FR2661645A1 - HEATING OR AIR CONDITIONING SYSTEM PROVIDED WITH A FILTER FOR A MOTOR VEHICLE. - Google Patents

Abstract

Heating or air conditioning installation for a motor vehicle, comprising an air blower (1) having a housing (6) in which is housed a turbine driven by an engine, and comprising at least one filter (7) for the air from frustoconical shape, arranged upstream of the turbine and removably attached to the blower housing.

Description

Heating or air conditioning system fitted with a filter for

  motor vehicle The invention relates to a heating or air conditioning installation for a motor vehicle, comprising an air blower having a housing in which is housed a

turbine driven by a motor.

  For reasons of hygiene and comfort, such facilities

  lations are more and more frequently equipped with fil-

  very, which can be passive filters intended to

  mechanically remove particles such as airborne dust, and / or active filters, intended to retain or destroy by physical or chemical action

  harmful substances in the air.

  These filters can be placed upstream or downstream of the pulp

  In particular, when the blower is housed in a

  special compartment located at the top and rear of the compar-

  motor, separated from it by a wall having a convexity facing the engine compartment, it is known to have a filter, or two filters when the blower has two inlet openings, in the same

  special compartment, at a certain distance from the kicker.

  The object of the invention is to simplify the mounting of the device.

  tallation, while allowing easy access to the filter

  for its replacement when it is saturated or exhausted.

  The invention relates to a heating or air conditioning installation for a motor vehicle, comprising an air blower having a housing in which is housed a turbine driven by a motor, and comprising at least

  an air filter placed upstream of the turbine, characteristic

  in that the filter is removably attached to

the blower housing.

  In general, the space available in a motor vehicle is strictly limited The space available for the passage of air opposite the inlet opening of the

  blower, especially in the special compartment

  tioned above, usually has a cross section

  roughly equal to the area of this inlet opening.

  It is therefore possible to accommodate a flat filter having little

  near this surface, but the resulting pressure drop may

  than being excessive One can increase the useful surface of the filter by producing a cylindrical filtering wall having

  as a basis for the entry opening But such a cylindrical wall

  drique would be very close to the limit of the aforementioned air passage space, which would make air access difficult

  to the outside inlet face of the filter.

  Therefore, according to a preferred feature of the invention,

  vention, the filter comprises a filter wall substantially of revolution, for example conical or frustoconical, whose diameter increases in the direction of air flow. Thus, as the air flows towards the blower, it gradually passes through the filter, the passage section outside the filter, for the decreasing amount of air which has not yet passed through it, decreasing, while inside the filter, the section of passage for the increasing amount of air that has already passed through it

  increasing This provision ensures a loss of char-

  minimum age, especially when the filter wall

  conical or frustoconical at an angle at the apex between

and 1200.

  Frequently used in the installations considered a centrifugal blower inside which the air flow in the circumferential direction increases in size up to the outlet, the passage section in this same direction also increasing in order to receive the flow d 'air

  ascending In some cases this cross section crosses

  health is obtained by enlarging the housing in the

  direction of the axis of rotation of the turbine In these con-

  editions, the outline of the air inlet opening of the housing

  is not contained in a plane perpendicular to this axis.

  It is therefore advantageous if the filter wall is connected

  dée at the entry opening by an intermediate sleeve, to allow this wall to be of revolution around

of the axis of rotation.

  The invention also relates to an air blower for an installation

  heating or air conditioning as defined above, this air blower having a housing in which is housed a turbine driven by a motor, as well as at least one filter removably attached to said housing,

upstream of the turbine.

  Other characteristics and advantages of the invention res-

  will emerge from the detailed description below, and des-

attached sins in which:

  FIG. 1 is a perspective view of a first example

  ple embodiment of an installation according to the invention i Figure 2 is a partial schematic view from above of a second embodiment of an installation according to the invention; Figure 3 is a partial schematic side view of the same installation; and FIGS. 4 and 5 are views in axial section of a frustoconical filter and of an intermediate sleeve making

part of this installation.

  The ventilation and heating system illustrated in

  Figure 1 includes an air blower 1 and a block 2 of treatment

  forced air placed downstream of the blower in the circuit

  air cooked The block 2 contains in particular a non-visible heat exchanger in which circulates a hot liquid coming from the cooling circuit of the heat engine of the vehicle, circuit to which it is connected by pipes 3 The block 2 also contains movable flaps for the air circuit control, and includes nozzles 4 for the air outlet in the passenger compartment of the vehicle The blower 1 and the block 2 are mounted respectively on the faces

  front and rear of a wall 5 limiting forwards the habiti-

tackling the vehicle.

  The blower 1 comprises a housing 6 housing a turbine and a drive motor not visible in the figure, and defining a circumferential path for the air having already entered the housing The axis of rotation of the turbine

  is oriented perpendicular to the plane of symmetry

  dinal of the vehicle The housing 1 has two air inlet openings, opposite to each other in the axial direction, these openings being covered, according to the invention,

  by air filters 7 each having a filter wall

  te 8 of substantially frustoconical shape whose large base 9 coincides with the inlet opening and whose small base

is occupied by a solid bottom 10.

  It can be seen that the width of the housing 6 in the axial direction varies in the circumferential direction, so that the inlet openings are not located in radial planes The frustoconical wall 8 can be contained in

  a conical surface of revolution around the axis of rotation

  tion of the turbine, its large base then being oblique to the axis Alternatively, the wall 8 may have

  a large base perpendicular to its axis, and for example be

  magpie of revolution, this axis then being oblique to

to the axis of rotation.

  Figures 2 and 3 show the air blower of an installation

  tion similar to that of FIG. 1, mounted in a similar manner This blower 20 is housed in a compartment 21 situated at the rear and at the top of the engine compartment 22 of the vehicle and separated from the latter by a sheet metal wall 23

  extending in front of and below the kicker.

  The compartment 21 is separated from the passenger compartment 40 of the vehicle by a wall 41 similar to the wall 5 of FIG. 1, and limited upwards by the hood 42 of the vehicle The housing

  24 of the blower 20, like the housing 6 of FIG. 1, presented

  te a variable axial width, and inlet openings

  opposing air that is not in per-

  pendular to the axis of rotation 25 of the turbine 43 and of the drive motor 44 Next to these inlet openings are arranged respectively two air filters 26, one of which is shown in detail in FIG.

  filter 26 comprises a filter wall 27 of frustoconical shape

  that of revolution around the axis 25, whose large base is open while its small base is closed by a bottom 28 The wall 27 extends axially between the bottom 28 and an annular flange 29 rigidly connected to the latter

  by oblique arms 30 distributed in the circumferential direction

  which also serve as support for the

filtering wall.

  To connect the flange 29 of each of the filters, which

  lies substantially in a radial plane, at the edge of the

  corresponding entry groove which is not in a radial plane, an intermediate sleeve 31 is provided, shown particularly in FIG. 5 This sleeve comprises a tubular wall 32 of circular section centered on the axis 25, one end of which 33 is located in a radial plane to come into sealing abutment against the flange 29, by

  via a seal 45, and the end of which

  opposite mite 34, not planar, conforms to the edge of the inlet opening of the housing 24 The assembly of the filter 26 to the sleeve 31 is done by a screw, not shown, the head of which rests on the outer face of the bottom 28 of the filter and the rod of which extends axially through a central opening in the bottom and cooperates with a nut (not shown) embedded in a hub 36 belonging to the sleeve 31 and rigidly connected to the tubular wall 32 by three arms 37 arranged at angles of 1200 around the axis This method of assembly

  allows easy replacement of the filter.

  from sleeve 31 to case 24, it can be permanent and

made for example by welding.

  Modifications can be made to the embodiments.

  sation described and shown as non-binding examples

  mitatives Thus a frusto-conical filter of revolution can be mounted directly on an inlet opening situated in a radial plane, the axis of revolution of the filter being coincident with the axis of rotation of the turbine. The filter can have a filtering bottom wall adding to

  the frustoconical filtering wall This filtering bottom wall

  te can occupy the small base of the truncated cone, thus increasing the surface of the filter, or its large base, thus providing a second filter in series with the first, which can have another function The filtering wall can also be conical and not frustoconical , or present another

  shape, for example hemispherical, or cylindrical when

  that the air passage is sufficient Good

  heard, when the blower has only one opening

  input filter, only one filter and if necessary only one

  intermediate sleeve are provided.

Claims (8)

Claims   1 Heating or air conditioning system for vehicles   automotive module, comprising an air blower (1, 20)   dant a housing (6, 24) in which is housed a turbine driven by a motor, and comprising at least one filter   (7, 26) for the air disposed upstream of the turbine, characteristic   ridiculous in that the filter is removably attached to the blower housing.   2 Installation according to claim 1, characterized in   that the filter has a sensitive filter wall (27)   of revolution whose diameter is increasing   in the direction of air flow.   3 Installation according to claim 2, characterized in that the filtering wall of revolution is substantially conical or frustoconical.   4 Installation according to one of claims 2 and 3, ca-   characterized in that the filter comprises a filtering wall (27) of revolution around the axis of rotation (25) of the   turbine, this wall being connected by an intermediate sleeve   diary (31) to an air inlet opening of the housing whose outline is not contained in a perpendicular plane to this axis.   Installation according to one of claims 3 and 4, ca-   characterized in that the conical or frustoconical filtering wall   that has an apex angle between 150 and 120.   6 Installation according to one of claims 2 to 5, charac-   characterized in that the filter is fixed by a screw extending along the axis of the filtering wall, the head of which rests on the top of the latter or on a bottom wall (28) which is integral therewith, and which cooperates with a threaded hole   of the case or the intermediate sleeve.   7 Installation according to one of the preceding claims,   characterized in that the filter is suitable for retaining mechanical   only airborne particles.   8 Installation according to one of the preceding claims,   characterized in that the filter is capable of retaining or destroying by physical or chemical action of the substances harmful contained in the air.   9 Installation according to one of the preceding claims,   characterized in that the blower has two opposite air inlet openings each provided with a fixed filter on the housing.   Air blower (1, 20) for a heating installation   or air conditioning according to one of the preceding claims.   teeth, having a housing (6, 24) in which is housed a turbine driven by a motor, as well as at least one filter (7, 26) removably attached to said housing, upstream of the turbine.