Anti-reflux rotary joint

Abstract

The utility model discloses an anti-backflow rotary joint which comprises a liquid inlet joint, a support table, a liquid outlet joint and a rotary sleeve which are sequentially connected in a matched mode. The rotating sleeve is arranged on the outer side of the liquid outlet connector in a sleeving mode, an annular limiting protrusion is arranged on the outer wall of the liquid outlet connector in the circumferential direction in a protruding mode, a clamping ring matched with the limiting protrusion is arranged on the inner wall of the rotating sleeve in the circumferential direction in a protruding mode, and the clamping ring movably abuts against one side of the limiting protrusion and rotates relative to the limiting protrusion. A liquid inlet channel, a liquid flow channel and a liquid outlet channel are arranged in the liquid inlet connector, the support table and the liquid outlet connector respectively, a first blocking piece is arranged between the liquid inlet connector and the support table, and a second blocking piece is arranged between the support table and the liquid outlet connector so that the liquid inlet channel, the liquid flow channel and the liquid outlet channel can be communicated in one direction. According to the anti-backflow rotary joint, through the cooperation of the first blocking piece and the second blocking piece, one-way conduction of liquid can be effectively controlled, and the anti-backflow function of the rotary joint is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to an anti-backflow rotary joint. Background Art

[0002] A rotary joint is a pipeline connection device, which is assembled by combining a rotating end and a fixed end. Among them, the rotating end rotates relative to the fixed end. The rotary joint can prevent the connecting pipelines connected to it from knotting and winding. During assembly, the fixed end and the rotating end of the rotary joint are respectively connected to the liquid inlet connecting pipeline and the liquid outlet connecting pipeline. Since the rotating end can rotate, during the assembly process, the liquid inlet connecting pipeline, the fixed end of the rotary joint, and the liquid outlet connecting pipeline do not need to rotate. Only rotate the rotating end of the rotary joint and connect it to the liquid outlet connecting pipeline, which can effectively prevent the liquid inlet connecting pipeline and the liquid outlet connecting pipeline from winding and knotting, and reduce the damage of the liquid inlet connecting pipeline and the liquid outlet connecting pipeline. However, most of the existing rotary joints do not have the anti-backflow function. When it is applied to the infusion pipeline, in case of pressure changes in the pipeline and other situations, the phenomenon of liquid backflow is likely to occur, thus causing trouble to the user. Therefore, the existing rotary joints have the technical defect of lacking the anti-backflow function. Content of the Utility Model

[0003] An anti-backflow rotary joint provided by the utility model aims to solve the technical defect that the existing rotary joints lack the anti-backflow function.

[0004] The utility model discloses an anti-backflow rotary joint, which comprises a liquid inlet joint, a support platform, a liquid outlet joint and a rotating sleeve that are sequentially cooperatively connected; the rotating sleeve is sleeved outside the liquid outlet joint and is rotatably connected to the liquid outlet joint, and the rotating sleeve rotates circumferentially around the liquid outlet joint; a liquid inlet channel is arranged in the liquid inlet joint, a liquid flow channel is arranged in the support platform, a liquid outlet channel is arranged in the liquid outlet joint, a first liquid passing hole for communicating with the liquid flow channel is arranged on the peripheral edge of the channel wall of the liquid inlet channel, and a second liquid passing hole for communicating with the liquid outlet channel is arranged on the peripheral edge of the channel wall of the liquid flow channel; a first liquid passing cavity is formed between the liquid inlet joint and the support platform, and a first stop member for conducting or blocking the first liquid passing hole is arranged in the first liquid passing cavity; a second liquid passing cavity is formed between the support platform and the liquid outlet joint, and a second stop member for conducting or blocking the second liquid passing hole is arranged in the second liquid passing cavity, so that the liquid inlet channel, the first liquid passing hole, the liquid flow channel, the second liquid passing hole and the liquid outlet channel are unidirectionally conducted.

[0005] Among them, the first stop member includes: a first pressing block and a first stop piece. The first pressing block protrudes from the channel wall of the liquid inlet channel and forms a first liquid passing hole between the first pressing block and the channel wall of the liquid inlet channel. The first stop piece is provided with a first through hole. The first stop piece abuts against the lower side surface of the first pressing block, and the position of the first pressing block corresponds to the first through hole. The size of the first through hole is smaller than that of the first pressing block. The second stop member includes: a second pressing block and a second stop piece. The second pressing block protrudes from the channel wall of the liquid flow channel and forms a second liquid passing hole between the second pressing block and the channel wall of the liquid flow channel. The second stop piece is provided with a second through hole. The second stop piece abuts against the lower side surface of the second pressing block, and the position of the second pressing block corresponds to the second through hole. The size of the second through hole is smaller than that of the second pressing block.

[0006] Specifically, the first stop piece includes: a first baffle and a first retaining ring. The first baffle covers one end of the first retaining ring. The first through hole is provided at the center position of the first baffle. The upper side surface of the first baffle abuts against the lower side surface of the first pressing block. The second stop piece includes: a second baffle and a second retaining ring. The second baffle covers one end of the second retaining ring. The second through hole is provided at the center position of the second baffle. The upper side surface of the second baffle abuts against the lower side surface of the second pressing block.

[0007] Preferably, the first stop piece and the second stop piece are silicone stop pieces.

[0008] Specifically, one end of the liquid inlet joint close to the support platform is provided with a first insertion portion. The first end of the support platform is provided with a first accommodation groove adapted to the first insertion portion. The first insertion portion is inserted into the first accommodation groove and connected by ultrasonic welding. The second end of the support platform is provided with a second insertion portion. One end of the liquid outlet joint close to the support platform is provided with a second accommodation groove adapted to the second insertion portion. The second insertion portion is inserted into the second accommodation groove and connected by ultrasonic welding.

[0009] Preferably, the first accommodation groove includes a first groove wall and a second groove wall arranged in parallel. The second groove wall is arranged inside the first groove wall. The outer peripheral surface of the first retaining ring abuts against the second groove wall. The first end of the support platform is further provided with an annular plate. The annular plate is arranged inside the second groove wall and a third accommodation groove is formed between the annular plate and the second groove wall. The first retaining ring is arranged in the third accommodation groove.

[0010] Specifically, the liquid outlet joint includes a first connecting plate, a first annular layer, a second annular layer, and a liquid outlet pipe. The liquid outlet pipe is perpendicularly arranged with respect to the first connecting plate. The first connecting plate is provided with a liquid outlet hole communicating with the liquid outlet channel. The first annular layer and the second annular layer are arranged at one end of the first connecting plate away from the liquid outlet pipe. The first annular layer and the second annular layer are respectively perpendicularly arranged with respect to the first connecting plate, and the second annular layer is arranged inside the first annular layer. A second accommodating groove is formed between the first annular layer and the second annular layer. The second accommodating groove is cooperatively connected with the support platform. The outer peripheral surface of the second retaining ring abuts against the second annular layer, and one end of the second retaining ring away from the second baffle abuts against the first connecting plate; the rotating sleeve is sleeved outside the liquid outlet pipe, and the rotating sleeve is movably abutted against the first connecting plate.

[0011] Preferably, a circular ring-shaped limiting protrusion is circumferentially convex on the outer wall of the liquid outlet pipe, and a clamping ring adapted to the limiting protrusion is circumferentially convex on the inner wall of the rotating sleeve. The clamping ring is movably abutted against one side of the limiting protrusion facing the first connecting plate, and the clamping ring and the limiting protrusion rotate relative to each other, so that the rotating sleeve rotates circumferentially around the liquid outlet pipe.

[0012] Specifically, the rotating sleeve includes a butting sleeve and a fitting sleeve connected to each other. The butting sleeve is movably abutted against the first connecting plate. The clamping ring protrudes from the inner wall of the butting sleeve. The fitting sleeve is arranged at one end of the rotating sleeve away from the first connecting plate. The inner wall of the fitting sleeve is provided with a first thread. The fitting sleeve includes a first opening, and the first opening is arranged at one end of the fitting sleeve away from the butting sleeve. The end of the liquid outlet pipe away from the first connecting plate protrudes from the end face of the opening end of the first opening.

[0013] Preferably, anti-slip ribs are provided on the outer wall of the butting sleeve.

[0014] An anti-backflow rotating joint disclosed by the present utility model includes a liquid inlet joint, a support platform, a liquid outlet joint, and a rotating sleeve that are sequentially cooperatively connected; the liquid outlet joint includes a liquid outlet pipe, the rotating sleeve is sleeved outside the liquid outlet pipe, a circular ring-shaped limiting protrusion is circumferentially arranged on the outer wall of the liquid outlet pipe, a clamping ring adapted to the limiting protrusion is circumferentially convex on the inner wall of the rotating sleeve, the clamping ring is movably abutted against one side of the limiting protrusion and the clamping ring and the limiting protrusion rotate relative to each other to realize the rotational connection between the rotating sleeve and the liquid outlet joint. A first pressing block and a first stop piece are arranged between the liquid inlet joint and the support platform, and a second pressing block and a second stop piece are arranged between the support platform and the liquid outlet joint. In the present utility model, through the cooperation of the first pressing block and the first stop piece and the cooperation of the second pressing block and the second stop piece, the one-way conduction of the liquid can be effectively controlled, and the technical defect that the conventional rotating joint does not have the anti-backflow function is solved. Description of the Drawings

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is the overall structure diagram of the anti-backflow rotary joint disclosed in the embodiments of the present invention;

[0017] Figure 2 It is the sectional view of the anti-backflow rotary joint disclosed in the embodiments of the present invention;

[0018] Figure 3 It is the sectional view of the liquid inlet joint, the first stop member, the support platform, and the second pressing block disclosed in the embodiments of the present invention;

[0019] Figure 4 It is the sectional view of the support platform, the second stop member, and the liquid outlet joint disclosed in the embodiments of the present invention;

[0020] Figure 5 It is the sectional view of the liquid outlet joint and the rotary sleeve disclosed in the embodiments of the present invention;

[0021] Figure 6 Disclosed in the embodiments of the present invention Figure 5 The enlarged structure diagram of part A therein;

[0022] Reference numerals:

[0023] 1. Liquid inlet joint; 11. Liquid inlet channel; 12. First liquid passing hole; 13. First insertion part; 2. Support platform; 21. Liquid flow channel; 22. Second liquid passing hole; 23. First accommodation groove; 231. First groove wall; 232. Second groove wall; 24. Second insertion part; 25. Ring plate; 26. Third accommodation groove; 3. Liquid outlet joint; 31. Liquid outlet channel; 32. First connection plate; 321. Liquid outlet hole; 33. Liquid outlet pipe; 331. Limit protrusion; 3311. First abutting surface; 34. Second accommodation groove; 35. First annular layer; 36. Second annular layer; 4. Rotary sleeve; 40. Assembly space; 41. Abutting sleeve; 411. Clamping ring; 4111. Connection block; 4112. Guide ring; 412. Anti-slip rib; 42. Fitting sleeve; 421. First thread; 422. First opening; 5. First stop member; 51. First pressing block; 52. First stop piece; 521. First through hole; 522. First baffle; 523. First retaining ring; 6. Second stop member; 61. Second pressing block; 62. Second stop piece; 621. Second through hole; 622. Second baffle; 623. Second retaining ring; Detailed implementation manners

[0024] Next, in combination with the accompanying drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0026] It should also be understood that the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0027] It should be further understood that the term "and / or" used in the specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the related listed items, and includes these combinations.

[0028] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

[0029] The present invention discloses an anti-counterflow rotary joint, as Figure 1 shown, including a liquid inlet joint 1, a support platform 2, a liquid outlet joint 3, and a rotating sleeve 4 that are sequentially fitted and connected; the rotating sleeve 4 is sleeved outside the liquid outlet joint 3 and is rotatably connected to the liquid outlet joint 3. The rotating sleeve 4 rotates circumferentially around the liquid outlet joint 3. The liquid inlet connection pipeline is connected to the liquid inlet joint 1, and the liquid outlet connection pipeline is connected to the rotating sleeve 4. During assembly, the liquid inlet connection pipeline, the liquid inlet joint 1, and the liquid outlet connection pipeline are all fixed, and the rotating sleeve 4 rotates and is connected to the liquid outlet connection pipeline, which can prevent the liquid outlet connection pipeline and the liquid inlet connection pipeline from knotting and winding.

[0030] Specifically, please refer to Figure 2, a liquid inlet joint 1 is internally provided with a liquid inlet channel 11, a support platform 2 is internally provided with a liquid flow channel 21, and a liquid outlet joint 3 is internally provided with a liquid outlet channel 31. A first liquid passing hole 12 for communicating with the liquid flow channel 21 is provided on the peripheral edge of the channel wall of the liquid inlet channel 11. A second liquid passing hole 22 for communicating with the liquid outlet channel 31 is provided on the peripheral edge of the channel wall of the liquid flow channel 21. The liquid inlet channel 11, the first liquid passing hole 12, the liquid flow channel 21, the second liquid passing hole 22, and the liquid outlet channel 31 are sequentially communicated. The liquid flows in from the liquid inlet channel 11, flows through the liquid flow channel 21, and flows out from the liquid outlet channel 31.

[0031] Among them, a first liquid passing cavity is formed between the liquid inlet joint 1 and the support platform 2, and a first stop member 5 for conducting or blocking the first liquid passing hole 12 is provided in the first liquid passing cavity; a second liquid passing cavity is formed between the support platform 2 and the liquid outlet joint 3, and a second stop member 6 for conducting or blocking the second liquid passing hole 22 is provided in the second liquid passing cavity; during the liquid inlet process, by conducting or blocking the first liquid passing hole 12 through the first stop member 5 and conducting or blocking the second liquid passing hole 22 through the second stop member 6, the communication or blockage of the liquid inlet channel 11, the liquid flow channel 21, and the liquid outlet channel 31 can be realized, so as to realize the one-way conduction of the liquid and prevent the liquid from flowing back. It can be understood that the first stop member 5 and the second stop member 6 for one-way conduction of the liquid have various implementation manners. In some embodiments, the first stop member 5 and the second stop member 6 can be one-way control valve cores such as butterfly valve cores and ball valve cores, or elastic stop members, and the one-way conduction of the liquid is realized through the elastic deformation of the elastic stop members.

[0032] In an embodiment of the present application, as Figures 3 - 4 shown, the first stop member 5 includes: a first pressing block 51 and a first stop piece 52. The first pressing block 51 protrudes from the channel wall of the liquid inlet channel 11 and forms a first liquid passing hole 12 with the channel wall of the liquid inlet channel 11. Specifically, the first pressing block 51 is connected to the channel wall of the liquid inlet channel 11 through a first connecting portion, and the first connecting portion is provided with a first liquid passing hole 12, and the number of the first liquid passing holes 12 is multiple; the first stop piece 52 is provided with a first through hole 521, and the upper side surface of the first stop piece 52 abuts against the lower side surface of the first pressing block 51. When the liquid flows in the forward direction, the liquid sequentially flows through the first liquid passing hole 12 and the first through hole 521 and enters the liquid flow channel 21. The position of the first pressing block 51 corresponds to the first through hole 521, and the size of the first through hole 521 is smaller than that of the first pressing block 51. When the liquid flows in the reverse direction, the first pressing block 51 can fully block the first through hole 521 to prevent the liquid from continuing to flow into the liquid inlet channel 11.

[0033] The second stop member 6 includes: a second pressing block 61 and a second stop piece 62. The second pressing block 61 protrudes from the channel wall of the liquid flow channel 21 and forms a second liquid passing hole 22 between the second pressing block 61 and the channel wall of the liquid flow channel 21. Specifically, the second pressing block 61 is connected to the channel wall of the liquid flow channel 21 through a second connecting portion, and the second connecting portion is provided with a plurality of second liquid passing holes 22. The second stop piece 62 is provided with a second through hole 621. The upper side surface of the second stop piece 62 abuts against the lower side surface of the second pressing block 61. When the liquid flows in the forward direction, the liquid sequentially flows through the second liquid passing holes 22 and the second through hole 621 and enters the liquid outlet channel 31. The position of the second pressing block 61 corresponds to the second through hole 621, and the size of the second through hole 621 is smaller than that of the second pressing block 61, so that when the liquid flows in the reverse direction, the second pressing block 61 fully blocks the second through hole 621 to prevent the liquid from continuing to flow into the liquid flow channel 21.

[0034] The first stop piece 52 and the second stop piece 62 are silicone stop pieces. The silicone stop pieces have a certain elasticity. Under the action of hydraulic pressure, the silicone stop pieces can deform. When the liquid flows in the forward direction, under the action of gravity, the silicone stop pieces deform and form a gap between the first pressing block 51 and the second pressing block 61, and the liquid flows out through the gap to realize the forward flow of the liquid. When the liquid flows in the reverse direction, the silicone stop pieces can deform and closely fit with the first pressing block 51 and the second pressing block 61 to block the reverse flow of the liquid.

[0035] In the specific implementation process, when the liquid flows in the forward direction, the liquid flows into the liquid inlet channel 11 and flows through the first liquid passing hole 12 to the first stop piece 52. Under the action of the gravity of the liquid, the liquid presses down the first stop piece 52, and the first stop piece 52 deforms and moves away from the first pressing block 51. A gap is formed between the first stop piece 52 and the first pressing block 51, and the liquid flows into the liquid flow channel 21 from the gap. Under the action of the gravity of the liquid, the liquid presses down the second stop piece 62, and the second stop piece 62 deforms and moves away from the second pressing block 61. A gap is formed between the second stop piece 62 and the second pressing block 61, and the liquid flows into the liquid outlet channel 31 from the gap to realize the forward flow of the liquid. If the pressure in the pipeline changes and causes the liquid to flow in the reverse direction, the liquid flows in from the liquid outlet channel 31. Under the action of hydraulic pressure, the second stop piece 62 moves towards the second pressing block 61, and the second pressing block 61 blocks the second through hole 621, which can prevent the liquid from continuing to flow into the liquid flow channel 21. Part of the liquid flowing into the liquid flow channel 21 presses the first stop piece 52 towards the first pressing block 51, and the first pressing block 51 blocks the first through hole 521, which can fully block the liquid from flowing into the liquid inlet channel 11, thereby realizing the one-way conduction of the liquid and preventing the reverse flow of the liquid.

[0036] Please refer to Figures 2 - 5, one end of the liquid inlet joint 1 close to the support platform 2 is provided with a first insertion part 13, the first end of the support platform 2 is provided with a first accommodation groove 23 adapted to the first insertion part 13, the positions of the first insertion part 13 and the first accommodation groove 23 correspond to each other, the first insertion part 13 is inserted into the first accommodation groove 23 and connected by ultrasonic welding; the second end of the support platform 2 is provided with a second insertion part 24, the first end and the second end of the support platform 2 are oppositely arranged, one end of the liquid outlet joint 3 close to the support platform 2 is provided with a second accommodation groove 34 adapted to the second insertion part 24, the positions of the second accommodation groove 34 and the second insertion part 24 correspond to each other, the second insertion part 24 is inserted into the second accommodation groove 34 and connected by ultrasonic welding. The ultrasonic welding method has the advantages of high welding strength and good sealing effect, which can effectively lock the liquid inlet joint 1, the support platform 2 and the liquid outlet joint 3, and prevent the rotary joint from disengaging when being collided or twisted during use, resulting in liquid leakage; in this embodiment, the first insertion part 13 and the second insertion part 24 are annular insertion layers, the first accommodation groove 23 and the second accommodation groove 34 are annular accommodation grooves adapted to the annular insertion layers, and the annular insertion layers are inserted into the annular accommodation grooves.

[0037] Specifically, please refer to Figures 2 - 3 , the first stop piece 52 includes: a first baffle 522 and a first retaining ring 523. The first baffle 522 covers one end of the first retaining ring 523. The first through hole 521 is arranged at the center position of the first baffle 522. The side surface of the first baffle 522 away from the first retaining ring 523 abuts against the lower side surface of the first pressing block 51; the second stop piece 62 includes: a second baffle 622 and a second retaining ring 623. The second baffle 622 covers one end of the second retaining ring 623. The second through hole 621 is arranged at the center position of the second baffle 622. The side surface of the second baffle 622 away from the second retaining ring 623 abuts against the lower side surface of the second pressing block 61.

[0038] Among them, the first accommodation groove 23 includes a first groove wall 231 and a second groove wall 232 arranged in parallel. The second groove wall 232 is arranged inside the first groove wall 231. A first accommodation groove 23 is formed between the first groove wall 231 and the second groove wall 232. The outer peripheral surface of the first retaining ring 523 abuts against the second groove wall 232. The first end of the support platform 2 is further provided with an annular plate 25. The annular plate 25 is arranged inside the second groove wall 232. The annular plate 25 is arranged in parallel with the second groove wall 232 and a third accommodation groove 26 is formed between the annular plate 25 and the second groove wall 232. The first retaining ring 523 is clamped in the third accommodation groove 26 to limit the first stop piece 52 and prevent the position of the first stop piece 52 from changing with the liquid flow.

[0039] Please refer to Figures 4 - 5, the liquid outlet joint 3 includes a first connecting plate 32, a first annular layer 35, a second annular layer 36, and a liquid outlet pipe 33. The liquid outlet pipe 33 is perpendicularly arranged with respect to the first connecting plate 32. The first connecting plate 32 is provided with a liquid outlet hole 321 communicating with the liquid outlet channel 31. The first annular layer 35 and the second annular layer 36 are arranged at one end of the first connecting plate 32 away from the liquid outlet pipe 33. The first annular layer 35 and the second annular layer 36 are respectively perpendicularly arranged with respect to the first connecting plate 32, and the second annular layer 36 is arranged inside the first annular layer 35. A second accommodating groove 34 is formed between the first annular layer 35 and the second annular layer 36. The second accommodating groove 34 is cooperatively connected with the support platform 2. The outer peripheral surface of the second retaining ring 623 abuts against the second annular layer 36. One end of the second retaining ring 623 away from the second baffle 622 abuts against the first connecting plate 32 to limit the second retaining piece 62 and prevent the position of the second retaining piece 62 from changing with the liquid flow. Specifically, the liquid outlet hole 321 is arranged inside the second annular layer 36, and the position of the liquid outlet hole 321 corresponds to the position of the second through hole 621; the rotating sleeve 4 is sleeved outside the liquid outlet pipe 33. The rotating sleeve 4 is arranged parallel to the liquid outlet pipe 33, and an assembly space 40 is formed between the rotating sleeve 4 and the liquid outlet pipe 33 to ensure that the rotating sleeve 4 can rotate flexibly. The rotating sleeve 4 is movably abutted against the first connecting plate 32 to limit the rotating sleeve 4. Specifically, the rotating sleeve 4 is movably abutted against one side of the first connecting plate 32 away from the second accommodating groove 34. A fitting gap is also provided at the abutting position between the rotating sleeve 4 and the first connecting plate 32 to enable the rotating sleeve 4 to rotate flexibly and prevent the rotating sleeve 4 from getting stuck.

[0040] In one embodiment, a circular limiting protrusion 331 is circumferentially protruded on the outer wall of the liquid outlet pipe 33. Specifically, please refer to Figure 6 , the limiting protrusion 331 includes a first abutting surface 3311 perpendicular to the liquid outlet pipe 33. The first abutting surface 3311 is arranged on the side of the limiting protrusion 331 facing the first connecting plate 32. A clamping ring 411 adapted to the limiting protrusion 331 is circumferentially protruded on the inner wall of the rotating sleeve 4. The clamping ring 411 is movably abutted against the first abutting surface 3311 of the limiting protrusion 331 to limit the rotating sleeve 4. The clamping ring 411 is rotatably connected to the limiting protrusion 331, and the clamping ring 411 rotates relative to the limiting protrusion 331. Specifically, the clamping ring 411 includes a connected connecting block 4111 and a guiding ring 4112. The connecting block 4111 is connected to the inner wall surface of the rotating sleeve 4. The guiding ring 4112 is sleeved outside the liquid outlet pipe 33. One end of the guiding ring 4112 is connected to the connecting block 4111, and the other end of the guiding ring 4112 is movably abutted against the first abutting surface 3311 to limit the guiding ring 4112. A fitting gap is also provided at the abutting position between the guiding ring 4112 and the first abutting surface 3311 to ensure that the guiding ring 4112 rotates flexibly around the liquid outlet pipe 33 and enables the rotating sleeve 4 to rotate circumferentially flexibly around the liquid outlet pipe 33.

[0041] Among them, the rotating sleeve 4 includes an abutting sleeve 41 and a fitting sleeve 42 which are connected. Please refer to Figure 5 . The abutting sleeve 41 abuts against the first connecting plate 32 movably, and a fitting gap is provided at the abutting position. Specifically, the abutting sleeve 41 abuts against the side of the first connecting plate 32 away from the second accommodating groove 34. A clamping ring 411 protrudes from the inner wall surface of the abutting sleeve 41. The fitting sleeve 42 is arranged at one end of the rotating sleeve 4 away from the first connecting plate 32. The inner wall of the fitting sleeve 42 is provided with a first thread 421 for connecting a liquid outlet connecting pipe whose outer wall at the other end is provided with a second thread adapted to the first thread 421. The threaded connection can make the connection between the fitting sleeve 42 and the liquid outlet connecting pipe closer and firmer, preventing the liquid outlet connecting pipe from falling off during use. The fitting sleeve 42 further includes a first opening 422 which is opened at one end of the fitting sleeve 4 away from the abutting sleeve 41. The end of the liquid outlet pipe 33 away from the first connecting plate 32 protrudes from the end surface of the opening end of the first opening 422. During assembly, the liquid outlet pipe 33 is inserted into the liquid outlet connecting pipe, and then the rotating sleeve 4 is rotated to screw the liquid outlet connecting pipe into the first opening 422 of the fitting sleeve 42, and the installation is completed.

[0042] Specifically, the outer wall of the abutting sleeve 41 is further provided with anti-slip ribs 412. As Figure 1 shown, the arrangement direction of the anti-slip ribs 412 is perpendicular to the rotation direction of the rotating sleeve 4. The anti-slip ribs 412 can prevent the rotating sleeve 4 from slipping out of the user's hand during assembly.

[0043] In this embodiment, the liquid inlet joint 1, the support platform 2, and the liquid outlet joint 3 are sequentially connected and matched. The rotating sleeve 4 is sleeved outside the liquid outlet joint 3 and is rotatably connected to the liquid outlet joint 3. The liquid inlet joint 1 is connected to the liquid inlet pipeline, and the rotating sleeve 4 is connected to the liquid outlet pipeline. A liquid inlet channel 11 is provided inside the liquid inlet joint 1, a liquid flow channel 21 is provided inside the support platform 2, and a liquid outlet channel 31 is provided inside the liquid outlet joint 3. A first pressing block 51 protrudes from the channel wall of the liquid inlet channel 11. The first stop piece 52 is arranged between the liquid inlet joint 1 and the support platform 2, and the upper side of the first stop piece 52 abuts against the lower side of the first pressing block 51. The first stop piece 52 is provided with a first through hole 521, and the position of the first through hole 521 corresponds to that of the first pressing block 51. A second pressing block 61 protrudes from the channel wall of the liquid flow channel 21. The second stop piece 62 is arranged between the support platform 2 and the liquid outlet joint 3, and the upper side of the second stop piece 62 abuts against the second pressing block 61. The second stop piece 62 is provided with a second through hole 621, and the position of the second through hole 621 corresponds to that of the second pressing block 61. When the liquid flows forward, it flows in from the liquid inlet channel 11. Under the action of the liquid gravity, the liquid presses down the first stop piece 52. The first stop piece 52 deforms and moves away from the first pressing block 51 to form a gap. The liquid flows into the liquid flow channel 21 from the gap. Under the action of the liquid gravity, the second stop piece 62 is pressed down. The second stop piece 62 deforms and moves away from the second pressing block 61 to form a gap. The liquid flows into the liquid outlet channel 31 from the gap, realizing the forward flow of the liquid. In case of liquid backflow, the liquid flows in from the liquid outlet channel 31. Under the action of the hydraulic pressure, the second stop piece 62 moves towards the second pressing block 61. The second pressing block 61 blocks the second through hole 621, preventing the liquid from flowing into the liquid flow channel 21. Part of the liquid flowing into the liquid flow channel 21 presses the first stop piece 52 towards the first pressing block 51, and the first pressing block 51 blocks the first through hole 521, fully blocking the liquid from flowing into the liquid inlet channel 11. The liquid outlet joint 3 includes a first connecting plate 32, a first annular layer 35, a second annular layer 36, and a liquid outlet pipe 33. The liquid outlet pipe 33 is perpendicularly arranged with respect to the first connecting plate 32. The rotating sleeve 4 is in movable abutment with the first connecting plate 32. A circular limiting protrusion 331 is provided on the outer wall of the liquid outlet pipe 33 along the circumferential direction. A clamping ring 411 adapted to the limiting protrusion 331 protrudes from the inner wall of the rotating sleeve 4 along the circumferential direction. The clamping ring 411 is in movable abutment with one side of the limiting protrusion 331. The clamping ring 411 and the limiting protrusion 331 can rotate relative to each other to enable the rotating sleeve 4 to rotate around the liquid outlet joint 3. During assembly, the liquid inlet pipeline, the liquid inlet joint 1, the support platform 2, and the liquid outlet joint 3 all remain stationary. Rotate the rotating sleeve 4 to screw the end of the liquid outlet pipeline into the rotating sleeve 4, and the assembly is completed.

[0044] A reverse-flow prevention rotary joint disclosed by the utility model comprises a liquid inlet joint, a support platform, a liquid outlet joint and a rotary sleeve which are sequentially and cooperatively connected; the liquid outlet joint comprises a liquid outlet pipe, the rotary sleeve is sleeved outside the liquid outlet pipe, a circular limiting protrusion is arranged on the outer wall of the liquid outlet pipe along the circumferential direction, a clamping ring adapted to the limiting protrusion is protruded on the inner wall of the rotary sleeve along the circumferential direction, the clamping ring is movably abutted against one side of the limiting protrusion and relatively rotates with the limiting protrusion to realize the rotational connection between the rotary sleeve and the liquid outlet joint, a first pressing block and a first stop piece are arranged between the liquid inlet joint and the support platform, and a second pressing block and a second stop piece are arranged between the support platform and the liquid outlet joint. By the cooperation of the first pressing block and the first stop piece and the cooperation of the second pressing block and the second stop piece, the one-way conduction of liquid can be effectively controlled, and the reverse-flow prevention function of the rotary joint can be realized, effectively solving the technical problem that a conventional rotary joint does not have the reverse-flow prevention function.

[0045] As mentioned above, the above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any equivalent modifications or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A backflow prevention rotary joint, characterized in that: It includes a liquid inlet joint, a support platform, a liquid outlet joint and a rotating sleeve that are sequentially connected; the rotating sleeve is sleeved on the outer side of the liquid outlet joint and is rotatably connected to the liquid outlet joint, and the rotating sleeve rotates around the circumference of the liquid outlet joint; The liquid inlet joint is provided with a liquid inlet channel, the support platform is provided with a liquid flow channel, the liquid outlet joint is provided with a liquid outlet channel, the peripheral edge of the channel wall of the liquid inlet channel is provided with a first liquid hole for connecting with the liquid flow channel, and the peripheral edge of the channel wall of the liquid flow channel is provided with a second liquid hole for connecting with the liquid outlet channel; A first liquid passage cavity is defined between the liquid inlet joint and the support platform, and a first stopper is provided in the first liquid passage cavity for conducting or blocking the first liquid passage hole. A second liquid passage cavity is defined between the support platform and the liquid outlet joint, and a second stopper is provided in the second liquid passage cavity for conducting or blocking the second liquid passage hole, so that the liquid inlet channel, the first liquid passage hole, the liquid flow channel, the second liquid passage hole, and the liquid outlet channel are unidirectionally conductive.

2. The anti-backflow rotary joint according to claim 1, characterized in that: The first stopper comprises: a first pressing block and a first stopping sheet, wherein the first pressing block is convexly arranged on the channel wall of the liquid inlet channel and forms a first liquid passage hole with the channel wall of the liquid inlet channel, and the first stopping sheet is provided with a first through hole, the first stopping sheet abuts against the lower side surface of the first pressing block and the position of the first pressing block corresponds to the first through hole, and the size of the first through hole is smaller than the first pressing block; The second stop member includes: a second pressure block and a second stop plate. The second pressure block is protruded from the channel wall of the liquid flow channel and forms a second liquid hole with the channel wall of the liquid flow channel. The second stop plate is provided with a second through hole. The second stop plate abuts against the lower side surface of the second pressure block and the position of the second pressure block corresponds to the second through hole. The size of the second through hole is smaller than the second pressure block.

3. The anti-backflow rotary joint according to claim 2, characterized in that: The first stop plate includes: a first baffle plate and a first baffle ring, the first baffle cover is arranged at one end of the first baffle ring, the first through hole is arranged at the center position of the first baffle plate, and the upper side surface of the first baffle plate abuts against the lower side surface of the first pressure block; the second stop plate includes: a second baffle plate and a second baffle ring, the second baffle cover is arranged at one end of the second baffle ring, the second through hole is arranged at the center position of the second baffle plate, and the upper side surface of the second baffle plate abuts against the lower side surface of the second pressure block.

4. The anti-backflow rotary joint according to claim 3, characterized in that: The first stopper sheet and the second stopper sheet are silicone stopper sheets.

5. The anti-backflow rotary joint according to claim 3, characterized in that: A first plug-in portion is provided at one end of the liquid inlet joint close to the bracket platform, a first accommodating groove matched with the first plug-in portion is provided at the first end of the bracket platform, the first plug-in portion is inserted in the first accommodating groove and connected by ultrasonic welding; a second plug-in portion is provided at the second end of the bracket platform, and a second accommodating groove matched with the second plug-in portion is provided at one end of the liquid outlet joint close to the bracket platform, the second plug-in portion is inserted in the second accommodating groove and connected by ultrasonic welding.

6. The anti-backflow rotary joint according to claim 5, characterized in that: The first accommodating groove includes a first groove wall and a second groove wall which are arranged in parallel. The second groove wall is arranged on the inner side of the first groove wall. The outer peripheral surface of the first retaining ring abuts against the second groove wall. The first end of the bracket station is also provided with an annular plate, which is arranged on the inner side of the second groove wall and a third accommodating groove is formed between the annular plate and the second groove wall. The first retaining ring is arranged in the third accommodating groove.

7. The anti-backflow rotary joint according to claim 5, characterized in that: The liquid outlet joint includes a first connecting plate, a first annular layer, a second annular layer, and a liquid outlet pipe. The liquid outlet pipe is arranged perpendicularly to the first connecting plate. The first connecting plate is provided with a liquid outlet hole connected to the liquid outlet channel. The first annular layer and the second annular layer are arranged at one end of the first connecting plate away from the liquid outlet pipe. The first annular layer and the second annular layer are respectively arranged perpendicularly to the first connecting plate and the second annular layer is arranged on the inner side of the first annular layer. A second accommodating groove is formed between the first annular layer and the second annular layer. The second accommodating groove is cooperatively connected with the bracket platform. The outer peripheral surface of the second retaining ring abuts against the second annular layer, and the end of the second retaining ring away from the second baffle abuts against the first connecting plate. The rotating sleeve is sleeved on the outer side of the liquid outlet pipe, and the rotating sleeve is movably abutted against the first connecting plate.

8. The anti-backflow rotary joint according to claim 7, characterized in that: The outer wall of the liquid outlet pipe is circumferentially provided with a circular limiting protrusion, and the inner wall of the rotating sleeve is circumferentially provided with a clamping ring adapted to the limiting protrusion. The clamping ring is movably abutted against the side of the limiting protrusion facing the first connecting plate, and the clamping ring rotates relative to the limiting protrusion to enable the rotating sleeve to rotate around the circumference of the liquid outlet pipe.

9. The anti-backflow rotary joint according to claim 8, characterized in that: The rotating sleeve includes a connected abutment sleeve and an assembly sleeve, the abutment sleeve is movably abutted with the first connecting plate, the clamping ring is protruded from the inner wall of the abutment sleeve, the assembly sleeve is arranged at the end of the rotating sleeve away from the first connecting plate, the inner wall of the assembly sleeve is provided with a first thread, and the assembly sleeve also includes a first opening, the first opening is arranged at the end of the assembly sleeve away from the abutment sleeve, and the end of the liquid outlet tube away from the first connecting plate protrudes from the opening end face of the first opening.

10. The anti-backflow rotary joint according to claim 9, characterized in that: The outer wall of the abutting sleeve is provided with anti-slip convex ribs.

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