A vertical multistage stainless steel centrifugal pump

Abstract

This invention relates to the field of centrifugal pump technology, specifically disclosing a vertical multistage stainless steel centrifugal pump to solve the problems of how to avoid friction between the impeller and the cavity and poor sealing between multiple impellers; specifically, it includes: a centrifugal pump assembly; the centrifugal pump assembly includes a base, a centrifugal pump housing is installed on the top of the base, a connecting seat is fixed to the outer wall of the centrifugal pump housing, the connecting seat is connected to a motor base located above the centrifugal pump housing via a connecting part, and a motor body is installed on the top of the motor base; this invention abandons the cavity design of traditional vertical multistage stainless steel centrifugal pumps, solving the problems of excessive temperature and wear of the impeller body and inner tank due to friction, thereby improving the working efficiency and service life of the entire centrifugal pump assembly, and the setting of the sealing component can ensure the sealing of the adsorption chamber, thereby ensuring the negative pressure adsorption capacity of the impeller body, and thus ensuring the liquid delivery efficiency of the entire centrifugal pump assembly.

Description

Technical Field

[0001] This invention relates to the field of centrifugal pump technology, and more particularly to a vertical multistage stainless steel centrifugal pump. Background Technology

[0002] Vertical multistage stainless steel centrifugal pumps are widely used in various industries such as chemical, metallurgical, construction, and power due to their advantages of compact structure, small size, light weight, and good corrosion resistance. Currently, most vertical multistage stainless steel centrifugal pumps on the market adopt traditional structural designs, with core components including the motor, pump shaft, impeller, pump casing, and mechanical seal. While these designs can meet basic conveying requirements, they still have many shortcomings in long-term use.

[0003] Currently, the core structure (impeller assembly) of existing vertical multistage stainless steel centrifugal pumps often consists of an impeller and a cavity set in the inner wall of the pump casing. Although a balance disc structure is provided, the impeller will still undergo a certain displacement within the cavity during operation. During long-term operation of the vertical multistage stainless steel centrifugal pump, friction easily occurs between the impeller and the cavity, leading to overheating and wear of the impeller and the pump, which seriously affects the working efficiency and service life of the vertical multistage stainless steel centrifugal pump. Furthermore, since the impeller needs to rotate inside the cavity during operation, a certain gap must be left between the impeller and the cavity to ensure smooth rotation. However, this gap affects the sealing between multiple impellers, thereby affecting the negative pressure suction force generated by the impeller during rotation, ultimately affecting the liquid delivery efficiency of the vertical multistage stainless steel centrifugal pump.

[0004] To address the aforementioned technical deficiencies, a solution is proposed. This invention abandons the traditional cavity design of vertical multistage stainless steel centrifugal pumps, solving the problems of excessive temperature and wear caused by friction in the impeller body and inner tank. This improves the working efficiency and service life of the entire centrifugal pump assembly. Furthermore, the sealing component ensures the sealing of the adsorption chamber, thereby guaranteeing the negative pressure adsorption capacity of the impeller body and ensuring the liquid delivery efficiency of the entire centrifugal pump assembly. Summary of the Invention

[0005] The purpose of this invention is to provide a vertical multistage stainless steel centrifugal pump to solve the problems mentioned above.

[0006] The objective of this invention can be achieved through the following technical solution: a vertical multistage stainless steel centrifugal pump, comprising: Centrifugal pump assembly; The centrifugal pump assembly includes a base, a centrifugal pump housing is mounted on the top of the base, a connecting seat is fixed to the outer wall of the centrifugal pump housing, the connecting seat is connected to a motor base located above the centrifugal pump housing via a connecting part, and a motor body is mounted on the top of the motor base; The top of the connecting seat is provided with a fixing hole, and the top of the base is fixed with a screw that moves through the fixing hole. The outer wall of the screw is threaded with a fixing ring that abuts against the top of the connecting seat. The centrifugal pump housing has a perforation at the top, and a sealed bearing is installed inside the perforation. The output end of the motor body is fixed with a drive shaft that moves through the top of the motor base. The drive shaft is interference-fitted inside the sealed bearing and its end extends into the centrifugal pump housing. The centrifugal pump housing is equipped with an inlet flange and an outlet flange on its outer wall, and an inner liner located inside the centrifugal pump housing is installed at the end of the inlet flange. The outer wall of the drive shaft is provided with three impeller components located inside the inner liner; The impeller component includes an impeller body mounted on the outer wall of the drive shaft. Multiple sets of impeller grooves are formed inside the impeller body, and all of the multiple impeller grooves penetrate the outer wall of the impeller body. The bottom of the impeller body is provided with a water inlet groove that communicates with multiple sets of impeller grooves; A sealing assembly is provided at the bottom of the impeller body.

[0007] Preferably, the space between two adjacent impeller components is an adsorption cavity.

[0008] Preferably, the centrifugal pump housing and inner liner form a flow cavity.

[0009] Preferably, a vent valve is installed on the outer wall of the centrifugal pump housing.

[0010] Preferably, the sealing assembly includes a first sealing ring disposed at the bottom of the impeller body, and a second sealing ring movably disposed outside the first sealing ring is fixed to the inner wall of the inner liner. A first connecting groove is provided on the outer side of the first sealing ring, and a second connecting groove is provided on the inner side of the second sealing ring. The first connecting groove and the second connecting groove are equipped with a number of rolling balls inside. A connecting ring is fixed inside the first sealing ring, and the connecting ring is connected to the bottom of the impeller body by a second fixing bolt.

[0011] Preferably, a fixed lubricant is provided in the first connecting groove and the second connecting groove; The fixed lubricant is made of polytetrafluoroethylene composite material.

[0012] Preferably, two sealing elements are provided between the first sealing ring and the second sealing ring, and the two sealing elements are symmetrically arranged about a plurality of balls; The sealing element includes a first sealing groove formed on the outer side of the first sealing ring, and a second sealing groove formed on the inner side of the second sealing ring; Sealing rings are provided in the first sealing groove and the second sealing groove; The sealing ring is made of heat-resistant and wear-resistant rubber.

[0013] Preferably, it also includes a limiting component, the limiting component including a movable groove formed inside the second sealing ring, and a through groove connected to the movable groove at the bottom of the second sealing ring; A first concave block is fixed inside the movable groove, and a first limiting strip is movably connected inside the first concave block; The movable groove is movably connected to a second concave block, and the second concave block is movably connected to a second limiting strip. The first limiting strip has a movable cavity inside; The end of the second limiting strip is movably disposed inside the movable cavity; The outer walls of the first and second limiting strips are respectively provided with a first connecting hole and a second connecting hole, and movable pins are movably disposed inside the first and second connecting holes.

[0014] Preferably, the end of the second concave block is fixed with a stud that is movably disposed inside the through groove, and the outer wall of the stud is threaded with a limiting ring that abuts against the bottom of the second sealing ring; The first concave block, the second concave block, the first limiting strip, the second limiting strip, the movable pin, the stud, and the limiting ring are all made of stainless steel.

[0015] Preferably, it also includes a protective component, the protective sealing component including a protective plate connected to the outer wall of the connecting part by a first fixing bolt, the protective plate and the interior of the connecting part forming a protective cavity; The outer wall of the protective plate is provided with heat dissipation grooves; The outer wall of the protective plate has a round hole for the venting valve to pass through; The outer wall of the protective plate is fitted with a sealing shell located outside the fixing ring.

[0016] The beneficial effects of this invention are: 1. This invention abandons the cavity design of traditional vertical multistage stainless steel centrifugal pumps. The impeller body is directly set inside the inner tank. Therefore, the impeller body will not rub against the cavity during operation, thus eliminating the problem of excessive temperature and wear of the impeller body and inner tank due to friction. This improves the working efficiency and service life of the entire centrifugal pump assembly. Because a sealing assembly is provided at the bottom of the impeller body, specifically, the adsorption chamber can be initially sealed with the cooperation of the first sealing ring and the second sealing ring, and the adsorption chamber can be finally sealed with the cooperation of the sealing components (first sealing groove, second sealing groove, and sealing ring). Therefore, the present invention can ensure the sealing of the adsorption chamber, thereby ensuring the negative pressure adsorption capacity of the impeller body, and thus ensuring the liquid conveying efficiency of the entire centrifugal pump assembly. Because a first connecting groove is provided on the outside of the first sealing ring and a second connecting groove is provided on the inside of the second sealing ring, and several balls are rolled inside the first connecting groove and the second connecting groove, the cooperation of the several balls, the first connecting groove and the second connecting groove can ensure that the impeller body can rotate normally while also ensuring the sealing of the adsorption chamber, thus further ensuring the liquid conveying efficiency of the entire centrifugal pump assembly. Because a fixed lubricant is provided in the first connecting groove and the second connecting groove, the fixed lubricant can make the rolling balls roll more smoothly. On the one hand, it reduces the wear between the rolling balls, the first connecting groove and the second connecting groove, and improves the working efficiency and service life of the rolling balls, the first sealing ring and the second sealing ring. On the other hand, it also reduces the interference of the sealing components on the impeller body, and further ensures the liquid conveying efficiency of the entire centrifugal pump assembly. Furthermore, under the action of the sealing components (first sealing groove, second sealing groove, sealing ring), on the one hand, liquid can be prevented from entering the sealing assembly, thus improving the sealing performance of the adsorption chamber; on the other hand, the leakage of the fixed lubricant can be prevented, ensuring the rotation efficiency between the first sealing ring, the second sealing ring, and several balls, and indirectly ensuring the rotation efficiency of the impeller body. In summary, compared with existing designs, this invention abandons the cavity design of traditional vertical multistage stainless steel centrifugal pumps, solving the problems of excessive temperature and wear caused by friction in the impeller body and inner tank. This improves the working efficiency and service life of the entire centrifugal pump assembly. Furthermore, the sealing component ensures the sealing of the adsorption chamber, thereby ensuring the negative pressure adsorption capacity of the impeller body and thus ensuring the liquid delivery efficiency of the entire centrifugal pump assembly.

[0017] 2. This invention provides a limiting component. Specifically, by rotating the limiting ring, the limiting ring is no longer in contact with the bottom of the second sealing ring. At this point, the fixation of the second concave block can be released, and the second concave block can be driven to move within the movable cavity. The connection between the first and second limiting strips will be bent, and the bend of the first and second limiting strips will limit the sealing ring. Then, by rotating the limiting ring again, the limiting ring is brought into contact with the bottom of the second sealing ring, thus fixing the first and second limiting strips. Therefore, this invention limits the sealing ring by the bend of the first and second limiting strips, preventing the sealing ring from falling out of the first and second sealing grooves and ensuring the working efficiency of the sealing component. When the sealing ring needs to be replaced, first rotate the limiting ring so that it is not in contact with the bottom of the second sealing ring. At this time, the fixing of the second concave block can be released, and then the second concave block can be driven to move in the movable cavity. At this time, the first limiting strip and the second limiting strip will tend to be vertical and will be stored in the movable cavity. At this time, the sealing ring will not be limited by the first limiting strip and the second limiting strip, and the sealing ring can be replaced directly. Therefore, the present invention facilitates the replacement of the sealing ring and further ensures the working efficiency of the sealing component. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings; Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the drive shaft structure in this invention; Figure 3 This is a schematic diagram of the protective component structure in this invention; Figure 4 This is a schematic diagram of the inner liner structure in this invention; Figure 5 This is a schematic diagram of the internal structure of the inner liner in this invention; Figure 6 This is a schematic diagram of the impeller component structure in this invention; Figure 7 This is the present invention. Figure 6 A magnified structural diagram of A in the middle; Figure 8 This is a schematic diagram of the sealing component structure in this invention; Figure 9 This is a schematic diagram of the impeller body structure in this invention; Figure 10 This is a schematic diagram of the ball distribution structure in this invention.

[0019] Legend: 100, Centrifugal pump assembly; 101, Motor base; 102, Connecting seat; 103, Connecting part; 104, Motor body; 105, Centrifugal pump housing; 106, Base; 107, Inlet flange; 108, Outlet flange; 109, Vent valve; 110, Drive shaft; 111, Perforation; 112, Sealed bearing; 113, Impeller body; 114, Inlet groove; 115, Impeller groove; 116, Inner liner; 117, Screw; 118, Retaining ring; 200, Protective assembly; 201, Protective plate; 202, First fixing bolt; 203, Heat dissipation groove; 204, Round hole; 205. Sealing shell; 300. Sealing assembly; 301. Second sealing ring; 302. First sealing ring; 303. Second connecting groove; 304. First connecting groove; 305. Ball bearing; 306. Second sealing groove; 307. First sealing groove; 308. Sealing ring; 309. Connecting ring; 310. Second fixing bolt; 400. Limiting assembly; 401. Movable groove; 402. Through groove; 403. First concave block; 404. First limiting strip; 405. Movable cavity; 406. Second concave block; 407. Second limiting strip; 408. Movable pin; 409. Stud; 410. Limiting ring. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1: The application background of this invention is based on the fact that the core structure (impeller assembly) of existing vertical multistage stainless steel centrifugal pumps often consists of an impeller and a cavity set in the inner wall of the pump casing. Although a balance disc structure is provided, the impeller will still undergo a certain displacement within the cavity during operation. During long-term operation of the vertical multistage stainless steel centrifugal pump, friction easily occurs between the impeller and the cavity, leading to overheating and wear of the impeller and the pump, severely affecting the pump's efficiency and service life. Furthermore, since the impeller needs to rotate inside the cavity during operation, a certain gap must be maintained between the impeller and the cavity to ensure smooth rotation. However, this gap affects the sealing between multiple impellers, thus affecting the negative pressure suction force generated by the impeller during rotation, ultimately impacting the pump's liquid delivery efficiency. The technical solution of this invention addresses the problems of avoiding friction between the impeller and the cavity and poor sealing between multiple impellers. Please see Figure 1 , Figure 2 、 Figures 4-6 、 Figures 8-10As shown, this embodiment is a vertical multistage stainless steel centrifugal pump, including: a centrifugal pump assembly 100; the centrifugal pump assembly 100 includes a base 106, a centrifugal pump housing 105 is mounted on the top of the base 106, a connecting seat 102 is fixed to the outer wall of the centrifugal pump housing 105, the connecting seat 102 is connected to a motor seat 101 located above the centrifugal pump housing 105 via a connecting part 103, and a motor body 104 is mounted on the top of the motor seat 101; a fixing hole is opened on the top of the connecting seat 102, a screw 117 is fixed on the top of the base 106 that moves through the fixing hole, and a fixing ring 118 that abuts against the top of the connecting seat 102 is threaded to the outer wall of the screw 117; a through hole 111 is opened on the top of the centrifugal pump housing 105, and a motor body 104 is installed in the through hole 111. A sealed bearing 112 is provided; a drive shaft 110 is fixedly installed at the output end of the motor body 104, which movably passes through the top of the motor base 101. The drive shaft 110 is interference-fitted inside the sealed bearing 112, and its end extends into the centrifugal pump housing 105; an inlet flange 107 and an outlet flange 108 are installed on the outer wall of the centrifugal pump housing 105, and an inner liner 116 located inside the centrifugal pump housing 105 is installed at the end of the inlet flange 107; three impeller components are provided on the outer wall of the drive shaft 110, located inside the inner liner 116; the impeller components include an impeller body 113 installed on the outer wall of the drive shaft 110, and multiple sets of impeller grooves 115 are opened inside the impeller body 113, all of which penetrate the outer wall of the impeller body 113; the impeller body 11... The bottom of the impeller body 113 has an inlet groove 114 that communicates with multiple impeller grooves 115; a sealing assembly 300 is provided at the bottom of the impeller body 113, with an adsorption chamber between two adjacent impeller parts and a flow chamber between the centrifugal pump housing 105 and the inner liner 116. A vent valve 109 is installed on the outer wall of the centrifugal pump housing 105. The sealing assembly 300 includes a first sealing ring 302 provided at the bottom of the impeller body 113, and a second sealing ring 301 movably provided outside the first sealing ring 302 fixed on the inner wall of the inner liner 116. A first connecting groove 304 is provided on the outer side of the first sealing ring 302, and a second connecting groove 303 is provided on the inner side of the second sealing ring 301. Several balls 305 are rolled inside the first connecting groove 304 and the second connecting groove 303. A connecting ring 309 is fixed inside the first sealing ring 302. The connecting ring 309 is connected to the bottom of the impeller body 113 by a second fixing bolt 310. A fixing lubricant is provided in the first connecting groove 304 and the second connecting groove 303. The fixing lubricant is made of polytetrafluoroethylene composite material. Two sealing elements are provided between the first sealing ring 302 and the second sealing ring 301. The two sealing elements are symmetrically arranged about a plurality of balls 305. The sealing elements include a first sealing groove 307 opened on the outside of the first sealing ring 302 and a second sealing groove 306 opened on the inside of the second sealing ring 301. A sealing ring 308 is provided in the first sealing groove 307 and the second sealing groove 306. The sealing ring 308 is made of heat-resistant and wear-resistant rubber material. This invention abandons the cavity design of traditional vertical multistage stainless steel centrifugal pumps. The impeller body 113 is directly set inside the inner liner 116. Therefore, the impeller body 113 will not rub against the cavity during operation, thus eliminating the problem of excessive temperature and wear caused by friction between the impeller body 113 and the inner liner 116. This improves the working efficiency and service life of the entire centrifugal pump assembly 100. Because a sealing assembly 300 is provided at the bottom of the impeller body 113, specifically, the adsorption chamber can be initially sealed with the cooperation of the first sealing ring 302 and the second sealing ring 301, and the adsorption chamber can be finally sealed with the cooperation of the sealing elements (first sealing groove 307, second sealing groove 306, and sealing ring 308). Therefore, the present invention can ensure the sealing of the adsorption chamber, thereby ensuring the negative pressure adsorption capacity of the impeller body 113, and thus ensuring the liquid conveying efficiency of the entire centrifugal pump assembly 100. Since a first connecting groove 304 is provided on the outer side of the first sealing ring 302 and a second connecting groove 303 is provided on the inner side of the second sealing ring 301, and a number of balls 305 are rolled inside the first connecting groove 304 and the second connecting groove 303, the cooperation of the balls 305, the first connecting groove 304 and the second connecting groove 303 can ensure that the impeller body 113 can rotate normally while also ensuring the sealing of the adsorption chamber, thus further ensuring the liquid conveying efficiency of the entire centrifugal pump assembly 100. Because a fixed lubricant is provided in the first connecting groove 304 and the second connecting groove 303, the fixed lubricant can make the rolling balls 305 roll more smoothly. On the one hand, it reduces the wear between the rolling balls 305, the first connecting groove 304, and the second connecting groove 303, and improves the working efficiency and service life of the rolling balls 305, the first sealing ring 302, and the second sealing ring 301. On the other hand, it also reduces the interference of the sealing assembly 300 on the impeller body 113, and further ensures the liquid conveying efficiency of the entire centrifugal pump assembly 100. Furthermore, under the action of the sealing elements (first sealing groove 307, second sealing groove 306, sealing ring 308), on the one hand, liquid can be prevented from entering the sealing assembly 300, improving the sealing performance of the adsorption chamber; on the other hand, the leakage of the fixed lubricant can be prevented, ensuring the rotation efficiency between the first sealing ring 302, the second sealing ring 301, and several balls 305, and indirectly ensuring the rotation efficiency of the impeller body 113. In summary, compared with existing designs, this invention abandons the cavity design of traditional vertical multistage stainless steel centrifugal pumps, solving the problems of excessive temperature and wear caused by friction in the impeller body 113 and inner liner 116, thereby improving the working efficiency and service life of the entire centrifugal pump assembly 100. Furthermore, the sealing component 300 ensures the sealing of the adsorption chamber, thereby ensuring the negative pressure adsorption capacity of the impeller body 113, and thus ensuring the liquid conveying efficiency of the entire centrifugal pump assembly 100. Because the sealing ring 308 is made of heat-resistant and wear-resistant rubber, it can withstand high-temperature working conditions, effectively resisting material aging, deformation, or failure caused by high temperatures, ensuring the stability and sealing performance of the seal at high temperatures. It also has excellent wear resistance, which can reduce frictional loss when in contact with mating parts, reduce the risk of damage caused by frequent friction and scratches, and extend the actual service life of the sealing ring 308. At the same time, it can also rely on the elasticity of the rubber material itself to maintain a good sealing fit, reduce the risk of leakage, significantly improve the adaptability and reliability of the seal under complex working conditions, and reduce the frequency of equipment maintenance and replacement costs.

[0022] Example 2: Please refer to Figures 1-3 , Figure 7As shown, this embodiment is a vertical multistage stainless steel centrifugal pump, which also includes a limiting component 400. The limiting component 400 includes a movable groove 401 formed inside a second sealing ring 301, and a through groove 402 formed at the bottom of the second sealing ring 301 that communicates with the movable groove 401. A first concave block 403 is fixed inside the movable groove 401, and a first limiting strip 404 is movably connected inside the first concave block 403. A second concave block 406 is movably connected inside the movable groove 401, and a second limiting strip 407 is movably connected inside the second concave block 406. A movable cavity 405 is formed inside the first limiting strip 404. The end of the second limiting strip 407 is movably disposed inside the movable cavity 405. A first connecting hole and a second connecting hole are correspondingly formed on the outer walls of the first limiting strip 404 and the second limiting strip 407, and movable parts are movably disposed inside the first connecting hole and the second connecting hole. The movable pin 408 and the end of the second concave block 406 are fixed with a stud 409 that is movably disposed inside the through groove 402. The outer wall of the stud 409 is threadedly connected to a limiting ring 410 that abuts against the bottom of the second sealing ring 301. The first concave block 403, the second concave block 406, the first limiting strip 404, the second limiting strip 407, the movable pin 408, the stud 409, and the limiting ring 410 are all made of stainless steel. The system also includes a protective assembly 200. The protective sealing assembly includes a protective plate 201 that is connected to the outer wall of the connecting part 103 by a first fixing bolt 202. The protective plate 201 and the interior of the connecting part 103 form a protective cavity. The outer wall of the protective plate 201 has a heat dissipation groove 203. The outer wall of the protective plate 201 has a round hole 204 for the vent valve 109 to pass through. A sealing shell 205 located outside the fixing ring 118 is installed on the outer wall of the protective plate 201. This invention utilizes a limiting component 400. Specifically, by rotating the limiting ring 410, the limiting ring 410 is no longer in contact with the bottom of the second sealing ring 301. At this point, the fixation of the second concave block 406 can be released, and the second concave block 406 can then be driven to move within the movable cavity 405. A bend occurs at the connection between the first limiting strip 404 and the second limiting strip 407, and this bend limits the sealing ring 308. Rotating the limiting ring 410 again, so that it abuts against the bottom of the second sealing ring 301, fixes the first limiting strip 404 and the second limiting strip 407. Therefore, this invention limits the sealing ring 308 through the bends of the first limiting strip 404 and the second limiting strip 407, preventing the sealing ring 308 from falling out of the first sealing groove 307 and the second sealing groove 306, thus ensuring the working efficiency of the sealing component. When the sealing ring 308 needs to be replaced, first rotate the limiting ring 410 so that the limiting ring 410 is not in contact with the bottom of the second sealing ring 301. At this time, the fixation of the second concave block 406 can be released, and then the second concave block 406 can be driven to move in the movable cavity 405. At this time, the first limiting strip 404 and the second limiting strip 407 will tend to be vertical, and the first limiting strip 404 and the second limiting strip 407 will be stored in the movable cavity 405. At this time, the sealing ring 308 will not be limited by the first limiting strip 404 and the second limiting strip 407, and the sealing ring 308 can be replaced directly. Therefore, the present invention facilitates the replacement of the sealing ring 308 and further ensures the working efficiency of the sealing component. The protective plate 201 is connected to the outer wall of the connecting part 103 by the first fixing bolt 202. At this time, the protective plate 201 and the interior of the connecting part 103 form a protective cavity. With the cooperation of the protective plate 201 and the connecting column, the drive shaft 110 can be protected. On the one hand, the drive shaft 110 is prevented from being impacted by the outside world, ensuring the working efficiency and life of the drive shaft 110. On the other hand, it prevents the staff from being injured by accidentally touching the drive shaft 110, thus ensuring the personal safety of the staff.

[0023] In summary, please refer to the following: Figures 1-10Taking water delivery as an example, in use, the inlet flange 107 is first connected to the inlet pipe, and then the outlet flange 108 is connected to the outlet pipe. It is important to note that before the entire centrifugal pump assembly 100 operates, it needs to be filled with water before starting the motor body 104. The motor body 104 will drive the three impellers to rotate inside the inner tank 116 via the drive shaft 110. When the impellers rotate, the adsorption chambers of two adjacent impellers will generate negative pressure, thereby adsorbing the water inside the inner tank 116 into the adsorption chambers. Since there are multiple adsorption chambers, the three impellers, with the cooperation of multiple adsorption chambers, can increase the water pressure, thereby improving the water delivery efficiency. As the pump continues to operate, water continuously overflows from the inner tank 116 into the flow chamber and enters the outlet pipe through the outlet flange 108, thus completing the water delivery process. This invention abandons the traditional cavity design of vertical multistage stainless steel centrifugal pumps; the impeller body 113 is directly installed inside the inner tank 116. Therefore, the impeller body 113 does not rub against the cavity during operation, eliminating the problem of overheating and wear caused by friction between the impeller body 113 and the inner tank 116, thereby improving the working efficiency and service life of the entire centrifugal pump assembly 100. Because a sealing assembly 300 is provided at the bottom of the impeller body 113, specifically, the cooperation of the first sealing ring 302 and the second sealing ring 301... The adsorption chamber can be initially sealed, and with the cooperation of the sealing elements (first sealing groove 307, second sealing groove 306, sealing ring 308), the adsorption chamber can be finally sealed. Therefore, the present invention can ensure the sealing performance of the adsorption chamber, thereby ensuring the negative pressure adsorption capacity of the impeller body 113, and thus ensuring the liquid conveying efficiency of the entire centrifugal pump assembly 100. Since a first connecting groove 304 is opened on the outer side of the first sealing ring 302 and a second connecting groove 303 is opened on the inner side of the second sealing ring 301, and a number of rolling balls 305 are rolled inside the first connecting groove 304 and the second connecting groove 303, the adsorption chamber can be sealed in the cooperation of the rolling balls 305, the first connecting groove 304, and the second connecting groove 303. While ensuring the impeller body 113 can rotate normally, the sealing of the adsorption chamber is also taken into account, further ensuring the liquid conveying efficiency of the entire centrifugal pump assembly 100. Since a fixed lubricant is provided in the first connecting groove 304 and the second connecting groove 303, the fixed lubricant can make the rolling balls 305 roll more smoothly. On the one hand, it reduces the wear between the rolling balls 305, the first connecting groove 304, and the second connecting groove 303, and improves the working efficiency and service life of the rolling balls 305, the first sealing ring 302, and the second sealing ring 301. On the other hand, it also reduces the interference of the sealing assembly 300 on the impeller body 113, further ensuring the liquid conveying efficiency of the entire centrifugal pump assembly 100.Furthermore, under the action of the sealing components (first sealing groove 307, second sealing groove 306, sealing ring 308), on the one hand, liquid can be prevented from entering the sealing assembly 300, improving the sealing performance of the adsorption chamber; on the other hand, the leakage of the fixed lubricant can be prevented, ensuring the rotational efficiency between the first sealing ring 302, the second sealing ring 301, and several balls 305, indirectly ensuring the rotational efficiency of the impeller body 113. By setting the limiting component 400, specifically, by rotating the limiting ring 410, the limiting ring 410 is not in contact with the bottom of the second sealing ring 301, at which time the fixing of the second concave block 406 can be released. After fixing, the second concave block 406 can be driven to move within the movable cavity 405, and the connection between the first limiting strip 404 and the second limiting strip 407 will be bent. The bend in the first limiting strip 404 and the second limiting strip 407 will limit the sealing ring 308. Then, rotating the limiting ring 410 will cause it to abut against the bottom of the second sealing ring 301, thus fixing the first limiting strip 404 and the second limiting strip 407. Therefore, this invention limits the sealing ring 308 through the bend in the first limiting strip 404 and the second limiting strip 407, preventing the sealing ring 308 from moving out of the first sealing groove 307 and the second sealing groove 308. The second sealing ring 308 detaches from the sealing groove 306, ensuring the working efficiency of the sealing component. When the sealing ring 308 needs to be replaced, first rotate the limiting ring 410 so that the limiting ring 410 is not in contact with the bottom of the second sealing ring 301. At this time, the fixing of the second concave block 406 can be released, and then the second concave block 406 can be driven to move in the movable cavity 405. At this time, the first limiting strip 404 and the second limiting strip 407 will tend to be vertical, and the first limiting strip 404 and the second limiting strip 407 will be stored in the movable cavity 405. At this time, the sealing ring 308 will not be limited by the first limiting strip 404 and the second limiting strip 407, and can be directly... The sealing ring 308 can be replaced, making this invention convenient for replacement and further ensuring the working efficiency of the sealing component. The protective plate 201 is connected to the outer wall of the connecting part 103 via the first fixing bolt 202. At this time, the protective plate 201 and the interior of the connecting part 103 form a protective cavity. With the cooperation of the protective plate 201 and the connecting post, the drive shaft 110 can be protected. This prevents the drive shaft 110 from being impacted by external forces, ensuring its working efficiency and lifespan. Furthermore, it prevents workers from being injured by accidentally touching the drive shaft 110, ensuring the personal safety of the workers.

[0024] As can be seen from Embodiments 1 and 2, on the one hand, this invention abandons the cavity design of traditional vertical multistage stainless steel centrifugal pumps, solving the problem of excessive temperature and wear caused by friction in the impeller body 113 and inner liner 116, thereby improving the working efficiency and service life of the entire centrifugal pump assembly 100. Furthermore, the sealing component 300 ensures the sealing of the adsorption chamber, thus guaranteeing the negative pressure adsorption capacity of the impeller body 113, and consequently ensuring the liquid conveying efficiency of the entire centrifugal pump assembly 100. On the other hand, this invention limits the sealing ring 308 by setting a limiting component 400, preventing the sealing ring 308 from falling out of the first sealing groove 307 and the second sealing groove 306, ensuring the working efficiency of the sealing component. Moreover, the protective component 200 protects the drive shaft 110, preventing it from being impacted by external forces, ensuring the working efficiency and service life of the drive shaft 110, and preventing injury to personnel due to accidental contact with the drive shaft 110, thus ensuring the personal safety of the personnel.

[0025] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A vertical multistage stainless steel centrifugal pump, characterized in that, include: Centrifugal pump assembly (100); The centrifugal pump assembly (100) includes a base (106), a centrifugal pump housing (105) is mounted on the top of the base (106), a connecting seat (102) is fixed on the outer wall of the centrifugal pump housing (105), the connecting seat (102) is connected to a motor seat (101) located above the centrifugal pump housing (105) via a connecting part (103), and a motor body (104) is mounted on the top of the motor seat (101); The top of the connecting seat (102) is provided with a fixing hole, and the top of the base (106) is fixed with a screw (117) that moves through the fixing hole. The outer wall of the screw (117) is threaded with a fixing ring (118) that abuts against the top of the connecting seat (102). The centrifugal pump housing (105) has a perforation (111) at the top, and a sealed bearing (112) is installed in the perforation (111); The output end of the motor body (104) is fixed with a drive shaft (110) that moves through the top of the motor base (101). The drive shaft (110) is interference-fitted inside the sealed bearing (112) and its end extends into the centrifugal pump housing (105). The centrifugal pump housing (105) is equipped with an inlet flange (107) and an outlet flange (108) on its outer wall. The inlet flange (107) is equipped with an inner liner (116) located inside the centrifugal pump housing (105). The outer wall of the drive shaft (110) is provided with three impeller components located inside the inner liner (116); The impeller component includes an impeller body (113) mounted on the outer wall of the drive shaft (110). The impeller body (113) has multiple sets of impeller grooves (115) inside, and all of the multiple impeller grooves (115) penetrate the outer wall of the impeller body (113). The bottom of the impeller body (113) is provided with a water inlet groove (114) that is connected to multiple sets of impeller grooves (115); A sealing assembly (300) is provided at the bottom of the impeller body (113).

2. A vertical multistage stainless steel centrifugal pump according to claim 1, characterized in that, An adsorption cavity is formed between two adjacent impeller components.

3. A vertical multistage stainless steel centrifugal pump according to claim 1, characterized in that, The centrifugal pump has a flow chamber between its outer shell (105) and inner liner (116).

4. A vertical multistage stainless steel centrifugal pump according to claim 1, characterized in that, A vent valve (109) is installed on the outer wall of the centrifugal pump housing (105).

5. A vertical multistage stainless steel centrifugal pump according to claim 1, characterized in that, The sealing assembly (300) includes a first sealing ring (302) disposed at the bottom of the impeller body (113), and a second sealing ring (301) movably disposed outside the first sealing ring (302) is fixed on the inner wall of the inner liner (116). A first connecting groove (304) is provided on the outer side of the first sealing ring (302), and a second connecting groove (303) is provided on the inner side of the second sealing ring (301). The first connecting groove (304) and the second connecting groove (303) are provided with a plurality of rolling balls (305); A connecting ring (309) is fixed inside the first sealing ring (302), and the connecting ring (309) is connected to the bottom of the impeller body (113) by a second fixing bolt (310).

6. A vertical multistage stainless steel centrifugal pump according to claim 5, characterized in that, The first connecting groove (304) and the second connecting groove (303) are provided with a fixed lubricant; The fixed lubricant is made of polytetrafluoroethylene composite material.

7. A vertical multistage stainless steel centrifugal pump according to claim 5, characterized in that, Two sealing elements are provided between the first sealing ring (302) and the second sealing ring (301), and the two sealing elements are symmetrically arranged about a plurality of balls (305); The sealing element includes a first sealing groove (307) formed on the outer side of the first sealing ring (302), and a second sealing groove (306) formed on the inner side of the second sealing ring (301); A sealing ring (308) is provided in the first sealing groove (307) and the second sealing groove (306); The sealing ring (308) is made of heat-resistant and wear-resistant rubber.

8. A vertical multistage stainless steel centrifugal pump according to claim 1, characterized in that, It also includes a limiting component (400), which includes a movable groove (401) opened inside the second sealing ring (301), and a through groove (402) connected to the movable groove (401) is opened at the bottom of the second sealing ring (301). The movable groove (401) has a first concave block (403) fixed inside, and a first limiting strip (404) is movably connected inside the first concave block (403). The movable groove (401) is movably connected to a second concave block (406), and the second concave block (406) is movably connected to a second limiting strip (407). The first limiting bar (404) has a movable cavity (405) inside; The end of the second limiting bar (407) is movably disposed inside the movable cavity (405); The outer walls of the first limiting strip (404) and the second limiting strip (407) are respectively provided with a first connecting hole and a second connecting hole, and a movable pin (408) is movably provided inside the first connecting hole and the second connecting hole.

9. A vertical multistage stainless steel centrifugal pump according to claim 8, characterized in that, The end of the second concave block (406) is fixed with a stud (409) that is movably disposed inside the through groove (402), and the outer wall of the stud (409) is threaded with a limiting ring (410) that abuts against the bottom of the second sealing ring (301); The first concave block (403), the second concave block (406), the first limiting strip (404), the second limiting strip (407), the movable pin (408), the stud (409), and the limiting ring (410) are all made of stainless steel.

10. A vertical multistage stainless steel centrifugal pump according to claim 1, characterized in that, It also includes a protective assembly (200), which includes a protective plate (201) connected to the outer wall of the connecting part (103) by a first fixing bolt (202), and the protective plate (201) and the interior of the connecting part (103) form a protective cavity; The outer wall of the protective plate (201) is provided with heat dissipation grooves (203); The outer wall of the protective plate (201) is provided with a circular hole (204) through which the vent valve (109) passes; The outer wall of the protective plate (201) is fitted with a sealing shell (205) located outside the fixing ring (118).

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