CN111734894A - Composite air pipe for hydropower station and processing technology thereof - Google Patents
Composite air pipe for hydropower station and processing technology thereof Download PDFInfo
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- CN111734894A CN111734894A CN202010429572.7A CN202010429572A CN111734894A CN 111734894 A CN111734894 A CN 111734894A CN 202010429572 A CN202010429572 A CN 202010429572A CN 111734894 A CN111734894 A CN 111734894A
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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
- F16L9/00—Rigid pipes
- F16L9/22—Pipes composed of a plurality of segments
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
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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
- F16L23/00—Flanged joints
- F16L23/02—Flanged joints the flanges being connected by members tensioned axially
- F16L23/032—Flanged joints the flanges being connected by members tensioned axially characterised by the shape or composition of the flanges
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention discloses a composite air duct for a hydropower station and a processing technology thereof.A color-coated steel plate is used as an inner layer plate and an outer layer plate, the edge of the inner layer plate is processed into a combined seaming structure, the edge of the outer layer plate is processed into a snap-fastener type seaming structure, the inner layer plate and the outer layer plate are assembled into a square-back frame, an interlayer is filled in the square-back frame, flange frames penetrate through two ends of the air duct, and the flange frames are spliced and installed between the air ducts by using inserting strips. The device used in the processing technology adopted by the invention has strong mobility, can realize mechanized and large-batch production, reduces the transportation cost of products, ensures the product quality, and produces the composite air duct with corrosion resistance, pressure resistance, fire resistance and high structural strength.
Description
Technical Field
The invention relates to a composite air pipe of a hydropower station and a processing technology thereof.
Background
At present, composite material air ducts or steel air ducts made of various materials are widely applied to heating ventilation air conditioning ventilation duct systems in various fields, the fireproof grade of the heat insulating material for the air conditioner is required to reach above the incombustible A2 grade according to the latest national acceptance relevant standards of air conditioning and ventilation engineering, but the three gorges engineering design requirements of hydropower stations are based on higher requirements on the material quality and thickness of the inner wall and the outer wall of the air duct and the fireproof property, appearance quality, corrosion resistance, service life and the like of the interlayer heat insulating material of the air duct, most of the traditional composite air ducts are made of color steel plates or galvanized steel plates with common corrosion resistance, and when special working condition environments such as hydropower stations are met, the finished product air duct supply requirements of special customized materials and peripheral air ducts are required to be adopted in an automatic and customized processing and manufacturing mode, the current common processing technique, processing equipment and the mode of processing the finished product air pipe in the supplier factory and transporting the finished product air pipe to the site are not favorable for meeting the budget cost requirement and the perfect delivery requirement of the finished product air pipe.
Disclosure of Invention
The invention relates to a composite air duct for a hydropower station and a process thereof, which are used for solving the problems.
In order to realize the purpose, the method adopted by the invention is as follows: a composite air pipe for a hydropower station comprises a composite plate, a support plate and support rods, wherein the composite plate forms the air pipe, the support plate is arranged on the inner walls of two sides of the air pipe, the two support plates are connected through the support rods, the support rods are stainless steel pipes, stainless steel screw rods are arranged in the support rods, the composite plate comprises outer plates and inner plates, the edges of the outer plates are in a snap-on type seaming structure, a plurality of outer plates form an outer rectangular frame, the inner plates are in a combined seaming structure, a plurality of inner plates form an inner rectangular frame, the inner rectangular frame is arranged in the outer rectangular frame and is a rectangular frame, and an interlayer is filled between the inner rectangular frame and the outer rectangular frame; the flange frame comprises a groove body section, a first edge strip and a second edge strip are arranged on two sides of the groove body section respectively, the height of the first edge strip is larger than that of the second edge strip, and an L-shaped raised strip is arranged below the first edge strip; the two ends of the flange frame are obliquely cut by 45 degrees, the composite plate is clamped between the first edge strip and the second edge strip, the outer layer plate and the first edge strip are fixed by rivets, the bottom of the joint of the adjacent flange frames is connected by a reinforcing angle, and the outer side of the flange frame is fixed by an aluminum alloy wrap angle; a plurality of tuber pipes end to end links up, and the linking department is equipped with the cutting, and the cutting wraps up the sand grip on the flange frame that adjacent tuber pipe was established simultaneously.
The outer layer plate and the inner layer plate are double-sided hot-dip galvanized color-coated steel plates, the zinc content of the double-sided hot-dip galvanized color-coated steel plates is 175 g/square meter, polyester coatings are attached to the surfaces of the double-sided hot-dip galvanized color-coated steel plates, and the thickness of each color-coated steel plate is 1.0-1.5 mm.
The interlayer is made of high-density glass fiber plate and is denseThe degree of the reaction is 60 to 80kg/cm3The thermal conductivity coefficient is 0.035-0.038W/(m.K), and the thickness is 25-50 mm.
The outer rectangular frame is formed by buckling two ends of one outer layer plate through snap-fit type meshing, or formed by splicing two L-shaped outer layer plates through snap-fit type meshing, or formed by splicing four outer layer plates through snap-fit type meshing, or formed by splicing one flat outer layer plate and one U-shaped outer layer plate through snap-fit type meshing.
The inner rectangular frame is formed by bending two ends of one inner-layer plate through joint seaming, or formed by splicing two L-shaped inner-layer plates through joint seaming, or formed by splicing four inner-layer plates through joint seaming, or formed by splicing one flat inner-layer plate and a U-shaped inner-layer plate through joint seaming, and a wrap angle is arranged at the joint seaming.
The flange frame is the composite flange frame, the cell body section bar comprises carbon fiber cell body section bar and aluminum alloy cell body section bar, and carbon fiber cell body section bar both sides are pegged graft each other through card strip and second strake and aluminum alloy cell body section bar, aluminum alloy cell body section bar and first strake and sand grip integrated into one piece.
The processing technology of the composite air pipe for the hydropower station comprises the following steps:
(1) adopting a double-sided hot-dip galvanized color-coated steel plate as an inner layer plate and an outer layer plate, wherein the zinc content is 175 g/square meter of polyester coating attached to the surface of the double-sided hot-dip galvanized color-coated steel plate, the thickness of the color-coated steel plate is 1.0-1.5 mm, and cutting the plate into sheets;
(2) pressing the sheet-shaped plate out of the reinforcing ribs by a rib pressing machine;
(3) utilizing a combined seam machine to process the edge of the inner layer plate to form a combined seam, assembling the combined seam into an inner rectangular frame, utilizing a snap-fastener seam machine to process the edge of the outer layer plate to form a snap-fastener seam, and assembling the snap-fastener seam into an outer rectangular frame;
(4) sleeving the outer rectangular frame on the outer side of the inner rectangular frame to form a square frame, and cutting a high-density glass fiber board according to the square frame, wherein the density of the high-density glass fiber board is 60-80 kg/cm3The heat conductivity coefficient is 0.035-0.038W/(m.K), the thickness is 25-50 mm, and the material is placed in the internal spaceAn air pipe is formed between the rectangular frame and the outer rectangular frame;
(5) cutting two ends of an aluminum alloy bridge-cut flange to form 45 degrees, splicing to manufacture a flange frame, inserting two ends of an air pipe into the flange frame, fixing by using rivets, and fixing the corners by adopting reinforcing feet and aluminum alloy wrap angles;
(6) the adjacent air pipes are spliced with the flange frames by adopting horizontally-inserted inserting strips;
(7) and loading the finished product, and placing glass fiber plates between the air pipes for separation.
The beneficial effects are as follows: the device used in the processing technology adopted by the invention has strong mobility, can realize mechanized and large-batch production, reduces the transportation cost of products, ensures the product quality, and produces the composite air duct with corrosion resistance, pressure resistance, fire resistance and high structural strength.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of the air duct structure of the present invention;
FIG. 2 is a schematic cross-sectional view of the air duct;
FIG. 3 is a schematic view of the structure of the flange frame;
FIG. 4 is a schematic view of the flange frame connection structure;
FIG. 5 is a schematic view of the air duct connection;
fig. 6 is a schematic structural view of the combined flange frame.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
As shown in fig. 1, a composite air duct for a hydropower station comprises a composite plate 1, a support plate 2 and support rods 3, wherein the composite plate 1 forms the air duct, the support plate 2 is arranged on the inner walls of the two sides of the air duct, the two support plates 2 are connected through the support rods 3, the support rods 3 are stainless steel tubes, and stainless steel lead screws are arranged in the support rods 3, as shown in fig. 2, the composite plate 1 comprises an outer plate 11 and an inner plate 12, the edge of the outer plate 11 is of a snap-on type seaming structure, the outer rectangular frame is formed by a plurality of outer plates 11, the inner plate 12 is of a combined seaming structure, the inner rectangular frame is formed by a plurality of inner plates 12, the inner rectangular frame is arranged in the outer rectangular frame and is of a rectangular frame shape, and an interlayer 13 is; the two ends of the air pipe are sleeved with flange frames 6 in a penetrating manner, as shown in fig. 3, each flange frame 6 comprises a groove body section bar 63, a first edge bar 61 and a second edge bar 62 are arranged on the two sides of each groove body section bar 63 respectively, the height of the first edge bar 61 is larger than that of the second edge bar 62, and an L-shaped protruding strip 64 is arranged below the first edge bar 61; the two ends of the flange frame 6 are obliquely cut by 45 degrees, the composite plate 1 is clamped between the first edge 61 and the second edge 62, the outer layer plate 11 and the first edge 61 are fixed by the rivet 5, as shown in fig. 4, the bottom of the joint of the adjacent flange frames is connected by the reinforced angle 8, and the outer side of the joint is fixed by the aluminum alloy wrap angle 7; as shown in fig. 5, the air ducts are connected end to end, the joints are provided with the cutting strips 4, and the cutting strips 4 simultaneously wrap the convex strips on the flange frames of the adjacent air ducts.
The outer layer plate 11 and the inner layer plate 12 are double-sided hot-dip galvanized color-coated steel plates, the zinc content of the double-sided hot-dip galvanized color-coated steel plates is 175 g/square meter, polyester coatings are attached to the surfaces of the double-sided hot-dip galvanized color-coated steel plates, and the thickness of the color-coated steel plates is 1.0-1.5 mm.
The interlayer 13 is a high-density glass fiber plate with the density of 60-80 kg/cm3The thermal conductivity coefficient is 0.035-0.038W/(m.K), and the thickness is 25-50 mm.
The inner rectangular frame is formed by bending two ends of one inner-layer plate and meshing the two ends through a joint seam, or formed by splicing two L-shaped inner-layer plates through a joint seam, or formed by splicing four inner-layer plates through a joint seam, or formed by splicing one flat inner-layer plate and a U-shaped inner-layer plate through a joint seam.
The outer rectangular frame is formed by buckling two ends of one outer layer plate through snap-fit type meshing, or formed by splicing two L-shaped outer layer plates through snap-fit type meshing, or formed by splicing four outer layer plates through snap-fit type meshing, or formed by splicing one flat outer layer plate and one U-shaped outer layer plate through snap-fit type meshing.
The inner rectangular frame is formed by bending two ends of one inner-layer plate through joint seaming, or formed by splicing two L-shaped inner-layer plates through joint seaming, or formed by splicing four inner-layer plates through joint seaming, or formed by splicing one flat inner-layer plate and a U-shaped inner-layer plate through joint seaming, and a wrap angle is arranged at the joint seaming.
As shown in fig. 6, the flange frame 6 is a combined flange frame, the tank body section 63 is composed of a carbon fiber tank body section 631 and an aluminum alloy tank body section 632, two sides of the carbon fiber tank body section 631 are inserted into the second edge 62 and the aluminum alloy tank body section 632 through the clamping strip 65, and the aluminum alloy tank body section 632, the first edge 61 and the protruding strip 64 are integrally formed.
The processing technology of the composite air pipe for the hydropower station comprises the following steps:
(1) adopting a double-sided hot-dip galvanized color-coated steel plate as an inner layer plate and an outer layer plate, wherein the zinc content is 175 g/square meter of polyester coating attached to the surface of the double-sided hot-dip galvanized color-coated steel plate, the thickness of the color-coated steel plate is 1.0-1.5 mm, and cutting the plate into sheets;
(2) pressing the sheet-shaped plate out of the reinforcing ribs by a rib pressing machine;
(3) utilizing a combined seam machine to process the edge of the inner layer plate to form a combined seam, assembling the combined seam into an inner rectangular frame, utilizing a snap-fastener seam machine to process the edge of the outer layer plate to form a snap-fastener seam, and assembling the snap-fastener seam into an outer rectangular frame;
(4) sleeving the outer rectangular frame outside the inner rectangular frame to form a square frame, and cutting a high-density glass fiber board according to the square frame, wherein the density of the high-density glass fiber board is 60-80 kg/cm3The heat conductivity coefficient is 0.035-0.038W/(m.K), the thickness is 25-50 mm, and the heat conduction coefficient and the thickness are placed between the inner rectangular frame and the outer rectangular frame to form an air pipe;
(5) cutting two ends of an aluminum alloy bridge-cut flange to form 45 degrees, splicing to manufacture a flange frame, inserting two ends of an air pipe into the flange frame, fixing by using rivets, and fixing the corners by adopting reinforcing feet and aluminum alloy wrap angles;
(6) the adjacent air pipes are spliced with the flange frames by adopting horizontally-inserted inserting strips;
(7) and loading the finished product, and placing glass fiber plates between the air pipes for separation.
The device used by the processing technology adopted by the invention has strong mobility, the design concept of the container type production line not only solves the problem of factory mobility with mechanical and large-batch production capacity, but also ensures the quality control of the air pipe processing link, and simultaneously realizes the purpose that the ultra-large air pipe can reach the construction site only through short-distance transportation, thereby reducing the collision and damage risks in the transportation process as much as possible, and simultaneously greatly reducing the transportation cost of the finished air pipe. The color-coated steel plate sandwiched high-density glass fiber plate structure with the inner layer and the outer layer is adopted, the produced composite air pipe is corrosion-resistant, pressure-resistant, fire-resistant and high in structural strength, the aluminum alloy bridge-cutoff flange and the inserting strip type structure are spliced, the structure is stable, the installation is convenient and rapid, the space occupied by the original angle steel flange or the common plate flange is reduced, the occupied space of the air pipe appearance in the height direction and the width direction of a factory building is saved, and the construction cost of the building is reduced to a certain extent.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (7)
1. A composite air pipe for a hydropower station comprises a composite plate (1), supporting discs (2) and supporting rods (3), and is characterized in that the composite plate (1) forms the air pipe, the supporting discs (2) are arranged on the inner walls of the two sides of the air pipe, the two supporting discs (2) are connected through the supporting rods (3), the supporting rods (3) are stainless steel pipes, stainless steel lead screws are arranged in the supporting rods (3), the composite plate (1) comprises outer plates (11) and inner plates (12), the edges of the outer plates (11) are in a snap-fit type engagement structure, the outer plates (11) form an outer rectangular frame, the inner plates (12) are in a combined engagement structure, the inner rectangular frame is arranged in the outer rectangular frame and is in a shape like a Chinese character 'hui', and an interlayer (13) is filled between the inner rectangular frame and the outer rectangular frame; the flange frame (6) is sleeved at two ends of the air pipe in a penetrating manner, the flange frame (6) comprises a groove body section bar (63), a first edge bar (61) and a second edge bar (62) are arranged on two sides of the groove body section bar (63) respectively, the height of the first edge bar (61) is larger than that of the second edge bar (62), and an L-shaped raised line (64) is arranged below the first edge bar (61); the two ends of the flange frame (6) are obliquely cut by 45 degrees, the composite plate (1) is clamped between the first edge strip (61) and the second edge strip (62), the outer layer plate (11) and the first edge strip (61) are fixed by a rivet (5), the bottom of the joint of the adjacent flange frames is connected by a reinforcing angle (8), and the outer side of the joint is fixed by an aluminum alloy wrap angle (7); a plurality of tuber pipes end to end links up, and linking department is equipped with cutting (4), and cutting (4) wrap up the sand grip on the flange frame that adjacent tuber pipe was established simultaneously.
2. The composite air duct for the hydropower station according to claim 1, wherein the outer plate (11) and the inner plate (12) are double-sided hot-dip galvanized color-coated steel plates, the zinc content of the double-sided hot-dip galvanized color-coated steel plates is 175 g/square meter, and polyester coatings are adhered to the surfaces of the double-sided hot-dip galvanized color-coated steel plates, and the thickness of the color-coated steel plates is 1.0-1.5 mm.
3. The composite air duct for the hydropower station according to claim 1, wherein the interlayer (13) is a high-density glass fiber plate with a density of 60-80 kg/cm3The thermal conductivity coefficient is 0.035-0.038W/(m.K), and the thickness is 25-50 mm.
4. The composite wind pipe for hydropower station according to claim 1, wherein the outer rectangular frame is formed by buckling two ends of one outer plate and snap-fastening-type seaming, or formed by splicing two L-shaped outer plates through snap-fastening-type seaming, or formed by splicing four outer plates through snap-fastening-type seaming, or formed by splicing one flat outer plate and one U-shaped outer plate through snap-fastening-type seaming.
5. The composite wind pipe for hydropower station according to claim 1, wherein the inner rectangular frame is formed by folding two ends of one inner layer board and engaging the two ends through a joint seam, or is formed by splicing two L-shaped inner layer boards through a joint seam, or is formed by splicing four inner layer boards through a joint seam, or is formed by splicing one flat inner layer board and a U-shaped inner layer board through a joint seam, and the joint seam is provided with a wrap angle.
6. The composite air pipe for the hydropower station according to claim 1, wherein the flange frame (6) is a combined flange frame, the tank body section (63) is composed of a carbon fiber tank body section (631) and an aluminum alloy tank body section (632), two sides of the carbon fiber tank body section (631) are mutually inserted with the second edge strip (62) and the aluminum alloy tank body section (632) through clamping strips (65), and the aluminum alloy tank body section (632) is integrally formed with the first edge strip (61) and the convex strip (64).
7. The processing technology of the composite air pipe for the hydropower station is characterized by comprising the following steps of:
(1) adopting a double-sided hot-dip galvanized color-coated steel plate as an inner layer plate and an outer layer plate, wherein the zinc content is 175 g/square meter of polyester coating attached to the surface of the double-sided hot-dip galvanized color-coated steel plate, the thickness of the color-coated steel plate is 1.0-1.5 mm, and cutting the plate into sheets;
(2) pressing the sheet-shaped plate out of the reinforcing ribs by a rib pressing machine;
(3) utilizing a combined seam machine to process the edge of the inner layer plate to form a combined seam, assembling the combined seam into an inner rectangular frame, utilizing a snap-fastener seam machine to process the edge of the outer layer plate to form a snap-fastener seam, and assembling the snap-fastener seam into an outer rectangular frame;
(4) sleeving the outer rectangular frame on the outer side of the inner rectangular frame to form a square frame, and cutting a high-density glass fiber board according to the square frame, wherein the density of the high-density glass fiber board is 60-80 kg/cm3The heat conductivity coefficient is 0.035-0.038W/(m.K), the thickness is 25-50 mm, and the heat conduction coefficient and the thickness are placed between the inner rectangular frame and the outer rectangular frame to form an air pipe;
(5) cutting two ends of an aluminum alloy bridge-cut flange to form 45 degrees, splicing to manufacture a flange frame, inserting two ends of an air pipe into the flange frame, fixing by using rivets, and fixing the corners by adopting reinforcing feet and aluminum alloy wrap angles;
(6) the adjacent air pipes are spliced with the flange frames by adopting horizontally-inserted inserting strips;
(7) and loading the finished product, and placing glass fiber plates between the air pipes for separation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010429572.7A CN111734894A (en) | 2020-05-20 | 2020-05-20 | Composite air pipe for hydropower station and processing technology thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010429572.7A CN111734894A (en) | 2020-05-20 | 2020-05-20 | Composite air pipe for hydropower station and processing technology thereof |
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| Publication Number | Publication Date |
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| CN111734894A true CN111734894A (en) | 2020-10-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010429572.7A Pending CN111734894A (en) | 2020-05-20 | 2020-05-20 | Composite air pipe for hydropower station and processing technology thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114151653A (en) * | 2021-12-09 | 2022-03-08 | 上海大音希声新型材料有限公司 | Heat-insulating aerogel sleeve block group for square-shaped pipeline |
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| CN108916489A (en) * | 2018-08-03 | 2018-11-30 | 江阴蔚蓝环境机械科技有限公司 | Combine press-button type clad steel face strength energy-saving composite air duct and preparation method thereof |
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| CN201043651Y (en) * | 2007-06-18 | 2008-04-02 | 浙江长城净化工程技术有限公司 | Broken bridge connecting flange of composite air duct |
| CN101963261A (en) * | 2010-08-30 | 2011-02-02 | 陕西建工集团第一建筑工程有限公司 | Energy-saving glass fiber and magnesium composite air duct manufacture and installation method |
| CN202868100U (en) * | 2012-11-22 | 2013-04-10 | 河北空调工程安装有限公司 | Sealed environment-friendly two-sided color steel plate compound air duct |
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| CN203784484U (en) * | 2014-04-24 | 2014-08-20 | 梁宜松 | Reinforced double-sidedcolor steel plate composite air duct |
| CN204421300U (en) * | 2014-12-22 | 2015-06-24 | 江阴蔚蓝环境机械科技有限公司 | A kind of associating flange composite air duct |
| CN205745688U (en) * | 2016-05-12 | 2016-11-30 | 陕西建工安装集团有限公司 | A kind of closure seam is the rectangular metal airduct of single flat mouth seaming |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114151653A (en) * | 2021-12-09 | 2022-03-08 | 上海大音希声新型材料有限公司 | Heat-insulating aerogel sleeve block group for square-shaped pipeline |
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Application publication date: 20201002 |