Connector and gas pipe

Abstract

The fuel gas double-layer composite hose comprises a pipeline, a connector and a nut, the pipeline comprises an inner pipe, a corrugated pipe and a flame-retardant layer, the corrugated pipe is arranged on the outer wall of the inner pipe in a sleeving mode, the flame-retardant layer is arranged on the outer wall of the corrugated pipe, the outer wall of the pipeline is slidably connected with a tensioning terminal, and the tensioning terminal is arranged on the outer wall of the corrugated pipe. According to the fuel gas connecting pipe, the inner pipe conveys fuel gas, the stainless steel corrugated pipe is arranged on the outer wall of the inner pipe in a sleeving mode, the material corrosion resistance is high, and corrosive substances in the fuel gas can be resisted; the corrugated pipe manufactured through the hydraulic technology is regular in waveform, good in flexibility, capable of coping with pipeline displacement deformation and enhancing the bending resistance, high in pressure resistance and stable in structure when bearing gas pressure and external action. When the inner pipe is aged and leaks gas, the corrugated pipe can prevent the gas from leaking.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas pipes, and in particular relates to a joint and a gas pipe. Background Art

[0002] In the field of gas transportation, traditional connecting pipes mainly adopt single-layer metal pipes or rubber hose structures, which have obvious technical limitations: metal pipes lack flexibility and are prone to rupture and leakage due to bending and deformation during installation and use; although rubber hoses have certain elasticity, they are prone to aging and cracking, and are not flame retardant; existing connection methods rely on threaded or clamp fastening, which are prone to loosening due to vibration or thermal expansion and contraction after long-term use, resulting in seal failure; at the same time, these traditional structures lack effective anti-corrosion and flame retardant designs, posing safety hazards when encountering open flames or corrosive media, and the installation process is complicated, with high technical requirements for operators, making it difficult to meet the safety, reliability and convenience requirements of modern gas systems. Summary of the Invention

[0003] In order to solve the problems raised in the above-mentioned background technology, the present invention provides the following technical solutions: a double-layer composite hose for gas, comprising a pipe, a joint, and a nut; the pipe comprises an inner pipe, a bellows, and a flame-retardant layer; the bellows is sleeved on the outer wall of the inner pipe; the flame-retardant layer is arranged on the outer wall of the bellows; the outer wall of the pipe is slidably connected with a tensioning terminal; the end of the pipe is clamped between the joint and the tensioning terminal.

[0004] Furthermore, the tensioning terminal is provided with a fitting hole adapted to the pipe, and one end of the tensioning terminal away from the fitting hole is provided with a stop hole adapted to the end of the bellows, and the end of the bellows is located in the stop hole.

[0005] Furthermore, a rubber sleeve is provided in the stop hole, and the rubber sleeve contacts the end portion and the outer wall of the corrugated pipe.

[0006] Furthermore, the flame retardant layer is a plastic layer made of hot-melt PVC.

[0007] Furthermore, the bellows is a stainless steel bellows made by a hydraulic process.

[0008] The beneficial effects of the present invention are as follows: the inner tube of the gas connecting pipe transports gas, and the stainless steel bellows are sleeved on the outer wall of the inner tube. The material is highly corrosion-resistant and can resist corrosive substances in the gas. The bellows, manufactured by hydraulic technology, has a regular waveform and good flexibility, can cope with pipeline displacement and deformation, enhances bending resistance, has strong pressure resistance, and is structurally stable when subjected to gas pressure and external forces. When the inner tube ages and leaks, the bellows can prevent gas leakage. A hot-melt PVC flame-retardant layer is provided on the outer wall of the bellows, which decomposes gases in the event of fire to prevent the spread of flames, and the hot-melt process ensures a tight fit. The tensioning terminal has a fitting hole and a stop hole, and a rubber sleeve in the stop hole forms a sealing structure to prevent gas leakage and protect the bellows. During assembly, the tensioning terminal is sleeved on the outer wall of the inner tube, the rubber sleeve is placed in the stop hole, and the bellows is sleeved on the outer wall of the inner tube and inserted into the stop hole. After connecting the inner tube and the joint, the tensioning terminal is moved to clamp, which is easy to operate and ensures a secure connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A perspective view of the present invention; Figure 2 It is the front view of the present invention; Figure 3 for Figure 2 Schematic diagram of the cross section in the AA direction; Figure 4 Schematic diagram of the structure of the pipeline in the present invention; Figure 5 It is a half-section schematic diagram of the tension terminal in the present invention.

[0010] The meaning of the numbers in the figure are: 1-connector; 2-nut; 3-inner tube; 4-corrugated tube; 5-flame retardant layer; 6-tension terminal; 7-matching hole; 8-stop hole; 9-rubber sleeve. DETAILED DESCRIPTION

[0011] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0012] See also Figure 1-5 The present invention provides the following technical solution: a double-layer composite hose for gas, comprising a pipe, a joint 1, and a nut 2. The pipe comprises an inner pipe 3, a bellows 4, and a flame retardant layer 5. The bellows 4 is sleeved on the outer wall of the inner pipe 3, and the flame retardant layer 5 is arranged on the outer wall of the bellows 4. The outer wall of the pipe is slidably connected with a tightening terminal 6, and the end of the pipe is clamped between the joint 1 and the tightening terminal 6.

[0013] With the above structure, the inner tube 3 transports gas; the bellows 4 is sleeved on the outer wall of the inner tube 3, using flexibility to cope with the displacement and deformation of the pipeline, enhancing the bending resistance and avoiding rupture and leakage; the flame retardant layer 5 is arranged on the outer wall of the bellows 4, which can prevent the spread of flames when encountering open flames and high temperatures, thereby reducing the risk of fire; the tightening terminal 6 is slidably connected to the outer wall of the pipeline, clamping the end of the pipeline to ensure a firm connection and prevent gas leakage.

[0014] In this embodiment, the tensioning terminal 6 is provided with a fitting hole 7 adapted to the pipe, and the end of the tensioning terminal 6 away from the fitting hole 7 is provided with a stop hole 8 adapted to the end of the bellows 4, and the end of the bellows 4 is located in the stop hole 8.

[0015] With the above structure, the fitting hole 7 is adapted to the pipe, ensuring that the tensioning terminal 6 slides stably and fits tightly when clamped; the stop hole 8 is adapted to the end of the bellows 4, limiting the degree of freedom of the bellows 4 and improving the connection stability.

[0016] In this embodiment, a rubber sleeve 9 is provided in the stop hole 8 , and the rubber sleeve 9 contacts the end portion and the outer wall of the corrugated tube 4 .

[0017] With the above structure, the rubber sleeve 9 fills the gap between the stop hole 8 and the bellows 4, forming a sealing structure to prevent gas leakage; at the same time, it plays a buffering and protective role for the bellows 4, reducing damage and extending its service life.

[0018] In this embodiment, the flame retardant layer 5 is a plastic layer made of hot-melt PVC.

[0019] With the above structure, the hot-melt PVC flame-retardant layer 5 has excellent flame-retardant performance and decomposes to produce non-combustible gas to suppress the flame when in fire; it is adhered to the outer wall of the corrugated tube 4 through the hot-melt process to form a continuous and uniform flame-retardant layer 5 with high bonding strength and is not easy to fall off.

[0020] In this embodiment, the bellows 4 is a stainless steel bellows 4 made by a hydraulic process.

[0021] With the above structure, when the inner tube 3 ages and leaks, the bellows 4 can protect the gas connecting pipe from leaking; the stainless steel bellows 4 made by hydraulic process has high strength and strong corrosion resistance, and can resist corrosive substances in the gas. The stainless steel bellows 4 is soft and can be bent at least 20,000 times. It is not easy to crack when bent arbitrarily, and is suitable for use on liquefied gas cylinders and natural gas pipes in residents' homes; the waveform is uniform and regular, with good flexibility and pressure resistance. The structure is stable when subjected to gas pressure and external effects, preventing cracking and deformation.

[0022] Assembly method: Sleeve the tensioning terminal 6 on the outer wall of the inner tube 3, allowing it to slide freely and be installed in the correct direction; place the rubber sleeve 9 in the stop hole 8, sleeve the corrugated tube 4 on the outer wall of the inner tube 3, and insert its end into the stop hole 8 of the tensioning terminal 6 so that it contacts the end and outer wall of the corrugated tube 4; connect the end of the inner tube 3 to the joint 1, and move the tensioning terminal 6 toward the nut 2. At this time, the end of the inner tube 3 is clamped between the joint 1 and the tensioning terminal 6, and the assembly is completed.

[0023] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A double-layer composite gas hose, comprising a pipe, a joint, and a nut, characterized in that: The pipeline includes an inner tube, a corrugated tube, and a flame retardant layer. The corrugated tube is sleeved on the outer wall of the inner tube. The flame retardant layer is arranged on the outer wall of the corrugated tube. The outer wall of the pipeline is slidably connected with a tightening terminal. The end of the pipeline is clamped between the joint and the tightening terminal.

2. A joint and a gas pipe according to claim 1, characterized in that: The tensioning terminal is provided with a fitting hole adapted to the pipe, and one end of the tensioning terminal away from the fitting hole is provided with a stop hole adapted to the end of the corrugated pipe, and the end of the corrugated pipe is located in the stop hole.

3. A joint and a gas pipe according to claim 2, characterized in that: A rubber sleeve is provided in the stop hole, and the rubber sleeve contacts the end portion and the outer wall of the corrugated pipe.

4. The joint and gas pipe according to claim 1, characterized in that: The flame retardant layer is a plastic layer made of hot-melt PVC.

5. The joint and gas pipe according to claim 1, characterized in that: The bellows is a stainless steel bellows made by a hydraulic process.

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