Bending-resistant low-temperature-resistant pipe fitting
Through the combined design of inner and outer pipe layers, insulation layer and anti-bending layer, the problem of brittleness of PPR pipe fittings in low temperature environment is solved, the anti-bending and thermal insulation effects are achieved, and the stability and durability of the pipe fittings are improved.
Patent Information
- Application Number
- CN202422822428.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-11-19
AI Technical Summary
PPR pipe fittings tend to become brittle in low-temperature environments, resulting in decreased drop resistance and impaired stability, posing a safety hazard.
The structural design adopts an inner pipe layer, an outer pipe layer, an insulation layer and an anti-bending layer. The anti-bending layer is provided with reinforcing ribs and a waterproof layer. The anti-bending layer is tightly fitted to the inner pipe layer and has high bending strength. The inner and outer pipe layers use insulation materials and filling layers to slow down heat loss, and the anti-cold filling material and aluminum foil thin layer enhance the insulation effect.
It effectively prevents pipe fittings from bending and deforming in low temperature environments, improves the compressive performance and stability of pipe fittings, extends their service life, and reduces the risk of brittleness.
Smart Images
Figure CN223424936U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of low-temperature PPR pipe fittings, and more specifically, to a bending-resistant and low-temperature-resistant pipe fitting. Background Art
[0002] In the field of piping engineering, polypropylene random copolymer (PPR) pipe fittings are widely used in hot and cold water supply systems, heating systems, and various industrial fluid transmission systems due to their excellent heat resistance, corrosion resistance, and relatively light weight. However, despite their many advantages, PPR pipe fittings have certain performance limitations in certain low-temperature environments.
[0003] Specifically, when the ambient temperature drops significantly, PPR pipe fittings are susceptible to the effects of cold air, causing changes in their molecular structure and, in turn, making the pipes relatively fragile. This embrittlement not only reduces the resistance of PPR pipe fittings to drops during installation, increasing the risk of accidental breakage, but also poses a serious threat to the pipe's stability and durability. If pipe fittings break or become damaged during installation or use, it not only wastes resources but can also lead to a series of safety hazards, causing inconvenience to people's production and daily lives, thereby reducing the stability and durability of PPR pipe fittings.
[0004] The prior art discloses an insulation structure for a low-temperature pipe expansion joint. The structure comprises, from the inside out, a first insulation layer, a second insulation layer, and a protective shell. The first and second insulation layers are provided with first and second buffer layers, respectively. A gas barrier layer is provided between the protective shell and the expansion joint, with adhesive layers provided at both ends of the gas barrier layer. The low-temperature pipe is bonded to the inner wall of the insulation structure. This solves the problem of material cracking in insulated pipes in low-temperature environments in the prior art. By providing an insulation structure for the expansion joint, the low-temperature pipe can be insulated under contraction and expansion conditions.
[0005] Although the insulation structure of the low-temperature pipeline expansion joint in the above-mentioned prior art has a good insulation effect in engineering application, the pipeline is subjected to the influence of the external low temperature. Due to the temperature difference between the inside and outside of the pipe, the expansion rate inside and outside the pipe is different, which will cause bending. At the same time, when the pipeline is subjected to a bending moment perpendicular to the axis of the pipe during installation and operation, it is more likely to damage the insulation layer and make the insulation ineffective. Utility Model Content
[0006] The purpose of the utility model is to overcome the problem in the prior art that low-temperature pipelines may bend when subjected to external low temperatures or bending moments perpendicular to the pipeline axis, and to provide a bending-resistant and low-temperature resistant pipe fitting.
[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:
[0008] Provided is a bending-resistant and low-temperature resistant pipe fitting, comprising an inner pipe layer, an outer pipe layer, an insulation layer and an anti-bending layer, wherein the anti-bending layer is fixedly connected to the outer surface of the inner pipe layer, and the insulation layer is fixedly connected to the outer surface of the anti-bending layer, wherein the insulation layer is made of polyethylene insulation material, has good insulation performance, can further reduce the impact of cold air on the inside of the pipe fitting, improves the overall insulation effect, and enables the pipe fitting to maintain stable performance in a cold environment.
[0009] During the operation of the above scheme, when the pipe is in a relatively cold environment, cold air invades the inner pipe layer from the outside through the outer pipe layer. During this process, the heat of the inner pipe layer begins to dissipate, but the thermal conductivity of the insulation layer is low, which greatly slows down the heat loss rate of the inner pipe layer, thereby achieving thermal insulation of the inner pipe layer. At the same time, in the process of heat dissipation, the temperature difference between the inside and outside of the inner pipe wall begins to become inconsistent, resulting in different expansion rates inside and outside, which will cause bending. However, the anti-bending layer fits tightly with the inner pipe layer, and the anti-bending layer has a high bending strength. When the inner pipe layer bends, the anti-bending layer forcibly corrects the inner pipe layer, effectively avoiding its bending deformation. At the same time, it can also prevent the insulation layer from being damaged and causing the insulation to fail when the pipeline is subjected to a bending moment perpendicular to the pipeline axis during installation and operation.
[0010] Furthermore, a plurality of reinforcing ribs are provided in the anti-bending layer, and the plurality of reinforcing ribs are located in the anti-bending layer and are evenly distributed circumferentially; the reinforcing ribs in the wire pipe are mainly used to protect the inner pipe layer by enhancing the hardness and pressure resistance inside the pipe, and to prevent the inner pipe layer from bending due to extrusion by external forces or temperature differences between the inside and outside. The hardness and pressure resistance of the reinforcing ribs should be high, which can effectively enhance the anti-bending ability of the inner pipe layer, improve the strength and stability of the wire pipe, and make it more durable.
[0011] Furthermore, the reinforcing ribs are long strips and made of metal material; the metal material here can be steel material, and the steel wire has high hardness and strength. Adding steel wire can effectively improve the hardness of the anti-bending layer. At the same time, the toughness and pressure resistance of the steel wire are very good, which can effectively enhance the pressure resistance of the anti-bending layer, thereby improving the service life of the anti-bending layer.
[0012] Furthermore, it also includes a filling layer, which is fixedly connected to the outer surface of the insulation layer; the close fit between the filling layer and the insulation layer can further reduce the impact of cold air on the inside of the pipe, improve the overall insulation effect, and enable the pipe to maintain stable performance in a cold environment.
[0013] Furthermore, it also includes an anti-cold filler, the outer surface of the filling layer is provided with an annular groove, and the anti-cold filler is filled and installed in the annular groove; a closed filling space is formed between the filling layer and the outer tube layer, and the anti-cold filler is located inside the filling space of the filling layer.
[0014] Furthermore, the material of the anti-cold filler is rock wool material; rock wool has excellent thermal insulation performance, low thermal conductivity, high thermal resistance, and can effectively prevent heat transfer. At the same time, rock wool material has excellent chemical corrosion resistance and moisture resistance, and can maintain the stability of its physical and chemical properties for a long time, effectively improving its service life.
[0015] Furthermore, a thin layer of aluminum foil is provided on the outer surface of the anti-cold filler, and the thin layer of aluminum foil is connected to the outer tube layer; the outer surface of the anti-cold filler is covered with aluminum foil, and the thin layer of aluminum metal has a high thermal insulation capacity, which effectively resists the invasion of external cold air, significantly reduces the risk of brittleness of the pipe in a low temperature environment, and ensures the stability and durability of the pipe.
[0016] Furthermore, it also includes a waterproof layer, and the anti-bending layer and the inner tube layer are fixedly connected through the waterproof layer; the waterproof layer can prevent the liquid in the inner tube layer from leaking and contaminating and corroding the anti-bending layer, causing the anti-bending layer to be corroded and the anti-bending strength to be reduced.
[0017] Furthermore, the waterproof layer is provided with a plurality of cavities which penetrate the waterproof layer axially, and the cavities are located in the waterproof layer and are distributed circumferentially; the plurality of cavities are arranged in a ring shape on the waterproof layer. Through the design of opening cavities on the waterproof layer, the cold air needs to pass through the air inside the cavity before being transmitted to the inner tube layer. The thermal conductivity of air is extremely low, which can slow down the transmission speed of the cold air, thereby reducing the risk of the inner tube layer being affected by the cold air and providing more comprehensive protection for the pipe.
[0018] Furthermore, the waterproof layer is made of rubber material; the waterproof layer is made of rubber material, and rubber has high stability in acidic or alkaline water environments, and is corrosion-resistant while being waterproof, thereby increasing the service life of the waterproof layer.
[0019] Compared with the prior art, the present invention has the following beneficial effects:
[0020] 1. A protective structure of a thermal insulation layer and an anti-bending layer is set outside the inner pipe layer to effectively slow down the heat loss of the inner pipe layer in a relatively cold environment and realize thermal insulation of the inner pipe layer. The anti-bending layer has a high bending strength. When the inner pipe layer bends, the anti-bending layer forcibly corrects the inner pipe layer to effectively avoid its bending deformation. At the same time, it can also prevent the thermal insulation layer from being damaged and causing thermal insulation failure when the pipeline is subjected to a bending moment perpendicular to the pipeline axis during installation and operation.
[0021] 2. The interior of the anti-bending layer is fixedly connected with several long steel reinforcing ribs, which are distributed in a ring shape on the anti-bending layer. The long steel reinforcing ribs arranged inside the anti-bending layer not only enhance the bending resistance of the pipe fittings, but also improve their toughness in low temperature environments, effectively preventing the pipe fittings from breaking due to excessive bending, extending the service life of the pipe fittings and increasing the pipe fittings' resistance to brittleness.
[0022] 3. The filling layer is fixedly connected to the outer surface of the insulation layer; the close fit between the filling layer and the insulation layer can further reduce the impact of cold air on the inside of the pipe fittings and improve the overall insulation effect. The outer surface of the filling layer is provided with an annular groove, and the anti-cold filler is filled in the groove space. The outer surface of the anti-cold filler is also provided with a thin layer of aluminum foil. The aluminum metal thin layer has a high thermal insulation capacity, which effectively resists the intrusion of external cold air, significantly reduces the risk of brittleness of the pipe fittings in low temperature environments, and ensures the stability and durability of the pipe fittings. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 A three-dimensional diagram of a bending-resistant and low-temperature-resistant pipe fitting;
[0024] Figure 2 Schematic diagram of a cross-section of a bending-resistant and low-temperature-resistant pipe fitting;
[0025] Figure 3 This is a diagram of the internal structure of a bending-resistant and low-temperature-resistant pipe fitting;
[0026] Figure 4 This is a schematic diagram of the internal structure of the pipe filling layer of a bending-resistant and low-temperature-resistant pipe fitting.
[0027] In the accompanying drawings: 1. Inner tube layer; 2. Waterproof layer; 210. Cavity; 3. Anti-bending layer; 310. Reinforcement ribs; 4. Insulation layer; 5. Filling layer; 510. Anti-cold filler; 520. Annular groove; 6. Outer tube layer. DETAILED DESCRIPTION
[0028] The present invention is further described below in conjunction with specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic, not actual, representations. They should not be construed as limiting this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted from the drawings.
[0029] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and so on indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.
[0030] Example 1
[0031] This embodiment is a first embodiment of a bending-resistant and low-temperature-resistant pipe fitting. Figures 1 to 3 As shown, it includes an inner tube layer 1 and an outer tube layer 6, and also includes a thermal insulation layer 4 and an anti-bending layer 3. The anti-bending layer 3 is fixedly connected to the outer surface of the inner tube layer 1, and the thermal insulation layer 4 is fixedly connected to the outer surface of the anti-bending layer 3. The thermal insulation layer 4 is made of polyethylene thermal insulation material, which has good thermal insulation performance, can further reduce the impact of cold air on the inside of the pipe, improve the overall thermal insulation effect, and enable the pipe to still maintain stable performance in a cold environment.
[0032] Specifically, a plurality of reinforcing ribs 310 are provided in the anti-bending layer 3, and the plurality of reinforcing ribs 310 are located in the anti-bending layer 3 and are evenly distributed circumferentially. The reinforcing ribs 310 added to the wire pipe are mainly used to protect the inner pipe layer 1 by enhancing the hardness and pressure resistance of the inside of the pipe, and to prevent the inner pipe layer 1 from bending due to external force squeezing or temperature difference between the inside and the outside. The hardness and pressure resistance of the reinforcing ribs 310 should be high, which can effectively enhance the anti-bending ability of the inner pipe layer 1, improve the strength and stability of the wire pipe, and make it more durable.
[0033] Specifically, the reinforcing rib 310 is long and made of metal material; the metal material here specifically refers to steel material. Steel wire has high hardness and strength. Adding steel wire can effectively improve the hardness of the anti-bending layer 3. At the same time, the toughness and pressure resistance of the steel wire are very good, which can effectively enhance the pressure resistance of the anti-bending layer 3, thereby improving the service life of the anti-bending layer 3.
[0034] Specifically, it also includes a waterproof layer 2, and the anti-bending layer 3 is fixedly connected to the inner tube layer 1 through the waterproof layer 2; the waterproof layer 2 can prevent the liquid in the inner tube layer 1 from leaking and contaminating and corroding the anti-bending layer 3, causing the anti-bending layer 3 to be corroded and the anti-bending degree to be reduced.
[0035] Specifically, the waterproof layer 2 is provided with a plurality of cavities 210 which penetrate the waterproof layer 2 axially. The cavities 210 are located in the waterproof layer 2 and are distributed circumferentially. The plurality of cavities 210 are arranged in a ring shape on the waterproof layer 2. Through the design of the cavities 210 opened on the waterproof layer 2, the cold air needs to pass through the air inside the cavity 210 before being transmitted to the inner tube layer 1. The thermal conductivity of the air is extremely low, which can slow down the transmission speed of the cold air, thereby reducing the risk of the inner tube layer 1 being affected by the cold air and providing more comprehensive protection for the pipe.
[0036] Specifically, the waterproof layer 2 is made of rubber material; the waterproof layer 2 is made of rubber material, and rubber has high stability in acidic or alkaline water environments. It is waterproof and corrosion-resistant at the same time, thereby increasing the service life of the waterproof layer 2.
[0037] The working principle of a bending-resistant and low-temperature resistant pipe fitting in this embodiment is as follows: when the pipe fitting is in a relatively cold environment, cold air invades the inner pipe layer 1 from the outside through the outer pipe layer 6. In this process, the heat of the inner pipe layer 1 passes through the waterproof layer 2. The waterproof layer 2 can effectively block the leakage of moisture when the inner pipe layer 1 leaks. A cavity 210 is provided in the waterproof layer 2. The thermal conductivity of the air in the cavity 210 is low, which slows down the transfer of heat for the first time. After passing through the anti-bending layer 3, the anti-bending layer 3 fits tightly with the waterproof layer 2. At the same time, the anti-bending layer 3 has high bending strength. When the inner pipe layer 1 bends, the anti-bending layer 3 forcibly corrects the inner pipe layer 1 wrapped by the waterproof layer 2 to avoid its bending and deformation. After passing through the thermal insulation layer 4, the thermal insulation layer 4 slows down the transfer of heat for the second time, thereby achieving double heat protection for the inner pipe layer 1.
[0038] The beneficial effects of this embodiment are as follows: the thermal insulation layer 4 has a low thermal conductivity, which greatly slows down the heat loss rate of the inner tube layer 1, thereby achieving thermal insulation of the inner tube layer 1; the anti-bending layer 3 has a high bending strength, and when the inner tube layer 1 bends, the anti-bending layer 3 forcibly corrects the inner tube layer 1, effectively preventing its bending deformation.
[0039] Example 2
[0040] This embodiment is a second embodiment of a bending-resistant and low-temperature-resistant pipe fitting. Figures 3 to 4 As shown, it includes an inner tube layer 1 and an outer tube layer 6, and also includes a thermal insulation layer 4 and an anti-bending layer 3. The anti-bending layer 3 is fixedly connected to the outer surface of the inner tube layer 1, and the thermal insulation layer 4 is fixedly connected to the outer surface of the anti-bending layer 3. The thermal insulation layer 4 is made of polyethylene thermal insulation material, which has good thermal insulation performance, can further reduce the impact of cold air on the inside of the pipe, improve the overall thermal insulation effect, and enable the pipe to still maintain stable performance in a cold environment.
[0041] Specifically, it also includes a filling layer 5, which is fixedly connected to the outer surface of the insulation layer 4; the close fit between the filling layer 5 and the insulation layer 4 can further reduce the impact of cold air on the inside of the pipe, improve the overall insulation effect, and enable the pipe to still maintain stable performance in a cold environment.
[0042] Specifically, it also includes an anti-cold filler 510, and an annular groove 520 is provided on the outer surface of the filling layer 5, and the anti-cold filler 510 is filled and installed in the annular groove 520; a closed filling space is formed between the filling layer 5 and the outer tube layer 6, and the anti-cold material is located inside the space of the filling layer 5.
[0043] Specifically, the material of the anti-cold filler 510 is rock wool material; rock wool has excellent thermal insulation performance, low thermal conductivity, high thermal resistance, and can effectively prevent heat transfer. At the same time, rock wool material has excellent chemical corrosion resistance and moisture resistance, and can maintain the stability of its physical and chemical properties for a long time, effectively improving its service life.
[0044] The working principle of a bend-resistant and low-temperature resistant pipe fitting in this embodiment is as follows: when the pipe fitting is in a relatively cold environment, cold air invades the inner pipe layer 1 from the outside through the outer pipe layer 6. In this process, when the heat of the inner pipe layer 1 is transferred to the filling layer 5, the rock wool cold-resistant filler 510 can effectively prevent the transfer of heat due to its low thermal conductivity, thereby effectively controlling heat loss.
[0045] Beneficial effects of this embodiment: the rock wool cold-resistant filler 510 effectively controls heat loss, thereby reducing the risk of the inner pipe layer 1 being affected by cold air, and providing more comprehensive protection for the pipe.
[0046] Example 3
[0047] This embodiment is a third embodiment of a bending-resistant and low-temperature-resistant pipe fitting, which differs from the second embodiment in that:
[0048] Specifically, the outer surface of the anti-cold filler 510 is also provided with a thin layer of aluminum foil, which is connected to the outer tube layer 6; the outer surface of the anti-cold filler 510 is covered with aluminum foil, and the aluminum metal thin layer has a high thermal insulation ability, which effectively resists the invasion of external cold air, significantly reduces the risk of brittleness of the pipe in a low temperature environment, and ensures the stability and durability of the pipe.
[0049] The working principle of a bend-resistant and low-temperature resistant pipe fitting in this embodiment is as follows: when the pipe fitting is in a relatively cold environment, cold air invades the inner pipe layer 1 from the outside through the outer pipe layer 6. During this process, the heat of the inner pipe layer 1 begins to dissipate. However, the thin aluminum metal layer has a high thermal insulation ability, and the internal heat cannot be transferred to the outside through thermal radiation, effectively controlling the heat loss.
[0050] Beneficial effects of this embodiment: The aluminum foil covering on the outer surface of the cold-resistant filler 510 effectively controls heat loss, thereby reducing the risk of the inner pipe layer 1 being affected by cold air and providing more comprehensive protection for the pipe.
[0051] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0052] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.
Claims
1. A bending-resistant and low-temperature-resistant pipe fitting, comprising an inner pipe layer (1) and an outer pipe layer (6), characterized in that: It also includes a heat-insulating layer (4) and an anti-bending layer (3) located between the inner tube layer (1) and the outer tube layer (6), the anti-bending layer (3) being fixedly connected to the outer surface of the inner tube layer (1), and the heat-insulating layer (4) being fixedly connected to the outer surface of the anti-bending layer (3).
2. The bending-resistant and low-temperature-resistant pipe fitting according to claim 1, characterized in that: A plurality of reinforcing ribs (310) are provided in the anti-bending layer (3), and the plurality of reinforcing ribs (310) are located in the anti-bending layer (3) and are evenly distributed in the circumferential direction.
3. The bending-resistant and low-temperature-resistant pipe fitting according to claim 2, characterized in that: The reinforcing rib (310) is in the shape of an elongated strip and is made of metal material.
4. The bending-resistant and low-temperature-resistant pipe fitting according to claim 1, characterized in that: It also includes a filling layer (5), wherein the filling layer (5) is fixedly connected to the outer surface of the thermal insulation layer (4).
5. The bending-resistant and low-temperature-resistant pipe fitting according to claim 4, characterized in that: It also includes an anti-cold filler (510), and an annular groove (520) is provided on the outer surface of the filling layer (5), and the anti-cold filler (510) is filled and installed in the annular groove (520).
6. The bending-resistant and low-temperature-resistant pipe fitting according to claim 5, characterized in that: The material of the cold-resistant filler (510) is rock wool material.
7. The bending-resistant and low-temperature-resistant pipe fitting according to claim 5, characterized in that: The outer surface of the cold-resistant filler (510) is further provided with an aluminum foil layer, and the aluminum foil layer is connected to the outer tube layer (6).
8. A bending-resistant and low-temperature-resistant pipe fitting according to any one of claims 1 to 7, characterized in that: It also includes a waterproof layer (2), and the anti-bending layer (3) and the inner tube layer (1) are fixedly connected via the waterproof layer (2).
9. The bending-resistant and low-temperature-resistant pipe fitting according to claim 8, characterized in that: A plurality of cavities (210) are provided in the waterproof layer (2) and penetrate the waterproof layer (2) along the axial direction. The cavities (210) are located in the waterproof layer (2) and are distributed in a circumferential manner.
10. The bending-resistant and low-temperature-resistant pipe fitting according to claim 9, characterized in that: The waterproof layer (2) is made of rubber material.