Radial sealing device of rotary air preheater

Abstract

A radial sealing device of a rotary air preheater comprises an adjusting plate and a swing plate which are in butt joint end to end respectively, the adjusting plate and the swing plate are hinged through a hinge shaft, a rolling shaft is assembled at the upper end of the swing plate, and a spring seat plate and a double-lug plate are arranged on the back face of the adjusting plate and the back face of the swing plate in an up-down corresponding mode. A pull rod penetrates through a long hole in the spring seat plate, the upper end of the pull rod is hinged to the double-lug plate through a pin shaft, and an upper spring and a lower spring which are arranged on the pull rod in a sleeving mode are arranged above and below the spring seat plate respectively. A lap joint sealing plate is arranged behind the head end of the adjusting plate; and two layers of transversely-arranged lap joint elastic battens are vertically arranged behind the head end of the swing plate, and butt joints of the two layers of lap joint elastic battens are arranged in a staggered mode. According to the air preheater, the working performance of the swing plate and the supporting spring is improved, the operation stability of the rotor can be ensured, the sealing effect of the air preheater can be remarkably improved, and the efficiency of the air preheater is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to rotary air preheater sealing device, concretely relates to a kind of rotary air preheater radial sealing device. BACKGROUND

[0002] Rotary air preheater is important energy-saving equipment of power plant boiler flue gas recycling, and its sealing performance directly influences the efficiency of boiler.The prior art uses swing plate and adjusting plate hinged connection of assembly roller and utilizes spring to support swing plate to constitute sealing assembly, and rotary air preheater rolling type flexible radial sealing device is formed by the butt joint of multiple sealing assemblies, which can ensure that sealing device and rotary air preheater fan-shaped plate form effective cooperation gap, and solve the friction and wear problem of sealing device and fan-shaped plate, but it has the following problems:1) one-way spring support structure will make swing plate vibrate in the process of swinging, affect the stability of rotor operation, and when rotor reversely rotates (for example equipment maintenance), swing plate will lack necessary support, and spring will also be affected by overstrong tension and lateral force, so as to affect the working performance of support spring;2) since rotor of rotary air preheater will produce mushroom type deformation in working process, radial gap is caused at the butt joint of adjusting plate and swing plate, and since the contact inconsistency of arranged roller and fan-shaped plate, circumferential gap is also caused at the butt joint of swing plate, so as to cause sealing device to leak air, seriously affect the sealing performance of sealing device. SUMMARY

[0003] The utility model aims at the above problem, provide a kind of rotary air preheater radial sealing device, to improve the working performance of swing plate and support spring, improve the stability of rotor operation, enhance the sealing effect of air preheater, improve the operating performance and efficiency of air preheater.

[0004] The technical scheme for realizing the above object is: a radial sealing device of a rotary air preheater, comprising abutting adjustment plates and swing plates at the head and tail ends, the adjustment plates and swing plates are hingedly connected through hinge shafts arranged at the head and tail ends, the adjustment plates are provided with mounting bolt holes, the swing plates are provided with rollers at the upper ends of the head and tail ends, the adjustment plates are provided with flat spring seat plates at the rear of the head and tail ends, the swing plates are provided with double lug plates corresponding to the spring seat plates, pull rods pass through long holes in the spring seat plates and are hingedly connected to the double lug plates through pins at the upper ends, the lower ends of the pull rods are provided with adjusting nuts, upper springs are sleeved on the pull rods between the double lug plates and the spring seat plates, and lower springs are sleeved on the pull rods between the spring seat plates and the adjusting nuts; a lap sealing plate is arranged at the rear of the head end of the adjustment plate; vertically arranged transverse lap elastic strip plates are arranged at the rear of the head end of the swing plate, the lap elastic strip plates are provided with two layers, and the abutting seams of the two layers of lap elastic strip plates are arranged staggeredly.

[0005] The radial sealing device of the rotary air preheater, the upper end section of the swing plate is in the shape of a circular arc, the center of the circular arc is concentric with the roller, and the outer diameter of the circular arc is 0.2mm-0.3mm smaller than the outer diameter of the roller; the middle part of the lower end of the swing plate is in the shape of a circular arc, and the center of the circular arc is concentric with the hinge shaft.

[0006] The radial sealing device of the rotary air preheater, the upper surface and the lower surface of the spring seat plate are provided with adjusting washers.

[0007] The radial sealing device of the rotary air preheater, the roller is provided with a bearing.

[0008] The upper and lower spring supporting structure can avoid vibration of the swing plate during operation, improve the stability of the rotor during operation, and improve the working performance of the supporting spring.

[0009] The lap sealing plate is arranged at the abutting position of the adjustment plate, and the lap elastic strip plate is arranged at the abutting position of the swing plate, so that the problem of air leakage of the sealing device caused by deformation of the rotor and inconsistent contact between the roller and the sector plate is solved, and the working efficiency of the air preheater is effectively improved.

[0010] The upper and lower end sections of the swing plate are designed in the shape of a circular arc, so that effective sealing is formed during swinging of the swing plate, and the rigidity and strength of the swing plate are improved.

[0011] The upper surface and the lower surface of the spring seat plate are provided with adjusting washers, so that the angle of the swing plate can be adjusted conveniently.

[0012] The rolling shaft assembly bearing is beneficial to improving the flexible performance of the rolling shaft rotation. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is the main view structural schematic diagram of the radial sealing device of the rotary air preheater.

[0014] Figure 2 is Figure 1 the right view structural schematic diagram.

[0015] In the figure: 1, adjusting plate; 2, swing plate; 3, hinge shaft; 4, bolt hole; 5, rolling shaft; 6, spring seat plate; 7, double lug plate; 8, pull rod; 9, pin shaft; 10, adjusting nut; 11, upper spring; 12, lower spring; 13, lapping sealing plate; 14, lapping elastic strip plate; 15, adjusting washer; 16, bearing. DETAILED DESCRIPTION

[0016] The utility model will be made further detailed explanation in combination with the drawings.

[0017] For example Figure 1 , Figure 2The radial sealing device of the rotary air preheater comprises six or eight abutting adjustment plates 1 and swing plates 2, each adjustment plate 1 is vertically connected to the upper end of the warehouse partition plate of the rotor of the rotary air preheater through the vertically long circular bolt holes 4 arranged on the adjustment plate 1, each swing plate 2 is hingedly connected to the upper end of the adjustment plate 1 through the hinge shaft 3 arranged at the rear end of the swing plate 2, the upper end of the swing plate 2 is equipped with the roller shaft 5 in contact with the inner side of the sector plate of the rotary air preheater, and each roller shaft 5 is assembled through a pair of shaft sleeves fixed on the rear end of the adjustment plate 1. A spring seat plate 6 is fixedly arranged at the rear end of each adjustment plate 1, the spring seat plate 6 is horizontally arranged and has a long circular hole, a double lug plate 7 corresponding to the spring seat plate 6 is fixedly arranged at the rear end of the swing plate 2, a pull rod 8 penetrates through the long circular hole of the spring seat plate 6 and is hingedly connected to the double lug plate 7 through a horizontally arranged pin shaft 9, an adjusting nut 10 is assembled at the lower end of the pull rod 8, and the adjusting nut 10 can be a double nut for preventing loosening. An upper spring 11 is sleeved on the pull rod 8 between the double lug plate 7 and the spring seat plate 6, and a lower spring 12 is sleeved on the pull rod 8 between the spring seat plate 6 and the adjusting nut 10. A lap sealing plate 13 is arranged at the rear end of the front end of the adjustment plate 1, the lap sealing plate 13 is lap-welded at the rear end of the front end of the adjustment plate 1, and the lap sealing plate 13 protrudes from the front end of the adjustment plate 1 by 8mm-10mm. A vertically arranged horizontally lap elastic strip plate 14 is arranged at the rear end of the front end of the swing plate 2, the horizontally lap elastic strip plate 14 is arranged in two layers, the joint seams of the two layers of the horizontally lap elastic strip plate 14 are arranged staggered, the horizontally lap elastic strip plate 14 is made of a GH4169 material thin plate with a thickness of 0.25mm-0.35mm and a width of 5mm-6mm, the horizontally lap elastic strip plate 14 is horizontally arranged from bottom to top and is lap-welded at the rear end of the swing plate 2, the gap between the horizontally lap elastic strip plates 14 in the same layer is 0.05mm-0.15mm, and the horizontally lap elastic strip plate 14 protrudes from the front end of the swing plate 2 by 10mm-15mm.

[0018] As shown in the drawings, the upper end section of the swing plate 2 of the radial sealing device of the rotary air preheater is arranged in a circular arc shape, the center of the circular arc is concentric with the roller shaft 5, and the outer diameter of the circular arc is smaller than the outer diameter of the roller shaft 5 by 0.2mm-0.3mm, the middle section of the lower end of the swing plate 2 is arranged in a circular arc shape, and the center of the circular arc is concentric with the hinge shaft 3, and the circular arc design of the upper and lower ends of the swing plate 2 can ensure that the circular arc surface and the sealing position keep a small gap unchanged when the swing plate swings.

[0019] As shown in the drawings, adjustment washers 15 are arranged on the upper surface and the lower surface of the spring seat plate 6, and the thickness of the adjustment washers 15 can be selected to conveniently adjust the angle of the swing plate.

[0020] As shown in the drawings, the roller 5 of the radial sealing device of the present rotary air preheater is equipped with a bearing 16 to improve the flexibility of the rotation of the roller 5, and a chamfer is arranged at the contact position between the shaft of the roller 5 and the sleeve to avoid dust accumulation.

[0021] The radial sealing device of the present rotary air preheater is installed on the upper end of the partition plate of the rotor chamber of the rotary air preheater to form an upper end radial sealing device of the rotary air preheater, and is installed on the lower end of the partition plate of the rotor chamber of the rotary air preheater to form a lower end radial sealing device of the rotary air preheater.

Claims

1. A rotary air preheater radial sealing device, comprising a head-to-tail abutting adjusting plate (1) and swing plate (2), the adjusting plate (1) and swing plate (2) are hinged through the hinge shaft (3) respectively arranged at the head and tail ends, the adjusting plate (1) is arranged with mounting bolt holes (4), and the swing plate (2) is arranged with roller shafts (5) at the head and tail ends of the upper end, characterized in that The rear face of the adjusting plate (1) is provided with flat spring seat plates (6) at both ends thereof, the rear face of the swing plate (2) is provided with double lug plates (7) corresponding to the spring seat plates (6) respectively, a pull rod (8) penetrates through the long holes in the spring seat plates (6) and is hingedly connected to the double lug plates (7) through a pin shaft (9) at the upper end thereof, the lower end of the pull rod (8) is provided with an adjusting nut (10), an upper spring (11) is sleeved on the pull rod (8) between the double lug plates (7) and the spring seat plates (6), and a lower spring (12) is sleeved on the pull rod (8) between the spring seat plates (6) and the adjusting nut (10); a lap sealing plate (13) is arranged at the rear face of the front end of the adjusting plate (1); a vertical arrangement of transverse lap elastic strip plates (14) is arranged at the rear face of the front end of the swing plate (2), the lap elastic strip plates (14) are arranged in two layers, and the joint seams of the two layers of lap elastic strip plates (14) are arranged staggered.

2. The rotary air preheater radial seal apparatus of claim 1, wherein: The upper end section of the swing plate (2) is in the shape of a circular arc, the center of the circular arc is concentric with the roll shaft (5), and the outer diameter of the circular arc is 0.2-0.3mm smaller than the outer diameter of the roll shaft (5); the middle section of the lower end of the swing plate (2) is in the shape of a circular arc, and the center of the circular arc is concentric with the hinge shaft (3).

3. The rotary air preheater radial seal apparatus of claim 1, wherein: Adjusting washers (15) are arranged on the upper and lower faces of the spring seat plates (6).

4. The rotary air preheater radial seal apparatus as set forth in claim 1, wherein: The roll shaft (5) is provided with a bearing (16).

Images