Water turbine floating sealing ring mounting structure, floating sealing assembly and water turbine
By installing a floating sealing ring structure with multiple layers of baffle ring grooves and a locking mechanism on the turbine support ring, the problem of poor sealing caused by dynamic changes in the turbine main shaft is solved, achieving reliable sealing effect and safety.
Patent Information
- Application Number
- CN202520734426.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-17
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-04-17
AI Technical Summary
Traditional conventional sealing structures cannot effectively adapt to the dynamic changes of the turbine main shaft, resulting in poor sealing performance and potential lubricating oil leakage, posing a risk of combustion.
The floating seal ring installation structure is adopted. Multiple baffles are set on the support ring to form a ring groove, and the floating seal ring is fixed by a locking mechanism. The floating seal ring is combined with different materials (such as nitrile rubber and polyurethane) to adapt to the floating condition of the spindle, providing multiple sealing points and oil storage function to reduce leakage.
It achieves a reliable sealing effect under the floating condition of the main shaft, reduces energy loss, avoids sealing ring detachment and leakage, and improves the operating stability and safety of the turbine.
Smart Images
Figure CN223794263U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of water turbine sealing technology, and in particular to a floating sealing ring installation structure, a floating sealing assembly, and a water turbine. Background Technology
[0002] Due to the unique operating conditions of the turbine main shaft, floating seal technology is required for sealing. During operation, the turbine starts and stops, load adjustments, uneven water flow distribution, cavitation, and water hammer impact cause unstable water flow to impact the runner, generating unstable axial and radial thrust on the main shaft. At the same time, bearing wear, assembly errors, and overall unit vibration can all cause axial and radial displacement of the main shaft, resulting in main shaft floating. Traditional conventional sealing structures cannot effectively and reliably adapt to such dynamic changes in the turbine main shaft. Therefore, floating seal technology is widely used in turbine main shaft sealing.
[0003] The principle of floating seals is to use the floating sealing ring to control the width of the leakage gap through dynamic deformation under its own / other elastic elements, thereby maintaining the sealing surface in a designed tight fit. Depending on the location of use, it is used to prevent water or oil leakage or media intrusion, so as to enable the turbine to operate efficiently and stably.
[0004] In the prior art, regarding the implementation of the floating seal assembly for a water turbine, such as a floating seal assembly located at the bearing housing position, a relatively simple implementation method is to use the bearing housing cover plate as a support ring for installing the floating seal ring, wherein the floating seal ring is located inside the support ring and extends into the shaft hole of the support ring.
[0005] Compared to mechanical seals, the application of floating seal technology in water turbines not only offers an ideal lifespan and effectively reduces resistance to the rotation of the main shaft, but also allows for maintenance during turbine operation through specific structural designs. Therefore, further optimization of floating seal technology for water turbines is of great significance to the application and technological development of water turbines. Utility Model Content
[0006] To address the aforementioned issues regarding the optimization of floating seal technology for water turbines, this utility model provides a floating seal ring installation structure, a floating seal assembly, and a water turbine. This technical solution not only simplifies the installation of the floating seal ring on the support ring and facilitates the configuration of the floating seal ring on the support ring, but also features reliable fixation of the floating seal ring.
[0007] To address the aforementioned problems, the floating sealing ring installation structure, floating sealing assembly, and turbine provided by this utility model solve the problems through the following technical points: The floating sealing ring installation structure for the turbine includes a support ring, and an installation seat for installing the floating sealing ring is provided on the inner side of the support ring. The installation seat is a circular ring structure coaxial with the support ring. Multiple baffles are provided on the inner wall of the installation seat. The baffles are arranged at intervals along the axial direction of the installation seat, and the baffles form multiple annular grooves arranged along the axial direction of the installation seat. The number of annular grooves is greater than or equal to 3, and each annular groove has an opening facing the center of the installation seat.
[0008] Each annular groove located at the end of the mounting base is equipped with a locking mechanism, which is used to lock the floating sealing ring in the annular groove at the end of the mounting base.
[0009] In existing technologies, the main shaft of a water turbine is usually supported by bearings. At the same time, the operating conditions of the water turbine determine that the main shaft has a floating motion characteristic during the operation of the water turbine. The electrical structure around the bearing housing at the lower end of the main shaft usually includes temperature sensors, vibration induction coils, grounding carbon brushes, conductive rings, excitation coils, etc. If there is a leak of lubricating oil in the bearing housing, the lubricating oil may burn due to the heating of the relevant electrical structure. Therefore, higher requirements are placed on the floating sealing components used to achieve the sealing of the lubricating oil in the bearing housing.
[0010] In this solution, the support ring serves as the basic ring structure of the floating seal ring. Specifically, it can be used as the stationary ring of the floating seal ring and as the floating seal ring mounting structure on the floating seal assembly. The floating seal ring is installed through the annular groove formed between the multiple baffles on the inner side of the mounting base. Specifically, the floating seal ring is clamped in the annular groove, and the root (outer ring) of the floating seal ring is fixed to the mounting base by a locking mechanism. One possible approach is to install floating seal rings in both ends of the multiple annular grooves. Specifically, a nitrile rubber ring is used as the floating seal ring at the end closest to the bearing (upper end) to maintain long-term reliability due to its oil resistance, while a polyurethane ring is used at the other end (lower end) to adapt to the dynamic sealing requirements under the floating conditions of the spindle. The annular groove between the two ends of the multiple annular grooves serves as an oil reservoir.
[0011] The above-described mounting base structure provides a foundation for the floating sealing ring. When used for vertical mounting of the support ring axis and as a lower cover plate for the bearing housing, for potential oil leakage to the underside of the support ring, two or more axial sealing points can be formed through the ring grooves. Utilizing the throttling effect of each floating sealing ring, the pressure difference across a single floating sealing ring can be small. Therefore, this solution provides a technical solution that achieves a sealing effect while minimizing spindle energy loss. Simultaneously, fixing the floating sealing rings with spaced-apart ring grooves avoids interference when the spindle is floating, ensuring that each floating sealing ring provides a reliable floating sealing effect.
[0012] The above-described mounting structure provides an oil storage structure basis for the floating seal ring. For the medium (bearing oil) that passes through the upper floating seal ring and leaks into the ring groove between the two end ring grooves, the oil storage function provided by the ring groove between the two end ring grooves can be used to temporarily store the medium. Later, the medium at this position can be discharged at a fixed point through the oil outlet hole set on the support ring, reducing the possibility that the medium will eventually leak downward from the lower floating seal ring.
[0013] Using the aforementioned annular groove as the fixing base for the outer ring of the floating sealing ring, the floating sealing ring is conveniently installed on the support ring. At the same time, for the floating working condition of the main shaft, with the assistance of the locking mechanism, the floating sealing ring can be effectively prevented from flipping out of the annular groove due to the force of the main shaft, thus making this solution have the characteristic of reliable fixing of the floating sealing ring.
[0014] As a further technical solution to the aforementioned floating sealing ring mounting structure for the water turbine:
[0015] The number of annular grooves is 3. Along the axis of the mounting base, the three annular grooves are the first groove, the second groove, and the third groove.
[0016] It also includes an oil outlet hole provided on the support ring, with one end of the oil outlet hole located on the outer wall of the support ring and the other end located on the bottom of the second groove.
[0017] The above provides a specific annular groove configuration, which can be as follows: three annular grooves are formed by four baffles spaced apart on the axis of the mounting base, i.e., an annular groove is formed between each pair of adjacent baffles. The first groove and the third groove serve as annular grooves for installing floating sealing rings. The second groove serves as a temporary storage groove for bearing oil. The oil outlet serves as a discharge hole for bearing oil in the second groove and as a pressure equalization hole between the second groove and the outside, so as to reduce the amount of bearing oil that may leak downward through the floating sealing ring in the third groove. In addition, pressure equalization is achieved by means of a breather valve (the breather valve is connected to the outside of the oil outlet through an oil discharge pipe), reducing the pressure difference between the two sides of the floating sealing ring in the third groove (during the operation of the spindle, the internal pressure of the second groove may increase due to poor friction and heating), so as to ensure the sealing effect of the floating sealing ring in the third groove.
[0018] The number of locking mechanisms is multiple, and the locking mechanisms are arranged at intervals along the circumferential direction of the mounting base;
[0019] The locking mechanism includes a locking pin and a pin cap. Each locking mechanism is provided with a pin hole on the baffle. The locking pin of each locking mechanism passes through the pin hole and through the annular groove at the end of the mounting base. The pin cap is used to connect to the end of the locking pin to limit the locking pin in the axial direction of the mounting base.
[0020] The above provides a specific implementation of the locking mechanism, where multiple locking mechanisms result in multiple locking points in the circumferential direction of the floating sealing ring. In this implementation, the locking pin is installed on the baffle using the pin hole, and a pin cap is used to achieve mutual locking between the locking pin and the baffle. Specifically, one end of the locking pin may have an end cap. After the locking pin passes through the pin hole and through the baffle, and the end cap is supported on the corresponding baffle, a pin cap is installed on the other end of the locking pin. The connection between the pin cap and the locking pin can be a threaded connection with thread-locking adhesive, a threaded connection followed by spot welding to prevent loosening, or the locking pin being embedded in the center hole of the pin cap and then welded together. Ultimately, the pin cap and end cap are used to limit the locking pin's position in the axial direction of the mounting base. The function of the end cap can also be replaced by another pin cap.
[0021] Regarding the floating sealing ring adapted to the above locking mechanism, each locking pin is matched with a through hole located on the floating sealing ring, through which the locking pin passes. The through hole can be a circular hole; preferably, to facilitate the installation of the floating sealing ring and improve the efficiency of the positional adaptation between the through hole and the locking pin, the through hole is an arc-shaped strip hole, with the center of the cylindrical strip hole located on the axis of the floating sealing ring.
[0022] The support ring is formed by two independent semi-rings, and the mounting base is formed by the inner side of the semi-rings. Each semi-ring has multiple layers of baffles on its inner side.
[0023] Each half-ring has a connecting plate at its end, and each connecting plate has bolt holes for splicing the half-rings.
[0024] The above describes a specific implementation of a support ring, aiming to achieve the following: utilizing a split structure where the support ring is a semi-ring, maintenance of the floating seal ring can be completed during continuous spindle operation. Specifically, for the support ring under operating conditions, the complete support ring is assembled using connecting plates at the ends of each semi-ring. The assembly method involves using connecting bolts that mate with the bolt holes to connect the ends of the semi-rings. When maintenance of the floating seal ring is required without stopping the machine, the connecting bolts are removed, and each semi-ring is detached from the side of the spindle.
[0025] Matching the above support ring structure, each floating sealing ring is also a semi-ring structure, that is, a half-ring of the floating sealing ring is installed on the half-ring of each support ring. Preferably, in order to avoid leakage at the joint of the half-ring of the floating sealing ring, at least one half-ring of the floating sealing ring should be set to be larger than half the circumference of the floating sealing ring, so that after the floating sealing rings are spliced, there is circumferential compressive force at the joint position.
[0026] The support ring is the lower cover plate of the bearing housing of the water turbine.
[0027] The above describes the specific application of the support ring as the lower cover plate of the bearing housing. In this application, the support ring has a bowl-shaped structure with a shaft hole at one end. The mounting base is located inside the end of the support ring, and a connecting flange is provided at the other end of the support ring for connecting the support ring to the bearing housing.
[0028] This solution also relates to a floating seal assembly for a water turbine, including a stationary ring and a floating seal ring mounted on the stationary ring, wherein the stationary ring is the floating seal ring mounting structure for a water turbine as described in any of the above embodiments.
[0029] Each annular groove located at the end of the mounting base is equipped with a floating sealing ring. The outer side of the floating sealing ring is clamped between the baffles on both sides of the annular groove, and the floating sealing ring is locked in the annular groove by the locking mechanism.
[0030] The above describes the floating seal assembly, including the floating seal ring mounting structure, and illustrates the specific application of this floating seal ring mounting structure as the stationary ring of the turbine floating seal assembly.
[0031] As a further technical solution for the aforementioned floating seal assembly of the water turbine:
[0032] The floating sealing ring comprises two or more ring segments, and the floating sealing ring is a ring structure formed by splicing the end segments together.
[0033] The above solution is a specific application for maintaining the floating seal ring under the operating conditions of the turbine main shaft.
[0034] The floating sealing ring at one end of the mounting base is a nitrile rubber sealing ring, and the floating sealing ring at the other end is a polyurethane sealing ring.
[0035] The above solution is as follows: the floating sealing ring on the mounting base is a nitrile rubber sealing ring, with one end being the end closest to the spindle bearing housing (upper end), and the floating sealing ring on the mounting base is a polyurethane sealing ring, with one end being the end furthest from the spindle bearing housing (lower end). This solution utilizes different floating sealing rings to address the oil resistance issue and the leakage prevention issue under the floating spindle operating condition.
[0036] It also includes a breather valve, which is used to equalize the pressure between the annular groove between the floating sealing rings and the external environment of the support ring.
[0037] The above solution involves using the breather valve to equalize the pressure between the space between the floating sealing rings at both ends of the mounting base and the external environment of the support ring, thus preventing sealing failure due to excessive internal pressure in the space between the floating sealing rings after the temperature becomes too high. In specific implementation, the breather valve is connected to the response ring groove through the above-mentioned oil outlet.
[0038] This solution also relates to a water turbine, including a main shaft and a floating seal assembly that cooperates with the main shaft, wherein the floating seal assembly is the water turbine floating seal assembly described in any of the above embodiments.
[0039] The above-described turbine is a specific application of the floating seal assembly, and is a turbine that includes the floating seal assembly.
[0040] This utility model has the following beneficial effects:
[0041] This solution provides a technical approach that achieves a good sealing effect while minimizing spindle energy loss; at the same time, it avoids interference between the floating sealing rings and the floating spindle, ensuring that each floating sealing ring can provide a reliable floating seal.
[0042] This solution utilizes the oil storage function provided by the annular groove between the two ends to temporarily store the medium. Later, the medium at this location can be discharged at a fixed point through the oil outlet hole set on the support ring, reducing the possibility of the medium leaking downward from the lower floating sealing ring.
[0043] This solution uses the aforementioned annular groove as the fixing base for the outer ring of the floating sealing ring. The floating sealing ring is easy to install on the support ring. At the same time, for the floating working condition of the main shaft, with the assistance of the locking mechanism, the floating sealing ring can be effectively prevented from flipping out of the annular groove due to the force of the main shaft, thus making this solution reliable in fixing the floating sealing ring. Attached Figure Description
[0044] Fig. 1This is a top view of a specific embodiment of the floating seal assembly for a water turbine described in this solution;
[0045] Fig. 2 This is a top view of a specific embodiment of the floating sealing ring for a water turbine described in this solution;
[0046] Fig. 3 This is a schematic diagram of the structure at the end of the semi-ring in a specific embodiment of the turbine floating sealing ring installation structure described in this solution;
[0047] Fig. 4 This is a cross-sectional view of a specific embodiment of the floating sealing ring for a water turbine described in this solution.
[0048] The reference numerals in the attached drawings are as follows: 1. Support ring, 2. Mounting base, 3. Floating sealing ring, 4. Locking mechanism, 5. Locking pin, 6. Pin hole, 7. Baffle, 8. Ring groove, 9. Pin cap, 10. Through hole, 11. Bolt hole, 12. Connecting plate, 13. Oil outlet hole. Detailed Implementation
[0049] The present invention will be further described in detail below with reference to the embodiments, but the present invention is not limited to the following embodiments:
[0050] Example 1:
[0051] like Figs. 1 to 4 As shown, the turbine floating sealing ring mounting structure includes a support ring 1. The inner side of the support ring 1 is provided with a mounting seat 2 for mounting the floating sealing ring 3. The mounting seat 2 is a circular ring structure coaxial with the support ring 1. Multiple baffles 7 are provided on the inner wall of the mounting seat 2. The baffles 7 are arranged at intervals along the axial direction of the mounting seat 2, and the baffles 7 form multiple annular grooves 8 arranged along the axial direction of the mounting seat 2. The number of annular grooves 8 is greater than or equal to 3, and each annular groove 8 has a slot facing the center of the mounting seat 2.
[0052] Each annular groove 8 located at the end of the mounting base 2 is equipped with a locking mechanism 4, which is used to lock the floating sealing ring 3 in the annular groove 8 at the end of the mounting base 2.
[0053] In existing technologies, the main shaft of a water turbine is usually supported by bearings. At the same time, the operating conditions of the water turbine determine that the main shaft has a floating motion characteristic during the operation of the water turbine. The electrical structure around the bearing housing at the lower end of the main shaft usually includes temperature sensors, vibration induction coils, grounding carbon brushes, conductive rings, excitation coils, etc. If there is a leak of lubricating oil in the bearing housing, the lubricating oil may burn due to the heating of the relevant electrical structure. Therefore, higher requirements are placed on the floating sealing components used to achieve the sealing of the lubricating oil in the bearing housing.
[0054] In this solution, the support ring 1 serves as the basic ring structure of the floating sealing ring 3. Specifically, it can be used as the stationary ring of the floating sealing ring 3 and as the mounting structure for the floating sealing ring 3 on the floating sealing assembly. The floating sealing ring 3 is installed through the annular groove 8 formed between the multiple baffles 7 on the inner side of the mounting base 2. Specifically, the floating sealing ring 3 is clamped in the annular groove 8, and the root (outer ring) of the floating sealing ring 3 is fixed to the mounting base 2 by the locking mechanism 4. One possible approach is to install the floating sealing ring 3 in both ends of the multiple annular grooves 8. Specifically, a nitrile rubber ring is used as the floating sealing ring 3 at the end closest to the bearing (upper end) to maintain long-term reliability due to its oil resistance, while a polyurethane ring is used as the floating sealing ring 3 at the other end (lower end) to adapt to the dynamic sealing requirements under the floating conditions of the spindle. The annular groove 8 between the two ends of the multiple annular grooves 8 serves as an oil storage chamber.
[0055] The above-described mounting base 2 provides a mounting foundation for the floating sealing ring 3. When used for vertical mounting of the support ring 1 along its axis and as the lower cover plate of the bearing housing, for potential oil leakage to the underside of the support ring 1, two or more axial sealing points can be formed through the ring groove 8. Utilizing the throttling effect of each floating sealing ring 3, the pressure difference across a single floating sealing ring 3 can be small. Therefore, this solution provides a technical solution that achieves a sealing effect while minimizing spindle energy loss. Simultaneously, by fixing the floating sealing ring 3 with the spaced ring grooves 8, interference between the floating sealing ring 3 and the floating spindle can be avoided, ensuring that each floating sealing ring 3 can achieve a reliable floating sealing effect.
[0056] The above-described mounting base 2 structure provides an oil storage structure foundation for the floating sealing ring 3. For the medium (bearing oil) that passes through the upper floating sealing ring 3 and leaks into the annular groove 8 between the two annular grooves 8, the oil storage function provided by the annular groove 8 between the two annular grooves 8 can be used to temporarily store the medium. Later, the medium at this position can be discharged at a fixed point through the oil outlet hole 13 set on the support ring 1, reducing the possibility that the medium will eventually leak downward from the lower floating sealing ring 3.
[0057] Using the annular groove 8 as the fixing base for the outer ring of the floating sealing ring 3, the floating sealing ring 3 is easy to install on the support ring 1. At the same time, for the floating working condition of the main shaft, with the assistance of the locking mechanism 4, the floating sealing ring 3 can be effectively prevented from flipping out of the annular groove 8 due to the force of the main shaft, so that this solution has the characteristic of reliable fixing of the floating sealing ring 3.
[0058] Example 2:
[0059] This embodiment is a further refinement of embodiment 1:
[0060] The number of annular grooves 8 is 3. Along the axis of the mounting base 2, the three annular grooves 8 are the first groove, the second groove, and the third groove, respectively.
[0061] It also includes an oil outlet hole 13 provided on the support ring 1, with one end of the oil outlet hole 13 located on the outer wall of the support ring 1 and the other end located on the bottom of the second groove.
[0062] The above provides a specific configuration of the annular groove 8, which can be as follows: three annular grooves 8 are formed by four baffles 7 arranged at intervals on the axis of the mounting base 2, that is, an annular groove 8 is formed between each pair of adjacent baffles 7. The first groove and the third groove serve as annular grooves 8 for installing the floating sealing ring 3. The second groove serves as a temporary storage groove for bearing oil. The oil outlet 13 serves as a discharge hole for bearing oil in the second groove and as a pressure equalization hole between the second groove and the outside, so as to reduce the amount of bearing oil that may leak downward through the floating sealing ring 3 in the third groove. In addition, pressure equalization is achieved by means of a breather valve (the breather valve is connected to the outside of the oil outlet 13 through an oil discharge pipe), thereby reducing the pressure difference between the two sides of the floating sealing ring 3 in the third groove (during the operation of the spindle, the internal pressure of the second groove may increase due to poor friction and heating), so as to ensure the sealing effect of the floating sealing ring 3 in the third groove.
[0063] Example 3:
[0064] This embodiment is a further refinement of embodiment 1:
[0065] The number of locking mechanisms 4 is multiple, and the locking mechanisms 4 are arranged at intervals along the circumferential direction of the mounting base 2;
[0066] The locking mechanism 4 includes a locking pin 5 and a pin cap 9. Each locking mechanism 4 is provided with a pin hole 6 on the baffle 7. The locking pin 5 of each locking mechanism 4 passes through the pin hole 6 and passes through the annular groove 8 at the end of the mounting base 2. The pin cap 9 is used to connect to the end of the locking pin 5 to realize the limiting of the locking pin 5 in the axial direction of the mounting base 2.
[0067] The above provides a specific implementation of the locking mechanism 4, wherein the multiple locking mechanisms 4 are such that the floating sealing ring 3 has multiple locking points in the circumferential direction. In the implementation of the locking mechanism 4, the locking pin 5 is installed on the baffle 7 using the pin hole 6, and the locking pin 5 and the baffle 7 are locked together using the pin cap 9. Specifically, one end of the locking pin 5 can have an end cap. After the locking pin 5 passes through the pin hole 6 and through the baffle 7 and the end cap is supported on the corresponding baffle 7, the pin cap 9 is installed on the other end of the locking pin 5. The connection between the pin cap 9 and the locking pin 5 can be a threaded connection with thread-locking adhesive, or a threaded connection followed by spot welding to prevent loosening, or the locking pin 5 can be embedded in the center hole of the pin cap 9 and then welded together. Finally, the pin cap 9 and the end cap are used to limit the locking pin 5 in the axial direction of the mounting base 2. The function of the end cap can also be replaced by another pin cap 9.
[0068] Regarding the floating sealing ring 3 adapted to the locking mechanism 4 described above, each locking pin 5 is matched with a through hole 10 located on the floating sealing ring 3, through which the locking pin 5 passes. The through hole 10 can be a round hole. Preferably, to facilitate the installation of the floating sealing ring 3 and improve the positional adaptation efficiency between the through hole 10 and the locking pin 5, the through hole 10 is an arc-shaped strip hole, with the center of the cylindrical strip hole located on the axis of the floating sealing ring 3.
[0069] Example 4:
[0070] This embodiment is a further refinement of embodiment 1:
[0071] The support ring 1 is formed by two independent semi-rings, and the mounting base 2 is formed by the inner side of the semi-rings. Each semi-ring has multiple layers of baffles 7 on its inner side.
[0072] Each half-ring is provided with a connecting plate 12 at its end, and each connecting plate 12 is provided with bolt holes 11 for splicing the half-rings.
[0073] The above provides a specific implementation of the support ring 1, aiming to achieve the following: utilizing the split structure of the support ring 1 as a semi-ring, maintenance of the floating seal ring 3 can be completed during continuous operation of the spindle. Specifically, for the support ring 1 under working conditions, the connecting plates 12 at the ends of each semi-ring are used to complete the splicing of the complete support ring 1. The splicing method involves using connecting bolts adapted to the bolt holes 11 to connect the ends of the semi-rings. When maintenance of the floating seal ring 3 is required under non-stop conditions, the connecting bolts are removed, and each semi-ring is detached from the side of the spindle.
[0074] Matching the above-mentioned support ring 1 structure, each floating sealing ring 3 is also a semi-ring structure, that is, each half-ring of the floating sealing ring 3 is installed on the half-ring of the support ring 1. Preferably, in order to avoid leakage at the joint of the half-ring of the floating sealing ring 3, at least one half-ring of the floating sealing ring 3 should be set to be larger than half the circumference of the floating sealing ring 3, so that after the floating sealing ring 3 is spliced, there is circumferential extrusion force at the joint position.
[0075] Example 5:
[0076] This embodiment is a further refinement of embodiment 1:
[0077] The support ring 1 is the lower cover plate of the bearing seat of the water turbine.
[0078] The above describes the specific application of the support ring 1 as the lower cover plate of the bearing housing. In this application, the specific structure of the support ring 1 is a bowl-shaped structure with a shaft hole at the end. The mounting base 2 is located inside the end. A connecting flange for connecting the support ring 1 to the bearing housing is provided at the other end of the support ring 1.
[0079] Example 6:
[0080] Based on Embodiment 1, this embodiment provides a floating seal assembly for a water turbine, including a stationary ring and a floating seal ring 3 installed on the stationary ring. The stationary ring is the water turbine floating seal ring 3 installation structure described in Embodiment 1.
[0081] Each annular groove 8 located at the end of the mounting base 2 is equipped with a floating sealing ring 3. The outer side of the floating sealing ring 3 is clamped between the baffles 7 on both sides of the annular groove 8, and the floating sealing ring 3 is locked in the annular groove 8 by the locking mechanism 4.
[0082] The above describes the installation structure of the floating sealing ring 3, which is part of the floating sealing assembly, and illustrates the specific application of this installation structure as the stationary ring of the turbine floating sealing assembly.
[0083] Example 7:
[0084] This embodiment is a further refinement of embodiment 6:
[0085] The floating sealing ring 3 includes two or more ring segments, and the floating sealing ring 3 is a ring structure formed by splicing the end of the ring segments.
[0086] The above solution is a specific application for maintaining the floating seal ring 3 under the operating conditions of the turbine main shaft.
[0087] Example 8:
[0088] This embodiment is a further refinement of embodiment 6:
[0089] The floating sealing ring 3 at one end of the mounting base 2 is a nitrile rubber sealing ring, and the floating sealing ring 3 at the other end is a polyurethane sealing ring.
[0090] The above solution is as follows: the floating sealing ring 3 on the mounting base 2 is a nitrile rubber sealing ring with one end close to the spindle bearing housing (upper end), and the floating sealing ring 3 on the mounting base 2 is a polyurethane sealing ring with one end away from the spindle bearing housing (lower end). This solution utilizes different floating sealing rings 3 to solve the oil resistance problem and the leakage prevention problem under the floating spindle condition.
[0091] Example 9:
[0092] This embodiment is a further refinement of embodiment 6:
[0093] It also includes a breather valve, which is used to equalize the pressure between the annular groove 8 between the floating sealing rings 3 and the external environment of the support ring 1.
[0094] The above solution involves using the breather valve to equalize the pressure between the space between the floating sealing rings 3 at both ends of the mounting base 2 and the external environment of the support ring 1, so as to prevent the space between the floating sealing rings 3 from failing due to excessive internal pressure after the temperature becomes too high. In specific implementation, the breather valve is connected to the response ring groove 8 through the oil outlet 13.
[0095] Example 10:
[0096] This embodiment provides a water turbine based on embodiment 6, including a main shaft and a floating seal assembly that cooperates with the main shaft. The floating seal assembly is the water turbine floating seal assembly described in embodiment 6.
[0097] The above-described turbine is a specific application of the floating seal assembly, and is a turbine that includes the floating seal assembly.
[0098] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, other embodiments derived without departing from the technical solution of the present invention should be included within the protection scope of the present invention.
Claims
1. A structure for mounting a floating seal ring of a hydraulic turbine, comprising a support ring (1), the inner side of the support ring (1) being provided with a mounting seat (2) for mounting a floating seal ring (3), characterized in that, The mounting seat (2) is a coaxial ring structure with the support ring (1), and a plurality of baffles (7) are arranged on the inner wall of the mounting seat (2). The baffles (7) are arranged along the axis direction of the mounting seat (2) and form a plurality of ring grooves (8) arranged along the axis direction of the mounting seat (2). The number of the ring grooves (8) is greater than or equal to 3, and each ring groove (8) has a slot opening towards the center of the mounting seat (2); Each ring groove (8) at the end of the mounting seat (2) is provided with a locking mechanism (4) for locking the floating seal ring (3) in the ring groove (8) at the end of the mounting seat (2).
2. The hydro turbine floating seal ring mounting structure of claim 1, wherein, The number of the ring grooves (8) is 3, and the three ring grooves (8) are respectively a first groove, a second groove and a third groove along the axis direction of the mounting seat (2); An oil outlet hole (13) is further arranged on the support ring (1), and the hole opening at one end of the oil outlet hole (13) is arranged on the outer wall of the support ring (1), and the hole opening at the other end is arranged on the groove bottom of the second groove.
3. The hydro turbine floating seal ring mounting structure of claim 1, wherein, The number of the locking mechanisms (4) is multiple, and the locking mechanisms (4) are arranged along the circumferential direction of the mounting seat (2); The locking mechanism (4) comprises a locking pin (5) and a pin cap (9), each locking mechanism (4) is provided with a pin hole (6) on the baffle (7), and the locking pin (5) of each locking mechanism (4) is arranged through the pin hole (6) and penetrates the ring groove (8) at the end of the mounting seat (2), and the pin cap (9) is arranged at the end of the locking pin (5) to limit the locking pin (5) in the axis direction of the mounting seat (2).
4. The hydro turbine floating seal ring mounting structure of claim 1, wherein, The support ring (1) is formed by two independent half rings, and the mounting seat (2) is formed by the inner side of the half rings, and the inner side of each half ring is provided with a plurality of baffles (7); The end of each half ring is provided with a connecting plate (12), and the connecting plate (12) is provided with a bolt hole (11) for splicing the half rings.
5. The hydro turbine floating seal ring mounting structure of claim 1, wherein, The support ring (1) is a lower cover plate of a bearing seat of a water turbine.
6. A floating seal assembly for a hydraulic turbine, comprising a stationary ring and a floating seal ring (3) mounted on the stationary ring, characterized in that The static ring is the water turbine floating seal ring mounting structure of any one of claims 1 to 5; Each ring groove (8) at the end of the mounting seat (2) is provided with a floating seal ring (3), and the outer side of the floating seal ring (3) is clamped between the baffles (7) on both sides of the ring groove (8), and the floating seal ring (3) is locked in the ring groove (8) by the locking mechanism (4).
7. The hydro turbine floating seal assembly of claim 6, wherein, The floating seal ring (3) comprises two or more ring segments, and the floating seal ring (3) is an annular structure formed by splicing the ring segments.
8. The hydro turbine floating seal assembly of claim 6, wherein, The floating seal ring (3) at one end of the mounting seat (2) is a nitrile rubber seal ring, and the floating seal ring (3) at the other end is a polyurethane seal ring.
9. The hydro turbine floating seal assembly of claim 6, wherein, A breathing valve is further arranged, which is used to balance the pressure between the ring grooves (8) between the floating seal rings (3) and the external environment of the support ring (1).
10. A hydraulic turbine comprising a main shaft and a floating seal assembly cooperating with the main shaft, characterized in that, The floating seal assembly is the water turbine floating seal assembly of any one of claims 6 to 9.