CN215674207U

CN215674207U - Novel single tube expansion compensator

Info

Publication number: CN215674207U
Application number: CN202122104399.6U
Authority: CN
Inventors: 朱紫龙; 吕宏霞
Original assignee: Doright Co ltd
Current assignee: Doright Co ltd
Priority date: 2021-09-02
Filing date: 2021-09-02
Publication date: 2022-01-28
Anticipated expiration: 2031-09-02

Abstract

The utility model discloses a novel single-tube expansion compensator, which comprises: the short pipe, the small corrugated pipe, the large corrugated pipe, the lining pipe, the packing box, the packing gland, the pretensioning fixing plate, the protective sleeve and the protective sleeve baffle. Through the improvement of the corrugated pipe structure, the welding joint and the sealing mode of the single-pipe expansion compensator and the protection measures adopted for the corrugated pipe of the compensator, the problems that the corrugations at two ends of the corrugated pipe of the compensator are broken or the welding seams are cracked, the sealing is not tight, the corrugated pipe is impacted by cold air and the like are solved. The improved compensator does not need to invest excessive funds, but has great benefit, thereby not only reducing the maintenance cost, but also reducing the downtime and saving a large amount of field maintenance cost for customers.

Description

Novel single tube expansion compensator

Technical Field

The utility model relates to a vertical shell-and-tube air preheater heat exchange tube single-tube expansion compensator (hereinafter referred to as compensator).

Background

For years, the high-temperature carbon black flue gas enters a tube side and low-temperature air enters a shell side to exchange heat to heat cold air in the working process of the air preheater used for carbon black production, and expansion difference generated between the tube side and the shell side is absorbed by a compensator on a heat exchange tube. At present, the damage form of the compensator is mainly that cracks occur at two ends of the corrugated pipe close to a welding seam, and analysis shows that: 1. the part is a lapped fillet weld, the outer wall of the short pipe butted with the part is a non-processing surface, so that the lapped gap between the corrugated pipe and the short pipe is not uniform, and the corrugation is stressed unevenly to generate cracks. 2. Carbon black smoke enters between the corrugated pipe and the lining pipe, accumulated carbon black particles are accumulated in the corrugations, so that the corrugated pipe cannot be compressed to meet the design requirement, and cracks are generated under the action of extrusion force. 3. The compensator is directly impacted by cold air, the inside of the compensator is radiated by high-temperature flue gas in the heat exchange tube, and the corrugated pipe is distorted and deformed due to uneven stress. Therefore, a novel single-tube expansion compensator is provided, which can effectively solve the problems.

Disclosure of Invention

The utility model aims to design a novel single-tube expansion compensator, which adopts the technical scheme that:

a novel single tube expansion compensator comprising: nozzle stub 1, little bellows 2, big bellows 3, interior bushing 4, packing 5, packing box 6, packing gland 7 prestretch fixed plate 8, protective case 9, protective sheath baffle 10, its characterized in that: the compensator corrugated pipe consists of a large corrugated pipe (3), a small corrugated pipe (2) and a short pipe (1), namely, the two ends connected with the short pipe (1) adopt a section of small corrugated pipe (2) with stronger rigidity, and the middle part adopts the large corrugated pipe (3) with larger compensation amount; the welding seam of the short pipe (1) and the small corrugated pipe (2) adopts a butt joint structure, namely a platform with a groove is processed at the welding position of the short pipe (1) and the small corrugated pipe (2); the inner lining pipe (4) and the corrugated pipe are sealed by adopting a packing (5), namely a packing box (6) is welded on the short pipe (1), and the packing (5) is compacted by a packing gland (7) and then welded on the packing box (6); the compensator is sleeved with a protective sleeve (9) with a plurality of holes at the lower part, the protective sleeve (9) prevents cold air from directly impacting the corrugated pipe and the corrugated pipe to be influenced by the high temperature of radiation of the heat exchange pipe, three protective sleeve baffles (10) are uniformly distributed at the lower end of the short pipe (1), and the protective sleeve (9) is ensured not to collide with the corrugated pipe. The improved structure effectively solves the problems that the ripples at the two ends of the corrugated pipe of the compensator are broken or the welding line is cracked, the sealing is not tight, the corrugated pipe is impacted by cold air, and the like.

The design key points and advantages of the utility model are as follows:

1. the rigidity and the strength of the corrugated pipe are increased, namely, a section of small corrugated pipe (2) is adopted at the two ends of the corrugated pipe, so that the strength of the corrugation at the position is improved;

2. a platform with a groove is processed at the welding position of the short pipe (1) and the small corrugated pipe (2), the welding seam is changed from the original fillet weld to a butt welding seam, the gap between the small corrugated pipe (2) and the short pipe (1) is reduced, the welding seam strength is enhanced, and the service life of the compensator is prolonged.

3. A packing box (6) is connected to the short pipe (1) at the upper end of the corrugated pipe and is pressed by a packing gland (7) after being filled with a packing (5) and is welded on the packing box (6), three protective sleeve baffles (10) are uniformly distributed on the short pipe (1) at the lower end, and therefore carbon black smoke is prevented from entering the corrugated pipe and the protective sleeve (9) cannot touch the corrugated pipe;

4. the compensator is provided with a protective sleeve (9), the protective sleeve (9) is provided with a plurality of holes and is welded on the tube plate, and a packing box (6) on the compensator is welded on the protective sleeve (9) to prevent cold air from directly blowing on the corrugated pipe and prevent the gathered heat from being emitted from the holes on the protective sleeve (9);

5. the improved compensator does not need to invest excessive funds, but has great benefit, thereby not only reducing the maintenance cost, but also reducing the downtime and saving a large amount of field maintenance cost for customers.

Drawings

FIG. 1 schematic diagram of a compensator of the present invention

FIG. 2 is a top view of FIG. 1

FIG. 3 is a bottom view of FIG. 1

The labels in the figure are: 1-short pipe, 2-small corrugated pipe, 3-large corrugated pipe, 4-lining pipe, 5-packing, 6-packing box,

7-packing gland, 8-pretension fixing plate, 9-protective sleeve and 10-protective sleeve baffle.

Detailed Description

A novel single tube expansion compensator comprising: the short pipe 1, the small corrugated pipe 2, the large corrugated pipe 3, the lining pipe 4, the packing 5, the packing box 6, the packing gland 7, the pretensioning fixing plate 8, the protective sleeve 9 and the protective sleeve baffle 10.

The specific implementation process comprises the following steps:

1. processing an annular table welded by the short pipe 1 and the small corrugated pipe 2, wherein the depth of the annular table is equal to the thickness of the corrugated pipe and is chamfered;

2. assembling and welding the small corrugated pipe 2, the large corrugated pipe 3 and the short pipe 1 to form a compensator corrugated pipe;

3. the upper end of the short bellows pipe 1 is welded with the packing box 6, the lower end is welded with the inner lining pipe 4, and three protective sleeve baffles 10 are uniformly welded;

4. the packing box 6 is filled with the packing 5, compacted by the packing gland 7 and then welded with the packing box 6, and three pre-tensioning fixing plates 8 which are uniformly distributed are welded on the packing gland 7;

5. three pre-stretching fixing plates 8 are used for stretching the corrugated pipe to the size required by the design and then are welded on the lining pipe 4, so that the corrugated pipe is in a pre-stretching state;

6. when the packing box is assembled with an air preheater, the protective sleeve 9 is welded with the tube plate, the lining tube 4 is welded with the heat exchange tube, and the packing box 6 is welded with the protective sleeve 9;

7. after the assembly and the assembly welding are finished, three pre-tensioning fixing plates 8 are removed;

8. when the heat exchange tube expands, the lining tube 4 and the short tube 1 at the lower end of the corrugated tube are driven to generate a compression force on the corrugations, so that the corrugated tube is kept in a pre-stretched state before installation.

Claims

1. A novel single tube expansion compensator comprising: nozzle stub (1), little bellows (2), big bellows (3), interior bushing (4), packing (5), packing box (6), packing gland (7), prestretch fixed plate (8), protective case (9), protective case baffle (10), its characterized in that: the compensator corrugated pipe consists of a large corrugated pipe (3), a small corrugated pipe (2) and a short pipe (1); the welding seam of the short pipe (1) and the small corrugated pipe (2) adopts a butt joint structure; a packing (5) is adopted to seal the lining pipe (4) and the corrugated pipe; a protective sleeve (9) with a plurality of holes at the lower part is sleeved on the compensator.

2. The new single tube expansion compensator according to claim 1, wherein: the compensator corrugated pipe consists of a large corrugated pipe (3), a small corrugated pipe (2) and a short pipe (1), namely, the two ends connected with the short pipe (1) adopt a section of small corrugated pipe (2) with strong rigidity, and the middle part adopts the large corrugated pipe (3) with large compensation amount.

3. The new single tube expansion compensator according to claim 1, wherein: the welding seam of the short pipe (1) and the small corrugated pipe (2) is in a butt joint structure, namely a platform with a groove is processed at the welding position of the short pipe (1) and the small corrugated pipe (2).

4. The new single tube expansion compensator according to claim 1, wherein: the inner lining pipe (4) and the corrugated pipe are sealed by the packing (5), namely, the short pipe (1) is welded with the packing box (6), and the packing (5) is compacted by the packing gland (7) and then welded on the packing box (6).

5. The new single tube expansion compensator according to claim 1, wherein: the compensator is sleeved with the protective sleeve (9) with a plurality of holes in the lower portion, the protective sleeve (9) prevents cold air from directly impacting the corrugated pipe and the corrugated pipe to be affected by high temperature of radiation of the heat exchange pipe, three protective sleeve baffles (10) are uniformly distributed at the lower end of the short pipe (1), and the protective sleeve (9) is guaranteed not to collide with the corrugated pipe.