Grate tooth sealing structure of long-rod telescopic steam soot blower

Abstract

The invention provides a labyrinth sealing structure of a long-rod telescopic steam soot blower. When the soot blower spray gun pipe does spiral reciprocating motion, the non-contact characteristic of the novel labyrinth sealing structure can effectively solve the extrusion problem of a traditional graphite sealing structure in a long-rod spray gun pipe, and faults such as gun barrel telescopic jamming and steam leakage of a sealing ring do not occur. The labyrinth sealing structure of the long-rod telescopic steam soot blower is low in cost, long in service life, free of steam leakage, easy to transform and apply in the operation process of a power plant, capable of effectively solving the problems of a traditional graphite sealing structure and wide in application prospect.

Description

Technical Field

[0001] The invention relates to a grate sealing structure, in particular to a grate sealing structure of a long-rod telescopic steam soot blower. Background Art

[0002] At present, more than 90% of the coal-fired boilers in the world use steam sootblower devices, especially long-rod sootblower is often used for convection heating surface in boiler. One of the main problems faced by steam sootblower during use is leakage of sealing parts, which is mainly caused by the operation characteristics of sootblower and design defects of seal. The working trajectory of sootblower spray gun tube is uniform spiral axial operation, and the steam supply pipe is stationary to supply steam to the spray gun tube. Since the working medium is superheated steam, the temperature and pressure are high, and the sealing material between the steam supply pipe and the spray gun tube is always in a complex working state. The main sealing component of the traditional sootblower is only a simple ring equipped with graphite filler and packing. During operation, the eccentricity, radial runout and axial displacement of the steam supply pipe or spray gun tube will cause huge impact and wear on the graphite seal. Long-term operation will cause the sealing gap to become larger, the seal will fail, and the high-temperature and high-pressure steam will leak from the sealing part, causing the temperature difference between the inside and outside of the seal to be too large, resulting in deformation of the seal, and the problem of barrel extension and jamming, which has huge safety hazards. Therefore, it is necessary to transform the sealing structure of the sootblower.

[0003] In order to overcome the deficiencies in the technical background, the present invention discloses a long-rod telescopic steam sootblower grate seal structure. The core component of the grate seal structure is a straight-tooth annular seal. A gap is left between the seal and the inner tube, which can avoid jamming when the outer tube is telescoped. At the same time, the straight-tooth annular seal increases the energy dissipation of the fluid by using its unique geometric shape characteristics, which can effectively enhance the sealing effect. The present invention also has the characteristics of low cost, long service life and no steam leakage. It is easy to modify and apply during the operation of the power plant and has broad application prospects. Summary of the invention

[0004] A long-rod telescopic steam sootblower grate sealing structure, characterized in that: the steam sootblower structure comprises an outer tube 1, a pressure reducing ring 2, an inner tube 3, a spur ring seal a4, a spur ring seal b5, a spur ring seal c6, a spur ring seal d7, a spur ring seal e8, a liner ring 9, a clamping end cover 10 and a bolt 11; a spur ring seal a4, a spur ring seal b5, a spur ring seal c6, a spur ring seal d7, a spur ring seal e8 and a liner ring 9 are arranged between the inner tube 3 and the outer tube 1; the central axes of the outer tube 1, the pressure reducing ring 2, the inner tube 3, the spur ring seal a4, a spur ring seal b5, a spur ring seal c6, a spur ring seal d7, a spur ring seal e8, the liner ring 9 and the clamping end cover 10 completely overlap ; On the end surface of the compression end cover 10, a light hole 12 is opened every 45° along the circumferential direction with the central axis as the reference; On the end surface of the outer tube 1 facing the compression end cover 10, an outer tube screw hole 13 is opened every 45° along the circumferential direction with the central axis as the reference; The outer diameters of the pressure reducing ring 2, the spur ring seal a4, the spur ring seal b5, the spur ring seal c6, the spur ring seal d7, the spur ring seal e8 and the liner ring 9 are equal to the inner diameter of the sealing groove of the outer tube 1, and the inner diameter of the liner ring 9 is equal to the outer diameter of the inner tube 3; The pressure reducing ring 2, the spur ring seal a4, the spur ring seal b5, the spur ring seal c6, the spur ring seal d7, the spur ring seal e8, the liner ring 9 and the compression end cover 10 are arranged in sequence from the end where the inner tube 3 is inserted into the outer tube 1 as the starting point to the other end of the inner tube 3.

[0005] The pressure reducing ring 2 and the outer tube 1 are tightly matched, and the difference between the inner diameter of the pressure reducing ring 2 and the inner diameter of the inner tube 3 is greater than 10 mm.

[0006] The gap between the spur ring seal a4, the spur ring seal b5, the spur ring seal c6, the spur ring seal d7 and the spur ring seal e8 and the inner tube 3 is 0.5 mm; the gap between the spur ring seal a4, the spur ring seal b5, the spur ring seal c6, the spur ring seal d7 and the spur ring seal e8 and the sealing groove of the outer tube 1 is a clearance fit.

[0007] The spur-toothed annular seal a4, the spur-toothed annular seal b5, the spur-toothed annular seal c6, the spur-toothed annular seal d7 and the spur-toothed annular seal e8 have exactly the same structural shape.

[0008] There is a clearance fit between the liner ring 9 and the inner tube 3; there is a clearance fit between the liner ring 9 and the sealing groove of the outer tube 1. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is an overall cross-sectional view of the present invention;

[0010] Figure 2is an isometric view of a spur-tooth annular seal of the present invention;

[0011] Figure 3 is an isometric view of the pressure relief ring of the present invention;

[0012] Figure 4 is an isometric view of the compression end cap of the present invention;

[0013] Figure 5 is an isometric view of the bolt of the present invention;

[0014] Figure 6 is an isometric view of the liner ring of the present invention;

[0015] Figure 7 It is the right side view of the outer tube of the present invention. DETAILED DESCRIPTION

[0016] The following is combined with Figures 1 to 7 The present invention is further described in detail with specific implementation modes so that the objects, advantages and technical solutions of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0017] A long-rod telescopic steam sootblower grate sealing structure, characterized in that: the steam sootblower structure comprises an outer tube 1, a pressure reducing ring 2, an inner tube 3, a spur-tooth annular seal a4, a spur-tooth annular seal b5, a spur-tooth annular seal c6, a spur-tooth annular seal d7, a spur-tooth annular seal e8, a liner ring 9, a clamping end cover 10 and a bolt 11; a spur-tooth annular seal a4, a spur-tooth annular seal b5, a spur-tooth annular seal c6, a spur-tooth annular seal d7, a spur-tooth annular seal e8 and a liner ring 9 are arranged between the inner tube 3 and the outer tube 1; the outer tube 1, the pressure reducing ring 2, the inner tube 3, the spur-tooth annular seal a4, the spur-tooth annular seal b5, the spur-tooth annular seal c6, the spur-tooth annular seal d7, the ... The central axes of the toothed annular seal a4, the spur-toothed annular seal b5, the spur-toothed annular seal c6, the spur-toothed annular seal d7, the spur-toothed annular seal e8, the liner ring 9 and the clamping end cover 10 are completely overlapped; on the end face of the clamping end cover 10, a light hole 12 is opened every 45° along the circumferential direction with the central axis as the reference; on the end face of the outer tube 1 facing the clamping end cover 10, an outer tube screw hole 13 is opened every 45° along the circumferential direction with the central axis as the reference; the pressure reducing ring 2, the spur-toothed annular seal a4, the spur-toothed annular seal b5, the spur-toothed annular seal c6, the spur-toothed annular seal d7, the spur-toothed annular seal The outer diameters of the member e8 and the liner ring 9 are equal to the inner diameter of the sealing groove of the outer tube 1, and the inner diameter of the liner ring 9 is equal to the outer diameter of the inner tube 3; starting from the end where the inner tube 3 is inserted into the outer tube 1 to the other end of the inner tube 3, a pressure reducing ring 2, a spur ring seal a4, a spur ring seal b5, a spur ring seal c6, a spur ring seal d7, a spur ring seal e8, a liner ring 9 and a compression end cover 10 are arranged in sequence; the pressure reducing ring 2 is tightly matched with the outer tube 1, and the difference between the inner diameter of the pressure reducing ring 2 and the inner diameter of the inner tube 3 is greater than 10mm; the spur ring seal a4, the spur ring seal b5, the spur ring seal c6, the spur ring seal d7, the spur ring seal e8, the liner ring 9 and the compression end cover 10 are arranged in sequence; the pressure reducing ring 2 is tightly matched with the outer tube 1, and the difference between the inner diameter of the pressure reducing ring 2 and the inner diameter of the inner tube 3 is greater than 10mm; the spur ring seal a4, the spur ring seal b5, the spur ring seal The gap between seal c6, spur ring seal d7 and spur ring seal e8 and the inner tube 3 is 0.5mm; there is a clearance fit between spur ring seal a4, spur ring seal b5, spur ring seal c6, spur ring seal d7 and spur ring seal e8 and the sealing groove of the outer tube 1; the structural shapes of spur ring seal a4, spur ring seal b5, spur ring seal c6, spur ring seal d7 and spur ring seal e8 are exactly the same; there is a clearance fit between liner ring 9 and the inner tube 3; there is a clearance fit between liner ring 9 and the sealing groove of the outer tube 1.

[0018] The grate sealing structure of the long-rod telescopic steam soot blower of the present invention is implemented. When installing, the outer tube 1 is sleeved on the outer side of the inner tube 3. At the sealing part between the two tubes, the inner tube 3 is inserted into one end of the outer tube 1 as the starting point, and the pressure reducing ring 2, the spur ring seal a4, the spur ring seal b5, the spur ring seal c6, the spur ring seal d7, the spur ring seal e8, the liner ring 9 and the clamping end cover 10 are arranged in sequence to the other end of the inner tube 3; the outer tube screw hole 13 of the outer tube 1 and the light hole 12 on the clamping end cover 10 are aligned, and the clamping end cover 10 and the outer tube 1 are tightly fixed by bolts 11. The outer tube 1 is fixed to compact all the seals in the sealing groove to prevent the pressure relief ring 2, the spur ring seal a4, the spur ring seal b5, the spur ring seal c6, the spur ring seal d7, the spur ring seal e8 and the liner ring 9 from moving forward and backward in the axial direction; when the soot blower starts to work, the outer tube 1 extends and rotates. Due to the large pressure difference on both sides of the sealing structure, the pressure difference causes the high-temperature and high-pressure steam to flow along the spur ring seal a4, the spur ring seal b5, the spur ring seal c6, the spur ring seal d7, the spur ring seal e8 and the inner tube 3. When the fluid passes through the tooth tip of the comb teeth, the flow area is sharply reduced, resulting in a tooth tip throttling effect, which increases the fluid flow rate, reduces the pressure, converts the compression energy into kinetic energy, and forms a jet at a certain angle after flowing through the tooth tip; when the jet impacts the windward surface of the next comb tooth, the flow is hindered, the flow direction is changed, and part of the fluid is drawn into the tooth cavity, driving the fluid inside the tooth cavity to form a vortex; the fluid continues to expand and compress in the tooth cavity, forming a strong shear force, which increases the flow resistance of the fluid and reduces the leakage of steam; the liner ring 9 arranged at the end will pass through the straight tooth annular seal Parts a4, spur ring seals b5, spur ring seals c6, spur ring seals d7 and spur ring seals e8 reduce the pressure of leaking steam and increase the sealing performance; when the soot blower is working, the outer tube 2 rotates and retracts, and there are gaps between the spur ring seals a4, spur ring seals b5, spur ring seals c6, spur ring seals d7 and spur ring seals e8 and the inner tube 3. The non-contact working mode reduces friction loss and avoids the jamming of the gun barrel, thereby ensuring the safety of the inner and outer gun barrels and extending the service life of the inner and outer gun barrels.

[0019] Beneficial Effects

[0020] The present invention proposes a long-rod telescopic steam sootblower grate sealing structure. When the sootblower spray gun tube performs spiral reciprocating motion, the non-contact characteristics of the new grate sealing structure can effectively solve the extrusion problem of the traditional graphite sealing structure in the long-rod spray gun tube, and there will be no failures such as the barrel extension jamming and the steam leakage of the sealing ring. The long-rod telescopic steam sootblower grate sealing structure of the present invention has low cost, long service life, no steam leakage, is easy to modify and apply during the operation of the power plant, effectively solves the problems existing in the traditional graphite sealing structure, and has broad application prospects.

Claims

1. A long-rod telescopic steam sootblower grate sealing structure, characterized by: The steam soot blower structure comprises an outer tube (1), a pressure reducing ring (2), an inner tube (3), a spur ring seal a (4), a spur ring seal b (5), a spur ring seal c (6), a spur ring seal d (7), a spur ring seal e (8), a liner ring (9), a clamping end cover (10) and a bolt (11); the spur ring seal a (4), the spur ring seal b (5), the spur ring seal c (6), the spur ring seal d (7), the spur ring seal e (8) and the liner ring (9) are arranged between the inner tube (3) and the outer tube (1); the central axes of the outer tube (1), the pressure reducing ring (2), the inner tube (3), the spur ring seal a (4), the spur ring seal b (5), the spur ring seal c (6), the spur ring seal d (7), the spur ring seal e (8), the liner ring (9) and the clamping end cover (10) are completely overlapped; the clamping end cover (10) On the end surface of the outer tube (1), a light hole (12) is formed at intervals of 45° along the circumferential direction with the central axis as the reference; on the end surface of the outer tube (1) facing the clamping end cover (10), an outer tube screw hole (13) is formed at intervals of 45° along the circumferential direction with the central axis as the reference; the outer surfaces of the pressure reducing ring (2), the spur gear annular seal a (4), the spur gear annular seal b (5), the spur gear annular seal c (6), the spur gear annular seal d (7), the spur gear annular seal e (8) and the liner ring (9) are The inner diameter of the liner ring (9) is equal to the inner diameter of the sealing groove of the outer tube (1); the inner diameter of the liner ring (9) is equal to the outer diameter of the inner tube (3); and a pressure reducing ring (2), a spur-toothed annular seal a (4), a spur-toothed annular seal b (5), a spur-toothed annular seal c (6), a spur-toothed annular seal d (7), a spur-toothed annular seal e (8), a liner ring (9) and a compression end cover (10) are sequentially arranged from the end of the inner tube (3) inserted into the outer tube (1) as a starting point to the other end of the inner tube (3).

2. The long-rod telescopic steam soot blower grate sealing structure according to claim 1 is characterized in that: The pressure reducing ring (2) and the outer tube (1) are tightly matched, and the difference between the inner diameter of the pressure reducing ring (2) and the inner diameter of the inner tube (3) is greater than 10 mm.

3. The long-rod telescopic steam soot blower grate sealing structure according to claim 1 is characterized in that: The gap between the spur-toothed annular seal a (4), the spur-toothed annular seal b (5), the spur-toothed annular seal c (6), the spur-toothed annular seal d (7) and the spur-toothed annular seal e (8) and the inner tube (3) is 0.5 mm; the gap between the spur-toothed annular seal a (4), the spur-toothed annular seal b (5), the spur-toothed annular seal c (6), the spur-toothed annular seal d (7) and the spur-toothed annular seal e (8) and the sealing groove of the outer tube (1) is a clearance fit.

4. The long-rod telescopic steam sootblower grate sealing structure according to claim 1 is characterized in that: The structures and shapes of the spur-toothed annular seal a (4), the spur-toothed annular seal b (5), the spur-toothed annular seal c (6), the spur-toothed annular seal d (7) and the spur-toothed annular seal e (8) are completely the same.

5. The long-rod telescopic steam soot blower grate sealing structure according to claim 1 is characterized in that: There is a clearance fit between the liner ring (9) and the inner tube (3); there is a clearance fit between the liner ring (9) and the sealing groove of the outer tube (1).

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