CN116697154A - Bending double-layer pipe with good heat insulation and manufacturing method thereof - Google Patents
Bending double-layer pipe with good heat insulation and manufacturing method thereof Download PDFInfo
- Publication number
- CN116697154A CN116697154A CN202310856358.3A CN202310856358A CN116697154A CN 116697154 A CN116697154 A CN 116697154A CN 202310856358 A CN202310856358 A CN 202310856358A CN 116697154 A CN116697154 A CN 116697154A
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- China
- Prior art keywords
- pipe body
- inner pipe
- outer pipe
- double
- interlayer cavity
- Prior art date
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- Pending
Links
- 238000005452 bending Methods 0.000 title claims abstract description 59
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000009413 insulation Methods 0.000 title abstract description 10
- 239000010410 layer Substances 0.000 claims abstract description 63
- 239000011229 interlayer Substances 0.000 claims abstract description 35
- 239000007788 liquid Substances 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000002184 metal Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000010720 hydraulic oil Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 abstract description 7
- 239000000843 powder Substances 0.000 description 7
- 239000012530 fluid Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000006261 foam material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920006327 polystyrene foam Polymers 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/12—Bending rods, profiles, or tubes with programme control
-
- 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
- F16L59/06—Arrangements using an air layer or vacuum
- F16L59/065—Arrangements using an air layer or vacuum using vacuum
Abstract
The invention discloses a bending double-layer pipe with good heat insulation and a manufacturing method thereof. In the process of manufacturing the double-layer pipe, the interlayer cavity formed by the gap between the outer pipe body and the inner pipe body is filled with liquid in a pressurizing way in advance, and the liquid is sealed in the interlayer cavity; in the bending process of the bending machine, as the sealing liquid is uniformly transferred to external force and converted into pressure, the outer pipe body and the inner pipe are subjected to the bending deformation to the same extent, the pipe axis of the outer pipe body is kept consistent with the pipe axis of the inner pipe body, the inner pipe body is uniformly centered in the outer pipe body pipeline, and the inner pipe body at the original bending position is prevented from being close to the inner wall of the outer pipe body.
Description
Technical Field
The invention relates to the technical field of bent double-layer pipes, in particular to a double-layer pipe bending manufacturing method with good heat insulation.
Background
The vacuum double-layer pipe is a pipe body with an inner pipe and an outer pipe, wherein the pipe body is provided with two layers of structures, and air in a gap between the inner pipe and the outer pipe is pumped out to form vacuum, so that a pipeline for conveying medium temperature can be kept. The vacuum double-layer pipe has good heat insulation effect, is particularly suitable for a pipeline for conveying cold medium in an automobile refrigerating system and is used for connection among an air compressor, an evaporator and a condenser, but the vacuum double-layer pipe used on an automobile needs to be bent into various shapes, such as U-shaped, V-shaped, circular arc-shaped and the like, so that the vacuum double-layer pipe is suitable for narrow automobile cabin pipeline layout, but the bent vacuum double-layer pipe is not mature in manufacturing technology, so that an inner pipe of the vacuum double-layer pipe at a bent part is close to or is adhered to the inner wall of an outer pipe, and the inner pipe is in contact with the outer pipe to easily generate heat transfer, so that the heat insulation performance of the vacuum double-layer pipe is poor.
The method for manufacturing the bent vacuum double-layer tube in the prior art comprises the following steps of: firstly, preparing two straight pipe bodies with a large pipe diameter and a small pipe diameter, and sleeving the pipe body with a large pipe diameter into the pipe body with a small pipe diameter to form a double-layer pipe; sealing the inner tube and the outer tube at one end of the double-layer tube by using a sealing cover, filling powder into the inner tube of the double-layer tube and gaps between the inner tube and the outer tube, and sealing the other end of the double-layer tube; and finally, installing the filled double-layer pipe on a pipe bending machine, bending the double-layer pipe according to parameters set by a program on the pipe bending machine, wherein in the bending process, a mold and a clamping seat are matched with the outer pipe to apply bending force to the outer pipe, the bending force is transmitted to the inner pipe through powder, but the powder stress surface is different and cannot be uniformly transmitted to the inner pipe, so that the deformation of the bending part of the inner pipe is uneven, the pipe core of the inner pipe is flattened or the pipe wall is uneven and not smooth, the pipe core is not overlapped with the pipe axis of the outer pipe, and the consistency of a gap between the inner pipe and the outer layer is poor. Meanwhile, the double-layer pipe formed by bending is detached from the pipe bending machine, the sealing covers at the two ends of the double-layer pipe are required to be opened, powder in the original filled inner double-layer pipe is discharged in a vibration mode, and after the powder is cleaned, the double-layer pipe is cleaned by water or cleaning liquid, so that the double-layer pipe is various in manufacturing process and low in production efficiency.
Disclosure of Invention
The invention aims to provide a curved double-layer pipe with good heat insulation and a manufacturing method thereof, which are used for solving the problems in the background art, and the hollow cavity of a gap between an inner pipe body and an outer pipe body of the double-layer pipe is good in consistency, and the pipe axis of the inner pipe body is highly coincident with the pipe axis of the outer pipe body; in addition, the double-layer pipe seals liquid in the interlayer cavity in the bending manufacturing process, so that deformation forces born by the inner pipe body and the outer pipe body are equal, the bending parts of the inner pipe body and the outer pipe body deform in the same process, and the pipe axis of the inner pipe body and the pipe axis of the outer pipe body are always kept coincident.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the utility model provides a well crooked double-layer pipe insulates against heat, it includes that the pipe diameter is great length shorter outer body, the pipe diameter is less the longer inner tube body of length and is the end cap of ring shape, and outer body cup joints on the inner tube body, and clearance between outer tube body and the inner tube body constitutes annular intermediate layer chamber, and two end caps are plugged into respectively the sealed intermediate layer chamber in intermediate layer chamber's both ends, and the end cap welds together with the port portion of outer tube body, inner tube body outer wall respectively, the air in the intermediate layer chamber is taken out the drainage and is formed the vacuum.
The bending manufacturing method of the double-layer pipe with the bending shape comprises the following specific steps:
the first step: calculating the lengths of the outer pipe body and the inner pipe body which are required to be in a linear shape according to the specification of a finished product required by a customer, and cutting the two material pipes which are in a linear shape and have a large pipe diameter into a raw outer pipe body and an inner pipe body according to specific lengths;
and a second step of: sleeving an original outer pipe body with a larger pipe diameter and a shorter length on an original inner pipe body with a smaller pipe diameter and a longer length, wherein a gap is formed between the outer pipe body and the inner pipe body, an interlayer cavity is formed between the outer pipe body and the inner pipe body, the inner pipe body is arranged in the outer pipe body in a centering manner, and the pipe axes of the inner pipe body and the outer pipe body are overlapped together; then, a ring-shaped plug is sleeved from one end of the inner pipe body and is plugged into one port of the outer pipe body, the plug is fixedly connected with the port part of the outer pipe body and the outer wall of the inner pipe body in a welding mode respectively, and one port of the interlayer cavity is completely sealed;
and a third step of: injecting liquid such as water or hydraulic oil into the interlayer cavity from the other end opening of the outer pipe body, filling the cavity of the gap between the outer pipe body and the inner pipe body with the liquid, sleeving and plugging the other plug into the other end opening of the outer pipe body from the other end opening of the inner pipe body, and fixedly connecting the plug with the other end opening of the outer pipe body and the outer wall of the other side of the inner pipe body in a welding manner to completely seal the other end opening of the interlayer cavity;
fourth step: placing the two double-layer pipes in a straight shape which are sleeved together on a numerical control bending machine, and bending the original double-layer pipe in a straight shape into a customized shape by the bending machine under the cooperation of a metal die and a bending machine seat;
fifth step: the manufactured double-layer pipe with the bent shape is detached from the numerical control bending machine, one of the plugs is provided with a through hole, and the liquid originally poured into the gap between the outer pipe body and the inner pipe body is completely discharged.
Sixth step: an air tap is arranged on the through hole of the plug, the air tap is connected with the vacuum extractor, the vacuum extractor pumps out the air in the gap between the outer pipe body and the inner pipe body, so that the interlayer cavity forms vacuum, the bent double-layer pipe has a vacuum effect, and the heat exchange between the inner pipe fluid of the double-layer pipe and the outside is effectively blocked.
Further, in order to better realize the same degree of deformation of the inner and outer pipe bodies in the bending process, the deformation shrinkage of the interlayer cavity caused by the compression of the liquid volume when the outer pipe body is acted on the liquid by external force is reduced, the interlayer cavity between the outer pipe body and the inner pipe body is filled with the liquid in a pressurizing mode, and the pressure value of the liquid is greater than 80% of the limit value of the bearable deformation pressure of the outer pipe body or the inner pipe body.
Preferably, the liquid pressure value is greater than 95% of the limit value of the sustainable deformation pressure of the outer or inner pipe body.
Further, in order to enhance the same degree of bending deformation and uniform extensibility of the inner and outer tubular bodies, both the inner and outer tubular bodies are metal tubes.
Preferably, the tube thickness of the raw material tubes of the inner tube body and the outer tube body is the same.
According to the double-layer pipe bending manufacturing method provided by the invention, as the double-layer pipe is arranged in front of the bending machine, the liquid is filled in the interlayer cavity formed by the gap between the outer pipe body and the inner pipe body in a pressurized manner in advance, and the liquid is sealed in the interlayer cavity. When the bending machine is used for bending, the outer pipe body is contacted with the die and the clamping seat, external force is applied to the part of the double-layer pipe which needs to be bent, and the external force acting on the outer pipe body is uniformly transferred to the inner pipe body through liquid and converted into pressure. In the bending process, the outer pipe body and the inner pipe are subjected to the same-degree bending deformation under the action of the external force of the sealing liquid which is uniformly transmitted and converted into pressure, the pipe axis of the outer pipe body is consistent with the pipe axis of the inner pipe body, the inner pipe body is uniformly centered in the outer pipe body pipeline, and the inner pipe body at the original bending position is prevented from being close to the inner wall of the outer pipe body, so that the heat insulation performance of the double-layer pipe is influenced.
Drawings
Fig. 1 is a front view of the present invention.
Fig. 2 is a cross-sectional view of the present invention.
FIG. 3 is a schematic diagram of the fabrication steps of the present invention.
Marked in the figure are: 1. the outer pipe body 2, the inner pipe body 3, the end cap 4, intermediate layer chamber 4.
Detailed Description
In order to make the purposes, technical solutions and technical effects of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The described implementations are only some, but not all, examples of the invention. In the present invention, terms such as "connected," "disposed," "mounted," and the like are to be construed broadly. For example, "connected" may be a fixed connection, an articulating connection, or a removable connection; but also mechanical or electrical connections; or directly connected, or indirectly connected through an intermediate medium, or communicated between two elements or the interaction relationship between the two elements; unless specifically defined and limited otherwise, it will be understood by those of ordinary skill in the art that the specific meaning of the terms described above in this application will be understood as appropriate.
As shown in figures 1 and 2, the bending double-layer pipe with good heat insulation comprises an outer pipe body 1 with a larger pipe diameter and a shorter pipe diameter, an inner pipe body 2 with a longer pipe diameter and a longer pipe length, and plugs 3 which are in a circular ring shape, wherein the outer pipe body 1 is sleeved on the inner pipe body 2, a gap between the outer pipe body 1 and the inner pipe body 2 forms an annular interlayer cavity 4, two plugs are respectively plugged into two ends of the interlayer cavity to seal the interlayer cavity 4, the plugs are respectively welded and fixed with an end opening part of the outer pipe body and the outer wall of the inner pipe body, and air in the interlayer cavity 4 is pumped and discharged to form vacuum.
The bending manufacturing method of the bending double-layer pipe comprises the following steps:
the first step: calculating the lengths of an outer pipe body and an inner pipe body which are required to be in a linear shape according to the specification requirements of finished products of customers, and cutting two raw pipe bodies with the pipe diameters of one large and one small and in a linear shape into an original outer pipe body 1 and an original inner pipe body 2 according to specific lengths;
and a second step of: the original outer pipe body 1 with larger pipe diameter and shorter length is sleeved on the original inner pipe body 2 with smaller pipe diameter and longer length, a gap is formed between the outer pipe body 1 and the inner pipe body 2 to form an interlayer cavity 4, the inner pipe body 2 is arranged in the outer pipe body 1 in the middle, and the pipe axes of the inner pipe body 2 and the outer pipe body 1 are overlapped together; then, a circular plug 3 is sleeved from one end of the inner pipe body 1 and is plugged into one port of the outer pipe body 2, the plug 3 is fixedly connected with the port part of the outer pipe body 1 and the outer wall of the inner pipe body 2 in a welding mode respectively, and one port of the interlayer cavity 4 is completely sealed;
and a third step of: injecting liquid 5 such as water or hydraulic oil into the interlayer cavity from the opening at the other end of the outer pipe body 1, filling the cavity of the gap between the outer pipe body and the inner pipe body with the liquid, sleeving and plugging the other plug 3 into the other port of the outer pipe body from the other end of the inner pipe body 2, and fixedly connecting the plug 3 with the other end opening of the outer pipe body 1 and the outer wall at the other side of the inner pipe body 2 in a welding manner respectively to completely seal the other port of the interlayer cavity 4;
fourth step: placing the two double-layer pipes in a straight shape which are sleeved together on a numerical control bending machine, and bending the original double-layer pipe in a straight shape into a customized shape by the bending machine under the cooperation of a metal die and a bending machine seat;
fifth step: the manufactured double-layer pipe with the bent shape is detached from the numerical control bending machine, one through hole is drilled on one of the plugs 3, and the liquid 5 originally poured into the gap between the outer pipe body 1 and the inner pipe body 2 is completely discharged.
Sixth step: an air tap is arranged on the through hole of the plug 3, the air tap is connected by a vacuum extractor, the vacuum extractor pumps out air in a gap between the outer pipe body and the inner pipe body, so that the interlayer cavity forms vacuum, and the bent double-layer pipe has a vacuum effect, thereby effectively blocking heat exchange between the inner pipe fluid of the double-layer pipe and the outside.
Further, in order to better realize the same degree of deformation of the inner and outer pipe bodies in the bending process, the deformation shrinkage of the interlayer cavity caused by the compression of the liquid volume when the outer pipe body is acted on the liquid by external force is reduced, the interlayer cavity 4 between the outer pipe body 1 and the inner pipe body 2 is filled with the liquid in a pressurizing mode, and the pressure value of the liquid is greater than 80% of the limit value of the bearable deformation pressure of the outer pipe body or the inner pipe body.
Preferably, the liquid pressure value is greater than 95% of the limit value of the sustainable deformation pressure of the outer or inner pipe body.
Furthermore, in order to enhance the same degree of bending deformation and consistent extensibility of the inner and outer tube bodies, the raw material tubes of the inner and outer tube bodies are metal tubes made of copper-containing materials.
Preferably, the tube thickness of the raw material tubes of the inner tube body and the outer tube body is the same.
Further, the sixth step may be: the gap between the outer tube body 1 and the inner tube body 2 is filled with powder of an insulating material or foam materials such as polyurethane foam, polystyrene foam and the like are injected, and the powder or the foam materials have good insulating purposes, so that heat exchange between the inner tube fluid of the double-layer tube and the outside is effectively blocked.
The principle of the invention is as follows: before the double-layer tube is arranged on the bending machine, the interlayer cavity 4 formed by the gap between the outer tube body 1 and the inner tube body 2 is filled with liquid such as water or hydraulic oil in advance, and the liquid is sealed in the interlayer cavity 4. When the bending machine is used for bending, the outer pipe body 1 is contacted with the die and the clamping seat, external force is applied to the part of the double-layer pipe which needs to be bent, and the external force applied to the outer pipe body is uniformly transferred to the inner pipe body 1 through liquid and converted into pressure. In the bending process, as the sealing liquid uniformly transmits external force and is converted into pressure, the outer pipe body and the inner pipe are subjected to bending deformation to the same extent, the pipe axis of the outer pipe body is kept consistent with the pipe axis of the inner pipe body, concentric circles of the outer pipe body and the inner pipe body are distributed when the cross section of the double-layer pipe formed by bending is observed, the inner pipe body is uniformly centered in the outer pipe body pipeline, and the inner pipe body at the original bending position is prevented from being close to the inner wall of the outer pipe body so as to influence the heat insulation performance of the double-layer pipe.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (6)
1. A well insulated curved double-layer tube is characterized in that: the double-layer pipe comprises an outer pipe body with a larger pipe diameter and a shorter length, an inner pipe body with a smaller pipe diameter and a longer length and plugs in a circular ring shape, wherein the outer pipe body is sleeved on the inner pipe body, a gap between the outer pipe body and the inner pipe body forms an annular interlayer cavity, the two plugs are respectively plugged into the two ends of the interlayer cavity to seal the interlayer cavity, the plugs are respectively welded with the port part of the outer pipe body and the outer wall of the inner pipe body, and air in the interlayer cavity is pumped to form vacuum.
2. A double tube as claimed in claim 1 wherein: the outer pipe body and the inner pipe body are both metal pipes.
3. The double-layered tube of claim 2, wherein: the thickness of the raw material pipes of the inner pipe body and the outer pipe body is the same.
4. A method of making a double tube as claimed in claims 1 to 3, wherein: the method comprises the following steps:
the first step: calculating the lengths of the outer pipe body and the inner pipe body which are required to be in a linear shape according to the specification of a finished product required by a customer, and cutting the two material pipes which are in a linear shape and have a large pipe diameter into a raw outer pipe body and an inner pipe body according to specific lengths;
and a second step of: sleeving an original outer pipe body with a larger pipe diameter and a shorter length on an original inner pipe body with a smaller pipe diameter and a longer length, wherein a gap is formed between the outer pipe body and the inner pipe body, an interlayer cavity is formed between the outer pipe body and the inner pipe body, the inner pipe body is arranged in the outer pipe body in a centering manner, and the pipe axes of the inner pipe body and the outer pipe body are overlapped together; then, a ring-shaped plug is sleeved from one end of the inner pipe body and is plugged into one port of the outer pipe body, the plug is fixedly connected with the port part of the outer pipe body and the outer wall of the inner pipe body in a welding mode respectively, and one port of the interlayer cavity is completely sealed;
and a third step of: injecting liquid such as water or hydraulic oil into the interlayer cavity from the other end opening of the outer pipe body, filling the cavity of the gap between the outer pipe body and the inner pipe body with the liquid, sleeving and plugging the other plug into the other end opening of the outer pipe body from the other end opening of the inner pipe body, and fixedly connecting the plug with the other end opening of the outer pipe body and the outer wall of the other side of the inner pipe body in a welding manner to completely seal the other end opening of the interlayer cavity;
fourth step: placing the two double-layer pipes in a straight shape which are sleeved together on a numerical control bending machine, and bending the original double-layer pipe in a straight shape into a customized shape by the bending machine under the cooperation of a metal die and a bending machine seat;
fifth step: the manufactured double-layer pipe with the bent shape is detached from the numerical control bending machine, one of the plugs is provided with a through hole, and the liquid originally poured into the gap between the outer pipe body and the inner pipe body is completely discharged.
Sixth step: an air tap is arranged on the through hole of the plug, the air tap is connected with a vacuum extractor, and the vacuum extractor pumps out the air in the gap between the outer pipe body and the inner pipe body, so that the interlayer cavity forms vacuum, and the bent double-layer pipe has a vacuum effect.
5. A method of bending a double tube as defined in claim 4, wherein: in the third step, the interlayer cavity between the outer pipe body and the inner pipe body is filled with liquid in a pressurizing mode, and the pressure value of the liquid is greater than 80% of the limit value of the bearable deformation pressure of the outer pipe body or/and the inner pipe body.
6. A method of bending a double tube as defined in claim 5, wherein: the liquid pressure value is more than 95% of the limit value of the bearable deformation pressure of the outer pipe body or the inner pipe body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310856358.3A CN116697154A (en) | 2023-07-12 | 2023-07-12 | Bending double-layer pipe with good heat insulation and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310856358.3A CN116697154A (en) | 2023-07-12 | 2023-07-12 | Bending double-layer pipe with good heat insulation and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116697154A true CN116697154A (en) | 2023-09-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310856358.3A Pending CN116697154A (en) | 2023-07-12 | 2023-07-12 | Bending double-layer pipe with good heat insulation and manufacturing method thereof |
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| Country | Link |
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| CN (1) | CN116697154A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117020590A (en) * | 2023-10-08 | 2023-11-10 | 核工业西南物理研究院 | Manufacturing method of special pipe with interlayer |
-
2023
- 2023-07-12 CN CN202310856358.3A patent/CN116697154A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117020590A (en) * | 2023-10-08 | 2023-11-10 | 核工业西南物理研究院 | Manufacturing method of special pipe with interlayer |
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