CN201715128U - Connecting structure for metal bellows - Google Patents

Abstract

The utility model discloses a connecting structure for a metal bellows, which belongs to the technical field of mechanical manufacturing and is used for connecting the metal bellows with end tubes. The connecting structure is characterized in that: the bellows is connected with the end tubes through steel band rings, the end tubes are inserted in the steel band rings, the inner ends of the end tubes are extended out of the steel band rings, the outer surfaces of the extended parts are lapped with the inner surfaces of the outer ends of the bellows, the outer ends of the bellows are firmly and hermetically connected with the inner ends of the steel band rings, and the outer ends of the steel band rings are firmly and hermetically connected with the inner ends of the end tubes. Since the connecting structure adopts the steel band rings to transitionally connect the bellows with the end tubes and the ends of the bellows are connected with the steel band rings by butt welding, the connecting structure solves problems such as the cracking of the ends of the bellows, and increases the use safety and service lives of expension joints of the bellows, and the utility model can be widely applied in industries such as heat supply, flue gas and chemical.

Description

A connection structure of metal bellows

technical field

The utility model belongs to the technical field of mechanical manufacturing, in particular to a connection structure of metal bellows.

Background technique

Metal bellows expansion joint is composed of one or several metal bellows and structural parts, which are used to absorb the pipes caused by thermal expansion and contraction, and prepare metal devices for dimensional changes. They are widely used in heating, gas, chemical industry, etc. industry. Metal bellows expansion joints save space and save materials. The bellows expansion joint is composed of elastic element bellows and end pipes, brackets, flanges, conduits and other accessories. In the existing connection structure, the metal bellows and the end pipe are directly connected by fillet welding. Because the fillet weld is a geometric mutation structure, it is often a stress concentration area during the forming process, and the crack failure is the fillet weld. Therefore, the connection structure between the metal bellows and the end pipe is a main part of the failure of the expansion joint, and it is also a weak part of the bellows expansion joint.

Utility model content

The utility model aims to provide a technical solution for the reliable connection between the metal bellows and the end pipe, which solves the shortcoming that the bellows and the end pipe of the metal bellows expansion joint are easy to fail in the prior art, and is an expansion joint for the metal bellows. It provides a reliable scientific method for the safe utilization and service life improvement of energy saving.

The connection structure of a metal bellows is used for the connection between the bellows and the end pipe, and is characterized in that the bellows and the end pipe are connected by a steel belt ring, the end pipe is inserted into the steel belt ring and the end pipe The inner end of the inner end protrudes from the steel belt ring, and the outer surface of the extended part overlaps with the inner surface of the outer end of the bellows. The outer end of the bellows is fixed and sealed with the inner end of the steel belt ring, and the outer end of the steel belt ring is fixed to the inner end of the end pipe. Sealed connection.

The connection structure of a metal bellows is characterized in that the inner end of the steel belt ring and the outer end of the bellows are fixed and sealed by butt welds at both ends; the outer end of the steel belt ring and the inner end of the end pipe are connected by Circumferential fillet welds securely seal the connection.

The connection structure of the metal bellows is characterized in that the wall thickness of the steel belt ring is not less than the wall thickness of the bellows.

The connection structure of metal bellows is characterized in that the bellows is a single-layer or multi-layer structure.

The connection structure of the above-mentioned metal bellows is novel in design and reasonable in conception. The steel belt ring is used to transition the bellows and the end pipe, so that the end of the bellows and the steel belt ring are butt-welded, which solves the problems of cracking at the end of the bellows and improves Bellows expansion joints are safe and durable, and can be widely used in heating, gas, chemical and other industries.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the enlarged schematic diagram of the structure of part A in Fig. 1;

In the figure: 1-end pipe, 2-corrugated pipe, 3-steel belt ring, 4-flange.

Detailed ways

Now in conjunction with the accompanying drawings, describe in detail the specific implementation of the utility model:

As shown in Figures 1 and 2, the bellows 2 is connected to the end pipe 1, and the outer end of the end pipe 1 is connected to the flange 4. The connection structure of a metal bellows is used for the bellows 2 and the end pipe. 1, the bellows 2 and the end pipe 1 are connected by a steel belt ring 3, the steel belt ring 3 is made of the same material as the bellows 2, and its wall thickness is not less than that of the bellows 2, which can satisfy the width of about Within 50mm, it is determined according to the diameter of the end pipe 1; Surface lap fit, the outer end of the bellows 2 and the inner end of the steel belt ring 3 are fixed and sealed by butt welds at both ends; the outer end of the steel belt ring 3 and the end pipe 1 are fixed and sealed by a circular fillet weld Connection; the outer end of the steel belt ring 3 is fixed and sealed with the inner end of the end pipe 1.

The connection structure of the above-mentioned metal bellows can be used for the connection between the single-layer or multi-layer bellows 2 and the end pipe 1. When the bellows 2 adopts a multi-layer structure, the wall thickness of the steel belt ring 3 is greater than that of the bellows The wall thickness of the bellows 2 can meet the requirement that each layer of the bellows 2 can be connected with the steel belt ring 3 by butt welding.

Claims (4)

1. A connection structure of a metal bellows, used for the connection between the bellows (2) and the end pipe (1), characterized in that a steel belt ring (3) is passed between the bellows (2) and the end pipe (1) Connection, the end pipe (1) is plugged into the steel belt ring (3) and the inner end of the end pipe (1) protrudes from the steel belt ring (3), and the outer surface of the protruding part is connected with the inner surface of the outer end of the bellows (2) Overlap fit, the outer end of the bellows (2) is fixed and sealed in connection with the inner end of the steel belt ring (3), and the outer end of the steel belt ring (3) is fixed and sealed in connection with the inner end of the end pipe (1). 2. The connecting structure of a metal bellows as claimed in claim 1, characterized in that the inner end of the steel belt ring (3) and the outer end of the bellows (2) are fixedly sealed and connected by butt welds at both ends; The outer end of the steel belt ring (3) is fixed and sealed with the inner end of the end pipe (1) through a circumferential fillet weld. 3. A metal bellows connection structure according to claim 1, characterized in that the wall thickness of the steel belt ring (3) is not less than the wall thickness of the bellows (2). 4. A metal bellows connection structure according to claim 1, characterized in that the bellows (2) is a single-layer or multi-layer structure.

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