Electronic water pump, thermal management system and vehicle

Abstract

The utility model discloses an electronic water pump, a heat management system and a vehicle, the electronic water pump comprises a shell and a rotating shaft, and the shell is an injection molding body and is provided with a containing cavity; the rotating shaft is located in the containing cavity, the end of the rotating shaft is connected with the cavity bottom wall at the axial end of the containing cavity, a bottom wall groove extending around the rotating shaft is formed in the surface of the side, back on to the containing cavity, of the cavity bottom wall, and reinforcing ribs are arranged in the bottom wall groove. The reinforcing ribs are provided with first ends connected with the inner peripheral wall of the bottom wall groove and second ends connected with the outer peripheral wall of the bottom wall groove, and the number of the second ends is larger than that of the first ends. The device is good in effect of preventing the rotating shaft from displacing, high in structural strength and capable of meeting increasingly stringent blasting test requirements.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic water pump technical field, more specifically, relate to an electronic water pump, thermal management system and vehicle. BACKGROUND

[0002] Electronic water pump is widely used because of high efficiency, accurate control and other advantages. In the related art, the shaft of the electronic water pump is generally wrapped by injection molding material at one end when the shell is injection molded, realizing the connection and fixation of the shaft and the shell.

[0003] The shaft is subjected to axial force and radial force when working, and the shaft is metal and is not easy to deform. However, if the strength of the position where the shell is connected with the shaft is not enough, deformation will occur, causing the shaft to move relative to the accommodating cavity (for example, translation in the axial and radial directions, or tilting caused by rotation of the shaft), especially in the vibration working condition, the deformation amount is larger, and the movement of the shaft will cause the rotating rotor impeller assembly to tilt and move upward, which brings great risk to the reliability of the electronic water pump. The accommodating cavity of the electronic water pump generally has a requirement for burst test, and the pressure is very high during the test. If the strength of the part of the shell near the one end of the shaft is not enough, it is very likely to be damaged during the burst test. SUMMARY

[0004] The utility model aims at at least solving one of the technical problems existing in the prior art. Therefore, one purpose of the utility model is to provide an electronic water pump, improve the anti-deformation ability of the position where the shell is connected with the shaft, and has high structural strength, which can meet the increasingly stringent burst test requirements.

[0005] Another purpose of the utility model is to provide a thermal management system with the above-mentioned electronic water pump.

[0006] Another purpose of the utility model is to provide a vehicle with the above-mentioned thermal management system.

[0007] According to the electronic water pump of the utility model embodiment, the shell is an injection molded body and has an accommodating cavity; the shaft is located in the accommodating cavity and the end of the shaft is connected with the cavity bottom wall at the axial end of the accommodating cavity, the side surface of the cavity bottom wall away from the accommodating cavity is provided with a bottom wall groove extending around the shaft, the bottom wall groove is provided with a reinforcing rib, the reinforcing rib has a first end connected with the inner peripheral wall of the bottom wall groove and a second end connected with the outer peripheral wall of the bottom wall groove, and the number of the second end is greater than the number of the first end.

[0008] According to the electronic water pump, the bottom wall groove extending around the rotating shaft is arranged at the cavity bottom wall, and the reinforcing ribs are arranged in the bottom wall groove, the number of end portions of the reinforcing ribs connected with the inner circumferential wall of the bottom wall groove is less than the number of end portions of the reinforcing ribs connected with the outer circumferential wall of the bottom wall groove, so that the structural strength of the cavity bottom wall can be improved, the degree of movement of the rotating shaft is reduced, the possibility of damage of the machine shell in the process of testing and use is reduced, and the performance of the electronic water pump is improved.

[0009] In addition, the electronic water pump according to the above-mentioned embodiments of the utility model can also have the following additional technical features:

[0010] According to some embodiments of the utility model, the reinforcing rib comprises a plurality of rib segments arranged in turn along the radial direction outwardly, in the two adjacent rib segments, the number of the rib segments located in the outer layer is greater than the number of the rib segments located in the inner layer, and the radial inner ends of at least two rib segments located in the outer layer are connected with the radial outer end of the same rib segment located in the inner layer.

[0011] According to some embodiments of the utility model, in the plurality of rib segments connected with the same inner layer rib segment, the radial inner ends are close to each other and the radial outer ends are away from each other.

[0012] According to some embodiments of the utility model, in the plurality of rib segments connected with the same inner layer rib segment, the opposite sides of the two adjacent rib segments are connected through the arc surface.

[0013] According to some embodiments of the utility model, the width of the radial inner end of the innermost layer rib segment increases towards the direction close to the inner circumferential wall.

[0014] According to some embodiments of the utility model, the rib segment comprises an equal-width segment, the width of the equal-width segment perpendicular to the extension direction is equal everywhere, and the widths of the equal-width segments of the plurality of rib segments are equal.

[0015] According to some embodiments of the utility model, the side surface of the cavity bottom wall away from the containing cavity is provided with an ejection rib, the bottom wall groove is arranged around the ejection rib, and the ejection rib extends along the circumference of the rotating shaft in a ring shape.

[0016] According to some embodiments of the utility model, the end face of the machine shell axially away from the bottom wall groove comprises a pump cavity surface extending around the containing cavity, the pump cavity surface is provided with a gate boss, the machine shell is provided with a stator assembly around the containing cavity, the stator core of the stator assembly has a stator tooth groove, and the gate boss and the stator tooth groove are opposite in the axial direction of the electronic water pump.

[0017] According to some embodiments of the present application, the pump cavity surface is provided with an end face groove, and the sprue boss is arranged on the groove bottom wall of the end face groove, wherein the height of the sprue boss protruding from the groove bottom wall is less than or equal to the depth of the end face groove.

[0018] According to some embodiments of the present application, the sprue boss is a plurality of, and the plurality of sprue bosses are arranged in the circumferential direction and correspond to the stator tooth slots one by one.

[0019] According to some embodiments of the present application, the outer circumferential surface of the shell is provided with a connecting column and a connecting flange, the connecting column and the connecting flange are used for connecting with the pump cover of the electronic water pump, the connecting flange extends along the circumference of the shell and is connected with the outer circumferential surface of the connecting column, and the side of the connecting column axially close to the cavity bottom wall is provided with a first connecting rib, and the first connecting rib connects the outer circumferential surface of the connecting column and the shell.

[0020] According to some embodiments of the present application, the side of the connecting flange axially close to the cavity bottom wall is provided with a second connecting rib, and the second connecting rib connects the outer circumferential surface of the connecting flange and the shell.

[0021] According to some embodiments of the present application, the connecting column is provided with the second connecting rib on both circumferential sides, the connecting flange includes a first part located on the side of the second connecting rib close to the connecting column and a second part located on the side of the second connecting rib away from the connecting column, and the axial thickness of the first part is greater than that of the second part.

[0022] The heat management system according to the embodiments of the present application comprises the electronic water pump according to the embodiments of the present application.

[0023] The vehicle according to the embodiments of the present application comprises the heat management system according to the embodiments of the present application.

[0024] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0026] Figure 1 is a bottom view of the electronic water pump according to the embodiments of the present application;

[0027] Figure 2 is a first partial sectional view of the shell and the rotating shaft in the electronic water pump according to the embodiments of the present application;

[0028] Figure 3 FIG. 2 is a second partial cross-sectional view of a motor case and a rotating shaft in an electronic water pump according to an embodiment of the present application;

[0029] Figure 4 FIG. 3 is a top view of a motor case in an electronic water pump according to an embodiment of the present application;

[0030] Figure 5 FIG. 4 is a side view of a motor case in an electronic water pump according to an embodiment of the present application;

[0031] Figure 6 FIG. 5 is a schematic view of a vehicle according to an embodiment of the present application.

[0032] Reference Signs:

[0033] Vehicle 1000; thermal management system 300;

[0034] Electronic water pump 200; motor case 21; accommodating cavity 211; cavity bottom wall 212; bottom wall groove 2121; inner circumferential wall 2122; outer circumferential wall 2123; welding rib 213; rotating shaft 22; reinforcing rib 23; rib section 231; equal-width section 232; ejection protruding rib 24; pump cavity surface 25; end surface groove 251; gate boss 26; connecting column 27; connecting flange 28; first connecting rib 281; second connecting rib 282; first part 283; second part 284; column 29; mounting groove 291. DETAILED DESCRIPTION

[0035] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0037] In the description of the utility model, "first feature", "second feature" can include one or more features, "multiple" means two or more, the first feature "above" or "below" the second feature can include the first and second features directly contact, can also include the first and second features are not directly contact but contact through another feature between them, the first feature "above", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height.

[0038] In the related art, in order to reduce the degree of movement of the rotating shaft and meet the blasting test requirements, some reinforcing ribs are usually added at the part of the shell corresponding to one end of the rotating shaft. However, the structure of the reinforcing rib in the related art is not reasonable, the anti-deformation ability is limited, the effect of preventing the rotating shaft from moving is poor, and the increasingly stringent blasting test requirements cannot be met.

[0039] And the electronic water pump 200 provided in the application improves the anti-deformation ability of the position where the shell 21 is connected with the rotating shaft 22, has good effect of preventing the rotating shaft 22 from moving, has high structural strength, and can meet the increasingly stringent blasting test requirements.

[0040] Next, with reference to the drawings, the electronic water pump 200 according to the embodiments of the utility model is described.

[0041] Referring to Figures 1-6 According to the electronic water pump 200 of the embodiments of the utility model, the shell 21 can include: a shell 21 and a rotating shaft 22, the shell 21 is an injection molded body and has a containing cavity 211; the rotating shaft 22 is located in the containing cavity 211, and the end of the rotating shaft 22 is connected with the cavity bottom wall 212 of the axial end of the containing cavity 211, and the side surface of the cavity bottom wall 212 away from the containing cavity 211 is provided with a bottom wall groove 2121 extending around the rotating shaft 22.

[0042] For example, referring to Figure 2 And Figure 3 The electronic water pump 200 is provided with a shell 21, the shell 21 is provided as an injection molded body, the shell 21 is configured as a cylinder and forms an open containing cavity 211, a pump cover is installed on the shell 21, and the pump cover is located at the open end of the containing cavity 211 to close the containing cavity 211.

[0043] Referring again to Figure 2 And Figure 3, the electronic water pump 200 is further provided with a rotating shaft 22, the rotating shaft 22 is installed in the accommodating cavity 211, and the rotating shaft 22 is suitable for being arranged in the axial direction of the shell 21. The rotating shaft 22 is injection molded with the shell 21 to fix one end of the rotating shaft 22 to the cavity bottom wall 212 at one end of the accommodating cavity 211 in the axial direction, so that the rotating shaft 22 can be stably installed in the accommodating cavity 211. The rotor assembly is rotatably fixed to the rotating shaft 22 through the shaft sleeve, so that the rotating shaft 22 can support the rotor assembly to enable the electronic water pump 200 to work stably.

[0044] For example, in some embodiments, as shown in Figures 1-3 The cavity bottom wall 212 of the accommodating cavity 211 is provided with a column 29 at the center position of the cavity bottom wall 212 and is configured to be protrudingly arranged away from the accommodating cavity 211. The column 29 is defined with a mounting groove 291 on the side of the column 29 facing the accommodating cavity 211, and the mounting groove 291 is in communication with the accommodating cavity 211.

[0045] The cavity bottom wall 212 of the accommodating cavity 211 is provided with a column 29 at the center position of the cavity bottom wall 212 and is configured to be protrudingly arranged away from the accommodating cavity 211. The column 29 is defined with a mounting groove 291 on the side of the column 29 facing the accommodating cavity 211, and the mounting groove 291 is in communication with the accommodating cavity 211.

[0046] Therefore, by providing the bottom wall groove 2121 on the cavity bottom wall 212, the wall thickness of the cavity bottom wall 212 at the bottom wall groove 2121 can be reduced, so that the gap at the bottom wall groove 2121 is small during pouring, the resistance to the flow of the material during injection molding is increased, the material is preferentially filled at the cavity bottom wall 212, and the filling of the material at the cavity bottom wall 212 can be avoided. The formation of a weld mark at the cavity bottom wall 212 can be avoided, and the strength of the shell 21 and the performance of the electronic water pump 200 can be improved.

[0047] In addition, the bottom wall groove 2121 is provided with a reinforcing rib 23. The reinforcing rib 23 has a first end connected to the inner circumferential wall 2122 of the bottom wall groove 2121 and a second end connected to the outer circumferential wall 2123 of the bottom wall groove 2121. Here, the inner circumferential wall 2122 of the bottom wall groove 2121 is the circumferential wall of the bottom wall groove 2121 close to the rotating shaft 22, and the outer circumferential wall 2123 of the bottom wall groove 2121 is the circumferential wall of the bottom wall groove 2121 away from the rotating shaft 22. The number of second ends is greater than the number of first ends. For example, as shown in Figure 1 The number of first ends can be one, and the number of second ends can be two; or the number of first ends can be one, and the number of second ends can be three or four, etc.; or the number of first ends can be two, and the number of second ends can be three, four, five, etc. For example, the reinforcing rib 23 can be provided with a plurality of reinforcing ribs 23 spaced apart in the circumferential direction of the rotating shaft 22.

[0048] It can be understood that by making the number of the second ends of the reinforcing ribs 23 greater than the number of the first ends, on the one hand, compared with the strip-shaped reinforcing ribs, the structural strength of the reinforcing ribs 23 in the utility model is greatly increased, and the anti-deformation ability is enhanced; on the other hand, the area of the outer circumferential wall 2123 of the bottom wall groove 2121 is greater than the area of the inner circumferential wall 2122 of the bottom wall groove 2121, the number of the second ends of the reinforcing ribs 23 is greater than the number of the first ends, that is, the connecting area of the reinforcing ribs 23 and the outer circumferential wall 2123 of the bottom wall groove 2121 is greater than the connecting area of the reinforcing ribs 23 and the inner circumferential wall 2122 of the bottom wall groove 2121, thereby the reinforcing ribs 23 can better and more uniformly transmit the axial force and the radial force received by the rotating shaft 22 to the outer circumferential wall 2123 of the bottom wall groove 2121, so that the supporting effect on the rotating shaft 22 is better, and the degree of movement of the rotating shaft 22 is reduced; in addition, the connecting area of the reinforcing ribs 23 and the groove bottom wall of the accommodating cavity 211 close to the bottom wall groove 2121 is also greater, and the reinforcing effect on the groove bottom wall of the accommodating cavity 211 close to the bottom wall groove 2121 is also better, so that the structural strength at the cavity bottom wall 212 is better, and the pressure resistance is not easy to be damaged.

[0049] According to the electronic water pump 200 in the embodiment of the utility model, the bottom wall groove 2121 extending around the rotating shaft 22 is arranged at the cavity bottom wall 212, and the reinforcing ribs 23 are arranged in the bottom wall groove 2121, the number of the end portions of the reinforcing ribs 23 connected with the inner circumferential wall 2122 of the bottom wall groove 2121 is less than the number of the end portions connected with the outer circumferential wall 2123 of the bottom wall groove 2121, so that the structural strength at the cavity bottom wall 212 can be improved, the degree of movement of the rotating shaft 22 is reduced, the possibility of damage of the machine shell 21 in the testing and use process is reduced, and the performance of the electronic water pump 200 is improved.

[0050] In some specific embodiments, the reinforcing ribs 23 are integrally injection molded with the machine shell 21, the reinforcing ribs 23 have good force transmission effect, and subsequent processing of the machine shell 21 after the machine shell 21 is formed is not required, so that the processing procedures and costs are reduced.

[0051] In some embodiments, the reinforcing ribs 23 include a plurality of layers of rib segments 231 arranged in the radial direction outward in sequence, in the adjacent two layers of rib segments 231, the number of the rib segments 231 located in the outer layer is greater than the number of the rib segments 231 located in the inner layer, and the radial inner end of at least two rib segments 231 located in the outer layer is connected with the radial outer end of the same rib segment 231 located in the inner layer. Figure 1 As shown in FIG. 5, the rib segments 231 can be provided in two layers, in the radial direction outward, the two layers of rib segments 231 are respectively denoted as a first layer of rib segments and a second layer of rib segments, the number of the first layer of rib segments can be one, and the number of the second layer of rib segments can be two, three, four or the like, and the plurality of second layer of rib segments are all connected with the radial outer end of the first layer of rib segments.

[0052] For example, the three layers of the reinforcing rib 231 can be arranged in a radial outward direction, and the three layers of the reinforcing rib 231 are respectively referred to as a first layer of reinforcing rib, a second layer of reinforcing rib, and a third layer of reinforcing rib. The number of the first layer of reinforcing rib can be one, the number of the second layer of reinforcing rib can be two, and the number of the third layer of reinforcing rib can be three or four. The radial inner ends of the two second layer of reinforcing ribs are connected to the radial outer end of the first layer of reinforcing rib. When the number of the third layer of reinforcing rib is three, the radial inner ends of two third layer of reinforcing ribs are connected to the radial outer end of one of the second layer of reinforcing ribs, and the radial inner end of the other third layer of reinforcing rib is connected to the radial outer end of the other second layer of reinforcing rib. When the number of the third layer of reinforcing rib is four, the radial inner ends of two third layer of reinforcing ribs are connected to the radial outer end of one of the second layer of reinforcing ribs, and the radial inner ends of the other two third layer of reinforcing ribs are connected to the radial outer end of the other second layer of reinforcing rib. It can be understood that the reinforcing rib 231 can also be arranged in four layers, five layers, six layers, and the like. The number of the reinforcing rib 231 in the outer layer connected to the radial outer end of the reinforcing rib 231 in the inner layer can be two, three, four, and the like. The number of the reinforcing rib 231 connected to the inner circumferential wall 2122 can be one, two, three, and the like. The present application does not limit this.

[0053] The shape of the reinforcing rib 231 can be a long strip shape, an arc shape, an L shape, and the like. The shape of the reinforcing rib 231 in the inner layer can be the same as or different from the shape of the reinforcing rib 231 in the outer layer. The present application does not limit this.

[0054] In this way, the connecting area of the reinforcing rib 23 and the groove 2121 of the bottom wall is increased, the supporting effect of the reinforcing rib 23 on the rotating shaft 22 is better, which is conducive to reducing the degree of movement of the rotating shaft 22 and improving the structural strength of the cavity bottom wall 212.

[0055] In some embodiments, referring to Figure 1 In other words, the distance between the radial inner ends of the plurality of reinforcing ribs 231 connected to the same inner layer reinforcing rib 231 is greater than the distance between the radial outer ends of the plurality of reinforcing ribs 231 connected to the same inner layer reinforcing rib 231. In this way, adjacent reinforcing ribs 231 of the plurality of reinforcing ribs 231 connected to the same inner layer reinforcing rib 231 can form a triangular structure, thereby making the structure of the reinforcing rib 23 and the structure of the cavity bottom wall 212 more stable, and the anti-deformation ability is enhanced. In the blasting test, it is not easy to be damaged.

[0056] In some embodiments, referring to Figure 1As shown, among the plurality of rib segments 231 connected to the same inner layer rib segment 231, the opposite side surfaces of two adjacent rib segments 231 are connected through a circular arc surface. In this way, the wall thickness at the position where the plurality of rib segments 231 are connected to the same inner layer rib segment 231 is thicker, the structural strength is higher, and the rib segment 231 is less likely to break. The design of the circular arc surface can also reduce stress concentration and optimize flow, provide lower stress concentration and smaller flow resistance, and facilitate the improvement of the structural strength of the reinforcing rib 23.

[0057] In some embodiments, referring to Figure 1 As shown, the side wall surface of the rib segment 231 in the inner layer and the rib segment 231 in the outer layer are connected through a circular arc surface to provide lower stress concentration and smaller flow resistance, and facilitate the improvement of the structural strength of the reinforcing rib 23.

[0058] In some embodiments, referring to Figure 1 As shown, the width of the radially inner end of the innermost layer rib segment 231 increases towards the inner circumferential wall 2122. It should be noted that the width of the rib segment 231 refers to the dimension of the rib segment 231 in the axial direction perpendicular to the shaft 22 and perpendicular to the extension direction of the rib segment 231. The width of the radially inner end of the innermost layer rib segment 231 increases towards the inner circumferential wall 2122, so that the connection area of the innermost layer rib segment 231 and the inner circumferential wall 2122 is larger, the connection strength is better, and it is beneficial to better support the shaft 22 and make the force transmission more uniform.

[0059] In some embodiments, referring to Figure 1 As shown, the rib segment 231 includes an equal-width segment 232, the width of the equal-width segment 232 is equal everywhere perpendicular to the extension direction, and the widths of the equal-width segments 232 of the plurality of rib segments 231 are equal. In this way, the dimensions of the reinforcing rib 23 at different positions are more uniform, which is beneficial to reduce the shrinkage difference at different positions of the reinforcing rib 23, improve the surface size accuracy of the fluid surface, and further improve the performance of the electronic water pump 200. For example, referring to Figure 1 As shown, the equal-width segment 232 is between the radially inner end of the rib segment 231 and the radially outer end of the rib segment 231.

[0060] According to some embodiments of the present application, referring to Figure 2 and Figure 3 As shown, the side surface of the cavity bottom wall 212 away from the accommodating cavity 211 is provided with an ejection protruding rib 24, and the bottom wall groove 2121 is arranged around the ejection protruding rib 24, and the ejection protruding rib 24 extends in a ring shape along the circumference of the shaft 22. It should be noted that when the shell 21 is molded and demolded, the ejector pin will eject the molded shell 21 to separate the shell 21 from the shell mold. In the related art, burrs will be formed around the position where the shell and the ejector pin abut, affecting the appearance of the shell.

[0061] In the embodiment of the utility model, the ejection convex rib 24 is arranged on the side surface of the cavity bottom wall 212 away from the accommodating cavity 211, the area surrounded by the ejection convex rib 24 defines an ejection surface, the ejection surface is used for abutting against the ejector pin, the burr formed when the ejector pin ejects the casing 21 is directly formed at the connection between the inner circumferential surface of the ejection convex rib 24 and the ejection surface, and the existence of the burr is not easy to be perceived on the appearance, or the burr is not easy to be formed on the appearance (the burr is formed inside the ejection convex rib 24), thus, the appearance of the casing 21 is more beautiful.

[0062] According to some embodiments of the utility model, as shown in the figure, Figure 3 As shown in the figure, the one end surface of the casing 21 axially away from the bottom wall groove 2121 includes a pump cavity surface 25 extending around the accommodating cavity 211. Specifically, the one end of the casing 21 axially away from the bottom wall groove 2121 is used for covering the pump cover, the pump cover cooperates with the casing 21 to define the pump cavity, the impeller structure is located in the pump cavity, and the impeller structure can rotate under the driving of the rotor assembly, the rotor assembly is installed on the rotating shaft 22, under the driving of the rotor assembly, the impeller structure can rotate to drive the fluid in the pump cavity to flow, so as to realize the liquid pumping of the electronic water pump 200, and the pump cavity surface 25 refers to the one end surface of the casing 21 towards the impeller structure.

[0063] The casing 21 is provided with a stator assembly around the accommodating cavity 211, and the stator core of the stator assembly has a stator tooth slot. Specifically, the casing 21 injection-molds the stator assembly, the stator assembly can include a stator core, an insulating support and a stator winding, the insulating support is installed on the stator core, and the stator winding is installed on the insulating support. The insulating support can realize the insulation between the stator core and the stator winding, and stably install the stator winding on the stator core, such as stably winding on the stator teeth of the stator core, the stator core has a plurality of stator teeth, and the stator tooth slots are defined between adjacent stator teeth.

[0064] The pump cavity surface 25 is provided with a gate boss 26, and the gate boss 26 is opposite to the stator tooth groove in the axial direction of the electronic water pump 200. It should be noted that the gate is an opening structure on the shell mold for injecting the casting material into the shell mold, and after the shell 21 is cast, the shell 21 is separated from the shell mold, and the shell 21 will form a gate boss 26 at the position corresponding to the gate. The gate boss 26 is opposite to the stator tooth groove in the axial direction of the electronic water pump 200, in other words, the gate is opposite to the stator tooth groove in the axial direction of the electronic water pump 200, so that the casting material can be quickly or directly injected into the stator tooth groove to uniformly fill the stator tooth groove, which is beneficial to the rapid flow of the material; and the casting material entering the shell mold has a smaller impact on the stator winding, which can reduce the influence of the material on the stator winding. In addition, after the casting material enters the mold from the gate boss 26, it flows in the axial direction and close to the reinforcing rib 23. Since the reinforcing rib 23 in the utility model is larger in cross-sectional area perpendicular to the axial direction of the electronic water pump 200, the flow cross-sectional area of the casting material is larger, the resistance is smaller, and the flow of the casting material and the collection of the casting material in the cavity bottom wall 212 are more beneficial.

[0065] In some specific embodiments, in the circumferential direction of the stator assembly, a communication space is defined between adjacent stator windings, and the gate boss 26 is opposite to the communication space in the axial direction of the electronic water pump 200, so that the casting material can be directly injected into the communication space to minimize the influence of the material on the stator winding and facilitate the rapid flow of the material.

[0066] According to some embodiments of the utility model, as shown in Figure 3 The pump cavity surface 25 is provided with an end face groove 251, and the gate boss 26 is arranged on the groove bottom wall of the end face groove 251. The height of the gate boss 26 protruding from the groove bottom wall is less than or equal to the depth of the end face groove 251. In the related art, the gate boss is directly formed on the pump cavity surface and protrudes from the pump cavity surface. Cracks are easily formed around the gate boss, and water and other fluid media may seep into the shell from the cracks, resulting in poor use effect and short service life of the electronic water pump 200. In addition, when trimming the gate boss later, repeated trimming is required to make the gate boss as flat as possible with the pump cavity surface, so as to reduce the possibility of interference between the gate boss and other components such as the rotor assembly on one side of the pump cavity surface, which is time-consuming and laborious.

[0067] In the present application, by setting the end face groove 251 at the pump cavity surface 25, and setting the gate boss 26 at the groove bottom wall of the end face groove 251, when trimming the gate operation, the gate boss 26 is directly trimmed to a height less than or equal to the depth of the end face groove 251, or the gate boss 26 does not need to be trimmed, thereby reducing the processing difficulty of the machine shell 31 and improving the production efficiency of the machine shell 31. In addition, compared with the gate boss directly formed on the pump cavity surface in the related art, the gate boss 26 in the present application is formed on the groove bottom wall of the end face groove 251, and the possibility of forming cracks at the gate boss 26 is also greatly reduced.

[0068] According to some embodiments of the present application, as shown in Figure 4 , the gate boss 26 is a plurality of gate bosses 26, and the plurality of gate bosses 26 are spaced apart along the circumferential direction and are arranged one-to-one corresponding to the stator tooth grooves. That is, the number of gate bosses 26 is equal to the number of stator tooth grooves. Therefore, the casting material can be more quickly and uniformly filled in the machine shell mold, the filling uniformity is better, and the generation of weld marks is reduced.

[0069] In some embodiments, the number of gate bosses 26 can also be less than the number of stator tooth grooves, that is, the plurality of gate bosses 26 can be arranged one-to-one corresponding to part of the stator tooth grooves.

[0070] In some embodiments of the present application, as shown in Figure 2 , Figure 3 and Figure 5 , the outer circumferential surface of the machine shell 21 is provided with a connecting column 27 and a connecting flange 28, and the connecting column 27 and the connecting flange 28 are used to connect with the pump cover of the electronic water pump 200. For example, the connecting column 27 can be a bolt column, and the connecting column 27 is connected with the pump cover through the bolt penetrating the pump cover and the connecting column 27, and the wall surface of the connecting flange 28 facing the pump cover is connected with the axial end surface of the pump cover through the welding rib 213 (as shown in Figure 4 ), for example, the welding rib 213 can be heated by ultrasonic wave, hot gas, hot die or infrared, etc. to at least partially melt and deform. Among them, the heating efficiency of the infrared heating mode is high, and it is easy to accurately control the heating position and control the hot melting state of the welding rib 213, so as to ensure the welding effect, and at the same time avoid affecting the structure of other parts of the machine shell 21. During the process of pressing the pump cover to the axial side of the machine shell 21, the hot melting welding rib 213 can be opposite to and in contact with the hot melting convex rib structure on the pump cover, and can be extruded with each other as the pump cover and the machine shell 21 move, so that the hot melting parts of the two welding ribs are mixed with each other and gradually cooled, and the hot melting parts are solidified to form a welding section after cooling, thereby completing the welding. During the whole welding process, no additional welding material is needed, and no additional welding tooling is needed during the process of pressing the pump cover to the machine shell 21, which avoids interference with the assembly of the pump cover and the machine shell 21, and at the same time ensures the reliability of the connection.

[0071] In some embodiments, at least one side of the welding ribs 213 is provided with a flash groove. During the mutual extrusion of the hot-melt welding ribs 213, part of the hot-melt material can flow into the flash groove and be stored in the flash groove, so as to avoid the material flowing out of the electronic water pump 100 to affect the appearance of the electronic water pump 100, and also avoid the material flowing into the interior of the electronic water pump 100 to damage the internal components.

[0072] It should be noted that after the welding is completed, the flash groove can be completely filled with material or partially filled with material. In some specific embodiments, the flash groove is partially filled (for example, the filling rate is less than or equal to 80%), that is, the volume of the flash groove is large enough to completely accommodate the material flowing out of the welding ribs, effectively avoiding material overflow.

[0073] In some embodiments, referring to Figure 2 , Figure 3 and Figure 5 , the connecting flange 28 extends along the circumference of the casing 21 and is connected to the outer circumferential surface of the connecting column 27, so that the connecting flange 28 can also play a role in strengthening the connection strength between the connecting column 27 and the casing 21.

[0074] In some embodiments, referring to Figure 2 , Figure 3 and Figure 5 , the connecting column 27 is provided with a first connecting rib 281 on the side close to the cavity bottom wall 212 in the axial direction, and the first connecting rib 281 connects the outer circumferential surface of the connecting column 27 and the casing 21. For example, the first connecting rib 281 can be provided with one or more, one end of the first connecting rib 281 in the radial direction is connected to the outer circumferential surface of the casing 21, the other end of the first connecting rib 281 in the radial direction is connected to the outer circumferential surface of the connecting column 27, and the size of one end of the first connecting rib 281 in the axial direction can be greater than the size of the other end of the first connecting rib 281 in the axial direction.

[0075] By providing the first connecting rib 281, the first connecting rib 281 can support the connecting column 27, reduce the deformation amount of the connecting column 27 during the injection molding process, and also improve the connection stability of the pump cover and the casing 21. Under the vibration working condition of the electronic water pump 200, the first connecting rib 281 can also reduce the possibility of excessive deformation and fracture of the connecting column 27.

[0076] In some embodiments of the utility model, referring to Figure 2 , Figure 3 and Figure 5As shown, the side of the connecting flange 28 axially close to the cavity bottom wall 212 is provided with a second connecting rib 282 connecting the connecting flange 28 and the outer circumferential surface of the casing 21. For example, the second connecting rib 282 can be arranged in plurality along the outer circumferential surface of the casing 21, thereby to increase the supporting strength of the connecting flange 28, reduce the possibility of the connecting flange 28 being deformed greatly, and facilitate to increase the connecting stability of the casing 21 and the pump cover.

[0077] In some embodiments of the present application, as shown in Figure 2 , Figure 3 and Figure 5 , the connecting column 27 is provided with a second connecting rib 282 on each of the circumferential sides, the connecting flange 28 comprises a first part 283 located on the side of the second connecting rib 282 close to the connecting column 27 and a second part 284 located on the side of the second connecting rib 282 away from the connecting column 27, and the axial thickness of the first part 283 is greater than the axial thickness of the second part 284. In other words, the axial thickness of the first part 283 is greater, so that the connecting flange 28 has a better reinforcing effect on the connecting column 27, and the possibility of the connecting column 27 being shaken or damaged can be reduced; the axial thickness of the second part 284 is smaller, so that the material and weight can be reduced, which is conducive to the light weight of the electronic water pump 200.

[0078] For example, as shown in Figures 1-5 , the connecting column 27 can be provided with two, and correspondingly, the second connecting rib 282 is provided with at least four, the first part 283 refers to the part between the connecting column 27 and the adjacent second connecting rib 282, and the second part 284 refers to the part between the adjacent two second connecting ribs 282. However, the connecting column 27 can also be provided with three, four or the like, and correspondingly, the second connecting rib 282 is provided with at least six, eight or the like.

[0079] The electronic water pump 200 according to one specific embodiment of the present application will be described in detail below with reference to the accompanying drawings, and it should be understood that the following description is only exemplary and cannot be understood as a limitation of the application.

[0080] As shown in Figure 6 , the electronic water pump 200 according to some embodiments of the present application comprises a casing 21 and a rotating shaft 22, the casing 21 is an injection molded body and has a containing cavity 211; a pump cover covers the cavity opening of the containing cavity 211, and the pump cover defines a pump cavity, an impeller is injection molded with a rotor assembly and located in the pump cavity for driving the fluid in the pump cavity to flow. The rotating shaft 22 is located in the containing cavity 211 and the end of the rotating shaft 22 is connected to the cavity bottom wall 212 at one axial end of the containing cavity 211, and the surface of the cavity bottom wall 212 away from the containing cavity 211 is provided with a bottom wall groove 2121 extending around the rotating shaft 22.

[0081] The reinforcing rib 23 is arranged in the bottom wall groove 2121, has a first end connected with the inner circumferential wall 2122 of the bottom wall groove 2121 and a second end connected with the outer circumferential wall 2123 of the bottom wall groove 2121, and comprises two layers of rib segments 231 arranged in turn outward in the radial direction, wherein the number of the rib segments 231 in the outer layer is two, the number of the rib segments 231 in the inner layer is one, and the radial inner ends of the two rib segments 231 in the outer layer are connected with the radial outer end of the rib segment 231 in the inner layer. The radial inner ends of the two rib segments 231 in the outer layer are close to each other and the radial outer ends of the two rib segments 231 in the outer layer are far away from each other, and the opposite sides of the two rib segments 231 in the outer layer are connected through a circular arc surface. The width of the radial inner end of the rib segment 231 in the inner layer increases towards the inner circumferential wall 2122. The rib segment 231 comprises an equal-width segment 232, the width of the equal-width segment 232 is equal everywhere perpendicular to the extending direction, and the widths of the equal-width segments 232 of the two layers of rib segments 231 are equal. In this way, the area connected with the outer circumferential wall 2123 of the bottom wall groove 2121 of the reinforcing rib 23 is doubled, the ability of the reinforcing rib 23 to support the rotating shaft 22 against the axial force and the radial force is greatly enhanced, and the reinforcing rib 23 in the utility model is less likely to be broken under high blasting pressure.

[0082] The side surface of the cavity bottom wall 212 opposite to the accommodating cavity 211 is provided with an ejection protruding rib 24, the bottom wall groove 2121 is arranged around the ejection protruding rib 24, and the ejection protruding rib 24 extends in a ring shape along the circumference of the rotating shaft 22. The ejection protruding rib 24 defines the position of the ejector pin for ejecting the machine shell 21 after injection molding is completed, and the trace formed by the ejector pin abutting against the machine shell 21 is formed on the ejection protruding rib 24, so that the appearance is not easy to be found, the influence on the appearance of the entire electronic water pump 200 is reduced, and the appearance is more beautiful.

[0083] The end surface of the machine shell 21 axially opposite to the bottom wall groove 2121 comprises a pump cavity surface 25 extending around the accommodating cavity 211, the pump cavity surface 25 is provided with gate bosses 26, the machine shell 21 is internally provided with a stator assembly around the accommodating cavity 211, the stator core of the stator assembly has stator tooth slots, the gate bosses 26 are opposite to the stator tooth slots in the axial direction of the electronic water pump 200, the gate bosses 26 are a plurality of, and the plurality of gate bosses 26 are arranged in the circumferential direction and correspond to the stator tooth slots one by one, so that the flow of the casting material is facilitated. The casting material flows in the axial direction and in the direction close to the reinforcing rib 23, and when the casting material flows to the reinforcing rib 23, because the cross-sectional area of the reinforcing rib 23 in the axial direction of the electronic water pump 200 is increased, the cross-sectional area of the flow of the casting material is increased, the resistance is smaller, and the flow of the casting material and the gathering of the casting material in the cavity bottom wall 212 are more facilitated.

[0084] The pump cavity surface 25 is provided with an end surface groove 251, and the gate boss 26 is arranged on the groove bottom wall of the end surface groove 251, wherein the height of the gate boss 26 protruding from the groove bottom wall is less than or equal to the depth of the end surface groove 251. The end surface of the gate boss 26 away from the end surface groove 251 is a glue inlet surface, and the height of the gate boss 26 protruding from the groove bottom wall is less than or equal to the depth of the end surface groove 251, so that the gate boss 26 will not protrude and interfere with the parts (such as impeller structure) on one side of the pump cavity surface 25.

[0085] The outer circumferential surface of the casing 21 is provided with a connecting column 27 and a connecting flange 28, the connecting column 27 and the connecting flange 28 are used for connecting with the pump cover of the electronic water pump 200, the connecting flange 28 extends along the circumference of the casing 21 and is connected with the outer circumferential surface of the connecting column 27, and the connecting column 27 is provided with a first connecting rib 281 on the side axially close to the cavity bottom wall 212, the first connecting rib 281 connects the outer circumferential surface of the connecting column 27 and the casing 21, and the first connecting rib 281 can reduce the deformation amount of the connecting column 27 during injection molding and can provide stronger support for the connecting column 27 under vibration working conditions.

[0086] The side axially close to the cavity bottom wall 212 of the connecting flange 28 is provided with a second connecting rib 282, the second connecting rib 282 connects the connecting flange 28 and the outer circumferential surface of the casing 21. The connecting column 27 is provided with the second connecting rib 282 on both sides in the circumferential direction, the connecting flange 28 includes a first part 283 located on the side close to the connecting column 27 of the second connecting rib 282 and a second part 284 located on the side away from the connecting column 27 of the second connecting rib 282, and the axial thickness of the first part 283 is greater than that of the second part 284. In other words, the connecting flange 28 is not subjected to glue reduction treatment on the part corresponding to the connecting column 27 and the adjacent second connecting rib 282, so as to improve the connection strength of the connecting column 27 and the casing 21, and the connecting flange 28 is subjected to glue reduction treatment on the part between the adjacent second connecting ribs 23, so that the material used is less, and the electronic water pump 200 product is lighter.

[0087] As shown in Figure 6 The heat management system 300 according to the embodiment of the utility model comprises the electronic water pump 200 according to the embodiment of the utility model. Since the electronic water pump 200 according to the embodiment of the utility model has the beneficial technical effects described above, the heat management system 300 according to the embodiment of the utility model can improve the structural strength at the cavity bottom wall 212, reduce the degree of movement of the rotating shaft 22, reduce the possibility of damage of the casing 21 during testing and use, and improve the performance of the electronic water pump 200 by arranging the bottom wall groove 2121 extending around the rotating shaft 22 at the cavity bottom wall 212 and arranging the reinforcing rib 23 in the bottom wall groove 2121, and the number of end portions of the reinforcing rib 23 connected with the inner circumferential wall 2122 of the bottom wall groove 2121 is less than that of end portions connected with the outer circumferential wall 2123 of the bottom wall groove 2121.

[0088] In some embodiments, the thermal management system 300 is an important component for adjusting the environment (temperature, humidity, etc.) of the automobile cabin and the working environment of other components, wherein the thermal management system 300 mainly includes valves, heat exchangers, compressors and pumps such as the electronic water pump 200 or other water pumps, and the thermal management system 300 has a circulating flow of refrigerant, which can be liquid antifreeze or carbon dioxide refrigerant, etc.

[0089] As ​ shown, the vehicle 1000 according to the embodiment of the utility model comprises the thermal management system 300 according to the embodiment of the utility model. Since the thermal management system 300 according to the embodiment of the utility model has the beneficial technical effects described above, the vehicle 1000 according to the embodiment of the utility model, by setting the bottom wall groove 2121 extending around the rotating shaft 22 at the cavity bottom wall 212, and setting the reinforcing rib 23 in the bottom wall groove 2121, the number of the end portion of the reinforcing rib 23 connected with the inner circumferential wall 2122 of the bottom wall groove 2121 is less than the number of the end portion connected with the outer circumferential wall 2123 of the bottom wall groove 2121, so that the structural strength at the cavity bottom wall 212 can be improved, the degree of movement of the rotating shaft 22 is reduced, the possibility of damage of the casing 21 during testing and use is reduced, and the performance of the electronic water pump 200 is improved.

[0090] Among them, the vehicle 1000 can be a new energy vehicle, in some embodiments, the new energy vehicle can be a pure electric vehicle using an electric motor as the main driving force, in other embodiments, the new energy vehicle can also be a hybrid vehicle using an internal combustion engine and an electric motor as the main driving force. Regarding the internal combustion engine and the electric motor mentioned in the above embodiments for providing driving force for the new energy vehicle, the internal combustion engine can use gasoline, diesel, hydrogen, etc. as fuel, and the electric motor can use power batteries, hydrogen fuel cells, etc. to provide electric energy, which is not specially limited here. It should be noted that this is only an exemplary description of the structure of the new energy vehicle, and is not intended to limit the scope of protection of the utility model.

[0091] The other configurations and operations of the thermal management system 300 and the vehicle 1000 according to the embodiment of the utility model are known to those skilled in the art, and will not be described in detail here.

[0092] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, the term "installation", "link", "connection" should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can pass through the indirect connection of intermediate medium, can be two elements inside the communication.For the ordinary skilled person in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0093] In the description of the present specification, the description of the terms "embodiment", "specific embodiment", "example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0094] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. An electronic water pump, characterized in that, include: A housing, wherein the housing is an injection-molded body and has a receiving cavity; A rotating shaft is located within the receiving cavity, and the end of the rotating shaft is connected to the bottom wall of one axial end of the receiving cavity. The bottom wall of the cavity has a bottom wall groove extending around the rotating shaft on the side surface facing away from the receiving cavity. A reinforcing rib is provided in the bottom wall groove. The reinforcing rib has a first end connected to the inner peripheral wall of the bottom wall groove and a second end connected to the outer peripheral wall of the bottom wall groove, wherein the number of the second ends is greater than the number of the first ends.

2. The electronic water pump according to claim 1, characterized in that, The reinforcing ribs include multiple layers of rib segments arranged radially outward. In two adjacent layers of rib segments, the number of rib segments in the outer layer is greater than the number of rib segments in the inner layer, and the radial inner ends of at least two rib segments in the outer layer are connected to the radial outer ends of the same rib segment in the inner layer.

3. The electronic water pump according to claim 2, characterized in that, Among the multiple rib segments connected to the same inner layer rib segment, the radially inner ends are close to each other and the radially outer ends are far apart from each other.

4. The electronic water pump according to claim 2, characterized in that, Among the multiple rib segments connected to the same inner layer rib segment, the opposing sides of two adjacent rib segments are connected by a circular arc surface.

5. The electronic water pump according to claim 2, characterized in that, The width of the radial inner end of the innermost rib segment increases toward the inner peripheral wall.

6. The electronic water pump according to claim 2, characterized in that, The rib segment includes a uniform width segment, the width of which is equal everywhere perpendicular to the extension direction, and the uniform width segments of multiple rib segments have equal widths.

7. The electronic water pump according to claim 1, characterized in that, The bottom wall of the cavity is provided with an ejector rib on the side facing away from the receiving cavity. The bottom wall groove is arranged around the ejector rib, and the ejector rib extends in a ring shape along the circumference of the rotating shaft.

8. The electronic water pump according to claim 1, characterized in that, The end face of the housing facing away from the bottom wall groove in the axial direction includes a pump cavity surface extending around the receiving cavity. The pump cavity surface is provided with a gate boss. The housing is provided with a stator assembly surrounding the receiving cavity. The stator core of the stator assembly has stator teeth. The gate boss and the stator teeth are opposite to each other along the axial direction of the electronic water pump.

9. The electronic water pump according to claim 8, characterized in that, The pump cavity surface is provided with an end face groove, and the gate boss is provided on the bottom wall of the end face groove, wherein the height of the gate boss protruding from the bottom wall of the groove is less than or equal to the depth of the end face groove.

10. The electronic water pump according to claim 8, characterized in that, There are multiple gate bosses, which are spaced apart along the circumferential direction and correspond one-to-one with the stator tooth grooves.

11. The electronic water pump according to claim 1, characterized in that, The outer peripheral surface of the housing is provided with a connecting post and a connecting flange. The connecting post and the connecting flange are used to connect with the pump cover of the electronic water pump. The connecting flange extends circumferentially along the housing and connects with the outer peripheral surface of the connecting post. The connecting post is provided with a first connecting rib on the side axially close to the bottom wall of the cavity. The first connecting rib connects the connecting post and the outer peripheral surface of the housing.

12. The electronic water pump according to claim 11, characterized in that, The connecting flange is provided with a second connecting rib on the side axially close to the bottom wall of the cavity, and the second connecting rib connects the connecting flange and the outer peripheral surface of the housing.

13. The electronic water pump according to claim 12, characterized in that, The connecting column is provided with the second connecting ribs on both sides of its circumference. The connecting flange includes a first part located on the side of the second connecting rib closer to the connecting column and a second part located on the side of the second connecting rib away from the connecting column. The axial thickness of the first part is greater than the axial thickness of the second part.

14. A thermal management system, characterized in that, Including the electronic water pump according to any one of claims 1-13.

15. A vehicle, characterized in that, Includes the thermal management system according to claim 14.

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