A spindle core cooling assembly and an electric spindle

Abstract

The utility model provides a kind of main shaft core cooling assembly and electric spindle, main shaft core cooling assembly includes: shaft core, the first flow passage, the second flow passage and first communication channel are set in the shaft core, the first communication channel is communicated between the first flow passage with the second flow passage, along the direction of fluid flow, the first flow passage, the first communication channel and the second flow passage are sequentially communicated, the flow direction of cooling fluid in the first flow passage, with the flow direction of cooling fluid in the second flow passage is opposite.According to the utility model, at least two segments of reciprocating cooling flow channel structure can be formed on the shaft core, compared with the single flow channel of the shaft core in the prior art, the cooling length of the fluid to the shaft core is increased, and the cooling effect of the shaft core is improved.The problem of single cooling flow channel flow direction and poor cooling performance of the shaft core in the prior art electric spindle is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of electric spindle technology, specifically to a spindle core cooling assembly and an electric spindle. Background Technology

[0002] Adding a spindle core cooling structure to electric spindles—that is, introducing a cooling medium, such as coolant or compressed air, into the hollow spindle core—is a key design feature for solving the internal heat generation problem of high-speed electric spindles. Its core function is to efficiently and directly dissipate the heat generated by the motor stator, rotor, and bearings from the heat source, thereby significantly improving the operational reliability and mean time between failures (MTBF) of the electric spindle. Spindle core cooling is an indispensable design feature and a crucial technology for ensuring its performance, accuracy, lifespan, and reliability.

[0003] Patent application number 202510408109.7 proposes a cooling structure for an electric spindle core. This scheme obtains coolant through external piping and uses a drive component to drive a sliding sleeve to move axially, which can both distribute the coolant flow and cause the guide pipe to extend and retract within the flow path, accelerating the coolant flow rate. However, this core cooling scheme is structurally complex, requiring additional external piping for the drive component and coolant, which is detrimental to the spindle piping layout; furthermore, its unidirectional flow direction results in poor cooling performance for the core.

[0004] Because existing electric spindle cores have technical problems such as a single cooling flow direction and poor cooling performance, this utility model studies and designs a spindle core cooling assembly and an electric spindle. Utility Model Content

[0005] Therefore, the technical problem to be solved by this utility model is to overcome the defects of the existing electric spindle core having a single cooling flow direction and poor cooling performance of the core, thereby providing a spindle core cooling assembly and an electric spindle.

[0006] To address the aforementioned problems, this utility model provides a spindle core cooling assembly, comprising: The shaft core has a first flow channel, a second flow channel, and a first connecting channel. The first connecting channel connects the first flow channel and the second flow channel. Along the direction of fluid flow, the first flow channel, the first connecting channel, and the second flow channel are connected in sequence. The flow direction of the cooling fluid in the first flow channel is opposite to the flow direction of the cooling fluid in the second flow channel.

[0007] In some implementations... The first flow channel and the second flow channel are both located between the inner wall and the outer wall of the shaft core, and both the first flow channel and the second flow channel are direct current channels extending along the axial direction of the shaft core; One axial end of the shaft is the inlet of the cooling fluid, and the other axial end of the shaft is the outlet of the cooling fluid. The direction from one axial end to the other axial end of the shaft is defined as the first axial direction, and the direction from the other axial end to the first axial end is defined as the second axial direction. The flow direction of the fluid in the first flow channel is along the first axial direction, and the flow direction of the fluid in the second flow channel is along the second axial direction. The first flow channel and the second flow channel are channels located at different circumferential positions on the shaft.

[0008] In some implementations... The first connecting channel is disposed on the shaft core and includes an arc-shaped channel. The arc-shaped channel of the first connecting channel is located on the outer wall of the shaft core and extends along the circumference of the shaft core. The first connecting channel connects the outlet end of the first flow channel with the inlet end of the second flow channel. A first sealing ring groove is disposed on both axial sides of the first connecting channel on the outer wall of the shaft core, and a sealing ring can be disposed in the first sealing ring groove.

[0009] In some implementations... It also includes an outflow channel, which is also formed on the shaft core. The outflow channel can communicate with the second flow channel and can discharge cooling fluid out of the shaft core.

[0010] In some implementations... It also includes a third flow channel, a second connecting channel, a fourth flow channel, and a third connecting channel, wherein the third flow channel, the second connecting channel, the fourth flow channel, and the third connecting channel are connected between the second flow channel and the outflow channel; The second connecting channel connects the second flow channel and the third flow channel. Along the direction of fluid flow, the second flow channel, the second connecting channel and the third flow channel are connected in sequence. The flow direction of the cooling fluid in the second flow channel is opposite to the flow direction of the cooling fluid in the third flow channel. The third connecting channel is connected between the third flow channel and the fourth flow channel. Along the direction of fluid flow, the third flow channel, the third connecting channel and the fourth flow channel are connected in sequence. The flow direction of the cooling fluid in the third flow channel is opposite to the flow direction of the cooling fluid in the fourth flow channel.

[0011] In some implementations... The third and fourth flow channels are both located between the inner and outer walls of the shaft core, and both the third and fourth flow channels are direct current channels extending along the axial direction of the shaft core. One axial end of the shaft is the inlet of the cooling fluid, and the other axial end of the shaft is the outlet of the cooling fluid. The direction from one axial end to the other axial end of the shaft is defined as the first axial direction, and the direction from the other axial end to the first axial end is defined as the second axial direction. The flow direction of the fluid in the third flow channel is along the first axial direction, and the flow direction of the fluid in the fourth flow channel is along the second axial direction. The third flow channel and the fourth flow channel are channels located at different circumferential positions on the shaft.

[0012] In some implementations... It also includes a shaft end cap, which is disposed at one axial end of the shaft. The outlet end of the second flow channel extends to a position where it connects with the shaft end cap, and the inlet end of the third flow channel also extends to a position where it connects with the shaft end cap. The second connecting channel is an arc-shaped channel disposed on the end face of the shaft end cap, which connects the outlet end of the second flow channel with the inlet end of the third flow channel. A second sealing ring groove is provided on the outer periphery of the second connecting channel, and a sealing ring can be disposed in the second sealing ring groove. The third connecting channel is disposed on the shaft core and includes an arc-shaped channel. The arc-shaped channel of the third connecting channel is located on the outer wall of the shaft core and extends circumferentially along the shaft core. The third connecting channel connects the outlet end of the third flow channel with the inlet end of the fourth flow channel. A first sealing ring groove is provided on both axial sides of the third connecting channel on the outer wall of the shaft core, and a sealing ring can be disposed in the first sealing ring groove.

[0013] In some implementations... It also includes a fifth flow channel, a fourth connecting channel, a sixth flow channel, and a fifth connecting channel, wherein the fifth flow channel, the fourth connecting channel, the sixth flow channel, and the fifth connecting channel are connected between the fourth flow channel and the outflow channel; The fourth connecting channel is connected between the fourth flow channel and the fifth flow channel. Along the direction of fluid flow, the fourth flow channel, the fourth connecting channel, and the fifth flow channel are connected in sequence. The flow direction of the cooling fluid in the fourth flow channel is opposite to the flow direction of the cooling fluid in the fifth flow channel. The fifth connecting channel is connected between the fifth flow channel and the sixth flow channel. Along the direction of fluid flow, the fifth flow channel, the fifth connecting channel, and the sixth flow channel are connected in sequence. The flow direction of the cooling fluid in the fifth flow channel is opposite to the flow direction of the cooling fluid in the sixth flow channel.

[0014] In some implementations... The fifth and sixth flow channels are both located between the inner and outer walls of the shaft core, and both the fifth and sixth flow channels are direct current channels extending along the axial direction of the shaft core. One axial end of the shaft is the inlet of the cooling fluid, and the other axial end of the shaft is the outlet of the cooling fluid. The direction from one axial end to the other axial end of the shaft is defined as the first axial direction, and the direction from the other axial end to the first axial end is defined as the second axial direction. The flow direction of the fluid in the fifth flow channel is along the first axial direction, and the flow direction of the fluid in the sixth flow channel is along the second axial direction. The fifth flow channel and the sixth flow channel are channels located at different circumferential positions on the shaft.

[0015] In some implementations... It also includes a shaft end cap, which is disposed at one axial end of the shaft. The outlet end of the fourth flow channel extends to a position where it connects with the shaft end cap, and the inlet end of the fifth flow channel also extends to a position where it connects with the shaft end cap. The fourth connecting channel is an arc-shaped channel disposed on the end face of the shaft end cap, which connects the outlet end of the fourth flow channel with the inlet end of the fifth flow channel. A second sealing ring groove is provided on the outer periphery of the fourth connecting channel, and a sealing ring can be disposed in the second sealing ring groove. The fifth connecting channel is disposed on the shaft core and includes an arc-shaped channel. The arc-shaped channel of the fifth connecting channel is located on the outer wall of the shaft core and extends circumferentially along the shaft core. The fifth connecting channel connects the outlet end of the fifth flow channel with the inlet end of the sixth flow channel. A first sealing ring groove is provided on both axial sides of the fifth connecting channel on the outer wall of the shaft core, and a sealing ring can be disposed in the first sealing ring groove.

[0016] In some implementations... The shaft core is also provided with a seventh flow channel, a sixth connecting channel and a seventh connecting channel, the seventh flow channel, the sixth connecting channel and the seventh connecting channel being connected between the sixth flow channel and the outflow channel; The sixth connecting channel is connected between the sixth flow channel and the seventh flow channel. Along the direction of fluid flow, the sixth flow channel, the sixth connecting channel, and the seventh flow channel are connected in sequence. The flow direction of the cooling fluid in the sixth flow channel is opposite to the flow direction of the cooling fluid in the seventh flow channel. The seventh connecting channel is connected between the seventh flow channel and the outflow channel. Along the direction of fluid flow, the seventh flow channel, the seventh connecting channel, and the outflow channel are connected in sequence. The flow direction of the cooling fluid in the seventh flow channel is opposite to the flow direction of the cooling fluid in the outflow channel.

[0017] In some implementations... The seventh flow channel and the outflow channel are both located between the inner wall and the outer wall of the shaft core, and both the seventh flow channel and the outflow channel are direct current channels extending along the axial direction of the shaft core; One axial end of the shaft is the inlet of the cooling fluid, and the other axial end of the shaft is the outlet of the cooling fluid. The direction from one axial end to the other axial end of the shaft is defined as the first axial direction, and the direction from the other axial end to the first axial end is defined as the second axial direction. The flow direction of the fluid in the seventh flow channel is along the first axial direction, and the flow direction of the fluid in the outlet channel is along the second axial direction. The seventh flow channel and the outlet channel are channels located at different circumferential positions on the shaft.

[0018] In some implementations... It also includes a shaft end cap, which is disposed at one axial end of the shaft. The outlet end of the sixth flow channel extends to a position where it connects with the shaft end cap, and the inlet end of the seventh flow channel also extends to a position where it connects with the shaft end cap. The sixth connecting channel is an arc-shaped channel disposed on the end face of the shaft end cap, which connects the outlet end of the sixth flow channel with the inlet end of the seventh flow channel. A second sealing ring groove is provided on the outer periphery of the sixth connecting channel, and a sealing ring can be disposed in the second sealing ring groove. The seventh connecting channel is disposed on the shaft core and includes an arc-shaped channel. The arc-shaped channel of the seventh connecting channel is located on the outer wall of the shaft core and extends circumferentially along the shaft core. The seventh connecting channel connects the outflow end of the seventh flow channel with the inflow end of the outflow channel. A first sealing ring groove is provided on both axial sides of the seventh connecting channel on the outer wall of the shaft core, and a sealing ring can be disposed in the first sealing ring groove.

[0019] In some implementations... It also includes a pull rod, which passes through the inside of the shaft core, and the inside of the pull rod is provided with an inlet flow channel, an outlet flow channel, a first intermediate flow channel and a second intermediate flow channel. The inlet flow channel can communicate with the first flow channel through the first intermediate flow channel so that cooling fluid can be introduced into the first flow channel inside the shaft core through the inlet flow channel. The outlet flow channel can be connected to the outflow channel through the second intermediate flow channel so that the cooling fluid inside the shaft core can be discharged through the outlet flow channel.

[0020] In some implementations... The inlet channel is a direct current channel extending along the axial direction of the pull rod, that is, the extension direction of the inlet channel is parallel to the axial direction of the pull rod. The outlet channel is also a direct current channel extending along the axial direction of the pull rod, that is, the extension direction of the outlet channel is parallel to the axial direction of the pull rod. One end of the inlet channel is located at one axial end of the pull rod, and the other end of the inlet channel extends toward the interior of the pull rod to a first position. One end of the outlet channel is located at the other axial end of the pull rod, and the other end of the outlet channel extends toward the interior of the pull rod to a second position. The first position and the second position are spaced apart by a preset distance greater than 0.

[0021] In some implementations... It also includes a third intermediate flow channel, a fourth intermediate flow channel, a first annular flow channel, and a second annular flow channel. One end of the first intermediate flow channel is connected to the inlet flow channel, and the other end of the first intermediate flow channel is connected to the first annular flow channel. One end of the third intermediate flow channel is connected to the first annular flow channel, and the other end of the third intermediate flow channel is connected to the first flow channel. One end of the second intermediate flow channel is connected to the outlet flow channel, and the other end of the second intermediate flow channel is connected to the second annular flow channel. One end of the fourth intermediate flow channel is connected to the second annular flow channel, and the other end of the fourth intermediate flow channel is connected to the outflow channel.

[0022] In some implementations... The third intermediate flow channel and the fourth intermediate flow channel are both opened on the inner wall of the shaft core, and the first annular flow channel and the second annular flow channel are both opened on the outer wall of the pull rod, and the first annular flow channel and the second annular flow channel are spaced apart by a preset distance greater than 0 along the axial direction of the shaft core.

[0023] In some implementations... It also includes a shaft core sleeve and a fastening ring. The shaft core sleeve is fitted around the outer periphery of the shaft core, and the shaft core sleeve is opposite to the first communicating channel in the radial direction of the shaft core so as to seal the first communicating channel. The fastening ring is also fitted around the outer periphery of the shaft core, and the fastening ring abuts against one axial end of the shaft core sleeve.

[0024] In some implementations... It also includes a shaft core positioning key. A portion of the inner circumference of the shaft core has a tapered hole. The shaft core positioning key is disposed in the tapered hole. The shaft core positioning key includes an annular body, a first key, a second key, and a spring hole. The first key is disposed on one axial end face of the annular body and protrudes a first length along the axial direction of the annular body. The second key is also disposed on one axial end face of the annular body and protrudes a second length along the axial direction of the annular body. The first length is greater than the second length. The annular body is also provided with the spring hole penetrating both axial end faces. A spring pin can be disposed in the spring hole.

[0025] This utility model also provides an electric spindle, which includes the aforementioned spindle core cooling assembly.

[0026] The spindle core cooling assembly and electric spindle provided by this utility model have the following beneficial effects: 1. This utility model, by providing a structure on the spindle core including a first flow channel, a second flow channel, and a first connecting channel, wherein the first flow channel, the first connecting channel, and the second flow channel are sequentially connected along the fluid flow direction, and the flow direction of the fluid in the first flow channel is opposite to the flow direction of the fluid in the second flow channel, can form at least two reciprocating cooling channel structures on the spindle core. Compared with the single flow channel of the spindle core in the prior art, this greatly increases the fluid flow path, increases the cooling length of the spindle core, and improves the cooling effect on the spindle core; effectively solving the problem that the cooling channel of the electric spindle core in the prior art has a single flow direction and poor cooling performance of the spindle core.

[0027] 2. This utility model further utilizes a structure consisting of a third flow channel, a fourth flow channel, and a second and third connecting channel, connected to the downstream end of the second flow channel. The flow direction of the cooling fluid in the second flow channel is opposite to that in the third flow channel, and the flow direction of the cooling fluid in the third flow channel is opposite to that in the fourth flow channel. This further forms a multi-segment reciprocating cooling channel structure on the shaft core, further improving the cooling effect on the shaft core. Furthermore, this utility model utilizes a structure consisting of a fifth flow channel, a sixth flow channel, and a fourth and fifth connecting channel, connected to the downstream end of the fourth flow channel. The flow direction of the cooling fluid in the fourth flow channel is opposite to that in the fifth flow channel, and the flow direction of the cooling fluid in the fifth flow channel is opposite to that in the sixth flow channel. This further forms a multi-segment reciprocating cooling channel structure on the shaft core, further improving the cooling effect on the shaft core.

[0028] 3. Furthermore, this utility model further connects to the downstream end of the sixth flow channel through a structure consisting of a seventh flow channel, an outflow channel, and a sixth and seventh connecting channel. The flow direction of the cooling fluid in the seventh flow channel is opposite to that in the sixth flow channel, and the flow direction of the cooling fluid in the outflow channel is opposite to that in the seventh flow channel. This further forms a multi-segment reciprocating cooling channel structure on the shaft core, which can further improve the cooling effect on the shaft core. Attached Figure Description

[0029] Figure 1 This is a cross-sectional view of the spindle core cooling assembly of this utility model; Figure 2 yes Figure 1 A schematic diagram of the cooling channel structure for the tie rod and shaft core; Figure 3 yes Figure 1 Three-dimensional structural diagrams of the spindle core portion at the first and second connecting channels respectively; Figure 4 yes Figure 1 A schematic diagram of the structure of the second, fourth and sixth connecting channels at the shaft core end cap; Figure 5 yes Figure 1 A three-dimensional structural diagram of the shaft core positioning key.

[0030] The reference numerals in the attached figures are as follows: 1. Shaft core; 2. Shaft core positioning key; 3. Spring pin; 4. Shaft core sleeve; 5. Fastening ring; 6. Motor rotor; 7. Elastic element; 8. Pull rod; 9. Shaft core end cover; 11. First flow channel; 12. Second flow channel; 13. First connecting channel; 14. Outflow channel; 15. Third flow channel; 16. Second connecting channel; 17. Fourth flow channel; 18. Third connecting channel; 19. Fifth flow channel; 20. Fourth connecting channel; 21. Sixth flow channel; 22. 23. Fifth connecting channel; 24. Seventh flow channel; 25. Sixth connecting channel; 26. Seventh connecting channel; 27. Inlet flow channel; 28. Outlet flow channel; 29. ​​First intermediate flow channel; 30. Third intermediate flow channel; 31. Fourth intermediate flow channel; 32. First annular flow channel; 33. Second annular flow channel; 34. Conical hole; 35. Annular body; 36. First key; 37. Second key; 38. Spring hole; 39. First sealing ring groove; 40. Second sealing ring groove. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0033] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0034] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0035] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0036] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0037] like Figure 1-5 As shown, this utility model provides a spindle core cooling assembly, which includes: The shaft core 1 has a first flow channel 11, a second flow channel 12 and a first connecting channel 13. The first connecting channel 13 connects the first flow channel 11 and the second flow channel 12. Along the direction of fluid flow, the first flow channel 11, the first connecting channel 13 and the second flow channel 12 are connected in sequence. The flow direction of the cooling fluid in the first flow channel 11 is opposite to the flow direction of the cooling fluid in the second flow channel 12.

[0038] This invention, by providing a structure on the spindle core including a first flow channel, a second flow channel, and a first connecting channel, wherein the first flow channel, the first connecting channel, and the second flow channel are sequentially connected along the fluid flow direction, and the fluid flow direction in the first flow channel is opposite to the fluid flow direction in the second flow channel, can form at least two reciprocating cooling channel structures on the spindle core. Compared with the single flow channel of the spindle core in the prior art, this greatly increases the fluid flow path, increases the cooling length of the spindle core, and improves the cooling effect on the spindle core; effectively solving the problem that the cooling channel of the electric spindle core in the prior art has a single flow direction and poor cooling performance of the spindle core.

[0039] In some implementations... The first flow channel 11 and the second flow channel 12 are both located between the inner wall and the outer wall of the shaft core 1. The first flow channel 11 and the second flow channel 12 are both direct flow channels extending along the axial direction of the shaft core 1. One axial end of the shaft core 1 is the inlet end of the cooling fluid, and the other axial end of the shaft core 1 is the outlet end of the cooling fluid. The direction from one axial end to the other axial end of the shaft core 1 is defined as the first axial direction, and the direction from the other axial end to the first axial end is defined as the second axial direction. The flow direction of the fluid in the first flow channel 11 is along the first axial direction, and the flow direction of the fluid in the second flow channel 12 is along the second axial direction. The first flow channel 11 and the second flow channel 12 are channels located at different circumferential positions on the shaft core 1.

[0040] This is a preferred structural form of the first and second flow channels of this utility model, namely, both are direct flow channels extending along the axis of the shaft core, and the first flow channel flows along the first axial direction, while the second flow channel flows along the second axial direction, thereby forming two direct flow channels with opposite flow directions, forming a reciprocating cooling flow channel on the shaft core, increasing the cooling path of the shaft core, and improving the cooling effect of the shaft core; the first and second flow channels of this utility model are preferably located at different circumferential positions on the shaft core, ensuring that the shaft core is cooled at one circumferential position and then flows back and forth to another circumferential position to continue cooling the shaft core, increasing the cooling area of ​​the shaft core in the circumferential direction, and further improving the cooling effect of the shaft core.

[0041] In some implementations... The first connecting channel 13 is disposed on the shaft core 1 and includes an arc-shaped channel. The arc-shaped channel of the first connecting channel 13 is located on the outer wall of the shaft core 1 and extends circumferentially along the shaft core 1. The first connecting channel 13 connects the outlet end of the first flow channel 11 with the inlet end of the second flow channel 12. The outer wall of the shaft core 1 is provided with first sealing ring grooves 39 on both axial sides of the first connecting channel 13. A sealing ring can be disposed in the first sealing ring grooves 39.

[0042] This is a preferred structural form of the first connecting channel of this utility model. The first and second flow channels are connected by an arc-shaped flow channel opened on the outer peripheral wall of the shaft core, forming a reciprocating flow channel structure with at least two segments connected in series. The first connecting channel is provided with a first sealing ring groove on both axial sides, which can be used to install a sealing ring, thereby ensuring the sealing effect of the first connecting channel at this location, ensuring that the cooling fluid will not leak, and improving the cooling and heat dissipation effect on the shaft core.

[0043] In some implementations... It also includes an outflow channel 14, which is also formed on the shaft core 1. The outflow channel 14 can communicate with the second flow channel 12, and the outflow channel 14 can discharge cooling fluid out of the shaft core 1.

[0044] This invention, through a preferred structural form with an outflow channel on the shaft core, can export the cooled fluid inside the shaft core, achieving a continuous inflow and outflow of cooling fluid and improving the cooling effect on the shaft core.

[0045] In some implementations... It also includes a third flow channel 15, a second connecting channel 16, a fourth flow channel 17, and a third connecting channel 18, wherein the third flow channel 15, the second connecting channel 16, the fourth flow channel 17, and the third connecting channel 18 are connected between the second flow channel 12 and the outflow channel 14; The second connecting channel 16 connects the second flow channel 12 and the third flow channel 15. Along the direction of fluid flow, the second flow channel 12, the second connecting channel 16 and the third flow channel 15 are connected in sequence. The flow direction of the cooling fluid in the second flow channel 12 is opposite to the flow direction of the cooling fluid in the third flow channel 15. The third connecting channel 18 connects the third flow channel 15 and the fourth flow channel 17. Along the direction of fluid flow, the third flow channel 15, the third connecting channel 18 and the fourth flow channel 17 are connected in sequence. The flow direction of the cooling fluid in the third flow channel 15 is opposite to the flow direction of the cooling fluid in the fourth flow channel 17.

[0046] This invention further utilizes the aforementioned third flow channel, fourth flow channel, and second / third connecting channel structure to connect to the downstream end of the second flow channel. The flow direction of the cooling fluid in the second flow channel is opposite to that in the third flow channel, and vice versa. This further forms a multi-segment reciprocating cooling channel structure on the shaft core, thereby further improving the cooling effect on the shaft core. In some implementations... The third flow channel 15 and the fourth flow channel 17 are both located between the inner wall and the outer wall of the shaft core 1, and both the third flow channel 15 and the fourth flow channel 17 are direct flow channels extending along the axial direction of the shaft core 1. One axial end of the shaft core 1 is the inlet end of the cooling fluid, and the other axial end of the shaft core 1 is the outlet end of the cooling fluid. The direction from one axial end of the shaft core 1 to the other axial end is defined as the first axial direction, and the direction from the other axial end to the first axial end is defined as the second axial direction. The flow direction of the fluid in the third flow channel 15 is along the first axial direction, and the flow direction of the fluid in the fourth flow channel 17 is along the second axial direction. The third flow channel 15 and the fourth flow channel 17 are channels located at different circumferential positions on the shaft core 1.

[0047] This is a preferred structural form of the third and fourth flow channels of this utility model, namely, both are direct-flow channels extending along the axis of the shaft core, with the third flow channel flowing along the first axial direction and the fourth flow channel flowing along the second axial direction, thus forming two direct-flow channels with opposite flow directions, forming a reciprocating cooling flow channel on the shaft core, increasing the cooling path of the shaft core, and improving the cooling effect of the shaft core; the third and fourth flow channels of this utility model are preferably located at different circumferential positions on the shaft core, ensuring that the shaft core is cooled at one circumferential position and then flows back and forth to another circumferential position to continue cooling the shaft core, further increasing the reciprocating cooling area of ​​the shaft core in multiple circumferential directions, and further improving the cooling effect of the shaft core.

[0048] In some implementations... It also includes a shaft end cap 9, which is disposed at one axial end of the shaft 1. The outlet end of the second flow channel 12 extends to a position connected with the shaft end cap 9, and the inlet end of the third flow channel 15 also extends to a position connected with the shaft end cap 9. The second connecting channel 16 is an arc-shaped channel disposed on the end face of the shaft end cap 9, which connects the outlet end of the second flow channel 12 with the inlet end of the third flow channel 15. A second sealing ring groove 40 is provided on the outer periphery of the second connecting channel 16, and a sealing ring can be disposed in the second sealing ring groove 40. The third connecting channel 18 is disposed on the shaft core 1 and includes an arc-shaped channel. The arc-shaped channel of the third connecting channel 18 is located on the outer wall of the shaft core 1 and extends circumferentially along the shaft core 1. The third connecting channel 18 connects the outlet end of the third flow channel 15 with the inlet end of the fourth flow channel 17. The outer wall of the shaft core 1 is provided with first sealing ring grooves 39 on both axial sides of the third connecting channel 18, and sealing rings can be disposed in the first sealing ring grooves 39.

[0049] This is a preferred structural form of the second connecting channel of this utility model. An arc-shaped channel is formed on the end cap of the shaft core connected to one axial end of the shaft core, effectively connecting two second and third flow channels with opposite flow directions in series, forming a reciprocating flow channel structure of at least three segments in series. A second sealing ring groove is provided on the outer periphery of the second connecting channel, allowing for the installation of a sealing ring to ensure a seal on the second connecting channel, preventing leakage of cooling fluid and improving the cooling and heat dissipation effect on the shaft core. This utility model also provides a preferred structural form of the third connecting channel, which connects the third and fourth flow channels through an arc-shaped flow channel on the outer peripheral wall of the shaft core, forming a reciprocating flow channel structure of at least four segments in series. First sealing ring grooves are provided on both axial sides of the first connecting channel, allowing for the installation of sealing rings to ensure a seal on the third connecting channel, preventing leakage of cooling fluid and improving the cooling and heat dissipation effect on the shaft core.

[0050] In some implementations... It also includes a fifth flow channel 19, a fourth connecting channel 20, a sixth flow channel 21, and a fifth connecting channel 22, wherein the fifth flow channel 19, the fourth connecting channel 20, the sixth flow channel 21, and the fifth connecting channel 22 are connected between the fourth flow channel 17 and the outflow channel 14; The fourth connecting channel 20 is connected between the fourth flow channel 17 and the fifth flow channel 19. Along the direction of fluid flow, the fourth flow channel 17, the fourth connecting channel 20 and the fifth flow channel 19 are connected in sequence. The flow direction of the cooling fluid in the fourth flow channel 17 is opposite to the flow direction of the cooling fluid in the fifth flow channel 19. The fifth connecting channel 22 is connected between the fifth flow channel 19 and the sixth flow channel 21. Along the direction of fluid flow, the fifth flow channel 19, the fifth connecting channel 22 and the sixth flow channel 21 are connected in sequence. The flow direction of the cooling fluid in the fifth flow channel 19 is opposite to the flow direction of the cooling fluid in the sixth flow channel 21.

[0051] This invention further connects to the downstream end of the fourth flow channel through the aforementioned fifth flow channel, sixth flow channel, and fourth and fifth connecting channel structure. The flow direction of the cooling fluid in the fourth flow channel is opposite to that in the fifth flow channel, and the flow direction of the cooling fluid in the fifth flow channel is opposite to that in the sixth flow channel. This further forms a multi-segment reciprocating cooling channel structure on the shaft core, which can further improve the cooling effect on the shaft core.

[0052] In some implementations... The fifth flow channel 19 and the sixth flow channel 21 are both located between the inner wall and the outer wall of the shaft core 1, and both the fifth flow channel 19 and the sixth flow channel 21 are direct current channels extending along the axial direction of the shaft core 1. One axial end of the shaft core 1 is the inlet end of the cooling fluid, and the other axial end of the shaft core 1 is the outlet end of the cooling fluid. The direction from one axial end of the shaft core 1 to the other axial end is defined as the first axial direction, and the direction from the other axial end to the first axial end is defined as the second axial direction. The flow direction of the fluid in the fifth flow channel 19 is along the first axial direction, and the flow direction of the fluid in the sixth flow channel 21 is along the second axial direction. The fifth flow channel 19 and the sixth flow channel 21 are channels located at different circumferential positions on the shaft core 1.

[0053] This is a preferred structural form of the fifth and sixth flow channels of this utility model, namely, both are direct-flow channels extending along the axis of the shaft core, with the fifth flow channel flowing along the first axial direction and the sixth flow channel flowing along the second axial direction, thus forming two direct-flow channels with opposite flow directions, forming a reciprocating cooling flow channel on the shaft core, further increasing the cooling path of the shaft core and improving the cooling effect of the shaft core; the fifth and sixth flow channels of this utility model are preferably located at different circumferential positions on the shaft core, ensuring that the shaft core is cooled at one circumferential position and then flows back and forth to another circumferential position to continue cooling the shaft core, further increasing the reciprocating cooling area of ​​the shaft core in multiple circumferential directions, and further improving the cooling effect of the shaft core.

[0054] In some implementations... It also includes a shaft end cap 9, which is disposed at one axial end of the shaft 1. The outlet end of the fourth flow channel 17 extends to a position connected with the shaft end cap 9, and the inlet end of the fifth flow channel 19 also extends to a position connected with the shaft end cap 9. The fourth connecting channel 20 is an arc-shaped channel disposed on the end face of the shaft end cap 9, and the fourth connecting channel 20 connects the outlet end of the fourth flow channel 17 with the inlet end of the fifth flow channel 19. A second sealing ring groove 40 is provided on the outer periphery of the fourth connecting channel 20, and a sealing ring can be disposed in the second sealing ring groove 40. The fifth connecting channel 22 is disposed on the shaft core 1 and includes an arc-shaped channel. The arc-shaped channel of the fifth connecting channel 22 is located on the outer wall of the shaft core 1 and extends circumferentially along the shaft core 1. The fifth connecting channel 22 connects the outlet end of the fifth flow channel 19 with the inlet end of the sixth flow channel 21. The outer wall of the shaft core 1 is provided with first sealing ring grooves 39 on both axial sides of the fifth connecting channel 22. A sealing ring can be disposed in the first sealing ring grooves 39.

[0055] This is a preferred structural form of the fourth connecting channel of this utility model. An arc-shaped channel is formed on the end cap of the shaft core, which connects to one axial end of the shaft core, effectively connecting two fourth and fifth flow channels with opposite flow directions in series. This forms a reciprocating flow channel structure with at least five segments in series. A second sealing ring groove is provided on the outer periphery of the fourth connecting channel, allowing for the installation of a sealing ring to ensure a tight seal and prevent leakage of cooling fluid, thus improving the cooling and heat dissipation effect on the shaft core. This utility model also provides a preferred structural form of the fifth connecting channel. An arc-shaped flow channel is formed on the outer peripheral wall of the shaft core to connect the fifth and sixth flow channels, forming a reciprocating flow channel structure with at least six segments in series. First sealing ring grooves are provided on both axial sides of the fifth connecting channel, allowing for the installation of sealing rings to ensure a tight seal and prevent leakage of cooling fluid, thus improving the cooling and heat dissipation effect on the shaft core.

[0056] In some implementations... The shaft core 1 is also provided with a seventh flow channel 23, a sixth connecting channel 24 and a seventh connecting channel 25, wherein the seventh flow channel 23, the sixth connecting channel 24 and the seventh connecting channel 25 are connected between the sixth flow channel 21 and the outflow channel 14; The sixth connecting channel 24 connects the sixth flow channel 21 and the seventh flow channel 23. Along the direction of fluid flow, the sixth flow channel 21, the sixth connecting channel 24 and the seventh flow channel 23 are connected in sequence. The flow direction of the cooling fluid in the sixth flow channel 21 is opposite to the flow direction of the cooling fluid in the seventh flow channel 23. The seventh connecting channel 25 is connected between the seventh flow channel 23 and the outflow channel 14. Along the direction of fluid flow, the seventh flow channel 23, the seventh connecting channel 25 and the outflow channel 14 are connected in sequence. The flow direction of the cooling fluid in the seventh flow channel 23 is opposite to the flow direction of the cooling fluid in the outflow channel 14.

[0057] This invention further connects to the downstream end of the sixth flow channel through a structure consisting of a seventh flow channel, an outflow channel, and a sixth and seventh connecting channel. The flow direction of the cooling fluid in the seventh flow channel is opposite to that in the sixth flow channel, and the flow direction of the cooling fluid in the outflow channel is also opposite to that in the seventh flow channel. This further forms a multi-segment reciprocating cooling channel structure on the shaft core, which can further improve the cooling effect on the shaft core.

[0058] In some implementations... The seventh flow channel 23 and the outflow channel 14 are both located between the inner wall and the outer wall of the shaft core 1. The seventh flow channel 23 and the outflow channel 14 are both direct current channels extending along the axial direction of the shaft core 1. One axial end of the shaft core 1 is the inlet end of the cooling fluid, and the other axial end of the shaft core 1 is the outlet end of the cooling fluid. The direction from one axial end of the shaft core 1 to the other axial end is defined as the first axial direction, and the direction from the other axial end to the first axial end is defined as the second axial direction. The flow direction of the fluid in the seventh flow channel 23 is along the first axial direction, and the flow direction of the fluid in the outlet channel 14 is along the second axial direction. The seventh flow channel 23 and the outlet channel 14 are channels located at different circumferential positions on the shaft core 1.

[0059] This is a preferred structural form of the seventh flow channel and the outflow channel of this utility model. Both are direct-flow channels extending along the axis of the shaft core. The seventh flow channel flows along the first axial direction, and the outflow channel flows along the second axial direction, thus forming two direct-flow channels with opposite flow directions. This forms a reciprocating cooling channel on the shaft core, increasing the cooling path of the shaft core and improving the cooling effect. The seventh flow channel and the outflow channel of this utility model are preferably located at different circumferential positions on the shaft core, ensuring that the shaft core is cooled at one circumferential position and then flows back and forth to another circumferential position to continue cooling the shaft core. This further increases the reciprocating cooling area of ​​the shaft core in multiple circumferential directions and further improves the cooling effect of the shaft core.

[0060] In some implementations... It also includes a shaft end cap 9, which is disposed at one axial end of the shaft 1. The outlet end of the sixth flow channel 21 extends to a position connected with the shaft end cap 9, and the inlet end of the seventh flow channel 23 also extends to a position connected with the shaft end cap 9. The sixth connecting channel 24 is an arc-shaped channel disposed on the end face of the shaft end cap 9, which connects the outlet end of the sixth flow channel 21 with the inlet end of the seventh flow channel 23. A second sealing ring groove 40 is provided on the outer periphery of the sixth connecting channel 24, and a sealing ring can be disposed in the second sealing ring groove 40. The seventh connecting channel 25 is disposed on the shaft core 1 and includes an arc-shaped channel. The arc-shaped channel of the seventh connecting channel 25 is located on the outer wall of the shaft core 1 and extends circumferentially along the shaft core 1. The seventh connecting channel 25 connects the outflow end of the seventh flow channel 23 with the inflow end of the outflow channel 14. The outer wall of the shaft core 1 is provided with first sealing ring grooves 39 on both axial sides of the seventh connecting channel 25, and sealing rings can be disposed in the first sealing ring grooves 39.

[0061] This is a preferred structural form of the sixth connecting channel of this utility model. An arc-shaped channel is formed on the end cap of the shaft core connected to one axial end, effectively connecting two sixth and seventh flow channels with opposite flow directions in series, forming a reciprocating flow channel structure of at least seven segments in series. A second sealing ring groove is provided on the outer periphery of the sixth connecting channel, allowing for the installation of a sealing ring to ensure a tight seal, preventing leakage of cooling fluid and improving the cooling effect on the shaft core. This utility model also provides a preferred structural form of the seventh connecting channel, which connects the seventh flow channel and the outflow channel through an arc-shaped flow channel on the outer peripheral wall of the shaft core, forming a reciprocating flow channel structure of at least eight segments in series. First sealing ring grooves are provided on both axial sides of the seventh connecting channel, allowing for the installation of sealing rings to ensure a tight seal, preventing leakage of cooling fluid and improving the cooling effect on the shaft core.

[0062] In some implementations... It also includes a pull rod 8, which passes through the inside of the shaft core 1. The pull rod 8 has an inlet flow channel 26, an outlet flow channel 27, a first intermediate flow channel 28, and a second intermediate flow channel 29 inside. The inlet flow channel 26 can communicate with the first flow channel 11 through the first intermediate flow channel 28, so that cooling fluid can be introduced into the first flow channel 11 inside the shaft core 1 through the inlet flow channel 26. The outlet channel 27 can be connected to the outflow channel 14 through the second intermediate channel 29, so that the cooling fluid inside the shaft core 1 can be discharged through the outlet channel 27.

[0063] The present invention also preferably uses the above-mentioned tie rod structure, in which the inlet flow channel and the first intermediate flow channel are provided to connect with the first flow channel on the shaft core, providing cooling fluid to the first flow channel. It also connects with the outlet flow and the second intermediate flow channel to connect with the outlet channel on the shaft core, so as to export the cooled fluid on the shaft core, thereby achieving the effect of continuous entry and exit of cooling fluid and improving the cooling effect on the shaft core.

[0064] In some implementations... The inlet channel 26 is a straight channel extending along the axial direction of the pull rod 8, that is, the extension direction of the inlet channel 26 is parallel to the axial direction of the pull rod 8. The outlet channel 27 is also a straight channel extending along the axial direction of the pull rod 8, that is, the extension direction of the outlet channel 27 is parallel to the axial direction of the pull rod 8. One end of the inlet channel 26 is located at one axial end of the pull rod 8, and the other end of the inlet channel 26 extends toward the interior of the pull rod 8 to a first position. One end of the outlet channel 27 is located at the other axial end of the pull rod 8, and the other end of the outlet channel 27 extends toward the interior of the pull rod 8 to a second position. The first position and the second position are spaced apart by a preset distance greater than 0.

[0065] This is a preferred structural form of the inlet and outlet flow channels of this utility model. Both are preferably direct flow channels opened on the tie rod, and they are spaced apart in the axial direction so that the fluids at the inlet and outlet are not connected to each other. This achieves the effect of simultaneously using the tie rod to provide cooling fluid to the shaft core and to discharge the cooling fluid, thus achieving a compact structure and improving the cooling performance of the shaft core.

[0066] In some implementations... It also includes a third intermediate flow channel 30, a fourth intermediate flow channel 31, a first annular flow channel 32, and a second annular flow channel 33. One end of the first intermediate flow channel 28 is connected to the inlet flow channel 26, and the other end of the first intermediate flow channel 28 is connected to the first annular flow channel 32. One end of the third intermediate flow channel 30 is connected to the first annular flow channel 32, and the other end of the third intermediate flow channel 30 is connected to the first flow channel 11. One end of the second intermediate flow channel 29 is connected to the outlet flow channel 27, and the other end of the second intermediate flow channel 29 is connected to the second annular flow channel 33. One end of the fourth intermediate flow channel 31 is connected to the second annular flow channel 33, and the other end of the fourth intermediate flow channel 31 is connected to the outflow channel 14.

[0067] This invention further preferably connects the first intermediate flow channel on the tie rod to the first annular flow channel, while the third intermediate flow channel on the shaft core is also connected to the first annular flow channel. This ensures that even if the first and third intermediate flow channels are misaligned circumferentially, the first annular flow channel maintains their connection, ensuring the flow of cooling fluid into the shaft core. Similarly, the second annular flow channel connects the second intermediate flow channel on the tie rod to the second annular flow channel, while the fourth intermediate flow channel on the shaft core is also connected to the second annular flow channel. This ensures that even if the second and fourth intermediate flow channels are misaligned circumferentially, the second annular flow channel maintains their connection, ensuring the cooling fluid in the shaft core is always discharged outside the shaft core.

[0068] In some implementations... The third intermediate flow channel 30 and the fourth intermediate flow channel 31 are both opened on the inner wall of the shaft core 1, and the first annular flow channel 32 and the second annular flow channel 33 are both opened on the outer wall of the pull rod 8. The first annular flow channel 32 and the second annular flow channel 33 are spaced apart by a preset distance greater than 0 along the axial direction of the shaft core 1.

[0069] Preferably, the third and fourth intermediate flow channels are formed on the inner wall of the shaft core, and the first and second annular flow channels are formed on the outer wall of the tie rod. The first annular flow channel on the outer wall of the tie rod can guide the fluid to the third intermediate flow channel on the inner wall of the shaft core, and can also guide the fluid in the fourth intermediate flow channel on the inner wall of the shaft core to the second annular flow channel on the outer wall of the tie rod. The first and second annular flow channels are spaced apart along the axial direction, thereby ensuring that the first annular flow channel for entering the shaft core and the second annular flow channel for exiting the shaft core fluid are not connected to each other. The tie rod simultaneously provides cooling fluid to the shaft core and exits the cooling fluid, further achieving a compact structure and improving the cooling performance of the shaft core.

[0070] In some implementations... It also includes a shaft core sleeve 4 and a fastening ring 5. The shaft core sleeve 4 is sleeved on the outer periphery of the shaft core 1, and the shaft core sleeve 4 is opposite to the first communicating channel 13 in the radial direction of the shaft core 1 so as to seal the first communicating channel 13. The fastening ring 5 is also sleeved on the outer periphery of the shaft core 1, and the fastening ring 5 abuts against one axial end of the shaft core sleeve 4.

[0071] This utility model also achieves a sealing effect on the first, third, fifth and seventh connecting channels through the structure of the shaft core sleeve, ensuring that the cooling fluid inside the shaft core will not leak, thus improving the cooling performance of the shaft core. The fastening ring can achieve a fastening effect on the shaft core sleeve, preventing loosening, further improving the sealing performance of the shaft core cooling channel and improving the cooling performance.

[0072] The electric spindle core cooling structure provided by this utility model introduces the central water outlet channel on the tie rod into the core, allowing the cutting fluid in the central water outlet channel to flow back and forth on the core to complete the cooling of the core, and finally flow back to the tie rod for discharge, eliminating the need for additional external pipes for core cooling. Several circumferentially distributed DC channels are opened on the core. The waist-shaped grooves (including the first to seventh connecting channels) on both sides of the core are sequentially connected to the DC channels to achieve reciprocating cooling channels. The left waist-shaped groove (including the first, third, fifth and seventh connecting channels) is opened radially on the core located on the left side of the motor rotor. The core water sleeve (i.e., the core sheath 4) is installed on the left waist-shaped groove and presses the sealing rings on both sides to form a seal. The core water sleeve is locked from right to left using nuts (fastening rings 5). The right waist-shaped groove (including the second, fourth and sixth connecting channels) is opened axially on the rear end cover of the core. Each right waist-shaped groove is designed with a sealing ring. The rear end cover of the core is locked to the right side of the core using screws. By using a simple structural design, the cutting fluid from the center outlet can be guided to the spindle core for reciprocating flow, which carries away the heat of the spindle core and achieves spindle core cooling, thereby reducing the temperature rise inside the electric spindle and improving the performance of the electric spindle.

[0073] In some implementations... It also includes a shaft core positioning key 2. A portion of the inner circumference of the shaft core 1 has a tapered hole 34. The shaft core positioning key 2 is disposed in the tapered hole 34. The shaft core positioning key 2 includes an annular body 35, a first key 36, a second key 37, and a spring hole 38. The first key 36 is disposed on one axial end face of the annular body 35 and protrudes a first length along the axial direction of the annular body 35. The second key 37 is also disposed on one axial end face of the annular body 35 and protrudes a second length along the axial direction of the annular body 35. The first length is greater than the second length. The annular body 35 is also provided with the spring hole 38 penetrating both axial end faces. A spring pin 3 can be disposed in the spring hole 38.

[0074] This invention also improves the positioning performance of the tapered hole by setting the aforementioned shaft core positioning key as first and second keys with unequal axial lengths. This invention integrates the high key and the low key into a single tapered hole positioning key. The tapered hole positioning key containing the high and low keys is positioned by elastic pins and fixedly assembled to the shaft core tapered hole by screws. This solution can reduce the machining difficulty of the shaft core tapered hole.

[0075] This utility model also provides an electric spindle, which includes the aforementioned spindle core cooling assembly.

[0076] This invention utilizes several circumferentially distributed DC channels on the spindle core. Waist-shaped grooves on both sides of the spindle core sequentially connect to these DC channels, creating a reciprocating cooling flow path. The left waist-shaped groove is radially located on the spindle core to the left of the motor rotor. A spindle core water sleeve is installed on the left waist-shaped groove, pressing against the sealing rings on both sides to form a seal. Nuts are used to lock the spindle core water sleeve from right to left. The right waist-shaped groove is axially located on the spindle core end cover. Each right waist-shaped groove is designed with a second sealing ring groove. Screws are used to lock the rear end cover (spindle core end cover 9) to the right side of the spindle core, forming a seal under the sealing rings. The spindle core is cooled by introducing a central water outlet channel on the tie rod into the spindle core, causing the cutting fluid in the central water outlet channel to reciprocate on the spindle core, thus cooling it before finally flowing to the tie rod for discharge. Without the need for additional external piping for spindle cooling, a simple structural design can guide the cutting fluid from the center outlet to the spindle for reciprocating flow, carrying away the spindle heat and achieving spindle cooling. This reduces the internal temperature rise of the electric spindle and improves its performance.

[0077] The improvement of this utility model is as follows: 1. The present invention features a multi-segment reciprocating cooling channel on the shaft core, which enhances the cooling effect on the shaft core.

[0078] 2. In this utility model, the inlet flow channels on the pull rod are all opened on the right side of the elastic element 7, and the outlet flow channel extends to the left side of the elastic element. The inlet and outlet flow channels are not connected, thus avoiding direct connection between the two central water outlet flow channels.

[0079] 3. The left waist-shaped groove (the first, third, fifth and seventh connecting channels) of this utility model is radially opened on the shaft core 1 located on the left side of the motor rotor 6. The shaft core sleeve 4 is installed on the left waist-shaped groove to press the sealing rings on both sides to form a seal. The shaft core sleeve 4 is locked from right to left with a nut. The structure is compact.

[0080] 4. The right-side waist-shaped groove (the second, fourth and sixth connecting channels) of this utility model is axially opened on the rear end cover of the shaft core (shaft core end cover 9). Each right-side waist-shaped groove is designed with a sealing ring groove. The rear end cover of the shaft core is locked to the right side of the shaft core by screws to form a seal.

[0081] 5. In this utility model, the high key and low key on the tapered hole positioning key are made into an integral part. The tapered hole positioning key, which includes the high and low keys, is positioned by elastic pins and fixedly assembled to the tapered hole of the shaft core by screws. This solution can reduce the machining difficulty of the tapered hole of the shaft core.

[0082] The beneficial effects of this utility model are: 1. The spindle cooling function of this utility model utilizes the center water outlet function. The cutting fluid from the center outlet is introduced into the spindle through the tie rod and flows back and forth to cool the spindle, forming multiple reciprocating flow channels to improve the cooling effect. Finally, the fluid is discharged through the tie rod.

[0083] 2. In this utility model, the high key and low key on the tapered hole positioning key are made into an integrated part. The method of assembling the tapered hole positioning key containing the high and low keys into the tapered hole of the shaft core can reduce the machining difficulty of the tapered hole of the shaft core.

[0084] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A spindle core cooling assembly, characterized in that: include: The shaft core (1) has a first flow channel (11), a second flow channel (12) and a first connecting channel (13). The first connecting channel (13) connects the first flow channel (11) and the second flow channel (12). Along the direction of fluid flow, the first flow channel (11), the first connecting channel (13) and the second flow channel (12) are connected in sequence. The flow direction of the cooling fluid in the first flow channel (11) is opposite to the flow direction of the cooling fluid in the second flow channel (12).

2. The spindle core cooling assembly according to claim 1, characterized in that: The first flow channel (11) and the second flow channel (12) are both located between the inner wall and the outer wall of the shaft core (1), and the first flow channel (11) and the second flow channel (12) are both direct current channels extending along the axial direction of the shaft core (1); One axial end of the shaft core (1) is the inlet end of the cooling fluid, and the other axial end of the shaft core (1) is the outlet end of the cooling fluid. The direction from one axial end of the shaft core (1) to the other axial end is defined as the first axial direction, and the direction from the other axial end to one axial end is defined as the second axial direction. The flow direction of the fluid in the first flow channel (11) is along the first axial direction, and the flow direction of the fluid in the second flow channel (12) is along the second axial direction. The first flow channel (11) and the second flow channel (12) are channels located at different circumferential positions on the shaft core (1).

3. The spindle core cooling assembly according to claim 1, characterized in that: The first connecting channel (13) is disposed on the shaft core (1) and includes an arc-shaped channel. The arc-shaped channel of the first connecting channel (13) is located on the outer wall of the shaft core (1) and extends along the circumference of the shaft core (1). The first connecting channel (13) connects the outlet end of the first flow channel (11) with the inlet end of the second flow channel (12). The outer wall of the shaft core (1) is provided with first sealing ring grooves (39) on both axial sides of the first connecting channel (13). A sealing ring can be disposed in the first sealing ring groove (39).

4. The spindle core cooling assembly according to claim 1, characterized in that: It also includes an outflow channel (14), which is also opened on the shaft core (1). The outflow channel (14) can communicate with the second flow channel (12), and the outflow channel (14) can discharge cooling fluid out of the shaft core (1).

5. The spindle core cooling assembly according to claim 4, characterized in that: It also includes a third flow channel (15), a second connecting channel (16), a fourth flow channel (17) and a third connecting channel (18), wherein the third flow channel (15), the second connecting channel (16), the fourth flow channel (17) and the third connecting channel (18) are connected between the second flow channel (12) and the outflow channel (14); The second connecting channel (16) is connected between the second flow channel (12) and the third flow channel (15). Along the direction of fluid flow, the second flow channel (12), the second connecting channel (16) and the third flow channel (15) are connected in sequence. The flow direction of the cooling fluid in the second flow channel (12) is opposite to the flow direction of the cooling fluid in the third flow channel (15). The third connecting channel (18) is connected between the third flow channel (15) and the fourth flow channel (17). Along the direction of fluid flow, the third flow channel (15), the third connecting channel (18) and the fourth flow channel (17) are connected in sequence. The flow direction of the cooling fluid in the third flow channel (15) is opposite to the flow direction of the cooling fluid in the fourth flow channel (17).

6. The spindle core cooling assembly according to claim 5, characterized in that: The third flow channel (15) and the fourth flow channel (17) are both located between the inner wall and the outer wall of the shaft core (1), and the third flow channel (15) and the fourth flow channel (17) are both direct current channels extending along the axial direction of the shaft core (1); One axial end of the shaft core (1) is the inlet end of the cooling fluid, and the other axial end of the shaft core (1) is the outlet end of the cooling fluid. The direction from one axial end of the shaft core (1) to the other axial end is defined as the first axial direction, and the direction from the other axial end to one axial end is defined as the second axial direction. The flow direction of the fluid in the third flow channel (15) is along the first axial direction, and the flow direction of the fluid in the fourth flow channel (17) is along the second axial direction. The third flow channel (15) and the fourth flow channel (17) are channels located at different circumferential positions on the shaft core (1).

7. The spindle core cooling assembly according to claim 5, characterized in that: It also includes a shaft end cap (9), which is disposed at one axial end of the shaft (1). The outlet end of the second flow channel (12) extends to a position connected with the shaft end cap (9), and the inlet end of the third flow channel (15) also extends to a position connected with the shaft end cap (9). The second connecting channel (16) is an arc-shaped channel disposed on the end face of the shaft end cap (9). The second connecting channel (16) connects the outlet end of the second flow channel (12) with the inlet end of the third flow channel (15). A second sealing ring groove (40) is provided on the outer periphery of the second connecting channel (16), and a sealing ring can be disposed in the second sealing ring groove (40). The third connecting channel (18) is disposed on the shaft core (1) and includes an arc-shaped channel. The arc-shaped channel of the third connecting channel (18) is located on the outer wall of the shaft core (1) and extends along the circumference of the shaft core (1). The third connecting channel (18) connects the outlet end of the third flow channel (15) with the inlet end of the fourth flow channel (17). The outer wall of the shaft core (1) is provided with first sealing ring grooves (39) on both axial sides of the third connecting channel (18). A sealing ring can be disposed in the first sealing ring groove (39).

8. The spindle core cooling assembly according to claim 5, characterized in that: It also includes a fifth flow channel (19), a fourth connecting channel (20), a sixth flow channel (21) and a fifth connecting channel (22), wherein the fifth flow channel (19), the fourth connecting channel (20), the sixth flow channel (21) and the fifth connecting channel (22) are connected between the fourth flow channel (17) and the outflow channel (14); The fourth connecting channel (20) is connected between the fourth flow channel (17) and the fifth flow channel (19). Along the direction of fluid flow, the fourth flow channel (17), the fourth connecting channel (20) and the fifth flow channel (19) are connected in sequence. The flow direction of the cooling fluid in the fourth flow channel (17) is opposite to the flow direction of the cooling fluid in the fifth flow channel (19). The fifth connecting channel (22) is connected between the fifth flow channel (19) and the sixth flow channel (21). Along the direction of fluid flow, the fifth flow channel (19), the fifth connecting channel (22) and the sixth flow channel (21) are connected in sequence. The flow direction of the cooling fluid in the fifth flow channel (19) is opposite to the flow direction of the cooling fluid in the sixth flow channel (21).

9. The spindle core cooling assembly according to claim 8, characterized in that: The fifth flow channel (19) and the sixth flow channel (21) are both located between the inner wall and the outer wall of the shaft core (1), and the fifth flow channel (19) and the sixth flow channel (21) are both direct current channels extending along the axial direction of the shaft core (1); One axial end of the shaft core (1) is the inlet end of the cooling fluid, and the other axial end of the shaft core (1) is the outlet end of the cooling fluid. The direction from one axial end of the shaft core (1) to the other axial end is defined as the first axial direction, and the direction from the other axial end to one axial end is defined as the second axial direction. The flow direction of the fluid in the fifth flow channel (19) is along the first axial direction, and the flow direction of the fluid in the sixth flow channel (21) is along the second axial direction. The fifth flow channel (19) and the sixth flow channel (21) are channels located at different circumferential positions on the shaft core (1).

10. The spindle core cooling assembly according to claim 8, characterized in that: It also includes a shaft end cap (9), which is disposed at one axial end of the shaft (1). The outlet end of the fourth flow channel (17) extends to a position connected with the shaft end cap (9), and the inlet end of the fifth flow channel (19) also extends to a position connected with the shaft end cap (9). The fourth connecting channel (20) is an arc-shaped channel disposed on the end face of the shaft end cap (9). The fourth connecting channel (20) connects the outlet end of the fourth flow channel (17) with the inlet end of the fifth flow channel (19). A second sealing ring groove (40) is provided on the outer periphery of the fourth connecting channel (20), and a sealing ring can be disposed in the second sealing ring groove (40). The fifth connecting channel (22) is disposed on the shaft core (1) and includes an arc-shaped channel. The arc-shaped channel of the fifth connecting channel (22) is located on the outer wall of the shaft core (1) and extends along the circumference of the shaft core (1). The fifth connecting channel (22) connects the outlet end of the fifth flow channel (19) with the inlet end of the sixth flow channel (21). The outer wall of the shaft core (1) is provided with first sealing ring grooves (39) on both axial sides of the fifth connecting channel (22). A sealing ring can be disposed in the first sealing ring groove (39).

11. The spindle core cooling assembly according to claim 8, characterized in that: The shaft core (1) is also provided with a seventh flow channel (23), a sixth connecting channel (24) and a seventh connecting channel (25), the seventh flow channel (23), the sixth connecting channel (24) and the seventh connecting channel (25) are connected between the sixth flow channel (21) and the outflow channel (14); The sixth connecting channel (24) is connected between the sixth flow channel (21) and the seventh flow channel (23). Along the direction of fluid flow, the sixth flow channel (21), the sixth connecting channel (24) and the seventh flow channel (23) are connected in sequence. The flow direction of the cooling fluid in the sixth flow channel (21) is opposite to the flow direction of the cooling fluid in the seventh flow channel (23). The seventh connecting channel (25) is connected between the seventh flow channel (23) and the outflow channel (14). Along the direction of fluid flow, the seventh flow channel (23), the seventh connecting channel (25) and the outflow channel (14) are connected in sequence. The flow direction of the cooling fluid in the seventh flow channel (23) is opposite to the flow direction of the cooling fluid in the outflow channel (14).

12. The spindle core cooling assembly according to claim 11, characterized in that: The seventh flow channel (23) and the outflow channel (14) are both located between the inner wall and the outer wall of the shaft core (1). The seventh flow channel (23) and the outflow channel (14) are both direct current channels extending along the axial direction of the shaft core (1). One axial end of the shaft core (1) is the inlet end of the cooling fluid, and the other axial end of the shaft core (1) is the outlet end of the cooling fluid. The direction from one axial end of the shaft core (1) to the other axial end is defined as the first axial direction, and the direction from the other axial end to one axial end is defined as the second axial direction. The flow direction of the fluid in the seventh flow channel (23) is along the first axial direction, and the flow direction of the fluid in the outlet channel (14) is along the second axial direction. The seventh flow channel (23) and the outlet channel (14) are channels located at different circumferential positions on the shaft core (1).

13. The spindle core cooling assembly according to claim 11, characterized in that: It also includes a shaft end cap (9), which is disposed at one axial end of the shaft (1). The outlet end of the sixth flow channel (21) extends to a position connected with the shaft end cap (9), and the inlet end of the seventh flow channel (23) also extends to a position connected with the shaft end cap (9). The sixth connecting channel (24) is an arc-shaped channel disposed on the end face of the shaft end cap (9). The sixth connecting channel (24) connects the outlet end of the sixth flow channel (21) with the inlet end of the seventh flow channel (23). A second sealing ring groove (40) is provided on the outer periphery of the sixth connecting channel (24), and a sealing ring can be disposed in the second sealing ring groove (40). The seventh connecting channel (25) is disposed on the shaft core (1) and includes an arc-shaped channel. The arc-shaped channel of the seventh connecting channel (25) is located on the outer wall of the shaft core (1) and extends along the circumference of the shaft core (1). The seventh connecting channel (25) connects the outlet end of the seventh flow channel (23) with the inlet end of the outflow channel (14). The outer wall of the shaft core (1) is provided with first sealing ring grooves (39) on both axial sides of the seventh connecting channel (25). A sealing ring can be disposed in the first sealing ring groove (39).

14. The spindle core cooling assembly according to claim 4, characterized in that: It also includes a pull rod (8), which passes through the inside of the shaft core (1), and the inside of the pull rod (8) is provided with an inlet flow channel (26), an outlet flow channel (27), a first intermediate flow channel (28) and a second intermediate flow channel (29). The inlet flow channel (26) can communicate with the first flow channel (11) through the first intermediate flow channel (28) so that cooling fluid can be introduced into the first flow channel (11) inside the shaft core (1) through the inlet flow channel (26); The outlet flow channel (27) can be connected to the outflow channel (14) through the second intermediate flow channel (29) so that the cooling fluid inside the shaft core (1) can be discharged through the outlet flow channel (27).

15. The spindle core cooling assembly according to claim 14, characterized in that: The inlet channel (26) is a straight channel extending along the axial direction of the pull rod (8), that is, the extension direction of the inlet channel (26) is parallel to the axial direction of the pull rod (8), and the outlet channel (27) is also a straight channel extending along the axial direction of the pull rod (8), that is, the extension direction of the outlet channel (27) is parallel to the axial direction of the pull rod (8). One end of the inlet channel (26) is located at one axial end of the pull rod (8), and the other end of the inlet channel (26) extends toward the interior of the pull rod (8) to a first position. One end of the outlet channel (27) is located at the other axial end of the pull rod (8), and the other end of the outlet channel (27) extends toward the interior of the pull rod (8) to a second position. The first position and the second position are spaced apart by a preset distance greater than 0.

16. The spindle core cooling assembly according to claim 14, characterized in that: It also includes a third intermediate flow channel (30), a fourth intermediate flow channel (31), a first annular flow channel (32), and a second annular flow channel (33). One end of the first intermediate flow channel (28) is connected to the inlet flow channel (26), and the other end of the first intermediate flow channel (28) is connected to the first annular flow channel (32). One end of the third intermediate flow channel (30) is connected to the first annular flow channel (32), and the other end of the third intermediate flow channel (30) is connected to the first flow channel (11). One end of the second intermediate flow channel (29) is connected to the outlet flow channel (27), and the other end of the second intermediate flow channel (29) is connected to the second annular flow channel (33). One end of the fourth intermediate flow channel (31) is connected to the second annular flow channel (33), and the other end of the fourth intermediate flow channel (31) is connected to the outflow channel (14).

17. The spindle core cooling assembly according to claim 16, characterized in that: The third intermediate flow channel (30) and the fourth intermediate flow channel (31) are both opened on the inner wall of the shaft core (1), the first annular flow channel (32) and the second annular flow channel (33) are both opened on the outer wall of the pull rod (8), and the first annular flow channel (32) and the second annular flow channel (33) are spaced apart by a preset distance greater than 0 along the axial direction of the shaft core (1).

18. The spindle core cooling assembly according to claim 1, characterized in that: It also includes a shaft core sleeve (4) and a fastening ring (5). The shaft core sleeve (4) is fitted around the outer periphery of the shaft core (1), and the shaft core sleeve (4) is opposite to the first connecting channel (13) in the radial direction of the shaft core (1) so as to seal the first connecting channel (13). The fastening ring (5) is also fitted around the outer periphery of the shaft core (1), and the fastening ring (5) abuts against one axial end of the shaft core sleeve (4).

19. The spindle core cooling assembly according to claim 1, characterized in that: It also includes a shaft core positioning key (2), a portion of the inner circumference of the shaft core (1) has a tapered hole (34), the shaft core positioning key (2) is disposed in the tapered hole (34), the shaft core positioning key (2) includes an annular body (35), a first key (36), a second key (37) and a spring hole (38), the first key (36) is disposed on one axial end face of the annular body (35) and protrudes a first length along the axial direction of the annular body (35), the second key (37) is also disposed on one axial end face of the annular body (35) and protrudes a second length along the axial direction of the annular body (35), the first length is greater than the second length, and the annular body (35) is also provided with the spring hole (38) penetrating both axial end faces, and a spring pin (3) can be disposed in the spring hole (38).

20. An electric spindle, characterized in that: Includes the spindle core cooling assembly as described in any one of claims 1-19.

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