Segmented modular self-balancing multi-stage centrifugal pump

Abstract

The present application belongs to the technical field of multistage centrifugal pump, and particularly relates to a sectional combination type self-balancing multistage centrifugal pump, which comprises a front section, a middle section and a rear section; the front section comprises a first sleeve, a pump cover with a water inlet hole, a first connecting end plate, a first rotating shaft, a front plug-in slot, a shaft flow type lifting stirring head, a first impeller and a first guide vane; the middle section comprises a second sleeve, a second connecting end plate, a second rotating shaft, a plug-in column, a second rotating shaft, a second impeller, a second guide vane, a limiting frame, an isolation frame and a drainage elbow; and the rear section comprises a shell, a third connecting end plate, a double-shaft motor, a clamping shaft, a rear clamping slot and a cooling fan. The pump body is divided into the front section, the middle section and the rear section, so that the machining difficulty is reduced and the overall quality of the pump body is improved; the communication of the rotor components of the impellers at all stages is realized through the internal structure of the rotating shaft, so that the risk of wear or even seizure at the small gap of the dynamic and static friction pairs caused by the natural deflection of the slender rotor of the horizontal multistage pump under the action of gravity is reduced.

Description

Technical Field

[0001] This invention belongs to the field of multistage centrifugal pump technology, specifically relating to a segmented combined self-balancing multistage centrifugal pump. Background Technology

[0002] The self-balancing multistage pump is a new alternative product developed to address the problems of low efficiency and short service life caused by the wear of the flat disc or balancing drum mechanism in traditional multistage pumps. It has symmetrically arranged impeller rotor components, and the axial forces generated by the symmetrical impellers at each stage cancel each other out. It can automatically balance the huge axial thrust in the pump cavity without the need for a balancing disc structure, completely solving the problem caused by the wear of the balancing device and greatly improving the reliability and service life of the pump.

[0003] Existing self-balancing multistage pumps have several shortcomings in use. First, their pump body is a one-piece structure, requiring high precision in machining, which can lead to large deviations in machining accuracy and a tendency to leak. Second, the symmetrically arranged impeller rotor components are connected by external pipelines, which not only increases the risk of leakage but also raises the space requirements for the layout of the self-balancing multistage pump. Third, due to the large natural deflection of the slender rotor of the horizontal multistage pump under gravity, wear and even seizure have occurred at the small gaps between the dynamic and static friction pairs, especially under conditions such as thermal shock, frequent start-stop, and abnormal vibration. Fourth, they cannot monitor the pressure and flow data of the inlet and outlet water of the multistage centrifugal pump in real time, and cannot automatically clean the filter in the inlet area when it becomes clogged.

[0004] Therefore, it is necessary to optimize and improve the structure of existing self-balancing multistage pumps. Summary of the Invention

[0005] The purpose of this invention is to overcome at least one of the above-mentioned problems existing in the prior art and to provide a segmented combined self-balancing multistage centrifugal pump.

[0006] To achieve the above-mentioned technical objectives and effects, the present invention is implemented through the following technical solution: A segmented combined self-balancing multistage centrifugal pump includes a front section, a middle section, and a rear section arranged side by side; The front section includes a first sleeve, the inner end of which is provided with a pump cover with a water inlet hole, the outer end of which is open and extends outward to form a first connecting end plate, a first rotating shaft is installed on the first sleeve along the central axis, the outer end of which is provided with a front insertion groove, the inner end of which is provided with an axial flow lifting and stirring head, and multiple sets of first impellers and first guide vanes are installed side by side on the first rotating shaft; The middle section includes a second sleeve, which has two open ends and each extends outward to form a second connecting end plate. A second rotating shaft is installed on the second sleeve along its central axis. The two ends of the second rotating shaft are symmetrically provided with insertion posts. The second rotating shaft is a hollow shaft with an inlet hole and an outlet hole. Multiple sets of second impellers and second guide vanes are installed side by side on the second rotating shaft. A limit frame, an isolation frame, and a drainage bend are installed in the front inner cavity of the second sleeve. The rear section includes a housing, a third connecting end plate is installed at the front end of the housing, a dual-axis motor is installed inside the housing, a snap-fit ​​shaft is installed at the outer end of the front output shaft of the dual-axis motor, a rear snap-fit ​​groove is opened inward at the front end of the snap-fit ​​shaft, and a cooling fan is installed at the outer end of the rear output shaft of the dual-axis motor.

[0007] Furthermore, in the above-mentioned segmented combined self-balancing multistage centrifugal pump, the first connecting end plate of the front section is connected to the second connecting end plate on the front side of the middle section by bolts, and the second connecting end plate on the rear side of the middle section is connected to the third connecting end plate of the rear section by bolts; the front insertion groove of the first rotating shaft engages with the insertion post on the front side of the second rotating shaft, and the rear insertion groove of the locking shaft engages with the insertion post on the rear side of the second rotating shaft, wherein the insertion post adopts a polygonal or spline structure.

[0008] Furthermore, in the above-mentioned segmented combined self-balancing multistage centrifugal pump, the pump cover is provided with several water inlet holes on the periphery of the axial flow lifting agitator head, and a water inlet blockage cleaning mechanism is installed at the inner end of the pump cover.

[0009] Furthermore, in the aforementioned segmented combined self-balancing multistage centrifugal pump, the inlet blockage cleaning mechanism includes an electromagnetic clutch and a cleaning brush. The electromagnetic clutch includes a stationary part and a moving part. The stationary part is embedded in the pump cover, and the moving part is supported by the stationary part for rotation. The stationary part and the moving part have circular holes inside to avoid the axial flow lifting agitator. The axial flow lifting agitator has an iron ring plate installed at the front end of its own agitator blades, which is close to the moving part of the electromagnetic clutch. The cleaning brush plate is installed on the outside of the moving part. When the electromagnetic clutch is energized, the moving part is connected to the iron ring plate. When the electromagnetic clutch is de-energized, the moving part is disconnected from the iron ring plate.

[0010] Furthermore, in the above-mentioned segmented combined self-balancing multistage centrifugal pump, the inlet hole is located at the end of the second rotating shaft near the front section, and the outlet hole is located at the end of the second rotating shaft near the front section. The hollow structure of the second rotating shaft balances the chamber pressure through the inlet hole and the outlet hole.

[0011] Furthermore, in the above-mentioned segmented combined self-balancing multistage centrifugal pump, the first impeller and the second impeller rotate in opposite directions to form a symmetrical flow channel to counteract the axial force.

[0012] Furthermore, in the above-mentioned segmented combined self-balancing multistage centrifugal pump, the limiting frame is sleeved on the outside of the second rotating shaft and cooperates with the outermost first guide vane in the front section. The isolation frame is set in the area between the inlet hole and the innermost second guide vane of the second sleeve. A drain bend is installed through the second sleeve and the isolation frame, and the inner port of the drain bend faces the innermost second guide vane.

[0013] Furthermore, in the above-mentioned segmented combined self-balancing multistage centrifugal pump, the isolation frame is composed of a cylindrical tube in the middle and frustum-shaped tubes at both ends, wherein the frustum-shaped tube near the rear side is provided with a perforation to facilitate the passage of the drainage bend.

[0014] Furthermore, in the above-mentioned segmented combined self-balancing multistage centrifugal pump, a front balance block is installed on the outside of the front output shaft of the dual-shaft motor, and a rear balance block is installed on the outside of the rear output shaft of the dual-shaft motor. The front balance block and the rear balance block are arranged symmetrically to facilitate the cancellation of rotor vibration.

[0015] Furthermore, the aforementioned segmented combined self-balancing multistage centrifugal pump also includes a controller, an inlet pressure transmitter, an inlet flow sensor, an outlet pressure transmitter, and an outlet flow sensor. The inlet pressure transmitter and inlet flow sensor are located inside the pump cover near the inlet hole, while the outlet pressure transmitter and outlet flow sensor are located on the isolation frame near the inner port of the drain bend. The controller is connected to the electromagnetic clutch, the inlet pressure transmitter, the inlet flow sensor, the outlet pressure transmitter, and the outlet flow sensor, respectively. The controller is connected to a back-end terminal via a wireless communication module. The beneficial effects of this invention are: 1. This invention divides the pump body into front, middle, and rear sections, solving the problems of high requirements for machine tool dimensions, large machining accuracy deviations, and easy leakage in traditional one-piece pump bodies. It reduces machining difficulty and improves the overall quality of the pump body. The internal structure of the rotating shaft enables the connection of impeller rotor components at each stage, avoiding external piping, reducing the risk of leakage, and also reducing the space requirements for layout.

[0016] 2. The present invention adopts a reasonable structural design, which reduces the risk of wear or even seizure at the small gap of the dynamic and static friction pairs caused by the natural deflection of the slender rotor of the horizontal multistage pump under gravity. It can effectively protect the rotor, especially under working conditions such as thermal shock, frequent start-stop, and abnormal vibration.

[0017] 3. The present invention is equipped with a water inlet blockage cleaning mechanism. When the filter cover in the water inlet area becomes blocked, it can automatically clean the filter cover in the water inlet area to ensure the normal water intake of the pump.

[0018] 4. This invention is equipped with multiple sensors, which can monitor the pressure and flow data of the inlet and outlet water of the multi-stage centrifugal pump in real time, and transmit the data to the back-end terminal through a wireless communication module, so as to keep track of the pump's operating status in a timely manner.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the above advantages at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of the entire invention; Figure 2 This is a schematic diagram of the front section of the present invention; Figure 3 This is a schematic diagram of the composition of the water inlet blockage cleaning mechanism in this invention; Figure 4 This is a schematic diagram of the middle section of the present invention; Figure 5 This is a schematic diagram of the plug-in post structure in this invention; Figure 6 This is a schematic diagram of the inlet hole in this invention; Figure 7 This is a schematic diagram of the isolation frame in this invention; Figure 8 This is a schematic diagram of the structure of the latter part of the present invention; Figure 9 This is a connection block diagram of the relevant electrical components in this invention; The attached diagram lists the components represented by each number as follows: 1-Front section, 101-First sleeve, 102-Pump cover, 103-First connecting end plate, 104-First rotating shaft, 105-Front insertion groove, 106-Axial flow type lifting agitator head, 107-First impeller, 108-First guide vane, 109-Water inlet hole, 110-Iron ring plate, 111-Electromagnetic clutch, 112-Cleaning brush plate; 2-Middle section, 201-Second sleeve, 202-Second connecting end plate, 203-Second rotating shaft, 204-Plug-in post, 205-Inlet hole, 206-Outlet hole, 207-Second impeller, 208-Second guide vane, 209-Limiting frame, 210-Isolation frame, 211-Drainage bend; 3-Rear section, 301-Housing, 302-Third connecting end plate, 303-Dual shaft motor, 304-Front balance block, 305-Rear balance block, 306-Snap-fit ​​shaft, 307-Rear snap-fit ​​groove, 308-Cooling fan; 4-Controller, 5-Inlet pressure transmitter, 6-Inlet flow sensor, 7-Outlet pressure transmitter, 8-Outlet flow sensor, 9-Wireless communication module. Detailed Implementation

[0022] 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.

[0023] like Figure 1 As shown, this embodiment provides a segmented combined self-balancing multistage centrifugal pump, including a front section 1, a middle section 2, and a rear section 3 arranged side by side.

[0024] like Figure 2 As shown, the front section 1 includes a first sleeve 101. The inner end of the first sleeve 101 is provided with a pump cover 102 with a water inlet hole 109. The outer end of the first sleeve 101 is open and extends outward to form a first connecting end plate 103. A first rotating shaft 104 is installed on the first sleeve 101 along the central axis. The outer end of the first rotating shaft 104 is provided with a front insertion groove 105. An axial flow lifting stirring head 106 is installed on the inner end of the first rotating shaft 104. Multiple sets of first impellers 107 and first guide vanes 108 are installed side by side on the first rotating shaft 104.

[0025] like Figure 4 As shown, the middle section 2 includes a second sleeve 201. The two ends of the second sleeve 201 are open and each extends outward to form a second connecting end plate 202. A second rotating shaft 203 is installed on the second sleeve 201 along the central axis. The two ends of the second rotating shaft 203 are symmetrically provided with insertion posts 204. The second rotating shaft 203 is a hollow shaft with an inlet hole 205 and an outlet hole 206. Multiple sets of second impellers 207 and second guide vanes 208 are installed side by side on the second rotating shaft 203. A limit frame 209, an isolation frame 210 and a drainage bend 211 are installed in the front inner cavity of the second sleeve 201.

[0026] like Figure 8As shown, the rear section 3 includes a housing 301. A third connecting end plate 302 is installed at the front end of the housing 301. A dual-axis motor 303 is installed inside the housing 301. A snap-fit ​​shaft 306 is installed at the outer end of the front output shaft of the dual-axis motor 303. A rear snap-fit ​​groove 307 is opened inward at the front end of the snap-fit ​​shaft 306. A cooling fan 308 is installed at the outer end of the rear output shaft of the dual-axis motor 303.

[0027] In this embodiment, the first connecting end plate 103 of the front section 1 is connected to the second connecting end plate 202 on the front side of the middle section 2 by bolts, and the second connecting end plate 202 on the rear side of the middle section 2 is connected to the third connecting end plate 302 of the rear section 3 by bolts; the front insertion groove 105 of the first rotating shaft 104 engages with the insertion post 204 on the front side of the second rotating shaft 203, and the rear insertion groove 307 of the locking shaft 306 engages with the insertion post 204 on the rear side of the second rotating shaft 203. The insertion post 204 adopts a polygonal or spline structure. This method achieves stable connection and power transmission between the various parts.

[0028] In this embodiment, the pump cover 102 is provided with several water inlet holes 109 on the periphery of the axial flow lifting agitator head 106, and a water inlet blockage cleaning mechanism is installed at the inner end of the pump cover 102.

[0029] like Figure 3 As shown, the water inlet blockage cleaning mechanism includes an electromagnetic clutch 111 and a cleaning brush 112. The electromagnetic clutch 111 includes a fixed part and a moving part. The fixed part is embedded in the pump cover 102, and the moving part is supported by the fixed part for rotation. The fixed part and the moving part have circular holes to avoid the axial flow lifting agitator 106. The axial flow lifting agitator 106 has an iron ring plate 110 installed at the front end of its own agitator blades, which is close to the moving part of the electromagnetic clutch 111. The cleaning brush 112 is installed on the outside of the moving part and can clean the water inlet hole 109 to prevent blockage when rotating. When the electromagnetic clutch 111 is energized, the moving part is connected to the iron ring plate 110. When the electromagnetic clutch 111 is de-energized, the moving part is disconnected from the iron ring plate 110.

[0030] like Figures 5-6 As shown, the inlet hole 205 is located at the end of the second rotating shaft 203 near the front section 1, and the outlet hole 206 is located at the end of the second rotating shaft 203 near the front section 1. The hollow structure of the second rotating shaft 203 balances the cavity pressure through the inlet hole 205 and the outlet hole 206.

[0031] In this embodiment, the first impeller 107 and the second impeller 207 rotate in opposite directions to form a symmetrical flow channel to counteract the axial force, thus achieving automatic balancing of the huge axial thrust in the pump chamber without the need for a balance disc structure.

[0032] In this embodiment, the limiting frame 209 is sleeved on the outside of the second rotating shaft 203 and cooperates with the outermost first guide vane 108 in the front section 1. The isolation frame 210 is located in the area between the inlet hole 205 and the innermost second guide vane 208 of the second sleeve 201. A drain bend 211 is installed through the second sleeve 201 and the isolation frame 210. The inner port of the drain bend 211 faces the innermost second guide vane 208.

[0033] like Figure 7 As shown, the isolation frame 210 is composed of a cylindrical tube 210a located in the middle and frustum-shaped tubes 210b located at both ends, wherein the frustum-shaped tube 210b near the rear side is provided with a through hole 210c to facilitate the passage of the drainage bend 211.

[0034] like Figure 4 As shown, a front balance block 304 is installed on the outside of the front output shaft of the dual-axis motor 303, and a rear balance block 305 is installed on the outside of the rear output shaft of the dual-axis motor 303. The front balance block 304 and the rear balance block 305 are arranged symmetrically to facilitate the cancellation of rotor vibration.

[0035] like Figure 9 As shown, it also includes a controller 4, an inlet pressure transmitter 5, an inlet flow sensor 6, an outlet pressure transmitter 7, and an outlet flow sensor 8. The inlet pressure transmitter 5 and the inlet flow sensor 6 are located inside the pump cover 102 near the water inlet hole 109. The outlet pressure transmitter 7 and the outlet flow sensor 8 are located on the isolation frame 210 near the inner port of the drain bend 211. The controller 4 is connected to the electromagnetic clutch 111, the inlet pressure transmitter 5, the inlet flow sensor 6, the outlet pressure transmitter 7, and the outlet flow sensor 8, respectively. The controller 4 is connected to the back-end terminal through the wireless communication module 9.

[0036] The specific application of this embodiment is as follows: When the filter cover in the water inlet area becomes clogged, the inlet pressure transmitter and inlet flow sensor detect abnormal data and transmit it to the controller. The controller then energizes the electromagnetic clutch, connecting the moving part to the iron ring plate, which in turn drives the cleaning brush plate installed on the outside of the moving part to rotate and clean the water inlet hole to prevent clogging. After cleaning is completed, the controller de-energizes the electromagnetic clutch, disconnecting the moving part from the iron ring plate, and the cleaning brush plate stops rotating.

[0037] A dual-shaft motor drives the front and second shafts to rotate, which in turn rotates the first and second impellers, enabling the intake and discharge of fluid. The fluid enters through the inlet in the front section, is pressurized step by step by the first impeller and first guide vane, the second impeller and second guide vane, and finally exits from the drain bend.

[0038] The inlet pressure transmitter and inlet flow sensor monitor the inlet water pressure and flow data in real time, while the outlet pressure transmitter and outlet flow sensor monitor the outlet water pressure and flow data in real time and transmit the data to the controller. The controller then transmits the data to the back-end terminal via a wireless communication module, allowing users to remotely monitor the pump's operating status.

[0039] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A segmented, combined, self-balancing multistage centrifugal pump, characterized in that, It includes a front section, a middle section, and a rear section arranged side by side; The front section includes a first sleeve, the inner end of which is provided with a pump cover with a water inlet hole, the outer end of which is open and extends outward to form a first connecting end plate, a first rotating shaft is installed on the first sleeve along the central axis, the outer end of which is provided with a front insertion groove, the inner end of which is provided with an axial flow lifting and stirring head, and multiple sets of first impellers and first guide vanes are installed side by side on the first rotating shaft; The middle section includes a second sleeve, which has two open ends and each extends outward to form a second connecting end plate. A second rotating shaft is installed on the second sleeve along its central axis. The two ends of the second rotating shaft are symmetrically provided with insertion posts. The second rotating shaft is a hollow shaft with an inlet hole and an outlet hole. Multiple sets of second impellers and second guide vanes are installed side by side on the second rotating shaft. A limit frame, an isolation frame, and a drainage bend are installed in the front inner cavity of the second sleeve. The rear section includes a housing, a third connecting end plate is installed at the front end of the housing, a dual-axis motor is installed inside the housing, a snap-fit ​​shaft is installed at the outer end of the front output shaft of the dual-axis motor, a rear snap-fit ​​groove is opened inward at the front end of the snap-fit ​​shaft, and a cooling fan is installed at the outer end of the rear output shaft of the dual-axis motor. The first connecting end plate of the front section is connected to the second connecting end plate on the front side of the middle section by bolts, and the second connecting end plate on the rear side of the middle section is connected to the third connecting end plate of the rear section by bolts; the front insertion groove of the first rotating shaft engages with the insertion post on the front side of the second rotating shaft, and the rear insertion groove of the locking shaft engages with the insertion post on the rear side of the second rotating shaft, wherein the insertion post adopts a polygonal or spline structure; The pump cover is provided with several water inlet holes on the periphery of the axial flow lifting agitator head, and a water inlet blockage cleaning mechanism is installed on the inner end of the pump cover. The inlet hole is located at the end of the second rotating shaft near the front section, and the outlet hole is located at the end of the second rotating shaft near the rear section. The hollow structure of the second rotating shaft balances the cavity pressure through the inlet hole and the outlet hole. The internal structure of the shaft enables the connection of impeller rotor components at each stage, avoiding the need for external pipelines.

2. The segmented combined self-balancing multistage centrifugal pump according to claim 1, characterized in that, The water inlet blockage cleaning mechanism includes an electromagnetic clutch and a cleaning brush. The electromagnetic clutch includes a fixed part and a moving part. The fixed part is embedded in the pump cover, and the moving part is rotated and supported by the fixed part. The fixed part and the moving part have circular holes inside to avoid the axial flow lifting agitator. The axial flow lifting agitator has an iron ring plate installed at the front end of its own agitator blades, close to the moving part of the electromagnetic clutch. The cleaning brush plate is installed on the outside of the moving part. When the electromagnetic clutch is energized, the moving part is connected to the iron ring plate. When the electromagnetic clutch is de-energized, the moving part is disconnected from the iron ring plate.

3. The segmented combined self-balancing multistage centrifugal pump according to claim 2, characterized in that, The first impeller and the second impeller rotate in opposite directions to form a symmetrical flow channel to counteract the axial force.

4. The segmented combined self-balancing multistage centrifugal pump according to claim 3, characterized in that, The limiting frame is sleeved on the outside of the second rotating shaft and cooperates with the outermost first guide vane in the front section. The isolation frame is set in the area between the inlet hole and the innermost second guide vane of the second sleeve. A drain bend is installed through the second sleeve and the isolation frame. The inner port of the drain bend faces the innermost second guide vane.

5. The segmented combined self-balancing multistage centrifugal pump according to claim 4, characterized in that, The isolation frame consists of a cylindrical tube in the middle and frustum-shaped tubes at both ends, wherein the frustum-shaped tube near the rear has a perforation to facilitate the passage of a drainage bend.

6. The segmented combined self-balancing multistage centrifugal pump according to claim 5, characterized in that, A front balance block is installed on the outside of the front output shaft of the dual-axis motor, and a rear balance block is installed on the outside of the rear output shaft of the dual-axis motor. The front and rear balance blocks are arranged symmetrically to counteract rotor vibration.

7. The segmented combined self-balancing multistage centrifugal pump according to claim 6, characterized in that, It also includes a controller, an inlet pressure transmitter, an inlet flow sensor, an outlet pressure transmitter, and an outlet flow sensor. The inlet pressure transmitter and the inlet flow sensor are located inside the pump cover near the inlet hole, and the outlet pressure transmitter and the outlet flow sensor are located on the isolation frame near the inner port of the drain bend. The controller is connected to the electromagnetic clutch, the inlet pressure transmitter, the inlet flow sensor, the outlet pressure transmitter, and the outlet flow sensor, respectively. The controller is connected to the back-end terminal through a wireless communication module.

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