Patent Application
20190170158
The present invention concerns the field of motor-fan assemblies equipping motor vehicles in order to cool at least one component of same that experiences a temperature variation during operation. More specifically, the present invention relates to the field of blower wheels equipping such motor-fan assemblies and systems for driving the blower wheel, comprising an electric motor combining a stator and a rotor.
Motor vehicles comprise components that needs to be cooled due to the fact that they increase in temperature during operation. Such components include, for example, a battery providing the vehicle with electrical power, one or more power electronic components, or indeed the propulsion engine of the vehicle, which may be an electric motor or an internal combustion engine.
To this end, it is common to use a cooling system comprising a radiator inside which a heat transfer fluid circulates. The fluid collects calories released by the component and is conveyed in a closed circuit between the component and the radiator. The fluid is cooled inside the radiator as a result of heat exchange between the radiator and the ambient air. Depending on the component to be cooled, the radiator is commonly ventilated by a motor-fan assembly generating an air flow that increases the heat exchange between the radiator and the ambient air.
The motor-fan assembly conventionally comprises a base that is used to mount it on the vehicle. The base carries a drive motor for rotating at least one blower wheel. The blower wheel typically comprises a hub provided with means for rotationally linking with a drive shaft driven by the drive motor. The hub carries a plurality of blades distributed around the periphery of same, which extend radially. Control means control the implementation of the drive motor depending on the cooling requirements of the component.
Reference can be made, for example, to document FR 3 008 132 (VALEO SYSTEMES THERMIQUES), which describes such a motor-fan assembly used to cool a radiator.
Preferably, the performances obtained should be improved as far as possible in order to cool the component quickly and effectively. The present invention belongs to such a research context, taking into consideration economic constraints that require a trade-off to be found between achieving the performances expected in order to cool the component, organizing the cooling system in a simple manner and ensuring the structure of its components allow them to be obtained at lower costs.
In such a research context, the present invention concerns a motor-fan assembly dedicated to cooling a motor vehicle component, comprising an air propelling device, incorporating a hydraulic circuit through which a heat transfer fluid flows. The air propelling device comprises, in particular, a blower wheel and a system for driving the blower wheel. The present invention further concerns a system for cooling a component of the vehicle, comprising a motor-fan assembly according to the present invention.
The approach taken in present invention has led its designers to use the motor-fan assembly to cool a heat transfer fluid circulating therethrough, by using the air flow generated by the motor-fan assembly.
More particularly, the air propelling device of the motor-fan assembly is structured as a heat exchange member, capable of cooling the fluid conveyed from the component and circulating through the blower wheel.
Therefore, the motor-fan assembly equipped with the air propelling device of the present invention provides a dual function. A first function is that of generating an air flow and a second function is that of constituting a heat exchange member exchanging heat by means of the circulation of the fluid through the air propelling device. In other words, the motor-fan assembly is used not only to generate the forced air flow that passes through the radiator, but also to cool the fluid used to cool the component, as a result of its circulation at least in a hydraulic circuit incorporated into the air propelling device. The air flow and the fluid cooled by the air propelling device are used in conjunction to cool the component, moreover via a heat exchanger. Such a heat exchanger, used as the main radiator helping to cool the fluid, is positioned, in particular, on the circuit conveying the fluid between the component and the air propelling device. The main radiator can be mounted indiscriminately in series or parallel with the hydraulic circuit incorporated into the air propelling device.
Thus, the main radiator and the air propelling device form a set of heat exchange members together helping, for example, to cool the fluid circulating through the component. The heat exchanger can also additionally comprise an auxiliary radiator and/or a condenser cooled by the air flow.
The cooling of the component is thus more effective, due to the combined use of the air flow ventilating the heat exchanger, and the fluid cooled by the air propelling device, which now behaves like an additional heat exchanger.
The present invention therefore generally proposes to provide a hydraulic circuit channeling the fluid through the air propelling device of the motor-fan assembly. More particularly, the air propelling device is arranged to provide channels for the circulation of the fluid inside one or more of its components. The hydraulic circuit can, in particular, be incorporated into the blower wheel of the motor-fan assembly and/or into the blower wheel drive system. It should be noted that the components of the blower wheel comprise at least one hub and at least one blade, or indeed a plurality of blades, and preferably a crown, the latter linking an end of the blades opposite that which attaches the blades to the hub.
The hydraulic circuit is, in particular, arranged as a loop through which the fluid circulates between an inlet through which the fluid enters the blower wheel and/or the blower wheel drive system and a fluid outlet through which the fluid flows out of the blower wheel and/or the blower wheel drive system. A rotating hydraulic connector mounted coaxially on the hub of the blower wheel can provide the connection between the hydraulic circuit of the blower wheel and a circuit conveying the fluid between the component and the blower wheel. The inlet pipe and the discharge pipe can also be connected to a circuit conveying the fluid between the component and the stator. The fluid conveying circuit can advantageously comprise said heat exchanger mounted in series or parallel with the internal hydraulic circuit of the blower wheel and/or the stator, and can advantageously be ventilated by the air flow generated by the motor-fan assembly.
The components of the blower wheel used for the internal circulation of the fluid are advantageously arranged as hollow members, the internal recesses of which form channels through which the fluid circulates. Such hollow members can be obtained at lower costs by simplifying their individual structures by means of a double shell arrangement comprising two shells formed by molding and assembled together. Moreover, the shells respectively forming the component or components of the blower wheel can be produced in the form of one-piece blower wheel elements. These elements can be a part of the hub, a part of one or more blades, and/or a part of a crown encircling the blades.
The blower wheel elements can be formed at lower costs by molding and can be assembled together, for example axially. The blower wheel elements can be assembled together axially by sealing, in particular by bonding or welding. Such an assembly by sealing produces a sealed join between the shells. This prevents any fluid from leaking from the components of the blower wheel through which the channels are provided.
The components of the blower wheel can be made from a material that promotes heat exchange between the air flow and the heat transfer fluid present inside the blower wheel. The material can be metal or synthetic, for example. Such a synthetic material consists, in particular, of a resin filled with mineral fibers arranged into layers or fragmented. Such mineral fibers are, for example, glass fibers or carbon fibers.
Optimizing the path traveled by the fluid through the blower wheel is also proposed, in order to cool the fluid circulating inside same as much as possible. To this end, the fluid circulation channels extend between the hub of the blower wheel, the blades of the blower wheel mounted on the hub at the proximal end of same, and the crown linking the blades together at the distal end of same.
From such a proposition, various configurations extending the hydraulic circuit through the air propelling device can be envisaged in order to define the path traveled by the fluid through the motor-fan assembly, i.e. the hydraulic circuit of the air propelling device. Various configurations described below as illustrative examples correspond to respective trade-offs between:
Thus, the present invention can be in the form of a first embodiment in which the hydraulic circuit is incorporated into a blower wheel of the motor-fan assembly.
Such a blower wheel comprises a hub carrying a plurality of blades by the proximal ends of same. The blades preferably extend radially, being linked together at the distal end of same by a crown. It is understood that the axial and radial directions are relative concepts considered relative to the rotational axis of the blower wheel.
The hydraulic circuit preferably extends in a loop between the hub, the blades and the crown.
The hydraulic circuit thus forms a path where the heat transfer fluid travels, this path being able to extend through several blades, consecutively and/or concurrently, depending on the configuration of the hydraulic circuit.
The connection device advantageously comprises the following features taken alone or in combination:
According to another configuration of the hydraulic circuit, a channel of a first blade and a channel of a second blade are connected together by a peripheral channel of the crown that is allocated to them. The fluid thus circulates between a plurality of sets of channels each comprising two blade channels and one peripheral channel. In this context, the blades of a pair of adjacent blades are, for example, connected respectively with an inlet pipe and with an outlet pipe that are allocated individually to them.
According to another configuration of the hydraulic circuit, the blades of a first group of adjacent blades are in communication with a shared inlet pipe. The blades of a second group of adjacent blades are in communication with a shared outlet pipe. The channels of the first group of blades and the channels of the second group of blades are connected together by a single peripheral channel of the crown. According to this configuration, the fluid circulates through the channels of the first group of blades to the peripheral channel, which then conducts the fluid to the channels of the second group of blades. The set of channels of the first group of blades is advantageously supplied with fluid by a single inlet pipe and the set of channels of the second group of blades is advantageously connected to a single outlet pipe.
According to an advantageous embodiment, the blades are each arranged as double blade shells assembled together axially. These shells form blower wheel portions. One of the blade shells forms the pressure side of the blade and the other blade shell forms the suction side of the blade. Between them, the blade shells provide the channel for the circulation of heat transfer fluid allocated to the blade that the blade shells together delimit when they are assembled together.
According to another advantageous embodiment, the crown is arranged as double crown shells assembled together axially, between them providing at least one peripheral channel, and optionally a plurality of peripheral channels.
The double shell arrangement of the components of the blower wheel delimiting the hydraulic circuit allows the blower wheel to be formed by assembling the two blower wheel elements together axially. It should be noted that such components of the blower wheel comprise the hub, formed from the bottom and the lid, the blades each formed from two blade shells, and the crown formed from two crown shells. The blower wheel elements can be obtained separately by molding and can be assembled together by sealing. Thus, the blower wheel is advantageously constituted by two blower wheel elements assembled together axially. Each of said blower wheel element incorporates, securely attached to each other, one blade shell, one crown shell and one of the bodies constituting the hub.
The present invention also concerns a system for cooling a motor vehicle component, that comprises at least one circuit for conveying the heat transfer fluid between the component and at least one blower wheel according to the invention above. Such a cooling system can comprise at least one heat exchanger arranged in the circuit for conveying the heat transfer fluid between the component and the blower wheel, the heat exchanger being traversed by the air flow generated by the blower wheel.
According to the present invention, at least one heat exchange member comprises the blower wheel of a motor-fan assembly according to the present invention. In other words, the cooling system comprises at least one first heat exchange member constituted by the blower wheel of the motor-fan assembly.
In this context, the heat exchanger constitutes a second heat exchange member equipping the cooling system.
The heat exchanger is, in particular, in the form of at least one main radiator, and optionally an auxiliary radiator and/or a condenser. The main radiator is potentially a high-temperature or low-temperature radiator, through which the fluid originating from the component circulates before it is conveyed to the blower wheel of the motor-fan assembly. The heat exchanger, and in particular said at least one main radiator, is positioned, in order to exchange heat with the air, in the path of the air flow generated by the air propelling device of the motor-fan assembly, the air being set in motion by the blower wheel driven by the drive system.
It should be noted that the air flow can pass through the heat exchanger by suction or blowing of the air flow.
According to one embodiment, the fluid circulates from the component to the heat exchanger, and then to the blower wheel of the motor-fan assembly. The fluid is then sent back to the component, supplying cooled fluid in order collect calories released by the component.
The fluid conveying circuit comprises a first portion interposed between the component and the main radiator, then a second portion between the main radiator and the blower wheel of the motor-fan assembly. The main radiator and the blower wheel are potentially mounted on the fluid conveying circuit in series or in parallel.
According to one embodiment, the main radiator and the blower wheel are mounted in parallel on the fluid conveying circuit. The second portion of the fluid conveying circuit can then be connected to a fluid inlet box for the fluid to enter the main radiator and to a fluid outlet box for the fluid to exit the main radiator to the component.
According to an alternative or additional variant, the main radiator and the blower wheel are mounted in series on the fluid conveying circuit. The second portion of the fluid conveying circuit can then be connected to a fluid inlet box for the fluid to enter the main radiator.
According to one embodiment, the rotating hydraulic connector is preferably arranged axially opposite the blower wheel drive motor intended to be positioned on the base, facing the heat exchanger.
The present invention can also be in the form of a second embodiment in which the hydraulic circuit is incorporated into a system for driving a blower wheel of the motor-fan assembly. The motor-fan assembly is, in particular, dedicated to cooling a motor vehicle component, at least by generating an air flow circulating through at least one heat exchanger used for cooling it. The drive system comprises an electric motor comprising a rotor and a stator, for example, at least partially coaxial.
The stator can be equipped with a cooling unit ventilated by the air flow generated by the motor-fan assembly. Such a cooling unit is suitable for cooling the heat transfer fluid that experiences a temperature increase as a result of circulating through the vehicle component. In this context, the cooling unit can, for example, be formed from fins that extend radially between a peripheral ring of the stator and a shaft of the stator providing a passage for the rotor of the motor and/or for the hub of the blower wheel. It is understood that the axial and radial directions are relative concepts considered relative to the rotational axis of the rotor.
The fins of the cooling unit can advantageously be used to provide, through same, radial channels of the hydraulic circuit, connecting together external channels that may, for example, be annular, provided inside the ring, and internal channels that may, for example, be annular, provided inside the shaft.
The cooling of the fluid circulating through the stator is enhanced by extending the hydraulic circuit and therefore the path travelled by the heat transfer fluid through the stator. The components of the stator through which the channels making up the hydraulic circuit are provided are arranged as hollow members. The internal recesses of such hollow members delimit the channels constituting the hydraulic circuit. Such hollow members can be obtained at lower costs by simplifying their individual structures by means of a double shell arrangement comprising two shells formed by molding and assembled together axially. Moreover, the shells respectively forming the components of the stator can each be incorporated into one-piece stator elements.
Certain stator elements can be formed at lower costs by molding and can be assembled together axially. The stator elements can be assembled together axially by sealing, in particular by bonding or welding in a sealed manner. Such an assembly by sealing produces a sealed join between the different shells that constitute the stator component or components housing the channel or channels of the hydraulic circuit. This prevents any fluid from leaking from the components of the stator through which the channels are provided.
Since the stator is subjected to the air flow generated by the motor-fan assembly, the heat transfer fluid circulating inside the stator is cooled by this air flow.
The hydraulic circuit provided in the stator comprises, in particular, consecutively, an inlet pipe for the heat transfer fluid to enter the stator, at least one channel, that may, for example, be annular, provided inside at least one component of the stator and, advantageously, a discharge pipe for discharging the fluid out of the stator.
The stator can thus be connected to a circuit conveying the fluid between the component and the stator via the inlet pipe and the discharge pipe. The channel at least partially delimits a path where the heat transfer fluid circulates inside the stator between the inlet pipe and the discharge pipe.
According to one embodiment, at least one extension channel, for example an annular extension channel, referred to as an external channel, is provided inside a peripheral ring of the stator. It should naturally be understood that the ring constitutes one of the components of the stator. According to various configurations of the hydraulic circuit, the external channel can extend at least partially or virtually all the way along the ring. The ring can comprise a plurality of external channels, for extending the path travelled by the fluid through the stator. The peripheral ring of the stator can also surround the blower wheel, peripherally, the inner diameter of the ring then being strictly greater than the outer diameter of the blower wheel.
According to one embodiment, the external channels can extend indiscriminately concentrically or parallel to the inside of the ring, being connected together consecutively. In other words, the external channel can be arranged substantially as a spiral, each of the turns of the channel extending substantially along the ring. The fluid therefore travels along a path that extends several times around the ring.
According to another embodiment, the ring can comprise a plurality of external channels separate from each other. More particularly, such external channels can send the fluid consecutively from the ring to another component of the stator. Another such component of the stator can, in particular, be formed by a shaft delimiting a passage for the rotor and/or for the hub of the blower wheel intended to rotated by the drive system.
The stator is preferably equipped with a cooling unit extending radially between the ring and the shaft through which the rotor passes. It should naturally be understood that the shaft constitutes a second component of the stator, while the cooling unit represents a third component of the stator. According to one embodiment of the invention, the cooling unit is used as a heat exchanger, in particular extending in the radial plane of the stator.
Such a cooling unit is capable of dissipating the calories of the heat transfer fluid after this fluid has circulated through the stator. The cooling unit then restores the calories that it absorbs to the ambient air, being cooled by the air flow generated by the motor-fan assembly.
According to one embodiment, the cooling unit is arranged as a plurality of radial fins distributed angularly between the ring and the shaft, around the rotational axis of the rotor.
The cooling unit constituted in this way therefore comprises radial channels interposed between the external annular channel provided in the ring and the internal annular channel provided inside a cylindrical wall delimiting the shaft.
According to an advantageous embodiment using the cooling unit, the radial channels extend respectively into the fins constituting the cooling unit. The hydraulic circuit thus extends consecutively at least between one external channel and one internal channel by means of at least one radial channel.
In the context of such an arrangement of the cooling unit and according to various embodiments, the fluid can enter and/or be discharged via the ring and/or the shaft. Indeed, the inlet pipe and the discharge pipe can be connected indiscriminately:
According to one embodiment, the hydraulic circuit is provided between two stator elements formed by molding and assembled together axially. The stator elements then together form the component or components of the stator housing the channel or channels that constitute the hydraulic circuit.
The stator elements are, in particular, arranged as two respective shells, at least one of which is recessed. Between them, the shells provide said at least one channel. The stator elements constitute two axial sections that delimit at least the ring, and optionally also the shaft and optionally also the cooling unit, in particular the fins. Between them, the stator elements provide said at least one external channel, said at least one internal channel, and/or the radial channel or channels.
The present invention also concerns a motor-fan assembly comprising a blower wheel and a system for driving the blower wheel according to the present invention. The motor of the drive system is, in particular, mounted on a base that constitutes a member for mounting the motor-fan assembly on the vehicle.
The present invention further concerns a system for cooling a motor vehicle component. Such a cooling system comprises a circuit conveying the fluid between the component and at least the stator incorporating the hydraulic circuit.
More particularly, the fluid circulates in the environment of the component in order to collect calories that it releases. The fluid is then conveyed to at least one heat exchanger in order to be cooled. The cooled fluid is then sent back to the component.
In this context, the cooling system of the present invention is mainly distinguished in that it comprises a stator of a motor-fan assembly according to the present invention and used to cool the heat transfer fluid. In other words, the cooling system comprises a heat exchange member constituted by the stator of the electric motor that the motor-fan assembly comprises.
The cooling system preferably comprises a heat exchanger used as a radiator, in particular as the main radiator. The main radiator is interposed on the circuit for conveying fluid between the component and the stator constituting the electric motor equipping the motor-fan assembly.
The main radiator is also preferably positioned, in order for it to cool, in the path of the air flow generated by the motor-fan assembly. It should be noted that the air flow generated by this motor-fan assembly can function by suction or blowing of the air flow.
The cooling system can also comprise an auxiliary radiator and/or a condenser, in addition to the main radiator. This main radiator is potentially a low-temperature or high-temperature radiator, through which the heat transfer fluid originating from the component circulates before or after being conveyed to the stator according to the invention.
The fluid conveying circuit comprises, in particular, a first portion interposed between the component and the main radiator, then a second portion interposed between the main radiator and the stator. The second portion can then be connected to a fluid inlet pipe for the fluid to enter the main radiator and extend to the stator. The second portion can also then be connected to a fluid outlet pipe for the fluid to exit the main radiator and channeling the heat transfer fluid to the component to be cooled.
The main radiator and the stator are preferably mounted in series on the fluid conveying circuit. In this case, the second portion can comprise a downstream pipe that connects the stator directly to the component. The invention also covers the possibility of mounting the main radiator and the stator in parallel on the fluid conveying circuit.
Other features, details and advantages of the invention will become clearer on reading the description that follows as an example, with reference to the figures in the appended plates in which:
It should be noted that the figures show the present invention in a detailed manner and according to specific arrangements for the implementation of same, and that said figures can naturally be used, if necessary, to better define the present invention, both in terms of its specific features and in general.
Moreover, in order to clarify and facilitate the reading of the following description of the present invention, the same members shown in different figures are identified respectively, in the descriptions specific to these figures, with the same reference numbers and/or letters, without this necessarily implying that the embodiment is identical.
In diagrams (a) and (b) of
It should be noted that the examples listed above of applications of the present invention are mentioned for reference purposes, and should not be considered to be exhaustive. Indeed, the present invention can be applied to the cooling, by heat exchange by means of a heat transfer fluid, of at least one of any motor vehicle component that needs to be cooled.
In this context, the system 2 for cooling the component 1 implements a motor-fan assembly 3 setting in motion an air flow Fx that passes through a heat exchanger 8 intended to dissipate calories generated by the component 1. Such a heat exchanger can, for example, be in the form of at least one main radiator 8a preferably helping cool the component 1. The heat exchanger can also, for example, be formed by a gas cooler or a condenser of an air-conditioning loop.
The cooling system 2 comprises a circuit 4 for conveying the heat transfer fluid Fe between the component 1 and a hydraulic circuit included in a blower wheel 5 equipping the motor-fan assembly 3. It should be noted that the hydraulic circuit included in the blower wheel 5, described below with reference to
More particularly, the motor-fan assembly 3 essentially comprises a base 6 carrying a drive motor 7 for rotating the blower wheel 5. The base 6 constitutes a member for mounting the motor-fan assembly 3 on a structural element of the vehicle or on the heat exchanger. The drive motor 7 is, indiscriminately, a hydraulic motor or an electric motor engaged on a hub 9 of the blower wheel 5.
In the diagrams of
In the diagrams of
In diagram (a) of
In diagram (b) of
In this context, the component 1 is cooled by the heat exchanger 8 and/or by the blower wheel 5.
The second portion 16b, 17b of the circuit 4 for conveying the heat transfer fluid Fe is connected to the hydraulic circuit integrated into the blower wheel 5 by a rotating hydraulic connector 18 equipping the motor-fan assembly 3.
The hydraulic connector 18 constitutes a member for conveying the heat transfer fluid Fe from outside the blower wheel 5 to the hydraulic circuit that it incorporates. The hydraulic connector 18 is mounted coaxially on the hub 9 of the blower wheel 5. Such a rotating hydraulic connector 18 comprises at least two hydraulic elements 18a, 18b comprising heat transfer fluid Fe passages between them. A first hydraulic element 18a is mounted coaxially secured to the hub 9, so as to rotate with the blower wheel 5. The second hydraulic element 18b is mounted stationary around the first hydraulic element 18a.
In the diagrams of
Concerning the relative positions of the motor-fan assembly 3 and the component 1, the drive motor 7 is arranged axially facing the component 1 whereas the rotating hydraulic connector 18 is arranged axially on the motor-fan assembly 3 opposite the drive motor 7.
In diagram (b) of
In these figures, the hub 9 comprises recesses to allow the heat transfer fluid Fe to circulate between the blower wheel 5 and rotating hydraulic connector 18. The hub 9 comprises at least one inlet port 19a and at least one outlet port 19b. The inlet port or ports 19a delimit an inlet of the heat transfer fluid Fe from the rotating hydraulic connector 18 into at least one inlet pipe 20a formed by a first recess of the hub 9. The inlet pipe 20a connects the inlet port 19a with at least one first channel 21a extending inside a blade 10, in this instance the first blade traversed by the hydraulic circuit of the blower wheel 5. The outlet port or ports 19b delimit an outlet of the heat transfer fluid Fe to the rotating hydraulic connector 18 from at least one outlet pipe 20b formed by a second recess of the hub 9. The outlet pipe 21b connects the outlet port 19b with at least one last channel 21b extending inside a blade 10, in particular the last blade traversed by the hydraulic circuit of the blower wheel 5.
According to one embodiment, the inlet port 19a, the inlet pipe 20a, the outlet pipe 20b and the outlet port 19b are part of the hydraulic circuit incorporated into the blower wheel according to the invention.
In
The bottom 9a and the lid 9b each comprise a closing wall 23a, 23b between which the inlet pipe 20a and the outlet pipe 20b are provided. The closing walls 23a, 23b are designed to be positioned axially against each other once the bottom 9a and the lid 9b have been assembled together axially. The inlet pipe 20a and the outlet pipe 20b are provided in the thickness of the lid 9b, extending axially between the respective closing walls 23a, 23b of the bottom 9a and the lid 9b.
The bottom 9a comprises the housing 12 for receiving the drive motor 7. The housing 12 opens on the outside of the hub 9, on one of its axial faces opposite its other axial face covered by the lid 9b.
As previously indicated, link members 13 are provided on the inside of the housing 12 in order to prevent the hub 9 and the drive motor 7 from rotating relative to each other. In the embodiment shown, such link members 13 form notches that extend axially and are provided along a peripheral wall of the bottom 9a and facing radially towards the inside of the housing 12. The bottom 9a preferably also comprises a centering shaft 25.
It should be noted that the arrangements that have just been described in reference to
In
In
In this context, in
Thus, one or more peripheral channels 29 extend at least partially around the crown 11. The peripheral channel or channels 29 are, moreover, respectively connected to at least one channel opening on an outlet pipe 20b, referred to as the last channel 21b.
The reference S shows the direction in which the heat transfer fluid Fe circulates from its inlet into the interior of the blower wheel 5 through the inlet port 19a until it is discharged out of the blower wheel 5 through the outlet port 19b. Taking into consideration the direction S in which the heat transfer fluid Fe circulates through the blower wheel 5, hydraulic circuits 31a, 31b, 31c shown respectively in
More particularly, in diagrams (c) and (d) of
The second channel 21a opens on an intermediate channel 33a provided inside the hub 9. The intermediate channel 33a is formed by a recess provided in the thickness of the closing wall 23b of the lid 9b, as shown particularly clearly in diagram (f) of
Thus, the heat transfer fluid Fe travels along a plurality of channels 21a provided respectively in a series of adjacent blades 10, via one or more intermediate channels 33a, 33b and one or more peripheral channels 32a, 32b, forming the peripheral channel 29. At the end of the flow of the heat transfer fluid Fe inside the blower wheel 5, an end peripheral channel sends the heat transfer fluid Fe to the outlet pipe 20b via a last channel 21b provided in a last blade 10.
Moreover, in diagram (d) of
In diagrams (g), (h) and (i) of
The first channels 21a open on a single peripheral channel 29 extending around the whole of the crown 11. Moreover, the outlet pipe 20b is connected to a plurality of last channels 21b provided respectively inside adjacent blades 10 and opening on the peripheral channel 29, these last blades being three in number, in this example.
Thus, the second hydraulic circuit 31b comprises a first group of adjacent blades 10, inside which channels 21a are respectively provided, and a second group of adjacent blades 10 inside which last channels 21b are respectively provided. The heat transfer fluid Fe circulates from the inlet pipe 20a simultaneously through the plurality of first channels 21a, then into the peripheral channel 29 distributing the heat transfer fluid Fe simultaneously to a plurality of last channels 21b opening on the outlet pipe 21b.
In diagrams (i), (j) and (k) of
The heat transfer fluid Fe circulates from the inlet channels 20a to first channels 21a belonging to sets of channels allocated respectively to the inlet channels 20a. The heat transfer fluid Fe circulates from the first channels 21a to the portions of peripheral channel 29, then to the last channels 21b with which the first channels 21a respectively make up the sets of channels. The heat transfer fluid Fe is then conveyed to the outlet channels 20b connected respectively with the last channels 21b.
In diagram (h) of
According to the example of
According to the example of
In
Each of the blower wheel elements 5a, 5b comprises one of the bodies 9a, 9b constituting the hub 9, at least one blade portion 10a, 10b constituting the blades 10 and at least one crown portion 11a, 11b constituting the crown 11. The blade portions 10a, 10b can each consist of a set of elementary shells.
According to one embodiment, a first element 5a comprises the bottom 9a of the hub 9, a first crown portion 11a and at least one first blade portion 10a forming a pressure side of the blades 10. A second element 5b comprises the lid 9b of the hub 9, a second crown portion 11b and at least one second blade portion 10b forming a suction side of the blades. In this particular example, the first blade portion 10a and the second blade portion 10b each delimit a plurality of blades 10.
When the blower wheel elements 5a, 5b are assembled together, for example axially:
Regardless of the embodiment shown above, it should be noted that each blade 10 has a curved profile, in the radial direction of the blower wheel 5. The suction side and the pressure side of each blade 10 form blade walls that are inclined relative to the rotational axis A of the blower wheel 5.
Diagrams (m) to (o) of
According to the embodiment in diagrams (n) or (o), the heat exchanger 8 can be used as a radiator 8a, 8b, or indeed as a condenser 8c, or indeed as a combination of these means.
More particularly, the heat exchanger 8 is used at least as a main radiator 8a, in particular dedicated to cooling the component 1, through which the heat transfer fluid Fe conveyed to the blower wheel 5 circulates. The main radiator 8a can be a high-temperature or low-temperature radiator. The heat exchanger 8 can also be used as an auxiliary radiator 8b dedicated to cooling an auxiliary component 1.
The radiator or radiators 8a, 8b, and optionally the condenser 8c, are arranged consecutively one after another in the direction of movement of the air flow Fx, in particular parallel to their general plane. The air flow Fx generated by the motor-fan assembly 3 passes consecutively through the condenser 8c, if it is present, the auxiliary low-temperature radiator 8b, if it is present, then the main radiator 8a, referred to as the high-temperature radiator. The air flow Fx can be generated by blowing, as shown in diagrams (m) to (o). In this embodiment, the air flow Fx is pushed by the blower wheel 5 towards the heat exchanger or exchangers, the blower wheel 5 being arranged in front of the exchangers. According to another embodiment, the air flow Fx can be generated by suction. In this embodiment, the air flow Fx is sucked by the blower wheel 5 through the heat exchanger or exchangers, the blower wheel 5 being arranged after the heat exchangers, in particular between them and the component 1.
For example, in diagram (m), the heat exchanger 8 comprises only the main low-temperature radiator 8a, for example. However, it should be understood that, according to the embodiment shown in diagram (m), the main radiator 8a can also be a high-temperature radiator.
According to the example shown in diagram (n), the heat exchanger 8 comprises the main radiator 8a, the auxiliary radiator 8b, and indeed, additionally, the condenser 8c. This condenser 8c is then arranged facing the motor-fan assembly 3. The auxiliary radiator 8b is a low-temperature radiator, interposed between the high-temperature radiator 8a and the condenser 8c, if it is present. The air flow Fx is generated by blowing and passes consecutively through the condenser 8c, the auxiliary radiator 8b and then the main radiator 8a.
According to the variant in diagram (n), the conveying circuit comprises the high-temperature radiator 8a and the blower wheel 5.
According to the variant in diagram (o), the conveying circuit comprises the low-temperature radiator 8b and the blower wheel 5.
In all of the diagrams of
For reference purposes, results of obtained measurements are provided below, taking into account:
According to these hypotheses, it has been observed that, at the outlet of the high-temperature radiator 8a, the temperature of the heat transfer fluid Fe is of the order of 98° C. It has also been observed that, at the outlet of the low-temperature radiator 8b, the temperature of the heat transfer fluid Fe is of the order of 52° C.
If the condenser 8c is present, as shown in diagrams (n) and (o) of
In diagrams (a) and (b) of
It should be noted that the examples listed above of applications of the present invention are mentioned for reference purposes, and should not be considered to be exhaustive. Indeed, the present invention can be applied to the cooling, by heat exchange by means of a heat transfer fluid, of at least one of any motor vehicle component that needs to be cooled.
In this context, the system 2 for cooling the component 1 implements a motor-fan assembly 3 setting in motion an air flow Fx that passes through a heat exchanger 8 intended to dissipate calories generated by the component 1. Such a heat exchanger can, for example, be in the form of at least one main radiator 8a preferably helping cool the component 1. The heat exchanger can also, for example, be formed by a gas cooler or a condenser of an air-conditioning loop.
The cooling system 2 also implements a circuit 4 for conveying a heat transfer fluid Fe between the component 1 and a hydraulic circuit incorporated into the stator of the electric motor. The stator that is the subject matter of the invention provides heat exchange between its external environment and the heat transfer fluid Fe circulating through it.
According to the present invention, the stator 7a of an electric motor 7 equipping the motor-fan assembly 3 acts as a heat exchanger arranged to dissipate the calories present in a heat transfer fluid Fe in an air flow Fx. The stator 7a cooperates with a rotor 7b provided with a drive shaft for rotating the blower wheel 5. It should be noted that the hydraulic circuit incorporated into the stator 7a, described below with reference to diagrams (c) to (e) of
Referring more specifically to diagrams (a) and (b) of
The electric motor 7 is provided with means 7c for electrical connection to a power source of the vehicle. The electric motor 7 comprises the stator 7a and the rotor 7b mounted coaxially along the rotational axis A of the rotor 7b and the blower wheel 5. The rotor 7b carries the blower wheel 5 and the stator 7a is attached to the base 6, for example via fastening brackets 7d.
In the diagrams of
In diagram (a) of
In diagram (b) of
In this context, the component 1 is cooled by the heat exchanger 8 and/or by the stator 7a according to the invention.
In diagram (b) of
In
In diagrams (a) and (b) of
Diagrams (c), (d) and (e) of
In diagram (c) of
In diagram (d) of
In diagram (e) of
The radial channels 14 open, at their distal end, on the external annular channels 50a. The radial channels 14 also open, at their proximal end, on internal annular channels 51a provided inside a cylindrical wall 59 delimiting the shaft 51. The internal recess of the cylindrical wall 59 is segmented by radial partitions 49a distributed radially around the axis A in the recess of the cylindrical wall 59. In this way, a plurality of internal annular channels 51a is formed, forming chambers that bring two adjacent radial channels 14 into communication.
The heat transfer fluid Fe circulates from an external annular channel 50a, referred to as the first external annular channel, connected to the inlet pipe 18a, to a first radial channel 14. The heat transfer fluid Fe then circulates through an internal annular channel 51a, referred to as the first internal annular channel, then through a second radial channel 14 provided inside a fin adjacent to the first fin 52a comprising the first radial channel 14. The heat transfer fluid Fe then enters another external annular channel 50a that sends the heat transfer fluid Fe on again to another internal annular channel 51a via a radial channel 14. This arrangement for circulating the heat transfer fluid Fe through the stator 7a is repeated successively until the fluid enters a last radial channel 14 opening on a last external annular channel 50a connected to the discharge pipe 18b.
The hydraulic circuit 31c thus consists of a plurality of consecutive sets of channels 50a, 14, 51a. Each set of channels consists consecutively of an external annular channel 50a, a radial channel 14 of a fin 52a, and an internal annular channel 51a.
It should be noted that other variants not shown here can be implemented from sets of channels similar to the hydraulic circuit 31c shown in diagram (e) of
Diagrams (f) to (h) of
According to the embodiment in diagrams (g) or (h), the heat exchanger 8 can be used as a radiator 8a, 8b, or indeed as a condenser 8c, or indeed as a combination of these means.
More particularly, the heat exchanger 8 is used at least as a main radiator 8a, in particular dedicated to cooling the component 1, through which the heat transfer fluid Fe conveyed to the stator 7a circulates. The main radiator 8a can be a high-temperature or low-temperature radiator. The heat exchanger 8 can also be used as an auxiliary radiator 8b dedicated to cooling an auxiliary component 1.
The radiator or radiators 8a, 8b, and optionally the condenser 8c, are arranged consecutively one after another in the direction of movement of the air flow Fx, in particular parallel to their general plane. The air flow Fx generated by the motor-fan assembly 3 passes consecutively through the condenser 8c, if it is present, the auxiliary low-temperature radiator 8b, if it is present, then the main radiator 8a, referred to as the high-temperature radiator. The air flow Fx can be generated by blowing, as shown in diagrams (f) to (h). In this embodiment, the air flow Fx is pushed by the blower wheel 5 towards the heat exchanger or exchangers, the blower wheel 5 being arranged in front of the exchangers. According to another embodiment, the air flow Fx can be generated by suction. In this embodiment, the air flow Fx is sucked by the blower wheel 5 through the heat exchanger or exchangers, the blower wheel 5 being arranged after the heat exchangers, in particular between them and the component 1.
For example, in diagram (f), the heat exchanger 8 comprises only the main low-temperature radiator 8a, for example. However, it should be understood that, according to the embodiment shown in diagram (f), the main radiator 8a can also be a high-temperature radiator.
According to the example shown in diagram (g), the heat exchanger 8 comprises the main radiator 8a, the auxiliary radiator 8b, and indeed, additionally, the condenser 8c. This condenser 8c is then arranged facing the motor-fan assembly 3. The auxiliary radiator 8b is a low-temperature radiator, interposed between the high-temperature radiator 8a and the condenser 8c, if it is present. The air flow Fx is generated by blowing and passes consecutively through the condenser 8c, the auxiliary radiator 8b and then the main radiator 8a.
According to the variant in diagram (g), the conveying circuit comprises the high-temperature radiator 8a and the stator 7a.
According to the variant in diagram (h), the conveying circuit comprises the low-temperature radiator 8b and the stator 7a.
In all of the diagrams of
| Number | Date | Country | Kind |
|---|---|---|---|
| 1600338 | Mar 2016 | FR | national |
| 1600341 | Mar 2016 | FR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/FR2017/050417 | 2/24/2017 | WO | 00 |
