Centrifugal pump mechanical sealing structure capable of achieving cooling water circulation

Abstract

A centrifugal pump mechanical sealing structure capable of achieving cooling water circulation belongs to the technical field of fluid mechanical sealing and comprises a centrifugal pump and a mechanical sealing structure used for sealing the centrifugal pump, the centrifugal pump comprises a pump body, a shaft, a bearing and an impeller, the impeller is located in the pump body, and the shaft penetrates through the inner end of the pump body through the bearing to be connected with the impeller. The mechanical sealing structure is located on the shaft outer circumferential wall of the side, away from the inlet, of the impeller, the mechanical sealing structure comprises a sealing abutting piece, a rotary vane air resistance leakage-proof piece and a sealing ring piece, and an adjusting piece is arranged on the sealing abutting piece; the rotary vane air resistance leakproof piece comprises a movable sealing ring, a fixing block, rubber rotary vanes and a rotating shaft seat, and the rubber rotary vanes are evenly distributed on the outer circumferential wall of the movable sealing ring. According to the mechanical sealing structure, through a'static and dynamic 'dual leakage-proof system, multi-level sealing and dynamic adjustment of the pressure of the adjusting bolt are combined, all-directional leakage prevention is achieved, sealing pressure is stabilized, the mechanical sealing structure adapts to complex working conditions, and the problems of leakage and abrasion of traditional sealing are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid mechanical seals, and specifically to a mechanical seal structure for a centrifugal pump that can achieve cooling water circulation. Background Art

[0002] A centrifugal pump is a machine that uses the centrifugal force generated by the rotation of an impeller to transport fluids (such as water, oil, chemical media, etc.), and is widely used in fields such as chemical industry, petroleum, metallurgy, electric power, and water treatment.

[0003] The impeller is installed inside the pump casing and is driven by an electric motor to rotate at high speed, forcing the fluid inside the impeller to rotate with the impeller. Under the action of centrifugal force, the fluid is thrown towards the edge of the impeller and is collected by the volute (pump casing) and discharged from the outlet. At the same time, a low-pressure area is formed in the center of the impeller, and the fluid in the suction pool is pressed into the pump under the action of atmospheric pressure or liquid level difference to achieve continuous transportation.

[0004] When a centrifugal pump is working, there is relative movement between the rotating pump shaft and the stationary pump casing. If the seal is not good, it will cause medium leakage or intrusion of external impurities, leading to safety, efficiency, and environmental protection problems. To solve the above problems, mechanical seals, also known as face seals, are used. A dynamic ring (rotating with the shaft) and a static ring (fixed) are used to form a sealing surface by fitting their end faces for sealing.

[0005] The prior art discloses a mechanical seal for a centrifugal pump shaft seal, CN201811257040.9, which includes a dynamic ring. An inner dynamic seal ring is embedded on the inner side of one end of the dynamic ring, and a spring is arranged on the outer side of the other end of the dynamic ring. One end of the spring is fixedly connected to a spring seat, and a rubber plug is embedded at one end of the spring seat. The inner side of the dynamic seal ring is sleeved with a static ring, and a static seal ring is embedded on the inner side of one end of the static ring. The above invention seals by embedding a convex ring between a double-groove ring seat and a first connecting ring, and the dynamic seal ring is simultaneously embedded inside the first groove and the second groove. However, the mechanical seal of the above centrifugal pump shaft seal will leak under dynamic working conditions (such as shaft rotation, medium pressure fluctuation, etc.). When the dynamic ring rotates with the shaft and abuts against the static ring, the contact surface between the dynamic ring and the static ring is prone to wear under high-speed rotation, resulting in poor sealing performance and leakage.

[0006] In view of the above problems, a mechanical seal structure for a centrifugal pump that can achieve cooling water circulation is proposed. Summary of the Invention

[0007] The purpose of the present invention is to provide a mechanical seal structure for a centrifugal pump that can achieve cooling water circulation. By using this device for work, the problems in the above background are solved.

[0008] To achieve the above purpose, the present invention provides the following technical solutions:

[0009] A mechanical seal structure for a centrifugal pump capable of realizing cooling water circulation, comprising a centrifugal pump and a mechanical seal structure for sealing the centrifugal pump. The centrifugal pump includes a pump body, a shaft, bearings and an impeller. The impeller is located inside the pump body. The shaft passes through the inner end of the pump body through the bearings and is connected to the impeller. The mechanical seal structure is located on the outer circumferential wall of the shaft on the side of the impeller away from the inlet. The mechanical seal structure includes a sealing abutting member, a rotary vane air resistance leakage prevention member and a sealing ring member. An adjusting member is provided on the sealing abutting member;

[0010] The rotary vane air resistance leakage prevention member includes a dynamic seal ring, fixed blocks, rubber rotary vanes and a rotating shaft seat. A total of six fixed blocks are provided, and the six fixed blocks are evenly distributed on the outer circumferential wall of the dynamic seal ring. The rotating shaft seat is located on the outer wall of the dynamic seal ring on the clockwise side of each fixed block. A total of six rubber rotary vanes are provided, and the six rubber rotary vanes are evenly distributed on the outer circumferential wall of the dynamic seal ring, and one end of each rubber rotary vane is rotationally connected to the rotating shaft seat close to it through a rotating shaft.

[0011] Furthermore, the sealing ring member includes a first sealing sleeve and a second sealing sleeve. An annular sealing groove is formed on the outer circumferential wall of the middle part of the first sealing sleeve. The second sealing sleeve is connected to the outer wall of one end of the first sealing sleeve. An annular air resistance groove is formed on the inner circumferential wall of the end of the first sealing sleeve away from the second sealing sleeve.

[0012] Furthermore, the dynamic seal ring is located inside the annular air resistance groove, and the diameter of the dynamic seal ring is smaller than the diameter of the annular air resistance groove.

[0013] Furthermore, the sealing abutting member includes a abutting spring, an abutting rubber ring, a guiding rubber sleeve and a limiting seat. The guiding rubber sleeve is located on the outer wall of one side of the abutting rubber ring. The end of the abutting rubber ring away from the guiding rubber sleeve is sleeved on the outer circumferential wall of the second sealing sleeve. One end of the abutting spring is sleeved on the outer circumferential wall of the guiding rubber sleeve, and the other end of the abutting spring is connected to the inner circumferential wall of the limiting seat. A through hole through which the shaft passes is formed in the middle of the limiting seat.

[0014] Furthermore, a first annular convex block matching the annular sealing groove is provided on the inner wall of the pump body housing, and the first sealing sleeve is clamped and abutted against the first annular convex block on the inner wall of the pump body housing through the annular sealing groove.

[0015] Further, a second annular protrusion is provided on the inner wall of the pump body housing close to one side of the limit seat. Threaded holes are formed through both sides of the second annular protrusion, and abutting grooves are provided on the outer wall of the limit seat on one side of each threaded hole.

[0016] Further, the adjusting member includes an adjusting bolt. One end of the adjusting bolt threadedly penetrates through the end of the threaded hole and abuts against the abutting groove, and an internal hexagonal adjusting groove is formed at the other end of the adjusting bolt.

[0017] Further, the end of the shaft sequentially penetrates through the sealing abutting member, the sealing ring member and the rotary vane air resistance leakage prevention member and is connected to the impeller.

[0018] Further, the diameter of the dynamic sealing ring is larger than the internal shaft through diameter of the first sealing sleeve.

[0019] Further, when the shaft rotates, the dynamic sealing ring on its outer wall drives the rubber rotary vane to swing and abut against the annular air resistance groove.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. When the dynamic sealing ring in the rotary vane air resistance leakage prevention member rotates with the shaft, it drives the rubber rotary vane to rotate. The rubber rotary vane rotates at a high speed to form an air layer, which swings and abuts against the annular air resistance groove. This air layer can, to a certain extent, block water leakage, compensates for the sealing deficiency of the traditional mechanical seal structure under dynamic working conditions, and reduces leakage caused by shaft rotation, medium pressure fluctuation, etc. At the same time, when the rubber rotary vane rotates and swings, it squeezes the first sealing sleeve on the circumferential wall of the annular air resistance groove to closely abut against the inner wall of the pump body housing on one side of the first annular protrusion, preventing leakage.

[0022] 2. The mechanical seal structure includes a sealing abutting member, a rotary vane air resistance leakage prevention member and a sealing ring member. The first sealing sleeve in the sealing ring member is engaged and abutted against the first annular protrusion on the inner wall of the pump body housing through the annular sealing groove. Combined with the design of the rotary vane air resistance leakage prevention member and the air resistance groove, as well as the abutting effect of the sealing abutting member on each component, multiple sealing lines of defense are formed, greatly improving the overall sealing performance. The layout and connection method between components are reasonable, enabling the entire mechanical seal structure to work together during the operation of the centrifugal pump and reducing the problem of seal failure caused by component loosening or misalignment.

[0023] 3. The adjusting member (adjusting bolt) provided on the sealing abutting member can pass through the end of the threaded hole by threads and abut against the abutting groove. By adjusting the adjusting bolt, the abutting pressure can be adjusted to ensure the tight fit between the sealing abutting member and other components. Due to the elastic force of the abutting spring, the abutting rubber ring tightly abuts against the second sealing sleeve. During the abutting process, the first sealing sleeve is pushed to tightly engage and abut against the first annular protrusion on the inner wall of the pump body housing, preventing leakage. At this time, when the pump body starts, the pressure at the water inlet will push the first sealing sleeve on the other side away from the second sealing sleeve to squeeze and tightly engage with the first annular protrusion. Both sides are squeezed simultaneously to prevent liquid from leaking from the engaging part of the first annular protrusion.

[0024] 4. The mechanical seal structure of the present application is used in conjunction with the cooling water circulation system. It can not only effectively take away a large amount of heat generated by friction during the operation of the mechanical seal, reduce the temperature of the sealing surface, delay the wear of the sealing components, and significantly improve the service life and reliability of the mechanical seal. During the circulating flow of the cooling water, a certain pressure balance is formed in the sealing area, further enhancing the sealing effect, preventing the leakage of the medium in the centrifugal pump, and at the same time preventing the intrusion of external impurities, ensuring that the centrifugal pump can operate stably and efficiently under various complex working conditions, greatly improving the working efficiency and safety of the centrifugal pump, reducing equipment failures and maintenance costs caused by sealing problems, and providing a strong guarantee for the continuous and stable progress of related industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the overall axonometric view of the present invention;

[0026] Figure 2 is the schematic diagram of the internal structure of the centrifugal pump of the present invention;

[0027] Figure 3 is the axonometric view of the overall mechanical seal structure of the present invention;

[0028] Figure 4 is the side view of the rotary vane air resistance leak prevention member of the present invention;

[0029] Figure 5 is the schematic diagram of the seal ring member structure of the present invention;

[0030] Figure 6 is the schematic diagram of the sealing abutting member structure of the present invention;

[0031] Figure 7 is the side view of the connection between the overall mechanical seal structure of the present invention and the pump body;

[0032] Figure 8 is the axonometric view of the rotary vane air resistance leak prevention member of the present invention.

[0033] In the figure: 1, centrifugal pump; 11, pump body; 111, first annular convex block; 112, second annular convex block; 113, threaded hole; 12, shaft; 13, bearing; 14, impeller; 2, mechanical seal structure; 21, sealing abutting member; 211, abutting spring; 212, abutting rubber ring; 213, guiding rubber sleeve; 214, limiting seat; 215, through hole; 216, abutting groove; 217, adjusting bolt; 22, rotary vane air resistance leakage prevention member; 221, dynamic seal ring; 222, fixed block; 223, rubber rotary vane; 224, rotating shaft seat; 23, sealing ring member; 231, first sealing sleeve; 232, second sealing sleeve; 233, annular sealing groove; 234, annular air resistance groove. Detailed implementation mode

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] To solve the technical problems, such as Figures 1-8As shown in the figure, the following preferred technical solutions are provided: A mechanical seal structure for a centrifugal pump capable of realizing the circulation of cooling water, including a centrifugal pump 1 and a mechanical seal structure 2 for sealing the centrifugal pump 1. The centrifugal pump 1 includes a pump body 11, a shaft 12, bearings 13, and an impeller 14. The impeller 14 is located inside the pump body 11. The shaft 12 passes through the inner end of the pump body 11 through the bearings 13 and is connected to the impeller 14. The mechanical seal structure 2 is sleeved on the outer circumferential wall of the shaft 12 behind the impeller 14 of the centrifugal pump 1 and is jointly composed of a sealing abutting member 21, a rotary vane air resistance leakage prevention member 22, and a sealing ring member 23. An adjusting member is provided on the sealing abutting member 21. The end of the shaft 12 sequentially passes through the sealing abutting member 21, the sealing ring member 23, and the rotary vane air resistance leakage prevention member 22 and is connected to the impeller 14. The rotary vane air resistance leakage prevention member 22 includes a dynamic seal ring 221, fixing blocks 222, rubber rotary vanes 223, and a rotating shaft seat 224. A total of six fixing blocks 222 are provided, and the six fixing blocks 222 are evenly distributed on the outer circumferential wall of the dynamic seal ring 221. The rotating shaft seat 224 is located on the outer wall of the dynamic seal ring 221 on the clockwise side of each fixing block 222. A total of six rubber rotary vanes 223 are provided, and the six rubber rotary vanes 223 are evenly distributed on the outer circumferential wall of the dynamic seal ring 221 and one end of each rubber rotary vane 223 is rotatably connected to the adjacent rotating shaft seat 224 through a rotating shaft. The dynamic seal ring 221 is located inside the annular air resistance groove 234. The diameter of the dynamic seal ring 221 is smaller than the diameter of the annular air resistance groove 234, ensuring that the rubber rotary vanes 223 rotate on the outer wall of the dynamic seal ring 221 and inside the annular air resistance groove 234. The diameter of the dynamic seal ring 221 is larger than the through diameter of the shaft 12 inside the first sealing sleeve 231. The dynamic seal ring 221 abuts and seals the first sealing sleeve 231 to prevent liquid leakage. When the shaft 12 rotates, the dynamic seal ring 221 on its outer wall drives the rubber rotary vanes 223 to swing and abut against the annular air resistance groove 234. When the dynamic seal ring 221 rotates with the shaft 12, it drives the circumferentially evenly distributed six rubber rotary vanes 223 to swing around the rotating shaft seat 224, forming an air layer by rotating at high speed in the annular air resistance groove 234, which not only blocks water leakage but also squeezes the first sealing sleeve 231 through the vane swing, strengthening its abutting sealing performance with the inner wall of the pump body 11. A single working principle realizes a double sealing effect.

[0036] After the centrifugal pump 1 starts, the motor drives the shaft 12 to rotate. The shaft 12 rotates stably under the support of the bearing 13, and then drives the impeller 14 located inside the pump body 11 to rotate. The rotation of the impeller 14 generates centrifugal force, sucking the liquid into the pump body 11 and conveying it. When the shaft 12 rotates, the dynamic seal ring 221 sleeved on the shaft 12 rotates accordingly. Six rubber rotating blades 223 evenly distributed on the outer circumferential wall of the dynamic seal ring 221 make a swinging motion around the rotating shaft under the support of the rotating shaft seat 224. Since the dynamic seal ring 221 is located inside the annular air resistance groove 234, the rubber rotating blades 223 rotate at high speed in the annular air resistance groove 234, forming an air layer. This air layer plays a role in blocking water leakage, like an air curtain to prevent the liquid from leaking out from the gap between the shaft 12 and the sealing structure. At the same time, during the swinging process of the rubber rotating blades 223, the first seal sleeve 231 will be squeezed, making the first seal sleeve 231 closely abut against the inner wall of the pump body 11, further enhancing the sealing effect.

[0037] The air layer and air curtain blocking effect formed by the rotary vane air resistance leak prevention part 22 of the present application, and the mechanical seal strengthened by the swinging extrusion of the rubber rotary blade 223 on the first seal sleeve 231, the combination of the two achieves a double sealing effect. This double sealing can effectively block liquid leakage, especially in dynamic working conditions, such as when the shaft rotates and the medium pressure fluctuates, greatly improving the reliability of the seal and making up for the deficiencies of the traditional mechanical seal structure.

[0038] Furthermore, the mechanical seal structure 2 of the present application is used in conjunction with the cooling water circulation system. It can not only effectively take away a large amount of heat generated by friction during the operation of the mechanical seal, reduce the temperature of the seal surface, delay the wear of the seal components, significantly improve the service life and reliability of the mechanical seal, but also form a certain pressure balance in the sealing area during the circulating flow of the cooling water, further enhancing the sealing effect, preventing the medium in the centrifugal pump from leaking, and at the same time preventing the intrusion of external impurities, ensuring that the centrifugal pump can operate stably and efficiently under various complex working conditions, greatly improving the working efficiency and safety of the centrifugal pump, reducing equipment failures and maintenance costs caused by seal problems, and providing a strong guarantee for the continuous and stable progress of related industrial production.

[0039] Please refer to the appendix Figure 2 、 3, 5, 6 and 7, the sealing ring member 23 includes a first sealing sleeve 231 and a second sealing sleeve 232. An annular sealing groove 233 is provided on the outer circumferential wall of the middle part of the first sealing sleeve 231. The second sealing sleeve 232 is connected to the outer wall of one end of the first sealing sleeve 231. An annular air resistance groove 234 is provided on the inner circumferential wall of the end of the first sealing sleeve 231 away from the second sealing sleeve 232. A first annular protrusion 111 matching the annular sealing groove 233 is provided on the inner wall of the pump body 11. The first sealing sleeve 231 The annular sealing groove 233 is engaged with the first annular protrusion 111 on the inner wall of the pump body 11 shell, and the first sealing sleeve 231 and the second sealing sleeve 232 form an integrated sealing carrier, wherein the annular sealing groove 233 and the first annular protrusion 111 on the inner wall of the pump body 11 constitute a static engagement seal to ensure that there is no axial leakage between the sealing ring and the pump body 11; the annular air resistance groove 234 provides operating space for the rotary blade air resistance leakage prevention part 22, and realizes dynamic sealing through the air layer formed by the rotation of the rubber rotary blade 223. The combination forms a "static + dynamic" double anti-leakage system; the sealing abutment 21 includes an abutment spring 211, an abutment rubber ring 212, a guide rubber sleeve 213 and a limit seat 214, the guide rubber sleeve 213 is located on the outer wall of one side of the abutment rubber ring 212, and the end of the abutment rubber ring 212 away from the guide rubber sleeve 213 is sleeved on the outer circumferential wall of the second sealing sleeve 232, one end of the abutment spring 211 is sleeved on the outer circumferential wall of the guide rubber sleeve 213, and the other end of the abutment spring 211 is in contact with the limit seat 214. The inner circumferential walls are connected, a through hole 215 is provided in the middle of the limit seat 214 for the shaft 12 to pass through, a second annular protrusion 112 is provided on the inner wall of the pump body 11 near the limit seat 214, threaded holes 113 are provided on both sides of the second annular protrusion 112, and an abutment groove 216 is provided on the outer wall of the limit seat 214 on one side of each threaded hole 113, and the abutment spring 211 clamps the abutment rubber ring 212 to the outer wall of the second sealing sleeve 232 through the guide rubber sleeve 213 to form a radial seal;Meanwhile, the spring elastic force pushes the first sealing sleeve 231, causing its annular sealing groove 233 to tightly engage with the first annular bump 111 of the pump body, strengthening the axial seal. This structure utilizes the spring elasticity to compensate for component wear and maintain a long-term stable sealing pressure. The adjusting member includes an adjusting bolt 217. One end of the adjusting bolt 217 threadedly penetrates through the end of the threaded hole 113 and abuts against the abutting groove 216. The other end of the adjusting bolt 217 is provided with an internal hexagonal adjusting groove. The adjusting bolt 217 passes through the threaded hole 113 of the second annular bump 112 of the pump body and cooperates with the abutting groove 216 of the limit seat 214. The screwing depth of the bolt can be manually adjusted through the internal hexagonal adjusting groove, thereby changing the compression amount of the abutting spring 211 and realizing the dynamic adjustment of the pressure of the sealing abutting member 21 on the sealing ring member 23. This design can meet the sealing requirements under different working conditions such as medium pressure fluctuations and shaft vibrations, avoiding leakage caused by insufficient pressure or excessive wear due to excessive pressure. The pressure of the adjusting bolt 217 acts on the second sealing sleeve 232 and the first sealing sleeve 231 through the path of the limit seat 214 → abutting spring 211 → guiding rubber sleeve 213 → abutting rubber ring 212, forming a complete pressure adjustment closed-loop of "adjustment - transmission - execution" to ensure that the sealing structure is always in the best working state. This mechanical sealing structure realizes the organic unity of static sealing reliability, dynamic sealing adaptability, and pressure adjustment intelligence, effectively solving the leakage and wear problems of traditional sealing structures under the complex working conditions of centrifugal pumps.

[0040] During use, first, the sealing ring member 23 composed of the first sealing sleeve 231 and the second sealing sleeve 232 is sleeved on the shaft 12, and the annular sealing groove 233 of the first sealing sleeve 231 is engaged with the first annular bump 111 on the inner wall of the pump body 11 to complete the preliminary installation of the static seal. Then, the sealing abutting member 21 is installed. The abutting spring 211 is sleeved on the outer circumferential wall of the guiding rubber sleeve 213, and the abutting rubber ring 212 is sleeved on the outer circumferential wall of the second sealing sleeve 232. The limit seat 214 passes through its through hole 215 by the shaft 12 and cooperates with the second annular bump 112 on the inner wall of the pump body 11. A tool is used to adjust the screwing depth of the adjusting bolt 217 through the internal hexagonal adjusting groove of the adjusting bolt, so that the abutting spring 211 reaches an appropriate compression amount, thereby providing an initial sealing pressure for the sealing ring member 23. When the centrifugal pump starts and the shaft 12 begins to rotate, driving the dynamic seal ring 221 of the rotary vane air resistance leak prevention member 22 to rotate, the rubber rotary vanes 223 on the dynamic seal ring 221 rotate at high speed in the annular air resistance groove 234 to form an air layer, realizing dynamic sealing and blocking the radial leakage of liquid along the shaft 12. The abutting spring 211 tightly clamps the abutting rubber ring 212 on the outer wall of the second sealing sleeve 232 through the guiding rubber sleeve 213 to form a radial seal. Meanwhile, the spring elastic force pushes the first sealing sleeve 231, causing its annular sealing groove 233 to tightly engage with the first annular bump 111 of the pump body, strengthening the axial seal and preventing the axial leakage of liquid.

[0041] The "static + dynamic" double leakage prevention system of this application combines the static clamping seal of the annular seal groove 233 and the first annular bump 111 and the dynamic seal formed by the rotation of the rubber rotary blade 223 to form an air layer, comprehensively blocking the leakage of liquid along the axial and radial directions, greatly improving the reliability of the seal, and effectively solving the problem of easy leakage of traditional seal structures under complex working conditions;

[0042] Furthermore, the multi-level seal guarantee further enhances the overall seal effect with the radial and axial seal functions of the seal abutting member 21. The elastic effect of the abutting spring 211 ensures the stability of the seal pressure. Even when there is a certain amount of wear on the components, good seal performance can be maintained through elastic compensation;

[0043] Furthermore, the design of the adjusting bolt 217 enables the seal structure to dynamically adjust the pressure according to different working conditions. Whether it is the medium pressure fluctuation or shaft vibration, etc., the seal pressure can be changed in time through the adjusting bolt, avoiding the problems of leakage caused by insufficient pressure or excessive wear caused by excessive pressure, and ensuring the stable operation of the seal structure under various complex working conditions.

[0044] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0045] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mechanical seal structure for a centrifugal pump capable of realizing cooling water circulation, comprising a centrifugal pump (1) and a mechanical seal structure (2) for sealing the centrifugal pump (1), characterized in that: The centrifugal pump (1) comprises a pump body (11), a shaft (12), a bearing (13) and an impeller (14); the impeller (14) is located inside the pump body (11); the shaft (12) passes through the inner end of the pump body (11) via the bearing (13) and is connected to the impeller (14); the mechanical seal structure (2) is located on the outer circumferential wall of the shaft (12) at a side of the impeller (14) away from an inlet; the mechanical seal structure (2) comprises a sealing abutment (21), a rotary vane air-blocking anti-leakage component (22) and a sealing ring component (23); and an adjusting component is provided on the sealing abutment (21); The rotary blade air-blocking leakage prevention component (22) comprises a dynamic sealing ring (221), a fixed block (222), a rubber rotary blade (223) and a rotating shaft seat (224). A total of six fixed blocks (222) are provided, and the six fixed blocks (222) are evenly distributed on the outer circumferential wall of the dynamic sealing ring (221). The rotating shaft seat (224) is located on the outer wall of the dynamic sealing ring (221) on the clockwise side of each fixed block (222). A total of six rubber rotary blades (223) are provided, and the six rubber rotary blades (223) are evenly distributed on the outer circumferential wall of the dynamic sealing ring (221), and one end of each rubber rotary blade (223) is rotatably connected to the rotating shaft seat (224) adjacent to it through a rotating shaft.

2. A mechanical seal structure for a centrifugal pump capable of realizing cooling water circulation according to claim 1, characterized in that: The sealing ring component (23) comprises a first sealing sleeve (231) and a second sealing sleeve (232); an annular sealing groove (233) is provided on the outer circumferential wall in the middle of the first sealing sleeve (231); the second sealing sleeve (232) is connected to the outer wall of one end of the first sealing sleeve (231); and an annular air blocking groove (234) is provided on the inner circumferential wall of the end of the first sealing sleeve (231) away from the second sealing sleeve (232).

3. The mechanical seal structure for a centrifugal pump capable of realizing cooling water circulation according to claim 2, characterized in that: The dynamic sealing ring (221) is located inside the annular air resistance groove (234), and the diameter of the dynamic sealing ring (221) is smaller than the diameter of the annular air resistance groove (234).

4. The mechanical seal structure for a centrifugal pump capable of realizing cooling water circulation according to claim 3, characterized in that: The sealing abutment member (21) comprises an abutment spring (211), an abutment rubber ring (212), a guide rubber sleeve (213) and a limit seat (214); the guide rubber sleeve (213) is located on an outer wall of one side of the abutment rubber ring (212); one end of the abutment rubber ring (212) away from the guide rubber sleeve (213) is sleeved on the outer circumferential wall of the second sealing sleeve (232); one end of the abutment spring (211) is sleeved on the outer circumferential wall of the guide rubber sleeve (213); the other end of the abutment spring (211) is connected to the inner circumferential wall of the limit seat (214); and a through hole (215) is provided in the middle of the limit seat (214) through which the shaft (12) passes.

5. The mechanical seal structure for a centrifugal pump capable of realizing cooling water circulation according to claim 4, characterized in that: A first annular protrusion (111) matching the annular sealing groove (233) is provided on the inner wall of the pump body (11) shell, and the first sealing sleeve (231) is engaged and abutted with the first annular protrusion (111) on the inner wall of the pump body (11) shell through the annular sealing groove (233).

6. The mechanical seal structure for a centrifugal pump capable of realizing cooling water circulation according to claim 5, characterized in that: A second annular protrusion (112) is provided on the inner wall of the pump body (11) near the side of the limit seat (214), threaded holes (113) are provided on both sides of the second annular protrusion (112), and an abutment groove (216) is provided on the outer wall of the limit seat (214) on one side of each threaded hole (113).

7. The mechanical seal structure for a centrifugal pump capable of realizing cooling water circulation according to claim 1, characterized in that: The adjusting member comprises an adjusting bolt (217), one end of which is threadedly passed through the threaded hole (113) and abuts against the abutting groove (216), and the other end of the adjusting bolt (217) is provided with a hexagonal adjusting groove.

8. The mechanical seal structure for a centrifugal pump capable of realizing cooling water circulation according to claim 1, characterized in that: The end of the shaft (12) sequentially passes through the sealing abutment component (21), the sealing ring component (23) and the rotary blade air-blocking anti-leakage component (22) to be connected to the impeller (14).

9. The mechanical seal structure for a centrifugal pump capable of realizing cooling water circulation according to claim 5, characterized in that: The diameter of the dynamic sealing ring (221) is greater than the through diameter of the shaft (12) inside the first sealing sleeve (231).

10. The mechanical seal structure for a centrifugal pump capable of realizing cooling water circulation according to claim 3, characterized in that: When the shaft (12) rotates, the dynamic sealing ring (221) on its outer wall drives the rubber rotary blade (223) to swing and abut against the annular air resistance groove (234).

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