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

Abstract

The utility model discloses a three-way rotary joint capable of being applied to a high-speed motorized spindle, which comprises a fixed part comprising 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] This utility model relates to the field of rotary joint technology, and in particular to a three-way rotary joint that can be applied to high-speed electric spindles. Background Technology

[0002] A rotary joint is a connecting and sealing device used to input media from a static system to a dynamic rotating system. Currently, most widely used rotary joints are single-channel types. When applied to electric spindles, they primarily achieve the center water outlet function by connecting to the spindle's mandrel.

[0003] During the operation of an electric spindle, the motor and bearings, acting as heat sources, generate heat, leading to thermal expansion and affecting the machining accuracy of the electric spindle. Therefore, the structural design of the electric spindle needs to consider cooling the spindle mandrel to reduce the impact of thermal expansion. However, existing single-channel rotary joints, due to the limitation of the number of channels, cannot simultaneously meet the dual requirements of central water outlet and mandrel cooling for the electric spindle. Utility Model Content

[0004] This invention provides a three-way rotary joint applicable to high-speed electric spindles to simultaneously meet the needs of central water outlet and spindle cooling in electric spindles.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A three-way rotary joint applicable to high-speed electric spindles includes:

[0007] The fixing part includes 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 floatingly rather than rotatingly mounted on the main body, 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 the rotating shaft is provided with a central water outlet rotating channel, a cooling inlet rotating channel, and a cooling outlet rotating channel;

[0009] The first elastic component can provide 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, thereby connecting the central water outlet fixed flow channel and the central water outlet rotating flow channel, and at the same time connecting the cooling inlet fixed flow channel and the cooling inlet rotating flow channel.

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

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

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

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

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

[0015] Alternatively, the sealing structure may be a sealing groove, wherein the flow cross-sectional area of ​​the sealing groove is greater than the flow cross-sectional area of ​​the rotation gap.

[0016] Furthermore, the rotating flow channel of the cooling inlet is provided with a transition section that is inclined toward the fixed flow channel of the cooling inlet, and the first static sealing component located in the first distribution cavity is provided with a stepped portion. The coolant flowing from the fixed flow channel of the cooling inlet into the first distribution cavity flows into the transition section after being reversed by the stepped portion.

[0017] Furthermore, the second distribution cavity is provided with a guide slope, which is located at the end of the rotation gap near one end of the second distribution cavity. The guide slope is used to guide the fluid away from the rotation gap and flow towards the cooling outlet fixed flow channel.

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

[0019] Furthermore, the main body includes a fixed base and a cooling sleeve, the cooling sleeve being fixed on the fixed base, and the cooling sleeve and the fixed base forming a receiving cavity;

[0020] The fixed base is provided with a central water outlet fixed flow channel. The first static sealing component is floatingly rather than rotatingly mounted on the fixed base. The first static sealing component is provided with a first through hole that communicates with the central water outlet fixed flow channel. 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 fixed flow channel for cooling inlet and a fixed flow channel for cooling outlet. The second static sealing component is floatingly rather than rotatingly mounted on the cooling jacket. The second static sealing component is provided with a second through hole that communicates with the fixed flow channel for cooling outlet. The second static sealing component is provided with a second ceramic ring at the end of the second through hole.

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

[0023] The connecting rod is provided with a central water outlet rotating channel and a cooling inlet rotating channel. The connecting rod is provided with a third ceramic ring that is opposite to the first ceramic ring. The end of the connecting rod with the third ceramic ring is the 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 that is arranged opposite to the second ceramic ring. The end of the rotating ring with the fourth ceramic ring is the 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 are tightly fitted, so that the central water outlet fixed flow channel is connected to the central water outlet rotating flow channel through the first through hole, and at the same time, the cooling inlet fixed flow channel and the cooling inlet rotating flow channel are connected.

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

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

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

[0029] Furthermore, it also includes a first guide post and a second guide post disposed on the main body, the first guide post and the second guide post extending axially along the rotation axis, the first static sealing component having a first guide hole corresponding to the first guide post, and the second static sealing component having a second guide hole corresponding to the second guide post.

[0030] Beneficial effects:

[0031] The three-way rotary joint disclosed in this utility model, applicable to high-speed electric spindles, provides axial force by setting a first elastic component and a second elastic component. The first static sealing component and the second static sealing component on the drive 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. This allows the fixed flow channel and the rotating flow channel of the center water outlet, the fixed flow channel and the rotating flow channel of the cooling inlet, and the fixed flow channel and the rotating flow channel of the cooling outlet to be connected, thereby forming a flow channel for the center water outlet and an inlet flow channel and an outlet flow channel for the spindle cooling, so as to simultaneously meet the dual needs of the electric spindle for center water outlet and spindle cooling. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of the three-way rotary joint that can be applied to high-speed electric spindles disclosed in this utility model;

[0034] Figure 2 This is a left view of the three-way rotary joint disclosed in this utility model, which can be applied to a high-speed electric spindle.

[0035] Figure 3 This is a right view of the three-way rotary joint disclosed in this utility model, which can be applied to a high-speed electric spindle.

[0036] Figure 4 This is a schematic diagram of the fixing part of the three-way rotary joint that can be applied to a high-speed electric spindle, as disclosed in this utility model.

[0037] Figure 5 This is a schematic diagram of the rotating shaft structure of the three-way rotary joint that can be applied to high-speed electric spindles disclosed in this utility model;

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

[0039] Figure 7 This is a fluid flow diagram of the three-way rotary joint that can be applied to a high-speed electric spindle, as disclosed in this utility model.

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

[0041] In the picture:

[0042] 1. Fixed base; 101. Central water outlet fixed flow channel;

[0043] 2. Cooling jacket; 201. Fixed flow channel for cooling inlet; 202. Fixed flow channel for cooling outlet;

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

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

[0046] 5. First ceramic ring;

[0047] 6. Second ceramic ring;

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

[0049] 8. Rotating ring;

[0050] 9. Third ceramic ring;

[0051] 10. Cooling outlet rotary flow channel;

[0052] 11. Fourth ceramic ring;

[0053] 12. The first spring;

[0054] 13. The second spring;

[0055] 14. First guide post;

[0056] 15. Second guide post;

[0057] 16. Rotation clearance;

[0058] 17. Guide ramp;

[0059] 18. Sealed structure;

[0060] 19. Ball expansion plug;

[0061] 20. O-rings;

[0062] 21. Stepped section;

[0063] C. First distribution cavity; D. Second distribution cavity. Detailed Implementation

[0064] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0065] Example 1

[0066] This embodiment provides a three-way rotary joint applicable to high-speed electric spindles, such as... Figure 6 and Figure 7 As shown, it includes:

[0067] The fixing part includes a main body, a first static sealing component 3 and a second static sealing component 4. The first static sealing component 3 and the second static sealing component 4 are floatingly rather than rotatingly mounted on the main body. 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 is rotatably mounted on the main body, and 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 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 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 ends of the second static sealing component 4 and the second dynamic sealing end fit together to form a contact seal, thereby connecting the cooling outlet fixed flow channel 202 and the cooling outlet rotating flow channel 10.

[0071] The three-way rotary joint provided in this embodiment, applicable to high-speed electric spindles, provides axial force by setting a first elastic component and a second elastic component. This force drives the first static sealing component 3 and the second static sealing component 4 on the main body to press against the first dynamic sealing end and the second dynamic sealing end of the rotating shaft, respectively. This creates a contact seal between the fixed part and the rotating shaft, thereby connecting the central water outlet fixed flow channel 101 and the central water outlet rotary flow channel 701, the cooling inlet fixed flow channel 201 and the cooling inlet rotary flow channel 702, and the cooling outlet fixed flow channel 202 and the cooling outlet rotary flow channel 10. This forms a flow channel for central water outlet and an inlet and outlet flow channel for spindle cooling, thus simultaneously meeting the dual requirements of central water outlet and spindle cooling for the electric spindle.

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

[0073] The first dynamic sealing end divides the receiving 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 the several fixed cooling inlet channels 201 can be evenly distributed into the several rotating cooling inlet channels 702, and the coolant flowing in from the several rotating cooling outlet channels 10 can be evenly distributed into the several fixed cooling outlet channels 202.

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

[0076] By setting the rotation gap 16, the first dynamic sealing end of the rotating shaft can be rotated relative to the main body. By setting the sealing structure 18, the relative flow of coolant in the first distribution chamber C and the second distribution chamber D is reduced.

[0077] In a specific embodiment, the sealing structure 18 is a wear-resistant ring. In this embodiment, the cooling sleeve 2 of the main body is provided with a groove for installing the wear-resistant ring, so that the fixing seat 1 of the main body and the cooling sleeve 2 form a contact seal through the wear-resistant ring.

[0078] In a specific embodiment, such as Figure 8As shown, the cooling inlet rotating flow channel 702 is provided with a transition section 7021 that is inclined toward the cooling inlet fixed flow channel 201. The first static sealing component 3 located in the first distribution cavity C is provided with a stepped portion 21. The coolant flowing from the cooling inlet fixed flow channel 201 into the first distribution cavity C flows into the transition section 7021 after being reversed by the stepped portion 21, ensuring smoother coolant flow. At the same time, it avoids direct impact on the contact area between the first static sealing component 3 and the first dynamic sealing end when the coolant flows from the cooling inlet rotating flow channel 702 into the first distribution cavity C, so as not to affect the sealing effect.

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

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

[0081] Under the axial force provided by the elastic component, the tightly fitted ceramic rings exhibit 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, such as Figures 1 to 6 As shown, the main body includes a fixed base 1 and a cooling sleeve 2. The cooling sleeve 2 is fixed to the fixed base 1 by bolts, and the cooling sleeve 2 and the fixed base 1 form a receiving cavity.

[0083] The fixed base 1 is provided with a central water outlet fixed flow channel 101. The first static sealing component 3 is floatingly rather than rotatingly mounted on the fixed base 1. The first static sealing component 3 is provided with a first through hole 301 that communicates with 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. In this embodiment, the first ceramic ring 5 is embedded in a groove opened 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 floatingly rather than rotatingly mounted on the cooling jacket 2. The second static sealing component 4 is provided with a second through hole 401 that communicates with 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 opened on the second static sealing component 4.

[0085] The rotating shaft includes a connecting rod 7 and a rotating ring 8. The connecting rod 7 is rotatably mounted on the cooling jacket 2, and the rotating ring 8 is fixed to the connecting rod 7 by bolts.

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

[0087] 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 that is opposite to the second ceramic ring 6. The end of the rotating ring 8 with the fourth ceramic ring 11 is the 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 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 and the cooling inlet rotating flow channel 702 are connected.

[0089] The second elastic component can provide 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, and the cooling outlet fixed flow channel 202 is connected to the cooling outlet rotating flow channel 10 through the second through hole 401.

[0090] In practical use, the connecting rod 7 can be inserted into the spindle of the electric spindle, so that the flow channel on the rotary joint for the center water outlet and the inlet and outlet flow channels for cooling are respectively connected to the corresponding flow channels opened on the spindle. The rotating ring 8 is fixedly connected to the spindle of the electric spindle by bolts, the connecting rod 7 is sealed to the spindle of the electric spindle by O-ring 20, and the cooling sleeve 2 is fixedly connected to the outer shell of the electric spindle by bolts.

[0091] In this embodiment, as Figure 6As shown, to prevent fluid leakage, the contact surfaces of the rotary joint's external contact points with the electric spindle, as well as the contact surfaces of the internal components of the rotary joint that do not rotate relative to each other, are provided with grooves for installing O-rings 20, so as to facilitate the installation of O-rings 20.

[0092] In this embodiment, as Figure 6 As shown, for ease of machining, a portion of the central water outlet fixed flow channel 101 is machined onto the fixed base 1, while the other portion is machined onto the cooling jacket 2. Holes left during machining can be sealed using a ball-expanding plug 19.

[0093] In a specific embodiment, such as Figure 6 As shown, the first elastic component is a first spring 12, which is placed between the main body and the first static sealing component 3. The first static sealing component 3 has a plurality of blind holes evenly distributed on it for accommodating the first spring 12.

[0094] The second elastic component is a second spring 13, which is placed between the main body and the second static sealing component 4. The second static sealing component 4 has a plurality of blind holes evenly distributed on it to accommodate the second spring 13.

[0095] In a specific embodiment, it also includes a first guide post 14 and a second guide post 15 fixed to the main body by bolts. The first guide post 14 and the second guide post 15 extend axially along the rotation axis. The first static sealing component 3 is provided with a first guide hole corresponding to the first guide post 14, and the second static sealing component 4 is provided with a second guide hole corresponding to the second guide post 15, so as to perform the 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 high-speed electric spindles. 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 Example 1, the sealing structure 18 is a wear-resistant ring.

[0099] In this 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 rotation gap 16, so that the coolant entering the rotation gap 16 from the first distribution chamber C and the coolant entering the rotation gap 16 from the second distribution chamber D can be depressurized after entering the sealing groove, thereby reducing the flow rate of coolant through the rotation gap 16.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A three-way rotary joint applicable to high-speed electric spindles, characterized in that, include: The fixing part includes a main body, a first static sealing component (3) and a second static sealing component (4), the first static sealing component (3) and the second static sealing component (4) are floatingly rather than rotatingly mounted on the main body, 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 is rotatably mounted on the main body, and 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); The first elastic component can provide 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 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, thereby connecting the cooling outlet fixed flow channel (202) and the cooling outlet rotating flow channel (10).

2. The three-way rotary joint applicable to high-speed electric spindles according to claim 1, characterized in that, The main body has a receiving cavity, and the first dynamic sealing end is located inside the receiving cavity; The first dynamic sealing end divides the receiving 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, characterized in that, A rotation gap (16) is provided between the first dynamic sealing end and the inner wall of the main body. The rotation gap (16) is located between the first distribution cavity and the second distribution cavity. The two ends of the rotation gap (16) are respectively connected to the first distribution cavity and the second distribution cavity. 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, 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 greater than the flow cross-sectional area of ​​the rotation gap (16).

5. The three-way rotary joint applicable to high-speed electric spindles according to claim 3, 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). The first static sealing component (3) located in the first distribution cavity is provided with a step (21). The coolant flowing from the cooling inlet fixed flow channel (201) into the first distribution cavity flows into the transition section (7021) after being reversed by the step (21).

6. The three-way rotary joint applicable to high-speed electric spindles according to claim 3, characterized in that, The second distribution cavity is provided with a guide slope (17), which is located at the end of the rotation gap (16) near one end of the second distribution cavity. The guide slope is used to guide the fluid away from the rotation gap (16) and flow towards the cooling outlet fixed flow channel (202).

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

8. The three-way rotary joint applicable to high-speed electric spindles according to claim 7, characterized in that, The main body includes a fixed base (1) and a cooling sleeve (2), the cooling sleeve (2) is fixed on the fixed base (1), and the cooling sleeve (2) and the fixed base (1) form a receiving cavity; The fixed base (1) is provided with a central water outlet fixed flow channel (101). The first static sealing component (3) is floating rather than rotating on the fixed base (1). The first static sealing component (3) is provided with a first through hole (301) that communicates with 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 sleeve (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 floating rather than rotating on the cooling sleeve (2). The second static sealing component (4) is provided with a second through hole (401) that communicates with 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). The rotating shaft includes a connecting rod (7) and a rotating ring (8), wherein the connecting rod (7) is rotatably mounted on the cooling sleeve (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 channel (701) and a cooling inlet rotating channel (702). The connecting rod (7) is provided with a third ceramic ring (9) that is opposite to the first ceramic ring (5). The end of the connecting rod (7) with the third ceramic ring (9) is the 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) that is opposite to the second ceramic ring (6). One end of the rotating ring (8) with the fourth ceramic ring (11) is the second dynamic sealing end. The first elastic component can provide 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) fit tightly together, 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) and the cooling inlet rotating flow channel (702) are connected. 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) fit tightly together, and 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), which is placed between the main body and the first static sealing component (3); The second elastic component is a second spring (13), which 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, It also includes a first guide post (14) and a second guide post (15) disposed on the main body. The first guide post (14) and the second guide post (15) extend axially along the rotation axis. The first static sealing component (3) is provided with a first guide hole corresponding to the first guide post (14), and the second static sealing component (4) is provided with a second guide hole corresponding to the second guide post (15).

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