outside and intended to ventilate the room, while the second air flow is an outgoing flow, i.e. that is to say from the local and intended to be extracted from it.

Generally, a heat exchanger is provided in the box to allow heat exchange between the incoming and outgoing air flows, which ensures thermalization of the incoming flow before its introduction into the room.

In a known manner, the box also comprises at least one box, called an electronic box, containing electronic components, such as frequency converters, electronic cards, automaton, power transformer, motor, etc., the cooling of which must be guaranteed. , for example with a dedicated cooling system.

Nevertheless, this configuration has the drawbacks of reducing the aeraulic efficiency and/or of increasing the electrical consumption of the ventilation device and of increasing its size.

The object of the invention is to remedy these drawbacks.

An object of the invention is to provide a ventilation device for a room, such as a building, with a dual-flow unit, which comprises a system capable of creating a cooling flow in the electronic box without altering the machine aeraulic efficiency. and maintaining the overall thermal efficiency of the plant as much as possible.

To this end, the subject of the invention is a device for ventilation of a room, such as a building, comprising a box provided with an inlet of an air flow and an outlet of said air flow. , the air flow coming from outside the room and going to the room, or coming from the room and going outside the room, the ventilation device being configured so that the said air flow circulates in the room box between said input and said output, the box comprising at least one housing, called an electronic box, of at least one electronic component and an internal element separate from the housing, the internal element being shaped to be crossed by a first part of the flow of air, called main flow, and the housing being shaped to be traversed by a second part of the air flow, called bypass flow, so as to cool said at least one electronic component of the housing.

Thus, thanks to the device according to the present invention, the bypass flow enters the electronic box, where it cools the electronic component or components. In addition, this bypass flow exits entirely from the cabinet and joins the main flow before exiting the ventilation device, which allows the maintenance of the air flow between the inlet and the outlet of the device and therefore the overall airflow efficiency of the ventilation device is not impaired. In addition, the device according to the present invention does not require the installation of any dedicated cooling system, which avoids additional manufacturing costs and reduces the size of the device.

According to another feature of the invention, the housing comprises at least one bypass flow inlet and one bypass flow outlet.

According to another characteristic of the invention, the inlet orifice is arranged upstream of the internal element and the outlet orifice is arranged downstream of the internal element.

According to another characteristic of the invention, at least one of the inlet or outlet orifices is provided with a waterproof and air-permeable membrane.

According to another characteristic of the invention, the ventilation device comprises means for regulating the flow rate of the bypass air flow in at least one of the inlet orifice and the outlet orifice.

According to another characteristic of the invention, said internal element is a heat exchanger and/or a filter and/or an air dehumidifier.

According to another characteristic of the invention, the heat exchanger is a gaseous fluid/gaseous fluid exchanger or a liquid fluid/gaseous fluid exchanger.

According to another characteristic of the invention, the ventilation device comprises at least one motor-turbine unit.

According to another characteristic of the invention, said motor-turbine unit is arranged upstream of the housing and of the internal element or downstream of the housing and of the internal element.

According to another characteristic of the invention, the box comprises an inlet for a second air flow and an outlet for a second air flow, the device being shaped to be traversed by said second air flow between said second air inlet and said second air outlet.

According to another characteristic of the invention, the internal element is a heat exchanger shaped to heat exchange the main flow and the second flow of air.

According to another characteristic of the invention, the ventilation device comprises a deflection channel and a closure means mounted movable between a closure position of the internal element and a closure position of said deflection channel.

According to another characteristic of the invention, the housing and the deflection channel are arranged so as to be supplied with fresh air.

According to another characteristic of the invention, the ventilation device comprises a device for filtering the flow of fresh air, preferably placed in the entrance.

Other characteristics, details and advantages of the invention will appear on reading the description which follows. This is purely illustrative and must be read in conjunction with the appended drawings on which:

There illustrates a perspective view of a room ventilation device according to a first embodiment of the present invention, comprising a heat exchanger and an electronic box;

There illustrates a perspective view of the ventilation device of FIG. 1 according to an alternative embodiment;

There illustrates a schematic view in longitudinal section of the ventilation device of FIG. 1 according to a second embodiment; And

There illustrates a schematic view in longitudinal section of the ventilation device of FIG. 3 according to an alternative embodiment.

In the rest of the description, identical elements or identical functions bear the same reference sign. For the sake of conciseness of this description, these elements are not described in detail in each embodiment. On the contrary, only the differences between the variant embodiments are described in detail.

FIG. 1 represents a perspective view of a ventilation device 1 of a room L. By room is meant any room or set of rooms of an individual or collective building.

The invention is now described in a first embodiment with reference to Figures 1 and 2, which relates to a so-called "dual flow" ventilation device, as will be explained below.

As can be seen from these figures, the device 1 comprises a box 2 provided with a first inlet 3 for a flow of fresh air F into the device 1 and a first outlet 4 of said flow of fresh air F out of the device 1.

By fresh air flow F is meant an air flow coming from outside the room L and intended to enter the room L via the device 1.

As also apparent from Figures 1 and 2, the device 1 comprises a second inlet 5 of a flow of stale air F' and a second outlet 6 of said flow of stale air F'.

By flow of stale air F' is meant a flow of air coming from the room L and intended to be extracted from it to the outside via the device 1.

The ventilation device 1 comprises a motor-turbine unit 7 thanks to which the circulation of the fresh air flow F is maintained in the device 1 between the first inlet 3 and the first outlet 4. The motor-turbine unit 7 is called a fan. insufflation in the following description.

Thus, the fresh air flow F flows in the box 2 from the first inlet 3 to the first outlet 4, through which the flow F enters the room L to be ventilated.

The ventilation device 1 also comprises a motor-turbine unit 8 thanks to which the circulation of the stale air flow F′ is maintained in the device 1 between the second inlet 5 and the second outlet 6. The motor-turbine unit 8 is called exhaust fan in the following description.

Thus, the stale air flow F' flows into the box 2 from the second inlet 5, through which the air flow F' is extracted from the room L, to the second outlet 6 where the flow F' is released outside.

Device 1 includes an internal element 9, which is a heat exchanger in Figures 1 and 2.

The heat exchanger 9 allows heat exchanges between the fresh air flow F and the stale air flow F' in order to cool the fresh air flow F in summer and to heat it up in winter, before it enters the the room L.

The heat exchanger 9 generates pressure drops, which contributes to the cooling (which allows the bypass flow to exist and has the effect of creating cooling), of an electronic box detailed later.

Nevertheless, the internal element 9 is not limited to a heat exchanger and can take the form of a filter or an air dehumidifier which also generates pressure drops. Of course, the invention is not limited to a single internal element, and the device may comprise a plurality of internal elements 9.

As also visible in Figures 1 and 2, the device 1 comprises a housing 10 in the form of an electronic box comprising electronic components 11 such as frequency converters, electronic cards, motors, etc ... as well as a cooling means electronic components 11, detailed later.

The ventilation device 1 also comprises a deflection channel 12 provided with a flap 13 driven for example by a servomotor (not shown).

The flap 13 is mounted to move between a closed position of the exchanger 9 and a closed position of the deflection channel 12.

In the closed position of the exchanger 9, the fresh air flow F does not cross the exchanger 9 while at least part of the flow F, referenced FD for deflection flow, circulates in the channel 12. In the closed position of the deflection channel 12 (illustrated in Figures 1 and 2), the air flow F does not circulate in the channel 12 while at least part of the flow F passing through the exchanger 9.

In FIG. 1, the electronic box 10 has a generally parallelepipedic shape delimited in particular by an opposite front wall 14 and a rear wall 15 .

As visible in Figure 1, a lower part 16 of the anterior wall 14 is pierced with at least one inlet orifice 17. Similarly, an upper part 18 of the rear wall 15 is pierced with at least one orifice output 19.

In Figure 1, there are illustrated two inlet orifices 17 in the form of slots and two outlet orifices 19 also in the form of slots.

The set of inlet orifices 17 and outlet orifices 19 form the means of cooling the electronic components 11.

It is noted that the inlet orifices 17 are arranged upstream of the exchanger 9 and the outlet orifices 19 are arranged downstream of the exchanger 9.

Due to the pressure drops created by the exchanger 9, a fraction of the fresh air flow F, referenced FC, for bypass flow, bypasses the exchanger 9 and enters the housing 10 through the orifice(s) input 17 while another fraction of the fresh air flow F, referenced FP, for main flow, passes through the exchanger 9.

The FC air flow passes through the electronic box 10 to the outlet orifice or orifices 19, allowing the components 11 to be cooled.

Advantageously, the flow rate of the air flow FC in the cabinet 10 is less than or equal to 50% of the total flow rate of the air flow F, or even less than or equal to 20%, or less than or equal to 10%, preferably less or equal to 5% of the total flow rate of the air flow F, in order to maintain the overall thermal efficiency of the ventilation device 1.

For example, for a 1500 m ³ /h ventilation device, the set value is 15m ³ /h, or 1%.

In addition, the air flows FC and FP, and possibly the deflection flow FD, recombine in the blower fan 7, making it possible to recover all of the fresh air flow F upstream of the first outlet 4 and not to alter the aeraulic performance of device 1.

In FIG. 2, the electronic box 10 comprises a lower compartment 10-1 and an upper compartment 10-2. The upper compartment 10-2 contains the electronic components 11 to be cooled.

As seen in Figure 2, the upper compartment 10-2 is placed between the supply fan 7, and the extraction fan 8, above the lower compartment 10-1 and the heat exchanger 9.

The lower compartment 10-1 is pierced with two inlet orifices 17 at the level of the front wall 14 of the electronic box 10 and the upper compartment 10-2 is pierced with an outlet orifice 19 at the level of the rear wall 15 of the electronic box 10. Of course, the invention is not limited to this number of inlet and outlet orifices.

The upper compartment 10-2 is provided with two orifices 20, respectively connected to one of the inlet orifices 17 of the lower compartment 10-1 by a connection duct 21.

Thanks to this configuration, it is possible to effectively cool the electronic components 11 of the upper compartment 10-2 although these are remote from the inlet orifices 17 of the electronic box 10.

Thus, the air flow FC enters the electronic box 10 through the inlet orifices 17 then circulates in the connection ducts 21 and crosses the upper compartment 10-2 where it cools the electronic components 11 before leaving the housing 10 through the outlet orifices 19. The air flow FC then recombines with the air flow FP, and possibly the deflection flow FD, in the blowing fan 7, making it possible to recover the entire flow of fresh air F upstream of the first outlet 4 and not to alter the aeraulic efficiency of the device 1, as already described in relation to figure 1.

The invention is now described in a second embodiment with reference to Figures 3 and 4, which relates to a so-called "simple flow" ventilation device.

As visible in these figures, the ventilation device 1 comprises a single motor-turbine unit, which corresponds to the blower fan 7. The ventilation device 1 also comprises a horn 22, known to those skilled in the art, placed upstream of the blower fan 7, making it possible in particular to concentrate the fresh air flow F before it arrives in the blower fan 7 and to reduce air recirculation.

In Figure 3, the bell 22 and the blower fan 7 are positioned downstream of the internal element 9 and the housing 10.

According to the variant embodiment shown in Figure 4, the bell 22 and the blower fan 7 are positioned upstream of the internal element 9 and the housing 10.

Preferably, according to this embodiment, the internal element 9 is a liquid/air fluid heat exchanger. Nevertheless, as already described, the invention is not limited to this type of exchanger, and it is possible to envisage a gaseous fluid/gaseous fluid exchanger, or even a filter or an air dehumidifier.

As already described in relation to Figures 1 and 2, the housing 10 is pierced with at least one inlet orifice 17, placed upstream of the internal element 9 and which allows the entry of the air flow FC in the housing 10. The housing 10 is also pierced with at least one outlet orifice 19, placed downstream of the internal element 9 and which allows the flow FC to exit from the housing 10.

Of course, the invention is not limited to the exemplary embodiments described with reference to FIGS. 1 to 4 and other embodiments will appear clearly to those skilled in the art.

According to a variant not shown, the inlet and/or outlet orifices 17, 19 are advantageously provided with a membrane that is impermeable to water and permeable to air, which makes it possible to avoid contact between water contained in the air of the FC bypass flow and the electronic components 11.

According to another variant not shown, the inlet and/or outlet orifices 17, 19 are provided with devices for regulating the flow of air of the bypass flow FC, such as pivoting dampers mounted movable between a position of complete opening of the associated orifice and a position of complete closure of the associated orifice. This variant is particularly advantageous when the deflection channel is open and you want to adjust the orifice sizes in order to continue to cool the electronic box.

It is noted that, preferably, the ventilation device 1 comprises an air filter installed in the first inlet 3, in order to purify the fresh air F. Thanks to the filter, the deflection air FD is as free as possible of dust, whose presence could be harmful to the electronic components 11.

It is also noted from the preceding description that the electronic box 10 and the deflection channel 12 are supplied with fresh air, which ensures better operation of the ventilation device 1 in the event of a fire.

It is noted that the embodiments described, illustrated or not, can be combined insofar as they are not incompatible.

As already apparent from the preceding description, the ventilation device 1 according to the present invention provides effective cooling of the electronic components 11 positioned within the housing 10 without altering the aeraulic efficiency of the device 1, while maintaining maximum thermal efficiency. overall and reducing the size of the ventilation device 1 compared to the devices of the prior art.

Claims (14)

Device for ventilation of a room (L), such as a building, comprising a box (2) provided with an inlet (3) of an air flow (F) and an outlet (4) of said air flow (F), the air flow (F) coming from outside the room (L) and destined for the room (L), or coming from the room (L) and destined for the outside of the room (L), the ventilation device being configured so that the said air flow (F) circulates in the box (2) between the said inlet (3) and the said outlet (4), the box (2) comprising at least a housing (10) of at least one electronic component (11) and an internal element (9) separate from the housing (10), characterized in that the internal element (9) is shaped to be crossed by a first part of the air flow (F), called main flow (FP), and the housing (10) is shaped to be crossed by a second part of the air flow (F), called bypass flow (FC), so as to cooling said at least one electronic component (11) of the housing (10). Device according to Claim 1, in which the housing (10) comprises at least one bypass flow (FC) inlet (17) and one bypass flow (FC) outlet (19). Device according to the preceding claim, in which the inlet orifice (17) is arranged upstream of the internal element (9) and the outlet orifice (19) is arranged downstream of the internal element (9) . Device according to one of Claims 2 or 3, in which at least one of the inlet or outlet orifices (17, 19) is provided with a waterproof and air-permeable membrane. Device according to one of Claims 2 to 4, comprising means for regulating the flow rate of the bypass air flow (FC) in at least one of the inlet orifice (17) and of the exit (19). Device according to one of the preceding claims, wherein said internal element (9) is a heat exchanger and/or a filter and/or an air dehumidifier. Device according to the preceding claim, in which the heat exchanger is a gaseous fluid/gaseous fluid exchanger or a liquid fluid/gaseous fluid exchanger. Device according to one of the preceding claims, comprising at least one motor-turbine unit (7, 8). Device according to the preceding claim, in which said motor-turbine unit (7) is arranged upstream of the housing (L) and of the internal element (9) or downstream of the housing (L) and of the internal element (9 ). Device according to one of the preceding claims, in which the box (2) comprises an inlet (5) for a second air flow (F') and an outlet (6) for a second air flow (F '), the device being shaped to be traversed by said second air flow (F') between said second air inlet (5) and said second air outlet (6). Device according to the preceding claim, in which the internal element (9) is a heat exchanger shaped to heat exchange the main flow (FP) and the second flow of air (F'). Device according to one of the preceding claims, comprising a deflection channel (12) and a closure means (13) mounted to move between a closure position of the internal element (9) and a closure position of said channel deviation (12). Device according to the preceding claim, in which the housing (10) and the deflection channel (12) are arranged so as to be supplied with fresh air. Device according to one of the preceding claims, comprising a device for filtering the flow of fresh air (F), preferably arranged in the inlet (3).