Steam sootblower lance seal
The design of the inclined ring and the elastic support ring solves the problem of jamming in the sealing structure of the steam soot blowing device, enabling the outer pipe to operate flexibly when no steam is supplied and to effectively seal when steam is supplied, ensuring that rotation is not affected.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- INNER MONGOLIA THREE GORGES MENGNENG ENERGY CO LTD DALAT BANNER THERMAL POWER BRANCH
- Filing Date
- 2025-09-17
- Publication Date
- 2026-07-14
AI Technical Summary
The sealing structure of the existing steam telescopic rotary soot blowing device has high friction between the outer and inner pipes due to the packing compression, which affects the flexibility of operation and causes jamming problems.
The inclined ring deforms under air pressure to press against the inner tube to achieve a seal. Combined with an elastic support ring and spring assembly, it ensures that the outer tube can operate flexibly when steam is not flowing, and can be sealed without affecting rotation when steam is flowing.
It improves the operational flexibility and rotation of the outer tube, reduces wear on sealing components, and avoids jamming caused by steam pressure.
Smart Images
Figure CN224497861U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of soot blowing devices for thermal power plants, and in particular to a sealing structure for the nozzle of a steam soot blowing device. Background Technology
[0002] The steam telescopic rotary sootblowing device is installed on the outer wall of the boiler body in thermal power plants. During operation, steam is passed through the inner tube, causing the outer tube to rotate and extend on top of the inner tube. When the end of the outer tube furthest from the inner tube enters the boiler body, the steam cleans the accumulated ash from the heated surfaces inside the boiler. To prevent steam leakage at the joint between the outer and inner tubes, a sealing structure is installed between them.
[0003] The current sealing structure used in the steam telescopic rotary sootblower is similar to the sealing structure between the inner and outer sootblower pipes of a long telescopic steam sootblower disclosed in CN205479854U. Both use packing for sealing, and the packing is made of packing gland. The packing is pressed tightly by the packing gland. When the packing is pressed tightly, the friction between the outer pipe and the inner pipe increases greatly, causing the outer pipe to jam when rotating or telescopic, and making it inflexible in operation. Utility Model Content
[0004] The technical problem to be solved by this utility model is to address the problems existing in the background art and provide a sealing structure for the nozzle of a steam soot blowing device. When steam is not introduced into the inner pipe, the sealing component does not contact the inner pipe, improving the flexibility of the outer pipe operation. When steam is introduced into the inner pipe, the inclined ring deforms under the action of air pressure and abuts against the inner pipe, thereby sealing the outer pipe with the inner pipe. After sealing, due to the small sealing contact area, it does not affect the rotation of the outer pipe.
[0005] To achieve the above-mentioned technical features, the purpose of this utility model is as follows: A sealing structure for a steam soot blowing device nozzle includes an inner tube and an outer tube. An installation groove is provided on the inner wall of one end of the outer tube, and a sealing component is installed in the installation groove. An end cap is installed on the end of the outer tube located at one end of the installation groove by screws. The end cap has a central hole. One end of the inner tube passes through the end cap and the sealing component and then enters the outer tube. The sealing component includes a retaining ring and at least one sealing ring. The retaining ring is installed at the bottom of the installation groove, and the sealing ring is installed between the retaining ring and the end cap. The sealing ring includes a support ring, an extension ring, and a bevel ring. The extension ring is fixed to the end of the support ring near the end cap. The outer diameter of the extension ring is the same as the outer diameter of the support ring, and its inner diameter is smaller than the inner diameter of the support ring. The bevel ring is located inside the extension ring. The larger end of the bevel ring is fixedly connected to the end of the extension ring away from the support ring, and the smaller end of the bevel ring is close to the support ring. The bevel ring is elastic, and the smaller end of the bevel ring has a mating surface. A gap is left between the mating surface and the inner tube. Gaps are left between the inner holes of the retaining ring and the support ring and the inner tube.
[0006] The outer circumferential wall of the support ring is provided with an outer mounting groove, and a channel is provided inside the support ring. One end of the channel is connected to the outer mounting groove, and the other end is connected to the space inside the inclined ring. An oil injection hole is provided on the outer tube at the position corresponding to the outer mounting groove, and a plug screw is installed in the thread of the oil injection hole.
[0007] The sealing assembly also includes an elastic support ring located between the sealing ring and the end cap. The elastic support ring includes a ring body, with multiple elastic plates arranged in a ring on one side of the ring body. The end of the elastic plate away from the ring body is inclined toward the axis of the ring body, and the elastic plate is elastically supported on the lower side of the inclined ring. A gap is left between the inner hole of the ring body and the inner tube.
[0008] The elastic sheet is inserted and fixed to the ring body.
[0009] A groove is provided on one end face of the ring body, and the elastic sheet is disposed on the inlaid ring, which is inlaid and fixed in the groove.
[0010] The sealing assembly also includes a spring assembly located on the end cap near the sealing ring. The spring assembly includes a first support ring, a second support ring, and a spring, with the spring supported between the first and second support rings.
[0011] The first support ring has a first limiting ring on the side facing the second support ring, and the second support ring has a second limiting ring on the side facing the first support ring. The two ends of the spring are respectively fitted onto the first limiting ring and the second limiting ring.
[0012] The mounting groove has a bearing mounting groove at one end near the end cover. A bearing is installed in the bearing mounting groove. The second support ring abuts against the bearing. There is a gap between the inner ring of the bearing and the outer wall of the inner tube. The inner tube and the inner ring of the bearing are slidably connected.
[0013] The second support ring has an extension ring on the outer circumference of the side that abuts against the bearing, and the extension ring abuts against the outer ring of the bearing.
[0014] The end cap is provided with an abutment ring on the outer circumference of the side facing the mounting groove, and the abutment ring abuts against the outer ring of the bearing.
[0015] The features of this utility model using the above-mentioned technical solution are:
[0016] 1. The sealing ring of this utility model includes a support ring, an extension ring, and a bevel ring. The extension ring is fixed at one end of the support ring near the end cap. The outer diameter of the extension ring is the same as the outer diameter of the support ring, and the inner diameter is smaller than the inner diameter of the support ring. The bevel ring is located inside the extension ring. The larger end of the bevel ring is fixedly connected to the end of the extension ring away from the support ring, and the smaller end of the bevel ring is close to the support ring. The bevel ring is elastic, and a mating surface is provided at the smaller end of the bevel ring. A gap is left between the mating surface and the inner tube. Gaps are also left between the inner hole of the retaining ring and the support ring and the inner tube. When steam is not introduced into the inner tube, the sealing assembly does not contact the inner tube, improving the flexibility of the outer tube operation. When steam is introduced into the inner tube, the bevel ring deforms under the action of air pressure and abuts against the inner tube, thereby sealing the outer tube with the inner tube. After sealing, since only the mating surface contacts the inner tube, the contact area is small and does not affect the rotation of the outer tube.
[0017] 2. The sealing assembly of this utility model also includes an elastic support ring, which is located between the sealing ring and the end cap. The elastic support ring includes a ring body, and multiple elastic plates are arranged in a ring on one side of the ring body. The elastic plates provide elastic support to the inclined ring, preventing severe deformation of the inclined ring due to high steam pressure, which would prevent the inclined ring from failing to rebound properly after the steam supply is stopped. Because the elastic plates provide elastic support on the lower side of the inclined ring, the inclined ring can rebound stably after the steam supply is stopped, preventing the outer pipe from getting stuck due to severe deformation of the inclined ring and failure to rebound properly.
[0018] 3. The sealing assembly of this utility model also includes a spring assembly, which is located on the side of the end cover near the sealing ring, so as to elastically limit the sealing assembly. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.
[0020] Figure 1 This is a cross-sectional structural diagram of the present invention.
[0021] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle.
[0022] Figure 3 This is a three-dimensional structural diagram of the retaining ring of this utility model.
[0023] Figure 4 This is a schematic diagram of a quarter section of the sealing ring in this utility model.
[0024] Figure 5 This is a three-dimensional structural diagram of the elastic support ring in this utility model.
[0025] Figure 6This is a schematic diagram of the split structure of the elastic support ring in this utility model.
[0026] Figure 7 This is a three-dimensional structural diagram of the spring assembly in this utility model.
[0027] Figure 8 This is a cross-sectional structural diagram of the spring assembly in this utility model.
[0028] Figure 9 This is a three-dimensional structural diagram of the end cap of this utility model.
[0029] Figure label:
[0030] Inner tube 10,
[0031] Outer tube 20, mounting groove 21, oil filling hole 22, plug screw 23, bearing mounting groove 24;
[0032] 30mm retaining ring;
[0033] Sealing ring 40, support ring 41, outer mounting groove 411, channel 412, extension ring 42, beveled ring 43, mating surface 431;
[0034] Elastic support ring 50, ring body 51, inlay groove 511, elastic sheet 52, inlay ring 53;
[0035] Spring assembly 60, first support ring 61, first limiting ring 611, second support ring 62, second limiting ring 621, extension ring 622, spring 63;
[0036] Bearing 70;
[0037] End cap 80, center hole 81, abutment ring 82;
[0038] Screw 90. Detailed Implementation
[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0040] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.
[0041] Example 1:
[0042] See Figure 1 , 2 3. A sealing structure for a steam soot blowing device nozzle, comprising an inner tube 10 and an outer tube 20. An installation groove 21 is provided on the inner wall of one end of the outer tube 20. A sealing assembly is installed in the installation groove 21. An end cap 80 is installed on the end of the outer tube 20 located at one end of the installation groove 21 by screws 90. The end cap 80 has a central hole 81. One end of the inner tube 10 passes through the end cap 80 and the sealing assembly and then enters the outer tube 20. The sealing assembly includes a retaining ring 30 and at least one sealing ring 40. The retaining ring 30 is installed at the bottom of the installation groove 21, and the sealing ring 40 is installed between the retaining ring 30 and the end cap 80. See also Figure 4 The sealing ring 40 includes a support ring 41, an extension ring 42, and a bevel ring 43. The extension ring 42 is fixed to one end of the support ring 41 near the end cap 80. The outer diameter of the extension ring 42 is the same as the outer diameter of the support ring 41, and the inner diameter is smaller than the inner diameter of the support ring 41. The bevel ring 43 is located inside the extension ring 42. The large end of the bevel ring 43 is fixedly connected to the end of the extension ring 42 away from the support ring 41, and the small end of the bevel ring 43 is close to the support ring 41. The bevel ring 43 is elastic. The small end of the bevel ring 43 is provided with a mating surface 431. A gap is left between the mating surface 431 and the inner tube 10. A gap is left between the inner hole of the retaining ring 30 and the support ring 41 and the inner tube 10. When steam is not introduced into the inner tube 10, the sealing component does not contact the inner tube 10, improving the operational flexibility of the outer tube 20. When steam is introduced into the inner tube 10, the inclined ring 43 deforms under the action of air pressure and comes into contact with the inner tube 10, thereby sealing the outer tube 20 with the inner tube 10. After sealing, since only the mating surface 431 contacts the inner tube 10, the contact area is small and does not affect the rotation of the outer tube 20.
[0043] In use, the inner tube 10 is fixed, and the outer tube 20 is guided to extend, retract, or rotate on the inner tube 10.
[0044] See Figure 1 , 24. The outer circumferential wall of the support ring 41 is provided with an outer mounting groove 411, and a channel 412 is provided inside the support ring 41. One end of the channel 412 communicates with the outer mounting groove 411, and the other end communicates with the space inside the inclined ring 43. An oil injection hole 22 is provided on the outer tube 20 at the position corresponding to the outer mounting groove 411. A plug screw 23 is installed in the threaded part of the oil injection hole 22. Through the above structure, grease can be injected into the sealing ring 40 to reduce the wear of the sealing ring 40 and improve the operational flexibility of the outer tube 20.
[0045] When adding oil, unscrew the plug screw 23 and inject grease through the oil injection hole 22. See 2. The grease is injected into the space inside the inclined ring 43 through the channel 412.
[0046] In this embodiment, the retaining ring 30 can be made of plastic; the support ring 41 and the extension ring 42 are made of hard rubber, and the inclined ring 43 is made of elastic rubber.
[0047] Example 2:
[0048] Based on Example 1, see Figure 1 , 5 6. The sealing assembly also includes an elastic support ring 50, located between the sealing ring 40 and the end cap 80. The elastic support ring 50 includes a ring body 51, with multiple elastic plates 52 arranged annularly on one side of the ring body 51. The ends of the elastic plates 52 away from the ring body 51 are inclined towards the axis of the ring body 51, and the elastic plates 52 are elastically supported on the lower side of the inclined ring 43. A gap is left between the inner hole of the ring body 51 and the inner tube 10. The elastic plates 52 elastically support the inclined ring 43 to prevent severe deformation of the inclined ring 43 due to high steam pressure, which would prevent the inclined ring 43 from rebounding properly after the steam supply is stopped. Because the elastic plates 52 are elastically supported on the lower side of the inclined ring 43, such as... Figure 2 As shown, the inclined ring 43 can rebound stably after the steam supply stops, and the outer tube 20 will not be blocked due to severe deformation of the inclined ring 43 preventing it from rebounding normally.
[0049] In one embodiment, multiple elastic sheets 52 are inserted and fixed to a ring 51. The elastic sheets 52 can be made of stainless steel, and the ring 51 can be made of plastic.
[0050] Of course, the elastic sheet 52 and the ring 51 can also be made of a one-piece plastic structure.
[0051] In this embodiment, see Figure 6 One end face of the ring body 51 is provided with an inlay groove 511, and the elastic sheet 52 is disposed on the inlay ring 53, which is inlaid and fixed in the inlay groove 511. The ring body 51 is made of plastic, while the elastic sheet 52 and the inlay ring 53 are made of stainless steel in a single integrated structure.
[0052] Example 3:
[0053] Based on Example 1 or Example 2, see Figure 1 , 7 The sealing assembly also includes a spring assembly 60, which is located on the end cap 80 near the sealing ring 40 to provide elastic restraint for the sealing assembly.
[0054] See Figure 7 The spring assembly 60 includes a first support ring 61, a second support ring 62, and a spring 63, with the spring 63 supported between the first support ring 61 and the second support ring 62.
[0055] See Figure 8 The first support ring 61 has a first limiting ring 611 on the side facing the second support ring 62, and the second support ring 62 has a second limiting ring 621 on the side facing the first support ring 61. The two ends of the spring 63 are respectively fitted onto the first limiting ring 611 and the second limiting ring 621.
[0056] Example 4:
[0057] Based on Example 1, Example 2, or Example 3, see [link to example]. Figure 1 A bearing mounting groove 24 is provided at one end of the mounting groove 21 near the end cover 80. A bearing 70 is installed in the bearing mounting groove 24. The second support ring 62 abuts against the bearing 70. There is a gap between the inner ring of the bearing 70 and the outer wall of the inner tube 10. The inner tube 10 and the inner ring of the bearing 70 are slidably connected. By installing the bearing 70, the inner tube 10 and the outer tube 20 can be guided to prevent the outer tube 20 from being misaligned with the inner tube 10 beyond a threshold during movement. When the outer tube 20 rotates, the outer tube 20 and the inner tube 10 can rotate through the bearing 70 or through the inner ring of the bearing 70. When the outer tube 20 extends or retracts, the inner ring of the bearing 70 slides with the inner tube 10.
[0058] See Figure 1 , 7 The second support ring 62 has an extension ring 622 on the outer circumference of the side that abuts against the bearing 70. The extension ring 622 abuts against the outer ring of the bearing 70. The second support ring 62 does not affect the rotation of the inner ring of the bearing 70.
[0059] See Figure 1 , 9 An abutment ring 82 is provided on the outer circumference of the end cover 80 facing the mounting groove 21. The abutment ring 82 abuts against the outer ring of the bearing 70, and the end cover 80 does not affect the rotation of the inner ring of the bearing 70. The end cover 80 is provided with mounting holes for screws 90 to pass through.
[0060] Example 5:
[0061] In this embodiment, see Figure 1 The sealing assembly includes a retaining ring 30, two sealing rings 40, two elastic support rings 50, a spring assembly 60, and a bearing 70. Specifically, the retaining ring 30, sealing ring 40, elastic support ring 50, sealing ring 40, elastic support ring 50, spring assembly 60, and bearing 70 are installed sequentially from the inside to the outside within the mounting groove 21. The redundant design of the double sealing rings 40 and double spring assembly 60 improves the stability of the seal.
[0062] The working principle or working process of this utility model:
[0063] See Figure 1 , 2 When in use, the sealing component does not contact the inner tube 10 when no steam is introduced into the inner tube 10, thus improving the operational flexibility of the outer tube 20.
[0064] When steam is introduced into the inner tube 10, the inclined ring 43 deforms under the action of air pressure and comes into contact with the inner tube 10, thereby sealing the outer tube 20 with the inner tube 10. After sealing, only the mating surface 431 contacts the inner tube 10. The contact area is small and does not affect the rotation of the outer tube 20.
[0065] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Any modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.
Claims
1. A sealing structure for a steam soot blowing device nozzle, comprising an inner tube (10) and an outer tube (20), wherein an installation groove (21) is provided on the inner wall of one end of the outer tube (20), a sealing component is installed in the installation groove (21), and an end cap (80) is installed on the end of the outer tube (20) located at one end of the installation groove (21) by screws (90), the end cap (80) being provided with a central hole (81), and one end of the inner tube (10) passing through the end cap (80) and the sealing component and then entering the outer tube (20); characterized in that: The sealing assembly includes a retaining ring (30) and at least one sealing ring (40). The retaining ring (30) is installed at the bottom of the mounting groove (21), and the sealing ring (40) is installed between the retaining ring (30) and the end cap (80). The sealing ring (40) includes a support ring (41), an extension ring (42), and a beveled ring (43). The extension ring (42) is fixed to one end of the support ring (41) near the end cap (80). The outer diameter of the extension ring (42) is the same as the outer diameter of the support ring (41), and its inner diameter is smaller than that of the support ring (41). The inner diameter of the inner tube (10) is such that the inclined ring (43) is located inside the extension ring (42), the large end of the inclined ring (43) is fixedly connected to the end of the extension ring (42) away from the support ring (41), and the small end of the inclined ring (43) is close to the support ring (41); the inclined ring (43) is elastic, and the small end of the inclined ring (43) is provided with a mating surface (431), and there is a gap between the mating surface (431) and the inner tube (10), and there is a gap between the inner hole of the retaining ring (30) and the support ring (41) and the inner tube (10).
2. The sealing structure of the nozzle of a steam soot blowing device according to claim 1, characterized in that: The outer circumferential wall of the support ring (41) is provided with an outer mounting groove (411), and a channel (412) is provided inside the support ring (41). One end of the channel (412) is connected to the outer mounting groove (411), and the other end is connected to the space inside the inclined ring (43). An oil injection hole (22) is provided on the outer tube (20) at the position corresponding to the outer mounting groove (411), and a plug screw (23) is installed in the threaded part of the oil injection hole (22).
3. The sealing structure of the nozzle of a steam soot blowing device according to claim 1, characterized in that: The sealing assembly also includes an elastic support ring (50), which is located between the sealing ring (40) and the end cap (80). The elastic support ring (50) includes a ring body (51), and a plurality of elastic pieces (52) are arranged in a ring on one side of the ring body (51). The end of the elastic piece (52) away from the ring body (51) is inclined toward the axis of the ring body (51), and the elastic piece (52) is elastically supported on the lower side of the inclined ring (43). A gap is left between the inner hole of the ring body (51) and the inner tube (10).
4. The sealing structure of the nozzle of a steam soot blowing device according to claim 3, characterized in that: The elastic sheet (52) is inserted and fixed to the ring (51).
5. The sealing structure of the nozzle of a steam soot blowing device according to claim 3, characterized in that: The ring body (51) has an inlay groove (511) on one end face, and the elastic sheet (52) is disposed on the inlay ring (53), and the inlay ring (53) is inlaid and fixed in the inlay groove (511).
6. A sealing structure for a steam soot blowing device nozzle according to claim 1 or 3, characterized in that: The sealing assembly also includes a spring assembly (60), which is located on the side of the end cap (80) near the sealing ring (40). The spring assembly (60) includes a first support ring (61), a second support ring (62), and a spring (63), which is supported between the first support ring (61) and the second support ring (62).
7. The sealing structure of the nozzle of a steam soot blowing device according to claim 6, characterized in that: The first support ring (61) has a first limiting ring (611) on the side facing the second support ring (62), and the second support ring (62) has a second limiting ring (621) on the side facing the first support ring (61). The two ends of the spring (63) are respectively fitted onto the first limiting ring (611) and the second limiting ring (621).
8. The sealing structure of the nozzle of a steam soot blowing device according to claim 6, characterized in that: The mounting groove (21) has a bearing mounting groove (24) at one end near the end cover (80). A bearing (70) is installed in the bearing mounting groove (24). The second support ring (62) abuts against the bearing (70). There is a gap between the inner ring of the bearing (70) and the outer wall of the inner tube (10). The inner tube (10) and the inner ring of the bearing (70) are slidably connected.
9. The sealing structure of the nozzle of a steam soot blowing device according to claim 8, characterized in that: The second support ring (62) has an extension ring (622) on the outer circumference of the side that abuts against the bearing (70), and the extension ring (622) abuts against the outer ring of the bearing (70).
10. The sealing structure of the nozzle of a steam soot blowing device according to claim 8, characterized in that: The end cap (80) has an abutment ring (82) on its outer circumference facing the mounting groove (21), and the abutment ring (82) abuts against the outer ring of the bearing (70).