Connecting pipe fitting with displacement compensation function
The utility model relates to a pipeline under pressure field, what specifically say so is a connect pipe fitting with displacement compensation function.
Due to process route and equipment limitations, pipelines are required to connect pipes of different diameters directly. The socket connection cannot meet the requirements due to the pressure of the medium.
At present, as shown in fig. 1, reducer pipes are mainly used in engineering to realize connection between pipelines with different diameters. The middle section of the reducer pipe is a conical cylinder, two ends of the reducer pipe are connected with a straight cylinder through welding, and the diameter of the straight cylinder is respectively the same as that of pipelines at the two ends and is connected with the pipelines in a welding mode. The general wall thickness of reducing pipe equals with the pipeline, consequently can better satisfy the pressure-bearing requirement, and the technology is comparatively ripe, can satisfy the operation requirement of various pipelines. However, the problem that this scheme exists is that when the pipeline both ends are equipment or fixed bolster, because the medium temperature is higher, the pipeline is thermal expansion under the expend with heat and contract with cold effect, and reducing pipe itself is rigid connection pipe fitting, can not compensate thermal displacement, can produce great thrust to equipment or support. And the connecting part of the straight pipe section and the conical section of the reducer pipe can generate stress concentration, so that the fatigue failure is easy to occur. An additional compensator is required to absorb the thermal displacement of the pipe.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a connect pipe fitting with displacement compensation function, this pipe fitting can realize the lug connection of different high temperature diameter pipelines, can compensate pipeline thermal displacement by oneself simultaneously, and have better fatigue resistance ability.
In order to realize the technical purpose, the adopted technical scheme is as follows: the utility model provides a connect pipe fitting with displacement compensation function, includes the minor diameter pipeline, half-wave shell flexonics pipe fitting and the major diameter pipeline of establishing ties mutually, and half-wave shell flexonics pipe fitting is for having the bellows of half crest and straight limit section, and straight limit section and minor diameter pipeline welding, the diameter of straight limit section is unanimous with the pipe diameter of minor diameter pipeline, and half crest and major diameter pipeline welding, the diameter of half crest is unanimous with the pipe diameter of major diameter pipeline.
The half-wave shell flexible connecting pipe fitting is manufactured based on a metal corrugated pipe.
The utility model has the advantages that: this patent is through changing the connection pipe fitting to corrugated metal pipe is as the component, makes half-wave shell adjustment connection size, makes the not unidimensional pipeline of pipe fitting adaptation, and carries out butt weld with both ends pipeline. When the temperature changes, the pipeline expands with heat and contracts with cold, and the pipe fitting has a work hardening effect during forming, so that the pipe fitting can bear medium pressure with a thinner wall thickness. Due to the fact that the wall thickness is small, and due to the structural characteristics of the corrugated pipe, flexibility is good, and displacement compensation can be achieved well. And the rigidity is low, the displacement counterforce is small during displacement compensation, and large thrust cannot be caused to equipment. The design and the process are mature, the two ends of the pipeline are connected into butt joints, the stress form is good, and the required fatigue life requirement can be met.
FIG. 1 is a schematic view of a prior art connecting tube;
FIG. 2 is a schematic structural view of the present invention;
1. the device comprises a device 2, a small-diameter pipeline 3, a half-wave shell flexible connecting pipe fitting 4, a large-diameter pipeline 5 and a reducer pipe.
The invention is described in connection with the drawings and the detailed description. However, the present invention is not limited to these embodiments, and can be applied to other pipes having the same working conditions.
The utility model provides a connect pipe fitting with displacement compensation function, including the minor diameter pipeline 2 that establishes ties mutually, half-wave shell flexonics pipe fitting 3 and major diameter pipeline 4, half-wave shell flexonics pipe fitting 3 is the bellows for having half crest and straight limit section, the bellows is flexible good, fatigue resistance can be strong, straight limit section and the welding of minor diameter pipeline 2, the diameter of straight limit section is unanimous with the pipe diameter of minor diameter pipeline 2, half crest and the welding of major diameter pipeline 4, the diameter of half crest is unanimous with the pipe diameter of major diameter pipeline 4, the bellows of half wave formula realizes that the different pipeline size in both ends is connected.
The corrugated pipe is a metal corrugated pipe, and has stronger bearing capacity and fatigue resistance.
When the equipment is started, the medium temperature rises, the temperature of the pipeline rises, the pipeline is thermally expanded, the connecting end of the pipeline extends oppositely, the right end of the small-diameter pipeline 2 drives the left end of the pipe fitting to move rightwards, the large-diameter pipeline 4 drives the right end of the pipe fitting to move leftwards, and the half-wave shell flexible connecting pipe fitting 3 deforms to compensate thermal displacement. When the vehicle is stopped, the temperature of the medium and the pipeline is reduced, and the half-wave shell flexible connecting pipe fitting 3 returns to the original length. Because the metal corrugated pipe has a strain strengthening effect after being formed, the metal corrugated pipe can bear medium pressure with a thinner wall thickness. Because the wall thickness is little, half-wave shell flexibility is better, can absorb the displacement of pipeline because temperature variation produces, plays the pipeline section compensation effect. And the rigidity is low, so that large additional thrust cannot be caused to equipment. The design and the process are mature, the cyclic displacement caused by starting and stopping the vehicle can be borne, and the required fatigue life requirement is met.