Polyurethane directly-buried thermal insulation pipe

Abstract

The invention relates to the technical field of thermal insulation pipes, in particular to a polyurethane directly-buried thermal insulation pipe which comprises a conveying pipe, an outer pipe and a thermal insulation layer, a plurality of connecting rods are arranged at the two ends of the outer pipe, and a thermal insulation gap is reserved between the outer pipe and the thermal insulation layer; an annular dehumidification area is arranged between the outer pipe and the inner pipe, a moisture discharging pipe is fixedly installed on the outer wall of the outer pipe, a communicating pipe is arranged on the outer pipe, an adsorption assembly used for absorbing water vapor in the heat preservation gap is arranged in the dehumidification area, an annular heating area which is not covered with a heat preservation layer is arranged on the conveying pipe, and the heating area is located below the adsorption assembly. After water vapor in air in the heat preservation gap is adsorbed through the adsorption assembly, the heating area automatically heats the adsorption assembly, the water adsorbed by the adsorption assembly is evaporated and then discharged out of the heat preservation pipeline from the communicating pipe, the heat preservation effect of the heat preservation pipeline is guaranteed, the adsorption assembly does not need to be manually cleaned, and the heat preservation efficiency is improved. And long-term effective use of the adsorption assembly is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of thermal insulation pipes, in particular to a polyurethane direct-buried thermal insulation pipe. Background Art

[0002] Insulated pipe is the abbreviation of insulated pipe. Insulated pipe is often used for the thermal insulation transportation of liquid, gas and other media, and is widely used in the fields of petroleum, chemical industry, hot spring, central heating, etc. With the promotion of central heating by the country, the use of direct buried insulated pipe is increasing, and the scope of use is also becoming wider and wider.

[0003] Directly buried thermal insulation pipes buried in the soil are beneficial to protecting the thermal insulation pipes. At the same time, they are also good for saving surface space and keeping the city clean and beautiful. Moreover, the land absorbs the sun's heat during the day and also has a heat preservation effect at night, which is more conducive to improving the thermal insulation effect of the thermal insulation pipes.

[0004] The inside of the insulation pipe is provided with an insulation layer made of insulation cotton or polyurethane foam, which is used to insulate the pipe. However, during long-term use, moisture in the ground may enter the insulation pipe from the gap of the pipe and adhere to the insulation layer, causing the insulation effect of the insulation pipe to deteriorate; or after air enters the insulation pipe, the moisture in the air inside the insulation pipe forms water droplets under the action of temperature difference and adheres to the insulation layer, causing the insulation effect of the insulation pipe to deteriorate.

[0005] In order to solve the problem that moisture adheres to the insulation layer and affects the insulation effect of the insulation pipe, the Chinese invention patent with application number: CN202111040171.3 and the name of "Prefabricated Direct-Buried Insulation Pipe" proposes a solution, including a pre-buried installation frame, a ring-shaped protective plate for supporting the insulation pipe is fixedly connected at the inner center of the pre-buried installation frame, a supporting seat with a separation function is arranged inside the annular protective plate, an insulation pipe seat is installed inside the annular protective plate, and insulation cotton with insulation function is arranged inside the insulation pipe seat, and an adding mechanism with an adding function is movably connected on the surface of the insulation pipe seat and located inside the annular protective plate, and a recovery seat with a placement function is installed inside the pre-buried installation frame, and the pre-buried installation frame includes a connecting bracket seat, and the number of the connecting bracket seats is three. When in use, the effect of automatically absorbing water vapor from the insulation cotton according to the changes in the external environment is achieved, avoiding the problem that the insulation cotton is affected by too much moisture and affects its own use.

[0006] The above patent uses an adding mechanism to blow activated carbon powder into one side of the insulation cotton to absorb the water vapor on the insulation cotton, thereby ensuring the dryness of the insulation cotton and further ensuring the insulation effect of the insulation pipe.

[0007] Although the above patent absorbs the moisture adhered to the insulation cotton by blowing in activated carbon powder, it guarantees the insulation effect of the insulation pipe to a certain extent. However, the above patent does not recycle the activated carbon powder, and it needs to be recycled manually. The activated carbon powder cannot be recycled automatically. The direct buried insulation pipe is buried in the ground, and it is difficult to clean the activated carbon powder manually. After the activated carbon powder enters the insulation pipe, although it absorbs the moisture on the insulation cotton, the moisture is still in the activated carbon and cannot be discharged from the outside of the insulation pipe in time, which will still have a certain impact on the insulation effect of the insulation pipe. When the activated carbon is saturated, the activated carbon fails. In order to ensure the dryness of the insulation cotton, the activated carbon powder can only be blown into the inside. In this way, when the space between the insulation layer and the insulation pipe is filled with activated carbon, the activated carbon and the moisture absorbed inside will serve as a medium to connect the insulation layer and the outer wall of the insulation pipe, thereby reducing the insulation effect of the insulation pipe.

[0008] To this end, a polyurethane direct-buried insulation pipe is proposed, which automatically absorbs the moisture between the outer pipe and the insulation layer of the insulation pipe, and discharges the absorbed moisture outside the insulation pipe, thereby reducing the accumulation of moisture on the insulation layer and ensuring the insulation effect. This solves the problem that the insulation layer of the insulation pipe is affected by moisture accumulation. Summary of the invention

[0009] The purpose of the present invention is to provide a polyurethane direct-buried thermal insulation pipe, which automatically absorbs moisture between the outer tube of the thermal insulation pipe and the thermal insulation layer, and discharges the absorbed moisture to the outside of the thermal insulation pipe, thereby reducing the accumulation of moisture on the thermal insulation layer and ensuring the thermal insulation effect, so as to solve the problem of the thermal insulation layer of the thermal insulation pipe proposed in the above background technology affecting the thermal insulation effect due to moisture accumulation.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] A polyurethane direct-buried thermal insulation pipe comprises a conveying pipe, an outer pipe and an insulation layer, wherein the outer pipe is coaxially sleeved on the outside of the conveying pipe, a plurality of connecting rods are arranged at both ends of the outer pipe, the outer pipe is fixedly connected to the conveying pipe by the connecting rods, the insulation layer is coaxially coated on the outer wall of the outer pipe, and an insulation gap is left between the outer pipe and the insulation layer; an annular dehumidification zone is arranged between the outer pipe and the inner pipe, a dehumidification pipe is fixedly installed on the outer wall of the outer pipe, a connecting pipe for connecting the dehumidification pipe and the dehumidification zone is arranged on the outer pipe, an adsorption component for absorbing water vapor in the insulation gap is arranged inside the dehumidification zone, an annular heating zone not covered by the insulation layer is arranged on the conveying pipe, the heating zone is located in the dehumidification zone, and the heating zone is located below the adsorption component.

[0012] The adsorption component absorbs the moisture in the air inside the insulation gap to prevent the moisture content in the air inside the insulation gap from being too high and condensing into water droplets on the surface of the insulation layer, thereby preventing the insulation effect of the insulation layer on the conveying pipe from being affected. The heating zone can use the heat emitted by the conveying pipe to heat the adsorption component. After the adsorption component adsorbs the moisture in the air inside the insulation gap, the heating zone heats the adsorption component. The water vapor adsorbed by the adsorption component will be heated and evaporated inside the dehumidification zone. Finally, because the temperature of the dehumidification zone is higher than the temperature of the dehumidification pipe, and the dehumidification pipe is connected to the dehumidification zone, the water vapor can enter the dehumidification pipe through the connecting pipe and be discharged from the insulation gap from the dehumidification pipe. In this way, the adsorption component can be automatically cleaned to ensure that the adsorption component has a lasting adsorption force on the water vapor inside the insulation gap, and ensure that the insulation effect of the insulation layer on the conveying pipe will not be affected by the condensation of water vapor on the insulation layer.

[0013] Preferably, the adsorption component includes a sleeve coaxially sleeved on the thermal insulation layer, and a water-absorbing ring for absorbing water vapor is fixed on the outer ring of the sleeve. The water-absorbing ring can be made of a water-absorbing sponge, or it can be made of absorbent paper, activated carbon or other materials that can absorb moisture in the air. The sleeve is provided with a plurality of through holes, and the through holes are all oriented in the axial direction of the sleeve, and the plurality of through holes are evenly arranged on the sleeve. The sleeve is sleeved on the heating zone, and the heating zone heats the sleeve with the heat emitted, and the sleeve then transfers the heat to the water-absorbing ring to heat the water-absorbing ring, thereby evaporating the moisture adsorbed by the water-absorbing ring. The through holes enable the heat emitted by the heating zone to directly contact the water-absorbing ring to heat the water-absorbing ring, which helps to improve the efficiency of heating the water-absorbing ring.

[0014] Preferably, the sleeve ring is slidably installed on the outside of the insulation layer, a screw rod is arranged inside the insulation gap, the screw rod is arranged along the axial direction of the conveying pipe, a driving motor for driving the screw rod to rotate forward or reverse is arranged inside the dehumidification zone, a power supply for powering the driving motor is also arranged inside the dehumidification zone, the water absorption ring is connected to the screw rod through a ball screw nut, a humidity sensor for detecting the humidity inside the insulation gap is arranged inside the insulation gap, and the humidity sensor is electrically connected to the driving motor and the power supply respectively; when the driving motor rotates, the water absorption ring moves along the axial direction of the conveying pipe.

[0015] The driving motor controls the screw rod to drive the water absorption ring to reciprocate along the axis of the conveying pipe, so that the water absorption ring can better contact the air inside the insulation gap during the movement, thereby improving the water absorption efficiency and absorption effect of the water absorption ring on the moisture in the air in the insulation gap, further ensuring the dryness inside the insulation gap and the insulation effect of the insulation pipe. The problem of fixing the water absorption ring in a certain place and being unable to dry the position far away from the water absorption ring is avoided.

[0016] Preferably, a sealing component for sealing the heating zone is also provided in the dehumidification zone, and the sealing component includes a sealing ring slidably sleeved on the insulation layer, and the sealing ring is made of polyurethane foam, and the sealing ring is located inside the dehumidification zone; a reset spring is also provided inside the dehumidification zone along the axial direction of the delivery pipe, and one end of the reset spring is fixedly connected to the connecting rod, and the other end is fixedly connected to the sealing ring; when the reset spring is in a natural state, the sealing ring is located above the heating zone and seals the heating zone. The reset spring cooperates with the sealing ring to seal the heating zone, ensuring that the heat emitted by the heating zone when the motor drives the water absorption ring to reciprocate will not be emitted from the connecting pipe to the outside of the insulation gap, avoiding the heat loss and waste of the liquid transported by the delivery pipe, and further ensuring the overall insulation effect of the insulation pipe. When the water absorption ring has absorbed the moisture in the air in the insulation gap, the motor drives the sleeve ring and the water absorption ring to move to the heating zone, and the sleeve ring squeezes the sealing ring under the drive of the motor and the screw rod, and pushes the sealing ring away from the heating zone along the axial direction of the delivery pipe, and the reset spring is compressed. The water absorption ring is aligned with the heating zone, and the heat emitted by the conveying pipeline is used to heat the water absorption ring, so that the water absorbed by the water absorption ring is evaporated and discharged from the connecting pipe into the dehumidification pipe.

[0017] Preferably, there are two dehumidification zones, which are respectively arranged at the two ends of the outer tube, and are symmetrically arranged about the central cross section of the conveying tube. There are also two heating zones, which are respectively located in the two dehumidification zones; there are also two connecting pipes, which respectively connect the two dehumidification zones with the dehumidification pipe. A closed component is arranged inside each dehumidification zone, and the two closed components are symmetrically arranged about the central cross section of the conveying tube. An annular baffle is coaxially fixedly installed on the sleeve, and the outer ring of the baffle abuts against the inner wall of the outer tube. The baffle is located in the middle of the sleeve, and the baffle evenly divides the water absorption ring into two layers, front and back. The baffle is made of a material with low thermal conductivity, such as foamed polyurethane, aerogel, etc. There are two dehumidification zones and heating zones, so that the water absorption ring can enter the dehumidification zone for heating and dehumidification after moving to one side, which helps to increase the rate of discharging water vapor from the insulation gap.

[0018] The water absorption ring is divided into two layers, front and back, by a baffle plate so that each time the water absorption ring moves to a dehumidification zone, the layer facing the dehumidification zone enters the dehumidification zone and is aligned with the heating zone in the dehumidification zone, while the other layer remains outside the dehumidification zone. This is because when the water absorption ring is heated to evaporate the water vapor adsorbed by the water absorption ring, the water absorption ring's adsorption effect on water vapor will decrease. By dividing the water absorption ring into two layers, it can be ensured that each time the water absorption ring is heated, the water absorption ring on the other side can continue to adsorb water vapor in the air inside the insulation gap, thereby further improving the dehumidification efficiency inside the insulation gap. In addition, due to the obstruction of the baffle plate, the baffle plate separates the dehumidification zone from the insulation gap outside the dehumidification zone, which can reduce the water vapor evaporated from the water absorption ring and enter the insulation gap outside the dehumidification zone, so that the water vapor evaporated from the water absorption ring can only be discharged from the connecting pipe at the dehumidification zone to the outside of the outer tube, which further improves the dehumidification effect and efficiency.

[0019] Preferably, one or more thermoelectric power generation sheets are arranged inside the insulation gap, and the thermoelectric power generation sheets are fixedly mounted on the inner wall of the outer tube, and the thermoelectric power generation sheets are electrically connected to the power supply. The thermoelectric power generation sheet uses the temperature difference to generate electricity. The thermoelectric power generation sheet is attached to the inner wall of the outer tube. Since the temperature is higher as it is closer to the conveying pipe, and the insulation tube is buried in the soil as a whole, that is, the outer wall of the outer tube is in contact with the soil, and the temperature of the soil is relatively low, the thermoelectric power generation sheet can form a larger temperature difference, which is more conducive to the power generation efficiency of the thermoelectric power generation sheet. The thermoelectric power generation sheet uses the residual heat emitted by the insulation tube to continuously generate electricity and store the electricity inside the power supply, so that an independent power system is formed inside the insulation tube, without the need for external power supply, thereby improving the long-term operation capability of the adsorption component of the insulation tube without external interference.

[0020] Preferably, two sealing plates are slidably mounted on the inner wall of the outer tube, the two sealing plates correspond to two connecting tubes respectively, the two sealing plates are respectively located in two dehumidification zones, and a support rod is fixed on each of the closed rings, and the two support rods are respectively connected to the sealing plates inside the dehumidification zones. The sealing plate moves together with the closed ring, and the sealing plate is used to seal the pipe mouth of the connecting tube. When the water absorption ring is not heated in the heating zone, the sealing plate seals the pipe mouth of the connecting tube, further reducing the heat dissipated by the conveying pipe to the outside of the outer tube, thereby ensuring the overall thermal insulation effect of the insulation tube. In addition, after the sealing plate seals the pipe mouth of the connecting tube, it can also ensure the sealing of the insulation tube, preventing external water vapor from entering the insulation gap through the connecting tube and affecting the thermal insulation effect of the insulation tube.

[0021] Preferably, a rubber layer is provided on the side of the sealing plate that is in contact with the inner wall of the outer tube, and an extrusion spring is provided between the sealing plate and the support rod, one end of the extrusion spring is fixedly connected to the support rod, and the other end is fixedly connected to the sealing plate, and the extrusion spring is used to keep the sealing plate pushed toward the inner wall of the outer tube. The extrusion spring keeps the sealing plate in contact with the inner wall of the outer tube, so as to avoid the sealing plate being unable to completely seal the pipe mouth of the connecting pipe due to sliding wear after long-term use, and to avoid external water vapor from entering the insulation gap from the connecting pipe to affect the insulation effect of the insulation pipe. The rubber layer further improves the sealing effect of the sealing plate on the pipe mouth of the connecting pipe.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. A polyurethane direct-buried thermal insulation pipe designed by the present invention has a dehumidification zone, a heating zone and an adsorption component arranged inside the thermal insulation pipe. After the adsorption component adsorbs water vapor in the air in the thermal insulation gap, the heating zone automatically heats the adsorption component to evaporate the water adsorbed by the adsorption component and discharge it from the connecting pipe to the outside of the thermal insulation pipe, thereby ensuring the thermal insulation effect of the thermal insulation pipe and eliminating the need for manual cleaning of the adsorption component, thereby ensuring the long-term and effective use of the adsorption component.

[0024] 2. A polyurethane direct-buried thermal insulation pipe designed by the present invention is provided with a driving motor inside. The driving motor can drive the water absorption ring of the adsorption component to reciprocate in the thermal insulation gap. The reciprocating motion of the water absorption ring can increase the contact between the water absorption ring and the air inside the thermal insulation gap, thereby further improving the water absorption efficiency of the water absorption ring on the air inside the thermal insulation gap.

[0025] 3. The polyurethane direct-buried thermal insulation pipe designed by the present invention has two heating zones and two dehumidification zones, and the heating zone and the dehumidification zone are respectively arranged at both ends of the pipe, and the barrier plate divides the water absorption ring into two layers, front and back, so that the water absorption ring can absorb air moisture in the thermal insulation gap while evaporating the water absorption ring, thereby achieving dehumidification and discharging moisture from the outside of the thermal insulation pipe, further improving the dehumidification efficiency inside the thermal insulation pipe and ensuring the thermal insulation effect of the thermal insulation pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0027] Figure 2 It is a left side view of the present invention;

[0028] Figure 3 For the present invention Figure 2 Sectional view at AA in the middle;

[0029] Figure 4 For the present invention Figure 3 The enlarged view of point B in the middle;

[0030] Figure 5 It is a schematic diagram of the state when the water absorption ring in the present invention is located in the dehumidification area far away from the driving motor;

[0031] Figure 6 It is a schematic diagram of the state when the water absorption ring in the present invention is located in the dehumidification area where the driving motor is located;

[0032] Figure 7 Schematic diagram of the three-dimensional structure of the water absorption ring in the present invention;

[0033] Figure 8 It is a top view of the water absorption ring of the present invention.

[0034] In the figure: 1. conveying pipe; 2. outer pipe; 3. insulation layer; 4. connecting rod; 5. insulation gap; 6. dehumidification area; 7. dehumidification pipe; 8. connecting pipe; 9. heating area; 10. collar; 11. water absorption ring; 12. through hole; 13. screw rod; 14. driving motor; 15. power supply; 16. humidity sensor; 17. closing ring; 18. reset spring; 19. baffle plate; 20. temperature difference power generation sheet; 21. sealing plate; 22. support rod; 23. rubber layer; 24. extrusion spring. DETAILED DESCRIPTION

[0035] See also Figures 1 to 8 The present invention provides a polyurethane direct-buried thermal insulation pipe, and the technical solution is as follows:

[0036] A polyurethane direct-buried thermal insulation pipe comprises a conveying pipe 1, an outer pipe 2 and an insulation layer 3. The outer pipe 2 is coaxially sleeved on the outside of the conveying pipe 1. Both ends of the outer pipe 2 are provided with multiple connecting rods 4. The outer pipe 2 is fixedly connected to the conveying pipe 1 by the connecting rods 4. The insulation layer 3 is coaxially coated on the outer wall of the outer pipe 2. An insulation gap 5 is left between the outer pipe 2 and the insulation layer 3.

[0037] refer to Figure 3 as well as Figures 5 to 8An annular dehumidification zone 6 is provided between the outer tube 2 and the inner tube, a dehumidification pipe 7 is fixedly installed on the outer wall of the outer tube 2, a connecting pipe 8 for connecting the dehumidification pipe 7 and the dehumidification zone 6 is provided on the outer tube 2, an adsorption component for absorbing water vapor inside the thermal insulation gap 5 is provided inside the dehumidification zone 6, the adsorption component includes a sleeve 10 coaxially sleeved on the thermal insulation layer 3, the sleeve 10 is slidably installed outside the thermal insulation layer 3, a water absorption ring 11 for absorbing water vapor is fixed on the outer ring of the sleeve 10, and the water absorption ring 11 is made of absorbent paper. A plurality of through holes 12 are provided on the sleeve 10, all of which are oriented toward the axial direction of the sleeve 10, and the plurality of through holes 12 are evenly arranged on the sleeve 10. An annular baffle plate 19 is coaxially fixedly mounted on the collar 10. The baffle plate 19 is made of aerogel. The diameter of the baffle plate 19 is the same as the inner diameter of the outer tube 2. The outer ring of the baffle plate 19 abuts against the inner wall of the outer tube 2. The baffle plate 19 is located in the middle of the collar 10. The baffle plate 19 evenly divides the water-absorbing ring 11 into two layers, front and back. A screw rod 13 is arranged inside the thermal insulation gap 5. The screw rod 13 is arranged along the axial direction of the conveying pipe 1. A driving motor 14 for driving the screw rod 13 to rotate forward or reverse is arranged inside the dehumidification zone 6. A power supply 15 for powering the driving motor 14 is also arranged inside the dehumidification zone 6. The power supply 15 can be a lithium battery or a lead-acid battery. The water absorption ring 11 is connected to the screw rod 13 through a ball screw nut. A humidity sensor 16 for detecting the humidity inside the insulation gap 5 is arranged inside the insulation gap 5. The humidity sensor 16 is electrically connected to the drive motor 14 and the power supply 15 respectively. The thermoelectric power generation sheet 20 generates electricity by using the temperature difference and stores the electricity inside the power supply 15. Two thermoelectric power generation sheets 20 are also arranged inside the insulation gap 5. The thermoelectric power generation sheets 20 are fixedly mounted on the inner wall of the outer tube 2. Both thermoelectric power generation sheets 20 are electrically connected to the power supply 15. An annular heating zone 9 not covered by the insulation layer 3 is arranged on the conveying pipe 1. The heating zone 9 is located below the collar 10 and between the collar 10 and the conveying pipe 1.

[0038] refer to Figure 3 , Figure 5 as well as Figure 6 There are two dehumidification zones 6, which are respectively arranged at the two ends of the outer tube 2, and the two dehumidification zones 6 are symmetrically arranged about the central cross section of the conveying tube 1. There are also two heating zones 9, which are symmetrically arranged in the two dehumidification zones 6 about the central cross section of the conveying tube 1. There are also two connecting pipes 8, which respectively connect the two dehumidification zones 6 with the dehumidification pipe 7. The driving motor 14 and the power supply 15 are inside one of the dehumidification zones 6.

[0039] refer to Figure 3 , Figure 4 , Figure 5 as well as Figure 6Each dehumidification zone 6 is provided with a sealing component for sealing the heating zone 9, the sealing component includes a sealing ring 17 slidably sleeved on the insulation layer 3, the sealing ring 17 is made of polyurethane foam, and the sealing ring 17 is located inside the dehumidification zone 6; a return spring 18 is also provided inside the dehumidification zone 6 along the axial direction of the delivery pipe 1, one end of the return spring 18 is fixedly connected to the connecting rod 4, and the other end is fixedly connected to the sealing ring 17; when the return spring 18 is in a natural state, the sealing ring 17 is located above the heating zone 9 and seals the heating zone 9. The two sealing components are also symmetrically arranged about the central cross section of the delivery pipe 1.

[0040] refer to Figure 3 and Figure 4 Two sealing plates 21 are slidably mounted on the inner wall of the outer tube 2, and a rubber layer 23 is provided on the side of the sealing plates 21 that is in contact with the inner wall of the outer tube 2. The two sealing plates 21 correspond to the two connecting pipes 8 respectively, and the two sealing plates 21 are respectively located in the two dehumidification zones 6. A support rod 22 is fixed on each closed ring 17, and an extrusion spring 24 is provided between the sealing plate 21 and the support rod 22. One end of the extrusion spring 24 is fixedly connected to the support rod 22, and the other end is fixedly connected to the sealing plate 21. The extrusion spring 24 is used to keep the sealing plate 21 pushed toward the inner wall of the outer tube 2. The sealing plate 21 and the support rod 22 are symmetrically arranged with respect to the central cross section of the conveying pipe 1.

[0041] Before the heat preservation pipe is connected to form a pipeline network, it is necessary to set the humidity sensor 16. The detection value of the humidity sensor 16 can be set at 35% of the air humidity.

[0042] When the insulation pipes are connected, the delivery pipes 1 on the multiple insulation pipes are welded and connected in sequence, and the outer pipes 2 of the insulation pipes are also welded and connected in sequence, and the dehumidification pipes 7 are also welded and connected in sequence. It should be noted that the port of the dehumidification pipe 7 should be set in a dry position to prevent rainwater from entering the dehumidification pipe 7. After the connection is completed, the humidity sensor 16 inside each insulation pipe will automatically detect the air humidity inside the insulation gap 5.

[0043] refer to Figure 3 In the initial state, the water absorption ring 11 is kept in the middle of the delivery pipe 1. The communication port between each communication pipe 8 and the dehumidification zone 6 is sealed by the sealing plate 21 to prevent the external humid air from entering the insulation gap 5 and to prevent the heat in the insulation gap 5 from being discharged outside the insulation gap 5. At the same time, each heating zone 9 is shielded by the sealing ring 17 to prevent the temperature of the liquid transported by the delivery pipe 1 from leaking out, thereby ensuring the insulation effect of the liquid transported by the delivery pipe 1.

[0044] refer to Figure 5When the humidity sensor 16 detects that the air humidity inside the thermal insulation gap 5 is greater than or equal to 35%, the drive motor 14 starts to rotate and drives the screw 13 to rotate. The rotation of the screw 13 drives the water absorption ring 11 to move along the axial direction of the conveying pipe 1. The water absorption ring 11 contacts the air inside the thermal insulation gap 5 and absorbs the water vapor in the air. The drive motor 14 first drives the screw 13 to rotate forward, and the screw 13 drives the water absorption ring 11 to move toward a dehumidification zone 6 away from the drive motor 14. When the water absorption ring 11 enters the dehumidification zone 6, the sleeve ring 10 pushes the closed ring 17 inside the dehumidification zone 6 to open the heating zone 9 inside the dehumidification zone 6, and the reset spring 18 is compressed; at the same time, the sealing plate 21 moves with the closed ring 17, and the pipe mouth of the connecting pipe 8 connected to the dehumidification zone 6 is also opened. When the baffle plate 19 on the water absorption ring 11 is aligned with the edge of the heating zone 9, the driving motor 14 stops for five minutes, and the side of the water absorption ring 11 facing the driving motor 14 is located outside the heating zone 9 and continues to absorb moisture from the air in the heat preservation gap 5. The part of the water absorption ring 11 that is separated from the driving motor 14 by the baffle plate 19 faces the heating zone 9, and the heat emitted by the conveying pipe 1 acts on the sleeve 10 through the heating zone 9, and the sleeve 10 transfers the heat to the part of the water absorption ring 11 facing the heating zone 9. The heating zone 9 heats the part of the water absorption ring 11 facing the heating zone 9, and the water vapor absorbed by the part of the water absorption ring 11 evaporates. Since the baffle plate 19 closes the dehumidification zone 6, the water vapor evaporated from the water absorption ring 11 cannot cross the baffle plate 19, and the evaporated water vapor can only be discharged into the dehumidification pipe 7 through the connecting pipe 8 connected to the dehumidification zone 6. In this way, the water vapor inside the insulation pipe is discharged to the outside of the insulation pipe, ensuring the dryness of the insulation layer 3 inside the insulation pipe and the insulation effect of the insulation pipe.

[0045] When the five minutes are up, refer to Figure 6, the driving motor 14 reverses and drives the water absorption ring 11 to move toward the dehumidification zone 6 in the direction of the driving motor 14. As the water absorption ring 11 leaves the dehumidification zone 6 away from the driving motor 14, the reset spring 18 is reset under the action of elastic force, and the reset spring 18 drives the closing ring 17 to close the heating zone 9 away from the driving motor 14. At the same time, the reset spring 18 also drives the sealing plate 21 to close the connecting pipe 8 away from the driving motor 14. When the water absorption ring 11 moves, the water absorption ring 11 toward the motor side contacts the air in the insulation gap 5 during the movement and absorbs moisture in the air. When the water absorption ring 11 enters the dehumidification zone 6 where the motor is located, the sleeve ring 10 pushes the closing ring 17 inside the dehumidification zone 6 to open the heating zone 9 inside the dehumidification zone 6, and the reset spring 18 is compressed; at the same time, the sealing plate 21 moves with the closing ring 17, and the pipe mouth of the connecting pipe 8 connected to the dehumidification zone 6 is also opened. When the baffle plate 19 on the water absorption ring 11 is aligned with the edge of the heating zone 9 in the dehumidification zone 6, the driving motor 14 stops for five minutes. At this time, the part of the water absorption ring 11 facing away from the driving motor 14 through the baffle plate 19 is located outside the heating zone 9 and continues to absorb moisture from the air in the thermal insulation gap 5. The water absorption ring 11 on the side of the driving motor 14 is facing the heating zone 9 and is heated by the heat emitted from the heating zone 9. After the water vapor absorbed by this part of the water absorption ring 11 is evaporated, it enters the dehumidification pipe 7 through the connecting pipe 8 connected to the dehumidification zone 6, and the water vapor is discharged from the thermal insulation gap 5 to ensure the dryness of the thermal insulation layer 3.

[0046] refer to Figure 3 , Figure 5 and Figure 6 After five minutes, the driving motor 14 drives the water absorption ring 11 to move toward the dehumidification zone 6 away from the driving motor 14, and so on, until the humidity sensor 16 detects that the air humidity inside the heat preservation gap 5 is lower than 35%, and the driving motor 14 drives the water absorption ring 11 back to the initial position, that is, the water absorption ring 11 returns to the middle of the conveying pipe 1. The two heating zones 9 are also closed by the closing ring 17 under the action of the two reset springs 18, and the two connecting pipes 8 are also closed by the sealing plate 21.

[0047] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. A polyurethane direct-buried thermal insulation pipe, comprising a delivery pipe (1), an outer pipe (2) and a thermal insulation layer (3), wherein the outer pipe (2) is coaxially sleeved outside the delivery pipe (1), a plurality of connecting rods (4) are provided at both ends of the outer pipe (2), the outer pipe (2) and the delivery pipe (1) are fixedly connected by the connecting rods (4), the thermal insulation layer (3) is coaxially coated on the outer wall of the outer pipe (2), and a thermal insulation gap (5) is left between the outer pipe (2) and the thermal insulation layer (3); characterized in that: An annular dehumidification zone (6) is provided between the outer tube (2) and the inner tube, a dehumidification pipe (7) is fixedly mounted on the outer wall of the outer tube (2), a connecting pipe (8) for connecting the dehumidification pipe (7) and the dehumidification zone (6) is provided on the outer tube (2), an adsorption component for absorbing water vapor inside the thermal insulation gap (5) is provided inside the dehumidification zone (6), and an annular heating zone (9) not covered by a thermal insulation layer (3) is provided on the conveying tube (1), the heating zone (9) is located inside the dehumidification zone (6), and the heating zone (9) is located below the adsorption component.

2. A polyurethane direct buried thermal insulation pipe according to claim 1, characterized in that: The adsorption component comprises a sleeve (10) coaxially sleeved on the thermal insulation layer (3); a water absorption ring (11) for adsorbing water vapor is fixed on the outer ring of the sleeve (10); a plurality of through holes (12) are opened on the sleeve (10); the through holes (12) are all oriented toward the axial direction of the sleeve (10); and the plurality of through holes (12) are evenly arranged on the sleeve (10).

3. A polyurethane direct buried thermal insulation pipe according to claim 2, characterized in that: The sleeve ring (10) is slidably mounted on the outside of the insulation layer (3); a screw rod (13) is arranged inside the insulation gap (5); the screw rod (13) is arranged along the axial direction of the conveying pipe (1); a driving motor (14) for driving the screw rod (13) to rotate forward or reverse is arranged inside the dehumidification zone (6); a power supply (15) for supplying power to the driving motor (14) is also arranged inside the dehumidification zone (6); the water absorption ring (11) is connected to the screw rod (13) through a ball screw nut; a humidity sensor (16) for detecting the humidity inside the insulation gap (5) is arranged inside the insulation gap (5); the humidity sensor (16) is electrically connected to the driving motor (14) and the power supply (15), respectively.

4. A polyurethane direct buried thermal insulation pipe according to claim 3, characterized in that: A sealing component for sealing the heating zone (9) is also provided in the dehumidification zone (6), the sealing component comprising a sealing ring (17) slidably sleeved on the thermal insulation layer (3), the sealing ring (17) being made of polyurethane foam and being located inside the dehumidification zone (6); a return spring (18) is also provided inside the dehumidification zone (6) along the axial direction of the conveying pipe (1), one end of the return spring (18) being fixedly connected to the connecting rod (4) and the other end being fixedly connected to the sealing ring (17); when the return spring (18) is in a natural state, the sealing ring (17) is located above the heating zone (9) and seals the heating zone (9).

5. The polyurethane direct-buried thermal insulation pipe according to claim 4, characterized in that: There are two dehumidification zones (6), which are respectively arranged at the two ends of the outer tube (2), and the two dehumidification zones (6) are symmetrically arranged with respect to the central cross section of the conveying tube (1). There are also two heating zones (9), which are respectively located in the two dehumidification zones (6); there are also two connecting pipes (8), which respectively connect the two dehumidification zones (6) with the dehumidification pipe (7). A sealing component is arranged inside each dehumidification zone (6), and the two sealing components are symmetrically arranged with respect to the central cross section of the conveying tube (1). An annular baffle plate (19) is coaxially fixedly mounted on the sleeve ring (10), and the outer ring of the baffle plate (19) abuts against the inner wall of the outer tube (2). The baffle plate (19) is located in the middle of the sleeve ring (10), and the baffle plate (19) evenly divides the water absorption ring (11) into two layers, front and back.

6. The polyurethane direct-buried thermal insulation pipe according to claim 3, characterized in that: One or more thermoelectric power generation sheets (20) are arranged inside the heat-insulating gap (5). The thermoelectric power generation sheets (20) are fixedly mounted on the inner wall of the outer tube (2). The one or more thermoelectric power generation sheets (20) are electrically connected to a power source (15).

7. The polyurethane direct-buried thermal insulation pipe according to claim 5, characterized in that: Two sealing plates (21) are slidably mounted on the inner wall of the outer tube (2), the two sealing plates (21) respectively corresponding to the two connecting tubes (8), the two sealing plates (21) respectively located in the two dehumidification zones (6), each of the closed rings (17) is fixed with a support rod (22), and the two support rods (22) are respectively connected to the sealing plates (21) inside the dehumidification zones (6) where they are located.

8. The polyurethane direct-buried thermal insulation pipe according to claim 7, characterized in that: A rubber layer (23) is provided on the surface of the sealing plate (21) that contacts the inner wall of the outer tube (2), and a compression spring (24) is provided between the sealing plate (21) and the support rod (22). One end of the compression spring (24) is fixedly connected to the support rod (22), and the other end is fixedly connected to the sealing plate (21). The compression spring (24) is used to keep the sealing plate (21) pushed toward the inner wall of the outer tube (2).

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