Axial flow pump and guide vane structure of impeller of axial flow pump

Abstract

An axial flow pump and a guide vane structure of an impeller thereof. A plurality of guide vanes (2) are provided and distributed on the periphery of an impeller shaft (1) at intervals. In the process of the impeller shaft (1) driving the guide vanes (2) to rotate, the guide vanes (2) support a liquid by means of flow guide surfaces so as to pump the liquid in a spiral rise direction. A first guide vane (21) has a first projection, and a second guide vane (22) has a second projection, the projection tail end (210) of the first projection and the projection initial end (220) of the second projection overlapping each other, and the first projection covering the second projection.

Description

Axial flow pump and guide vane structure of axial flow pump impeller Technical Field

[0001] The present application relates to the technical field of axial flow pumps, and more specifically, to an axial flow pump and a guide vane structure of an axial flow pump impeller. Background Art

[0002] Axial flow pumps rely on the rotating impeller to drive the blades to generate an axial force on the liquid, causing the liquid to be transported along the impeller axis. The impeller is equipped with fixed guide vanes. As the impeller rotates, the blades drive the liquid flow. The kinetic energy of the impeller's rotation is converted into pressure energy on the liquid, causing the liquid to be lifted and pumped.

[0003] The impeller is driven by the impeller shaft to pump water. In an axial flow pump, the motor drives the impeller shaft to rotate, and the impeller shaft drives the impeller to rotate to pump liquid. When the impeller is driven by the impeller shaft to pump water, the impeller's pumping capacity is controlled by the driving force of the motor, as well as the water pressure and pumping resistance. The smoothness of the pumping between the impeller and the liquid along the pumping direction will have a significant impact on the axial flow pump's pumping capacity.

[0004] It should be pointed out here that the technical content provided in this section is intended to help those skilled in the art understand the present application, and does not necessarily constitute prior art.

[0005] Application Contents

[0006] In view of this, the purpose of this application is to provide a guide vane structure of an axial flow pump impeller to improve the transmission working capacity of the impeller in the axial flow pump; the present invention also provides an axial flow pump.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A guide vane structure for an axial flow pump impeller, wherein the impeller comprises an impeller column extending in the direction of pumping liquid, and a plurality of guide vanes spaced and distributed around the outer periphery of the impeller column, wherein the guide vanes spirally rise along the axial direction of the impeller column;

[0009] The guide vane has a first guide vane and a second adjacent guide vane, the first guide vane has a first projection along the axial direction of the impeller column, the second guide vane has a second projection along the axial direction of the impeller column, and the projection end of the first projection overlaps and covers the projection start end of the second projection.

[0010] Preferably, in the guide vane structure of the axial flow pump impeller, the first boundary line of the projection end is an arc boundary line offset toward the second guide vane side.

[0011] Preferably, in the guide vane structure of the axial flow pump impeller, the second boundary line of the projection start end is a straight boundary line extending radially along the impeller column.

[0012] Preferably, in the guide vane structure of the axial flow pump impeller, the end of the arc boundary line and the end of the straight boundary line form an overlapping angle centered on the impeller column.

[0013] Preferably, in the guide vane structure of the axial flow pump impeller, the straight boundary line and the arc boundary line overlap near the root side of the impeller column.

[0014] Preferably, in the guide vane structure of the above-mentioned axial flow pump impeller, the overlap angle is 5-30 degrees.

[0015] Preferably, in the guide vane structure of the axial flow pump impeller, a guide channel is formed between the first guide vane and the second guide vane, and the channel width of the guide channel is substantially equal along the extension direction of the first guide vane and the second guide vane.

[0016] Preferably, in the guide vane structure of the axial flow pump impeller, the impeller column includes an impeller column body and a guide seat provided on the liquid inlet side of the impeller column body, and a pump shaft through hole is coaxially arranged in the impeller column body and the guide seat;

[0017] The outer end surface of the guide seat connected to the impeller column body is an arcuate guide surface, and the arcuate guide surface has a tapered guide structure in a direction away from the impeller column body.

[0018] Preferably, in the guide vane structure of the above-mentioned axial flow pump impeller, the guide vane includes three vanes evenly distributed on the outer periphery of the impeller column, and the angles between the three guide vanes at the same axial height of the impeller column are the same.

[0019] An axial flow pump comprises a pump body and an impeller arranged in the pump body, wherein the impeller has the guide vane structure of the axial flow pump impeller as described in any one of the above items.

[0020] The present invention provides a guide vane structure for an axial flow pump impeller. The impeller comprises an impeller column extending in the direction of pumping liquid, and a plurality of guide vanes spaced apart on the outer periphery of the impeller column. The guide vanes spirally ascend along the axial direction of the impeller column. The guide vanes comprise adjacent first and second guide vanes. The first guide vane has a first projection along the axial direction of the impeller column, and the second guide vane has a second projection along the axial direction of the impeller column. The end of the first projection overlaps and covers the beginning of the second projection. The impeller rotates, driving the guide vanes to pump water. The guide vanes are provided in plurality and spaced apart on the outer periphery of the impeller column. When the impeller column drives the guide vanes to rotate, the guide vanes, through their guide surfaces, carry the liquid along the spiral ascending direction to pump the liquid. Between the adjacent first guide vanes and the second guide vanes, the first guide vanes and the second guide vanes are projected from the liquid outlet end to the liquid inlet end of the impeller, the first guide vane has a first projection, and the second guide vane has a second projection, the projection end of the first projection and the projection start end of the second projection overlap with each other, and the first projection cover is arranged on the second projection, when the liquid is lifted by the guide channel between the first guide vane and the second guide vane, when the liquid is lifted by the second guide vane, the upper guide surface of the first guide vane and the lower guide surface of the second guide vane constrain the liquid, so that the liquid is spirally lifted by the guide channel, and after the liquid is squeezed and lifted in the guide channel, it is discharged from the liquid outlet end of the impeller, the liquid obtains a longer acceleration time, the initial kinetic energy of the pumped liquid is increased, the pumping capacity of the impeller is increased, and the performance of the axial flow pump is thereby improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features and advantages of the present application will become more apparent through the following description of the embodiments of the present application with reference to the accompanying drawings, in which:

[0022] FIG1 is a front view of the guide vane structure of the axial flow pump impeller provided by the present invention;

[0023] FIG2 is a schematic diagram of the axial projection structure of the guide vane structure of the axial flow pump impeller in FIG1 . DETAILED DESCRIPTION

[0024] The present application will be described below based on examples, but the present application is not limited to these examples.

[0025] Figure 1

[0026] - As shown in Figure 2, Figure 1 is a front view of the guide vane structure of the axial flow pump impeller provided by the present invention; Figure 2 is a schematic diagram of the axial projection structure of the guide vane structure of the axial flow pump impeller in Figure 1.

[0027] This embodiment provides a guide vane structure of an axial flow pump impeller, wherein the impeller has an impeller column 1 extending along the pumping direction, and a plurality of guide vanes 2 spaced apart on the outer periphery of the impeller column, wherein the guide vanes rise in a spiral along the axial direction of the impeller column 1; the guide vanes 2 have adjacent first guide vanes 21 and second guide vanes 22, wherein the first guide vane 21 has a first projection along the axial direction of the impeller column 1, and the second guide vane 22 has a second projection along the axial direction of the impeller column, and the projection end 210 of the first projection overlaps with the projection start 220 of the second projection.

[0028] The rotation of the impeller drives the guide vanes 2 to pump water. A plurality of guide vanes 2 are provided and spaced apart on the outer periphery of the impeller column. When the impeller column drives the guide vanes to rotate, the guide vanes 2 carry the liquid along the spiral ascending direction by their guide surfaces to pump the liquid.

[0029] Between adjacent first guide vanes 21 and second guide vanes 22, project the first guide vanes 21 and the second guide vanes 22 from the impeller's liquid outlet end 101 toward the liquid inlet end 102. The first guide vane 21 obtains a first projection, and the second guide vane 22 obtains a second projection. The end of the first projection overlaps the beginning of the second projection, and the first projection is placed over the second projection. The overlapping relationship between the first and second projections exists between any two adjacent guide vanes of the impeller 1. This embodiment uses any two adjacent guide vanes as an example for illustration, and any two adjacent guide vanes have this overlapping relationship.

[0030] The liquid flows through the guide channel between the first guide vane 21 and the second guide vane 22, and the impeller rotates to lift the liquid. Specifically, when the axial flow pump is working, the impeller 1 rotates at high speed, and the first guide vane 21 and the second guide vane 22 are both pumped into the liquid from the starting end of the spiral structure. Taking the liquid between the first guide vane 21 and the second guide vane 22 as an example, the second guide vane 22 rotates with the impeller 1, and the second guide vane 22 carries the liquid to its upper guide surface 221 at the projected starting end 220. As the liquid is continuously fed in, the liquid is gradually rotated and lifted on the upper guide surface 221. Since the projected end 210 of the first guide vane 21 and the projected starting end 220 of the second guide vane 22 overlap, the liquid lifted by the upper guide surface 221 at the projected starting end 220 Blocked by the lower guide surface 211 of the first guide vane 21, the liquid is lifted in the guide channel constrained by the upper guide surface 221 and the lower guide surface 211. Since the rotation of the impeller 1 is a liquid acceleration process, the lower guide surface 211 of the first guide vane 21 and the upper guide surface 221 of the second guide vane 22 constrain the liquid, so that the liquid is spirally lifted by the guide channel. After the liquid is squeezed and lifted in the guide channel, it is discharged from the liquid outlet end 102 of the impeller 1. The liquid obtains a longer acceleration time, thereby increasing the initial kinetic energy of the pumped liquid, improving the pumping capacity of the impeller, and thereby improving the performance of the axial flow pump.

[0031] In a specific embodiment of the present case, the first boundary line of the projection end 210 is an arc boundary line offset toward the second guide vane 22. The second boundary line of the projection start 220 is a straight boundary line extending along the radial direction of the impeller column 1.

[0032] The impeller column 1 provided in this application is a cylindrical impeller column. An impeller chamber is provided within the axial flow pump. In a preferred configuration, the impeller chamber is cylindrical, and a clearance for impeller rotation exists between the outer ring of the guide vane 2 and the inner wall of the impeller chamber. The arc boundary line and straight boundary line indicated in this embodiment indicate the starting and ending points of the guide vane 2 extending in the spiral ascending direction.

[0033] When the liquid is pumped, the beginning of the guide vane 2 first contacts the liquid, and the liquid flows through the guide channel between the first guide vane 21 and the second guide vane 22 and is pumped out from the end of the second guide vane 22. The end of the second guide vane 22 forms a projection that overlaps with the next adjacent guide vane.

[0034] As the impeller rotates, the liquid is simultaneously subjected to centrifugal force during the lift process, resulting in a flow velocity difference between the inner side of the guide vane 2 near the impeller column 1 and the outer side away from the impeller column. In this application, the first boundary line of the projected end 210 is set as an arc boundary line, and the arc direction of the arc boundary line is offset from the first guide vane 21 to the second guide vane 22. That is, at the projected end 210, the projected area of ​​the first guide vane 21 gradually increases from the inner side of the guide vane 2 to the outer side. As a result, the lower guide surface 211 of the first guide vane 21 forms a larger area constraint on the second guide vane 22 on the outer side of the guide vane 2.

[0035] The projection start end 220 of the second guide vane 22 has a second boundary line. The upper guide surface 221 of the second guide vane 22 carries the liquid. The second boundary line is set as a straight line. When the liquid enters the upper guide surface 221 , the liquid is carried.

[0036] In this embodiment, the second boundary line 220 can also be set to be offset toward the first guide vane 21, thereby increasing the projected area of ​​the projected end 210 of the first guide vane 21 covering the projected start 220 of the second guide vane 22, thereby obtaining a longer conveying time.

[0037] In this embodiment, in order to avoid the second boundary line 220 from deviating toward the first guide vane 21, resulting in a reduction in the opening area of ​​the guide channel between the first guide vane 21 and the second guide vane 22, it is preferred to set the second boundary line as a straight boundary line, so that the guide channel of the first guide vane 21 and the second guide vane 22 obtains the maximum guide channel inlet area, thereby ensuring the liquid inlet amount of the impeller.

[0038] In this embodiment, the end of the arc boundary line and the end of the straight boundary line form an overlap angle α centered on the impeller column. The straight boundary line and the arc boundary line overlap near the root side of the impeller column 1.

[0039] Preferably, the overlap angle α is 5-30 degrees. Furthermore, the overlap angle α can be further adjusted based on the operating conditions of the axial flow pump, such as being set to 10°, 15°, or 25°, so that different guide lengths are obtained between the two guide vanes, thereby balancing the liquid inlet and outlet speeds and pumping energy.

[0040] In this embodiment, the guide vanes 2 include three vanes evenly distributed on the outer periphery of the impeller column 1 , and the included angles between the three guide vanes at the same axial height of the impeller column 1 are the same.

[0041] This embodiment preferably employs a cylindrical impeller column 1, with three guide vanes disposed on the outer periphery of the impeller column 1. The included angles between the three guide vanes at the same axial height of the impeller column are identical, specifically 120°. It will be appreciated that the three guide vanes 2 are arranged identically on the outer periphery of the impeller column 1, and thus, at the same axial height and radial position, all three guide vanes have an included angle of 120°.

[0042] In a preferred structure, the second boundary line is set as a straight boundary line, so that the maximum guide channel inlet area is obtained between the first guide vane 21 and the second guide vane 22. At the same time, since the end of the first guide vane 21 is an arc boundary line, the guide channel outlet area will be reduced. By controlling the curvature of the arc boundary line, the straight boundary line and the arc boundary line are overlapped in the projection direction, near the root side of the impeller column, and the first guide vane constrains the liquid flow on the outside of the projection end, thereby increasing the liquid flow distance while reducing the impact of the reduction in the guide channel outlet area.

[0043] The overlap angle α is described in detail below. The end of the arc boundary line connects the center of the impeller column to form a first line 2100, and the end of the straight boundary line connects the center of the impeller column 1 to form a second line 2200. The first line 2100 and the second line 2200 form an offset angle α in the projection direction. This offset angle α is the overlap angle between the first guide vane 21 and the second guide vane 22. The overlap angle α is preferably set to 15-25 degrees. This extends the length of the guide channel, obtaining a longer liquid acceleration distance, while also avoiding affecting the outlet area of ​​the guide channel, thereby maximizing the pumping kinetic energy.

[0044] In this embodiment, a guide channel is formed between the first guide vane 21 and the second guide vane 22 , and the channel width of the guide channel is substantially equal along the extending direction of the first guide vane 21 and the second guide vane 22 .

[0045] In a specific embodiment of the present case, the impeller column 1 includes an impeller column body and a guide seat 14 provided on the liquid inlet side of the impeller column body. A pump shaft through hole is coaxially arranged in the impeller column body and the guide seat 14 .

[0046] The outer end surface of the guide seat 14 connected to the impeller column body is an arcuate guide surface, and the arcuate guide surface has a gradually contracting guide structure in the direction away from the impeller column body.

[0047] The impeller rotates to pump the liquid, and the liquid enters between the impellers from the liquid inlet end 101. Since the flow of liquid between the guide vanes 2 of the impeller is an accelerated process, in order to increase the amount of liquid replenished into the impeller and avoid the flow difference between the impeller liquid inlet end 101 and the liquid outlet end 102, resulting in insufficient liquid supply at the liquid inlet end 101 and causing cavitation and other problems, an arc-shaped guide seat is provided at the front end of the impeller column 1, and a spherical guide seat structure is preferably adopted. The guide seat 14 is coaxially arranged with the impeller column body, and a pump shaft through hole is arranged inside. The pump shaft synchronously drives the guide seat and the impeller column body to rotate, thereby improving the structural strength of the impeller, and guiding the incoming liquid to ensure the stability of the pump liquid.

[0048] Based on the guide vane structure of the axial flow pump impeller provided in the above embodiment, the present invention also provides an axial flow pump, including a pump body and an impeller arranged in the pump body, and the impeller provided on the axial flow pump has the guide vane structure of the axial flow pump impeller provided in the above embodiment.

[0049] Since the axial flow pump adopts the guide vane structure of the axial flow pump impeller of the above embodiment, the beneficial effects brought about by the guide vane structure of the axial flow pump impeller of the axial flow pump can be referred to the above embodiment.

[0050] The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application. Persons skilled in the art will readily appreciate that the present application is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A guide vane structure of an axial flow pump impeller, characterized in that: The impeller has an impeller column extending in the direction of pumping liquid, and a plurality of guide vanes spaced and distributed on the outer periphery of the impeller column, wherein the guide vanes rise in a spiral along the axial direction of the impeller column; The guide vane has a first guide vane and a second guide vane adjacent to each other, the first guide vane has a first projection along the axial direction of the impeller column, the second guide vane has a second projection along the axial direction of the impeller column, and the projection end of the first projection overlaps and covers the projection start end of the second projection.

2. The guide vane structure of the axial flow pump impeller according to claim 1, characterized in that: The first boundary line of the projection end is an arc boundary line offset toward the second guide vane side.

3. The guide vane structure of the axial flow pump impeller according to claim 2, characterized in that: The second boundary line of the projection start end is a straight boundary line extending along the radial direction of the impeller column.

4. The guide vane structure of the axial flow pump impeller according to claim 3, characterized in that: The end of the arc boundary line and the end of the straight boundary line form an overlapping angle centered on the impeller column.

5. The guide vane structure of the axial flow pump impeller according to claim 4, characterized in that: The straight boundary line and the arc boundary line overlap at a root side close to the impeller column.

6. The guide vane structure of the axial flow pump impeller according to any one of claims 4 or 5, characterized in that: The overlapping angle is 5-30 degrees.

7. The guide vane structure of the axial flow pump impeller according to claim 6, characterized in that: A guide channel is formed between the first guide vane and the second guide vane, and the channel width of the guide channel is substantially equal along the extension direction of the first guide vane and the second guide vane.

8. The guide vane structure of the axial flow pump impeller according to claim 7, characterized in that: The impeller column comprises an impeller column body and a guide seat arranged on the liquid inlet side of the impeller column body, and a pump shaft through hole is coaxially arranged in the impeller column body and the guide seat; The outer end surface of the guide seat connected to the impeller column body is an arcuate guide surface, and the arcuate guide surface has a tapered guide structure in a direction away from the impeller column body.

9. The guide vane structure of the axial flow pump impeller according to claim 1, characterized in that: The guide vanes include three vanes evenly distributed on the outer periphery of the impeller column, and the included angles between the three guide vanes at the same axial height of the impeller column are the same.

10. An axial flow pump, comprising a pump body and an impeller arranged in the pump body, characterized in that: The impeller has the guide vane structure of the axial flow pump impeller as claimed in any one of claims 1 to 9.

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