Improved long-rod telescopic steam soot blower sealing structure

Abstract

The utility model aims to provide a sealing structure of a long-rod telescopic steam soot blower, which is low in cost, long in service life and capable of avoiding steam leakage, a novel sealing structure is designed, a fixed sealing element is changed into a swing sealing ring capable of swinging in the radial direction, and when a spray gun pipe of the soot blower does spiral reciprocating motion, the swing sealing ring can swing in the radial direction. The front-and-back movement characteristic of the swing sealing ring effectively solves the extrusion problem of a fixed sealing piece in a long-rod spray gun pipe, and faults such as telescopic jamming of a gun barrel and steam leakage of the sealing ring are avoided. The improved long-rod telescopic steam soot blower sealing structure 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 existing in a fixed sealing structure and wide in application prospect.

Description

Technical Field

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

[0002] Currently, over 90% of coal-fired boilers worldwide utilize steam sootblower systems, particularly long-rod sootblower systems for convection heating surfaces within the boiler. One of the primary operational issues facing steam sootblower systems is leakage in the sealing area. This is primarily due to their operating characteristics and design flaws in the seals: the sootblower lance moves in a uniform, spiral axial trajectory, while the steam supply pipe supplies steam to the lance in a stationary manner. Because the working medium is superheated steam, with high temperatures and pressures, the sealing materials between the steam supply pipe and the lance are constantly under complex working conditions. The original design employed a simple ring seal with a packing assembly and packing. During operation, eccentricity, radial runout, and axial displacement of the steam supply pipe or lance pipe can cause significant impact and wear on the fixed seal. Long-term operation can lead to increased seal gaps, seal failure, and leakage of high-temperature, high-pressure steam from the seal. This can cause deformation and barrel extension and jamming due to the large temperature differential between the inside and outside of the seal, posing a significant safety hazard. Therefore, it is necessary to modify the sootblower seal structure.

[0003] In order to overcome the shortcomings in the technical background, the utility model discloses a long-rod telescopic steam soot blower sealing structure, which sets the seal between the inner tube and the outer tube as a swinging sealing ring sealing structure, a large gap is left between the concave seal and the perforated annular seal and the inner tube, and a swinging sealing ring is set between the concave seal and the perforated annular seal, which not only achieves effective sealing, but also solves the problem of jamming when the outer tube is telescoped. Summary of the Invention

[0004] An improved long-rod telescopic steam soot blower sealing structure, characterized in that: the steam soot blower structure includes an outer tube 1, a liner ring 2, an inner tube 3, a concave seal 4, a swing seal ring 5, a tightening screw 6, a perforated annular seal 7, a sealing packing group 8 and a self-tightening gland 9, wherein the sealing packing group 8 is composed of multiple pieces of packing, and the number of packings can be determined according to the length of the perforated annular seal 7 and the self-tightening gland 9. The sealing packing group 8 is generally composed of packing on both sides and multiple groups of graphite packing in the middle; a liner ring 2, a concave seal 4, a swing seal ring 5, a perforated annular seal 7 and a sealing packing group 8 are arranged between the inner tube 3 and the outer tube 1; the outer tube 1, the liner ring 2, the concave seal The central axis of the inner tube 3 is completely coincident with that of the inner tube 3, the swing seal ring 5, the annular seal with holes 7, the sealing packing group 8, the self-tightening gland 9 and the inner tube 3; the concave seal 4 is provided with a concave seal fixing threaded hole 11 on the end surface where the concave seal 4 and the annular seal with holes 7 contact, with the central axis as the reference, and the annular seal fixing threaded hole 12 is provided on the end surface of the annular seal with holes 7 with the central axis as the reference, and the concave seal fixing threaded hole 11 and the annular seal fixing threaded hole 12 are matched with a tightening screw 6 to fix the concave seal 4 and the annular seal with holes 7, and the swing seal ring (5) is provided with a concave seal fixing threaded hole 11 and the annular seal fixing threaded hole 12, and the concave seal 4 and the annular seal with holes 7 are fixed. Located between the concave seal (4) and the annular seal with holes (7); the self-tightening cover 9 is composed of a movable end cover 901, a spring 902, a clamping flange 903 and a bolt 904. The end surface of the movable end cover 901 is provided with a movable end cover light hole 13 every 45 degrees along the circumference with the central axis as the reference; the end surface of the outer tube (1) facing the movable end cover 901 is provided with an outer tube screw hole 14 every 45 degrees along the circumference with the central axis as the reference; the spring 902 is located between the movable end cover 901 and the clamping flange 903 and is sleeved on the bolt 904; the end surface of the clamping flange 903 is provided with a clamping flange screw hole 15 every 45 degrees along the circumference with the central axis as the reference. ; The central axes of the liner ring 2, concave seal 4, swing sealing ring 5, annular seal with holes 7, sealing packing group 8, movable end cover 901 and clamping flange 904 coincide with the central axes of the inner tube 3 and the outer tube 1; the outer diameters of the liner ring 2, concave seal 4, annular seal with holes 7, sealing packing group 8 are equal to the inner diameter of the sealing groove of the outer tube 1, and the inner diameters of the liner ring 2, swing sealing ring 5, sealing packing group 8 are equal to the outer diameter of the inner tube 3; with the end of the inner tube 3 inserted into the outer tube 1 as the starting point to the other end of the inner tube 3, the liner ring 2, concave seal 4, swing sealing ring 5, annular seal with holes 7, sealing packing group 8, movable end cover 901 and clamping flange 903 are arranged in sequence.

[0005] The improved long-rod telescopic steam soot blower sealing structure is characterized in that: there is a clearance fit between the liner ring 2 and the inner tube 3; there is a clearance fit between the liner ring 2 and the sealing groove of the outer tube 1, that is, the outer diameter of the liner ring 2 is smaller than the inner diameter of the outer tube 1, and generally the gap between the two is greater than 4 mm.

[0006] The improved long-rod telescopic steam sootblower sealing structure is characterized in that the gap between the concave seal 4 and the perforated annular seal 7 and the inner tube 3 is greater than 2 mm; the concave seal 4 and the perforated annular seal 7 are tightly fitted with the sealing groove of the outer tube 1.

[0007] The improved long-rod telescopic steam sootblower sealing structure is characterized in that the swing sealing ring 5 and the inner tube 3 are tightly fitted, and the difference between the outer diameter of the swing sealing ring 5 and the inner diameter of the concave sealing ring 4 is greater than 4 mm.

[0008] The improved long-rod telescopic steam soot blower sealing structure is characterized in that the inner diameter of the sealing groove of the outer tube 1 is 140 mm, the outer diameter of the inner tube 3 is 80 mm, and the sealing device structure is only applicable to steam soot blowers. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0010] Figure 2 This is the assembly drawing of the movable sealing component of the utility model;

[0011] Figure 3 This is an isometric drawing of the liner ring of the utility model;

[0012] Figure 4 It is an isometric drawing of the concave seal of the utility model;

[0013] Figure 5 This is an isometric drawing of the swing seal ring of the utility model;

[0014] Figure 6 It is an isometric drawing of the annular seal with a hole of the utility model;

[0015] Figure 7 It is an isometric drawing of the tightening screw of the utility model;

[0016] Figure 8 It is an isometric drawing of the sealing packing assembly of the utility model;

[0017] Figure 9 It is an isometric drawing of the movable end cover of the utility model;

[0018] Figure 10 It is an isometric drawing of the clamping flange of the utility model;

[0019] Figure 11 It is an isometric drawing of the bolt of the utility model;

[0020] Figure 12 It is an isometric drawing of the spring of the utility model;

[0021] Figure 13It is the right side view of the outer tube of the utility model. DETAILED DESCRIPTION

[0022] The following is combined with Figures 1 to 12 The present invention is further described in detail with specific implementation methods 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.

[0023] An improved long-rod telescopic steam soot blower sealing structure, characterized in that: the steam soot blower structure includes an outer tube 1, a liner ring 2, an inner tube 3, a concave seal 4, a swinging seal ring 5, a tightening screw 6, a perforated annular seal 7, a sealing packing group 8 and a self-tightening gland 9; the inner tube 3 is stationary, the outer tube 1 rotates and telescopes along the axial direction, and a liner ring 2, a concave seal 4, a swinging seal ring 5, a perforated annular seal 7 and a sealing packing group 8 are arranged between the inner tube 3 and the outer tube 1; the concave seal 4 is provided with a concave seal every 90° along the circumferential direction on the end surface where the concave seal 4 and the perforated annular seal 4 contact, with the central axis as the reference. The sealing member fixing threaded hole 11 is provided on the end face of the annular seal 7 with the central axis as the reference, and an annular seal fixing threaded hole 12 with the central axis is provided every 90 degrees along the circumference. The concave sealing member fixing threaded hole 11 and the annular seal fixing threaded hole 12 with the central axis are matched with a tightening screw 6 to fix the concave sealing member 4 and the annular seal 7 with the central axis. The swing sealing ring (5) is located between the concave sealing member (4) and the annular seal with the central axis (7); the self-tightening cover 9 is composed of a movable end cover 901, a spring 902, a clamping flange 903 and a bolt 904. The end face of the movable end cover 901 is provided with a screw hole 12 every 45 degrees along the circumference with the central axis as the reference. °A movable end cover light hole 13 is opened; the movable end cover light hole 13 is a light hole, so that the movable end cover 901 can move in the axial direction, and the end face of the clamping flange 903 is based on the central axis and a clamping flange screw hole 15 is opened every 45° along the circumference, and the clamping flange screw hole 15 is a threaded hole; the end face of the outer tube facing the movable end cover 901 is based on the central axis and an outer tube screw hole 14 is opened every 45° along the circumference; there is a clearance fit between the liner ring 2 and the inner tube 3, and there is a clearance fit between the liner ring 2 and the outer tube 1; the clearance between the concave seal 4, the perforated annular seal 7 and the inner tube 3 is greater than 2mm, and the concave seal 4, the perforated annular seal There is a clearance fit between the seal 7 and the sealing groove of the outer tube 1; the swinging sealing ring 5 can move back and forth in the axial direction, and there is a clearance fit between the swinging sealing ring 5 and the inner tube 2; the central axes of the inner tube 3 and the outer tube 1 coincide with each other; the central axes of the liner ring 2, the concave seal 4, the swinging sealing ring 5, the perforated annular seal 7, the sealing packing group 8, the movable end cover 901 and the clamping flange 904 coincide with the central axes of the inner tube 3 and the outer tube 1; the outer diameters of the liner ring 2, the concave seal 4, the perforated annular seal 7 and the sealing packing group 8 are equal to the inner diameter of the sealing groove of the outer tube 1, and the inner diameters of the liner ring 2, the swinging sealing ring 5 and the sealing packing group 8 are equal to the outer diameter of the inner tube 3.

[0024] When implementing the improved long-rod telescopic steam soot blower sealing structure described in the present invention, the outer tube 1 is placed on the outer side of the inner tube 3 during installation. The sealing portion between the two tubes is formed by inserting one end of the inner tube 3 into the outer tube 1 as the starting point. To the other end of the inner tube 3, a liner ring 2, a concave seal 4, a swing seal ring 5, a perforated annular seal 7, a sealing packing group 8, a movable end cover 901 and a clamping flange 903 are sequentially arranged. The internal threaded holes on the concave seal 4 and the perforated annular seal 7 are aligned, and the concave seal 4 and the perforated annular seal 7 are tightly fixed with screws 6 to ensure that the swing seal ring 5 can move back and forth in the axial direction. When the soot blower starts working, When the soot blower finishes working, the outer tube 1 retracts and rotates. Due to the effect of friction resistance, the swing sealing ring 5 moves back and close to the perforated annular seal 7. The gap between the swing sealing ring 5 and the concave seal 4 becomes larger. When the leaked steam flows to the gap, the speed decreases, the kinetic energy decreases, and the pressure also decreases, so that the leakage amount is reduced. When the soot blower finishes working, the outer tube 1 retracts and rotates. Since the swing sealing ring 5 can move back and forth in the axial direction, and the gap between the concave seal 4 and the perforated annular seal 7 and the outer wall of the inner tube 10 is greater than 2mm, there is no friction between the concave seal 4 and the perforated annular seal 7 and the inner tube 10 when they start to retract, the overall friction resistance is reduced, and it is easy for the outer tube to 1 is retracted to avoid the barrel from getting stuck; the movable end cover 901 and the clamping flange 903 apply pressure to the entire sealing structure through the matching bolts 904, and the spring 902 is located between the movable end cover 901 and the clamping flange 903 and is sleeved on the bolts 904. Since the screw holes on the movable end cover 901 are light holes, the movable end cover 901 can move axially. When the steam pressure and the outer tube 1 extend and move the movable end cover 901, the spring 902 sleeved on the bolts 904 is compressed to push the movable end cover 901 forward, achieving the purpose of self-tightening; the concave seal 4, the perforated annular seal 7 and the outer tube 1 The sealing grooves are tightly fitted together; the swing sealing ring 5 and the inner tube 3 are tightly fitted together; the swing sealing ring 5 and the concave sealing member 4 are pressed tightly, and the above three ensure that steam will not leak; the difference between the outer diameter of the swing sealing ring 5 and the inner diameter of the concave sealing member 4 is greater than 4mm, the swing sealing ring 5 can move 360 ​​degrees in the radial direction together with the inner tube 3, and at the same time, the swing sealing ring 5 can move axially together with the inner tube 3, ensuring that the inner tube 3 swings within a certain range and that the gun barrel will not get stuck. The original wear of the gun barrel and the sealing ring is replaced by the wear of the swing sealing ring 5 and the concave sealing member 4, ensuring the safety of the inner and outer barrels and extending the service life of the inner and outer barrels.

[0025] Beneficial effects

[0026] The purpose of the present utility model is to provide a long-rod telescopic steam sootblower sealing structure with low cost, long service life, and low steam leakage. By modifying the sealing structure, the fixed seal is replaced with a movable swinging sealing ring. When the sootblower spray gun tube performs a spiral retraction motion, the back-and-forth movement of the swinging sealing ring can effectively reduce the leakage caused by the friction between the sealing device and the inner and outer pipes. At the same time, the back-and-forth movement characteristic of the swinging sealing ring effectively solves the problem of squeezing of the fixed seal in the long-rod spray gun tube. The gun tube will not experience problems such as telescopic jamming and steam leakage from the sealing ring. The improved long-rod telescopic steam sootblower sealing structure of the present utility model has low cost, long service life, and low steam leakage. It is easy to modify and apply in actual power plants, effectively solves the problems existing in fixed sealing structures, and has broad application prospects.

Claims

1. An improved long-rod telescopic steam sootblower sealing structure, characterized by: The steam soot blower structure comprises an outer tube (1), a liner ring (2), an inner tube (3), a concave seal (4), a swing seal ring (5), a tightening screw (6), a ring seal with a hole (7), a sealing packing group (8) and a self-tightening cover (9); a liner ring (2), a concave seal (4), a swing seal ring (5), a ring seal with a hole (7) and a sealing packing group (8) is arranged between the inner tube (3) and the outer tube (1); a central axis of the outer tube (1), the liner ring (2), the inner tube (3), the concave seal (4), the swing seal ring (5), the ring seal with a hole (7), the sealing packing group (8) and the self-tightening cover (9) is arranged. Completely overlap; the concave seal (4) is on the end face where the concave seal (4) and the annular seal with a hole (7) contact, with the central axis as the reference, and a concave seal fixing threaded hole (11) is opened every 90° along the circumference. The end face of the annular seal with a hole (7) is on the central axis as the reference, and a annular seal fixing threaded hole (12) with a hole is opened every 90° along the circumference. The concave seal fixing threaded hole (11) and the annular seal fixing threaded hole (12) with a hole are matched with a tightening screw (6) to fix the concave seal (4) and the annular seal with a hole (7). The swing seal ring (5) is located between the concave seal (4) and the annular seal with a hole. The self-tightening gland (9) is composed of a movable end cover (901), a spring (902), a clamping flange (903) and a bolt (904). The end surface of the movable end cover (901) is provided with a movable end cover light hole (13) every 45° along the circumference with the central axis as the reference; the end surface of the outer tube (1) facing the movable end cover (901) is provided with an outer tube screw hole (14) every 45° along the circumference with the central axis as the reference; the spring (902) is located between the movable end cover (901) and the clamping flange (903) and is sleeved on the bolt (904); the end surface of the clamping flange (903) is provided with a movable end cover light hole (13) every 45° along the circumference with the central axis as the reference; The invention relates to a method for manufacturing a compression flange (903) having a liner ring (2), a concave seal (4), a ring seal with a hole (7), and a sealing packing group (8) having an outer diameter equal to the inner diameter of the sealing groove of the outer tube (1); and a liner ring (2), a swing seal ring (5), and a sealing packing group (8) having an inner diameter equal to the outer diameter of the inner tube (3); and a liner ring (2), a concave seal (4), a swing seal ring (5), a ring seal with a hole (7), a sealing packing group (8), a movable end cover (901), and a compression flange (903) are sequentially arranged from one 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 improved long-rod telescopic steam sootblower sealing structure according to claim 1 is characterized in that: There is a clearance fit between the lining ring (2) and the inner tube (3); there is a clearance fit between the lining ring (2) and the sealing groove of the outer tube (1).

3. The improved long-rod telescopic steam sootblower sealing structure according to claim 1 is characterized in that: The gaps between the concave seal (4), the annular seal with holes (7) and the inner tube (3) are greater than 2 mm; and the concave seal (4), the annular seal with holes (7) and the sealing groove of the outer tube (1) are tightly matched.

4. The improved long-rod telescopic steam sootblower sealing structure according to claim 1 is characterized in that: The swing seal ring (5) and the inner tube (3) are tightly matched, and the difference between the outer diameter of the swing seal ring (5) and the inner diameter of the concave seal (4) is greater than 4 mm.

5. The improved long-rod telescopic steam sootblower sealing structure according to claim 1 is characterized by: The inner diameter of the sealing groove of the outer pipe (1) is 140 mm, the outer diameter of the inner pipe (3) is 80 mm, and the sealing structure is only applicable to steam soot blowers.

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