pump group

Abstract

The invention is a pump group fluidically connectable to a cooling system of an operating group of a vehicle. The pump group comprises a shaft and an impeller integrally mounted on the shaft. The pump group has at least one electrically driven drive comprising an electric motor comprising a rotor integrally mounted on the shaft and a stator. Furthermore, the pump group comprises a pump body comprising a first casing housing the impeller in an impeller chamber and a second casing in which the electric motor is housed in a motor chamber, wherein the second casing comprises an intermediate tubular wall positioned between the rotor and the stator so that a rotor chamber and a stator chamber are defined in the motor chamber and are mutually sealed apart. The first casing and the second casing are separated by a first separation wall comprising an impeller surface facing the impeller chamber and a motor surface facing the motor chamber. The pump group comprises a thermally conductive resin at least partially covering the motor surface to cool the stator chamber by thermal conduction.

Description

TECHNICAL FIELD

[0001] The present invention relates to a pump group for a cooling system of a vehicle. BACKGROUND

[0002] In the course of the description, the term "vehicle" refers to any mobile means comprising an internal combustion engine and hybrid vehicles, without any limitation related to the type or size, i.e. motor cars or articulated vehicles.

[0003] In other words, the present invention relates to the automotive sector and, in detail, to the thermal management system of a vehicle.

[0004] In particular, the cooling system is dedicated to cooling the "operating group" of the vehicle.

[0005] In particular, in the present description, the "operating group" refers to the components or groups of components dedicated to performing specific operations necessary for the movement of the vehicle. In a preferred embodiment, the "operating group" comprises an engine group, for example of the heat absorbing type or of the electric type.

[0006] In other embodiments, the "operating group" comprises other components of the vehicle, i.e. both mechanical type components (for example transmission assemblies) and electrical type components (for example "battery assemblies" comprised in the vehicle).

[0007] In the prior art, it is known that the pump groups for the cooling system of the operating group differ from each other in a plurality of embodiments in terms of size and type of actuator.

[0008] In particular, the pump group of the present invention is one in which there is an electric type driver. In other words, the pump group of the present invention comprises at least one electric motor which controls the rotational movement of the impeller comprised therein, thus controlling the movement of the cooling liquid flowing in the cooling system which can be fluidically connected to the pump group.

[0009] A plurality of technical solutions are known of pump groups comprising an electric driver, in which pump groups of this type there is the unavoidable main problem of the need to effectively cool the electric motor and the components related thereto of the pump group.

[0010] In particular, a plurality of embodiments of the pump group are known in which the cooling liquid present in the chamber which houses the impeller is also used to cool the electric motor and the components related thereto. Even more in particular, in the prior art, it is known that there is interest in using the cooling liquid to cool the rotor comprised therein.

[0011] Furthermore, a plurality of embodiments of the pump group are known in which the problems associated with the cooling of the stator are also solved.

[0012] In some embodiments, the pump group has been designed to favor the cooling of the stator, making it thermally divergent towards the external environment.

[0013] However, in other embodiments, a certain amount of oil is provided in the stator chamber for the purpose of cooling the stator chamber containing the oil by convection. An example illustrating this pump assembly solution is shown, for example, in the applicant's document WO2020 / 07562.

[0014] On the other hand, these implementations effectively cool the rotor and / or stator, but fail to effectively cool other parts of the pump assembly. Summary of the Invention

[0015] Therefore, the object of the present invention is to provide a pump assembly for a cooling system of a vehicle operating unit that effectively cools the entire electronic control component, thereby eliminating the problems described above.

[0016] This objective is achieved through a pump assembly.

[0017] The pump assembly, used in the cooling system of an operating assembly of a vehicle such as an engine unit, extends relative to an axis and includes:

[0018] i) The impeller can rotate around its axis;

[0019] ii) A shaft that extends along an axis and is operatively connected to the impeller;

[0020] iii) An electric motor, comprising: a rotor integrally mounted on a shaft; and a stator axially and circumferentially surrounding the rotor;

[0021] iv) Pump body, comprising along the axis:

[0022] - First housing, in which the impeller is housed in an impeller chamber, and the cooling fluid circulates in the impeller chamber;

[0023] - A second housing, in which the electric motor is housed in a motor chamber, wherein the second housing includes an intermediate tubular wall extending parallel to the axis and positioned between the rotor and the stator, thereby defining a rotor chamber and a stator chamber within the motor chamber.

[0024] The first housing and the second housing are separated by a first separation wall, which includes an impeller surface facing the impeller along the axial direction and a motor surface facing the motor along the axial direction.

[0025] The pump assembly includes a thermally conductive resin that at least partially covers the motor surface to cool the stator chamber via heat conduction through the motor surface. Attached Figure Description

[0026] The object of the invention will be described in detail below with the aid of the accompanying drawings, in which:

[0027] -Figure 1 A longitudinal cross-sectional view of a pump assembly according to the invention according to a first possible embodiment is shown, wherein a thermally conductive resin film is shown on the surface of the motor;

[0028] - Figure 2 A longitudinal cross-sectional view of a pump assembly according to the invention according to a second possible embodiment is shown, wherein a thermally conductive resin film on the motor surface and a resin film / resin layer on the stator tubular surface are shown.

[0029] - Figure 3 A longitudinal cross-sectional view of a pump assembly according to the invention according to a third possible embodiment is shown, wherein a thermally conductive resin film on the motor surface, a resin film / resin layer on the stator tubular surface, and a resin film on the second separation wall are shown.

[0030] - Figure 4 A longitudinal cross-sectional view of a pump assembly according to the invention, according to a fourth possible embodiment, is shown, wherein a certain amount of thermally conductive resin fills the stator chamber and the command chamber;

[0031] - Figure 5 A longitudinal cross-sectional view of a pump assembly according to the invention according to a fifth possible embodiment is shown, wherein a thermally conductive resin layer on the motor surface is shown;

[0032] - Figure 6 A longitudinal cross-sectional view of a pump assembly according to the invention, according to a sixth possible embodiment, is shown, wherein a certain amount of thermally conductive resin and conventional oil fill the stator chamber and command chamber;

[0033] - Figure 7 It shows Figure 1 An enlarged view of a portion of the pump assembly shown. Detailed Implementation

[0034] In the list above, reference numeral 1 generally indicates a pump set for a cooling system of a vehicle operating unit, preferably a pump set for cooling an engine unit (e.g., an internal combustion engine).

[0035] The pump unit 1 of the present invention extends mainly in length relative to the axis XX.

[0036] The pump assembly 1 of the present invention includes an impeller 2 that is rotatable relative to the axis XX. In other words, the impeller 2 has a center of rotation located on the axis XX.

[0037] Preferably, the impeller 2 is a radial impeller specifically shaped to preferably perform a suction action on the coolant in the axial direction and preferably a pushing action in the radial direction. Specifically, the "coolant" is a water-based fluid, such as a solution comprising water and ethylene glycol, which circulates in the vehicle's cooling system, to which the pump assembly 1 of the present invention is fluidly connected.

[0038] Furthermore, according to the present invention, the pump assembly 1 includes a shaft 3 extending along the axis XX in length. Preferably, the shaft 3 includes a rotating end 32 on which the impeller 2 is integrally mounted.

[0039] According to the present invention, the pump assembly 1 includes an electric motor 4 adapted to drive the shaft 3 to rotate.

[0040] The electric motor 4 includes a rotor 41 and a stator 42. According to a preferred embodiment, the rotor 41 and the stator 42 are arranged concentrically with respect to the axis XX.

[0041] According to the invention, the rotor 41 is integrally mounted (e.g., connected by a key) on the shaft 3: rotation of the shaft 3, and consequently rotation of the impeller 2, corresponds to the electrically controlled rotation of the rotor 41. The stator 42 axially and circumferentially surrounds the rotor 41. Specifically, the stator 42 includes a plurality of stator coils forming the stator.

[0042] According to the present invention, the pump assembly 1 includes a pump body 6 extending parallel to and primarily about an axis XX. The pump body 6 is adapted to include various operating components of the pump assembly 1 and is adapted to be fluidly connected to a vehicle cooling system.

[0043] According to the present invention, the pump body 6 includes, along axis XX:

[0044] - A first housing 61 that houses the impeller 2 in an impeller chamber 610;

[0045] - Second housing 62, in which motor 4 is housed in motor chamber 620; specifically, motor chamber 620 houses rotor 41 and stator 42.

[0046] According to the present invention, the second housing 62 includes an intermediate tubular wall 625 that extends parallel to the axis XX and is positioned between the rotor 41 and the stator 42.

[0047] The intermediate tubular wall 625 divides the rotor chamber 621 and the stator chamber 622 within the second housing 62. In other words, the motor chamber 620 is divided into the rotor chamber 621 and the stator chamber 622. Preferably, the rotor chamber 621 and the stator chamber 622 are sealed apart from each other.

[0048] According to a preferred embodiment, the first housing 61 and specifically the impeller chamber 610 included therein can be fluidly connected to a cooling system in which coolant flows.

[0049] According to the present invention, the first housing 61 and the second housing 62 are separated by a first separation wall 624. The first separation wall 624 axially defines and tightly seals the motor chamber 620.

[0050] Specifically, according to the present invention, the first separation wall 624 includes an impeller surface 628 facing the impeller 2 axially, and a motor surface 629 facing the motor 4 axially. In other words, the impeller surface 628 axially defines the impeller chamber 610, while the motor surface 629 axially defines the motor chamber 620.

[0051] Preferably, the first separation wall 624 is included in the first housing 61.

[0052] In an alternative embodiment, the first separation wall 624 is included in the second housing 62.

[0053] In another embodiment, a portion of the first separation wall 624 is included in the first housing 61 and another portion is included in the second housing 62.

[0054] Preferably, the first separation wall 624 is transversely traversed by and supports the shaft 3.

[0055] According to a preferred embodiment, the first separation wall 624 includes at least one cooling hole 624' adapted to provide fluid communication between the rotor chamber 621 and the impeller chamber 610, so as to allow coolant to also flow in the impeller chamber 610. In other words, the cooling hole 624' passes through the first separation wall 624.

[0056] According to a preferred embodiment, shaft 3 includes an axial hole 300 that extends primarily along axis XX.

[0057] Preferably, the coolant flows inside the axial bore 300. Preferably, the axial bore 300 passes through the shaft 3.

[0058] According to a preferred embodiment, the pump assembly 6 includes a third housing 63 in which an electronic command board 5 is housed in a command chamber 630.

[0059] According to a preferred embodiment variation, the third housing 63 and the second housing 62 define an auxiliary cooling chamber 631 that is fluidly connected to the rotor chamber 621, such that coolant also reaches the auxiliary cooling chamber 631 in a fluid manner.

[0060] Specifically, according to a preferred embodiment, the second separation wall 623 includes a central portion 6231 that faces the command panel 5 in the region near the auxiliary cooling chamber 631.

[0061] According to a preferred embodiment, the second housing 62 and the third housing 63 are separated by a second separation wall 623.

[0062] In other words, the command chamber 630 and the stator chamber 622 are separated by a second separation wall 623. The second separation wall 623, together with the first separation wall 624, axially defines and tightly seals the motor chamber 620.

[0063] In a first preferred embodiment, the second separation wall 623 is included in the second housing 62.

[0064] In a second preferred embodiment, the second separation wall 623 is included in the third housing 61.

[0065] In another embodiment, a portion of the second separation wall 623 is included in the portion of the second housing 62 and another portion is included in the third housing 63.

[0066] According to a preferred embodiment, the second separation wall 623 includes at least one fluid channel adapted to fluidly connect the stator chamber 622 and the command chamber 630.

[0067] In a preferred embodiment, the second housing 62 includes an annular sidewall 627 extending parallel to the axis XX. Furthermore, the sidewall 627 radially defines a motor chamber 620, preferably a stator chamber 622.

[0068] Preferably, the sidewall 627 is tightly joined to the first separation wall 624 and the second separation wall 623.

[0069] As previously described, the second housing 62 includes an intermediate tubular wall 625 that extends parallel to the axis XX and is positioned between the rotor 41 and the stator 42, thereby dividing the motor chamber 620 into a rotor chamber 621 and a stator chamber 622.

[0070] According to a preferred embodiment, the intermediate tubular wall 625 includes a stator tubular surface 626 radially facing the stator 42 and a rotor tubular surface 626' radially facing the rotor 41.

[0071] According to a preferred embodiment, the intermediate tubular wall 625 extends along axis XX and includes: a first end 625', adjacent to the first housing 61, preferably tightly engaging the first separation wall 624 (preferably the motor surface 629); and a second opposing end 625'". Preferably, the second end 625' engages the bottom of the second housing 62. Preferably, the second end 625' is adjacent to the third housing 62, tightly sealing the second separation wall 623.

[0072] Therefore, according to a preferred embodiment, the intermediate tubular wall 625 (specifically its first end 625') divides the motor surface 629 into at least two distinct surfaces. Specifically, the intermediate tubular wall 625 divides the first separating wall 624 (and specifically the motor surface 629) into a rotor portion 6291 facing the rotor 41 axially and a stator portion 6292 facing the stator 42 axially.

[0073] In other words, the motor surface 629 includes the rotor portion 6291 and the stator portion 6292.

[0074] According to the present invention, pump assembly 1 includes thermally conductive resin.

[0075] Preferably, for example, the thermally conductive resin is a thermally conductive epoxy resin.

[0076] Preferably, for example, the thermally conductive resin is a two-component resin, such as one made of polydimethylsiloxane.

[0077] Specifically, the thermally conductive resin has high thermal conductivity and is therefore suitable for forming a preferred heat vector in the pump body 6. In other words, the placement of the thermally conductive resin facilitates the cooling of the motor 4 via heat conduction.

[0078] According to the invention, the thermally conductive resin at least partially covers the motor surface 629 included in the first separation wall 624 so as to cool the stator chamber 622 by thermal conduction.

[0079] Specifically, the first separation wall 624 (specifically, the impeller surface 628) is wetted and cooled by the coolant. Simultaneously, the first separation wall 624 also includes a stator portion 6292 facing the stator chamber 629. Therefore, the heat generated by the stator 62 heats the stator portion 6292.

[0080] Based on the above, there is a temperature gradient between the impeller surface 628 and the stator portion 6292, and the thermally conductive resin forms a preferential heat vector that influences the temperature gradient in order to guide the temperature gradient.

[0081] In other words, the heat generated by the stator 62 and present in the stator chamber 620 is the object of heat vectoring by the thermally conductive resin, and this heat is thus transferred from the stator chamber 620 to the impeller chamber 610 via thermal conduction through the first separation wall 624.

[0082] According to a preferred embodiment, thermally conductive resin at least partially covers the stator tubular surface 626 to cool the stator chamber 620 by thermal conduction.

[0083] Specifically, a temperature gradient exists on the intermediate tubular wall 625 between the stator tubular surface 626 and the rotor tubular surface 626', the stator tubular surface being heated by heat present in the stator chamber 622, and the rotor tubular surface being cooled by coolant flowing in the rotor chamber 621. Heat transfer from the stator chamber 622 to the rotor chamber 621 occurs via heat conduction through the intermediate tubular wall 625, and the presence of the thermally conductive resin facilitates this heat exchange.

[0084] According to another preferred embodiment, the thermally conductive resin at least partially covers the second separation wall 623 so as to cool the command chamber 630 by thermal conduction.

[0085] In a preferred embodiment, the electronic command board 5 is housed in the command chamber 630 in the region near the second separation wall 624.

[0086] In a preferred embodiment variant, the electronic instruction board 5 is fixed (e.g., bolted or glued) to the second separation wall 623.

[0087] In a preferred embodiment, thermally conductive resin is placed between the second separation wall 623 and the electronic instruction board 5.

[0088] Thus, the heat transfer through the second separation wall 623, occurring within the command chamber 630, is optimized. In other words, the electronic command board 5 is cooled more effectively due to the presence of the thermally conductive resin covering the second separation wall 623.

[0089] In a preferred embodiment variant, the electronic instruction board 5 is fixed (e.g., bolted or glued) to the second separation wall 623, and thermally conductive resin is also placed around the electronic instruction board 5.

[0090] According to a preferred embodiment, thermally conductive resin at least partially covers the central portion 6231 facing the command chamber 630 in order to cool the command chamber 630 by convection.

[0091] Specifically, at this time, there is a temperature gradient between the central part 6231 heated by the heat generated by the electronic instruction board 5 and the auxiliary cooling chamber 631 cooled by the coolant.

[0092] In other words, the electronic instruction board 5 is cooled more effectively to a greater extent.

[0093] According to a preferred embodiment, in the above embodiment, the thermally conductive resin is positioned on the aforementioned wall in the form of a film.

[0094] In other words, the thermally conductive resin is positioned on the relevant wall with minimal thickness.

[0095] In other embodiments, the thermally conductive resin is positioned as a layer on the aforementioned walls and surfaces. Therefore, unlike the aforementioned embodiments where it is in the form of a film, it has a greater thickness.

[0096] Specifically, preferably, the thickness of the thermally conductive resin is such that the thermally conductive resin contacts the corresponding wall on one side and contacts the surface included in the facing component (e.g., the surface of the stator) on the other side.

[0097] According to a preferred embodiment, for example Figure 2 As shown, the thermally conductive resin is positioned to axially contact the motor surface 629 and the upper surface of the stator 41, such as the entire upper surface of various stator coils.

[0098] According to a preferred embodiment, the thermally conductive resin is positioned to radially contact the stator tubular surface 626 and the inner surface of the stator 41.

[0099] Therefore, in these preferred embodiments, the presence of the thermally conductive resin allows for direct heat transfer, thereby connecting and contacting the respective walls and surfaces. In other words, the presence of air between the relevant walls and surfaces is eliminated.

[0100] According to a preferred embodiment, air is present in the stator chamber 622 and preferably in the command chamber 630, in addition to the area where the thermally conductive resin is present.

[0101] In a preferred embodiment variant, the stator chamber 622 and preferably the command chamber 630 are filled with oil to cool the stator 62 and preferably the electronic command board 5, respectively, by convection. In other words, the oil wets the areas where the thermally conductive resin is present.

[0102] In other words, the stator 62 and preferably the electronic command board 5 are in an oil bath.

[0103] Furthermore, the oil comes into contact with the thermally conductive resin and transfers heat present in the stator chamber 622 and preferably the command chamber 630 to the thermally conductive resin through convection.

[0104] In other words, the combination of oil and thermally conductive resin further improves the cooling of the entire electronic component.

[0105] In one embodiment, oil is present in a certain amount in stator chamber 622 and command chamber 630 such that the oil contacts the thermally conductive resin in any orientation of the pump assembly within the vehicle.

[0106] Preferably, the oil is dielectric, meaning that it does not allow current to conduct through it.

[0107] Preferably, the third housing 63 includes a sealing cover 635 adapted to tightly seal the command chamber 630 that houses the electronic command board 5.

[0108] In a third preferred embodiment variant, the stator chamber 622 and preferably the command chamber 630 are completely filled with thermally conductive resin. In other words, the stator 62 and preferably the electronic command board 5 are immersed in the thermally conductive resin.

[0109] Thus, the cooling of the entire electronic component is further improved by the presence of thermally conductive resin that completely covers the stator 62 and preferably the electronic instruction board 5.

[0110] According to a preferred embodiment, it should be noted that the second separation wall 623 includes at least one fluid channel 623' adapted to fluidly connect the stator chamber 622 and the command chamber 630.

[0111] Preferably, the fluid channel 623' is adapted to facilitate heat exchange between the stator chamber 622 and the command chamber 630. Preferably, the heat exchange is carried out via a thermally conductive resin or via oil.

[0112] According to a preferred embodiment, the thermally conductive resin is positioned in a substantially fluid form on the desired wall or inside the desired room for polymerization and then curing.

[0113] According to a preferred embodiment, the viscosity of the thermally conductive resin in fluid form is less than 1700 mPa*s (or 1700 cP).

[0114] According to a preferred embodiment, the thermally conductive resin has an electrical conductivity greater than 0.3 W / mK, preferably 0.5 W / mK.

[0115] According to a preferred embodiment, the thermally conductive resin has the fastest possible polymerization time. Preferably, the thermally conductive resin in fluid form, at a temperature between 25°C and 50°C, is polymerized within a time period between 3 hours and 20 minutes.

[0116] According to a preferred embodiment, the polymerized thermally conductive resin is essentially rubbery, i.e., it is not rigid.

[0117] According to this preferred embodiment, the thermally conductive resin is used as a vibration damping element, and the thermally conductive resin preferably has rubber properties.

[0118] Innovatively, the pump unit fully achieved its intended purpose by overcoming typical problems of existing technologies.

[0119] Advantageously, the pump assembly includes a thermally conductive resin covering the surface of the pump body near the heated components (specifically the stator, rotor, and command electronics), thereby facilitating cooling of the components by heat conduction and promoting heat exchange between the high-temperature components and the "hydraulic section" of the pump body.

[0120] Advantageously, the heat generated by the electronic components is effectively conducted and transferred through the thermally conductive resin.

[0121] Advantageously, the combination of oil and thermally conductive resin allows for enhanced cooling of the heated component, thereby facilitating cooling of the component by convection.

[0122] Advantageously, thermally conductive resins help suppress vibration.

[0123] Advantageously, in the pump assembly of the present invention, the "insulation" effect is generally greatly reduced due to the presence of space in which air is present. In fact, advantageously, the possibility of air forming an insulating barrier to the heat generated by the stator and / or command plate is eliminated.

[0124] Advantageously, the presence of stator chambers and command chambers completely filled with thermally conductive resin allows for enhanced cooling of the heated components, thereby facilitating cooling of the components by thermal conduction.

[0125] Advantageously, the thermally conductive resin allows the pump unit to operate at a uniform temperature. Advantageously, the presence of oil in the stator chamber and command chamber allows for uniform temperature.

[0126] Advantageously, the pump assembly of the present invention has greater power than known pump assemblies of the same size. Advantageously, the pump assembly of the present invention has a more compact size than known pump assemblies of the same power.

[0127] Advantageously, the pump unit can be positioned inside the vehicle in any spatial location.

[0128] It is obvious that those skilled in the art can make changes to the invention as described above to meet occasional needs, all of which fall within the scope of protection defined in the appended claims.

Claims

1. A pump assembly (1) for a cooling system of a vehicle's operating assembly, the pump assembly extending relative to an axis (XX) and comprising: i) Impeller (2), which can rotate around the axis (XX); ii) Shaft (3), which extends along the axis (XX) and is operatively connected to the impeller (2); iii) An electric motor (4) comprising: a rotor (41) integrally mounted on the shaft (3); and a stator (42) axially and circumferentially surrounding the rotor (41). iv) Pump body (6), along the axis (XX), includes: - A first housing (61), in which the impeller (2) is housed in an impeller chamber (610) in which the cooling fluid circulates; - A second housing (62) in which the motor (4) is housed in a motor chamber (620), wherein the second housing (62) includes an intermediate tubular wall (625) extending parallel to the axis (XX) and positioned between the rotor (41) and the stator (42), such that the rotor chamber (621) and the stator chamber (622) are defined in the motor chamber (620) and sealed to each other, wherein the first housing (61) and the second housing (62) are separated by a first separating wall (624) including an impeller surface (628) axially facing the impeller (2) and a motor surface (629) axially facing the motor (4). - A third housing (63) in which an electronic command board (5) is housed in a command chamber (630), wherein the second housing (62) and the third housing (63) are separated by a second separation wall (623), and the electronic command board (5) is housed in a region close to the second separation wall (623); The intermediate tubular wall (625) is sealed to the first separation wall (624) and the second separation wall (623). The pump assembly (1) is characterized in that it includes a thermally conductive resin that at least partially covers the motor surface (629) to cool the stator chamber (622) via heat conduction through the motor surface (629), and the thermally conductive resin at least partially covers the second separation wall (623) to cool the command chamber (630) via heat conduction through the second separation wall (623), wherein the thermally conductive resin is located between the second separation wall (623) and the electronic command board (5); The thermally conductive resin is also used as a vibration damping element. The stator chamber (622) is filled with a certain amount of oil to cool the stator (42) through convection; and The second separation wall (623) includes at least one fluid channel (623') adapted to fluidly connect the stator chamber (622) to the command chamber (630).

2. The pump set (1) according to claim 1, wherein, The operating group is the vehicle's engine group.

3. The pump set (1) according to claim 1, wherein, The motor surface (629) includes a rotor portion (6291) facing the rotor (41) axially and a stator portion (6292) facing the stator (42) axially, wherein the thermally conductive resin at least partially covers the stator portion (6292) to cool the stator chamber (622) via thermal conduction through the stator portion (6292).

4. The pump assembly (1) according to any one of the preceding claims, wherein, The intermediate tubular wall (625) includes a stator tubular surface (626) facing the stator (42) radially and a rotor tubular surface (626') facing the rotor (41) radially, wherein the thermally conductive resin at least partially covers the stator tubular surface (626).

5. The pump assembly (1) according to any one of claims 1-3, wherein, The rotor chamber (621) is fluidly connected to the impeller chamber (610), and wherein the third housing (63) and the second housing (62) define an auxiliary cooling chamber (631) fluidly connected to the rotor chamber (621), such that coolant also reaches the auxiliary cooling chamber (631) in a fluid manner.

6. The pump set (1) according to claim 5, wherein, The second separation wall (623) includes a central portion (6231) facing the electronic command board (5) in a region near the auxiliary cooling chamber (631), wherein the thermally conductive resin at least partially covers the central portion (6231) to cool the command chamber (630) via heat conduction through the central portion (6231).

7. The pump assembly (1) according to any one of claims 1-3, wherein, The command chamber (630) is filled with a certain amount of oil to cool the electronic command board (5) by convection.

8. The pump set (1) according to claim 7, wherein, The third housing (63) includes a sealing cover (635) that tightly seals the command chamber (630).

9. The pump assembly (1) according to any one of claims 1-3, wherein, The oil is dielectric.

10. The pump assembly (1) according to any one of claims 1-3, wherein, The thermally conductive resin positioned on the aforementioned walls and surfaces is in the form of a film.

11. The pump assembly (1) according to any one of claims 1 to 3, wherein, The thermally conductive resin positioned on the aforementioned walls and surfaces is in the form of a layer, and the thickness of the thermally conductive resin is such that the thermally conductive resin contacts the corresponding wall on one side and contacts the surface included in the facing component on the other side.

12. The pump set (1) according to claim 11, wherein, The surface is the surface of the stator.

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