Three-dimensional compound universal sleeve expansion joint of economizer

Abstract

The three-dimensional compound universal sleeve expansion joint comprises a left flange, a first corrugated pipe, a core pipe, a sleeve, a second corrugated pipe and a right flange, and a left annular plate and a right annular plate are arranged on the two sides of each corrugated pipe; the left flange is connected with a left annular plate of the first corrugated pipe through a left connecting pipe, and a right annular plate is connected with the core pipe; the core pipe is sleeved with a sleeve, the sleeve is connected with a left annular plate of the second corrugated pipe through a middle connecting pipe, and a right annular plate of the second corrugated pipe is connected with a right flange through a right connecting pipe. The corrugated pipe is provided with a balance ring which is connected with the left annular plate through a hinge. The double corrugated pipes, the limiting rods and the hinge mechanisms are adopted, the rigidity of the expansion joint is improved, the pull-off phenomenon is avoided, and therefore the reliability of the expansion joint is improved; two universal hinges are adopted to transmit radial force, axial force is compensated through a middle sleeve, and a limiting rod is additionally arranged between a corrugated pipe and the sleeve. And the transition pipe adopts a step-free shrinkage cavity process, so that the service life of the expansion joint is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of economizers of boilers, in particular to a three-dimensional compound universal sleeve expansion joint for an economizer. Background Art

[0002] An economizer is installed at the flue gas outlet of a boiler to absorb the waste heat of high-temperature flue gas, and the recovered heat is used to heat the boiler feed water. At the same time, the temperature of the discharged flue gas is reduced, energy is saved, and the coal combustion efficiency is improved. Therefore, it is called an economizer.

[0003] At present, the pipeline expansion joints used in economizers of coal-fired power plants generally adopt eccentric sleeve bellows compensators. Their compensation amount is achieved through the expansion and contraction of the bellows and the internal connecting pipe, which can offset the deformation and frictional force generated by the pipeline expansion.

[0004] The compensators of existing economizers usually have problems such as insufficient stiffness of the connecting pipe and the bellows, resulting in a relatively high probability of compensator failures; and the sleeves used in the compensators have no tie rod limit, and it is easy to occur the phenomenon of pulling off after being used for a period of time, thus causing the system to fail to operate normally and bringing potential safety hazards. On the other hand, the eccentric pipe of the compensator adopts a stepped connection method, which not only causes obstacles to the flow of the medium in the pipeline, but also easily leads to leakage of the pipeline due to wear caused by long-term scouring of the medium. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a three-dimensional compound universal sleeve expansion joint for an economizer, which adopts double bellows, a limit rod and a hinge mechanism, not only improves the stiffness and compensation amount of the expansion joint, but also will not produce the phenomenon of pulling off after long-term use, thereby improving the reliability of the expansion joint.

[0006] The purpose of the utility model is realized by adopting the following technical solutions:

[0007] The three-dimensional compound universal sleeve expansion joint for an economizer includes a left flange, a first bellows, a core pipe, a sleeve, a second bellows and a right flange connected in sequence. Left and right ring plates are respectively arranged on both sides of the first bellows and the second bellows;

[0008] The left flange is connected to the left ring plate of the first bellows through a left connecting pipe, and the right ring plate of the first bellows is connected to the core pipe;

[0009] The core pipe is sleeved in the sleeve, the sleeve is connected to the left ring plate of the second bellows through an intermediate connecting pipe, and the right ring plate of the second bellows is connected to the right flange through a right connecting pipe;

[0010] Balancing rings are respectively arranged on the first bellows and the second bellows, and the balancing rings are connected to the left ring plates through hinges.

[0011] As a preferred technical solution of the present utility model, the first corrugated pipe and the second corrugated pipe are respectively sleeved inside the balance ring.

[0012] As a preferred technical solution of the present utility model, a sleeve is provided at the left end of the casing, the sleeve is sleeved on the outer surface of the casing, an end cover is provided outside the sleeve, a packing cavity is provided between the end cover and the end face of the casing, and sealing packing is provided inside the packing cavity.

[0013] As a preferred technical solution of the present utility model, a side plate is provided at the left end of the sleeve, and a limiting rod is provided between the side plate and the right ring plate of the first corrugated pipe.

[0014] As a preferred technical solution of the present utility model, the side plate of the sleeve and the end cover are connected by a bolt and nut assembly.

[0015] As a preferred technical solution of the present utility model, a tapered transition pipe is provided between the casing and the intermediate pipe.

[0016] As a preferred technical solution of the present utility model, the diameter of the casing is larger than the diameter of the intermediate pipe.

[0017] As a preferred technical solution of the present utility model, annular pipes are provided inside the inner cavities of the first corrugated pipe and the second corrugated pipe, and the right end of the annular pipe is connected to the right ring plate.

[0018] As a preferred technical solution of the present utility model, the right end of the left pipe extends into the inner cavity of the annular pipe; the right end of the intermediate pipe extends into the inner cavity of the annular pipe.

[0019] As a preferred technical solution of the present utility model, a barrier ring is provided on the outer surface of the right end of the left pipe, and the barrier ring is provided between the right end of the left pipe and the inner surface of the annular pipe;

[0020] A barrier ring is provided on the outer surface of the right end of the intermediate pipe, and the barrier ring is provided between the right end of the intermediate pipe and the inner surface of the annular pipe.

[0021] Advantages of the present utility model: Compared with the prior art, the present utility model adopts double corrugated pipes, limiting rods and hinge mechanisms, which not only improve the stiffness and compensation amount of the expansion joint, but also do not cause pull-off phenomenon during long-term use, thereby improving the reliability of the expansion joint.

[0022] The present utility model uses two universal hinges to transmit the force generated by the radial displacement of the expansion joint, the axial force is compensated by the intermediate sleeve, and limiting rods are added between the corrugated pipe and the sleeve; a tapered transition pipe is provided between the casing and the intermediate pipe, and the transition pipe adopts a shrinkage hole process without internal steps, so that the medium of the economizer can pass smoothly, and the service life of the expansion joint is greatly extended. Description of the Drawings

[0023] Figure 1 is a schematic structural view of the present utility model.

[0024] In the figure: 1. Left flange, 2. Left ring plate, 3. Hinge, 4. Left connecting pipe, 5. First bellows, 6. Balance ring, 7. Core pipe, 8. Limiting rod, 9. Sleeve, 10. Sleeve pipe, 11. Transition pipe, 12. Intermediate connecting pipe, 13. Right connecting pipe, 14. Right flange, 15. Second bellows, 16. Side plate, 17. Right ring plate, 18. End cover, 19. Sealing packing, 20. Annular pipe. Specific embodiments

[0025] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0026] As Figure 1 shown, the economizer three-dimensional compound universal sleeve expansion joint includes a left flange 1, a first bellows 5, a core pipe 7, a sleeve pipe 10, a second bellows 15 and a right flange 14 connected in sequence. Left ring plates 2 and right ring plates 17 are respectively arranged on both sides of the first bellows 5 and the second bellows 15; the left flange 1 is connected to the left ring plate 2 of the first bellows 5 through a left connecting pipe 4, and the right ring plate 17 of the first bellows 5 is connected to the core pipe 7; the core pipe 7 is sleeved in the sleeve pipe 10, the sleeve pipe 10 is connected to the left ring plate of the second bellows 15 through an intermediate connecting pipe 12, and the right ring plate of the second bellows 15 is connected to the right flange 14 through a right connecting pipe 13; balance rings 6 are respectively arranged on the first bellows 5 and the second bellows 15, and the balance rings 6 are connected to the left ring plate 2 through hinges 3.

[0027] In this embodiment, the first bellows 5 and the second bellows 15 are respectively sleeved in the balance rings 6. A sleeve 9 is arranged at the left end of the sleeve pipe 10, the sleeve 9 is sleeved on the outer surface of the sleeve pipe 10, an end cover 18 is arranged outside the sleeve 9, a packing cavity is arranged between the end cover 18 and the end face of the sleeve pipe 10, and a sealing packing 19 is arranged in the packing cavity. A side plate 16 is arranged at the left end of the sleeve 9, and a limiting rod 8 is arranged between the side plate 16 and the right ring plate 17 of the first bellows 5. The side plate 16 of the sleeve 9 and the end cover 18 are connected through a bolt and nut assembly.

[0028] A conical transition pipe 11 is arranged between the sleeve pipe 10 and the intermediate connecting pipe 12; the diameter of the sleeve pipe 10 is larger than the diameter of the intermediate connecting pipe 12. Annular pipes 20 are arranged in the inner cavities of the first bellows 5 and the second bellows 15, the right ends of the annular pipes 20 are connected to the right ring plates; the right end of the left connecting pipe 1 extends into the inner cavity of the annular pipe 20; the right end of the intermediate connecting pipe 12 extends into the inner cavity of the annular pipe.

[0029] In this embodiment, a barrier ring is provided on the outer surface of the right end of the left connection pipe 1, and the barrier ring is provided between the right end of the left connection pipe 1 and the inner surface of the annular pipe 20. A barrier ring is provided on the outer surface of the right end of the intermediate connection pipe 12, and the barrier ring is provided between the right end of the intermediate connection pipe 12 and the inner surface of the annular pipe 20.

[0030] The above embodiments are only limited to explaining the concept and technical features of the present invention, and are intended to enable those skilled in the art to understand the technical solutions and implementation manners of the present invention, and cannot be used to limit the protection scope of the present invention accordingly. Any equivalent replacement or equivalent change made according to the technical solutions of the present invention should be covered within the protection scope of the present invention.

Claims

1. A three-dimensional compound universal sleeve expansion joint for economizer, comprising a left flange, a first bellows, a core pipe, a sleeve, a second bellows and a right flange which are connected in sequence, and characterized in that: A left ring plate and a right ring plate are respectively provided on both sides of the first bellows and the second bellows; The left flange is connected to the left ring plate of the first bellows through the left connecting pipe, and the right ring plate of the first bellows is connected to the core pipe; The core tube is sleeved in the sleeve, the sleeve is connected to the left ring plate of the second bellows through an intermediate pipe, and the right ring plate of the second bellows is connected to the right flange through a right pipe; The first bellows and the second bellows are respectively provided with a balancing ring, and the balancing ring is connected to the left ring plate through a hinge.

2. The three-dimensional compound universal sleeve expansion joint of the economizer according to claim 1, wherein: The first bellows and the second bellows are respectively sleeved in the balance ring.

3. The three-dimensional compound universal sleeve expansion joint of the economizer according to claim 1, wherein: The left end of the sleeve is provided with a sleeve, the sleeve is sleeved on the outer surface of the sleeve, an end cover is provided on the outer side of the sleeve, a stuffing cavity is provided between the end cover and the end surface of the sleeve, and a sealing stuffing is provided in the stuffing cavity.

4. The three-dimensional compound universal sleeve expansion joint of the economizer according to claim 3, characterized in that: A side plate is provided at the left end of the sleeve, and a limiting rod is provided between the side plate and the right ring plate of the first corrugated pipe.

5. The three-dimensional compound universal sleeve expansion joint of the economizer according to claim 4, characterized in that: The side plate of the sleeve is connected to the end cover via a bolt and nut assembly.

6. The three-dimensional compound universal sleeve expansion joint of the economizer according to claim 1, characterized in that: A tapered transition pipe is provided between the sleeve and the intermediate connecting pipe.

7. The three-dimensional compound universal sleeve expansion joint of the economizer according to claim 6, characterized in that: The diameter of the sleeve is greater than the diameter of the intermediate pipe.

8. The three-dimensional compound universal sleeve expansion joint of the economizer according to claim 1, characterized in that: The inner cavities of the first bellows and the second bellows are both provided with an annular tube, and the right ends of the annular tubes are connected to the right annular plate.

9. The three-dimensional compound universal sleeve expansion joint of the economizer according to claim 8, characterized in that: The right end of the left connecting pipe extends into the inner cavity of the annular tube; the right end of the middle connecting pipe extends into the inner cavity of the annular tube.

10. The three-dimensional compound universal sleeve expansion joint of the economizer according to claim 9, characterized in that: The outer surface of the right end of the left connecting pipe is provided with a blocking ring, and the blocking ring is provided between the right end of the left connecting pipe and the inner surface of the annular tube; The outer surface of the right end of the middle connecting pipe is provided with a blocking ring, and the blocking ring is arranged between the right end of the middle connecting pipe and the inner surface of the annular tube.

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