CN111637061A - Energy-saving vertical axial-flow pump structure with half-adjusting blades - Google Patents

Abstract

The invention discloses an energy-saving vertical axial-flow pump structure with half-adjusting blades, which comprises a water outlet bent pipe, a pump shaft, a guide blade body, blades, an impeller and an impeller chamber, wherein the impeller and the blades are arranged in the impeller chamber, and the impeller is connected with the lower part of the pump shaft; the guide vane body is positioned in a guide vane pipe above the impeller, the upper end of the pump shaft penetrates through a bent arm of the water outlet bent pipe, an upper water guide bearing and a lower water guide bearing are connected to the pump shaft, and a pump shaft sleeve is sleeved outside the pump shaft; the pump shaft sleeve is positioned between the upper water guide bearing and the lower water guide bearing; the pump has the advantages of low noise, high efficiency, good cavitation performance and long service life in the operation process.

Description

Energy-saving vertical axial-flow pump structure with half-adjusting blades

Technical Field

The invention belongs to the technical field of axial flow pumps, and particularly relates to an energy-saving vertical axial flow pump structure with half-adjusting blades.

Background

An axial flow pump is a type of vane pump, and a liquid to be transported flows in a pump shaft direction by thrust of a rotating impeller vane. The axial flow pump is generally vertical, the impeller is immersed under water, and the axial flow pump also has a horizontal or inclined type, and the blades of the axial flow pump are divided into a fixed structure and an adjustable structure. When the pump shaft is driven by the motor to rotate, the blades and the axis of the pump shaft have a certain helical angle, so that thrust is generated on liquid, and the liquid is pushed out to be discharged along the discharge pipe. When the liquid is pushed out, a partial vacuum is formed at the original position, the outside liquid is sucked into the impeller along the inlet pipe under the action of the atmospheric pressure, and the pump can continuously suck and discharge the liquid as long as the impeller continuously rotates. The axial flow pump belongs to a pump variety with large flow and low lift, is usually used as a special pump for directionally conveying large-flow liquid in industrial and agricultural production, and is mainly suitable for occasions with low lift and large flow, such as irrigation, waterlogging drainage, dock drainage and water level adjustment of a canal lock, or is used as a large-scale circulating water pump of a power plant. The axial flow pump with higher lift can be used for water jet propulsion of shallow water ships.

The vertical axial flow pump is designed according to clear water medium, and is widely applied to irrigation and drainage projects in southern water network areas. As the yellow river water with high sand content is pumped, the pump has a plurality of problems in the operation process, which are mainly shown as follows: the technical water supply device is unreasonable in design, silt water flow invades the rubber guide bearing, so that the journal of the pump main shaft is excessively fast and eccentrically worn, vibration occurs in the running of a unit, the noise exceeds 90dB, and the overhaul period is only 368.92 hours on average, so that a pump station is difficult to form the production capacity, and the normal irrigation of an irrigation area is seriously influenced; the water pump runner blade is made of common carbon steel, the surface processing is rough, the molded line is inaccurate, and the blade is abraded and scrapped after being operated for 2000 + 2500 h generally; the water pump runner adopts a hydraulic model of the last 40 century abroad, and the efficiency of the unit device is low; the technical water supply consumption is large.

Disclosure of Invention

The invention overcomes the defects of the prior art and provides the energy-saving vertical axial-flow pump structure with the half-adjusting blades, and the pump has the advantages of low noise, high efficiency, good cavitation performance and long service life in the operation process.

In order to achieve the purpose, the invention is realized by the following technical scheme:

the energy-saving vertical axial-flow pump structure with the semi-adjusting blades comprises a water outlet bent pipe, a pump shaft, a guide blade body, blades, an impeller and an impeller chamber, wherein the impeller and the blades are arranged in the impeller chamber, and the impeller is connected with the lower part of the pump shaft; the guide vane body is positioned in a guide vane pipe above the impeller, the upper end of the pump shaft penetrates through a bent arm of the water outlet bent pipe, an upper water guide bearing and a lower water guide bearing are connected to the pump shaft, and a pump shaft sleeve is sleeved outside the pump shaft; the pump shaft sleeve is positioned between the upper water guide bearing and the lower water guide bearing.

Furthermore, the bottom of the pump shaft is provided with a taper shaft structure and is connected with the impeller through a taper shaft.

Furthermore, the center of the upper part of the impeller is provided with a taper hole, and a taper shaft is connected in the taper hole.

Further, the impeller is connected with an impeller hub body.

Further, the impeller chamber is of a cylindrical structure.

Further, the blade is of a fixed-paddle structure.

Furthermore, an upper flange is arranged at the top of the pump shaft sleeve, and a lower flange is arranged at the bottom of the pump shaft sleeve; the top of the pump shaft sleeve is connected with the upper water guide bearing through an upper flange, and the bottom of the pump shaft sleeve is connected with the bottom of the lower water guide bearing through a lower flange.

Furthermore, an upper flange connecting piece is arranged inside the upper water guide bearing, an upper flange accommodating groove and a connecting screw hole are formed in the upper flange connecting piece, the upper flange accommodating groove is matched with the upper flange, and the upper flange connecting piece is connected with the upper flange through the connecting screw hole; the lower flange connecting piece is arranged in the lower water guide bearing and is provided with a connecting bolt, the lower flange connecting piece is connected with the lower flange through the connecting bolt, and the lower flange is positioned on the outer side of the bottom of the lower flange connecting piece.

Compared with the prior art, the invention has the following beneficial effects:

the energy-saving vertical axial-flow pump structure with the half-adjusting blades has the advantages that the operation condition of the water pump is not obviously changed when the water level of a river bed changes and the lift amplitude of a pump station is large. Through the optimization and transformation of the technical water supply device, the yellow river water is thoroughly isolated from the lower guide bearing of the water pump, and silt cannot enter the lower guide bearing. The optimized axial flow pump has the advantages of obviously reduced water consumption, large operation flow, low power and favorable hydraulic property of the impeller. The water pump has the advantages of low noise, basically no vibration, high efficiency, good cavitation performance and long service life in the operation process.

Drawings

Fig. 1 is a schematic structural diagram of an apparatus in embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram of a pump shaft sleeve in the device according to embodiment 1 of the present invention.

Fig. 3 is a schematic structural diagram of an apparatus in embodiment 2 of the present invention.

Fig. 4 is a schematic view of a connection relationship between a pump shaft sleeve and an upper water guide bearing in the device according to embodiment 2 of the present invention.

Fig. 5 is a schematic structural view of an upper flange connecting piece in the device of embodiment 2 of the invention.

Fig. 6 is a schematic structural view of a connection relationship between a pump shaft sleeve and a lower water guide bearing in the device according to embodiment 2 of the present invention.

Fig. 7 is a schematic view of a structural cascade connection relationship of impellers in the device according to embodiment 2 of the present invention.

Fig. 8 is a schematic view of a flow channel profile of a device and a master pump in embodiment 2 of the present invention.

The impeller comprises a 1-water bent pipe, a 2-pump shaft, a 3-pump shaft sleeve, a 4-guide vane body, a 5-vane, a 6-impeller, a 7-impeller hub body, an 8-upper water guide bearing, a 9-lower water guide bearing, a 10-impeller chamber, a 21-taper shaft, a 31-upper flange, a 32-lower flange, a 61-taper hole, a 62-connecting hole, a 63-clamping concave part, a 64-connecting cavity, a 65-fastening nut, a 66-limiting flat key, an 81-upper flange connecting piece, an 82-upper flange accommodating groove, a 91-lower flange connecting piece, a 92-connecting bolt and a 93-clamping part.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.

Example 1

As shown in fig. 1-2, the energy-saving vertical axial-flow pump structure with half-adjusting blades comprises a water outlet elbow 1, a pump shaft 2, a guide blade body 4, blades 5, an impeller 6 and an impeller chamber 10, wherein the impeller 6 and the blades 5 are arranged in the impeller chamber 10, and the impeller 6 is connected with the lower part of the pump shaft 2; the guide vane body 4 is positioned in a guide vane pipe above the impeller 6, the upper end of the pump shaft 2 penetrates through a bent arm of the water outlet bent pipe 1, an upper water guide bearing 8 and a lower water guide bearing 9 are connected to the pump shaft 2, and a pump shaft sleeve 3 is sleeved outside the pump shaft 2; the pump shaft sleeve 3 is positioned between the upper water guide bearing 8 and the lower water guide bearing 9, and the pump shaft sleeve 3 is communicated with the water guide bearing 8 and the lower water guide bearing 9.

The bottom of the pump shaft 2 is provided with a taper shaft 21 structure and is connected with the impeller 6 through the taper shaft; the center of the upper part of the impeller 6 is provided with a taper hole 61, and a taper shaft 21 is connected in the taper hole 61.

The impeller 6 is provided with an impeller hub body 7.

The blade 5 is of a fixed-paddle structure.

Example 2

Example 1 in an apparatus, the impeller chamber 10 is provided as a cylindrical structure.

As shown in fig. 3-7, the pump shaft sleeve 3 is provided with an upper flange 31 at the top and a lower flange 32 at the bottom; the top of the pump shaft sleeve 3 is connected with the upper water guide bearing 8 through an upper flange 31, and the bottom of the pump shaft sleeve 3 is connected with the bottom of the lower water guide bearing 9 through a lower flange 32.

An upper flange connecting piece 81 is arranged inside the upper water guide bearing 8, an upper flange accommodating groove 82 and a connecting screw hole are formed in the upper flange connecting piece 81, the upper flange accommodating groove 82 is matched with the upper flange 31, and the upper flange connecting piece 81 is connected with the upper flange 31 through the connecting screw hole;

the inside lower flange connecting piece 91 that is provided with of lower water guide bearing 9, lower flange connecting piece 91 are provided with connecting bolt 92, and lower flange connecting piece 91 passes through connecting bolt 91 and connects lower flange 32, and lower flange 32 is located the lower flange connecting piece 91 bottom outside.

Be provided with joint portion 93 on the lower water guide bearing 9, 6 tops of impeller are provided with joint indent 63, impeller 6 is through joint indent 63 nested connection in joint portion 93.

The side wall of the impeller 6 is provided with a connecting hole 62, and the blades 5 are connected in the connecting hole 62.

The impeller 6 is internally provided with a connecting cavity 64, the taper hole 7 penetrates through the connecting cavity and the outside, and the bottom of the taper shaft 21 is positioned in the connecting cavity 64 and fixed through a fastening nut 65.

The side wall of the impeller 6 is provided with a limiting hole, the side wall of the taper shaft 21 is provided with a limiting groove 22, the limiting hole and the limiting groove are correspondingly arranged, and a limiting flat key 66 is inserted into the limiting hole and the limiting groove.

As shown in fig. 1 and 2, the structure of the pump shaft sleeve is schematically illustrated. The pump shaft sleeve 3 is positioned between the upper water guide bearing and the lower water guide bearing of the main shaft of the water pump. The technical water supply device for the drainage guide bearing is improved, technical water enters from the upper drainage guide bearing, passes through the pump shaft sleeve 3 and is discharged from the bottom of the drainage guide bearing. The water supply pressure is 0.2-0.25 MPa, so that the sand-containing water flow is completely isolated outside the pump shaft sleeve 3, the sand is prevented from entering the inside of the bearing, and the pump shaft is ensured not to be worn out prematurely. The pump shaft and the impeller are in a taper shaft connecting structure.

The impeller chamber is of a cylindrical structure, so that the flow area in front of the guide vane 4 can be increased, the flow capacity is greatly increased, and the axial surface speed is reduced, so that the abrasion and damage of the guide vane are greatly reduced; the blade 5 is in a fixed paddle type structure, the half impeller chamber is manufactured by adopting a large half motor shell process, the half impeller chamber is firstly formed in a full circle mode, and after annealing, plasma cutting is adopted for surface splitting. And finishing the combined whole circle to ensure the machining precision of the impeller chamber.

The half impeller chamber is manufactured by adopting a large half motor shell process, the blades are made of OCr13Ni5Mo stainless steel materials, and the guide vanes and the impeller chamber are made of Q235 steel plates. The machining precision of the blade profile is +/-1.0 mm, and the blade is assembled and welded with the impeller body after being formed.

The guide vane is formed by hot pressing twice through a molded line pressing die, and is assembled and welded with the guide vane body 4 into a whole after the water inlet and outlet edges are corrected to be qualified through a molded line sample plate so as to ensure the uniformity of a flow passage and the shape and position sizes of the water inlet and outlet edges.

Fig. 8 is a schematic diagram of the profile of the original pump and the modified pump flow channel. Wherein, the broken line represents the runner molded line of the original pump, and the solid line represents the runner molded line of the pump after the optimization transformation. The diameter sizes of the impeller hub body 7 and the guide vane body 4 are properly reduced to 5/7 of the original diameter size, and meanwhile, because the impeller chamber is of a cylindrical structure, the flow channel of the pump after optimized transformation is wide and wide, and the hydraulic performance is better. The impeller 6 and the novel guide vane of the axial flow pump need to adopt a hydraulic model with excellent performance in design and manufacture.

While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Claims (7)

1. The energy-saving vertical axial-flow pump structure with the semi-adjusting blades comprises a water outlet bent pipe (1), a pump shaft (2), a guide blade body (4), blades (5), an impeller (6) and an impeller chamber (10), and is characterized in that the impeller chamber (10) is internally provided with the impeller (6) and the blades (5), and the impeller (6) is connected with the lower part of the pump shaft (2); the guide vane body (4) is positioned in a guide vane pipe above the impeller (6), the upper end of the pump shaft (2) penetrates through a bent arm of the water outlet bent pipe (1), an upper water guide bearing (8) and a lower water guide bearing (9) are connected to the pump shaft (2), and a pump shaft sleeve (3) is sleeved outside the pump shaft (2); the pump shaft sleeve (3) is positioned between the upper water guide bearing (8) and the lower water guide bearing (9).

2. The energy-saving vertical axial flow pump structure with half regulation blades according to claim 1, characterized in that the blades (5) are of fixed paddle type structure.

3. The energy saving vertical axial flow pump structure with half adjustment vanes according to claim 1, characterized in that the impeller (6) is provided with an impeller hub body (7).

4. The energy efficient vertical axial flow pump structure with semi-adjustable vanes according to claim 1, characterized in that the impeller chamber (10) is of cylindrical structure.

5. The energy-saving vertical axial-flow pump structure with half-adjusting blades according to claim 1, characterized in that the bottom of the pump shaft (2) is provided with a taper shaft (21), the center of the upper part of the impeller (6) is provided with a taper hole (61), the taper shaft (21) is connected in the taper hole (61), and the pump shaft (2) and the impeller (6) are connected through the taper shaft (21).

6. The energy-saving vertical axial-flow pump structure with half-adjusting blades according to claim 1, characterized in that the pump shaft sleeve (3) is provided with an upper flange (31) at the top and a lower flange (32) at the bottom; the top of the pump shaft sleeve (3) is connected with the upper water guide bearing (8) through an upper flange (31), and the bottom of the pump shaft sleeve (3) is connected with the lower water guide bearing (9) through a lower flange (32).

7. The energy-saving vertical axial-flow pump structure with half-adjusting blades as claimed in claim 6, wherein an upper flange connecting piece (81) is arranged inside the upper water guide bearing (8), an upper flange accommodating groove (82) and a connecting screw hole are arranged on the upper flange connecting piece (81), the upper flange accommodating groove (82) is matched with the upper flange (31), and the upper flange connecting piece (81) is connected with the upper flange (31) through the connecting screw hole; the lower flange connecting piece (91) is arranged in the lower water guide bearing (9), the lower flange connecting piece (91) is provided with a connecting bolt (92), the lower flange connecting piece (91) is connected with the lower flange (32) through the connecting bolt (91), and the lower flange (32) is positioned on the outer side of the bottom of the lower flange connecting piece (91).

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