A multi-stage centrifugal pump convenient for maintenance

Abstract

The application relates to the technical field of centrifugal pumps, and discloses a multistage centrifugal pump convenient to overhaul, which comprises a pressure-resistant cylinder, a pump core arranged in the pressure-resistant cylinder and a driving motor arranged on the pressure-resistant cylinder, the pump core comprises a rotating shaft, a plurality of guide vanes arranged outside the rotating shaft and an impeller arranged in each guide vane, a connecting piece is arranged on each guide vane, the connecting piece is arranged outside the guide vane, one connecting piece is arranged on each side of the guide vane, and the connecting pieces are used for connecting the guide vanes together. The connecting piece is fixed on each guide vane through a quick-connection mechanism, the assembling efficiency of the guide vanes is improved, the guide vanes are convenient to overhaul, and human resources are saved.

Description

Technical Field

[0001] This application relates to the technical field of centrifugal pumps, and in particular to a multistage centrifugal pump that is easy to maintain. Background Technology

[0002] Multistage centrifugal pumps, as an important type of fluid transport equipment, operate on the principle of cascading multiple impellers in series. Liquid passes through each impeller stage sequentially, accumulating energy at each stage. In this process, each impeller acts as an independent "pressurization station," significantly increasing the pressure of the liquid with each stage. This results in multistage centrifugal pumps achieving outlet heads far exceeding those of single-stage centrifugal pumps. Due to this outstanding high-head characteristic, multistage centrifugal pumps play an irreplaceable role in numerous high-pressure fluid transport scenarios, becoming key equipment in modern industrial production, high-rise building water supply, municipal pipeline pressurization, mine drainage, and large-scale agricultural irrigation, providing a solid foundation for the stable operation and development of these industries. Their technological development and performance optimization directly affect the working efficiency, energy consumption level, and operational reliability of related systems.

[0003] In related technologies, multistage centrifugal pumps typically consist of a pressure-resistant cylinder, a pump core housed within the pressure-resistant cylinder, and a drive motor mounted on the pressure-resistant cylinder. The pump core includes a shaft, several guide vanes mounted on the outside of the shaft, and an impeller nested within each guide vane. The guide vane, as a key stationary component, performs two crucial functions: first, it effectively converts the enormous kinetic energy carried by the high-speed liquid flowing from the impeller outlet into static pressure energy through its carefully designed flow channel—a critical step in achieving pressure increase; second, it guides the decelerated and pressurized liquid, ensuring it flows smoothly into the inlet of the next impeller stage or the final discharge chamber at an optimal flow angle and state, thereby guaranteeing efficient energy transfer and stable fluid flow. To ensure the stability of this precision system under long-term high-pressure operating conditions, traditional designs typically use several through-bolts to connect and secure all these series-connected guide vanes into a single unit, thus resisting internal pressure and maintaining precise alignment between components.

[0004] However, when the guide vanes need to be inspected, repaired, or replaced, maintenance personnel must first loosen and remove all of these long through bolts one by one. Due to the large number and length of these bolts, and the extremely high tightening torque applied during initial installation to ensure sealing and structural rigidity, the disassembly process is exceptionally time-consuming and labor-intensive. This not only significantly increases equipment downtime for maintenance, affecting the continuous operation of related production or water supply systems, but also places higher physical demands on maintenance personnel, increasing labor costs and operational safety risks. Therefore, this traditional connection method has become a significant bottleneck restricting the improvement of maintenance efficiency for multistage centrifugal pumps, urgently requiring a more convenient and reliable guide vane fixing and separation solution. Utility Model Content

[0005] To improve the ease of maintenance of multistage centrifugal pumps, this application provides a multistage centrifugal pump that is easy to maintain.

[0006] This application provides a multi-stage centrifugal pump that is easy to maintain, employing the following technical solution: A multistage centrifugal pump that is easy to maintain includes a pressure-resistant cylinder, a pump core disposed in the pressure-resistant cylinder, and a drive motor disposed on the pressure-resistant cylinder. The pump core includes a rotating shaft, a plurality of guide vanes sleeved on the outside of the rotating shaft, and an impeller disposed in each guide vane. Each guide vane is provided with a connecting piece, which is disposed on the outside of the guide vane. There is one connecting piece on each side of the guide vane, and the connecting piece is used to connect the guide vanes together.

[0007] By adopting the above technical solution, when the guide vanes need to be inspected, it is only necessary to first remove the pressure-resistant cylinder, and then disassemble the connecting plates on the outside of the guide vanes to disassemble each guide vane. Compared with fixing the guide vanes with through bolts, there is no need for the complicated process of pulling the entire through bolt out of the guide vane, saving the physical strength of maintenance personnel, facilitating the maintenance or replacement of guide vanes, simplifying the disassembly process, significantly reducing the labor intensity and time required for maintenance work, and improving the convenience of overhauling multi-stage centrifugal pumps. Connecting plates are provided on both sides of the guide vanes, allowing the fastening force to be evenly distributed, avoiding the problems of uneven force on the guide vane assembly, skewness, or bending stress that may occur with unilateral connections, and improving the connection stability between the guide vanes.

[0008] Optionally, the connecting piece is arranged along the arrangement direction of each guide vane, and positioning pieces are provided at both ends of the connecting piece. Positioning holes for the positioning pieces to extend into are provided on the sidewalls of the guide vanes at both ends of the rotating shaft. A quick-connect structure is provided between the positioning piece and the sidewall of the guide vane, and the positioning piece is connected to the guide vane through the quick-connect structure.

[0009] By adopting the above technical solution, when it is necessary to fix each guide vane, simply arrange the guide vanes together in sequence, then insert the positioning plates into the positioning holes, and connect the positioning plates to the guide vanes using the quick-connect structure. This achieves rapid positioning and connection between the guide vanes and the connecting plates. Furthermore, the introduction of the quick-connect structure makes the connection and separation of the connecting plates and guide vanes very convenient, eliminating the need for complex tightening or loosening operations using special tools. This enables rapid assembly and disassembly of the guide vane assembly, facilitating the maintenance of the guide vanes.

[0010] Optionally, the positioning piece and the connecting piece are integrally formed.

[0011] By adopting the above technical solution, the assembly error between the positioning plate and the connecting plate is reduced, lowering the possibility of loosening during use. No additional connectors are needed to link the positioning plate and the connecting plate, enhancing the overall structural strength and rigidity of the two components, making them more reliable when subjected to vibrations and pressure fluctuations during centrifugal pump operation. Simultaneously, the integrated structure reduces the number of parts, simplifies production and assembly processes, and helps reduce manufacturing costs and improve production consistency.

[0012] Optionally, the quick-connect structure includes a limiting piece disposed on the positioning piece and an elastic element disposed between the positioning piece and the limiting piece. The elastic element can drive the limiting piece to move away from the positioning piece. After the positioning piece extends into the positioning hole, the limiting piece abuts against the inner wall of the guide vane.

[0013] By adopting the above technical solution, when the positioning plate needs to be connected to the guide vane, simply insert the positioning plate and the limiting plate into the positioning hole. During insertion, the wall of the positioning hole will push the limiting plate towards the side closer to the positioning plate, causing the elastic element to be compressed and store energy. Then, when the limiting plate is fully inserted into the guide vane, the wall of the positioning hole no longer limits the limiting plate, and the elastic element will release its elastic potential energy, thereby pushing the limiting plate away from the positioning plate. This causes the limiting plate to abut against the inner wall of the guide vane, thus preventing the positioning plate from moving out of the positioning hole, completing the fixation of the positioning plate and achieving rapid fixation of the guide vane. Utilizing the continuous elastic force provided by the elastic element, a reliable axial lock is formed, effectively preventing the positioning plate from accidentally loosening due to vibration during operation. When it is necessary to remove the positioning plate, simply overcome the elastic force of the elastic element to retract the limiting plate, easily releasing the lock on the positioning plate, greatly improving the convenience of maintenance.

[0014] Optionally, the limiting piece includes a connecting part connected to the elastic element and a limiting part abutting against the inner wall of the guide vane. The limiting part is arranged along the arrangement direction of the guide vane, and the connecting part is inclinedly arranged at the end of the positioning piece away from the connecting piece. The distance between the connecting part and the positioning piece gradually increases from the positioning piece to the connecting piece.

[0015] By adopting the above technical solution, the limiting part increases the contact area between the limiting piece and the inner wall of the guide vane, providing a sufficiently large contact bearing area to ensure that the locking force can be evenly distributed. This results in a better limiting effect of the limiting piece on the positioning piece, thereby increasing the connection stability of each guide vane. The inclined setting of the connecting part creates a guide tip between the limiting piece and the positioning piece. This allows the limiting piece to automatically compress the elastic element and guide the positioning piece to slide smoothly into the positioning hole during insertion, greatly reducing insertion resistance and achieving a smooth blind insertion effect. This simplifies the assembly operation and facilitates the insertion of the limiting piece and positioning piece into the positioning hole, thus facilitating the installation of the connecting piece.

[0016] Optionally, the limiting part is provided with an unlocking piece. After the positioning piece extends into the positioning hole, the unlocking piece extends out of the guide vane along the positioning hole. The distance between the unlocking piece and the positioning piece is greater than the length of the limiting part along the direction of the guide vane arrangement.

[0017] By adopting the above technical solution, the design of the unlocking plate provides operators with a direct and convenient point of force to manipulate the internal limiting plate from the outside of the guide vane. During disassembly, there is no need to use special tools to reach into narrow spaces to move the limiting plate; simply pressing or moving the exposed unlocking plate overcomes the spring force, causing the limiting part to retract and thus releasing the lock. This makes the disassembly process more direct, safe, and user-friendly, further consolidating the significant advantages of quick-connect structures in maintenance scenarios.

[0018] Optionally, a rubber plug is provided in the positioning hole. When the positioning piece is inserted into the positioning hole, the rubber plug is located between the unlocking piece and the positioning piece, and the rubber plug is interference-fitted with the hole wall, the unlocking piece, and the positioning piece.

[0019] By adopting the above technical solution, firstly, the rubber plug forms an interference fit with the positioning hole wall, the unlocking plate, and the positioning plate, effectively sealing the positioning hole and preventing high-pressure liquid inside the pump from leaking through this channel, thus ensuring the pump's sealing integrity. Secondly, the friction generated by the interference fit of the rubber plug provides additional vibration damping for the quick-connect structure, effectively suppressing minor loosening that may occur during equipment operation and enhancing the reliability of the connection. Finally, the rubber material can also absorb some vibration energy, playing a role in buffering and noise reduction.

[0020] Optionally, the connecting piece is provided with a plurality of fixing pieces, and each guide vane is provided with a limiting ring on its side wall, and the fixing pieces abut against the limiting rings.

[0021] By adopting the above technical solution, the abutting fit between the fixing plate and the upper limit ring on the guide vane sidewall provides radial positioning and constraint between the connecting plate and the guide vane. This not only plays a role in assisting alignment during assembly, but also effectively prevents minor radial or axial displacement or wobbling between the guide vane and the connecting plate during operation, thereby improving the connection stability and coaxiality of the entire guide vane assembly.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. The guide vanes are fixedly connected together by connecting plates set on the outside of the guide vanes. During maintenance, the connecting plates can be disassembled and reassembled only on the outside of the guide vanes. The operation is simple and convenient for maintenance of the guide vanes. 2. The connecting piece is connected to the side wall of the guide vane through the positioning piece, and the limiting piece is pressed against the inner wall of the guide vane by the elastic element. The elastic element continuously provides elastic force, so that the limiting piece has a good limiting effect on the positioning piece, thereby making the connecting piece have a good fixing effect on the guide vane. 3. When the guide vane needs to be inspected, simply remove the rubber plug from the positioning hole, then push the unlocking piece away from the positioning piece so that the limiting piece no longer abuts against the inner wall of the guide vane. Finally, remove the positioning piece and the limiting piece together from the positioning hole. The operation is convenient. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0024] Figure 2 This is a partial structural diagram of the rotating shaft shown after the pressure-resistant cylinder is hidden in Embodiment 1 of this application.

[0025] Figure 3 This is a partial structural diagram of the positioning plate after the pressure-resistant cylinder and part of the guide vanes are hidden in Embodiment 1 of this application.

[0026] Figure 4 This is a partial structural diagram of the limiting piece used to display the pressure-resistant cylinder after it is hidden in Embodiment 2 of this application.

[0027] Figure 5 This is a partial structural diagram of the elastic element shown in Embodiment 2 of this application after concealing the pressure-resistant cylinder and part of the guide vanes.

[0028] Explanation of reference numerals in the attached figures: 1. Pressure-resistant cylinder; 2. Pump core; 21. Rotary shaft; 22. Guide vane; 221. Positioning hole; 222. Limiting ring; 3. Drive motor; 4. Connecting piece; 41. Positioning piece; 42. Fixing piece; 5. Quick-connect structure; 51. Limiting piece; 511. Connecting part; 512. Limiting part; 513. Unlocking piece; 52. Elastic element; 6. Rubber plug. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0030] This application discloses a multi-stage centrifugal pump that is easy to maintain.

[0031] Example 1 Reference Figure 1 and Figure 2 A multistage centrifugal pump that is easy to maintain includes a pressure-resistant cylinder 1, a pump core 2, and a drive motor 3. The pressure-resistant cylinder 1 provides a relatively closed and pressure-resistant environment to protect the pump core 2 and other components from working normally under high pressure. The pump core 2 is set in the pressure-resistant cylinder 1 and is the core part for realizing liquid transportation and pressurization. The drive motor 3 is set on the pressure-resistant cylinder 1 to provide power for the operation of the pump core 2, thereby achieving the effect of efficient liquid transportation and pressurization.

[0032] Reference Figure 2 The pump core 2 includes a rotating shaft 21, guide vanes 22, and an impeller (not shown in the figure). The rotating shaft 21 is a key component of the pump core 2, and it rotates under the drive of the drive motor 3. The rotating shaft 21 is usually made of high-strength, corrosion-resistant metal materials, such as stainless steel.

[0033] Reference Figure 2 The guide vane 22 is mounted on the outside of the rotating shaft 21. It is a stationary component that undertakes the important functions of converting the kinetic energy of the high-speed liquid flowing out of the impeller outlet into static pressure energy and guiding the liquid into the next stage impeller or the final discharge chamber at a suitable angle and state.

[0034] Reference Figure 2 Each guide vane 22 is provided with a connecting piece 4, which is located on the outside of the guide vane 22, with one connecting piece on each side of the guide vane 22. The connecting piece 4 is used to connect the guide vanes 22 together. The connecting piece 4 can effectively resist the internal pressure of the multi-stage centrifugal pump, maintain the precise alignment between the guide vanes 22, and ensure the normal operation of the pump.

[0035] Reference Figure 2 The connecting piece 4 is usually made of steel plate, which has high strength and rigidity. Its shape is generally long and narrow, and its length is adapted to the arrangement length of the guide vanes 22.

[0036] Reference Figure 2 The connecting piece 4 is arranged along the direction of the guide vanes 22, and positioning pieces 41 are provided at both ends of the connecting piece 4. The positioning pieces 41 are used to accurately position the connecting piece 4 on the guide vanes 22 to ensure the connection accuracy between the connecting piece 4 and the guide vanes 22. The positioning pieces 41 and the connecting piece 4 are integrally formed, which can improve the integrity and strength of the structure.

[0037] Reference Figure 2 and Figure 3The guide vanes 22 at both ends of the rotating shaft 21 have positioning holes 221 on their sidewalls for the positioning piece 41 to extend into. A quick-connect structure 5 is provided between the positioning piece 41 and the sidewall of the guide vane 22, and the positioning piece 41 is connected to the guide vane 22 through the quick-connect structure 5. In this embodiment, the quick-connect structure 5 can connect the positioning piece 41 to the guide vane 22 by snap-fit ​​or bolt connection, so that the positioning piece 41 can be quickly and easily connected and separated from the guide vane 22, which greatly improves the installation and disassembly efficiency of the guide vane 22.

[0038] The implementation principle of a multi-stage centrifugal pump that facilitates maintenance according to an embodiment of this application is as follows: Each guide vane 22 is connected together via a connecting piece 4, avoiding the difficulty of disassembly associated with traditional through-bolt connections. The positioning pieces 41 at both ends of the connecting piece 4 are connected to the guide vanes 22 via quick-connect structures 5, improving the installation efficiency of the connecting piece 4 and the guide vanes 22. This, in turn, improves the maintenance efficiency of the multi-stage centrifugal pump guide vanes 22, reducing maintenance costs and operational safety risks.

[0039] Example 2 Reference Figure 4 and Figure 5 The difference between this embodiment and Embodiment 1 is that the quick-connect structure 5 includes a limiting piece 51 disposed on the positioning piece 41 and an elastic member 52 disposed between the positioning piece 41 and the limiting piece 51. The elastic member 52 can drive the limiting piece 51 to move away from the positioning piece 41. When the positioning piece 41 extends into the positioning hole 221, the limiting piece 51 abuts against the inner wall of the guide vane 22, thereby realizing the connection between the positioning piece 41 and the guide vane 22.

[0040] Reference Figure 5 In this embodiment, the elastic element 52 can be a spring, which has good elasticity and recovery performance, or a material such as a rubber elastomer can be used to replace the spring. The limiting piece 51 includes a connecting part 511 connected to the elastic element 52 and a limiting part 512 abutting against the inner wall of the guide vane 22. The limiting part 512 is arranged along the arrangement direction of the guide vane 22. The connecting part 511 is inclinedly arranged at the end of the positioning piece 41 away from the connecting piece 4, and the distance between the connecting part 511 and the positioning piece 41 gradually increases along the direction from the positioning piece 41 to the connecting piece 4.

[0041] Reference Figure 4 and Figure 5 The limiting part 512 is provided with an unlocking piece 513. After the positioning piece 41 extends into the positioning hole 221, the unlocking piece 513 extends out of the guide vane 22 along the positioning hole 221. The distance between the unlocking piece 513 and the positioning piece 41 is greater than the length of the limiting part 512 along the arrangement direction of the guide vane 22. The setting of the unlocking piece 513 facilitates the unlocking operation of the quick-connect structure 5.

[0042] Reference Figure 4 and Figure 5A rubber plug 6 is provided in the positioning hole 221. After the positioning piece 41 extends into the positioning hole 221, the rubber plug 6 is then inserted between the unlocking piece 513 and the positioning piece 41, so that the rubber plug 6 has an interference fit with the hole wall of the positioning hole 221, the unlocking piece 513, and the positioning piece 41. The rubber plug 6 plays a sealing and buffering role, preventing liquid from leaking from the positioning hole 221, and reducing wear and vibration between the positioning piece 41 and the hole wall of the positioning hole 221. The rubber plug 6 can be made of materials with good sealing performance and oil resistance, such as nitrile rubber.

[0043] Reference Figure 5 The connecting piece 4 is provided with several fixing pieces 42, and each guide vane 22 is provided with a limiting ring 222 on its side wall. The fixing pieces 42 abut against the limiting rings 222. The fixing pieces 42 and the limiting rings 222 on each connecting piece 4 correspond one-to-one. The cooperation between the fixing pieces 42 and the limiting rings 222 further enhances the connection stability between the connecting piece 4 and the guide vane 22 and reduces the displacement of the guide vane 22 during operation.

[0044] The implementation principle of a multi-stage centrifugal pump that facilitates maintenance according to an embodiment of this application is as follows: When it is necessary to assemble the guide vanes 22 together, simply connect the guide vanes 22 in sequence, and then insert the positioning plate 41 and the limiting plate 51 into the positioning hole 221. This allows the elastic element 52 to drive the limiting plate 51 to abut against the inner wall of the guide vane 22, thereby achieving quick fixation of the positioning plate 41. When it is necessary to disassemble the guide vane 22, simply press the unlocking plate 513 to make the limiting plate 51 overcome the elastic force of the elastic element 52 and move towards the positioning plate 41. This allows the positioning plate 41 and the limiting plate 51 to be pulled out from the positioning hole 221, further improving the maintenance efficiency of the multi-stage centrifugal pump guide vanes 22 and reducing maintenance costs and operational safety risks.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A multi-stage centrifugal pump that is easy to maintain, comprising a pressure-resistant cylinder (1), a pump core (2) disposed in the pressure-resistant cylinder (1), and a drive motor (3) disposed on the pressure-resistant cylinder (1), wherein the pump core (2) comprises a rotating shaft (21), a plurality of guide vanes (22) sleeved on the outside of the rotating shaft (21), and an impeller disposed in each guide vane (22), characterized in that: Each of the guide vanes (22) is provided with a connecting piece (4). The connecting piece (4) is located on the outside of the guide vane (22). There is one connecting piece (4) on each side of the guide vane (22). The connecting piece (4) is used to connect the guide vanes (22) together.

2. The multi-stage centrifugal pump that is easy to maintain according to claim 1, characterized in that: The connecting piece (4) is arranged along the arrangement direction of each guide vane (22). The two ends of the connecting piece (4) are provided with positioning pieces (41). The side walls of the guide vanes (22) at both ends of the rotating shaft (21) are provided with positioning holes (221) for the positioning pieces (41) to extend into. A quick-connect structure (5) is provided between the positioning piece (41) and the side wall of the guide vane (22). The positioning piece (41) is connected to the guide vane (22) through the quick-connect structure (5).

3. A multi-stage centrifugal pump that is easy to maintain according to claim 2, characterized in that: The positioning piece (41) and the connecting piece (4) are integrally formed.

4. A multi-stage centrifugal pump that is easy to maintain according to claim 2, characterized in that: The quick-connect structure (5) includes a limiting piece (51) disposed on the positioning piece (41) and an elastic member (52) disposed between the positioning piece (41) and the limiting piece (51). The elastic member (52) can drive the limiting piece (51) to move away from the positioning piece (41). After the positioning piece (41) extends into the positioning hole (221), the limiting piece (51) abuts against the inner wall of the guide vane (22).

5. A multi-stage centrifugal pump that is easy to maintain according to claim 4, characterized in that: The limiting piece (51) includes a connecting part (511) connected to the elastic member (52) and a limiting part (512) abutting against the inner wall of the guide vane (22). The limiting part (512) is arranged along the arrangement direction of the guide vane (22). The connecting part (511) is inclinedly arranged at the end of the positioning piece (41) away from the connecting piece (4), and the distance between the connecting part (511) and the positioning piece (41) gradually increases from the positioning piece (41) to the connecting piece (4).

6. A multi-stage centrifugal pump that is easy to maintain according to claim 5, characterized in that: The limiting part (512) is provided with an unlocking piece (513). After the positioning piece (41) extends into the positioning hole (221), the unlocking piece (513) extends out of the guide vane (22) along the positioning hole (221). The distance between the unlocking piece (513) and the positioning piece (41) is greater than the length of the limiting part (512) along the arrangement direction of the guide vane (22).

7. A multi-stage centrifugal pump that is easy to maintain according to claim 6, characterized in that: A rubber plug (6) is provided in the positioning hole (221). When the positioning piece (41) extends into the positioning hole (221), the rubber plug (6) is located between the unlocking piece (513) and the positioning piece (41), and the rubber plug (6) is interference-fitted with the hole wall of the positioning hole (221), the unlocking piece (513) and the positioning piece (41).

8. A multi-stage centrifugal pump that is easy to maintain according to claim 2, characterized in that: The connecting piece (4) is provided with a plurality of fixing pieces (42), and each guide vane (22) is provided with a limiting ring (222) on its side wall. The fixing piece (42) abuts against the limiting ring (222).

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