Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/40—Casings; Connections of working fluid
  • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
  • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
  • F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
  • B60H1/00—Heating, cooling or ventilating [HVAC] devices
  • B60H1/00457—Ventilation unit, e.g. combined with a radiator
  • B60H1/00471—The ventilator being of the radial type, i.e. with radial expulsion of the air
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D25/00—Pumping installations or systems
  • F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
  • F04D25/166—Combinations of two or more pumps ; Producing two or more separate gas flows using fans
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/40—Casings; Connections of working fluid
  • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
  • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
  • F04D29/4226—Fan casings
  • F04D29/4246—Fan casings comprising more than one outlet

Definitions

• the invention relates to a fan and a heating, ventilation and / or air conditioning device equipped with such a fan.
• This fan comprises a single turbine having blades distributed around the periphery of a cylinder and having a longitudinal axis around which it is driven in rotation by a motor, and comprising an air suction region located on the side of a face end of the turbine.
• a separating partition defines a closed contour separation channel which flares from upstream to downstream so as on the one hand to separate the air from the suction region into a central flow circulating inside the separation channel and a peripheral flow circulating at the periphery of the separation channel, and to direct these flows inside the fan to the blades of the turbine.
• the object of the invention is to improve such a fan thanks to dimensional considerations which ensures an optimization of the performances and a reduction of the losses of load.
• the invention therefore proposes a fan comprising at least one turbine having blades of useful height of air outlet Hu, this fan comprising an air suction region located on the side of an end face of the turbine and having a separation channel defined at least partly by a separator partition fixed so as on the one hand to separate the air from the suction region into a central flow flowing inside the separation channel and section of input Sint and an annular peripheral flow circulating at the periphery of the separation channel and Sext input section, and secondly to directing these flows inside the fan towards the blades of the turbine, characterized in that the Sint / Sext ratio is between 0.5 and 2.
• This essential dimensional characteristic ensures a reduction of the pressure losses which can be further optimized by the combination of one or more of the following characteristics.
• the ratio Sint / Sext is equal to 1.
• a partition defines said closed contour separation channel which flares from upstream to downstream.
• the distance Hc between the downstream end of said blades of the turbine and the downstream end of said separating partition is between 70% of Hu / 2 and 120% of Hu / 2.
• the distance Hc is substantially equal to Hu / 2.
• the fan also comprises a radial partition disposed downstream of said turbine, integral with said housing and separating the central flow and the peripheral flow
• said radial partition has an angle of between 45 ° and 90 ° with respect to said longitudinal axis, in the trigonometrical direction.
• said radial partition is perpendicular to said longitudinal axis.
• said blades of the turbine and the inner end of said radial partition is between 70% of Hc and 110% of Hc, Hc being the distance between the downstream end of said blades of the turbine and the downstream end of said partition wall.
• a line tangent to the flared end downstream of the partition wall is disposed at or below the end upstream of said radial partition, in the orientation adopted in the figures.
• the upstream end of said partition separates outwardly from the wall of said housing or is disposed inside said housing, the distance between the upstream end of said partition and the wall of said partition. casing traversed by this partition wall being less than 10% of the inside diameter of the upstream end of said partition wall.
• the radial clearance between said blades and the downstream end of said separating partition is between 1 and 7 mm.
• the radial clearance between said blades and the inner end of said radial partition is between 1 and 7 mm.
• said clearance is substantially equal to 4 mm.
• the invention also relates to a heating, ventilation and / or air conditioning device comprising such a fan.
• Figure 1 is a perspective view of a fan according to the invention.
• Figure 2 is a longitudinal sectional view of a fan according to a first embodiment of the invention, according to the plane I-I.
• Figure 3 is a longitudinal sectional view of a fan according to a second embodiment of the invention, according to I-I.
• the invention relates to a fan comprising a single turbine 4 having blades of useful height of air outlet Hu distributed over the periphery of a cylinder, having a longitudinal axis around which it is driven. in rotation by a motor not visible in the figure and surrounded by a housing 20.
• This fan comprises an air suction region located on the side of an end face of the turbine and having a separating partition 10 defining a closed contour separation channel which flares from upstream to downstream on the one hand to separate the air from the suction region into a central flow A flowing in the interior 31 of the separation channel and input section Sint and an annular peripheral flow B circulating at the periphery of the separation channel and Sext inlet section, and to direct these flows inside the fan to the blades of the turbine 4.
• the flow of air that reaches the inside of the fan 4 is divided in two, namely a central flow A and a peripheral flow B by a separating partition 10 of revolution about the longitudinal axis of rotation of the fan 4, said separating partition 10 being fixed to the housing 20, for example, by means of radial fins not shown
• the separating partition 10 thus delimits a central channel 31 and an annular peripheral channel 32, in communication with respective outlets.
• the separating partition 10 has an upstream region 10B presenting in cross-section a circular section, and a flared downstream region 10A whose end is preferably directed in a radial direction of the cylindrical crown.
• the end 10A is located in a median portion of the blades 5, which also distributes the flow A and B on two outlets, also directing them on an upper part and on a lower part of the blades 5.
• the presence of the separating partition 10 makes it possible, by separating the flows and redirecting them towards the blades, to obtain a more laminar flow on the lower part blades and improved operation of the upper part, allowing better performance of the blades 5 over their entire height.
• Such a fan is described in the patent document FR 2 788 086 and is intended to equip a heating, ventilation and / or air conditioning device and in particular such a device installed in a motor vehicle, one of the flows being through example intended to be directed towards the windshield and the other stream being for example intended to be directed in the lower part to the feet of the occupants of the vehicle.
• FIG. 2 represents a first embodiment of the invention.
• the fan also comprises an annular radial partition 30 disposed downstream of the turbine, integral with the housing 20 and separating the central flow A and the peripheral flow B.
• annular radial partition 30 located at the periphery of the wheel 4 can be implemented to completely separate the flows A and B in output, so as to create two parallel air circuits, which is particularly suitable for cases where these flows come from different sources, for example outside air and air recirculated.
• the distribution of flows preferably equal to the upper part and the blade part, improves the distribution of air, and homogenize the amounts of air diffused at the top and bottom of the fan, and particular to create a balancing airflow.
• the ratio Sint / Sext is between 0.5 and 2, and preferably equal to 1.
• the distance Hc between the downstream end of the blades 5 of the turbine and the downstream end of said separating partition 10 is between 70% of Hu / 2 and 120% of Hu / 2 and preferably this distance Hc is substantially equal to Hu / 2.
• the annular radial partition 30 is perpendicular to the longitudinal axis.
• the distance Hcl between the downstream end of the blades 5 of the turbine and the inner end of said annular radial partition 30 is between 70% of Hc and 110% of Hc, Hc being the distance between the downstream end of said blades 5 of the fan and the downstream end of said separating partition 10.
• a straight line T tangent to the end flared A 10A downstream of the separating partition 10 is disposed at or below the upstream end of said annular radial partition 30, in the orientation adopted in the figures.
• the upstream end 10B of the separating partition 10 projects outwardly from the wall of the housing 20.
• the radial clearance J l between the blades 5 and the downstream end of the separating partition 10 is between 1 and 7 mm, and preferably substantially equal to 4 mm.
• the radial clearance J2 between said blades and the inner end of said radial partition is between 1 and 7 mm and preferably substantially equal to 4 mm.
• FIG. 3 represents a second embodiment which differs in the arrangement of the annular radial partition 30.
• This annular radial partition 30 is here inclined and has an angle ⁇ between 45 ° and 90 ° relative to the longitudinal axis, in the trigonometrical direction.
• the upstream end of the separating partition 10 can be disposed inside the housing 20, the distance between the upstream end of the separating partition 10 and the wall of the housing 20 traversed by this separating partition being less than 10. % of the inside diameter of the upstream end 10B of the separating partition 10.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)
• Air-Conditioning Room Units, And Self-Contained Units In General (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=54396856

Family Applications (1)

Country Status (3)

Cited By (1)

Families Citing this family (16)

Citations (1)

Family Cites Families (4)

• 2015
  • 2015-10-29 JP JP2017523235A patent/JP6479977B2/ja active Active
  • 2015-10-29 EP EP15790074.7A patent/EP3212942A1/fr not_active Withdrawn
  • 2015-10-29 WO PCT/EP2015/075097 patent/WO2016066739A1/fr active Application Filing

Patent Citations (1)

Non-Patent Citations (1)

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