A vortex pump impeller

Abstract

A vortex pump impeller, the impeller includes blades, each blade tip is subjected to a shaping treatment, the blade is generally sickle-shaped, and its outer peripheral contour is surrounded by a straight blade working surface, a straight blade back, a shaping working surface blade tip and a shaping back surface blade tip, the shaping working surface blade tip and the shaping back surface blade tip are curved surfaces, the lower end of the shaping working surface blade tip is smoothly connected to the upper end of the straight blade working surface, the lower end of the shaping back surface blade tip is smoothly connected to the upper end of the straight blade back, and the upper end of the shaping working surface blade tip is connected to the upper end of the shaping back surface blade tip. The present invention provides a vortex pump impeller, which improves the flow structure at the vortex pump blade tip, improves the cavitation resistance of the impeller, reduces the tip gap leakage loss, and makes it more valuable for industrial use.

Description

Technical Field

[0001] The present invention relates to the technical field of pumps, in particular to a vortex pump impeller, belonging to the field of fluid machinery. Background Art

[0002] The vortex pump is a low specific speed vane pump. It is widely used in chemical industry, fire protection, domestic water supply, instrumentation, hydraulic transmission, aerospace and medical equipment industries due to its high head, small flow, low cost, simple and compact structure, easy processing, self-priming function and gas-liquid mixing function.

[0003] The vortex pump is mainly composed of a pump casing and an impeller. The outer edge of the impeller has multiple radial blades evenly arranged in a radial shape, with the number of blades reaching dozens. The vortex pump accelerates the fluid by exchanging momentum in the impeller and in the flow channel, that is, each reflux movement will cause the reflux to collide with the pressure flow in the flow channel, generating a large number of longitudinal vortices and radial vortices in the flow area. The large pressure difference on both sides of the blades causes undercurrents in the tip gap, resulting in volume loss, and the undercurrents will also mix with the longitudinal and radial vortices, resulting in more complex secondary flows at the tip of the blades. The reflux and secondary flows caused by this specific structure will not only greatly reduce the efficiency of the impeller, but also easily cause cavitation, causing considerable losses to the operation of the pump. Therefore, the efficiency of the vortex pump is very low, usually only 20%-40%. Summary of the invention

[0004] In order to overcome the shortcomings of existing vortex pumps, such as large tip clearance leakage loss and low impeller cavitation resistance, the present invention provides a vortex pump impeller, which improves the flow structure at the tip of the vortex pump blades, improves the impeller cavitation resistance, reduces tip clearance leakage loss, and makes it more valuable for industrial use.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A vortex pump impeller, the impeller includes blades, each blade is profiled at the top, the blade is generally sickle-shaped, and its outer peripheral contour is surrounded by a straight blade working surface, a straight blade back, a profiled working surface blade top and a profiled back surface blade top, the profiled working surface blade top and the profiled back surface blade top are curved surfaces, the lower end of the profiled working surface blade top is smoothly connected to the upper end of the straight blade working surface, the lower end of the profiled back surface blade top is smoothly connected to the upper end of the straight blade back, and the upper end of the profiled working surface blade top is connected to the upper end of the profiled back surface blade top.

[0007] Furthermore, the impeller also includes a front guide plate, and the outer edge of the front guide plate is located in the middle of the blade.

[0008] Furthermore, the intersection edge of the modified working surface blade top and the modified back surface blade top is located at a position twice as wide as the thickness of the straight blade.

[0009] Furthermore, the curvature γ1 of the modified working surface blade tip is greater than the curvature γ2 of the modified back surface blade tip.

[0010] Preferably, the curvature γ1 of the modified working surface blade tip and the curvature γ2 of the modified back surface blade tip satisfy the following formula: γ1=K1γ2, where K1 is a proportionality coefficient with a value of 1.35-1.75, and the units of γ1 and γ2 are mm -1 .

[0011] The curvature γ1 of the blade tip on the modified working surface and the curvature γ2 of the blade tip on the modified back surface increase linearly from the blade inlet to the blade outlet, and the curvature of the blade tip at the blade inlet is 1.2-1.3 times that at the outlet.

[0012] The distance between the outer edge of the front guide plate and the center line of the hub is d1, and the distance between the outer edge of the vortex pump impeller and the center line of the hub is d2, and the following formula is satisfied: d2 = K2d1, where K2 is a proportional coefficient with a value of 1.15-1.25, and the units of d1 and d2 are mm -1 .

[0013] The connection between the shaping working surface and the shaping back surface is rounded.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the vortex pump impeller blades of the present invention, after trimming treatment at the blade tip, can effectively weaken the jet wake area of ​​the vortex pump impeller, inhibit the separation of the suction surface, reduce the strength of the gap vortex, and weaken the complex flow states such as the mutual mixing of the jet wake and the cross-blade flow; and the blade tip trimming treatment forms a guiding effect on the fluid, increases the effective flow channel volume, makes the fluid flow more uniform and more stable, reduces entropy increase, increases the effectiveness of the impeller, improves the efficiency of the vortex pump, and avoids energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the vortex pump impeller according to an embodiment of the present invention;

[0016] Figure 2 This is a front view of the vortex pump impeller according to an embodiment of the present invention;

[0017] Figure 3 This is a cross-sectional view of a vortex pump impeller according to an embodiment of the present invention;

[0018] Figure 4 This is a cross-sectional view of the vortex pump impeller blades according to an embodiment of the present invention.

[0019] Among them: 1. impeller; 2. front guide plate; 3. blade; 31. straight blade working surface; 32. straight blade back; 33. modified working surface blade top; 34. modified back blade top. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Reference Figure 1 to Figure 4 A vortex pump impeller, the impeller includes blades 3, each blade tip is subjected to shaping treatment, the blade as a whole is approximately sickle-shaped, and its outer peripheral contour is surrounded by a straight blade working surface 31, a straight blade back surface 32, a shaping working surface blade tip 33 and a shaping back surface blade tip 34, the shaping working surface blade tip 33 and the shaping back surface blade tip 34 are curved surfaces, the lower end of the shaping working surface blade tip 33 is smoothly connected to the upper end of the straight blade working surface 31, the lower end of the shaping back surface blade tip 34 is smoothly connected to the upper end of the straight blade back surface 32, and the upper end of the shaping working surface blade tip 33 is connected to the upper end of the shaping back surface blade tip 34.

[0022] Furthermore, the impeller further comprises a front guide plate 2, and the outer edge of the front guide plate 2 is located in the middle of the blade.

[0023] Furthermore, the intersection edge of the modified working surface blade top 33 and the modified back surface blade top 34 is located at a position twice as wide as the thickness of the straight blade.

[0024] Furthermore, the curvature γ1 of the modified working surface blade tip 33 is greater than the curvature γ2 of the modified back surface blade tip 34 .

[0025] Preferably, the curvature γ1 of the modified working surface blade tip 33 and the curvature γ2 of the modified back surface blade tip 34 satisfy the following formula: γ1=K1γ2, where K1 is a proportionality coefficient with a value of 1.35-1.75, and the units of γ1 and γ2 are mm -1 .

[0026] The curvature γ1 of the modified working surface blade tip 33 and the curvature γ2 of the modified back surface blade tip 34 increase linearly from the blade inlet to the blade outlet, and the curvature of the blade tip at the blade inlet is 1.2-1.3 times that at the blade outlet.

[0027] The distance between the outer edge of the front guide plate 2 and the center line of the hub is d1, and the distance between the outer edge of the vortex pump impeller and the center line of the hub is d2, and the following formula is satisfied: d2 = K2d1, where K2 is a proportionality coefficient with a value of 1.15-1.25, and the units of d1 and d2 are mm -1 .

[0028] The connection between the shaping working surface and the shaping back surface is rounded.

[0029] The vortex pump impeller blades 1 of this embodiment are subjected to a profile modification treatment at the blade tips of the closed impeller straight blades, and the impeller 1 includes dozens of blades 3.

[0030] The parameters γ1, γ2, d1, d2, K1, and K2 determined by all the above formulas are optimized to ensure that the modified blades can more effectively increase the flow channel volume, suppress gap leakage vortices, and improve fluid flow stability and efficiency.

[0031] The vortex pump impeller blade modification of the present invention can effectively blur the jet wake area of ​​the vortex pump impeller 1, inhibit the shedding of the suction surface, reduce the formation of gap vortices, and weaken the complex flow states such as the mutual mixing of jet wakes and the cross-blade flow; and the blade tip modification treatment forms a guiding effect on the fluid, greatly reducing the operating noise of the pump; increasing the effective flow channel volume, making the fluid flow more uniform and more stable, reducing entropy increase, increasing the effectiveness of the impeller 1, improving the efficiency of the vortex pump, and avoiding energy waste.

[0032] Those skilled in the art can understand that the above are only preferred examples of the invention and are not intended to limit the invention. Although the invention is described in detail with reference to the above examples, those skilled in the art can still modify the technical solutions recorded in the above examples or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, etc. made within the spirit and principle of the invention shall be included in the protection scope of the invention.

Claims

1. A vortex pump impeller, the impeller comprising blades, characterized in that: The top of each blade is subjected to shaping treatment, and the blade is approximately sickle-shaped as a whole, and its outer peripheral contour is surrounded by a straight blade working surface, a straight blade back surface, a shaping working surface blade top and a shaping back surface blade top, the shaping working surface blade top and the shaping back surface blade top are curved surfaces, the lower end of the shaping working surface blade top is smoothly connected to the upper end of the straight blade working surface, the lower end of the shaping back surface blade top is smoothly connected to the upper end of the straight blade back surface, the upper end of the shaping working surface blade top is connected to the upper end of the shaping back surface blade top, and the blade top is curved toward the back side of the blade; The impeller further comprises a front guide plate, the outer edge of which is located in the middle of the blade, the intersection of the modified working surface blade top and the modified back blade top is located at a position twice as wide as the thickness of the straight blade, and the curvature of the modified working surface blade top is The curvature of the blade tip on the back side of the modified blade The curvature of the blade tip of the modified working surface is large. and the curvature of the back blade tip of the modified back Satisfies the following formula: ,in K 1 is the proportionality coefficient, the value is 1.35-1.75, and The unit is ; The outer edge of the front deflector is 1 / 2 of the center line of the wheel hub. d 1. The distance between the outer edge of the vortex pump impeller and the center line of the hub is d 2, and satisfy the following formula: ,in K 2 is the proportionality coefficient, the value is 1.15-1.25, d 1 and d The unit of 2 is mm.

2. A vortex pump impeller according to claim 1, characterized in that: The connection between the shaping working surface and the shaping back surface is rounded.

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