Efficient and stable integrated pump hydraulic structure

Abstract

The invention relates to an efficient and stable integrated pump hydraulic structure which comprises an integrated pump, the integrated pump is composed of an impeller, a space guide vane, a rectification grid and a rectification guide vane, and the space guide vane is of a long vane and short vane structure. And the short blade is positioned between the two long blades and is formed by cutting off and offsetting the long blades at the inlet position of the short blade. The hydraulic structure of the integrated pump adopts the space guide vane with a long and short vane structural form, and compared with a traditional space guide vane structure, flow separation in the space guide vane can be effectively restrained, flow excitation energy is reduced, the overall efficiency of the pump is improved, pressure pulsation energy is reduced, and finally the purpose of efficient and stable design is achieved.

Description

Technical Field

[0001] The invention relates to a centrifugal pump structure, in particular to an integrated pump hydraulic structure. Background Art

[0002] Centrifugal pumps are widely used in various fields of the national economy. Their high efficiency and stability have always been the goals pursued by designers. In some special fields, the integrated design of centrifugal pumps has become a development goal. At this time, the pump and the motor are integrated into an integrated structure, thereby reducing the size of the pump and completing the engineering application. In addition, with the continuous improvement of the vibration and noise indicators of the pump, the vibration and noise level of the integrated pump is subject to strict requirements. How to control the flow excitation level in the integrated pump is one of the difficulties in pump design.

[0003] The traditional integrated pump adopts the structure of impeller and space guide vane matching. Due to the limitation of the integrated pump structure, the space guide vane has no contraction section. At this time, the diffusion loss of the space guide vane is serious, resulting in low pump efficiency. Affected by the diffusion flow, large-scale flow separation structure is prone to appear in the pump, resulting in high-amplitude velocity and pressure pulsation, affecting the vibration and noise level of the pump. Therefore, the key to improving the efficiency of the integrated pump and reducing the flow excitation energy in the pump lies in how to complete the hydraulic design of the pump, especially the design of the space guide vane.

[0004] In view of the problems of low efficiency and high pressure pulsation in the integrated pump design existing in the above engineering practice, it is necessary to innovatively design a special spatial guide vane structure. After using short blades, the flow separation in the pump can be effectively controlled, the efficiency of the pump can be improved and the pressure pulsation level can be reduced, ultimately achieving the goal of efficient and stable integrated pump design. Summary of the invention

[0005] The present invention proposes an efficient and stable integrated pump hydraulic structure, which adopts a space guide vane with a long and short blade structure. Compared with the traditional space guide vane structure, it can effectively suppress the flow separation inside the space guide vane, reduce the flow energy, improve the overall efficiency of the pump and reduce the pressure pulsation energy, and finally achieve the purpose of efficient and stable design. The integrated pump structure has good engineering application value.

[0006] To achieve the above objectives, the technical solution of the present invention is: an efficient and stable integrated pump hydraulic structure, including an integrated pump, the integrated pump is composed of an impeller, a space guide vane, a rectifier grid and a rectifier guide vane, and the space guide vane has a long blade and a short blade structure.

[0007] Further, the short blade is located between the two long blades, which is formed by truncating and offsetting the long blade at the inlet position of the short blade.

[0008] Furthermore, the number of the long blades and the short blades of the space guide vane is the same.

[0009] Furthermore, the length of the short blade is 20% to 60% of the length of the entire long blade.

[0010] Further, the number of the long blades is n, and the offset angle of the short blades is 360 / 4n-360 / 1.5n.

[0011] Furthermore, the impeller used in the integrated pump adopts an impeller long blade structure, a short blade structure, or a single impeller long blade structure.

[0012] Furthermore, the rectifying grid is composed of a plurality of rectifying grid blades, and the rectifying guide vane is composed of a plurality of rectifying guide vane blades, which are used to rectify the flow.

[0013] The beneficial effects of the present invention are:

[0014] The present invention innovatively proposes a spatial guide vane with a short blade structure, which cooperates with an impeller, a rectifying grid, and a rectifying guide vane to form a hydraulic structure of an integrated pump. The spatial guide vane is composed of long and short blades, the number of long blades and short blades is the same, and the short blades are formed by truncating and offsetting the long blades at appropriate positions. The length of the short blades affects the effect of flow separation control and its control of pressure pulsation. The present invention can effectively suppress the flow separation caused by sudden diffusion of the area through the spatial guide vanes designed with long and short blades, thereby suppressing the flow loss and the resulting high-amplitude pressure pulsation energy, and ultimately achieve the purpose of efficient and stable integrated pump design. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an axial projection diagram of the efficient and stable integrated pump hydraulic structure of the present invention;

[0016] Figure 2 A three-dimensional diagram of the efficient and stable integrated pump hydraulic structure of the present invention;

[0017] Figure 3 A three-dimensional diagram of the space guide vanes of the efficient and stable integrated pump hydraulic structure of the present invention;

[0018] Figure 4 This is a three-dimensional diagram of a conventional space guide vane. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] like Figures 1 to 3As shown, the present invention innovatively proposes a space guide vane with a short blade structure, which cooperates with the impeller 1, the rectifying grid 3, and the rectifying guide vane 4 to form the hydraulic structure of the integrated pump. The space guide vane 2 is composed of long blades 5 and short blades 6. The number of long blades 5 and short blades 6 is the same. The short blade 6 is formed by truncating and offsetting the long blade 6 at a suitable position 9. The length of the short blade 6 affects the effect of flow separation control and its control of pressure pulsation, which is 20% to 60% of the length of the long blade 5. The short blade 6 is located between the two long blades 5, and its offset angle range is 360 / 4n-360 / 1.5n, where n is the number of long blades 5. The impeller used in the integrated pump can adopt the impeller long blade 7 and the impeller short blade 8 structural design type, or it can be designed with a single impeller long blade 7. The main purpose of the rectifying grid 3 and the rectifying guide vane 4 is to complete the rectification of the fluid, and the number of its blades can be selected according to actual conditions.

[0021] Example: Figure 1 An axial projection diagram of an efficient and stable integrated pump hydraulic structure is given. Figure 1 It can be seen that the integrated pump is composed of an impeller 1, a space guide vane 2, a rectifying grid 3, and a rectifying guide vane 4. The space guide vane 2 is composed of a long blade 5 and a short blade 6, and the short blade 6 is formed by cutting and rotating the long blade 5 at the inlet position 9. Figure 2 From the three-dimensional diagram of an efficient and stable integrated pump hydraulic structure, it can be seen that the impeller 1 is composed of 12 long impeller blades 7 and short impeller blades 8, the rectifier 3 is composed of 14 rectifier blades, and the rectifier guide vane 4 is composed of 7 rectifier guide vane blades. Figure 3 From the three-dimensional diagram of the spatial guide vane of an efficient and stable integrated pump hydraulic structure, it can be seen that the spatial guide vane 2 proposed in the present invention has a structure of long blades 5 and short blades 6. The length of the short blade 6 is 50% of the long blade 6, and it is located exactly in the middle of the two long blades 6. The number of long blades of the spatial guide vane 2 is 7, and the offset angle of the short blade 6 is 360 / 2 / 7=25.7°.

[0022] Figure 4 It is a three-dimensional diagram of a conventional space guide vane. It can be seen from the figure that the guide vane does not have short blades, which is significantly different from the present invention.

Claims

1. An efficient and stable integrated pump hydraulic structure, characterized by: The integrated pump comprises an impeller, a space guide vane, a rectifying grid and a rectifying guide vane. The space guide vane has a long blade and a short blade structure.

2. The efficient and stable integrated pump hydraulic structure according to claim 1 is characterized in that: The short blade is located between the two long blades, and is formed by truncating and offsetting the long blade at the inlet position of the short blade.

3. The efficient and stable integrated pump hydraulic structure according to claim 1 is characterized in that: The space guide vane has the same number of long blades and short blades.

4. The efficient and stable integrated pump hydraulic structure according to claim 3 is characterized by: The length of the short blade is 20% to 60% of the length of the entire long blade.

5. The efficient and stable integrated pump hydraulic structure according to claim 2 is characterized in that: The number of long blades is n, and the offset angle of the short blades is 360 / 4n-360 / 1.5n.

6. The efficient and stable integrated pump hydraulic structure according to claim 1 is characterized by: The impeller used in the integrated pump adopts an impeller long blade structure, a short blade structure, or a single impeller long blade structure.

7. The efficient and stable integrated pump hydraulic structure according to claim 1 is characterized in that: The rectifying grid is composed of a plurality of rectifying grid blades, and the rectifying guide vane is composed of a plurality of rectifying guide vane blades, which are used to rectify the flow.

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