Anti-cracking corrugated pipe for outdoor use

Abstract

The application discloses an anti-cracking corrugated pipe for outdoor use and relates to the technical field of corrugated pipes. The anti-cracking corrugated pipe comprises an outer pipe, a phase-change inner lining and a support flow guide assembly. The phase-change inner lining is arranged in the inner part of the outer pipe in a matched mode. When the outer pipe is bent due to shaking, the phase-change inner lining is bent along with the outer pipe. When the ambient temperature reaches the phase-change temperature of the phase-change inner lining, the phase-change inner lining drives the outer pipe to recover. The support flow guide assembly is arranged in the inner part of the phase-change inner lining and is matched with the inner wall of the phase-change inner lining. When vibrating, the support flow guide assembly can play a supporting role in the inner part of the outer pipe, reduces the vibration amplitude of the outer pipe, can disturb the airflow between the outer pipe and the cable, can absorb the heat around the cable by using the phase-change energy storage medium, can avoid frequent thermal expansion and cold contraction caused by the temperature difference between the inner part and the outer part of the outer pipe and the vibration of the outer pipe, and can further avoid the fatigue cracking and damage of the outer pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of corrugated pipes, in particular to an anti-cracking corrugated pipe for outdoor use. BACKGROUND

[0002] A corrugated pipe is a flexible pipe material with a corrugated wall, usually made of plastic or metal, used for supporting pipes, cables or casings. Its structural feature is that the entire pipe body is regularly corrugated, which enables it to be bendable, stretchable and twistable, while maintaining a certain sealing and pressure resistance.

[0003] As a typical outdoor energy facility, photovoltaic power stations need reliable protection. Corrugated pipes, as flexible pipes made of rigid materials, can effectively protect cables. However, due to the long-term exposure of corrugated pipes to high temperatures, the continuous action of high-intensity ultraviolet rays on the surface of the corrugated pipe will accelerate the aging of the corrugated pipe, resulting in cracking and damage, which affects its protection of the cable. In view of the above problems, the existing technology has a good solution, which replaces the plastic corrugated pipe with a metal corrugated pipe and performs galvanizing, polishing or plastic coating on the surface of the metal corrugated pipe to avoid the influence of direct sunlight, thereby avoiding the cracking and damage of the metal corrugated pipe. However, there are still the following defects: In the flat single-axis tracking photovoltaic power station in a coastal city with strong winds, in order to improve the power generation efficiency, the angle of the photovoltaic panel is constantly adjusted to track the angle of the sun. However, under the action of strong wind, the torsional stiffness of the support structure is low, which easily induces continuous wind-induced torsional vibration, and even forms a stable "limit cycle" vibration state, and the amplitude continuously exists with the change of wind speed, which causes the corrugated pipe to also be in a state of continuous vibration. Combined with the sharp rise in temperature under sunlight and the decrease in temperature at night or on rainy days, the large temperature difference will cause the corrugated pipe to frequently expand and contract, and this cyclic stress concentrates at the peak and valley when the corrugated pipe is bent, which easily causes the corrugated pipe to fatigue and crack, thereby affecting the protection of the cable. SUMMARY

[0004] In view of the problems existing in the prior art, the present application is proposed.

[0005] Therefore, the purpose of the present application is to provide an anti-cracking corrugated pipe for outdoor use, which solves the problem that in the flat single-axis tracking photovoltaic power station in a coastal city with strong winds, frequent bending and thermal expansion and contraction easily cause the corrugated pipe to fatigue and crack, thereby affecting the protection effect of the corrugated pipe on the cable.

[0006] In order to achieve the above object, the present application provides the following technical scheme: an anti-cracking corrugated pipe for outdoor use, comprising an outer pipe, a phase change inner liner and a support flow guide assembly, the phase change inner liner is arranged in the inner part of the outer pipe, the phase change inner liner bends along with the outer pipe when the outer pipe shakes and bends, the outer pipe restores when the environmental temperature reaches the phase change temperature of the phase change inner liner, the support flow guide assembly is arranged in the inner part of the phase change inner liner and is attached to the inner wall of the phase change inner liner, the support flow guide assembly reversely blocks in the inner part of the phase change inner liner when the phase change inner liner bends along with the outer pipe, and the support flow guide assembly continuously sucks the airflow in the inner part of the outer pipe when the bending force of the outer pipe is greater than the resistance of the support flow guide assembly.

[0007] As a preferred scheme of the anti-cracking corrugated pipe for outdoor use, the support flow guide assembly comprises a framework, a one-way valve one and a one-way valve two, the framework is a viscoelastic damping frame and is arranged in the phase change inner liner, the framework is spiral and hollow inside, the one-way valve one and the one-way valve two are arranged at both ends of the framework and are connected to the inside of the framework, and the both ends of the outer pipe are provided with annular plates to facilitate the fixation of the both ends of the outer pipe and the framework.

[0008] As a preferred scheme of the anti-cracking corrugated pipe for outdoor use, the surface of the framework is covered with an anti-collision strip, and the anti-collision strip is arranged in a porous manner.

[0009] As a preferred scheme of the anti-cracking corrugated pipe for outdoor use, the one-way valve one is an air inlet valve, the one-way valve two is an air outlet valve, and the one-way valve one is arranged above the one-way valve two.

[0010] As a preferred scheme of the anti-cracking corrugated pipe for outdoor use, the inner part of the outer pipe is provided with a sandwich layer, and the inner part of the sandwich layer is filled with a phase change energy storage medium.

[0011] As a preferred scheme of the anti-cracking corrugated pipe for outdoor use, the outer wall of the outer pipe is uniformly coated with a protective coating.

[0012] As a preferred scheme of the anti-cracking corrugated pipe for outdoor use, the one-way valve one comprises a valve body and a conduit, one end of the conduit is connected to the valve body and the central axes of the two are perpendicular to each other, one end of the conduit penetrates into the inside of the framework and is rotationally connected to the framework, and the center of gravity of the valve body is located at the end away from the air outlet.

[0013] As a preferred scheme of the anti-cracking corrugated pipe for outdoor use, the phase change inner liner is jointly woven by fibers and memory alloy wires, the memory alloy wires are concentratedly distributed at the wave crests of the outer pipe, and the phase change temperature of the memory alloy wires is greater than or equal to the phase change temperature of the phase change energy storage medium in the sandwich layer.

[0014] In summary, the present application comprises at least one of the following beneficial effects:

[0015] 1、The present application, by setting the support flow component, not only can play a supporting role in the inside of the outer tube, avoid the outer tube frequently bending in the vibration environment, but also can slow down the bending speed of the outer tube when the outer tube cannot overcome the vibration and bend, avoid the outer tube frequently and quickly bending, that is, effectively avoid the problem of cracking of the outer tube surface due to frequent stress concentration, realize the effective protection of the cable.

[0016] 2、The present application, by setting the support flow component and the phase change energy storage medium, can utilize the one-way conduction of the one-way valve and the one-way valve to make the skeleton realize the continuous flow of air in the process of vibration and expansion, avoid the heat generated during the operation of the cable from gathering around the cable, and at the same time, utilize the phase change energy storage medium to absorb heat when dispersing heat, avoid the stress concentration at the peak and valley of the outer tube bending caused by frequent thermal expansion and cold contraction at night or in rainy days when the temperature is low in the strong wind environment, thereby effectively avoiding the fatigue cracking damage of the outer tube surface, and further being able to effectively protect the cable while ensuring the sealing effect of the outer tube.

[0017] 3、The present application, by setting the phase change lining and the phase change energy storage material, can completely melt the phase change energy storage material when the temperature rises to the phase change temperature of the phase change energy storage material, and after completely melting, continue to heat to the phase change temperature of the phase change lining, so that the memory alloy wire in the phase change lining resets, realizes further support to the inside of the outer tube, avoids frequent bending of the outer tube in high temperature environment, further avoids the problem of fatigue cracking damage of the outer tube surface due to frequent bending, and further realizes effective protection of the cable. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments or prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0019] Figure 1 is a schematic view of the three-dimensional structure of the present application;

[0020] Figure 2 is a schematic view of the three-dimensional structure of the present application; Figure 1 is a schematic view of the three-dimensional structure of the present application;

[0021] Figure 3 is a schematic view of the three-dimensional structure of the support flow component of the present application;

[0022] Figure 4 A part of the application is shown in the following drawings: Figure 2 A part of the application is shown in the following drawings:

[0023] Figure 5 A part of the application is shown in the following drawings:

[0024] Figure 6 A part of the application is shown in the following drawings: Figure 1 A part of the application is shown in the following drawings:

[0025] Figure 7 A part of the application is shown in the following drawings: Figure 3 A part of the application is shown in the following drawings:

[0026] Figure 8 A part of the application is shown in the following drawings: Figure 6 A part of the application is shown in the following drawings.

[0027] Explanation of reference signs:

[0028] 1, outer tube; 11, annular plate; 12, interlayer; 2, phase change inner liner; 21, fiber; 22, memory alloy wire; 3, support flow guide assembly; 31, framework; 311, anti-collision strip; 32, one-way valve I; 321, valve body; 322, catheter; 33, one-way valve II. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the application will be apparently and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0030] The embodiments of the application disclose an outdoor anti-cracking corrugated pipe.

[0031] Embodiment 1: refer to Figures 1-6For the first embodiment of the present application, an anti-cracking corrugated pipe for outdoor use is provided, which comprises an outer pipe 1, which is a plastic corrugated pipe, to accommodate the sway of the support structure of the photovoltaic panel when tracking the angle of the sun in the gale environment of the coastal city, thereby protecting the cable inside, and a phase change lining 2 and a support flow guide assembly 3, the phase change lining 2 is arranged inside the outer pipe 1, when the outer pipe 1 bends due to sway, the phase change lining 2 bends with the outer pipe 1, when the ambient temperature reaches the phase change temperature of the phase change lining 2, the phase change lining 2 drives the outer pipe 1 to recover, the support flow guide assembly 3 is arranged inside the phase change lining 2 and is attached to the inner wall of the phase change lining 2, when the phase change lining 2 bends with the outer pipe 1, the support flow guide assembly 3 resists inside the phase change lining 2, avoiding the outer pipe 1 from easily bending and deforming due to vibration, when the bending force of the outer pipe 1 is greater than the resistance of the support flow guide assembly 3, the support flow guide assembly 3 continuously sucks the airflow inside the outer pipe 1, thereby increasing the flow speed of the airflow inside the outer pipe 1, avoiding the cable inside the outer pipe 1 from being wrapped by heat, and achieving effective protection of the cable.

[0032] The support flow guide assembly 3 comprises a framework 31, a one-way valve one 32 and a one-way valve two 33, the framework 31 is a viscoelastic damping bracket and is arranged in the phase change lining 2 (the framework 31 can be injection molded by damping polyurethane material to consider the support strength and vibration energy absorption effect), the framework 31 is spiral and hollow inside, which can extrude the phase change lining 2 from the inside to further support the inner wall of the outer pipe 1, and provide damping energy dissipation function. When vibration, a high-speed and repeated deformation occurs, friction and slip will occur between the molecular chains inside the framework 31, which will convert mechanical energy into heat energy dissipation, thereby inhibiting vibration, reducing the vibration amplitude of the outer pipe 1, avoiding the outer pipe 1 from being bent greatly, and further avoiding the cyclic stress caused by frequent vibration from being concentrated at the peak and valley formed when the outer pipe 1 is bent greatly, effectively preventing the outer pipe 1 from being damaged by fatigue cracking, the one-way valve one 32 and the one-way valve two 33 are arranged at both ends of the framework 31 and are connected to the inside of the framework 31, both ends of the outer pipe 1 are provided with annular plates 11 to facilitate the fixation of both ends of the outer pipe 1 and the framework 31, during the vibration of the framework 31 along the center line of the outer pipe 1 or the continuous swinging of the framework 31 along the radial direction of the outer pipe 1, the one-way valve one 32 and the one-way valve two 33 can realize the exchange of airflow at both ends of the outer pipe 1 by one-way conduction, making the airflow inside the outer pipe 1 flow continuously, and further avoiding heat from gathering on the surface of the cable inside the inner pipe.

[0033] The surface of the skeleton 31 is covered with anti-collision strips 311, which are arranged in a porous manner. The anti-collision strips 311 can protect the cables inside the outer pipe 1 when the outer pipe 1 vibrates due to the photovoltaic panel tracking the angle of the sun, thereby avoiding wear and tear of the cables due to friction with the inner wall of the outer pipe 1. The porous arrangement of the anti-collision strips 311 can also disrupt the flow path of the air inside the outer pipe 1, further preventing heat from being trapped on the surface of the cables.

[0034] The one-way valve one 32 is an air inlet valve, and the one-way valve two 33 is an air outlet valve. The one-way valve one 32 is arranged above the one-way valve two 33. As the density of air decreases when it heats up, more heat inside the outer pipe 1 tends to accumulate at the top. When the skeleton 31 swings or vibrates, the one-way valve one 32 and the one-way valve two 33 open and close alternately, allowing the one-way valve one 32 to suck the air accumulated at the top and with a higher temperature into the interior of the skeleton 31. As the amount of air inside the skeleton 31 gradually increases, the air inside will gradually be re-pressed into the interior of the outer pipe 1 through the one-way valve two 33, thereby forming a pumping effect and accelerating the air flow rate between the outer pipe 1 and the skeleton 31. This ensures the sealing effect of the outer pipe 1 while achieving continuous air flow inside the outer pipe 1, allowing heat to be conducted to the outer pipe 1 and thereby dissipating heat.

[0035] The inner part of the outer pipe 1 is provided with a sandwich layer 12, which is filled with a phase change energy storage medium. The more commonly used and better performing cable material in outdoor applications such as photovoltaic power stations is cross-linked polyethylene, which has a long-term allowable operating temperature of typically 90°C. Therefore, the phase change temperature of the phase change energy storage medium is set to 65-75°C (the phase change energy storage medium can use microcapsule-encapsulated industrial paraffin with a melting point of 70°C and a phase change latent heat of not less than 180 kJ / kg). In coastal cities, the surface temperature of the ground or equipment under the sun in summer can reach 60-70°C. This means that the outer pipe 1 itself will be heated to a very high temperature, and the phase change point of the phase change energy storage material must be higher than this purely environmental "base temperature", otherwise the cable will be heated to the phase change state by the environment before it starts to absorb heat from the cable, which means that the cable cannot absorb the heat dissipated by the cable, causing the cable to be damaged by the superimposed temperature inside and outside the outer pipe 1.

[0036] The outer wall of the outer pipe 1 is uniformly coated with a protective coating, which is a spectrally selective coating that can reflect sunlight and prevent the transmission of ultraviolet light to the interior of the outer pipe 1, and can also prevent the erosion of smog in coastal cities, effectively preventing cracks on the surface of the outer pipe 1 that affect the protective effect of the cables.

[0037] The one-way valve 32 comprises a valve body 321 and a conduit 322, one end of the conduit 322 is connected with the valve body 321 and the central axes of the two are perpendicular to each other, one end of the conduit 322 penetrates into the inside of the framework 31 and is rotationally connected with the framework 31, and the center of gravity of the valve body 321 is located at the end far away from the air outlet of the valve body 321; since the upper end of the outer tube 1 is not always in a vertical state during installation and after installation, by setting the center of gravity of the valve body 321 at the end far away from the air outlet of the valve body 321, the valve body 321 can always keep the air outlet in a vertical upward state under the action of gravity, so that the heat gathered above the outer tube 1 can be better sucked into the inside of the framework 31 during the vibration or shaking of the framework 31, and further avoid the heat in the inside of the outer tube 1 from gathering around the cable.

[0038] The phase change lining 2 is jointly woven by the fibers 21 and the memory alloy wires 22, and the memory alloy wires 22 are concentratedly distributed at the wave crests of the outer tube 1, and the phase change temperature of the memory alloy wires 22 is greater than or equal to the phase change temperature of the phase change energy storage medium in the interlayer 12, when the ambient temperature rises to the phase change temperature of the memory alloy wires 22, the phase change energy storage medium has already absorbed heat and melted, at this time, the memory alloy wires 22 will have a tendency to restore the original state, and in the process of restoring the original state, the memory alloy wires 22 extrude the tube wall of the outer tube 1 from the inside of the outer tube 1, assist the outer tube 1 to restore the original state, and inhibit the over-bending of the outer tube 1, so as to avoid the stress from gathering at the bending positions due to the frequent bending of the outer tube 1 in the high-temperature environment, avoid the cracking of the tube wall of the outer tube 1 due to the frequent generation of stress, and further protect the cable.

[0039] When the frequent vibration causes the outer tube 1 to vibrate, the framework 31 provides support in the inside of the phase change lining 2 to avoid the bending of the outer tube 1 in the case of small vibration, when the vibration causes the outer tube 1 to bend by overcoming the resistance of the framework 31, the viscoelastic effect of the framework 31 can absorb the vibration, so that the outer tube 1 cannot bend quickly and rebound, the frequency of the bending of the outer tube 1 is reduced, the surface cracking of the outer tube 1 due to the frequent stress concentration is avoided, and the cable is effectively protected;

[0040] When the outer tube 1 vibrates, the framework 31 in the inside of the outer tube 1 will appear the phenomenon of expansion and contraction, when the framework 31 expands and contracts, the one-way conduction of the one-way valve 32 and the one-way valve 33 can continuously disturb the airflow, which guarantees the sealing effect of the outer tube 1 and avoids the heat generated during the operation of the cable from gathering on the surface of the cable, and with the continuous flow of the airflow, the heat in the airflow will also continuously flow with the airflow, in this process, the phase change energy storage medium arranged in the inside of the outer tube 1 absorbs heat, and when the temperature reaches the phase change temperature, the phase change energy storage material completely melts, which realizes the effective absorption of heat and further avoids the heat from gathering on the surface of the cable;

[0041] When the temperature decreases at night or on a rainy day, the heat absorbed by the phase change energy storage medium is released to the surrounding environment, avoiding frequent thermal expansion and contraction of the surface of the outer tube 1 due to environmental temperature difference, i.e. avoiding the concentration of cyclic stress at the peak and valley of the outer tube 1 when it is bent, and further avoiding fatigue cracking damage of the surface of the outer tube 1.

[0042] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the spirit and scope of the present application, and all modifications and equivalent replacements should be covered in the scope of the claims of the present application.

Claims

1. A crack-resistant corrugated pipe for outdoor use, comprising an outer pipe (1), characterized in that: It also includes a phase change liner (2) and a support and flow guide assembly (3). The phase change liner (2) is fitted inside the outer tube (1). When the outer tube (1) shakes and bends, the phase change liner (2) bends along with the outer tube (1). When the ambient temperature reaches the phase change temperature of the phase change liner (2), the phase change liner (2) drives the outer tube (1) to recover. The support and flow guide assembly (3) is inserted inside the phase change liner (2) and fits against the inner wall of the phase change liner (2). When the phase change liner (2) bends along with the outer tube (1), the support and flow guide assembly (3) provides reverse obstruction inside the phase change liner (2). When the bending force of the outer tube (1) is greater than the resistance of the support and flow guide assembly (3), the support and flow guide assembly (3) continuously draws airflow inside the outer tube (1). The supporting flow guiding assembly (3) includes a frame (31), a one-way valve (32) and a one-way valve (33). The frame (31) is a viscoelastic damping frame and is set in the phase change liner (2). The frame (31) is spiral and hollow inside. The one-way valve (32) and the one-way valve (33) are respectively set at both ends of the frame (31) and are connected to the inside of the frame (31). Both ends of the outer tube (1) are provided with annular plates (11) to facilitate fixing the outer tube (1) and both ends of the frame (31).

2. The crack-resistant corrugated pipe for outdoor use according to claim 1, characterized in that, The surface of the frame (31) is covered with anti-collision strips (311), which are arranged in a porous manner.

3. The crack-resistant corrugated pipe for outdoor use according to claim 1, characterized in that, The first one-way valve (32) is an intake valve, and the second one-way valve (33) is an exhaust valve. The first one-way valve (32) is located above the second one-way valve (33).

4. The crack-resistant corrugated pipe for outdoor use according to claim 1, characterized in that, The outer tube (1) has an inner layer (12) and the inner layer (12) is filled with a phase change energy storage medium.

5. The crack-resistant corrugated pipe for outdoor use according to claim 1, characterized in that, The outer wall of the outer tube (1) is uniformly coated with a protective coating.

6. The crack-resistant corrugated pipe for outdoor use according to claim 1, characterized in that, The one-way valve (32) includes a valve body (321) and a conduit (322). One end of the conduit (322) is connected to the valve body (321) and the central axes of the two are perpendicular to each other. One end of the conduit (322) extends into the interior of the frame (31) and is rotatably connected to the frame (31). The center of gravity of the valve body (321) is located at the end away from its own air outlet.

7. The crack-resistant corrugated pipe for outdoor use according to claim 4, characterized in that, The phase change liner (2) is woven from fibers (21) and shape memory alloy wires (22), and the shape memory alloy wires (22) are concentrated at the crests of the outer tube (1). The phase change temperature of the shape memory alloy wires (22) is greater than or equal to the phase change temperature of the phase change energy storage medium in the interlayer (12).

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