Hub cap fin water guide cone and axial flow pump

Abstract

The utility model relates to a hub cap fin water guide cone and an axial flow pump. The water guide cone comprises a first part and a second part from bottom to top. Wherein the first part is hemispherical, and the second part is provided with a hub cap fin. And the head of the water guide cone is designed to be hemispherical and is provided with hub cap fins, so that the impact force and hydraulic loss of water flow can be reduced. The water guide holes formed in the water guide cone can change part of the flow state of the central area of the inlet of the axial flow pump, so that the strength of blade channel vortexes is reduced, the amplitude of pressure pulsation is weakened, and therefore the probability of cavitation erosion on the blades is reduced, vacuum in the middle area of the water guide cone is weakened, the pressure in the water guide cone is increased, and higher hydraulic efficiency is obtained.

Description

Technical Field

[0001] The utility model belongs to the field of fluid machinery, and in particular relates to a hub cap fin water guide cone and an axial flow pump. Background Art

[0002] Axial flow pumps with large flow and low head are widely used in the agricultural field. The water guide cone is an important component of the axial flow pump blade 220 device. It is located in front of the blade 220 and can ensure that the flow state of the axial flow pump inlet water is stable and the flow velocity is evenly distributed, thereby minimizing hydraulic losses. The hydraulic loss of the water guide cone and the hydraulic efficiency of the blade 220 both increase with the increase of the rounded length. The increase in the rounded length leads to an increase in the contact area between the water guide cone and the water flow, which leads to an increase in losses. Utility Model Content

[0003] The utility model aims to provide a hub cap fin water guide cone and an axial flow pump to overcome the above technical defects.

[0004] In order to solve the above technical problems, the utility model provides a hub cap fin water guide cone suitable for an axial flow pump, comprising:

[0005] The first part is hemispherical;

[0006] A second part, wherein the hemispherical edge of the first part is extended axially to form a cylinder to serve as the second part;

[0007] A water guide hole is provided in the second portion, and the water guide hole is an oblique blind hole to reduce blade vortex.

[0008] According to a boss cap fin water guide cone, a plurality of rows of water guide holes are provided on the cylindrical surface of the second part;

[0009] The multiple rows of water guide holes are parallel to each other;

[0010] The water guide holes in two adjacent rows are arranged in a staggered manner;

[0011] Each row of the water guide holes is evenly spaced around the circumference of the second portion.

[0012] According to a boss cap fin water guide cone, the oblique opening of the water guide hole faces the first part.

[0013] According to a hub cap fin water guide cone, a plurality of hub cap fins are installed on the cylindrical surface of the second part;

[0014] The boss cap fin is adjacent to the first portion;

[0015] A plurality of the boss cap fins are evenly spaced around the circumference of the second portion.

[0016] According to a boss cap fin water guide cone, along the water flow direction, the water guide hole is located downstream of the boss cap fin.

[0017] The utility model also provides an axial flow pump, which at least comprises a pump shaft and a hub cap fin water guide cone;

[0018] The pump shaft and the water guide cone are coaxially fixedly connected;

[0019] A plurality of blades are mounted on the pump shaft.

[0020] The utility model provides a hub cap fin water guide cone and an axial flow pump. The head of the water guide cone is designed to be hemispherical and has a hub cap fin, which can reduce the impact force of the water flow and the hydraulic loss. The water guide hole opened on the water guide cone can change the partial flow state of the central area of ​​the inlet of the axial flow pump, so that the intensity of the blade vortex is reduced and the amplitude of the pressure pulsation is weakened, thereby reducing the probability of cavitation erosion on the blade, weakening the vacuum in the middle area of ​​the water guide cone, and increasing the pressure inside the water guide cone to obtain higher hydraulic efficiency.

[0021] In order to make the above contents of the present invention more clearly understood, preferred embodiments are given below and described in detail in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the hub cap fin water guide cone.

[0023] Figure 2 It is a schematic diagram of the structure of an axial flow pump with a hub cap, fin and water guide cone.

[0024] Description of reference numerals:

[0025] 100. water guide cone; 110. first part; 120. second part; 130. water guide hole; 140. hub cap fin;

[0026] 200. Axial flow pump; 210. Pump shaft; 220. Blade. DETAILED DESCRIPTION

[0027] The following is an explanation of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0028] It should be noted that, in the present utility model, the top, bottom, left and right in the figure are regarded as the top, bottom, left and right of the boss cap fin water guide cone described in this specification.

[0029] The exemplary embodiments of the present invention are now introduced with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0030] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0031] This embodiment relates to a hub cap fin water guide cone (hereinafter referred to as water guide cone), which is suitable for an axial flow pump 200, see Figure 1 The water guide cone 100 includes a first portion 110 and a second portion 120 from bottom to top. The first portion 110 is hemispherical, or quasi-hemispherical, such as an ellipsoid; the hemispherical edge of the first portion 110 extends axially to form a cylinder as the second portion 120.

[0032] The first portion 110 and the second portion 120 may be integrally formed into the water guide cone 100 .

[0033] Please continue reading Figure 1 A water guide hole 130 is opened in the second part 120, and the water guide hole 130 is an oblique blind hole to reduce the blade vortex. Specifically, after calculation, it is found that there is an obvious blade vortex near the central axis of the inlet of the blade 220 of the axial flow pump 200, and the pressure pulsation amplitude at this location is relatively large. The role of the water guide hole 130 is to change part of the flow state in the central area of ​​the inlet of the axial flow pump 200, so that the intensity of the blade vortex is reduced, the amplitude of the pressure pulsation is weakened, and the probability of cavitation erosion on the blade 220 is reduced.

[0034] Compared with the case without the downward inclined hole (water guide hole 130 ), the presence of the water guide hole 130 effectively reduces the pressure pulsation level under high flow and high load.

[0035] Please continue reading Figure 1 A plurality of boss cap fins 140 are installed on the cylindrical surface of the second portion 120 . The boss cap fins 140 are close to the first portion 110 . The plurality of boss cap fins 140 are evenly spaced around the circumference of the second portion 120 .

[0036] That is to say, the head of the water guide cone 100 is hemispherical, and the hemispherical head cooperates with the boss cap fin 140 to reduce the impact force and hydraulic loss of the water flow, so that the water flow enters the water guide cone 100 more stably.

[0037] The number of fins of the boss cap fin 140 can be reduced or increased according to the lift.

[0038] In some embodiments, the number of fins of the boss cap fin 140 is 5, and the interval between two adjacent fins is 1 / 5D, where D is the diameter of the water guide cone 100 .

[0039] A plurality of rows of water guide holes 130 are provided on the cylindrical surface of the second portion 120 . The plurality of rows of water guide holes 130 are parallel to each other. Two adjacent rows of water guide holes 130 are staggered. Each row of water guide holes 130 is evenly spaced around the circumference of the second portion 120 .

[0040] Water flows through the water guide holes 130 of the water guide cone 100 , which can more effectively allow the water to flow into the interior of the axial flow pump 200 . The staggered arrangement of the water guide holes 130 reduces the energy loss of the water flow, increases the pressure inside the water guide cone 100 , and improves the quality of the flow field in the water guide cone 100 .

[0041] The two adjacent rows of water guide holes 130 are staggered to allow a portion of the water flowing through the water guide cone 100 to enter the axial flow pump 200 more smoothly, weakening the vacuum in the middle area of ​​the water guide cone 100 and preventing the water flows from colliding with each other, thereby obtaining higher hydraulic efficiency.

[0042] In some embodiments, the cylindrical surface of the second part 120 is provided with three rows of water guide holes 130, and two adjacent rows are staggered. The distance between two adjacent rows is 1 / 20L, where L is the total length of the water guide cone 100 (also called the rounded length), and the hole diameter is 1 / 25D, where D is the diameter of the water guide cone 100.

[0043] The oblique opening of the water guide hole 130 faces the first portion 110. The reason why the opening of the water guide hole 130 is obliquely downward is that the water flow direction is from bottom to top, and the water flow can flow through the water guide hole 130. If it is obliquely upward, the water flow will not pass through the water guide hole 130.

[0044] In the direction of water flow, the water guide hole 130 is located downstream of the boss cap fin 140. That is, the water guide hole 130 is between the blade 220 and the boss cap fin 140, because the inlet of the blade 220 is prone to generate a gap leakage vortex, and the presence of the water guide hole 130 can reduce the size of the leakage vortex.

[0045] See also Figure 2 This embodiment also provides an axial flow pump, which includes at least a pump shaft 210 and a hub cap fin water guide cone; wherein the pump shaft 210 is coaxially fixedly connected with the water guide cone 100, and a plurality of blades 220 are installed on the pump shaft 210.

[0046] according to Figure 2It can be seen that the water guide hole 130 is closer to the blade 220. This is because if the water guide hole 130 is close to the blade 220, it can play a better role in guiding the flow and destroy the vortex flow state at the entrance of the blade 220. Therefore, the water guide hole 130 needs to be between the blade 220 and the boss cap fin 140, and the water guide hole 130 is close to the blade 220.

[0047] This embodiment provides a hub cap fin water guide cone and an axial flow pump. The head of the water guide cone is designed to be hemispherical and has a hub cap fin, which can reduce the impact force of the water flow and hydraulic loss. The water guide hole opened on the water guide cone can change the partial flow state of the central area of ​​the inlet of the axial flow pump, so that the intensity of the blade vortex is reduced and the amplitude of the pressure pulsation is weakened, thereby reducing the probability of cavitation erosion on the blade, weakening the vacuum in the middle area of ​​the water guide cone, and increasing the pressure inside the water guide cone to obtain higher hydraulic efficiency.

[0048] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A hub cap fin water guide cone, suitable for an axial flow pump (200), characterized in that: include: The first part (110) is hemispherical; A second portion (120), wherein the hemispherical edge of the first portion (110) is extended axially to form a cylinder to serve as the second portion (120); The water guide hole (130) is opened in the second portion (120), and the water guide hole (130) is an oblique blind hole to reduce blade vortex.

2. The boss cap fin water guide cone according to claim 1, characterized in that: A plurality of rows of water guide holes (130) are provided on the cylindrical surface of the second part (120); The multiple rows of water guide holes (130) are parallel to each other; Two adjacent rows of water guide holes (130) are arranged in a staggered manner; Each row of the water guide holes (130) is evenly spaced around the circumference of the second portion (120).

3. The boss cap fin water guide cone according to claim 1 or 2, characterized in that: The oblique opening of the water guide hole (130) faces the first part (110).

4. The boss cap fin water guide cone according to claim 1 or 2, characterized in that: A plurality of boss cap fins (140) are installed on the cylindrical surface of the second portion (120); The boss cap fin (140) is close to the first portion (110); A plurality of the boss cap fins (140) are evenly spaced around the circumference of the second portion (120).

5. The boss cap fin water guide cone according to claim 4, characterized in that: Along the water flow direction, the water guide hole (130) is located downstream of the boss cap fin (140).

6. An axial flow pump, comprising at least a pump shaft (210), characterized in that: Also includes the boss cap fin water guide cone according to any one of claims 1-5; The pump shaft (210) and the water guide cone (100) are coaxially fixedly connected; A plurality of blades (220) are mounted on the pump shaft (210).

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