FR3063246A1 - CIRCULATION CHANNEL OF AN AIR FLOW, IN PARTICULAR A HEATER, VENTILATION AND / OR AIR CONDITIONING APPARATUS FOR A MOTOR VEHICLE - Google Patents

Abstract

The invention relates to a channel (12) for circulating a flow of air (F), in particular a heating, ventilation and / or air-conditioning apparatus for a motor vehicle comprising a detection sensor (38) of a air flow parameter (F) characterized in that said channel (12) for circulating an air flow (F) further comprises stabilization means in the form of a stabilization chamber (16) air flow disposed upstream of said sensor (38) for detecting a parameter of the air flow (F) in the direction of flow of said air flow (F). The invention also relates to a heating, ventilation and / or air conditioning apparatus for a motor vehicle comprising such a channel (12).

Description

063 246

51582 ® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY © Publication number:

(to be used only for reproduction orders)

©) National registration number

COURBEVOIE © Int Cl ⁸ : B 60 H 1/00 (2017.01), B 60 H 3/06, F24 F 13/08, G 01 N 15/06

A1 PATENT APPLICATION

©) Date of filing: 27.02.17. © Applicant (s): VALEO THERMAL SYSTEMS (30) Priority: Simplified joint stock company - FR. @ Inventor (s): DESMAUTS PAULINE, GLAVATS- KAYA YULIA, RIVET GILLES and AUBAS BENOIT. (43) Date of public availability of the request: 31.08.18 Bulletin 18/35. ©) List of documents cited in the report preliminary research: Refer to end of present booklet (© References to other national documents ® Holder (s): VALEO THERMAL SYSTEMS related: Joint stock company. ©) Extension request (s): © Agent (s): VALEO THERMAL SYSTEMS.

AIR FLOW CIRCULATION CHANNEL, PARTICULARLY A HEATING, VENTILATION AND / OR AIR CONDITIONING APPARATUS FOR A MOTOR VEHICLE.

FR 3 063 246 - A1

The invention relates to a channel (12) for circulation of an air flow (F), in particular for a heating, ventilation and / or air conditioning device for a motor vehicle, comprising a detection sensor (38) of a air flow parameter (F) characterized in that said channel (12) for circulation of an air flow (F) further comprises a stabilization means produced in the form of a stabilization chamber (16) of the air flow disposed upstream of said detection sensor (38) of an air flow parameter (F) in the direction of flow of said air flow (F).

The invention also relates to a heating, ventilation and / or air conditioning apparatus for a motor vehicle comprising such a channel (12).

The invention relates to a circulation channel for an air flow.

The invention relates more particularly to a channel for circulation of an air flow for a heating, ventilation and / or air conditioning device for a motor vehicle comprising a sensor for detecting a parameter of this air flow.

Circulation channels are known for heating, ventilation and / or air conditioning apparatus of a motor vehicle comprising a sensor for detecting a parameter of this air flow. However, given the turbulence that can be caused during the flow of air flow in the circulation channel, it can be complicated to establish a reliable measurement by the sensor detecting a parameter of this flow d 'air.

The object of the invention is to remedy this drawback.

To this end, the invention provides a channel for circulation of an air flow, in particular a heating, ventilation and / or air conditioning device for a motor vehicle, the channel for circulation of the air flow comprising a sensor. for detecting an air flow parameter and an air flow stabilization means produced in the form of a stabilization chamber disposed upstream of the sensor for detecting an air flow parameter in the direction circulation of this air flow.

Thus, the presence of this stabilization chamber will make it possible to take off part of the air flow circulating in the circulation channel so as to create a so-called secondary air flow which will have a uniform speed over at least part of the stabilization so as to establish an accurate measurement of the air flow parameter.

The invention also relates to a heating, ventilation and / or air conditioning device for a motor vehicle comprising at least one air flow circulation channel.

Specific embodiments provide, alone or in combination, that:

- said stabilization chamber is delimited by walls and comprising an inlet called a precaptor inlet in which a part of said air flow known as secondary air flow circulates,

- said sensor for detecting an air flow parameter is provided at least in part in said stabilization chamber,

- provision is made for driving said secondary air flow, in particular a fan,

said sensor for detecting an air flow parameter is a particulate matter detection sensor, in particular a particulate matter detection sensor for particulate matter smaller than 2.5 μm in diameter, and,

- said particulate matter detection sensor has at least one inlet, one outlet, a particulate matter measurement chamber, said inlet of the particulate matter detection sensor and said outlet of the particulate matter detection sensor being disposed adjacent to each other to each other and said inlet being traversed by at least said secondary air flow.

The invention also relates to a heating, ventilation and / or air conditioning device for a motor vehicle comprising at least one channel as previously described.

Other characteristics and advantages of the invention will emerge on reading the description which follows, with reference to the appended figure, which illustrates a schematic representation of a circulation channel according to the invention.

A channel 12 for circulation of an air flow F comprises a sensor 38 for detecting a parameter of the air flow F. The circulation channel 12 is further provided with an inlet and an outlet not shown here.

According to the invention, the channel 12 for circulation of the air flow F also comprises a stabilization means produced in the form of a chamber 16 for stabilizing the air flow F. The chamber is arranged upstream of the detection sensor 38 of the air flow parameter F in the direction of circulation thereof.

The circulation channel 12 is advantageously a channel of a heating, ventilation and / or air conditioning device for a motor vehicle. The expression heating, ventilation and / or air conditioning apparatus for a motor vehicle is understood to mean an apparatus capable of regulating the aerothermal parameters of an air flow distributed towards the interior of a passenger compartment of a motor vehicle and which generally comprises a housing. delimited by partitions in which openings are made, including at least one air inlet and at least one air outlet connected by a circulation channel.

The housing of the heating, ventilation and / or air conditioning unit houses a blower for the circulation of the air flow from the air inlet to the air outlet. The housing also houses heat treatment means for heating and / or cooling the air flow prior to its distribution inside the passenger compartment. By way of example, the heat treatment means can comprise an evaporator which is intended to cool and dehumidify the air flow passing through it, as well as a radiator, possibly associated with an additional electric type radiator, which is intended for warm the air flow passing through it.

The housing of the heating, ventilation and / or air conditioning unit can also be fitted with a filter for filtering the air entering the passenger compartment so as to ensure that the occupants of the motor vehicle have good air quality. . To do this, a filter is usually provided located upstream of the air outlet opening into the passenger compartment. In particular, the filter may be placed in the housing of the heating, ventilation and / or air conditioning device between the blower and the heat treatment means such as, for example, the evaporator.

In the embodiment illustrated in FIG. 1, the stabilization chamber 16 is arranged in the channel 12 for circulation of the air flow F and is delimited by walls 34 and comprises an inlet known as a precaptor inlet 21.

The stabilization chamber 16 makes it possible to divert a part of the air flow F circulating in the circulation channel 12. In the following description, the part of the air flow F circulating in the stabilization chamber 16 will be called flow d 'secondary air F'.

The stabilization chamber 16 thus makes it possible to take off part of the air flow F flowing in the circulation channel 12 so that the secondary air flow flowing in this stabilization chamber 16 has a uniform speed over at least one part of the stabilization chamber 16. This uniform speed makes it possible to establish a precise measurement of the air flow parameter F by the detection sensor 38.

In other words, the stabilization chamber 16 takes a part of the air flow circulating in the circulation channel 12 so as to separate from a part of this air flow F. This separation allows stabilization of the secondary air flow F '. In particular, following the entry of the secondary air flow F 'by the precaptor inlet 21, turbulence T will be created, the secondary air flow F' thus sees its speed decrease until reaching a uniform speed on at least part of the stabilization chamber, part in which is placed the sensor 38 for detecting an air flow parameter F. In addition, the presence of the stabilization chamber allows the air flow to be mixed secondary F '.

The stabilization chamber 16 also has an outlet through which the secondary air flow F ′ returns to the air flow F circulating in the circulation channel 12.

In this embodiment, the detection sensor 38 of the air flow parameter F is provided at least in part in the stabilization chamber 16.

In the example shown in Figure 1, the detection sensor 38 of the air flow parameter F comprises a part in the stabilization chamber 16 and a part projecting from the circulation channel 12. Such an arrangement allows access to the detection sensor 38 of the parameter of the air flow F through the exterior of the circulation channel 12. In a preferred embodiment, the channel is integrated into a housing of the heating, ventilation and / or air conditioning apparatus. Thus, the detection sensor 38 of the air flow parameter F is accessible from the outside of the housing of the heating, ventilation and / or air conditioning apparatus, thus allowing easy replacement of the detection sensor 38 of the air flow parameter 'air F.

Here, the detection sensor 38 of an air flow parameter F is secured to the wall of the circulation channel 12 by a fastening system 36.

There is further provided a seal 40 interposed between the detection sensor 38 of an air flow parameter F and the wall of the wall of the circulation channel 12 so as to guarantee the absence of leakage of air.

Another embodiment not shown provides, for its part, a detection sensor 38 of a parameter of the flow of air F provided offset relative to the stabilization chamber 16. In such a case, a conduit allowing a tapping of the secondary air flow F 'to the detection sensor 38 of an air flow parameter F is provided between the stabilization chamber 16 and the detection sensor 38 of the air flow parameter F.

The stabilization chamber 16 may be equipped with a means for driving the secondary air flow F ’, in particular a fan or a pump. A particular embodiment proposes that this fan be integrated into the detection sensor 38 of an air flow parameter F.

An advantageous embodiment of the invention proposes that the detection sensor 38 for an air flow parameter F either is a particulate matter detection sensor 14 and in particular a particulate matter detection sensor smaller than sizes 10 µm in diameter and preferably less than 2.5 µm in diameter.

By particulate matter is meant any particle of sufficiently small size, in general of size less than 10 μm to be transported by air and to be inhaled.

A particulate matter detection sensor 14 could, for example, comprise comprises at least one inlet 18, one outlet 20, a measurement chamber 32 of the particulate matter.

It will be noted that in the example illustrated in FIG. 1, part of the particulate matter detection sensor 14 is inserted into the stabilization chamber 16. This is the part of the particulate matter detection sensor 14 comprising the inlet 18 and outlet 20. In addition, the particulate matter measurement chamber 32 of the particulate matter detection sensor 14 is arranged outside of the stabilization chamber 16, that is to say outside of the overall dimensions of the circulation channel 12.

In a preferred embodiment and not illustrated, the particulate matter detection sensor 14, here its part comprising the measurement chamber 32, is accessible from the outside of the housing of the heating, ventilation and / or air conditioning apparatus, thus allowing easy replacement of the particulate matter detection sensor 14.

In the example illustrated here, the inlet 18 and said outlet 20 of the particulate matter detection sensor 14 are arranged adjacent to each other and the inlet 18 of the particulate matter detection sensor 14 is crossed by at least part of the secondary air flow F '.

A preferred embodiment provides that the inlet 18 and the outlet 20 are arranged on contiguous faces of the sensor so that the air entering the particulate detection sensor 14 performs a U-shaped path in the sensor. particulate matter detection 14.

An embodiment not shown proposes that the circulation channel 12 is a channel of a heating, ventilation and / or air conditioning device for a motor vehicle. In such a configuration, it is particularly advantageous to have the stabilization chamber provided with a particulate matter sensor at a point for sampling an air flow coming from the passenger compartment of a motor vehicle.

Claims (7)

Claims 1. Channel (12) for circulation of an air flow (F), in particular of a heating, ventilation and / or air conditioning device for a motor vehicle comprising a sensor for detecting (38) a parameter of the flow air (F) characterized in that said channel (12) for circulation of a 5 air flow (F) further comprises a stabilization means produced in the form of a chamber for stabilizing (16) the air flow disposed upstream of said detection sensor (38) of a parameter of the flow d 'air (F) in the direction of flow of said air flow (F). 2. Channel (12) for circulation of an air flow (F) according to the preceding claim wherein said stabilization chamber (16) is delimited by walls (34) and comprising a 10 inlet said precaptor inlet (21) in which a part of said air flow (F) circulates, said secondary air flow (F ’). 3. Channel (12) for circulation of an air flow (F) according to the preceding claim in which said detection sensor (38) of an air flow parameter (F) is provided at least partially in said stabilization chamber (16). 15 4. Channel (12) for circulation of an air flow (F) according to one of the preceding claims in which there is provided a means for driving said secondary air flow (F '), in particular a fan. . 5. Channel (12) for circulation of an air flow (F) according to the preceding claim wherein said detection sensor (38) of an air flow parameter (F) is a detection sensor of 20 particulate matter (14), in particular a particulate matter detection sensor (14) of particulate matter smaller than 2.5 µm in diameter. 6. Channel (12) for circulation of an air flow (F) according to the preceding claim wherein said particulate matter detection sensor (14) comprises at least one inlet (16), one outlet (18), one particulate matter measuring chamber (32), said inlet (16) of the 25 particulate matter detection sensor (14) and said outlet (18) of the particulate matter detection sensor (14) being disposed adjacent to each other and said inlet (18) being traversed by at least said secondary air flow (F '). 7. A heating, ventilation and / or air conditioning apparatus for a motor vehicle comprising at least one channel according to one of the preceding claims.