Electric pump and temperature control system

Abstract

The invention relates to an electric pump (200) for pumping a medium, in particular a liquid medium. The invention relates to an electric pump (200) comprising a stator (210), which is arranged in a dry chamber (202) and has a stator winding (212), a rotor (220), which is arranged in a wet chamber (201), a conveying device (230), which is connected in a rotationally fixed manner to the rotor (220), for sucking and discharging a medium, and a housing component (240), which is in thermal contact with an assembly (210, 350) of the pump (200) to be cooled, the housing component (240) at least partially surrounds the stator (210) on a side of the stator (210) facing away from the rotor (220), the housing component (240) being provided as a deep drawing component. The invention further relates to a temperature control system (300) having such a pump (200).

Description

Technical Field

[0001] The present invention relates to an electric pump and a temperature control system having such a pump, particularly for use in vehicles. Background Technology

[0002] Electric pumps traditionally have an electric motor, which has a stator and a rotor that carries the pump's conveying mechanism. Figure 1 An embodiment of such a pump is shown and is generally indicated by 100.

[0003] The rotor 120, together with the conveying mechanism 130, is arranged in the wet chamber 101 (i.e., a cavity through which the medium to be pumped flows, at least temporarily and / or partially or completely), while the stator 110 is typically arranged in the dry chamber 102, i.e., outside the wet chamber 101. The wet chamber 101 and the dry chamber 102 are separated by a substantially hollow cylindrical member 160 (also referred to as a "can" or "pot"). The aforementioned member can conventionally be received together in the pump housing 140. For example, the pump housing 140 can have a sleeve 144 surrounding the stator 110 in the radial direction and a cover 146 on the dry chamber side and a cover 142 on the wet chamber side.

[0004] Pump housing 140 is conventionally configured to secure pump 100 to an upper-level structure, and particularly to components supplied with the medium to be pumped. Furthermore, power electronics and / or control electronics 150 for supplying the pump can be housed within pump housing 140. Typically, pump housing 140 can also be configured to remove heat from stator 110 and, if necessary, from other components 150. In the comparative example shown here, the dry chamber side cover 146 is equipped with cooling ribs for this purpose, and a thermally conductive medium 170, such as thermal paste, is introduced between the components 110, 150 to be cooled and the cover 146. The dry chamber side cover 146 can, for example, be provided as an aluminum injection molded part in conventional pump 100 to ensure sufficient cooling efficiency for the electronics 150. Alternatively, a water-cooling structure (not shown here) can also be integrated into cover 146 in conventional pumps.

[0005] To prevent the medium to be pumped from entering the dry chamber 102 or leaking from the wet chamber 101 into the surrounding environment, multiple seals 145 are typically provided, particularly between the cover 144 and the cover 146 on the dry chamber side of the pump housing 140, and at the connection between the tank 160 and the cover 144, and between the tank 160 and the cover 142 on the wet chamber side. In the comparative example shown, the inlet 181 and outlet 185 are integrated into the cover 142 on the wet chamber side, through which the medium to be pumped can be drawn in or discharged by the conveying mechanism 130. The components 142, 144, and 146 of the pump housing 140 are fastened to each other by means of screws 148. Summary of the Invention

[0006] According to the invention, an electric pump with the features of the independent claims and a temperature control system having such a pump, particularly for vehicles, are proposed. Advantageous designs are the subject of the dependent claims and the following description.

[0007] To improve upon existing technologies, this invention proposes the design of a housing component that is in thermal contact with the pump's components to be cooled, particularly the stator and / or power electronics. This housing component is a deep-drawn part made of a metal sheet. This design of the housing component enables efficient heat dissipation from the components to be cooled, making it possible to abandon traditional pump housings, especially the housing cover mentioned earlier designed for cooling electronic components.

[0008] Deep-drawn components offer significant advantages over traditionally used castings in terms of manufacturing costs and the tooling and machining expenses involved in the manufacturing process. In particular, deep-drawing tools wear out more slowly than casting tools. Furthermore, there is no need to wait for a long cooling time after manufacturing deep-drawn parts; the components can be directly formed and further processed.

[0009] In detail, an electric pump for pumping media, particularly liquid media, is proposed, the electric pump having a stator with stator windings arranged in a dry chamber, a rotor arranged in a wet chamber, a conveying mechanism for drawing in and discharging media that is anti-rotationally connected to the rotor, and a housing member designed as a deep-drawn member, wherein the housing member is configured to exhaust heat from the stator and / or from at least one other component of the pump, particularly the power and / or control electronics energizing the stator.

[0010] According to at least one design, the housing member is further configured to, at least partially or at least at the location of the wet chamber, separate the dry chamber. Thus, the housing member is at least partially in contact with the medium pumped by the pump, and correspondingly, heat derived from the stator and / or other components can be at least partially transferred to the medium. This results in particularly efficient cooling of the corresponding components in thermal contact with the housing member.

[0011] Here, the housing member can work in a sealing manner with the gap sleeve arranged between the rotor and stator, such that a section of the housing member, together with the gap sleeve, forms a can that separates the wet chamber from the dry chamber. This facilitates the manufacture of the housing member by deep drawing, as it is not necessary to achieve complete separation between the wet and dry chambers through the housing member. It is well known that the gap sleeve is a sleeve that separates the rotor and stator, or is arranged in the (air) gap between the rotor and stator.

[0012] According to at least one design, the housing component is further configured to support the stator and at least substantially (i.e., more than 50%, preferably more than 75%) or completely support or derive the torque acting on the stator. The torque acting on the stator originates, for example, primarily from the flow resistance generated by the medium conveyed by the pump's conveying mechanism due to inertia and friction on the conveying mechanism.

[0013] Furthermore, a temperature control system is proposed, the temperature control system having a pump and at least one component, the pump supplying a medium to the component, wherein the at least one component is configured to receive heat from the medium and / or output heat to the medium.

[0014] According to at least one design scheme, electronic devices for supplying and / or controlling the stator are arranged in the dry chamber. This allows for particularly short conduit paths and an overall compact construction. The connection between the electronic devices and the stator, or stator windings, can be manufactured, for example, using IDC (insulation displacement contact; SKV, Schneid-Klemm-Verbindung, clip-on connection) or EPT (press-in technology).

[0015] As already mentioned, the housing component is specifically designed to transfer heat from the stator and / or (if present in the dry chamber) from the electronics to the medium in the wet chamber. This ensures efficient cooling of heat-related components without additional structural costs. Specifically, it eliminates the need for dedicated cooling of components thermally connected to the medium in the wet chamber via the housing component. Optionally, a thermal interface medium (TIM; e.g., aluminum-containing thermal paste) can be introduced between the housing component and the stator or electronics to ensure uniform and reliable heat transfer. For example, the housing component can have a material with high specific thermal conductivity at the corresponding thermal contact areas (e.g., in the form of a thermally conductive profile embedded in a first material of the housing component, the profile being composed of a second material having a higher thermal conductivity than the first material). This further improves the efficiency of heat transfer.

[0016] According to at least one design, the housing member has teeth for an anti-rotational connection between the housing member and the stator. Therefore, higher torque can be extracted from the stator via the housing member, thereby increasing the maximum pumping power that the pump can provide.

[0017] According to at least one design, the housing member has a support for supporting support pins for the rotor. The support can, for example, form a robust clamping structure for supporting the support pins. The rotor can be rotatably supported at the support pins, for example by means of one or more rolling or sliding bearings. Therefore, the housing member can accommodate the rotor load in addition to the stator torque.

[0018] According to at least one design, the housing member has a bearing for supporting the rotor shaft. The bearing can be constructed as a rolling bearing or a sliding bearing and directly connected to the housing member, for example, by press-fit or material-locking connection.

[0019] According to at least one design, the aforementioned temperature control system is connected to the pump via inlet and outlet portions that can be integrated into a cover on the wet chamber side of the pump. Specifically, the wet chamber side cover can be configured to carry the housing component and be configured to support the torque emanating from the stator through the housing component. Therefore, the wet chamber side cover of the pump serves not only as a fluid-technical connection between the pump and the rest of the temperature control system, but also as a mechanical connection between them. The wet chamber side cover can also be configured to mechanically secure the pump (e.g., by means of a tightening structure at another component of the temperature control system or at the device including the temperature control system).

[0020] According to at least one design, the housing component is pressed and / or screwed and / or form-locked and / or material-locked to the cover on the wet chamber side. This is a particularly stable connection that can be easily established at the same time.

[0021] According to at least one design, a seal is arranged between the housing component and the cover on the wet chamber side, the seal sealing the wet chamber relative to the dry chamber and / or the pump's surrounding environment. This ensures the pump, or temperature control system, maintains its functionality with minimal maintenance costs.

[0022] Alternatively, the housing member can be designed so that no seal is needed between the housing member and the cover on the wet chamber side, thus the housing member and the cover seal together. In particular, the housing member can also be fluid-tightly mounted at the aforementioned clearance sleeve and / or fluid-tightly mounted at the plug housing where power to the electronics can be provided, thereby completely eliminating the need for separate seals, such as O-rings. This further reduces the cost of the pump.

[0023] According to at least one design, the cover on the wet chamber side is further configured to isolate the dry chamber at least partially from the pump's surrounding environment. Therefore, the stator and, if necessary, the electronics arranged in the dry chamber can also be protected from external influences (e.g., dust, moisture, mechanical stress, etc.).

[0024] The design, which is independent of the cover on the wet chamber side, allows for the installation of a cover (on the dry chamber side) that is fastened to the cover and / or housing components on the wet chamber side and isolates the dry chamber from the pump's surrounding environment, for example, to prevent moisture and / or contaminants (e.g., dust) from entering the dry chamber.

[0025] Regardless of the specific design of the temperature control system, it is possible to use the medium delivered by the pump to temperature-regulate the components of the temperature control system before the medium is returned to the pump. For this purpose, the temperature control system can, for example, have one or more heat exchangers that transfer heat from the medium to the component to be temperature-regulated (for heating the component), and / or transfer heat from the component to be temperature-regulated to the medium (for cooling the component). Alternatively or additionally, one or more heat exchangers can be provided that transfer heat from the medium to the environment surrounding the temperature control system, and / or vice versa, transfer heat from the environment to the medium.

[0026] In at least one design, one or more of such temperature-regulating components can be vehicle components, such as, in particular, electric drive units and / or traction batteries and / or vehicle cabs and / or computing units, such as vehicle controllers.

[0027] Further advantages and design schemes of the present invention can be obtained from the specification and drawings. Attached Figure Description

[0028] The invention is schematically illustrated with reference to the embodiments shown in the accompanying drawings, and will now be described with reference to the drawings. Wherein: Figure 1 An electric pump, not according to the present invention, is shown in exploded views and perspective views. Figure 2 A schematic side sectional view illustrates the design of the electric pump, as it can be used in the design of this invention. Figure 3 Another embodiment of the electric pump according to the invention is shown. Detailed Implementation

[0029] Figure 1 As already described at the beginning.

[0030] exist Figure 2 The design of the electric pump is shown in a schematic side cross-sectional view, as the electric pump can be used in the design of the present invention, and is generally indicated by 200.

[0031] Pump 200 has a stator 210 with stator windings 212 in a dry chamber 202. A rotor 220 is arranged within the stator 210 in a wet chamber 201. The stator 210 and rotor 220 together form an electric motor that drives the pump 200. The rotor 220 is particularly capable of having permanent magnets; in other words, the electric motor is especially a permanently excited motor.

[0032] The wet chamber 201 is separated from the dry chamber 202 by a substantially hollow cylindrical gap sleeve 260 and a housing member 240 that works in a sealing manner with the gap sleeve. The housing member 240 is configured to mechanically support the stator 210 and is particularly capable of having teeth 265, which, for example, can engage with corresponding teeth in the stator core.

[0033] A conveying mechanism 230 is further arranged in the wet chamber 201, which is connected to the rotor 220 in a rotationally resistant manner. For example, the conveying mechanism 230 can be provided in the form of an impeller or turbine. The rotor 220 itself is rotatably supported relative to the stator 210. In the embodiment shown here, a support pin 225 is rigidly fastened or fixedly clamped into the housing member 240 for this purpose, wherein a bearing 227, such as a rolling bearing or a sliding bearing, is arranged between the rotor 220 and the support pin 225, which allows relative rotation between the support pin 225 and the rotor 220.

[0034] The clearance sleeve 260 can be made, for example, partially or entirely of thermoplastic plastic (e.g., using casting and / or additive manufacturing methods), and / or can be manufactured using one or more metallic materials, such as aluminum or (stainless) steel (e.g., by sheet molding and / or using casting and / or additive manufacturing methods). The housing member 240 is provided as a deep-drawn member, for example, made of sheet metal, particularly aluminum or steel, particularly stainless steel, and in the illustrated embodiment extends into the wet chamber 202 with a first heat exchange surface 248. Thus, the housing member 240 can transfer heat to the medium flowing through the wet chamber 202. The housing member 240 can be mated with the clearance sleeve 260, for example, by fusion welding, bonding, or brazing, depending on the material. Alternatively, the seal between the clearance sleeve 260 and the housing member 240 can also be achieved by mechanically tightening the two parts relative to each other.

[0035] Pump 200 and Figure 1 The difference between the conventional pump 100 shown is particularly that the housing member 240 carrying the stator 210 is in direct contact with the fluid pumped by the pump, and therefore does not require heat dissipation through a housing cover (also referred to herein as cover 320) on the dry chamber side. Therefore, the conventional design requires a cooling body, and thus a housing cover 146 that is structurally and materially more expensive, while the design according to the invention can forgo such an external cooling body, and therefore can use a significantly less complex housing cover 320.

[0036] As in Figure 2 The pump 200 shown in the image has a cover on the wet chamber side, also indicated by 142 (the cover is from...). Figure 1 The cover 142 of the conventional pump 100 is substantially the same as that of the pump 100. The pump 100 is mechanically and fluidically connected to the pump 100, and is connected to other components of the corresponding temperature control system (referred to here as 300) via the cover 142 on the wet chamber side.

[0037] In the illustrated embodiment, a seal 345, such as an elastomeric seal like an O-ring, is arranged between the sealing surfaces of the clearance sleeve 360 ​​and the cover 142 to seal the wet chamber 201 relative to the surrounding environment of the pump 200 and / or relative to the dry chamber 202. However, in suitable designs of the housing member 240, as already mentioned, this seal 345 can also be omitted, especially when the section 249 of the housing member 240, which interacts with the cover 142 as shown here, is made sufficiently precisely to satisfy the sealing function, unlike the case where it interacts with the clearance sleeve 260. For this purpose, the deep-drawn member 240 can also be reworked, for example by machining (e.g., by milling, turning, grinding, honing, etc.), to obtain sufficient surface quality in terms of geometry and / or surface quality (flatness, roughness, etc.).

[0038] Furthermore, in the illustrated embodiment, a cover 320 is provided that isolates the dry chamber 202 of the pump 200 from its surrounding environment and is mechanically connected to a housing 144, which, in the illustrated embodiment, surrounds the housing member 240. In the illustrated embodiment, a plug housing 250 for electrically supplying the pump 200 is integrated into the housing 144. The plug housing is fluid-tightly connected to the housing member 240, preventing fluid (and therefore other contaminants, such as dust) from entering the dry chamber 202 from outside the pump 200. Unlike the illustrated embodiment, the housing surrounding the housing member on the side opposite to the stator 210 can be integrally, particularly monolithically, constructed with a gap sleeve 260, thereby gaining advantages in sealing the wet chamber 201 and the dry chamber 202. For example, this monolithic component can be provided as an injection-molded part made of thermoplastic plastic.

[0039] In the illustrated embodiment, in addition to the stator 210, electronic devices 350 (e.g., in the form of a printed circuit board equipped with electronic components) for supplying electrical power to and / or controlling the stator 210 are also arranged in the dry chamber 202. In the illustrated embodiment, the electronic devices 350 are arranged at the end of the housing member 240 and are in thermal contact with the housing member 240, so that the housing member 240 can transfer heat from the electronic devices 350 to the medium circulating in section 248. To improve the efficiency of this heat transfer, a thermally conductive medium 370, such as a thermal paste containing aluminum, is introduced between the electronic devices 350 and the housing member 240.

[0040] exist Figure 3In one embodiment of the electric pump 200, a housing member 240 is constructed as a deep-drawn member in the shape of a can. The housing member 240 has an axial shoulder 24, the outer diameter of which is smaller than the outer peripheral wall 244 of the housing member 240, which radially abuts against the stator 210. Here, the axial shoulder 24 has a bottom surface 26, which is circularly constructed and thermally abuts against the electronic device circuit board 30 of the electronic device 350. An annular bottom ring 28 is arranged radially around the bottom surface 26 at a staggered axial spacing, extending radially to the peripheral wall 244 of the housing member 240. The housing member 240 thus has a stepped bottom 25, wherein a sufficiently large structural space is constructed between the annular bottom ring 28 and the electronic device circuit board 30 so that larger electronic components 31 are also arranged on the electronic device circuit board 30 facing the stator 210. Here, the annular bottom ring 28 preferably extends over the entire radial extension of the stator 210, which has the electrical stator windings 212. Therefore, the outer peripheral wall 244 is in direct radial thermal contact with the stator base 21, and the bottom surface 26 of the axial shoulder 24 is in direct axial thermal contact with the electronic circuit board 30. The bottom surface 26 forms the inner wall of the wet chamber 201 relative to the electronic circuit board 30 and is directly flushed with a liquid cooling medium. This effectively dissipates heat not only from the electronic circuit board 30 but also from the stator base 21. To construct the wet chamber 201, a gap sleeve 260 is axially inserted into the support 20 within the axial shoulder 24 and is liquid-tightly sealed relative to the inner wall of the axial shoulder 24. The gap sleeve 260 extends axially over the entire axial dimension of the stator 210. At the end opposite the bottom surface 26 along the axial direction, the clearance sleeve 260 has an annular top surface 249 that radially covers the stator 210. The annular top surface 249 then transitions axially to a cover 144 on the outside of the stator 210, which axially overlaps the peripheral wall 244 of the housing member 240 in the region of the stator base 21. The cover 144 provides a liquid-tight seal relative to the cover 142, such that the stator 210, together with the electronics 350, is sealed as a dry chamber 202 relative to the wet chamber 201 of the rotor 220. In the region of the axial shoulder 24, a support receiving portion 40 for the rotor 220 is constructed radially within the clearance sleeve 260. Here, for example, the rotor shaft 22 is anti-rotationally secured in the support receiving portion 40, wherein the rotor 220, together with the conveying mechanism 230, is rotatably arranged on the rotor shaft 22. Specifically, the gap sleeve 260 is integrally constructed with the support receiving portion 40, for example, as a plastic injection molding component. An axial opening 44 is constructed between the support receiving portion 40 and the inner side of the bottom surface 26 so that the bottom surface 26 can be flushed with a cooling medium.The bottom surface 26 of the axial shoulder 24 is constructed flat over its entire diameter and thermally abuts against the electronic device circuit board 30.

[0041] Regardless of the specific design of the temperature control system 300, the medium delivered by pump 200 can be used to temperature control components of the temperature control system 300 (not shown separately in the figure) before being returned to pump 200. For this purpose, the temperature control system 300 can, for example, have one or more heat exchangers (not shown) that transfer heat from the medium to the component to be temperature controlled (to heat the component), and / or transfer heat from the component to be temperature controlled to the medium (to cool the component). Alternatively or additionally, one or more heat exchangers can be provided that transfer heat from the medium to the environment surrounding the temperature control system 300, and / or vice versa, transfer heat from the environment to the medium.

[0042] In at least one design, one or more of such temperature-regulating components can be vehicle components, such as, in particular, electric drive units and / or traction batteries and / or vehicle cabs and / or computing units, such as vehicle controllers.

Claims

1. An electric pump (200) for pumping media, especially liquid media, having: A stator (210) having stator windings (212), the stator being arranged in a dry compartment (202), Rotor (220), which is arranged in a wet chamber (201), A conveying mechanism (230) is anti-rotationally connected to the rotor (220), the conveying mechanism being used to draw in and discharge the medium, and The housing component (240) is in thermal contact with the components (210, 350) of the electric pump (200) that are to be cooled. in, The housing member (240) at least partially surrounds the stator (210) on the side of the stator (210) opposite to the rotor (220), and The housing component (240) is provided as a deep-drawing component.

2. The electric pump (200) according to claim 1, further comprising a clearance sleeve (260) disposed between the stator (210) and the rotor (220), and configured to work in conjunction with the housing member (240) to separate the dry chamber (202) from the wet chamber (201).

3. The electric pump (200) according to claim 2, wherein, The gap sleeve (260) is integrally constructed with the cover (144), particularly as a whole, the cover at least partially surrounding the housing member (240) on the side opposite to the stator (210), and the cover (144) extends approximately axially to the middle of the stator base (21) of the stator (210).

4. The electric pump (200) according to any one of the preceding claims, wherein, The housing member (240) is configured to carry the stator (210) and generate torque acting on the stator (210).

5. The electric pump (200) according to any one of the preceding claims, wherein, Electronic devices (350) for supplying and / or controlling the stator (210) are arranged in the dry chamber (202), and the electronic devices have electronic device circuit boards (30).

6. The electric pump (200) according to any one of the preceding claims, wherein, The housing component (240) is configured to transfer heat from the stator (210) and / or, at least in accordance with claim 5, from the electronics (350) to the medium in the wet chamber (201).

7. The electric pump (200) according to any one of the preceding claims, wherein, The housing member (240) has teeth (265) for anti-rotation connection between the housing member (240) and the stator (210).

8. The electric pump (200) according to any one of the preceding claims, wherein, The housing component (240) is at least partially made of a metal plate, especially an aluminum plate and / or a steel plate and / or a stainless steel plate, preferably as a can-shaped component, the bottom (25, 26) of which abuts against the electronic device circuit board (30).

9. The electric pump (200) according to any one of the preceding claims, wherein, The housing member (240) has a support for supporting a support pin (225) for the rotor, wherein, in particular, the rotor (220) is rotatably supported at the support pin (225).

10. The electric pump (200) according to any one of the preceding claims, having a wet chamber side cover (142) configured to deliver the medium to the electric pump (200) and / or to discharge the medium from the electric pump (200).

11. The electric pump (200) according to at least claim 4, wherein, The cover (142) on the wet chamber side carries the housing member (240) and is configured to support the torque derived from the stator (210) through the housing member (240).

12. The electric pump (200) according to claim 11 or 12, wherein, The housing component (240) is pressed and / or tightened and / or shape-locked and / or material-locked to the cover (142) on the wet chamber side.

13. The electric pump (200) according to any one of the preceding claims, wherein, The housing component (240) has an axial shoulder (24), the bottom surface (26) of which is in thermal contact with the electronic device circuit board (30), and the electronic device circuit board (30) extends radially beyond the outer periphery of the axial shoulder (24), and in particular, a free structural space is constructed radially beside the axial shoulder (24) and in the axial region of the axial shoulder (24), in which at least one electronic device component (31) of the electronic device circuit board (30) can be arranged as needed.

14. The electric pump (200) according to any one of the preceding claims, wherein, The inner side of the axial shoulder (24) forms a columnar support (20) for receiving the gap sleeve (260), the gap sleeve being particularly liquid-tightly sealed relative to the support (20).

15. The electric pump (200) according to any one of the preceding claims, wherein, The bottom (25) of the housing component (240) has an annular bottom ring (28) around the bottom surface (26) of the axial shoulder (24), the bottom ring being arranged axially offset relative to the bottom surface (26) of the axial shoulder (24), and in particular the bottom ring (28) extending radially over the entire radial extension of the stator (210).

16. The electric pump (200) according to any one of the preceding claims, wherein, The support receiving portion (40) for the rotor shaft (22) is formed radially within the clearance sleeve (260), particularly integrally with the clearance sleeve, and the support receiving portion (40) extends axially into the axial shoulder (24).

17. A temperature control system (300) comprising an electric pump (200) according to any one of the preceding claims and at least one component, wherein the electric pump (200) supplies a medium to the at least one component, wherein, The at least one component is configured to receive heat from the medium and / or output heat to the medium.

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