Mechanical seal for a fluorine circulation pump

Abstract

The utility model provides a kind of mechanical seal for fluorine circulating pump, its technical scheme is: including second dynamic ring, second dynamic ring includes fixed connection ring body and shaft body, second static ring, spring seat, base, first static ring, first dynamic ring and gland are sequentially sleeved on the shaft body, the first clamping groove is opened in the gland, the second clamping groove is opened in the shaft body of second dynamic ring, half split collar is engaged in first clamping groove and second clamping groove, to realize the fixation of gland on the shaft body of second dynamic ring.The utility model has the beneficial effects of: (1) double-end surface sealing design;(2) accurate positioning and anti-loosening mechanism;(3) multistage sealing protection;(4) maintenance efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of sealing device technology, and in particular relates to a mechanical seal for a fluorine circulation pump. Background Technology

[0002] In fluorine circulation pump systems used in chemical and metallurgical industries, the performance of the mechanical seal directly affects the safety, stability, and environmental friendliness of the equipment. Fluorine media is highly corrosive and permeable, placing stringent demands on the reliability of the sealing structure. Currently, fluorine circulation pumps commonly employ packing seals or traditional rubber-metal composite seals, but both have significant drawbacks:

[0003] Traditional packing seals rely on the friction between elastic materials and the shaft surface to achieve sealing. However, under high pressure and high speed conditions, the packing is prone to wear, leading to seal failure with a leakage rate as high as 5%-8%. Furthermore, maintenance is required every 10-15 days, resulting in high labor intensity. Simultaneously, debris generated from packing wear can contaminate the medium, affecting the purity of the process flow.

[0004] Although existing improved sealing structures employ a design combining a rubber K-type sealing ring and a copper bushing in an attempt to address corrosive media through a metal-rubber composite seal, the following technical bottlenecks still exist:

[0005] ① Insufficient corrosion resistance: Copper bushings are prone to electrochemical corrosion when operating in concentrated fluorine medium for a long time, which leads to an increase in the gap at the sealing interface. The average operating cycle is only about 30 days, and frequent shutdowns are required to replace parts.

[0006] ② High maintenance costs: Disassembly of sealing components requires specialized tools and is time-consuming. The cost of a single maintenance operation accounts for 15%-20% of the equipment operating cost, and the production interruption caused by downtime results in significant losses.

[0007] Therefore, developing a new type of mechanical seal structure that is suitable for highly corrosive media, high-pressure and high-speed operating conditions, and has the characteristics of long service life and easy maintenance has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0008] To address the aforementioned problems, this utility model provides a mechanical seal for a fluorine circulation pump. The technical solution includes a second rotating ring, which comprises a ring body and a shaft body that are fixedly connected. A second stationary ring, a spring seat, a base, a first stationary ring, a first rotating ring, and a pressure cap are sequentially sleeved on the shaft body. The pressure cap has a first retaining groove, and the shaft body of the second rotating ring has a second retaining groove. A half-snap retaining ring engages with the first and second retaining grooves to fix the pressure cap on the shaft body of the second rotating ring.

[0009] In a preferred embodiment, the second stationary ring is connected to the bottom of the spring seat, and a sealing ring is provided on the contact surface. The contact surface is the bottom surface of the second stationary ring and the top surface of the spring seat.

[0010] In a preferred embodiment, the upper part of the spring seat is provided with a second positioning rod in a circumferential array, and a limiting ring is fixedly provided on the inner wall of the base. The limiting ring is provided with a second positioning hole corresponding to the second positioning rod, and the limiting ring is also provided with a spring hole in a circumferential array. A spring is inserted into the spring hole, and the top end of the spring elastically abuts against the lower surface of the first stationary ring.

[0011] In a preferred embodiment, a limiting block is provided on the inner wall of the top of the base, and a first limiting groove adapted to the limiting block is provided on the side wall of the first stationary ring. The first stationary ring is horizontally fixed in the base by the cooperation of the limiting block and the first limiting groove.

[0012] In a preferred embodiment, the upper surface of the first moving ring is provided with a first positioning hole, and the lower surface of the pressure cover is provided with a first positioning rod corresponding to the first positioning hole. The first moving ring is kept horizontally fixed with the pressure cover by the cooperation between its first positioning hole and the first positioning rod of the pressure cover.

[0013] In a preferred embodiment, a first sealing ring is provided on the contact surface between the first moving ring and the gland.

[0014] In a preferred embodiment, a second sealing ring is also provided on the side wall of the first stationary ring.

[0015] In a preferred embodiment, the side wall of the gland is provided with a plurality of transmission positioning holes, and the side wall of the gland is also provided with positioning blocks, which are fixed by bolts that pass through themselves and are screwed into the threaded holes of the side wall of the gland.

[0016] In a preferred embodiment, the base has a hollow internal structure, and a coolant inlet and a coolant outlet are provided on the outer wall of the base. The coolant inlet and coolant outlet are respectively connected to the outlet and return ends of the coolant circulation device.

[0017] In a preferred embodiment, the bottom of the base is further fitted with a third sealing ring.

[0018] The beneficial effects of this utility model are:

[0019] (1) Double-end sealing design: The double-end sealing structure of the first dynamic ring-first stationary ring and the second dynamic ring-second stationary ring is adopted, and the elastic preload of the spring is used to form a double sealing barrier, which greatly reduces the possibility of fluorine leakage.

[0020] (2) Precise positioning and anti-loosening mechanism: The half-slot retaining ring achieves axial fixation of the cover and lower parts by engaging the first slot and the second slot, thereby improving the anti-loosening ability of each component; the cooperation between the limiting block and the first limiting slot, and the cooperation between the second positioning rod and the second positioning hole, ensure the radial positioning accuracy of each component and reduce wear caused by eccentricity;

[0021] (3) Multi-level sealing protection: The first sealing ring, the second sealing ring, the third sealing ring and the sealing ring at the bottom of the base form a quadruple static seal. The coolant circulation system removes frictional heat, preventing the sealing ring from aging due to high temperature, thus greatly extending the sealing life.

[0022] (4) Improved maintenance efficiency: The device has a simple structure (all related parts are mounted on the shaft of the second moving ring), and is easy to disassemble and assemble. According to the test, a mechanical seal can be disassembled and assembled in just 8 minutes, which greatly improves the maintenance and repair efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0024] Figure 2 This is a schematic diagram of the overall structure of this utility model from another perspective.

[0025] Figure 3 This is a schematic diagram of the structure of the pressure cap and the first moving ring in this utility model.

[0026] Figure 4 This is a schematic diagram of the structure of the first stationary ring in this utility model.

[0027] Figure 5 This is a schematic diagram of the structure of the second moving ring and the half-part retaining ring in this utility model.

[0028] Figure 6 This is a schematic diagram of the structure of the second stationary ring in this utility model.

[0029] Figure 7 This is a schematic diagram of the spring seat in this utility model.

[0030] Figure 8 This is a schematic diagram of the base structure in this utility model.

[0031] In the diagram: 1. Pressure cap; 101. Positioning block; 102. Transmission positioning hole; 103. First slot; 104. First positioning rod; 2. Half-segment retaining ring; 3. First moving ring; 301. First positioning hole; 302. First sealing ring; 4. First stationary ring; 401. First limiting groove; 402. Second sealing ring; 5. Second moving ring; 501. Second slot; 6. Second stationary ring; 7. Spring seat; 701. Second positioning rod; 8. Base; 801. Limiting ring; 802. Second positioning hole; 803. Spring hole; 804. Limiting block; 805. Coolant inlet; 806. Third sealing ring; 9. Spring. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] like Figure 1-2 The mechanical seal shown for a fluorine circulation pump includes a second rotating ring 5, which includes a ring body and a shaft body. The inner ring wall of the ring body is fixedly connected to the shaft body. Preferably, the inner ring wall of the ring body is welded to the lower part of the shaft body.

[0035] Furthermore, a second stationary ring 6, a spring seat 7, a base 8, a first stationary ring 4, a first moving ring 3, and a pressure cap 1 are sequentially sleeved on the shaft. The pressure cap 1 has a first slot 103, and the shaft of the second moving ring 5 has a second slot 501. The half-slot retaining ring 2 is engaged with the first slot 103 and the second slot 501 to fix the pressure cap 1 on the shaft of the second moving ring 5.

[0036] Press down the cover 1 so that the two half-rings 2 are first inserted into the second groove 501 to form a whole round ring. Then release the cover 1 and it springs up, so that the ring is inserted into the first groove 103, thus completing the axial fixation of the first moving ring 3, the first stationary ring 4 and the cover 1 on the shaft.

[0037] like Figure 6-7 The second stationary ring 6 shown is connected to the bottom of the spring seat 7, and a sealing ring is provided on the contact surface. The contact surface is the bottom surface of the second stationary ring 6 and the top surface of the spring seat 7. The second stationary ring 6 abuts against the spring seat 7 to prevent it from falling, and the sealing ring further enhances the sealing between the second stationary ring 6 and the spring seat 7 to prevent fluorine leakage.

[0038] like Figure 7-8The upper part of the spring seat 7 shown is provided with a second positioning rod 701 arranged in a circular array. The inner wall of the base 8 is fixedly provided with a limiting ring 801. The limiting ring 801 is provided with a second positioning hole 802 corresponding to the second positioning rod 701. The limiting ring 801 is also provided with a spring hole 803 arranged in a circular array. A spring 9 is inserted into the spring hole 803. The top of the spring 9 elastically abuts against the lower surface of the first stationary ring 4. The second positioning rod 701 on the spring seat 7 is inserted into the second positioning hole 802 on the limiting ring 801 from below, providing support for the spring 9 inserted into the spring hole 803 and preventing the spring 9 from falling. The spring 9 arranged in a circular array provides a uniform elastic force to the first stationary ring 4.

[0039] like Figure 4 and 8 The base 8 shown has a limiting block 804 on its top inner wall and a first limiting groove 401 that matches the limiting block 804 on its side wall. The first fixed ring 4 is horizontally fixed in the base 8 by the cooperation of the limiting block 804 and the first limiting groove 401. The lower surface of the first fixed ring 4 abuts against the spring 9. The limiting block 804 and the first limiting groove 401 cooperate with each other to prevent the first fixed ring 4 from rotating horizontally.

[0040] like Figure 3 The upper surface of the first moving ring 3 shown is provided with a first positioning hole 301, and the lower surface of the pressure cover 1 is provided with a first positioning rod 104 corresponding to the first positioning hole 301. The first moving ring 3 is connected to the pressure cover 1 through the cooperation of the first positioning hole 301 and the first positioning rod 104 to maintain horizontal fixation. The pressure cover 1 and the first moving ring 3 provide the cooperation of the first positioning hole 301 and the first positioning rod 104 to form a synchronously rotating whole.

[0041] like Figure 4 The first stationary ring 4 shown is also provided with a second sealing ring 402 on its side wall. The second sealing ring 402 fits into the inner wall of the base 8 to enhance the sealing between the first stationary ring 4 and the base 8 and prevent fluorine leakage.

[0042] like Figure 1-3 The pressure cap 1 shown has several transmission positioning holes 102 on its side wall. The pressure cap 1 also has a positioning block 101 on its side wall. The positioning block 101 is fixed by a bolt that passes through itself and is screwed into the threaded hole on the side wall of the pressure cap 1. The bolt in the transmission positioning hole 102 passes through the pressure rod and abuts against the shaft of the second moving ring 5 to prevent the pressure cap 1 from deviating from the axis. The positioning block 101 also prevents the pressure cap 1 from deviating from the axis.

[0043] like Figure 1 , 2The base 8 shown in Figure 8 has a hollow internal structure. A coolant inlet 805 and a coolant outlet are provided on the outer wall. The coolant inlet 805 and the coolant outlet (not marked in the figure, located on another outer side wall of the base 8) are connected to a coolant circulation device (existing technology, such as a circulation pump and water tank can be used to achieve this). The circulating coolant carries away the frictional heat between the components, reduces the temperature of the sealing surface, and prevents the sealing rings from aging due to high temperature.

[0044] like Figure 1 The bottom of the base 8 shown is also fitted with a third sealing ring 806 to increase the sealing between the device and the pump body and prevent fluorine leakage.

[0045] The installation process of the device is as follows: the second moving ring is sleeved on the pump shaft of the circulating pump, the second stationary ring is fixedly connected to the pump body shell through the flange, the first moving ring is sleeved on the pump shaft of another circulating pump, and then the coolant inlet 805 and the coolant outlet are respectively connected to the outlet and return ends of the coolant circulation device.

[0046] The aforementioned sealing rings are made of fluororubber or polytetrafluoroethylene, the stationary ring and the rotating ring are made of silicon carbide or ceramic, and the remaining parts are made of 2507 stainless steel.

Claims

1. A mechanical seal for a fluorine circulation pump, characterized in that, The second moving ring (5) includes a ring body and a shaft body that are fixedly connected. A second stationary ring (6), a spring seat (7), a base (8), a first stationary ring (4), a first moving ring (3), and a pressure cap (1) are sequentially sleeved on the shaft body. The pressure cap (1) is provided with a first slot (103), and the shaft body of the second moving ring (5) is provided with a second slot (501). The half-slot ring (2) is engaged with the first slot (103) and the second slot (501) to fix the pressure cap (1) on the shaft body of the second moving ring (5).

2. The mechanical seal for a fluorine circulation pump according to claim 1, characterized in that, The second stationary ring (6) is connected to the bottom of the spring seat (7), and a sealing ring is provided on the contact surface. The contact surface is the bottom surface of the second stationary ring (6) and the top surface of the spring seat (7).

3. The mechanical seal for a fluorine circulation pump according to claim 1, characterized in that, The upper part of the spring seat (7) is provided with a second positioning rod (701) in a circular array. The inner wall of the base (8) is fixedly provided with a limiting ring (801). The limiting ring (801) is provided with a second positioning hole (802) corresponding to the second positioning rod (701). The limiting ring (801) is also provided with a spring hole (803) in a circular array. A spring (9) is inserted into the spring hole (803). The top of the spring (9) elastically abuts against the lower surface of the first stationary ring (4).

4. The mechanical seal for a fluorine circulation pump according to claim 1, characterized in that, The base (8) has a limiting block (804) on its top inner wall and a first limiting groove (401) adapted to the limiting block (804) on its side wall. The first static ring (4) is horizontally fixed in the base (8) by the cooperation of the limiting block (804) and the first limiting groove (401).

5. The mechanical seal for a fluorine circulation pump according to claim 1, characterized in that, The upper surface of the first moving ring (3) is provided with a first positioning hole (301), and the lower surface of the pressure cover (1) is provided with a first positioning rod (104) corresponding to the first positioning hole (301). The first moving ring (3) is fixed horizontally with the pressure cover (1) through the cooperation of its first positioning hole (301) and the first positioning rod (104) of the pressure cover (1).

6. The mechanical seal for a fluorine circulation pump according to claim 1, characterized in that, The first moving ring (3) is provided with a first sealing ring (302) on the contact surface between the first moving ring (3) and the pressure cap (1).

7. The mechanical seal for a fluorine circulation pump according to claim 1, characterized in that, A second sealing ring (402) is also provided on the side wall of the first stationary ring (4).

8. The mechanical seal for a fluorine circulation pump according to claim 1, characterized in that, The pressure cap (1) has several transmission positioning holes (102) on its side wall, and a positioning block (101) is also provided on the side wall of the pressure cap (1). The positioning block (101) is fixed by a bolt that passes through itself and is screwed into the threaded hole of the side wall of the pressure cap (1).

9. The mechanical seal for a fluorine circulation pump according to claim 1, characterized in that, The base (8) has a hollow cavity structure inside. The outer wall of the base (8) is also provided with a coolant inlet (805) and a coolant outlet. The coolant inlet (805) and the coolant outlet are respectively connected to the outlet end and return end of the coolant circulation device.

10. The mechanical seal for a fluorine circulation pump according to claim 1, characterized in that, The bottom of the base (8) is also fitted with a third sealing ring (806).

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