Fastening-free gas hose

Abstract

The utility model relates to a buckling-free gas hose, and belongs to the technical field of hoses specially suitable for metal manufacturing. The gas hose comprises a corrugated pipe, a fixing ring and connecting pipes fixed to the two ends of the corrugated pipe. The corrugated pipe is sleeved with a net sleeve, and the net sleeve is sleeved with a protective sleeve. The two ends of the protective sleeve are sleeved with the fixing rings. The two ends of the corrugated pipe are extruded to form a dense wave section containing at least two closely attached wave crests; the end, connected with the corrugated pipe, of the connecting pipe forms a reducing step, the inner ring of the dense-wave section is tightly attached to the outer ring face of the step, and the outer end face of the dense-wave section is tightly attached to the vertical face of the step. The surface of the connecting pipe and the end faces of the fixing ring and the net cover form an annular weld joint, and the fixing ring, the net cover, the corrugated pipe and the connecting pipe are welded into a whole. Compared with a traditional gas hose, the gas hose has the advantages that one-time welding is carried out in a buckling-free mode, local stress concentration caused by repeated buckling and welding is avoided, and the connecting stability and sealing performance of the gas hose and the connecting pipe are improved.

Description

Technical Field

[0001] This utility model relates to a pressure-free gas hose, belonging to the technical field of hoses (F16L33 / 26) specifically designed for metal manufacturing. Background Technology

[0002] In recent years, stainless steel gas hoses have been gradually replacing traditional rubber hoses in gas safety renovation projects in various large and medium-sized cities due to their numerous advantages such as safety, reliability, and long service life. Among them, ultra-flexible stainless steel gas hoses are widely popular because they can be used with both mobile and stationary gas appliances or gas equipment.

[0003] However, due to its design, the existing gas hoses inevitably require two crimping and two welding processes during the manufacturing process to fix the protective layer of the hose to the internal corrugated pipe. Such a complicated production process increases the probability of local stress concentration in the pipe body and leakage problems, seriously affecting the safety and reliability of the gas hose. Utility Model Content

[0004] The technical problem this invention aims to solve is: how to improve the sealing performance of gas hoses while reducing the number of welding and crimping operations.

[0005] The technical solution proposed by this utility model to solve the above-mentioned technical problems is as follows: a pressure-free gas hose, comprising a corrugated pipe, a fixing ring, and connecting pipes fixed to both ends of the corrugated pipe; the corrugated pipe is covered with a mesh sleeve, and the mesh sleeve is covered with a protective sleeve; the fixing ring is fitted at both ends of the protective sleeve; the two ends of the corrugated pipe are squeezed to form a dense corrugated segment containing at least two closely fitting crests; the end of the connecting pipe connected to the corrugated pipe forms a reduced-diameter step, the inner ring of the dense corrugated segment is tightly attached to the outer ring surface of the step, and the outer end face of the dense corrugated segment is tightly attached to the vertical surface of the step; the surface of the connecting pipe forms an annular weld with the end faces of the fixing ring and the mesh sleeve, and the fixing ring, the mesh sleeve, the corrugated pipe, and the connecting pipe are welded together as a whole.

[0006] Furthermore, the other end of the connector is provided with a protrusion and a nut, one end of the nut is screwed to the other end of the connector, and the other end of the nut is radially contracted inward and engages with the protrusion for limiting; a washer is provided between the nut and the protrusion.

[0007] Furthermore, the protective sleeve and gasket are made of rubber.

[0008] The beneficial effects of this invention are as follows: Because the corrugated pipe is compressed at both ends to form a dense corrugated section containing at least two tightly fitted crests, and a reduced-diameter step is formed at the end where the connector connects to the corrugated pipe, the inner ring of the dense corrugated section is tightly attached to the outer ring surface of the step, and the outer end face of the dense corrugated section is tightly attached to the vertical surface of the step. Furthermore, an annular weld is formed between the surface of the connector and the end faces of the fixing ring and the mesh sleeve, thus welding the fixing ring, mesh sleeve, corrugated pipe, and connector together as a single unit. Compared to traditional gas hoses, this single-welding method, without the need for crimping, avoids leakage problems caused by localized stress concentration resulting from multiple crimping and welding, greatly improving the connection stability and sealing performance between the gas hose and the connector. Attached Figure Description

[0009] The following description, in conjunction with the accompanying drawings, further illustrates a pressure-free gas hose according to this utility model.

[0010] Figure 1 This is a schematic diagram of the overall structure of the pressure-free gas hose in the embodiment.

[0011] Figure 2 This is a schematic diagram of the internal structure of the pressure-free gas hose in the embodiment.

[0012] Figure 3 yes Figure 2 Enlarged view of point A.

[0013] In the diagram: 1. Corrugated pipe; 2. Fixing ring; 3. Connecting pipe; 4. Mesh sleeve; 5. Protective sleeve; 6. Dense band; 7. Step; 8. Protrusion; 9. Nut; 10. Washer; 11. Weld. Detailed Implementation

[0014] Example

[0015] The pressure-free gas hose in this embodiment is as follows: Figure 1 and Figure 2 As shown, it includes a corrugated pipe 1, a retaining ring 2, and connecting pipes 3 fixed to both ends of the corrugated pipe; a mesh sleeve 4 is fitted over the corrugated pipe 1, and a protective sleeve 5 is fitted over the mesh sleeve 4; the protective sleeve 5 is made of rubber; the retaining ring 2 is fitted onto both ends of the protective sleeve 5; as shown... Figure 3 As shown, after the bellows 1 is compressed at both ends, it forms two closely fitting dense corrugated sections 6. The end of the connector 3 connected to the bellows 1 forms a reduced-diameter step 7. The inner ring of the dense corrugated section 6 is tightly attached to the outer ring surface of the step 7, and the outer end face of the dense corrugated section 6 is tightly attached to the vertical surface of the step 7. The surface of the connector 3 forms an annular weld 11 with the end faces of the fixing ring 2 and the mesh sleeve 4, welding the fixing ring 2, mesh sleeve 4, bellows 1, and connector 3 together as one unit. Since the welding structures at both ends of the connector 2 are identical, Figure 3 Showing only one end is sufficient.

[0016] At the other end of the connecting pipe 3, which is not connected to the bellows 1, there is a protrusion 8 and a nut 9. One end of the nut is screwed onto the other end of the connecting pipe 3, and the other end of the nut radially contracts inward to wrap around the protrusion to achieve a limiting fit. A washer 10, made of rubber, is provided between the screwed end of the nut 9 and the protrusion 8. When actually connecting the gas stove, as the nut 9 is continuously tightened, the washer 10 is compressed, enhancing the connection seal.

[0017] This utility model is not limited to the above embodiments. All technical solutions formed by equivalent substitutions fall within the protection scope claimed by this utility model.

Claims

1. A non-pressing type gas hose, comprising a corrugated pipe, a fixing ring and a connector fixed at both ends of the corrugated pipe; a mesh cover is provided on the corrugated pipe, and a protective cover is provided on the mesh cover; the fixing ring is sleeved at both ends of the protective cover; characterized in that The corrugated pipe is compressed at both ends to form a dense corrugated section containing at least two closely fitting crests; the end of the connecting pipe connected to the corrugated pipe forms a reduced-diameter step, the inner ring of the dense corrugated section is tightly attached to the outer ring surface of the step, and the outer end face of the dense corrugated section is tightly attached to the vertical surface of the step; the surface of the connecting pipe forms an annular weld with the end faces of the fixing ring and the mesh sleeve, and the fixing ring, the mesh sleeve, the corrugated pipe and the connecting pipe are welded together as one unit.

2. The no- crimp gas hose according to claim 1, characterized in that: The other end of the connector is provided with a protrusion and a nut. One end of the nut is screwed to the other end of the connector, and the other end of the nut is radially contracted inward and engages with the protrusion for limiting. A washer is provided between the nut and the protrusion.

3. The no-bra gas hose according to claim 1, wherein: The protective sleeve and gasket are made of rubber.

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