阅读说明：本技术 一种火电厂锅炉减温水喷淋管道保温结构 (Thermal power plant boiler cooling water sprays pipeline insulation construction ) 是由 谢晶 陈惠林 肖甜 朱松鹤 于 2021-07-31 设计创作，主要内容包括：本发明公开了一种火电厂锅炉减温水喷淋管道保温结构,此管道保温结构包括喷淋单元和保温单元,其中,喷淋单元,其包括供水管道和设置于所述供水管道中且数量不小于的雾化喷嘴；保温单元,套设于所述喷淋单元的外侧壁上,其包括内套管和外套管,所述外套管套设于所述内套管的外侧,且所述内套管和外套管之间设置有保温层；本发明中的喷淋单位用于锅炉的降温,其管道做统一管径处理,使得弯折及薄弱处的管壁更厚,以提高耐疲劳断裂的能力；保温单元套设于管道的外壁,其装配式结构不仅便于安装拆卸,而且便于维护。(The invention discloses a thermal insulation structure of a desuperheating water spray pipeline of a boiler of a thermal power plant, which comprises a spray unit and a thermal insulation unit, wherein the spray unit comprises a water supply pipeline and atomizing nozzles which are arranged in the water supply pipeline and are not less than the water supply pipeline in number; the heat preservation unit is sleeved on the outer side wall of the spraying unit and comprises an inner sleeve and an outer sleeve, the outer sleeve is sleeved on the outer side of the inner sleeve, and a heat preservation layer is arranged between the inner sleeve and the outer sleeve; the spraying unit is used for cooling the boiler, and the pipelines are subjected to uniform pipe diameter treatment, so that the pipe wall at the bent and weak position is thicker, and the fatigue fracture resistance is improved; the outer wall of pipeline is located to the unit cover that keeps warm, and its assembled structure is convenient for not only the installation dismantlement, is convenient for maintain moreover.)

1. The utility model provides a boiler desuperheating water spray piping insulation construction of thermal power plant which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,

a spray unit (100) comprising a water supply pipeline (101) and atomizing nozzles (102) which are arranged in the water supply pipeline (101) and have the number not less than 1;

the heat preservation unit (200) is sleeved on the outer side wall of the spraying unit (100) and comprises an inner sleeve (201) and an outer sleeve (202), the outer sleeve (202) is sleeved on the outer side of the inner sleeve (201), and a heat preservation layer (203) is arranged between the inner sleeve (201) and the outer sleeve (202).

2. The heat insulation structure for the desuperheating water spray pipeline of the thermal power plant boiler according to claim 1, characterized in that: the outer side wall of the water supply pipeline (101) is the same in pipe diameter size, a mounting hole (101a) is formed in the side wall of the water supply pipeline, and the mounting hole (101a) is communicated with the inner cavity of the water supply pipeline (101).

3. The heat insulation structure for the desuperheating water spray pipeline of the thermal power plant boiler according to claim 2, characterized in that: the atomizing nozzle (102) comprises a nozzle base (102a) arranged in the mounting hole (101a), a spray head (102b) arranged in the nozzle base (102a) and a distribution plate (102c) arranged at the lower end of the spray head (102 b); wherein the content of the first and second substances,

the spray head (102b) is communicated with the inner cavity of the water supply pipeline (101) through the distribution plate (102 c).

4. The thermal insulation structure for the temperature-reducing water spray pipeline of the thermal power plant boiler according to any one of claims 1 to 3, characterized in that: the inner sleeve (201) comprises an inner tube body (201a), an end ring (201b) and a segmented ring (201c) which are arranged on the side wall of the inner tube body (201a), and a separation plate (201d) which is arranged between the end ring (201b) and the segmented ring (201c) and between the adjacent segmented rings (201 c); wherein the content of the first and second substances,

the distances between the end ring (201b) and the segmented ring (201c) and between the adjacent segmented rings (201c) are the same;

the partition plates (201d) are provided with a plurality of groups and are distributed at equal intervals, and a placing groove (F) is formed between every two adjacent partition plates (201d) and every two adjacent segment rings (201 c).

5. The reduced-temperature water spray pipeline insulation structure for a thermal power plant boiler according to claim 4, characterized in that: a through cavity (M) is arranged in the inner cavity of the sectional ring (201c), an inner through hole (201c-1) is arranged on the inner side wall of the through cavity, and an outer through hole (201c-2) is arranged on the outer side wall of the through cavity; wherein the content of the first and second substances,

the inner through holes (201c-1) are distributed at equal intervals, and the section ring (201c) is communicated with the inner cavity of the inner tube body (201a) through the inner through holes (201 c-1);

the outer perforations (201c-2) have a plurality of groups, are distributed at equal intervals, and the section ring (201c) is communicated with the outer side of the inner pipe body (201a) through the outer perforations (201 c-2).

6. The heat insulation structure for the desuperheating water spray pipeline of the thermal power plant boiler according to claim 5, characterized in that: the inner through holes (201c-1) and the outer through holes (201c-2) are alternately distributed at equal intervals, balls (S) are arranged in the inner through holes and the outer through holes in a rolling mode, and the edges of the balls (S) protrude out of the inner through holes (201c-1) and the outer through holes (201 c-2).

7. The heat insulation structure for the desuperheating water spray pipeline of the thermal power plant boiler according to claim 6, characterized in that: the ball (S) located in the inner through hole (201c-1) can be matched and rolled on the outer side wall of the water supply pipeline (101);

the balls (S) located in the outer through holes (201c-2) can be matched and rolled on the inner side wall of the outer sleeve (202).

8. The thermal insulation structure for the temperature-reducing water spray pipeline of the thermal power plant boiler according to any one of claims 5 to 7, characterized in that: the inner sleeve (201) further comprises a connecting end disc (201e), and the connecting end disc (201e) is positioned on one end side wall of the inner tube body (201 a);

the side wall of the connecting end disc (201e) connected with the inner pipe body (201a) is provided with an inserting groove (201e-1), and the other side of the connecting end disc is provided with an inserting convex ring (201 e-2);

the end part of the outer sleeve (202) can be matched and plugged into the plugging groove (201 e-1).

9. The heat insulation structure for the desuperheating water spray pipeline of the thermal power plant boiler according to claim 8, characterized in that: the end of the outer sleeve (202) is provided with a matching disc (202a), and the side of the matching disc (202a) far away from the outer sleeve (202) is provided with a matching groove (202 b);

the inserting convex ring (201e-2) can be inserted into the matching groove (202b) in a matching mode.

10. The thermal insulation structure for the temperature-reducing water spray pipeline of the thermal power plant boiler according to any one of claims 5 to 7, characterized in that: the heat insulation layer (203) comprises a plurality of groups of heat insulation blocks (203a), and the heat insulation blocks (203a) can be laid in the placing grooves (F).

Technical Field

The invention relates to the technical field of protection of boiler cooling equipment, in particular to a heat preservation structure of a desuperheating water spray pipeline of a boiler in a thermal power plant.

Background

At present, the purpose of controlling steam temperature is achieved by generally adopting water spraying to reduce temperature through a boiler superheater and a boiler reheater of a thermal power plant, and the steam-temperature-regulating boiler has the advantages of large temperature regulating range, rapid cooling, simple structure and capability of realizing automation. The pipeline and the nozzle of the temperature-reducing water spraying system are close to the superheater and the reheater of the boiler, the exterior of the pipeline and the nozzle are in a high-temperature environment for a long time, and the temperature-reducing water with low temperature flows in the pipeline. The thermal cycle stress action that cold and hot alternation caused makes the interior outer wall of cooling water pipe all can produce hot fatigue crack, and the fatigue crack's extension has been aggravated to the cooling water mode of putting into operation of sudden start sudden stop.

Especially to the junction that the pipe diameter thickness is different, because the sudden change reason of pipe diameter size can produce mechanical fatigue damage until the fracture inefficacy in same position, inlet tube external diameter sudden change department and the structure sudden change department fracture of inlet channel and nozzle base promptly, and the production of fatigue crack also can't be avoided to upgrading pipeline and nozzle material.

Further, accidents caused by damage and breakage of the pipes and nozzles are serious, and the cost for maintenance of the pipes is too high due to maintenance downtime, and thus, it is necessary to improve the situation.

Disclosure of Invention

This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.

The invention is provided in view of the problem of fatigue fracture of the existing boiler desuperheating water spray pipeline of the thermal power plant.

Therefore, the invention aims to provide a thermal insulation structure of a temperature-reducing water spraying pipeline of a boiler of a thermal power plant, and aims to solve the problem that fatigue fracture is easily caused when a temperature-reducing water pipe is in a cold-hot alternating environment for a long time.

In order to solve the technical problems, the invention provides the following technical scheme: a thermal insulation structure of a temperature-reducing water spraying pipeline of a boiler in a thermal power plant comprises a spraying unit and a thermal insulation unit, wherein the spraying unit comprises a water supply pipeline and atomizing nozzles which are arranged in the water supply pipeline and are not less than the spraying unit; the heat preservation unit is located on the lateral wall of the spraying unit in a sleeved mode, and comprises an inner sleeve and an outer sleeve, the outer sleeve is located on the outer side of the inner sleeve, and a heat preservation layer is arranged between the inner sleeve and the outer sleeve.

The outer side wall of the water supply pipeline is the same in pipe diameter size, a mounting hole is formed in the side wall of the water supply pipeline, and the mounting hole is communicated with the inner cavity of the water supply pipeline.

The atomizing nozzle comprises a nozzle seat arranged in the mounting hole, a nozzle arranged in the nozzle seat and a distribution plate arranged at the lower end of the nozzle; wherein, the spray head is communicated with the inner cavity of the water supply pipeline through the distribution plate.

As an optimal scheme of the heat preservation structure of the desuperheating water spray pipeline of the boiler of the thermal power plant, the invention comprises the following steps: the inner sleeve comprises an inner tube body, end rings and segmented rings arranged on the side wall of the inner tube body, and partition plates arranged between the end rings and the segmented rings and between the adjacent segmented rings; wherein the end rings and the segmented rings and the adjacent segmented rings have the same spacing; the partition plates are provided with a plurality of groups and are distributed at equal intervals, and a placing groove is formed between every two adjacent partition plates and the segment rings.

As an optimal scheme of the heat preservation structure of the desuperheating water spray pipeline of the boiler of the thermal power plant, the invention comprises the following steps: a through cavity is formed in the inner cavity of the segmented ring, an inner through hole is formed in the inner side wall of the segmented ring, and an outer through hole is formed in the outer side wall of the segmented ring; the inner through holes are distributed at equal intervals, and the section rings are communicated with the inner cavity of the inner pipe body through the inner through holes; the outer perforation has a plurality of groups, and the equal interval distributes, and the pitch ring passes through outer perforation and communicates with each other outside with interior body.

As an optimal scheme of the heat preservation structure of the desuperheating water spray pipeline of the boiler of the thermal power plant, the invention comprises the following steps: the inner through holes and the outer through holes are alternately distributed at equal intervals, balls are arranged in the inner through holes and the outer through holes in a rolling mode, and the edges of the balls protrude out of the inner through holes and the outer through holes.

As an optimal scheme of the heat preservation structure of the desuperheating water spray pipeline of the boiler of the thermal power plant, the invention comprises the following steps: the ball bearing positioned in the inner through hole can be matched and rolled on the outer side wall of the water supply pipeline; the ball bearing positioned in the outer through hole can roll on the inner side wall of the outer sleeve in a matched mode.

As an optimal scheme of the heat preservation structure of the desuperheating water spray pipeline of the boiler of the thermal power plant, the invention comprises the following steps: the inner sleeve also comprises a connecting end disc which is positioned on the side wall of one end of the inner tube body; the side wall of the connecting end disc connected with the inner pipe body is provided with an inserting groove, the other side of the connecting end disc is provided with an inserting convex ring, and the end part of the outer sleeve can be inserted into the inserting groove in a matching mode.

As an optimal scheme of the heat preservation structure of the desuperheating water spray pipeline of the boiler of the thermal power plant, the invention comprises the following steps: the end part of the outer sleeve is provided with a matching disc, and one side of the matching disc, which is far away from the outer sleeve, is provided with a matching groove; the inserting convex ring can be inserted into the matching groove in a matching mode.

As an optimal scheme of the heat preservation structure of the desuperheating water spray pipeline of the boiler of the thermal power plant, the invention comprises the following steps: the heat preservation includes a plurality of groups of heat preservation piece, the heat preservation piece can lay in each the standing groove.

The invention has the beneficial effects that:

the spraying unit is used for cooling the boiler, and the pipelines are subjected to uniform pipe diameter treatment, so that the pipe wall at the bent and weak position is thicker, and the fatigue fracture resistance is improved; the outer wall of pipeline is located to the unit cover that keeps warm, and its assembled structure is convenient for not only the installation dismantlement, is convenient for maintain moreover.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:

FIG. 1 is a schematic view of the overall structure of the heat preservation structure of the desuperheating water spray pipeline of the boiler of the thermal power plant.

FIG. 2 is a schematic diagram of an overall half-section structure of the heat preservation structure of the desuperheating water spray pipeline of the boiler of the thermal power plant.

FIG. 3 is a schematic structural view of a sleeve assembly of the heat preservation structure of the desuperheating water spray pipeline of the boiler of the thermal power plant.

Fig. 4 is a concrete structural schematic diagram of an inner sleeve of the heat preservation structure of the desuperheating water spray pipeline of the boiler of the thermal power plant.

FIG. 5 is a schematic plan view of a cross-sectional structure of the whole A-A surface of the attemperation water spray pipeline insulation structure of the boiler of the thermal power plant.

FIG. 6 is a schematic plane view of a cross-sectional structure of the whole B-B surface of the attemperation water spray pipeline insulation structure of the boiler of the thermal power plant.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

Furthermore, the present invention is described in detail with reference to the drawings, and in the detailed description of the embodiments of the present invention, the cross-sectional view illustrating the structure of the device is not enlarged partially according to the general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.

Example 1

Referring to fig. 1 and 2, in a first embodiment of the present invention, there is provided a heat preservation structure of a spray pipe for desuperheating water of a boiler of a thermal power plant, the heat preservation structure including a spray unit 100 and a heat preservation unit 200. The spraying unit 100 is a pipeline structure forming a spraying system and is used for temperature regulation of a boiler superheater and a boiler reheater; the heat preservation unit 200 is used for heat insulation of the pipeline structure of the spraying system, so that fatigue cracks of the pipeline caused by the fact that the inside and the outside of the pipeline structure are in the environment of high temperature outside the pipeline and low temperature inside the pipeline in alternating cold and hot states for a long time are reduced.

Specifically, the spraying unit 100 comprises a water supply pipeline 101 and atomizing nozzles 102 which are arranged in the water supply pipeline 101 and the number of which is not less than 1; the water supply pipeline 101 is used for guiding low-temperature desuperheating water pumped by an external feed water pump to enter the atomizing nozzle 102, and the desuperheating water is atomized by the atomizing nozzle 102 and then sprayed into a superheater or a reheater of the boiler.

The heat preservation unit 200 is sleeved on the outer side wall of the spraying unit 100 and comprises an inner sleeve 201 and an outer sleeve 202, the outer sleeve 202 is sleeved outside the inner sleeve 201, and a heat preservation layer 203 is arranged between the inner sleeve 201 and the outer sleeve 202; the heat preservation unit 200 is integrally sleeved outside the spraying unit 100, more specifically outside the water supply pipeline 101, wherein the outer sleeve 202 is located outside the inner sleeve 201, a heat preservation separation chamber is formed between the outer sleeve and the inner sleeve, and a heat preservation layer 203 for heat preservation is arranged between the outer sleeve and the inner sleeve.

Example 2

Referring to fig. 2, a second embodiment of the present invention, which is different from the first embodiment, is: the outer side wall of the water supply pipeline 101 has the same diameter, and a mounting hole 101a is opened in the side wall of the water supply pipeline, and the mounting hole 101a is communicated with the inner cavity of the water supply pipeline 101.

The atomizing nozzle 102 includes a nozzle base 102a installed in the mounting hole 101a, a head 102b disposed in the nozzle base 102a, and a distribution plate 102c disposed at a lower end of the head 102 b; wherein the spray head 102b is communicated with the inner cavity of the water supply pipeline 101 through the distribution plate 102 c.

Compare in embodiment 1, it is further, in view of current water supply pipeline in different positions, and set up the pipeline of different pipe diameters when being connected with atomizing nozzle 102, form the connection structure weak area more than this condition, handle fatigue crack under the environment of cold and hot alternation, and then the condition of fracture damage appears, set water supply pipeline 101 to the outer pipe diameter structure of uniform size in this scheme, the pipe wall thickness of original bending zone and structure sudden change department has been thickened promptly, this sets up and not only can improve structural strength, make body appearance structure level and smooth, and can reduce the stress concentration of structure sudden change department, improve the fatigue resistance ability of body.

The installation hole 101a that the lateral wall of water supply pipe 101 was seted up is used for installing atomizing nozzle 102, and atomizing nozzle 102 spouts into in the boiler superheater and the reheater after atomizing the temperature reduction water in the pipeline.

Further, the atomizing nozzle 102 includes a nozzle base 101a having a nozzle head 101b in a side wall thereof for atomizing the temperature-reduced water, and a water inlet end of the nozzle head 101b has a distribution plate 102c for partitioning the temperature-reduced water introduced into the nozzle head 101b into each nozzle opening.

The rest of the structure is the same as that of embodiment 1.

Example 3

Referring to fig. 2 to 6, a third embodiment of the present invention is different from the second embodiment in that: the inner tube 201 includes an inner tube 201a, end rings 201b and segmented rings 201c provided on the sidewalls of the inner tube 201a, and partition plates 201d provided between the end rings 201b and the segmented rings 201c and between the adjacent segmented rings 201 c; wherein, the distances between the end ring 201b and the segmented ring 201c and between the adjacent segmented rings 201c are the same; the partition plates 201d are provided with a plurality of groups and are distributed at equal intervals, and a placing groove F is formed between the adjacent partition plates 201d and the segment rings 201 c.

A through cavity M is arranged in the inner cavity of the sectional ring 201c, an inner through hole 201c-1 is arranged on the inner side wall of the through cavity M, and an outer through hole 201c-2 is arranged on the outer side wall of the through cavity M; the inner through holes 201c-1 are provided with a plurality of groups and are distributed at equal intervals, and the section rings 201c are communicated with the inner cavity of the inner tube body 201a through the inner through holes 201 c-1; the outer penetration holes 201c-2 have a plurality of groups, which are equally spaced, and the segmented ring 201c is communicated with the outside of the inner tube 201a through the outer penetration holes 201 c-2.

The inner through holes 201c-1 and the outer through holes 201c-2 are alternately distributed at equal intervals, balls S are arranged in the inner through holes and the outer through holes in a rolling mode, and the edges of the balls S protrude out of the inner through holes 201c-1 and the outer through holes 201 c-2.

The ball S in the inner through hole 201c-1 can roll on the outer side wall of the water supply pipeline 101 in a matching way; the balls S located in the outer through holes 201c-2 can be fitted to roll on the inner side wall of the outer sleeve 202.

The inner sleeve 201 further comprises a connecting end disc 201e, and the connecting end disc 201e is positioned on one end side wall of the inner tube body 201 a; the side wall of the connecting end disc 201e connected with the inner tube 201a is provided with an insertion groove 201e-1, the other side of the connecting end disc is provided with an insertion convex ring 201e-2, and the end part of the outer sleeve 202 can be inserted into the insertion groove 201e-1 in a matching manner.

The end of the outer sleeve 202 is provided with a matching disc 202a, and the side of the matching disc 202a far away from the outer sleeve 202 is provided with a matching groove 202 b; the insertion convex ring 201e-2 can be inserted into the fitting groove 202b in a fitting manner.

The insulating layer 203 comprises a plurality of groups of insulating blocks 203a, and the insulating blocks 203a can be laid in the placing grooves F.

Compared with the embodiment 2, further, the inner pipe 201a is an inner pipe directly sleeved on the outer side wall of the water supply pipeline 101, and the main body of the inner pipe is an inner pipe 201a, and the outer side wall of the inner pipe 201a is provided with an end ring 201b and a segmented ring 201c, wherein the end ring 201b is located at the end of the inner pipe 201a, the segmented rings 201c are equally spaced between the end ring 201b and a connecting end disc 201e, and separation plates 201d are arranged in the spaces between the end ring 201b and the segmented rings 201c and between adjacent segmented rings 201c for differentiating and forming respective placement grooves F, and the placement grooves F are used for installing respective insulating layers 203.

Furthermore, the segmented ring 201c is annularly formed in the side wall of the inner sleeve 201a, the outer diameter of the tube body of the segmented ring is larger than that of the tube body of the inner sleeve 201a, the inner cavity of the side wall of the ring body is hollow, an annular through cavity M is formed, the inner through hole 201c-1 is formed in the side wall of the inner ring, the outer through hole 201c-2 is formed in the side wall of the outer ring, multiple groups of inner through holes 201c-1 and outer through holes 201c-2 are arranged, and the inner through holes and the outer through holes are alternately distributed;

balls S are arranged in the inner through hole 201c-1 and the outer through hole 201c-2, and the edge of each ball S protrudes out of the hole cavity; further, the ball S located in the inner through hole 201c-1 can be engaged and rolled on the outer side wall of the water supply pipeline 101; the balls S located in the outer through holes 201c-2 can be fitted to roll on the inner side wall of the outer sleeve 202. That is, the inner tube 201a can be roll-fitted to the outer side wall of the water supply pipe 101 through the balls S in the inner through-holes 201c-1, and the outer tube 202 can be roll-fitted to the outer side wall of the inner tube 201a through the balls S in the outer through-holes 201 c-2. The rolling of the balls S enables a considerable reduction in the resistance to the fitting or removal of the sleeve and enables the formation of an annular compartment at one end between the water supply pipe 101 and the inner sleeve 201a, and between the inner sleeve 201a and the outer sleeve 202, respectively. And heat insulation gas is introduced into the separation cavity, so that the heat insulation performance of the heat insulation structure can be further improved.

One end of the inner tube 201a is further provided with a connecting end disc 201e, one side wall of the connecting end disc 201e is provided with an insertion groove 201e-1, and the other side wall is provided with an insertion convex ring 201e-2, wherein the insertion groove 201e-1 is used for insertion fit with the free end of the outer sleeve 202 to maintain the connection between the inner sleeve 201 and the outer sleeve 202, so as to form an effective separation cavity. It should be noted that, the end of the outer sleeve 202 connected to the insertion groove 201e-1 may be provided with a sealing gasket to improve the heat insulation of the compartment.

Furthermore, a matching groove 202b is formed in one side wall of a matching disc 202a at the end of the outer sleeve 202, and an insertion convex ring 201e-2 at the end of the adjacent inner sleeve 201 can be inserted into the matching groove 202b in a matching manner to form connection between the end of the inner sleeve 201 and the end of the outer sleeve 202, and then, the inner sleeve 201 and the outer sleeve 202 are stably connected on the side wall of the connecting end of the inner sleeve 201 and the outer sleeve 202 through bolts or other clamping pieces, so that the combination of each section of the inner sleeve 201 and the outer sleeve 202 can be connected, and a complete heat-preservation sleeve structure is laid.

Furthermore, the heat insulation blocks 203a are laid in the placing groove F, the sectional installation operation and the subsequent replacement of heat insulation materials are simpler and more convenient, and the heat insulation blocks 203a are continuously laid in the placing groove F to form a continuous heat insulation layer 203. Preferably, the heat-insulating block 203a is made of heat-insulating material, can be aerogel felt, is a porous material with nano-scale pore size, and has the characteristics of light weight and good heat-insulating and heat-preserving effects.

The rest of the structure is the same as that of embodiment 2.

As shown in fig. 1 to 6, in the installation process of the thermal insulation unit 200, one end of the water supply pipeline 101 connected to the whole body is required to be opened, so as to sleeve each segmented pipe assembly (the combination of the inner pipe 201 and the outer pipe 202) on the outer side wall of the water supply pipeline 101, when installing a single pipe assembly: firstly, the inner sleeve 201 is sleeved on a preset water supply pipeline 101, balls S in the inner through holes 201c-1 can be easily pushed, then uniform heat preservation blocks 203a are laid in each placing groove F, after the laying is finished, the outer sleeve 202 is sleeved on the outer side wall of the inner sleeve 201 from one side, far away from the connecting end disc 201e, of the inner sleeve 201, and the outer sleeve 202 can be easily pushed due to the balls S in the outer through holes 201c-2 until the free section of the outer sleeve 202 is finally matched and inserted in the insertion groove 201e-1 on the connecting end disc 201e of the inner sleeve 201, so that the sleeve components are combined into a whole. And then, continuing to install the next sleeve assembly, wherein when the inner sleeve 201 is sleeved first, the insertion convex ring 201e-2 on the connection end disc 201e at the end part of the inner tube body 201a can be connected in a matching groove 202b at the end part of the outer sleeve 202 in a matching way, and the end parts of the sleeve assemblies are connected by an external fixing component, such as a bolt and nut structure.

The above installation process is repeated to extend the thermal insulation structure installed on the water supply pipeline 101. Preferably, to facilitate later maintenance, after each certain length, a node of a length of the sleeve assembly is provided to prepare for later maintenance or replacement of the heat-insulating block 203a, that is, to place a spare sleeve assembly.

It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.