Efficient low-vibration centrifugal pump space guide vane

Abstract

The utility model relates to a high-efficiency low-vibration centrifugal pump space guide vane which comprises a flow guide shell upper shell, a blade of the space guide vane and a flow guide shell lower shell, and the flow guide shell upper shell, the flow guide shell lower shell and the twisted guide vane are integrally formed. The bent guide blades are evenly arranged on the flow guide shell in the circumferential direction. According to the space guide vane of the guide vane structure, the reserved annular diffusion cavity with a certain length is formed between the impeller outlet and the guide vane inlet, liquid enters the guide vane after the flow speed of the liquid is reduced through the front annular diffusion cavity, the impact loss of the space guide vane inlet can be effectively reduced, and the service life of the space guide vane is prolonged. Therefore, the acting force of liquid on the inlet edge of the spatial guide vane is effectively reduced; and meanwhile, the front annular diffusion cavity with the proper axial length cannot increase the liquid diffusion loss, the liquid flow is restrained and guided in time through the guide blades, and the efficiency and the vibration performance of the centrifugal pump are improved.

Description

Technical Field

[0001] The utility model relates to a space guide vane, in particular to a high-efficiency and low-vibration centrifugal pump space guide vane which can effectively reduce the liquid flow rate in the front cavity of the space guide vane, thereby effectively reducing the force of the liquid on the inlet edge of the space guide vane blade, and improving the efficiency and vibration level of the centrifugal pump. Background Art

[0002] A centrifugal pump transports liquid through the centrifugal force generated by the rotation of the impeller. Its main working principle is to use the centrifugal force to make the liquid rotate rapidly in the pump body, thereby increasing the kinetic energy of the liquid, and then convert the kinetic energy into pressure energy through the guide components, thereby reducing flow losses and ensuring efficient liquid transportation.

[0003] Common guide components of centrifugal pumps include volutes and guide vanes. Guide vanes can be divided into radial guide vanes, channel guide vanes and space guide vanes. They all have the function of changing the direction and speed of fluid flow, but there are some differences in specific design and use.

[0004] The radial guide vane is composed of positive guide vanes, annular spaces and reverse guide vanes. The positive guide vanes act as water pressure chambers. In addition to reducing the fluid velocity and eliminating the rotational component, the reverse guide vanes also play the role of introducing the liquid into the suction chamber of the lower impeller. They are mainly used in segmental multistage pumps; the channel guide vane is composed of several independent flow channels. It can be said that the positive guide vanes, transition sections and reverse guide vanes of the radial guide vanes are integrated into a closed and continuously changing flow channel. The processing and manufacturing of the channel guide vane are more complicated than those of the radial guide vanes. They are mainly used in important high-pressure multistage pumps; the space guide vane is similar to the channel type. The positive and reverse guide vanes are integrated into one, usually composed of a series of fixed guide vanes. These guide vanes can guide the fluid to flow along a specific path and convert the kinetic energy of the fluid into pressure energy so that it can be pumped out smoothly. The blades are spatially twisted and are mainly used in well pumps and guide vane mixed flow pumps.

[0005] The design and selection of the spatial guide vane of the pump directly affect the performance parameters of the pump, such as flow rate, head, efficiency, etc. The spatial guide vane guides the liquid from the outlet of the first-stage impeller to the inlet of the secondary impeller, so that the flow direction of the liquid is consistent with the flow direction of the impeller. This can reduce the vortex in the inlet speed and direction, reduce the inlet flow resistance, and improve the inlet efficiency; the position, angle and shape of the spatial guide vane can change the cross-sectional area of ​​the inlet flow channel, thereby controlling the flow rate. Proper adjustment of the guide vane position and angle can make the centrifugal pump adaptable under different working conditions and improve the operating efficiency of the system; the spatial guide vane can change the flow direction of the liquid, and the flow area between the blades of the spatial guide vane is diffused, so that kinetic energy can be converted into pressure energy, thereby increasing the head of the pump. In general, the spatial guide vane plays the role of guiding, regulating and increasing the head of the pump in the centrifugal pump, which can improve the efficiency and performance of the pump and adapt it to the fluid transportation requirements of different working conditions. Reasonable spatial guide vane design can reduce the eddy loss of the fluid, improve the efficiency of the pump, and also reduce the noise and vibration of the pump. Utility Model Content

[0006] In view of the above problems, the main purpose of the utility model is to provide a high-efficiency, low-vibration centrifugal pump spatial guide vane that can effectively reduce the liquid flow velocity in the front cavity of the spatial guide vane, thereby effectively reducing the force of the liquid on the inlet edge of the spatial guide vane blade, and improving the efficiency and vibration level of the centrifugal pump.

[0007] The utility model solves the above technical problems through the following scheme: a high-efficiency and low-vibration centrifugal pump space guide vane, the high-efficiency and low-vibration centrifugal pump space guide vane comprises: a guide shell upper shell, guide blades and a guide shell lower shell.

[0008] In a specific implementation example of the present utility model, the guide shell upper shell, the guide vanes and the guide shell lower shell are integrally formed.

[0009] In a specific implementation example of the present utility model, the upper and lower ends of the guide vanes are evenly arranged on the guide shell upper shell and the guide shell lower shell along the circumferential direction.

[0010] In a specific implementation example of the present utility model, the space guide vane is installed between the impeller outlet and the guide vane inlet, and an annular diffusion chamber of a certain length is formed between the impeller outlet and the guide vane inlet.

[0011] In a specific implementation example of the present utility model, the number of guide blades is 6-13.

[0012] In a specific implementation example of the present utility model, the guide vane is a guide vane with a three-dimensional twisted structure.

[0013] In a specific implementation example of the present utility model, the number of guide vanes and the number of impeller blades are coprime.

[0014] In a specific implementation example of the present utility model, the thickness of the guide vane is 1 / 5-3 / 5 of the thickness of the guide shell of the centrifugal pump space guide vane.

[0015] In a specific implementation example of the present utility model, the thickness variation of the inlet and outlet edges of the guide vanes is streamlined.

[0016] In a specific implementation example of the present utility model, the axial length L of the guide shell of the centrifugal pump space guide vane is 0.7-0.9 times the outer diameter dimension D2 of the impeller.

[0017] In a specific implementation example of the utility model, the wall thickness of the guide shell upper shell and the guide shell lower shell is 2-3 times the wall thickness of the guide vane.

[0018] In a specific implementation example of the present invention, the axial length L1 of the guide vane inlet edge from the impeller outlet center is 7% of the guide vane axial length L, and the axial length of the guide vane outlet edge from the guide casing outlet is 14% of the guide vane axial length L.

[0019] The positive progressive effect of the utility model is that the high-efficiency and low-vibration centrifugal pump space guide vanes provided by the utility model and the space guide vanes of the annular diffusion chamber with suitable axial length can effectively reduce the liquid flow velocity in the front chamber of the space guide vanes, thereby effectively reducing the force of the liquid on the inlet edge of the space guide vane blades. At the same time, the space guide vanes can timely restrain and guide the liquid flow, thereby improving the efficiency and vibration level of the centrifugal pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a part diagram (cross-sectional view) of the space guide vane of the present utility model.

[0021] Figure 2 It is a three-dimensional oblique view of the space guide vane of the utility model.

[0022] Figure 3 Axial view of the space guide vane of the utility model.

[0023] Figure 4 The CFD calculated flow-head curves under five types of spatial guide vanes: A, B, C, D, and E.

[0024] Figure 5 The CFD calculated flow-efficiency curves under five types of spatial guide vanes: A, B, C, D, and E.

[0025] Figure 6 The static pressure distribution diagram of the cascade under the five types of spatial guide vanes A, B, C, D, and E calculated by CFD.

[0026] The following are the names corresponding to the label numbers in this utility model:

[0027] The guide shell upper shell 101, the guide vanes 102, the guide shell lower shell 103, and the guide shell 104. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to illustrate the technical solution of the present invention in detail.

[0029] Figure 1 This is a part diagram (sectional view) of the space guide vane of the utility model. Figure 2 This is a three-dimensional oblique view of the space guide vane of the utility model. Figure 3 The axial view of the space guide vane of the utility model is as follows: Figure 1 , 3 As shown: the utility model provides a high-efficiency and low-vibration centrifugal pump space guide vane, comprising a guide shell upper shell 101, a guide vane 102 and a guide shell lower shell 103; the guide shell upper shell 101, the guide vane 102 and the guide shell lower shell 103 are integrally formed; the upper and lower ends of the guide vane 102 are evenly arranged on the guide shell upper shell 101 and the guide shell lower shell 103 along the circumferential direction. The number of the guide vanes 102 is 6-13. In the specific implementation process, the number of the guide vanes 102 is coprime with the number of the impeller blades, and the guide vanes 102 are guide vanes of a three-dimensional twisted structure.

[0030] The utility model reserves an annular diffusion chamber of a certain length between the impeller outlet and the guide vane inlet. The liquid enters the guide vane after the flow velocity is reduced after passing through the front annular diffusion chamber, which can effectively reduce the impact loss at the inlet of the space guide vane, thereby effectively reducing the force of the liquid on the inlet edge of the space guide vane blade; at the same time, the front annular diffusion chamber with a suitable axial length will not increase the liquid diffusion loss, and the guide vane can timely restrain and guide the liquid flow, thereby improving the efficiency and vibration performance of the centrifugal pump.

[0031] In the present invention, the thickness of the guide vane 102 is 1 / 5-3 / 5 of the thickness of the guide shell 104 of the centrifugal pump space guide vane, the axial length L of the guide shell of the centrifugal pump space guide vane is 0.7-0.9 times the outer diameter D2 of the impeller, and the wall thickness of the guide shell upper shell 101 and the guide shell lower shell 103 is 2-3 times the wall thickness of the guide vane 102. Other values ​​or ranges can be selected for the above parameters according to specific circumstances.

[0032] The thickness variation of the inlet and outlet edges of the guide vane 102 of the present invention is streamlined.

[0033] The axial length L1 of the guide vane inlet edge from the impeller outlet center is approximately 7% of the guide vane axial length L, and the axial length L-L2 of the guide vane outlet edge from the guide casing outlet is approximately 14% of the guide vane axial length L.

[0034] The following is an example of a centrifugal pump with a single-stage single-suction space guide vane structure, where the impeller is a closed impeller, in a specific implementation example of the present utility model:

[0035] The relevant parameters of the water pump, impeller and guide vane are as follows: Water pump flow Q = 600m 3 / h, head H = 40m, speed n = 1450rpm, impeller outer diameter D2 = 800mm, impeller outlet width B2 = 60mm, shaft diameter D h =140mm, impeller inlet diameter D j =420mm, number of blades z=7, guide vane outlet diameter D3=420mm, number of guide vane blades 9. As shown in the following table, five guide vane blade schemes with different axial lengths are designed. Except for the inlet edge position and axial length, the other five guide vane schemes are consistent. The same impeller is paired for full-condition CFD calculation to predict its hydraulic performance, and the flow field calculated by CFD is analyzed to reveal its internal flow field distribution law.

[0036] Guide vane solution A B C D E <![CDATA[L1 / L]]> 2％ 4％ 7％ 15％ 20％

[0037] Figure 4 The CFD calculation flow-head curves for five types of space guide vanes, ABCDE, Figure 5 The CFD calculation flow-efficiency curves for five types of space guide vanes are shown in Figure ABCDE. Figure 5 It can be seen that schemes C and D have the highest calculated hydraulic efficiency.

[0038] Figure 6 The static pressure distribution diagram of the cascade calculated by CFD under five kinds of spatial guide vanes A, B, C, D, and E. According to the static pressure distribution diagram, we can see that under the utility model, the guide vane inlet pressure distribution of scheme C is more uniform, the pressure gradient is smaller, the pressure change is smoother, and the overall flow field is better.

[0039] Through the above design, the guide vane scheme C of the utility model can effectively reduce the liquid flow rate in the front cavity of the space guide vane, and at the same time timely constrain and guide the fluid to flow out or enter the next level. The overall flow pattern is uniform, especially the flow pattern at the inlet of the space guide vane blade is better, thereby effectively reducing the force of the liquid on the inlet edge of the space guide vane blade, improving the efficiency and vibration level of the centrifugal pump, and achieving the purpose of improving the operation stability of the pump.

[0040] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected, and the scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A high-efficiency, low-vibration centrifugal pump space guide vane, characterized in that: The high-efficiency and low-vibration centrifugal pump space guide vane comprises: a guide shell upper shell, guide vanes and a guide shell lower shell; The guide shell upper shell, guide vanes and guide shell lower shell are integrally formed; The upper and lower ends of the guide vanes are evenly arranged on the guide shell upper shell and the guide shell lower shell along the circumferential direction.

2. The high-efficiency, low-vibration centrifugal pump space guide vane according to claim 1 is characterized by: The space guide vane is installed between the impeller outlet and the guide vane inlet, and an annular diffusion chamber of a certain length is formed between the impeller outlet and the guide vane inlet.

3. The high-efficiency, low-vibration centrifugal pump space guide vane according to claim 1 is characterized by: The number of guide blades is 6-13.

4. The high-efficiency, low-vibration centrifugal pump space guide vane according to claim 1 is characterized by: The guide vane is a guide vane with a three-dimensional twisted structure.

5. The high-efficiency, low-vibration centrifugal pump space guide vane according to claim 1 is characterized by: The number of guide vanes is coprime to the number of impeller blades.

6. The high-efficiency, low-vibration centrifugal pump space guide vane according to claim 1 is characterized by: The thickness of the guide vane is 1 / 5-3 / 5 of the thickness of the guide shell of the centrifugal pump space guide vane.

7. The high-efficiency, low-vibration centrifugal pump space guide vane according to claim 1 is characterized by: The thickness variation of the inlet and outlet edges of the guide vanes is streamlined.

8. The high-efficiency, low-vibration centrifugal pump space guide vane according to claim 1 is characterized by: The axial length L of the guide shell of the centrifugal pump space guide vane is 0.7-0.9 times the outer diameter D2 of the impeller.

9. The high-efficiency, low-vibration centrifugal pump space guide vane according to claim 1, characterized in that: The wall thickness at the guide shell upper shell and the guide shell lower shell is 2-3 times the wall thickness at the guide vane.

10. The high-efficiency, low-vibration centrifugal pump space guide vane according to claim 1, characterized in that: The axial length L1 of the guide vane inlet edge from the impeller outlet center is 7% of the guide vane axial length L, and the axial length of the guide vane outlet edge from the guide casing outlet is 14% of the guide vane axial length L.

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