Three-way rotary joint capable of being applied to high-speed motorized spindle

Abstract

The invention discloses a three-way rotary joint capable of being applied to a high-speed motorized spindle, comprising a fixed part which comprises a main body, a first static sealing component and a second static sealing component, and the first static sealing component and the second static sealing component are assembled on the main body in a floating manner but not in a rotating manner; a central water outlet fixed flow channel, a cooling inlet fixed flow channel and a cooling outlet fixed flow channel are arranged on the main body; the rotating shaft is rotationally assembled on the main body, and the rotating shaft is provided with a central water outlet rotating flow channel, a cooling inlet rotating flow channel and a cooling outlet rotating flow channel; the first elastic component can provide axial force to drive the first static sealing component to be pressed on the first dynamic sealing end of the rotating shaft to form contact sealing, so that the central water outlet fixed flow channel is communicated with the central water outlet rotating flow channel, and meanwhile, the cooling inlet fixed flow channel is communicated with the cooling inlet rotating flow channel; and the second elastic component can provide axial force to drive the second static sealing component to be pressed on the second dynamic sealing end of the rotating shaft to form contact sealing, so that the cooling outlet fixed flow channel communicates with the cooling outlet rotating flow channel. Therefore, the requirements of water outlet and cooling of the center of the motorized spindle are met simultaneously.

Description

Technical Field

[0001] The invention relates to the technical field of rotary joints, and in particular to a three-way rotary joint applicable to a high-speed electric spindle. Background Art

[0002] A rotary joint is a connection and sealing device used to transfer media from a static system to a dynamic rotating system. Currently, most of the widely used rotary joints are single-channel type. When applied to an electric spindle, they are mainly connected to the core shaft of the electric spindle to achieve the central water outlet function.

[0003] During the use of the electric spindle, the motor and bearings as heat sources will generate heat, causing thermal expansion and affecting the machining accuracy of the electric spindle. Therefore, in the structural design of the electric spindle, it is necessary to consider the cooling of the electric spindle mandrel to reduce the impact of thermal expansion. However, due to the limitation of the number of channels, the existing single-channel rotary joint cannot simultaneously meet the dual needs of the electric spindle center water outlet and mandrel cooling. Summary of the invention

[0004] The invention provides a three-way rotary joint applicable to a high-speed electric spindle, so as to simultaneously meet the requirements of central water outlet and core shaft cooling of the electric spindle.

[0005] In order to achieve the above object, the technical solution of the present invention is:

[0006] A three-way rotary joint applicable to a high-speed electric spindle comprises:

[0007] The fixed part comprises a main body, a first static sealing component and a second static sealing component, wherein the first static sealing component and the second static sealing component are assembled on the main body in a floating manner but not in a rotational manner, and the main body is provided with a central water outlet fixed flow channel, a cooling inlet fixed flow channel and a cooling outlet fixed flow channel;

[0008] A rotating shaft is rotatably mounted on the main body, and a central water outlet rotating flow channel, a cooling inlet rotating flow channel and a cooling outlet rotating flow channel are provided on the rotating shaft;

[0009] The first elastic component is capable of providing an axial force to drive the first static sealing component to press against the first dynamic sealing end of the rotating shaft, so that the end of the first static sealing component and the end of the first dynamic sealing end fit together to form a contact seal, so that the central water outlet fixed flow channel is connected to the central water outlet rotating flow channel, and at the same time, the cooling inlet fixed flow channel is connected to the cooling inlet rotating flow channel;

[0010] The second elastic component can provide axial force to drive the second static sealing component to press on the second dynamic sealing end of the rotating shaft, so that the end of the second static sealing component and the end of the second dynamic sealing end fit together to form a contact seal, so that the cooling outlet fixed flow channel and the cooling outlet rotating flow channel are connected.

[0011] Furthermore, a receiving cavity is provided in the main body, and the first dynamic sealing end is located in the receiving cavity;

[0012] The first dynamic sealing end divides the accommodating cavity into a first distribution cavity and a second distribution cavity. The cooling inlet fixed flow channel is connected to the cooling inlet rotating flow channel through the first distribution cavity. The cooling outlet fixed flow channel is connected to the cooling outlet rotating flow channel through the second distribution cavity.

[0013] Furthermore, a rotation gap is left between the first dynamic seal end and the inner wall of the main body, the rotation gap is located between the first distribution chamber and the second distribution chamber, the two ends of the rotation gap are connected to the first distribution chamber and the second distribution chamber respectively, and a sealing structure is provided in the rotation gap.

[0014] Further, the sealing structure is a wear-resistant ring;

[0015] Alternatively, the sealing structure is a sealing groove, and a flow cross-sectional area of ​​the sealing groove is larger than a flow cross-sectional area of ​​the rotating gap.

[0016] Furthermore, the cooling inlet rotating flow channel is provided with a transition section inclined toward the cooling inlet fixed flow channel, and the first static sealing component located in the first distribution chamber is provided with a step portion, and the coolant flowing from the cooling inlet fixed flow channel into the first distribution chamber changes direction at the step portion and then flows into the transition section.

[0017] Furthermore, the second distribution chamber is provided with a guide slope, which is located at the end of the rotating gap close to one end of the second distribution chamber, and is used to guide the fluid away from the rotating gap and flow toward the cooling outlet fixed flow channel.

[0018] Furthermore, a third ceramic ring is provided at the end of the first dynamic sealing end, a first ceramic ring is provided at the end of the first static sealing component and is arranged opposite to the third ceramic ring, a fourth ceramic ring is provided at the end of the second dynamic sealing end, and a second ceramic ring is provided at the end of the second static sealing component and is arranged opposite to the fourth ceramic ring.

[0019] Furthermore, the main body includes a fixing seat and a cooling jacket, the cooling jacket is fixed on the fixing seat, and the cooling jacket and the fixing seat form a receiving cavity;

[0020] The fixing seat is provided with a central water outlet fixed flow channel, the first static sealing component is assembled on the fixing seat in a floating manner but not in a rotational manner, the first static sealing component is provided with a first through hole connected to the central water outlet fixed flow channel, and the first static sealing component is provided with a first ceramic ring at the end of the first through hole;

[0021] The cooling jacket is provided with a cooling inlet fixed flow channel and a cooling outlet fixed flow channel, the second static sealing component is assembled on the cooling jacket in a floating manner but not in a rotational manner, the second static sealing component is provided with a second through hole connected with the cooling outlet fixed flow channel, and the second static sealing component is provided with a second ceramic ring at an end of the second through hole;

[0022] A rotating shaft, comprising a connecting rod and a rotating ring, wherein the connecting rod is rotatably mounted on the cooling jacket, and the rotating ring is fixed on the connecting rod;

[0023] The connecting rod is provided with a central water outlet rotating flow channel and a cooling inlet rotating flow channel, and the connecting rod is provided with a third ceramic ring arranged opposite to the first ceramic ring, and one end of the connecting rod provided with the third ceramic ring is a first dynamic sealing end;

[0024] The rotating ring and the connecting rod form a cooling outlet rotating flow channel, the rotating ring is provided with a fourth ceramic ring arranged opposite to the second ceramic ring, and one end of the rotating ring provided with the fourth ceramic ring is a second dynamic sealing end;

[0025] The first elastic component can provide an axial force to drive the first ceramic ring to press on the third ceramic ring, so that the first ceramic ring and the third ceramic ring fit tightly together, so that the central water outlet fixed flow channel is connected with the central water outlet rotating flow channel through the first through hole, and at the same time, the cooling inlet fixed flow channel is connected with the cooling inlet rotating flow channel;

[0026] The second elastic component can provide axial force to drive the second ceramic ring to press on the fourth ceramic ring, so that the second ceramic ring and the fourth ceramic ring fit tightly, so that the cooling outlet fixed flow channel is connected with the cooling outlet rotating flow channel through the second through hole.

[0027] Further, the first elastic component is a first spring, and the first spring is placed between the main body and the first static sealing component;

[0028] The second elastic component is a second spring, and the second spring is disposed between the main body and the second static sealing component.

[0029] Furthermore, it also includes a first guide column and a second guide column arranged on the main body, the first guide column and the second guide column extend along the axial direction of the rotating shaft, the first static sealing component is provided with a first guide hole corresponding to the first guide column, and the second static sealing component is provided with a second guide hole corresponding to the second guide column.

[0030] Beneficial effects:

[0031] The three-way rotary joint disclosed in the present invention can be applied to a high-speed electric spindle. A first elastic component and a second elastic component are arranged to provide an axial force, so that the first static sealing component and the second static sealing component on the driving body are respectively pressed against the first dynamic sealing end and the second dynamic sealing end of the rotating shaft, so that a contact seal is formed between the fixed portion and the rotating shaft, thereby connecting the central water outlet fixed flow channel and the central water outlet rotating flow channel, the cooling inlet fixed flow channel and the cooling inlet rotating flow channel, and the cooling outlet fixed flow channel and the cooling outlet rotating flow channel, thereby forming a flow channel for central water outlet and an inlet flow channel and an outlet flow channel for core shaft cooling, so as to simultaneously meet the dual needs of central water outlet and core shaft cooling of the electric spindle. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a structural schematic diagram of a three-way rotary joint applicable to a high-speed electric spindle disclosed in the present invention;

[0034] Figure 2 It is a left view of the three-way rotary joint disclosed in the present invention and applicable to the high-speed electric spindle;

[0035] Figure 3 It is a right view of the three-way rotary joint disclosed in the present invention and applicable to the high-speed electric spindle;

[0036] Figure 4 It is a structural schematic diagram of the fixing part of the three-way rotary joint disclosed in the present invention and applicable to the high-speed electric spindle;

[0037] Figure 5 It is a schematic structural diagram of a rotating shaft of a three-way rotating joint applicable to a high-speed electric spindle disclosed in the present invention;

[0038] Figure 6 for Figure 3 AA section view;

[0039] Figure 7 It is a fluid schematic diagram of a three-way rotary joint applicable to a high-speed electric spindle disclosed in the present invention;

[0040] Figure 8 for Figure 7 Enlarged view of point B.

[0041] In the figure:

[0042] 1. Fixed seat; 101. Center water outlet fixed flow channel;

[0043] 2. Cooling jacket; 201. Cooling inlet fixed flow channel; 202. Cooling outlet fixed flow channel;

[0044] 3. First static sealing component; 301. First through hole;

[0045] 4. second static sealing component; 401. second through hole;

[0046] 5. The first ceramic ring;

[0047] 6. Second ceramic ring;

[0048] 7. Connecting rod; 701. Central water outlet rotating flow channel; 702. Cooling inlet rotating flow channel; 7021. Transition section;

[0049] 8. Rotating ring;

[0050] 9. The third ceramic ring;

[0051] 10. Cooling outlet rotating flow channel;

[0052] 11. Fourth ceramic ring;

[0053] 12. First spring;

[0054] 13. Second spring;

[0055] 14. A first guide column;

[0056] 15. Second guide column;

[0057] 16. Rotational clearance;

[0058] 17. Guide slope;

[0059] 18. Sealing structure;

[0060] 19. The ball rises and blocks the head;

[0061] 20. O-ring;

[0062] 21. Step part;

[0063] C, first distribution chamber; D, second distribution chamber. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0065] Example 1

[0066] This embodiment provides a three-way rotary joint that can be applied to a high-speed electric spindle, such as Figure 6 and Figure 7 As shown, including:

[0067] The fixed part includes a main body, a first static sealing component 3 and a second static sealing component 4, wherein the first static sealing component 3 and the second static sealing component 4 are assembled on the main body in a floating manner but not in a rotational manner, and the main body is provided with a central water outlet fixed flow channel 101, a cooling inlet fixed flow channel 201 and a cooling outlet fixed flow channel 202;

[0068] A rotating shaft, rotatably mounted on the main body, wherein the rotating shaft is provided with a central water outlet rotating channel 701, a cooling inlet rotating channel 702 and a cooling outlet rotating channel 10;

[0069] The first elastic component can provide an axial force to drive the first static sealing component 3 to press against the first dynamic sealing end of the rotating shaft, so that the end of the first static sealing component 3 and the end of the first dynamic sealing end fit together to form a contact seal, so that the central water outlet fixed flow channel 101 and the central water outlet rotating flow channel 701 are connected, and at the same time, the cooling inlet fixed flow channel 201 and the cooling inlet rotating flow channel 702 are connected;

[0070] The second elastic component can provide an axial force to drive the second static sealing component 4 to press against the second dynamic sealing end of the rotating shaft, so that the end of the second static sealing component 4 fits with the end of the second dynamic sealing end to form a contact seal, so that the cooling outlet fixed flow channel 202 is connected to the cooling outlet rotating flow channel 10;

[0071] The three-way rotary joint provided in this embodiment can be applied to high-speed electric spindles. By arranging a first elastic component and a second elastic component to provide axial force, the first static sealing component 3 and the second static sealing component 4 on the driving body are respectively pressed against the first dynamic sealing end and the second dynamic sealing end of the rotating shaft, so that a contact seal is formed between the fixed part and the rotating shaft, so that the center water outlet fixed flow channel 101 and the center water outlet rotating flow channel 701, the cooling inlet fixed flow channel 201 and the cooling inlet rotating flow channel 702 are connected, and the cooling outlet fixed flow channel 202 and the cooling outlet rotating flow channel 10 are connected, thereby forming a flow channel for center water outlet and an inlet flow channel and an outlet flow channel for core shaft cooling, so as to simultaneously meet the dual needs of center water outlet and core shaft cooling of the electric spindle.

[0072] In a specific embodiment, a receiving cavity is provided in the main body, and the first dynamic sealing end is located in the receiving cavity;

[0073] The first dynamic sealing end divides the accommodating cavity into a first distribution cavity C and a second distribution cavity D. The cooling inlet fixed flow channel 201 is connected to the cooling inlet rotating flow channel 702 through the first distribution cavity C, and the cooling outlet fixed flow channel 202 is connected to the cooling outlet rotating flow channel 10 through the second distribution cavity D.

[0074] Through the first distribution chamber C and the second distribution chamber D, the coolant flowing in from several cooling inlet fixed flow channels 201 can be evenly distributed to several cooling inlet rotating flow channels 702, and the coolant flowing in from several cooling outlet rotating flow channels 10 can be evenly distributed to several cooling outlet fixed flow channels 202.

[0075] In a specific embodiment, Figure 8 As shown, a rotation gap 16 is left between the first dynamic seal end and the inner wall of the main body, and the rotation gap 16 is located between the first distribution chamber C and the second distribution chamber D. The two ends of the rotation gap 16 are connected to the first distribution chamber C and the second distribution chamber D respectively, and a sealing structure 18 is provided in the rotation gap 16;

[0076] By providing the rotation gap 16, it is ensured that the first dynamic sealing end of the rotating shaft can rotate relative to the main body, and by providing the sealing structure 18, the relative flow of the coolant in the first distribution chamber C and the coolant in the second distribution chamber D is reduced.

[0077] In a specific embodiment, the sealing structure 18 is a wear-resistant ring. In this embodiment, a groove for installing the wear-resistant ring is provided on the cooling jacket 2 of the main body, and the wear-resistant ring forms a contact seal between the fixing seat 1 of the main body and the cooling jacket 2.

[0078] In a specific embodiment, Figure 8As shown, the cooling inlet rotating flow channel 702 is provided with a transition section 7021 inclined toward the cooling inlet fixed flow channel 201, and the first static sealing component 3 located in the first distribution chamber C is provided with a step portion 21. The coolant flowing from the cooling inlet fixed flow channel 201 into the first distribution chamber C is reversed by the step portion 21 and then flows into the transition section 7021, ensuring that the coolant flows more smoothly. At the same time, when the coolant flows from the cooling inlet rotating flow channel 702 into the first distribution chamber C, direct impact on the fitting part of the first static sealing component 3 and the first dynamic sealing end is avoided to avoid affecting the sealing effect.

[0079] In a specific embodiment, Figure 8 As shown, the second distribution chamber D is provided with a guide bevel 17, and the guide bevel 17 is located at the end of the rotating gap 16 close to one end of the second distribution chamber D. The guide bevel is used to guide the fluid away from the rotating gap 16 and flow toward the cooling outlet fixed flow channel 202, so that the flow of the coolant is smoother, and at the same time, the coolant flowing into the second distribution chamber D from the cooling outlet rotating flow channel 10 does not flow directly to the rotating gap 16, thereby reducing the flow rate of the coolant flowing from the second distribution chamber D to the first distribution chamber C.

[0080] In a specific embodiment, Figure 6 As shown, a third ceramic ring 9 is provided at the end of the first dynamic sealing end, a first ceramic ring 5 is provided at the end of the first static sealing component 3 and is arranged opposite to the third ceramic ring 9, a fourth ceramic ring 11 is provided at the end of the second dynamic sealing end, and a second ceramic ring 6 is provided at the end of the second static sealing component 4 and is arranged opposite to the fourth ceramic ring 11;

[0081] Under the action of the axial force provided by the elastic component, the ceramic rings that fit tightly together show a good sealing effect, and the excellent wear resistance of the ceramic rings makes them suitable for high-speed electric spindles.

[0082] In a specific embodiment, Figures 1 to 6 As shown, the main body includes a fixing seat 1 and a cooling jacket 2, the cooling jacket 2 is fixed to the fixing seat 1 by bolts, and the cooling jacket 2 and the fixing seat 1 form a receiving cavity;

[0083] The fixing seat 1 is provided with a central water outlet fixed flow channel 101, the first static sealing component 3 is assembled on the fixing seat 1 in a floating manner but not in a rotational manner, the first static sealing component 3 is provided with a first through hole 301 connected to the central water outlet fixed flow channel 101, the first static sealing component 3 is provided with a first ceramic ring 5 at the end of the first through hole 301, and in this embodiment, the first ceramic ring 5 is embedded in a groove provided on the first static sealing component 3;

[0084] The cooling jacket 2 is provided with a cooling inlet fixed flow channel 201 and a cooling outlet fixed flow channel 202. The second static sealing component 4 is assembled on the cooling jacket 2 in a floating manner but not in a rotational manner. The second static sealing component 4 is provided with a second through hole 401 connected to the cooling outlet fixed flow channel 202. The second static sealing component 4 is provided with a second ceramic ring 6 at the end of the second through hole 401. In this embodiment, the second ceramic ring 6 is embedded in a groove provided on the second static sealing component 4.

[0085] A rotating shaft, comprising a connecting rod 7 and a rotating ring 8, wherein the connecting rod 7 is rotatably mounted on the cooling jacket 2, and the rotating ring 8 is fixed on the connecting rod 7 by bolts;

[0086] The connecting rod 7 is provided with a central water outlet rotating flow channel 701 and a cooling inlet rotating flow channel 702, and the connecting rod 7 is provided with a third ceramic ring 9 arranged opposite to the first ceramic ring 5, and one end of the connecting rod 7 provided with the third ceramic ring 9 is a first dynamic sealing end;

[0087] The rotating ring 8 and the connecting rod 7 form a cooling outlet rotating flow channel 10, and the rotating ring 8 is provided with a fourth ceramic ring 11 arranged opposite to the second ceramic ring 6, and one end of the rotating ring 8 provided with the fourth ceramic ring 11 is a second dynamic sealing end;

[0088] The first elastic component can provide an axial force to drive the first ceramic ring 5 to press on the third ceramic ring 9, so that the first ceramic ring 5 and the third ceramic ring 9 are closely fitted, so that the central water outlet fixed flow channel 101 is connected with the central water outlet rotating flow channel 701 through the first through hole 301, and at the same time, the cooling inlet fixed flow channel 201 is connected with the cooling inlet rotating flow channel 702;

[0089] The second elastic component can provide an axial force to drive the second ceramic ring 6 to press on the fourth ceramic ring 11, so that the second ceramic ring 6 and the fourth ceramic ring 11 are closely fitted, so that the cooling outlet fixed flow channel 202 is connected with the cooling outlet rotating flow channel 10 through the second through hole 401;

[0090] In actual use, the connecting rod 7 can be inserted into the core shaft of the electric spindle, so that the flow channel for the central water outlet and the inlet flow channel and the outlet flow channel for cooling on the rotary joint are respectively connected with the corresponding flow channels opened on the core shaft, the rotating ring 8 is fixedly connected to the core shaft of the electric spindle by bolts, the connecting rod 7 and the core shaft of the electric spindle are sealed by an O-ring 20, and the cooling jacket 2 is fixedly connected to the outer shell of the electric spindle by bolts;

[0091] In this embodiment, if Figure 6As shown, in order to prevent fluid leakage, the contact part between the outside of the rotary joint and the electric spindle, as well as the contact surface of the parts inside the rotary joint that do not rotate relative to each other, are provided with grooves for installing the O-ring 20, so as to facilitate the installation of the O-ring 20;

[0092] In this embodiment, if Figure 6 As shown, for the convenience of processing, a part of the central water outlet fixed flow channel 101 is processed on the fixing seat 1, and the other part is processed on the cooling jacket 2. The holes left during processing can be plugged with a ball expansion plug 19.

[0093] In a specific embodiment, Figure 6 As shown, the first elastic component is a first spring 12, the first spring 12 is placed between the main body and the first static sealing component 3, and the first static sealing component 3 is evenly distributed with a plurality of blind holes for accommodating the first spring 12;

[0094] The second elastic component is a second spring 13 , which is disposed between the main body and the second static sealing component 4 . The second static sealing component 4 is evenly distributed with a plurality of blind holes for accommodating the second spring 13 .

[0095] In a specific embodiment, it also includes a first guide column 14 and a second guide column 15 fixed to the main body by bolts, the first guide column 14 and the second guide column 15 extend along the axial direction of the rotating shaft, the first static sealing component 3 is provided with a first guide hole corresponding to the first guide column 14, and the second static sealing component 4 is provided with a second guide hole corresponding to the second guide column 15, so as to perform a guiding function and ensure that the first spring 12 and the second spring 13 can accurately apply axial force.

[0096] Example 2

[0097] This embodiment provides a three-way rotary joint applicable to a high-speed electric spindle. The main structure of this embodiment is similar to that of Embodiment 1. The difference between this embodiment and Embodiment 1 is as follows:

[0098] In embodiment 1, the sealing structure 18 is a wear-resistant ring.

[0099] In the present embodiment, the sealing structure 18 is a sealing groove, and the flow cross-sectional area of ​​the sealing groove is larger than the flow cross-sectional area of ​​the rotating gap 16, so that the coolant entering the rotating gap 16 from the first distribution chamber C and the coolant entering the rotating gap 16 from the second distribution chamber D can be decompressed after entering the sealing groove, thereby reducing the flow rate of the coolant passing through the rotating gap 16.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A three-way rotary joint applicable to a high-speed electric spindle, characterized in that: include: The fixed part comprises a main body, a first static sealing component (3) and a second static sealing component (4), wherein the first static sealing component (3) and the second static sealing component (4) are mounted on the main body in a floating manner rather than a rotational manner, and the main body is provided with a central water outlet fixed flow channel (101), a cooling inlet fixed flow channel (201) and a cooling outlet fixed flow channel (202); A rotating shaft, rotatably mounted on the main body, wherein the rotating shaft is provided with a central water outlet rotating flow channel (701), a cooling inlet rotating flow channel (702) and a cooling outlet rotating flow channel (10); The first elastic component is capable of providing an axial force to drive the first static sealing component (3) to press against the first dynamic sealing end of the rotating shaft, so that the end of the first static sealing component (3) and the end of the first dynamic sealing end fit together to form a contact seal, so that the central water outlet fixed flow channel (101) and the central water outlet rotating flow channel (701) are connected, and at the same time, the cooling inlet fixed flow channel (201) and the cooling inlet rotating flow channel (702) are connected; The second elastic component can provide an axial force to drive the second static sealing component (4) to press against the second dynamic sealing end of the rotating shaft, so that the end of the second static sealing component (4) and the end of the second dynamic sealing end fit together to form a contact seal, so that the cooling outlet fixed flow channel (202) and the cooling outlet rotating flow channel (10) are connected.

2. The three-way rotary joint applicable to high-speed electric spindles according to claim 1 is characterized in that: A receiving cavity is provided in the main body, and the first dynamic sealing end is located in the receiving cavity; The first dynamic sealing end divides the accommodating cavity into a first distribution cavity and a second distribution cavity, the cooling inlet fixed flow channel (201) is connected to the cooling inlet rotating flow channel (702) through the first distribution cavity, and the cooling outlet fixed flow channel (202) is connected to the cooling outlet rotating flow channel (10) through the second distribution cavity.

3. The three-way rotary joint applicable to high-speed electric spindles according to claim 2 is characterized in that: A rotation gap (16) is left between the first dynamic seal end and the inner wall of the main body, the rotation gap (16) is located between the first distribution chamber and the second distribution chamber, the two ends of the rotation gap (16) are respectively connected to the first distribution chamber and the second distribution chamber, and a sealing structure (18) is provided in the rotation gap (16).

4. The three-way rotary joint applicable to high-speed electric spindles according to claim 3 is characterized in that: The sealing structure (18) is a wear-resistant ring; Alternatively, the sealing structure (18) is a sealing groove, and the flow cross-sectional area of ​​the sealing groove is larger than the flow cross-sectional area of ​​the rotating gap (16).

5. The three-way rotary joint applicable to high-speed electric spindles according to claim 3 is characterized in that: The cooling inlet rotating flow channel (702) is provided with a transition section (7021) inclined toward the cooling inlet fixed flow channel (201), and the first static sealing component (3) located in the first distribution chamber is provided with a step portion (21), and the cooling liquid flowing from the cooling inlet fixed flow channel (201) into the first distribution chamber changes direction through the step portion (21) and flows into the transition section (7021).

6. The three-way rotary joint applicable to high-speed electric spindles according to claim 3 is characterized in that: The second distribution chamber is provided with a guide bevel (17), the guide bevel (17) being located at an end of the rotating gap (16) close to one end of the second distribution chamber, the guide bevel being used to guide the fluid away from the rotating gap (16) and flowing toward the cooling outlet fixed flow channel (202).

7. The three-way rotary joint applicable to high-speed electric spindles according to claim 2 is characterized in that: A third ceramic ring (9) is provided at the end of the first dynamic sealing end, a first ceramic ring (5) is provided at the end of the first static sealing component (3) and is arranged opposite to the third ceramic ring (9), a fourth ceramic ring (11) is provided at the end of the second dynamic sealing end, and a second ceramic ring (6) is provided at the end of the second static sealing component (4) and is arranged opposite to the fourth ceramic ring (11).

8. The three-way rotary joint applicable to high-speed electric spindles according to claim 7 is characterized in that: The main body comprises a fixing seat (1) and a cooling jacket (2), wherein the cooling jacket (2) is fixed on the fixing seat (1), and the cooling jacket (2) and the fixing seat (1) form a receiving cavity; The fixing seat (1) is provided with a central water outlet fixed flow channel (101); the first static sealing component (3) is mounted on the fixing seat (1) in a floating manner but not in a rotational manner; the first static sealing component (3) is provided with a first through hole (301) connected to the central water outlet fixed flow channel (101); the first static sealing component (3) is provided with a first ceramic ring (5) at the end of the first through hole (301); The cooling jacket (2) is provided with a cooling inlet fixed flow channel (201) and a cooling outlet fixed flow channel (202); the second static sealing component (4) is mounted on the cooling jacket (2) in a floating manner but not in a rotational manner; the second static sealing component (4) is provided with a second through hole (401) connected to the cooling outlet fixed flow channel (202); the second static sealing component (4) is provided with a second ceramic ring (6) at the end of the second through hole (401); A rotating shaft, comprising a connecting rod (7) and a rotating ring (8), wherein the connecting rod (7) is rotatably mounted on the cooling jacket (2), and the rotating ring (8) is fixed on the connecting rod (7); The connecting rod (7) is provided with a central water outlet rotating flow channel (701) and a cooling inlet rotating flow channel (702), the connecting rod (7) is provided with a third ceramic ring (9) arranged opposite to the first ceramic ring (5), and one end of the connecting rod (7) provided with the third ceramic ring (9) is a first dynamic sealing end; The rotating ring (8) and the connecting rod (7) form a cooling outlet rotating flow channel (10); the rotating ring (8) is provided with a fourth ceramic ring (11) arranged opposite to the second ceramic ring (6); one end of the rotating ring (8) provided with the fourth ceramic ring (11) is a second dynamic sealing end; The first elastic component is capable of providing an axial force to drive the first ceramic ring (5) to press against the third ceramic ring (9), so that the first ceramic ring (5) and the third ceramic ring (9) are tightly fitted, so that the central water outlet fixed flow channel (101) is connected to the central water outlet rotating flow channel (701) through the first through hole (301), and at the same time, the cooling inlet fixed flow channel (201) is connected to the cooling inlet rotating flow channel (702); The second elastic component can provide an axial force to drive the second ceramic ring (6) to press against the fourth ceramic ring (11), so that the second ceramic ring (6) and the fourth ceramic ring (11) are tightly fitted, so that the cooling outlet fixed flow channel (202) is connected to the cooling outlet rotating flow channel (10) through the second through hole (401).

9. The three-way rotary joint applicable to high-speed electric spindles according to claim 1, characterized in that: The first elastic component is a first spring (12), and the first spring (12) is placed between the main body and the first static sealing component (3); The second elastic component is a second spring (13), and the second spring (13) is placed between the main body and the second static sealing component (4).

10. The three-way rotary joint applicable to high-speed electric spindles according to claim 9, characterized in that: The invention also comprises a first guide column (14) and a second guide column (15) arranged on the main body, wherein the first guide column (14) and the second guide column (15) extend along the axial direction of the rotating shaft, the first static sealing component (3) is provided with a first guide hole corresponding to the first guide column (14), and the second static sealing component (4) is provided with a second guide hole corresponding to the second guide column (15).

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