A seal for a rotary-to-stationary transition passage

Abstract

The utility model relates to a kind of sealing devices of rotating-still transition passage, including the rotating pipe that can rotate around its own axis and the stationary pipe that remains stationary, rotating pipe flange sleeve is installed outside rotating pipe, rotating pipe flange sleeve and the stationary pipe flange sleeve coaxially butts with being installed outside stationary pipe, so that rotating pipe and stationary pipe constitute continuous same flow channel, wherein, sealing washer is configured between rotating pipe flange sleeve and stationary pipe flange sleeve, sealing washer is configured as thickness at least greater than the spacing between rotating pipe downstream port and stationary pipe upstream port, to enable sealing washer can be clamped by two pipes and block the gap between two ports, so that the flow channel formed by two pipes can be in the form of upstream section rotation, downstream section still transition to transport internal liquid.

Description

Technical Field

[0001] This utility model relates to the field of fluid transmission and sealing technology, and in particular to a sealing device for a rotary-stationary transition channel. Background Technology

[0002] In cryogenic deposition 3D printing processes such as tissue engineering and bone tissue repair, printing liquids (such as cell-loaded bio-inks, bone repair composites containing hydroxyapatite particles, and high-concentration colloids) generally have high viscosity and contain insoluble functional particles. During transport, if these liquids remain stationary for extended periods, particle sedimentation and component stratification can easily occur, leading not only to fluctuations in print flow and nozzle clogging but also to uneven composition of the printed structure, affecting the repair effect. If rotary conveying is used to suppress sedimentation, the transition sealing between the upstream rotating section and the downstream stationary section (such as the fixed print head and metering components) must be addressed. The reliability of the seal at this transition point directly determines the stability of liquid delivery and printing accuracy, representing a core technical challenge in cryogenic deposition 3D printing liquid delivery systems.

[0003] Existing sealing devices for such printing liquids have significant drawbacks: traditional rotary joints, mechanical seals, or graphite-rubber seals are mostly designed for low-viscosity, particle-free fluids. When faced with high-viscosity liquids, the frictional resistance between the seal and the pipeline increases significantly, easily leading to heat generation and damage to the biological activity of the liquid (such as cell inactivation). At the same time, high-viscosity liquids can easily get stuck in the sealing gaps, causing seal failure and liquid leakage. More importantly, these sealing structures are mostly single designs of "fully rotating" or "fully stationary". The "fully rotating" structure is difficult to adapt to downstream fixed printing components, requiring additional complex transition structures and easily introducing new leakage points. The "fully stationary" structure cannot suppress the precipitation of high-viscosity liquids through rotation, resulting in frequent printing defects. All these defects require a dedicated sealing structure that can achieve a rotation-to-stationary transition to solve them.

[0004] CN116059517A discloses a bio-ink spraying device that uses gas-accelerated atomization to avoid cell inactivation caused by violent vibrations and is suitable for spraying bio-inks of a certain viscosity. However, this device focuses on optimizing the atomization process, and the liquid delivery system is a fixed pipeline design without a rotating section to suppress sedimentation and stratification of high-viscosity liquids during delivery. Furthermore, its sealing structure only addresses the interfaces of the fixed pipeline (such as the needle and flow limiter, and the housing and mounting part), lacking a sealing design for the transition between the rotating and stationary sections. When processing bone repair composite materials with higher viscosity or containing large particles, the fixed pipeline cannot prevent sedimentation through rotation, easily leading to particle blockage of the delivery channel. Moreover, existing fixed seals cannot meet the sealing requirements in the rotating-stationary transition scenario, thus affecting the stability of liquid delivery and printing quality.

[0005] Furthermore, on the one hand, there are differences in understanding among those skilled in the art; on the other hand, the applicant studied a large number of documents and patents when making this utility model, but due to space limitations, not all details and contents were listed in detail. However, this does not mean that this utility model does not have the features of these prior art. On the contrary, this utility model has all the features of the prior art, and the applicant reserves the right to add relevant prior art to the background art. Utility Model Content

[0006] To address the shortcomings of existing technologies, this invention provides a sealing device for a rotary-stationary transition channel, particularly a rotary-stationary composite channel sealing structure for the transport of high-viscosity liquids, aiming to solve one or more technical problems in the prior art.

[0007] This utility model relates to a sealing device for a rotation-stationary transition channel, including a rotating pipe capable of rotating around its own axis and a stationary pipe that remains stationary. A rotating pipe flange is installed on the outside of the rotating pipe, and the rotating pipe flange is coaxially connected with the stationary pipe flange installed on the outside of the stationary pipe, so that the rotating pipe and the stationary pipe form a continuous flow channel. A sealing gasket is disposed between the rotating pipe flange and the stationary pipe flange. The sealing gasket is configured to have a thickness at least greater than the distance between the downstream port of the rotating pipe and the upstream port of the stationary pipe, so that the sealing gasket can be clamped by the two pipes and seal the gap between the two ports. Thus, the flow channel formed by the two pipes can transition and transport the internal liquid in the form of the upstream section rotating and the downstream section remaining stationary.

[0008] Through the above design, the flow channel formed by the two pipes can transition the internal liquid by rotating the upstream section and stationary the downstream section. Specifically, the upstream rotating pipe maintains liquid uniformity through rotation, while the downstream stationary pipe is fixed to fit the downstream equipment. The transition from dynamic to static is achieved through the sealing effect of a sealing gasket. This solves the problems of difficulty in adapting fully rotating pipes to downstream fixed equipment and the tendency for liquid sedimentation in fully static pipes in existing technologies. It is particularly suitable for scenarios such as low-temperature deposition printing, which have stringent requirements for the uniformity and sealing of high-viscosity liquids. It can ensure material uniformity, avoid material waste and equipment contamination caused by leakage, and simplify the sealing structure at the dynamic-static transition, thereby improving the reliability and ease of maintenance of the equipment.

[0009] According to a preferred embodiment, a rotating pipe bearing is disposed within the inner cavity of the rotating pipe flange. The rotating pipe bearing has an inner ring and an outer ring that can rotate relative to each other. The rotating pipe bearing is sleeved on the outside of the rotating pipe, and its inner ring mates with the outer wall of the rotating pipe, allowing the inner ring to rotate synchronously with the rotating pipe. This design effectively constrains the radial offset and axial movement of the rotating pipe during rotation, ensuring that the rotating pipe always maintains stable rotation around its own axis. This fully leverages the role of the rotating pipe in suppressing the sedimentation of high-viscosity liquid particles and preventing component stratification through rotation. Furthermore, the relative rotation of the inner and outer rings of the bearing allows for flexible adaptation to the dynamic rotation requirements of the rotating pipe. It does not hinder the normal rotation of the rotating pipe, but rather restricts the rotation of the rotating pipe within a preset axial range through the bearing structure, providing a stable structural foundation for subsequent coaxial connection between the rotating pipe and a stationary pipe to construct a continuous flow channel.

[0010] According to a preferred embodiment, the outer ring of the rotating pipe bearing is connected to the inner wall of the rotating pipe flange sleeve to prevent the rotation of the rotating pipe from being transmitted to the rotating pipe flange sleeve. This connection effectively blocks the transmission of rotation from the rotating pipe to the rotating pipe flange sleeve, keeping the flange sleeve stationary. This lays the foundation for a stable coaxial connection between the rotating and stationary flange sleeves, ensuring structural stability after connection and thus guaranteeing the continuity of the flow channel formed by the rotating and stationary pipes. It also prevents the flange sleeve from disrupting the connection due to rotation with the rotating pipe, thus affecting the normal transport function of the flow channel.

[0011] According to a preferred embodiment, a limiting ring is welded or integrally formed on the outer wall of the upstream end of the stationary pipe. The downstream end of the rotating pipe can be inserted into the inner cavity of this limiting ring to achieve coaxial connection with the stationary pipe. The limiting ring, either welded or integrally formed on the outer wall of the upstream end of the stationary pipe, and the insertion of the downstream end of the rotating pipe into the inner cavity of this limiting ring, precisely constrains the relative positions of the two pipes, effectively ensuring the coaxiality of the rotating and stationary pipes and guaranteeing stable connection to form a continuous flow channel, preventing liquid transport from being affected by connection misalignment. Simultaneously, the welded or integrally formed limiting ring structure is robust and can maintain connection accuracy over a long period, providing a reliable structural foundation for sealing at the rotation-stationary transition and stable liquid transport.

[0012] According to a preferred embodiment, a spring is provided inside the flange sleeve of the stationary pipe. The spring is sleeved on the outside of the stationary pipe, with one end abutting against the inner wall of the downstream end of the flange sleeve and the other end abutting against the annular platform formed by the upper limit ring of the stationary pipe. This allows the spring to provide a continuous axial preload, pushing the stationary pipe closer to the rotating pipe, thereby compressing the sealing gasket sandwiched between the two pipe end faces. The spring inside the flange sleeve, sleeved on the outside of the stationary pipe, with its two ends abutting against the downstream inner wall of the flange sleeve and the annular platform of the stationary pipe's limit ring, provides a continuous axial preload to push the stationary pipe closer to the rotating pipe, ensuring that the sealing gasket between the two pipe end faces is always compressed, effectively blocking the liquid leakage path. Simultaneously, the continuous preload can compensate for the wear of the sealing gasket during use, maintaining long-term sealing reliability and ensuring stable liquid transport in the flow channel formed by the two pipes.

[0013] According to a preferred embodiment, the sealing gasket is configured as an annular structure. The sealing gasket is fixedly connected to the inner cavity of the limiting ring of the stationary pipe. When the rotating pipe rotates around its own axis, its downstream end face forms a sliding contact with the sealing gasket. The sealing gasket is configured as an annular structure to fit the pipe flow channel, reserving a channel for internal liquid transportation and avoiding obstruction of fluid flow. Its fixed connection with the inner cavity of the limiting ring of the stationary pipe can stably maintain the sealing position, ensuring that the sealing effect is accurately applied at the joint of the two pipes. When the rotating pipe rotates around its own axis, its downstream end face forms a sliding contact with the sealing gasket, which does not affect the normal rotation of the rotating pipe, and can effectively prevent liquid leakage by continuously sealing the gap between the two pipes, ensuring the reliability of the flow channel seal.

[0014] According to a preferred embodiment, an injector is disposed on the upstream side of the rotating pipe. The downstream outlet of the injector is connected to the upstream port of the rotating pipe via a hose to form a continuous flow channel, thereby enabling the injector to controllably push liquid into the rotating pipe. The hose connection between the injector's outlet and the upstream port of the rotating pipe allows for flexible adaptation to their relative positions, avoiding installation limitations caused by rigid connections. The injector can controllably push liquid into the rotating pipe, stably controlling the liquid delivery volume and speed, and preventing delivery fluctuations from affecting the stability of liquid flow within the flow channel. Simultaneously, the injector continuously provides the delivery medium to the continuous flow channel formed by the rotating and stationary pipes, ensuring a stable material source within the flow channel and guaranteeing smooth liquid delivery within the rotating-stationary transition flow channel.

[0015] According to a preferred embodiment, the sealing device includes an extension shaft and an extension shaft sealing gasket. The extension shaft is located downstream of the stationary pipe, with one end coaxially connected to the downstream port of the stationary pipe, for extending the transport path of the flow channel or connecting other functional units. The extension shaft sealing gasket is annular and coaxially clamped between the connection end faces of the extension shaft and the stationary pipe, sealing the connection gap between the two and preventing liquid leakage. The extension shaft's location downstream of the stationary pipe and coaxial connection to the downstream port of the stationary pipe ensures the continuity of the flow channel, avoiding discontinuity in the flow channel connection due to path extension. It also allows for extending the transport path as needed to adapt to different usage scenarios and can connect other functional units to improve the device's applicability. The annular extension shaft sealing gasket, coaxially clamped between the connection end faces, fully covers the connection gap, effectively preventing liquid leakage from the connection point, ensuring a complete seal of the flow channel, and providing a guarantee for stable liquid transport within the extended flow channel.

[0016] According to a preferred embodiment, the sealing device includes a three-way valve and a three-way valve sealing gasket. The three-way valve is located downstream of the extension shaft, with its inlet coaxially connected to the other end of the extension shaft, and its outlet guiding the liquid in the flow channel to different branch flow paths. The three-way valve sealing gasket is annular and coaxially clamped between the inlet end of the three-way valve and the connecting end face of the extension shaft, sealing the connection gap between the two during flow path switching to prevent liquid backflow or sudden pressure drop. The three-way valve, located downstream of the extension shaft, with its inlet coaxially connected to the other end of the extension shaft, ensures the continuity of flow channel transportation and guides the liquid to different branch flow paths through its outlet, enabling flexible flow path switching to adapt to diverse transportation needs. The annular three-way valve sealing gasket, coaxially clamped between the connecting end faces, can tightly seal the connection gap during flow path switching, effectively preventing liquid backflow and sudden pressure drop in the flow channel, ensuring stable liquid transportation, reliable sealing during switching, and not affecting the overall transportation effect.

[0017] According to a preferred embodiment, a pipe retainer is provided at the upstream end of the rotary pipe flange sleeve. The pipe retainer is configured as a block or cylindrical structure, with several bolt holes on its top or side for connection to the rotary pipe via bolts. The pipe retainer at the upstream end of the rotary pipe flange sleeve, based on a block or cylindrical structure, connects to the rotary pipe via bolts through the bolt holes on its top or side, providing a stable assembly positioning reference for the rotary pipe and effectively constraining its installation position. Furthermore, the tightness of the bolted connection combined with the stability of the retainer's own structure reduces positional displacement of the rotary pipe during rotation, ensuring its smooth rotation and providing reliable support for the fit between the rotary pipe and related components and the stable construction of the flow channel. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a preferred sealing device provided by this utility model; Figure 2 This is a schematic diagram of the disassembly structure of a preferred sealing device provided by this utility model; Figure 3 This is a perspective view of the internal structure of a preferred sealing device provided by this utility model; Figure 4 This is a partial structural magnified perspective view of a preferred sealing device provided by this utility model.

[0019] List of reference numerals 1: Syringe; 2: Pipe retainer; 3: Rotating pipe bearing; 4: Rotating pipe; 5: Rotating pipe flange sleeve; 6: O-ring; 7: Sealing gasket; 8: Stationary pipe; 8.1: First inner wall; 8.2: Second inner wall; 9: Spring; 10: Stationary pipe flange sleeve; 11: Extension shaft sealing gasket; 12: Extension shaft; 13: Three-way valve sealing gasket; 14: Three-way valve. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings.

[0021] Directional definition: See Figure 1 Along the central axis of the entire device, with the end where the syringe 1 is located as the upstream end and the end where the three-way valve 14 is located as the downstream end.

[0022] This embodiment relates to a rotary-stationary transition channel sealing device, which, through a combined design of rotatable and stationary pipes, enables both the suppression of high-viscosity liquid sedimentation by utilizing pipe rotation and the smooth transition and transport of high-viscosity liquids within the same flow channel, combined with a dedicated sealing structure. See also Figure 1 and Figure 2 The sealing device comprises a rotating pipe 4 capable of rotating around its own axis and a stationary pipe 8 that remains stationary. The rotating pipe 4 is a cylindrical tubular structure that can rotate around its own axis under the drive of an external device, thereby suppressing the sedimentation and stratification of high-viscosity liquids within the pipe. This is particularly suitable for the delivery needs of media such as bio-inks and bone tissue repair composites in low-temperature deposition printing scenarios, preventing nozzle clogging or decreased printing accuracy caused by particle settling due to prolonged static placement. The stationary pipe 8, which works in conjunction with the rotating pipe 4, is also a cylindrical tubular structure. Its first inner wall 8.1 maintains the same diameter and smoothness as the inner wall of the rotating pipe 4, ensuring no abrupt flow changes when liquid enters the stationary pipe 8 from the rotating pipe 4. The stationary design of the stationary pipe 8 is to accommodate the installation requirements of downstream fixed equipment, ensuring stable downstream delivery by leveraging its stationary characteristic after the upstream rotating anti-sedimentation design.

[0023] Preferably, such as Figure 3 As shown, to achieve coaxial positioning and sealed connection of the two pipes, a rotating pipe flange sleeve 5 is installed on the outside of the rotating pipe 4. Combined with... Figure 2 The rotating pipe flange 5 is an annular sleeve structure, fitted onto the outside of the rotating pipe 4 and close to its downstream end. The flange on the downstream side of the rotating pipe flange 5 has a positioning structure such as an annular boss or locating pin holes, used for alignment and connection with the stationary pipe flange 10 installed on the outside of the stationary pipe 8. The stationary pipe flange 10 is also an annular sleeve structure, fitted onto the outside of the stationary pipe 8 and close to its upstream end. Its upstream flange has a locating groove, pin holes, and other structures adapted to the flange of the rotating pipe flange 5. Through the cooperation of these locating structures, the two flanges can achieve coaxial connection, thereby enabling the rotating pipe 4 and the stationary pipe 8 located inside them to form a continuous flow channel.

[0024] Preferably, see Figure 2 and Figure 4 A limiting ring is welded or integrally formed on the outer wall of the upstream end of the stationary pipe 8. The downstream end of the rotating pipe 4 can be inserted into the inner cavity of this limiting ring to achieve coaxial connection with the stationary pipe 8. Due to the presence of the limiting ring, the inner wall diameter of the stationary pipe 8 has two specifications: the first inner wall 8.1 is used to provide a flow path for high-viscosity liquids, and its diameter is preferably the same as the inner wall diameter (inner diameter) of the rotating pipe 4, thereby avoiding the impact of sudden changes in pipe diameter on the smoothness of liquid flow; the second inner wall 8.2 is used to ensure coaxial connection with the rotating pipe 4, and its diameter is preferably the same as the outer wall diameter (outer diameter) of the rotating pipe 4. This design reduces the gap after the stationary pipe 8 and the rotating pipe 4 are connected, reducing the risk of liquid leakage.

[0025] Preferably, such as Figure 3 As shown, a sealing gasket 7 is disposed in the internal cavity formed by the rotating pipe flange 5 and the stationary pipe flange 10 after the alignment connection is completed. This sealing gasket 7 is preferably a ring-shaped thin sheet structure made of polytetrafluoroethylene (PTFE), which has the characteristics of low friction coefficient, high temperature resistance, and excellent chemical corrosion resistance. More preferably, the sealing gasket 7 is disposed in the inner cavity of the limiting ring of the stationary pipe 8, and the outer diameter of its annular structure is the same as the diameter of the second inner wall 8.2 of the stationary pipe 8, while the inner diameter is the same as the diameter of the first inner wall 8.1. This sealing gasket 7 can cover the downstream end face of the rotating pipe 4, which can both prevent rigid contact between the rotating pipe 4 and the stationary pipe 8 due to the clamping force of the two flanges disposed on their outer sides, and provide a channel for the flow of high-viscosity liquids in the pipe due to its hollow annular structure.

[0026] Preferably, to ensure a good seal, the thickness of the sealing gasket 7 is set to be greater than the distance between the downstream end face of the rotating pipe 4 and the upstream end face of the stationary pipe 8. When the two flanges are coaxially aligned and clamped, the sealing gasket 7 deforms under the clamping force, fully filling the assembly gap between the two pipe end faces, including minor gaps caused by machining errors and misalignment, thereby effectively blocking the liquid leakage path. More preferably, the sealing gasket 7 also has a lubrication function. The sealing gasket 7 is fixedly connected to the inner cavity of the limiting ring of the stationary pipe 8. When the rotating pipe 4 rotates around its own axis under the drive of an external drive device, its downstream end face and the sealing gasket 7 are in sliding contact. This design prevents the rotating pipe 4 from transmitting rotation to the stationary pipe 8, ensuring the overall stability of the device during dynamic operation.

[0027] Preferably, see Figure 2 and Figure 4 An O-ring 6 is fitted onto the outer wall of the rotating pipe 4 near its downstream end. This O-ring 6, preferably located within the inner cavity of the limiting ring of the stationary pipe 8, is made of elastic material and is used to seal any minute radial gaps that may exist between the outer wall of the rotating pipe 4 and the inner wall of the limiting ring of the stationary pipe 8. The O-ring 6 can mate with the sealing gasket 7 to form a double seal at both the side wall and the downstream end face of the rotating pipe 4, thereby further enhancing the overall sealing performance of the device and effectively preventing internal liquid leakage.

[0028] Preferably, such as Figures 2-4 As shown, a rotary pipe bearing 3 is disposed within the inner cavity of the rotary pipe flange sleeve 5. This rotary pipe bearing 3 has an overall annular structure, with an inner ring and an outer ring that can rotate relative to each other. Both the inner and outer rings are metal rings, and their inner and outer walls are polished to help reduce rolling friction resistance. The rotary pipe bearing 3 is fitted onto the outside of the rotary pipe 4. Its inner ring mates with the outer wall of the rotary pipe 4, allowing the inner ring to rotate synchronously with the rotary pipe 4 without relative sliding. The outer ring is fixedly connected to the inner wall of the rotary pipe flange sleeve 5, which not only determines the installation position of the rotary pipe bearing 3 but also prevents the rotation of the rotary pipe 4 from being transmitted to the rotary pipe flange sleeve 5, thereby ensuring that the flange sleeve remains stationary. This rotary pipe bearing 3 supports the rotary pipe 4, enabling it to rotate stably around its own axis and suppressing radial offset and axial movement. Furthermore, through precise assembly, the rotary pipe bearing 3 can further maintain the coaxiality between the rotary pipe 4 and the stationary pipe 8, ensuring a continuous and stable fluid channel between them.

[0029] Preferably, such as Figure 2 , Figure 3As shown, a pipe fastener 2 is provided at the upstream end of the rotating pipe flange sleeve 5. The pipe fastener 2 can be designed as a block or cylindrical structure, with several bolt holes on its top or side, which are fixedly connected to the rotating pipe 4 by bolts, thereby providing an assembly reference and positioning for the rotating pipe 4 and the stationary pipe 8, ensuring that the two pipes are aligned on the same axis.

[0030] Preferably, such as Figures 2-4 As shown, to ensure that the sealing gasket 7 always maintains a tight fit with the two pipe end faces and maintains a stable sealing pressure, a spring 9 is provided inside the stationary pipe flange sleeve 10 of this sealing device. The spring 9 is sleeved on the outside of the stationary pipe 8, with one end abutting against the inner wall of the downstream end of the stationary pipe flange sleeve 10, and the other end abutting against the annular platform formed by the upper limit ring of the stationary pipe 8. The spring 9 provides a continuous axial preload, pushing the stationary pipe 8 (and its limit ring) closer to the rotating pipe 4, thereby compressing the sealing gasket 7 sandwiched between the two pipe end faces to achieve a tight seal. The elastic characteristics of the spring 9 also compensate for the wear that may occur to the sealing gasket 7 during use, preventing a decrease in sealing performance due to long-term rotational movement and effectively preventing leakage of liquid inside the pipe.

[0031] Preferably, such as Figure 2 , Figure 3 As shown, the sealing device uses syringe 1 to provide stable high-viscosity liquid delivery power to the flow channel. Syringe 1 includes a syringe barrel, a push rod, a piston, and a discharge port. Syringe 1 is located upstream of the rotating pipe 4, i.e., at the starting end of material delivery. Its discharge port is sealed and connected to the upstream end of the rotating pipe 4 (the end closest to syringe 1) via a flexible hose. The main function of syringe 1 is to provide high-viscosity liquid delivery power to the flow channel. By manually pushing or using a motor to drive its push rod to move at a uniform speed, the piston slides smoothly within the syringe barrel, pushing the liquid at a controllable flow rate into the hose and then into the rotating pipe 4.

[0032] Preferably, such as Figure 2 , Figure 3As shown, this sealing device ensures the sealing of the downstream connection of the stationary pipe 8 by setting an extension shaft 12 and an extension shaft sealing gasket 11. The extension shaft 12 is a cylindrical metal component. Its end near the stationary pipe 8 has a connecting structure for detachable fixation to the stationary pipe 8 or the stationary pipe flange sleeve 10. The end of the extension shaft 12 away from the stationary pipe 8 has a matching or compatible interface for connection to the downstream three-way valve 14. The extension shaft sealing gasket 11 is an annular structure with a diameter consistent with the diameter of the extension shaft 12 connecting structure and the downstream connection structure of the stationary pipe 8, ensuring that the continuity of the flow path is not affected after assembly. The extension shaft sealing gasket 11 is coaxially clamped between the connection end faces of the extension shaft 12 and the stationary pipe 8. When the extension shaft 12 and the stationary pipe 8 are fixed by threads or flanges, the connection end faces will compress the extension shaft sealing gasket 11, causing it to undergo elastic deformation, filling the tiny gaps at the connection end faces, and forming a reliable seal.

[0033] Preferably, such as Figure 2 , Figure 3 As shown, the three-way valve 14 can have a T-type or Y-type valve body structure, with one inlet end and multiple outlet ends. Both the inlet and outlet ends are tubular interfaces with connecting structures on the inner or outer walls. The inlet end is used to connect to the extension shaft 12, and the outlet ends can be connected to a delivery pipeline, a return pipeline, or a drain pipeline, respectively, to realize the functions of liquid delivery, return, or drain. The three-way valve 14 achieves a seal at its connection with the extension shaft 12 using a three-way valve sealing gasket 13. The diameter of the three-way valve sealing gasket 13 is consistent with the diameter of the inlet end interface of the three-way valve 14 and the interface of the extension shaft 12, ensuring that it does not affect the liquid flow. The three-way valve sealing gasket 13 is coaxially clamped between the inlet end of the three-way valve 14 and the connecting end face of the extension shaft 12. When the three-way valve 14 and the extension shaft 12 are fixed by threads or flanges, the connecting end face compresses the three-way valve sealing gasket 13, causing it to undergo elastic deformation and fill the gap to form a seal.

[0034] It should be noted that the above specific embodiments are exemplary. Those skilled in the art can devise various solutions inspired by the disclosure of this utility model, and these solutions all fall within the scope of this utility model and its protection scope. Those skilled in the art should understand that this utility model specification and its drawings are illustrative and do not constitute a limitation on the claims. The protection scope of this utility model is defined by the claims and their equivalents. Throughout the text, features introduced by "preferred" are merely optional and should not be construed as mandatory. Therefore, the applicant reserves the right to abandon or delete relevant preferred features at any time.

Claims

1. A sealing device for a rotation-stationary transition channel, comprising a rotating pipe (4) capable of rotating about its own axis and a stationary pipe (8) remaining stationary, characterized in that, A rotating pipe flange sleeve (5) is installed on the outside of the rotating pipe (4). The rotating pipe flange sleeve (5) is coaxially connected with the stationary pipe flange sleeve (10) installed on the outside of the stationary pipe (8), so that the rotating pipe (4) and the stationary pipe (8) form a continuous flow channel. A sealing gasket (7) is provided between the rotating pipe flange sleeve (5) and the stationary pipe flange sleeve (10). The sealing gasket (7) is configured to have a thickness at least greater than the distance between the downstream port of the rotating pipe (4) and the upstream port of the stationary pipe (8), so that the sealing gasket (7) can be clamped by the two pipes and seal the gap between the two ports, so that the flow channel formed by the two pipes can transfer the internal liquid in the form of the upstream section rotating and the downstream section stationary.

2. The sealing device according to claim 1, characterized in that, A rotary pipe bearing (3) is disposed in the inner cavity of the rotary pipe flange sleeve (5). The rotary pipe bearing (3) has an inner ring and an outer ring that can rotate relative to each other. The rotating pipe bearing (3) is sleeved on the outside of the rotating pipe (4), and its inner ring is fitted with the outer wall of the rotating pipe (4) so ​​that the inner ring can rotate synchronously with the rotating pipe (4).

3. The sealing device according to claim 2, characterized in that, The outer ring of the rotating pipe bearing (3) is connected to the inner wall of the rotating pipe flange sleeve (5) to prevent the rotation of the rotating pipe (4) from being transmitted to the rotating pipe flange sleeve (5).

4. The sealing device according to claim 3, characterized in that, The upper end of the stationary pipe (8) has a limit ring welded or integrally formed on the outer wall. The lower end of the rotating pipe (4) can be inserted into the inner cavity of the limit ring to achieve coaxial docking with the stationary pipe (8).

5. The sealing device according to claim 4, characterized in that, A spring (9) is provided in the inner cavity of the stationary pipe flange sleeve (10). The spring (9) is sleeved on the outside of the stationary pipe (8). One end of the spring (9) abuts against the inner wall of the downstream end of the stationary pipe flange sleeve (10), and the other end abuts against the annular platform formed by the upper limit ring of the stationary pipe (8). The spring (9) provides a continuous axial preload force, which pushes the stationary pipe (8) closer to the rotating pipe (4), thereby pressing the sealing gasket (7) clamped between the two pipe end faces.

6. The sealing device according to claim 4, characterized in that, The sealing gasket (7) is configured as an annular structure. The sealing gasket (7) is fixedly connected to the inner cavity of the limiting ring of the stationary pipe (8). When the rotating pipe (4) rotates around its own axis, its downstream end face forms a sliding contact with the sealing gasket (7).

7. The sealing device according to claim 1, characterized in that, An injector (1) is provided on the upstream side of the rotating pipe (4). The downstream outlet of the injector (1) is connected to the upstream port of the rotating pipe (4) through a hose to form a continuous flow channel, so that the injector (1) can push liquid into the rotating pipe (4).

8. The sealing device according to claim 1, characterized in that, The sealing device includes an extension shaft (12) and an extension shaft sealing gasket (11). The extension shaft (12) is located downstream of the stationary pipe (8), with one end coaxially connected to the downstream port of the stationary pipe (8), for extending the transport path of the flow channel or connecting other functional units. The extension shaft sealing gasket (11) is annular and coaxially clamped between the connection end face of the extension shaft (12) and the stationary pipe (8) to seal the connection gap between the two and prevent liquid leakage.

9. The sealing device according to claim 8, characterized in that, The sealing device includes a three-way valve (14) and a three-way valve sealing gasket (13). The three-way valve (14) is located downstream of the extension shaft (12), with its inlet coaxially connected to the other end of the extension shaft (12) and its outlet guiding the liquid in the flow channel to different branch flow paths; The sealing gasket (13) of the three-way valve is annular and coaxially clamped between the inlet end of the three-way valve (14) and the connecting end face of the extension shaft (12). It seals the connection gap between the two during the flow path switching process to prevent liquid backflow or sudden pressure drop.

10. The sealing device according to claim 1, characterized in that, The upstream end of the rotating pipe flange sleeve (5) is provided with a pipe fastener (2). The pipe fastener (2) is configured as a block or cylindrical structure, with several bolt holes on its top or side, and is connected to the rotating pipe (4) by bolts.

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