CN111998176A - Prefabricated steam heat-insulating pipe with composite heat-insulating structure and manufacturing process thereof - Google Patents
Prefabricated steam heat-insulating pipe with composite heat-insulating structure and manufacturing process thereof Download PDFInfo
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- CN111998176A CN111998176A CN202010870590.9A CN202010870590A CN111998176A CN 111998176 A CN111998176 A CN 111998176A CN 202010870590 A CN202010870590 A CN 202010870590A CN 111998176 A CN111998176 A CN 111998176A
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- heat
- layer
- preservation
- foil layer
- pipe
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/028—Composition or method of fixing a thermally insulating material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/026—Mattresses, mats, blankets or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/029—Shape or form of insulating materials, with or without coverings integral with the insulating materials layered
Abstract
The application discloses prefabricated steam insulating tube of composite heat preservation structure and manufacturing process thereof relates to the field of heating power pipe network, and its structure includes that child pipe and cover locate the shell on the child pipe, and child pipe week side parcel has interior heat preservation tile layer, and interior heat preservation tile layer week side parcel has the cotton layer of heat preservation, and shell inner wall circumference is fixed with the foam blanket, and on the cotton layer of heat preservation was located to the foam blanket cover, both ends between child pipe and shell all were provided with the end seal portion. This application has the effect that alleviates steam insulation pipe weight, reduce cost.
Description
Technical Field
The application relates to the field of heating power pipe networks, in particular to a prefabricated steam heat-insulating pipe with a composite heat-insulating structure and a manufacturing process thereof.
Background
At present, steam heat preservation pipe wide application is in the industrial production field, especially in the industrial area, the heat power pipe network becomes indispensable supporting facility basically, along with, the demand of industrial development to steam pipe network increases, pipe network length develops more than 10Km, 20Km and even 30Km from 5Km, the pipe diameter increases to more than DN1000 from DN300, DN600, carry steam pipe quantity by one twenty tons (per hour) to one or two hundred tons, or even several hundred tons per hour, correspondingly, market has proposed the demand that weight is lighter, cost is lower to steam pipe network.
Disclosure of Invention
In order to reduce the weight of a heat supply network and reduce the cost, the application provides a prefabricated steam heat-insulating pipe with a composite heat-insulating structure and a manufacturing process thereof.
The application provides a pair of prefabricated steam insulating tube of composite heat preservation structure adopts following technical scheme:
the utility model provides a prefabricated steam insulating tube of composite insulation structure, locates including child pipe and cover shell on the child pipe, child pipe week side parcel has interior heat preservation tile layer, interior heat preservation tile layer week side parcel has the cotton layer of heat preservation, shell inner wall circumference is fixed with the foam blanket, the foam blanket cover is located on the cotton layer of heat preservation, the child pipe with both ends between the shell all are provided with the end seal portion.
By adopting the technical scheme, the problem that the heat-insulation cotton is easy to be pulverized when being in an environment of 250 ℃ for a long time, and then the heat-insulation cotton is ineffective is solved, and the temperature of the inner wall of the heat-insulation cotton layer is favorably reduced by arranging the inner heat-insulation tile layer, so that the heat-insulation cotton layer can normally exert heat-insulation performance; the heat insulation cotton layer has the advantages of fluffy structure, strong heat insulation performance and low cost, and the heat insulation cotton layer is arranged between the shell with the same pipe diameter and the tube, so that the weight and the production cost of the steam heat insulation pipe can be effectively reduced.
Preferably, the side of the heat preservation cotton layer is wrapped by an inner aluminum foil layer, the heat preservation cotton layer is provided with an outer aluminum foil layer between the inner aluminum foil layer, the inner aluminum foil layer is provided with an annular gap between the outer aluminum foil layers, and the smooth surface of the inner aluminum foil layer is opposite to the smooth surface of the outer aluminum foil layer.
By adopting the technical scheme, the annular gap is arranged for forming an air layer, so that the heat conduction effect is greatly reduced, and the temperature performance is improved; in addition, heat radiation infinitely reflects in the annular gap, is difficult for launching away to further improve the thermal insulation performance of this application.
Preferably, a convex bubble is arranged in the annular gap, and the outer curved surface of the convex bubble is connected with the inner aluminum foil layer or the outer aluminum foil layer in a propping manner.
By adopting the technical scheme, firstly, the convex bubbles are supported between the inner aluminum foil layer and the outer aluminum foil layer, so that the existence of an annular gap is ensured; and secondly, the heat insulation cotton layer wrapped on the tire tube has a certain self weight, and the convex bubbles play a role in supporting the heat insulation cotton layer, so that the heat insulation cotton layer is prevented from collapsing to a certain extent.
Preferably, the inner aluminum foil layer and/or the outer aluminum foil layer are integrally provided with the convex bubbles.
Through adopting above-mentioned technical scheme, be convenient for this application to accomplish manufacturing.
Preferably, the outer aluminum foil layer is fixed on the inner wall of the foam layer, and the outer shell is fixed on the outer wall of the foam layer.
Through adopting above-mentioned technical scheme, improve this application inner structure's relative stability, overall stability is stronger.
Preferably, an outer heat-insulating tile layer is circumferentially fixed on the inner wall of the foam layer, and the outer aluminum foil layer is fixed on the inner wall of the outer heat-insulating tile layer.
Through adopting above-mentioned technical scheme, add the heat preservation shingle, increase the intensity of shell, prevent effectively that the shell from causing personnel to trample and cave in.
The application provides a manufacturing process of prefabricated steam insulating tube of composite heat preservation structure adopts following technical scheme:
a manufacturing process of a prefabricated steam heat-insulating pipe with a composite heat-insulating structure comprises the following steps,
s1, positioning the die tube, and facilitating demoulding treatment of the die tube;
s2, wrapping an outer aluminum foil layer on the periphery of the mold pipe, coaxially sleeving a shell on the outer aluminum foil layer and the mold pipe, performing foaming operation between the shell and the outer aluminum foil layer, and forming a foam layer after the foaming operation is completed;
s3, demolding, and taking down the shell, the foam layer and the outer aluminum foil layer from the mold pipe;
s4, positioning the tire tube, and wrapping a plurality of heat preservation tiles around the tire tube in a bundling manner to form an inner heat preservation tile layer;
s5, tightly binding a plurality of heat preservation cotton felts on the periphery of the inner heat preservation tile layer by using a binding belt to form a heat preservation cotton layer;
s6, covering the inner aluminum foil layer with convex bubbles on the periphery of the heat-preservation cotton layer in a virtual mode;
s7, inserting the inner aluminum foil layer, the heat-preservation cotton layer, the inner heat-preservation tile layer and the tire tube into the outer aluminum foil layer together, and drawing out a binding belt for tightly binding a plurality of heat-preservation cotton felts in an interference manner;
and S8, mounting an end sealing part.
By adopting the technical scheme, the problem that the heat-insulation cotton is easy to be pulverized when being in an environment of 250 ℃ for a long time, and then the heat-insulation cotton is ineffective is solved, and the temperature of the inner wall of the heat-insulation cotton layer is favorably reduced by arranging the inner heat-insulation tile layer, so that the heat-insulation cotton layer can normally exert heat-insulation performance; the heat insulation cotton layer has the advantages of fluffy structure, strong heat insulation performance and low cost, and the heat insulation cotton layer is arranged between the shell with the same pipe diameter and the tube, so that the weight and the production cost of the steam heat insulation pipe can be effectively reduced.
Preferably, in step S2, after wrapping the outer aluminum foil layer around the mold tube, bundling a plurality of insulation tiles around the outer aluminum foil layer to form an outer insulation tile layer, and then coaxially sleeving the outer insulation tile layer and the mold tube with the housing, performing a foaming operation between the housing and the outer insulation tile layer, and after the foaming operation is completed, forming a foam layer.
Through adopting above-mentioned technical scheme, add the heat preservation tile layer in the foam layer inner wall, increase the intensity of shell, prevent effectively that the shell from causing personnel to trample and cave in.
In summary, the present application includes at least one of the following beneficial technical effects:
the heat insulation cotton layer is arranged between the shell and the tube with the same diameter, and the weight and the production cost of the steam heat insulation tube are effectively reduced by utilizing the advantages of fluffy structure, strong heat insulation performance and low cost of the heat insulation cotton;
the inner heat-insulating tile layer is wrapped on the periphery of the tire tube, so that the temperature of the inner wall of the heat-insulating cotton layer is reduced, and the application is ensured to be suitable for conveying steam with the temperature higher than 250 ℃;
by arranging the convex bubbles, on one hand, the convex bubbles are supported between the inner aluminum foil layer and the outer aluminum foil layer to ensure the existence of an annular gap, and the convex bubbles are supported by point contact, so that heat conduction is effectively avoided, and the heat insulation performance is improved; on the other hand, the heat preservation cotton layer wrapped on the tube has a certain dead weight, the convex bubbles play a role in supporting the heat preservation cotton layer, and the heat preservation cotton layer is prevented from collapsing to a certain extent.
Drawings
Fig. 1 is a schematic structural view of a prefabricated steam insulation pipe with a composite insulation structure in embodiment 1 of the present application.
Fig. 2 is a sectional view taken along a-a in fig. 1.
Fig. 3 is a schematic structural view of a prefabricated steam insulation pipe with a composite insulation structure in embodiment 2 of the present application.
Description of reference numerals: 1. a tyre tube; 2. a housing; 3. an inner insulating tile layer; 4. a heat insulation cotton layer; 5. a foam layer; 6. an inner aluminum foil layer; 7. an outer aluminum foil layer; 8. an annular gap; 9. convex bubble; 10. an outer insulating tile layer; 11. an end seal.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
The embodiment of the application discloses a prefabricated steam heat-insulating pipe with a composite heat-insulating structure and a manufacturing process thereof.
Example 1:
referring to fig. 1, a prefabricated steam insulating tube of composite insulation structure, locate shell 2 on child pipe 1 including child pipe 1 and cover, child pipe 1 week side parcel has interior heat preservation tile layer 3, interior heat preservation tile layer 3 is tied up by polylith heat preservation tile and is formed, 3 week side parcels of interior heat preservation tile layer have heat preservation cotton layer 4, heat preservation cotton layer 4 is the cotton felt of glass, the thickness on heat preservation cotton layer 4 is less than 100mm, 2 inner wall circumference of shell are fixed with foam layer 5, foam layer 5's material is polyurethane, foam layer 5 covers locates on the heat preservation cotton layer 4. The heat insulation cotton layer 4 has the advantages of fluffy structure, strong heat insulation performance and low cost, and the heat insulation cotton layer 4 is arranged between the shell 2 and the tube 1 with the same pipe diameter, so that the whole weight and the production cost of the steam heat insulation pipe can be effectively reduced.
The inner wall of foam blanket 5 is fixed with outer aluminium foil layer 7, and the outer wall of foam blanket 5 is fixed with shell 2, in the production process, directly carries out the foaming operation between outer aluminium foil layer 7 and shell 2, forms 5 inside and outside walls of foam blanket and connects outer aluminium foil layer 7 and shell 2 respectively, improves this application overall structure's stability.
4 week side parcels on heat preservation cotton layer have interior aluminium foil layer 6, interior aluminium foil layer 6 is located outer aluminium foil layer 7 simultaneously, be provided with annular gap 8 between interior aluminium foil layer 6 and the outer aluminium foil layer 7, annular gap 8's thickness is 5mm-10mm, heat-conduction can effectively be avoided to the air bed in the annular gap 8, improve the thermal insulation performance of this application, interior aluminium foil layer 6's plain noodles sets up with outer aluminium foil layer 7's plain noodles relatively, during the use, the unlimited reflection in annular gap 8 of heat radiation, difficult transmission is gone out, thereby further improve the thermal insulation performance of this application. Both ends between the tire tube 1 and the shell 2 are provided with end sealing parts 11, the end sealing parts 11 are formed by stacking heat-insulating tiles, and the positions of the tire tube 1 and the shell 2 which are relatively concentric are fixed.
In the manufacturing process, a plurality of convex bubbles 9 are formed on the smooth surface of the inner aluminum foil layer 6 in a downward pressing forming mode, the top of the outer curved surface of each convex bubble 9 is abutted with the smooth surface of the outer aluminum foil layer 7 to realize two functions, wherein one function is that the convex bubbles 9 are supported between the inner aluminum foil layer 6 and the outer aluminum foil layer 7 to ensure the existence of an annular gap 8; secondly, the heat preservation cotton layer 4 wrapped on the tube 1 has a certain dead weight, and the convex bubbles 9 play a role in supporting the heat preservation cotton layer 4, so that the heat preservation cotton layer 4 is prevented from collapsing to a certain extent.
The implementation principle of the embodiment 1 is as follows: when the heat preservation type composite heat preservation pipe is used, hot steam is conveyed into the tire pipe 1, the inner heat preservation tile layer 3 forms a first heat preservation, the pulverization caused by overhigh temperature of the inner wall of the heat preservation cotton layer 4 is avoided while the heat preservation performance is exerted, the second heat preservation is formed on the heat preservation cotton layer 4, the third heat preservation is formed on the inner aluminum foil layer 6 and the outer aluminum foil layer 7, and the foam layer 5 serves as a fourth heat preservation, so that the heat preservation type composite heat preservation pipe is ensured to have enough heat preservation performance; wherein, adopt the insulation construction of cotton layer 4, interior aluminium foil layer 6 and outer aluminium foil layer 7 of heat preservation, ensure when effectively reducing weight, reduce cost, guaranteed better thermal insulation performance, this embodiment is particularly useful for in the heating power pipe network of well, high support and steam temperature greater than 250 ℃.
The manufacturing process of the prefabricated steam heat-insulating pipe with the composite heat-insulating structure comprises the following steps,
s1, positioning the die tube by the positioning tool, and facilitating demoulding of the die tube, wherein the specific processing mode is as follows: coating a sponge layer on the periphery of the die tube or coating graphite on the periphery of the die tube;
s2, wrapping an outer aluminum foil layer 7 on the periphery of the die tube, coaxially sleeving the outer aluminum foil layer 7 and the die tube with the shell 2, performing foaming operation between the shell 2 and the outer aluminum foil layer 7, and forming a foam layer 5 after the foaming operation is completed;
s3, demolding, and taking the shell 2, the foam layer 5 and the outer aluminum foil layer 7 off the mold tube together;
s4, positioning the tire tube 1, and wrapping a plurality of heat preservation tiles on the periphery of the tire tube 1 in a bundling manner to form an inner heat preservation tile layer 3;
s5, tightly binding a plurality of heat preservation cotton felts on the periphery of the inner heat preservation tile layer 3 by using a binding belt to form a heat preservation cotton layer 4, wherein the binding belt can be a silk ribbon;
s6, covering the inner aluminum foil layer 6 with the convex bubbles 9 on the peripheral side of the heat preservation cotton layer 4;
s7, inserting the inner aluminum foil layer 6, the heat-preservation cotton layer 4, the inner heat-preservation tile layer 3 and the tire tube 1 into the outer aluminum foil layer 7 together, drawing out a binding belt for tightly binding a plurality of heat-preservation cotton felts in an interference manner, and expanding the heat-preservation cotton layer 4 to enable the convex bubbles 9 to abut against the inner wall of the outer aluminum foil layer 7;
and S8, mounting the end sealing part 11.
Example 2:
referring to fig. 2, the present embodiment is different from embodiment 1 in that an insulation tile layer is circumferentially fixed to an inner wall of a foam layer 5, and an outer aluminum foil layer 7 is circumferentially fixed to an inner wall of the insulation tile layer.
The implementation principle of the embodiment 2 is as follows: compare in embodiment 1, implement 2 and add the heat preservation tile layer at 5 inner walls on foam blanket to the intensity of reinforcing shell 2 satisfies to avoid personnel to trample shell 2 in the low support pipe network, causes the sunken demand of shell 2, and this embodiment is particularly useful for in the heating power pipe network of low support and steam temperature greater than 250 ℃.
The manufacturing process of the prefabricated steam heat-insulating pipe with the composite heat-insulating structure comprises the following steps,
s1, positioning the die tube by the positioning tool, and facilitating demoulding of the die tube, wherein the specific processing mode is as follows: coating a sponge layer on the periphery of the die tube or coating graphite on the periphery of the die tube;
s2, wrapping an outer aluminum foil layer 7 on the periphery of a mould pipe, binding a plurality of heat-insulating tiles on the periphery of the outer aluminum foil layer 7 to form an outer heat-insulating tile layer 10, coaxially sleeving a shell 2 on the outer heat-insulating tile layer 10 and the mould pipe, performing foaming operation between the shell 2 and the outer heat-insulating tile layer 10, and forming a foam layer 5 after the foaming operation is completed;
s3, demolding, and taking the shell 2, the foam layer 5 and the outer aluminum foil layer 7 off the mold tube together;
s4, positioning the tire tube 1, and wrapping a plurality of heat preservation tiles on the periphery of the tire tube 1 in a bundling manner to form an inner heat preservation tile layer 3;
s5, tightly binding a plurality of heat preservation cotton felts on the periphery of the inner heat preservation tile layer 3 by using a binding belt to form a heat preservation cotton layer 4, wherein the binding belt can be a silk ribbon;
s6, covering the inner aluminum foil layer 6 with the convex bubbles 9 on the peripheral side of the heat preservation cotton layer 4;
s7, inserting the inner aluminum foil layer 6, the heat-preservation cotton layer 4, the inner heat-preservation tile layer 3 and the tire tube 1 into the outer aluminum foil layer 7 together, drawing out a binding belt for tightly binding a plurality of heat-preservation cotton felts in an interference manner, and expanding the heat-preservation cotton layer 4 to enable the convex bubbles 9 to abut against the inner wall of the outer aluminum foil layer 7;
and S8, mounting the end sealing part 11.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The utility model provides a prefabricated steam insulating tube of composite heat preservation structure, locates including child pipe (1) and cover shell (2) on child pipe (1), its characterized in that: child pipe (1) week side parcel has interior heat preservation tile layer (3), the parcel of interior heat preservation tile layer (3) week side has heat preservation cotton layer (4), shell (2) inner wall circumference is fixed with foam layer (5), foam layer (5) cover is located on the cotton layer (4) of heat preservation, child pipe (1) with both ends between shell (2) all are provided with end seal portion (11).
2. The prefabricated steam heat-preservation pipe with the composite heat-preservation structure as claimed in claim 1, is characterized in that: the parcel of week side of heat preservation cotton layer (4) is provided with interior aluminium foil layer (6), heat preservation cotton layer (4) with be provided with outer aluminium foil layer (7) between interior aluminium foil layer (6), interior aluminium foil layer (6) with be provided with annular gap (8) between outer aluminium foil layer (7), the plain noodles of interior aluminium foil layer (6) with the plain noodles of outer aluminium foil layer (7) sets up relatively.
3. The prefabricated steam heat-preservation pipe with the composite heat-preservation structure as claimed in claim 2, characterized in that: and a convex bubble (9) is arranged in the annular gap (8), and the outer curved surface of the convex bubble (9) is connected with the inner aluminum foil layer (6) or the outer aluminum foil layer (7) in a jacking way.
4. The prefabricated steam heat-preservation pipe with the composite heat-preservation structure as claimed in claim 3, is characterized in that: the inner aluminum foil layer (6) and/or the outer aluminum foil layer (7) are/is integrally provided with the convex bubbles (9).
5. The prefabricated steam heat-preservation pipe with the composite heat-preservation structure as claimed in claim 4, is characterized in that: the inner wall of the foam layer (5) is fixed with the outer aluminum foil layer (7), and the outer wall of the foam layer (5) is fixed with the shell (2).
6. The prefabricated steam heat-preservation pipe with the composite heat-preservation structure as claimed in claim 5, is characterized in that: an outer heat-insulation tile layer (10) is fixed on the inner wall of the foam layer (5) in the circumferential direction, and an outer aluminum foil layer (7) is fixed on the inner wall of the outer heat-insulation tile layer (10).
7. The manufacturing process of the prefabricated steam heat-insulation pipe with the composite heat-insulation structure is characterized in that: comprises the following steps of (a) carrying out,
s1, positioning the die tube, and facilitating demoulding treatment of the die tube;
s2, wrapping an outer aluminum foil layer (7) on the periphery of the die pipe, coaxially sleeving the outer aluminum foil layer (7) and the die pipe with a shell (2), performing foaming operation between the shell (2) and the outer aluminum foil layer (7), and forming a foam layer (5) after the foaming operation is completed;
s3, demolding, and taking down the shell (2), the foam layer (5) and the outer aluminum foil layer (7) from the mold pipe;
s4, positioning the tire tube (1), and wrapping a plurality of heat preservation tiles around the tire tube (1) in a bundling manner to form an inner heat preservation tile layer (3);
s5, tightly binding a plurality of heat preservation cotton felts on the periphery of the inner heat preservation tile layer (3) by using a binding belt to form a heat preservation cotton layer (4);
s6, wrapping the inner aluminum foil layer (6) with the convex bubbles (9) on the peripheral side of the heat-preservation cotton layer (4) in a virtual mode;
s7, inserting the inner aluminum foil layer (6), the heat-preservation cotton layer (4), the inner heat-preservation tile layer (3) and the tire tube (1) into the outer aluminum foil layer (7) together, and drawing out a binding belt for tightly binding a plurality of heat-preservation cotton felts in an interference manner;
and S8, mounting the end sealing part (11).
8. The manufacturing process of the prefabricated steam heat-preservation pipe with the composite heat-preservation structure as claimed in claim 7, is characterized in that: in the step S2, after the outer aluminum foil layer (7) is wrapped around the die tube, a plurality of heat-insulating tiles are bound around the outer aluminum foil layer (7) to form an outer heat-insulating tile layer (10), then the outer heat-insulating tile layer (10) and the die tube are coaxially sleeved with the shell (2), foaming operation is performed between the shell (2) and the outer heat-insulating tile layer (10), and after the foaming operation is completed, a foam layer (5) is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010870590.9A CN111998176A (en) | 2020-08-26 | 2020-08-26 | Prefabricated steam heat-insulating pipe with composite heat-insulating structure and manufacturing process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010870590.9A CN111998176A (en) | 2020-08-26 | 2020-08-26 | Prefabricated steam heat-insulating pipe with composite heat-insulating structure and manufacturing process thereof |
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| CN111998176A true CN111998176A (en) | 2020-11-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202791155U (en) * | 2012-09-12 | 2013-03-13 | 上海科华热力管道有限公司 | Prefabricated overhead insulating pipe |
| CN203948873U (en) * | 2014-07-08 | 2014-11-19 | 上海科华热力管道有限公司 | A kind of interior slip steamy thermal insulated direct-buried pipe |
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Application publication date: 20201127 |