Rotary joint

Abstract

The utility model discloses a rotary joint which comprises a shell, a water outlet pipe and a water inlet pipe. A water outlet communicated with the inner cavity of the shell is formed in the peripheral wall of the shell. The water outlet end of the water outlet pipe is inserted into the inner cavity of the shell, and the water inlet end of the water outlet pipe communicates with the end, away from the roller body, of the roller pipe. The water inlet pipe simultaneously penetrates through the shell, the water outlet pipe and the roller pipe, the water outlet end of the water inlet pipe is located in the roller pipe, and the through hole is located between the end, away from the roller body, of the roller pipe and the water outlet end of the water inlet pipe. When the roller pipe rotates to drive the roller body to rotate, the water outlet pipe and the water inlet pipe rotate relative to the shell along with the roller pipe, liquid enters the roller pipe through the water inlet pipe and then flows into the roller body, and the liquid in the roller body enters the roller pipe through the through hole, then flows into the water outlet pipe, then enters the inner cavity of the shell through the water outlet pipe and finally flows out through the water outlet. Therefore, cooling and heat exchange of the liquid to the roller body are completed. The rotary joint can prevent the inner walls of the water inlet pipe and the roller pipe from being damaged, so that the maintenance cost and the maintenance difficulty are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary joints, in particular to a rotary joint. Background Art

[0002] When a cooling roller with liquid temperature control is connected to a rotary joint, the water inlet pipe of the rotary joint is inserted into the cooling roller and is dynamically sealed with the inner wall of the cooling roller using wear-resistant materials. After a certain period of use, the wear-resistant materials at the interface between the water inlet pipe of the rotary joint and the roller will wear or even fail, causing the water inlet pipe to wear and damage due to poor matching. In addition, since the worn part is inside the roller, the difficulty and cost of maintenance are very high. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the utility model provides a rotary joint.

[0004] The utility model provides a rotary joint installed on a cooling roller, wherein the cooling roller comprises a roller body and a roller tube, one end of the roller tube is inserted into the roller body and communicated with the inner cavity of the roller body, the roller tube is fixedly connected to the roller body, and a through hole is provided on the peripheral wall of the roller tube to communicate the inner cavity of the roller body with the inner cavity of the roller tube. The rotary joint comprises:

[0005] A shell, wherein the peripheral wall of the shell is provided with a water outlet communicating with the inner cavity of the shell;

[0006] A water outlet pipe, wherein the water outlet end of the water outlet pipe is inserted into the inner cavity of the shell, the water outlet pipe is rotatably connected to the shell, the water inlet end of the water outlet pipe is communicated with an end of the roller tube away from the roller body, and the water outlet pipe is fixedly connected to the roller tube;

[0007] A water inlet pipe, wherein the water inlet pipe is simultaneously passed through the shell, the water outlet pipe and the roller tube, the water inlet pipe is rotatably connected to the shell, the water inlet pipe is fixedly connected to the water outlet pipe, the water outlet end of the water inlet pipe is located in the roller tube, and the through hole is located between an end of the roller tube away from the roller body and the water outlet end of the water inlet pipe.

[0008] The rotary joint according to the embodiment of the present utility model has at least the following technical effects: The rotary joint is installed on the cooling roll. When the roll tube rotates to drive the roll body to rotate, the water outlet pipe and the water inlet pipe rotate relative to the housing following the roll tube. The liquid enters the roll tube through the water inlet pipe and then flows into the roll body. The liquid located in the roll body enters the roll tube through the through hole and then flows into the water outlet pipe. Then, it enters the inner cavity of the housing through the water outlet pipe and finally flows out through the water outlet, thereby completing the cooling heat exchange of the liquid to the roll body. During this process, the water inlet pipe is relatively stationary with respect to the roll tube, that is, the water outlet end of the water inlet pipe does not wear against the roll tube, thereby avoiding damage to the inner walls of the water inlet pipe and the roll tube, and reducing the maintenance cost and maintenance difficulty.

[0009] According to some embodiments of the present utility model, the right end of the housing is open, the left end of the water outlet pipe is inserted into the inner cavity of the housing, an installation area is formed between the outer peripheral wall of the water outlet pipe and the inner peripheral wall of the housing, and a bearing is provided in the installation area. The bearing is sleeved on the water outlet pipe so that the water outlet pipe is rotatably connected to the housing.

[0010] According to some embodiments of the present utility model, a graphite sealing ring is provided in the housing. The graphite sealing ring is respectively connected to the housing and the water outlet pipe. The graphite sealing ring is used to block the liquid from flowing out of the right port of the housing through the installation area.

[0011] According to some embodiments of the present utility model, a wear-resistant ceramic ring is provided at the left end of the water outlet pipe. The right end of the graphite sealing ring abuts against the left end of the wear-resistant ceramic ring, and the outer peripheral wall of the graphite sealing ring fits against the inner wall of the housing.

[0012] According to some embodiments of the present utility model, a first annular protrusion is provided on the inner wall of the housing, and a second annular protrusion is provided on the outer peripheral wall of the water outlet pipe. The second annular protrusion is located between the first annular protrusion and the bearing. The first annular protrusion and the bearing limit the movement of the water outlet pipe in the left-right direction.

[0013] According to some embodiments of the present utility model, a third annular protrusion is provided inside the first annular protrusion. The third annular protrusion is located at the left end of the graphite sealing ring. A spring is provided in the housing, and an O-ring seal is provided in the housing. The spring is sleeved on the water inlet pipe. The left end of the spring is connected to the third annular protrusion, and the right end of the spring is connected to the left side of the O-ring seal. The spring is always in a compressed state. The right side of the O-ring seal is connected to the graphite sealing ring, and the outer peripheral wall of the graphite sealing ring is closely attached to the first annular protrusion.

[0014] According to some embodiments of the present utility model, an installation hole communicating with the inner cavity of the housing is provided at the left end of the housing, the water inlet pipe passes through the installation hole, the installation hole is located on the left side of the water outlet, a sealing ring is provided in the installation hole, the sealing ring is sleeved on the water inlet pipe, the inner peripheral wall of the sealing ring is attached to the outer peripheral wall of the water inlet pipe, and the outer peripheral wall of the sealing ring is attached to the hole wall of the installation hole.

[0015] According to some embodiments of the present utility model, a convex block is provided on the outer peripheral wall of the water inlet pipe, and the convex block is welded to the inner peripheral wall of the water outlet pipe.

[0016] According to some embodiments of the present utility model, a flared mouth is provided at the water outlet end of the water inlet pipe, and the maximum outer diameter of the flared mouth is smaller than the inner diameter of the roller tube.

[0017] According to some embodiments of the present utility model, the right end of the water outlet pipe is attached to the left end of the roller tube, and the water outlet pipe and the roller tube are fixedly connected by a flange.

[0018] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0019] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

[0020] Figure 1 is a schematic structural diagram of a rotary joint according to some embodiments of the present utility model;

[0021] Figure 2 is a schematic structural diagram of a rotary joint according to some embodiments of the present utility model;

[0022] Figure 3 is a schematic structural diagram of a rotary joint according to some embodiments of the present utility model;

[0023] Figure 4 is Figure 2 an enlarged schematic view of part A of

[0024] Reference Numerals in the Drawings:

[0025] Cooling roller 100, roller body 110, roller tube 120, through hole 121;

[0026] Housing 200, water outlet 201, installation area 202, bearing 203, graphite sealing ring 204, first annular convex portion 210, third annular convex portion 220, spring 230, sealing ring 240, installation hole 250, wear-resistant ceramic ring 260, O-shaped seal 270, fourth annular convex portion 280, snap ring 290;

[0027] Outlet pipe 300, second annular protrusion 310, flange 320;

[0028] Inlet pipe 400, bump 410, bell mouth 420, first annular region 430, second annular region 440. Detailed implementation manners

[0029] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0030] In the description of the present utility model, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by left, right, etc., is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0031] In the description of the present utility model, if the first and second are described only for the purpose of distinguishing technical features, it should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0032] In the description of the present utility model, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0033] The embodiments of the present utility model will be further described below with reference to the drawings.

[0034] According to some embodiments of the present utility model, with reference to Figures 1 to 3 , the rotary joint is installed on the cooling roll 100. The cooling roll 100 includes a roll body 110 and a roll tube 120. One end of the roll tube 120 is inserted into the roll body 110 and communicates with the inner cavity of the roll body 110. The roll tube 120 is fixedly connected to the roll body 110. A through hole 121 for communicating the inner cavity of the roll body 110 and the inner cavity of the roll tube 120 is provided on the peripheral wall of the roll tube 120. The through hole 121 is located inside the roll body 110, and there are several through holes 121.

[0035] The rotary joint includes a housing 200, a water outlet pipe 300, and a water inlet pipe 400. The peripheral wall of the housing 200 is provided with a water outlet 201 communicating with the inner cavity of the housing 200. The left end of the water outlet pipe 300 is inserted into the inner cavity of the housing 200. The water outlet pipe 300 is rotatably connected to the housing 200. The water inlet end of the water outlet pipe 300 communicates with one end of the roller pipe 120 away from the roller body 110, that is, the right end of the water outlet pipe 300 communicates with the left end of the roller pipe 120. The water outlet pipe 300 is fixedly connected to the roller pipe 120. The water inlet pipe 400 passes through the housing 200, the water outlet pipe 300, and the roller pipe 120 at the same time. The water inlet pipe 400 is rotatably connected to the housing 200. The water inlet pipe 400 is fixedly connected to the water outlet pipe 300. The right end of the water inlet pipe 400 is located inside the roller pipe 120. The through hole 121 is located between one end of the roller pipe 120 away from the roller body 110 and the water outlet end of the water inlet pipe 400, that is, the through hole 121 is located between the left end of the roller pipe 120 and the right end of the water inlet pipe 400. The water outlet pipe 300, the water inlet pipe 400, and the roller pipe 120 are coaxially arranged and the axial direction is the left-right direction.

[0036] It can be understood that the rotary joint is installed on the cooling roller 100. When the roller pipe 120 rotates to drive the roller body 110 to rotate, the water outlet pipe 300 and the water inlet pipe 400 rotate relative to the housing 200 following the roller pipe 120. The liquid enters the roller pipe 120 from left to right through the water inlet pipe 400, and then flows into the roller body 110 through the right end of the roller pipe 120; the liquid located in the roller body 110 enters the roller pipe 120 again through the through hole 121. At this time, the liquid is located in the first annular region 430 between the inner peripheral wall of the roller pipe 120 and the outer peripheral wall of the water inlet pipe 400, and then flows leftward to enter the water outlet pipe 300. At this time, the liquid is located in the second annular region 440 between the inner peripheral wall of the water outlet pipe 300 and the outer peripheral wall of the water inlet pipe 400. The liquid located in the second annular region 440 continues to flow leftward and then enters the inner cavity of the housing 200 and flows out through the water outlet 201, thereby completing the cooling heat exchange of the liquid to the roller body 110. During this process, the water inlet pipe 400 is relatively stationary with respect to the roller pipe 120, that is, the water outlet end of the water inlet pipe 400 does not wear with the roller pipe 120, thereby avoiding damage to the inner walls of the water inlet pipe 400 and the roller pipe 120, and reducing the maintenance cost and maintenance difficulty.

[0037] According to some embodiments of the present invention, referring to Figure 1 and Figure 2 , the right end of the housing 200 is open. The left end of the water outlet pipe 300 is inserted into the inner cavity of the housing 200. An annular installation area 202 is formed between the outer peripheral wall of the water outlet pipe 300 and the inner peripheral wall of the housing 200. A bearing 203 is provided in the installation area 202. The bearing 203 is sleeved on the water outlet pipe 300. The inner peripheral wall of the bearing 203 is connected to the water outlet pipe 300, and the outer peripheral wall of the bearing 203 is connected to the inner peripheral wall of the housing 200, so that the water outlet pipe 300 is rotatably connected to the housing 200.

[0038] Preferably, referring to Figure 4 , a fourth annular convex portion 280 is provided on the inner peripheral wall of the housing 200, and a snap ring 290 is also connected inside the housing. The fourth annular convex portion 280 is located on the left side of the bearing 203, and the snap ring 290 is located on the right side of the bearing 230. The snap ring 290 and the fourth annular convex portion 280 jointly limit the movement of the bearing 230 in the left-right direction.

[0039] According to some embodiments of the present invention, referring to Figure 1 and Figure 2 , a graphite sealing ring 204 is provided inside the housing 200. The graphite sealing ring 204 is fixedly connected to the housing 200 through a positioning pin, and the graphite sealing ring 204 is respectively connected to the housing 200 and the water outlet pipe 300. The graphite sealing ring 204 is used to seal the left end of the installation area 202 and prevent the liquid flowing out of the water outlet pipe 300 from flowing out of the right port of the housing 200 through the installation area 202.

[0040] Furthermore, referring to Figure 1 , Figure 2 and Figure 4 , a wear-resistant ceramic ring 260 is provided at the left end of the water outlet pipe 300. The right end of the graphite sealing ring 204 abuts against the left end of the wear-resistant ceramic ring 260, and the outer peripheral wall of the graphite sealing ring 204 fits against the inner wall of the housing 200. When the water outlet pipe 300 rotates, the water outlet pipe 300 rotates relative to the graphite sealing ring 204, and the graphite sealing ring 204 always presses against the left end of the water outlet pipe 300 to form a dynamic seal, ensuring that the liquid entering the housing 200 from the water outlet pipe 300 cannot enter the installation area 202.

[0041] According to some embodiments of the present invention, referring to Figure 1 and Figure 2 , a first annular convex portion 210 is provided on the inner wall of the housing 200, and a second annular convex portion 310 is provided on the outer peripheral wall of the water outlet pipe 300. The second annular convex portion 310 is located between the first annular convex portion 210 and the bearing 203. The first annular convex portion 210 and the bearing 203 cooperate together to limit the movement of the water outlet pipe 300 in the left-right direction and prevent the water outlet pipe 300 from detaching from the housing 200.

[0042] According to some embodiments of the present invention, referring to Figure 2 and Figure 4, a third annular protrusion 220 is provided inside the first annular protrusion 210. The third annular protrusion 220 is located at the left end of the graphite sealing ring 204. A spring 230 is provided inside the housing 200, and an O-ring seal 270 is provided inside the housing 200. The spring 230 is sleeved on the water inlet pipe 400. The left end of the spring 230 is connected to the third annular protrusion 220, and the right end of the spring 230 is connected to the left side of the O-ring seal 270. The spring 230 is always in a compressed state. The right side of the O-ring seal 270 is in contact with the graphite sealing ring 204, and the outer peripheral wall of the graphite sealing ring 204 is in close fit with the first annular protrusion 210. The spring 230 exerts a rightward force on the O-ring seal 270, causing the O-ring seal 270 to always closely adhere to the left end of the graphite sealing ring 204, ensuring that liquid does not enter the gap between the graphite sealing ring 204 and the housing 200 and improving the sealing performance.

[0043] According to some embodiments of the present invention, referring to Figure 1 and Figure 2 , an installation hole 250 communicating with the inner cavity of the housing 200 is provided at the left end of the housing 200. The installation hole 250 is located on the left side of the water outlet 201. The water inlet pipe 400 passes through the installation hole 250. A sealing ring 240 is provided in the installation hole 250. The sealing ring 240 is sleeved on the water inlet pipe 400. The inner peripheral wall of the sealing ring 240 is in contact with the outer peripheral wall of the water inlet pipe 400, and the outer peripheral wall of the sealing ring 240 is in contact with the hole wall of the installation hole 250. This prevents the liquid inside the housing 200 from leaking out through the gap between the installation hole 250 and the water inlet pipe 400. Preferably, the sealing ring 240 is made of graphite material to achieve dynamic sealing.

[0044] According to some embodiments of the present invention, referring to Figure 1 and Figure 2 , a convex block 410 is provided on the outer peripheral wall of the water inlet pipe 400. The convex block 410 is welded to the inner peripheral wall of the water outlet pipe 300, thereby relatively fixing the water inlet pipe 400 and the water outlet pipe 300. It should be noted that the convex block 410 is not annular to avoid obstructing the flow of liquid.

[0045] According to some embodiments of the present invention, referring to Figure 1 and Figure 2, the water outlet end of the water inlet pipe 400 is provided with a bell mouth 420. The maximum outer diameter of the bell mouth 420 is smaller than the inner diameter of the roller pipe 120, which avoids friction between the bell mouth 420 and the roller pipe 120 during assembly. At the same time, the bell mouth 420 can guide the water flow direction, and the bell mouth 420 can also block part of the liquid that enters the roller pipe 120 from the roller body 110 through the through hole 121 from flowing from left to right and entering the roller body 110 again. It can be understood that the gap between the maximum outer diameter of the bell mouth 420 and the inner wall of the roller pipe 120 is much smaller than the diameter of the through hole 121, so that most of the liquid in the water inlet pipe 400 flows from left to right into the roller pipe 120 and then continues to flow to the right into the roller body 110, avoiding water from entering the first annular region 430 from right to left through the bell mouth 420 and the inner wall of the roller pipe 120.

[0046] According to some embodiments of the present invention, referring to Figure 1 , the right end of the water outlet pipe 300 is attached to the left end of the roller pipe 120, and the water outlet pipe 300 and the roller pipe 120 are fixedly connected by a flange 320. A gasket is also provided inside the flange 320 to play a sealing role and prevent liquid from leaking through the gap between the water outlet pipe 300 and the roller pipe 120.

[0047] In the description of this specification, the description referring to the term "some embodiments" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0048] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A rotary joint is installed on a cooling roll (100), the cooling roll (100) includes a roll body (110) and a roll tube (120), one end of the roll tube (120) is inserted into the roll body (110) and communicates with the inner cavity of the roll body (110), the roll tube (120) is fixedly connected to the roll body (110), and a through hole (121) for communicating the inner cavity of the roll body (110) and the inner cavity of the roll tube (120) is provided on the peripheral wall of the roll tube (120), characterized in that, The rotary joint includes: A housing (200), on the peripheral wall of which there is a water outlet (201) communicating with the inner cavity of the housing (200); A water outlet pipe (300), the water outlet end of which is inserted into the inner cavity of the housing (200), the water outlet pipe (300) is rotatably connected to the housing (200), the water inlet end of the water outlet pipe (300) is communicated with one end of the roller pipe (120) far from the roller body (110), and the water outlet pipe (300) is fixedly connected to the roller pipe (120); A water inlet pipe (400), which penetrates through the housing (200), the water outlet pipe (300) and the roller pipe (120) at the same time, the water inlet pipe (400) is rotatably connected to the housing (200), the water inlet pipe (400) is fixedly connected to the water outlet pipe (300), the water outlet end of the water inlet pipe (400) is located inside the roller pipe (120), and the through hole (121) is located between one end of the roller pipe (120) far from the roller body (110) and the water outlet end of the water inlet pipe (400).

2. The swivel joint according to claim 1, wherein The right end of the housing (200) is open, the left end of the water outlet pipe (300) is inserted into the inner cavity of the housing (200), an installation area (202) is formed between the outer peripheral wall of the water outlet pipe (300) and the inner peripheral wall of the housing (200), and a bearing (203) is arranged in the installation area (202), and the bearing (203) is sleeved on the water outlet pipe (300) so that the water outlet pipe (300) is rotatably connected to the housing (200).

3. The swivel joint according to claim 2, characterized in that, A graphite sealing ring (204) is arranged in the housing (200), the graphite sealing ring (204) is respectively connected to the housing (200) and the water outlet pipe (300), and the graphite sealing ring (204) is used to prevent liquid from flowing out of the right port of the housing (200) through the installation area (202).

4. The swivel joint according to claim 3, characterized in that, A wear-resistant ceramic ring (260) is arranged at the left end of the water outlet pipe (300), the right end of the graphite sealing ring (204) abuts against the left end of the wear-resistant ceramic ring (260), and the outer peripheral wall of the graphite sealing ring (204) fits against the inner wall of the housing (200).

5. The swivel joint according to claim 4, characterized in that, A first annular protrusion (210) is arranged on the inner wall of the housing (200), a second annular protrusion (310) is arranged on the outer peripheral wall of the water outlet pipe (300), the second annular protrusion (310) is located between the first annular protrusion (210) and the bearing (203), and the first annular protrusion (210) and the bearing (203) limit the movement of the water outlet pipe (300) in the left-right direction.

6. The swivel joint according to claim 5, characterized in that, Inside the first annular convex portion (210), there is a third annular convex portion (220). The third annular convex portion (220) is located at the left end of the graphite sealing ring (204). Inside the housing (200), there is a spring (230). Inside the housing (200), there is an O-ring seal (270). The spring (230) is sleeved on the water inlet pipe (400). The left end of the spring (230) is connected to the third annular convex portion (220). The right end of the spring (230) is connected to the left side of the O-ring seal (270). The spring (230) is always in a compressed state. The right side of the O-ring seal (270) is in contact with the graphite sealing ring (204). The outer peripheral wall of the graphite sealing ring (204) is in close contact with the first annular convex portion (210).

7. The swivel joint according to claim 1, characterized in that, At the left end of the housing (200), there is a mounting hole (250) communicating with the inner cavity of the housing (200). The mounting hole (250) is located on the left side of the water outlet (201). The water inlet pipe (400) passes through the mounting hole (250). Inside the mounting hole (250), there is a sealing ring (240). The sealing ring (240) is sleeved on the water inlet pipe (400). The inner peripheral wall of the sealing ring (240) is in contact with the outer peripheral wall of the water inlet pipe (400). The outer peripheral wall of the sealing ring (240) is in contact with the hole wall of the mounting hole (250).

8. The swivel joint according to claim 1, characterized in that, On the outer peripheral wall of the water inlet pipe (400), there is a convex block (410). The convex block (410) is welded to the inner peripheral wall of the water outlet pipe (300).

9. The swivel joint according to claim 1, characterized in that, At the water outlet end of the water inlet pipe (400), there is a flared opening (420). The maximum outer diameter of the flared opening (420) is smaller than the inner diameter of the roller tube (120).

10. The swivel joint according to claim 1, characterized in that, The right end of the water outlet pipe (300) is in contact with the left end of the roller tube (120). The water outlet pipe (300) and the roller tube (120) are fixedly connected by a flange (320).

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