Teflon lining ventilating duct
By adopting the Teflon lining design in the ventilation duct, combined with the stainless steel cylinder, thermal insulation layer and protective mechanism, the problem of insufficient strength and corrosion resistance of the ventilation duct in high-temperature and high-corrosion environments is solved, which improves durability and adaptability, and reduces safety hazards and economic losses.
Patent Information
- Application Number
- CN202422588919.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-10-25
AI Technical Summary
It is difficult for existing ventilation ducts to take into account high strength and good corrosion resistance in high temperature and corrosive environments, resulting in a shortened service life and an increase in maintenance costs, limiting their application range in actual projects.
The Teflon lining ventilation duct design is adopted, including the stainless steel cylinder inner wall coated with adhesive, internal insulation layer and Teflon film, and the outer protective mechanism is equipped with a rotating ring, inner and outer protective sleeve, fixing plate and threaded rod to form a multi-layer composite structure.
It significantly improves the durability of ventilation ducts in high temperature, high humidity and strong corrosive environments, reduces safety hazards and economic losses caused by material failure, avoids the risk of stress concentration damage caused by thermal expansion mismatch, adapts to pipes of different sizes and can cope with harsh operating conditions.
Smart Images
Figure CN223216012U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ventilation ducts, in particular to a Teflon-lined ventilation duct. Background Art
[0002] The air duct is a piping system used for air transportation and distribution. There are two types of air ducts: composite air ducts and inorganic air ducts. They can be classified according to cross-sectional shape and material. The production of stainless steel air ducts is to apply sealant (such as neutral glass glue) on the gaps such as the bite seams, rivet seams, and the four corners of the flange.
[0003] The ventilation ducts currently used in the market are mainly divided into two categories: metal and non-metal. Metal ventilation ducts have been widely used in many occasions due to their high strength and good pressure resistance. However, in the face of high temperature and highly corrosive working environments, metal ventilation ducts are prone to problems such as oxidation corrosion, which leads to reduced service life and increased maintenance costs. Although non-metal ventilation ducts have advantages in corrosion resistance, they are often prone to softening and deformation under high temperature conditions, especially under continuous high temperature conditions, and the material stability is difficult to guarantee.
[0004] In order to overcome these shortcomings, there are two common practices: one is to improve the corrosion resistance of metal pipes through surface treatment, but this not only increases the manufacturing cost, but also has limited protection effect under extreme conditions; the other is to use high-temperature resistant plastics or composite materials as pipe materials. Although such materials can alleviate the above problems to a certain extent, due to their own physical properties, they will still age and deteriorate in long-term high-temperature environments. These two methods cannot fundamentally solve the problem, and both have certain limitations and shortcomings. They cannot take into account the requirements of high strength and good corrosion resistance. Especially when the operating temperature exceeds a certain limit, the ventilation ducts will face the risk of failure, which greatly limits their application scope and development potential in actual engineering. Utility Model Content
[0005] In response to the shortcomings of the existing technology, the utility model provides a Teflon-lined ventilation duct with advantages such as improved durability, which solves the problem of being unable to take into account both high strength and good corrosion resistance. In particular, when the operating temperature exceeds a certain limit, the ventilation duct will face the risk of failure, which greatly limits their application scope and development potential in actual engineering.
[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a Teflon-lined ventilation duct, comprising a stainless steel cylinder, the inner wall of which is coated with an adhesive, the inner cavity of which is provided with a heat-insulating layer, the inner cavity of which is provided with a Teflon film, and the outer surface of which is provided with a protective mechanism for improving the protective performance of the ventilation duct;
[0007] The protective mechanism includes two rotating rings, two inner protective sleeves, an outer protective sleeve, four fixed plates and four threaded rods. The two rotating rings are threadedly connected to the left and right ends of the outer surface of the stainless steel cylinder, and the two inner protective sleeves are fixed to the rotating rings on their opposite sides. The outer protective sleeve is arranged on the outer surface of the inner protective sleeve, and the left and right ends of the inner cavity of the outer protective sleeve are provided with sliding grooves. The upper and lower sides of the inner protective sleeve are provided with multiple threaded grooves. The four fixed plates are respectively provided at the left and right ends of the upper and lower sides of the outer protective sleeve. The threaded rods and the fixed plates are rotatably connected by bearings, and the left and right ends of the upper and lower sides of the outer protective sleeve are provided with threaded holes.
[0008] By adopting this technical solution, the durability of ventilation ducts in high temperature, high humidity and highly corrosive environments has been significantly improved, and the safety hazards caused by material failure and the economic losses caused by frequent replacement have been greatly reduced. The unique multi-layer combination structure effectively isolates the heat conduction path and avoids the risk of stress concentration damage caused by thermal expansion mismatch that is common in traditional single-material structures.
[0009] Furthermore, the shape of the stainless steel cylinder is a hollow cylinder, and both left and right ends of the outer surface of the stainless steel cylinder are provided with external threads, and the adhesive is Loctite EA high temperature resistant epoxy resin glue.
[0010] Furthermore, the heat insulation layer is filled with glass fiber, and the thickness of the Teflon film is about 0.2 mm.
[0011] By adopting this technical solution, heat is transferred through the Teflon film to the middle interlayer area and absorbed and diffused by the glass fiber, greatly reducing the impact on the outer wall metal components. The Teflon film can effectively resist erosion damage caused by external media while reducing flow resistance loss.
[0012] Furthermore, the outer diameter of the inner protective sleeve is adapted to the inner diameter of the slide groove, and the inner protective sleeve performs horizontal linear motion in the inner cavity of the outer protective sleeve.
[0013] By adopting this technical solution, it can adapt to pipelines of different sizes, thereby improving applicability.
[0014] Furthermore, two accommodating grooves are provided on the left and right ends of the upper and lower sides of the outer protective sleeve, and telescopic sleeve rods are fixed on the left and right ends between the accommodating grooves and the opposite side of the fixed plate. The two accommodating grooves are located on the left and right sides of the vertical central axis of the threaded rod.
[0015] By adopting this technical solution, the provided telescopic sleeve rod can limit the movement of the fixed plate.
[0016] Furthermore, the inner diameters of the thread groove and the threaded hole are both adapted to the outer diameter of the threaded rod.
[0017] Furthermore, the plurality of thread grooves are evenly distributed on the upper and lower sides of the inner protective sleeve, and the thread grooves are threadedly connected to the thread grooves and the threaded holes.
[0018] Furthermore, the inner diameter of the inner protective sleeve is adapted to the outer diameter of the stainless steel cylinder, and the outer diameter of the rotating ring is larger than the outer diameter of the outer protective sleeve.
[0019] By adopting this technical solution, the purpose of supporting the stainless steel cylinder is achieved.
[0020] Compared with the existing technology, the technical solution of this application has the following beneficial effects:
[0021] 1. The Teflon-lined ventilation duct significantly improves the durability of the ventilation duct in high temperature, high humidity and highly corrosive environments, greatly reducing the safety hazards caused by material failure and the economic losses caused by frequent replacement. The unique multi-layer combination structure effectively isolates the heat conduction path and avoids the risk of stress concentration damage caused by thermal expansion mismatch that is common in traditional single-material structures.
[0022] 2. The Teflon-lined ventilation duct uses the outer protective sleeve as the second line of defense to prevent leakage accidents and enable rapid emergency measures to stop the leakage. It can adapt to pipes of different sizes, so that it can adapt to special workplaces and more stringent operating conditions such as extremely high negative pressure or acid-base alternating shock, greatly improving the protection. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 This is a schematic diagram of the structure of the utility model;
[0024] Figure 2 This is a schematic diagram of the protective mechanism structure of the utility model;
[0025] Figure 3 This is a 3D structural diagram of the stainless steel cylinder and part of the protective mechanism of the utility model.
[0026] In the figure: 1. Stainless steel cylinder; 2. Adhesive; 3. Insulation layer; 4. Teflon film; 5. Protective mechanism; 51. Rotating ring; 52. Inner protective sleeve; 53. Outer protective sleeve; 54. Fixed plate; 55. Threaded rod; 56. Slide groove; 57. Threaded groove; 58. Threaded hole. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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.
[0028] See also Figure 1 In this embodiment, a Teflon-lined ventilation duct includes a stainless steel cylinder 1, the inner wall of the stainless steel cylinder 1 is coated with an adhesive 2, the inner cavity of the adhesive 2 is provided with an insulation layer 3, the inner cavity of the insulation layer 3 is provided with a Teflon film 4, and the outer surface of the stainless steel cylinder 1 is provided with a protective mechanism 5 for improving the protective performance of the ventilation duct.
[0029] In this embodiment, the stainless steel cylinder 1 is shaped like a hollow cylinder. The left and right ends of the outer surface of the stainless steel cylinder 1 are provided with external threads. The wall thickness of the stainless steel cylinder 1 is 5 mm, and the length is customized according to actual needs. The stainless steel cylinder 1 is made of standard 304L steel and has good weather resistance and welding performance. The adhesive 2 is Loctite EA9388 high-temperature resistant epoxy resin glue, which can withstand continuous temperature changes from -60°C to +260°C without failure after curing. The insulation layer 3 is glass fiber filler, and the thickness of the glass fiber filler is not less than 10 mm. The glass fiber is selected from high-quality chopped yarn produced in Changzhou, Jiangsu, with a diameter of about 10 μm, and has the characteristics of high elastic modulus and low thermal conductivity. The thickness of the Teflon film 4 is about 0.2 mm, and the Teflon film 4 uses imported DuPont brand Teflon PTFE material, which has the advantages of excellent chemical stability and low friction coefficient.
[0030] It should be noted that, during operation, the high-temperature gas flowing through the ventilation duct first contacts the innermost Teflon film 4. Since the Teflon film 4 itself has excellent temperature resistance and non-stick characteristics, it can effectively resist erosion damage caused by external media while reducing flow resistance loss. Subsequently, the heat is transferred to the middle interlayer area through the Teflon film 4 and is absorbed and diffused by the glass fiber, which greatly reduces the impact on the stainless steel cylinder 1.
[0031] It is understandable that since the entire structure adopts a multi-layer composite design, even if a single component is damaged, the overall functional integrity of the system can still be maintained through the normal operation of other parts; if for cost considerations or other factors, the Teflon film 4 can also be replaced by a domestically produced polytetrafluoroethylene sheet of similar quality, and the glass fiber filling can be adjusted to similar mineral wool products of other forms and specifications according to procurement conditions. As long as the basic thermal insulation performance indicators remain unchanged, they can be interchangeable.
[0032] See also Figures 2 to 3 In order to improve the protection, the protection mechanism 5 in this embodiment includes two rotating rings 51, two inner protective sleeves 52, an outer protective sleeve 53, four fixing plates 54 and four threaded rods 55. The two rotating rings 51 are threadedly connected to the left and right ends of the outer surface of the stainless steel cylinder 1. The opposite sides of the two inner protective sleeves 52 are fixed to the rotating rings 51. The outer protective sleeves 53 are arranged on the outer surface of the inner protective sleeves 52. The left and right ends of the inner cavity of the outer protective sleeve 53 are provided with sliding grooves 56. By screwing one end of the rotating ring 51 from one side of the stainless steel cylinder 1, the two inner protective sleeves 52 can be moved toward the side close to the vertical central axis of the outer protective sleeve 53, so that the two inner protective sleeves 52 can move relative to each other in the inner cavity of the sliding groove 56.
[0033] A plurality of threaded grooves 57 are provided on the upper and lower sides of the inner protective sleeve 52, and four fixed plates 54 are respectively provided on the left and right ends of the upper and lower sides of the outer protective sleeve 53. The threaded rod 55 is rotatably connected to the fixed plate 54 through a bearing. The left and right ends of the upper and lower sides of the outer protective sleeve 53 are provided with threaded holes 58 until the two rotating rings 51 are threadedly connected to the left and right ends of the outer surface of the stainless steel cylinder 1. The threaded rod 55 is rotated, and the rotation of the threaded rod 55 drives the fixed plate 54 to move downward under the limit of the two limit sleeve rods until the threaded rod 55 moves into the inner cavity of the threaded hole 58 and the threaded groove 57 in turn, so as to locate the position of the inner protective sleeve 52.
[0034] Among them, the outer diameter of the inner protective sleeve 52 is adapted to the inner diameter of the slide groove 56, and the inner protective sleeve 52 performs horizontal linear motion in the inner cavity of the outer protective sleeve 53. Two accommodating grooves are provided on the left and right ends of the upper and lower sides of the outer protective sleeve 53. Telescopic sleeve rods are fixed on the left and right ends between the accommodating groove and the opposite side of the fixed plate 54. The two accommodating grooves are located on the left and right sides of the vertical central axis of the threaded rod 55.
[0035] In this embodiment, the inner diameters of the thread groove 57 and the threaded hole 58 are adapted to the outer diameter of the threaded rod 55, and multiple thread grooves 57 are evenly distributed on the upper and lower sides of the inner protective sleeve 52. The thread grooves 57 and the threaded holes 58 are threadedly connected, and the inner diameter of the inner protective sleeve 52 is adapted to the outer diameter of the stainless steel cylinder 1. The outer diameter of the rotating ring 51 is larger than the outer diameter of the outer protective sleeve 53.
[0036] It should be noted that the outer protective sleeve 53 is used as a second line of defense to prevent leakage accidents so that emergency measures can be taken quickly to stop the leakage and stop the loss. It can adapt to pipes of different sizes, so that it can adapt to special workplaces and more stringent operating conditions such as extremely high negative pressure or acid-base alternating shock situations, greatly improving the protection.
[0037] In addition, the inner protective sleeve 52 and the outer protective sleeve 53 are both carbon steel protective sleeves.
[0038] The working principle of the above embodiment is:
[0039] (1) When installing, first clean and dry the stainless steel cylinder 1 to be processed, cut a Teflon film 4 of appropriate size and place it on the prepared stainless steel cylinder 1 for later use, and then evenly apply a thin layer of Loctite EA on the inner wall of the stainless steel cylinder 1. 9388 adhesive until all contact areas are completely covered, and then fine glass fiber particles are evenly spread on the surface of the adhesive, and then the pre-treated Teflon film 4 is evenly laid into the inner cavity of the stainless steel cylinder 1, and gently pressed with the hand to make sure that there is no air residue between the two. Turn on the compressor equipment and adjust the appropriate air source pressure value, then slowly pass it into the sealed container until the Teflon film 4 is tightened and shaped. Do not move objects at will before ensuring that the adhesive material is completely cured and hardened to avoid dislocation. When working, the high-temperature gas flowing through the ventilation duct first contacts the innermost Teflon film 4. Since the Teflon film 4 material itself has excellent temperature resistance and non-stick characteristics, it can effectively resist erosion and damage caused by external media while reducing flow resistance loss. Then the heat is transferred to the middle interlayer area through the Teflon film 4 and is absorbed and diffused by the glass fiber, which greatly reduces the impact on the stainless steel cylinder 1.
[0040] (2) In order to adapt to the different lengths of the stainless steel cylinder 1, one end of the rotating ring 51 can be screwed into the stainless steel cylinder 1 from one side, and the two inner protective sleeves 52 can be moved to the side close to the vertical center axis of the outer protective sleeve 53, so that the two inner protective sleeves 52 can move relative to each other in the inner cavity of the slide groove 56 until the two rotating rings 51 are threadedly connected to the left and right ends of the outer surface of the stainless steel cylinder 1, and the threaded rod 55 is rotated. The rotation of the threaded rod 55 drives the fixed plate 54 to move downward under the limit of the two limit sleeve rods until the threaded rod 55 moves into the inner cavity of the threaded hole 58 and the threaded groove 57 in turn, so that the position of the inner protective sleeve 52 can be positioned.
Claims
1. A Teflon-lined ventilation duct, comprising a stainless steel cylinder (1), characterized in that: The inner wall of the stainless steel cylinder (1) is coated with an adhesive (2), the inner cavity of the adhesive (2) is provided with a heat insulation layer (3), the inner cavity of the heat insulation layer (3) is provided with a Teflon film (4), and the outer surface of the stainless steel cylinder (1) is provided with a protective mechanism (5) for improving the protective performance of the ventilation duct; The protective mechanism (5) comprises two rotating rings (51), two inner protective sleeves (52), an outer protective sleeve (53), four fixed plates (54) and four threaded rods (55). The two rotating rings (51) are threadedly connected to the left and right ends of the outer surface of the stainless steel cylinder (1). The two inner protective sleeves (52) are fixed to the rotating rings (51) on opposite sides. The outer protective sleeve (53) is provided on the outer surface of the inner protective sleeve (52). The left and right ends of the inner cavity of the outer protective sleeve (53) are provided with sliding grooves (56). The upper and lower sides of the inner protective sleeve (52) are provided with multiple threaded grooves (57). The four fixed plates (54) are respectively provided at the left and right ends of the upper and lower sides of the outer protective sleeve (53). The threaded rods (55) and the fixed plates (54) are rotatably connected through bearings. The left and right ends of the upper and lower sides of the outer protective sleeve (53) are provided with threaded holes (58).
2. The Teflon-lined ventilation duct according to claim 1, characterized in that: The stainless steel cylinder (1) is in the shape of a hollow cylinder. External threads are provided at the left and right ends of the outer surface of the stainless steel cylinder (1). The adhesive (2) is Loctite EA 9388 high-temperature resistant epoxy resin glue.
3. The Teflon-lined ventilation duct according to claim 1, characterized in that: The heat insulation layer (3) is a glass fiber filler, and the Teflon film (4) has a thickness of approximately 0.2 mm.
4. The Teflon-lined ventilation duct according to claim 1, characterized in that: The outer diameter of the inner protective sleeve (52) is adapted to the inner diameter of the slide groove (56), and the inner protective sleeve (52) performs horizontal linear motion in the inner cavity of the outer protective sleeve (53).
5. The Teflon-lined ventilation duct according to claim 1, characterized in that: Two receiving grooves are provided on both the left and right ends of the upper and lower sides of the outer protective sleeve (53), and telescopic sleeve rods are fixed on both the left and right ends between the receiving groove and the opposite side of the fixing plate (54). The two receiving grooves are located on the left and right sides of the vertical center axis of the threaded rod (55).
6. The Teflon-lined ventilation duct according to claim 1, characterized in that: The inner diameters of the threaded groove (57) and the threaded hole (58) are both adapted to the outer diameter of the threaded rod (55).
7. The Teflon-lined ventilation duct according to claim 1, characterized in that: The plurality of thread grooves (57) are evenly distributed on the upper and lower sides of the inner protective sleeve (52), and the thread grooves (57) are threadedly connected to the thread grooves (57) and the threaded holes (58).
8. The Teflon-lined ventilation duct according to claim 1, characterized in that: The inner diameter of the inner protective sleeve (52) is adapted to the outer diameter of the stainless steel cylinder (1), and the outer diameter of the rotating ring (51) is greater than the outer diameter of the outer protective sleeve (53).