Centrifugal pump sealing structure and centrifugal pump

Abstract

The invention is suitable for the technical field of centrifugal pumps, and provides a centrifugal pump sealing structure which comprises a sealing assembly, the sealing assembly comprises a locking sealing sleeve part and a sealing rotating part, a tight air bag is laid on the inner wall of the locking sealing sleeve part, and a plurality of sealing partition rings are arranged on the tight air bag; an annular groove is formed in a rotating shaft included in the rotating shaft assembly, a plurality of partition grooves are formed in the annular groove, and the tight air bag is inflated, filled and locked into the annular groove, so that staggered-layer locking and sealing are completed. When the tight air bag is inflated, the multiple sealing partition rings are driven to be sequentially inserted and locked into the multiple partition grooves, and secondary staggered layer locking sealing is carried out. Multiple times of sequential staggered-layer progressive locking sealing are achieved, and the sealing problem of an existing sealing structure in the assembling process except for self sealing is solved; the tight air bag and the elasticity of the multiple sealing partition rings driven by the tight air bag can elastically cope with the long-term vibration working environment of the centrifugal pump in good time, so that stable sealing at the assembly position for a long time is facilitated.

Description

Technical Field

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

[0002] The centrifugal pump works by rotating the impeller to make the water centrifugal. Before starting the pump, the pump casing and the suction pipe must be filled with water, and then the motor is started to make the pump shaft drive the impeller and water to rotate at high speed. The water undergoes centrifugal motion and is thrown to the outer edge of the impeller, and flows into the water pressure pipeline of the water pump through the flow channel of the volute pump casing. The basic structure of a centrifugal pump consists of six parts, namely the impeller, pump body, pump shaft, bearing, sealing ring and stuffing box.

[0003] The sealing ring plays a vital role in the use of centrifugal pumps. If there is a problem with the sealing of the centrifugal pump, the liquid transported in the pump may leak from the seal (such as mechanical seal or packing seal) to the external environment, causing environmental pollution, especially when transporting toxic, corrosive or dangerous media (such as acids, alkalis, oils), which may pollute the soil or water sources; the leakage of flammable and explosive media may cause fire or explosion; corrosive liquids may damage equipment or endanger personnel safety; leakage leads to medium loss and increases operating costs. In the case of internal leakage, poor sealing may cause the medium inside the pump to flow back, reducing the efficiency of the pump.

[0004] There are two types of sealing methods for existing centrifugal pumps: shaft seals (dynamic seals) and static seals. Even if the sealing effect is very good, there is still a narrow gap at the connection with the rotating shaft, which will cause the sealing effect to deteriorate during the long-term vibration of the centrifugal pump. For example, the "integrated rotary seal assembly" recorded in the prior art "A high-efficiency sealed vertical centrifugal pump, Chinese patent, authorization announcement number CN118654000B" connects the shaft sleeve part to the output shaft through a fixing ring. Although the "integrated rotary seal assembly" itself has a very good sealing effect, there is still a narrow gap at the connection with the shaft sleeve and the output shaft, which will cause the sealing effect to deteriorate during the long-term vibration of the centrifugal pump. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a centrifugal pump sealing structure and a centrifugal pump, aiming to solve the problem that although the existing technology of centrifugal pump sealing has a very good sealing effect, there is also a narrow gap at the connection with the rotating shaft, which will cause the sealing effect to deteriorate due to the vibration of the centrifugal pump during long-term operation.

[0006] Specifically: A centrifugal pump sealing structure, including a sealing assembly, the sealing assembly includes a locking sealing kit and a sealing rotating part, the locking sealing kit and the sealing rotating part are rotationally assembled and used for rotating sealing assembly; the locking sealing kit is used to be assembled on the rotating shaft assembly; the locking sealing kit is paved with a tight airbag on its inner wall, and a plurality of sealing partition rings are arranged on the tight airbag, and the plurality of sealing partition rings are evenly distributed on the tight airbag along the column direction of the rotating shaft assembly; the rotating shaft assembly is provided with an annular groove on the rotating shaft contained therein, the annular groove is used to match and accommodate the tight airbag, and a plurality of partition grooves are arranged on the annular groove, and the plurality of partition grooves are evenly distributed on the annular groove along the column direction of the rotating shaft, and the plurality of partition grooves are in a one-to-one correspondence with the plurality of sealing partition rings; the tight airbag is inflated so that the tight airbag is filled and locked inside the annular groove to complete the staggered locking seal; while the tight airbag is inflated, the plurality of sealing partition rings are driven to be inserted and locked into the plurality of partition grooves in sequence to perform secondary staggered locking seal.

[0007] The sealing assembly is assembled by rotating the seal between the locking seal kit and the sealing rotating part, so as to provide a seal for the rotating shaft assembly as a whole. Thereafter, in the process of the rotating shaft being inserted and assembled inside the locking seal kit, the tight airbag is inflated, and the tight airbag expands and fills the inside of the annular groove, and is tightly closed against the outer wall of the rotating shaft locked inside the annular groove, completing the first staggered locking seal; at the same time, in the process of the tight airbag being inflated and expanded, it will drive multiple sealing partition rings to advance in the direction of multiple partition grooves, so that multiple sealing partition rings are inserted and locked into multiple partition grooves in turn, and the second staggered locking seal is performed; through the cooperation of the tight airbag, multiple sealing partition rings and multiple partition grooves, multiple staggered progressive locking seals are achieved in sequence, which solves the sealing problem of the existing sealing structure during assembly except for its own sealing. At the same time, the elasticity of the tight airbag and the multiple sealing partition rings driven by the tight airbag can achieve timely elasticity to cope with the long-term vibration working environment of the centrifugal pump, so as to achieve stable sealing at the assembly point for a long time.

[0008] The technical solution of this application is further described below: In one embodiment, the locking seal kit includes: A locking sealing sleeve, wherein the locking sealing sleeve is used to be sleeved on the outside of the rotating shaft at the annular groove, and the tight airbag is laid on the inner wall of the locking sealing sleeve; The valve core A is assembled on the locking and sealing sleeve and is connected to the tight air bag; The locking sleeve is installed at the end of the locking sealing sleeve. The locking sleeve and the locking sealing sleeve are in a through shape. The column center line of the locking sleeve and the column center line of the locking sealing sleeve are on the same straight line.

[0009] Furthermore, the shaft assembly also includes: An output shaft, wherein the output shaft is assembled on the centrifugal pump; The connecting disk is assembled between the output shaft and the rotating shaft, and is used for detachable assembly between the output shaft and the rotating shaft; wherein the connecting disk comprises a connecting disk body A and a connecting disk body B, and the connecting disk body A and the connecting disk body B are assembled by multiple fixing bolts.

[0010] Furthermore, the rotating shaft is provided with a plurality of mounting holes at both ends thereof, and the plurality of mounting holes and the locking sleeve are mounted via a plurality of bolts.

[0011] Furthermore, the sealing isolation ring includes: A plurality of arc-shaped plates, wherein the plurality of arc-shaped plates are arranged in a ring array and are distributed against each other; the plurality of arc-shaped plates are all connected to the tight airbag; A plurality of telescopic rods are provided, and the plurality of telescopic rods are in one-to-one correspondence with the plurality of arc plates; one end of the telescopic rod is fixed on the arc plate, and the other end is fixed on the inner wall of the locking sealing sleeve; the telescopic rod comprises a receiving tube and an interpenetrating column which is movably inserted into the receiving tube.

[0012] When the tight airbag is inflated, it will drive multiple sealing partition rings to advance in the direction of multiple partition grooves. During this process, multiple arc plates are separated from each other and guided by the extension of telescopic rods to approach the partition grooves, so that multiple arc plates are arranged in a circular array inside the partition groove and are distributed against each other, so that multiple sealing partition rings can be accurately inserted and locked into the multiple partition grooves in sequence, and a second staggered locking seal is performed.

[0013] In one embodiment, the sealing rotating member includes An inner sealing ring, wherein the inner sealing ring is integrally sleeved and fixed on the outer wall of the locking sealing kit; An outer sealing ring, wherein the outer sealing ring is movably sleeved outside the inner sealing ring; The bearing is installed between the outer sealing ring and the inner sealing ring to provide a rotating connection medium for the rotating assembly of the outer sealing ring and the inner sealing ring; the outer sealing ring and the inner sealing ring cooperate to provide a sealed rotating assembly at the bearing rotation point.

[0014] Furthermore, the outer sealing ring is provided with a positioning annular cavity A inside thereof.

[0015] Furthermore, the inner sealing ring includes: An inner sealing ring body, wherein the inner sealing ring body is integrally sleeved and fixed on the outer wall of the locking sealing kit; The sealing ring body comprises a supporting ring body distributed vertically and a supporting ring body distributed horizontally; one end of the supporting ring body is integrally fixed to the inner sealing ring body, and the other end is integrally fixed to the supporting ring body; the supporting ring body movably abuts against the outer sealing ring inside the positioning annular cavity A; A plurality of material-diverting plates are arranged in an annular array on the inner wall of the ring body, and a wedge-shaped surface is formed on the material-diverting plates.

[0016] Therefore, after the rotating shaft is inserted and assembled inside the locking sealing kit, when in use, the rotating shaft will drive the inner sealing ring to rotate through the locking sealing kit, and the inner sealing ring will drive the abutting ring body against the outer sealing ring inside the positioning annular cavity A to rotate through the inner sealing ring body. In this process, the rotating multiple material stripping plates will use the wedge-shaped surfaces to push the material outward to prevent the material from entering the sealing rotating part through the gap between the abutting ring body and the outer sealing ring, so as to improve the sealing performance of the sealing assembly. Even when a large gap appears during long-term vibration operation of the centrifugal pump, the multiple material stripping plates can use the wedge-shaped surfaces to push the material outward to prevent leakage.

[0017] The positioning annular cavity A is provided with abutting airbag A inside, and the abutting airbag A is located in the middle position of the connection between the positioning annular cavity A and the bearing; the abutting airbag A is not connected to the bearing; the inner sealing ring body is provided with a positioning annular cavity B at its outer edge, and the positioning annular cavity B is used for inserting and installing the bearing; the positioning annular cavity B is provided with an abutting airbag B on its upper and lower sides respectively; the abutting airbag B is located in the gap left between the positioning annular cavity B and the bearing; the inner sealing ring body and the sealing ring body are both provided with valve cores B, and the valve cores B are used to inflate and deflate the abutting airbags A and B. After the rotating shaft is inserted and assembled inside the locking seal kit, when not in use, the abutting airbags A and B are inflated through the valve cores B, and after the abutting airbags A and B are expanded, they are abutted against the bearing to seal and lock the bearing, so as to avoid leakage problems when not in use after a large gap appears during the long-term vibration operation of the centrifugal pump.

[0018] Another object of the present invention is to provide a centrifugal pump, comprising: A motor, the motor being used to provide power; A plurality of connecting frames, wherein the connecting frames are arranged in an array on the housing of the motor; The pump body is installed on the end of the connecting frame; any of the centrifugal pump sealing structures described above is installed between the motor and the pump body, one end of the shaft assembly is connected to the motor by power transmission, and the other end is connected to the pump body by power transmission.

[0019] Compared with the prior art, the present invention can achieve: 1. The sealing assembly is assembled by rotating the seal between the locking seal kit and the sealing rotating member, so as to provide a seal for the rotating shaft assembly as a whole. Thereafter, during the process of the rotating shaft being inserted and assembled inside the locking seal kit, the tight airbag is inflated, and the tight airbag expands and fills the inside of the annular groove, and is tightly closed against the outer wall of the rotating shaft locked inside the annular groove, thereby completing the first staggered locking seal. At the same time, during the process of the tight airbag being inflated and expanded, multiple sealing partition rings are driven to advance in the direction of multiple partition grooves, so that multiple sealing partition rings are sequentially inserted and locked inside multiple partition grooves, thereby performing the second staggered locking seal. Through the tight airbag, multiple sealing partition rings and multiple partition grooves, multiple staggered progressive locking seals are achieved, which solves the sealing problem of the existing sealing structure during assembly in addition to its own sealing. At the same time, the tight airbag and the elasticity of multiple sealing partition rings driven by the tight airbag can achieve timely elasticity to cope with the long-term vibration working environment of the centrifugal pump, so as to achieve stable sealing at the assembly point for a long time; 2. After the rotating shaft is inserted and assembled inside the locking seal kit, when in use, the rotating shaft will drive the inner sealing ring to rotate through the locking seal kit, and the inner sealing ring will drive the abutting ring body abutting against the outer sealing ring inside the positioning annular cavity A to rotate through the inner sealing ring body. During this process, the rotating multiple material-push-plates will use the wedge-shaped surface to push the material outward to prevent the material from entering the sealing rotating part through the gap between the abutting ring body and the outer sealing ring, so as to improve the sealing performance of the sealing assembly. Even if a large gap appears during the long-term vibration operation of the centrifugal pump, the multiple material-push-plates can use the wedge-shaped surface to push the material outward to avoid leakage. 3. After the rotating shaft is inserted and assembled inside the locking sealing kit, when not in use, the abutment airbags A and B are inflated through the valve core B. After the abutment airbags A and B are expanded, they abut against the bearing to seal and lock the bearing, avoiding leakage problems when not in use after large gaps appear during long-term vibration operation of the centrifugal pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a structural schematic diagram of the centrifugal pump of the present invention; Figure 2 for Figure 1 Structural diagram of the sealing structure of a centrifugal pump; Figure 3 for Figure 2 Schematic diagram of the assembly structure of the central shaft assembly and the locking seal kit; Figure 4 for Figure 3Structural schematic diagram of the center locking seal kit; Figure 5 for Figure 4 A schematic cross-sectional view of the center locking seal kit; Figure 6 for Figure 5 The enlarged structural diagram at A in the middle; Figure 7 for Figure 3 A schematic cross-sectional structure diagram of ; Figure 8 for Figure 7 The enlarged structural diagram at B in the middle; Fig. 9 for Figure 2 A schematic diagram of the structure of the rotating shaft assembly; Fig.10 for Figure 2 A schematic diagram of the structure of the middle seal rotating part; Fig.11 is an exploded view of the sealing rotating part in 10; Fig.12 for Fig.10 A schematic cross-sectional view of the middle seal rotating member; Fig.13 for Fig.12 The enlarged structural diagram at C in the middle; Fig.14 for Fig.11 Structural schematic diagram of the middle and inner sealing ring; Fig.15 for Fig.11 Schematic diagram of the structure of the middle and outer sealing rings.

[0021] The codes in the attached drawings are: 1 is the motor; 2 is a connecting frame; 3 is a sealing assembly; locking sealing kit 100, locking sleeve 110, valve core A120, locking sealing sleeve 130, tight airbag 140, sealing partition ring 150 (telescopic rod 1501, arc plate 1502); sealing rotating member 200; outer sealing ring 210, inner sealing ring 220, bearing 230; abutting airbag A2101, positioning annular cavity A2102; sealing ring body 2201, inner sealing ring body 2202, valve core B2203, material stripping plate 2204, abutting airbag B2205, positioning annular cavity B2206; 4 is a pump body; 5 is a shaft assembly; output shaft 51, connecting plate 52, shaft 53, annular groove 54, partition groove 55, mounting hole 56. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The specific implementation of the present invention is described in detail below in conjunction with the specific embodiments.

[0023] In the embodiment of the present invention, Figure 2-Figure 9 As shown: a centrifugal pump sealing structure, including a sealing assembly 3, wherein the sealing assembly 3 includes a locking sealing assembly 100 and a sealing rotating member 200, wherein the locking sealing assembly 100 and the sealing rotating member 200 are rotationally assembled and used for rotating sealing assembly; the locking sealing assembly 100 is used to be assembled on the rotating shaft assembly 5; The locking seal kit 100 is provided with a tight airbag 140 (the tight airbag 140 is cylindrical) on its inner wall, and a plurality of sealing partition rings 150 are provided on the tight airbag 140. The plurality of sealing partition rings 150 are evenly spaced and distributed on the tight airbag 140 along the column direction of the rotating shaft assembly 5. It should be explained here that the material of the tight airbag 140 can be rubber, or a composite material of rubber and other materials, etc., which are all existing technologies, and there is no restriction on the specific material, as long as it can meet the elastic expansion and contraction requirements; at the same time, it can be directly purchased on the market, and there are related descriptions in corresponding journals and documents, which are not what the present invention wants to protect, and will not be elaborated here; The rotating shaft assembly 5 includes a rotating shaft 53, on which an annular groove 54 is provided. The annular groove 54 is used to match and accommodate the compact airbag 140. The annular groove 54 is provided with a plurality of partition grooves 55. The plurality of partition grooves 55 are evenly spaced and distributed on the annular groove 54 along the column direction of the rotating shaft 53. The plurality of partition grooves 55 correspond to the plurality of sealing partition rings 150 in a one-to-one manner. Inflate the tight airbag 140 so that it is filled and locked inside the annular groove 54 to complete the staggered locking seal; while the tight airbag 140 is inflated, it drives multiple sealing partition rings 150 to be inserted and locked into multiple partition grooves 55 in sequence to perform secondary staggered locking seal.

[0024] Therefore, although the existing technology for centrifugal pump sealing has a very good sealing effect, there is also a narrow gap at the connection with the rotating shaft, which will cause the sealing effect to deteriorate during the vibration of the centrifugal pump during long-term operation; the present application can achieve: The sealing assembly 3 is rotated and sealed between the locking sealing kit 100 and the sealing rotating member 200 to provide a seal for the rotating shaft assembly 5 as a whole. Thereafter, during the process of the rotating shaft 53 being inserted and assembled inside the locking sealing kit 100, the tight airbag 140 is inflated, and the tight airbag 140 expands and fills the inside of the annular groove 54, and is tightly closed against the outer wall of the rotating shaft 53 locked inside the annular groove 54, completing the first staggered locking seal; at the same time, during the process of the tight airbag 140 being inflated and expanded, it will drive multiple sealing partition rings 150 to multiple partition grooves 5 5 directions are advanced, so that multiple sealing partition rings 150 are inserted and locked into multiple partition grooves 55 in turn, and a second staggered locking seal is performed; through the tight airbag 140, multiple sealing partition rings 150 and multiple partition grooves 55, multiple staggered progressive locking seals are achieved in turn, which solves the sealing problem of the existing sealing structure during assembly in addition to its own sealing. At the same time, the elasticity of the tight airbag 140 and the tight airbag 140 driving the multiple sealing partition rings 150 can achieve timely elasticity to cope with the long-term vibration working environment of the centrifugal pump, so as to ensure stable sealing at the assembly point for a long time.

[0025] In the embodiment of the present invention, Figure 3-Figure 8 As shown: the locking seal kit 100 includes: A locking sealing sleeve 130, wherein the locking sealing sleeve 130 is used to be sleeved on the outside of the rotating shaft 53 at the annular groove 54, and the tight airbag 140 is laid on the inner wall of the locking sealing sleeve 130; The valve core A120 is assembled on the locking and sealing sleeve 130 and communicated with the tight air bag 140; The locking sleeve 110 is installed at the end of the locking sealing sleeve 130. The locking sleeve 110 and the locking sealing sleeve 130 are in a through shape. The column center line of the locking sleeve 110 and the column center line of the locking sealing sleeve 130 are on the same straight line.

[0026] It should be noted that the valve core A120 is used to inflate and deflate the tight airbag 140 so as to ensure the stability of the elastic seal of the tight airbag 140; at the same time, the valve core A120 belongs to the existing technology and can be purchased directly on the market, or can be found through literature and encyclopedias, so it will not be elaborated here.

[0027] In the embodiment of the present invention, Figure 3 and Fig. 9 As shown: the rotating shaft assembly 5 also includes: An output shaft 51, wherein the output shaft 51 is assembled on a centrifugal pump; The connecting disk 52 is assembled between the output shaft 51 and the rotating shaft 53, and is used for detachable assembly between the output shaft 51 and the rotating shaft 53; wherein the connecting disk 52 includes a connecting disk body A and a connecting disk body B, and the connecting disk body A and the connecting disk body B are assembled by multiple fixing bolts.

[0028] Further, such as Figure 2 , Figure 3 and Fig. 9 As shown, the rotating shaft 53 is provided with a plurality of mounting holes 56 at both ends thereof, and the plurality of mounting holes 56 are mounted to the locking sleeve 110 via a plurality of bolts.

[0029] Therefore, the shaft 53 assembles the connecting disc body A and the connecting disc body B together through a plurality of fixing bolts. When the shaft 53 is inserted and assembled inside the locking seal kit 100, the plurality of bolts and the plurality of mounting holes 56 are used to cooperate with the locking sleeve 110 for locking.

[0030] In the embodiment of the present invention, Figure 5-Figure 8 As shown: the sealing isolation ring 150 includes: A plurality of arc plates 1502, wherein the plurality of arc plates 1502 are arranged in a circular array and are distributed against each other; the plurality of arc plates 1502 are all connected to the tight airbag 140; A plurality of telescopic rods 1501 are provided, and the plurality of telescopic rods 1501 are in one-to-one correspondence with the plurality of arc plates 1502; one end of the telescopic rod 1501 is fixed on the arc plate 1502, and the other end is fixed on the inner wall of the locking sealing sleeve 130; the telescopic rod 1501 includes a storage tube and an interpenetrating column movably inserted into the storage tube.

[0031] Therefore, when the tight airbag 140 is inflated, it will drive multiple sealing partition rings 150 to advance in the direction of multiple partition grooves 55. During this process, multiple arc plates 1502 are separated from each other and guided by the extension of the telescopic rod 1501 to approach the partition groove 55, so that multiple arc plates 1502 are arranged in a circular array inside the partition groove 55 and are distributed against each other, so that multiple sealing partition rings 150 can be accurately inserted and locked into the multiple partition grooves 55 in sequence, and a second staggered locking seal is performed.

[0032] It should be noted that: an anti-falling protrusion is provided at the end of the insertion column, which is used to prevent the insertion column from falling off from the inside of the storage tube. The storage tube and the insertion column are also prior arts, and their detailed structures can be found in existing literature journals. They can also be purchased directly on the market, or parts can be purchased on the market to assemble them, etc.; they are not what the present invention wants to protect and will not be elaborated here.

[0033] In the embodiment of the present invention, Figure 2 , Figure 10-12As shown: the sealing rotating member 200 includes An inner sealing ring 220, wherein the inner sealing ring 220 is integrally sleeved and fixed on the outer wall of the locking sealing kit 100; An outer sealing ring 210, wherein the outer sealing ring 210 is movably sleeved outside the inner sealing ring 220; The bearing 230 is installed between the outer sealing ring 210 and the inner sealing ring 220 to provide a rotating connection medium for the rotating assembly of the outer sealing ring 210 and the inner sealing ring 220; the outer sealing ring 210 and the inner sealing ring 220 cooperate to provide a sealed rotating assembly at the rotating point of the bearing 230.

[0034] It should be noted that bearing 230 is a prior art, and its detailed structure can be found in existing literature journals. It can also be purchased directly on the market, or its components can be purchased on the market to assemble it, etc. It is not what the present invention wants to protect and will not be elaborated here.

[0035] Further, such as Fig.12 , Fig.13 and Fig.15 As shown: the outer sealing ring 210 has a positioning annular cavity A2102 opened inside it.

[0036] Further, such as Figure 12-14 As shown: the inner sealing ring 220 includes: An inner sealing ring body 2202, wherein the inner sealing ring body 2202 is integrally sleeved and fixed on the outer wall of the locking sealing kit 100; The sealing ring body 2201 includes a supporting ring body distributed vertically and a supporting ring body distributed horizontally; one end of the supporting ring body is integrally fixed to the inner sealing ring body 2202, and the other end is integrally fixed to the supporting ring body; the supporting ring body movably abuts against the outer sealing ring 210 inside the positioning annular cavity A2102; A plurality of material-shifting plates 2204 are arranged in a ring array on the inner wall of the ring body, and a wedge-shaped surface is formed on the material-shifting plates 2204 .

[0037] Therefore, after the rotating shaft 53 is inserted and assembled inside the locking sealing kit 100, when in use, the rotating shaft 53 will drive the inner sealing ring 220 to rotate through the locking sealing kit 100, and the inner sealing ring 220 will drive the abutting ring body on the outer sealing ring 210 inside the positioning annular cavity A2102 to rotate through the inner sealing ring body 2202. During this process, the rotating multiple material removal plates 2204 will use the wedge-shaped surface to push the material outward to prevent the material from entering the sealing rotating part 200 through the gap between the abutting ring body and the outer sealing ring 210, so as to improve the sealing performance of the sealing assembly 3. Even when a large gap appears during the long-term vibration operation of the centrifugal pump, the multiple material removal plates 2204 can use the wedge-shaped surface to push the material outward to prevent leakage.

[0038] In the embodiment of the present invention, Figure 12-Figure 15 As shown: the positioning annular cavity A2102 is provided with abutting airbag A2101 inside thereof, and the abutting airbag A2101 is located in the middle position of the connection between the positioning annular cavity A2102 and the bearing 230; the abutting airbag A2101 is not connected to the bearing 230; The inner sealing ring body 2202 is provided with a positioning annular cavity B2206 at its outer edge, and the positioning annular cavity B2206 is used for inserting and installing the bearing 230; the positioning annular cavity B2206 is provided with a supporting airbag B2205 on its upper and lower sides respectively; the supporting airbag B2205 is located at the gap between the positioning annular cavity B2206 and the bearing 230; The inner sealing ring body 2202 and the sealing ring body 2201 are both installed with valve cores B2203, and the valve cores B2203 are used to inflate and deflate the abutting airbags A2101 and B2205.

[0039] Therefore, after the rotating shaft 53 is inserted and assembled inside the locking sealing kit 100, when not in use, the abutting airbags A2101 and B2205 are inflated through the valve core B2203. After the abutting airbags A2101 and B2205 are expanded, they abut against the bearing 230, so as to seal and lock the bearing 230, thereby avoiding leakage problems when the centrifugal pump is not in use due to large gaps caused by long-term vibration operation.

[0040] Another object of the present invention is to provide a centrifugal pump, such as Figure 1 and Figure 2 Shown: Included: A motor 1, wherein the motor 1 is used to provide power; A plurality of connecting frames 2, wherein the connecting frames 2 are distributed in an array on the housing of the motor 1; The pump body 4 is installed on the end of the connecting frame 2; any of the centrifugal pump sealing structures described above is installed between the motor 1 and the pump body 4, one end of the shaft assembly 5 is connected to the motor 1 by power transmission, and the other end is connected to the pump body 4 by power transmission.

[0041] It should be noted that the pump body 4 is a prior art, and its detailed structure can be found in existing literature journals. It can also be purchased directly on the market, or its components can be purchased on the market to form it, etc. It is not what the present invention wants to protect, so it will not be elaborated here, and its internal structure is not drawn in the accompanying drawings.

[0042] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0043] In the description of the present invention, although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A centrifugal pump sealing structure, characterized in that: The invention comprises a sealing assembly (3), wherein the sealing assembly (3) comprises a locking sealing assembly (100) and a sealing rotating member (200), wherein the locking sealing assembly (100) and the sealing rotating member (200) are rotationally assembled and used for rotating sealing assembly; the locking sealing assembly (100) is used for being assembled on a rotating shaft assembly (5); The locking seal kit (100) has a tight airbag (140) laid on its inner wall, and a plurality of sealing partition rings (150) are arranged on the tight airbag (140). The plurality of sealing partition rings (150) are evenly spaced and distributed on the tight airbag (140) along the column direction of the rotating shaft assembly (5); The rotating shaft assembly (5) includes a rotating shaft (53) provided with an annular groove (54), the annular groove (54) being used to match and accommodate a compact airbag (140), the annular groove (54) being provided with a plurality of partition grooves (55), the plurality of partition grooves (55) being distributed at equal intervals on the annular groove (54) along the column direction of the rotating shaft (53), and the plurality of partition grooves (55) being in one-to-one correspondence with the plurality of sealing partition rings (150); The tight airbag (140) is inflated so that the tight airbag (140) is filled and locked inside the annular groove (54) to complete the staggered locking seal; while the tight airbag (140) is inflated, multiple sealing partition rings (150) are driven to be inserted and locked into multiple partition grooves (55) in sequence to perform secondary staggered locking seal.

2. A centrifugal pump sealing structure according to claim 1, characterized in that: The locking seal kit (100) comprises: A locking sealing sleeve (130), wherein the locking sealing sleeve (130) is used to be sleeved on the outside of the rotating shaft (53) at the annular groove (54), and the tight air bag (140) is laid on the inner wall of the locking sealing sleeve (130); A valve core A (120), the valve core A (120) being assembled on a locking sealing sleeve (130) and connected to a tight air bag (140); A locking sleeve (110) is mounted on the end of a locking sealing sleeve (130), the locking sleeve (110) and the locking sealing sleeve (130) are in a through-connected state, and the column center line of the locking sleeve (110) and the column center line of the locking sealing sleeve (130) are on the same straight line.

3. A centrifugal pump sealing structure according to claim 2, characterized in that: The rotating shaft assembly (5) further comprises: An output shaft (51), wherein the output shaft (51) is assembled on the centrifugal pump; A connecting disc (52) is assembled between the output shaft (51) and the rotating shaft (53) and is used for detachable assembly between the output shaft (51) and the rotating shaft (53); wherein the connecting disc (52) comprises a connecting disc body A and a connecting disc body B, and the connecting disc body A and the connecting disc body B are assembled by a plurality of fixing bolts.

4. A centrifugal pump sealing structure according to claim 3, characterized in that: The rotating shaft (53) is provided with a plurality of mounting holes (56) at both ends thereof, respectively, and the plurality of mounting holes (56) and the locking sleeve (110) are mounted via a plurality of bolts.

5. A centrifugal pump sealing structure according to claim 2, characterized in that: The sealing isolation ring (150) comprises: A plurality of arc-shaped plates (1502), wherein the plurality of arc-shaped plates (1502) are arranged in a ring array and are distributed against each other; the plurality of arc-shaped plates (1502) are all connected to the tight airbag (140); A plurality of telescopic rods (1501), wherein the plurality of telescopic rods (1501) are in one-to-one correspondence with the plurality of arc-shaped plates (1502); one end of the telescopic rod (1501) is fixed to the arc-shaped plate (1502), and the other end is fixed to the inner wall of the locking sealing sleeve (130); the telescopic rod (1501) comprises a storage tube and an interpenetrating column movably inserted into the interior of the storage tube.

6. A centrifugal pump sealing structure according to claim 1, characterized in that: The sealing rotating member (200) comprises An inner sealing ring (220), the inner sealing ring (220) being integrally sleeved and fixed on the outer wall of the locking sealing kit (100); An outer sealing ring (210), the outer sealing ring (210) being movably sleeved outside the inner sealing ring (220); A bearing (230) is installed between an outer sealing ring (210) and an inner sealing ring (220) and is used to provide a rotating connection medium for the rotating assembly of the outer sealing ring (210) and the inner sealing ring (220); the outer sealing ring (210) and the inner sealing ring (220) are used in conjunction with each other to provide a sealed rotating assembly at a rotating point of the bearing (230).

7. A centrifugal pump sealing structure according to claim 6, characterized in that: The outer sealing ring (210) is provided with a positioning annular cavity A (2102) inside.

8. A centrifugal pump sealing structure according to claim 7, characterized in that: The inner sealing ring (220) comprises: An inner sealing ring body (2202), the inner sealing ring body (2202) being integrally sleeved and fixed on the outer wall of the locking sealing kit (100); A sealing ring body (2201), the sealing ring body (2201) comprising a supporting ring body distributed vertically and a resisting ring body distributed horizontally; one end of the supporting ring body is integrally fixed to the inner sealing ring body (2202), and the other end is integrally fixed to the resisting ring body; the resisting ring body movably resists against the outer sealing ring (210) inside the positioning annular cavity A (2102); A plurality of material shifting plates (2204) are distributed in an annular array on the inner wall of the ring body, and a wedge-shaped surface is provided on the material shifting plates (2204).

9. A centrifugal pump sealing structure according to claim 8, characterized in that: The positioning annular cavity A (2102) is provided with an abutting airbag A (2101) inside thereof, and the abutting airbag A (2101) is located in the middle of the connection between the positioning annular cavity A (2102) and the bearing (230); the abutting airbag A (2101) is not connected to the bearing (230); The inner sealing ring body (2202) is provided with a positioning annular cavity B (2206) at its outer edge, and the positioning annular cavity B (2206) is used for inserting and installing the bearing (230); the positioning annular cavity B (2206) is provided with a supporting airbag B (2205) on its upper and lower sides respectively; the supporting airbag B (2205) is located at the gap left between the positioning annular cavity B (2206) and the bearing (230); The inner sealing ring body (2202) and the sealing ring body (2201) are both provided with a valve core B (2203), and the valve core B (2203) is used to inflate and deflate the abutting airbag A (2101) and the abutting airbag B (2205).

10. A centrifugal pump, characterized in that: include: A motor (1), wherein the motor (1) is used to provide power; A plurality of connecting frames (2), wherein the plurality of connecting frames (2) are distributed in an array on the housing of the motor (1); A pump body (4), wherein the pump body (4) is mounted on the end of the connecting frame (2); the centrifugal pump sealing structure described in any one of claims 1 to 9 is mounted between the motor (1) and the pump body (4), and one end of the shaft assembly (5) is connected to the motor (1) by power transmission, and the other end is connected to the pump body (4) by power transmission.

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