Coating assembly suitable for straight pipe pressure balance type expansion joint

Abstract

The invention discloses a coating assembly suitable for a straight pipe pressure balance type expansion joint, and belongs to the technical field of expansion joints. The coating assemblies comprise the two working corrugated pipe coating assemblies and the balance corrugated pipe coating assembly, the working corrugated pipe coating assemblies are arranged on the outer ring of the first working corrugated pipe and the outer ring of the second working corrugated pipe, and the balance corrugated pipe coating assembly is arranged on the outer ring of the balance corrugated pipe. The coating assembly provided by the invention is composed of a plurality of groups of equally-divided circumferences, each group of equally-divided circumferences can be spliced and fixed to form a circumference shape, the coating assembly can be directly arranged on outer rings of a working corrugated pipe and a balance corrugated pipe in an existing structure, and on-site coating and repairing of the expansion joint are carried out in a mode that equipment is not stopped; economic losses caused by shutdown can be effectively reduced, the small wrapping corrugated pipe and the large wrapping corrugated pipe with the waveform parameters meeting the pressure balance requirement can be selected at the same time, and it is guaranteed that the wrapped expansion joint can meet the original performance requirement.

Description

Technical Field

[0001] The invention relates to expansion joint technology, in particular to a covering component suitable for a straight pipe pressure balance type expansion joint. Background Art

[0002] Expansion joints are used to absorb the stress caused by temperature changes in pipelines. They are easily damaged by factors such as fatigue, corrosion and product quality. Damaged expansion joints will bring many uncertain safety hazards to pipelines and equipment: at the least, they will affect the normal operation of the equipment, and at the worst, they will affect the site and surrounding environment, endangering the safety of equipment and production.

[0003] The existing method to solve the damage of expansion joints is to temporarily shut down the equipment, replace a new expansion joint after emergency treatment. However, equipment shutdown and replacement will cause great economic losses to the company. It is urgent to repair the expansion joint by non-stop coating. The current coating expansion joint type is limited to the on-site coating of simple structure expansion joints such as general and duplex. The traditional straight pipe pressure balanced expansion joint consists of two working bellows, a balancing bellows, a pipe and an end pipe. Due to the complex structure and compact construction space, it is difficult to install on site. Summary of the invention

[0004] The object of the present invention is to provide a covering component suitable for a straight pipe pressure balance type expansion joint which is easy to install on site.

[0005] The technical solution of the present invention is: a covering assembly suitable for a straight tube pressure balanced expansion joint, the straight tube pressure balanced expansion joint comprises a first working bellows, a balancing bellows, and a second working bellows arranged in sequence from left to right, a transition pipe and a pressure-bearing ring plate are arranged between the balancing bellows and the first working bellows and the second working bellows, the free ends of the first working bellows and the second working bellows and both sides of the balancing bellows are provided with end pipes, the covering assembly is composed of a plurality of groups of equally divided circles, and each group of equally divided circles can be spliced ​​and fixed to form a circular shape; the covering assembly comprises two groups of working bellows covering assemblies and one group of balancing bellows covering assemblies, the working bellows covering assembly is arranged on the outer rings of the first working bellows and the second working bellows, and the balancing bellows covering assembly is arranged on the outer ring of the balancing bellows.

[0006] A further technical solution is to divide the circumference into 1 / 4, 1 / 3 or 1 / 2 of the circumference.

[0007] A further technical solution is that the working bellows sheathing assembly includes a sheathed small bellows and a transition small sheathed pipe connected by a pipe, the sheathed small bellows and the transition small sheathed pipe are respectively composed of a number of equally divided circles, and each group of equally divided circles can be spliced ​​and fixed to form a circular shape; the sheathed small bellows is connected to the end sheathed pipe through an end ring, and the transition small sheathed pipe is connected to the transition sheathed pipe through an end ring.

[0008] A further technical solution is that the balancing bellows sheathing assembly includes a first large transition pipe, a sheathing large bellows, and a second large transition pipe connected by a pipe. The first large transition pipe, the sheathing large bellows, and the second large transition pipe are respectively composed of a number of equally divided circles, and each group of equally divided circles can be spliced ​​and fixed to form a circular shape; the first large transition pipe is connected to the end pipe on one side of the balancing bellows through an end ring, and the second large transition pipe is fixedly mounted on the pressure ring plate on the other side of the balancing bellows, and an end ring is also provided between the second large transition pipe and the pipe of the sheathing large bellows.

[0009] According to a further technical solution, a rib plate is provided between the second large transition connecting pipe and the pressure ring plate.

[0010] Beneficial effects of the present invention:

[0011] The coating component provided by the present invention is directly arranged on the outer ring of the working bellows and the balancing bellows in the existing structure. The coating component is composed of a plurality of groups of equally divided circles, and each group of equally divided circles can be spliced ​​and fixed to form a circular shape. The coating component can be directly arranged on the outer ring of the working bellows and the balancing bellows in the existing structure. The on-site coating of the expansion joint can be repaired without stopping the equipment, which can effectively save the economic losses caused by shutdown and simultaneously select the coated small bellows and the coated large bellows whose waveform parameters meet the requirements of pressure balance, so as to ensure that the expansion joint after coating can meet the original performance requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention.

[0013] Among them, 1. the first working bellows, 2. the balancing bellows, 3. the second working bellows, 4. the transition pipe, 5. the pressure-bearing ring plate, 6. the end pipe, 7. the coated small bellows, 8. the transition small pipe, 9. the end ring, 10. the first transition large pipe, 11. the coated large bellows, 12. the second transition large pipe, 13. the rib plate. DETAILED DESCRIPTION

[0014] The present invention is further described and understood by the following non-limiting examples.

[0015] like Figure 1As shown, the present invention provides a covering assembly suitable for a straight tube pressure balanced expansion joint, the straight tube pressure balanced expansion joint comprises a first working bellows 1, a balancing bellows 2, and a second working bellows 3 which are arranged in sequence from left to right, a transition pipe 4 and a pressure-bearing ring plate 5 are arranged between the balancing bellows 2 and the first working bellows 1 and the second working bellows 3, and end pipes 6 are arranged at the free ends of the first working bellows 1 and the second working bellows 3 and on both sides of the balancing bellows 2, the covering assembly consists of a plurality of groups of equally divided circles, each group of equally divided circles can be spliced ​​and fixed to form a circular shape, and according to the size of the caliber, the circumference can be divided into 2, 3, or 4 equal parts to form equally divided circles; the covering assembly comprises two groups of working bellows covering assemblies and one group of balancing bellows covering assemblies, the working bellows covering assembly is arranged on the outer rings of the first working bellows 1 and the second working bellows 3, and the balancing bellows covering assembly is arranged on the outer ring of the balancing bellows 2.

[0016] The working bellows sheath assembly includes a small sheathed bellows 7 and a small transitional pipe 8 connected by pipes. The small sheathed bellows 7 and the small transitional pipe 8 are respectively composed of a number of equally divided circles, and each group of equally divided circles can be spliced ​​and fixed to form a circular shape. The small sheathed bellows 7 is connected to the end pipe 6 through an end ring 9, and the small transitional pipe 8 is connected to the transitional pipe 4 through an end ring 9.

[0017] The balancing bellows 2 covering assembly includes a first transition large pipe 10, a covering large bellows 11, and a second transition large pipe 12 connected by a pipe, wherein the first transition large pipe 10, the covering large bellows 11, and the second transition large pipe 12 are respectively composed of a number of equally divided circles, and each group of equally divided circles can be spliced ​​and fixed to form a circular shape. The first transition large pipe 10 is connected to the end pipe 6 on one side of the balancing bellows 2 through an end ring 9, and the second transition large pipe 12 is fixedly installed on the pressure ring plate 5 on the other side of the balancing bellows 2. A rib plate 13 is provided between the second transition large pipe 12 and the pressure ring plate 5, and an end ring 9 is also provided between the second transition large pipe 12 and the pipe of the covering large bellows 11.

[0018] During on-site construction, first plug the original straight pipe pressure balance expansion joint to ensure that there is no leakage in the on-site expansion joint. Then install it according to the following installation steps: 1. Install the working bellows sheathing components on both sides first, 2. Install the balance bellows 2 sheathing components, 3. Test the pressure to check for leaks.

[0019] Since the cross-sectional area of ​​the bellows increases after coating, the blind plate force increases. Therefore, before on-site construction, the waveform parameters of the coated small bellows 7 and the coated large bellows 11 are selected according to the pressure balance requirements to ensure that the waveform parameters of the coated small bellows 7 and the coated balanced large bellows meet the pressure balance requirements. At the same time, the force requirements of the load-bearing pipe are recalculated according to the coated small bellows 7 and the coated large bellows 11 to ensure that the load-bearing pipe in this structure meets the blind plate force generated by the coated small bellows 7 and the coated large bellows. If the load-bearing pipe cannot meet the force requirements, a load-bearing structure is added externally: such as a rib plate 13, etc.

[0020] In summary, the coating assembly provided by the present invention is directly arranged on the outer ring of the first working bellows 1, the second working bellows 3 and the balancing bellows 2 in the existing structure, and can repair the expansion joint on-site without stopping the equipment, which can effectively save the economic losses caused by shutdown. At the same time, the coated small bellows 7 and the coated large bellows 11 whose waveform parameters meet the requirements of pressure balance are selected to ensure that the expansion joint after coating can meet the original performance requirements.

[0021] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A covering assembly suitable for a straight tube pressure balanced expansion joint, the straight tube pressure balanced expansion joint comprises a first working bellows, a balancing bellows, and a second working bellows arranged in sequence from left to right, a transition pipe and a pressure-bearing ring plate are arranged between the balancing bellows and the first working bellows and the second working bellows, and end pipes are arranged at the free ends of the first working bellows and the second working bellows and on both sides of the balancing bellows, characterized in that: The covering assembly is composed of several groups of equally divided circles, and each group of equally divided circles can be spliced ​​and fixed to form a circular shape; the covering assembly includes two groups of working bellows covering assemblies and one group of balancing bellows covering assemblies, the working bellows covering assemblies are arranged on the outer rings of the first working bellows and the second working bellows, and the balancing bellows covering assembly is arranged on the outer ring of the balancing bellows.

2. A covering assembly suitable for a straight pipe pressure balanced expansion joint according to claim 1, characterized in that: The equally divided circumference is 1 / 4 circumference, 1 / 3 circumference or 1 / 2 circumference.

3. A covering assembly suitable for a straight pipe pressure balanced expansion joint according to claim 1, characterized in that: The working bellows sheathing assembly includes a sheathed small bellows and a transition small pipe connected by a pipe. The sheathed small bellows and the transition small pipe are respectively composed of a number of equally divided circles, and each group of equally divided circles can be spliced ​​and fixed to form a circular shape; the sheathed small bellows is connected to the end pipe through an end ring, and the transition small pipe is connected to the transition pipe through an end ring.

4. A covering assembly suitable for a straight pipe pressure balanced expansion joint according to claim 1, characterized in that: The balancing bellows sheathing assembly includes a first large transition pipe, a sheathing large bellows, and a second large transition pipe connected by a pipe. The first large transition pipe, the sheathing large bellows, and the second large transition pipe are respectively composed of a number of equally divided circles, and each group of equally divided circles can be spliced ​​and fixed to form a circular shape; the first large transition pipe is connected to the end pipe on one side of the balancing bellows through an end ring, and the second large transition pipe is fixedly installed on the pressure ring plate on the other side of the balancing bellows. An end ring is also arranged between the second large transition pipe and the pipe of the sheathing large bellows.

5. The covering assembly suitable for a straight pipe pressure balanced expansion joint according to claim 1, characterized in that: A rib plate is provided between the second large transition connecting pipe and the pressure-bearing ring plate.

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