A sealing structure of an anti-corrosion centrifugal pump and a centrifugal pump

Abstract

The present application provides a sealing structure of an anti-corrosion centrifugal pump and a centrifugal pump, which relates to the technical field of centrifugal pump sealing, a sealing structure of an anti-corrosion centrifugal pump and a centrifugal pump, comprising a moving ring, a stationary ring assembly, a sleeve, a push ring, a spring and a protective device that rotate synchronously with the pump shaft; the moving ring, the stationary ring assembly, the push ring and the spring are sequentially arranged on the sleeve; the protective device is arranged on the stationary ring assembly, which is used to isolate the medium from the stationary ring assembly and reduce medium erosion, the sleeve is arranged on the pump shaft in the sealing cavity formed by the pump body and the pump cover, the pump shaft passes through the sealing cavity and cooperates with the stationary ring assembly and the moving ring, and the stationary ring assembly includes a stationary ring seat, a stationary ring and a sealing ring. The present application has the effect of effectively improving the anti-corrosion ability of the sealing structure and extending the service life of the sealing structure.

Description

Technical Field

[0001] The present application relates to the technical field of centrifugal pumps, and in particular to a sealing structure of an anti-corrosion centrifugal pump and a centrifugal pump. Background Art

[0002] As an important fluid conveying equipment, centrifugal pumps are mainly used in non-ferrous metals, petroleum, chemicals, steel, papermaking, environmental protection, urban sewage treatment, mining, pickling, acid addition and other occasions for conveying highly corrosive fluids. They are also used in the nuclear power industry to pump some liquids containing radioactive media. When conveying corrosive media, centrifugal pumps need to ensure that the internal components of the pump are not corroded by the media, so as to ensure the long-term and stable operation of the equipment. In order to achieve this goal, centrifugal pumps usually need to be equipped with a reliable sealing structure.

[0003] The sealing structure of most existing centrifugal pumps mainly includes mechanical seals. The mechanical seal structure prevents the leakage of the medium in the pump by fitting the dynamic ring and the static ring together, and uses the shaft sleeve to fix the dynamic ring and the static ring on the pump shaft; while the packing seal relies on the friction between the packing and the pump shaft to prevent liquid leakage.

[0004] However, the existing mechanical seal structure is easily corroded when immersed in the medium for a long time during use, especially when conveying highly corrosive and high-viscosity media, which leads to reduced sealing performance or even failure, and increases equipment maintenance costs and downtime. Based on this, a sealing structure of an anti-corrosion centrifugal pump and a centrifugal pump are provided to solve the above problems. Summary of the invention

[0005] In order to achieve effective sealing for a longer period of time and reduce direct contact between the medium and the seal in an environment with highly corrosive and high-viscosity media, the present application provides a sealing structure of an anti-corrosion centrifugal pump and a centrifugal pump.

[0006] In a first aspect, the present application provides a sealing structure of an anti-corrosion centrifugal pump, which adopts the following technical solution:

[0007] Including dynamic ring, static ring assembly, shaft sleeve, push ring, spring and protective device;

[0008] The stationary ring assembly comprises a stationary ring seat, a stationary ring and a sealing ring;

[0009] The stationary ring seat and the stationary ring are both connected to the shaft sleeve, the stationary ring is in contact with the dynamic ring to form a sealing surface, the stationary ring seat is in contact with the push ring, and the push ring is connected to the stationary ring through the spring;

[0010] The protective device is arranged between the stationary ring seat and the stationary ring to isolate the high-viscosity medium from the stationary ring assembly.

[0011] By adopting the above technical solution, the sealing structure of the anti-corrosion centrifugal pump can effectively reduce the erosion of the medium on the static ring component and improve the sealing performance and service life.

[0012] Preferably, the protective device comprises an auxiliary stationary ring whose two ends are respectively in contact with the stationary ring seat and the stationary ring, and the auxiliary stationary ring is deformed by axial extrusion;

[0013] An auxiliary static ring sealing ring, wherein the auxiliary static ring sealing ring is installed on the auxiliary static ring, and the inner side of the auxiliary static ring sealing ring is in contact with the static ring;

[0014] A connecting and isolating assembly is used to fix the positions of the stationary ring seat and the auxiliary stationary ring.

[0015] By adopting the above technical scheme, the protective device includes an auxiliary static ring whose two ends are respectively fitted with the static ring seat and the static ring. The auxiliary static ring is deformed by axial extrusion, which enhances the adaptability and reliability of the sealing structure and reduces the erosion of the static ring assembly by the medium. The auxiliary static ring sealing ring is installed on the auxiliary static ring, and the inner side of the auxiliary static ring sealing ring is fitted with the static ring, which further improves the sealing performance and prevents medium leakage. The connecting isolation assembly is used to fix the relative position of the static ring seat and the auxiliary static ring, thereby ensuring the stability and durability of the entire sealing structure.

[0016] Preferably, the sealing ring comprises:

[0017] A first sealing ring, arranged on the stationary ring seat;

[0018] A second sealing ring, located between the stationary ring and the stationary ring seat;

[0019] The third sealing ring is located on the outer side of the auxiliary static ring.

[0020] By adopting the above technical scheme, the first sealing ring is arranged on the static ring seat, which can effectively prevent medium leakage and improve the sealing performance; the second sealing ring is located between the static ring and the static ring seat, further enhancing the sealing effect between the static ring and the static ring seat and reducing medium erosion; the third sealing ring is located on the outside of the auxiliary static ring and fits with the pump body, ensuring the sealing between the auxiliary static ring and the pump body and improving the reliability and corrosion resistance of the overall structure.

[0021] Preferably, the connection isolation component comprises:

[0022] A connecting sealing ring, a connecting spring and a connecting slider, wherein the connecting sealing ring is arranged between the auxiliary static ring and the static ring, and one end of the connecting spring is fixedly connected to the connecting slider.

[0023] By adopting the above technical solution, the connecting sealing ring in the connecting isolation assembly is arranged between the auxiliary static ring and the static ring, and one end of the connecting spring is fixedly connected to the connecting slider, which effectively fixes the position of the static ring seat and the auxiliary static ring, thereby enhancing the stability and sealing effect of the static ring assembly.

[0024] Preferably, a sealing groove is formed on one side of the auxiliary static ring opposite to the static ring, the number of the sealing grooves is two and the axial length of the two sealing grooves is slightly smaller than the axial length of the connecting sealing ring.

[0025] By adopting the above technical solution, a sealing groove is opened on the side opposite to the auxiliary static ring and the static ring. There are two sealing grooves and the sum of the axial lengths of the two sealing grooves is slightly smaller than the axial length of the connecting sealing ring, which can ensure reliable axial compression of the connecting sealing ring and further enhance the sealing effect of the device.

[0026] Preferably, a movable groove is provided on one side of the stationary ring seat, the inner wall of the movable groove is fixedly connected to an end of the connecting spring away from the connecting slider, the connecting slider is slidably connected to the movable groove, and a connecting hole arranged opposite to the movable groove is provided on the auxiliary stationary ring, and the connecting hole is slidably connected to the connecting slider.

[0027] By adopting the above technical solution, the movable groove opened on one side of the static ring seat cooperates with the connecting spring and the connecting slider, so that the connecting slider slides more smoothly in the movable groove, ensuring the stability of the auxiliary static ring position and the sealing effect, and improving the reliability of the sealing structure.

[0028] Preferably, the shaft sleeve is composed of a long shaft sleeve and a short shaft sleeve, and an adjustment gap is provided at the connection between the long shaft sleeve and the short shaft sleeve for adjusting the compression amount of the shaft sleeve.

[0029] By adopting the above technical solution, the sleeve is designed to be a structure consisting of a long sleeve and a short sleeve, and an adjustment gap is set at the connection between the long sleeve and the short sleeve, so that the compression amount of the sleeve can be adjusted to better adapt to the compression requirements under different working conditions and improve the adaptability and sealing effect of the sealing structure.

[0030] Preferably, the auxiliary static ring, the dynamic ring and the static ring seat are all mounted on the long shaft sleeve, and a compression amount of 4-6 mm is formed between the dynamic ring and the static ring.

[0031] By adopting the above technical solution, the auxiliary static ring, dynamic ring and static ring seat are all installed on the long shaft sleeve. The 4-6mm compression formed between the dynamic ring and the static ring can ensure that the mechanical sealing structure has good sealing performance during operation, effectively avoid medium leakage, and at the same time improve the stability and reliability of the sealing structure.

[0032] Preferably, the dynamic ring and the static ring are both made of pure pressureless sintered silicon carbide, the auxiliary static ring is in the form of a polytetrafluoroethylene bellows, and the static ring seat is made of polyvinylidene fluoride filled carbon fiber.

[0033] By adopting the above technical scheme, the dynamic ring and the static ring are made of pure pressureless sintered silicon carbide material, which improves the wear resistance and corrosion resistance and extends the service life of the mechanical seal; the auxiliary static ring adopts the form of a polytetrafluoroethylene bellows, which can deform when subjected to axial compression, thereby enhancing the sealing effect and balancing the defect of uneven force when the dynamic ring and the static ring are in contact; the static ring seat adopts polyvinylidene fluoride filled carbon fiber material, which further improves the corrosion resistance and stability of the sealing structure.

[0034] In a second aspect, the present application provides a centrifugal pump, including the sealing structure of the anti-corrosion centrifugal pump, and also including a pump body, a pump cover, a pump shaft, a machine seal seat and a water seal;

[0035] The water seal is arranged between the pump cover and the machine seal seat, the pump shaft is passed through the sealed cavity formed by the pump body and the pump cover, and the sealing structure of the anti-corrosion centrifugal pump is arranged on the pump shaft.

[0036] By adopting the above technical scheme, the overall structural design of the anti-corrosion centrifugal pump ensures the tight connection between the pump body, pump cover, pump shaft, machine seal seat and water seal, further enhances the sealing effect of the anti-corrosion centrifugal pump and ensures the stability of the pump operation.

[0037] In summary, the present application includes at least one of the following beneficial effects:

[0038] 1. By setting up the protective device, the static ring assembly can better isolate the medium, and avoid the situation where the high-viscosity medium contacts the sealing ring in the static ring assembly over a large area, causing it to lose its sealing effect. The function of the sealing ring as a dynamic seal is fully protected, and the sealing performance of the sealing structure of the device is effectively protected, thereby ensuring the long-term stable operation of the equipment;

[0039] 2. The sealing surface is formed by the dynamic ring and the static ring. The auxiliary static ring adopts a polytetrafluoroethylene bellows to assist the force, which balances the defect of uneven force on the friction pair. At the same time, by setting the compression amount between the dynamic ring and the static ring, the overall reliability and stability of the mechanical seal are improved, and the maintenance cost and downtime caused by seal failure are reduced;

[0040] 3. The installation of auxiliary static rings and sealing rings effectively enhances the sealing effect of the static ring assembly and further reduces the possibility of the medium causing more corrosion to the sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0042] Figure 2 It is a schematic diagram of the structure of the static ring assembly of an embodiment of the present application;

[0043] Figure 3 It is a schematic diagram of the structure of the protective device of the embodiment of the present application;

[0044] Figure 4 This is an embodiment of the present application Figure 3 A schematic diagram of the structure enlargement at the center A;

[0045] Figure 5 This is an embodiment of the present application Figure 3 A magnified schematic diagram of the structure at point B in the middle.

[0046] Explanation of the reference numerals in the accompanying drawings: 1. Moving ring; 2. Stationary ring assembly; 21. Stationary ring seat; 22. Stationary ring; 23. Sealing ring; 231. First sealing ring; 232. Second sealing ring; 233. Third sealing ring; 3. Bushing; 31. Long bushing; 32. Short bushing; 4. Push ring; 5. Spring; 6. Protective device; 61. Auxiliary stationary ring; 62. Auxiliary stationary ring sealing ring; 63. Connecting isolation assembly; 631. Connecting sealing ring; 632. Connecting spring; 633. Connecting slider; 634. Sealing groove; 635. Moving groove; 636. Connecting hole; 7. Machine seal seat; 8. Water seal; 9. Pump cover; 10. Pump body; 11. Pump shaft. DETAILED DESCRIPTION

[0047] The following is combined with Figure 1-5 This application is described in further detail.

[0048] The embodiments of the present application provide a sealing structure of an anti-corrosion centrifugal pump and a centrifugal pump.

[0049] refer to Figure 1-2 The centrifugal pump includes a pump body 10, a pump cover 9, a pump shaft 11, a machine seal seat 7, a water seal 8 and a sealing structure of the anti-corrosion centrifugal pump. The water seal 8 is arranged between the pump cover 9 and the machine seal seat 7. The pump shaft 11 is penetrated into a sealed cavity formed by the pump body 10 and the pump cover 9. The sealing structure of the anti-corrosion centrifugal pump is arranged on the pump shaft 11.

[0050] Among them, the pump cover 9 is a water seal cover, which is not only used to fix the position of the water seal 8, but also provides an additional sealing layer. The water seal 8 is installed between the pump cover 9 and the mechanical seal seat 7 to form a closed environment to protect the internal mechanical seal from external impurities or moisture. The water seal 8 is made of fluororubber, which has excellent corrosion resistance and can effectively prevent the external environment from affecting the internal sealing components.

[0051] refer to Figure 1-2The sealing structure of the anti-corrosion centrifugal pump includes a dynamic ring 1, a static ring assembly 2, a push ring 4, a sleeve 3, a spring 5 and a protective device 6, wherein the dynamic ring 1, the static ring assembly 2, the push ring 4 and the spring 5 are sequentially arranged on the sleeve 3; the main function of the sleeve 3 is to carry the entire sealing mechanism and ensure that the seal remains stable during the rotation of the pump shaft. The protective device 6 is arranged on the static ring assembly 2 to isolate the medium from the static ring assembly 2 and reduce the erosion of the static ring assembly 2 by the medium; the sleeve 3 is arranged on the pump shaft in the sealing cavity formed by the pump body and the pump cover, so that the pump shaft passes through the sealing cavity and cooperates with the static ring assembly 2 and the dynamic ring 1, thereby achieving the effect of effectively protecting the static ring assembly 2 and reducing the erosion of the medium.

[0052] Among them, the moving ring 1 is made of pure pressureless sintered silicon carbide. The moving ring 1 is connected to the pump shaft by a key, so that the moving ring 1 rotates synchronously with the pump shaft. The sleeve 3 is composed of a long sleeve 31 and a short sleeve 32. The connection between the long sleeve 31 and the short sleeve 32 is provided with an adjustment gap for adjusting the compression of the sleeve 3. The segmented design of the long sleeve 31 and the short sleeve 32 can adjust the length between them according to actual use requirements to adapt to different working conditions. The adjustment gap is achieved by setting an elastic washer or spring at the connection of the sleeve 3, which can effectively adjust the relative movement between the pump shaft and the sleeve 3 and compensate for the axial displacement caused by factors such as thermal expansion during the operation of the pump shaft. The design of the adjustment gap enables the sleeve 3 to better adapt to the radial deformation of the pump shaft under different working conditions, ensuring the long-term stable operation of the sealing assembly. The adjustment gap can also be adjusted by a composite gasket or a flexible spring.

[0053] In practice, when the pump is started, the pump shaft rotates to drive the dynamic ring 1 to rotate, and the close contact between the dynamic ring 1 and the static ring 22 forms a main sealing surface to prevent leakage of the medium. At the same time, the auxiliary static ring 61 provides additional support in the form of a PTFE bellows, so that the contact pressure between the dynamic ring 1 and the static ring 22 is more evenly distributed, reducing the wear caused by uneven pressure. In addition, the design of the sealing ring 23 reduces the chance of direct contact between the medium and the sealing ring 23, thereby increasing the service life of the sealing ring 23.

[0054] refer to Figure 2-3The stationary ring assembly 2 includes a stationary ring seat 21, a stationary ring 22 and a sealing ring 23. The stationary ring 22 is also made of pure pressureless sintered silicon carbide to ensure the durability and corrosion resistance of the seal. There is a tight fit between the stationary ring 22 and the sleeve 3 to ensure that the stationary ring 22 does not slide relative to the sleeve 3 when the pump is running. The stationary ring seat 21 is fixed to the sleeve 3 through a connector and contacts the push ring 4. The stationary ring seat 21 is made of polyvinylidene fluoride filled carbon fiber material to enhance its corrosion resistance and wear resistance. The stationary ring 22 is mounted on the stationary ring seat 21, fits with the dynamic ring 1 and forms a sealing surface. The stationary ring seat 21 fits with the push ring 4, and the push ring 4 is connected to the stationary ring 22 through the spring 5, so that the sealing structure of the anti-corrosion centrifugal pump has better sealing performance, reduces the leakage of the medium, and prolongs the service life of the mechanical seal.

[0055] Among them, the sealing ring 23 includes a first sealing ring 231, a second sealing ring 232, and a third sealing ring 233. The first sealing ring 231 is arranged on the stationary ring seat 21, and is used for preliminarily sealing the dynamic ring 1 and the stationary ring assembly 2; the second sealing ring 232 is located between the stationary ring 22 and the stationary ring seat 21 to enhance the sealing of the stationary ring assembly 2. The first sealing ring 231 can be made of polyurethane material, which has good elasticity; the second sealing ring 232 is made of nitrile rubber, which has good adaptability and sealing properties to a variety of media.

[0056] refer to Figure 2-3 The protective device 6 includes an auxiliary static ring 61 whose two ends are respectively fitted with the static ring seat 21 and the static ring 22, and the auxiliary static ring 61 is deformed by axial extrusion. The auxiliary static ring 61 can be in the form of a polytetrafluoroethylene bellows, which effectively improves the axial compressibility and recovery of the protective device 6 and further improves the sealing effect. The protective device 6 is also provided with an auxiliary static ring sealing ring 62, which is installed on the auxiliary static ring 61. The inner side of the auxiliary static ring sealing ring 62 is fitted with the static ring 22, which further improves the sealing performance. The auxiliary static ring sealing ring 62 can be made of a material with strong corrosion resistance, such as polytetrafluoroethylene material or other polymer materials. The protective device 6 also includes a connecting isolation component 63, which can fix the position of the static ring seat 21 and the auxiliary static ring 61 to ensure that the two will not produce relative slip during the operation of the pump and maintain structural stability.

[0057] refer to Figure 4 and Figure 5The connection isolation assembly 63 includes a connection seal ring 631, a connection spring 632 and a connection slider 633. The connection seal ring 631 is arranged between the auxiliary static ring 61 and the static ring 22 to reduce the possibility of the medium entering the gap between the connection seal ring 631 and the static ring 22. The connection seal ring 631 is preferably made of corrosion-resistant fluororubber to ensure the sealing effect. One end of the connection spring 632 is fixedly connected to the connection slider 633, and the other end is fixedly connected to the moving groove 635 in the static ring seat 21. The connection slider 633 is slidably connected to the moving groove 635. The auxiliary static ring 61 is provided with a connection hole 636 arranged opposite to the moving groove 635. The connection hole 636 is slidably connected to the connection slider 633. By adjusting the initial compression amount of the connection spring 632, the contact tightness between the auxiliary static ring 61 and the static ring 22 can be accurately controlled to improve the sealing performance. The connection spring 632 is made of highly elastic stainless steel material to ensure a stable connection between the auxiliary static ring 61 and the static ring assembly 2, while having good corrosion resistance. The connection spring 632 can also be made of elastic memory alloy material.

[0058] A sealing groove 634 is provided on the side of the auxiliary static ring 61 opposite to the static ring 22. There are two sealing grooves 634 and the sum of the axial lengths of the two sealing grooves 634 is slightly smaller than the axial length of the connecting seal ring 631. This design enables the sealing groove 634 to effectively cooperate with the connecting seal ring 631 to prevent the medium from leaking from the gap between the auxiliary static ring 61 and the static ring 22. The edges of the sealing groove 634 are chamfered to prevent the connecting seal ring 631 from being cut off or damaged when under pressure, thereby ensuring the durability and reliability of the connecting seal ring 631. The sealing groove 634 on the auxiliary static ring 61 can be an arc groove or other forms of sealing groove 634.

[0059] The third sealing ring 233 is located outside the auxiliary static ring 61 and fits with the pump body 10 to prevent the medium from entering the gap between the auxiliary static ring 61 and the pump body. The third sealing ring 233 uses fluororubber, which can effectively prevent the erosion of acidic media.

[0060] The auxiliary static ring 61 and the static ring seat 21 are both installed on the long shaft sleeve 31, and a compression amount of 4-6 mm is formed between the dynamic ring 1 and the static ring 22. The compression amount of 4-6 mm is selected here to ensure the sealing effect while taking into account wear and material expansion during long-term work, providing a good initial pressure, so that the dynamic ring 1 and the static ring 22 maintain close contact and reduce medium leakage. At the same time, the design of the compression amount can be appropriately adjusted according to different working conditions to adapt to specific working environments or medium conditions.

[0061] The sealing structure of an anti-corrosion centrifugal pump and the implementation principle of the centrifugal pump in the embodiment of the present application are as follows:

[0062] By adopting multiple sealing components and reasonable gap design, the embodiment of the present application realizes effective protection of the internal components of the centrifugal pump when conveying corrosive media, and reduces the erosion of the sealing structure by the medium. Double sealing is achieved by the close cooperation of the dynamic ring 1 and the static ring 22 and multiple sealing rings 23, which improves the sealing effect. The medium is isolated by the auxiliary static ring 61, which effectively avoids the direct erosion of the static ring assembly 2 by the medium, and avoids the large-area contact of the high-viscosity medium with the second sealing ring 232, causing it to lose the sealing effect. The shaft sleeve 3 is designed with an adjustable interval according to actual needs, thereby ensuring efficient synchronization between the pump shaft and the sealing structure. The technical solution of the present application not only reduces the maintenance frequency and reduces the downtime, but also prolongs the service life of the sealing structure, improves the overall reliability of the centrifugal pump, and significantly improves the performance of the centrifugal pump when conveying corrosive media.

[0063] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A sealing structure for an anti-corrosion centrifugal pump, characterized in that: It comprises a moving ring (1), a stationary ring assembly (2), a shaft sleeve (3), a push ring (4), a spring (5) and a protective device (6); The stationary ring assembly (2) comprises a stationary ring seat (21), a stationary ring (22) and a sealing ring (23); The stationary ring seat (21) and the stationary ring (22) are both connected to the shaft sleeve (3); the stationary ring (22) is in contact with the moving ring (1) to form a sealing surface; the stationary ring seat (21) is in contact with the push ring (4); and the push ring (4) is connected to the stationary ring (22) via the spring (5); The protective device (6) is arranged between the stationary ring seat (21) and the stationary ring (22) to isolate the high-viscosity medium from the stationary ring assembly (2); The protective device (6) comprises an auxiliary stationary ring (61) whose two ends are respectively in contact with the stationary ring seat (21) and the stationary ring (22), and the auxiliary stationary ring (61) is deformed by axial compression; The sealing ring (23) comprises a second sealing ring (232) and a third sealing ring (233); the second sealing ring (232) is located between the stationary ring (22) and the stationary ring seat (21); the third sealing ring (233) is located outside the auxiliary stationary ring (61) and is in contact with the pump body (10); the second sealing ring (232) and the third sealing ring (233) are respectively located on both sides of the stationary ring seat (21); The protective device (6) further comprises a connection isolation assembly (63), wherein the connection isolation assembly (63) comprises a connection sealing ring (631), a connection spring (632) and a connection slider (633); the connection sealing ring (631) is arranged between the auxiliary static ring (61) and the static ring (22), and one end of the connection spring (632) is fixedly connected to the connection slider (633); A movable groove (635) is provided on one side of the stationary ring seat (21), an inner wall of the movable groove (635) is fixedly connected to an end of the connecting spring (632) away from the connecting slider (633), the connecting slider (633) is slidably connected to the movable groove (635), and a connecting hole (636) arranged opposite to the movable groove (635) is provided on the auxiliary stationary ring (61), and the connecting hole (636) is slidably connected to the connecting slider (633).

2. The sealing structure of an anti-corrosion centrifugal pump according to claim 1, characterized in that: The protection device (6) further comprises an auxiliary static ring sealing ring (62), wherein the auxiliary static ring sealing ring (62) is mounted on the auxiliary static ring (61), and the inner side of the auxiliary static ring sealing ring (62) is in contact with the static ring (22).

3. The sealing structure of an anti-corrosion centrifugal pump according to claim 2, characterized in that: The sealing ring (23) comprises a first sealing ring (231), and the first sealing ring (231) is arranged on the stationary ring seat (21).

4. The sealing structure of an anti-corrosion centrifugal pump according to claim 1, characterized in that: A sealing groove (634) is provided on one side of the auxiliary static ring (61) opposite to the static ring (22), the number of the sealing grooves (634) is two and the sum of the axial lengths of the two sealing grooves (634) is less than the axial length of the connecting sealing ring (631).

5. The sealing structure of an anti-corrosion centrifugal pump according to claim 2, characterized in that: The shaft sleeve (3) is composed of a long shaft sleeve (31) and a short shaft sleeve (32), and an adjustment gap is provided at the connection between the long shaft sleeve (31) and the short shaft sleeve (32) for adjusting the compression amount of the shaft sleeve (3).

6. The sealing structure of an anti-corrosion centrifugal pump according to claim 5, characterized in that: The auxiliary static ring (61), the dynamic ring (1) and the static ring seat (21) are all mounted on the long shaft sleeve (31), and a compression amount of 4-6 mm is formed between the dynamic ring (1) and the static ring (22).

7. The sealing structure of an anti-corrosion centrifugal pump according to claim 6, characterized in that: The dynamic ring (1) and the static ring (22) are both made of pure pressureless sintered silicon carbide, the auxiliary static ring (61) is in the form of a polytetrafluoroethylene bellows, and the static ring seat (21) is made of polyvinylidene fluoride filled carbon fiber.

8. An anti-corrosion centrifugal pump, characterized in that: A sealing structure of an anti-corrosion centrifugal pump comprising the sealing structure of any one of claims 1 to 7, further comprising a pump body (10), a pump cover (9), a pump shaft (11), a machine seal seat (7) and a water seal (8); The water seal (8) is arranged between the pump cover (9) and the machine seal seat (7), the pump shaft (11) is inserted into a sealed cavity formed by the pump body (10) and the pump cover (9), and the sealing structure of the anti-corrosion centrifugal pump is arranged on the pump shaft (11).

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