An open vortex pump impeller structure with high and low oblique folded blades and an open vortex pump

Abstract

The present invention discloses an open vortex pump impeller structure with high and low oblique folded blades and an open vortex pump. The impeller adopts a semi-open impeller structure. The impeller includes a rear cover plate, a plurality of long blades and short blades arranged on one side of the rear cover plate, and a back blade arranged on the other side of the rear cover plate. The plurality of long blades and short blades are alternately arranged and evenly distributed in the circumferential direction of the rear cover plate. The long blade includes a first long blade segment and a second long blade segment, and the first long blade segment and the second long blade segment have a connection point A; the short blade includes a first short blade segment and a second short blade segment, and the first short blade segment and the second short blade segment have a connection point B. The distance S between the connection point A and the connection point B and the center of the rear cover plate is equal; the inlet diameter of the long blade is smaller than the inlet diameter of the short blade; and the width of the long blade is smaller than the width of the short blade. The present invention effectively increases the impeller flow passage area, improves the flow state in the pump, reduces flow passage congestion, and increases the passing capacity of entangled solids through the design of high and low oblique folded blades on the impeller.

Description

Technical Field

[0001] The invention relates to the technical field of open vortex pumps, in particular to an open vortex pump impeller structure with high and low oblique folded blades and an open vortex pump. Background Art

[0002] A vortex pump is named for its unique internal vortex motion. The impeller, driven by the pump shaft, rotates in the pump's rear chamber. Directly or indirectly, the impeller acts on the fluid, causing it to circulate in intense axial and radial vortexes within the pump chamber. The lower pressure within the vortex allows for a continuous flow of fluid. This circulatory vortex motion causes pressure and circumferential velocity to increase radially, forming a circular flow with a certain amount of energy at the periphery, which ultimately exits the pump chamber as a throughflow. Swirl pumps are mostly used to pump complex solid-liquid two-phase flow media containing large particles and long fibers. Their impellers are retracted into the chamber of the volute or behind the pump chamber. There is a wider flow channel between the semi-open impeller and the pump casing. When transporting two-phase fluids containing large particles or irregular soft fiber solid media, swirl pumps have the characteristics of not clogging or damaging the solid media. They are often widely used in the dredging of rivers and ports in the urban environmental protection industry, domestic sewage treatment, sludge transportation in marine engineering, pulp in light industry, transportation of grain and potatoes in agricultural and sideline product production, and transportation of ore and coal slag in the mining and metallurgical industries.

[0003] Although vortex pumps are widely used due to their good anti-clogging performance, in some harsh environments or emergency treatment situations, the medium contains large solid particles and long fibers, which can still cause semi-blockage of the flow channel, resulting in shutdown and maintenance, affecting emergency pumping efficiency.

[0004] After searching, the disclosed invention patent "A semi-open vortex pump with wide and narrow blades and an annular front cover" (application number: CN201811029712.0) has straight blades, and the impeller is retracted in the rear cavity of the volute chamber. It has low efficiency and a small flow area, and its operation is relatively unstable. It is prone to vibration during operation and requires frequent shutdowns for maintenance. The disclosed patent "A design method for a non-clogging vortex pump impeller with long and short folded blades" (application number: CN201410481963.8) discloses a vortex pump impeller with cylindrical blades. Its ability to pass solid media is insufficient, making it difficult to cope with some harsh environments. In addition, it adds folds of different lengths to cylindrical blades of different lengths. On the one hand, this increases the manufacturing cost. On the other hand, when conveying solid-liquid mixtures, the probability of collision between solid particles and the folded edges of the blades increases, resulting in increased wear on the blades and a shortened service life. The authorized patent "A hydraulic design method for a swirl pump using long and short blades" (application number: CN201310744514.3) also discloses a technology that uses cylindrical blades, which have insufficient capacity to pass solid media and are difficult to cope with in some harsh environments. Summary of the Invention

[0005] To address the inadequate solid media throughput capacity of existing vortex pumps, making them difficult to handle in harsh environments, the present invention provides an open vortex pump impeller structure and open vortex pump with high-low skewed blades. The design of the high-low skewed blades on the impeller effectively increases the impeller flow passage area, improves flow conditions within the pump, reduces congestion, and increases the ability to pass entangled solids. This invention offers a simple structure, stable operation, high efficiency, and significant energy savings.

[0006] The technical solution adopted by the present invention is:

[0007] An open swirl pump impeller structure with high and low oblique blades is characterized in that: the impeller adopts a semi-open impeller structure, the impeller includes a rear cover plate, a plurality of long blades and short blades arranged on one side of the rear cover plate, a back blade arranged on the other side of the rear cover plate and evenly arranged around the circumference, and a hub located in the center of the rear cover plate, the plurality of long blades and short blades are arranged alternately and evenly distributed in the circumferential direction of the rear cover plate, the long blade includes a first long blade segment and a second long blade segment connected, the first long blade segment rotates around the end point O of the inlet end of the first long blade segment and forms an angle of θ with the diameter of the rear cover plate passing through the end point O, the second long blade segment rotates around the connection point A of the first long blade segment and the second long blade segment and forms an angle of The short blade includes a first short blade segment and a second short blade segment connected to each other. The connection point between the first short blade segment and the second short blade segment is B. The distances S between the connection points A and B and the center of the circle of the rear cover are equal. The angle between the second short blade segment and the radius passing through the connection point B is equal to the angle between the second long blade segment and the radius passing through the connection point A. The angle formed between the second short blade segment and the extension line of the first short blade segment is the second long blade segment and the second short blade segment extend to the edge of the rear cover, the inlet diameter D1 of the long blade is smaller than the inlet diameter D1' of the short blade; the long blade width b2 is smaller than the short blade width b2'.

[0008] The inlet diameter D1 of the long blade is

[0009]

[0010] Where coefficient K1 = 1.95 ~ 2.35; D1 is the inlet diameter of the long blade, in m; Q is the flow rate, in m 3 / s; n is the impeller speed, unit is r / min;

[0011] The short blade inlet diameter D1′ is

[0012] D1′=D1+(1-k1′)(2S-D1) (2)

[0013] Where, k1′=0.45~0.65; D1 is the inlet diameter of the long blade, in meters;

[0014] The outer diameter D2 of the long blade is

[0015]

[0016] Wherein the coefficient K2 = 21.5 ~ 23.5; D2 is the outer diameter of the long blade, in m; g is the acceleration due to gravity, in m / s 2 ; H is the lift, unit is m; n is the impeller speed, unit is r / min;

[0017] The outer diameter D2′ of the short blade is

[0018] D2′=D2 (4)

[0019] The long blade width b2 is

[0020] b2=(0.16~0.19)D2 (5)

[0021] The short blade width b2′ is

[0022] b2′=(1.2~1.5) b2 (6)

[0023] The distance S between the connection point A of the first long leaf segment and the second long leaf segment and the center of the rear cover is

[0024] S=1 / 2[D1+(1-k)(D2-D1)] (7)

[0025] Wherein k = 0.25~0.35; D1 is the inlet diameter of the long blade, in m; D2 is the outer diameter of the long blade, in m.

[0026] Furthermore, the total number of the long blades and the short blades is 8 to 12 and is an even number, and the number of the long blades and the short blades is equal.

[0027] Furthermore, an angle θ formed by the first long blade segment and the diameter of the rear cover plate through the end point O is θ=10° to 70°, and its inclination direction is the same as or opposite to the impeller rotation direction.

[0028] Furthermore, the angle formed by the extension line of the second long blade segment and the first long blade segment is for Its inclination direction is the same as or opposite to the impeller rotation direction.

[0029] Furthermore, the number of the back blades is 6 to 10; the thickness of the back blades is equal to that of the long blades.

[0030] Furthermore, the thickness of the short blade is greater than the thickness of the long blade.

[0031] Furthermore, the thickness of the short blade is 1 mm greater than that of the long blade.

[0032] An open vortex pump is characterized by comprising an open vortex pump impeller with high and low oblique folded blades, wherein the impeller is installed on the rear side of the pump cavity.

[0033] Furthermore, a gap of 1 to 2 mm is provided between the back blade and the pump housing.

[0034] The beneficial effects of the present invention are:

[0035] The impeller of the present invention adopts high and low oblique blades, and the blades can better limit the vortex, which can improve the flow state in the pump and reduce the loss of circulating vortex in the bladeless cavity. The flow area of ​​the flow channel between the impeller blades is increased, reducing the blockage of the flow channel; the through flow between the blade flow channels can pass larger solid particles and long fiber materials, improving the passing performance and good anti-clogging performance. The impeller rear cover is designed with evenly distributed back blades, which effectively balances the axial force on the impeller, reduces component wear, improves the reliability and stability of the vortex pump operation, extends the service life, and reduces the frequency of shutdowns and maintenance. In addition, the impeller of the present invention has a simple structure, convenient parameter calculation, and is easy to produce, install and maintain, and has a high engineering application value.

[0036] When the impeller of the present invention is installed in an open vortex pump, compared with a traditional non-clogging pump, the impeller retreats to the rear side of the pump chamber and does not completely retract into the rear chamber. It can effectively control the fluid in the pump chamber, thereby facilitating the transportation of the mixed fluid and ensuring smooth and reliable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a front perspective schematic diagram of the impeller structure of the present invention.

[0038] Figure 2 It is a back perspective schematic diagram of the impeller structure of the present invention.

[0039] Figure 3 It is the front view of the impeller structure of the present invention.

[0040] Figure 4 It is a side sectional view of the impeller structure of the present invention.

[0041] Figure 5 Schematic diagram of a single flow channel of the impeller structure of the present invention.

[0042] Figure 6 This is a schematic diagram of the installation position of the impeller on the vortex pump of the present invention.

[0043] In the figure, 1. long blade, 11. first long blade segment, 12. second long blade segment, 2. short blade, 21. first short blade segment, 22. second short blade segment, 3. rear cover, 4. back blade, 5. hub, 6. pump casing. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below with reference to the specific embodiments of the drawings, but the protection scope of the present invention is not limited thereto.

[0045] like Figure 1-2 As shown, the open swirl pump impeller with high and low oblique blades of the present invention adopts a semi-open impeller structure, which is beneficial for solid particles and fibrous materials to pass through the impeller flow channel and then flow out of the pump chamber with the help of through-flow. The impeller includes a rear cover plate 3, a plurality of long blades 1 and short blades 2 arranged on one side of the rear cover plate 3, a back blade 4 arranged on the other side of the rear cover plate 3 and evenly arranged around the circumference, and a hub 5 located at the center of the rear cover plate 3. The plurality of long blades 1 and short blades 2 are alternately arranged and evenly distributed in the circumferential direction of the rear cover plate 3. The total number of long blades 1 and short blades 2 is 8 to 12 and is an even number, and the number of long blades 1 and short blades 2 is equal. Combined Figure 3-5As shown, the long blade 1 includes a first long blade segment 11 and a second long blade segment 12 connected to each other. The first long blade segment 11 rotates around the endpoint O of the inlet end of the first long blade segment 11 and forms an angle of θ with the diameter of the rear cover 3 passing through the endpoint O. The angle θ is θ=10°~70°, and its inclination direction is the same as or opposite to the direction of rotation of the impeller. The inlet end of the first long blade segment 11 is the end of the first long blade segment 11 close to the center of the rear cover 3. The second long blade segment 12 rotates around the connection point A of the first long blade segment 11 and the second long blade segment 12 and forms an angle of The angle for Its inclination direction is the same as or opposite to the direction of rotation of the impeller. The short blade 2 includes a first short blade segment 21 and a second short blade segment 22 connected to each other. The connection point of the first short blade segment 21 and the second short blade segment 22 is B. The distances S between the connection points A and B and the center of the circle of the rear cover 3 are equal. The angle between the second short blade segment 22 and the radius passing through the connection point B is equal to the angle between the second long blade segment 12 and the radius passing through the connection point A; and the angle formed between the second short blade segment 22 and the extension line of the first short blade segment 21 is The angle between the long blade 1 and the short blade 2 is consistent in shape, and the blades adopt a high-low skewed blade structure, with a total of 8 to 12 blades. This increases the bladeless cavity between the blade and the housing, and the flow area of ​​the blade channel is increased, improving the flow of solid media. The second long blade segment 12 and the second short blade segment 22 both extend to the edge of the rear cover plate 3. The inlet diameter D1 of the long blade 1 is smaller than the inlet diameter D1' of the short blade 2. The width b2 of the long blade 1 is smaller than the width b2' of the short blade 2. This achieves a high-low skewed blade structure, which better restricts vortex flow, improves flow conditions within the pump, and reduces vortex losses in the bladeless cavity. The short blade 2 is thicker than the long blade 1, specifically 1 mm thicker than the long blade 1. The wider short blade 2 is subject to greater hydraulic impact than the long blade 1. Appropriate thickness is added to resist this greater hydraulic impact and extend its service life. Furthermore, the use of long blades 1 and short blades 2, along with appropriate thicknesses, also increases the flow channel width and flow area, improving the flow of solid media. Several back blades 4 are evenly spaced around the circumference of the other side of the rear cover 3. There are 6 to 10 back blades 4, and their thickness is equal to that of the long blades 1. These back blades 4 balance the axial forces acting on the impeller. A hub 5 is located at the center of the rear cover 3 and is connected to the motor's rotating shaft. The impeller is made of wear-resistant material, reducing maintenance and extending its service life.

[0046] The structural parameters of the impeller specifically include the following parameters: the inlet diameter D1 of the long blade 1 is

[0047]

[0048] Where coefficient K1 = 1.95 ~ 2.35; D1 is the inlet diameter of the long blade 1, in m; Q is the flow rate, in m 3 / s; n is the impeller speed, unit is r / min;

[0049] The inlet diameter D1′ of the short blade 2 is

[0050] D1′=D1+(1-k1′)(2S-D1) (2)

[0051] Where, k1′=0.45~0.65; D1 is the inlet diameter of the long blade 1, in m;

[0052] The outer diameter D2 of the long blade 1 is

[0053]

[0054] Wherein the coefficient K2 = 21.5 ~ 23.5; D2 is the outer diameter of the long blade 1, in m; g is the acceleration due to gravity, in m / s 2 ; H is the lift, unit is m; n is the impeller speed, unit is r / min;

[0055] The outer diameter D2′ of the short blade 2 is

[0056] D2′=D2 (4)

[0057] The width b2 of the long blade 1 is

[0058] b2=(0.16~0.19)D2 (5)

[0059] The width b2′ of the short blade 2 is

[0060] b2′=(1.2~1.5) b2 (6)

[0061] The distance S between the connection point A of the first long blade segment 11 and the second long blade segment 12 and the center of the rear cover plate 3 is

[0062] S=1 / 2[D1+(1-k)(D2-D1)] (7)

[0063] Wherein, k=0.25~0.35; D1 is the inlet diameter of the long blade 1, in m; D2 is the outer diameter of the long blade 1, in m.

[0064] Through the above impeller structure calculation method, we can obtain the main geometric parameters of the impeller, including the inlet diameter D1 of the long blade 1, the inlet diameter D1′ of the short blade 2, the outer diameter D2 of the long blade 1, the outer diameter D2′ of the short blade 2, the width b2 of the long blade 1, the width b2′ of the short blade 2, the distance S between the connection point A, the connection point B and the center of the back cover 3, and the selection of the appropriate number of blades and back blades and their distribution. The impeller structure is simple, the parameter calculation is convenient, and it is easy to produce, install and maintain.

[0065] An open vortex pump, comprising the open vortex pump impeller with high and low oblique folded blades, combined with Figure 6 As shown, the impeller is installed on the rear side of the pump chamber, and a gap of 1 to 2 mm is provided between the back blade 4 and the pump housing 6 .

[0066] The impeller is connected to the rotating shaft of the motor. The impeller is installed on the rear side of the pump chamber without retreating into the rear chamber. The rotation of the motor drives the impeller to rotate. The rotation of the impeller drives the fluid in the pump chamber to generate strong vortex, generating circulating flow and through-flow in the pump chamber, which can transport the mixed fluid of solid particles and fiber media in the pump.

[0067] The present invention can transport media containing particles (such as wood, gravel, granular metal, beans, grain, potatoes, etc.) and fibers (nylon rope, glass fiber, pulp, etc.), as well as oil, water, and gas mixtures. It has significant advantages when handling larger solid particles and slender fibers. Due to its wide flow path and flow area, and the large bladeless cavity between the blades and the pump casing, it has better flowability than conventional swirl pumps. The present invention has a simple structure, excellent flowability and anti-entanglement properties, and operates smoothly and reliably, reducing maintenance frequency and extending service life.

[0068] The examples are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essence of the present invention are within the scope of protection of the present invention.

Claims

1. An open swirl pump impeller structure with high and low oblique folded blades, characterized by: The impeller adopts a semi-open impeller structure, the impeller includes a rear cover plate (3), a plurality of long blades (1) and short blades (2) arranged on one side of the rear cover plate (3), a back blade (4) arranged on the other side of the rear cover plate (3) and evenly arranged around the circumference, and a hub (5) located at the center of the rear cover plate (3), the plurality of long blades (1) and short blades (2) are alternately arranged and evenly distributed in the circumferential direction of the rear cover plate (3), the long blade (1) includes a first long blade segment (11) and a second long blade segment (12) connected to each other, the first long blade segment (11) rotates around the inlet end point O of the first long blade segment (11) and forms an angle of θ with the diameter of the rear cover plate (3) passing through the end point O, the second long blade segment (12) rotates around the connection point A between the first long blade segment (11) and the second long blade segment (12) and forms an angle of θ with the first long blade segment (11) The extension line forms an angle of φ; the short blade (2) includes a first short blade segment (21) and a second short blade segment (22) connected to each other, the connection point of the first short blade segment (21) and the second short blade segment (22) is B, the distances S between the connection points A and B and the center of the circle of the rear cover (3) are equal, and the angle between the second short blade segment (22) and the radius passing through the connection point B is equal to the angle between the second long blade segment (12) and the radius passing through the connection point A; and the second short blade segment (22) and the extension line of the first short blade segment (21) form an angle of φ; the second long blade segment (12) and the second short blade segment (22) both extend to the edge of the rear cover (3), the inlet diameter D1 of the long blade (1) is smaller than the inlet diameter D1′ of the short blade (2); the width b2 of the long blade (1) is smaller than the width b2′ of the short blade (2).

2. The open swirl pump impeller structure with high and low oblique folded blades according to claim 1 is characterized in that: The inlet diameter D1 of the long blade (1) is Where coefficient K1 = 1.95 ~ 2.35; D1 is the inlet diameter of the long blade (1), in m; Q is the flow rate, in m 3 / s; n is the impeller speed, unit is r / min; The inlet diameter D1′ of the short blade (2) is D1′=D1+(1-k1′)(2S-D1), wherein k1′=0.45-0.65; The outer diameter D2 of the long blade (1) is Wherein the coefficient K2 is 21.5 to 23.5; D2 is the outer diameter of the long blade (1), in m; g is the acceleration due to gravity, in m / s 2 ; H is the lift, unit is m; The outer diameter D2′ of the short blade (2) is D2′=D2; The width b2 of the long blade (1) is b2=(0.16-0.19)D2; The width b2′ of the short blade (2) is b2′=(1.2-1.5)b2; The distance S between the connection point A of the first long blade segment (11) and the second long blade segment (12) and the center of the rear cover plate (3) is S=1 / 2[D1+(1-k)(D2-D1)], where k=0.25-0.

35.

3. The open swirl pump impeller structure with high and low oblique folded blades according to claim 1 is characterized in that: The total number of the long blades (1) and the short blades (2) is 8 to 12 and is an even number, and the number of the long blades (1) and the short blades (2) are equal.

4. The open swirl pump impeller structure with high and low oblique folded blades according to claim 1 is characterized in that: The angle θ formed by the first long blade section (11) and the diameter of the rear cover plate (3) through the end point O is θ=10° to 70°, and its inclination direction is the same as or opposite to the impeller rotation direction.

5. The open swirl pump impeller structure with high and low oblique folded blades according to claim 1 is characterized in that: The angle formed by the extension line of the second long blade section (12) and the first long blade section (11) for Its inclination direction is the same as or opposite to the impeller rotation direction.

6. The open swirl pump impeller structure with high and low oblique folded blades according to claim 1 is characterized in that: The number of the back blades (4) is 6 to 10; the thickness of the back blades (4) is equal to that of the long blades (1).

7. The open swirl pump impeller structure with high and low oblique folded blades according to claim 1 is characterized in that: The thickness of the short blade (2) is greater than the thickness of the long blade (1).

8. The open swirl pump impeller structure with high and low oblique folded blades according to claim 1 is characterized in that: The thickness of the short blade (2) is 1 mm greater than the thickness of the long blade (1).

9. An open vortex pump, characterized in that: An open swirl pump impeller comprising high and low oblique folded blades as claimed in any one of claims 1 to 8, wherein the impeller is mounted on the rear side of a pump chamber.

10. The open vortex pump according to claim 9, characterized in that: A gap of 1 to 2 mm is provided between the back blade (4) and the pump housing (6).

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