CN2818995Y

CN2818995Y - Impvoed disposable directly-embedded corrugated compensator

Info

Publication number: CN2818995Y
Application number: CN 200520026114
Authority: CN
Inventors: 史广新
Original assignee: Tianjin Daqian Pipe Industry Co ltd
Current assignee: Tianjin Daqian Pipe Industry Co ltd
Priority date: 2005-06-10
Filing date: 2005-06-10
Publication date: 2006-09-20
Anticipated expiration: 2015-06-10

Abstract

The utility model belongs to an annex in the heat supplying pipeline system.It is a kind of improvement to the FlexbleJoint in the prior art.It is by bellows, inner connection tube, with the left and right continuous reducer pipe of straight length arc transition, left and right outer connecting pipe is formed.Bellows welds with inner connection tube earlier, with the left and right continuous reducer pipe and the welding of left and right outer connecting pipe of straight length arc transition, finishes its assembly with the inner connection tube welding again with the continuous reducer pipe of straight length arc transition.This compensator distance in accordance with regulations is serially connected among the direct-burried heat supplying pipeline, and temperature is with the pipeline preheating in accordance with regulations, and the outer connecting pipe with compensator welds dead again.The advantage of this programme is that its force-bearing situation of structure in when work is improved, and shows as that product strength is good, quality is high, working stability is reliable and long service life, is worth manufacturing in batches to be promoted the use of.

Description

The disposable directly buried type FlexbleJoint of modified model

One, technical field: the utility model belongs to an annex in the heat supplying pipeline system.It is specifically related to the structure of the disposable directly buried type FlexbleJoint of modified model.

Two, background technique: under industrial technology high speed development prerequisite, the life of numerous people obtains very big improvement, and the form of central heat supply is generally used in the heating in urban life at present.Promptly heating plant will be born the heating heat energy of a slice residential neighborhoods, adopts the heat-supplying mode of low pressure hot water more.Adopt this kind heat supply pattern, just brought a large amount of pipeline network engineerings.What must solve in the pipeline network engineering is the thermal compensation problem.Introduced the heat supply pipeline directly buried technology in recent years, it provides practical, reliable, economical for city heat supply and has not influenced the effective ways of the appearance of the city.Because the temperature of fed sheet of a media will change, thermal expansion or cold contraction promptly take place in pipeline, must cause the displacement of pipeline, because of the directly buried pipeline thermal walking is subjected to the constraint of soil frictional force, can not fully extend or shrink, even not flexible fully.To produce stress in the tube wall when pipeline is flexible when being obstructed, produce pressure stress when elongation is obstructed, shrink generation tensile stress when being obstructed.If the pipeline medium temperature is higher, consequently can make ducted stress reach the yield limit of steel, the safety of pipeline just can not guarantee.So, when channelling, take certain technical measures, being controlled under the medium temperature stress is zero, tensile stress and hot time pressure stress amplitude peak approximately equal under the cold conditions.Through such processing, can make full use of steel bearing capacity, avoid producing plastic deformation.The basic principle of the uncompensated channelling technology of direct-burried that Here it is.

Imagine for realizing that heating direct-buried uncompensated pipe stress distributes, need pipeline be connected back cool groove preheating (not backfill) to pipe network fluting when constructing, pipeline freely extends (pipe stress is zero) under medium temperature, and under this temperature backfilling of pipe canal is tamped.In the city,, do not allow long-time fluting to take road in order to guarantee smooth traffic.So, produced disposable direct-burried FlexbleJoint.According to the length that pipeline can freely stretch, disposable direct-burried FlexbleJoint, the thermal stretching that produces when being used for absorbing preheating are installed in segmentation respectively.And it is when reaching elongation that disposable direct-burried FlexbleJoint outer connecting pipe weldering is dead.Compensator only plays disposable absorption thermal stretching, becomes after the welding to be rigidly connected.Realized the imagination that heating direct-buried uncompensated pipe stress distributes.When pipeline is worked and female pipeline be in the same force level that is subjected to, it just appears suddenly out in the rationality of structural mechanics, becomes an important accessory of the uncompensated pipeline of direct-burried heat supply.

FlexbleJoint in prior art (Fig. 2) is respectively to weld a flange plate on the connecting tube at bellows two ends, on flange plate, weld outer connecting pipe again, pipeline is welded outer connecting pipe extremely after the Temperature Treatment in accordance with regulations, because certainly leading to stress, the decision of its mutation structure concentrates, in the stressed phenomenon that can occur destruction when big.

Three. summary of the invention: the purpose of this utility model is for overcoming compensator in the prior art at stressed special this programme--the disposable directly buried type FlexbleJoint of-modified model that proposes of the phenomenon of destroying that produces when big, it is used for overcoming problem of stress concentration with the structural change stress of novel coupling sleeve, and the reliable in quality of compensator and operating life are prolonged.

By as above design, the disposable directly buried type FlexbleJoint of the modified model that this programme proposed comprises bellows, sleeve connecting tube and interconnecting tube, the sleeve connecting tube that it is characterized in that it is connected to form novel compensator assembly with inner connection tube, bellows again by forming with the left and right continuous reducer pipe and the left and right outer connecting pipe of straight length arc transition.

Adopt this programme can embody following superiority: 1. its new structure has been alleviated problem of stress concentration, and force-bearing situation is improved when work, makes the stressed son that more becomes reasonable; 2. the coupling sleeve of this programme compensator is to adopt and the continuous reducer pipe of straight length arc transition and the structure of heating tube combination, the compensator part is carried out in advance, its two ends and heat supply pipeline be welded into one get final product, processing ease: 3. new structure is to adopt and the continuous reducer pipe of straight length arc transition and the structure of heating tube combination, therefore make the outer protecting tube simple shape of insulation, be convenient to prefabricated and execute-in-place; 4. the preproduction of this programme is through probationary certificate: it has simple in structure, low cost of manufacture, good operation and high characteristics of life-span, is suitable for making in batches promoting the use of.

Four. description of drawings: Fig. 1 is the structural representation of this programme.

Fig. 2 is the structural representation of prior art compensator.

Five. embodiment: this programme is the improvement to the FlexbleJoint in the prior art.It is by with the left and right continuous reducer pipe 2,8 of straight length arc transition, left and right outer connecting pipe 4,6, inner connection tube 3 and bellows 5 are formed.Its bellows welds with inner connection tube earlier, with the left and right continuous reducer pipe and the welding of left and right outer connecting pipe of straight length arc transition, finishes its assembly with inner connection tube and with the continuous reducer pipe welding of straight length arc transition again.Distance this compensator of serial connection in direct-burried heat supplying pipeline 1 in accordance with regulations during use, with pipeline preheating temperature in accordance with regulations, after the preheating that the outer connecting pipe weldering is dead, the outer surface in the joint has also increased a plurality of welding stiffening plates 7.Whole piping becomes a normal temperature lower prestress rigidity piping, and compensator has promptly been brought into play the rigidity that its compensate function has kept piping again.The advantage of this programme is that its force-bearing situation of structure when work is improved, and compares with the original product structure, and the product strength of this programme is good, quality is high, working stability is reliable, is a kind of superior technological scheme.

Claims

1. disposable directly buried type FlexbleJoint of modified model, it comprises bellows, sleeve connecting tube and interconnecting tube, the sleeve connecting tube that it is characterized in that it is connected to form novel compensator assembly with inner connection tube (3), bellows (5) again by forming with left and right continuous reducer pipe (2), (8) and left and right outer connecting pipe (4), (6) of straight length arc transition.