CN216312780U - Fluid driving device - Google Patents

Abstract

The utility model discloses a fluid driving device, which comprises a stator assembly, a rotor assembly and an isolation cover, wherein the fluid driving device is provided with a first cavity and a second cavity, the stator assembly is positioned in the first cavity, the rotor assembly is positioned in the second cavity, the isolation cover is positioned between the first cavity and the second cavity and isolates the first cavity from the second cavity, the fluid driving device also comprises a positioning shaft and a connecting piece, the positioning shaft is sleeved on the inner surface side of the rotor assembly, the connecting piece is positioned in the second cavity, the positioning shaft comprises an installation section, at least part of the installation section is in limit connection with the connecting piece, the isolation cover comprises a bottom wall part and a side wall part protruding out of the bottom wall part, and part of the circumferential surface of the connecting piece is in limit connection with the inner surface of the side wall part of the isolation cover; this reduces the risk of cracking of the insulation cover.

Description

Fluid driving device

Technical Field

The utility model relates to the field of fluid control, in particular to a fluid driving device.

Background

In general, the fluid driving device needs to be provided with a separation cover to separate the stator assembly and the rotor assembly and prevent the working medium from contacting with the stator assembly.

The fluid driving device further comprises a positioning shaft, so that the rotor assembly can rotate around the positioning shaft, one end of the positioning shaft is directly connected with the isolation cover in a limiting mode, and stress concentration is easily generated at the connecting position of the positioning shaft and the isolation cover due to the fact that the wall thickness of the isolation cover is thin, and the isolation cover is enabled to have cracking risks.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a fluid driving device, which can reduce the cracking risk of an isolation cover.

The embodiment of the utility model provides a fluid driving device, which comprises a stator assembly, a rotor assembly and a shield, wherein the fluid driving device is provided with a first cavity and a second cavity, the stator assembly is positioned in the first cavity, the rotor assembly is positioned in the second cavity, and the shield is positioned between the first cavity and the second cavity and separates the first cavity from the second cavity;

the fluid driving device further comprises a positioning shaft and a connecting piece, at least part of the positioning shaft is located on the inner side of the rotor assembly, the connecting piece is located in the second cavity, the positioning shaft comprises an installation section, at least part of the installation section is in limit connection with the connecting piece, the isolation cover comprises a bottom wall portion and a side wall portion protruding out of the bottom wall portion, and at least part of the connecting piece is in limit connection with the side wall portion of the isolation cover.

According to the fluid driving device provided by the embodiment of the utility model, the fluid driving device comprises the positioning shaft, the connecting piece and the isolation cover, wherein the positioning shaft comprises the mounting section, at least part of the mounting section is in limit connection with the connecting piece, and compared with the situation that the positioning shaft is directly in limit connection with the isolation cover, the fluid driving device provided by the embodiment of the utility model has the advantages that the stress concentration of the isolation cover can be reduced and the cracking risk of the isolation cover is reduced by arranging the connecting piece in limit connection with the mounting section of the positioning shaft; further, the isolation cover comprises a bottom wall portion and a side wall portion, at least part of the circumferential surface of the connecting piece is in limit connection with the inner surface of the side wall portion of the isolation cover, so that stress of the connecting piece and the isolation cover at the connection position can be dispersed, and the cracking risk of the isolation cover can be further reduced through the arrangement.

Drawings

Fig. 1 is a schematic perspective view of a fluid driving device according to an embodiment of the present invention;

fig. 2 is an exploded structural view of a partial structure of the fluid driving device shown in fig. 1;

FIG. 3 is a schematic cross-sectional view of a fluid driving device according to an embodiment of the present invention;

FIG. 4 is an enlarged schematic view of the structure of FIG. 3 in the region Q;

FIG. 5 is a schematic view of a combination of a shield, a positioning shaft and a connecting member according to an embodiment of the present invention;

FIG. 6 is a schematic front view of a combination structure of a shielding case, a positioning shaft and a connecting member according to an embodiment of the present invention;

FIG. 7 is a schematic cross-sectional view taken along A-A of one of the composite structures shown in FIG. 6;

FIG. 8 is a schematic cross-sectional view taken along A-A of the alternative composite structure shown in FIG. 6;

FIG. 9 is a schematic structural view of a connector according to an embodiment of the present invention;

fig. 10 is a schematic cross-sectional structure of the composite structure shown in fig. 6 at one of the locations.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Herein, relational terms such as "first" and "second", and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.

The fluid driving device provided by the embodiment of the utility model can provide flowing power for the working medium of the automobile thermal management system, the working medium can be water or aqueous solution, such as aqueous solution containing 50% of glycol, and the working medium can also be other substances.

Referring to fig. 1 to 5, an embodiment of the present invention provides a fluid driving device 1, including a first housing 104, a second housing 103, a stator assembly 20, a rotor assembly 30, a positioning shaft 50, and a shielding cover 40, where the first housing 104 and the second housing 103 are connected to each other, the fluid driving device 1 has an inner cavity, at least a portion of the inner cavity is located in the first housing 104 and the second housing 103, the shielding cover 40 may be connected to the first housing 104 through a fastener 105, the shielding cover 40 divides the inner cavity into a first cavity 101 and a second cavity 102, that is, the shielding cover 40 is located between the first cavity 101 and the second cavity 102 and separates the first cavity 101 and the second cavity 102, the first cavity 101 is not in direct contact with a working medium, the second cavity 102 may have the working medium flowing through, the stator assembly 20 is located in the first cavity 101, and the rotor assembly 30 is located on an inner surface side of the positioning shaft 50 sleeved on the rotor assembly 30 in the second cavity 102. Referring to fig. 3, the stator assembly 20 includes a stator core 21, an insulating frame 23, and a winding 22, where the insulating frame 23 covers at least a portion of the surface of the stator core 21, and the winding 22 is wound around the insulating frame 23; the rotor assembly 30 includes a permanent magnet 31 and an impeller assembly 32, and when the fluid driving device 1 is in operation, the rotor assembly 30 rotates around the positioning shaft 50 or along with the positioning shaft 50 under the action of an excitation magnetic field by controlling the current passing through the windings 22 of the stator assembly 20 and further controlling the excitation magnetic field generated by the stator assembly 20.

As shown in fig. 3 to 8, the fluid driving device 1 further includes a connecting member 60, the connecting member 60 is located in the second cavity 102, the positioning shaft 50 includes a mounting section 51, at least a portion of the mounting section 51 is in limit connection with the connecting member 60, it should be noted that the limit connection herein may be an interference fit or a fixed connection, wherein the fixed connection can be welding, or bonding, or screwing, or fixed connection through a fastener, or the positioning shaft and the groove of the isolation cover are in a structure integrally formed, compared with the mode that the groove structure is arranged on the isolation cover and the positioning shaft and the groove of the isolation cover are in limit connection, the embodiment of the utility model has the advantages that the depth of the groove manufactured on the isolation cover 40 can be reduced or the groove structure manufactured on the isolation cover 40 is cancelled by the limit connection of the connecting piece 60 and the positioning shaft 50, the stress concentration of the isolation cover 40 is favorably reduced, and the cracking risk of the isolation cover 40 can be reduced.

Further, the isolation cover 40 can be formed by a stamping process, as shown in fig. 7 and 8, the isolation cover 40 includes a bottom wall portion 41 and a side wall portion 42 protruding from the bottom wall portion 41, the side wall portion 42 of the isolation cover 40 has a higher rigidity than the bottom wall portion 41, at least a portion of the connecting member 60 is connected to the side wall portion 42 of the isolation cover 40 in a limited manner, optionally, a portion of the circumferential surface of the connecting member 60 is connected to the inner surface of the side wall portion 42 of the isolation cover 40 in a limited manner, for example, the connecting member 60 can be connected to the inner surface of the side wall portion 42 of the isolation cover 40 in a stable manner by an interference fit or an adhesive, and by the above arrangement, the risk of cracking of the isolation cover 40 can be reduced and the connecting member 60 can be connected to the isolation cover 40 stably.

In some embodiments, as shown in fig. 7, the isolation cover 40 may be a stamped component, the bottom wall portion 41 of the isolation cover 40 includes a plate structure 412, the connecting member 60 includes a mounting portion 61, the mounting portion 61 has a mounting hole 611, and at least a portion of the mounting segment 51 is inserted into the mounting hole 61 to limit the mounting segment 51 to the connecting member 60. Through the arrangement, the installation section 51 of the positioning shaft 50 is conveniently embedded into the installation hole 611 of the connecting piece 60, and the connection stability of the positioning shaft 50 and the connecting piece 60 is improved.

Referring to fig. 7, the bottom wall 41 includes a flat plate structure 412 and a concave portion 411, the concave portion 411 extends from the flat plate structure 412 into the first cavity 101, a portion of the mounting section 51 is connected to the connecting member 60 along the axial direction of the positioning shaft 50, another portion of the mounting section 51 is embedded in the concave portion 411, and the outer surface of the mounting section 51 is in interference fit with the inner surface of the concave portion 411. Through the arrangement, compared with the mode that the bottom wall part 41 is provided with the groove matched with the height of the mounting section 51, the depth of the concave part 411 can be reduced, the manufacturing difficulty of the isolation cover 40 is reduced, and the strength of the isolation cover 40 can be improved.

Alternatively, as shown in fig. 8, the isolation cover 40 is a stamping part, the bottom wall portion 41 is a flat plate structure, and the height of the mounting portion 61 along the axial direction of the positioning shaft 50 may be greater than the thickness of the bottom wall portion 41 of the isolation cover 40, and since the isolation cover 40 is thin and is formed by a stamping process, by providing the bottom wall portion 41 as a flat plate structure, compared with the case that the bottom wall portion 41 is provided with a groove matching the height of the mounting section 51, the manufacturing difficulty of the isolation cover 40 can be reduced, and the stress concentration generated by the isolation cover 40 can be reduced.

As shown in fig. 8 and 9, in some embodiments, the bottom wall portion 41 of the cage 40 is a flat plate structure,

referring to fig. 8 to 10, in order to improve the stability of the spacing connection between the connecting member 60 and the shielding case 40, in some embodiments, the side wall portion 42 includes a position-limiting portion 421, the position-limiting portion 421 is disposed close to the bottom wall portion 41, the connector 60 includes a body portion 62, the body portion 62 includes at least two first fitting portions 621, the first fitting portions 621 are arranged along a circumferential direction of the connector 60, a maximum dimension of outer surfaces of the at least two first fitting portions 621 is greater than a caliber of an inner surface of the position-limiting portion 421, the first fitting portions 621 are in interference fit with the inner surface of the position-limiting portion 421, and it should be noted that the maximum dimension of the outer surfaces of the at least two first fitting portions 621 refers to a maximum dimension of a circular area formed by passing through a center of the connector 60 and a vertex of the outer surface of the at least two first fitting portions 621 on a cross section obtained by cutting the connector 60 in a direction perpendicular to an axial direction of the connector 60. In specific implementation, the body portion 62 includes four first fitting portions 621 arranged along the circumferential direction of the connecting element 60, and the outer surfaces of the four first fitting portions 621 are in interference fit with the inner surface of the limiting portion 421.

Based on this, when the connecting element 60 is assembled with the insulating cover 40, the connecting element 60 can enter the insulating cover 40 from the opening of the insulating cover 40 until one end of the connecting element 60 is in limit contact with the bottom wall portion 41, and at this time, part of the outer surface of the first matching portion 621 is in interference fit with the limit portion 421 of the side wall portion 42, so as to facilitate the assembling of the connecting element 60 with the insulating cover 40, in some embodiments, as shown in fig. 8, the side wall portion 42 of the insulating cover 40 further includes a separating portion 422 and a transition portion 423 that are connected with each other, the transition portion 423 is located between the separating portion 422 and the limit portion 421 along the axial direction of the positioning shaft 50, the caliber of the inner surface of the separating portion 422 is larger than that of the inner surface of the limit portion 421, and the caliber of the inner surface of the transition portion 423 is reduced from the separating portion 422 to the extending direction of the limit portion 421. Optionally, the connector 60 further includes a rib 64, the rib 64 is located on the inner surface side of the body portion 62, and the rib 64 is fixedly connected to the inner surface of the first fitting portion 621.

Further, as shown in fig. 8, when the connecting member 60 includes the mounting portion 61, the mounting portion 61 contacts with the bottom wall portion 41 of the shielding case 40, and the axial dimension of the mounting portion 61 is larger than the axial dimension of the body portion 62 along the axial direction of the connecting member 60, by the above arrangement, on one hand, the depth of the positioning shaft 50 embedded in the connecting member 60 can be satisfied, and on the other hand, by setting the axial dimension of the body portion 62 to be smaller, the contact area between the body portion 62 and the limiting portion 421 can be reduced, and the assembling process of the connecting member 60 and the shielding case 40 can be simplified.

In order to further improve the connection stability of the connection element 60 and the isolation cover 40 and prevent the connection element 60 from rotating along the axial direction, in some embodiments, as shown in fig. 9 and 10, the connection element 60 further includes at least two second matching portions 63, each second matching portion 63 includes a recess 622 and an abutting portion 631 fixedly connected to each other, the abutting portion 631 protrudes from the recess 622, the recess 622 is located in the main body 62 and arranged along the circumferential direction of the connection element 60, at least one recess 622 is located between two adjacent first matching portions 621, as shown in fig. 9, one recess 622 is located between two adjacent first matching portions 621, in a specific implementation, the main body 62 includes four first matching portions 621 arranged along the circumferential direction of the connection element 60, the connection element 60 includes four second matching portions 63, one second matching portion 63 is located between two adjacent first matching portions 621, and the second matching portions 63 have elastic deformation capability, in the initial state, the maximum dimension of the at least two second engagement portions 63 is larger than the diameter of the inner surface of the stopper portion 421, the second engagement portions 63 contact the inner surface of the side wall portion 42, and the at least two second engagement portions 63 are compressed and clamped between the inner surfaces of the side wall portion 42. Through the above arrangement, the second matching part 63 and the first matching part 621 are matched with each other, so that the stable limit connection between the connecting piece 60 and the isolation cover 40 is realized. Alternatively, in order to provide the second fitting portion 63 with elastic deformability, the wall thickness of the recess 622 is 0.3 mm to 2 mm.

In some embodiments, the connecting member 60 is made of plastic, i.e. the connecting member 60 is an injection molded component, alternatively, the connecting member 60 is made of plastic with high elastic flexibility, for example, the connecting member 60 may be made of, but not limited to, polyphenylene sulfide (PPS) or Polyphthalamide (PPA), and the connecting member 60 and the mounting section 51 of the positioning shaft 50 are fixedly connected into an integral injection molded structure through an injection molding process. In specific implementation, the mounting portion 61, the reinforcing rib 64, the body portion 62 and the abutting portion 631 of the connector 60 can be integrally injection molded, the positioning shaft 50 can be made of a metal material, the positioning shaft 50 can be used as a metal insert and injection molded with the connector 60 to form an integral structure, and the connection stability of the positioning shaft 50 and the connector 60 is improved. It will be appreciated that the connector 60 may be made of other materials such as metal.

Optionally, the outer circumferential surface of the mounting section 51 may have a knurled structure, which can increase the contact area between the positioning shaft 50 and the connecting member 60, and improve the stability of the connection between the positioning shaft 50 and the connecting member 60 through the injection molding process, and optionally, the outer circumferential surface of the mounting section 51 may also be a smooth curved surface.

Optionally, as shown in fig. 3 and 4, the fluid driving device 1 further includes a bearing 72, the bearing 72 is located between the outer surface of the positioning shaft 50 and the inner surface of the rotor assembly 30 along the radial direction of the connecting member 60, when the connecting member 60 is made of plastic, in order to prevent the bearing 72 from causing abrasion to the connecting member 60 during the operation of the fluid driving device 1, in some embodiments, the fluid driving device 1 further includes a spacer 71, the spacer 71 is located between the bearing 72 and the connecting member 60 along the axial direction of the positioning shaft 50, and the thickness of the spacer 71 is smaller than the spacing distance between the bearing 72 and the connecting member 60. With the above arrangement, on the one hand, wear of the link 60 can be reduced, and on the other hand, by setting the thickness of the spacer 71 smaller than the distance of separation between the bearing 72 and the link 60, the influence on the rotation of the rotor assembly 30 can be reduced.

In summary, according to the fluid driving device 1 provided by the embodiment of the present invention, the fluid driving device includes the positioning shaft 50, the connecting member 60 and the isolation cover 40, the positioning shaft 50 includes the mounting section 51, at least a portion of the mounting section 51 is in limit connection with the connecting member 60, and compared with a case that a deeper groove structure needs to be made on the isolation cover 40 when the positioning shaft 50 is in limit connection with the isolation cover 40, by providing the connecting member 60 in limit connection with the mounting section 51, the depth of making the groove on the isolation cover 40 can be reduced or a groove structure for fixing the positioning shaft 50 on the isolation cover 40 is cancelled, so that stress concentration of the isolation cover 40 is reduced, and a risk of cracking of the isolation cover 40 is reduced; further, the isolation cover 40 comprises a bottom wall portion 41 and a side wall portion 42, and a portion of the circumferential surface of the connecting member 60 is in limit connection with the inner surface of the side wall portion 42 of the isolation cover 40, so that stress at the connection position of the connecting member 60 and the isolation cover 40 can be dispersed, and by the arrangement, the connection stability of the connecting member 60 and the isolation cover 40 can be increased, the risk of cracking of the isolation cover 40 can be reduced, and the popularization and application are facilitated.

It should be noted that: although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will appreciate that various modifications, combinations, or equivalents may be made without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims (12)

1. A fluid driving device comprising a stator assembly, a rotor assembly, and a cage, the fluid driving device having a first chamber and a second chamber, the stator assembly being located in the first chamber, the rotor assembly being located in the second chamber, the cage being located between and separating the first chamber and the second chamber;

the fluid driving device further comprises a positioning shaft and a connecting piece, at least part of the positioning shaft is located on the inner side of the rotor assembly, the connecting piece is located in the second cavity, the positioning shaft comprises an installation section, at least part of the installation section is in limit connection with the connecting piece, the isolation cover comprises a bottom wall portion and a side wall portion protruding out of the bottom wall portion, and at least part of the connecting piece is in limit connection with the side wall portion of the isolation cover.

2. The fluid driving device as defined in claim 1, wherein the bottom wall portion comprises a flat plate structure, the connecting member comprises a mounting portion having a mounting hole, at least a portion of the mounting section is inserted into the mounting hole and the mounting section is in limit connection with the connecting member.

3. The fluid drive device as defined in claim 2, wherein said bottom wall portion is a flat plate structure;

or, end wall portion still includes the recess, the recess certainly dull and stereotyped structure stretches into first chamber follows the axial of location axle, a part of erection segment with connecting piece spacing connection, another part embedding of erection segment the recess just the surface of erection segment with the internal surface interference fit of recess.

4. A fluid driving device according to any one of claims 1 to 3, wherein said side wall portion includes a stopper portion, said stopper portion being adjacent to said bottom wall portion;

the connecting piece comprises a body part, the body part comprises at least two first matching parts, the first matching parts are arranged along the circumferential direction of the connecting piece, and the first matching parts are in interference fit with the inner surface of the limiting part.

5. The fluid driving device as claimed in claim 4, wherein the connecting member further comprises at least two second engaging portions, the second engaging portions comprise a recessed portion and an abutting portion, the abutting portion protrudes from the recessed portion and is fixedly connected with the recessed portion, the recessed portion is located on the main body portion and is arranged along a circumferential direction of the connecting member, and at least one recessed portion is arranged between two adjacent first engaging portions;

the second matching parts have elastic deformation capacity, in an initial state, the maximum size of the second matching parts is larger than the caliber of the inner surface of the limiting part, the second matching parts are in contact with the inner surface of the side wall part, and at least two second matching parts are compressed and clamped on the inner surface of the side wall part.

6. The fluid driving device as claimed in claim 5, wherein said connector further comprises a rib, said rib being located inside said body portion, and said rib being fixedly connected to at least two of said first fitting portions.

7. A fluid driving device as claimed in claim 5 wherein the recess has a wall thickness of from 0.3 mm to 2 mm.

8. The fluid drive device according to any one of claims 5 to 7, wherein the side wall portion further includes a partition portion and a transition portion connected to each other, the transition portion is located between the partition portion and the stopper portion in an axial direction of the positioning shaft, an inner surface of the partition portion has a larger diameter than an inner surface of the stopper portion, and an inner surface of the transition portion decreases in diameter in an extending direction from the partition portion to the stopper portion.

9. The fluid driving device as claimed in any one of claims 1 to 3 and 5 to 7, wherein the connecting member is an injection molded part and is integrally molded with the mounting section of the positioning shaft.

10. The fluid drive device of claim 4 wherein the connector is an injection molded part and is of one-piece injection molded construction with the mounting section of the positioning shaft.

11. The fluid actuated device of claim 8, wherein the connector is an injection molded part and is integrally molded with the mounting section of the positioning shaft.

12. The fluid drive device as defined in claim 9, wherein said positioning shaft is made of metal, and an outer peripheral surface of said mounting section has a knurled structure;

the fluid driving device further comprises a gasket and a bearing, the bearing is located between the outer surface of the positioning shaft and the inner surface of the rotor assembly along the radial direction of the connecting piece, the gasket is located between the bearing and the connecting piece along the axial direction of the positioning shaft, and the thickness of the gasket is smaller than the spacing distance between the bearing and the connecting piece.

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