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
  • F04D29/04—Shafts or bearings, or assemblies thereof
  • F04D29/043—Shafts
  • F04D29/044—Arrangements for joining or assembling shafts
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D13/00—Pumping installations or systems
  • F04D13/02—Units comprising pumps and their driving means
  • F04D13/021—Units comprising pumps and their driving means containing a coupling
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D13/00—Pumping installations or systems
  • F04D13/02—Units comprising pumps and their driving means
  • F04D13/021—Units comprising pumps and their driving means containing a coupling
  • F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
  • F04D13/026—Details of the bearings
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D13/00—Pumping installations or systems
  • F04D13/02—Units comprising pumps and their driving means
  • F04D13/021—Units comprising pumps and their driving means containing a coupling
  • F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
  • F04D13/027—Details of the magnetic circuit
• • 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
  • F04D29/04—Shafts or bearings, or assemblies thereof
  • F04D29/046—Bearings
  • F04D29/049—Roller bearings

Definitions

• the invention relates to a water pump according to the preamble of claim 1.
• Water pumps are used especially in the automotive industry to circulate the water of the cooling system of vehicles. They are set in motion by a belt that drives a pulley. Initially, the pulley was directly fitted on the transmission shaft and the ball bearing was inside the pump body. The pulley can also be mounted outside the pump on a ball bearing placed on a bearing of the pump housing. The belt is connected to the motor so that as it rotates, the belt drives the pump in rotation, whether or not it is necessary to circulate the coolant. This results in a significant loss of energy and increased wear of the pump parts.
• the document WO 2005/028 901 A1 proposes to insert between the pulley and the shaft a friction clutch controlled by an adjusting ring.
• This ring is provided with inclined planes which cooperate with a corresponding toothing made on the housing of the pump.
• the adjusting ring moves more or less the plate of the clutch integral with the pulley.
• the pulley is moved at the same time as the clutch disc which it is secured.
• this clutch disk is replaced by clutch segments formed on a moving disk, the clutch segments passing through openings formed for this purpose in the pulley so that the pulley is not moved in translation.
• This second embodiment is therefore particularly complicated.
• these pumps are subject to rapid wear due to the friction of the two clutch discs one over the other.
• Friction coupling is composed on the one hand of an electromagnet placed on the pump housing and surrounded by a magnetic flux guide ring integral with the pulley and on the other hand a magnetic anchor placed through a leaf spring on a drive disk integral with the drive shaft.
• the leaf spring holds the magnetic anchor away from the magnetic flux guide and the pump is driven by the viscous coupler. If necessary, the electromagnet is energized and attracts the magnetic anchor that presses against the magnetic flux guide. The pump is then driven synchronously with the pulley.
• the friction coupling is similar to that previously described in DE 100 13 252 A1, the electromagnet having the function here not of spreading the pressure plate, but of attracting it against the driving element. .
• the drive of the shaft is not done by remote magnetic coupling, but by friction of two elements pressed against each other either by the force of a spring or by that of a electro magnet.
• EP 1 353 051 A2 a pump similar to that of WO 2004/007 923 A1 is known in which the viscocoupler is replaced by a magnetic coupling.
• a permanent magnet secured to the pulley drives following the formation of eddy currents, a magnetizable element placed on a movable support axially integral in rotation with the drive shaft. If the flow rate is insufficient, an electromagnet is energized. This attracts, against the effect of a spring, the movable support which is pressed against the rotor of the pulley.
• the object of the present invention is to develop a water pump according to the preamble that allows to circulate water only when the temperature justifies so as to save energy. Coupling regulation must not require energy input.
• the regulation of the pump should preferably be simple and robust.
• the drive means can be in operation without driving the pump. Mating will only occur when predefined parameters are reached.
• the magnetic coupling between the first and the second magnetic element is not subject to wear.
• the displacement means being autonomous, they do not require power supply.
• the displacement means comprise control means by raising the temperature, in particular as a function of the temperature of the water prevailing in the circuit connected to the pump, in particular as a function of the temperature of the water at the paddle wheel.
• these temperature-elevated control means comprise an element that can expand under the effect of heat, in particular a wax or spring steel element or a bimetallic element, and so as to be able to move one of the magnetic elements, when it expands, in the direction of the other magnetic element.
• This type of moving means is particularly simple and robust and is not subject to wear. As said before, they are autonomous and do not require external power supply, only the heat from the water pump is sufficient.
• the transmission shaft is preferably provided with a control flange fixed in rotation with it and which carries the first magnetic element. The control flange can be moved towards the second magnetic element by the moving means.
• the transmission shaft is preferably secured to the outer race of a first bearing.
• the coupling device may comprise a rotating casing integral in rotation with the drive means and on which the second magnetic element is fixed, the rotating casing preferably being integral in rotation with the outer casing of a second bearing.
• the rotating housing can be moved axially towards the first magnetic element by the moving means.
• the water pump according to the invention has the following characteristics:
• the transmission shaft is extended on the opposite side to the impeller by a radial casing secured to the outer casing of a first bearing, the inner casing of which is fixed to the pump casing, a control flange integral in rotation with the transmission shaft is mounted on it, preferably at the radial housing, while being able to move in translation parallel to the axis of rotation of the transmission shaft under the effect of the displacement means,
• the control flange is provided with the first magnetic element; the drive means are provided with a rotating case bearing the second magnetic element, the said rotating case being integral with the outer cage of a second bearing whose inner cage is preferably integral with the outer race of the first bearing.
• the drive means may comprise a contact surface, preferably secured to the cage of the second bearing, in particular the outer cage.
• the magnetic elements each consist of a plurality of permanent magnets arranged in a ring at a regular distance from each other, the two rings being spaced axially from one another.
• the permanent magnets are constituted by magnetized pellets, the magnetized pellets forming the first magnetic element being arranged with the same orientation and those forming the second magnetic element being arranged in the same orientation, identical or opposite to that of the first magnetic element.
• the permanent magnets are constituted by corner magnets, the magnets forming the first magnetic element being all arranged in the same orientation and those forming the second magnetic element being all arranged in the same orientation, identical or opposite.
• the inclination of the beveled face of the magnets forming the first magnetic element being preferably different from the inclination of the beveled face of the magnets forming the second magnetic element.
• Figure 1 a partial section through a pump according to the invention
• Figure 2 schematically the faces of the control flange and the rotating housing facing each other according to a first embodiment
• Figure 3 schematically (a) front view and (b) view from above, the face of the control flange which faces the rotating housing according to a second embodiment, and (c) a corresponding corner magnet.
• the pump (1) is composed of a housing (2) in which there is a bladed wheel (3) mounted on a transmission shaft (4). Driving means are provided for driving the shaft (4) in rotation.
• the housing (2) is provided with a bearing (5) on which is fitted the inner cage (6 ') of a first ball bearing (6).
• the transmission shaft (4) is integral with the outer casing (6 ") of the same first bearing (6), for which the transmission shaft is extended by a radial casing (7) which terminates in a crown
• the crown (8) is fitted on the outer casing (6 ") of the first bearing (6). It goes without saying that it would also be possible to directly fasten the radial housing (7) with the outer cage (6 ") of the first bearing (6) without using the crown (8).
• a second bearing (9) is fitted on the crown (8).
• the inner race (9 ') of this second bearing (9) is therefore integral with the transmission shaft (4), while the outer race (9 ") serves as a pulley for a drive belt (not shown). also possible to place a pulley on the outside cage (9 ") of this second bearing
• a dynamic seal (10) is placed between the housing (2) and the transmission shaft (4) to seal the pump (1) at the drive.
• the outer casing (9 ") of the second bearing (9) is closed laterally by a rotating casing (1 1), a first magnetic element (12) is placed on the radial casing (7), and a second magnetic element ( 13) is placed on the rotating housing (1 1).
• the pump can not operate because the magnetic elements (12, 13) are too far apart.
• the friction experienced by the impeller in the pump is too great for the rotation of the outer cage (9 ") of the second bearing (9) can significantly cause the inner cage (9 ') and therefore the shaft
• the magnetic elements (12, 13) are too far apart to provide sufficient magnetic coupling to overcome the friction experienced by the impeller.
• the coupling device is thus provided with autonomous displacement means for bringing the magnetic elements closer to or away from one another according to predefined parameters.
• These displacement means are placed between the transmission shaft (4) and the outer cage (9 ") of the second bearing (9) to couple or uncouple these two elements according to predefined parameters.
• This displacement device is controlled according to the temperature of the water in the pump, in particular the temperature at the impeller.
• Displacement means (16, 17, 18) are therefore provided for moving the control flange (14) towards the second magnetic element (13).
• These control means consist of an expandable element (16), a return spring (17) and a stop (18) on which the return spring can bear.
• the expandable element (16) terminates in a rod (16 ') which is integral with the control flange (14) and which passes through the stop (18).
• the expandable element is contracted and the spring tends to pull the rod (16 ') towards the inside of the pump (to the left in the figure) by driving with it the flange control (14).
• the magnetic elements are then too far apart to cooperate and the impeller is not driven, even if the drive means (9 ") are running.
• the expandable element (16) expands causing the compression of the return spring (17) and the outward movement of the pump (to the right in the figure) of the rod ( 16 ').
• This carries with it the control flange (14) which is close to the rotating housing (1 1).
• the magnetic elements (12, 13) are sufficiently close to each other, they cooperate together and the rotation of the rotating housing (1 1), integral with the drive means (9 "), causes the rotation of the flange control (14) and therefore the radial housing (7) integral with the transmission shaft (4), the water pump is then running and the cooling water is circulated.
• expandable element (16) retracts causing the magnetic elements (12, 13) to move away from each other, slowing down then stopping the impeller (3).
• Expansion of the expandable member (16) can be abrupt so that the pump has only two positions. This is essentially an all-or-nothing operation. It is also possible for this expansion to progressively occur so that the pump can take an infinite number of positions between the two extreme positions.
• the expandable element (16) serves not only as a temperature raising control means, but also as a plug for separating the inside of the pump from the coupling device (7, 12, 13, 14) and the device. drive (9 ").
• This expandable member (16) may be a wax member that expands as the temperature increases and thereby causes axial movement of the shank (16 '). It can also be an element that deforms under the effect of heat, such as a spring steel element or a bimetallic strip.
• the magnetic elements (12, 13) can be of different natures. At least one of them consists of one or more permanent magnets. The other may also consist of one or more magnetizable elements.
• These magnetic elements (12, 13) can also take different forms. These magnetic elements may consist of two annular elements or on the contrary of a plurality of elements distributed at regular intervals. It is preferable that the magnets or the magnetizable elements are arranged on two circles concentric with the axis of rotation of the transmission shaft (4) and facing each other. In this case, and contrary to the known provisions of, for example, DE 100 12 252 A1 for example, the two magnet rings are not arranged one inside the other, but opposite each other, axial distance from each other.
• the magnets can be formed for example by twice eight pellets distributed regularly on the one hand on the control flange (14) and on the other hand on the rotating housing (1 1).
• Figure 2 shows the faces of the control flange (14) and the rotating housing (1 1) which, in the mounted state, face each other. All the pads of the control flange
• the magnets are no longer constituted by pellets, but by cubes bevelled on one side as shown in FIG.
• the inclination (i) of the bevel is not the same for the magnets of the control flange (14) as for those of the rotating housing (1 1).
• the magnets of both crowns will all be oriented in the same way so that they will face each other with the same pole.
• the spinning field will become larger than the attraction field, and it will then be possible to obtain a rotational speed of the transmission shaft greater than the speed of rotation of the pulley.
• Figure 3b only the magnets located at 3h, 6h, 9h and 12h in Figure 3a are shown in Figure 3b.
• the displacement means (16, 17, 18) cause the translation of the first magnetic element (12) towards the second magnetic element (13), which itself is locked in translation.
• moving the second magnetic element (13) towards the first magnetic element (12) which would then be locked in translation.
• the spring (17) would then have the function of pushing the control flange (14) outwards, and it would also be possible to combine the two solutions.
• the displacement of the first magnetic element (12) in the direction of the second (13), or vice versa can be done by a translation parallel to the axis of rotation of the transmission shaft (4), as in the example presented here.
• a radial displacement caused by appropriate displacement means the magnetic elements then preferably being oriented, not radially, but parallel to the axis of the transmission shaft (4).
• the first bearing for rotating the transmission shaft may be inside the housing.
• the second bearing need not necessarily be located around the first one.
• the drive belt can cooperate either directly with the outer cage (9 ") or with a pulley secured to the outer race (9") of the second bearing.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Family Cites Families (7)

• 2007
  • 2007-02-08 FR FR0700916A patent/FR2912474B1/fr not_active Expired - Fee Related
• 2008
  • 2008-01-30 WO PCT/EP2008/051109 patent/WO2008107239A1/fr active Application Filing
  • 2008-01-30 EP EP08708424A patent/EP2115303A1/de not_active Withdrawn

Non-Patent Citations (1)

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