Smoke exhaust pipe

Abstract

The utility model discloses a smoke exhaust pipe which is composed of aluminum foils spirally wound in the length direction of the smoke exhaust pipe, ripples arranged at intervals in the width direction of the aluminum foils are arranged on the aluminum foils in a pressing mode, the edges of the adjacent aluminum foils are in lap joint and meshed together to form a meshing portion, and the surfaces of the aluminum foils are coated with thermoplastic resin layers. The thermoplastic resin layers of two adjacent aluminum foils are attached together, and the two aluminum foils of the seaming part are bonded together through heating and curing. The connector of the smoke exhaust pipe is high in strength, not prone to being snapped and not prone to being punctured.

Description

Technical Field

[0001] The utility model relates to a smoke exhaust pipe and belongs to the technical field of smoke exhaust pipes. Background Art

[0002] In daily life, smoke exhaust pipes are indispensable accessories for home appliances such as water heaters and range hoods. In the prior art, smoke exhaust pipes are mostly made of aluminum foil, stainless steel, and galvanized iron sheets. Among them, aluminum foil pipes are widely used because of their fast heat dissipation, good ductility, and low production cost. However, the aluminum foil pipes are spirally wound and interlocked together. Due to the low structural strength of the interlocking part, problems such as pulling or breaking may occur during use. In addition, the aluminum foil is very thin and easily punctured.

[0003] Chinese patent document CN202915428U discloses a novel range hood exhaust, comprising a spiral tube formed by wrapping aluminum foil on a spiral skeleton, with docking ports at both ends of the spiral tube, and a shaping ring on the inner wall of the docking port. The shaping ring in the patent is attached to the inner wall of the docking port by double-sided adhesive, and the spiral skeleton is formed by winding elastic steel wire.

[0004] Chinese patent document CN220582518U discloses a retractable range hood duct. The aluminum foil tube in the patent is formed by extruding aluminum foil and then spirally winding it. Adjacent aluminum foils are crimped and bitten together, and the strength of the connection structure at the biting part is poor.

[0005] Chinese patent document CN211591591U discloses an aluminum foil veneer for protecting the outer covering of a smoke exhaust pipe, including an aluminum foil fabric, several three-dimensional glass fiber meshes are arranged below the aluminum foil fabric, and a tensile layer formed by several longitudinally oblique bidirectionally spaced and staggered tensile reinforcements intersecting each other is arranged below the three-dimensional glass fiber mesh, and kraft paper is pasted and installed below the tensile layer, and PE adhesive or water-based adhesive is coated and formed below the tensile layer, and kraft paper is pasted and installed below the tensile layer through PE adhesive or water-based adhesive. The aluminum foil veneer structure in this patent is too complicated and the production cost is high. Summary of the invention

[0006] The technical problem to be solved by the utility model is to provide a smoke exhaust pipe which has high interface strength and is not easy to be pulled off or punctured.

[0007] The utility model provides a technical solution to solve the above technical problems: a smoke exhaust pipe, which is composed of an aluminum foil spirally wound along the length direction of the smoke exhaust pipe, the aluminum foil is pressed with corrugations arranged at intervals along the width direction of the aluminum foil, the edges of adjacent aluminum foils are overlapped and bitten together to form a bite portion, the surface of the aluminum foil is coated with a thermoplastic resin layer, the thermoplastic resin layers of two adjacent aluminum foils are bonded together and the two aluminum foils at the bite portion are bonded together by heating and curing.

[0008] In a preferred technical solution, the thermoplastic resin layer is coated on the surface of the aluminum foil facing the smoke exhaust pipe. The thermoplastic resin layer is coated on the outer layer of the aluminum foil. After curing, the thermoplastic resin layer has good impact resistance, high hardness and good anti-pinhole effect.

[0009] A preferred technical solution is that the surface of the aluminum foil is coated with a thermoplastic resin layer. The aluminum foil bite portion is coated with a thermoplastic resin layer, and the thermoplastic resin layers are bonded together and hot-melted and solidified together to increase the connection strength of the bite portion. The entire surface is coated with a thermoplastic resin layer, which can effectively prevent needle puncture.

[0010] A preferred technical solution is that the corrugations on the aluminum foil are arranged at equal intervals in the width direction of the aluminum foil, and the exhaust pipe can be compressed or extended along its length direction through the deformation of the corrugations. The aluminum foil of the exhaust pipe adopts a full corrugation process, which makes ventilation smoother, less noisy, and will not shake when the internal wind speed is high.

[0011] In a preferred technical solution, the thermoplastic resin layer is a polyethylene resin layer. The thermoplastic resin layer can be any hot-melt adhesive resin, such as polyethylene (PE), polypropylene (PP), polystyrene (PS), polyvinyl alcohol (PVA). The composite process of polyethylene and aluminum foil is relatively mature. Polyethylene has strong chemical stability and physical properties, so polyethylene (PE) is preferred, and low-density polyethylene (LDPE), high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE) or ultra-high molecular weight polyethylene can be selected according to needs.

[0012] A preferred technical solution is that the height of the corrugations on the aluminum foil is 2.5 to 5 mm, the width of the corrugations on the aluminum foil is 1 to 2 mm, the width of the aluminum foil is 10 to 20 mm, the thickness of the aluminum foil is 0.07 to 0.12 mm, the thickness of the thermoplastic resin layer is 0.01 to 0.04 mm, and the weight of the aluminum foil coated with the thermoplastic resin layer is 150 to 350 g / m 2 .

[0013] A preferred technical solution is that the end of the smoke exhaust pipe is provided with an annular joint crimped outside the aluminum foil and an inner ring crimped inside the aluminum foil, and the aluminum foil at the end of the smoke exhaust pipe is clamped and fixed between the annular joint and the inner ring.

[0014] A preferred technical solution is that the width of the inner ring is smaller than the width of the annular joint, one end of the annular joint extends out of the aluminum foil, and the inner ring is located inside the aluminum foil.

[0015] A preferred technical solution is that the above-mentioned bite portion is formed by folding the edges of two pieces of aluminum foil around each other, and the parts of the two pieces of aluminum foil biting together in the bite portion are adhered to each other through corresponding thermoplastic resin layers and heat-melted and solidified together.

[0016] A preferred technical solution is that the above-mentioned bite portion is formed by folding the edges of two pieces of aluminum foil around each other at least once, the middle part of the bite portion is squeezed into a recessed portion, and the two sides of the recessed portion are gathered inwardly.

[0017] The utility model has positive effects:

[0018] (1) The smoke exhaust pipe of the utility model is coated with a thermoplastic resin layer on the outer surface of the aluminum foil. When the finished product is made, the thermoplastic resin layer is solidified through a suitable process, so that the two pieces of aluminum foil are firmly connected together and cannot be torn apart by hand, and the tensile strength of the bite is significantly improved. At the same time, the cured thermoplastic resin layer also increases the anti-needle puncture ability of the smoke exhaust pipe, making it not easy to be punctured, thereby improving the sealing and durability of the smoke exhaust pipe.

[0019] (2) The smoke exhaust pipe of the utility model can be provided with an annular joint and an inner ring at one end or both ends of the smoke exhaust pipe. The annular joint is pressed inwards and the inner ring is supported outwards. The annular joint and the inner ring are interference fit to be fixed on the smoke exhaust pipe. The assembly process is convenient, the fixation is firm, and the sealing is good. The smoke exhaust pipe with an annular joint is more convenient to install.

[0020] (3) The bite portion of the smoke exhaust pipe of the utility model adopts a double-buckle pressing technology, that is, the edges of the two pieces of aluminum foil are folded around each other and bite together, and then a depression is squeezed out in the middle of the bite portion by a pressing wheel, so that the aluminum foil of the bite portion is folded together in multiple layers, which effectively improves the connection strength of the bite portion, so that even if the aluminum foil of the smoke exhaust pipe is torn, the bite portion will not loosen.

[0021] (4) The aluminum foil of the smoke exhaust pipe of the utility model adopts a full corrugated process, which makes ventilation smoother, reduces noise, and does not vibrate when the internal wind speed is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The smoke exhaust pipe of the utility model is further described below in conjunction with the accompanying drawings.

[0023] Figure 1 is a schematic diagram of the three-dimensional structure of the smoke exhaust pipe of Example 1;

[0024] Figure 2 It is a cross-sectional schematic diagram of the annular joint and the inner ring of the smoke exhaust pipe of Example 1;

[0025] Figure 3 for Figure 2 Schematic diagram of the cross section of the bite portion of the middle exhaust pipe.

[0026] The above-mentioned reference numerals are as follows:

[0027] Aluminum foil 1, bite portion 11, recessed portion 12, annular joint 2, inner ring 3. DETAILED DESCRIPTION

[0028] Example 1, see Figures 1 to 3 The smoke exhaust pipe of this embodiment is composed of an aluminum foil 1 spirally wound along the length direction of the smoke exhaust pipe. The aluminum foil 1 is provided with corrugations arranged at intervals along the width direction of the aluminum foil 1. The edges of adjacent aluminum foils 1 are overlapped and bitten together to form a bite portion 11. The surface of the aluminum foil 1 facing the outside of the smoke exhaust pipe is completely coated with a thermoplastic resin layer, which is a polyethylene resin layer. The thermoplastic resin layers of two adjacent aluminum foils 1 are bonded together and the two aluminum foils 1 in the bite portion 11 are bonded together by hot melt curing.

[0029] The height of the corrugation on the aluminum foil 1 is 3 mm, the width of the corrugation on the aluminum foil 1 is 2 mm, the width of the aluminum foil 1 is 15 mm, the thickness of the aluminum foil 1 is 0.08 mm, the thickness of the thermoplastic resin layer is 0.02 mm, and the weight of the aluminum foil 1 coated with the thermoplastic resin layer is 250 g / m 2 .

[0030] See Figure 1 and Figure 2 The end of the smoke exhaust pipe is provided with a ring joint 2 crimped outside the aluminum foil 1 and an inner ring 3 crimped inside the aluminum foil 1, and the aluminum foil 1 at the end of the smoke exhaust pipe is clamped and fixed between the ring joint 2 and the inner ring 3. The width of the inner ring 3 is smaller than the width of the ring joint 2, one end of the ring joint 2 extends out of the aluminum foil 1, and the inner ring 3 is located inside the aluminum foil 1.

[0031] See Figure 3 The bite portion 11 is formed by folding the edges of two aluminum foils 1 around each other at least once, and the middle of the bite portion 11 is squeezed into a recessed portion 12, and the two sides of the recessed portion 12 are gathered inward.

[0032] When manufacturing the smoke exhaust pipe of this embodiment, a roll of aluminum foil 1 is conveyed forward under the action of the guide assembly and the straightening assembly. After being soaked in the processing liquid tank, the aluminum foil 1 is pressed into corrugations by rollers arranged side by side, and then rolled into a hollow spiral tube under the action of the spiral forming assembly (refer to patent documents CN1266387A and CN110899366B). The adjacent edges of the aluminum foil are overlapped and bite together under the action of the bite assembly (refer to the lock seam in patent document CN1266387A) to form a bite portion to make a smoke exhaust pipe. After the smoke exhaust pipe reaches a certain length, it is cut off by the cutting device, and the baffles at both ends of the hollow spiral tube move toward each other, compressing the smoke exhaust pipe along its length direction through the deformation of the corrugations. Before or after compression, the smoke exhaust pipe is heated to make the thermoplastic resin layers that are bonded together at the bite portion melt and solidify together. The end of the smoke exhaust pipe can be covered with an annular joint 2 and embedded with an inner ring 3. The annular joint 2 is pressed inwardly and the inner ring 3 is pressed outwardly to form an interference fit, and the aluminum foil 1 is clamped and fixed between the annular joint 2 and the inner ring 3.

[0033] Embodiment 2: The smoke exhaust pipe of this embodiment is the same as that of Embodiment 1 in other parts, except that: there is no annular joint 2 and inner ring 3.

[0034] Embodiment 3: The smoke exhaust pipe of this embodiment is the same as that of Embodiment 1 in other parts, except that the thermoplastic resin layer is only coated on the two side edges of the aluminum foil 1 facing the outside of the smoke exhaust pipe.

[0035] Embodiment 4, the smoke exhaust pipe of this embodiment is the same as that of Embodiment 1 in other parts, except that: the bite portion 11 is formed by folding the edges of two pieces of aluminum foil 1 around each other, and the middle portion is not squeezed into a recessed portion 12.

[0036] Obviously, the above embodiments are merely examples for clearly illustrating the embodiments of the present invention, and are not intended to limit the embodiments of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. However, these obvious changes or modifications derived from the spirit of the present invention are still within the scope of protection of the present invention.

Claims

1. A smoke exhaust pipe, comprising an aluminum foil (1) spirally wound along the length direction of the smoke exhaust pipe, the aluminum foil (1) being provided with corrugations arranged at intervals along the width direction of the aluminum foil (1), the edges of adjacent aluminum foils (1) being overlapped and bitten together to form a biting portion (11), characterized in that: The surface of the aluminum foil (1) is coated with a thermoplastic resin layer, the thermoplastic resin layers of two adjacent aluminum foils (1) are bonded together, and the two aluminum foils (1) at the bite portion (11) are bonded together by hot melt curing.

2. A smoke exhaust pipe according to claim 1, characterized in that: The thermoplastic resin layer is coated on the surface of the aluminum foil (1) facing the outside of the smoke exhaust pipe.

3. A smoke exhaust pipe according to claim 2, characterized in that: The entire surface of the aluminum foil (1) is coated with a thermoplastic resin layer.

4. A smoke exhaust pipe according to claim 1, characterized in that: The corrugations on the aluminum foil (1) are arranged at equal intervals in the width direction of the aluminum foil (1), and the smoke exhaust pipe can be compressed or extended along its length direction through the deformation of the corrugations.

5. The smoke exhaust pipe according to claim 1, characterized in that: The thermoplastic resin layer is a polyethylene resin layer.

6. The smoke exhaust pipe according to claim 1, characterized in that: The height of the corrugations on the aluminum foil (1) is 2.5 to 5 mm, the width of the corrugations on the aluminum foil (1) is 1 to 2 mm, the width of the aluminum foil (1) is 10 to 20 mm, the thickness of the aluminum foil (1) is 0.07 to 0.12 mm, the thickness of the thermoplastic resin layer is 0.01 to 0.04 mm, and the gram weight of the aluminum foil (1) coated with the thermoplastic resin layer is 150 to 350 g / m 2 .

7. A smoke exhaust pipe according to any one of claims 1 to 6, characterized in that: The end of the smoke exhaust pipe is provided with an annular joint (2) crimped outside the aluminum foil (1) and an inner ring (3) crimped inside the aluminum foil (1), and the aluminum foil (1) at the end of the smoke exhaust pipe is clamped and fixed between the annular joint (2) and the inner ring (3).

8. The smoke exhaust pipe according to claim 7, characterized in that: The width of the inner ring (3) is smaller than the width of the annular joint (2); one end of the annular joint (2) extends out of the aluminum foil (1); and the inner ring (3) is located inside the aluminum foil (1).

9. A smoke exhaust pipe according to any one of claims 1 to 6, characterized in that: The bite portion (11) is formed by folding the edges of two pieces of aluminum foil (1) around each other, and the bite portions of the two pieces of aluminum foil (1) of the bite portion (11) are bonded to each other through corresponding thermoplastic resin layers and are thermally melted and solidified together.

10. A smoke exhaust pipe according to claim 9, characterized in that: The bite portion (11) is formed by folding the edges of two pieces of aluminum foil (1) around each other at least once, the middle of the bite portion (11) is squeezed into a recessed portion (12), and the two sides of the recessed portion (12) are gathered inwardly.

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