Low temperature environment pre-stressed pipeline temperature control device and method

Abstract

A temperature control device and method for prestressed pipelines in low-temperature environments, belonging to the field of engineering construction, is disclosed. The device includes a pipeline; a heating tape is spirally wound around the outer side of the pipeline; the heating tape is fixed to the outer side of the pipeline by adhesive tape; and an insulation layer is provided on the outer side of the heating tape. The adhesive tape is heat-resistant aluminum foil tape. Multiple tapes are arranged along the length of the pipeline, completely covering the outer wall of the pipeline. This invention reduces the temperature difference between the pipeline ends and the middle section during pipeline preheating, ensuring the quality of subsequent operations. Furthermore, by fixing the heating tape with aluminum foil tape, the aluminum foil reflects heat, reducing heat loss and shortening the pipeline preheating time.

Description

Technical Field

[0001] This invention relates to a temperature control device and method for prestressed pipelines in low-temperature environments, belonging to the field of engineering construction. Background Technology

[0002] During construction, it is necessary to ensure that the temperature of the prestressed ducts and the grout poured inside them is preheated. In cold environments, heating tape is usually wrapped around the outside of the ducts to raise and maintain the temperature. However, when only heating tape is used, the end of the duct away from the hot air blower constantly exchanges heat with the cold outside air, resulting in a relatively low temperature at the end of the duct. This temperature difference within the duct can easily affect the quality of subsequent construction, so it is necessary to improve this method. Summary of the Invention

[0003] The purpose of this invention is to solve the above-mentioned problems existing in the background art and to provide a temperature control device for prestressed pipelines in low-temperature environments.

[0004] The present invention achieves the above objectives by adopting the following technical solution:

[0005] A temperature control device for prestressed pipelines in low-temperature environments includes a pipeline; a heat tracing cable is spirally wound around the outside of the pipeline; the heat tracing cable is fixed to the outside of the pipeline by tape; and an insulation layer is provided on the outside of the heat tracing cable.

[0006] A method for using a temperature control device for prestressed ducts in low-temperature environments, the method comprising the following steps:

[0007] Step 1: Connect the pipes, heating tape, adhesive tape, and insulation layer from the inside out, and insert the outer shell onto the outside of the insulation layer;

[0008] Step 2: Then start the hot air blower to heat the pipes, and use the distribution device to disperse the hot airflow and reduce the temperature difference between the two ends of the pipes;

[0009] Step 3: After reaching the predetermined temperature, turn off the hot air blower, remove the diversion device, and then inject grout into the pipe. Compared with the prior art, the beneficial effects of the present invention are: During pipe preheating, the present invention can reduce the temperature difference between the pipe end and the middle section of the pipe through the diversion device, ensuring the quality of subsequent operations. At the same time, the outer cylinder of the diversion device of the present invention is set on the outside of the cylinder, reducing the gap between the cylinder and the pipe. When the airflow passes through, it can accelerate the mixing of airflows of different temperatures, so as to quickly increase the temperature of the two airflows after mixing. Attached Figure Description

[0010] Figure 1 This is a front sectional view of a temperature control device for prestressed pipelines in a low-temperature environment according to the present invention.

[0011] Figure 2This is a cross-sectional view of a flow divider device of a prestressed pipeline temperature control device for low-temperature environments according to the present invention;

[0012] Figure 3 This is a schematic diagram of the structure of a flow divider in a prestressed pipeline temperature control device for low-temperature environments according to the present invention;

[0013] Figure 4 This is a side view of the partition layer of a prestressed pipe temperature control device for low-temperature environments according to the present invention;

[0014] Figure 5 This is a side view of the outer cylinder, inner cylinder, fan blade, and swivel blade connection structure of a prestressed pipeline temperature control device for low-temperature environments according to the present invention. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0016] Specific implementation method one: as follows Figures 1-5 As shown in the figure, this embodiment describes a temperature control device for prestressed pipelines in low-temperature environments, including a pipeline 5; a heating cable 4 is spirally wound around the outside of the pipeline 5; the heating cable 4 is fixed to the outside of the pipeline 5 by tape 3; and an insulation layer 2 is provided on the outside of the heating cable 4. The heating cable 4 heats the pipeline 5.

[0017] Insulation layer 2 is asphalt insulation cotton.

[0018] The space between the tracing troughs is 20cm.

[0019] The tape 3 is a heat-resistant aluminum foil tape. The tape 3 can transfer the heat generated by the heating cables 4 to the gap between the two heating cables 4 through the aluminum foil, making the temperature of the pipe 5 more uniform. At the same time, the aluminum foil can also reduce heat loss.

[0020] The tape 3 is arranged along the length of the pipe 5. Multiple tapes 3 are provided, and the multiple tapes 3 completely wrap the outer wall of the pipe 5.

[0021] The pipe 5 is equipped with a diversion device 6 inside; the diversion device 6 includes multiple cylinders 62; the multiple cylinders 62 are spaced apart inside the pipe 5, and a diverter is provided between two adjacent cylinders 62. The inner wall of each cylinder 62 is fixedly connected to a connecting rod 63 by a fixing rod 64; one end of the connecting rod 63 is fixedly connected to the inner shell 74; a partition layer 73 is provided on the outer side of the inner shell 74; multiple partition plates 72 are fixedly connected to the outer and inner sides of the partition layer 73. The partition plates 72 located on the inner side of the partition layer 73 are fixedly connected to the outer circular surface of the inner shell 74, and the partition plates 72 located on the outer side of the partition layer 73 are fixedly connected to the outer circular surface of the outer shell 71; the outer shell 71 is inserted into the outer side of the insulation layer 2; the inner shell 74 is provided with a perforation I 76, the partition layer 73 is provided with a perforation II 77, and the outer shell 71 is provided with a perforation III 75. The airflow that moves through the circular tube 62 to the inner shell 74 position partially moves into the gap between the circular tube 62 and the pipe 5, and partially passes through the perforation I 76 into the space between the inner shell 74 and the partition layer 73, flows between the partition plates 72, then flows through the perforation II 77 to the space between the partition plate 73 and the outer shell 71, flows between the partition plates 72, and finally exits through the perforation III 75, so that the temperature between the outer shell 71 and the inner shell 74 remains stable, thereby ensuring the temperature at the end of the pipe 5.

[0022] Multiple partition plates 72 form channels for airflow on the outer and inner surfaces of the partition layer 73. This is used to ensure the temperature at the end of the pipe 5.

[0023] A conical barrel 61 is fixedly connected to the end of the cylindrical 62 away from the outer shell 71, and the side of the conical barrel 61 is connected to the air outlet of the hot air blower 1.

[0024] Each of the aforementioned distributors includes an outer cylinder 66 and an inner cylinder 69; one end of the outer cylinder 66 is connected to the end of the cylindrical cylinder 62 away from the conical barrel 61 via a bearing, and a plurality of fixing rods 68 are fixedly connected to the inner wall of the other end of the outer cylinder 66, and the other end of the fixing rods 68 is fixedly connected to the inner cylinder 69; a plurality of fan blades 65 are fixedly connected to the outer wall of the cylindrical cylinder 62; an arc-shaped plate 67 is fixedly connected to the end face of the connection between the cylindrical cylinder 62 and the outer cylinder 66; and a swivel blade 70 is fixedly connected to the inner wall of the inner cylinder 69. The rotation of the fan blade 65 can drive airflow, and the position near the conical barrel 61 is more affected by the wind and rotates faster, which can drive more gas from inside the cylinder 62 to the gap between the cylinder 62 and the pipe 5, so as to mix with the cooler airflow near the conical barrel 61 in the gap between the cylinder 62 and the pipe 5, thus significantly increasing the airflow temperature. The fan blade 70, which is further away from the conical barrel 61, is less affected by the wind and rotates relatively slower, driving less gas from inside the cylinder 62 to the gap between the cylinder 62 and the pipe 5, so as to mix with the relatively warmer airflow far away from the conical barrel 61 in the gap between the pipe 5 and the cylinder 62, thus slightly increasing the airflow temperature and reducing the temperature difference between the two ends of the pipe 5.

[0025] The cylinder 62 is coaxial with the pipe 5.

[0026] When the fan blade 65 rotates, it draws the airflow inside the cylinder 62 into the gap between the cylinder 62 and the pipe 5.

[0027] A method for using a temperature control device for prestressed ducts in low-temperature environments, the method comprising the following steps:

[0028] Step 1: Connect the pipe 5, heating tape 4, tape 3 and insulation layer 2 from the inside to the outside in sequence, and insert the outer shell 71 into the outside of the insulation layer 2;

[0029] Step 2: Then start the hot air blower 1 to heat the pipe 5, and disperse the hot air flow through the diversion device 6 to reduce the temperature difference between the two ends of the pipe 5;

[0030] Step 3: After reaching the predetermined temperature, turn off the hot air blower 1, remove the diversion device 6, and then inject grout into the pipe 5.

[0031] The working principle of this invention is as follows: the pipe 5, the heat tracing cable 4, the tape 3 and the insulation layer 2 are connected sequentially from the inside to the outside, and the outer shell 71 is inserted into the outside of the insulation layer 2.

[0032] Then, the hot air blower 1 is started. The airflow enters the cylinder 62 through the conical barrel 61. Some of the hot airflow moves to the inner shell 74, where it is blocked and flows in the opposite direction into the gap between the circular tube 62 and the pipe 5, heating the pipe 5. When the airflow moves to the distributor position inside the circular tube 62, it pushes the swivel blade 70. The swivel blade 70 has a similar structure to a fan blade. After being pushed by the airflow, the swivel blade 70 drives the inner cylinder 69, the fixed rod 68, and the outer cylinder 66 to rotate. During the rotation, the inner cylinder 69 drives the fan blade 65 to rotate. The blade 65 draws airflow to the space between the cylinder 62 and the pipe 5, where it mixes with the airflow between the cylinder 62 and the pipe 5. Since the airflow inside the cylinder 62 does not come into contact with the pipe 5, less heat is lost during the flow. Therefore, the temperature of the airflow inside the cylinder 62 is higher than the temperature of the airflow in the gap between the cylinder 62 and the pipe 5. After mixing, the temperature of the airflow in the gap between the cylinder 62 and the pipe 5 can be increased, thereby allowing the airflow in the gap between the cylinder 62 and the pipe 5 to exchange more heat with the pipe 5, thus increasing the temperature of the pipe 5.

[0033] Since multiple distributors are provided along the length of pipe 5, and each distributor receives a portion of the airflow from the circular pipe 62 to the gap between the circular pipe 62 and pipe 5, the gas volume in the circular pipe 62 decreases and the flow velocity slows down from the direction closer to the conical barrel 61 to the direction farther away from the conical barrel 61. Therefore, the rotation speed of the swivel blades 70 on the distributors closer to the conical barrel 61 is greater than that on the distributors farther away from the conical barrel 61. Consequently, the rotation speed of the fan blades 65 on the distributors closer to the conical barrel 61 is greater than that on the distributors farther away from the conical barrel 61. This allows the distributors closer to the conical barrel 61 to divert more hot airflow to the gap between the circular barrel 62 and pipe 5 during operation. When the airflow flows in the gap between the cylinder 62 and the pipe 5, it flows from away from the conical barrel 61 to closer to the conical barrel 61. As the flow distance increases, the temperature of the airflow in the gap between the cylinder 62 and the pipe 5 gradually decreases. That is, the airflow temperature is lower the closer it is to the conical barrel 61. When the flow is split in the above manner, the airflow with lower temperature closer to the conical barrel 61 can mix with more airflow flowing out from the inside of the cylinder 62, so as to increase the temperature of the airflow in the gap between the cylinder 62 and the pipe 5 as much as possible. On the other hand, the airflow with relatively higher temperature farther away from the conical barrel 61 will mix with less hot airflow flowing out from the inside of the cylinder 62, slightly increasing the temperature of the airflow in the gap between the cylinder 62 and the pipe 5, thereby reducing the temperature difference between the two ends of the pipe 5.

[0034] The outer cylinder 66 is located outside the cylinder 62, which reduces the gap between the cylinder 62 and the pipe 5. When the airflow passes through the small gap, it can accelerate the mixing of airflows at different temperatures, so as to quickly increase the temperature of the two airflows after mixing.

[0035] After reaching the predetermined temperature, turn off the hot air blower 1, remove the diversion device 6, and then inject grout into the pipe 5.

[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A temperature control device for prestressed pipelines in low-temperature environments, characterized in that: Includes a pipe (5); the outer side of the pipe (5) is spirally wrapped with a heat tracing cable (4); the heat tracing cable (4) is fixed to the outer side of the pipe (5) by tape (3); the outer side of the heat tracing cable (4) is provided with a heat insulation layer (2).

2. The temperature control device for prestressed pipelines in low-temperature environments according to claim 1, characterized in that: The tape (3) is a heat-resistant aluminum foil tape.

3. The temperature control device for prestressed pipelines in low-temperature environments according to claim 2, characterized in that: The tape (3) is arranged along the length of the pipe (5), and there are multiple tapes (3), and the multiple tapes (3) completely wrap the outer wall of the pipe (5).

4. The temperature control device for prestressed pipelines in low-temperature environments according to claim 3, characterized in that: The pipe (5) is equipped with a flow divider (6) inside; the flow divider (6) includes multiple cylinders (62); the multiple cylinders (62) are spaced apart inside the pipe (5), and a flow divider is provided between two adjacent cylinders (62); the inner wall of each cylinder (62) is fixedly connected to a connecting rod (63) by a fixing rod (64); one end of the connecting rod (63) is fixedly connected to an inner shell (74); a partition layer (73) is provided on the outer side of the inner shell (74); the partition layer (73) Multiple partition plates (72) are fixedly connected to both the outer and inner sides. The partition plate (72) located on the inner side of the partition layer (73) is fixedly connected to the outer circular surface of the inner shell (74), and the partition plate (72) located on the outer side of the partition layer (73) is fixedly connected to the outer circular surface of the outer shell (71). The outer shell (71) is inserted into the outer side of the insulation layer (2). The inner shell (74) is provided with perforation I (76), the partition layer (73) is provided with perforation II (77), and the outer shell (71) is provided with perforation III (75).

5. The temperature control device for prestressed pipelines in low-temperature environments according to claim 4, characterized in that: The plurality of the partition plates (72) form channels for airflow on the outer and inner sides of the partition layer (73).

6. The temperature control device for prestressed pipelines in low-temperature environments according to claim 5, characterized in that: A conical barrel (61) is fixedly connected to the end of the cylinder (62) away from the outer shell (71), and the side of the conical barrel (61) is connected to the air outlet of the hot air blower (1).

7. The temperature control device for prestressed pipelines in low-temperature environments according to claim 6, characterized in that: Each of the aforementioned distributors includes an outer cylinder (66) and an inner cylinder (69); one end of the outer cylinder (66) is connected by a bearing to the end of a cylindrical section (62) away from the conical barrel (61), and a plurality of fixing rods (68) are fixedly connected to the inner wall of the other end of the outer cylinder (66), and the other end of the fixing rods (68) is fixedly connected to the inner cylinder (69); a plurality of fan blades (65) are fixedly connected to the outer wall of the cylindrical section (62); an arc-shaped plate (67) is fixedly connected to the end face of the connection between the cylindrical section (62) and the outer cylinder (66); and a swivel blade (70) is fixedly connected to the inner wall of the inner cylinder (69).

8. The temperature control device for prestressed pipelines in low-temperature environments according to claim 7, characterized in that: The cylinder (62) is coaxial with the pipe (5).

9. A temperature control device for prestressed pipelines in low-temperature environments according to claim 8, characterized in that: When the fan blade (65) rotates, it draws the airflow inside the cylinder (62) into the gap between the cylinder (62) and the pipe (5).

10. The method of using the temperature control device for prestressed pipelines in low-temperature environments according to claim 9, characterized in that: The method of use includes the following steps: Step 1: Connect the pipe (5), heating tape (4), tape (3) and insulation layer (2) from the inside to the outside, and insert the outer shell (71) into the outside of the insulation layer (2); Step 2: Then start the hot air blower (1) to heat the pipe (5), and disperse the hot air flow through the diversion device (6) to reduce the temperature difference between the two ends of the pipe (5); Step 3: After reaching the predetermined temperature, turn off the hot air blower (1), remove the diversion device (6), and then inject grout into the pipe (5).

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