Guide vane designing method for improving stability of multistage pump

A design method and stability technology, applied to components, pumps, and pump components of pumping devices used for elastic fluids, can solve problems such as waste of resources and increased production costs, and achieve reduced vibration amplitude and good support , the effect of reducing the deflection of the shaft

Inactive Publication Date: 2015-09-02
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies in the prior art that increase the bearing stiffness to avoid vibration of the multistage pump and cause increased production costs and waste of resources, the present invention provides a guide vane design method for improving the stability of the multistage pump, aiming to achieve a lower cost of use. Low cost, less resource consumption and can effectively improve the stability of multi-stage pumps

Method used

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  • Guide vane designing method for improving stability of multistage pump
  • Guide vane designing method for improving stability of multistage pump
  • Guide vane designing method for improving stability of multistage pump

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Embodiment 1: choose the impeller of the whole machine that the number of impeller blades is 8, the number of guide vane blades is 11 and the guide vane of the straight groove-shaped groove structure is opened, wherein, the number of straight grooves is 3, and the groove width at the guide vane hub is b=0.8mm, the distance between two adjacent grooves is t=0.85mm, and the groove thickness δ=0.25mm. After assembling the impeller and guide vane of the whole machine, the displacement sensor is installed horizontally on the pump body by a vibration test instrument (Bentley vibration test instrument, etc.), so as to monitor the vibration during the operation of the multi-stage pump. from Figure 7 It can be seen that the vibration amplitude is improved by opening the slot structure at the hub of the common guide vane, and the amplitude at 725Hz is 7.21mm / s.

[0048] Compared Image 6 and Figure 7 It can be concluded that the guide vanes with straight grooves design...

Embodiment 2

[0049] Embodiment 2: choose the impeller of the whole machine that the number of impeller blades is 8, and the number of guide vanes is 12 guide vanes without slotting mechanism, and after it is assembled, the displacement sensor is leveled by a dynamic test instrument (Bentley vibration test instrument, etc.). Installed on the pump body to monitor the vibration during the operation of the multi-stage pump. from Figure 8 It can be seen that when the number of guide vanes is changed from being coprime to the number of impeller blades to have a common divisor of 4, its amplitude at 725Hz is 5.60mm / s, compared with Image 6 In other words, the amplitude is significantly reduced, indicating that the guide vane with the largest common divisor of the impeller and guide vane blades designed by this design method can effectively reduce the vibration amplitude.

Embodiment 3

[0050] Embodiment 3: choose the impeller of the whole machine that the number of impeller blades is 8, the number of guide vane blades is 12 and the guide vane of the straight groove-shaped groove structure is opened, wherein, the number of straight grooves is 3, and the groove width at the guide vane hub is b=0.8mm, the distance between two adjacent grooves is t=0.85mm, and the groove thickness δ=0.25mm. After it is assembled, the displacement sensor is installed horizontally on the pump body by a dynamic test instrument (Bentley vibration test instrument, etc.), so as to monitor the vibration during the operation of the multi-stage pump. from Figure 9 It can be seen from the figure that the amplitude at 725Hz is 5.26mm / s at 725Hz after changing the number of guide vane blades and at the same time slotting at the guide vane hub. Image 6 In other words, it shows that the guide vanes with straight grooves designed by this design method and the number of impeller vanes an...

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Abstract

The invention provides a guide vane designing method for improving stability of a multistage pump. The guide vane designing method includes the following steps: determining geometric parameters of guide vanes, acquiring a basic guide vane model from three-dimensional modeling software according to the geometric parameters, and arranging multiple groove structures at guide vane hubs of the guide vane basic model to acquire a final guide vane model; acquiring final guide vanes by means of die opening and casting according to the final guide vane model. According to the guide vane designing method, the guide vanes in a proper number are selected in the process of designing the guide vanes, and maximum 2, 3 or 4 common divisor exists between the proper number and number of impeller vanes, so that flowing inside the multistage pump can present obvious regularity, and the objective of lowering vibrating amplitude of the multistage pump is achieved; the groove structures are arranged at the guide vane hubs, so that large radial water power is generated at the guide vane hubs of the multistage pump, good supporting effect is realized, and stability of the multistage pump is improved.

Description

technical field [0001] The invention belongs to the technical field of guide vanes of multistage pumps, and in particular relates to a design method of guide vanes for improving the stability of multistage pumps. Background technique [0002] For multi-stage pumps, it is easy to cause vibration due to excessive speed exceeding the critical speed of the pump. The speed at which resonance occurs is defined as the critical speed. Among them, the key factors affecting the critical speed of the pump rotor system include the disc quality of the material, elastic modulus, bearing distance, bearing characteristics, etc. For the cantilever multistage centrifugal pump, due to the influence of the gyro effect, it is easier to lose stability and generate vibration than the multistage centrifugal pump supported by two fulcrums. [0003] Conventional methods to improve the stability of the pump are: ① reduce the mass of the disc; ② increase the stiffness of the shaft; ③ when the working...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/44
Inventor 马新华冯琦王伟蒋小平张琳闫婧竹
Owner JIANGSU UNIV
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