Anti-freezing and anti-cracking fire-fighting pipeline structure suitable for low-temperature environment

Abstract

The utility model discloses an anti-freezing and anti-cracking fire-fighting pipeline structure suitable for a low-temperature environment, relates to the technical field of pipelines, and aims to solve the technical problem that an existing fire-fighting pipeline is poor in anti-freezing and anti-cracking effect. An anti-freezing anti-cracking fire-fighting pipeline structure suitable for a low-temperature environment comprises an outer pipe layer, a heat preservation layer and an inner pipe layer, the inner pipe layer is located in the outer pipe layer, the heat preservation layer is located between the outer pipe layer and the inner pipe layer, a rubber pipe layer is arranged on the inner wall of the inner pipe layer, and a plurality of sets of grooves are formed in the inner wall of the rubber pipe layer at equal intervals; a plurality of groups of buffer cavities are formed in the wall layer of the rubber pipe layer at equal intervals; a rubber reinforcing strip is arranged in the buffer cavity and comprises a rubber outer ring, and an inner cavity of the rubber outer ring is of a hexagonal honeycomb structure. The anti-freezing anti-cracking fire-fighting pipeline structure suitable for the low-temperature environment is used for conveying tap water.

Description

A freeze-resistant and crack-resistant fire-fighting pipeline structure suitable for low-temperature environments Technical Field

[0001] This utility model relates to the field of pipeline technology, and more specifically, to a frost-resistant and crack-resistant fire-fighting pipeline structure suitable for low-temperature environments. Background Technology

[0002] In cold, low-temperature environments, the liquid inside fire-fighting pipes used to transport tap water is prone to freezing due to low temperatures. Once frozen, the water expands in volume by approximately 9%, creating significant expansion stress on the pipes and potentially causing them to crack. To address this, external insulation layers are typically wrapped around the pipes, antifreeze is added, or electric heating tape is used to insulate the water inside or lower its freezing point, preventing the water from freezing and causing the pipes to crack.

[0003] (1) Although wrapping the external insulation layer for antifreeze is simple to operate and cheap, the antifreeze effect is poor. When the outside temperature is too low, or the external insulation layer is aged or damaged, the liquid water in the pipe will still freeze, causing the pipe to crack.

[0004] (2) Adding antifreeze to lower the freezing point of liquid water is simple to operate, but the antifreeze effect is generally poor, and when fire pipes are directly connected to municipal pipes, they are prone to contaminating municipal tap water.

[0005] (3) Although electric heat tracing has a good antifreeze effect, electric heat tracing equipment is expensive and energy-intensive. When the power is cut off or the electric heat tracing equipment malfunctions, the liquid water in the pipeline will still freeze and cause the pipeline to crack.

[0006] In view of this, we propose a frost-resistant and crack-resistant fire-fighting pipeline structure suitable for low-temperature environments. Summary of the Invention

[0007] The purpose of this utility model is to overcome the shortcomings of the existing technology, adapt to the needs of reality, and provide a frost-resistant and crack-resistant fire-fighting pipeline structure suitable for low-temperature environments, so as to solve the technical problem of poor frost-resistant and crack-resistant effect of current pipelines.

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a frost-resistant and crack-resistant fire-fighting pipeline structure suitable for low-temperature environments, comprising an outer pipe layer, an insulation layer and an inner pipe layer, wherein the inner pipe layer is located inside the outer pipe layer and the insulation layer is located between the outer pipe layer and the inner pipe layer, a rubber pipe layer is arranged on the inner wall of the inner pipe layer, and a number of grooves are equidistantly formed on the inner wall of the rubber pipe layer, and a number of buffer cavities are equidistantly formed on the wall of the rubber pipe layer;

[0009] A rubber reinforcing strip is arranged inside the buffer cavity. The rubber reinforcing strip includes a rubber outer ring, and the inner cavity of the rubber outer ring has a hexagonal honeycomb structure.

[0010] Preferably, the groove is semi-circular, and the depth of the groove is half that of the rubber tube layer.

[0011] Preferably, rubber sealing rings are arranged at both ends of the rubber tube layer, and the rubber sealing rings are arranged with protrusions corresponding to the buffer cavity on the side facing the rubber tube layer.

[0012] Preferably, the rubber tube layer, the rubber reinforcing strip, and the rubber sealing ring are all hydrogenated nitrile rubber.

[0013] Preferably, the rubber tube layer includes an outer layer and an inner layer, the inner layer is located inside the outer layer, and a number of connecting strips are arranged at equal intervals between the outer layer and the inner layer.

[0014] Preferably, the outer layer has a Shore hardness of 75-80, and the inner layer has a Shore hardness of 60-65.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model incorporates a rubber tube layer on the inner wall of the inner pipe layer, with several sets of grooves evenly spaced on the inner wall of the rubber tube layer, and several sets of buffer cavities evenly spaced within the wall of the rubber tube layer. Therefore, in low-temperature environments, when the water source in the pipeline freezes and expands, it will displace the water source in the grooves outwards. Then, ice will first fill the grooves to accommodate a portion of the water source's freezing and expansion. The remaining expansion stress will act on the rubber tube layer, which, with the assistance of the buffer cavities, can undergo effective elastic deformation to absorb the remaining expansion stress. Ultimately, very little stress is transmitted to the inner pipe layer, thus greatly improving the effectiveness of freezing and crack prevention for water supply pipelines in low-temperature environments. This solves the technical problem of poor freezing and crack prevention in current pipelines, and therefore, this utility model has a better freezing and crack prevention effect.

[0017] 2. This utility model also arranges rubber reinforcing strips in the buffer cavity. The inner cavity of the rubber outer ring of the rubber reinforcing strip has a hexagonal honeycomb structure, thereby forming regularly arranged elastic buffer units in the buffer cavity. When the tap water inside freezes and expands, the hexagonal honeycomb structure of the rubber outer ring undergoes elastic deformation, which can better absorb the expansion stress. Moreover, under the action of water flow pressure, the walls of each regularly arranged honeycomb hole will support each other, dispersing the pressure brought by the water flow. This allows the rubber tube layer to be evenly stressed as a whole, avoiding excessive local compression. The hole walls will undergo slight elastic deformation to absorb the pressure, just like a spring. Within a certain range, it can maintain a stable elastic buffering capacity and will not be easily compressed to the limit by the water flow. This ensures that the rubber tube layer can effectively buffer the impact of water flow during normal use, without being squeezed by the water flow to the point of losing its buffering effect, further ensuring the effectiveness of the rubber tube layer in mitigating the stress of water freezing and expansion. Attached Figure Description

[0018] Figure 1 is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 is a schematic diagram of the first structure of the rubber tube layer of this utility model;

[0020] Figure 3 is a schematic diagram of the second structure of the rubber tube layer of this utility model;

[0021] Figure 4 is a schematic diagram of the rubber sealing ring structure of this utility model;

[0022] Figure 5 is a schematic diagram of the rubber reinforcing strip structure of this utility model.

[0023] Explanation of the labels in the diagram:

[0024] 1. Outer tube layer; 2. Insulation layer; 3. Inner tube layer; 4. Rubber tube layer; 401. Outer layer; 402. Inner layer; 403. Connecting strip; 5. Groove; 6. Buffer cavity; 7. Rubber reinforcing strip; 701. Rubber outer ring; 702. Hexagonal honeycomb structure; 8. Rubber sealing ring; 801. Protrusion. Detailed Implementation

[0025] As shown in Figures 1 to 5, this utility model relates to a frost-resistant and crack-resistant fire-fighting pipeline structure suitable for low-temperature environments, comprising an outer pipe layer 1, an insulation layer 2, and an inner pipe layer 3. The inner pipe layer 3 is located inside the outer pipe layer 1, and the insulation layer 2 is located between the outer pipe layer 1 and the inner pipe layer 3. A rubber pipe layer 4 is arranged on the inner wall of the inner pipe layer 3. Several sets of grooves 5 are equidistantly formed on the inner wall of the rubber pipe layer 4, and several sets of buffer cavities 6 are equidistantly formed on the wall of the rubber pipe layer 4. The rubber pipe layer 4 includes an outer layer 401 and an inner layer 402. The inner layer 402 is located inside the outer layer 401, and several sets of connecting strips 403 are equidistantly arranged between the outer layer 401 and the inner layer 402.

[0026] The insulation layer 2 in the pipeline can insulate the water source inside the pipeline and prevent freezing, thus protecting the pipeline from freezing and cracking. Under normal circumstances, the water is in a flowing state. When it flows through the groove 5, although there is water in the groove 5, the water flow is fluid. When the local pressure changes, the water flow will quickly adjust. If the water source inside the pipeline freezes and expands in a low-temperature environment, the pressure generated by the volume expansion is static and continuously increasing. At this time, the pressure generated by freezing will first squeeze out the water that was originally flowing in the groove 5, thereby making room for the expansion of the ice and achieving the expansion effect of the frozen water. This accommodates a portion of the water source freezing and expansion. The remaining expansion stress will act on the rubber tube layer 4. With the cooperation of the buffer cavity 6, the rubber tube layer 4 can undergo effective elastic deformation, thereby absorbing the remaining expansion stress. Finally, very little stress is left to be transmitted to the inner tube layer 3, thus greatly achieving effective protection against freezing and cracking of the pipeline that transports tap water in a low-temperature environment.

[0027] Specifically, the groove 5 is semi-circular, and the depth of the groove 5 is half that of the rubber tube layer 4. The half-depth groove 5 can provide effective expansion space for the water source to freeze and expand. Moreover, the semi-circular groove 5 has no sharp corners. When subjected to the pressure generated by the expansion of the water source due to freezing, the stress can be evenly distributed along the arc surface of the groove 5, avoiding stress concentration in the corners. Furthermore, the arc structure of the semi-circular groove 5 makes the water flow smoother, reducing water flow resistance and turbulence.

[0028] Furthermore, rubber sealing rings 8 are arranged at both ends of the rubber tube layer 4, and protrusions 801 corresponding to the buffer cavity 6 are arranged on the side of the rubber sealing rings 8 facing the rubber tube layer 4. The protrusions 801 of the rubber sealing rings 8 are inserted into the buffer cavity 6, and the rubber sealing rings 8 are bonded to both ends of the rubber tube layer 4, sealing both ends of the groove 5. When the water flows in the pipe, it tends to pass through the main channel quickly. The water flow in the groove 5 is in a relatively stable "stagnant" state. When the water source freezes and expands, the pressure at the freezing point increases sharply, which is much greater than the normal water flow pressure in the pipe. Under this huge pressure difference, the water in the groove 5 will be squeezed out quickly, so that the groove 5 can effectively accommodate the expansion volume of the ice. Moreover, the semi-circular groove 5 reduces the resistance of the water flow. The smaller water flow resistance also helps to reduce the stagnation of the water flow in the groove 5. When the water source freezes, it is more conducive to the water in the groove 5 being discharged, making room for the expansion of the ice.

[0029] Furthermore, the rubber pipe layer 4, the rubber reinforcing strip 7, and the rubber sealing ring 8 are all made of hydrogenated nitrile butadiene rubber. Hydrogenated nitrile butadiene rubber is a low-temperature resistant elastic rubber with a high elastic modulus and good resilience. Under normal water flow pressure, although the water flow will exert a certain pressure on the rubber pipe layer 4, the elasticity of the rubber material itself will cause it to deform moderately and will not be squeezed to its maximum state. In general, in the fire protection pipelines of oil and gas long-distance pipeline stations or urban water supply networks, the normal water pressure is usually between 0.3-0.6 MPa. This pressure is far less than the elastic limit of the rubber layer. The rubber layer can quickly return to its original shape after bearing the water flow pressure, ensuring the continuous effectiveness of its buffering function.

[0030] It is worth noting that the outer layer 401 has a Shore hardness of 75-80, while the inner layer 402 has a Shore hardness of 60-65. The outer layer 401 with a Shore hardness of 75-80 provides excellent support, while the inner layer 402 with a Shore hardness of 60-65 improves elastic buffering performance. Through this gradient change, the stress distribution of the rubber tube layer 4 is more uniform when subjected to water flow impact and ice expansion stress, effectively improving the fatigue life of the rubber layer and extending the overall service life of the pipeline.

[0031] In an embodiment of this utility model, a rubber reinforcing strip 7 is arranged inside the buffer cavity 6. The rubber reinforcing strip 7 includes a rubber outer ring 701, and the inner cavity of the rubber outer ring 701 is a hexagonal honeycomb structure 702.

[0032] The hexagonal honeycomb structure 702 forms regularly arranged elastic buffer units within the buffer cavity 6. When the tap water inside freezes and expands, the hexagonal honeycomb structure 702 of the rubber outer ring 701 undergoes elastic deformation, which can better absorb the expansion stress. Moreover, under the action of water flow pressure, the regularly arranged honeycomb holes support each other, dispersing the pressure brought by the water flow. This allows the rubber tube layer 4 to be evenly stressed, avoiding excessive local compression. The hole walls undergo slight elastic deformation to absorb pressure, just like a spring. Within a certain range, it can maintain a stable elastic buffering capacity and will not be easily compressed to the limit by the water flow. This ensures that the rubber tube layer 4 can effectively buffer the impact of water flow during normal use without being squeezed by the water flow to the point of losing its buffering effect, further ensuring the effectiveness of the rubber tube layer 4 in mitigating the stress of water freezing and expansion.

[0033] Working principle: This embodiment provides a frost-resistant and crack-resistant fire-fighting pipeline structure suitable for low-temperature environments. First, the insulation layer 2 in the pipeline can insulate the water source inside the pipeline to prevent freezing and protect the pipeline from freezing and cracking. Normal water flow is in a flowing state. When it flows through the groove 5, although there is water flow in the groove 5, the water flow is fluid. When the local pressure changes, the water flow will quickly adjust. If the water source inside the pipeline freezes and expands in a low-temperature environment, the pressure generated by the volume expansion is static and continuously increasing. At this time, the pressure generated by freezing will first squeeze out the water that was originally flowing in the groove 5, thereby making room for the expansion of the ice body and realizing the expansion effect of the frozen water. This accommodates a part of the water source freezing and expansion. The remaining expansion stress will act on the rubber pipe layer 4. With the cooperation of the buffer cavity 6, the rubber pipe layer 4 can undergo effective elastic deformation, thereby absorbing the remaining expansion stress. Finally, the stress transmitted to the inner pipe layer 3 is almost gone, thus greatly realizing the effective frost-resistant and crack-resistant protection of the pipeline transporting tap water in a low-temperature environment.

[0034] Secondly, the hexagonal honeycomb structure 702 forms regularly arranged elastic buffer units within the buffer cavity 6. When the tap water inside freezes and expands, the hexagonal honeycomb structure 702 of the rubber outer ring 701 undergoes elastic deformation, which can better absorb the expansion stress. Moreover, under the action of water flow pressure, the regularly arranged honeycomb holes will support each other between the hole walls, dispersing the pressure brought by the water flow. This allows the rubber tube layer 4 to be evenly stressed as a whole, avoiding excessive local compression. The hole walls will undergo slight elastic deformation to absorb the pressure, just like a spring. Within a certain range, it can maintain a stable elastic buffering capacity and will not be easily compressed to the limit by the water flow. This ensures that the rubber tube layer 4 can effectively buffer the impact of water flow during normal use, without being squeezed by the water flow to the point of losing its buffering effect, further ensuring the effectiveness of the rubber tube layer 4 in mitigating the stress of water freezing and expansion.

[0035] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.

Claims

1. A freeze-resistant and crack-resistant fire-fighting pipeline structure suitable for low-temperature environments, characterized in that, It includes an outer tube layer (1), an insulation layer (2), and an inner tube layer (3). The inner tube layer (3) is located inside the outer tube layer (1), and the insulation layer (2) is located between the outer tube layer (1) and the inner tube layer (3). A rubber tube layer (4) is arranged on the inner wall of the inner tube layer (3). Several sets of grooves (5) are equally spaced on the inner wall of the rubber tube layer (4). Several sets of buffer cavities (6) are equally spaced on the wall of the rubber tube layer (4). A rubber reinforcing strip (7) is arranged in the buffer cavity (6). The rubber reinforcing strip (7) includes a rubber outer ring (701). The inner cavity of the rubber outer ring (701) is a hexagonal honeycomb structure (702).

2. The antifreeze and crack-resistant fire-fighting pipeline structure suitable for low-temperature environments according to claim 1, characterized in that, The groove (5) is semi-circular, and the depth of the groove (5) is half that of the rubber tube layer (4).

3. The antifreeze and crack-resistant fire-fighting pipeline structure suitable for low-temperature environments according to claim 1, characterized in that, The rubber tube layer (4) is provided with rubber sealing rings (8) at both ends, and the rubber sealing rings (8) are provided with protrusions (801) corresponding to the buffer cavity (6) on the side facing the rubber tube layer (4).

4. The antifreeze and crack-resistant fire-fighting pipeline structure suitable for low-temperature environments according to claim 3, characterized in that, The rubber tube layer (4), rubber reinforcing strip (7) and rubber sealing ring (8) are all made of hydrogenated nitrile rubber.

5. The antifreeze and crack-resistant fire-fighting pipeline structure suitable for low-temperature environments according to claim 1, characterized in that, The rubber tube layer (4) includes an outer layer (401) and an inner layer (402). The inner layer (402) is located inside the outer layer (401), and a number of connecting strips (403) are arranged at equal intervals between the outer layer (401) and the inner layer (402).

6. A frost-resistant and crack-resistant fire-fighting pipeline structure suitable for low-temperature environments according to claim 5, characterized in that, The outer layer (401) has a Shore hardness of 75-80, and the inner layer (402) has a Shore hardness of 60-65.

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