Automatic pressure regulating sealed water supply device with centrifugal water retaining ring

Abstract

The present invention discloses an automatic pressure-regulating sealed water supply device with a centrifugal water baffle ring. A front water baffle cover with a U-shaped water guide ring groove and a main pipe hole is fixed to the front end of a sealed casing with a drain pipe and a support frame. The sealed casing is fixed to an equipment base. A rotating connecting pipe with a water baffle ring, a water throwing arc surface and a centrifugal guide ring is fixed to the end face of a rotor water supply pipe. 4 to 8 split sealing bodies with cooling water ring grooves and an outer diameter sleeved with a rubber sealing pre-tightening sleeve are placed in a water pressure ring cavity. One end of the split sealing body has an outer diameter tenon head and a tenon head sealing surface, and the other end has an inner diameter tenon head. There is a reduced diameter amount at the lap joint. The water pressure ring cavity is communicated with a water supply ring with a plurality of axial water pressure holes through a ring cavity water supply hole. An inner sealing cover with an inner pipe hole and an anti-rotation pin is fixed to the end face of a pressure-regulating cavity ring. The anti-rotation pin is placed in an anti-rotation blind hole. A water supply seat ring is fixed to the sealed casing. A connecting pipe is connected to a water supply pipe of high-pressure cooling water. This solution will be widely applied in this field.

Description

Technical Field:

[0001] The present invention is a sealing device for the dynamic and static connection position that provides high-pressure cooling water for the rotor of a water-cooled generator or a synchronous condenser. Background Art:

[0002] Currently, the dynamic and static joint position that provides high-pressure cooling water for the rotor of a water-cooled generator or a synchronous condenser still uses the traditional packing method for sealing. This method not only results in a large amount of water leakage due to severe wear, but also requires maintenance personnel to frequently maintain and adjust the packing sealing pressure in order to minimize the water leakage at the connection position between the fixed water supply pipe and the high-speed rotating connecting pipe as much as possible. Therefore, there is an urgent need in the art for a sealing water supply device for the dynamic and static connection position of the high-pressure cooling water of the rotor of a water-cooled generator or a synchronous condenser that has a simple structure, is easy to install, has a good sealing effect, and requires little or no maintenance. Summary of the Invention:

[0003] The present invention aims to provide a water-cooled generator and a high-pressure cooling water sealing device for a synchronous condenser rotor with good sealing effect and less maintenance. Its main technical features are as follows: There is a main pipe hole in the center of the front water baffle covering the end of the rotor water supply pipe, and a U-shaped water guide ring groove is fixed inside. The front end of the rotating connecting pipe fixed on the end of the rotor water supply pipe is provided with a water baffle ring, a water throwing arc surface, a centrifugal guiding ring, and a plurality of cooling water supply holes with a diameter of Φ2 to Φ5 mm are drilled in the middle and rear parts. A sealing casing with coupling flanges at both ends, a drain pipe and a support frame fixed at the lower end is sleeved on the rotating connecting pipe, and is fixed on the equipment base by coupling bolts through the coupling holes on the support frame and the base screw holes. The sealing casing is concentric with the rotating connecting pipe, and the front water baffle is fixed on the coupling flange at the front end of the sealing casing by coupling bolts through the coupling holes. Inside the water supply seat ring with screw holes, a water supply seat flange, a connecting pipe, and a coupling flange, there is a water supply ring, a plurality of annular cavity water supply holes, and a plurality of axial water pressure holes. After corresponding lap joints of 4 to 8 split sealing bodies with an outer diameter tenon and a tenon sealing surface at one end and an inner diameter tenon at the other end are placed inside the water pressure ring cavity, the outer diameter tenon and the inner diameter tenon are sealed and lapped in an inclined plane sealing manner. Each split sealing body has an anti-rotation blind hole on it. A reduced diameter amount is left at the butt joint position of the corresponding outer diameter tenon and inner diameter tenon, and at the end face of the tenon sealing surface and the end face of another corresponding split sealing body. The wear compensation amount of the sealing ring composed of 4 to 8 split sealing bodies is provided by the reduced diameter amount. There is a cooling water ring groove on the inner diameter of each split sealing body. A rubber sealing pre-tightening sleeve is sleeved on the outer diameter of the sealing ring composed of 4 to 8 split sealing bodies. An inner sealing cover with an inner pipe hole and 4 to 8 anti-rotation pins is fixed on the end face of the pressure regulating cavity ring by coupling bolts through the coupling holes on the inner sealing cover and the screw holes on the pressure regulating cavity ring, and 4 to 8 anti-rotation pins are respectively placed in 4 to 8 anti-rotation blind holes. The water supply seat ring with the inner sealing cover, the rubber sealing pre-tightening sleeve, and 4 to 8 split sealing bodies is sleeved on the outer diameter of the rotating connecting pipe and pushed into the sealing casing, so that the cooling water ring groove corresponds to a plurality of cooling water supply holes. The water supply seat ring is fixed on the coupling flange at the rear end of the sealing casing by coupling bolts through the coupling holes on the coupling flange and the water supply seat flange. The connecting pipe is connected to the water supply pipe by coupling bolts through the coupling flange on the connecting pipe and the coupling flange on the water supply pipe. All coupling surface positions in this device adopt a sealing structure to ensure that there is no leakage of high-pressure cooling water at the coupling. The annular cavity water supply holes and the water supply ring form a channel for supplying pressure water to the water pressure ring cavity, providing a radial water pressure pre-tightening force for the sealing ring composed of split sealing bodies, and the axial water pressure holes provide an axial sealing pressure for the sealing ring. The two sides of the rubber sealing pre-tightening sleeve are in good contact with the inner surface of the inner sealing cover and the inner surface of the water pressure ring cavity, further improving the sealing effect. Moreover, the gaps formed by all inner and outer diameter tenons with reduced diameter are completely sealed radially, cutting off the leakage channel of high-pressure cooling water from here. The high-pressure cooling water in the cooling ring groove is injected through the cooling water supply holes, mainly used to reduce the high temperature generated by the friction of the split sealing bodies, and another function is to lubricate the split sealing bodies.

[0004] The technical effects achieved by the technical solution provided by the present invention are realized as follows: Before the water-cooled generator or synchronous condenser is started, the water supply pipe provides high-pressure cooling water to the rotor water supply pipe through the rotating connecting pipe. At this time, the pressure of the high-pressure cooling water is very high. At this time, in addition to the pre-tightening force provided by the rubber sealing pre-tightening sleeve, the pressure of the high-pressure cooling water in the water pressure ring cavity also forms a pressure through the product of pressure and area and is converted into a pre-tightening force. The pre-tightening force synthesized by the two can make the sealing ring composed of split sealing bodies contact the outer surface of the rotating connecting pipe well, and its sealing performance is better. This is the static sealing state when the water-cooled generator or synchronous condenser is not started. When the water-cooled generator or synchronous condenser starts, the negative pressure formed by the centrifugal force generated at the water outlet end on the other side of the rotor will reduce the pressure of the high-pressure cooling water in the rotating connecting pipe and the connecting pipe, thereby also reducing the pressure of the high-pressure cooling water in the water pressure ring cavity. The pre-tightening force of the sealing ring composed of split sealing bodies will also decrease accordingly, and the frictional force formed by the pre-tightening force will also decrease, reducing the wear amount of the split sealing bodies and extending the service life of the split sealing bodies, and reducing the maintenance workload of maintenance personnel. In short, the pre-tightening force of the sealing ring composed of split sealing bodies and rubber sealing pre-tightening sleeves increases with the increase of the pressure of the high-pressure cooling water in the water pressure ring cavity and decreases with the decrease. This pre-tightening force is the sealing pressure of the sealing ring composed of split sealing bodies on the high-pressure cooling water. Multiple axial water pressure holes make the entire sealing ring press against the inner surface of the inner sealing cover to prevent water leakage here. 4 to 8 anti-rotation pins prevent the entire sealing ring from rotating due to the frictional force with the surface of the rotating connecting pipe through 4 to 8 anti-rotation blind holes. The compensation amount of the sealing ring composed of 4 to 8 split sealing bodies is determined by the amount of diameter reduction. If the high-pressure cooling water leaks outward from the inner surface of the sealing ring and the outer surface of the rotating connecting pipe, the water retaining ring, water throwing arc surface and centrifugal guiding ring on the rotating connecting pipe will throw the leaked high-pressure cooling water inward under the action of centrifugal force to prevent the leaked high-pressure cooling water from leaking outward through the main pipe hole. To further prevent the high-pressure cooling water from leaking outward through the main pipe hole, the device also fixes a U-shaped water guiding ring groove outside the diameter of the main pipe hole on the inner side of the front water retaining cover. When water droplets splash on the inner surface of the front water retaining cover, these water droplets can flow into the U-shaped water guiding ring groove and be led to the lower part of the sealing casing. After the high-pressure cooling water retained inside the sealing casing is aggregated, it is discharged to a designated position through the drain pipe. The device prevents the high-pressure cooling water from leaking outward from the dynamic and static sealing parts of the surface of the rotating connecting pipe through split sealing bodies and rubber sealing pre-tightening sleeves; and prevents the high-pressure cooling water from leaking outward through the main pipe hole through the water retaining ring, water throwing arc surface and centrifugal guiding ring. Therefore, the device perfectly solves the technical problems such as poor sealing and large maintenance workload existing in the prior art using packing dynamic and static sealing methods.

[0005] The structure of the present invention is simple and clear, and the design is ingenious. It makes full use of the rubber sealing pre-tightening sleeve, which can not only play a sealing role but also provide a pre-tightening force - sealing pressure for the entire sealing ring. At the same time, it utilizes the different high-pressure cooling water pressures during the start-up and shutdown of a water-cooled generator or synchronous condenser to automatically adjust the friction force between the sealing ring and the surface of the rotating connecting pipe. When the high-pressure cooling water pressure is high, the rotating connecting pipe does not rotate. At this time, the high-pressure cooling water pressure is the highest, but the inner diameter of the sealing ring does not wear, and there is no need to compensate for the wear amount. When the water-cooled generator or synchronous condenser is working, the rotating connecting pipe rotates with friction. At this time, the high-pressure cooling water pressure is the lowest. Therefore, the inner diameter of the sealing ring wears the least, and the compensation amount is also small, thereby reducing the wear amount of the sealing ring, increasing the working life of the sealing ring composed of split sealing bodies, and reducing the maintenance amount. The technical solution provided by the present invention has novelty, creativity, and practicality compared with the prior art, and will surely be widely applied in the power field and related fields. BRIEF DESCRIPTION OF THE DRAWINGS:

[0006] Figure 1 . Front view of the centrifugal water-blocking automatic pressure-regulating sealing water supply device

[0007] Figure 2 . A-A view of the centrifugal water-blocking automatic pressure-regulating sealing water supply device

[0008] Figure 3 . B-B view of the centrifugal water-blocking automatic pressure-regulating sealing water supply device

[0009] Figure 4 . Split sealing body view of the centrifugal water-blocking automatic pressure-regulating sealing water supply device

[0010] Figure 5 . C-C three-view drawing of the centrifugal water-blocking automatic pressure-regulating sealing water supply device

[0011] Figure 6 . D-D three-view drawing of the centrifugal water-blocking automatic pressure-regulating sealing water supply device

[0012] Figure 7 . E-E three-view drawing of the centrifugal water-blocking automatic pressure-regulating sealing water supply device

[0013] Wherein:

[0014] 1. Rotor water supply pipe; 2. Main pipe hole; 3. Front water-blocking cover

[0015] 4. U-shaped water guide ring groove; 5. Bolting; 6. Bolting flange

[0016] 7. Bolting hole; 8. Water-blocking ring; 9. Water-throwing arc surface

[0017] 10. Sealing cylinder; 11. Centrifugal guiding ring; 12. Inner pipe hole

[0018] 13. Anti-rotation pin 14. Inner sealing cover 15. Screw hole

[0019] 16. Pressure regulating cavity ring 17. Water pressure ring cavity 18. Rubber sealing pre-tightening sleeve

[0020] 19. Water supply seat flange 20. Ring cavity water supply hole 21. Water supply ring

[0021] 22. Water supply seat ring 23. Axial water pressure hole 24. Connecting pipe

[0022] 25. Water supply pipe 26. High-pressure cooling water 27. Split sealing body

[0023] 28. Cooling water supply hole 29. Rotary connecting pipe 30. Support frame

[0024] 31. Equipment base 32. Base screw hole 33. Cooling water ring groove

[0025] 34. Anti-rotation blind hole 35. Drain pipe 36. Water retaining cover hole

[0026] 37. Rotor water pipe screw hole 38. Inner diameter tenon 39. Outer diameter tenon

[0027] 40. Inclined plane seal 41. Reduced diameter amount 42. Tenon sealing surface Specific implementation mode:

[0028] First, slip the front water baffle 3 with the main pipe hole 2, the U-shaped water guide ring groove 4 fixed inside, and the fastening hole 7 over the end of the rotor water supply pipe 1; fasten the rotary connecting pipe 29 with a water baffle ring 8, a water throwing arc surface 9, a centrifugal guiding ring 11, a water baffle hole 36 at the front end, and multiple cooling water supply holes 28 drilled in the middle and rear parts concentrically to the rotor water supply pipe 1 through the water baffle hole 36 and the rotor water pipe screw hole 37 with the fastening bolt 5. After slipping the sealing casing 10 with fastening flanges 6 at both ends, a drain pipe 35 and a support frame 30 at the lower part over the rotary connecting pipe 29, fix the sealing casing 10 on the equipment base 31 through the 4 fastening holes 7 on the support frame 30 and the 4 base screw holes 32 with the fastening bolt 5, and make it concentric with the rotary connecting pipe 29. Fix the front water baffle 3 on the fastening flange 6 in front of the sealing casing 10 through the fastening hole 7 with the fastening bolt 5. Inside the water supply seat ring 22 with a pressure regulating chamber ring 16, a water supply seat flange 19, a connecting pipe 24 and a fastening flange 6 on the outside, there are a water pressure ring chamber 17, an axial water pressure hole 23, a ring chamber water supply hole 20 and a water supply ring 21, and the water supply ring 21 is communicated with the connecting pipe 24. Place 4 to 8 split sealing bodies 27 with an outer diameter tenon 39 and a tenon sealing surface 42 processed at one end and an inner diameter tenon 38 processed at the other end in the water pressure ring chamber 17, and the outer diameter tenon 39 and the inner diameter tenon 38 are overlapped correspondingly in the way of inclined surface sealing as shown in Figure 40. At the same time, there is a reduced diameter amount 41 at the corresponding positions of the outer diameter tenon 39 and the inner diameter tenon 38, and at the corresponding positions of the end surface of the tenon sealing surface 42 and the end surface of the corresponding other split sealing body 27. Process an anti-rotation blind hole 34 on the side of each split sealing body 27, and process an interconnected cooling water ring groove 33 on the inner diameter of each split sealing body 27. Slip the rubber sealing pre-tightening sleeve 18 over the outer diameter of the sealing ring composed of 4 to 8 split sealing bodies 27. Fix the inner sealing cover 14 with an inner pipe hole 12 and 4 to 8 anti-rotation pins 13 on the end surface of the pressure regulating chamber ring 16 through the fastening hole 7 and the screw hole 15 with the fastening bolt 5, and the 4 to 8 anti-rotation pins 13 are correspondingly placed in the 4 to 8 anti-rotation blind holes 34. Push the water supply seat ring 22 equipped with the rubber sealing pre-tightening sleeve 18, 4 to 8 split sealing bodies 27 and the inner sealing cover 14 along the outer diameter surface of the rotary connecting pipe 29 into the sealing casing 10 so that the cooling water ring groove 33 corresponds to the cooling water supply hole 28. Fix the water supply seat flange 19 on the fastening flange 6 at the rear end of the sealing casing 10 with the fastening bolt 5. Connect the fastening flange 6 of the connecting pipe 24 with the fastening flange 6 on the water supply pipe 25 with the fastening bolt 5, and the high-pressure cooling water 26 can be injected into the rotor water supply pipe 1 through the connecting pipe 24 and the rotary connecting pipe 29. The implementation is completed.

Claims

1. An automatic pressure-regulating sealed water supply device with a centrifugal water baffle ring, characterized in that, The center of the front water baffle cover sleeved on the end of the rotor water supply pipe has a main pipe hole and a U-shaped water guide ring groove fixed inside. The front end of the rotary connecting pipe fixed on the end of the rotor water supply pipe is provided with a water baffle ring, a water throwing arc surface, a centrifugal guide ring, and a plurality of cooling water supply holes with a diameter of Φ2 to Φ5 mm drilled in the middle and rear parts; the sealing cylinder with coupling flanges at both ends, a drain pipe and a support frame fixed at the lower end is sleeved on the rotary connecting pipe, and is fixed on the equipment base through the coupling holes on the support frame and the screw holes on the base with coupling bolts. The sealing cylinder is concentric with the rotary connecting pipe, and the front water baffle cover is fixed on the coupling flange at the front end of the sealing cylinder through the coupling holes with coupling bolts; inside the water supply seat ring with screw holes, a water supply seat flange, a connecting pipe and a coupling flange, there is a water supply ring, a plurality of annular cavity water supply holes and a plurality of axial water pressure holes; 4 to 8 split sealing bodies with an outer diameter tenon and a tenon sealing surface at one end and an inner diameter tenon at the other end are correspondingly lapped and placed inside the water pressure ring cavity, and the outer diameter tenon and the inner diameter tenon are sealed and lapped in an inclined surface sealing manner. Each split sealing body has an anti-rotation blind hole; there is a reduced diameter amount left at the docking position of the corresponding outer diameter tenon and inner diameter tenon, and the end face of the tenon sealing surface and the end face of another corresponding split sealing body. The wear compensation amount of the sealing ring composed of 4 to 8 split sealing bodies is provided by the reduced diameter amount; there is a cooling water ring groove on the inner diameter of each split sealing body; a rubber sealing pre-tightening sleeve is sleeved on the outer diameter of the sealing ring composed of 4 to 8 split sealing bodies, and the inner sealing cover with an inner pipe hole and 4 to 8 anti-rotation pins is fixed on the end face of the pressure regulating cavity ring through the coupling holes on the inner sealing cover and the screw holes on the pressure regulating cavity ring with coupling bolts, and 4 to 8 anti-rotation pins are correspondingly placed in 4 to 8 anti-rotation blind holes; the water supply seat ring with the inner sealing cover, the rubber sealing pre-tightening sleeve and 4 to 8 split sealing bodies is sleeved on the outer diameter of the rotary connecting pipe and pushed into the sealing cylinder, so that the cooling water ring groove corresponds to a plurality of cooling water supply holes, and the water supply seat ring is fixed on the coupling flange at the rear end of the sealing cylinder through the coupling holes on the coupling flange and the water supply seat flange with coupling bolts, and the connecting pipe is connected to the water supply pipe through the coupling flanges on the connecting pipe and the water supply pipe with coupling bolts.

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