A cold-resistant and low-temperature resistant metal hose

Abstract

This utility model relates to the field of metal hoses and discloses a cold-resistant and low-temperature resistant metal hose, including an inner tube with multiple rings on its outer side, connectors at both ends of the inner tube, a sheath on the outer side of the inner tube, a cold-resistant component inside the inner tube, and a corrosion-resistant component on the outer side of the sheath. In this utility model, in low-temperature environments, the metal hose operates through a multi-layered structure. The main body layer provides structural support and maintains the hose's shape; the polytetrafluoroethylene layer is cold-resistant, flexible, and non-brittle, isolating the hose from low temperatures while ensuring media transport; the beryllium bronze layer exhibits good strength and toughness at low temperatures, preventing structural damage; the outermost rings and the beryllium bronze layer form a corrugation, reinforcing the inner tube, limiting deformation, and preventing interlayer separation, thus achieving stable operation in extreme low-temperature environments and reliable operation in scenarios such as cryogenic transportation.

Description

Technical Field

[0001] This utility model relates to the field of metal hoses, and more particularly to a cold-resistant and low-temperature resistant metal hose. Background Technology

[0002] Metal flexible hoses are flexible tubular devices, typically made of metal materials such as stainless steel. Their outer layer is usually a braided mesh, while the inner layer is a smooth metal corrugated tube. This structure allows them to move flexibly in complex environments, effectively buffering vibrations and compensating for displacement, while protecting internal cables or fluid media from external interference. They are widely used in machinery manufacturing, petrochemicals, building water supply and drainage, aerospace, and other fields.

[0003] In cold regions, low-temperature industrial environments, and highly corrosive scenarios such as chemical engineering, marine engineering, and wastewater treatment, ordinary metal hoses face severe challenges. At low temperatures, the material becomes brittle, causing a sharp drop in the toughness of the corrugated pipe and braided mesh sleeve. Under pressure or external impact, they are prone to cracking or even breaking. The sealing components also lose elasticity due to low-temperature hardening, leading to media leakage. If fluids are being transported, solidification and blockage may occur, or abnormal pressure caused by volume changes may lead to hose bursting. In highly corrosive environments, ordinary materials are prone to chemical or electrochemical corrosion after contact with acid and alkali solutions, salt spray, and corrosive gases. This causes the pipe wall to thin, its strength to decrease, and eventually to rupture and leak. The failure of the outer braided mesh sleeve after corrosion further accelerates the damage to the internal corrugated pipe. Therefore, a cold-resistant and low-temperature resistant metal hose is proposed to solve the above problems. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a cold-resistant and low-temperature resistant metal hose, aiming to improve the corrosion resistance and low-temperature resistance of metal hoses.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a cold-resistant and low-temperature resistant metal hose, comprising an inner tube, a plurality of rings provided on the outer side of the inner tube, connectors provided at both ends of the inner tube, a sheath provided on the outer side of the inner tube, a cold-resistant component provided inside the inner tube, and a corrosion-resistant component provided on the outer side of the sheath.

[0006] The cold-resistant component includes a main body layer, a polytetrafluoroethylene layer on the outside of the main body layer, and a beryllium bronze layer on the outside of the polytetrafluoroethylene layer.

[0007] As a further description of the above technical solution:

[0008] The corrosion-resistant component includes a stainless steel layer, a polyethylene layer disposed on the outside of the stainless steel layer, a metal woven mesh disposed on the outside of the polyethylene layer, and a coating disposed on the outside of the metal woven mesh.

[0009] As a further description of the above technical solution:

[0010] The stainless steel layer is disposed on the outside of the inner tube and on the outside of the circular ring.

[0011] As a further description of the above technical solution:

[0012] The beryllium bronze layer is disposed on the inner side of the ring.

[0013] As a further description of the above technical solution:

[0014] The connector is located on the outside of the sheath.

[0015] As a further description of the above technical solution:

[0016] The ring is disposed inside the sheath.

[0017] As a further description of the above technical solution:

[0018] The main body layer is made of stainless steel.

[0019] As a further description of the above technical solution:

[0020] The coating material is a zinc-aluminum-magnesium alloy.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, in a low-temperature environment, the metal hose operates through a multi-layer structure. The main body layer provides structural support and maintains the shape of the hose; the polytetrafluoroethylene layer is resistant to low temperatures, flexible and non-brittle, isolates the low temperature and ensures the transport of the medium; the beryllium bronze layer has good strength and toughness at low temperatures, preventing structural damage; the outermost ring and the beryllium bronze layer form a corrugation, which strengthens the inner tube, limits deformation, and avoids interlayer separation, thus achieving stable operation in extreme low-temperature environments and reliable operation in scenarios such as cryogenic transportation.

[0023] 2. In this utility model, the metal hose achieves corrosion resistance through a multi-layered structure. The stainless steel layer acts as a passivation film to resist chemical media; the outer polyethylene layer, with its chemical inertness, blocks acids, alkalis, salts, and organic solvents; the metal braided mesh forms a physical barrier, reducing corrosive contact and enhancing impact resistance; the outermost zinc-aluminum-magnesium alloy coating combines the sacrificial anode properties of zinc, the oxide film barrier of aluminum, and the self-healing properties of magnesium, which can inhibit corrosion even if damaged. This achieves comprehensive protection of the internal structure of the metal hose under long-term erosion by strong corrosive media such as acids, alkalis, and salts, ensuring continuous and stable operation in complex and harsh working conditions. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of a cold-resistant and low-temperature resistant metal hose proposed in this utility model;

[0025] Figure 2 An exploded three-dimensional schematic diagram of a connector for a cold-resistant and low-temperature resistant metal hose proposed in this utility model;

[0026] Figure 3 This is a schematic diagram of the ring structure of a cold-resistant and low-temperature resistant metal hose proposed in this utility model;

[0027] Figure 4 This is a schematic diagram of the main body layer of a cold-resistant and low-temperature resistant metal hose proposed in this utility model;

[0028] Figure 5 This is a schematic diagram of the coating structure of a cold-resistant and low-temperature resistant metal hose proposed in this utility model.

[0029] Legend:

[0030] 1. Sheath; 2. Connector; 3. Inner tube; 4. Ring; 5. Main body layer; 6. Polytetrafluoroethylene layer; 7. Beryllium bronze layer; 8. Stainless steel layer; 9. Polyethylene layer; 10. Metal braided mesh; 11. Coating. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figures 1-5 This utility model provides an embodiment of a cold-resistant and low-temperature resistant metal hose, including an inner tube 3, multiple rings 4 on the outside of the inner tube 3, connectors 2 at both ends of the inner tube 3, a sheath 1 on the outside of the inner tube 3, a cold-resistant component inside the inner tube 3, and a corrosion-resistant component on the outside of the sheath 1. The inner tube 3, as the main body of the metal hose, is the part of the metal hose that directly contacts the conveying medium and is responsible for constructing the flow path of the medium. The multiple rings 4 form annular corrugations, which can disperse external pressure and convert it into uniform circumferential stress, thereby improving compressive strength. The connectors 2 securely connect the hose to the equipment and pipeline through a threaded structure, solving the compressive strength and tensile strength problem of the connectors 2. The sheath 1 strengthens and protects the inner tube 3, improving the compressive strength and tensile strength of the metal hose, and also preventing the inner tube 3 from being scratched and bumped by external objects. The cold-resistant component is used to improve the cold and low-temperature resistance of the metal hose, and the corrosion-resistant component is used to improve the corrosion resistance of the metal hose.

[0033] The cold-resistant component includes a main body layer 5, a polytetrafluoroethylene (PTFE) layer 6 on the outside of the main body layer 5, and a beryllium bronze layer 7 on the outside of the PTFE layer 6. The main body layer 5 ensures that the hose maintains structural stability when subjected to various mechanical stresses, and is not easily deformed or broken, providing a solid support skeleton for the entire hose. The PTFE layer 6 has extremely strong chemical inertness and can withstand extreme temperatures from -190℃ to 260℃. It does not harden or crack at low temperatures, nor does it soften or deform at high temperatures. The beryllium bronze layer 7 has excellent mechanical properties, maintaining good strength and toughness even at low temperatures. It has strong fatigue resistance and is not easily broken due to vibration or low-temperature embrittlement.

[0034] The corrosion-resistant components include a stainless steel layer 8, a polyethylene layer 9 on the outside of the stainless steel layer 8, a metal braided mesh 10 on the outside of the polyethylene layer 9, and a coating 11 on the outside of the metal braided mesh 10. The stainless steel layer 8 can resist corrosion from acids, alkalis, salt spray, and humid environments, preventing rust caused by contact between the medium and the metal, avoiding structural embrittlement and leakage problems caused by corrosion, extending service life, and providing reliable protection for medium transportation. The polyethylene layer 9 has good chemical stability and strong barrier properties, which can prevent corrosive media from penetrating into the hose. The metal braided mesh 10 itself has the characteristics of resisting corrosion from acids, alkalis, salt spray, and humid environments, and can directly block external corrosive media from contacting the internal pipe body. The coating 11 enhances corrosion resistance through the dual effects of physical barrier and chemical protection.

[0035] The stainless steel layer 8 is located on the outside of the inner tube 3 and on the outside of the ring 4. The stainless steel layer 8 is used to fill the gap between the inner tube 3 and the polyethylene layer 9.

[0036] The beryllium bronze layer 7 is located inside the ring 4, and the ring 4 is located outside the beryllium bronze layer 7 to perform its function.

[0037] The connector 2 is located on the outside of the sheath 1, and the sheath 1 provides all-round protection for the inner tube 3 by being located on the outside of the connector 2.

[0038] The ring 4 is set inside the sheath 1, and the sheath 1 is secured by being set outside the ring 4.

[0039] The main layer 5 is made of stainless steel. Due to its special crystal structure and alloy composition, the main layer 5 has significant advantages in low-temperature resistance.

[0040] Coating 11 is made of zinc-aluminum-magnesium alloy. Coating 11 significantly improves corrosion resistance by means of a multi-metal synergistic protection mechanism.

[0041] Working principle:

[0042] In low-temperature environments, the metal hose achieves stable performance through its multi-layered structure. The main body layer 5 serves as the basic skeleton, providing necessary structural support for the hose and ensuring its basic shape. The polytetrafluoroethylene (PTFE) layer 6 wraps around the outside of the main body layer 5, possessing the characteristic of withstanding extreme low temperatures. It does not harden or crack in severe cold, maintaining its flexibility. It can both isolate the main body layer 5 from low-temperature corrosion and ensure unobstructed internal media transport. The beryllium bronze layer 7 covers the PTFE layer 6. Beryllium bronze maintains excellent strength and toughness at low temperatures, preventing structural damage caused by low-temperature embrittlement and ensuring sealing and stability. The outermost multiple rings 4, together with the beryllium bronze layer 7, form annular corrugations, reinforcing the inner tube 3 from the outside, limiting the deformation of each layer caused by low temperatures, preventing interlayer separation, and working in conjunction with other structures to ensure reliable operation of the metal hose under low-temperature conditions.

[0043] The metal hose achieves excellent corrosion resistance through the synergistic effect of its multi-layer structure. The stainless steel layer 8 serves as the basic protective layer, and its passivation film properties can resist the erosion of various chemical media. The outer polyethylene layer 9 utilizes its chemical inertness to further block acids, alkalis, salt solutions, and organic solvents, preventing corrosive substances from penetrating into the inner layer. The metal braided mesh 10 outside the polyethylene layer 9 forms a physical barrier through its dense mesh structure, reducing the contact between corrosive media and the inner layer, and enhancing the overall impact resistance of the hose. The outermost zinc-aluminum-magnesium alloy coating 11, through the sacrificial anode effect of zinc, the dense oxide film barrier of aluminum, and the self-healing properties of magnesium, can continuously inhibit corrosion even if the coating 11 is locally damaged. The combined effect of multiple protections ensures the stable operation of the metal hose in highly corrosive environments.

[0044] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cold-resistant and low-temperature resistant metal flexible hose, comprising an inner tube (3), characterized in that: Multiple rings (4) are provided on the outside of the inner tube (3), connectors (2) are provided at both ends of the inner tube (3), a sheath (1) is provided on the outside of the inner tube (3), a cold-resistant component is provided inside the inner tube (3), and a corrosion-resistant component is provided on the outside of the sheath (1). The cold-resistant component includes a main body layer (5), a polytetrafluoroethylene layer (6) is provided on the outside of the main body layer (5), and a beryllium bronze layer (7) is provided on the outside of the polytetrafluoroethylene layer (6).

2. The cold-resistant and low-temperature resistant metal hose according to claim 1, characterized in that: The corrosion-resistant component includes a stainless steel layer (8), a polyethylene layer (9) disposed on the outside of the stainless steel layer (8), a metal woven mesh (10) disposed on the outside of the polyethylene layer (9), and a coating (11) disposed on the outside of the metal woven mesh (10).

3. The cold-resistant and low-temperature resistant metal hose according to claim 2, characterized in that: The stainless steel layer (8) is disposed on the outside of the inner tube (3) and on the outside of the ring (4).

4. The cold-resistant and low-temperature resistant metal hose according to claim 1, characterized in that: The beryllium bronze layer (7) is disposed inside the ring (4).

5. The cold-resistant and low-temperature resistant metal hose according to claim 1, characterized in that: The connector (2) is disposed on the outside of the sheath (1).

6. The cold-resistant and low-temperature resistant metal hose according to claim 1, characterized in that: The ring (4) is disposed inside the sheath (1).

7. The cold-resistant and low-temperature resistant metal hose according to claim 1, characterized in that: The main body layer (5) is made of stainless steel.

8. The cold-resistant and low-temperature resistant metal hose according to claim 2, characterized in that: The coating (11) is made of zinc-aluminum-magnesium alloy.

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