Bipolar sealing structure for electrolytic fluorination tank

Abstract

A bipolar sealing structure for an electrolytic fluorination tank relates to the technical field of electrolytic fluorination equipment, and comprises a pressing plate and a conical gasket, and the pressing plate is provided with a first through hole for a bolt to pass through and a second through hole for an electrode bar to pass through; the lower end of the bolt is connected with a flange cover at the top of the electrolytic fluorination tank, the flange cover is provided with a conical hole for the electrode bar to penetrate through, a T-shaped insulation pad is arranged between the electrode bar and the second through hole, a conical gasket is arranged between the electrode bar and the conical hole, and the large end of the conical gasket abuts against the lower wall face of the pressing plate; and a first nut for applying pressure to the pressing plate and the conical gasket is screwed on the bolt positioned above the pressing plate. According to the bipolar sealing structure, through the synergistic effect of rigid compression and elastic deformation, the technical problems of insufficient sealing performance, reaction gas leakage, electrolyte leakage, sealing material hardening failure and the like of an existing electrolytic fluorination tank sealing structure are effectively solved.

Description

Technical Field

[0001] This utility model relates to the technical field of electrolytic fluorination equipment, and in particular to a bipolar sealing structure for an electrolytic fluorination tank. Background Technology

[0002] Electrolytic fluorination is a key technology for preparing fluorinated organic compounds. Its core equipment is the electrolytic fluorination tank, which needs to operate in a low-temperature (-20℃~50℃), low-pressure (atmospheric or slightly negative pressure) environment with highly corrosive hydrogen fluoride. Current technology typically uses a conventional gasket sandwiched between the flange cover and the flange plate at the top of the electrolytic fluorination tank. However, this sealing structure has significant technical defects: while the sealing is good under static conditions, it becomes insufficient under dynamic conditions such as tank vibration, temperature fluctuations, or pressure changes. This can easily lead to electrolyte leakage, hydrogen fluoride gas leakage causing atmospheric pollution, and leakage of fluorine-containing impurities from reaction byproducts posing safety hazards. Summary of the Invention

[0003] To address the aforementioned technical problems, the purpose of this utility model is to propose a bipolar sealing structure for an electrolytic fluorination tank.

[0004] The purpose of this utility model is achieved by the following technical solution. According to this utility model, a bipolar sealing structure for an electrolytic fluorination tank includes a pressure plate and a conical gasket. The pressure plate has a first through hole for a bolt to pass through and a second through hole for an electrode rod to pass through. The lower end of the bolt is connected to a flange cover at the top of the electrolytic fluorination tank. The flange cover has a conical hole for the electrode rod to pass through. A conical gasket is placed between the electrode rod and the conical hole, with the large end of the conical gasket abutting against the lower wall surface of the pressure plate. A first nut for applying pressure to the pressure plate and the conical gasket is screwed onto the bolt located above the pressure plate.

[0005] Furthermore, there are three first through holes, and a second through hole is provided between two adjacent first through holes.

[0006] Furthermore, the pressure plate is a square pressure plate with a length of L and a width of W. The hole distance between the centers of adjacent first and second through holes is P. The length L and the hole distance P satisfy L / P = 5.5 ± 0.5, and the width W and the hole distance P satisfy W / P = 1.0 ± 0.2.

[0007] Furthermore, the angle α between the tapered side of the tapered gasket and the axis is 5°±2°.

[0008] Furthermore, the large end diameter D and the small end diameter d of the conical gasket satisfy D / d=1.3±0.05.

[0009] Furthermore, a washer is provided between the first nut and the square pressure plate.

[0010] Furthermore, a T-shaped insulating pad is provided between the electrode rod and the second through hole.

[0011] Furthermore, the conical gasket is made of polytetrafluoroethylene (PTFE).

[0012] Based on the foregoing technical solution, this utility model has the following beneficial effects:

[0013] This bipolar sealing structure employs a combination of a rigid clamping mechanism of pressure plates and bolts with the elastic deformation of conical gaskets. This solves the problem of insufficient sealing performance of existing sealing structures under dynamic conditions such as tank vibration, temperature fluctuations, or pressure changes, significantly improving sealing performance. It is particularly suitable for extreme working environments with low temperature, low pressure, and strong corrosion. It can effectively overcome technical challenges such as reactive gas leakage, electrolyte leakage, and easy hardening and failure of sealing materials in highly corrosive media environments that exist in existing sealing structures.

[0014] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the sealing structure assembled on the flange cover in a bipolar sealing structure for an electrolytic fluorination tank according to this utility model.

[0016] Figure 2 yes Figure 1 A schematic diagram of the structure of a square pressure plate.

[0017] Figure 3 yes Figure 1 A schematic diagram of the structure of the conical gasket.

[0018] [Attached image labels]

[0019] 1. Electrolytic fluorination tank; 2. Flange cover; 3. Electrode rod; 4. Pressure plate; 401. First through hole; 402. Second through hole; 5. Bolt; 6. Tapered gasket; 7. Tapered hole; 8. First nut; 9. Second nut. Detailed Implementation

[0020] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings:

[0021] Please see Figure 1 This utility model discloses a bipolar sealing structure for an electrolytic fluorination tank, including a pressure plate 4 located above the electrolytic fluorination tank 1, such as... Figure 2As shown, a square pressure plate is used in this embodiment. Specifically, the square pressure plate is provided with three first through holes 401 for bolts 5 to pass through and two second through holes 402 for electrode rods 3 to pass through, and a second through hole 402 is provided between two adjacent first through holes 401. The length L of the square pressure plate is 138cm and the width W is 25cm. The hole distance P between the centers of adjacent first and second through holes is 25cm. Preferably, the length (L) and hole distance (P) of the square pressure plate satisfy L / P = 5.5 ± 0.5, and the width (W) and hole distance (P) satisfy W / P = 1.0 ± 0.2.

[0022] The lower end of the bolt 5 is connected to the flange cover 2 at the top of the electrolytic fluorination tank. Specifically, a first nut 8 is screwed onto the bolt located above the square pressure plate, and a gasket is provided between the first nut and the square pressure plate.

[0023] Furthermore, the flange cover 2 is provided with two conical holes 7 for the electrode rod to pass through. The electrode rod 3 passes through the second through hole 402 and the conical holes 7 and is then installed in the electrolytic fluorination tank 1. Specifically, a T-shaped insulating gasket is provided between the electrode rod 3 and the second through hole 402, a gasket is provided above the T-shaped insulating gasket, and a second nut 9, which is threadedly connected to the electrode rod 3, is screwed onto the gasket. A conical gasket 6, whose shape is adapted to the conical hole 7, is provided inside the conical hole 7, such as... Figure 3 As shown, the conical gasket 6 and the conical hole 7 are interference-fitted, and the angle α between the conical edge of the conical gasket 6 and the axis of the conical gasket is 5°±2° (preferably 4°~6°). In this embodiment, 7° is selected. The diameter D of the large end and the diameter d of the small end of the conical gasket 6 satisfy: D / d=1.2~1.5 (optimal 1.3±0.05). In this embodiment, the conical gasket is made of polytetrafluoroethylene (PTFE). Gaskets made of this material are not prone to embrittlement or cracking under low temperature and strong hydrogen fluoride corrosion conditions, and have a long service life. Compared with conventional gaskets, they are less likely to cause frequent shutdowns and have strong production continuity. The large end of the conical gasket 6 abuts against the lower wall of the square pressure plate, and the small end is placed in the conical hole 7. Specifically, a gap can be reserved between the small end of the conical gasket 6 and the bottom end of the conical hole 7 as needed.

[0024] The working principle of the bipolar sealing structure for an electrolytic fluorination tank of this utility model is as follows: By rotating the first nut 8 on the bolt 5, the first nut rotates and moves downward, causing the square pressure plate to move downward, thereby applying pressure to the conical gasket 6; at the same time, by rotating the second nut 9 on the electrode rod, the second nut rotates and moves downward, thereby applying downward pressure to the T-shaped insulating pad, so as to ensure that the insulating pad and the conical gasket always remain in contact during the downward movement of the square pressure plate. Combined with the elastic characteristics of the conical gasket 6 itself, after being subjected to the pressure of the square pressure plate, the small end of the conical gasket 6 is pressed into the aforementioned gap, thereby improving the pressure uniformity of the contact surface between the conical gasket 6 and the conical hole 7, and further improving the sealing performance.

[0025] Using the aforementioned technical solution, this utility model adopts a bipolar sealing structure of a square pressure plate and a conical gasket 6. Through the synergistic effect of the rigid clamping of the pressure plate and bolts and the elastic deformation of the conical gasket, the sealing performance is significantly improved. It is especially suitable for low-temperature, low-pressure hydrogen fluoride highly corrosive environments. It effectively solves the technical problems existing in the prior art, such as insufficient sealing performance, leakage of reaction gas, leakage of electrolyte, and easy hardening and failure of sealing materials under dynamic conditions such as tank vibration, temperature fluctuation or pressure change.

[0026] In other embodiments of this utility model, an insulating pad is no longer provided between the electrode rod and the second through hole, and a pressure plate with higher plastic strength is used instead of the pressure plate in this embodiment.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the design and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A bipolar seal structure for an electrolytic fluorination cell, characterized by: The device includes a pressure plate (4) and a conical gasket (6). The pressure plate (4) has a first through hole (401) for the bolt (5) to pass through and a second through hole (402) for the electrode rod (3) to pass through. The lower end of the bolt is connected to the flange cover (2) at the top of the electrolytic fluorination tank (1). The flange cover has a conical hole (7) for the electrode rod to pass through. The conical gasket (6) is provided between the electrode rod (3) and the conical hole (7), and the large end of the conical gasket abuts against the lower wall of the pressure plate. A first nut (8) for applying pressure to the pressure plate and the conical gasket is screwed onto the bolt located above the pressure plate.

2. The bipolar sealing structure for an electrolytic fluorination tank according to claim 1, characterized in that: There are three first through holes (401), and a second through hole (402) is provided between two adjacent first through holes (401).

3. A bipolar seal for an electrolytic fluorination cell according to claim 2, wherein: The pressure plate (4) is a square pressure plate with a length of L and a width of W. The hole distance between the centers of the adjacent first through hole (401) and second through hole (402) is P. The length L and the hole distance P satisfy L / P=5.5±0.5, and the width W and the hole distance P satisfy W / P=1.0±0.

2.

4. The bipolar sealing structure for an electrolytic fluorination tank according to claim 1, characterized in that: The angle α between the conical side of the conical gasket (6) and the axis is 5°±2°.

5. The bipolar seal for an electrolytic fluorination cell of claim 1 wherein: The large end diameter D and the small end diameter d of the conical gasket (6) satisfy D / d=1.3±0.

05.

6. A bipolar seal for an electrolytic fluorination cell according to claim 1, wherein: A washer is provided between the first nut (8) and the square pressure plate.

7. The bipolar sealing structure for an electrolytic fluorination tank according to claim 1, characterized in that: A T-shaped insulating pad is provided between the electrode rod (3) and the second through hole (402).

8. A bipolar seal for an electrolytic fluorination cell according to any one of claims 1 to 7, wherein: The conical gasket (6) is made of polytetrafluoroethylene.

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