A tetrafluoro-coated closure nut for securing a fluoroplastic plate

Abstract

The utility model relates to a head nut technical field, especially a four fluorine outer clothing head nut for fixing fluorine plastic board, including nut body, still including sealing along and installation component, nut body lower extreme fixedly connected with sealing along, nut body outer surface is equipped with a layer of polytetrafluoroethylene outer clothing, and nut body upper end is provided with installation component, the utility model discloses through sandblasting treatment surface, and polytetrafluoroethylene powder is evenly sprayed on the nut body surface, and the dense outer clothing layer is formed through high -temperature sintering, through the high chemical stability and high temperature resistance of polytetrafluoroethylene outer clothing, make the nut service life extension, through filling high -temperature sealant and three millimeter thick soft four fluorine round pad or three millimeter thick high -temperature fluorine rubber pad in the sealing groove, further promote the sealing performance, solved because PTFE board itself welding fusibility just has no PFA effect good, and the welding firm degree is lower, and fluorine plastic cap is easy to crack under the flue harsh environment, causes the corrosion of bolt, leads to the problem of poor sealing.

Description

Technical Field

[0001] This utility model belongs to the technical field of end cap nuts, specifically relating to a PTFE-coated end cap nut for fixing fluoroplastic sheets. Background Technology

[0002] In modern industrial production, fluoroplastic sheets are widely used in numerous fields due to their excellent chemical stability, corrosion resistance, low coefficient of friction, and good electrical insulation properties. From chemical and electronics industries to food processing, from construction to aerospace, fluoroplastic sheets play an indispensable role.

[0003] In the existing technology, when installing fluoroplastic sheets, after the fluoroplastic sheet is fixed, a fluoroplastic nut needs to be covered and welded to the fluoroplastic sheet to improve the overall sealing performance and prevent corrosion and leakage of the flue and bolts in the area covered by the fluoroplastic sheet.

[0004] PTFE sheets are not as weldable as PFA sheets, resulting in weaker welds. Nuts are prone to cracking and corrosion in the harsh environment of flues, often leading to smoke leakage. This can cause severe corrosion and water leakage in the flues and bolts within the entire fluoroplastic sheet coverage area, affecting the flue's sealing and service life. Utility Model Content

[0005] To overcome the corrosion problem of existing fixing nuts during fixing, it is necessary to cover them with fluoroplastic caps and then weld them to the fluoroplastic sheet for sealing. However, since the welding fusion of PTFE sheet itself is not as good as that of PFA, the welding strength is relatively low. In the harsh environment of the flue, the weld of the plastic cap is prone to cracking, which causes flue gas corrosion and leads to poor sealing. Therefore, a PTFE-coated end cap nut for fixing fluoroplastic sheets is proposed.

[0006] The technical solution of this utility model is as follows: a PTFE-coated end cap nut for fixing fluoroplastic sheets, including a nut body; it also includes a sealing edge and an installation component; the sealing edge is fixedly connected to the lower end of the nut body, a layer of polytetrafluoroethylene coating is provided on the outer surface of the nut body, a sealing groove is provided at the lower end of the sealing edge, and an installation component is provided at the upper end of the nut body.

[0007] Preferably, the PTFE outer sheath is 1 to 1.5 millimeters thick and is bonded to the nut body by molding or spraying.

[0008] Preferably, the seal has an overall width of 30 mm, a depth of 2 mm before lining, and a depth of 1 mm after lining.

[0009] Preferably, the mounting assembly includes a flue wall panel, with the flue wall panel provided on the upper end of the nut body, and multiple studs fixed to the lower end of the flue wall panel, the studs being threadedly connected to the nut body.

[0010] As a preferred option, a fluoroplastic plate is provided between the nut body and the flue wall panel, and the thickness of the fluoroplastic plate is generally between 1.5 mm and 2 mm.

[0011] Preferably, the upper end of the fluoroplastic plate has a first groove through which a hole is formed, and the diameter of the first groove is one to two millimeters larger than the diameter of the stud.

[0012] Preferably, multiple studs are arranged in a matrix, and the maximum center distance between two adjacent stud holes does not exceed 600 mm.

[0013] The beneficial effects of this utility model are as follows: (1) After the nut body is formed by carbon steel or alloy steel, the surface is sandblasted and polytetrafluoroethylene powder is evenly sprayed onto the surface of the nut body. After high-temperature sintering, a dense outer layer is formed. The high chemical stability and high temperature resistance of the polytetrafluoroethylene outer layer extend the service life of the nut. The sealing performance is further improved by filling the sealing groove with high-temperature resistant sealant and a 3 mm thick soft PTFE round gasket or a 3 mm thick high-temperature fluororubber gasket. This solves the problem that the PTFE plate itself has a lower welding fusion effect than PFA, resulting in a lower welding firmness. The fluoroplastic cap is prone to cracking in the harsh environment of the flue, causing bolt corrosion and poor sealing. (2) The bolt sealing edge of this utility model is designed with a diameter of 30 mm. Compared with the previous method of fastening the nut with a gasket (generally the gasket diameter is about 20 mm), this increases the effective contact area between the fluoroplastic plate and the nut and the flue. The fit is tighter and reduces the tearing phenomenon of the inner lining bolt hole position caused by the creep of the fluoroplastic plate due to temperature changes. In particular, the fixing bolts at the top effectively protect the fluoroplastic plate and increase its service life. (3) The bolt sealing groove of this utility model plays the role of stabilizing the gasket and ensuring that the sealing gasket will not be biased when tightened. With the restriction of the sealing groove, the sealing gasket will be squeezed inward when the nut is tightened, which can more effectively seal the bolt and completely isolate the flue gas. Attached Figure Description

[0014] Figure 1 The diagram shown is a three-dimensional structural schematic of this utility model;

[0015] Figure 2 The diagram shown is a planar structural schematic of the nut body of this utility model;

[0016] Figure 3 The diagram shown is a three-dimensional structural schematic of the stud of this utility model;

[0017] Figure 4 The diagram shown is a planar structural schematic of the stud of this utility model;

[0018] Figure 5 The diagram shown is a cross-sectional three-dimensional structural schematic of the fluoroplastic sheet of this utility model.

[0019] The markings in the attached diagram are as follows: 1. Nut body; 101. Flue wall panel; 102. Stud; 103. Fluoroplastic plate; 104. First groove; 2. Sealing edge; 3. Sealing groove. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Fluoroplastic sheets, with their unique performance advantages, have demonstrated strong vitality in various industrial fields. In the chemical industry, they are widely used to make reactor linings, gaskets for pipes and valves, effectively resisting corrosion from various strong acids, alkalis, and organic solvents, ensuring the safety and stability of chemical production. In the electronics field, fluoroplastic sheets, due to their excellent electrical insulation properties, have become ideal materials for printed circuit boards and cable insulation layers, providing reliable protection for the high-performance operation of electronic equipment.

[0022] In the food processing industry, the hygienic, non-toxic, and non-stick properties of fluoroplastic sheets make them the preferred choice for food conveyor belts and linings of food processing equipment, ensuring food safety and quality. Furthermore, in the construction sector, fluoroplastic sheets can be used for roof waterproofing and curtain wall sealing; in the aerospace field, their lightweight, high strength, and high-temperature resistance make them crucial for structural components and engine parts in aircraft.

[0023] Fluoroplastic sheets have extremely high resistance to almost all chemicals and can remain stable in harsh chemical environments such as strong acids, strong alkalis, and strong oxidants without undergoing chemical reactions. This makes them irreplaceable in highly corrosive industries such as chemical and pharmaceutical manufacturing.

[0024] Its excellent corrosion resistance enables it to effectively resist the erosion of various chemical media, greatly extending the service life of equipment and reducing maintenance costs. Fluoroplastic sheets maintain good corrosion resistance in both normal and high-temperature environments.

[0025] Fluoroplastic sheets have an extremely low coefficient of friction and a smooth surface, making them widely used in applications requiring reduced friction, such as mechanical transmission components and conveyor belts. The low coefficient of friction not only improves equipment operating efficiency but also reduces energy consumption and equipment wear.

[0026] Fluoroplastic sheets possess excellent electrical insulation properties, effectively preventing current conduction, making them ideal insulating materials in the electronics and electrical industries. They maintain stable electrical insulation performance under high voltage and high frequency environments, ensuring the safe operation of electronic equipment.

[0027] Traditional mechanical fastening methods, such as using ordinary bolts and nuts, present numerous problems when dealing with fluoroplastic sheets. Because fluoroplastic sheets are relatively soft, ordinary bolts and nuts can easily damage them during tightening, causing scratches, deformation, and other defects on the surface, affecting their sealing performance and service life. Furthermore, mechanical fastening methods are prone to loosening under long-term use due to vibration, temperature changes, and other factors, leading to decreased fixing effectiveness and potentially causing safety accidents.

[0028] Adhesive bonding is another common method for fixing fluoroplastic sheets. However, the performance of adhesives is limited by a variety of factors. On the one hand, different types of adhesives have significantly different bonding effects on fluoroplastic sheets, and the bonding strength of adhesives often fails to meet the requirements of high-strength and high-reliability applications. On the other hand, adhesives are prone to aging and failure under harsh environments such as high temperature, high humidity, and chemical corrosion, leading to decreased bonding strength and detachment of the fluoroplastic sheets. Furthermore, the use of adhesives also presents environmental problems; some adhesives contain harmful substances, posing potential threats to the environment and human health.

[0029] In terms of materials, the nut body is made of high-strength alloy material to ensure that it has sufficient mechanical strength to withstand external pressure and vibration, while the outer layer of PTFE material is "homogeneous" with the fluoroplastic sheet. The low surface energy of PTFE material prevents it from sticking or reacting chemically with the fluoroplastic sheet when in contact, while a special surface treatment process can increase the friction between the two to form a stable fixing structure.

[0030] Using reliable PTFE-coated end cap nuts to secure fluoroplastic sheets can reduce equipment maintenance frequency and downtime, improve production efficiency, and lower production costs. Furthermore, due to their excellent securing properties, they can extend the service life of both the fluoroplastic sheets and the equipment, reducing equipment replacement and maintenance costs and bringing significant economic benefits to enterprises.

[0031] With the increasing application of fluoroplastic sheets in more fields and the continuous improvement of product performance requirements, the market demand for PTFE-coated end nuts will continue to expand. It is expected that in the next few years, these nuts will be more widely used in industries such as chemical, electronics, food processing, construction, and aerospace, with a very broad market prospect. The research and development of PTFE-coated end nuts is of significant practical importance and urgency. It is a key technology for solving the problem of fixing fluoroplastic sheets, and plays an indispensable role in improving the safety and reliability of industrial production, promoting industry technological upgrading, and reducing production costs. With the continuous improvement and development of related technologies, PTFE-coated end nuts are expected to be widely used in various fields, bringing new changes to industrial production.

[0032] PTFE-coated end cap nuts not only solve the problems of traditional fixing methods and improve the safety, reliability, and efficiency of industrial production, but also provide strong support for the technological upgrading and development of related industries. It is believed that in the future, with continuous technological advancements and market expansion, PTFE-coated end cap nuts will play an even more important role and make a greater contribution to promoting the modernization of my country's industry.

[0033] Please see Figures 1-5 This utility model provides an embodiment: a PTFE-coated end cap nut for fixing fluoroplastic sheets, including a nut body 1; it also includes a sealing edge 2 and an installation component; the sealing edge 2 is fixedly connected to the lower end of the nut body 1, and a layer of PTFE coating is provided on the outer surface of the nut body 1. A sealing groove 3 is opened at the lower end of the sealing edge 2, and an installation component is provided at the upper end of the nut body 1. After the nut body 1 is formed from carbon steel or alloy steel, the surface is sandblasted, and PTFE powder is evenly sprayed onto the surface of the nut body 1. After high-temperature sintering, a dense coating layer is formed. The high chemical stability and high temperature resistance of the PTFE coating extend the service life of the nut. By filling the sealing groove 3 with high-temperature resistant sealant and a 3 mm thick soft PTFE round gasket or a 3 mm thick high-temperature fluororubber gasket, the sealing performance is further improved. This solves the problem that the welding fusion of PTFE sheets is not as good as that of PFA, the welding firmness is lower, and the fluoroplastic cap is prone to cracking in the harsh environment of the flue, causing bolt corrosion and resulting in poor sealing.

[0034] Please see Figures 2-5In this embodiment, the PTFE outer sheath is 1 mm to 1.5 mm thick and is bonded to the nut body 1 by molding or spraying. The sealing edge 2 has an overall width of 30 mm, a depth of 2 mm before lining, and a depth of 1 mm after lining. The mounting assembly includes a flue wall panel 101. The flue wall panel 101 is provided on the upper end of the nut body 1, and multiple studs 102 are fixed to the lower end of the flue wall panel 101. The studs 102 are threadedly connected to the nut body 1. A fluoroplastic plate 103 is provided between the nut body 1 and the flue wall panel 101. The thickness of the fluoroplastic plate 103 is generally between 1.5 mm and 2 mm. A first groove 104 is provided through the upper end of the fluoroplastic plate 103. The diameter of the first groove 104 is 1 mm to 2 mm larger than the diameter of the studs 102. The multiple studs 102 are arranged in a matrix. The maximum center distance between two adjacent stud holes 102 shall not exceed 600 mm. At the marked position of stud 102, use an electric drilling machine to penetrate the fluoroplastic plate 103. The hole diameter shall be larger than the stud diameter 102 to avoid deformation of the plate during drilling. The fluoroplastic plate 103 shall be fixed to the flue gas side of the flue wall panel 101 by the nut body 1. The nut body 1 has its own internal threads and is tightly connected to the stud 102 pre-welded to the wall panel. During the installation process, there are several corners inside the flue. The corners should be covered by a whole piece of fluoroplastic plate 103 as much as possible to avoid the weld seam being located at the corner. Since manual operation is difficult during welding and will affect the welding effect, if it is unavoidable to place the weld seam at the corner, a long fluoroplastic plate 103 shall be covered on the outside of the original weld seam to protect the weld seam, and the weld seam of the cover plate shall be placed on the flat surface.

[0035] In use, the nut body 1 is first formed from carbon steel or alloy steel. The surface is then sandblasted and polytetrafluoroethylene powder is evenly sprayed onto the surface of the nut body 1. After high-temperature sintering, a dense outer layer is formed. The high chemical stability and high temperature resistance of the polytetrafluoroethylene outer layer extend the service life of the nut. The sealing performance is further improved by filling the sealing groove 3 with high-temperature resistant sealant and a 3 mm thick soft PTFE round gasket or a 3 mm thick high-temperature fluororubber gasket.

[0036] At the marked position of stud 102, use an electric drill to penetrate the fluoroplastic plate 103. The hole diameter is larger than the diameter of stud 102 to avoid deformation of the plate during drilling. The fluoroplastic plate 103 is fixed to the flue gas side of the flue wall panel 101 through the nut body 1. The nut body 1 has its own internal thread and is tightly connected to the stud 102 pre-welded to the wall panel.

[0037] During installation, there are several corners inside the flue. The corners should be covered by a whole piece of fluoroplastic plate 103 as much as possible to avoid the weld seam being in the corner. Since manual operation is difficult during welding and will affect the welding effect, if it is unavoidable to place the weld seam in the corner, a long fluoroplastic plate 103 must be covered on the outside of the original weld seam to protect the weld seam, and the weld seam of the cover plate should be placed on the flat surface.

[0038] Through the above steps, after the nut body 1 is formed from carbon steel or alloy steel, the surface is sandblasted and polytetrafluoroethylene powder is evenly sprayed onto the surface of the nut body 1. After high-temperature sintering, a dense outer layer is formed. The high chemical stability and high temperature resistance of the polytetrafluoroethylene outer layer extend the service life of the nut. By filling the sealing groove 3 with high-temperature resistant sealant and a 3 mm thick soft PTFE round gasket or a 3 mm thick high-temperature fluororubber gasket, the sealing performance is further improved. This solves the problems that the welding fusion of PTFE plate itself is not as good as that of PFA, the welding firmness is lower, and the fluoroplastic cap is prone to cracking in the harsh environment of the flue, causing bolt corrosion and resulting in poor sealing.

Claims

1. A PTFE-coated end cap nut for fixing fluoroplastic sheets, comprising a nut body (1); characterized in that: It also includes a sealing edge (2) and an installation component; the lower end of the nut body (1) is fixed with a sealing edge (2), the outer surface of the nut body (1) is provided with a layer of polytetrafluoroethylene outer sheath, the lower end of the sealing edge (2) is provided with a sealing groove (3), and the upper end of the nut body (1) is provided with an installation component.

2. The PTFE-coated end cap nut for fixing fluoroplastic sheets according to claim 1, characterized in that: The polytetrafluoroethylene outer sheath is one to one and a half millimeters thick and is bonded to the nut body (1) by molding or spraying.

3. The PTFE-coated end cap nut for fixing fluoroplastic sheets according to claim 1, characterized in that: The sealing edge (2) has an overall width of 30 mm, a depth of 2 mm before lining, and a depth of 1 mm after lining.

4. The PTFE-coated end cap nut for fixing fluoroplastic sheets according to claim 1, characterized in that: The mounting assembly includes a flue wall panel (101), the upper end of the nut body (1) is provided with the flue wall panel (101), and the lower end of the flue wall panel (101) is fixed with multiple studs (102), which are threadedly connected to the nut body (1).

5. A PTFE-coated end cap nut for fixing fluoroplastic sheets according to claim 4, characterized in that: A fluoroplastic plate (103) is provided between the nut body (1) and the flue wall panel (101). The thickness of the fluoroplastic plate (103) is generally between 1.5 mm and 2 mm.

6. A PTFE-coated end cap nut for fixing fluoroplastic sheets according to claim 5, characterized in that: The upper end of the fluoroplastic sheet (103) is provided with a first groove (104), the diameter of the first groove (104) being one to two millimeters larger than the diameter of the stud (102).

7. A PTFE-coated end cap nut for fixing fluoroplastic sheets according to claim 4, characterized in that: Multiple studs (102) are arranged in a matrix, and the maximum center distance between the holes of two adjacent studs (102) does not exceed 600 mm.

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