Combined main shaft structure for high-lift multi-stage centrifugal pump
By designing a combined spindle structure, including connecting spindle, lengthened spindle, connecting bolts, flange and balanced disk components, the problem that the traditional high-head multi-stage centrifugal pump spindle structure cannot meet the high-head requirements, achieving the effect of improving torsional resistance and simplifying maintenance.
Patent Information
- Application Number
- CN202421830718.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-07-31
AI Technical Summary
The spindle structure of the traditional high-head multi-stage centrifugal pump cannot meet the high-head requirements, and the balance plate and balance ring are vulnerable and difficult to maintain. The spindle diameter of the traditional pump body is small and the number of sections is small.
A combined spindle structure is designed, including connecting spindles, extended spindles, connecting bolts, flanges and balance disc components. Through the fixed connection of the clamping structure and connecting bolts, the torsion resistance and reliability are improved, and maintenance is simplified by disassemblying the convenient balance disc components.
It improves the torsion resistance of the combined spindle, prevents radial and axial slips, simplifies the disassembly and assembly process of the balance disc assembly, facilitates maintenance and replacement, and meets the needs of high-head multi-stage centrifugal pumps.
Smart Images
Figure CN222894405U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of centrifugal pumps, in particular to a combined main shaft structure for a high-lift multi-stage centrifugal pump. Background Art
[0002] The vertical multistage centrifugal pump is a centrifugal pump with compact overall structure, small size, light weight, low noise, significant energy-saving effect and convenient maintenance. It adopts standard vertical motor and quick-install mechanical seal, which is very convenient to replace. The flow-through parts of the pump are made of stainless steel and can be used for mildly corrosive media. When the motor drives the impeller on the shaft to rotate at high speed, the liquid filled in the impeller is thrown from the center of the impeller along the flow channel between the blades to the surrounding of the impeller under the action of centrifugal force. Due to the action of the blades, the pressure and speed of the liquid increase at the same time, and it is led to the next impeller through the flow channel of the guide casing. This is the principle. It flows through all impellers and guide casings one by one, further increasing the pressure energy of the liquid.
[0003] The axial force of a high-lift multistage centrifugal pump is balanced by a balancing disc and a balancing ring in the pump body. During the long-term operation of a centrifugal pump, wear between the balancing disc and the balancing ring is a very common phenomenon. In severe cases, it will cause the performance parameters of the pump to shift or fail to operate. Since the design of the balancing disc and the balancing ring is calculated based on theory, they cannot be adjusted according to factors such as the manufacturing quality of the pump, the viscosity of the liquid, the change in axial force, and the increase in the gap due to wear, the balancing disc and the balancing ring become vulnerable parts, and the maintenance is difficult and time-consuming. In addition, the main shaft diameter of the traditional pump body is small, and the number of sections is also small, which does not meet the needs of high-lift multistage centrifugal pumps. Therefore, it is necessary to optimize and improve the main shaft structure of the traditional pump body. Utility Model Content
[0004] The purpose of the utility model is to overcome the above problems existing in the traditional technology and provide a combined main shaft structure for a high-lift multi-stage centrifugal pump.
[0005] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:
[0006] A combined main shaft structure for a high-lift multi-stage centrifugal pump, comprising a connecting main shaft, an extended main shaft, connecting bolts, a flange and a balancing plate assembly, wherein a boss is provided at one end of the extended main shaft, a plurality of blocks are evenly provided on the outer periphery of the boss, the boss and a pair of the blocks are jointly provided with an inner through hole, a clamping groove cooperating with the boss and the block is provided inwardly at the other end of the extended main shaft, outer through holes are symmetrically provided on the inner wall of the clamping groove, a flange is installed at one end of the connecting main shaft, a clamping groove and an outer through hole are also provided at the other end of the connecting main shaft, the extended main shafts are fixedly connected to each other and between the extended main shaft and the connecting main shaft by means of clamping and then installing connecting bolts, and a detachable balancing plate assembly is sleeved on the outer side of the connecting main shaft.
[0007] Furthermore, in the combined main shaft structure for the high-lift multi-stage centrifugal pump, the outer diameters of the connecting main shaft and the extended main shaft are equal, and the outer diameter value is 120 to 220 mm.
[0008] Furthermore, in the above-mentioned combined main shaft structure for a high-lift multi-stage centrifugal pump, the axial length of the protruding column is 20 to 40 mm.
[0009] Furthermore, in the combined main shaft structure for the high-lift multi-stage centrifugal pump, the outer surface of the extended main shaft is also processed with a keyway for installing the impeller, and the position of the keyway and the position of the clamping groove are staggered.
[0010] Furthermore, in the above-mentioned combined main shaft structure for a high-lift multi-stage centrifugal pump, the balancing disc assembly includes two split discs connected by fastening bolts, and the split disc is composed of a semicircular balancing disc, a semicircular tube sleeve, an end plate and a positioning block. Semicircular tube sleeves are symmetrically provided on both sides of the center hole of the semicircular balancing disc, and end plates with bolt fixing holes are provided at both ends of the semicircular tube sleeve. A positioning block is provided on one side of the mating end face of the semicircular balancing disc, and a positioning groove cooperating with the positioning block is provided on the other side of the mating end face of the semicircular balancing disc.
[0011] Furthermore, in the combined main shaft structure for the high-lift multi-stage centrifugal pump, the semicircular balancing disc, semicircular pipe sleeve, end plate and positioning block are an integrated structure, and the inner diameter of the semicircular pipe sleeve matches the outer diameter of the connecting main shaft.
[0012] The beneficial effects of the utility model are:
[0013] The utility model has a reasonable structural design, which is mainly composed of a connecting spindle, an extended spindle, connecting bolts, a flange and a balancing plate assembly. The number of extended spindles can be increased or decreased according to demand. The spindles are fixedly connected by adding connecting bolts after clamping. The clamping structure formed by the boss, the clamping block and the clamping groove can improve the overall torsion resistance of the combined spindle and prevent radial slippage; the mounting holes formed by the inner and outer perforations can completely hide the connecting bolts, further ensure the reliability of the connection, and prevent axial slippage; in addition, the balancing plate assembly is easy to disassemble and assemble. There is no need to disconnect the connecting spindle and the motor shaft during disassembly and assembly, which is convenient for subsequent maintenance and replacement.
[0014] Of course, any product implementing the present invention does not necessarily need to achieve all of the above advantages at the same time. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0017] Figure 2 This is a schematic diagram of the structure of the utility model after omitting the balancing disc assembly;
[0018] Figure 3 It is a schematic diagram of the structure of the lengthened main shaft in the utility model;
[0019] Figure 4 It is a half-section structural schematic diagram of the lengthened main shaft in the utility model;
[0020] Figure 5 It is a schematic diagram of the structural decomposition of the balancing disc assembly in the utility model;
[0021] Figure 6 It is a structural schematic diagram of the balancing disc assembly in the utility model;
[0022] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0023] 1-connecting spindle, 2-extending spindle, 201-boss, 202-block, 203-inner perforation, 204-clamping groove, 205-outer perforation, 3-connecting bolt, 4-flange, 5-balancing disc assembly, 501-semicircular balancing disc, 502-semicircular pipe sleeve, 503-end plate, 504-fastening bolt, 505-positioning block, 506-positioning groove. DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0025] See also Figure 1-Figure 6 As shown, this embodiment provides a combined main shaft structure for a high-lift multi-stage centrifugal pump, including a connecting main shaft 1, an extended main shaft 2, a connecting bolt 3, a flange 4 and a balancing plate assembly 5. A boss 201 is provided at one end of the extended main shaft 2, and a plurality of blocks 202 are evenly arranged on the outer periphery of the boss 201. The boss 201 and one pair of blocks 202 are jointly provided with an inner through hole 203. A clamping groove 204 cooperating with the boss 201 and the block 202 is provided inwardly at the other end of the extended main shaft 2, and an outer through hole 205 is symmetrically provided on the inner wall of the clamping groove 204. A flange 4 is installed at one end of the connecting main shaft 1, and a clamping groove and an outer through hole are also provided at the other end of the connecting main shaft 1. The extended main shafts 2 are fixedly connected to each other and between the extended main shaft 2 and the connecting main shaft 1 by means of clamping and then installing a connecting bolt 3, and a detachable balancing plate assembly 5 is sleeved and installed on the outer side of the connecting main shaft 1.
[0026] In this embodiment, the outer diameters of the connecting spindle 1 and the extended spindle 2 are equal, and the outer diameter value is 120-220 mm. The axial length of the protrusion 201 is 20-40 mm.
[0027] In this embodiment, the outer surface of the extended main shaft 2 is also processed with a keyway (not shown in the figure) for facilitating the installation of the impeller, and the position of the keyway and the position of the clamping groove 204 are staggered.
[0028] In this embodiment, the balancing disc assembly 5 includes two split discs connected by fastening bolts 504, and the split discs are composed of a semicircular balancing disc 501, a semicircular tube sleeve 502, an end plate 503 and a positioning block 505. Semicircular tube sleeves 502 are symmetrically provided on both sides of the center hole of the semicircular balancing disc 501, and end plates 503 with bolt fixing holes are provided at both ends of the semicircular tube sleeve 502. A positioning block 505 is provided on one side of the semicircular balancing disc 501 located at the docking end surface, and a positioning groove 506 cooperating with the positioning block 505 is provided on the other side of the semicircular balancing disc 501 located at the docking end surface.
[0029] In this embodiment, the semicircular balancing disc 501 , the semicircular tube sleeve 502 , the end plate 503 and the positioning block 505 are an integrated structure, and the inner diameter of the semicircular tube sleeve 502 matches the outer diameter of the connecting spindle 1 .
[0030] A specific application of this embodiment is: the combined spindle structure is mainly composed of a connecting spindle 1, an extended spindle 2, a connecting bolt 3, a flange 4 and a balancing disk assembly 5. The number of extended spindles 2 can be increased or decreased according to demand. The spindles are fixedly connected by adding connecting bolts after clamping. The clamping structure formed by the boss 201, the clamping block 202 and the clamping groove 204 can improve the overall torsion resistance of the combined spindle and prevent radial slippage; the mounting hole formed by the inner through hole 203 and the outer through hole 205 can completely hide the connecting bolt 3, further ensure the reliability of the connection, and prevent axial slippage; in addition, the balancing disk assembly 5 is easy to disassemble and assemble. There is no need to disconnect the connecting spindle 1 from the motor shaft during disassembly and assembly, which is convenient for subsequent maintenance and replacement.
[0031] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is only limited by the claims and their full scope and equivalents.
Claims
1. A combined main shaft structure for a high-lift multi-stage centrifugal pump, characterized in that: It includes a connecting spindle, an extended spindle, connecting bolts, a flange and a balancing plate assembly, wherein a boss is provided at one end of the extended spindle, a plurality of blocks are evenly provided on the outer circumference of the boss, the boss and a pair of the blocks are jointly provided with an inner through hole, a clamping groove cooperating with the boss and the block is provided inwardly at the other end of the extended spindle, and outer through holes are symmetrically provided on the inner wall of the clamping groove, a flange is installed at one end of the connecting spindle, and a clamping groove and an outer through hole are also provided at the other end of the connecting spindle, the extended spindles are fixedly connected to each other and between the extended spindle and the connecting spindle by means of clamping and then installing connecting bolts, and a detachable balancing plate assembly is installed on the outer sleeve of the connecting spindle.
2. The combined main shaft structure for a high-lift multistage centrifugal pump according to claim 1, characterized in that: The outer diameters of the connecting main shaft and the extended main shaft are equal, and the outer diameter value is 120-220 mm.
3. The combined main shaft structure for a high-lift multistage centrifugal pump according to claim 2, characterized in that: The axial length of the protruding column is 20-40 mm.
4. The combined main shaft structure for a high-lift multistage centrifugal pump according to claim 3, characterized in that: The outer surface of the extended main shaft is also processed with a keyway for facilitating the installation of the impeller, and the position of the keyway and the position of the clamping groove are staggered with each other.
5. The combined main shaft structure for a high-lift multistage centrifugal pump according to claim 4, characterized in that: The balancing disc assembly includes two split discs connected by fastening bolts, and the split discs are composed of a semicircular balancing disc, a semicircular tube sleeve, an end plate and a positioning block. Semicircular tube sleeves are symmetrically provided on both sides of the center hole of the semicircular balancing disc, and end plates with bolt fixing holes are provided at both ends of the semicircular tube sleeve. A positioning block is provided on one side of the semicircular balancing disc located at the butt end surface, and a positioning groove cooperating with the positioning block is provided on the other side of the semicircular balancing disc located at the butt end surface.
6. The combined main shaft structure for a high-lift multistage centrifugal pump according to claim 5, characterized in that: The semicircular balancing disc, the semicircular tube sleeve, the end plate and the positioning block are an integrated structure, and the inner diameter of the semicircular tube sleeve matches the outer diameter of the connecting main shaft.