Large-flow water rotating joint structure

Abstract

The invention provides a high-flow water rotating joint structure, and mainly relates to the technical field of liquid metal printing. A large-flow water rotating joint structure comprises an inner connecting cylinder and an outer connecting cylinder arranged outside the inner connecting cylinder in a sleeving mode, the lower end of the outer connecting cylinder is rotationally connected with a pressing plate through a pivotal bearing, a center water inlet pipe is integrally and fixedly installed at the lower end of the inner connecting cylinder, and the lower end of a center water outlet pipe is connected with the center water inlet pipe in an inserted mode. A side water inlet pipe communicated with the inner connecting cylinder is integrally and fixedly installed on the lower portion of one side of the inner connecting cylinder, a side water outlet pipe communicated with the outer connecting cylinder is integrally and fixedly installed on the upper portion of one side of the outer connecting cylinder, and a sealing plate is fixedly installed on the upper portion of the periphery of the center water outlet pipe. The device has the beneficial effects that a nested mounting structure of the inner connecting cylinder and the outer connecting cylinder is adopted, and the side water outlet pipe and the side water inlet pipe are designed into an integrated structure, so that the layout of an internal water passing channel is optimized, the overall structure is simplified, and the space utilization rate is increased.

Description

TECHNICAL FIELD

[0001] The present application mainly relates to the technical field of liquid metal printing, and particularly relates to a large-flow water rotary joint structure. BACKGROUND

[0002] In the liquid metal ring printing industry, the water-cooled equipment is a key component for ensuring the stable printing process and preventing overheating damage of the equipment, and the water rotary joint, as a core component for realizing water connection between the fixed pipeline and the rotating part in the water-cooled equipment, directly affects the operation efficiency and overall structure layout of the water-cooled equipment.

[0003] At present, the existing water rotary joints on the market have obvious technical defects. On the one hand, in order to realize large-flow water, the size of the internal water passage and the volume of the external structure of the existing water rotary joint need to be increased, resulting in that the number of large-flow water rotary joints is extremely small, and the existing large-flow water rotary joints are bulky, occupy a large space, and have extremely low space utilization. The water-cooled equipment for liquid metal ring printing has strict limitations on the installation space of each component in order to ensure the printing precision and the integration degree of the equipment, and the existing large-flow water rotary joint is difficult to be integrated into the water-cooled equipment with compact structure, which greatly limits the design diversity of the water-cooled equipment, and is not conducive to the miniaturization and integration development of the equipment. On the other hand, the existing water rotary joint has a large number of components, the assembly process is complex, and the interface is mainly connected in the traditional threaded connection mode, so the installation and replacement process is complicated, a large amount of time and labor cost is consumed, when the equipment needs to be repaired and replaced due to failure, the normal operation of the water-cooled equipment will be seriously affected, and the printing efficiency of the liquid metal ring is reduced. SUMMARY

[0004] In order to solve the problems of the prior art, the present application provides a large-flow water rotary joint structure, which is realized by the following technical scheme: The utility model provides a kind of high-flow water swivel joint structure, including inner connecting cylinder and the outer connecting cylinder of being set to its exterior, the lower part of the outer periphery of the inner connecting cylinder is fixedly installed with pressing plate, the lower end of the outer connecting cylinder is rotatably connected with pressing plate by rotary bearing, the upper part and the lower part of the outer periphery of the inner connecting cylinder are fixedly installed with first sealing ring, the first sealing ring is located in outer connecting cylinder and is abutted with its inner wall, the lower end of the inner connecting cylinder is integrally fixedly installed center water inlet pipe, the upper end of the center water inlet pipe extends to inner connecting cylinder, the upper end of the inner connecting cylinder is rotatably installed with the center water outlet pipe coaxially arranged with center water inlet pipe by plane bearing, the lower end of the center water outlet pipe extends to inner connecting cylinder, and the lower end of the center water outlet pipe is insertedly connected with center water inlet pipe, the connecting place of the center water outlet pipe and center water inlet pipe is equipped with several second sealing rings that are evenly distributed, the lower part of the side of the inner connecting cylinder is integrally fixedly installed with side water inlet pipe that is communicated with it, the upper part of the side of the outer connecting cylinder is integrally fixedly installed with side water outlet pipe that is communicated with it, and the upper part of the outer periphery of the inner connecting cylinder is provided with several through grooves that are communicated with outer connecting cylinder, the upper part of the outer periphery of the center water outlet pipe is fixedly installed with sealing plate, the lower end of the sealing plate is abutted with the upper end of outer connecting cylinder, and the third sealing ring is arranged between the sealing plate and outer connecting cylinder.

[0005] Further, the first sealing ring, the second sealing ring and the third sealing ring are all made of fluorine rubber material, and the cross sections are all "O" type, the matching surfaces of the first sealing ring and the outer periphery of the inner connecting cylinder, the inner wall of the outer connecting cylinder, the matching surfaces of the second sealing ring and the lower end of the center water outlet pipe, the inner wall of the center water inlet pipe, and the matching surfaces of the third sealing ring and the lower end of the sealing plate, the upper end of the outer connecting cylinder are all subjected to polishing treatment, and the surface roughness is not greater than Ra0.8 μm.

[0006] Further, the inner rings of the rotary bearing and the plane bearing are respectively interference-fitted with the pressing plate and the upper end of the inner connecting cylinder, the interference amount is controlled to be between 0.005-0.015 mm; the outer rings are respectively clearance-fitted with the lower end of the outer connecting cylinder and the inner wall of the center water outlet pipe, the fitting clearance is controlled to be between 0.01-0.03 mm, and the rotary bearing 8 is filled with high-temperature lubricating grease.

[0007] Further, the coaxiality error of the center water inlet pipe and the center water outlet pipe is not greater than 0.02 mm; the connecting places of the side water inlet pipe and the inner connecting cylinder, and the side water outlet pipe and the outer connecting cylinder are all arc transitioned.

[0008] Further, the number of the through grooves is 4-6, which are evenly distributed along the circumferential direction of the inner connecting cylinder, and the edges of the through grooves are all subjected to round corner treatment.

[0009] Further, the inner connecting barrel, the outer connecting barrel, the center water inlet pipe, the center water outlet pipe, the side water inlet pipe, the side water outlet pipe, the pressing plate and the sealing plate are made of 304 stainless steel material, and the surfaces are subjected to chrome plating treatment, the thickness of the chrome plating layer is 0.01-0.02mm, and the surface hardness of the chrome plating layer is not less than HV800.

[0010] Further, the number of the second sealing rings is 2-3, and the second sealing rings are uniformly distributed along the axis direction of the center water inlet pipe.

[0011] Further, the ports of the side water inlet pipe and the side water outlet pipe adopt quick connection structures, the quick connection structure comprises a connector body, a clamping sleeve and an elastic sealing ring, the clamping sleeve can slide along the axis of the connector body, the elastic sealing ring is compressed by the clamping sleeve to realize the sealing connection with the external pipeline, the elastic sealing ring is made of nitrile rubber material, and the outer periphery of the connector body is provided with anti-skid lines.

[0012] Compared with the prior art, the beneficial effects of the present application are: 1. The device adopts the "nested type" installation structure of the inner connecting barrel and the outer connecting barrel, and the side water outlet pipe and the side water inlet pipe are designed as an integrated structure, which simplifies the overall structure, reduces the number of components, optimizes the layout of the internal water passage, greatly reduces the overall volume of the rotary joint under the premise of ensuring large flow water, improves the space utilization rate, can be easily integrated into the liquid metal annular piece printing water cooling equipment with compact structure, provides more possibilities for the design of the water cooling equipment, is beneficial to the miniaturization and integration development of the equipment, adapts to the core requirement of high-efficiency heat dissipation in the liquid metal annular piece printing process, guarantees the stable operation of the printing equipment, and solves the problem that the traditional rotary joint is too large in size and cannot adapt to the compact space of the liquid metal annular piece printing water cooling equipment.

[0013] 2. The double-bearing stable support structure of the rotary bearing and the plane bearing is matched, which can effectively disperse the rotary stress of the center water outlet pipe, avoid the premature damage caused by the excessive stress of a single bearing, further prolong the service life of the rotary joint, reduce the maintenance cost, and cooperate with the multiple sealing structure to eliminate the risk of water leakage and avoid damaging the equipment or affecting the water cooling efficiency, thereby further prolonging the service life of the rotary joint. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a structural schematic view of the present application; Figure 2 is a side view of the present application; Figure 3 is a sectional view structure schematic view along Figure 2 the A-A line in the figure.

[0015] The following are the labels in the attached diagram: 1. Side water outlet pipe; 2. Side water inlet pipe; 3. Center water inlet pipe; 4. Center water outlet pipe; 5. Pressure plate; 6. Surface bearing; 7. Sealing ring; 8. Rotary bearing; 9. Inner connecting cylinder; 10. Outer connecting cylinder; 11. Through groove; 12. Sealing plate. Detailed Implementation

[0016] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined in this application.

[0017] Example: A high-flow-rate water rotary joint structure like Figures 1-3 As shown, a high-flow-rate water rotary joint structure includes the following specific components: The inner connecting cylinder 9 and the outer connecting cylinder 10 sleeved around it are provided. A pressure plate 5 is fixedly installed on the lower part of the outer periphery of the inner connecting cylinder 9. The lower end of the outer connecting cylinder 10 is rotatably connected to the pressure plate 5 through a rotary bearing 8. A first sealing ring is fixedly installed on both the upper and lower parts of the outer periphery of the inner connecting cylinder 9. The first sealing ring is located inside the outer connecting cylinder 10 and abuts against its inner wall. A central water inlet pipe 3 is integrally fixedly installed on the lower end of the inner connecting cylinder 9. The upper end of the central water inlet pipe 3 extends into the inner connecting cylinder 9. A central water outlet pipe 4, coaxially arranged with the central water inlet pipe 3, is rotatably installed on the upper end of the inner connecting cylinder 9 through a plane bearing 6. The lower end of the central water outlet pipe 4 extends into the inner connecting cylinder 9. The lower end of the central water outlet pipe 4 is connected to the central water inlet pipe 3. Several evenly distributed second sealing rings 7 are provided at the connection between the central water outlet pipe 4 and the central water inlet pipe 3. The side water inlet pipe 2 connected to it is integrally fixedly installed on the lower part of one side of the inner connecting cylinder 9. The side water outlet pipe 1 connected to it is integrally fixedly installed on the upper part of one side of the outer connecting cylinder 10. Several through grooves 11 communicating with the outer connecting cylinder 10 are opened on the upper part of the outer periphery of the inner connecting cylinder 10. A sealing plate 12 is fixedly installed on the upper part of the outer periphery of the central water outlet pipe 4. The lower end of the sealing plate 12 abuts against the upper end of the outer connecting cylinder 10. A third sealing ring is provided between the sealing plate 12 and the outer connecting cylinder 10.

[0018] The working principle described above is as follows: The large-flow water rotary joint takes a "inner connecting cylinder 9 + outer connecting cylinder 10" nested mode as a core framework to realize water connection and relative rotation of fixed and rotating parts. The inner connecting cylinder 9 is fixed, and the lower part of the outer periphery of the inner connecting cylinder 9 is fixed with a pressing plate 5 connected with the lower end of the outer connecting cylinder 10 through a rotary bearing 8. The upper end of the inner connecting cylinder 9 is connected with a central water outlet pipe 4 through a plane bearing 6. The double bearing cooperation provides stable rotary support for the outer connecting cylinder 10 and the central water outlet pipe 4, and ensures smooth rotation of the two relative to the inner connecting cylinder 9. When water flows, cooling water can enter through two paths: one path flows into the central water inlet pipe 3 and is delivered to the rotating part through the central water outlet pipe 4; the other path flows into the inner connecting cylinder 9 through the side water inlet pipe 2, and then enters the outer connecting cylinder 10 through the through slot 11 on the upper part of the outer periphery of the inner connecting cylinder 9. The cooling water that has completed heat exchange is finally discharged from the side water outlet pipe 1 on the upper part of one side of the outer connecting cylinder 10, forming a complete water flow circuit.

[0019] In terms of sealing, the first sealing ring on the upper and lower parts of the outer periphery of the inner connecting cylinder 9 abuts against the inner wall of the outer connecting cylinder 10 to block the gap between the inner and outer cylinders. The second sealing ring 7 at the connection between the central water outlet pipe 4 and the central water inlet pipe 3 prevents axial water leakage. The third sealing ring between the sealing plate 12 and the upper end of the outer connecting cylinder 10 blocks the gap at the top to achieve full-link sealing.

[0020] The first sealing ring, the second sealing ring 7 and the third sealing ring are all made of fluororubber material, and the cross section is "O" type. This material has excellent water corrosion resistance and aging resistance, and can withstand long-term immersion and rotation friction of cooling water, avoiding the failure of the sealing ring due to material aging or corrosion. The "O" type cross section design enables the sealing ring to fully adhere to the mating surface in the extruded state, forming a reliable sealing surface.

[0021] At the same time, the mating surface of the first sealing ring and the outer periphery of the inner connecting cylinder 9 and the inner wall of the outer connecting cylinder 10, the mating surface of the second sealing ring 7 and the lower end of the central water outlet pipe 4 and the inner wall of the central water inlet pipe 3, and the mating surface of the third sealing ring and the lower end of the sealing plate 12 and the upper end of the outer connecting cylinder 10 are all polished (surface roughness ≤Ra0.8μm), reducing the friction resistance between the sealing ring and the mating surface, reducing the wear rate of the sealing ring during rotation, eliminating the small gap between the mating surfaces, further improving the sealing reliability, and avoiding the leakage of cooling water from the gap. The low surface roughness mating surface can reduce the friction loss of the sealing ring, indirectly prolong the service life of the rotary joint as a whole, reduce the rotation resistance, and improve the smoothness of rotation.

[0022] The inner ring of the slewing bearing 8 is in interference fit (interference amount is 0.005-0.015mm) with the pressing plate 5, and the inner ring of the plane bearing 6 is in interference fit with the upper end of the inner connecting cylinder 9, which can ensure that the inner ring of the slewing bearing 8 does not slide relative to the pressing plate 5 and the inner connecting cylinder 9, and avoid rotation deviation caused by loose inner ring; the outer ring of the slewing bearing 8 is in clearance fit with the lower end of the outer connecting cylinder 10, and the outer ring of the plane bearing 6 is in clearance fit with the inner wall of the central water outlet pipe 4 (fitting clearance is 0.01-0.03mm), which provides sufficient space for the rotation of the outer ring, the outer connecting cylinder 10 and the central water outlet pipe 4, and at the same time avoids excessive radial runout caused by excessive clearance.

[0023] The high-temperature lubricating grease filled in the slewing bearing 8 can form a lubricating film between the rolling elements and the inner and outer rings of the bearing, reducing direct friction between metals and reducing wear rate; at the same time, the high-temperature lubricating grease can withstand temperature changes during equipment operation (-20℃-120℃), avoid lubrication failure caused by excessive temperature, ensure stable operation of the bearing under different working conditions, prolong the service life of the bearing, reduce rotation noise, and improve the equipment operation environment.

[0024] The coaxiality error of the central water inlet pipe 3 and the central water outlet pipe 4 is ≤0.02mm, which can ensure that there is no deviation and misalignment in the internal water passage after the two are inserted, avoid water flow impact on the channel wall and vortex caused by poor coaxiality, ensure smooth central water passage, and reduce water flow resistance; the connection between the side water inlet pipe 2 and the inner connecting cylinder 9 and the connection between the side water outlet pipe 1 and the outer connecting cylinder 10 use circular arc transition, which can eliminate sharp corners at the connection site, make the cooling water flow smoothly when passing through the connection, avoid excessive local resistance caused by excessive local resistance, and ensure the flow efficiency of the side water passage.

[0025] The number of the through grooves 11 is 4-6, which are evenly distributed along the circumferential direction of the inner connecting cylinder 9, and the edges of the through grooves 11 are all rounded. The number of the through grooves 11 is 4-6 and they are evenly distributed along the circumference of the inner connecting cylinder 9, which can ensure that the cooling water in the inner connecting cylinder 9 can flow into the outer connecting cylinder 10 evenly and quickly through the through grooves 11, avoid local water congestion caused by uneven distribution of the through grooves 11, and ensure the water efficiency between the inner and outer cylinders; the edges of the through grooves 11 are rounded, which can eliminate sharp edges, avoid vortex or water loss when the cooling water flows through the through grooves 11, prevent the sharp edges from scratching the sealing ring or other parts, prolong the service life of the device, and improve the operation stability.

[0026] The inner connecting cylinder 9, the outer connecting cylinder 10, the center water inlet pipe 3, the center water outlet pipe 4, the side water inlet pipe 2, the side water outlet pipe 1, the pressing plate 5 and the sealing plate 12 are made of 304 stainless steel material, which has excellent moisture corrosion resistance and mechanical strength, can withstand long-term immersion in cooling water and external force during equipment operation, and avoids deformation and damage of parts due to corrosion or insufficient strength; the surface of the parts is chrome plated (chrome plating layer thickness 0.01-0.02mm, surface hardness ≥HV800), the chrome plating layer has high wear resistance and high surface finish, which can reduce the friction loss between parts during rotation, reduce the corrosion rate of the cooling water on the surface of the parts, avoid surface rust affecting the sealing or rotation performance, so that the rotary joint of the technical scheme can adapt to the long-term humid working environment of the water cooling equipment for liquid metal ring printing, reduce the maintenance and replacement frequency, and reduce the cost.

[0027] The second sealing ring 7 is 2-3 in number and uniformly distributed along the axis of the center water inlet pipe 3, forming a multiple sealing barrier at the insertion part of the center water outlet pipe 4 and the center water inlet pipe 3. When the cooling water tries to leak from the insertion gap, it needs to break through the sealing resistance of multiple second sealing rings 7 in turn, so that even if one of the sealing rings has a small gap due to wear, the remaining sealing rings can still maintain the sealing effect and prevent water leakage; at the same time, the uniform distribution of the spacing can ensure that each sealing ring is uniformly stressed, avoiding the premature aging and failure of local sealing rings due to excessive stress, reducing maintenance and replacement due to local failure of the sealing ring, and reducing maintenance costs.

[0028] The ports of the side water inlet pipe 2 and the side water outlet pipe 1 adopt a quick connection structure, which includes a connector body, a sleeve and an elastic sealing ring. The sleeve can slide along the axis of the connector body, and the elastic sealing ring is compressed by the sleeve to achieve sealed connection with the external pipeline. The elastic sealing ring is made of nitrile rubber, and the outer periphery of the connector body is provided with anti-slip patterns. The side water inlet pipe 2 and the side water outlet pipe 1 with the quick connection structure can quickly connect or disassemble with the external pipeline, greatly improving the installation efficiency compared with traditional threaded connection, reducing labor costs, and quickly replacing parts during maintenance, shortening the equipment downtime. When the large-flow water rotary joint structure is used in the water cooling equipment for liquid metal ring printing, the quick connection structure of the side water inlet pipe 2 and the center water inlet pipe 3 is quickly connected with the external water supply pipeline, the cooling water enters the rotating parts of the water cooling equipment through the cylindrical water passage of the fixed side and the central water passage of the center water outlet pipe body 4, and is discharged from the side water outlet pipe body 1 after heat exchange. During rotation, the plane bearing 6 and the rotary bearing 8 ensure the stability of rotation, and the sealing ring 7 ensures good sealing, effectively avoiding water leakage. At the same time, the compact structure design makes it can adapt to the narrow installation space of the water cooling equipment, improves the integration degree and operation efficiency of the equipment.

[0029] It should be explained that the terms of nouns indicating the orientation in the description of the present application are merely for the convenience of description and understanding, and do not limit the installation position of the specific technical features, and other installation modes that can be achieved are not excluded.

[0030] The serial numbers of the components in the present application, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. The "connection" and "coupling" in the present application include direct and indirect connection (coupling) unless otherwise specified. In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0032] Finally, it should be pointed out that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A large flow water swivel structure comprising an inner connection cylinder (9) and an outer connection cylinder (10) sleeved outside the inner connection cylinder (9), characterized in that, The lower part of the outer periphery of the inner connecting cylinder (9) is fixedly installed with a pressing plate (5), the lower end of the outer connecting cylinder (10) is rotatably connected with the pressing plate (5) through a rotary bearing (8), the upper part and the lower part of the outer periphery of the inner connecting cylinder (9) are fixedly installed with first sealing rings, the first sealing rings are located in the outer connecting cylinder (10) and abut against the inner wall thereof, the lower end of the inner connecting cylinder (9) is integrally fixedly installed with a central water inlet pipe (3), the upper end of the central water inlet pipe (3) extends into the inner connecting cylinder (9), the upper end of the inner connecting cylinder (9) is rotatably installed with a central water outlet pipe (4) coaxially arranged with the central water inlet pipe (3) through a plane bearing (6), the lower end of the central water outlet pipe (4) extends into the inner connecting cylinder (9), and the lower end of the central water outlet pipe (4) is insertedly connected with the central water inlet pipe (3), a plurality of second sealing rings (7) are arranged at the connection between the central water outlet pipe (4) and the central water inlet pipe (3), the lower part of one side of the inner connecting cylinder (9) is integrally fixedly installed with a side water inlet pipe (2) communicated therewith, the upper part of one side of the outer connecting cylinder (10) is integrally fixedly installed with a side water outlet pipe (1) communicated therewith, and a plurality of through grooves (11) communicated with the outer connecting cylinder (10) are formed in the upper part of the outer periphery of the inner connecting cylinder (10), the upper part of the outer periphery of the central water outlet pipe (4) is fixedly installed with a sealing plate (12), the lower end of the sealing plate (12) abuts against the upper end of the outer connecting cylinder (10), and a third sealing ring is arranged between the sealing plate (12) and the outer connecting cylinder (10).

2. A large flow water swivel according to claim 1, characterized in that The first sealing ring, the second sealing ring (7) and the third sealing ring are all made of fluorine rubber and have a "O" shaped cross section, the matching surfaces of the first sealing ring with the outer periphery of the inner connecting cylinder (9) and the inner wall of the outer connecting cylinder (10), the matching surfaces of the second sealing ring (7) with the lower end of the central water outlet pipe (4) and the inner wall of the central water inlet pipe (3), and the matching surfaces of the third sealing ring with the lower end of the sealing plate (12) and the upper end of the outer connecting cylinder (10) are all subjected to polishing treatment, and the surface roughness is not greater than Ra0.8μm.

3. A large flow water swivel according to claim 1, characterized in that The inner rings of the rotary bearing (8) and the plane bearing (6) are in interference fit with the pressing plate (5) and the upper end of the inner connecting cylinder (9) respectively, the interference amount is controlled to be between 0.005-0.015mm, the outer rings are in clearance fit with the lower end of the outer connecting cylinder (10) and the inner wall of the central water outlet pipe (4) respectively, the fit clearance is controlled to be between 0.01-0.03mm, and the rotary bearing (8) is filled with high-temperature lubricating grease.

4. A large flow water swivel according to claim 1, characterized in that The coaxiality error of the central water inlet pipe (3) and the central water outlet pipe (4) is not greater than 0.02mm, and the connecting parts of the side water inlet pipe (2) with the inner connecting cylinder (9) and the side water outlet pipe (1) with the outer connecting cylinder (10) are all provided with arc transitions.

5. A large flow water swivel according to claim 1, characterized in that The number of the through grooves (11) is 4-6, the through grooves (11) are uniformly distributed along the circumferential direction of the inner connecting cylinder (9), and the edges of the through grooves (11) are all subjected to round corner treatment.

6. A large flow water swivel according to claim 1, characterized in that The inner connecting cylinder (9), the outer connecting cylinder (10), the central water inlet pipe (3), the central water outlet pipe (4), the side water inlet pipe (2), the side water outlet pipe (1), the pressing plate (5) and the sealing plate (12) are made of 304 stainless steel, and the surfaces are subjected to chrome plating treatment, the thickness of the chrome plating layer is 0.01-0.02 mm, and the surface hardness of the chrome plating layer is not less than HV800.

7. A large flow water swivel according to claim 1, characterized in that The number of the second sealing rings (7) is 2-3, and the second sealing rings (7) are uniformly distributed along the axis direction of the central water inlet pipe (3).

8. A large flow water swivel according to claim 1, characterized in that The ports of the side water inlet pipe (2) and the side water outlet pipe (1) adopt quick connection structures, the quick connection structure comprises a connector body, a clamping sleeve and an elastic sealing ring, the clamping sleeve can slide along the axis of the connector body, the elastic sealing ring is extruded by the clamping sleeve to realize the sealing connection with an external pipeline, the elastic sealing ring is made of nitrile rubber, and the outer periphery of the connector body is provided with anti-skid lines.

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