WO2019224455A1

WO2019224455A1 - Case for a motor vehicle heating, ventilation and/or air-conditioning apparatus

Info

Publication number: WO2019224455A1
Application number: PCT/FR2019/051108
Authority: WO
Inventors: Xavier DUTILLY; Thibault COISNE; Hervé RIGNAULT; Amanda Martinell; Guillaume Laucournet; Julien Brault
Original assignee: Valeo Systemes Thermiques
Priority date: 2018-05-22
Filing date: 2019-05-15
Publication date: 2019-11-28
Also published as: FR3081387A1

Abstract

The invention relates to a case for a motor vehicle heating, ventilation and/or air-conditioning apparatus, for treating an air flow (F), said case (2) including: - a recess (9) configured to receive a filter (8) for filtering the air flow (F), - a case element (11) at least partially defining the recess (9), - at least one guiding tube (12a; 12b) for guiding a secondary air flow (F') configured to be connected to a measurement sensor (10) for measuring a parameter of the air flow (F), the tube (12a; 12b) being arranged downstream of the recess (9) relative to a direction of flow of the air flow (F), characterised in that the tube (12a; 12b) is formed integral with the case element (11), in particular the tube (12a; 12b) and the case element (11) form a single moulded part.

Description

HOUSING FOR A HEATING APPARATUS, VENTILATION AND / OR

AIR CONDITIONING FOR MOTOR VEHICLE

The invention relates to a housing for a heater, ventilation and / or air conditioning for a motor vehicle.

A motor vehicle is commonly equipped with a heater, ventilation and / or air conditioning to regulate the aerothermal parameters of a flow of air distributed to the interior of the passenger compartment of the vehicle.

It is known to equip a motor vehicle with a sensor for measuring an air parameter. Such a sensor is generally disposed in the passenger compartment of the motor vehicle. It is also known to integrate the sensor in a heater, ventilation and / or air conditioning for a motor vehicle.

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

The invention aims to improve the integration of the various components of a heating, ventilation and / or air conditioning, and in particular improve the integration of the sensor.

The invention relates to a housing for a heater, ventilation and / or air conditioning for a motor vehicle, for the treatment of an air flow, said housing comprising: a housing configured to receive a filter for filtering the flow of air, air, a housing member at least partially defining the housing,

at least one guide tube for a secondary air flow configured to be connected to a sensor for measuring a parameter of the air flow, the tube being arranged downstream of the housing with respect to a direction of flow of the air flow, characterized in that the tube is made of material with the housing element, in particular the tube and the housing element form a same molded part. Thanks to the invention, it is possible to connect a sensor for measuring a parameter of the air flow to the housing, without the need for an additional step of machining the housing and without the need to use an extra room. The housing is thus, from its design, able to be associated with a sensor. This simplifies the assembly and assembly of the housing / sensor assembly.

The guide tube allows in particular the sampling towards a sensor of a part of the flow of air circulating in the housing. It is thus possible to make a measurement in a part of the housing where the space is restricted.

The housing may further include one or more of the following features, taken separately or in combination:

the housing further includes an access opening to the housing,

the access opening is arranged on a first side of the housing,

- The tube is arranged on a second side of the housing substantially opposite to the first side.

The sensor can thus be connected remotely from a user's manipulation zone of the filter. The risk of a disturbance of the sensor by the user is thus minimized. In particular, it is no longer necessary to disconnect the sensor when replacing the filter.

The housing may further comprise one or more of the following characteristics, taken separately or in combination: the tube extends substantially perpendicularly to the direction of the air flow in the housing, the tube extends at least partially opposite the housing , the housing is delimited by a wall, the wall of the housing delimits the inside of the outside of the housing, the casing wall defines an inner surface of the casing and an outer surface of the casing,

the tube protrudes from the wall of the housing,

- the tube is connected to the wall of the housing, - an inner portion of the tube extends inside the housing,

an outer portion of the tube extends outside the housing,

the inner portion of the tube is delimited by an inner tubular wall,

the outer portion of the tube is delimited by an outer tubular wall,

the thickness of the inner tubular wall is equal to the thickness of the outer tubular wall, the tube extends between its first end and its second end over a distance substantially equal to at least once its diameter, preferably on a distance substantially equal to at least twice its diameter, preferably over a distance substantially equal to at least three times its diameter, preferably over a distance substantially equal to at least four times its diameter.

Leakage of unfiltered air may occur around the perimeter of a filter installed in the housing. The tube projecting inwardly from the housing makes it possible to take a part of the flow of air flowing in the housing away from the periphery of the filter. The performance measurement of the filter is improved.

the tube extends in the thickness of the wall of the casing over a parietal portion of the tube,

the casing wall, the inner tubular wall and the outer tubular wall define an inner surface of the tube,

the inner surface of the tube delimits an internal space of the tube,

the inner surface of the tube comprises a projection so that a section of the internal space varies abruptly, the internal section of the tube between its second end and the projection is greater than the internal section of the tube between the projection and its first end,

- the projection is formed in the outer portion of the tube,

- the projection is substantially flush with the outer surface of the housing, - the projection is formed in the thickness of the wall of the housing,

the tube is cylindrical,

a section of the tube is circular,

a section of the tube is elliptical, the tube extends at a distance of between 1 millimeter and 20 millimeters from the housing, the housing comprises a location configured to receive a heat exchanger,

- The tube is arranged upstream of the location relative to the direction of flow of the air flow. Condensation of moisture from the air may occur at the evaporator in the location. Such condensation may affect the measurement of the sensor. An arrangement of the guide tube upstream of the evaporator location relative to the flow direction of the airflow reduces the risk of condensation returning to the sensor.

The housing may further comprise one or more of the following features, taken separately or in combination: the tube extends at a distance of between 1 millimeter and 20 millimeters from the location,

the housing and the location are adjacent, a distance between the housing and the location is less than 20 millimeters, preferably less than 15 millimeters,

- the tube is rigid, a section of the tube is oblong. The section of the tube which extends in a reduced space between the filter and the heat exchanger is thus optimized, to take the desired amount of air towards the sensor, while limiting the pressure drops.

The housing may further comprise one or more of the following features, taken separately or in combination: the access opening faces the housing, the access opening is substantially rectangular, the access opening is closed by a trap, the housing comprises a first guide tube of the secondary air flow and a second guide tube of the secondary air flow, the first and second guide tubes extend parallel to one another, the first and second guide tubes are adjacent to each other, the first and second tubes extend at a distance of between 1 millimeter and 20 millimeters from one another.

The first and second guide tubes allow the flow of secondary air removed to be discharged inside the housing. This minimizes the pressure difference between a secondary air flow sampling point and the discharge point of the secondary air flow, which ensures better sensor operation.

The invention also relates to a heating, ventilation and / or air conditioning apparatus comprising a housing as described above.

Other characteristics and advantages of the invention will emerge on reading the description of an embodiment which follows, with reference to the appended figures, which illustrate:

Figure 1 illustrates a sectional view of a heating, ventilation and / or air conditioning apparatus according to the embodiment described; FIG. 2 is a sectional view of the apparatus illustrating two guide tubes extending between an evaporator and a filter of the apparatus;

Figure 3 illustrates a sensor connected to the guide tubes;

Figure 4 illustrates a detail of the sensor fitted on the guide tube;

Figure 5 is an enlarged sectional view of the guide tubes;

Figure 6 illustrates a particular embodiment of the invention.

An apparatus for heating, ventilation and / or air conditioning for a motor vehicle 1 is a device capable of regulating the aerothermal parameters of an air flow F distributed towards the interior of a passenger compartment of a motor vehicle. This heater, ventilation and / or air conditioning for a motor vehicle 1 comprises a housing 2 delimited by walls and partitions in which openings are provided, including at least one air inlet 3a; 3b and at least one air outlet 4. The walls delimit in particular the inside of the outside of the casing 2. Said casing 2 is thus able to ensure the circulation of the air stream F which is treated in the apparatus of heating, ventilation and / or air conditioning.

The heating, ventilation and / or air-conditioning apparatus for a motor vehicle 1 comprises, for example, at least one air inlet 3a for an outside air flow AE said external air intake and / or an inlet for air 3b for a flow of air AR from the passenger compartment of the motor vehicle called recycled air intake. By outside air flow AE is meant a flow of air taken outside the passenger compartment of the motor vehicle, for example, at the level of a water box at the base of the windshield.

The heating, ventilation and / or air conditioning apparatus 1 typically comprises a blower 5 for the circulation of the air flow F from the outside air inlet (s) 3a or of the recycled air inlet 3b towards the air outlet (s). 4. For example, the heater, ventilation and / or air conditioning unit 1 may include an air outlet (not shown) disposed at the windshield of the motor vehicle, an air outlet (not shown). ) disposed at the aerators of the dashboard of the motor vehicle and / or an air outlet (not shown) disposed at the feet of the driver (or front passenger) in the passenger compartment of the motor vehicle.

The heating, ventilation and / or air conditioning unit 1 also comprises heat treatment means for heating and / or cooling the air flow F prior to its distribution inside the passenger compartment. As such, there is provided in the embodiment described an evaporator 6 in a location of the housing 2. The evaporator 6 is intended to cool and dehumidify the flow of air F therethrough. It can also be provided a heating radiator 7, possibly associated with an additional radiator of electric type, which is intended to heat the flow of air F through it.

The heating, ventilation and / or air conditioning unit 1 according to the described embodiment is provided with a filter 8 for the filtration of the treated air flow F so as to ensure the occupants of the motor vehicle a good quality of the air. The filter 8 is disposed in a housing 9 of the housing 2 of the heating, ventilation and / or air conditioning apparatus 1 between the blower 5 and the evaporator 6.

The heating, ventilation and / or air conditioning unit 1 may also include a sensor 10 for measuring a parameter of the treated airflow F, such as temperature or humidity. In the embodiment described, the sensor 10 is a particulate matter detection sensor.

The particulate matter detection sensor 10 is particularly a particulate matter detection sensor smaller than 10 μm in diameter and preferably less than 2.5 μm in diameter.

As a reminder, particulate matter is understood to mean any particle of sufficiently small size, generally of size less than 10 μm, to be transported by air and to be inhaled.

According to the invention, the housing 9 for the filter 8 is partially defined by a housing element 1 1 comprising, in this embodiment, a half-shell of the housing. A housing element 1 1 may consist of one or more portions of the housing 2, physically separable or not, with or without at least partial destruction of the housing 2. The housing 2 comprises a first guide tube 12a and a second guide tube 12b. The guide tubes 12a; 12b are configured to be connected to the particulate matter detection sensor 10. In the example described, the guide tubes 12a; 12b extend parallel to one another, and are in particular adjacent to each other. The guide tubes 12a; 12b are, as visible in Figure 2, cylindrical oblong section. In other words, the guide tubes 12a; 12b have the shape of an elliptical cylinder and a section of the cylinder corresponds to the surface resulting from the intersection of the cylinder with a plane perpendicular to the axis of revolution of said cylinder. A diameter of the tube corresponds to the largest segment of the cylinder section, passing through the axis of revolution of the cylinder. The section of the tube which extends in a reduced space between the filter and the heat exchanger is thus optimized, to take the desired amount of air towards the sensor, while limiting the pressure drops. The first guide tube 12a allows the collection towards the sensor 10 of a portion of the air flow F flowing in the housing 2. This portion taken from the air flow F is called secondary air flow F '. In the embodiment described, the sensor 10 is arranged outside the housing 2. It is thus possible to measure in a part of the housing 2 where the space is restricted.

The second guide tube 12b makes it possible to force the secondary air flow F 'inside the housing 2. This minimizes the pressure difference between a sampling point of the secondary air flow F 'and the discharge point of the secondary air flow F' which guarantees a better operation of the sensor 10.

The tubes 12a; 12b are arranged downstream of the filter 8 with respect to the flow direction of the air flow F. According to the invention, the tubes 12a; 12b are derived from material with the housing element 1 1. In the embodiment described, a tube 12a; 12b and the housing element 1 1 form the same molded part.

In the embodiment described, the sensor 10 comprises a first tube 13a configured to be connected to the first guide tube 12a and a second tube 13b configured to be connected to the second guide tube 12b. Tubes 13a; 13b are configured to be connected to the guide tubes 12a; 12b by complementarity of form. In the embodiment described, the tubes 13a; 13b are force-fitted on a tube 12a; 12b guide, without intermediate piece. The sensor 10 can thus be connected directly to the guide tubes 12a; 12b, without an additional piece, such as a hose is necessary. The pressure drop is thus minimized.

In the embodiment described, the tubes 12a; 12b and the tubes 13a; 13b are rigid and cooperate to fix the sensor 10 relative to the housing 2.

Preferably, the tubes 12a; 12b extend at a distance of between 1 millimeter and 20 millimeters from one another.

The housing 2 according to the invention facilitates the connection of the sensor 10 for detecting particulate matter, without an additional step of machining the housing 2 is necessary and without the need to use an additional room. The housing 2 is thus, from its design, adapted to be associated with the sensor 10. This simplifies the assembly and assembly of the housing assembly 2 / sensor 10.

In the embodiment described, the housing 2 further comprises an access opening to the filter 8 (not shown), arranged on a first side 15a of the housing 9 for the filter 8. The guide tubes 12a; 12b are arranged on a second side 15b of the housing 9 substantially opposite the first side 15a. Thus, the sensor 10 can be connected to a second side 15b of the housing 9, substantially opposite the first side 15a of the housing 9.

The sensor 10 is in this configuration arranged at a distance from a manipulation zone of the filter 8 by the user. The risk of a disturbance of the sensor 10 by the user is thus minimized. In particular, it is no longer necessary to disconnect the sensor 10 when the filter 8 is replaced.

In the embodiment described, the access opening (not shown) advantageously faces the housing 9 for the filter 8 and is substantially rectangular to pass a filter 8 of standard size. The access opening is preferably closed by a hatch (not shown).

In the embodiment described, the tubes 12a; 12b extend substantially perpendicular to the direction of the air flow F in the housing 9 for the filter 8, facing the filter 8. The tubes 12a; 12b are connected to a wall 16 of the housing 2 from which they project.

The wall 16 of the housing 2 considered in this embodiment defines an inner surface 17a and an outer surface 17b of the housing 2 (see Figure 5). The thickness of the wall 16 of the housing 2 thus corresponds to the shortest distance between the inner surface 17a and the outer surface 17b.

Preferably, a tube 12a; 12b extends at a distance of between 1 millimeter and 20 millimeters from the filter 8.

As shown in FIG. 5, a tube 12a; 12b extends inside the housing 2 on a portion of the tube 12a; 12b said INT inner portion of the tube 12a; 12b (see Figure 5). The inner portion INT of the tube 12a; 12b is delimited by a tubular wall called inner tubular wall 18a. A tube 12a; 12b further extends outside the housing 2, on a portion said EXT outer portion of the tube 12a; 12b. The outer portion EXT of the tube 12a; 12b is delimited by a tubular wall called outer tubular wall 18b. In this embodiment, the thickness of the inner tubular wall 18a is equal to the thickness of the outer tubular wall 18b.

Thus, a first end 14a of a tube 12a; 12b is arranged inside the housing 2, while an opposite second end 14b of the tube 12a; 12b is arranged outside the housing 2 (see Figure 5). Preferably, a tube 12a; 12b extends between its first end 14a and its second end 14b for a distance substantially equal to at least one diameter. Leaks of unfiltered air may occur around the periphery of a filter 8 installed in the housing 9. A tube 12a; 12b extending inside the housing 2 projecting from the wall 16 of the housing 2 makes it possible to take a part of the air flow F circulating in the housing 2 away from the periphery of the filter 8, as is represented in FIG. 3. The accuracy of the measurement is improved.

As shown in FIG. 5, a tube 12a; 12b extends in the thickness of the wall 16 of the housing 2 on a portion said parietal portion 19 of the tube 12a; 12b. Thus, the wall 16 of housing 2, the inner tubular wall 18a and the outer tubular wall 18b delimit an inner surface 20 of the tube 12a; 12b (see Figure 5). The inner surface 20 of the tube 12a; 12b delimits itself an internal space 21 of the tube 12a; 12b.

In the embodiment described, the inner surface 20 of a tube 12a; 12b comprises a projection 22 so that a section of the internal space 21 varies abruptly. A section of the internal space 21 corresponds to the surface resulting from the intersection of the internal space with a plane perpendicular to the axis of revolution of the tube 12a; 12b.

In particular, in this embodiment, the section of the internal space 21 between the second end 14b of the tube 12a; 12b, arranged outside the housing 2, and the projection 22 is greater than the section of the internal space between the projection 22 and the first end 14a of the tube 12a; 12b, arranged inside the housing 2. The projection 22 serves in particular as a stop surface for a pipe 13a; 13b of the sensor 10 which can thus be force-fitted until the tubing 13a; 13b is in abutment against the projection 22. The tubing is inserted into the inner space 21 of the tube 12a; 12b, the projection 22 thus cooperates with one end of the tubing 13a; 13b, and the stop surface is able to limit the insertion depth of the tubing 13a; 13b in the inner space of the tube 12a; 12b.

As illustrated in Figure 5, a projection 22 of the first tube 12a is formed in the outer portion EXT of said tube 12a and is substantially flush with the outer surface 17b of the housing 2, while a projection 22 of the second tube 12b is formed in the thickness of the wall 16 of the housing 2. Of course, it can be provided the opposite configuration where a projection 22 of the second tube 12b is substantially flush with the outer surface 17b of the housing 2 and the projection 22 of the first tube 12a is formed in the thickness of the wall 16 of the housing 2.

In the embodiment described, the tubes 12a; 12b are arranged upstream of the evaporator 6 relative to the direction of flow of the air flow F, that is to say between the filter 8 and the evaporator 6. A distance between the filter 8 and the evaporator 6 is preferably less than 20 millimeters. In this way, the filter 8 and the evaporator 6 are adjacent. Preferably, the tubes 12a; 12b extend at a distance of between 1 millimeter and 20 millimeters from the evaporator 6. Preferably, the tubes 12a; 12b extend at a distance of between 1 and 20 millimeters from one another.

Condensation of the humidity of the air may occur at the evaporator 6. Such condensation may affect the measurement of the sensor 10. An arrangement of the tubes 12a; 12b upstream of the evaporator 6 with respect to the flow direction of the air flow F makes it possible to reduce the risk of condensation returning to the sensor 10.

In a particular embodiment shown in FIG. 6, a first duct 23a guides towards the sensor 10 a flow of air taken at the inlet of the heating, ventilation and / or air-conditioning apparatus 1, called the incoming airflow FE . In this embodiment, the sensor 10 is configured to measure a particulate matter of the incoming airflow in addition to a particulate matter contained in the airstream F downstream of the filter 8. It is thus possible to compare the measurement a particulate material upstream of the filter 8 with the measurement of a particulate material downstream of the filter 8, in order to measure the performance of the filter 8. The incoming airflow FE is discharged at the inlet of the apparatus 1 by means of a second conduit 13b. The second conduit 13b thus minimizes the pressure difference between a sampling point of the incoming airflow FE and a discharge point of said incoming airflow FE.

Claims

claims

1. Housing for a heater, ventilation and / or air conditioning for a motor vehicle, for the treatment of an air flow (F), said housing (2) comprising: - a housing (9) configured to receive a filter (8) for filtering the airflow (F),

a housing element (1 1) at least partially defining the housing (9),

at least one guide tube (12a; 12b) of a secondary air flow (F ') configured to be connected to a measurement sensor (10) of a parameter of the air flow (F), the tube (12a; 12b) being arranged downstream of the housing (9) with respect to a flow direction of the air flow (F), characterized in that the tube (12a; 12b) is made of material with the element housing (1 1), in particular the tube (12a; 12b) and the housing element (1 1) form a same molded part.

2. Housing according to claim 1, characterized in that it further comprises an access opening to the housing (9), the access opening being arranged on a first side of the housing (9), and the tube ( 12a, 12b) being arranged on a second side of the housing (9) substantially opposite to the first side.

3. Housing according to one of claims 1 or 2, characterized in that an inner portion (INT) of the tube (12a; 12b) extends inside the housing (2).

4. Housing according to one of the preceding claims, characterized in that an outer portion (EXT) of the tube (12a; 12b) extends outside the housing (2).

5. Housing according to one of the preceding claims, characterized in that the tube (12a; 12b) extends between its first end (14a) and its second end (14b) for a distance substantially equal to at least once its diameter.

6. Housing according to one of the preceding claims, characterized in that the inner surface (20) of the tube defines an internal space (21) of the tube (12a; 12b), the inner surface (20) of the tube comprising a projection ( 22) such that a section of the internal space (21) varies abruptly.

7. Housing according to one of the preceding claims, characterized in that the housing (2) comprises a location configured to receive a heat exchanger, the tube (12a; 12b) being arranged upstream of the location relative to the direction. of the flow of air (F).

8. Housing according to one of the preceding claims, characterized in that a section of the tube (12a; 12b) is oblong.

9. Housing according to one of the preceding claims, characterized in that it comprises a first guide tube (12a) of the secondary air flow (F ') and a second guide tube (12b) of said air flow. secondary (F ').

10. Heating, ventilation and / or air conditioning apparatus comprising a housing (2) according to one of the preceding claims.