BE1029481B1 - Air cleaning device - Google Patents

Abstract

An air cleaning device includes (1) at least one electrical power source; (2) at least one ionizer connected to the power source; (3) at least one filter downstream of the ionizer; and (4) at least one fan 2 to ensure the flow of air from the ionizer to the catalyst which comprises a substantially cylindrical inlet pipe (3) along a first axis (X); which inlet pipe (3) is capped with a bell (1) comprises: i) a first ring (4) substantially of revolution around a second axis (Y) substantially coinciding with the first axis (X) and having a curved transverse section (5) widening away from the fan (2), substantially parallel to the second axis (Y) in the proximal part (6) and substantially perpendicular to the second axis (Y) in the distal part (7), the proximal part (6) forming a first substantially cylindrical lip (8) along the second axis (Y), of diameter slightly smaller than the diameter of the inlet pipe (3) in order to be able to be inserted into the inlet pipe (3); and ii) a second ring (9) substantially of revolution around the second axis (Y), assembled to the first ring (4) in leaktight manner, and forming a second lip (10), substantially parallel to the first lip (8) , of diameter slightly greater than the diameter of the inlet pipe (3) in order to be able to cap the inlet pipe (3).

Description

Air cleaning device

Technical area

The invention relates to an air purification device comprising a specific pavilion for a fan.

Prior technique

[0002] The inventors have previously developed a device of reduced size intended for particularly effective air purification and described in international application PCT/EP2022/052715.

Now, and despite the effectiveness of this device, it turned out that its operation could generate parasitic vibrations.

Summary of the invention

[0004] The inventors have now demonstrated that the addition, to the fan of the device, of a specific horn, made it possible to eliminate these parasitic vibrations.

[0005] Consequently, the subject of the invention is an air purification device which comprises:

[0006] A) at least one electric power source;

B) at least one filter;

C) at least one fan 2 () to ensure the flow of air within the device which comprises an inlet pipe (3) substantially cylindrical along a first axis (X);

[0009] Where the fan (2) comprises a pavilion (1) arranged on the inlet pipe (3) of said at least one fan (2), which pavilion (1) comprises:

[00010] I) a first ring (4) substantially of revolution around a second axis (Y) substantially coinciding with the first axis (X) and having a curved transverse section (5) widening away from the fan (2), substantially parallel to the second axis (Y) in the proximal part (6) and substantially perpendicular to the second axis (Y) in the distal part (7), the proximal part (6) forming a first lip (8) substantially cylindrical along the second axis (Y), with a diameter slightly smaller than the diameter of the inlet pipe (3) in order to be able to fit into the inlet pipe (3); And

[00011] II) a second ring (9) substantially of revolution around the second axis (Y), assembled to the first ring (4) in a sealed manner, and forming a second lip (10), substantially parallel to the first lip ( 8), of diameter slightly greater than the diameter of the inlet pipe (3) in order to be able to cap the inlet pipe (3).

[00012] Typically, the device according to the invention will take the form of a prism, preferably a right prism.

The structural elements of the device according to the invention (eg walls) are made of metal, plastic or composite.

[00014] As regards the nature of b) at least one filter, it may consist of one or more porous, fibrous, granular materials or mixtures thereof. Preferably, said at least one filter is made of fibrous material such as fiberglass and polytetrahydrofluoroethyl (PTFE) and, particularly preferably, of PTFE. Said at least one filter is such that it allows a filtration greater than or equal to 99.99% of the particles having a diameter greater than or equal to 0.3 μm. Preferably, said at least one filter is a high-efficiency air filter of the HEPA type. By HEPA filter is meant a filter capable of filtering, in one pass, at least 99.97% of the particles with a diameter greater than or equal to 0.3 μm. Now, said at least one filter may or may not be formed from a superposition of several layers of the same material or of different materials. Said at least one filter has a sufficient thickness to allow effective air filtration. Typically, said at least one filter has a thickness equal to or greater than 3 mm, preferably equal to or greater than 5 mm and, even more preferably, equal to or greater than 8 MM. Note that the surface of said at least one filter may be flat or have multiple folds (V) so as to increase the contact surface.

Advantageously, the device according to the invention further comprises a prefilter upstream of the fan (2). Typically, this prefilter is made of a flexible alveolar material of the foam type. This prefilter allows the filtration of 90 to 100% of particles with a diameter greater than or equal to 5.0um. This prefilter may include activated carbon so as to be able to capture the volatile organic compounds (VOC) present in the air.

[00016] According to a preferred embodiment, the device according to the invention has a base which may comprise pads, feet or end pieces allowing it not to be in direct contact with the surface on which it is placed or fixed, at least four side walls, and a height between 250 mm and 900 mm, a width between 200 mm and 700 mm and a depth between 300 mm and 600 mm; which device comprises: [0001 7] B) at least one filter included within each of the at least four side walls of the device, which at least one filter occupies at least 70% of the total surface of the side wall on which it is is preferably at least 80% and particularly preferably at least 90% of the total area of the side wall on which it is located; And

[00018] C) at least one fan (2) to ensure the flow of air to each of the filters with an operating flow rate of between 400 and 3000 m3/h, preferably between 500 and 2200 m3/h .

Advantageously, the air purification device according to the invention further comprises d) at least one ionizer connected to the power source and downstream of the fan (2). Preferably, the air purification device according to the invention further comprises e) at least one catalyst downstream of the ionizer and b) at least one filter, which catalyst allows the decomposition of ozone.

The device (1) according to the invention is capable, despite very small dimensions (maximum height: 900 mm, maximum width: 700 mm, maximum depth: 600 mm), of effectively purifying the air in a room while also being extremely discreet due to the silent operation associated with its improved efficiency.

[000211] Advantageously, a device (1) according to the invention will have a height of between 300 mm and 800 mm, a width of between 300 mm and 600 mm, and a depth of between 400 and 500 mm.

[00022] Also advantageously, the first ring (4) has a circular transverse section, preferably according to a quarter circle.

Finally, advantageously, the second ring (9) is cylindrical.

Brief description of the drawings

The invention will be better understood on reading the following description, given solely by way of example, and with reference to the appended figures in which:

[00025] [Fig. 1] shows, in cut side view, a fan and a roof as used in the previous air cleaning device.

[00026] [Fig. 2] shows, in perspective view, a roof as used in the previous air purification device,

[00027] [Fig. 3] shows, in cut side view, a fan and a roof as used in the air purification device according to the invention.

[00028] [Fig. 4] shows, in perspective view, a roof as used in the air purification device according to the invention.

[00029] [Fig. 5] shows, in cut profile view, a roof as used in the air purification device according to the invention.

Description of embodiments

[00030] With reference to FIG. 1, a fan 2 according to the prior art is represented in longitudinal sectional view along a plane passing through the first axis X, axis of rotation of the fan 2. The operation of the fan 2 is such that the air is drawn in through the inlet, above in the plane of the figure, and expelled through the outlet, below in the plane of the figure.

[00031] The inlet of the fan 2 has an inlet pipe 3, substantially cylindrical with axis the first axis X.

[00032] The invention relates to a pavilion 1 for a fan 2, capable of being mounted at the inlet of the fan 2, in front of and on the inlet pipe 3.

The pavilion 1 has a flared shape as one moves away from the fan 2, or a shape that narrows as one approaches the fan 2. Thus, a pavilion 1 concentrates the incoming air flow in fan 2. Its smooth and continuous section facilitates the entry of air into fan 2.

[00033] It is known to use such a horn 1 according to the prior art at the inlet of a fan 2. Such a horn 1 comprises, as more particularly illustrated in FIG. 2, conventionally a ring substantially of revolution around a second Y axis. The second Y axis merges with the first X axis when the horn 1 is in place at the inlet of the fan 2.

[00034] Such a flag 1 preferably has a transverse section 5, that is a section according to a plane passing through the second axis Y, widening as one moves away from the fan 2. Thus the flag 1 forms a funnel concentrating the airflow entering the inlet duct 3.

[00035] The transverse section 5 is generally continuous. It can be curved, preferably circular. As illustrated, it is still preferably according to a quarter circle.

[00036] According to the illustrated embodiment, the transverse section 5 is parallel to the second axis Y in the proximal part 6, namely as close as possible to the fan 2 and its inlet pipe 3 and the transverse section 5 is perpendicular to the second axis Y in the distal part 7, namely furthest from the fan 2. Thus, the proximal part 6 forms a first lip 8, substantially cylindrical along the second axis 7, of diameter slightly less than the diameter of the inlet pipe 3. Thus when the pavilion 1 is in place at the inlet of the fan 2, the first lip 8 is inserted into the inlet pipe 3.

[00037] It appeared that the previous air purification device could generate vibrations liable to disturb users. After various attempts, these vibrations were eliminated after adding to the fan 2, a horn 1 as shown in Figures 3, 4 and 5.

[00038] It therefore seems that the vibrations within the previous air purification device resulted from parasitic circulation at the interface between the roof 1 and the inlet pipe 3 of the fan 2. This parasitic circulation probably corresponded to a re-suction of the air at the outlet of the fan 2 which returns to the inlet of the fan through the interface between the pavilion 1 and the inlet duct 3.

In the air purification device according to the invention, the horn 1 comprises, like a horn 1 used in the previous air purification device, a first ring 4 substantially of revolution around the second axis Y. This pavilion 1 has a curved transverse section 5, preferably circular, more preferably according to a quarter circle, widening away from the fan 2, substantially parallel to the second axis Y in the proximal part 6 and substantially perpendicular to the second axis Y in the distal part 7. The proximal part 6 forms a first substantially cylindrical lip 8 along the second axis Y, of diameter slightly less than the diameter of the inlet pipe 3. Thus, when the flag 1 is placed place on the inlet pipe of the fan 2, the first lip 8 is inserted into the inlet pipe 3.

[00040] Now, the pavilion 1 of the air purification device according to the invention further comprises a second ring 9 substantially of revolution around the second axis Y. This second ring 9 is assembled to the first ring 4 in a sealed manner. Thus, at the level of "assembly between the two rings 4, 9, no air circulation can occur between the two rings 4, 9. The second ring 9, at its proximal end forms a second lip 10. This second lip 10 is substantially parallel to the first lip 8. It has a diameter slightly greater than the diameter of the inlet pipe 3 in order to be able to cover the inlet pipe 3. Thus the first lip 8 is inserted into the inlet pipe 3 from the inside, while the second lip 10 surrounds and caps the inlet pipe 3 from the outside.The interface thus created between the roof 1 and the inlet pipe 3 forming a baffle opposes a air circulation between the interior and exterior of the pavilion 1 and thus makes it possible to put an end to this parasitic air circulation.

[00041] Finally, it has been demonstrated that this interface, which makes it possible to eliminate parasitic vibrations, also allows an average gain of 4.5% in additional flow circulating between the pavilion 1 and the fan 2, thanks to the elimination of circulations parasites.

[00042] Such a pavilion can be made of metal, plastic or composite.

[00043] According to another feature, as seen in Figures 3 and 4, the second ring 9 is cylindrical. Such a shape simplifies the production of the second ring 9 and its assembly, typically by welding or during molding, on the first ring 4, in order to produce the bell 1 according to the invention.

[00044] A pavilion 1 is dimensioned according to the diameter of the inlet pipe 3 of the fan 2. According to a first model of fan 2, the diameter of the inlet pipe 3 is 250 mm. It follows that the diameter of the flag 1 is substantially equal to 250 mm. The first lip 8 has a diameter slightly less than 250 mm, namely 250 - 5 to 10 mm, while the second lip 10 has a diameter slightly greater than 250 mm, namely 250 + 5 to 10 mm.

[00045] According to another fan model 2, the diameter of the inlet pipe 3 and therefore the nominal diameter of the flag 1 can be lower or higher. || can thus be equal to 280 mm or even 310 mm, etc.

The invention has been illustrated and described in detail in the drawings and the preceding description. This must be considered as illustrative and given by way of example and not as limiting the invention to this description alone. Many variant embodiments are possible.

List of reference signs 1: auricle, 2: ventilator, 3: inlet channel, 4: 1st ring, 5: transverse section, 6: proximal portion, 7: distal portion, 8: 1st lip, 9: 2nd ring, 10: 2nd lip,

X: 1st axis,

Y: 2nd axis.

Claims (7)

Claims 1. An air cleaning device which comprises: a) at least one electrical power source; b) at least one filter; Cc) at least one fan (2) to ensure the flow of air within the device which comprises a substantially cylindrical inlet pipe (3) along a first axis (X); characterized in that the fan (2) comprises a horn (1) disposed on the inlet duct (3) of said at least one fan (2), which horn (1) comprises: i) a first ring (4) substantially of revolution around a second axis (Y) substantially coincident with the first axis (X) and having a curved transverse section (5) widening away from the fan (2), substantially parallel to the second axis (Y) in the proximal part (6) and substantially perpendicular to the second axis (Y) in the distal part (7), the proximal part (6) forming a first lip (8) substantially cylindrical along the second axis (Y), of diameter slightly smaller than the diameter of the inlet pipe (3) in order to be able to fit into the inlet pipe (3); and ii) a second ring (9) substantially of revolution around the second axis (Y), assembled to the first ring (4) in leaktight manner, and forming a second lip (10), substantially parallel to the first lip (8) , of diameter slightly greater than the diameter of the inlet pipe (3) in order to be able to cap the inlet pipe (3). 2. The air purification device according to claim 1, characterized in that it has: ° a base which may include pads, feet or end caps allowing it not to be in direct contact with the surface on which it is placed or fixed; ° at least 4 side walls; and ° a height of between 250 mm and 900 mm, a width of between 200 mm and 700 mm and a depth of between 300 mm and 600 mm and what it includes: b) at least one filter included within each of the at least four side walls of the device, which at least one filter occupies at least 70% of the total surface of the side wall on which it is located; and C) at least one fan (2) to ensure the flow of air to each of the filters with an operating flow rate between 400 and 3000 m3/h. 3. The air purification device according to any one of the preceding claims, characterized in that it comprises d) at least one ionizer connected to the power source and downstream of the fan (2). 4. The air purification device according to the preceding claim, characterized in that it further comprises e) at least one catalyst downstream of d) the at least one ionizer and b) at least one filter, which catalyst allows the decomposition of ozone. 5. The air purification device according to any one of the preceding claims, characterized in that the second ring (9) of the roof (1) is cylindrical. 6. The air purification device according to any one of the preceding claims, characterized in that the first ring (4) of the roof (1) has a circular cross section. 7. The air purification device according to the preceding claim, wherein the first ring (4) of the flag (1) has a section according to a quarter circle.