CN213206815U - Outdoor heat-insulation water supply pipe - Google Patents
Outdoor heat-insulation water supply pipe Download PDFInfo
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- CN213206815U CN213206815U CN202022129209.1U CN202022129209U CN213206815U CN 213206815 U CN213206815 U CN 213206815U CN 202022129209 U CN202022129209 U CN 202022129209U CN 213206815 U CN213206815 U CN 213206815U
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- pipeline
- electric heating
- heating wire
- interlayer
- solar panel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The application relates to an outdoor heat-insulation water supply pipe, which belongs to the technical field of water supply pipelines and comprises a pipeline, wherein an interlayer is arranged between the inner wall and the outer wall of the pipeline, and a heating device for heating is arranged in the interlayer; a waterproof motor is arranged in the pipeline, and blades are arranged on an output shaft of the waterproof motor; a placing seat is arranged close to the pipeline, the placing seat is arranged on the ground, a solar panel is arranged on the placing seat, a driving piece for driving the solar panel to rotate is arranged on the placing seat, and the solar panel is used for supplying power to the waterproof motor; this application has the possibility that reduces the water pipe and freeze and damage.
Description
Technical Field
The application relates to the technical field of water pipelines, in particular to an outdoor heat-preservation water supply pipe.
Background
The water supply pipe is generally used for a domestic cold and hot water system and comprises a central air-conditioning system, a floor heating system and a domestic drinking water system. Can be used as a water system carrier for transporting life sources and the basis of human civilized survival and development. The water supply pipe is divided into a metal pipe, a plastic pipe and a composite pipe, wherein the metal pipe comprises a copper tube, a stainless steel pipe and a steel pipe, the plastic pipe is the PPR water pipe which is most commonly used, and the PPR water pipe is safe, non-toxic, convenient to install, low in price and the like, and becomes the most commonly used water pipe for home decoration.
For example, patent document No. CN203131324U discloses a water supply pipe, which comprises an inner layer structure and an outer layer structure, wherein the inner layer structure is made of super-hydrophobic material, and the outer layer structure is made of PVC, PP-R, polyethylene, galvanized pipe or stainless steel pipe. The super-hydrophobic material is an organic silicon compound or an organic fluorine compound; the pipeline has the advantages of effectively reducing the loss of a water head (pressure head) and preventing the pipeline from being accumulated with scale, green moss and blockage.
With respect to the related art among the above, the inventors consider that the following drawbacks exist; in cold regions, the water in the water pipes is subject to freezing, which may damage the pipes.
SUMMERY OF THE UTILITY MODEL
In order to reduce the possibility of water freezing, the application provides an outdoor heat-insulation water supply pipe.
The application provides an outdoor heat preservation feed pipe adopts following technical scheme:
the utility model provides an outdoor heat preservation feed pipe, includes the pipeline, be provided with the intermediate layer between pipeline inner wall and the outer wall, be provided with the heating device who is used for the heating in the intermediate layer.
By adopting the technical scheme, when the temperature is lower, the inner wall of the pipeline is heated by the heating device, the temperature of the inner wall of the pipeline is increased, the heat of the inner wall of the pipeline is transferred to the water in the pipeline, the temperature of the water is further increased, and the possibility of freezing the water is reduced; and the possibility of freezing damage to the pipeline is reduced to a certain extent.
Optionally, the heating device includes a plurality of electric heating wires arranged in the interlayer, and the electric heating wires are arranged along the length direction of the pipeline and are arranged on one side of the interlayer close to the inner wall of the pipeline; a control device for controlling the starting of the electric heating wire is arranged in the pipeline; and a partition piece for partitioning the electric heating wire and the pipeline is arranged on the electric heating wire.
By adopting the technical scheme, when the temperature is reduced, the electric heating wire is electrified, the temperature is increased after the electric heating wire is electrified, and the heat generated by the electric heating wire is transferred into water through the inner wall of the pipeline, so that the temperature of the water is increased, and the possibility of freezing the water is reduced; the plurality of electric heating wires are arranged along the length direction of the pipeline, so that the temperature of the whole pipeline can be increased to a certain extent, and the possibility of water freezing is further reduced; the electric heating wire is started through the control device according to the actual situation, so that the waste of resources is reduced; the electric heating wire and the pipeline are separated by the partition piece, so that the possibility of electric conduction of the pipeline is reduced, and the use safety of the pipeline is improved.
Optionally, the control device comprises a temperature sensor arranged in the pipeline, the temperature sensor is arranged on the inner wall of the pipeline, a controller is electrically communicated with the temperature sensor, and the controller is used for controlling the on-off of the electric heating wire.
By adopting the technical scheme, when the temperature of the water received by the temperature sensor is lower than the temperature set by the temperature sensor, the temperature sensor transmits a signal to the controller, the controller transmits the signal to the electric heating wire, and the electric heating wire is electrified, so that the temperature of the pipeline and the water is increased; when the temperature near the temperature sensor is higher than the temperature set by the temperature sensor, the controller transmits a closing signal to the electric heating wire; the electric heating wire is automatically opened or closed according to the water temperature in the process, so that the labor amount of workers is reduced; and the possibility of water freezing is reduced.
Optionally, the partition part comprises heat-conducting silica gel arranged in the interlayer, and the heat-conducting silica gel is arranged between the electric heating wire and the side wall of the pipeline interlayer.
By adopting the technical scheme, the heat-conducting silica gel has better cold and hot alternation resistance, aging resistance and electrical insulation performance. The material has excellent moisture-proof, shock-proof, corona-resistant, electric leakage-resistant and chemical medium-resistant properties; the safety of the pipeline is improved due to the arrangement of the heat-conducting silica gel.
Optionally, the interlayer is filled with a heat insulating material.
By adopting the technical scheme, after the electric heating wire heats the pipeline, the possibility of heat exchange between the inner cavity of the pipeline and the outside is reduced under the action of the heat insulating material, and the electric heating wire has certain heat insulating property, so that the temperature reduction speed of the pipeline is slowed down, and the possibility of freezing water is reduced.
Optionally, a waterproof motor is arranged in the pipeline, and blades are arranged on an output shaft of the waterproof motor.
By adopting the technical scheme, when the electric heating wire heats the pipeline, the temperature of part of water in the pipeline rises, the waterproof motor is started, the waterproof motor drives the blades to rotate, and the blades rotate to drive the water in the pipeline to do irregular motion, so that the heat exchange of the water in the pipeline is accelerated, the integral temperature of the water in the pipeline rises, and the possibility of water freezing is reduced; the blades drive the heated water to move towards the direction far away from the electric heating wires, so that the input quantity of the electric heating wires is reduced, and the input cost is reduced; the waterproof motor has waterproofness, and can work normally in water to a certain extent.
Optionally, a placing seat is arranged on the pipeline, the placing seat is arranged on the ground, a solar panel is arranged on the placing seat, a driving piece used for driving the solar panel to rotate is arranged on the placing seat, and the solar panel is used for supplying power to the electric heating wire and the waterproof motor.
By adopting the technical scheme, the solar panel converts light energy into electric energy for the waterproof motor and the electric heating wire, so that the use of conventional energy sources is reduced, and the input cost is reduced; through driving piece drive solar panel rotation, make solar panel and sun align to the at utmost for solar panel is with better angle orientation sun, and then has improved solar panel and has set up the conversion efficiency of light energy.
Optionally, the driving part comprises a first motor arranged on the placing seat, a worm is arranged on an output shaft of the first motor, the worm and the first motor output shaft are coaxially arranged, an articulated shaft is arranged on the solar panel, the length direction of the articulated shaft is perpendicular to the length direction of the first motor output shaft, and a worm wheel meshed with the worm is sleeved on the articulated shaft.
By adopting the technical scheme, the first motor is started, the first motor drives the worm to rotate, the worm rotates to drive the worm wheel to rotate, the worm wheel rotates to drive the articulated shaft to rotate, the articulated shaft rotates to drive the solar panel to rotate, and the operation is simple and practical; the worm wheel and the worm are in transmission, the solar panel is fixed to a required inclination angle, and the conversion efficiency of the solar panel to light energy is further improved.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when the temperature is lower, the inner wall of the pipeline is heated by the heating device, the temperature of the inner wall of the pipeline is increased, and the heat of the inner wall of the pipeline is transferred to the water in the pipeline, so that the temperature of the water is increased, and the possibility of freezing the water is reduced; the possibility of freezing damage of the pipeline is reduced to a certain extent;
2. when the temperature is reduced, the electric heating wire is electrified, the temperature is increased after the electric heating wire is electrified, and the heat generated by the electric heating wire is transferred into the water through the inner wall of the pipeline, so that the temperature of the water is increased, and the possibility of freezing the water is reduced; the plurality of electric heating wires are arranged along the length direction of the pipeline, so that the temperature of the whole pipeline can be increased to a certain extent, and the possibility of water freezing is further reduced; the electric heating wire is started through the control device according to the actual situation, so that the waste of resources is reduced; the arrangement of the partition piece enables the electric heating wire to be separated from the pipeline, so that the possibility of electric conduction of the pipeline is reduced, and the use safety of the pipeline is further improved;
3. when the electric heating wire heats the pipeline, the temperature of part of water in the pipeline rises, the waterproof motor is started, the waterproof motor drives the blades to rotate, and the blades rotate to drive the water in the pipeline to do irregular motion, so that the exchange of the water in the pipeline is accelerated, the integral temperature of the water in the pipeline rises, and the possibility of freezing the water is reduced; the blades drive the heated water to move towards the direction far away from the electric heating wires, so that the input quantity of the electric heating wires is reduced, and the input cost is reduced.
Drawings
FIG. 1 is a schematic diagram of the overall structure of one embodiment of the present application;
FIG. 2 is a schematic diagram of the structure of a pipe in one embodiment of the present application;
FIG. 3 is a cross-sectional view of a pipe according to an embodiment of the present application, illustrating the internal structure of the pipe;
FIG. 4 is an enlarged schematic view of portion A of FIG. 3;
figure 5 is a schematic structural diagram of a solar panel according to one embodiment of the present application.
Description of reference numerals: 1. a pipeline; 111. an outer tube; 112. an inner tube; 2. an interlayer; 3. an electric heating wire; 4. a temperature sensor; 5. a controller; 6. heat conducting silica gel; 7. a waterproof motor; 8. a blade; 9. a placing seat; 911. a base; 912. a column; 10. a solar panel; 11. a first motor; 12. a worm; 13. hinging a shaft; 14. a worm gear; 15. a screw; 16. a butt joint plate; 17. a placement groove; 18. aerogel blankets; 19. a support plate; 20. placing the plate; 21. and (7) fixing the plate.
Detailed Description
The present application is described in further detail below with reference to the attached drawings.
The embodiment of the application discloses outdoor heat preservation feed pipe. Referring to fig. 1, including a pipeline 1, an interlayer 2 is disposed between an inner wall and an outer wall of the pipeline 1, the pipeline 1 includes an outer pipe 111 and an inner pipe 112 disposed in the outer pipe 111, the inner pipe 112 is used for transporting water, the outer pipe 111 is used for shielding the inner pipe 112, and the interlayer 2 is disposed between the outer pipe 111 and the inner pipe 112.
Referring to fig. 2, the outer tube 111 is provided with a screw 15 for supporting the inner tube 112, the screw 15 is screwed to the outer tube 111, and the outer tube 111 is provided with a screw groove for screwing the screw 15.
Referring to fig. 3, a contact plate 16 is provided at one end of the screw 15 located in the interlayer 2, the contact plate 16 is provided in contact with the inner pipe 112, and four screws 15 are provided along the same circumferential wall of the outer pipe 111.
Referring to fig. 3, a heating device for heating is arranged in the interlayer 2, and is arranged on the outer wall of the inner pipe 112, and the heating device is used for heating the pipeline 1 and the conveying water in the pipeline 1; when the temperature is lower, the inner wall of the pipeline 1 is heated through the heating device, the temperature of the inner wall of the pipeline 1 is increased, and the heat of the inner wall of the pipeline 1 is transferred to the water in the pipeline 1, so that the temperature of the water is increased, and the possibility of freezing the water is reduced; and to some extent reduces the likelihood of freezing damage to the pipeline 1.
Referring to fig. 3 and 4, the heating device comprises an electric heating wire 3 arranged in the interlayer 2, the electric heating wire 3 is wound on the outer circumferential wall of the inner pipe 112, and the electric heating wire 3 is arranged around the inner pipe 112 so that water is heated more uniformly when being heated; a plurality of electric heating wires 3 are arranged along the length direction of the pipeline 1, and the pipeline 1 is divided into a plurality of heating units by the adjacent electric heating wires 3; the electric heating wire 3 is arranged on one side of the interlayer 2 close to the inner wall of the pipeline 1, and a control device for controlling the starting of the electric heating wire 3 is arranged in the pipeline 1.
Referring to fig. 3, the control device includes a temperature sensor 4 disposed in the pipeline 1, the temperature sensor 4 is disposed on the inner wall of the pipeline 1, the temperature sensor 4 is disposed on the outer wall of the inner pipe 112 and electrically connected with the temperature sensor 4 to form a controller 5, the controller 5 is connected with the temperature sensor 4 through a wire, the controller 5 is used for controlling the power on and off of the electric heating wire 3, and the controller 5 is connected with the electric heating wire 3 through a wire.
When the temperature of the water received by the temperature sensor 4 is lower than the temperature set by the temperature sensor 4, the temperature sensor 4 transmits a signal to the controller 5 through a lead, the controller 5 transmits the signal to the electric heating wire 3 through the lead, the electric heating wire 3 is powered on, and the electric heating wire 3 is powered on to heat the inner pipe 112, so that the temperature of the pipeline 1 and the water is increased, and the possibility of freezing of the water is reduced; when the temperature near the temperature sensor 4 is higher than the temperature set by the temperature sensor 4, the controller 5 transmits a signal of power-off to the electric heating wire 3 so that the temperature of the water is always in a desired range.
Referring to fig. 3 and 4, a partition member for partitioning the electric heating wire 3 from the pipeline 1 is arranged on the electric heating wire 3, the partition member comprises heat-conducting silica gel 6 arranged in the interlayer 2, and the heat-conducting silica gel 6 is arranged between the electric heating wire 3 and the side wall of the interlayer 2 of the pipeline 1; seted up standing groove 17 on the periphery wall along inner tube 112, standing groove 17's cross-section is circularly, and heat conduction silica gel 6 sets up in standing groove 17, and heat conduction silica gel 6 is laminated with the diapire of standing groove 17, and electric heating wire 3 is around establishing on heat conduction silica gel 6.
The arrangement of the heat-conducting silica gel 6 enables the electric heating wire 3 and the pipeline 1 to be separated, the possibility of electric conduction of the pipeline 1 is reduced, and the use safety of the pipeline 1 is further improved.
Referring to fig. 3, in order to reduce the loss of water heat, the interlayer 2 is filled with a heat insulating material, which includes a porous material, a heat reflecting material, a vacuum material, and the like, in this embodiment, the heat insulating material is selected to be aerogel blanket 18; the aerogel blanket 18 is a flexible heat-insulating blanket which is formed by compounding nano silicon dioxide aerogel serving as a main body material with glass fiber cotton or a pre-oxidized fiber blanket. The aerogel blanket 18 has the advantages of low thermal conductivity, and certain tensile and compressive strength.
Referring to fig. 3, a waterproof motor 7 is arranged in the pipeline 1, the waterproof motor 7 is arranged in the inner pipe 112, a support plate 19 is arranged across the inner pipe 112, two ends of the support plate 19 are arranged on the inner wall of the inner pipe 112, the waterproof motor 7 is arranged on the support plate 19, a blade 8 is arranged on an output shaft of the waterproof motor 7, and the waterproof motor 7 is arranged at a position close to the electric heating wire 3.
When the electric heating wire 3 heats the pipeline 1, the temperature of part of water in the pipeline 1 rises, the waterproof motor 7 is started, the waterproof motor 7 drives the blades 8 to rotate, the blades 8 rotate to drive the water in the pipeline 1 to do irregular motion, and then the exchange of the water in the pipeline 1 is accelerated, so that the overall temperature of the water in the pipeline 1 rises, and the possibility of freezing the water is reduced.
Referring to fig. 1 and 5, to reduce the investment of conventional energy sources: a placing seat 9 is arranged on the pipeline 1, the placing seat 9 is fixedly arranged on the ground, a solar panel 10 is arranged on the placing seat 9, the solar panel 10 is used for supplying power to an electric heating wire and the waterproof motor 7, the placing seat 9 comprises a base 911 and a vertical column 912 vertical to the base 911, the solar panel 10 is arranged at the end part of the vertical column 912 far away from the placing seat 9, and a driving part for driving the solar panel 10 to rotate is arranged on the base 911; a standby power supply is arranged on the placing seat 9 and used for supplying power to the waterproof motor 7 and the electric heating wire 3; the backup power source is a rechargeable battery in electrical communication with solar panel 10.
Referring to fig. 1 and 5, the driving member includes a first motor 11 disposed on the placement seat 9, a placement plate 20 is disposed on the column 912, the placement plate 20 is perpendicular to the column 912, the first motor 11 is disposed on the placement plate 20, a worm 12 is disposed on an output shaft of the first motor 11, the worm 12 is coaxially disposed with the output shaft of the first motor 11, a hinge shaft 13 is disposed on the solar panel 10, two fixing plates 21 are disposed on the solar panel 10, the two fixing plates 21 are all perpendicular to the solar panel 10, the hinge shaft 13 is fixedly disposed between the two fixing plates 21, a through groove for disposing the hinge shaft 13 is disposed on the column 912, the hinge shaft 13 is rotatably disposed in the through groove, the length direction of the hinge shaft 13 is perpendicular to the length direction of the output shaft of the first motor 11, and a worm wheel 14 meshed with the worm.
Start first motor 11, first motor 11 drive worm 12 rotates, and worm 12 rotates and drives worm wheel 14 and rotate, and worm wheel 14 rotates and drives articulated shaft 13 and rotate, and articulated shaft 13 rotates and drives solar panel 10 and rotate, makes solar panel 10 align with the sun to the at utmost for solar panel 10 is with better angle towards the sun, and then has improved solar panel 10 and has set the conversion efficiency of light energy.
The implementation principle of this application embodiment outdoor heat preservation feed pipe does:
when the temperature sensor 4 receives that the temperature of the water is lower than the temperature set by the temperature sensor 4, the temperature sensor 4 transmits a signal to the controller 5 through a lead, the controller 5 transmits the signal to the electric heating wire 3 through the lead, the electric heating wire 3 is powered on, and the electric heating wire 3 is powered on to heat the inner pipe 112; then, the waterproof motor 7 is started, the waterproof motor 7 drives the blades 8 to rotate, the blades 8 rotate to drive the water in the pipeline 1 to do irregular movement, and therefore the exchange of the water in the pipeline 1 is accelerated, and the overall temperature of the water in the pipeline 1 is increased.
In daytime, the first motor 11 is started, the first motor 11 drives the worm 12 to rotate, the worm 12 rotates to drive the worm wheel 14 to rotate, the worm wheel 14 rotates to drive the hinge shaft 13 to rotate, the hinge shaft 13 rotates to drive the solar panel 10 to rotate, and the solar panel 10 is aligned with the sun to the maximum extent; the solar panel 10 converts light energy into energy, part of the electric energy is used for the work of the waterproof motor 7, the first motor 11 and the electric heating wire 3, and the other part of the electric energy is stored in the standby power supply.
At night, the standby power supply supplies power to the waterproof motor 7 and the electric heating wire 3, so that the possibility of water freezing is reduced.
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 (6)
1. The utility model provides an outdoor heat preservation feed pipe, includes pipeline (1), its characterized in that: an interlayer (2) is arranged between the inner wall and the outer wall of the pipeline (1), and a heating device for heating is arranged in the interlayer (2); a waterproof motor (7) is arranged in the pipeline (1), and a blade (8) is arranged on an output shaft of the waterproof motor (7); be close to be provided with on pipeline (1) and place seat (9), place seat (9) and set up subaerial, be provided with solar panel (10) on placing seat (9), be provided with on placing seat (9) and be used for driving solar panel (10) pivoted driving piece, solar panel (10) are used for supplying power to waterproof motor (7).
2. The outdoor heat-insulating water supply pipe according to claim 1, characterized in that: the heating device comprises a plurality of electric heating wires (3) arranged in the interlayer (2), the electric heating wires (3) are arranged along the length direction of the pipeline (1), and the electric heating wires (3) are arranged on one side, close to the inner wall of the pipeline (1), in the interlayer (2); a control device for controlling the starting of the electric heating wire (3) is arranged in the pipeline (1); and a partition piece for separating the electric heating wire (3) from the pipeline (1) is arranged on the electric heating wire (3).
3. An outdoor heat-insulating water supply pipe according to claim 2, characterized in that: the control device comprises a temperature sensor (4) arranged in the pipeline (1), the temperature sensor (4) is arranged on the inner wall of the pipeline (1), a controller (5) is electrically communicated with the temperature sensor (4), and the controller (5) is used for controlling the power-on and power-off of the electric heating wire (3).
4. An outdoor heat-insulating water supply pipe according to claim 2, characterized in that: the partition piece comprises heat-conducting silica gel (6) arranged in the interlayer (2), and the heat-conducting silica gel (6) is arranged between the electric heating wire (3) and the side wall of the interlayer (2) of the pipeline (1).
5. The outdoor heat-insulating water supply pipe according to claim 1, characterized in that: and the interlayer (2) is filled with heat insulation materials.
6. The outdoor heat-insulating water supply pipe according to claim 1, characterized in that: the driving piece is including setting up first motor (11) on placing seat (9), be provided with worm (12) on the output shaft of first motor (11), worm (12) and first motor (11) output shaft coaxial line set up, be provided with articulated shaft (13) on solar panel (10), the length direction of articulated shaft (13) length direction perpendicular to first motor (11) output shaft, the cover is equipped with worm wheel (14) with worm (12) meshing on articulated shaft (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022129209.1U CN213206815U (en) | 2020-09-24 | 2020-09-24 | Outdoor heat-insulation water supply pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022129209.1U CN213206815U (en) | 2020-09-24 | 2020-09-24 | Outdoor heat-insulation water supply pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213206815U true CN213206815U (en) | 2021-05-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022129209.1U Expired - Fee Related CN213206815U (en) | 2020-09-24 | 2020-09-24 | Outdoor heat-insulation water supply pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213206815U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115059825A (en) * | 2022-07-20 | 2022-09-16 | 中水净通(西藏)高原供水科技发展有限公司 | Photo-thermal phase change anti-freezing device for frozen soil section tap water pipe vertical pipe |
-
2020
- 2020-09-24 CN CN202022129209.1U patent/CN213206815U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115059825A (en) * | 2022-07-20 | 2022-09-16 | 中水净通(西藏)高原供水科技发展有限公司 | Photo-thermal phase change anti-freezing device for frozen soil section tap water pipe vertical pipe |
| CN115059825B (en) * | 2022-07-20 | 2024-02-23 | 中水净通(西藏)高原供水科技发展有限公司 | Photo-thermal phase-change antifreezing device for frozen soil section running water pipe vertical pipe |
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Granted publication date: 20210514 |