Double-inserting-plate fluorine-lined door with sealed air

Abstract

The utility model relates to the field of panel door, especially a double-panel fluorine-lined panel door with sealing air, which comprises a main body mechanism, an anticorrosion mechanism arranged around the main body mechanism, a guide mechanism arranged inside the main body mechanism, a transmission mechanism arranged at the upper end of the main body mechanism, and a sealing mechanism arranged at the upper end of the main body mechanism. The utility model prolongs the service life of the anticorrosion mechanism and the sealing mechanism extension device, solves the problem that the existing device adopts a single anticorrosion measure of corrosion-resistant metal material, which is expensive and may cause great economic loss due to the expansion of point corrosion to large-area corrosion perforation of duplex stainless steel or high-nickel-based alloy material over time.

Description

Technical Field

[0001] This utility model belongs to the field of door inserts, specifically relating to a double-insertion fluoropolymer-lined door with a sealing air feature. Background Technology

[0002] Currently, many pipelines and flues that transport corrosive fluid media are experiencing corrosion and perforation of the metal components of the gate valves due to contact between the corrosive fluid media and the metal components, leading to leakage of the corrosive fluid media.

[0003] Existing technologies employ corrosion protection measures using a single corrosion-resistant metal material, which is expensive. Furthermore, over time, duplex stainless steel or high-nickel-based alloys can develop from pitting corrosion to large-area perforation, requiring the cessation of transport for repairs and resulting in significant economic losses. Utility Model Content

[0004] To overcome the problem that existing devices use a single corrosion-resistant metal material for corrosion protection, which is expensive and, over time, duplex stainless steel or high-nickel alloy materials will expand from pitting corrosion to large-area corrosion perforation, requiring the supply to be stopped for repair, resulting in significant economic losses, a double-insertion plate fluoropolymer-lined insert door with sealing air is proposed.

[0005] The technical solution of this utility model is as follows: a double-insertion plate fluoropolymer-lined door with sealing air, comprising a main body; an anti-corrosion mechanism is provided around the main body, a guide mechanism is provided inside the main body, a transmission mechanism is provided at the upper end of the main body, and a sealing mechanism is provided at the upper end of the main body; the main body includes a flange structure and a metal insert plate, and two grooves are opened at the upper end of the flange structure, with the metal insert plate slidably installed on the inner wall of the groove.

[0006] Furthermore, the corrosion protection mechanism includes fluoroplastic sheets; the outer walls of the flange structure and the metal insert are all fixed with fluoroplastic sheets.

[0007] Furthermore, the transmission mechanism includes a nut, a lead screw, a bracket, a bearing, and a motor; a bracket is fixed to the upper end of the flange structure, a lead screw is fixed to the upper end of the bracket, a motor is fixed to the upper end of the bracket, a bearing is fixed to the output end of the motor, a nut is threaded onto the side wall of the lead screw, and a nut is fixed to the center of the upper ends of the two metal plates.

[0008] Furthermore, the guiding mechanism includes a first stop and a second stop; the upper end of the flange structure is fixedly connected to two first stops, which are arranged inside the pipe or flue, and the upper end of the bracket is fixedly connected to two second stops.

[0009] Furthermore, the sealing mechanism includes a sealing air inlet and a sealing air shut-off valve; the upper end of the flange structure is fixedly connected to the sealing air inlet, and the upper end of the flange structure is fixedly connected to the sealing air shut-off valve.

[0010] Furthermore, the thickness of the fluoroplastic sheet is 1.5 to 2 millimeters.

[0011] Furthermore, the first stop is fixed to the flange structure using corrosion-resistant alloy bolts.

[0012] The beneficial effects of this utility model are as follows: The flange structure, support, and metal inserts are all lined with fluoropolymer, blocking contact between the medium and the metal substrate. This makes it suitable for harsh environments such as strong acids, strong alkalis, and strong oxidizing agents. The flanged edge process enhances the integrity of the anti-corrosion layer of the groove on the top of the flange, preventing the groove edge from being eroded by the medium due to a weak fluoropolymer lining, further improving local anti-corrosion capabilities. The two metal inserts move synchronously, forming a double-layer mechanical seal surface when closed, reducing the probability of leakage from a single sealing surface. When closed, the sealing air shut-off valve is activated, and high-pressure sealing air fills the space between the inserts and the flange, forming an airtight barrier to compensate for minor gaps in the mechanical seal. The two inserts are fixed by welding nuts to ensure parallelism and uniform force distribution, avoiding eccentricity of a single insert. The first and second stops are fixed to the flange and support respectively, providing guide tracks for the up-and-down movement of the inserts, limiting the lateral displacement of the inserts, and ensuring smooth operation. The screw and nut mechanism converts the rotational motion of the motor into linear motion, resulting in high transmission accuracy and stable torque. Attached Figure Description

[0013] Figure 1 The diagram shown is a three-dimensional structural schematic of this utility model;

[0014] Figure 2 The diagram shown is a three-dimensional structural diagram of the upper part of this utility model.

[0015] Figure 3 The diagram shown is a three-dimensional structural schematic of the side end of this utility model.

[0016] The markings in the attached diagram are as follows: 1. Flange structure; 2. Metal insert plate; 3. First stop block; 4. Second stop block; 6. Nut; 7. Lead screw; 8. Bracket; 9. Bearing; 10. Motor; 11. Fluoroplastic plate; 12. Sealing air interface; 13. Sealing air shut-off valve. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] The double-slot fluoropolymer-lined gate valve with sealing air is a high-end shut-off device designed specifically for pipeline systems handling corrosive media. Its core function is to achieve reliable shut-off and zero-leakage control of high-risk media such as strong acids, strong alkalis, and strong oxidants through the synergistic effect of the double-slot structure, fluoropolymer lining, and sealing air system. The device features a highly innovative structural design: the main valve body is made of high-strength carbon steel or stainless steel, and the internal cavity and two parallel insert plates are covered with a PTFE (polytetrafluoroethylene) or FEP (fluorinated ethylene propylene) lining with a thickness of 3-5mm. The PTFE lining is tightly bonded to the metal substrate through molding or hot-melt spraying processes, ensuring a smooth surface and excellent corrosion resistance. The two insert plates are arranged horizontally and symmetrically, and are driven synchronously by a gear rack or electric push rod. An independent isolation cavity is formed between the two insert plates, which can be filled with inert gas or connected to a sealing air system. The sealing air system consists of an external air source, a filter and pressure reducing device, air cavity pipes, and pressure equalization holes. An annular air cavity is set on the outer side of the upper and lower sealing surfaces of the valve body. Compressed air is reduced to 0.4-0.6MPa and then passes through the pressure equalization holes to form a uniform air curtain, creating a dynamic sealing barrier between the insert plates and the valve body sealing surfaces.

[0019] From a working principle perspective, the sealing mechanism of this slide gate valve breaks through the technical limitations of traditional single slide gate valves: when the valve is closed, the two slide gates are first driven to simultaneously engage with the valve seat. At this point, the fluoropolymer-lined sealing surfaces make initial contact, achieving a basic seal. Subsequently, the sealing air system is activated, and compressed air quickly fills the air chamber and forms a positive pressure air curtain along the gap between the sealing surfaces. The air curtain pressure is always 0.1-0.2 MPa higher than the pipeline medium pressure, thus preventing the medium from leaking to the outside. The isolation chamber between the two slide gates can be injected with inert gases such as nitrogen according to operating conditions, forming a double sealing barrier, which is especially suitable for vacuum systems or scenarios involving the transportation of toxic media. This triple sealing design of "mechanical seal + air curtain seal + isolation chamber" enables its sealing level to meet the zero-leakage requirement of the API 598 standard, and it can operate stably within a temperature range of -20℃ to 180℃ and under pressure conditions of 0-2.5 MPa.

[0020] Compared to traditional single-slide fluoropolymer-lined valves, this equipment has several technological advantages: Firstly, the double-slide structure changes the single sealing surface to a double sealing surface, and combined with the positive pressure of the sealing air, reduces the leakage rate from 1×10⁻⁻⁻⁶ for traditional valves. 4 m³ / (m・s) decreased to 1×10⁻ 6The first feature is a PTFE lining with a flow rate below m³ / (m・s), which effectively solves the problem of sealing surface wear caused by medium particle accumulation in single-plate valves. Secondly, the PTFE lining uses a gradient composite process, with the bottom layer being a mixture of reinforced PTFE and carbon fiber to improve tear resistance, and the top layer being pure FEP to reduce the coefficient of friction, thus reducing the opening and closing torque of the PTFE lining by 30% and extending its service life to 5-8 years (compared to approximately 2-3 years for traditional valves). Thirdly, the sealing air system can adjust the pressure and flow rate according to the characteristics of the medium. When crystalline particles are detected in the pipeline, the airflow can be increased to form an air curtain to prevent particle deposition on the sealing surface. Fourthly, the integrated intelligent monitoring module can collect data such as the PTFE lining temperature, sealing air pressure, and PTFE lining displacement in real time, and upload this data to the DCS system via a 485 communication interface. When the PTFE lining temperature exceeds 160℃ or the sealing air pressure is below 0.3MPa, the system automatically issues an audible and visual alarm and activates the backup air source.

[0021] In industrial applications, this gate valve exhibits exceptional adaptability to various operating conditions: In the inlet and outlet pipelines of hydrochloric acid synthesis furnaces in the chemical industry, where the medium contains hydrogen chloride gas and reaches a temperature of 120°C, traditional valves often leak due to lining corrosion. However, with the adoption of a double-gate structure with sealing air, the sealing air continuously blows away the hydrogen chloride gas, preventing it from condensing into acid on the sealing surface. After using this valve, a chlor-alkali enterprise saw a 92% reduction in leakage incidents. In desulfurization and denitrification systems in the metallurgical industry, where flue gas contains SO2, NOx, and dust, valves need to be frequently opened and closed at 150°C. The double-gate design, combined with a wear-resistant PFA lining (with a wear resistance coefficient twice that of PTFE), allows the valve to operate continuously for 15,000 times without leakage in flue gas with a dust content of 100 mg / m³. In waste acid treatment devices in the environmental protection industry, when treating 98% sulfuric acid, the sealing air system can be connected to dry air to prevent sulfuric acid vapor from condensing on the sealing surface. After adopting this valve, a waste acid incineration device in a chemical industrial park achieved three years of zero-leakage operation.

[0022] The equipment's maintenance system integrates preventative maintenance and condition-based inspection concepts: Routine maintenance requires regular inspection of the sealing air filter (recommended to replace the filter element quarterly) to ensure compressed air oil content <0.1mg / m³ and dust particle size <1μm; every six months, the fluoropolymer lining should undergo spark testing (test voltage 15kV, no breakdown is acceptable), with a focus on the edges of the gate plate and the transition area of ​​the sealing surface; when the valve opening and closing torque increases by more than 50% of its initial value, it needs to be disassembled and inspected for scratches or wear on the fluoropolymer lining and for dust accumulation and blockage in the sealing air cavity; for cold northern regions, electric heating should be installed on the outside of the sealing air duct (maintaining a temperature of 50-60℃) to prevent compressed air condensation and freezing. The modular design significantly reduces maintenance costs; the gate plate and fluoropolymer lining can be disassembled and replaced individually, saving 70% of maintenance costs compared to replacing the entire valve.

[0023] In future technological development trends, this type of gate valve will evolve towards greater intelligence and lighter weight: On the one hand, the introduction of graphene-reinforced fluoroplastic composite materials will improve the wear resistance of the fluoropolymer lining by 40% while reducing its thickness to 2mm, thus reducing the overall weight of the valve by 25%; on the other hand, an integrated AI fault diagnosis system will be developed, using machine learning algorithms to analyze historical operating data and predict the wear trend of the fluoropolymer lining in advance, transforming passive maintenance into proactive upkeep; furthermore, an operation and maintenance management platform combined with blockchain technology will be developed to record the material batches, manufacturing processes, and usage records of each valve on the blockchain, achieving full lifecycle traceability and further improving the inherent safety level of industrial pipeline systems. This high-end valve, integrating material innovation, intelligent control, and sealing technology, is becoming a core piece of equipment for managing corrosive media in process industries, providing crucial guarantees for safe production in high-risk industries such as chemical, metallurgical, and environmental protection.

[0024] Please see Figures 1-3 This utility model provides an embodiment: a double-insertion plate fluoropolymer-lined door with sealing air, including a main body; the main body is provided with an anti-corrosion mechanism around its perimeter, a guide mechanism is provided inside the main body, a transmission mechanism is provided at the upper end of the main body, and a sealing mechanism is provided at the upper end of the main body; the main body includes a flange structure 1 and a metal insert plate 2, the upper end of the flange structure 1 has two grooves, and the metal insert plate 2 is slidably installed on the inner wall of the grooves.

[0025] When in use, the double-slot fluoropolymer-lined gate valve with sealed air is placed in the pipeline or flue containing corrosive fluid media, and connected by flanges.

[0026] First, weld the flange structure 1 and the bracket 8, and then line them with fluoropolymer for corrosion protection. The groove at the top of the flange structure 1 needs to be flanged. Then, fix the first stop block 3 and the second stop block 4 to the flange structure 1 and the bracket 8 with bolts. Make the metal insert plate 2 and line it with fluoropolymer for corrosion protection. Pass the two metal insert plates 2 through the two grooves at the top of the flange structure 1 and weld them to the nuts 6 to ensure that the two metal insert plates 2 are parallel. Install the sealing device at the groove at the top of the flange structure 1. Install the lead screw 7 into the nut 6. Install the bearing 9 and the motor 10 on the upper part of the lead screw 7 and fix the bearing 9 and the motor 10 to the bracket 8.

[0027] During operation, the motor 10 rotates via the lead screw 7, causing the nut 6 to move up and down along the lead screw 7, thereby driving the two metal insert plates 2 to move up and down synchronously within the first stop 3 and the second stop 4. When the two metal insert plates 2 are at the bottom, the insert door is in the closed state; when the metal insert plates 2 are at the top, the insert door is in the fully open state; and when the metal insert plates 2 are in the middle position, the insert door is in the half-open state. When the insert door is in the closed state, the sealing air shut-off valve 13 is opened synchronously, allowing high-pressure sealing air to fill the space between the two metal insert plates 2 and the flange structure 1 through the sealing air interface 12, preventing fluid medium leakage. When the insert door is in the open state, the sealing air shut-off valve 13 is closed synchronously.

[0028] Please see Figure 1 In this embodiment, the anti-corrosion mechanism includes a fluoroplastic plate 11; the outer walls of the flange structure 1 and the metal insert plate 2 are both fixed with fluoroplastic plates 11, which have excellent anti-corrosion, wear resistance and elasticity properties, forming a protective layer.

[0029] Please see Figure 2 In this embodiment, the transmission mechanism includes a nut 6, a lead screw 7, a bracket 8, a bearing 9, and a motor 10; the upper end of the flange structure 1 is fixedly connected to the bracket 8, the upper end of the bracket 8 is fixedly connected to the lead screw 7, the upper end of the bracket 8 is fixedly connected to the motor 10, the output end of the motor 10 is fixedly connected to the bearing 9, the side wall of the lead screw 7 is threadedly connected to the nut 6, and the upper center of the two metal inserts 2 is fixedly connected to the nut 6, thereby realizing the automatic opening and closing of the insert door.

[0030] Please see Figure 3 In this embodiment, the guiding mechanism includes a first stop 3 and a second stop 4; the upper end of the flange structure 1 is fixedly connected to two first stops 3, which are arranged inside the pipe or flue, and the upper end of the bracket 8 is fixedly connected to two second stops 4. The first stops 3 provide guidance for the sliding of the metal insert 2 in the corrosive environment, and the second stops 4 ensure that the insert runs smoothly and prevents deviation.

[0031] Please see Figure 3 In this embodiment, the sealing mechanism includes a sealing air interface 12 and a sealing air shut-off valve 13; the upper end of the flange structure 1 is fixedly connected to the sealing air interface 12 and the upper end of the flange structure 1 is fixedly connected to the sealing air shut-off valve 13. Closing the sealing air shut-off valve 13 stops the supply of sealing air and reduces energy consumption.

[0032] Please see Figure 3 In this embodiment, the thickness of the fluoroplastic sheet 11 is 1.5 to 2 millimeters, which greatly extends the service life of the equipment.

[0033] Please see Figure 3In this embodiment, the first stop 3 is fixed to the flange structure 1 by corrosion-resistant alloy bolts, and serves as a guide groove for the two metal inserts 2 to slide in the fluid medium pipeline or flue.

[0034] Working principle: The double-slot fluoropolymer-lined gate valve with sealed air is placed in the pipeline or flue containing corrosive fluid media, and connected by flanges.

[0035] First, weld the flange structure 1 and the bracket 8, and then line them with fluoropolymer for corrosion protection. The groove at the top of the flange structure 1 needs to be flanged. Then, fix the first stop block 3 and the second stop block 4 to the flange structure 1 and the bracket 8 with bolts. Make the metal insert plate 2 and line it with fluoropolymer for corrosion protection. Pass the two metal insert plates 2 through the two grooves at the top of the flange structure 1 and weld them to the nuts 6 to ensure that the two metal insert plates 2 are parallel. Install the sealing device at the groove at the top of the flange structure 1. Install the lead screw 7 into the nut 6. Install the bearing 9 and the motor 10 on the upper part of the lead screw 7 and fix the bearing 9 and the motor 10 to the bracket 8.

[0036] During operation, the motor 10 rotates via the lead screw 7, causing the nut 6 to move up and down along the lead screw 7, thereby driving the two metal insert plates 2 to move up and down synchronously within the first stop 3 and the second stop 4. When the two metal insert plates 2 are at the bottom, the insert door is in the closed state; when the metal insert plates 2 are at the top, the insert door is in the fully open state; and when the metal insert plates 2 are in the middle position, the insert door is in the half-open state. When the insert door is in the closed state, the sealing air shut-off valve 13 is opened synchronously, allowing high-pressure sealing air to fill the space between the two metal insert plates 2 and the flange structure 1 through the sealing air interface 12, preventing fluid medium leakage. When the insert door is in the open state, the sealing air shut-off valve 13 is closed synchronously.

Claims

1. A double flourolined door with sealed air, characterized in that, It includes a main body structure; the main body structure is equipped with anti-corrosion mechanisms around its perimeter, a guide mechanism is installed inside the main body structure, a transmission mechanism is installed at the upper end of the main body structure, and a sealing mechanism is installed at the upper end of the main body structure; the main body structure includes a flange structure (1) and a metal insert plate (2), and two grooves are opened at the upper end of the flange structure (1), and the metal insert plate (2) is slidably installed on the inner wall of the groove.

2. A double gasketed fluoropolymer lined door with sealed air according to claim 1, wherein, The corrosion protection mechanism includes a fluoroplastic sheet (11); the outer walls of the flange structure (1) and the metal insert (2) are both fixed with fluoroplastic sheets (11).

3. A double gasketed fluoropolymer lined door with sealed air according to claim 1, wherein, The transmission mechanism includes a nut (6), a lead screw (7), a bracket (8), a bearing (9), and a motor (10); the upper end of the flange structure (1) is fixedly connected to the bracket (8), the upper end of the bracket (8) is fixedly connected to the lead screw (7), the upper end of the bracket (8) is fixedly connected to the motor (10), the output end of the motor (10) is fixedly connected to the bearing (9), the side wall of the lead screw (7) is threadedly connected to the nut (6), and the upper center of the two metal inserts (2) is fixedly connected to the nut (6).

4. A double gasketed fluoropolymer lined door with sealed air according to claim 3, wherein, The guiding mechanism includes a first stop (3) and a second stop (4); the upper end of the flange structure (1) is fixed with two first stops (3), which are arranged inside the pipe or flue, and the upper end of the bracket (8) is fixed with two second stops (4).

5. The double gasketed fluoropolymer gasketed door with sealed air according to claim 1, wherein, The sealing mechanism includes a sealing air inlet (12) and a sealing air shut-off valve (13); the upper end of the flange structure (1) is fixedly connected to the sealing air inlet (12) and the upper end of the flange structure (1) is fixedly connected to the sealing air shut-off valve (13).

6. A double gasketed fluoropolymer lined door with sealed air according to claim 2, wherein, The thickness of the fluoroplastic sheet (11) is 1.5 to 2 millimeters.

7. A double-panel fluoropolymer-lined door with airtight sealing as described in claim 4, characterized in that, The first stop (3) is fixed to the flange structure (1) by corrosion-resistant alloy bolts.

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