RU2360176C2 - Displacement expansion joint - Google Patents

Abstract

FIELD: mechanics.

SUBSTANCE: displacement expansion joint consists of bellows, reducers, flanges, safety cylinder and limiter of angular and axial displacements. Reducers are provided with annular protrusions with spherical surfaces, and safety cylinder has an inner sphere on one of its ends and consists of two semi-cylinders connected to each other by fasteners; spherical surface of safety cylinder is mated with reducer's annular protrusion shpere having the same radius, and on the other end of safety cylinder, its inner cylindrical surface is mated with spherical surface of annular protrusion of the other reducer.

EFFECT: improving expansion joint operating reliability owing to introducing a movable spherical connection into the design between safety cylinder and reducer on one end of expansion joint, and a sliding connection between safety cylinder and reducer on the other end of expansion joint.

2 dwg

Description

The invention relates to space rocket technology.

Highways of pneumohydraulic systems consist of pipelines, valves, compensation elements, dampers, receivers, filters and other elements.

Compensation elements of the line ensure the operability of pipelines during mutual deformations of the elements of the line connected by them, and the options for using compensation elements depend both on the size and nature of these deformations, and on the capabilities of the compensation elements themselves.

Depending on the nature of the deformations, pipelines with compensation lyres, pipelines with bellows expansion joints for angular and axial deformations, metal hoses and others in various combinations can be used as compensation elements of the line.

Known compensator according to patent No. 2183297, containing a bellows and a stroke limiter corrugation.

Known compensator for movement of the pipeline according to patent No. 2146786, containing a bellows, adapters, flanges, a protective cylinder and limiters of the angular and axial movements of the bellows, selected for the prototype.

The disadvantage of the prototype is that the protective cylinder is mounted cantilever and rigidly on one of the adapters of the compensator, as a result of which, when the compensator is loaded with long vibrodynamic loads, its destruction can occur, which significantly reduces the reliability of the design.

The objective of the proposed displacement compensator is to increase the reliability of the compensator by introducing into the design a movable spherical connection between the protective cylinder and the adapter from one end of the compensator, as well as a sliding connection between the protective cylinder and the adapter from the other end of the compensator.

The problem is solved due to the fact that in the movement compensator containing a bellows, adapters, flanges, a protective cylinder and a limiter of angular and axial movements, the adapters are equipped with annular protrusions with spherical surfaces, and the protective cylinder at one end has an internal sphere and consists of two half cylinders, interconnected by fasteners; the protective cylinder mates with its spherical surface to the sphere of the annular protrusion of the adapter having the same radius, and at the other end of the protective cylinder its inner cylindrical surface mates with the spherical surface of the annular protrusion of the other adapter.

Figure 1 and 2 presents the compensator displacements:

1 - spherical surfaces;

2 - half cylinders;

3 - flanges;

4 - bellows;

5 - a protective cylinder;

6 - limiter;

7 - annular protrusions;

8 - inner sphere;

9 - fasteners;

10 - inner surface;

11 is the radius of the sphere.

The displacement compensator contains a bellows 4, adapters 12, flanges 3, a protective cylinder 5 and a limiter 6 of angular and axial movements, the adapters 12 are equipped with annular protrusions 7 with spherical surfaces 1, and the protective cup 5 has an inner sphere 8 and consists of two half cylinders 2, interconnected by fasteners 9; one of the adapters 12 with its spherical surface 1 of the annular protrusion 7 is mated with the inner sphere 8 of the protective cylinder 5 having the same radius 11, and the inner cylindrical surface 10 of the protective cylinder 5 is supported on the spherical surface 1 of the annular protrusion 7 of the other adapter 12.

The slip of the annular protrusion 7 of the adapter 12 on the inner surface 10 of the protective cylinder 5 with a minimum clearance and the rotation of the spherical surface 8 of the protective cylinder 5 relative to the spherical surface 1 of the annular protrusion 7 of the adapter 12 provide both tension (compression) and bending of one part of the device relative to the other, and the presence of two supports of the compensating element when loading the compensator with long vibrodynamic loads increase its operational reliability.

The parameters of the bellows 4 are determined by calculation from the conditions of its compensation capabilities and the maximum calculated values of the relative displacements that need to be compensated.

For cryogenic operating conditions of the device in order to limit heat transfer from one part of the device to another, the protective cylinder 5 can be made of a material with low thermal conductivity (for example, thin-walled stainless steel, plastic materials).

Flanges 3 can be made for joining to the mating structural elements by welding or by means of a flange connection.

Compensator moves as follows.

Corrugated bellows 4 works to provide the maximum estimated magnitude of relative movements. For example, taking into account the fact that the bellows 4 can work in tension by 2/3 of the sum of the distances between the corrugations and in compression by 1/3 of the same amount, in order to maximize the use of the compensating capabilities of the bellows 4 and its uniform loading during operation, the compensator during installation, the pneumohydraulic system can be installed in the required size with preliminary stretching or compression and / or bending.

The bellows 4 can be with a sufficiently large number of corrugations, to protect it from loss of stability in the transverse direction, a protective cylinder 5 is installed on the device, and to limit the stretching of the bellows 4 beyond its working capacity, there is a limiter 6 in the protective cylinder 5.

During operation, the compensator with its bellows 4 compensates for all plus and minus movements in both longitudinal and transverse directions. In addition, it has the ability to bend, with the slip of the spherical surface 8 of the protective cylinder 5 relative to the spherical surface 1 of the annular protrusion 7 of the adapter 12 and the spherical surface 1 of the annular protrusion 7 of the other adapter 12 relative to the cylindrical surface 10 of the protective cylinder 5. Thus, all possible relative displacements.

Due to the spherical connection of the protective cylinder 5 with the spherical surface on the annular protrusion 7 of one adapter 12 and its sliding support on the spherical surface 1 of the annular protrusion 7 of the other adapter 12, the compensator can work when loading it with long vibrodynamic loads, which significantly increases the reliability of the design.

Claims (1)

A movement compensator comprising a bellows, adapters, flanges, a protective cylinder and a limiter of angular and axial movements, characterized in that the adapters are equipped with annular protrusions with spherical surfaces, and the protective cylinder at one end has an internal sphere and consists of two half-cylinders interconnected by fasteners elements; the protective cylinder mates with its spherical surface to the sphere of the annular protrusion of the adapter having the same radius, and at the other end of the protective cylinder its inner cylindrical surface mates with the spherical surface of the annular protrusion of the other adapter.

Images