Stator cooling structure and electrospindle

Abstract

The application provides a stator cooling structure and an electric spindle, the stator cooling structure comprising: a sleeve, which is sleeved on the outer periphery of the motor stator, and is provided with an inlet flow channel and an outlet flow channel, the inlet flow channel is arranged between the outer peripheral wall and the inner peripheral wall of the sleeve, and the inlet flow channel can introduce cooling fluid into the inlet flow channel from the outside of the sleeve, the outlet flow channel is arranged between the outer peripheral wall and the inner peripheral wall of the sleeve, and the outlet flow channel can guide the cooling fluid in the inside of the sleeve to the outside, and an annular flow channel is further arranged between the inner peripheral wall and the outer peripheral wall of the sleeve, one end of the annular flow channel is communicated with the inlet flow channel, and the other end is communicated with the outlet flow channel. According to the application, the situation that the cooling efficiency is reduced due to the insufficient cooperation between the outer diameter of the cooling sleeve and the shell caused by the cooling flow channel arranged outside the cooling sleeve is avoided, and the cooling effect of the motor stator is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric spindles, in particular to a stator cooling structure and electric spindle. BACKGROUND

[0002] During the machining process of the electric spindle, the motor stator coil generates a lot of heat. When the temperature of the motor stator rises too high, it seriously affects the performance of the motor stator, reduces its power and torque, and the heat generated is transferred to the rest of the spindle parts, causing the spindle parts to be deformed by heat, affecting the machining accuracy of the spindle. The common motor stator cooling channel of the spindle adopts a spiral type or a rectangular groove structure on the surface of the cooling sleeve. However, the cooling path is short, the cooling efficiency is low, and the machining difficulty of the cooling structure on the parts is high.

[0003] The motor stator cooling scheme is commonly seen in patent schemes. According to statistical analysis, the cooling structure can be divided into the following forms:

[0004] The first type is to set a spiral groove structure outside the cooling sleeve, and the cooling channel is formed by the cavity surrounded by the groove and the shell. For example, patent number CN109865848A. This structure has a thin shell wall. When the cooling sleeve and the shell do not cooperate, the cooling liquid will flow along the gap between the cooling sleeve and the shell, resulting in poor cooling effect and high machining difficulty of the spiral groove.

[0005] The second type is to set parallel water channels along the axial direction, and the complete cooling water channel is formed by connecting the parallel water channels. This structure has the same problem as the above scheme. During the cooling liquid flow process, when the cooling sleeve outer diameter does not cooperate, the cooling liquid may not move in one direction along the cooling flow channel, resulting in reduced cooling efficiency and greater machining difficulty.

[0006] Since the existing electric spindle stator cooling scheme adopts the cooling sleeve method, but the cooling sleeve outer diameter and the shell do not cooperate, resulting in reduced cooling efficiency, the present application designs a stator cooling structure and electric spindle. SUMMARY

[0007] Therefore, the technical problem to be solved by the present application is to overcome the defect that the existing electric spindle stator adopts the cooling sleeve method, which results in reduced cooling efficiency when the cooling sleeve outer diameter and the shell do not cooperate, thereby providing a stator cooling structure and electric spindle.

[0008] In order to solve the above problems, the present application provides a stator cooling structure, which comprises:

[0009] A sleeve is sleeved on the outer periphery of the motor stator, and an inlet flow channel and an outlet flow channel are arranged on the sleeve. The inlet flow channel is arranged at a position between the outer peripheral wall and the inner peripheral wall of the sleeve, and the inlet flow channel can introduce cooling fluid into the inlet flow channel from the outside of the sleeve. The outlet flow channel is located at a position between the outer peripheral wall and the inner peripheral wall of the sleeve, and the outlet flow channel can guide the cooling fluid inside the sleeve out. An annular flow channel is further arranged between the inner peripheral wall and the outer peripheral wall of the sleeve. One end of the annular flow channel is in communication with the inlet flow channel, and the other end is in communication with the outlet flow channel.

[0010] In some embodiments, the inlet flow channel extends along the axial direction of the sleeve, and a cooling inlet is arranged at one axial end of the sleeve. One end of the cooling inlet is in communication with the inlet flow channel, and the other end is in communication with the outside of the sleeve. The outlet flow channel also extends along the axial direction of the sleeve, and a cooling outlet is arranged at the other axial end of the sleeve. One end of the cooling outlet is in communication with the outlet flow channel, and the other end extends to the outside of the sleeve.

[0011] In some embodiments, the sleeve comprises a sleeve body and a flange plate connected to the axial one side end surface of the sleeve body. The outer diameter of the flange plate is greater than the outer diameter of the sleeve body. The cooling outlet is arranged on the flange plate and extends in the radial direction. The radial inner end of the cooling outlet is in communication with the outlet flow channel, and the radial outer end extends to the outer peripheral surface of the flange plate.

[0012] In some embodiments, the inlet flow channel and the outlet flow channel are arranged in a spaced manner to form an opening of the annular flow channel. The opening is formed at a position where the liquid inlet and the liquid outlet of the annular flow channel are not in communication.

[0013] In some embodiments, the annular flow channel comprises a first straight channel, a second straight channel, and at least one third straight channel. One end of the first straight channel extends to the outer peripheral wall of the sleeve, and the other end extends to a position between the inner wall and the outer wall of the sleeve. The inlet flow channel is in communication with the first straight channel. One end of the second straight channel is in communication with the outlet flow channel, and the other end extends to the outer peripheral wall of the sleeve. The at least one third straight channel can communicate the first straight channel and the second straight channel.

[0014] In some embodiments, the first straight channel, the at least one third straight channel, and the second straight channel are sequentially arranged in communication along the circumferential direction of the sleeve. The first straight channel and the second straight channel are not in communication. Fluid sequentially passes through the first straight channel, the at least one third straight channel, and the second straight channel, or fluid sequentially passes through the second straight channel, the at least one third straight channel, and the first straight channel.

[0015] In some embodiments, the third straight passage comprises a third straight passage one, a third straight passage two, a third straight passage three and a third straight passage four, one end of the third straight passage one is communicated with the second straight passage, the other end of the third straight passage one extends to the outer peripheral wall of the shaft sleeve, one end of the third straight passage two is communicated with the third straight passage one, the other end of the third straight passage two extends to the outer peripheral wall of the shaft sleeve, one end of the third straight passage three is communicated with the third straight passage two, the other end of the third straight passage three extends to the outer peripheral wall of the shaft sleeve, one end of the third straight passage four is communicated with the third straight passage three, the other end of the third straight passage four extends to the outer peripheral wall of the shaft sleeve, the other end of the first straight passage is communicated with the third straight passage four; so that the first straight passage, the third straight passage four, the third straight passage three, the third straight passage two, the third straight passage one and the second straight passage are sequentially communicated along the circumference of the shaft sleeve.

[0016] The fluid sequentially flows through the first straight passage, the third straight passage four, the third straight passage three, the third straight passage two, the third straight passage one and the second straight passage, or the fluid sequentially flows through the second straight passage, the third straight passage one, the third straight passage two, the third straight passage three, the third straight passage four and the first straight passage.

[0017] In some embodiments, the ring-shaped flow passages are multiple, and the fluid sequentially flows through the inflow passage, the upstream ring-shaped flow passage, the outflow passage, the downstream ring-shaped flow passage, the inflow passage, and the outflow passage to form a series communication structure.

[0018] In some embodiments, a first plug is arranged in the inflow passage, the first plug is arranged between two adjacent ring-shaped flow passages, and the first plug is arranged between the liquid inlet of the ring-shaped flow passage upstream in the fluid flow direction and the liquid outlet of the ring-shaped flow passage downstream in the fluid flow direction.

[0019] A second plug is arranged in the outflow passage, the second plug is arranged between two adjacent ring-shaped flow passages, and the second plug is arranged between the liquid inlet of the ring-shaped flow passage upstream in the fluid flow direction and the liquid outlet of the ring-shaped flow passage downstream in the fluid flow direction.

[0020] In some embodiments, further comprising a shell, the shell is sleeved on the outer periphery of the shaft sleeve, and a sealing member is arranged on at least one of the inner peripheral wall of the shell, the outer peripheral wall of the shaft sleeve and the position between the shell and the shaft sleeve.

[0021] In some embodiments, the sealing member includes a first sealing member arranged between an axial end of the shaft sleeve and the annular flow channel closest to the axial end, and a second sealing member arranged between an axial other end of the shaft sleeve and the annular flow channel closest to the axial other end.

[0022] The application also provides an electric spindle comprising the stator cooling structure according to any one of the preceding embodiments, and further comprising a motor rotor and a rotating shaft, the motor rotor being sleeved on the outer periphery of the rotating shaft, the motor stator being located on the outer periphery of the motor rotor, and the shaft sleeve being sleeved on the outer periphery of the motor stator.

[0023] The stator cooling structure and the electric spindle provided by the application have the following beneficial effects:

[0024] The application can make the cooling fluid enter the solid interior between the inner wall and the outer wall of the shaft sleeve of the motor stator through the inlet flow channel, enhance the heat exchange area with the motor stator in the circumferential direction through the annular flow channel, and then flow out from the outlet flow channel, effectively avoiding the cooling flow channel opened on the outside of the cooling sleeve, avoiding the situation that the cooling efficiency is reduced due to the insufficient cooperation relationship between the outer diameter of the cooling sleeve and the shell when the cooling flow channel is opened on the outside of the cooling sleeve, thereby effectively improving the cooling effect on the motor stator, and greatly enhancing the heat exchange area with the motor stator in the circumferential direction through the annular flow channel, improving the cooling effect. The cooling fluid of the application flows uniformly in the shaft sleeve (the solid interior between the inner wall and the outer wall), ensures good cooling effect of the spindle, reduces the difficulty and cost of part processing, avoids a large number of deep hole processing and other complex structure design on the shaft sleeve, effectively reduces the temperature rise of the spindle motor during operation, and prolongs the service life of the spindle. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a longitudinal sectional view of the electric spindle with the stator cooling structure of the application;

[0026] Figure 2 is a perspective view of the stator cooling structure (shaft sleeve) of the application;

[0027] Figure 3 is a schematic view of the cooling flow channel inside the stator cooling structure (shaft sleeve) of the application;

[0028] Figure 4 is a longitudinal sectional view of the stator cooling structure (shaft sleeve) of the application and a cooling outlet structure view;

[0029] Figure 5 is a structure view of the radial section (annular flow channel) of the stator cooling structure (shaft sleeve) of the application.

[0030] Reference signs are indicated as:

[0031] 1, shaft sleeve; 101, shaft sleeve body; 102, flange; 2, motor stator; 3, inlet channel; 4, outlet channel; 5, annular channel; 51, first straight channel; 52, second straight channel; 53, third straight channel; 531, first third straight channel; 532, second third straight channel; 533, third third straight channel; 534, fourth third straight channel; 61, cooling inlet; 62, cooling outlet; 71, first plug; 72, second plug; 8, shell; 9, sealing element; 91, first sealing element; 92, second sealing element; 10, motor rotor; 11, rotating shaft; 12, front bearing seat; 13, positioning sleeve; 14, pipeline disc; 15, screw hole. DETAILED DESCRIPTION

[0032] As Figures 1-5 indicated, the present application provides a stator cooling structure, which comprises:

[0033] A shaft sleeve 1 is sleeved on the outer periphery of the motor stator 2, and the shaft sleeve 1 is provided with an inlet channel 3 and an outlet channel 4, the inlet channel 3 is arranged at the position between the outer peripheral wall and the inner peripheral wall of the shaft sleeve 1, and the inlet channel 3 can introduce cooling fluid into the inlet channel 3 from the outside of the shaft sleeve 1, the outlet channel 4 is arranged at the position between the outer peripheral wall and the inner peripheral wall of the shaft sleeve 1, and the outlet channel 4 can guide the cooling fluid inside the shaft sleeve 1 to flow out, and an annular channel 5 is further arranged between the inner wall and the outer wall of the shaft sleeve 1, one end of the annular channel 5 is communicated with the inlet channel 3, and the other end is communicated with the outlet channel 4.

[0034] The present application can make the cooling fluid enter the solid inside between the inner wall and the outer wall of the shaft sleeve through the inlet channel arranged between the inner wall and the outer wall of the shaft sleeve on the outer periphery of the motor stator, and then enhance the heat exchange area with the motor stator in the circumferential direction through the annular channel, and then flow out from the outlet channel, which effectively avoids the cooling channel opened outside the cooling sleeve, avoids the insufficient cooperation relationship between the outer diameter of the cooling sleeve and the shell when the cooling channel is opened outside the cooling sleeve, and reduces the cooling efficiency, thereby effectively improving the cooling effect of the motor stator, and the present application greatly enhances the heat exchange area with the motor stator in the circumferential direction through the arrangement of the annular channel, and improves the cooling effect; the cooling liquid of the present application uniformly flows in the shaft sleeve (the solid inside between the inner wall and the outer wall), which guarantees the good cooling effect of the main shaft, reduces the machining difficulty and cost of parts, avoids the large number of deep hole machining and other complex structure design on the shaft sleeve, effectively reduces the temperature rise of the main shaft motor in the running process, and improves the service life of the main shaft.

[0035] In some embodiments, the inlet flow channel 3 extends along the axial direction of the shaft sleeve 1, and a cooling inlet 61 is formed at one axial end of the shaft sleeve 1, with one end of the cooling inlet 61 communicating with the inlet flow channel 3 and the other end communicating with the outside of the shaft sleeve 1; the outlet flow channel 4 also extends along the axial direction of the shaft sleeve 1, and a cooling outlet 62 is formed at the other axial end of the shaft sleeve 1, with one end of the cooling outlet 62 communicating with the outlet flow channel 4 and the other end extending to the outside of the shaft sleeve 1. This is the preferred structural form of the inlet flow channel and the outlet flow channel of the present application, i.e. both the inlet flow channel and the outlet flow channel extend along the axial direction of the shaft sleeve, a cooling inlet is formed at one axial end to communicate with the inlet flow channel to introduce cooling fluid into the inlet flow channel, and a cooling outlet is formed at the other axial end to guide the fluid in the outlet flow channel out of the shaft sleeve.

[0036] The shaft sleeve of the present application is provided with two cooling channels in the axial direction, which communicate with the outside through the cooling inlet and the cooling outlet respectively, and two plugs are arranged in each cooling channel to ensure the cooling fluid flows in the specified direction under the blocking action of the plugs. The plugs are in interference fit with the shaft sleeve and are locked by threads.

[0037] In some embodiments, the shaft sleeve 1 comprises a shaft sleeve body 101 and a flange plate 102 connected to the axial one-side end face of the shaft sleeve body 101, and the outer diameter of the flange plate 102 is greater than that of the shaft sleeve body 101; the cooling outlet 62 is formed on the flange plate 102 and extends in the radial direction, with the radial inner end of the cooling outlet 62 communicating with the outlet flow channel 4 and the radial outer end extending to the outer peripheral surface of the flange plate 102. This is a further preferred structural form of the shaft sleeve of the present application, i.e. the structure of the flange plate can be fixedly connected with the front bearing structure and the housing structure respectively, facilitating the fixation of the shaft sleeve, and the cooling outlet extends radially outward through the flange plate, which can effectively guide the cooling gas radially outward out of the shaft sleeve, without affecting the arrangement of other structures.

[0038] In some embodiments, the inlet flow channel 3 and the outlet flow channel 4 are spaced apart to form an opening of the annular flow channel 5, which is formed at a position between the liquid inlet and the liquid outlet of the annular flow channel 5. This is the preferred structural form of the annular structure of the present application, i.e. the annular structure of the present application is not a closed annular structure, but an opening is formed at the spaced position between the inlet flow channel and the outlet flow channel, so that the liquid inlet and the liquid outlet of the annular flow channel are not communicated, thereby ensuring the effective series communication of the fluid among the inlet flow channel, the annular flow channel and the outlet flow channel, increasing the flow area of the fluid and improving the heat exchange area with the motor stator to improve the cooling effect.

[0039] In some embodiments, the annular flow channel 5 comprises a first straight channel 51, a second straight channel 52 and at least one third straight channel 53; the first straight channel 51 extends to the outer circumferential wall of the shaft sleeve 1 at one end and to a position between the inner wall and the outer wall of the shaft sleeve 1 at the other end, the inlet flow channel 3 communicates with the first straight channel 51, one end of the second straight channel 52 communicates with the outlet flow channel 4 and the other end extends to the outer circumferential wall of the shaft sleeve 1, and the at least one third straight channel 53 can communicate the first straight channel 51 and the second straight channel 52. This is the preferred structure of the annular flow channel of the present application, i.e. the structure comprising the first, second and at least one third straight channels, the first straight channel is used to communicate with the inlet flow channel and can be used for liquid inlet or liquid outlet, the second straight channel communicates with the outlet flow channel and can be used for liquid outlet or liquid inlet, and the third straight channel communicates between the two, so that the third straight channel flows out after winding around more than half of the circumference inside the shaft sleeve, thereby increasing the flow area and the cooling effect.

[0040] As shown in the drawings, the inlet flow channel of the present application is preferably located on one side of the horizontal direction of the vertical center line of the shaft sleeve and at the upper end, the outlet flow channel is located on the other side of the horizontal direction of the vertical center line of the shaft sleeve and at the upper end, and the third straight channel extends from the bottom on one side of the vertical center line to the other side of the vertical center line, thereby increasing the flow area and improving the cooling effect with the motor stator. Figure 5

[0041] In some embodiments, the first straight channel 51, the at least one third straight channel 53 and the second straight channel 52 are sequentially arranged in communication along the circumferential direction of the shaft sleeve 1, the first straight channel 51 does not communicate with the second straight channel 52, and the fluid sequentially passes through the first straight channel 51, the at least one third straight channel 53 and the second straight channel 52, or the fluid sequentially passes through the second straight channel 52, the at least one third straight channel 53 and the first straight channel 51. This is a further preferred structure of the first, second and at least one third straight channels of the present application, i.e. the sequential arrangement in communication in the circumferential direction, so that the first, third and second straight channels can flow back to the inlet flow channel or the outlet flow channel after winding around more than half of the circumference in the circumferential direction, thereby greatly increasing the flow area in the circumferential direction and enhancing the cooling effect with the motor stator.

[0042] ​In some embodiments, the third straight passage 53 comprises a third straight passage one 531, a third straight passage two 532, a third straight passage three 533 and a third straight passage four 534, one end of the third straight passage one 531 communicates with the second straight passage 52, the other end extends to the outer peripheral wall of the shaft sleeve 1, one end of the third straight passage two 532 communicates with the third straight passage one 531, the other end extends to the outer peripheral wall of the shaft sleeve 1, one end of the third straight passage three 533 communicates with the third straight passage two 532, the other end extends to the outer peripheral wall of the shaft sleeve 1, one end of the third straight passage four 534 communicates with the third straight passage three 533, the other end extends to the outer peripheral wall of the shaft sleeve 1, the other end of the first straight passage 51 communicates with the third straight passage four 534; so that the first straight passage 51, the third straight passage four 534, the third straight passage three 533, the third straight passage two 532, the third straight passage one 531 and the second straight passage 52 communicate in turn along the circumference of the shaft sleeve 1;

[0043] The fluid flows through the first straight passage 51, the third straight passage four 534, the third straight passage three 533, the third straight passage two 532, the third straight passage one 531 and the second straight passage 52 in turn, or the fluid flows through the second straight passage 52, the third straight passage one 531, the third straight passage two 532, the third straight passage three 533, the third straight passage four 534 and the first straight passage 51 in turn.

[0044] This is a further preferred structure of the third straight passage of the present application, that is, a structure comprising a third straight passage one, a third straight passage two, a third straight passage three and a third straight passage four, which is also formed to communicate in turn in the circumferential direction of the shaft sleeve, can effectively increase the flow path in the circumferential direction, increase the flow area and improve the cooling effect, and each straight passage of the present application is formed by the outer peripheral wall of the shaft sleeve towards the interior direction, which is effective and convenient for processing, the outer peripheral wall of the shaft sleeve is effectively sealed by the shell, and the leakage of the cooling fluid in the sealing part is ensured.

[0045] The flow channel on a certain radial section of the shaft sleeve of the present application is preferably distributed in a regular polygonal shape, wherein 4 passages communicate with the adjacent flow channels respectively (i.e. 4 third straight passages), and the other 2 passages (i.e. the first and second straight passages) communicate with the outside and the adjacent radial flow channel, and communicate with the axial flow channel.

[0046] In some embodiments, the annular flow channels 5 are multiple, and the fluid sequentially flows through the inlet flow channel 3, the upstream annular flow channel 5, the outlet flow channel 4, the downstream annular flow channel 5, the inlet flow channel 3, and the outlet flow channel 4 in sequence to form a series communication structure. By arranging multiple annular flow channels, the fluid can sequentially flow through the inlet flow channel, the annular flow channel, the outlet flow channel, the annular flow channel, the inlet flow channel, and the like, further realizing the series communication of multiple annular flow channels, further increasing the flow length of the fluid inside the shaft sleeve, and enhancing the heat exchange area with the motor stator in the axial direction, thereby further improving the cooling effect.

[0047] In some embodiments, a first plug 71 is arranged in the inlet flow channel 3, the first plug 71 is arranged between two adjacent annular flow channels, and the first plug 71 is arranged between the liquid inlet of the annular flow channel upstream in the fluid flow direction and the liquid outlet of the annular flow channel downstream in the fluid flow direction.

[0048] A second plug 72 is arranged in the outlet flow channel 4, the second plug 72 is arranged between two adjacent annular flow channels, and the second plug 72 is arranged between the liquid inlet of the annular flow channel upstream in the fluid flow direction and the liquid outlet of the annular flow channel downstream in the fluid flow direction.

[0049] The first plug arranged in the inlet flow channel can seal and block the liquid inlet of the upstream annular flow channel and the liquid outlet of the adjacent downstream annular flow channel, prevent the fluid from flowing away from the inlet flow channel without entering the annular flow channel, effectively realize the series arrangement of the annular flow channel in the inlet and outlet flow channels, ensure the fluid to flow along multiple series annular flow channels, and improve the cooling effect of the motor stator. Similarly, the second plug arranged in the outlet flow channel can seal and block the liquid inlet of the upstream annular flow channel and the liquid outlet of the adjacent downstream annular flow channel, prevent the fluid from flowing away from the inlet flow channel without entering the annular flow channel, effectively realize the series arrangement of the annular flow channel in the inlet and outlet flow channels, ensure the fluid to flow along multiple series annular flow channels, and improve the cooling effect of the motor stator.

[0050] In some embodiments, an outer shell 8 is further included, the outer shell 8 is sleeved on the outer periphery of the shaft sleeve 1, and a sealing member 9 is arranged on at least one of the inner peripheral wall of the outer shell 8, the outer peripheral wall of the shaft sleeve 1, and the position between the outer shell 8 and the shaft sleeve 1. The outer shell of the present application is sleeved on the outer periphery of the shaft sleeve, which can seal the end of the annular flow channel penetrating the outer peripheral wall of the shaft sleeve, and the sealing member arranged between the inner and outer peripheral walls of the shaft sleeve and the outer shell can improve the sealing effect of the cooling fluid inside the shaft sleeve.

[0051] In some embodiments, the seal 9 comprises a first seal 91 and a second seal 92, the first seal 91 is arranged between the axial one end of the shaft sleeve 1 and the annular flow channel 5 closest to the axial one end, and the second seal 92 is arranged between the axial other end of the shaft sleeve 1 and the annular flow channel 5 closest to the axial other end. The seal of the present application further preferably comprises a first and a second seal, the first seal effectively seals between the axial one end of the shaft sleeve and the annular flow channel closest to the axial one end, and the second seal seals between the axial other end of the shaft sleeve and the annular flow channel closest to the axial other end, thereby ensuring the sealing effect of the plurality of annular flow channels inside the shaft sleeve, further improving the cooling effect.

[0052] The present application also provides an electric spindle comprising the stator cooling structure of any one of the preceding claims, further comprising a motor rotor 10 and a rotating shaft 11, the motor rotor 10 is sleeved on the outer periphery of the rotating shaft 11, and the motor stator 2 is located on the outer periphery of the motor rotor 10.

[0053] The present application provides a spindle stator cooling structure, and the cooperation and connection relationship of each part is as follows:

[0054] The front bearing seat 12, the shaft sleeve 1, the shell 8, the motor stator 2, the plug, the positioning sleeve 13, and the pipeline disc 14 are fixed parts; the shaft core (rotating shaft 11) and the motor rotor 10 are rotating parts. After the motor stator is powered on, the motor rotor drives the shaft core to rotate around the central axis. The shaft sleeve 1 is fixedly connected to the front bearing seat 12, the shell 8 is gap-fitted with the shaft sleeve, the relative position of the shell 8 and the shaft sleeve 1 is fixed through the locking action of the positioning sleeve 13 and the shaft sleeve 1.

[0055] The pipeline disc 14 and the positioning sleeve 13 are respectively provided with axial flow channels in the axial direction, which are communicated with the cooling inlets 61 on the shaft sleeve.

[0056] The plug is installed in the axial flow channel of the shaft sleeve, the plug is gap-fitted with the axial flow channel, and the axial position of the plug is fixed through the screw hole 15 on the shaft sleeve.

[0057] The shaft sleeve 1 is provided with axial flow channels (including the inflow channel 3 and the outflow channel 4) and radial flow channels (i.e. annular flow channels 5, which are not necessarily radial in essence, and can also be radial), both of which do not penetrate, and one end is in contact with the positioning sleeve; the annular flow channels are multiple and uniformly distributed along the axial direction, and in the radial section, the annular flow channels are uniformly distributed around the axis, and are distributed in a regular polygonal structure.

[0058] The motor stator cooling process is as follows:

[0059] The cooling liquid enters the cooling inlet on the pipe disc, reaches the cooling inlet 61 on the shaft sleeve through the positioning sleeve, and flows through the axial cooling channel (inlet channel 3) on the shaft sleeve. Under the action of the plug, the cooling liquid flows around the annular channel. When the cooling liquid passes through the hole on the shaft sleeve which is in communication with the outside in the radial direction, the cooling liquid cannot leak to the outside of the main shaft under the sealing action of the shell 8 and the first and second sealing members 91 and 92. The cooling liquid unidirectionally flows in the internal channel of the shaft sleeve, first passes through the axial channel (inlet channel 3 or outlet channel 4) to reach the annular channel 5, and then enters the next annular channel 5 through the axial channel (outlet channel 4 or inlet channel 3) after one round, and finally flows out of the cooling outlet on the shaft sleeve, thereby realizing the cooling effect of the main shaft motor stator.

[0060] The above description is merely preferred embodiments of the present application but not to confine the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above description is merely preferred embodiments of the present application but not to confine the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A stator cooling structure characterized by: The application relates to a stator cooling structure, comprising: a sleeve (1) sleeved on the outer periphery of a motor stator (2), wherein an inlet flow channel (3) and an outlet flow channel (4) are arranged on the sleeve (1), the inlet flow channel (3) is arranged at the position between the outer peripheral wall and the inner peripheral wall of the sleeve (1), the inlet flow channel (3) can introduce cooling fluid into the inlet flow channel (3) from the outside of the sleeve (1), the outlet flow channel (4) is arranged at the position between the outer peripheral wall and the inner peripheral wall of the sleeve (1), and the outlet flow channel (4) can guide the cooling fluid in the sleeve (1) to the outside, and an annular flow channel (5) is further arranged between the inner peripheral wall and the outer peripheral wall of the sleeve (1), one end of the annular flow channel (5) is communicated with the inlet flow channel (3), and the other end is communicated with the outlet flow channel (4). The inlet flow channel (3) and the outlet flow channel (4) are arranged in a spaced mode and form an opening of the annular flow channel (5), the opening is formed at the position where the liquid inlet and the liquid outlet of the annular flow channel (5) are not communicated. The annular flow channel (5) is a plurality of annular flow channels, and the fluid flows through the inlet flow channel (3), the upstream annular flow channel (5), the outlet flow channel (4), the downstream annular flow channel (5) and the inlet flow channel (3) in sequence along the flow direction of the fluid, thereby forming a series communication structure. A first plug (71) is arranged in the inlet flow channel (3), the first plug (71) is arranged between two adjacent annular flow channels, and the first plug (71) is arranged between the liquid inlet of the annular flow channel upstream in the flow direction of the fluid and the liquid outlet of the annular flow channel downstream in the flow direction of the fluid. A second plug (72) is arranged in the outlet flow channel (4), the second plug (72) is arranged between two adjacent annular flow channels, and the second plug (72) is arranged between the liquid inlet of the annular flow channel upstream in the flow direction of the fluid and the liquid outlet of the annular flow channel downstream in the flow direction of the fluid.

2. The stator cooling structure according to claim 1, wherein: the inlet flow channel (3) extends along the axial direction of the sleeve (1), a cooling inlet (61) is arranged at one end of the sleeve (1) in the axial direction, one end of the cooling inlet (61) is communicated with the inlet flow channel (3), and the other end of the cooling inlet (61) is communicated with the outside of the sleeve (1); and the outlet flow channel (4) also extends along the axial direction of the sleeve (1), a cooling outlet (62) is arranged at the other end of the sleeve (1) in the axial direction, one end of the cooling outlet (62) is communicated with the outlet flow channel (4), and the other end of the cooling outlet (62) extends to the outside of the sleeve (1).

3. The stator cooling structure according to claim 2, wherein: ​ ​ The shaft sleeve (1) comprises a shaft sleeve body (101) and a flange plate (102) connected to an axial one-side end surface of the shaft sleeve body (101), and the flange plate (102) has an outer diameter larger than that of the shaft sleeve body (101); the cooling outlet (62) is arranged on the flange plate (102) and extends in a radial direction, and a radial inner end of the cooling outlet (62) is communicated with the outflow channel (4) and a radial outer end thereof extends to an outer circumferential surface of the flange plate (102).

4. The stator cooling structure according to any one of claims 1-3, characterized in that: The annular flow channel (5) comprises a first straight channel (51), a second straight channel (52) and at least one third straight channel (53); one end of the first straight channel (51) extends to an outer circumferential wall of the shaft sleeve (1) and the other end thereof extends to a position between an inner wall and an outer wall of the shaft sleeve (1), the inflow channel (3) is communicated with the first straight channel (51), one end of the second straight channel (52) is communicated with the outflow channel (4) and the other end thereof extends to the outer circumferential wall of the shaft sleeve (1), and the at least one third straight channel (53) is capable of communicating the first straight channel (51) with the second straight channel (52).

5. The stator cooling structure according to claim 4, characterized in that: The first straight channel (51), the at least one third straight channel (53) and the second straight channel (52) are sequentially communicated and arranged along a circumferential direction of the shaft sleeve (1), the first straight channel (51) is not communicated with the second straight channel (52), and the fluid sequentially passes through the first straight channel (51), the at least one third straight channel (53) and the second straight channel (52), or sequentially passes through the second straight channel (52), the at least one third straight channel (53) and the first straight channel (51).

6. The stator cooling structure according to claim 5, characterized in that: The third straight passage (53) comprises a third straight passage one (531), a third straight passage two (532), a third straight passage three (533) and a third straight passage four (534), one end of the third straight passage one (531) is communicated with the second straight passage (52), the other end extends to the outer peripheral wall of the shaft sleeve (1), one end of the third straight passage two (532) is communicated with the third straight passage one (531), the other end extends to the outer peripheral wall of the shaft sleeve (1), one end of the third straight passage three (533) is communicated with the third straight passage two (532), the other end extends to the outer peripheral wall of the shaft sleeve (1), one end of the third straight passage four (534) is communicated with the third straight passage three (533), the other end extends to the outer peripheral wall of the shaft sleeve (1), the other end of the first straight passage (51) is communicated with the third straight passage four (534); so that the first straight passage (51), the third straight passage four (534), the third straight passage three (533), the third straight passage two (532), the third straight passage one (531) and the second straight passage (52) are sequentially communicated along the circumference of the shaft sleeve (1); Fluid flows through the first straight passage (51), the third straight passage four (534), the third straight passage three (533), the third straight passage two (532), the third straight passage one (531) and the second straight passage (52) in sequence, or fluid flows through the second straight passage (52), the third straight passage one (531), the third straight passage two (532), the third straight passage three (533), the third straight passage four (534) and the first straight passage (51) in sequence.

7. The stator cooling structure according to claim 1, characterized in that: Further comprising a housing (8), the housing (8) is sleeved on the outer periphery of the shaft sleeve (1), and a sealing element (9) is arranged on at least one of the inner peripheral wall of the housing (8), the outer peripheral wall of the shaft sleeve (1) and the position between the housing (8) and the shaft sleeve (1).

8. The stator cooling structure according to claim 7, characterized in that: The sealing element (9) comprises a first sealing element (91) and a second sealing element (92), the first sealing element (91) is arranged between the axial one end of the shaft sleeve (1) and the annular flow channel (5) closest to the axial one end, and the second sealing element (92) is arranged between the axial other end of the shaft sleeve (1) and the annular flow channel (5) closest to the axial other end.

9. An electric spindle characterized by: The stator cooling structure according to any one of claims 1-8, further comprising a motor rotor (10), a motor stator (2) and a rotating shaft (11), the motor rotor (10) is sleeved on the outer periphery of the rotating shaft (11), the motor stator (2) is located on the outer periphery of the motor rotor (10), and the shaft sleeve (1) is sleeved on the outer periphery of the motor stator (2).

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