High-lift multi-stage impeller submersible shaft and mixed-flow pump

Abstract

A high-lift multi-stage impeller submersible shaft and mixed flow pump comprises a first-stage impeller assembly, a second-stage impeller assembly, a water suction chamber and a guide vane body, and the first-stage impeller assembly and the second-stage impeller assembly are connected through a first-stage impeller shell and a second-stage impeller shell to form the multi-stage impeller connected axial flow pump. The bottom end of a first-stage impeller shell of the first-stage impeller assembly is connected with the water suction chamber, the upper end of a second-stage impeller shell of the second-stage impeller assembly is connected with the guide vane body, the water suction chamber, the first-stage impeller assembly, the second-stage impeller assembly and the guide vane body are connected in series through the same shaft, the upper end of the shaft is upwards connected with a motor rotor and a stator in series, and the top end of the shaft is connected with the upper inner cover. The upper inner cover is connected with an upper end cover. The multi-stage water pump structure is adopted, the multi-stage water pump is composed of multiple sets of impellers, the flow lift of the water pump is multiplied, the problems that an existing shaft and mixed-flow pump is low in lift, limited in self-suction capacity, steep in efficiency curve, narrow in efficient area and the like are solved, and the phenomenon that the flow of the multi-stage water pump is smaller than that of an axial flow pump is changed.

Description

Technical Field

[0001] The present invention relates to the technical fields of axial flow pumps and multistage water pumps, and particularly to a multistage impeller submersible axial and mixed flow pump with a high lift. Background Art

[0002] Traditional axial flow pumps have been applied in fields such as large-scale agricultural irrigation and drainage, urban drainage, conveying circulating water in thermal power plants that require a large amount of cooling water, and upgrading the water level of shipyards, with a wide range of uses. The structure of traditional axial flow pumps is that the water pump and the motor are coaxially split. The motor is a dry stator structure, and the water pump is a single-stage impeller structure, and is connected to the water inlet chamber and the water outlet chamber. Such water pumps have reliable performance and have been used at home and abroad for many years. This type of pump is a pump that relies on the force generated by the blades of the rotating impeller on the liquid to convey the liquid along the axial direction. It relies on the lift generated when the impeller rotates in water to transfer energy to the water, enabling the axial flow pump to pump out water. Since the axial flow pump operates underwater, it can greatly simplify the civil engineering and building structure of the pump, reduce the installation area, and save project costs. This type of water pump has the following disadvantages: First, axial and mixed flow pumps mainly use the thrust generated by the high-speed rotation of the impeller to lift water. The lift generated by the rotation of the blades of axial and mixed flow pumps pushes the water from below to above. The axial flow pump is a single-stage impeller structure, and several factors cause the lift of the water pump to be low. Currently, the lift of axial and mixed flow pumps on the market is below 20m. Second, the self-priming ability of axial and mixed flow pumps is limited, the efficiency curve is steep, the high-efficiency area is relatively narrow, and many axial flow pumps have an inflection point when they are at 40%-60% of their designed flow rate, and this working area is very unstable. Summary of the Invention

[0003] The present invention aims to solve the deficiencies of the prior art and provides a multistage impeller submersible axial and mixed flow pump with a high lift.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A multistage impeller submersible axial and mixed flow pump with a high lift includes a first-stage impeller assembly, a second-stage impeller assembly, a water suction chamber, and a guide vane body. The first-stage impeller assembly and the second-stage impeller assembly are connected through a first-stage impeller housing and a second-stage impeller housing to form an axial flow pump with a multistage impeller connection. The bottom end of the first-stage impeller housing of the first-stage impeller assembly is connected to the water suction chamber, and the upper end of the second-stage impeller housing of the second-stage impeller assembly is connected to the guide vane body. The water suction chamber, the first-stage impeller assembly, the second-stage impeller assembly, and the guide vane body are connected in series by the same shaft. The upper end of the shaft is connected in series with a motor rotor and a stator upward, the top of the shaft is connected to an upper inner cover, the upper inner cover is connected to an upper end cover, the top of the upper end cover is connected to an upper cover, and the lower part of the shaft is connected to a lower end cover above the guide vane body.

[0006] The described first-stage impeller assembly includes first-stage blades, a first-stage impeller housing, and a first-stage hub. The first-stage blades are installed on the first-stage hub. A first-stage blade adjusting device is provided on the first-stage hub. The first-stage blade adjusting device adjusts the angle of the first-stage blades according to the requirements of flow rate and head. The first-stage impeller housing covers the outside of the first-stage blades.

[0007] The described second-stage impeller assembly includes a second-stage impeller housing, second-stage blades, and a second-stage hub. The second-stage hub is arranged inside the second-stage impeller housing. The second-stage blades are installed on the second-stage hub. A second-stage blade adjusting device is provided on the second-stage hub. The second-stage blade adjusting device adjusts the angle of the second-stage blades according to the requirements of flow rate and head.

[0008] A flow guide cap is arranged in the described water suction chamber, and the flow guide cap is connected to the lower end of the first-stage hub.

[0009] An inner cavity is arranged in the described guide vane body, and support guide vanes are connected between the side wall of the inner cavity and the outer wall of the guide vane body.

[0010] An axial key I and an axial key II are respectively installed on the shaft on the first-stage hub and the second-stage hub.

[0011] A first-stage seal and a first-stage transmission bearing are arranged inside the inner cavity of the guide vane body on the shaft. A second-stage seal is arranged above the lower end cover at the top of the inner cavity of the guide vane body on the shaft, and a second-stage rotating bearing is arranged below the lower end cover.

[0012] The described motor rotor is of a copper bar squirrel-cage structure, and the inner wall of the motor rotor is closely adjacent to the outer wall of the stator.

[0013] A third-stage rotating bearing and an oil baffle are arranged below the described upper inner cover. A cable outlet is arranged on the upper inner cover, and a cable gland is arranged at the cable outlet.

[0014] An axial flow pump main cable outlet is arranged on the described upper cover, and a main cable seal cover is arranged at the axial flow pump main cable outlet.

[0015] The beneficial effects of the present invention are as follows: The present invention adopts the structure of a multi-stage water pump, which is composed of multiple groups of impellers, and multiplicatively improves the flow rate and head of the water pump, solves the problems of low head, limited self-priming ability, steep efficiency curve, and narrow high-efficiency area of existing axial and mixed-flow pumps, and also changes the phenomenon that the flow rate of multi-stage water pumps is smaller than that of axial flow pumps. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the present invention;

[0017] Figure 2 It is a schematic diagram of the internal structure of the first-stage impeller housing of the first-stage impeller assembly of the present invention;

[0018] In the figure: 1 - water absorption chamber; 2 - flow guiding cap; 3 - first-stage blade; 4 - first-stage blade adjusting device; 5 - first-stage impeller housing; 6 - first-stage hub; 7 - second-stage blade; 8 - second-stage impeller housing; 9 - second-stage blade adjusting device; 10 - second-stage hub; 11 - guide vane body; 12 - supporting guide vane; 13 - first-stage seal; 14 - first-stage driving bearing; 15 - lower end cover; 16 - stator; 17 - motor rotor; 18 - shaft; 19 - oil baffle; 20 - upper inner cover; 21 - third-stage rotating bearing; 22 - cable gland; 23 - upper end cover; 24 - upper cover; 25 - main cable sealing cover; 26 - shaft key I; 27 - shaft key II; 28 - second-stage rotating bearing; 29 - second-stage seal; 30 - electric drive winding;

[0019] The following will be described in detail with reference to the embodiments of the present invention and the accompanying drawings. Specific embodiments

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] A multi-stage impeller submersible axial and mixed-flow pump with high lift includes a first-stage impeller assembly, a second-stage impeller assembly, a water absorption chamber 1 and a guide vane body 11. The first-stage impeller assembly and the second-stage impeller assembly are connected through the first-stage impeller housing 5 and the second-stage impeller housing 8 to form an axial-flow pump with multi-stage impeller connection. The bottom end of the first-stage impeller housing 5 of the first-stage impeller assembly is connected to the water absorption chamber 1, and the upper end of the second-stage impeller housing 8 of the second-stage impeller assembly is connected to the guide vane body 11. The water absorption chamber 1, the first-stage impeller assembly, the second-stage impeller assembly and the guide vane body 11 are connected in series by the same shaft 18. The upper end of the shaft 18 is connected in series with the motor rotor 17 and the stator 16 upwards. The top end of the shaft 18 is connected to the upper inner cover 20, the upper end cover 23 is connected to the upper inner cover 20, the top end of the upper end cover 23 is connected to the upper cover 24, and the lower part of the shaft 18 is connected to the lower end cover 15 above the guide vane body 11.

[0022] The first-stage impeller assembly includes a first-stage blade 3, a first-stage impeller housing 5 and a first-stage hub 6. The first-stage blade 3 is installed on the first-stage hub 6. A first-stage blade adjusting device 4 is arranged on the first-stage hub 6. The first-stage blade adjusting device 4 adjusts the angle of the first-stage blade 3 according to the requirements of flow rate and lift. The first-stage impeller housing 5 covers the outside of the first-stage blade 3.

[0023] The second-stage impeller assembly includes a second-stage impeller housing 8, a second-stage blade 7 and a second-stage hub 10. The second-stage hub 10 is arranged in the second-stage impeller housing 8. The second-stage blade 7 is installed on the second-stage hub 10. A second-stage blade adjusting device 9 is arranged on the second-stage hub 10. The second-stage blade adjusting device 9 adjusts the angle of the second-stage blade 7 according to the requirements of flow rate and lift.

[0024] A flow guiding cap 2 is arranged in the water absorption chamber 1, and the flow guiding cap 2 is connected to the lower end of the first-stage hub 6.

[0025] An inner cavity is provided inside the guide vane body 11, and support guide vanes 12 are connected between the side wall of the inner cavity and the outer wall of the guide vane body 11.

[0026] Shaft keys I 26 and shaft keys II 27 are respectively installed on the first-stage hub 6 and the second-stage hub 10 on the shaft 18.

[0027] A first-stage seal 13 and a first-stage transmission bearing 14 are arranged inside the inner cavity of the guide vane body 11 on the shaft 18, a second-stage seal 29 is arranged above the lower end cover 15 at the top of the inner cavity of the guide vane body 11 on the shaft 18, and a second-stage rotating bearing 28 is arranged below the lower end cover 15.

[0028] The motor rotor 17 is of a copper bar squirrel-cage structure, and the inner wall of the motor rotor 17 is close to the outer wall of the stator 16.

[0029] A third-stage rotating bearing 21 and an oil baffle 19 are arranged below the upper inner cover 20, a cable outlet is arranged on the upper inner cover 20, and a cable gland 22 is arranged at the cable outlet.

[0030] An axial flow pump main cable outlet is arranged on the upper cover 24, and a main cable seal cover 25 is arranged at the axial flow pump main cable outlet.

[0031] When the present invention works, the stator 16 winds the winding wire in the stator slots to form an electric drive winding 30. The motor rotor 17 is of a copper bar squirrel-cage structure, and the inner wall of the motor rotor 17 is close to the outer wall of the stator 16. The center of the stator 16 is connected in series with the core of the shaft 18. The bottom end of the stator 16 is connected to the lower end cover 15, and a second-stage rotating bearing 28 is installed here. The outer wall of the lower end cover 15 is connected to the outer wall of the guide vane body 11, and the guide vane body 11 uses a second-stage seal 29. A first-stage rotating bearing 14 and a first-stage seal 13 are installed in the inner cavity of the guide vane body 11. The second-stage impeller assembly includes a second-stage impeller housing 8, which is internally provided with a second-stage hub 10, second-stage blades 7, and a second-stage blade adjusting device 9. The second-stage impeller housing 8 is connected to the guide vane body 10. The shaft 18 passes through the second-stage hub 10 and is fixed on the second-stage hub 10 with a shaft key II 27. The second-stage impeller assembly is connected to the first-stage impeller assembly through the second-stage impeller housing 8. The first-stage impeller housing 5 of the first-stage impeller assembly is internally provided with a first-stage hub 6, a first-stage blade adjusting device 4, and first-stage blades 3. The first-stage blade adjusting device 4 and the second-stage blade adjusting device 9 on the first-stage hub 6 and the second-stage hub 10 can adjust the angles of the first-stage blades 3 and the second-stage blades 7 according to the requirements of flow rate and head. The lower end of the first-stage hub 6 is connected to the flow guide cap 2. The upper end of the motor stator 16 is provided with an upper inner cover 20 and a third-stage rotating bearing 21 and an oil baffle 19 are arranged inside it; the winding cable extends out of the upper inner cover 20 to form a wiring area with the upper end cover 23, and the main cable extends out of the axial flow pump main cable outlet of the upper cover 24, and a main cable seal cover 25 is added here.

[0032] The working medium of the present invention is water. It adopts multiple groups of impellers and can operate underwater with double or multi-layer mechanical seals.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "joined", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or capable of communicating with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The above has described the present invention by way of example in conjunction with the drawings. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various improvements are made by adopting the method concept and technical solution of the present invention, or directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A high-lift multi-stage impeller submersible shaft mixed flow pump, characterized in that: The invention comprises a first-stage impeller assembly, a second-stage impeller assembly, a water suction chamber (1) and a guide vane body (11). The first-stage impeller assembly and the second-stage impeller assembly are connected through a first-stage impeller housing (5) and a second-stage impeller housing (8) to form an axial flow pump with a multi-stage impeller connection. The bottom end of the first-stage impeller housing (5) of the first-stage impeller assembly is connected to the water suction chamber (1), and the upper end of the second-stage impeller housing (8) of the second-stage impeller assembly is connected to the guide vane body (11). The water suction chamber (1), the first-stage impeller assembly, the second-stage impeller assembly and the guide vane body (11) are connected in series via a same shaft (18). The upper end of the shaft (18) is connected in series upwardly to a motor rotor (17) and a stator (16). The top end of the shaft (18) is connected to an upper inner cover (20), the upper inner cover (20) is connected to an upper end cover (23), the top end of the upper end cover (23) is connected to an upper cover (24), and the lower part of the shaft (18) is connected to a lower end cover (15) above the guide vane body (11).

2. A high-lift multi-stage impeller submersible shaft and mixed flow pump according to claim 1, characterized in that: The first-stage impeller assembly comprises a first-stage blade (3), a first-stage impeller housing (5) and a first-stage hub (6); the first-stage blade (3) is mounted on the first-stage hub (6); a first-stage blade adjusting device (4) is arranged on the first-stage hub (6); the first-stage blade adjusting device (4) adjusts the angle of the first-stage blade (3) according to the requirements of flow head; and the first-stage impeller housing (5) is covered on the outside of the first-stage blade (3).

3. A high-lift multi-stage impeller submersible shaft and mixed flow pump according to claim 2, characterized in that: The secondary impeller assembly comprises a secondary impeller housing (8), secondary blades (7) and a secondary hub (10); the secondary hub (10) is arranged in the secondary impeller housing (8); the secondary blades (7) are mounted on the secondary hub (10); a secondary blade adjusting device (9) is arranged on the secondary hub (10); the secondary blade adjusting device (9) adjusts the angle of the secondary blades (7) according to the flow head requirement.

4. A high-lift multi-stage impeller submersible shaft and mixed flow pump according to claim 3, characterized in that: A flow guide cap (2) is arranged in the water absorption chamber (1), and the flow guide cap (2) is connected to the lower end of the first-stage hub (6).

5. A high-lift multi-stage impeller submersible shaft and mixed flow pump according to claim 4, characterized in that: An inner cavity is arranged in the guide vane body (11), and a supporting guide vane (12) is connected between the side wall of the inner cavity and the outer wall of the guide vane body (11).

6. A high-lift multi-stage impeller submersible shaft mixed flow pump according to claim 5, characterized in that: The shaft (18) is provided with a shaft key I (26) and a shaft key II (27) respectively on the primary hub (6) and the secondary hub (10).

7. A high-lift multi-stage impeller submersible shaft and mixed flow pump according to claim 6, characterized in that: A primary seal (13) and a primary transmission bearing (14) are arranged on the shaft (18) inside the inner cavity of the guide vane body (11); a secondary seal (29) is arranged on the shaft (18) above the top lower end cover (15) of the inner cavity of the guide vane body (11); and a secondary rotating bearing (28) is arranged below the lower end cover (15).

8. A high-lift multi-stage impeller submersible shaft mixed flow pump according to claim 7, characterized in that: The motor rotor (17) is a copper bar squirrel cage structure, and the inner wall of the motor rotor (17) is close to the outer wall of the stator (16).

9. A high-lift multi-stage impeller submersible shaft mixed flow pump according to claim 8, characterized in that: A three-stage rotating bearing (21) and an oil shielding cover (19) are arranged under the upper inner cover (20), a cable outlet is arranged on the upper inner cover (20), and a cable gland (22) is arranged at the cable outlet.

10. A high-lift multi-stage impeller submersible shaft and mixed flow pump according to claim 9, characterized in that: The upper cover (24) is provided with an axial flow pump main cable outlet, and a main cable sealing cover (25) is provided at the axial flow pump main cable outlet.

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