Fluid pump

Abstract

A fluid pump, comprising a pump housing (10), an impeller (20) arranged in the pump housing (10), and an electric motor (30) for driving the impeller (20) to rotate in the pump housing (10). The electric motor (30) comprises a stator (32) and a rotor (34), wherein the rotor (34) is fixedly connected to the impeller (20) by means of a rotating shaft (40); a sleeve (50) is provided in the pump housing (10), the sleeve (50) divides an internal space of the pump housing (10) into a first space (16) and a second space (18), the rotor (34), the rotating shaft (40) and the impeller (20) are movably arranged in the first space (16), and the stator (32) is fixedly arranged in the second space (18); and a first bearing assembly (42) and a second bearing assembly (44) are respectively provided at two ends of the rotating shaft (40), and the first bearing assembly (42) is connected to the end of the sleeve (50) close to the impeller (20), such that two ends of the rotating shaft (40) can be effectively supported to avoid deflection, thereby improving the stability and safety of the fluid pump during operation.

Description

Fluid pump TECHNICAL FIELD

[0001] The present application relates to the technical field of pumps, in particular to a fluid pump. BACKGROUND

[0002] Pumps are usually connected in series in a pipeline for the delivery of fluids, such as water, coolant, fuel gas, etc., such as in the thermal management system of an electric vehicle charger, for the delivery of coolant to cool the battery or cable, etc.

[0003] In the existing structure, the pump generally comprises a pump shell, an impeller arranged in the pump shell, and a motor for driving the impeller to rotate in the pump shell. The motor comprises a stator and a rotor rotatable relative to the stator. The rotor is connected to the impeller to drive the impeller to rotate. In order to avoid the influence of fluid on the electrical safety of the motor, the stator and the rotor are separated by a sleeve. The stator is sleeved on the outside of the sleeve. The inside of the sleeve is fixed with a shaft. The rotor and the impeller are rotatably sleeved on the shaft.

[0004] Due to the cantilever beam structure of the shaft, the impeller may produce a certain degree of deflection during rotation due to the uneven stress in the circumferential direction, especially when the fluid, such as coolant, contains a high proportion of air. This not only affects the stability of the impeller rotation, but also may cause damage to the parts due to stress at the fixed end of the shaft, affecting the safety in use. SUMMARY

[0005] Therefore, it is necessary to provide a fluid pump that can effectively improve its running stability and safety.

[0006] A fluid pump comprises a pump shell, an impeller arranged in the pump shell, and a motor for driving the impeller to rotate in the pump shell. The motor comprises a stator and a rotor. The rotor is fixedly connected to the impeller through a shaft. A sleeve is arranged in the pump shell. The sleeve separates the internal space of the pump shell into a first space and a second space. The rotor, shaft, and impeller are movably arranged in the first space. The stator is fixedly arranged in the second space. The two ends of the shaft are respectively provided with a first bearing assembly and a second bearing assembly. The first bearing assembly is connected to one end of the sleeve close to the impeller.

[0007] Compared with the prior art, the fluid pump provided by the present application separates the motor stator, motor rotor, and impeller by a sleeve to avoid the influence of fluid erosion on the electrical safety of the stator. The rotor is fixedly connected to the impeller through a shaft. The two ends of the shaft are respectively provided with a first bearing assembly and a second bearing assembly, so that the two ends of the shaft can be effectively supported to avoid deflection. The impeller can rotate smoothly even if the stress in the circumferential direction is uneven, thereby improving the stability and safety of the fluid pump in operation. BRIEF DESCRIPTION OF DRAWINGS

[0008] Fig. 1 is a schematic view of an embodiment of a fluid pump according to the present application.

[0009] Fig. 2 is an exploded view of the fluid pump of Fig. 1.

[0010] Fig. 3 is a radial sectional view of the fluid pump of Fig. 1.

[0011] Fig. 4 is an axial sectional view of the fluid pump of Fig. 1.

[0012] Fig. 5 is an assembly view of the motor rotor, impeller, and sleeve of the fluid pump of Fig. 2.

[0013] Fig. 6 is an exploded view of Fig. 5.

[0014] Fig. 7 is another angle view of Fig. 6.

[0015] BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 100 fluid pump;

[0017] 10 pump housing; 10a pump housing body; 10b pump housing cover; 12 inlet; 14 outlet; 16 first space; 161 first sub-space; 163 second sub-space; 18 second space;

[0018] 20 impeller; 22 bottom plate; 24 cover plate; 26 blade; 28 first shaft hole;

[0019] 30 motor; 32 stator; 321 stator housing; 323 magnetic core; 325 coil; 327 circuit board; 34 rotor; 341 iron core; 343 permanent magnet; 345 rotor housing; 347 second shaft hole;

[0020] 40 shaft; 41 flow passage; 42 first bearing assembly; 44 second bearing assembly; 46 first bearing seat; 461 first annular rim; 462 protrusion; 463 assembly portion; 464 rib; 465 positioning sheet; 466 recess; 467 through hole; 468 second annular rim; 469 assembly hole; 47 first bearing; 48 second bearing seat; 49 second bearing;

[0021] 50 sleeve; 52 open end; 54 closed end; 56 first flange; 561 protrusion; 58 folded edge; 59 second flange. Embodiments of the present application

[0022] For the purpose of facilitating the understanding of the present application, the present application will be described in greater detail below with reference to the accompanying drawings. The accompanying drawings show one or more embodiments of the present application in order to make the understanding of the technical solutions disclosed by the present application more accurate and thorough. However, it should be understood that the present application can be implemented in many different forms and is not limited to the embodiments described below.

[0023] The same or similar reference numerals in the accompanying drawings correspond to the same or similar components; in the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms “upper”, “lower”, “left”, “right” and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationship in the drawings are used only for exemplary illustration and cannot be understood as a limitation on the present application, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0024] In addition, if the present application has a description of “first”, “second” and the like in the embodiments, the description of “first”, “second” and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implying the number of the indicated technical features. Therefore, the features limited by “first”, “second” can explicitly or implicitly include at least one of the features. In addition, “and / or” or “and / or” appearing throughout the text means that the three parallel schemes include A scheme, or B scheme, or A and B schemes are satisfied at the same time.

[0025] In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the scope of protection claimed by the present application.

[0026] The present application provides a fluid pump for driving the flow of fluid such as water, coolant and the like in the pipeline. Fig. 1-4 shows a specific embodiment of the fluid pump of the present application, the fluid pump 100 shown includes a pump housing 10, an impeller 20 arranged in the pump housing 10 and a motor 30 driving the impeller 20 to rotate in the pump housing 10.

[0027] As shown in Figs. 1-2, the pump housing 10 includes a pump housing body 10a and a pump housing cover 10b cooperating with the pump housing body 10a, wherein the impeller 20 is received in the pump housing cover 10b and the motor 30 is received in the pump housing body 10a.

[0028] The pump housing cover 10b is provided with an inlet 12 and an outlet 14, which are respectively used for connecting with external pipelines to form a fluid flow path. In the illustrated embodiment, the inlet 12 extends along the axial direction of the pump housing cover 10b, and the outlet 14 extends along the tangential direction of the outer circumferential surface of the pump housing cover 10b, and the two are substantially perpendicular to each other. After the fluid enters the pump housing 10 through the inlet 12, it is accelerated and pressurized under the action of the rotating impeller 20 and changes in flow direction, and is discharged from the pump housing 10 through the outlet 14. In other embodiments, the positions, directions, etc. of the inlet 12 and the outlet 14 of the pump housing 10 can be adjusted as needed, and the number of outlets 14 and / or inlets 12 can also be multiple, without being limited to the specific embodiments.

[0029] The impeller 20 is in the shape of a disc, and its outer diameter is slightly smaller than the inner diameter of the pump housing cover 10b, so that after assembly, a gap is formed in the radial direction between the two, so that the impeller 20 can rotate freely in the pump housing 10. In this embodiment, the impeller 20 includes a bottom plate 22 and a cover plate 24 arranged in opposite relation, and a plurality of blades 26 are arranged between the bottom plate 22 and the cover plate 24. Preferably, the blades 26 are integrally formed with the bottom plate 22 by injection molding or the like, and the cover plate 24 is connected to the bottom plate 22 by buckling or the like. In some embodiments, the cover plate 24 and the bottom plate 22 can also be connected together by ultrasonic welding or adhesive bonding. In some embodiments, the cover plate 24 and the bottom plate 22 can also be an integral structure.

[0030] Please also refer to FIGS. 2 and 4, the motor 30 is preferably an inner rotor motor, including a stator 32 and a rotor 34 rotatably arranged in the stator 32. Among them, the rotor 34 is connected together with the impeller 20 through a rotating shaft 40, so that the motor 30 can drive the impeller 20 to rotate.

[0031] Specifically, the stator 32 includes a stator shell 321, a magnetic core 323 arranged in the stator shell 321, a coil 325 wound on the magnetic core 323, and a circuit board 327 electrically connected with the coil 325, wherein the circuit board 327 is used for connecting with an external power supply to supply power to the motor 30; the rotor 34 includes an iron core 341, a permanent magnet 343, and a rotor shell 345 covering the iron core 341 and the permanent magnet 343. In this embodiment, the iron core 341 is provided with an assembly hole, and the permanent magnet 343 is embedded into the assembly hole of the iron core 341, and the whole constitutes an IPM motor. In some embodiments, the permanent magnet 343 can also be attached to the outer circumferential surface of the iron core 341, and the whole constitutes an SPM motor.

[0032] After the motor 30 is started, the circuit board 327 provides current to the coil 325 and controls the direction and size of the current in the coil 325, so that the stator 32 can generate a periodically changing rotating magnetic field, which interacts with the magnetic field established by the permanent magnet 343 of the rotor 34 to push the rotor 34 to rotate continuously, thereby driving the impeller 20 to rotate to push the fluid to flow. As shown in FIGS. 6 and 7, the central part of the bottom plate 22 of the impeller 20 is provided with a first shaft hole 28, and the central part of the rotor 34 is provided with a second shaft hole 347, and the two ends of the rotating shaft 40 are respectively inserted into the first shaft hole 28 and the second shaft hole 347, and are fixedly connected with the rotor 34 and the impeller 20 by means of bonding, buckling, welding, adhesion or the like, so that the rotor 34 and the impeller 20 can rotate synchronously.

[0033] As shown in FIG. 4, the pump housing 10 is provided with a sleeve 50, which divides the internal space of the pump housing 10 into relatively independent first and second spaces 16 and 18. The first space 16 is used to assemble the rotor 34 and the impeller 20, and the second space 18 is used to assemble the stator 32.

[0034] Please refer to FIGS. 5-7, the sleeve 50 is made of stainless steel or the like, and has a cylindrical structure with one open end 52 and one closed end 54. The open end 52 faces the impeller 20, and the closed end 54 is relatively far away from the impeller 20. The rotor 34 and the impeller 20 are arranged in the first space 16, wherein the rotor 34 is rotatably accommodated in the sleeve 50, and the impeller 20 is located outside the sleeve 50 in the axial direction. The stator 32 is arranged in the second space 18, wherein the magnetic core 323 surrounds the sleeve 50, and the circuit board 327 is attached to the closed end 54 of the sleeve 50. The stator 32 is separated from the rotor 34 and the impeller 20 by the sleeve 50, and the fluid only flows in the first space 16, which effectively avoids the fluid from eroding the stator 32 in the second space 18 and affecting the electrical safety of the motor 30 or even the fluid pump 100.

[0035] The two ends of the rotating shaft 40 are respectively provided with first and second bearing assemblies 42 and 44 for supporting the rotation of the rotor 34 and the impeller 20. The first bearing assembly 42 is arranged at the open end 52 of the sleeve 50 and includes a first bearing seat 46 and a first bearing 47 arranged at the center of the first bearing seat 46. The center of the first bearing 47 is provided with a first bearing hole for inserting the first end (such as the top end) of the rotating shaft 40. The second bearing assembly 44 is arranged at the closed end 54 of the sleeve 50 and includes a second bearing seat 48 and a second bearing 49 arranged at the center of the second bearing seat 48. The center of the second bearing 49 is provided with a second bearing hole for inserting the second end (such as the bottom end) of the rotating shaft 40. The first and second bearings 47 and 49 can be sliding bearings, ball bearings, bushings or the like, and can be the same type of bearing or different types of bearing.

[0036] In the present application, the rotating shaft 40 is fixedly connected with the impeller 20 and the rotor 34 and rotates synchronously. By arranging the first bearing 47 and the second bearing 49, effective support is formed on both ends of the rotating shaft 40, and when the rotating shaft 40 rotates synchronously with the impeller 20 and the rotor 34, even if the impeller 20 is subjected to uneven force in the circumferential direction, the rotating shaft 40 can always be kept in a coaxial state with the stator 32, so that the rotor 34 and the impeller 20 are kept in a coaxial state with the stator 32, avoiding the influence of the deflection of the rotating shaft 40 on the smooth rotation of the rotor 34 and the impeller 20, and avoiding the stress caused thereby to damage the elements, ensuring the stability and safety of the operation of the fluid pump 100, reducing the generation of noise, and prolonging the service life.

[0037] As shown in FIGS. 6 and 7, the first bearing seat 46 has a whole disc structure, and is arranged outside the opening end 52 of the sleeve 50. The outer edge of the first bearing seat 46 extends towards the side where the impeller 20 is located and has a first annular rim 461, and the first annular rim 461 abuts against the inner wall of the pump shell cover 10b to fix the first bearing assembly 42 in the pump shell 10. Preferably, the outer circumferential surface of the first annular rim 461 is provided with a plurality of protrusions 462, and the plurality of protrusions 462 are distributed at intervals in the circumferential direction of the first annular rim 461, and each protrusion 462 is fixedly fitted with the inner wall of the pump shell cover 10b, as shown in FIG. 4. In other embodiments, recesses or the like can be arranged on the inner wall of the pump shell cover 10b, and the first annular rim 461 is fixedly connected with the pump shell cover 10b by means of the concave-convex fitting or the like.

[0038] The central part of the first bearing seat 46 protrudes towards the inside of the sleeve 50 and is provided with an assembly part 463, and the assembly part 463 is provided with an assembly hole 469, and the first bearing 47 can be fixed in the assembly part 463 by means of a tight fit or the like. Preferably, the first bearing seat 46 further comprises a plurality of ribs 464 arranged around the assembly part 463, and the radially inner end of each rib 464 is integrally connected with the assembly part 463, and the radially outer end forms an arc-shaped positioning piece 465. As shown in FIG. 3, each positioning piece 465 abuts against the inner wall surface of the sleeve 50 to position the first bearing seat 46 in the radial direction.

[0039] In this embodiment, the open end 52 of the sleeve 50 is outwardly extended in the radial direction to form a first flange 56, and the first bearing seat 46 is stacked on the first flange 56. The first flange 56 of the sleeve 50 is outwardly protruded to form a protruding part 561, such as a protruding column, a protruding strip, etc., towards the first bearing seat 46; and the first bearing seat 46 is inwardly recessed to form a recessed part 466, such as a perforation, a recessed groove, etc., at the position corresponding to the protruding part 561. During assembly, the protruding part 561 of the sleeve 50 is aligned with the recessed part 466 of the first flange 56 and is recessed-protruded matched, so as to position the first bearing seat 46 and the sleeve 50 in the circumferential direction. In other embodiments, the protruding part can also be arranged on the first bearing seat 46, and the recessed part is correspondingly arranged on the first flange 56, and the positioning in the circumferential direction is also achieved through recessed-protruded matching. Of course, the first bearing seat 46 and the sleeve 50 can also be positioned in the circumferential direction through other ways, such as buckling, etc.

[0040] The first bearing seat 46 further divides the first space 16 into a first sub-space 161 and a second sub-space 163, as shown in FIG. 4, wherein the first sub-space 161 is the space between the pump cover body 10b and the first bearing seat 46, used for arranging the impeller 20; and the second sub-space 163 is the internal space of the sleeve 50, used for arranging the rotor 34. The first bearing seat 46 is provided with a perforation 467, which can be single or multiple, penetrating the first bearing seat 46 in the axial direction, and connecting the first sub-space 161 and the second sub-space 163, so that the fluid can flow from the first sub-space 161 where the impeller 20 is located to the second sub-space 163 inside the sleeve 50, and then the stator 32, especially the circuit board 327 of the stator 32, arranged on the sleeve 50 can be cooled.

[0041] The rotating shaft 40 is formed with a flow channel 41, which can be single or multiple, extending along the axial direction of the rotating shaft 40 and connecting the second sub-space 163 and the first sub-space 161, so that the fluid after absorbing heat can flow back from the second sub-space 163 to the first sub-space 161, and finally be discharged outwardly through the outlet 14. In this embodiment, the bottom end of the rotating shaft 40 is spaced apart from the closed end 54 of the sleeve 50, and the top end is between the cover plate 24 and the bottom plate 22 of the impeller 20, i.e., directly opposite the position where the impeller 20 is located. The flow channel 41 penetrates both ends of the rotating shaft 40 in the axial direction, and the fluid in the second sub-space 163 can enter the flow channel 41 from the bottom end of the rotating shaft 40, and then flow to the space between the blades 26 from the top end of the rotating shaft 40, and return to the first sub-space 161.

[0042] In some embodiments, any end of the flow channel 41 can also be bent to extend through the circumferential outer wall surface of the rotating shaft 40, at this time the fluid flows into / out of the flow channel 41 in the radial direction.

[0043] In some embodiments, the outer edge of the first flange 56 of the sleeve 50 is bent to extend to form a ring-shaped folded edge 58, which extends substantially along the axial direction of the sleeve 50 towards the closed end of the sleeve 50. Correspondingly, the outer edge of the first bearing seat 46 away from the side where the impeller 20 is located is bent to extend to form a second ring edge 468, which encircles the folded edge 58 of the sleeve 50, further positioning the first bearing seat 46 and the sleeve 50 in the radial direction.

[0044] In some embodiments, the end of the folded edge 58 of the sleeve 50 is further bent to extend to form a second flange 59, which extends outwardly along the radial direction of the sleeve 50 and is clamped between the pump shell cover 10b and the stator shell 321 in the axial direction. Preferably, the second flange 59 of the sleeve 50 is provided with a sealing member, such as a sealing ring, between the pump shell cover 10b and the stator shell 321, respectively, to ensure the sealing of the entire fluid pump 100, i.e., to avoid exposure of the fluid and to prevent water vapor, dust, and the like in the external environment from entering the fluid pump 100, thereby ensuring safe use.

[0045] In the illustrated embodiment, the stator 32 is assembled in the pump shell body 10a and partially extends out of the pump shell body 10a, the pump shell cover 10b is stacked on the stator shell 321, the second flange 59 of the sleeve 50 is clamped between the pump shell cover 10b and the stator shell 321, and a fixing member such as a screw is screwed and connected with the pump shell cover 10b after passing through the pump shell body 10a, the stator shell 321, and the second flange 59. It should be understood that the pump shell 10 generally refers to the outermost shell structure of the entire pump, and the stator shell 321 can also be regarded as a part of the pump shell 10.

[0046] In operation, the fluid pump 100 of the present application is such that the fluid enters the pump shell 10 through the inlet 12, is driven by the rotation of the impeller 20, and flows out of the pump shell 10 through the outlet 14. During the rotation of the impeller 20, the first bearing assembly 42 and the second bearing assembly 44 provide effective support to the two ends of the rotating shaft 40, avoiding uneven force in the circumferential direction of the impeller 20 from causing the rotating shaft 40 to yaw, thereby ensuring the stability and safety of the rotation of the rotor 34 and the impeller 20. A small amount of fluid enters the sleeve 50 through the perforations 467 in the first bearing seat 46, and then returns to the impeller 20 through the flow channel 41 of the rotating shaft 40. In this process, the fluid exchanges heat with the sleeve 50 to carry away the heat of the stator 32, so that the motor 30 always operates at an appropriate temperature, avoiding failure and improving electrical safety.

[0047] It should be noted that the above examples only express the preferred embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, such as the combination of different features in each embodiment, etc., which should belong to the protection scope of the present application.

Claims

1. A fluid pump comprising a pump housing, an impeller disposed in the pump housing, and a motor driving the impeller to rotate in the pump housing, characterized by, The motor comprises a stator and a rotor, the rotor is fixedly connected with the impeller through a rotating shaft; a sleeve is arranged in the pump shell, the sleeve separates the internal space of the pump shell into a first space and a second space, the rotor, the rotating shaft and the impeller are movably arranged in the first space, and the stator is fixedly arranged in the second space; the two ends of the rotating shaft are respectively provided with a first bearing assembly and a second bearing assembly, and the first bearing assembly is connected to one end of the sleeve close to the impeller.

2. The fluid pump of claim 1, wherein, The first bearing assembly comprises a first bearing seat and a first bearing arranged in the first bearing seat, the first bearing seat is connected to the sleeve, and one end of the rotating shaft is arranged in the first bearing.

3. The fluid pump of claim 2, wherein, The outer edge of the first bearing seat extends to the side where the impeller is located to form a first annular rim, and the outer circumferential surface of the first annular rim is provided with a protrusion, and the protrusion is in interference fit with the inner wall of the pump shell.

4. The fluid pump of claim 2, wherein, The sleeve is a cylindrical structure with one open end and one closed end, the first bearing seat is arranged at the open end of the sleeve, and the first space is further separated into a first sub-space and a second sub-space; the impeller is arranged in the first sub-space, and the rotor is arranged in the second sub-space; the first bearing seat is provided with a through hole, and the through hole communicates the first sub-space and the second sub-space.

5. The fluid pump of claim 4, wherein, The rotating shaft is provided with a flow channel, and the flow channel communicates the second sub-space and the first sub-space.

6. The fluid pump of claim 5, wherein, The rotating shaft and the closed end of the sleeve are axially spaced apart.

7. The fluid pump of claim 4, wherein, The open end of the sleeve extends outwardly in the radial direction to form a first flange, and the first bearing seat is stacked on the first flange; one of the first bearing seat and the first flange is provided with a convex portion, and the other is provided with a concave portion, the convex portion and the concave portion are in concave-convex fit, and the sleeve and the first bearing seat are positioned in the circumferential direction.

8. The fluid pump of claim 7, wherein, The outer edge of the first flange is bent to form an annular folded edge, the outer edge of the first bearing seat extends to the side where the open end of the sleeve is located to form a second annular rim, and the second annular rim sleeves the folded edge to position the sleeve and the first bearing seat in the radial direction.

9. The fluid pump of claim 4, wherein, The central part of the first bearing seat extends into the sleeve to form an annular assembly part, and the first bearing is arranged in the assembly part; a plurality of ribs are arranged outside the assembly part, and the radial outer end of each rib forms a positioning sheet, and the positioning sheet abuts against the inner wall of the sleeve to position the sleeve and the first bearing seat in the radial direction.

10. The fluid pump of any one of claims 1-9, wherein, The second bearing assembly comprises a second bearing seat and a second bearing arranged in the second bearing seat; the second bearing seat is fixedly arranged in the sleeve, and one end of the rotating shaft is arranged in the second bearing.

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