High-rotating-speed multi-stage centrifugal pump

Abstract

The utility model relates to a high-rotating-speed multi-stage centrifugal pump which comprises an outer shell, a bearing installed in the outer shell, a sealing ring fixed to the side face of the bearing, a rotating shaft fixed in the bearing and centrifugal blades fixed to the outer side of the rotating shaft. Good adaptability is achieved for fluids with different viscosities, and kinetic energy of the fluids can be converted into pressure energy to the maximum extent under the condition that it is ensured that flow separation and vortexes are reduced; by adjusting the blades of the diffuser, the device not only can pressurize water, but also has a better pressurizing effect on oil substances, and can obtain higher lift.

Description

Technical Field

[0001] This utility model relates to the field of booster pump structure, and in particular to a high-speed multistage centrifugal pump. Background Technology

[0002] Multistage centrifugal pumps, as highly efficient fluid transport devices, are widely used in petrochemical, water conservancy, and power systems. They convert the kinetic energy of fluids into pressure energy through the high-speed rotation of multistage impellers, achieving high-head transport. However, the diffuser blade angles of existing centrifugal pumps are typically fixed, making dynamic adjustment based on changes in fluid viscosity difficult. When handling high-viscosity fluids (such as oils), fixed blades can easily lead to fluid flow separation and eddy currents, reducing energy conversion efficiency and even causing insufficient head. Furthermore, if the fluid flow path within the diffuser does not match the blade angle during the high-speed rotation of the multistage impellers, it will exacerbate flow resistance and increase energy loss. Especially for different media (such as water and oil), fixed blades cannot simultaneously achieve the optimal flow characteristics for both, leading to a decline in overall performance. Existing solutions still have some shortcomings in addressing this issue. For example, patent CN222208392U discloses a double-acting multi-stage booster vane pump. The core technology of this double-acting multi-stage booster vane pump is to set up multiple inlets and multiple vanes in cooperation. By selecting different inlets through a sealing mechanism, liquids of different viscosities can be pumped and transported using the corresponding number of vanes, thereby improving the liquid transport efficiency. However, it still has the following shortcomings: when transporting different liquids, the number of vanes through which the liquid passes varies, resulting in significant changes in head, and it cannot adapt well to liquids of different viscosities. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this invention aims to provide a high-speed, multi-stage centrifugal pump that solves the problems existing in the prior art. By adjusting the diffuser blade angle in real time through an adjustment mechanism, the blade angle is dynamically matched to the fluid viscosity, reducing flow separation and eddies, and improving the pressurization capacity for multiple media. The adjustable diffuser blade angle allows the fluid flow within the diffuser to better conform to the blade profile, reducing flow resistance and maximizing the conversion of kinetic energy into pressure energy, thus improving energy conversion efficiency. The use of a screw motor-driven internal gear transmission mechanism enables electric and precise adjustment of the blade angle, simplifying maintenance procedures and enhancing the intelligence and reliability of the equipment.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-speed multistage centrifugal pump, comprising a housing, a bearing installed inside the housing, a sealing ring fixed to the side of the bearing, a rotating shaft fixed inside the bearing, and centrifugal blades fixed to the outside of the rotating shaft;

[0007] The centrifugal blades include a diffuser fixed inside the housing, diffuser blades installed in the middle of the diffuser, centrifugal fan blades fixed on the rotating shaft, an adjustment mechanism fixed on the side of the diffuser, and a conduit fixed on the side of the adjustment mechanism.

[0008] Preferably, the adjustment mechanism includes a first connecting rod mounted on the diffuser blade, a second connecting rod mounted at the end of the first connecting rod, a fixing block mounted at the end of the second connecting rod, an internal gear ring gear bolted inside the fixing block, a drive gear meshing with the internal gear ring gear, and a screw motor fixed at the lower end of the drive gear.

[0009] Preferably, cylindrical shafts are provided at both ends of the diffuser blades, and square shafts are provided at the connection between the cylindrical shafts and the first connecting rod.

[0010] Preferably, the upper end of the fixing block is provided with a connecting groove, and a locking rod is inserted into the connecting groove.

[0011] Preferably, the lower end of the fixing block is provided with a wing plate, and the wing plate is provided with a through hole.

[0012] Preferably, the back of the internal gear ring is provided with a pair of threaded holes.

[0013] Preferably, the outer shell is divided into an upper shell and a lower shell, with a water inlet on the upper shell and a water outlet on the side of the lower shell.

[0014] (III) Beneficial Effects

[0015] The purpose of this invention is to provide a high-speed multi-stage centrifugal pump. Through the coordinated design of adjustable diffuser blades and electric drive mechanism, the multi-stage centrifugal pump achieves efficient pressurization of fluids with different viscosities. Dynamically adjusting the blade angle can effectively reduce fluid flow separation and eddies, significantly improve energy conversion efficiency, and reduce flow resistance by precisely controlling the flow channel matching in the diffuser. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall design of this utility model.

[0017] Figure 2 This is a schematic diagram of the centrifugal blade in this utility model.

[0018] Figure 3 This is a schematic diagram of the adjustment mechanism in this utility model.

[0019] Figure 4 This is a schematic diagram of the diffuser blade in this utility model.

[0020] Figure 5 This is a schematic diagram of the fixing block in this utility model.

[0021] Figure 6 This is a schematic diagram of the internal gear ring in this utility model.

[0022] Figure 7 This is a schematic diagram of the outer shell of this utility model.

[0023] In the diagram: 1 - Outer shell, 101 - Lower outer shell, 102 - Upper outer shell, 103 - Inlet, 104 - Outlet, 2 - Shaft, 3 - Bearing, 4 - Sealing ring, 5 - Centrifugal blade, 501 - Diffuser, 502 - Diffuser blade, 5021 - Cylindrical shaft, 5022 - Square shaft, 503 - Centrifugal fan blade, 504 - Adjustment mechanism, 5041 - First connecting rod, 5042 - Second connecting rod, 5043 - Fixing block, 5044 - Internal gear ring, 50441 - Threaded hole, 5045 - Drive gear, 5046 - Screw motor, 5047 - Connecting groove, 5048 - Locking rod, 5049 - Wing plate, 50410 - Through hole, 505 - Conduit. Detailed Implementation

[0024] The following will refer to the appendix in the example of this utility model. Figure 1 - Appendix Figure 7 The technical solutions in the embodiments of this utility model are clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] like Figure 1As shown, this utility model provides a technical solution: a high-speed multistage centrifugal pump, including a housing 1, a bearing 3 installed inside the housing 1, a sealing ring 4 fixed to the side of the bearing 3, a rotating shaft 2 fixed inside the bearing 3, and centrifugal blades 5 fixed to the outside of the rotating shaft 2. The housing 1 serves as the external protective structure of the centrifugal pump, accommodating and supporting the various internal components while isolating it from the external environment to prevent fluid leakage. The upper housing 102 is provided with an inlet 103 for introducing the fluid to be pressurized; the lower housing 101 is provided with an outlet 104 on its side for discharging the pressurized fluid. This provides a closed and stable space for the operation of the centrifugal pump, ensuring that the fluid flows within the pump along a predetermined path, achieving fluid pressurization and transportation. The rotating shaft 2, as the core rotating component of the centrifugal pump, connects to the centrifugal blades 5, transmitting the mechanical energy of the drive device to the centrifugal blades 5, driving the centrifugal blades to rotate at high speed. This allows the centrifugal blades 5 to rotate stably under the support of the bearing, thereby applying centrifugal force to the fluid, achieving fluid pressurization and transportation. It is a key component for transmitting power to the centrifugal blades 5 and enabling them to function. Bearing 3 supports shaft 2, enabling it to rotate stably at high speed within housing 1. This reduces friction and wear during shaft 2 rotation and withstands radial and axial forces. It ensures the rotational accuracy and stability of shaft 2, reduces energy loss, extends the service life of shaft 2 and other related components, and guarantees efficient and reliable operation of the centrifugal pump. Sealing ring 4 is installed on the side of bearing 3, primarily to prevent fluid leakage from the gap between shaft 2 and housing 1, and also to prevent external air or impurities from entering the pump. This improves the pump's sealing performance, reduces fluid leakage losses, ensures stable pressure and flow rate within the pump, and avoids potential environmental pollution and energy waste caused by leakage.

[0026] like Figure 2As shown, the centrifugal pump 5 includes a diffuser 501 fixed inside the housing 1, a diffuser blade 502 installed in the middle of the diffuser 501, a centrifugal fan blade 503 fixed on the rotating shaft 2, an adjustment mechanism 504 fixed on the side of the diffuser 501, and a conduit 505 fixed on the side of the adjustment mechanism 504. The diffuser 501 is fixed inside the housing 1 and does not rotate. It is used to collect the fluid thrown out by the centrifugal fan blade 503 and convert the kinetic energy of the fluid into pressure energy, while guiding the fluid to the outlet. This slows down and pressurizes the fluid inside the diffuser 501, increases the pressure energy of the fluid, reduces the turbulence of the fluid flow, optimizes the flow path of the fluid, and improves the energy conversion efficiency of the centrifugal pump. A diffuser blade 502 is installed in the middle of the diffuser 501. By changing the blade angle, the flow channel shape within the diffuser 501 is adjusted to adapt to the flow characteristics of fluids with different viscosities. The blade angle is adjusted in real time according to the fluid viscosity, making the fluid flow within the diffuser 501 more closely follow the blade profile, reducing flow separation and eddies, lowering flow resistance, improving energy conversion efficiency, and enhancing the centrifugal pump's pressurization capacity for different media. Centrifugal fan blades 503 are fixed to the rotating shaft 2 and rotate with it. Through centrifugal force, they throw the fluid from near the rotating shaft 2 towards the diffuser 501, giving the fluid kinetic energy. This is the direct component of the centrifugal pump that generates centrifugal force, providing initial acceleration of the fluid and laying the foundation for the subsequent pressurization process in the diffuser 501. Its shape and size affect the centrifugal pump's flow rate and head. An adjustment mechanism 504 is installed on the side of the diffuser 501 to adjust the angle of the diffuser blades 502, achieving adaptive adjustment for fluids with different viscosities. The angle of the diffuser blades 502 is precisely adjusted via an electric drive mechanism, enabling the centrifugal pump to automatically adjust its operating state according to the characteristics of the fluid, thereby improving the pump's operating efficiency and adaptability. A conduit 505 is fixed to the side of the adjustment mechanism 504 to protect and organize the electrical wires connecting to the adjustment mechanism 504.

[0027] like Figure 3As shown, the adjustment mechanism 504 includes a first connecting rod 5041 mounted on the diffuser blade 502, a second connecting rod 5042 mounted at the end of the first connecting rod 5041, a fixing block 5043 mounted at the end of the second connecting rod 5042, an internal gear ring gear 5044 bolted inside the fixing block 5043, a drive gear 5045 meshing with the internal gear ring gear 5044, and a screw motor 5046 fixed at the lower end of the drive gear 5045. The screw motor 5046 has self-locking properties, which ensures the stability of the diffuser blade 502 under high-speed fluid impact and ensures that the diffuser blade 502 can be locked after being adjusted to a set angle without the need for the motor to continuously work to lock the diffuser blade 502. The drive gear 5045 meshes with the internal gear ring gear 5044 and is driven by the screw motor 5046, transmitting the rotational motion of the screw motor 5046 to the internal gear ring gear 5044. The internal gear ring 5044 is bolted inside the fixed block 5043 and meshes with the drive gear 5045. Its rotation drives the first connecting rod 5041 and the diffuser blade 502, thus adjusting the angle of the diffuser blade 502. The rotational motion of the drive gear 5045 is converted into the angle adjustment motion of the diffuser blade 502; its number of teeth and transmission ratio determine the accuracy and range of the diffuser blade angle adjustment. As the fixed block 5043 rotates with the internal gear ring 5044, it drives the second connecting rod 5042 to move. Simultaneously, the second connecting rod 5042 pushes and pulls the end of the first connecting rod 5041, causing the first connecting rod 5041 to rotate the diffuser blade 502.

[0028] like Figure 4 As shown, cylindrical shafts 5021 are provided at both ends of the diffuser blade 502, and a square shaft 5022 is provided at the connection between the cylindrical shafts 5021 and the first connecting rod 5041. The cylindrical shafts 5021 are located at both ends of the diffuser blade 502, providing rotational support for the diffuser blade 502, allowing the diffuser blade 502 to rotate around its axis. This ensures the rotational flexibility of the diffuser blade 502, allowing the blade to adjust its angle as needed to adapt to different working conditions. The square shaft 5022 is located at the connection between the cylindrical shaft 5021 and the first connecting rod 5041, connecting the first connecting rod 5041 and transmitting the driving force of the adjusting mechanism 504, enabling the diffuser blade 502 to rotate. This realizes the power transmission between the adjusting mechanism 504 and the diffuser blade 502, ensuring that the diffuser blade 502 can accurately adjust its angle according to the instructions of the adjusting mechanism 504.

[0029] like Figure 5 As shown, a connecting groove 5047 is provided on the upper end of the fixing block 5043, and a locking rod 5048 is inserted into the connecting groove 5047; the connecting groove 5047 is used to install the second connecting rod 5042, and the locking rod 5048 is used to fix the second connecting rod 5042 to the fixing block 5043.

[0030] likeFigure 5 As shown, a wing plate 5049 is provided at the lower end of the fixing block 5043, and a through hole 50410 is provided on the wing plate 5049; the wing plate 5049 is used to fix the internal gear ring gear 5044, and the through hole 50410 is used to pass a bolt, so that the bolt meshes with the threaded hole 50441, ensuring that the internal gear ring gear 5044 is fixed on the fixing block 5043.

[0031] like Figure 6 As shown, the internal gear ring 5044 has a pair of threaded holes 50441 on its back side; the threaded holes 50441 are used to fix the internal gear ring 5044 to the wing plate 5049.

[0032] like Figure 7 As shown, the outer shell 1 is divided into an upper shell 102 and a lower shell 101. The upper shell 102 is provided with a water inlet 103, and the lower shell 101 is provided with a water outlet 104 on its side. The upper shell 102 and the lower shell 101 are fixed with bolts to ensure their tightness and prevent water leakage. The water inlet 103 is the liquid inlet of the device, and the water outlet 104 is the liquid outlet of the device.

[0033] Working principle:

[0034] After the liquid enters through the inlet 103, it undergoes centrifugal action by the centrifugal fan blade 503 and then through the diffuser blade 502, converting kinetic energy into pressure energy. After multiple stages of pressurization, it flows out through the outlet 104.

[0035] When encountering liquids with different viscosities, it is often necessary to adjust the angle of the diffuser blade 502. (For low-viscosity fluids, the flow resistance is small, and a larger diffusion angle (such as 8° to 12°) can more effectively convert kinetic energy into pressure energy while reducing the risk of flow separation. For high-viscosity fluids, the frictional resistance increases significantly, and an excessively large diffusion angle will exacerbate flow separation and eddies, leading to a sharp increase in energy loss. Studies have shown that the optimal diffusion angle for high-viscosity fluids may be reduced to 6° to 8°.) At this time, the screw motor 5046 starts to rotate, driving the internal gear ring 5044 to rotate. Because the fixed block 5043 is fixed on the internal gear ring 5044, it will rotate together with the internal gear ring 5044. When the fixed block 5043 rotates, it will drive the end of the second connecting rod 5042 to make a circular motion around the end of the first connecting rod 5041, thereby driving the diffusion blade 502 to rotate and adjusting the diffusion angle.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-speed multistage centrifugal pump, characterized in that, It includes a housing (1), a bearing (3) installed inside the housing (1), a sealing ring (4) fixed to the side of the bearing (3), a rotating shaft (2) fixed inside the bearing (3), and centrifugal blades (5) fixed to the outside of the rotating shaft (2); The centrifugal blade (5) includes a diffuser (501) fixed inside the housing (1), a diffuser blade (502) installed in the middle of the diffuser (501), a centrifugal fan blade (503) fixed on the rotating shaft (2), an adjustment mechanism (504) fixed on the side of the diffuser (501), and a conduit (505) fixed on the side of the adjustment mechanism (504).

2. The high-speed multistage centrifugal pump according to claim 1, characterized in that, The adjustment mechanism (504) includes a first connecting rod (5041) mounted on the diffuser blade (502), a second connecting rod (5042) mounted at the end of the first connecting rod (5041), a fixing block (5043) mounted at the end of the second connecting rod (5042), an internal gear ring gear (5044) bolted inside the fixing block (5043), a drive gear (5045) meshing with the internal gear ring gear (5044), and a screw motor (5046) fixed at the lower end of the drive gear (5045).

3. A high-speed multistage centrifugal pump according to claim 1, characterized in that, The diffuser blade (502) is provided with cylindrical rotating shafts (5021) at both ends, and a square rotating shaft (5022) is provided at the connection between the cylindrical rotating shaft (5021) and the first connecting rod (5041).

4. A high-speed multistage centrifugal pump according to claim 2, characterized in that, The upper end of the fixing block (5043) is provided with a connecting groove (5047), and a locking rod (5048) is inserted into the connecting groove (5047).

5. A high-speed multistage centrifugal pump according to claim 2, characterized in that, The lower end of the fixing block (5043) is provided with a wing plate (5049), and the wing plate (5049) is provided with a through hole (50410).

6. A high-speed multistage centrifugal pump according to claim 2, characterized in that, The internal gear ring (5044) has a pair of threaded holes (50441) on its back side.

7. A high-speed multistage centrifugal pump according to claim 1, characterized in that, The outer shell (1) is divided into an upper shell (102) and a lower shell (101). The upper shell (102) is provided with a water inlet (103), and the lower shell (101) is provided with a water outlet (104) on its side.

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