CN108612911B

CN108612911B - Direct-buried heat distribution pipeline

Info

Publication number: CN108612911B
Application number: CN201810205096.3A
Authority: CN
Inventors: 胡万鹏
Original assignee: Beris Engineering and Research Corp
Current assignee: Beris Engineering and Research Corp
Priority date: 2018-03-13
Filing date: 2018-03-13
Publication date: 2020-04-10
Anticipated expiration: 2038-03-13
Also published as: CN108612911A

Abstract

The invention provides a direct-buried heat distribution pipeline, which comprises: a base pipe; a fixed tube sleeved outside the base tube; the composite heat preservation pipe is sleeved outside the fixed pipe; the bearing support is arranged between the fixed pipe and the base pipe; the elastic support component is arranged between the fixed pipe and the base pipe, wherein the elastic support component and the bearing support seat surround the base pipe at intervals, and can absorb the deformation of the base pipe through the elastic deformation of the elastic support component. The direct-buried thermal pipeline can avoid damage to a heat insulation structure caused by deformation of a base pipe for conveying a heat supply medium, and has long service life.

Description

Direct-buried heat distribution pipeline

Technical Field

The invention relates to the field of heating facilities, in particular to a direct-buried heat pipeline.

Background

The direct-buried heat distribution pipeline is used for conveying heat supply media in a heat supply pipe network so as to realize the circulating flow of the heat supply media between a heat source and a heat user, and is an essential heat supply facility in a heat supply system. In the direct-buried heat distribution pipeline in the prior art, a heat insulation structure is generally arranged outside a base pipe for conveying a heat supply medium, so that the heat supply medium in the base pipe is insulated, and the heat loss along the way in the conveying process is reduced. In the process of conveying the heat supply medium by the base pipe, because the temperature of the heat supply medium inside the base pipe is higher and the external environment temperature is lower, the base pipe is usually greatly deformed due to expansion with heat and contraction with cold, the heat insulation structure arranged outside the base pipe is probably damaged in the process, and the service life of the direct-buried heat distribution pipeline is greatly shortened. Therefore, how to avoid damage to the heat insulation structure caused by deformation of the base pipe is a problem to be solved urgently in the process of designing the direct-buried thermal pipeline by the technical personnel in the field.

Disclosure of Invention

In order to solve all or part of the problems, the invention aims to provide a direct-buried heat distribution pipeline which can avoid damage to a heat insulation structure caused by deformation of a base pipe for conveying a heat supply medium and has a long service life.

The invention provides a direct-buried heat distribution pipeline, which comprises: a base pipe; the fixed tube is sleeved outside the base tube; the composite heat-insulating pipe is sleeved outside the fixed pipe; the supporting support is arranged between the fixed pipe and the base pipe; the elastic supporting component is arranged between the fixed pipe and the base pipe, and the elastic supporting component and the bearing support are wound outside the base pipe at intervals and can absorb the deformation of the base pipe through the elastic deformation of the elastic supporting component.

Preferably, the elastic support assembly comprises: a first elastic support member which is opposed to the holder support and which applies an opposing force to the base pipe together with the holder support; a second elastic support member located between the bearer support and the first elastic support member in a circumferential direction of the base pipe; a third resilient support member opposing the second resilient support member and exerting an opposing force on the base pipe with the second resilient support member.

Preferably, the elastic support component is an arc-shaped elastic sheet buckled on the inner wall of the fixed pipe so that the outer arc surface abuts against the base pipe.

Preferably, the arc-shaped elastic sheet is made of spring steel, the radius of the arc-shaped elastic sheet is 1/8-1/3 of the inner radius of the base tube, and the arc length of the arc-shaped elastic sheet is 1/5-2/3 of the inner circumference of the base tube.

Preferably, the support mount comprises a shoe for supporting the base pipe and a support bar for connecting the shoe to a fixed pipe.

Preferably, the fixed pipe comprises a straight section and a circular arc section along the circumferential direction of the fixed pipe, and the straight section is used for installing the bearing support.

Preferably, the buried thermal pipeline further comprises a plurality of support units consisting of the first, second and third elastic support members and the bearer support, and the plurality of support units are sequentially spaced along the axis of the base pipe.

Preferably, the direct-buried heat distribution pipeline further comprises an anchoring ring sleeved outside the composite heat preservation pipe, a reinforcing rib is arranged between the anchoring ring and the fixed pipe, one end of the reinforcing rib is connected with the inner wall of the anchoring ring, and the other end of the reinforcing rib is connected with the outer wall of the fixed pipe; the number of the reinforcing ribs is multiple, and the plurality of reinforcing ribs are arranged at equal intervals along the circumferential direction of the fixing pipe.

Preferably, the composite heat preservation pipe comprises a heat reflection pipe sleeved outside the fixed pipe in a matching manner, a resin protection pipe sleeved outside the heat reflection pipe, and a foam plastic layer filled between the heat reflection pipe and the resin protection pipe.

Preferably, the fixed pipe is a steel pipe.

According to the direct-buried heat pipeline, the composite heat-insulating pipe is used for insulating heat of a heat supply medium flowing through the base pipe, and the heat dissipation loss of heat supply fluid along the way is reduced. Fixed pipe, bearing support and elastic support subassembly separate combined type insulating tube and parent tube jointly for the deformation that the parent tube takes place because expend with heat and contract with cold no longer directly acts on combined type insulating tube. Bearing support and elastic support subassembly have further played the limiting displacement to the parent tube in the fixed tube, and the deformation of parent tube acts on the elastic support subassembly, under the elastic force effect of elastic support subassembly, the deformation of parent tube is absorbed by the elastic support subassembly, make the deformation of parent tube no longer cause the damage to combined type insulating tube, thereby played the effect of the insulation construction (being combined type insulating tube) of the formula thermal power pipeline is directly buried in the protection, make directly bury formula thermal power pipeline and have longer life. In addition, the direct-buried heat distribution pipeline has the advantages of simple structure, convenient use and wide popularization and application.

Drawings

In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 is a schematic structural diagram of a direct-buried thermal pipeline in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a direct buried thermal pipeline in another embodiment of the present invention.

Description of reference numerals: 1. a base pipe; 2. a fixed tube; 3. a composite heat preservation pipe; 4. supporting a support; 5. an elastic support member; 6. reinforcing ribs; 7. an anchoring ring; 31. a heat reflection tube; 32. a resin protection tube; 33. a foam plastic layer; 41. supporting a tile; 42. a support bar; 51. a first elastic support member; 52. a second elastic support member; 53. a third elastic support member.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

Fig. 1 is a schematic structural diagram of a direct-buried thermal pipeline in an embodiment of the present invention, as shown in fig. 1, the direct-buried thermal pipeline includes a base pipe 1, a fixed pipe 2, a composite thermal insulation pipe 3, a supporting seat 4, and an elastic supporting component 5. The fixed pipe 2 is sleeved outside the base pipe 1, and the composite type heat preservation pipe 3 is sleeved outside the fixed pipe 2. The bearing support 4 is arranged between the fixed pipe 2 and the base pipe 1, and the elastic supporting component 5 is also arranged between the fixed pipe 2 and the base pipe 1. The elastic supporting component 5 and the bearing support 4 are wound outside the base pipe 1 at intervals, and the deformation of the base pipe 1 can be absorbed through the elastic deformation of the elastic supporting component 5. The fixed pipe 2 is preferably a steel pipe, so that the fixed pipe 2 has higher structural strength, and is beneficial to fixing and supporting the base pipe 1.

According to the direct-buried heat pipeline, the composite heat-insulating pipe 3 is used for insulating heat of a heat supply medium flowing through the base pipe 1, and the heat loss of heat supply fluid along the way is reduced. Fixed pipe 2, bearing support 4 and elastic support component 5 separate combined type insulating tube 3 and parent tube 1 jointly for the deformation that parent tube 1 took place because expend with heat and contract with cold no longer directly acts on combined type insulating tube 3. Bearing support 4 and elastic support component 5 have further played the limiting displacement to parent tube 1 in fixed pipe 2, and parent tube 1's deformation acts on the elastic support component, under the elastic force effect of elastic support component, parent tube 1's deformation is absorbed by the elastic support component, make parent tube 1's deformation no longer cause the damage to combined type insulating tube 3, thereby played the effect of the insulation construction (being combined type insulating tube 3) of the protection direct-burried thermal power pipeline, make the direct-burried thermal power pipeline have longer life.

In the present embodiment, the elastic support assembly 5 includes a first elastic support member 51, a second elastic support member 52, and a third elastic support member 53. The first elastic support member 51 is opposed to the holder support 4 and applies an opposing force to the base pipe 1 together with the holder support 4, the second elastic support member 52 is located between the holder support 4 and the first elastic support member 51 in the circumferential direction of the base pipe 1, and the third elastic support member 53 is opposed to the second elastic support member 52 and applies an opposing force to the base pipe 1 together with the second elastic support member 52. The elastic force of the first elastic supporting member 51 is always opposite to the supporting force of the bearing support 4, but the two acting forces are along the same straight line, the elastic forces of the second elastic supporting member 52 and the third elastic supporting member 53 are also always opposite, but the two acting forces are also along the same straight line, and through the arrangement, even if the deformation of the base pipe 1 is large, the acting force of the first, second or third elastic supporting members (51,52,53) on the base pipe 1 is large, and the base pipe 1 cannot be separated from the bearing support 4. Therefore, the elastic support assembly 5 can make the radial stress of the base pipe 1 more uniform, and the position of the base pipe 1 is prevented from being accidentally deviated.

Preferably, the elastic support component 5 is an arc-shaped elastic sheet buckled on the inner wall of the fixed pipe 2 so that the outer arc surface abuts against the base pipe 1. When the parent tube 1 takes place to warp, because the elastic force of arc shell fragment for the extrados of arc shell fragment can support all the time and lean on parent tube 1, no matter parent tube 1 is the deformation of taking place the inflation or shrink, this deflection has all finally converted the deflection of arc shell fragment into, and can not establish the combined type insulating tube 3 outside fixed pipe 2 and cover and produce the influence to fixed pipe 2. Of course, the elastic support member 5 may be a spring disposed along the radial direction of the fixed pipe 2 such that one end of the spring abuts on the inner wall of the fixed pipe 2 and the other end thereof abuts on the outer wall of the base pipe 1. But compared with a spring, the arc-shaped elastic sheet has lower cost, simpler structure and more convenient manufacture, and is easier to install between the fixed pipe 2 and the base pipe 1, thereby being beneficial to the popularization and the use of the direct-buried heat distribution pipeline.

The size structure of the arc-shaped elastic sheet is related to the size structure of the base pipe 1, because the size structure of the base pipe 1 directly determines the deformation amount when the base pipe is deformed. Specifically, the radius of the arc-shaped elastic sheet is 1/8-1/3 of the inner radius of the base tube 1, and the arc length of the arc-shaped elastic sheet is 1/5-2/3 of the inner circumference of the base tube 1. In addition, the arc-shaped elastic sheet is made of spring steel. The inventor has carried out analysis and calculation to the atress of parent tube 1 in carrying the heat supply medium in-process, and the material of reunion arc shell fragment carries out the integrated analysis with the elasticity size that the size corresponds and the quantity of arc shell fragment, then reachs above-mentioned conclusion, and when the size structure of arc shell fragment set up according to above-mentioned proportion, the elastic force of arc shell fragment neither can excessively extrude parent tube 1, can carry out better protection to combined type insulating tube 3 and fixed pipe 2 again. In addition, the length of arc shell fragment along the axis direction of parent tube 1 is 0.15 ~ 0.30m, increases the axial length of arc shell fragment along parent tube 1 to a certain extent, can improve the structural stability of formula heating power pipeline directly buried, and the skilled person in the art can select the length of arc shell fragment along the axis direction of parent tube 1 according to factors such as the actual size structure, operating condition and the cost budget of formula heating power pipeline directly buried in the reality.

The direct-buried thermal pipeline of the invention also comprises a support unit consisting of a first, a second and a third elastic support members (51,52,53) and a bearer support 4. Because the direct burial heating power pipeline lays the distance very long in the heat supply pipe network, in order to guarantee that every section direct burial heat supply pipeline homoenergetic can obtain better protection, the quantity of support unit is a plurality of, and a plurality of support units are spaced apart in proper order along the axis of parent tube 1. In the process of laying the direct-buried heat distribution pipeline, a plurality of sections of direct-buried heat distribution pipelines need to be transported to an installation site, and then all the sections of pipelines are welded, and the length of each section of direct-buried heat distribution pipeline in the prior art is 12m, so that after each section of direct-buried heat distribution pipeline is subjected to stress analysis, an inventor obtains the stress analysis after further considering the economic performance of the direct-buried heat distribution pipeline, and the spacing distance between any two adjacent supporting units is 4-6 m. The arrangement ensures that the direct-buried heat distribution pipeline does not increase the installation difficulty, does not greatly increase the cost, and can achieve the effect of better protecting the heat insulation structure.

In this embodiment, the support bearing 4 comprises a support shoe 41 for supporting the base pipe 1 and a support rod 42 for connecting the support shoe 41 to the fixed pipe 2. The contact area between the support bearing 4 and the base pipe 1 can be increased by the support shoe 41, so that the base pipe 1 is supported more firmly. And through bracing piece 42, can be more conveniently fixed bearing 4 to fixed pipe 2 on to reduce the area of contact of bearing 4 and fixed pipe 2, reduce stress concentration. The fixed pipe 2 comprises a straight section and an arc section along the circumferential direction of the fixed pipe, and the straight section is used for installing the bearing support 4. The straight section can more firmly and conveniently install the bearing support 4. In-process of burying formula heating power pipeline and installing, the straight section can be convenient for constructor adjusts fixed pipe 2 in ascending position in week to guarantee that bearing support 4 is located parent tube 1 under. The upper surface of the support tile 41 is preferably laminated with the outer surface of the base pipe 1 to realize stably supporting the base pipe 1, the straight section of the fixed pipe 2 can ensure that the support 4 supports the base pipe 1 more stably, and the base pipe 1 is prevented from deviating and sliding down from the support 4.

The distance that directly buries formula heating power pipeline and lay in the heat supply pipe network is generally very long, and the power that parent tube 1 of directly burying formula heating power pipeline received at the in-process of carrying the heating medium has: the base pipe 1 is internally pressed to generate circumferential stress and axial stress, temperature difference stress caused by temperature difference change and constraint counterforce of soil to the buried heat distribution pipeline. Fig. 2 is a schematic structural diagram of a direct buried thermal pipeline in another embodiment of the present invention. In order to support and fix the direct-buried heat distribution pipeline in the heat supply pipe network and improve the stability of the direct-buried heat distribution pipeline, the direct-buried heat distribution pipeline has the structure shown in fig. 2, and further comprises an anchoring ring 7 which is sleeved outside the composite heat preservation pipe 3. The anchoring ring 7 is of a reinforced concrete structure. Meanwhile, in order to further reinforce the structure of the direct-buried heat distribution pipeline, a reinforcing rib 6 is arranged between the anchoring ring 7 and the fixed pipe 2, one end of the reinforcing rib 6 is connected with the inner wall of the anchoring ring 7, and the other end of the reinforcing rib is connected with the outer wall of the fixed pipe 2. The quantity of strengthening rib 6 is a plurality of, and a plurality of strengthening ribs 6 set up along the equidistant interval of fixed pipe 2 circumference to make each strengthening rib 6 and fixed pipe 2's each position atress more even. In the whole heating pipe network, the number of the anchoring rings 7 is multiple, and the anchoring rings 7 are arranged at intervals along the axial direction of the fixed pipe 2. The inventor obtains that the length of each anchoring ring 7 along the axial direction of the fixed pipe 2 is 0.6-2 m, and the axial spacing distance of any two adjacent segments of anchoring rings 7 along the fixed pipe 2 is 80-120 m after the stress analysis is carried out on the buried heat distribution pipeline. When the direct-buried heat distribution pipeline in the heat supply pipe network is arranged according to the mode, the structure of the direct-buried heat distribution pipeline is stable, and the service life is greatly prolonged.

The concrete structure of the composite heat-insulating pipe 3 is as follows: the heat reflection pipe comprises a heat reflection pipe 31 which is sleeved outside a fixed pipe 2 in a matching mode, a resin protection pipe 32 which is sleeved outside the heat reflection pipe, and a foam plastic layer 33 which is filled between the heat reflection pipe 31 and the resin protection pipe 32. The resin protection pipe 32 is preferably made of polyurethane or polyethylene, the plastic foam layer 33 is preferably made of hard polyurethane foam, and the heat reflection pipe 31 is preferably made of aluminum foil. The foam plastic layer 33 plays a main heat preservation role for the heat supply medium in the base pipe 1, the resin protection pipe 32 is used for the heat preservation foam plastic layer, and the heat reflection pipe 31 plays an auxiliary heat preservation role for the heat radiation effect of the heat supply medium in the base pipe 1. Through the arrangement, the on-way heat dissipation loss of the heat supply medium flowing in the direct-buried heat distribution pipeline can be greatly reduced, and the heat supply energy consumption is obviously reduced. The heat reflection pipe 31 is matched with the sleeve and is arranged on the fixed pipe 2, so that the heat reflection pipe also comprises a straight section and an arc section along the circumferential direction, the combined type heat preservation pipe 3 is tightly attached to the fixed pipe 2 due to the arrangement, and a better heat preservation effect can be achieved.

In addition, the direct-buried heat distribution pipeline is particularly suitable for frozen soil areas, and the soil structure of the frozen soil areas can generate frost heaving and fusion sinking phenomena along with the change of seasons, so that the resin protection pipe of the traditional direct-buried heat distribution pipeline can be seriously damaged, and the heat insulation structure is damaged from the outside. In addition, the insulation structure of the conventional direct burial thermal pipe is damaged due to the deformation of the substrate tube 1. Therefore, if the traditional direct-buried heat distribution pipeline is laid in the frozen soil area, the damaged speed of the heat insulation structure is rapidly accelerated under the dual effects of the inside and the outside of the composite heat insulation pipe 3 and the damage to the composite heat insulation pipe, so that the service life of the traditional direct-buried heat distribution pipeline in the frozen soil area is short. The direct-buried heat distribution pipeline is applied to the frozen soil area, the damage of the deformation of the base pipe 1 to the composite heat insulation pipe 3 is reduced, the service life of the direct-buried heat distribution pipeline in the frozen soil area can be prolonged to a certain extent, and the direct-buried heat distribution pipeline has better economic performance.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.

In this application, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral combinations thereof; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. A direct-buried thermal conduit, comprising:

a base pipe;

the fixed tube is sleeved outside the base tube;

the composite heat-insulating pipe is sleeved outside the fixed pipe;

the supporting support is arranged between the fixed pipe and the base pipe;

the elastic supporting component is arranged between the fixed pipe and the base pipe, surrounds the base pipe together with the bearing support in a spaced mode, and can absorb the deformation of the base pipe through the elastic deformation of the elastic supporting component; the elastic support assembly includes: a first elastic support member which is opposed to the holder support and which applies an opposing force to the base pipe together with the holder support; a second elastic support member located between the bearer support and the first elastic support member in a circumferential direction of the base pipe; a third elastic support member which is opposite to the second elastic support member and applies an opposite acting force to the base pipe together with the second elastic support member;

the elastic support component is an arc-shaped elastic sheet buckled on the inner wall of the fixed pipe so that the outer arc surface abuts against the base pipe.

2. The direct burial thermal pipe of claim 1, wherein the arc-shaped elastic sheet is made of spring steel, and the radius of the arc-shaped elastic sheet is 1/8-1/3 of the inner radius of the base pipe; the arc length of the arc-shaped elastic sheet is 1/5-2/3 of the inner circumference of the base pipe.

3. A buried thermal pipeline as claimed in claim 1 or claim 2 wherein the bearer support includes a shoe for supporting the base pipe and a support bar for connecting the shoe to a fixed pipe.

4. A buried thermal pipeline as in claim 1 where the fixed pipe includes a straight section and a circular arc section along its circumference, the straight section being used to mount the support pedestal.

5. A buried thermal pipeline as claimed in claim 1 or 2, further comprising a plurality of support units consisting of said first, second and third resilient support members and a standoff, said plurality of support units being sequentially spaced along the axis of said base pipe.

6. The direct-buried thermal pipeline according to claim 5, further comprising an anchoring ring sleeved outside the composite heat-insulating pipe, wherein a reinforcing rib is disposed between the anchoring ring and the fixed pipe, one end of the reinforcing rib is connected to an inner wall of the anchoring ring, and the other end of the reinforcing rib is connected to an outer wall of the fixed pipe; the number of the reinforcing ribs is multiple, and the plurality of reinforcing ribs are arranged at equal intervals along the circumferential direction of the fixing pipe.

7. The direct-buried thermal pipeline according to claim 1, 2 or 4, wherein the composite thermal insulation pipe comprises a heat reflection pipe sleeved outside the fixed pipe in a matching manner, a resin protection pipe sleeved outside the heat reflection pipe, and a foam plastic layer filled between the heat reflection pipe and the resin protection pipe.

8. A direct burial thermal conduit as claimed in claim 1 or 2, wherein the fixed pipe is a steel pipe.