Two-end supporting type centrifugal pump
By adopting a two-end support structure and maintenance window design in the centrifugal pump, the problem of difficulty in removing bearings and mechanical seals during maintenance is solved, and higher repairability and shorter maintenance time is achieved.
Patent Information
- Application Number
- CN202411677363.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-03-18
AI Technical Summary
During maintenance, the existing vertical lower inlet and side outlet single-stage single-suction centrifugal pumps have a high overall height and large weight, and it is difficult to remove the bearing, bearing body and mechanical seal without disassembling and moving the motor, which affects the replacement of mechanical seals.
The two-end support centrifugal pump structure is adopted, and the two bearing support points are arranged on both sides of the impeller, which shortens the length of the bearing body, reduces the volume and weight, and a maintenance window is set on the top plate of the pump body, allowing the bearing body, bearing and mechanical seal to be taken out without disassembling the motor.
It realizes the rapid removal and replacement of bearing body, bearing and mechanical seal without disassembling the drive motor, improves the maintenanceability of the centrifugal pump, shortens the maintenance time, and improves work efficiency.
Smart Images
Figure CN119641651A_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of centrifugal pumps, and in particular relates to a two-end supported centrifugal pump. Background Art
[0002] The bearing support of a vertical bottom-inlet and side-outlet single-stage single-suction centrifugal pump usually adopts a cantilever support structure, that is, both bearing support points are on one side of the impeller. The bottom-inlet and side-outlet refer to the position of the water inlet and outlet of the pump. Usually, the upper bearing adopts a pair of thrust angular contact ball bearings or tapered roller bearings as the first bearing, and the lower bearing adopts a cylindrical roller bearing or a deep groove ball bearing as the radial support bearing. Although this arrangement has the advantages of simple structure, mature technology, and very wide application. However, since the bearing body is an integral structure, the overall height of the bearing body is generally high and the weight is large. In special circumstances such as limited maintenance space and the motor cannot be removed during maintenance, it is not easy to remove the bearing and the bearing body, which in turn affects the replacement of the mechanical seal. Summary of the invention
[0003] Therefore, the technical problem to be solved by the present application is to provide a two-end supported centrifugal pump, which can remove the bearing, bearing body and mechanical seal without disassembling and moving the motor, thereby realizing the replacement of the mechanical seal.
[0004] In order to solve the above problems, the present application provides a two-end supported centrifugal pump, including a pump body, a cavity formed inside the pump body, the pump body including a bottom plate and a top plate, a water inlet is provided on the bottom plate, an impeller is provided at the water inlet, and the impeller is connected to the first end of the pump shaft; a first cylinder located in the cavity is provided on the bottom plate, and a second bearing is provided between the first cylinder and the impeller; a bearing bracket is provided on the top plate of the pump body, the bearing bracket is provided with the bearing body, a first bearing is installed in the bearing body, and the second end of the pump shaft extends to the outside of the pump body and passes through the first bearing.
[0005] Optionally, a limiting plate extending inward is provided at one end of the bearing body, and the limiting plate is used to support the first bearing to limit the axial freedom.
[0006] Optionally, the centrifugal pump further comprises a motor bracket, wherein the motor bracket is arranged on the top plate of the pump body, and an inspection window is arranged on the side wall of the motor bracket.
[0007] Optionally, a width W of the inspection window is greater than a width D1 of the bearing bracket and the bearing body.
[0008] Optionally, the centrifugal pump further comprises a driving motor, a motor shaft of the driving motor passes through the motor bracket, and the second end of the pump shaft is connected to the motor shaft via an intermediate coupling.
[0009] Optionally, the gap H between the motor shaft and the pump shaft is greater than the height H12 of the bearing bracket; the gap H between the motor shaft and the pump shaft is greater than the height H11 of the bearing body.
[0010] Optionally, the top plate of the pump body is at least partially bent into the cavity to form a second cylinder, and a mechanical seal is provided between the second cylinder and the pump shaft.
[0011] Optionally, the height of the mechanical seal is smaller than the gap H between the motor shaft and the pump shaft.
[0012] Optionally, the second cylinder, the first cylinder and the water inlet are coaxially arranged.
[0013] Optionally, the bearing bracket and the bearing body are located inside the motor bracket, and the motor bracket, the bearing bracket and the bearing body are coaxially arranged.
[0014] Beneficial Effects
[0015] The present application provides a two-end supported centrifugal pump, in which the two bearing support points are arranged on both sides of the impeller, which can effectively shorten the length of the bearing body, reduce the volume of the bearing body and the weight of a single piece, and can remove the bearing body, bearing and mechanical seal in a limited space without disassembling and moving the drive motor, thereby improving the maintainability of the centrifugal pump, shortening the repair and maintenance time, and greatly improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the structure of a two-end supported centrifugal pump according to an embodiment of the present application.
[0017] The reference numerals are as follows:
[0018] 1- pump body, 2- impeller, 3- bearing bracket, 4- bearing body, 5- motor bracket, 6- motor shaft, 7- intermediate coupling, 8- pump shaft, 9- first bearing, 10- mechanical seal, 11- second bearing, 12- maintenance window. DETAILED DESCRIPTION
[0019] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0021] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0022] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.
[0023] See also Figure 1 As shown, according to an embodiment of the present application, a two-end supported centrifugal pump is provided, including a pump body 1, a cavity is formed inside the pump body 1, the pump body 1 includes a bottom plate and a top plate, a water inlet is arranged on the bottom plate, an impeller 2 is arranged at the water inlet, and the impeller 2 is connected to the first end of the pump shaft 8; a first cylinder located in the cavity is arranged on the bottom plate, and a second bearing 11 is arranged between the first cylinder and the impeller 2; a bearing bracket 3 is arranged on the top plate of the pump body 1, a bearing body 4 is arranged on the bearing bracket 3, a first bearing 9 is installed in the bearing body 4, and the second end of the pump shaft 8 extends to the outside of the pump body 1 and passes through the first bearing 9.
[0024] Arranging the two bearing support points on both sides of the impeller can effectively shorten the length of the bearing body 4, reduce the volume of the bearing body 4 and the weight of a single piece, and can remove the bearing body 4, the bearing and the mechanical seal 10 in a limited space without disassembling and moving the drive motor, thereby improving the maintainability of the centrifugal pump, shortening the repair and maintenance time, and greatly improving work efficiency.
[0025] The weight of the main maintenance parts such as the bearing body 4, the bearing bracket 3, the first bearing 9 and the mechanical seal 10 is less than the lifting force from bottom to top by an adult's hands. That is to say, even without the help of special tools, the maintenance personnel can smoothly take out various parts, which meets the requirements of ergonomics.
[0026] Among them, a water inlet is arranged on the bottom plate, and a water outlet is arranged on one of the side plates connected to the bottom plate. That is to say, the water inlet of the pump body 1 is at the bottom of the pump body 1, and the water outlet is in the horizontal direction of the side of the pump body 1. The pumping medium is sucked in from the water inlet, pressurized by the impeller 2, and then pressed out from the water outlet.
[0027] Among them, the bearing bracket 3 is a hollow tube with a bracket connecting flange structure at both ends. The bearing bracket 3 is arranged on the top plate of the pump body 1, that is, the bearing bracket 3 is fixed to the top plate of the pump body 1 through the bracket connecting flange at one end thereof and bolts. Through the detachable connection method, the bearing bracket 3 is easy to remove from the top plate of the pump body 1, thereby improving the convenience of repair and maintenance.
[0028] Among them, the bearing body 4 is a hollow tube, and a bearing body connecting flange structure is provided at one end thereof. The through holes on the bearing body connecting flange correspond one to one with the through holes on the bracket connecting flange, so that the bearing body 4 can be fixed to the bearing bracket 3 by bolts. Through the detachable connection method, the installation and disassembly of the bearing body 4 on the bearing bracket 3 can be realized, thereby improving the convenience for maintenance.
[0029] A limiting plate extending inward is disposed at one end of the bearing body 4 , and the limiting plate is used to support the first bearing 9 to limit the axial freedom.
[0030] Among them, one end of the bearing body 4 is provided with a limit plate extending inward, which abuts against the outer ring of the first bearing 9 to support and limit the first bearing 9 to prevent the first bearing 9 from axial displacement when the centrifugal pump is working, thereby affecting the transmission accuracy.
[0031] Specifically, in order to improve the convenience of processing, the lower surface of the limiting plate is flush with the lower surface of the connecting flange of the bearing body.
[0032] Wherein, the first bearing 9 is a thrust bearing;
[0033] The second bearing 11 is a guide bearing, which is installed at the lower ring of the impeller 2 and provides radial support for the rotor composed of the impeller 2 and the pump shaft 8. At the same time, the traditional grease-lubricated rolling bearing is replaced by a medium-lubricated guide bearing to reduce the overall height of the bearing body.
[0034] In this embodiment, the guide bearing 11 is installed on the pump body 1. In other embodiments, it can also be installed on other stator structures as needed.
[0035] The guide bearing 11 may be made of a metal structure or a composite material according to different application environments.
[0036] The lower ring of impeller 2 is different from the traditional impeller structure in that the lower ring is lengthened for better support.
[0037] The centrifugal pump further comprises a motor bracket 5 , which is arranged on the top plate of the pump body 1 , and an inspection window 12 is arranged on the side wall of the motor bracket 5 .
[0038] The bearing body 4, the first bearing 9 and the mechanical seal 10 are all located in the chamber formed by the motor bracket 5. After the bearing body 4, the first bearing 9 and the mechanical seal 10 are disassembled, they need to be taken out through the inspection window 12 for repair and maintenance.
[0039] A sealing plate is also provided at the inspection window 12 to seal the bearing body 4, the first bearing 9 and the mechanical seal 10 in the chamber to prevent the medium from entering the chamber through the inspection window 12 when the centrifugal pump is working, causing the centrifugal pump to fail due to water ingress.
[0040] Among them, the motor bracket 5 is a structure with bracket connecting flanges at both ends of a hollow cylinder. The motor bracket 5 is fixed to the pump body 1 through the bracket connecting flange at one end and bolts. The detachable connection method facilitates the disassembly and installation of the motor bracket 5.
[0041] The width W of the inspection window 12 is greater than the width D1 of the bearing bracket 3 and the bearing body 4 .
[0042] The width D1 of the bearing bracket 3 and the bearing body 4 means that the widest parts of the bearing bracket 3 and the bearing body 4 are equal and are both D1.
[0043] After the bearing bracket 3 and the bearing body 4 are disassembled, it is necessary to ensure that the bearing bracket 3 and the bearing body 4 have sufficient strength and rigidity, and their width D1 is smaller than the width of the inspection window 12, so that the bearing bracket 3 and the bearing body 4 can be smoothly removed from the inspection window 12.
[0044] The centrifugal pump further comprises a driving motor, a motor shaft 6 of the driving motor passes through the motor bracket 5, and a second end of the pump shaft 8 is connected to the motor shaft 6 via an intermediate coupling.
[0045] The power is transmitted to the pump shaft 8 through the motor shaft 6, and then to the impeller 2; the second end of the pump shaft 8 is connected to the motor shaft 6 through an intermediate coupling. That is to say, when the mechanical seal 10 needs to be replaced or repaired, the intermediate coupling needs to be removed first to create a gap between the motor shaft 6 and the pump shaft 8, and the bearing body 4, the first bearing 9 and the mechanical seal 10 sleeved on the pump shaft 8 are disassembled from the gap and then taken out through the inspection window 12. The bearing body 4, the first bearing 9 and the mechanical seal 10 can be replaced or repaired without disassembling the drive motor.
[0046] The gap H between the motor shaft 6 and the pump shaft 8 is greater than the height H12 of the bearing bracket 3 ; the gap H between the motor shaft 6 and the pump shaft 8 is greater than the height H11 of the bearing body 4 .
[0047] Among them, the height H12 of the bearing bracket 3 is smaller than the gap H, and the bearing body 4 is smaller than the gap H. During maintenance, the bolts between the two can be disconnected and taken out in sections.
[0048] After the bearing bracket 3 and the bearing body 4 are disassembled, it is necessary to ensure that the bearing bracket 3 and the bearing body 4 have sufficient strength and rigidity, and the height H12 of the bearing bracket 3 is smaller than the gap H between the motor shaft 6 and the pump shaft 8, and the height H11 of the bearing body 4 is smaller than the gap H between the motor shaft 6 and the pump shaft 8, so as to ensure that the bearing bracket 3 and the bearing body 4 can be smoothly removed from the gap formed between the motor shaft 6 and the pump shaft 8, avoiding interference during disassembly and installation, and preventing installation or disassembly.
[0049] At least a portion of the top plate of the pump body 1 is bent into the cavity to form a second cylinder, and a mechanical seal 10 is provided between the second cylinder and the pump shaft 8 .
[0050] The mechanical seal 10 is provided to seal the interior of the pump body 1 cavity, thereby sealing the pumping medium in the pump body 1 cavity, thereby preventing the medium entering the cavity from the water inlet from leaking at the second cylinder and entering the chamber of the motor bracket, causing failure of the power part.
[0051] The mechanical seal 10 includes a sealing part and a connecting end. The sealing part is located between the second cylinder and the pump shaft 8. The lower surface of the sealing part is flush with the end surface of the second cylinder. A connecting end is arranged on the top of the sealing part. The connecting end is overlapped on the pump body 1 and fixed by bolts to install the mechanical seal 10 on the pump body 1.
[0052] The height of the mechanical seal 10 is smaller than the gap H between the motor shaft 6 and the pump shaft 8 .
[0053] The height of the mechanical seal 10 is smaller than the gap H between the motor shaft 6 and the pump shaft 8. That is to say, under the premise of ensuring the sealing ability of the mechanical seal 10, the mechanical seal 10 can be disassembled and installed through the gap H, so as to realize the repair and maintenance of the mechanical seal 10, and also avoid interference when installing and disassembling the mechanical seal 10.
[0054] The second cylinder, the first cylinder and the water inlet are coaxially arranged.
[0055] Among them, the second cylinder, the first cylinder and the water inlet are coaxially arranged, that is, to ensure that when the impeller 2 is connected to the pump shaft 8, the pump shaft 8 can be smoothly inserted into the connecting end of the impeller 2, thereby improving the installation efficiency and avoiding the problem of inconsistent rotation center.
[0056] The bearing bracket 3 and the bearing body 4 are located inside the motor bracket 5 , and the motor bracket 5 , the bearing bracket 3 and the bearing body 4 are coaxially arranged.
[0057] The motor bracket 5, the bearing bracket 3 and the bearing body 4 are coaxially arranged, that is, when the motor shaft 6 and the pump shaft 8 are connected, the two can be smoothly docked to avoid the problem of inconsistent rotation centers.
[0058] Compared with the traditional structure, the height of the parts that need to be repaired on the upper part of the pump body 1 is greatly reduced, and the first bearing and the mechanical seal can be repaired and replaced without removing the drive motor.
[0059] Compared with the traditional single-sided supported cantilever structure, the two-end supported structure adopted in the present application can provide more stable support for the pump rotor.
[0060] Compared with the traditional bearing body 4 structure, the weight of a single piece is reduced, and the pump can be repaired even without the aid of special tools. It has friendly human-machine interaction and high maintainability.
[0061] Compared with the traditional structure, adding a guide bearing at the impeller mouth ring not only reduces the mouth ring gap, but also lengthens the mouth ring length, enhances the throttling effect, and helps to improve the efficiency of the entire pump.
[0062] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.
[0063] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.
Claims
1. A two-end supported centrifugal pump, comprising a pump body (1), wherein a cavity is formed inside the pump body (1), wherein the pump body (1) comprises a bottom plate and a top plate, wherein a water inlet is arranged on the bottom plate, wherein an impeller (2) is arranged at the water inlet, and wherein the impeller (2) is connected to a first end of a pump shaft (8); characterized in that: A first cylinder located in the cavity is arranged on the bottom plate, and a second bearing (11) is arranged between the first cylinder and the impeller (2); a bearing bracket (3) is arranged on the top plate of the pump body (1), a bearing body (4) is arranged on the bearing bracket (3), a first bearing (9) is installed in the bearing body (4), and the second end of the pump shaft (8) extends to the outside of the pump body (1) and passes through the first bearing (9).
2. A two-end supported centrifugal pump according to claim 1, characterized in that: One end of the bearing body (4) is provided with a limiting plate extending inwardly, and the limiting plate is used to support the first bearing (9) to limit the axial degree of freedom.
3. A two-end supported centrifugal pump according to claim 1, characterized in that: The centrifugal pump further comprises a motor support (5), wherein the motor support (5) is arranged on the top plate of the pump body (1), and an inspection window (12) is arranged on the side wall of the motor support (5).
4. A two-end supported centrifugal pump according to claim 3, characterized in that: The width W of the inspection window (12) is greater than the width D1 of the bearing bracket (3) and the bearing body (4).
5. A two-end supported centrifugal pump according to claim 3, characterized in that: The centrifugal pump also includes a driving motor, a motor shaft (6) of the driving motor passes through the motor bracket (5), and the second end of the pump shaft (8) is connected to the motor shaft (6) via an intermediate coupling.
6. A two-end supported centrifugal pump according to claim 5, characterized in that: The gap H between the motor shaft (6) and the pump shaft (8) is greater than the height H12 of the bearing bracket (3); and the gap H between the motor shaft (6) and the pump shaft (8) is greater than the height H11 of the bearing body (4).
7. A two-end supported centrifugal pump according to claim 1, characterized in that: The top plate of the pump body (1) is at least partially bent into the cavity to form a second cylinder, and a mechanical seal (10) is provided between the second cylinder and the pump shaft (8).
8. A two-end supported centrifugal pump according to claim 7, characterized in that: The height of the mechanical seal (10) is smaller than the gap H between the motor shaft (6) and the pump shaft (8).
9. A two-end supported centrifugal pump according to claim 7, characterized in that: The second cylinder, the first cylinder and the water inlet are coaxially arranged.
10. A two-end supported centrifugal pump according to claim 3, characterized in that: The bearing bracket (3) and the bearing body (4) are located inside the motor bracket (5), and the motor bracket (5), the bearing bracket (3) and the bearing body (4) are coaxially arranged.