FR2762805A1 - HEATING-AIR CONDITIONING DEVICE FOR A MOTOR VEHICLE, WITH MOTOR-FAN GROUP WITH INTEGRATED EXTRACTIBLE AIR FILTER - Google Patents

Abstract

This device comprises a motor-fan unit (10) with a housing (34) housing a centrifugal turbine (12) driven by a motor and capable of axially sucking the surrounding air through the interior of the turbine and discharging it radially (22 ) outwardly, the housing comprising a peripheral volute (26) surrounding the turbine and capable of deflecting in the tangential direction (28) towards an outlet pipe (30) the air discharged radially. The housing of the motor-fan unit also houses, in the region of the volute and upstream of the outlet pipe, an air filter (40) through which the flow discharged by the turbine passes. It comprises a hatch (46) for access to the filter, the hatch whose position and dimensions are chosen so as to provide access to the filter from outside the housing to allow the removal of this filter from the housing, its possible exchange. and its reinsertion into the housing.

Description

Heating-air conditioning device for a motor vehicle

  le, with motorized fan unit with integrated extractable air filter

  The present invention relates to heating devices

  ventilation of motor vehicles, and more precisely the subassembly called "motor-fan group" or "blower"

incorporated into these devices.

  The motor-fan unit comprises a housing housing a centrifugal turbine driven by a motor to discharge a flow of pressurized air to an outlet pipe. This air flow then passes through a heating-refrigeration block mounted downstream of the motor-fan unit and comprising

  heat exchangers (radiator and possibly evaporated

  tor) to heat or cool the air which will then be delivered to the passenger compartment by various lines and

distribution outlets.

  The air stirred by the motor-fan unit must of course be filtered, and an air filter is generally provided for this purpose, interposed between the motor-fan group and

  the heating-cooling block.

  The presence of the filter is essential but, housed between these

  two blocks, it significantly increases the overall dimensions of

  ble of the heating-air conditioning system. In addition, it constitutes an additional element to be taken into account for the assembly of the device. Finally, it is necessary to provide a removable structure to be able to check the condition of the filter at regular intervals and replace a filter.

used by a new filter.

  One of the aims of the present invention is to provide a simplified structure of a heating-air conditioning device in which the air filter is not interposed between the

  motor-fan unit and the heating-air conditioning unit

  tion, but integrated in the motor-fan unit, inside thereof, while providing the user with easy access

  to easily check and exchange the filter.

  To this end, the device of the invention, which comprises a fan unit with a housing housing a turbine

  centrifugal driven by a motor and able to suction axially-

  ment the surrounding air from the inside of the turbine and discharge it radially outwards, the housing comprising a peripheral volute surrounding the turbine and capable of deflecting in tangential direction towards an outlet pipe the radially discharged air, is characterized in that the motor-fan unit housing also houses, in the region of the volute and upstream of the outlet pipe, an air filter through which the flow discharged by the turbine passes, and in that this housing includes a hatch access to the filter, hatch whose position and dimensions are chosen so as to provide access to the filter from outside the housing to allow removal of this filter from the housing, its

  possible exchange and its reinsertion in the housing.

  According to various advantageous subsidiary characteristics: - the housing includes a filter receptacle provided with means for guiding and holding the filter in the operating position in the volute; - the filter is provided with an extraction tab; - The hatch is closed by a cover from a one-piece molding with the housing, on which it is articulated by a hinge of the film-hinge type;

  - the cover of the hatch includes locking means;

  lage in the closed position by snapping on the housing body; and - the body of the housing essentially consists of two half-shells enclosing the turbine and defining axial air inlet openings, and capped by a cover defining the volute and the outlet pipe and carrying the filter receptacle and the cover of the filter access hatch. Other characteristics and advantages of the invention

  will appear on reading the detailed description below

  below an exemplary embodiment, made with reference to

attached figures.

  Figure i is an elevational view, in section along I-I of

  Figure 2, the motor fan assembly of the invention.

  FIG. 2 is an end view, along II-II of FIG. 1,

  of this same motor-fan group.

  Figure 3 is a sectional view along III-III of Figure 2, greatly enlarged, of the door closing latch

access to the filter.

  In Figures 1 and 2, the reference 10 designates the fan unit of a heating-air conditioning device for a motor vehicle, comprising (in itself known) a centrifugal turbine 12, which has for example a general shape of cylinder flattened provided at the periphery with a series of blades 14 joined together by an external circular ring 16. The turbine 12 is mounted on the shaft 18 of a drive motor 20. When the turbine is rotating, the air is driven by the blades 14 in the outward radial direction (arrows 22), which produces an axial suction of air (arrows 24) on the side of the turbine opposite to that where the motor 20 is located, and a

  discharge in the radial direction of the air thus sucked.

  The fan-motor unit also includes an element

  called "volute", referenced 26, which wraps circumferentially-

  Lement with an increasing section the turbine with a part in tangential extension, this volute 26 having for

  function of deviating in a substantially tangential direction

  tielle (arrow 28) the air flow discharged radially by the turbine and direct it towards an outlet pipe 30 where it will then be delivered to a heating-air conditioning unit,

  for example to pass through a heat exchanger 32.

  The body of the case 34 of the motor-fan unit can essentially consist of two half-shells enclosing the turbine and capped by a cover defining the volute and the outlet pipe, the whole being secured so

  permanent to the heating-cooling block located downstream.

  In the fan motor units of the prior art, an air filter is placed downstream of the outlet pipe 30, that is to say interposed between this outlet pipe 30 and

the heat exchanger 32.

  The object of the invention is to get rid of such a filter in an intermediate position, by incorporating the latter into the motor-fan unit itself, that is to say by placing it upstream of the outlet pipe 30, and this by allowing a

  easy access to this filter, without dismantling the power unit

  fan. More specifically, the housing 34 of the motor-fan unit comprises, in extension of the part 36 forming the peripheral envelope of the turbine 12, a tangential extension 38 at the distal end of which is mounted an air filter 40, in

  upstream of the outlet pipe 30 of the motor-fan unit.

  The filter 40 can be produced in the form of an independent block or module fitted inside the motor-fan unit in a suitable receptacle comprising, for example shoulders such as 42 and 44. The filter is inserted into its receptacle with a slight friction, so that it can be held in place in the operating position without risking being moved, but can be removed simply by exerting sufficient traction to dislodge it from this receptacle. To provide access to the filter without the need to

  separate the motor-fan group from the heating block-

  air conditioning, the housing 34 has a flap 46 at the location

  of the connection between the peripheral envelope part

  as 36 and the tangential extension 38. This flap is for example a pivoting flap opening, as illustrated in 48, away from the tangential extension 38 housing the filter 40. The hinge 50 articulating the cover 46 on the housing

  34 can advantageously be of the "film hinge" type, that is to say

  that is to say a hinge constituted simply by a thinned or grooved region of the housing, which makes it possible to produce a housing unit monobloc cover by simple molding of a

synthetic material.

  At its free end, the cover may include a flange such as 52 to facilitate its gripping by the user at the time of opening. In addition, this free end may include locking means 54, also produced in the form of a simple molded configuration of the part, as illustrated in the detail in FIG. 3: a T-shaped element is provided, the shaft of which is constituted by the flange 52 and the cross bar of which has at one end a hook 56 which fits on a shoulder 58 of the boot 38, the other end 60 forming a lever for

  allow easy release of the hook 56.

  The removal of the filter is carried out as follows.

  First of all, the filter 40, which is in the position illustrated in solid lines in FIG. 1, is dislodged from its receptacle and the shoulders 42, 44, advantageously by pulling on a tongue 62 secured to the filter element and accessible by the user who has introduced two fingers into the housing 34 through the orifice provided by the

cover in open position 48.

  The filter is then tilted (arrow 64) so as to place it substantially in the direction of the tangential extension 38 in order to be able to slide it along the latter. Once this tilting has been performed (filter in the position referenced 66), the user pulls it (arrow 68) in

  direction of the hatch and out of it.

  He can then remove the filter from the housing (position illustrated in 70) by grasping it completely (as illustrated in 72), which allows it to be removed (arrows 74 and 76) to allow its inspection and possible exchange by

a new filter.

  The filter is replaced in the same way,

  the steps being performed in reverse.

Claims (6)

Claims   1. A heating-air conditioning device for a motor vehicle, comprising a motor-fan unit (10) with a housing (34) housing a centrifugal turbine (12) driven by a motor (20) and capable of axially sucking (24) the surrounding air from the inside of the turbine and discharging it radially (22) towards the outside, the housing comprising a peripheral volute (26) surrounding the turbine and able to deflect in tangential direction (28) towards an outlet pipe (30 ) the radially discharged air, characterized in that the housing of the fan-motor unit also houses, in the region of the volute and upstream of the outlet pipe, an air filter (40) through which the flow discharged by the turbine, and in that this housing comprises a hatch (46) for access to the filter, hatch whose position and dimensions are chosen so as to provide access to the filter from outside the housing to allow removal of this filter outside the shoemaker, its and possible changes its reinsertion in the housing.   2. Device according to claim 1, in which the housing comprises a filter receptacle (42, 44) provided with means for guiding and holding the operating position of the filter in the volute.   3. Device according to claim 1, wherein the   filter is provided with an extraction tab (62).   4. Device according to claim 1, in which the hatch is closed by a cover coming from a one-piece molding with the housing, on which it is articulated by a hinge hinge-film type (50).   5. Device according to claim 4, in which the   hatch cover comprises means (54) for locking   lage in the closed position by snapping on the housing body.   6. Device according to claim 1, wherein the body of the housing consists essentially of two half   shells enclosing the turbine and defining axial air inlet openings, and capped by a cover defined-5 sant the volute (38) and the outlet pipe (30) and carrying the filter receptacle (42, 44) and the hatch cover (46) for access to the filter.