A motor rotor shaft

Abstract

The application relates to the technical field of rotor shafts, in particular to a motor rotor shaft which comprises a rotor shaft body, a core arranged at the middle part of the rotor shaft body, two mounting blocks arranged at the two sides of the core in sequence on the side surface of the rotor shaft body, a first connecting block arranged at the side surface of the mounting block on the right side of the rotor shaft body and uniformly distributed, a connecting hole arranged in the first connecting block, and a flow groove arranged in the rotor shaft body and corresponding to the position of the connecting hole. In the application, the cooling medium outside the rotor shaft body can flow in the connecting part of the rotor shaft body and the core, heat dissipation work of the connecting part of the rotor shaft body and the core is facilitated, the faster the rotating speed of the rotor shaft body, the greater the centrifugal force, the faster the flow speed of the cooling medium in the flow groove, the better the heat dissipation effect, and the problem that the faster the rotating speed of the rotor shaft body, the higher the heat generated is solved.

Description

Technical Field

[0001] This invention relates to the field of rotor shaft technology, and more specifically to a motor rotor shaft. Background Technology

[0002] As an important component of a motor, the motor rotor shaft acts as a bridge for the electromechanical energy conversion between the motor and the equipment. It can support rotating parts and transmit torque, and it can also determine the position of rotating parts relative to the stator.

[0003] During motor operation, the eddy current effect on the rotor surface causes the rotor and shaft to heat up more than the stator and housing. In addition, the rotor surface is often covered with a carbon fiber sheath structure. Due to the physical properties of carbon fiber itself, the heat dissipation performance of the rotor surface is very poor, which further exacerbates the heat generation of the rotor and shaft.

[0004] Currently, most motor cooling methods employ water-cooled housings or external fan structures, along with internal cooling media. These methods effectively cool the motor casing and stator. However, because this cooling method works from the outside of the motor to the inside, it results in slow heat dissipation for the rotor shaft and rotor connection, which are located in the middle of the motor. Since the rotor shaft and rotor connection generate heat rapidly during rotation, the slow cooling effect is minimal for the severely overheated rotor shaft and rotor connection. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a motor rotor shaft that can effectively solve the problem of high temperature at the connection between the rotor shaft and the rotor during use.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a motor rotor shaft, including a rotor shaft body and an iron core disposed in the middle of the rotor shaft body, and two mounting blocks disposed sequentially on the side of the rotor shaft body near the two sides of the iron core. The mounting block on the right side of the rotor shaft body is provided with a uniformly distributed first connecting block. The first connecting block has a connecting hole inside. The iron core has a flow groove inside corresponding to the position of the connecting hole. When the rotor shaft body rotates, the connecting hole guides the cooling medium outside the rotor shaft body to the inside of the first connecting block.

[0008] The auxiliary components installed inside the flow channel are used to reduce the damage to the sides of the flow channel caused by cavitation when the cooling medium flows inside the flow channel.

[0009] Furthermore, a protective film is provided on the inner surface of the flow channel.

[0010] Furthermore, the auxiliary component includes two elastic sheets symmetrically arranged on the inner side of the flow channel, and through holes uniformly opened on the side of the elastic sheets. The center portions of the two elastic sheets are pressed against each other, one end of the elastic sheet is fixedly connected to the inner side of the flow channel, and the elastic sheet is arc-shaped.

[0011] Furthermore, uniformly distributed protrusions are fixedly connected to the left side of the outer surface of the elastic sheet away from the central axis of the elastic sheet.

[0012] Furthermore, the inner radial direction of the connecting hole near the right side of the iron core decreases sequentially towards the iron core, while the inner radial direction of the connecting hole near the left side of the iron core increases sequentially towards the iron core, and the inner radial direction of the flow groove at the left edge of the flow groove gradually increases towards the left connecting hole of the iron core.

[0013] Furthermore, there are at least three first connecting blocks and flow channels, and the positions of the first connecting blocks and flow channels correspond sequentially.

[0014] Furthermore, a connecting groove is provided through the side of the first connecting block near the connecting hole, and two second connecting blocks are symmetrically connected to the two sides of the connecting groove. The side of the second connecting block near the connecting hole is connected to a movable block by an elastic column.

[0015] Furthermore, one of the movable blocks has a top rod connected to its side away from the second connecting block and near the center.

[0016] Furthermore, the side of the second connecting block away from the connecting hole is arc-shaped at its center.

[0017] Furthermore, each of the two mounting blocks has a drainage groove on its side near the first connecting block, and the drainage groove is spiral-shaped.

[0018] The technical solution provided by this invention has the following advantages compared with known public technologies:

[0019] 1. During use, the present invention allows the cooling medium on the outside of the rotor shaft body to flow at the connection between the rotor shaft body and the iron core, which facilitates the heat dissipation of the connection between the rotor shaft body and the iron core. At the same time, the faster the rotor shaft body rotates, the greater the centrifugal force generated, the faster the cooling medium flows in the flow groove, and the better the heat dissipation effect, thus addressing the problem that the faster the rotor shaft body rotates, the higher the heat generated.

[0020] 2. By setting the inner radial direction of the connecting hole near the right side of the iron core to decrease sequentially towards the iron core, and the inner radial direction of the connecting hole near the left side of the iron core to increase sequentially towards the iron core, the flow speed of the cooling medium inside the flow channel is accelerated, further improving the overall heat dissipation effect.

[0021] 3. By setting a protective film to protect the sides of the flow channel, cavitation can be prevented when the cooling medium flows inside the flow channel, thus avoiding the problem of affecting the normal operation of the flow channel. Cavitation is a phenomenon in which cave-like corrosion damage occurs on the metal surface in contact with the fluid under conditions of high-speed flow and pressure change. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0023] Figure 1 This is a complete structural schematic diagram of the present invention;

[0024] Figure 2 This is a front sectional view of the present invention;

[0025] Figure 3 This is a front cross-sectional view of the present invention;

[0026] Figure 4 This is a schematic diagram of the connection between the first connecting block and the movable block of the present invention;

[0027] Figure 5 For the present invention Figure 3 Enlarged view of point A in the middle;

[0028] Figure 6 For the present invention Figure 3 Enlarged view at point B in the middle;

[0029] Figure 7 This is a schematic diagram of the connection between the protective film and the elastic sheet of the present invention;

[0030] Figure 8 This is a cross-sectional view of the connection between the first connecting block and the movable block of the present invention.

[0031] The labels in the diagram represent: 1. Rotor shaft body; 2. Iron core; 3. Mounting block; 4. First connecting block; 5. Flow groove; 6. Connecting hole; 7. Protective film; 8. Elastic sheet; 9. Through hole; 10. Protrusion; 11. Second connecting block; 12. Movable block; 13. Elastic column; 14. Push rod; 15. Connecting groove; 16. Drainage groove. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] The present invention will be further described below with reference to embodiments.

[0034] Example: Refer to Figures 1 to 8 An electric motor rotor shaft includes a rotor shaft body 1 and an iron core 2 disposed in the middle of the rotor shaft body 1. It also includes two mounting blocks 3 disposed sequentially on the side of the rotor shaft body 1 near the iron core 2. The mounting block 3 on the right side of the rotor shaft body 1 has a uniformly distributed first connecting block 4. The mounting block 3 has a connecting hole 6 inside. The connecting groove 15 formed through the side of the first connecting block 4 communicates with the connecting hole 6. The iron core 2 has a flow groove 5 at a position corresponding to the connecting hole 6. The connecting hole 6 communicates with the flow groove 5. When the rotor shaft body 1 rotates, the connecting hole 6 guides the cooling medium outside the rotor shaft body 1 to the inside of the first connecting block 4.

[0035] A connecting groove 15 is provided through the side of the first connecting block 4 near the connecting hole 6. Two second connecting blocks 11 are symmetrically connected to the two sides of the connecting groove 15. A movable block 12 is connected to the side of the second connecting block 11 near the connecting hole 6 through an elastic column 13. A top rod 14 is connected to the side of one of the movable blocks 12 away from the second connecting block 11 near the middle.

[0036] When the rotor shaft body 1 rotates, it drives the mounting block 3 and the first connecting block 4 to rotate. When the rotor shaft body 1 drives the mounting block 3 to rotate clockwise, that is, when the mounting block 3 drives the first connecting block 4 to rotate clockwise, the cooling medium outside the first connecting block 4, under the action of the rotational force, squeezes the movable block 12 located on one side of the rotating surface inside the connecting groove 15. The squeezing force causes the movable block 12 to overcome the elastic force of the elastic column 13 and move away from the second connecting block 11. A gap is generated between the movable block 12 and the second connecting block 11, and the cooling medium enters the interior of the connecting groove 15 through the gap. At the same time, when the movable block 12 moves away from the second connecting block 11, the movable block 12... The moving push rod 14 moves toward the movable block 12 which is not located on the rotating surface, and squeezes the movable block 12 which is not located on the rotating surface, so that it fits with the second connecting block 11 which is not located on the rotating surface. This prevents the cooling medium entering the connecting groove 15 from flowing out through the second connecting block 11 and the movable block 12 which are not located on the rotating surface, thus affecting the amount of cooling medium entering the connecting groove 15. Similarly, when the rotor shaft body 1 drives the mounting block 3 to rotate counterclockwise, a gap is generated between one set of second connecting blocks 11 and the movable block 12, and the other set of second connecting blocks 11 and the movable block 12 are in a closed state. That is, the cooling medium can enter the interior of the connecting groove 15 in both forward and reverse rotation of the rotor shaft body 1.

[0037] Both mounting blocks 3 have a flow channel 16 on their sides near the first connecting block 4. The flow channel 16 is spiral in shape.

[0038] Meanwhile, as the thread diameter of the drainage groove 16 on the right side of the rotor shaft body 1 gradually increases towards the first connecting block 4, when the mounting block 3 rotates, due to centrifugal force, the drainage groove 16 on the right side of the rotor shaft body 1 guides the cooling medium outside the drainage groove 16 to a position close to the first connecting block 4, further facilitating the entry of the cooling medium outside the rotor shaft body 1 into the interior of the connecting groove 15. After the cooling medium enters the connecting groove 15, it then enters the interior of the flow groove 5 through the connecting hole 6. As the thread diameter of the drainage groove 16 on the left side of the rotor shaft body 1 gradually increases away from the connecting hole 6, when the mounting block 3 rotates, due to centrifugal force, the drainage groove 16 on the left side of the rotor shaft body 1 guides the cooling medium inside the flow groove 5 and the connecting hole 6 on the left side of the rotor shaft body 1. The liquid is diverted to the outside of the rotor shaft body 1. As the rotor shaft body 1 rotates, the liquid outside the rotor shaft body 1 enters the interior of the flow channel 5 through the connecting hole 6 on the right side of the rotor shaft body 1, and then exits through the connecting hole 6 on the left side of the rotor shaft body 1. This cycle repeats, and the cooling medium flows inside the flow channel 5. The flow channel 5 is located near the connection between the rotor shaft body 1 and the iron core 2. When the cooling medium flows inside the flow channel 5, it can carry away the heat from the connection between the rotor shaft body 1 and the iron core 2, thus facilitating the heat dissipation of the connection between the rotor shaft body 1 and the iron core 2. At the same time, the faster the rotor shaft body 1 rotates, the greater the centrifugal force generated, and the faster the flow speed of the cooling medium inside the flow channel 5, resulting in better heat dissipation and addressing the issue that the faster the rotor shaft body 1 rotates, the higher the heat generated.

[0039] Meanwhile, by setting the inner radial direction of the connecting hole 6 near the right side of the iron core 2 to decrease sequentially towards the iron core 2, and the inner radial direction of the connecting hole 6 near the left side of the iron core 2 to increase sequentially towards the iron core 2, the flow speed of the cooling medium in the flow groove 5 is accelerated, further improving the overall heat dissipation effect.

[0040] The inner radial direction of the connecting hole 6 near the right side of the iron core 2 decreases sequentially towards the iron core 2, while the inner radial direction of the connecting hole 6 near the left side of the iron core 2 increases sequentially towards the iron core 2. The inner radial direction of the flow groove 5 at the left edge gradually increases towards the left side connecting hole 6 of the iron core 2.

[0041] A protective film 7 is provided on the inner side of the flow channel 5;

[0042] At the same time, by setting a protective film 7 to protect the side of the flow channel 5, the problem of cavitation phenomenon occurring when the cooling medium flows inside the flow channel 5 is avoided, which would affect the normal operation of the flow channel 5. Cavitation is a phenomenon of cave-like corrosion damage that occurs on the metal surface in contact with the fluid under conditions of high-speed flow and pressure change.

[0043] By setting the inner radial direction of the connecting hole 6 near the left side of the iron core 2 to gradually increase towards the iron core 2, and the inner radial direction of the flow channel 5 near the left side connecting hole 6 of the iron core 2 to gradually increase towards the left side edge, the flow rate and pressure of the cooling medium decrease when it passes through the left side edge and the left side connecting hole 6 of the flow channel 5. This avoids the problem of excessive pressure change when the cooling medium is discharged through the left side connecting hole 6, which would increase the possibility of cavitation. This extends the service life of the protective film 7 on the surface of the flow channel 5.

[0044] The auxiliary component is installed inside the flow channel 5 to reduce the damage to the side of the flow channel 5 caused by cavitation when the cooling medium flows inside the flow channel 5. The auxiliary component includes two elastic plates 8 symmetrically arranged on the inner side of the flow channel 5 and through holes 9 uniformly opened through the side of the elastic plates 8. The center of the two elastic plates 8 is pressed against each other. One end of the elastic plate 8 is fixedly connected to the inner side of the flow channel 5, and the elastic plate 8 is arc-shaped.

[0045] Furthermore, during cavitation, when the pressure of the liquid at the contact point with the solid surface is lower than its vapor pressure, bubbles will form near the solid surface. Additionally, dissolved gases in the liquid may also precipitate and form bubbles. Subsequently, when the bubbles flow to a point where the liquid pressure exceeds the bubble pressure, the bubbles collapse, generating tremendous impact force and high temperature at the moment of collapse. The solid surface undergoes repeated impacts from this force, leading to material fatigue and spalling, resulting in small pits on the surface, eventually developing into a sponge-like structure. By setting up the elastic plate 8, when bubbles are generated in the cooling medium flowing inside the flow channel 5, and the cooling medium is pulled to the position of the elastic plate 8, the cooling medium... The cooling medium enters the interior of the elastic plate 8 through the gap between the elastic plate 8 and the flow channel 5. As the amount of cooling medium inside the flow channel 5 increases, the cooling medium squeezes the elastic plate 8. The squeezing force causes the two elastic plates 8 to undergo elastic deformation in the direction away from each other. At the same time, when the cooling medium squeezes the elastic plate 8, the air bubbles inside the cooling medium are squeezed and collapsed. When the cooling medium squeezes the elastic plate 8, it causes the cooling medium inside the elastic plate 8 to move towards the air bubbles through the through hole 9. This can replenish the space created by the collapse of the air bubbles in time, thereby further reducing the damage of cavitation to the side of the flow channel 5 and extending the service life of the flow channel 5.

[0046] Reference Figure 5 The outer side of the elastic sheet 8 is fixedly connected with evenly distributed protrusions 10 on the left side away from the central axis of the elastic sheet 8, which facilitates the bursting of air bubbles inside the cooling medium.

[0047] Reference Figures 1 to 3There are at least three first connecting blocks 4 and flow channels 5, and the positions of the first connecting blocks 4 and flow channels 5 correspond sequentially. By setting at least three first connecting blocks 4 and flow channels 5, an incremental cooling channel is created, which further improves the cooling effect of the main body.

[0048] Reference Figure 5 The second connecting block 11 has an arc-shaped side away from the connecting hole 6, which further facilitates the entry of the cooling medium into the interior of the connecting groove 15.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A motor rotor shaft, comprising a rotor shaft body (1) and an iron core (2) disposed in the middle of the rotor shaft body (1), characterized in that, Also includes: Two mounting blocks (3) are arranged sequentially on the side of the rotor shaft body (1) and located on both sides of the iron core (2). The mounting block (3) located on the right side of the rotor shaft body (1) has a uniformly distributed first connecting block (4). The mounting block (3) has a connecting hole (6) inside, and the iron core (2) has a flow groove (5) at a position corresponding to the connecting hole (6) inside, and the connecting hole (6) is connected to the flow groove (5); A connecting groove (15) is provided through the side of the first connecting block (4) near the connecting hole (6). The connecting groove (15) communicates with the connecting hole (6). Two second connecting blocks (11) are symmetrically connected to the two sides of the connecting groove (15). The side of the second connecting block (11) near the connecting hole (6) is connected to a movable block (12) through an elastic column (13). When the rotor shaft body (1) rotates, the cooling medium causes the movable block (12) to overcome the elastic force of the elastic column (13) and generate displacement under the action of the rotation force, thereby forming an inlet gap between the movable block (12) and the second connecting block (11), so that the cooling medium enters the connecting groove (15) and is guided to the interior of the flow groove (5) through the connecting hole (6). The auxiliary component installed inside the flow channel (5) is used to reduce the damage to the side of the flow channel (5) caused by cavitation when the cooling medium flows inside the flow channel (5).

2. The motor rotor shaft according to claim 1, characterized in that, The inner surface of the flow channel (5) is provided with a protective film (7).

3. A motor rotor shaft according to claim 2, characterized in that, The auxiliary component includes two elastic plates (8) symmetrically arranged on the inner side of the flow groove (5) and through holes (9) uniformly opened on the side of the elastic plates (8). The center of the two elastic plates (8) is pressed against each other. One end of the elastic plate (8) is fixedly connected to the inner side of the flow groove (5), and the elastic plate (8) is arc-shaped.

4. A motor rotor shaft according to claim 3, characterized in that, The outer side of the elastic sheet (8) is fixedly connected with uniformly distributed protrusions (10) on the left side away from the central axis of the elastic sheet (8).

5. A motor rotor shaft according to claim 1, characterized in that, The inner radial direction of the connecting hole (6) near the right side of the iron core (2) decreases sequentially towards the iron core (2), while the inner radial direction of the connecting hole (6) near the left side of the iron core (2) increases sequentially towards the iron core (2). The inner radial direction of the flow groove (5) at the left edge position gradually increases towards the left connecting hole (6) of the iron core (2).

6. A motor rotor shaft according to claim 1, characterized in that, The number of the first connecting block (4) and the flow channel (5) is at least three, and the positions of the first connecting block (4) and the flow channel (5) correspond sequentially.

7. A motor rotor shaft according to claim 1, characterized in that, One of the movable blocks (12) is connected to a top rod (14) on the side away from the second connecting block (11) near the center.

8. A motor rotor shaft according to claim 1, characterized in that, The second connecting block (11) has an arc-shaped middle part on the side away from the connecting hole (6).

9. A motor rotor shaft according to claim 1, characterized in that, Both mounting blocks (3) have drainage grooves (16) on their sides near the first connecting block (4), and the drainage grooves (16) are spiral-shaped.

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