Rotor assembly, hydrogen pump and vehicle

Abstract

The invention discloses a rotor assembly, a hydrogen pump and a vehicle, and relates to the technical field of pump body manufacturing. The rotor shell and the shaft connecting bearing comprise a rotor shaft, a rolling piece and a bearing outer ring, the rotor shaft is connected with the rotor shell, the bearing outer ring is located outside the rotor shaft, the rolling piece is located between the rotor shaft and the bearing outer ring, and the impeller is arranged outside the bearing outer ring in a sleeving mode; the number of the rolling pieces is at least two, and the at least two sets of rolling pieces are distributed between the rotor shaft and the bearing outer ring in the axial direction of the rotor shaft in a spaced mode. According to the rotor assembly, the rolling pieces are arranged between the rotor shaft and the bearing outer ring, the impeller arranged outside the bearing outer ring in a sleeving mode can rotate on the shaft connection bearing, the number of the rolling pieces can be two, axial stress of the bearing is facilitated, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pump body manufacturing, and in particular to a rotor assembly, a hydrogen pump and a vehicle. BACKGROUND

[0002] In the related art, the rotor assembly of the hydrogen pump usually adopts two bearings, and each bearing has a set of rolling elements. When the rotor assembly bears an axial load, the two bearings bear different loads, which reduces the service life of the bearings and leaves room for improvement. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a rotor assembly that can optimize bearing stress and improve the service life of bearings.

[0004] The rotor assembly according to an embodiment of the present application comprises: an impeller; a rotor shell and a shaft connecting bearing, the shaft connecting bearing comprising a rotor shaft, rolling elements and a bearing outer ring, the rotor shaft being connected to the rotor shell, the bearing outer ring being located outside the rotor shaft, the rolling elements being located between the rotor shaft and the bearing outer ring, and the impeller being sleeved outside the bearing outer ring; wherein the rolling elements are at least two sets, and the at least two sets of rolling elements are distributed between the rotor shaft and the bearing outer ring in the axial direction of the rotor shaft.

[0005] The rotor assembly according to an embodiment of the present application can make the impeller sleeved outside the bearing outer ring rotate on the shaft connecting bearing by arranging the rolling elements between the rotor shaft and the bearing outer ring. The rolling elements can be arranged in two sets, which is beneficial to the axial stress of the bearing and improves the service life of the bearing.

[0006] The rotor assembly according to some embodiments of the present application, the inner circumferential wall of the bearing outer ring is formed with at least two inner rolling grooves, the outer circumferential wall of the rotor shaft is formed with at least two outer rolling grooves, at least two inner rolling grooves and at least two outer rolling grooves are distributed in one-to-one correspondence in the radial direction of the rotor shaft to form at least two sets of bearing grooves, and at least two sets of rolling elements are arranged in one-to-one correspondence in the at least two sets of bearing grooves.

[0007] The rotor assembly according to some embodiments of the present application, each set of rolling elements is a plurality of rolling elements, and the plurality of rolling elements are distributed between the inner rolling grooves and the outer rolling grooves in the circumferential direction of the rotor shaft.

[0008] The rotor assembly according to some embodiments of the present application, the rotor shaft comprises a connecting shaft segment and a rotationally fitted shaft segment, the connecting shaft segment is threadedly connected to the rotor shell, the bearing outer ring is sleeved outside the rotationally fitted shaft segment, and the rolling elements are located between the bearing outer ring and the rotationally fitted shaft segment.

[0009] According to the rotor assembly of some embodiments of the present application, the rotor housing is formed with an open-sided accommodating recess, the rotor housing is provided with a connecting hole in the accommodating recess, the connecting hole is in communication with the accommodating recess along the axial direction of the connecting hole, the connecting shaft section is threadedly connected with the connecting hole, and at least part of the impeller is located in the accommodating recess.

[0010] According to the rotor assembly of some embodiments of the present application, the rotor shaft further comprises an intermediate shaft section connected between the connecting shaft section and the rotationally fitted shaft section, and the intermediate shaft section is provided with a gasket. The outer diameter of the rotationally fitted shaft section is greater than the outer diameter of the connecting shaft section, so as to form a limiting surface on the end surface of the rotationally fitted shaft section, and the gasket is located between the limiting surface and the outer end surface of the open end of the connecting hole.

[0011] According to the rotor assembly of some embodiments of the present application, the rotor shaft further comprises a lead-in section connected to the end of the connecting shaft section away from the rotationally fitted shaft section, and the outer diameter of the lead-in section is configured to gradually decrease in the direction away from the connecting shaft section.

[0012] According to the rotor assembly of some embodiments of the present application, the installation hole is formed in the impeller and penetrates through in the axial direction, the bearing outer ring is located in the installation hole, the installation hole is provided with a limiting portion protruding in the radial direction at the end close to the rotor housing, and the bearing outer ring is limited and pressed in the axial direction against the limiting portion.

[0013] The present application further provides a hydrogen pump.

[0014] The hydrogen pump according to the embodiments of the present application comprises the rotor assembly according to any one of the above embodiments.

[0015] The present application further provides a vehicle.

[0016] The vehicle according to the embodiments of the present application comprises the rotor assembly according to any one of the above embodiments or the hydrogen pump according to the above embodiments.

[0017] The vehicle, the hydrogen pump and the rotor assembly according to the above embodiments have the same advantages as the prior art, which will not be described here again.

[0018] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the following drawings, in which: Figure 1is a structure schematic of a rotor assembly of an embodiment of the present application Figure One ; Figure 2 is a structure schematic of a rotor assembly of an embodiment of the present application Figure Two ; Figure 3 is a structure schematic of a tightening slot hole of an embodiment of the present application.

[0020] Reference signs: rotor assembly 100, impeller 1, limiting part 11, rotor housing 2, containing sink 21, axle connecting bearing 3, rotor shaft 31, connecting shaft section 311, rotating fitting shaft section 312, limiting surface 3121, intermediate shaft section 313, gasket 314, lead-in section 315, tightening slot hole 316, rolling element 32, bearing outer ring 33, bearing groove 34, outer rolling groove 341, inner rolling groove 342. DETAILED DESCRIPTION

[0021] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations 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, only for explaining the present application, and cannot be understood as a limitation of the present application.

[0022] In the description of the present application, it is 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, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation of the present application. In addition, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more. In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] Reference will be made to Figures 1-3 The rotor assembly 100 according to the embodiment of the present application is described below. By arranging the rolling element 32 between the rotor shaft 31 and the bearing outer ring 33, the impeller 1 sleeved outside the bearing outer ring 33 can rotate on the shaft connecting bearing 3, and the rolling element 32 can be arranged in two groups to facilitate the axial force of the bearing and improve the service life.

[0024] As Figure 1 and Figure 2 The rotor assembly 100 according to the embodiment of the present application includes the impeller 1, the rotor housing 2, and the shaft connecting bearing 3.

[0025] The impeller 1 is a core rotating component in a hydrogen pump, which can convert mechanical energy from a motor or a turbine into kinetic energy of hydrogen to achieve flow guiding of hydrogen.

[0026] The rotor housing 2 is arranged outside the shaft connecting bearing 3 and the impeller 1, which can protect the shaft connecting bearing 3 and the impeller 1, such as reducing the external impact force acting on the impeller 1 and the shaft connecting bearing 3, avoiding damage to the impeller 1 and the shaft connecting bearing 3 under the action of external force, and maximizing the prevention of foreign matter from entering the inside of the rotor assembly 100 to improve the durability of the structure; and the rotor housing 2 can support and fix the shaft connecting bearing 3 and the impeller 1 to make the impeller 1 rotate to drive the movement of hydrogen.

[0027] The shaft connecting bearing 3 includes the rotor shaft 31, the rolling element 32, and the bearing outer ring 33. The rotor shaft 31 is connected with the rotor housing 2, the bearing outer ring 33 is located outside the rotor shaft 31, and the rolling element 32 is located between the rotor shaft 31 and the bearing outer ring 33. The impeller 1 is sleeved outside the bearing outer ring 33. That is, the rotor shaft 31 can be fixedly connected with the rotor housing 2, so as to realize the relative fixation of the shaft connecting bearing 3 and the rotor housing 2; and the rolling element 32 is arranged between the rotor shaft 31 and the bearing outer ring 33, that is, the bearing outer ring 33 can rotate relative to the rotor shaft 31 through the rolling element 32, so that the impeller 1 can rotate.

[0028] Specifically, the rotor shaft 31 is fixedly connected with the rotor housing 2, the impeller 1 is sleeved outside the bearing outer ring 33, and the impeller 1 can rotate on the rotor shaft 31 through the rolling elements 32 and the bearing outer ring 33, so that the rotation of the impeller 1 in the rotor housing 2 is realized.

[0029] The rolling elements 32 are at least two groups, and the at least two groups of rolling elements 32 are distributed between the rotor shaft 31 and the bearing outer ring 33 in the axial direction of the rotor shaft 31. That is, the rolling elements 32 can be provided in two groups, three groups, or more groups, and the number of groups is flexibly optional, and the plurality of groups of rolling elements 32 can be arranged between the rotor shaft 31 and the bearing outer ring 33 in the axial direction of the rotor shaft 31.

[0030] Specifically, the rolling elements 32 can be provided in two groups, and the two groups of rolling elements 32 are arranged between the rotor shaft 31 and the bearing outer ring 33, and the two groups of rolling elements 32 are distributed in the axial direction of the rotor shaft 31. When the impeller 1 rotates, the rolling elements 32 can simultaneously roll with the rotor shaft 31 and the bearing outer ring 33, so that the impeller 1 and the bearing outer ring 33 can rotate relative to the rotor shaft 31.

[0031] Therefore, the rotation of the impeller 1 on the rotor housing 2 can be realized through the rotor shaft 31, the rolling elements 32 and the bearing outer ring 33, and the shaft connecting bearing 3 has two groups of rolling elements 32, in other words, at least two groups of rolling elements 32 are supported between the same group of rotor shaft 31 and bearing outer ring 33, so that the at least two groups of rolling elements 32 share the same group of rotor shaft 31 and bearing outer ring 33. In this way, the rotor shaft 31 or the bearing outer ring 33 can more evenly distribute the axial force received to the at least two groups of rolling elements 32, so that the axial force received by each group of rolling elements 32 is more uniform. Compared with two single groups of rolling elements 32 of the bearing, the axial force can be avoided to be concentrated on one of the bearings, that is, each group of rolling elements 32 can share the axial force, so as to avoid the single bearing from being damaged too quickly due to excessive force, thereby optimizing the bearing force and improving the service life of the bearing.

[0032] According to the rotor assembly 100 of the embodiment of the present application, by arranging at least two groups of rolling elements 32 between the rotor shaft 31 and the bearing outer ring 33, the impeller 1 sleeved outside the bearing outer ring 33 can rotate on the shaft connecting bearing 3, and the at least two groups of rolling elements 32 share the rotor shaft 31 and the bearing outer ring 33, which is beneficial to balance the axial force of each rolling element 32 and improve the service life of the bearing.

[0033] In some embodiments, the inner circumferential wall of the bearing outer ring 33 is formed with at least two inner rolling grooves 342, the outer circumferential wall of the rotor shaft 31 is formed with at least two outer rolling grooves 341, the at least two inner rolling grooves 342 and the at least two outer rolling grooves 341 are distributed in one-to-one correspondence along the radial direction of the rotor shaft 31 to form at least two groups of bearing grooves 34, and the at least two groups of rolling elements 32 are arranged in one-to-one correspondence in the at least two groups of bearing grooves 34. That is, the inner circumferential wall of the bearing outer ring 33 can be provided with two, three or more inner rolling grooves 342, the outer circumferential wall of the rotor shaft 31 can be provided with two, three or more outer rolling grooves 341, and the specific number of inner rolling grooves 342 and outer rolling grooves 341 can be flexibly selected. A plurality of inner rolling grooves 342 and a plurality of outer rolling grooves 341 can be matched in one-to-one correspondence to form a plurality of groups of bearing grooves 34, and the rolling elements 32 can be arranged in the bearing grooves 34 to realize the rotation of the bearing outer ring 33 relative to the rotor shaft 31.

[0034] Specifically, as shown in Figure 1 and Figure 2 , the inner rolling grooves 342 can be provided in two and arranged on the inner circumferential wall of the bearing outer ring 33, the outer rolling grooves 341 can be provided in two and arranged on the outer circumferential wall of the rotor shaft 31, the two outer rolling grooves 341 and the two inner rolling grooves 342 can be matched in one-to-one correspondence to define two bearing grooves 34, and two groups of rolling elements 32 can be arranged in the two bearing grooves 34 respectively to enable the rolling elements 32 to roll between the rotor shaft 31 and the bearing outer ring 33.

[0035] Therefore, the impeller 1 and the bearing outer ring 33 can rotate relative to the rotor shaft 31 through the rolling elements 32, that is, the rolling elements 32 can roll between the rotor shaft 31 and the bearing outer ring 33, which has small rolling friction, so that the impeller 1 and the bearing outer ring 33 can rotate relative to the rotor shaft 31.

[0036] Among them, the shaft connecting bearing 3 can be provided as a deep groove ball bearing, the outer rolling groove 341 and the inner rolling groove 342 can be matched with the rolling element 32, for example, the inner rolling groove 342 can be configured as an annular groove recessed towards the bearing outer ring 33, the outer rolling groove 341 can be provided as an annular groove recessed towards the rotor shaft 31, and the rolling element 32 can be provided as a ball, so that the ball can extend into the two annular grooves matched therewith, at this time, the inner wall of the annular groove can be in abutment with the outer wall of the spherical member to enable the annular groove and the ball to be limited in the axial direction. Therefore, the shaft connecting bearing 3 can bear external force in the axial direction, and the two groups of rolling elements 32 can share the external force with each other, so that the external force in the axial direction can be avoided to be concentrated on one bearing, and the service life of the bearing is improved.

[0037] In addition, the shaft connecting bearing 3 can be an angular contact bearing, that is, the line connecting the contact point of the outer rolling groove 341 and the rolling element 32 and the contact point of the inner rolling groove 342 and the rolling element 32 forms a contact angle with the radial direction of the bearing, and the angle of the contact angle can be 15°, 25°, 30°, or other angles. Thus, when an axial external force acts on the bearing, the rotor shaft 31 and the bearing outer ring 33 can be axially limited by the rolling element 32, and the axial bearing capacity is stronger; and the two groups of rolling elements 32 can realize axial limitation in two directions.

[0038] In some embodiments, each group of rolling elements 32 is a plurality, and the plurality of rolling elements 32 is distributed between the inner rolling groove 342 and the outer rolling groove 341 along the circumference of the rotor shaft 31. That is, a plurality of rolling elements 32 can be arranged in each bearing groove 34, and the plurality of rolling elements 32 can cooperate to realize the relative rotation of the bearing outer ring 33 and the rotor shaft 31, thereby realizing the rotation of the impeller 1 on the shaft connecting bearing 3.

[0039] Specifically, during the rotation of the impeller 1 and the bearing outer ring 33, the plurality of rolling elements 32 can roll in the bearing groove 34 to enable the bearing outer ring 33 to rotate relative to the rotor shaft 31, the plurality of rolling elements 32 can share the radial force of the shaft connecting bearing 3 and can share the axial force, thereby avoiding the concentration of external force on a single rolling element 32; and the plurality of rolling elements 32 can avoid the bearing outer ring 33 and the rotor shaft 31 from being in contact, thereby avoiding generating greater sliding friction, which is beneficial to the rotation of the impeller 1 and the bearing outer ring 33.

[0040] Thus, by arranging a plurality of rolling elements 32 in the bearing groove 34, the plurality of rolling elements 32 can collectively share the force of the bearing, so that the bearing can bear greater radial force and axial force, and the plurality of rolling elements 32 can avoid generating sliding friction between the bearing outer ring 33 and the rotor shaft 31, which is beneficial to the rotation of the impeller 1 and the bearing outer ring 33.

[0041] In some embodiments, the rotor shaft 31 includes a connecting shaft segment 311 and a rotationally fitted shaft segment 312, the connecting shaft segment 311 is threadedly connected with the rotor housing 2, the bearing outer ring 33 is sleeved outside the rotationally fitted shaft segment 312, and the rolling element 32 is located between the bearing outer ring 33 and the rotationally fitted shaft segment 312. That is, the rotor shaft 31 is connected with the rotor housing 2 through the connecting shaft segment 311 and the rotationally fitted shaft segment 312, respectively, and rotationally fitted with the bearing outer ring 33.

[0042] Specifically, as shown in FIG. 4, the rotor shaft 31 includes a connecting shaft segment 311 and a rotationally fitted shaft segment 312, the connecting shaft segment 311 is threadedly connected with the rotor housing 2, the bearing outer ring 33 is sleeved outside the rotationally fitted shaft segment 312, and the rolling element 32 is located between the bearing outer ring 33 and the rotationally fitted shaft segment 312. Figure 1 and Figure 2As shown, the connecting shaft section 311 is threadedly connected to the rotor housing 2. The connecting shaft section 311 can be screwed onto the rotor housing 2 to achieve the connection and fixation between the rotor shaft 31 and the rotor housing 2. A rolling element 32 can be provided between the rotating fitting shaft section 312 and the bearing outer ring 33 so that the bearing outer ring 33 can rotate outside the rotating fitting shaft section 312.

[0043] Thus, by connecting shaft segment 311 and rotating fitting shaft segment 312, the rotor shaft 31 and rotor housing 2 can be connected and fixed. Furthermore, by rotating fitting shaft segment 312, the bearing outer ring 33 and rotor shaft 31 can be rotated, thereby allowing the impeller 1 to rotate relative to the rotor shaft 31 and realize the rotation of the impeller 1 within the rotor housing 2.

[0044] In some embodiments, the rotor housing 2 has a receiving groove 21 open on one side. The rotor housing 2 has a connecting hole in the receiving groove 21, which communicates with the receiving groove 21 axially. A connecting shaft section 311 is threaded into the connecting hole, and at least a portion of the impeller 1 is located within the receiving groove 21. That is, the impeller 1 and the rotor shaft 31 can be fixedly connected to the rotor housing 2 through the receiving groove 21 and the connecting hole.

[0045] Specifically, such as Figure 1 and Figure 2 As shown, the rotor housing 2 can form a right-open receiving groove 21, and a connecting hole extending axially into the rotor housing 2 is formed in the receiving groove 21. The connecting hole can be threaded with the rotor shaft 31. For example, the connecting shaft section 311 of the rotor shaft 31 can be extended axially into the connecting hole, and the connecting shaft section 311 is threadedly connected to the connecting hole, thereby realizing the connection and fixation of the rotor shaft 31 and the rotor housing 2. In addition, the rotor housing 2 can avoid the impeller 1 through the receiving groove 21, so that the impeller 1 can be connected and fixed on the rotor housing 2 together with the rotor shaft 31, realizing the rotation of the impeller 1 in the rotor housing 2.

[0046] Thus, by accommodating the sink 21 and the connecting hole, the rotor shaft 31 and the impeller 1 can be connected and fixed to the rotor housing 2, and the impeller 1 can rotate inside the rotor housing 2.

[0047] Tightening slots 316 can be provided on the rotor shaft 31, such as... Figures 1-3 As shown, the tightening slot 316 can be set at the end of the rotating mating shaft section 312 away from the connecting shaft section 311, and the tightening slot 316 can be set as a regular hexagonal groove. When the rotor shaft 31 is threadedly connected to the rotor housing 2, the rotor shaft 31 can be applied to the rotor shaft 31 through the tightening slot 316 so that the rotor shaft 31 can be tightened toward the rotor housing 2, thereby realizing the threaded connection between the rotor shaft 31 and the rotor housing 2, and the connection strength is higher.

[0048] In some embodiments, the rotor shaft 31 further comprises an intermediate shaft segment 313 connected between the connecting shaft segment 311 and the rotationally fitted shaft segment 312, and the intermediate shaft segment 313 is sleeved with a gasket 314. That is, the gasket 314 can be arranged between the rotor shaft 31 and the rotor housing 2, so that the rotor housing 2 and the impeller 1 have a certain gap.

[0049] Specifically, as shown in Figure 1 and Figure 2 , the gasket 314 can be sleeved outside the intermediate shaft segment 313. When the rotor shaft 31 is threadedly connected with the rotor housing 2, the gasket 314 can prevent the impeller 1 from contacting the rotor housing 2, thereby avoiding interference between the impeller 1 and the rotor housing 2 during rotation of the impeller 1, and facilitating rotation of the impeller 1.

[0050] The outer diameter of the rotationally fitted shaft segment 312 is greater than that of the connecting shaft segment 311, so as to form a limiting surface 3121 on the end face of the rotationally fitted shaft segment 312, and the gasket 314 is located between the limiting surface 3121 and the outer end face of the open end of the connecting hole. That is, the rotor shaft 31 and the rotor housing 2 can abut against the gasket 314 through the limiting surface 3121 and the outer end face of the connecting hole, thereby realizing rotation of the impeller 1 in the rotor housing 2.

[0051] Specifically, as shown in Figure 1 and Figure 2 , the gasket 314 is sleeved outside the intermediate shaft segment 313, and the left end of the gasket 314 abuts against the outer end face of the open end of the connecting hole, and the right end of the gasket 314 abuts against the end face of the rotationally fitted shaft segment 312. The gasket 314 can prevent the rotor shaft 31 from continuing to approach the rotor housing 2, so that the impeller 1 can have a movable gap with the rotor housing 2, thereby enabling the impeller 1 to rotate in the rotor housing 2.

[0052] The thickness of the gasket 314 can be flexibly set as needed. When the thickness of the gasket 314 is large, the movable gap between the rotor housing 2 and the impeller 1 can be larger, and when the thickness of the gasket 314 is small, the movable gap between the rotor housing 2 and the impeller 1 can be smaller. That is, the thickness of the gasket 314 can be controlled to flexibly control the size of the movable gap between the rotor housing 2 and the impeller 1.

[0053] In some embodiments, the rotor shaft 31 further comprises a lead-in segment 315 connected to one end of the connecting shaft segment 311 away from the rotationally fitted shaft segment 312, and the outer diameter of the lead-in segment 315 is configured to gradually decrease in a direction away from the connecting shaft segment 311.

[0054] Specifically, as shown in Figure 1 and Figure 2 , the gasket 314 is sleeved outside the intermediate shaft segment 313, and the left end of the gasket 314 abuts against the outer end face of the open end of the connecting hole, and the right end of the gasket 314 abuts against the end face of the rotationally fitted shaft segment 312. The gasket 314 can prevent the rotor shaft 31 from continuing to approach the rotor housing 2, so that the impeller 1 can have a movable gap with the rotor housing 2, thereby enabling the impeller 1 to rotate in the rotor housing 2.As shown, the lead-in section 315 can be arranged at the left end of the connecting shaft section 311, and the outer diameter of the lead-in section 315 gradually decreases along the axial direction to the left. During the process of connecting the connecting shaft section 311 and the connecting hole by screwing, the lead-in section 315 can guide the connecting shaft section 311, so that the connecting shaft section 311 can be screwed with the connecting hole, facilitating the connection of the connecting shaft section 311 and the connecting hole.

[0055] Therefore, the lead-in section 315 can facilitate the threaded connection of the rotor shaft 31 and the rotor housing 2, and facilitate the assembly of the impeller 1 and the rotor housing 2.

[0056] In some embodiments, the impeller 1 is formed with an installation hole penetrating along the axial direction, and the bearing outer ring 33 is located in the installation hole. A limiting portion 11 protruding radially is arranged at one end of the installation hole close to the rotor housing 2, and the bearing outer ring 33 is limited and pressed along the axial direction by the limiting portion 11. That is, the limiting portion 11 can limit the bearing outer ring 33, so that the bearing outer ring 33 and the impeller 1 can be relatively fixed in the axial direction.

[0057] Specifically, as shown in Figure 1 and Figure 2 the limiting portion 11 protrudes radially inward at one end of the installation hole of the impeller 1 close to the rotor housing 2, so that the limiting portion 11 is pressed at one end of the bearing outer ring 33 close to the rotor housing 2, thereby enabling the impeller 1 and the bearing outer ring 33 to be axially limited relative to each other, and avoiding displacement of the impeller 1 away from the rotor housing 2, so that the impeller 1 and the rotor housing 2 are installed and fixed.

[0058] Therefore, by pressing the limiting portion 11 and the bearing outer ring 33, the impeller 1 and the rotor housing 2 can be installed and fixed, and the impeller 1 can rotate in the rotor housing 2.

[0059] The application further provides a hydrogen pump.

[0060] The hydrogen pump according to the embodiments of the application comprises the rotor assembly 100 of any of the above embodiments. The rotor assembly 100 can guide the flow of hydrogen, and can withstand axial external force, reducing damage to the structure caused by the magnetic pull generated by the stator on the rotor assembly 100.

[0061] The application further provides a vehicle.

[0062] The vehicle according to the embodiments of the application comprises the rotor assembly 100 of any of the above embodiments, or comprises the hydrogen pump of the above embodiments. By arranging the rolling member 32 between the rotor shaft 31 and the bearing outer ring 33, the impeller 1 sleeved outside the bearing outer ring 33 can rotate on the shaft bearing 3, and the rolling member 32 can be arranged in two groups, facilitating the axial force of the bearing and improving the service life of the bearing.

[0063] In the description of the specification, reference to "one embodiment", "some embodiments", "an exemplary embodiment", "an example", "a specific example", or "some examples" means that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The appearances of the phrases "in one embodiment", "in some embodiments", "in an exemplary embodiment", "an example", "a specific example", or "some examples" in various places in the specification are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0064] Although embodiments of the application have been shown and described, it will be appreciated that those skilled in the art can make various changes, modifications, substitutions and alterations thereto without departing from the principles and scope of the application, which are defined by the claims and their equivalents.

Claims

1. A rotor assembly, characterized in that, include: Impeller (1); The rotor housing (2) and the shaft-connecting bearing (3) include a rotor shaft (31), rolling elements (32) and a bearing outer ring (33). The rotor shaft (31) is connected to the rotor housing (2). The bearing outer ring (33) is located outside the rotor shaft (31). The rolling elements (32) are located between the rotor shaft (31) and the bearing outer ring (33). The impeller (1) is sleeved outside the bearing outer ring (33). The rolling elements (32) are at least two sets, and the at least two sets of rolling elements (32) are distributed axially between the rotor shaft (31) and the outer ring (33) of the bearing.

2. The rotor assembly according to claim 1, characterized in that, The inner peripheral wall of the outer ring (33) of the bearing has at least two inner rolling grooves (342), and the outer peripheral wall of the rotor shaft (31) has at least two outer rolling grooves (341). The at least two inner rolling grooves (342) and the at least two outer rolling grooves (341) are distributed one-to-one opposite each other along the radial direction of the rotor shaft (31) to form at least two sets of bearing grooves (34). The at least two sets of rolling elements (32) are correspondingly arranged in the at least two sets of bearing grooves (34).

3. The rotor assembly according to claim 2, characterized in that, Each group has multiple rolling elements (32), and the multiple rolling elements (32) are distributed circumferentially between the inner rolling groove (342) and the outer rolling groove (341) along the rotor shaft (31).

4. The rotor assembly according to claim 1, characterized in that, The rotor shaft (31) includes a connecting shaft section (311) and a rotating fitting shaft section (312). The connecting shaft section (311) is threadedly connected to the rotor housing (2). The bearing outer ring (33) is sleeved outside the rotating fitting shaft section (312). The rolling element (32) is located between the bearing outer ring (33) and the rotating fitting shaft section (312).

5. The rotor assembly according to claim 4, characterized in that, The rotor housing (2) has an open-sided receiving groove (21). The rotor housing (2) has a connecting hole in the receiving groove (21). The connecting hole communicates with the receiving groove (21) along the axial direction of the connecting hole. The connecting shaft section (311) is threadedly engaged with the connecting hole. At least a portion of the impeller (1) is located in the receiving groove (21).

6. The rotor assembly according to claim 5, characterized in that, The rotor shaft (31) further includes an intermediate shaft section (313) connecting the connecting shaft section (311) and the rotating mating shaft section (312), and the intermediate shaft section (313) is fitted with a gasket (314). The outer diameter of the rotating mating shaft section (312) is larger than the outer diameter of the connecting shaft section (311) so as to form a limiting surface (3121) on the end face of the rotating mating shaft section (312), and the gasket (314) is located between the limiting surface (3121) and the outer end face of the open end of the connecting hole.

7. The rotor assembly according to claim 5, characterized in that, The rotor shaft (31) further includes an inlet section (315), which is connected to the end of the connecting shaft section (311) away from the rotating mating shaft section (312). The outer diameter of the inlet section (315) is configured to gradually decrease in the direction away from the connecting shaft section (311).

8. The rotor assembly according to claim 1, characterized in that, An axially penetrating mounting hole is formed inside the impeller (1). The bearing outer ring (33) is located inside the mounting hole. A radially protruding limiting part (11) is provided at one end of the mounting hole near the rotor housing (2). The bearing outer ring (33) is axially limited and pressed against the limiting part (11).

9. A hydrogen pump, characterized in that, The rotor assembly includes any one of claims 1-8.

10. A vehicle, characterized in that, It includes the rotor assembly according to any one of claims 1-8, or the hydrogen pump according to claim 9.

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