Metal and nonmetal composite compensation air preheater sealing device

Abstract

The utility model discloses a metal and non-metal composite compensation air preheater sealing device which at least comprises a metal thick sheet, a metal clamping sheet, a non-metal sealing sheet and a metal thin sheet. The metal thick sheet, the metal clamping sheet and the metal thin sheet are sequentially arranged in the thickness direction, the metal thick sheet and the metal clamping sheet are connected together, the metal clamping sheet is provided with at least two concave holes, the metal thin sheet is provided with at least two bosses, and the bosses on the metal thin sheet are movably matched in the concave holes of the metal clamping sheet; the non-metal sealing piece is detachably connected to the metal clamping piece between the metal thick piece and the metal thin piece, and the free end of the non-metal sealing piece exceeds the free end of the metal thick piece and the free end of the metal thin piece. Once the device is in contact with the sealing surface, the non-metal sealing sheet is in contact with the sealing surface, the metal sealing surface is almost free of abrasion, and the accident that the rotor is stuck is not easily caused; and the structure is simple and stable, the manufacturing and the maintenance are convenient, and the device can adapt to high-temperature and high-dust environments.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the sealing technical field of Ljungstrom air preheater, and relates to an air preheater sealing device with metal and nonmetal composite compensation. BACKGROUND

[0002] The Ljungstrom air preheater (hereinafter referred to as "air preheater") is a heat exchange equipment for large-scale power station boilers, which uses the heat of boiler flue gas to heat the air required for combustion. The air preheater rotor is composed of a large number of heat storage elements. When the rotor rotates slowly, the flue gas and the air flow reversely and alternately through the rotor, the heat storage elements absorb heat on the flue gas side and release heat on the air side, thereby achieving the preheating effect of reducing the flue gas temperature and increasing the hot air temperature, and improving the economic efficiency of the power plant.

[0003] The air preheater rotor is actually a huge cylinder. From cold state to hot state, due to the temperature difference between the upper and lower end faces and the weakening of the rigidity of the steel material after being heated, a "mushroom-shaped" deformation is generated. Therefore, when installed in the cold state, a gap needs to be reserved between the air preheater rotor and the stator. The size of the reserved gap depends on the deformation amount of each component of the air preheater, especially the deformation amount of the air preheater rotor. In principle, it is necessary to ensure that the rotor and the stator do not collide and grind under any working condition, so as to prevent the rotor from being stuck and causing safety accidents.

[0004] Since the air side pressure of the air preheater is higher than the flue gas side pressure, a sealing device is needed to reduce the leakage of air to the flue gas side to reduce energy loss. The conventional method in engineering is to install a sealing sheet on the rotor baffle. The sealing sheet and the rotor baffle are connected by bolts. The rotor baffle is generally long, and the shorter sealing sheet is connected end to end to form a complete seal. The traditional sealing sheet is a straight sheet type. A larger sealing gap and a smaller sealing sheet thickness need to be reserved during installation to ensure the safe and stable operation of the air preheater.

[0005] In order to adapt to the high temperature and high dust operating environment of the air preheater and facilitate production, the existing sealing sheet is all metal. Once the sealing sheet collides with the sealing surface, the sealing surface is easily permanently damaged and the rotor is easily stuck. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing an air preheater sealing device with metal and nonmetal composite compensation, which is convenient for production and maintenance, can adapt to high temperature and high dust environment, and once collides with the sealing surface, the nonmetal sealing sheet contacts the sealing surface, which almost does not cause wear to the metal sealing surface and does not easily cause the rotor to be stuck.

[0007] To solve the above technical problems, the technical scheme of the utility model is as follows:

[0008] A metal and non-metal composite compensation air preheater sealing device, comprising at least a metal thick sheet, a metal clamping sheet, a non-metal sealing sheet and a metal thin sheet;

[0009] The metal thick sheet, the metal clamping sheet and the metal thin sheet are sequentially arranged along the thickness direction, the metal thick sheet and the metal clamping sheet are connected together, at least two recessed holes are arranged on the metal clamping sheet, and at least two protrusions are arranged on the metal thin sheet, the protrusions on the metal thin sheet are movably matched in the recessed holes of the metal clamping sheet.

[0010] The non-metal sealing sheet is movably connected on the metal clamping sheet between the metal thick sheet and the metal thin sheet, and the free end of the non-metal sealing sheet exceeds the free end of the metal thick sheet and the free end of the metal thin sheet.

[0011] The metal thick sheet, the metal clamping sheet, the non-metal sealing sheet and the metal thin sheet are all in the shape of a long strip. One end of the metal thick sheet, the metal clamping sheet, the non-metal sealing sheet and the metal thin sheet in the width direction is the mounting end (or the connecting end), and the other end is the free end. The mounting end of the metal thick sheet, the metal clamping sheet and the metal thin sheet is provided with a corresponding waist-shaped mounting hole, and is mounted on the air preheater rotor radial baffle through a mounting bolt passing through the waist-shaped mounting holes of the three, and the mounting end of the non-metal sealing sheet is movably connected on the free end of the metal clamping sheet along the length direction, and the free end of the non-metal sealing sheet exceeds the free end of the metal thick sheet and the free end of the metal thin sheet.

[0012] In use, once colliding with the sealing surface, since the free end of the non-metal sealing sheet exceeds the free ends of the metal thick sheet and the metal thin sheet, the non-metal sealing sheet contacts the sealing surface, and almost no wear is caused to the metal sealing surface, and the rotor is not easily stuck.

[0013] The metal thick sheet and the metal thin sheet play the role of supporting and strengthening the sealing. The metal clamping sheet is used for supporting and connecting the non-metal sealing sheet. The non-metal sealing sheet is movably connected on the metal clamping sheet, and when the non-metal sealing sheet needs to be replaced due to large wear, only the non-metal sealing sheet needs to be replaced, and the metal thick sheet, the metal clamping sheet and the metal thin sheet can be recycled.

[0014] The recessed holes and the protrusions are matched to relatively fix the positions of the metal thick sheet and the metal thin sheet.

[0015] In order to ensure the stability of the connection of the non-metal sealing sheet and the metal clamping sheet and the convenience of disassembly, as one of the specific preferred schemes, the metal clamping sheet and the non-metal sealing sheet are movably embedded into one body in the dovetail groove structure matching with each other. For example, the dovetail groove is arranged on the metal clamping sheet along the length direction, the dovetail protrusion matching with the dovetail groove is arranged on the non-metal sealing sheet along the length direction, and then the dovetail protrusion on the non-metal sealing sheet and the dovetail groove on the metal clamping sheet are movably matched together, which is simple and stable.

[0016] In order to ensure the service life of the sealing device, the material of the non-metallic sealing sheet is preferably polytetrafluoroethylene with a temperature resistance of not less than 260 DEG C. In this way, even if the metal sealing surface is abraded, the rotor is hardly locked, and the abrasion rate of the non-metallic sealing sheet is greatly reduced.

[0017] In order to balance stability and sealing, the height of the boss is 2-5 mm; the depth of the recess is 2-5 mm; the height of the boss is not greater than the depth of the recess.

[0018] In order to facilitate assembly, the recess is preferably a waist-shaped hole, and the length direction of the recess (waist-shaped hole) is consistent with the length direction of the metal clamping sheet; the boss is preferably a circular boss.

[0019] The length directions of the metal thick sheet, the metal clamping sheet, the non-metallic sealing sheet and the metal thin sheet are consistent, and are consistent with the radial direction of the rotor.

[0020] In order to facilitate installation, the width of the recess is 0.2-1 mm greater than the diameter of the boss, and the length of the recess is 2-10 mm greater than the diameter of the boss.

[0021] The number of bosses on the metal thin sheet is not greater than the number of recesses on the metal clamping sheet, so that the bosses on the metal thin sheet can be matched in the recesses on the metal clamping sheet during installation, and preferably, the number of bosses on the metal thin sheet is equal to the number of recesses on the metal clamping sheet and one-to-one correspondence.

[0022] In order to ensure the stability of use, the boss is welded on the metal thin sheet.

[0023] The recess is a through hole or a blind hole.

[0024] In order to improve the stability of the device, the metal clamping sheet and the metal thick sheet are welded as a whole.

[0025] In order to balance sealing and stability, the free end of the non-metallic sealing sheet is 2-5 mm longer than the free end of the metal thin sheet, and the free end of the non-metallic sealing sheet is 5-10 mm longer than the free end of the metal thick sheet; the free ends of the metal thick sheet, the metal thin sheet and the non-metallic sealing sheet are all bent, the free ends of the metal thin sheet and the non-metallic sealing sheet are attached together; the free ends of the non-metallic sealing sheet and the metal thick sheet are provided with an included angle of 10-20 DEG.

[0026] As a specific implementation scheme, one end of the metal thick sheet and the metal thin sheet in the width direction is a mounting end, and the other end is a free end, the metal clamp sheet is located between the metal thick sheet and the metal thin sheet, and is arranged along the length direction of the metal thick sheet and the metal thin sheet and located at the mounting end of the metal thick sheet and the metal thin sheet; the mounting end of the non-metal sealing sheet is detachably connected to the free end of the metal clamp sheet through the dovetail groove structure in the length direction, and the free end of the non-metal sealing sheet exceeds the free end of the metal thick sheet and the metal thin sheet, that is, the non-metal sealing sheet is also located between the metal thick sheet and the metal thin sheet, and the free end of the non-metal sealing sheet exceeds the free end of the metal thick sheet and the free end of the metal thin sheet; the mounting end of the metal thick sheet, the mounting end of the metal thin sheet and the metal clamp sheet are all provided with a waist-shaped mounting hole, and the metal thick sheet, the metal clamp sheet and the metal thin sheet are mounted on the air preheater rotor radial baffle through the mounting bolt penetrating through the waist-shaped mounting holes of the three.

[0027] The technologies not mentioned in the utility model are prior art.

[0028] The metal and non-metal composite compensation air preheater sealing device has the advantages that once colliding and grinding with the sealing surface, the non-metal sealing sheet contacts the sealing surface, the metal sealing surface is almost not worn, and the rotor is not easy to be stuck; the structure is simple, stable, convenient to manufacture and maintain, and can adapt to high-temperature and high-dust environment; when the non-metal sealing sheet needs to be replaced due to large wear, only the non-metal sealing sheet needs to be replaced, and the metal thick sheet, the metal clamp sheet and the metal thin sheet can be recycled. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a front view of the metal and non-metal composite compensation air preheater sealing device of the utility model;

[0030] Figure 2 It is an explosion view (partly exploded) of the metal and non-metal composite compensation air preheater sealing device of the utility model;

[0031] Figure 3 It is Figure 1 The left view (relative Figure 1 Enlargement);

[0032] Figure 4 It is a structural schematic view of the metal thin sheet of the utility model.

[0033] In the figure, 1 is a metal thick sheet, 2 is a metal clamp sheet, 2-1 is a recessed hole, 3 is a non-metal sealing sheet, 4 is a metal thin sheet, 4-1 is a boss, 5 is a pressing plate, and 6 is a fastener group. DETAILED DESCRIPTION

[0034] The utility model will be specifically introduced below in combination with specific embodiments.

[0035] Example 1

[0036] like Figures 1-3 As shown, an air preheater sealing device with metal and non-metal composite compensation includes a thick metal sheet, a metal clip, a non-metal sealing sheet, and a thin metal sheet.

[0037] Thick metal sheets, metal clips, and thin metal sheets are arranged sequentially along the thickness direction; that is, the metal clips are located between the thick metal sheets and the thin metal sheets. The thick metal sheets and the metal clips are welded together along the length direction, such as... Figure 2 As shown, the metal clip has at least two recessed holes, such as... Figure 4 As shown, at least two protrusions are provided on the metal sheet, and the protrusions on the metal sheet are movably fitted into the recesses of the metal clip.

[0038] The thick metal sheet, metal clip, non-metallic sealing sheet, and thin metal sheet each have an mounting end at one end and a free end along their width. The metal clip is positioned along the length of the thick and thin metal sheets and located at their mounting ends. The mounting end of the non-metallic sealing sheet is detachably connected to the free end of the metal clip via a dovetail groove structure along its length (e.g., ...). Figure 1 As shown, a dovetail groove is provided along the length direction at the free end of the metal clip, and a dovetail protrusion matching the dovetail groove is provided along the length direction at the mounting end of the non-metallic sealing sheet. Then, the dovetail protrusion on the non-metallic sealing sheet and the dovetail groove on the metal clip are movably engaged together (which is both simple and stable), and the free end of the non-metallic sealing sheet extends beyond the free end of the thick metal sheet and the free end of the thin metal sheet.

[0039] The mounting ends of the thick metal sheet, the thin metal sheet, and the metal clip are all provided with waist-shaped mounting holes, and are mounted on the radial partition of the air preheater rotor by mounting bolts that pass through the waist-shaped mounting holes of the three parts simultaneously. The thick metal sheet is in contact with the radial partition of the air preheater rotor, and a pressure plate is pressed on the thin metal sheet.

[0040] When in use, once it comes into contact with the sealing surface, because the free end of the non-metallic sealing sheet extends beyond the free end of the thick and thin metal sheets, the non-metallic sealing sheet comes into contact with the sealing surface, which will hardly cause wear to the metal sealing surface and is not likely to cause rotor jamming.

[0041] The aforementioned thick and thin metal sheets serve to support and reinforce the seal. Metal clips are used to support and connect the non-metallic sealing sheets. The non-metallic sealing sheets are detachably connected to the metal clips; when the non-metallic sealing sheets show significant wear and need replacement, only the non-metallic sealing sheets need to be replaced, and the thick, thin, and thick metal sheets can be recycled.

[0042] Example 2

[0043] On the basis of Embodiment 1, the following improvements are further made: In order to ensure the service life of the sealing device, the material of the non-metallic sealing sheet is polytetrafluoroethylene with a temperature resistance of not less than 260℃.

[0044] Embodiment 3

[0045] On the basis of Embodiment 2, the following improvements are further made: In order to facilitate assembly, the recess hole is a waist-shaped hole, and the length direction of the recess hole is consistent with the length direction of the metal clamping sheet; the boss is a circular table. The width of the recess hole is 0.2mm larger than the diameter of the boss (it has been verified that it can also be 0.5mm, 0.8mm, etc.), and the length of the recess hole is 5mm larger than the diameter of the boss (it has been verified that it can also be 2mm, 8mm, etc.). The metal thick sheet is 3mm, the metal clamping sheet is 3mm, the non-metallic sealing sheet is 3mm, the metal thin sheet is 1.5mm, and the pressing plate is 5mm. The height of the boss is 2mm (it has been verified that it can also be 2.2mm, 2.4mm, etc.); the depth of the recess hole is 2.1mm (it has been verified that it can also be 2.3mm, 2.5mm, etc.), and the recess hole is a blind hole.

[0046] Embodiment 4

[0047] On the basis of Embodiment 3, the following improvements are further made: The number of bosses on the metal thin sheet is equal to and one-to-one corresponds to the number of recess holes on the metal clamping sheet. In order to ensure the stability of use, the bosses are welded on the metal thin sheet.

[0048] Embodiment 5

[0049] On the basis of Embodiment 4, the following improvements are further made: In order to balance the sealing performance and stability, the free end of the non-metallic sealing sheet is 2mm longer than the free end of the metal thin sheet, and the free end of the non-metallic sealing sheet is 5mm longer than the free end of the metal thick sheet; the free ends of the metal thick sheet, the metal thin sheet and the non-metallic sealing sheet are all bent, and the three are bent in the same direction, the free ends of the metal thin sheet and the non-metallic sealing sheet are attached together, the angle between the metal thick sheet and the vertical direction is 35°, the angle between the metal thin sheet and the non-metallic sealing sheet and the vertical direction is 15°, and the angle between the free ends of the non-metallic sealing sheet and the metal thick sheet is 20°.

[0050] The above-mentioned metal and non-metal composite compensation sealing device of the air preheater has the following advantages: once it collides with the sealing surface, the non-metallic sealing sheet contacts the sealing surface, and the metal sealing surface is almost not worn, and the rotor is not easy to be stuck; the structure is simple, stable, easy to manufacture and maintain, and can adapt to high-temperature and high-dust environments; once the non-metallic sealing sheet needs to be replaced due to large wear, only the non-metallic sealing sheet needs to be replaced, and the metal thick sheet, the metal clamping sheet and the metal thin sheet can be recycled.

[0051] The above embodiments do not limit the utility model in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the utility model.

Claims

1. A metallic and non-metallic composite compensating air preheater seal apparatus, characterized by: The metal thick sheet (1), the metal clamping sheet (2), the nonmetal sealing sheet (3) and the metal thin sheet (4) are sequentially arranged along the thickness direction, the metal thick sheet (1) and the metal clamping sheet (2) are connected together, at least two recess holes (2-1) are arranged on the metal clamping sheet (2), and at least two convex bosses (4-1) are arranged on the metal thin sheet (4), the convex bosses (4-1) on the metal thin sheet (4) are movably matched in the recess holes (2-1) of the metal clamping sheet (2). The nonmetal sealing sheet (3) is movably connected on the metal clamping sheet (2) between the metal thick sheet (1) and the metal thin sheet (4), and the free end of the nonmetal sealing sheet (3) exceeds the free end of the metal thick sheet (1) and the free end of the metal thin sheet (4). The metal clamping sheet (2) and the nonmetal sealing sheet (3) are movably embedded into one body in a dovetail groove structure.

2. The metallic to non-metallic composite-compensated air preheater seal apparatus of claim 1, wherein: The material of the nonmetal sealing sheet (3) is polytetrafluoroethylene with a temperature resistance of not less than 260 DEG C.

3. The metallic-to-nonmetallic composite-compensated air preheater seal apparatus of claim 1 or 2, wherein: The height of the convex boss (4-1) is 2-5 mm, the depth of the recess hole (2-1) is 2-5 mm, and the height of the convex boss (4-1) is not greater than the recess depth of the recess hole (2-1).

4. The metallic-to-nonmetallic composite-compensated air preheater seal apparatus of claim 1 or 2, wherein: The recess hole (2-1) is a waist-shaped hole, the length direction of the recess hole (2-1) is consistent with the length direction of the metal clamping sheet (2), and the convex boss (4-1) is a circular boss.

5. The metallic-to-nonmetallic composite-compensated air preheater seal apparatus of claims 1 or 2, wherein: The width of the recess hole (2-1) is 0.2-1 mm larger than the diameter of the convex boss (4-1), and the length of the recess hole (2-1) is 2-10 mm larger than the diameter of the convex boss (4-1).

6. The metallic to non-metallic composite-compensated air preheater seal apparatus of claim 5, wherein: The number of the convex bosses (4-1) on the metal thin sheet (4) is equal to and corresponds to the number of the recess holes (2-1) on the metal clamping sheet (2), the convex bosses (4-1) are welded on the metal thin sheet (4), and the recess holes (2-1) are through holes or blind holes.

7. The metallic-to-nonmetallic composite-compensated air preheater seal apparatus of claims 1 or 2, wherein: The metal clamping sheet (2) and the metal thick sheet (1) are welded into one body.

8. The metallic-to-nonmetallic composite-compensated air preheater seal apparatus of claims 1 or 2, wherein: The free end of the nonmetal sealing sheet (3) exceeds the free end of the metal thin sheet (4) by 2-5 mm, and the free end of the nonmetal sealing sheet (3) exceeds the free end of the metal thick sheet (1) by 5-10 mm, the free ends of the metal thick sheet (1), the metal thin sheet (4) and the nonmetal sealing sheet (3) are all bent, the free ends of the metal thin sheet (4) and the nonmetal sealing sheet (3) are pasted together, and the free ends of the nonmetal sealing sheet (3) and the metal thick sheet (1) are provided with an included angle of 10-20 DEG.

9. The metallic-to-nonmetallic composite-compensated air preheater seal apparatus of claims 1 or 2, wherein: ​ 10. The metallic-to-nonmetallic composite-compensated air preheater seal apparatus of claims 1 or 2, wherein: The metal thick sheet (1), the metal clamping sheet (2), the non-metal sealing sheet (3) and the metal thin sheet (4) have one end as a mounting end and the other end as a free end in the width direction, the metal clamping sheet (2) is located between the metal thick sheet (1) and the metal thin sheet (4), the metal clamping sheet (2) is arranged along the length direction of the metal thick sheet (1) and the metal thin sheet (4) and is located at the mounting end of the metal thick sheet (1) and the metal thin sheet (4), the mounting end of the non-metal sealing sheet (3) is detachably connected to the free end of the metal clamping sheet (2) through a dovetail groove structure in the length direction, and the free end of the non-metal sealing sheet (3) exceeds the free end of the metal thick sheet (1) and the free end of the metal thin sheet (4), the mounting end of the metal thick sheet (1), the mounting end of the metal thin sheet (4) and the metal clamping sheet (2) are all provided with a waist-shaped mounting hole, and are mounted on the radial baffle of the air preheater rotor through mounting bolts which pass through the waist-shaped mounting holes of the three.

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