Metal clad hose for gas

Abstract

The application belongs to the technical field of gas pipeline, and particularly relates to a metal-coated hose for gas, which comprises a first connecting piece, an outer wall of which is provided with a first outer thread, and an inside of which is provided with a first guide straight pipe and a guide inclined pipe which are in communication with each other; a metal bellows, one end of which is inserted into the first guide straight pipe and the guide inclined pipe; a second connecting piece, which is installed on the outside of the metal bellows and is threadedly connected with the first connecting piece, and an inside of which is provided with a second guide straight pipe and a limiting straight pipe which are in communication with each other, an inner thread is arranged on an inner wall of the limiting straight pipe, and an inclined surface is further arranged between the limiting straight pipe and the second guide straight pipe; and a limiting piece, which is annular and is sleeved on the outside of the metal bellows, and is used for filling the gap between the metal bellows and the first connecting piece; wherein after the first connecting piece and the second connecting piece are threadedly matched, the limiting piece is deformed under pressure and is tightly pressed between the guide inclined pipe and the metal bellows.

Description

Technical Field

[0001] This application belongs to the field of gas pipe technology, and particularly relates to a metal-coated flexible hose for gas. Background Technology

[0002] In gas delivery systems, hoses are key components connecting gas sources and gas-consuming equipment, and their connection structure directly affects the safety and stability of gas delivery. Currently, most existing gas hoses use soft materials as sealing or buffer components in their connection structures. These soft materials typically possess a certain degree of initial elasticity, allowing them to adapt to the assembly gaps at the connection points under normal operating conditions, achieving a basic sealing effect.

[0003] However, in high-temperature and high-pressure applications, such as connecting pipelines of industrial gas heating equipment and gas transmission branch pipes in high-temperature environments, when soft materials are exposed to high-temperature and high-pressure environments for extended periods, external impacts (such as accidental collisions during equipment operation and external disturbances after pipeline installation) and continuous vibrations (such as mechanical vibrations generated during gas equipment operation and pipeline vibrations caused by gas flow) will accelerate the degradation of the soft materials' performance. Specifically, the soft materials gradually lose their original elasticity, become harder and more brittle, and can no longer compensate for gap changes at the connection points caused by temperature variations or vibrations through their own elastic deformation.

[0004] This performance degradation directly leads to a significant decrease in the sealing performance of the connection structure. The leaked gas not only wastes energy but may also cause the gas concentration to exceed the standard, posing safety hazards such as explosion and poisoning. Furthermore, the hardened soft material may generate rigid friction with the connection joint, further damaging the integrity of the sealing surface and exacerbating the leakage problem. Improvements are needed in this regard. Utility Model Content

[0005] The purpose of this application is to provide a metal-coated flexible hose for gas applications that can solve the above-mentioned problems.

[0006] The purpose of this application is to provide a metal-coated flexible hose for use with natural gas, comprising:

[0007] The first connector has a first external thread on its outer wall and a first guide straight tube and a guide inclined tube that are interconnected inside.

[0008] A metal bellows, one end of which is inserted into the first guide straight tube and the guide inclined tube;

[0009] The second connector is installed on the outside of the metal bellows and threadedly connected to the first connector. Inside it are a second guide tube and a limiting tube that are interconnected. The inner wall of the limiting tube is provided with an internal thread, and there is also an inclined surface between the limiting tube and the second guide tube.

[0010] The limiting component is ring-shaped and sleeved on the outside of the metal bellows to fill the gap between the metal bellows and the first connecting component;

[0011] When the first connector and the second connector are threaded together, the limiting member is deformed under pressure and pressed between the guide tube and the metal bellows.

[0012] The aforementioned metal-coated flexible hose for gas utilizes a first and second connector that are detachably connected via a threaded connection. This threaded connection offers strong self-locking and tightness, resisting external impacts and vibrations and preventing gaps caused by loosening in existing connections. Simultaneously, a ring-shaped limiting member is fitted around the metal bellows. When the first and second connectors are threaded together, this member deforms under pressure, filling the gap between the bellows and the first connector. This prevents gas leakage due to gaps and creates a tight seal through deformation. Furthermore, the pressure-deformed limiting member accommodates assembly errors between the bellows and the first connector, achieving effective sealing without high-precision machining, reducing assembly difficulty while ensuring sealing reliability.

[0013] Furthermore, in this application, the first guide straight tube and the guide inclined tube inside the first connector are interconnected. The guide straight tube can guide the insertion of the metal bellows, ensuring accurate docking of the metal bellows and avoiding misalignment of the sealing surface caused by insertion offset. The guide inclined tube provides adaptation space for the pressure deformation of the limiting member, guiding the limiting member to fit in the direction of the metal bellows, so that the deformation of the limiting member fits the sealing requirements and further enhances the sealing effect.

[0014] Furthermore, a sealing ring is also fitted over the corrugated pipe, with one end in contact with the inclined surface and the other end in contact with the limiting member, and the sealing ring is made of rubber.

[0015] The rubber sealing ring possesses excellent elasticity, filling the tiny gaps between the sealing ring and the inclined surface and limiting component through its own elastic deformation. This, combined with the sealing effect of the limiting component, forms a double-seal structure, enhancing overall sealing performance and effectively preventing gas leakage. Simultaneously, one end of the sealing ring contacts the inclined surface of the second connector, while the other end contacts the limiting component. The inclined surface evenly transmits the clamping force of the second connector to the sealing ring, ensuring its long-term stable function. Furthermore, the rubber material has a certain buffering capacity, absorbing the impact of external shocks and vibrations on the sealing structure. This reduces the impact of shocks and vibrations on the contact surface between the limiting component and the metal bellows, and alleviates the rigid friction between the metal bellows and the connector, protecting the integrity of the sealing surface.

[0016] Furthermore: the inner wall of the guide tube includes a straight section and an arc section. The inner diameter of the arc section gradually decreases from the straight section to the guide tube. After the limiting member is pressed, its end retracts and fits into the arc section.

[0017] The straight section of the guide tube's inner wall is designed to mate with the metal bellows. The curved section, with its gradually changing inner diameter, guides the end of the limiting component to retract under pressure. This gradually changing diameter structure ensures a smooth and uniform deformation of the limiting component, preventing cracks or damage caused by sudden changes in localized stress. Simultaneously, the retracted end of the limiting component fits tightly against the curved section, increasing the contact area between the limiting component and the guide tube, forming a circumferential sealing structure, and enhancing the seal between the limiting component, the guide tube, and the metal bellows.

[0018] Furthermore, the inner diameter of the second guide tube is smaller than the inner diameter of the limiting tube, and after the first connector and the second connector are threaded together, the inclined surface presses the sealing ring onto the limiting component.

[0019] The inner diameter of the second guide tube is smaller than that of the limiting tube, forming a stepped structure. This structure axially limits the sealing ring and the limiting component, preventing the sealing ring from shifting towards the limiting tube during assembly or use. This ensures the sealing ring remains in an effective sealing position in contact with the inclined surface and the limiting component. When the first and second connectors are threaded together, the inclined surface presses the sealing ring against the limiting component. The axial clamping force generated by the threaded engagement is transmitted to the sealing ring through the inclined surface, causing elastic deformation of the sealing ring. This fills the tiny gaps between the sealing ring and the limiting component, and between the sealing ring and the bellows, significantly improving sealing reliability.

[0020] Furthermore, a sealing cavity is formed between the inclined surface, the limiting member, the guide inclined tube, and the sealing ring.

[0021] The sealing cavity can prevent external impurities from entering the internal area, avoid impurities from adhering to the sealing surface, prevent impurities from reacting chemically with the sealing components and causing deterioration of the sealing components, and extend the service life of the sealing components.

[0022] Furthermore, the sealing ring is fitted onto the recessed portion of the outer wall of the bellows.

[0023] The recessed portion on the outer wall of the bellows provides positioning for the sealing ring, preventing it from being misaligned and ensuring that the sealing ring is always in an effective sealing position in contact with the inclined surface and limiting element, thus guaranteeing the stability of the sealing performance.

[0024] The beneficial effects of this application are:

[0025] 1. The limiting component is ring-shaped and sleeved on the outside of the metal bellows. When the first connector and the second connector are threaded together, it is deformed under pressure, which can fill the gap between the metal bellows and the first connector. This not only avoids gas leakage caused by the gap, but also forms a sealing structure through the tight fit after deformation.

[0026] 2. The pressure-deformed limiting component can adapt to the assembly error between the metal bellows and the first connecting component, and can achieve effective sealing without relying on high-precision machining, reducing assembly difficulty while ensuring sealing reliability.

[0027] 3. The rubber sealing ring has good elasticity. Through its own elastic deformation, it fills the tiny gaps between the sealing ring and the inclined surface and the limiting component. The sealing effect of the sealing ring is superimposed with that of the limiting component to form a double sealing structure, which improves the overall sealing performance and effectively prevents gas leakage. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of this utility model;

[0029] Figure 2 This is a half-sectional view of the present invention in its mating state;

[0030] Figure 3 yes Figure 2 Enlarged view of A in the middle;

[0031] Figure 4 yes Figure 2 Enlarged view of B in the middle;

[0032] Figure 5 yes Figure 2 A magnified view of C.

[0033] The reference numerals in the figure are as follows: 100, first connector; 110, first external thread; 120, first guide straight tube; 130, guide inclined tube; 131, straight segment; 132, arc segment; 200, metal bellows; 300, second connector; 310, second guide straight tube; 320, limiting straight tube; 321, internal thread; 330, inclined surface; 400, limiting component; 500, sealing ring. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0035] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0036] The metal-coated flexible hose for gas provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0037] Example 1:

[0038] like Figures 1 to 5 As shown, this application provides a metal-coated flexible hose for gas, comprising:

[0039] The first connector 100 has a first external thread 110 on its outer wall and a first guide straight tube 120 and a guide inclined tube 130 that are interconnected inside.

[0040] A metal bellows 200, one end of which is inserted into the first guide straight tube 120 and the guide inclined tube 130;

[0041] The second connector 300 is installed on the outside of the metal bellows 200 and threadedly connected to the first connector 100. Inside it are a second guide straight tube 310 and a limiting straight tube 320 that are interconnected. The inner wall of the limiting straight tube 320 is provided with an internal thread 321, and an inclined surface 330 is provided between the limiting straight tube 320 and the second guide straight tube 310.

[0042] The limiting member 400 is annular and sleeved on the outside of the metal bellows 200 to fill the gap between the metal bellows 200 and the first connecting member 100.

[0043] When the first connector 100 and the second connector 300 are threaded together, the limiting member 400 is deformed under pressure and pressed between the guide tube 130 and the metal bellows 200.

[0044] In some embodiments of this application, such as Figure 1As shown, the aforementioned metal-coated flexible hose for gas utilizes a detachable connection between the first connector 100 and the second connector 300 via a threaded engagement. The threaded connection offers strong self-locking and tightness, resisting external impacts and vibrations and preventing gaps caused by loosening due to impacts and vibrations. Simultaneously, the limiting member 400, annularly sleeved around the metal bellows 200, deforms under pressure during the threaded engagement of the first connector 100 and the second connector 300, filling the gap between the metal bellows 200 and the first connector 100. This prevents gas leakage due to gaps and creates a tight seal through the deformed fit. Furthermore, the pressure-deformed limiting member 400 accommodates assembly errors between the metal bellows 200 and the first connector 100, achieving effective sealing without relying on high-precision machining, reducing assembly difficulty while ensuring sealing reliability.

[0045] Furthermore, in this application, the first guide straight tube 120 and the guide inclined tube 130 inside the first connector 100 are interconnected. The guide straight tube can guide the insertion of the metal bellows 200, ensuring accurate docking of the metal bellows 200 and avoiding misalignment of the sealing surface caused by insertion offset. The guide inclined tube 130 provides adaptation space for the pressure deformation of the limiting member 400, guiding the limiting member 400 to fit in the direction of the metal bellows 200, so that the deformation of the limiting member 400 fits the sealing requirements, further enhancing the sealing effect.

[0046] Example 2:

[0047] This application provides a metal-coated flexible hose for gas, which, in addition to the above-mentioned technical features, also includes the following technical features.

[0048] like Figures 2 to 5 As shown, a sealing ring 500 is also fitted outside the corrugated pipe. One end of the sealing ring 500 contacts the inclined surface 330, and the other end contacts the limiting member 400. The sealing ring 500 is made of rubber.

[0049] In this embodiment, the rubber sealing ring 500 possesses good elasticity. Through its own elastic deformation, it fills the tiny gaps between the sealing ring 500, the inclined surface 330, and the limiting member 400. This, combined with the sealing effect of the limiting member 400, forms a double-sealing structure, improving overall sealing performance and effectively preventing gas leakage. Simultaneously, one end of the sealing ring 500 contacts the inclined surface 330 of the second connecting member 300, and the other end contacts the limiting member 400. The inclined surface 330 can evenly transmit the clamping force of the second connecting member 300 to the sealing ring 500, ensuring the long-term stable function of the sealing ring 500. Furthermore, the rubber material has certain buffering properties, absorbing the impact of external shocks and vibrations on the sealing structure. On the one hand, it reduces the impact of shocks and vibrations on the contact surface between the limiting member 400 and the metal bellows 200; on the other hand, it alleviates the rigid friction between the metal bellows 200 and the connecting member, protecting the integrity of the sealing surface.

[0050] Furthermore, a sealing cavity is formed between the inclined surface 330, the limiting member 400, the guide inclined tube 130, and the sealing ring 500.

[0051] The sealing cavity can prevent external impurities from entering the internal area, avoid impurities from adhering to the sealing surface, prevent impurities from reacting chemically with the sealing components and causing deterioration of the sealing components, and extend the service life of the sealing components.

[0052] Furthermore, the sealing ring 500 is fitted onto the recessed portion of the outer wall of the metal bellows 200.

[0053] The recessed portion on the outer wall of the bellows provides positioning for the sealing ring 500, preventing the sealing ring 500 from being in an insecure position and ensuring that the sealing ring 500 is always in an effective sealing position in contact with the inclined surface 330 and the limiting member 400, thus ensuring the stability of the sealing performance.

[0054] Example 3:

[0055] This application provides a metal-coated flexible hose for gas, which, in addition to the above-mentioned technical features, also includes the following technical features.

[0056] like Figures 2 to 4 As shown, the inner wall of the guide tube 130 includes a straight section 131 and an arc section 132. The inner diameter of the arc section 132 gradually decreases from the straight section 131 to the guide tube. After the limiting member 400 is pressed, its end retracts and fits into the arc section 132.

[0057] In this embodiment, the straight section 131 of the inner wall of the guide tube 130 is used to cooperate with the metal bellows 200. The arc-shaped section 132, through its gradually changing inner diameter design, guides the end of the limiting member 400 to retract inward under pressure. The use of a gradually changing diameter structure makes the deformation of the limiting member 400 smooth and uniform, avoiding cracks or damage to the limiting member 400 due to sudden changes in local stress. At the same time, after the end of the limiting member 400 retracts inward, it fits tightly with the arc-shaped section 132, increasing the contact area between the limiting member 400 and the guide tube 130, and forming a ring-shaped sealing structure, enhancing the sealing performance between the limiting member 400, the guide tube 130, and the metal bellows 200.

[0058] Example 4:

[0059] This application provides a metal-coated flexible hose for gas, which, in addition to the above-mentioned technical features, also includes the following technical features.

[0060] like Figure 4 As shown, the inner diameter of the second guide tube 310 is smaller than the inner diameter of the limiting tube 320, and after the first connector 100 and the second connector 300 are threaded together, the inclined surface 330 presses the sealing ring 500 onto the limiting member 400.

[0061] In this embodiment, the inner diameter of the second guide tube 310 is smaller than the inner diameter of the limiting tube 320, forming a stepped structure. This structure can axially limit the sealing ring 500 and the limiting member 400, preventing the sealing ring 500 from shifting towards the limiting tube 320 during assembly or use. This ensures that the sealing ring 500 is always in an effective sealing position in contact with the inclined surface 330 and the limiting member 400. When the first connector 100 and the second connector 300 are threaded together, the inclined surface 330 presses the sealing ring 500 against the limiting member 400. The axial clamping force generated by the threaded engagement is transmitted to the sealing ring 500 through the inclined surface 330, causing the sealing ring 500 to undergo elastic deformation. This fills the tiny gaps between the sealing ring 500 and the limiting member 400, and between the sealing ring 500 and the bellows, significantly improving sealing reliability.

[0062] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0063] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A metal-coated flexible hose for use with natural gas, characterized in that: include: The first connector (100) has a first external thread (110) on its outer wall and a first guide straight tube (120) and a guide inclined tube (130) that are interconnected inside. A metal bellows (200) has one end inserted into the first guide straight tube (120) and the guide inclined tube (130); The second connector (300) is installed on the outside of the metal bellows (200) and threadedly connected to the first connector (100). Inside it are a second guide tube (310) and a limiting tube (320) that are interconnected. The inner wall of the limiting tube (320) is provided with an internal thread (321), and a slope (330) is provided between the limiting tube (320) and the second guide tube (310). The limiting member (400) is annular and sleeved on the outside of the metal bellows (200) to fill the gap between the metal bellows (200) and the first connector (100); When the first connector (100) and the second connector (300) are threaded together, the limiting member (400) is deformed under pressure and pressed between the guide tube (130) and the metal bellows (200).

2. The metal-coated flexible hose for gas as described in claim 1, characterized in that: The corrugated pipe is also fitted with a sealing ring (500), one end of which contacts the inclined surface (330) and the other end of which contacts the limiting member (400), and the sealing ring (500) is made of rubber.

3. A metal-coated flexible hose for gas as described in claim 1, characterized in that: The inner wall of the guide tube (130) includes a straight section (131) and an arc section (132). The inner diameter of the arc section (132) gradually decreases from the straight section (131) to the guide tube. After the limiting member (400) is pressed, its end retracts and fits into the arc section (132).

4. A metal-coated flexible hose for gas as described in claim 2, characterized in that: The inner diameter of the second guide tube (310) is smaller than the inner diameter of the limiting tube (320), and after the first connector (100) and the second connector (300) are threaded together, the inclined surface (330) presses the sealing ring (500) onto the limiting member (400).

5. A metal-coated flexible hose for gas as described in claim 2, characterized in that: A sealing cavity is formed between the inclined surface (330), the limiting member (400), the guide inclined tube (130), and the sealing ring (500).

6. A metal-coated flexible hose for gas as described in claim 2, characterized in that: The sealing ring (500) is fitted onto the recessed portion of the outer wall of the metal bellows (200).

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