CN110701061A - Multistage tubular pump device with novel structure - Google Patents

Abstract

A multi-stage tubular pump device with a new structure belongs to the technical field of water conservancy engineering equipment. The front water guide cone of the impeller has an integrated structure. A keyway is reserved in the wheel hub. The key is connected with the shaft to fix the impeller and the front water guide cone. The impeller hub The blade installation holes are reserved at the place, and the blade root and the hub are fixed with countersunk bolts. The guide vane is arranged at the water outlet of the impeller. The water flow passes through the first impeller, and the kinetic energy increases. The flow state of the water flow at the inlet of the second impeller is changed, so that the flow energy of the water flowing through the second impeller is further increased, and the lift and efficiency are significantly improved. Improve the efficiency and head of the pump unit. The blade and the rotor of the invention do not need to be welded, realizes the adjustment of the blade angle, reduces the influence of gap backflow on the flow field, reduces the influence of friction torque on the performance of the pump device, and effectively improves the efficiency and head of the pump device.

Description

A Novel Structure of Multistage Tubular Pump Device

technical field

The invention belongs to the technical field of hydraulic engineering equipment, and relates to a through-flow pump device, in particular to a multi-stage through-flow pump device with a novel structure.

Background technique

At present, axial flow pumps are widely used in agricultural irrigation, drainage and water transfer projects due to their large flow and low lift. Full tubular pump is a new type of motor pump that combines submersible motor and tubular technology. It has the characteristics of large flow, low lift, small hydraulic loss, compact structure and convenient installation. The principle of the fully tubular pump is to install the impeller in the inner cavity of the motor rotor, the blades are welded with the motor rotor to make it a part of the rotor, and through the electromagnetic action between the motor stator and the rotor, the impeller is driven to rotate, and the water flow from The inner cavity of the rotor flows through, and there is a certain gap between the rotor and the stator. The gap is filled with water, which will inevitably generate a large friction loss of the wheel disc, increase the torque, and then reduce the efficiency; and under the action of the impeller inlet pressure , it will form a gap backflow from the impeller outlet to the impeller inlet, affecting the flow field in the impeller chamber, resulting in hydraulic loss, reduction of efficiency and lift, which is also an urgent problem to be solved at present.

SUMMARY OF THE INVENTION

The purpose of the present invention is to propose a multi-stage tubular pump device with a novel structure in view of the deficiencies existing in the current full-tubular flow pump in the use process. It can reduce the influence of gap backflow on the flow field, reduce the influence of friction torque on the performance of the pump device, and can effectively improve the efficiency and head of the pump device.

The technical scheme of the present invention is: a multi-stage tubular pump device with a novel structure, comprising a pump housing and a shaft arranged inside the pump housing; it is characterized in that: the tubular pump device is further composed of a hub, an impeller, and a guide vane. Body, bearing, rotor, stator and water guide cone are connected and formed; the rotor is circumferentially connected and fixed with the shaft through the rotor lock nut, the rotor is circumferentially fixed with the shaft through the bearing, and the stator is fixed on the stator housing On the inner wall of the pump, the stator is sleeved on the outer side of the rotor and forms a gap with the rotor, a support is provided between the stator casing and the pump casing, the left side of the stator and the rotor is provided with a hub, the hub is The shaft is connected by a bearing, a first guide vane body is arranged between the hub and the pump casing, a first impeller is arranged on the hub on the left side of the first guide vane body, and the left side of the first impeller is There is a front water guide cone, the right side of the rotor and the stator is provided with a second impeller, the right side of the second impeller is provided with a second guide vane body, and the right side of the second guide vane body is connected with a rear water guide cone.

The rotor is connected and fixed with the shaft through two rotor locking nuts, the number of each rotor locking nut is 6, the rotor locking nuts are evenly arranged on the outer circle of the shaft, and a bearing is arranged on each of the left and right sides of the rotor. The snap ring holds the bearing in place.

The number of the supporting pieces is 6, and the supporting pieces are evenly arranged between the stator casing and the pump casing. The supporting pieces are straight plates, and one of the supporting pieces is provided with a wire outlet hole.

The first guide vane body is provided with 7 guide vanes, the guide vanes are fixed on the outside of the hub, and there are 4 bearings connected to the shaft inside the hub, and the bearings are axially connected through the positioning step on the right side and the snap ring on the left side. Fixed positioning.

The first impeller and the front water guide cone are arranged on the left side of the first guide vane body. The first impeller and the front water guide cone are integral structures. There are blade installation holes at the hub of the impeller, and three fixing holes are arranged on the circumference of the installation holes. The diameter of the impeller is 350mm, the hub-to-hub ratio is 0.4, the number of blades on the impeller is 4, and the blades are adjusted and fixed through the fixing holes.

The second impeller has the same structural dimensions as the first impeller.

The stator is supported by bearings, and a gap of 2 mm is set between the stator and the rotor.

The second guide vane body and the rear water guide cone have an integrated structure, and the structure type is the same as that of the first guide vane body.

The beneficial effects of the present invention are as follows: the multi-stage through-flow pump device with a novel structure provided by the present invention is provided with two impellers, the water guide cone in front of the impeller is an integral structure, a keyway is reserved in the hub, and the key is connected with the shaft, Fix the impeller and the front water guide cone, reserve the blade installation hole at the impeller hub, fix the blade root to the hub with countersunk bolts, arrange the guide vane at the water outlet of the impeller, the water flow passes through the first impeller, the kinetic energy is increased, and the guide vane is recovered. The water circulation at the outlet of the first impeller also changes the flow pattern of the water flow at the inlet of the second impeller, so that the flow energy of the water flowing through the second impeller is further increased, and the lift and efficiency are significantly improved. Finally, the second guide vane recovers the water flow The circulation volume can eliminate part of the residual energy of the water flow, thereby improving the efficiency and head of the pump device. Compared with the traditional tubular pump structure, the present invention does not need to weld the blade and the rotor, can realize the adjustment of the blade angle, has a compact structure, reduces the influence of the gap backflow on the flow field, reduces the influence of the friction torque on the performance of the pump device, and effectively The efficiency and head of the pump device are improved.

Description of drawings

FIG. 1 is a schematic diagram of the overall structure of the through-flow pump of the present invention.

Figure 2 is a schematic diagram of the structure of the pump shaft in the present invention.

FIG. 3 is a schematic cross-sectional structural diagram at A-A in FIG. 1 .

FIG. 4 is a schematic cross-sectional structural diagram at B-B in FIG. 1 .

In the figure: pump casing 1, hub 2, first impeller 3, first guide vane 4, bearing 5, rotor lock nut 6, support 7, stator 8, outlet hole 9, rotor 10, second impeller 11, The second guide vane body 12 , the shaft 13 , the keyway 14 , the front water guide cone 15 , the rear water guide cone 16 , the flange 17 , the snap ring 18 , the external thread 19 , the mounting hole 20 , and the fixing hole 21 .

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings:

As shown in FIG. 1 , a multi-stage tubular pump device with a new structure includes a pump casing 1 and a shaft 13 arranged inside the pump casing 1. The tubular pump device is further composed of a hub 2, an impeller, a guide vane body, a bearing 5. The rotor 10, the stator 8 and the water guide cone are connected and formed; the rotor 10 is circumferentially connected and fixed with the shaft 13 through the rotor lock nut 6, the rotor 10 is circumferentially fixed with the shaft 13 through the bearing 10, and the stator 8 is fixed on the stator. On the inner wall of the casing, the stator 8 is sleeved on the outside of the rotor 10 and forms a gap with the rotor 10. A support 7 is provided between the stator casing and the pump casing 1, and the left side of the stator 8 and the rotor 10 is provided with a hub 2. The hub 2 A first guide vane 4 is arranged between the hub 2 and the pump casing 1, and a first impeller 3 is arranged on the hub 2 on the left side of the first guide vane 4. The first impeller 3 The left side of the rotor 10 is provided with a front water guide cone 15, the right side of the rotor 10 and the stator 8 is provided with a second impeller 11, the right side of the second impeller 11 is provided with a second guide vane 12, and the right side of the second guide vane 12 is provided The connection is provided with a rear water guide cone 16 .

As shown in Figure 1, a multi-stage tubular pump device with a new structure, the rotor 10 is connected and fixed with the shaft 13 through two rotor locking nuts 6, and the number of each rotor locking nut 6 is 6, and the rotor is locked. The nuts 6 are evenly arranged on the outer circle of the shaft 13, a bearing is arranged on the left and right sides of the rotor 10, and the bearings are fixed by a snap ring; , the support member 7 is a straight plate, one of the support members 7 is provided with a wire outlet hole 9; the first guide vane body 4 is provided with 7 guide vanes, the guide vanes are fixed on the outside of the hub 2, and the inside of the hub 2 is provided with 4 and shafts The connected bearing 5 is axially positioned and fixed by the positioning step on the right side and the snap ring 5 on the left side; the first impeller 3 and the front water guide cone 15 are arranged on the left side of the first guide vane body 4, and the first impeller 3 and the front water guide cone 15 are one-piece structure, there are blade mounting holes 20 at the impeller hub, three fixing holes 21 are arranged on the circumference of the mounting holes 20, the impeller diameter is 350mm, the hub ratio is 0.4, and the number of blades on the impeller is 4 pieces, the blades are adjusted and fixed by the fixing hole 21; the second impeller 11 has the same structure and size as the first impeller 3; the stator 8 is supported by bearings, and there is a 2mm gap between the stator 8 and the rotor 10; The guide vane body 12 and the rear water guide cone 16 are of an integrated structure, and the structural type is the same as that of the first guide vane body 4 .

As shown in Figure 1, the working principle of a multi-stage tubular pump device with a new structure is as follows: the present invention fixes the rotor with the shaft through bolts, and sets 6 bolts in one circle, for a total of two weeks, 12 bolts, and installs the stator. In the hub, corresponding to the rotor, the distance between the stator and the rotor is 2mm. The winding coils are arranged on both sides of the stator, which are supported in the hub by the bearings on both sides, and the bearings are locked with a snap ring. Both the stator and the rotor are placed in the hub, and the rotor and the bearing are driven to rotate together through the electromagnetic action between the stator and the rotor; the outer part of the hub at the stator and the rotor is connected to the support, and the support is made of 6 straight plates, which play a fixed supporting role , and a wire outlet hole is left on the support to facilitate the power-on of the device; the entire motor part is fixed with the first guide vane body and the second impeller with a flange. The installation of the rotor and the stator eliminates the influence of the gap backflow between the stator and the rotor on the performance of the pump, as well as the increased friction torque of the rotor disc due to the backflow of the gap, which greatly improves the efficiency of the pump device and avoids the welding of the impeller rim and the rotor. , the blade angle can be adjusted, and the structure is further compact, which is convenient for installation and disassembly.

This device is a two-stage pump. One pair of impellers is equipped with 4 blades. There are two pairs of impellers. The impeller diameter is 350mm, and the hub-to-hub ratio is 0.4. The first impeller is integrated with the front water guide cone, and a keyway is reserved in the hub , the key is connected with the shaft, and the impeller and the front water guide cone are fixed; the blade installation hole is reserved at the impeller hub, the blade root and the hub are fixed with countersunk screws and positioning pins, and the first guide vane is arranged at the water outlet of the first impeller. The velocity circulation of the water flow at the outlet of the impeller is recovered; after the second impeller is placed in the motor, it is connected to the shaft with threads, and its blades are installed the same as the first impeller, and are also equipped with a second guide vane. When the motor is energized and working, the motor rotor drives the shaft to rotate together, and then drives the first impeller and the second impeller to rotate through the occlusal force between the keyway and the thread. The configuration of the two-stage axial flow pump can effectively improve the operating head of the pumping station, and can be applied to the pumping station with high head and large flow.

In this device, the pump blade adjustment method adopts semi-adjustment type. The impeller blade shaft is embedded in the installation hole of the hub, and the blade root rests on the positioning step in front of the installation hole. There are three bolt holes in the installation hole, which are fixed by bolts and positioning pins. In the hub body, the blade angle can be adjusted simply by removing the dowel pins and screws.

In the device, guide vanes are arranged behind the two impellers, and the guide vanes are curved guide vanes matched with the impellers. The inside of the hub of the first guide vane body is set in a stepped shape, which is convenient for the installation and fixation of the bearing. There are 4 bearings arranged in it. The bearings are connected with the shaft, so that the guide vane body does not rotate with the shaft. The other side is provided with a positioning step to effectively fix the bearing. The second guide vane body has the same structure as the first guide vane body, and the second guide vane body is integrated with the rear water guide cone. The water flow passes through the first impeller, and the kinetic energy increases. The first guide vane recovers the water circulation at the outlet of the first impeller, and at the same time changes the flow state of the water flow at the inlet of the second impeller, so that the flow energy of the water flowing through the second impeller is further increased. And the efficiency has been significantly improved. Finally, the second guide vane body recovers the water flow circulation and eliminates a part of the residual energy of the water flow, thereby improving the efficiency and head of the pump device. Flanges are used to connect each unit, and rubber pads are arranged between the flanges to ensure the sealing of the device and facilitate the installation and maintenance of the unit.

Claims (8)

1. A multi-stage tubular pump device with a novel structure comprises a pump shell (1) and a shaft (13) arranged inside the pump shell (1); the method is characterized in that: the tubular pump device is also formed by connecting a hub (2), an impeller, a guide vane body, a bearing (5), a rotor (10), a stator (8) and a water guide cone; the rotor (10) forms circumferential connection with the shaft (13) through a rotor locking nut (6) and is fixed, the rotor (10) forms circumferential connection with the shaft (13) through a bearing (10) and is fixed, the stator (8) is fixedly arranged on the inner wall of the stator shell, the stator (8) is sleeved on the outer side of the rotor (10) and forms a gap with the rotor (10), a supporting piece (7) is arranged between the stator shell and the pump shell (1), the left sides of the stator (8) and the rotor (10) are provided with a hub (2), the hub (2) is connected and arranged on the shaft (13) through a bearing (5), a first guide vane body (4) is arranged between the hub (2) and the pump shell (1), a first impeller (3) is arranged on the left side of the first guide vane body (4), a front water guide cone (15) is arranged on the left side of the first impeller (3), the right sides of the rotor (10) and the stator (8) are provided with a second impeller (11), the right side of the second impeller (11) is provided with a second guide vane body (12), and the right side of the second guide vane body (12) is connected with a rear water guide cone (16).

2. The multistage tubular pump device with a novel structure as claimed in claim 1, wherein: the rotor (10) is connected and fixed with the shaft (13) through two rotor locking nuts (6), the number of each rotor locking nut (6) is 6, the rotor locking nuts (6) are uniformly distributed on the outer circle of the shaft (13), the left side and the right side of the rotor (10) are respectively provided with a bearing, and the bearings are fixed through clamping rings.

3. The multistage tubular pump device with a novel structure as claimed in claim 1, wherein: the number of the supporting pieces (7) is 6, the supporting pieces are evenly arranged between the stator shell and the pump shell (1) at intervals, the supporting pieces (7) are straight plates, and one of the supporting pieces (7) is provided with a wire outlet hole (9).

4. The multistage tubular pump device with a novel structure as claimed in claim 1, wherein: be equipped with 7 stator vanes on first guide vane body (4), the stator vane is fixed in wheel hub (2) outside, and wheel hub (2) inside is equipped with 4 bearings (5) with the hub connection, and bearing (5) carry out axial positioning fixedly through location step on right side and left snap ring (5).

5. The multistage tubular pump device with a novel structure as claimed in claim 1, wherein: first impeller (3) and preceding water guide cone (15) set up in the left side of first guide vane body (4), first impeller (3) and preceding water guide cone (15) formula structure as an organic whole, and impeller wheel hub department leaves blade mounting hole (20), is equipped with 3 fixed orificess (21) on mounting hole (20) circumference, and the impeller diameter is 350mm, and the wheel hub ratio is 0.4, and the quantity of blade is 4 on the impeller, and the blade carries out blade angle modulation and fixes through fixed orificess (21).

6. The multistage tubular pump device with a novel structure as claimed in claim 1, wherein: the second impeller (11) and the first impeller (3) are identical in structural size.

7. The multistage tubular pump device with a novel structure as claimed in claim 1, wherein: the stator (8) forms a support through a bearing, and a 2mm gap is formed between the stator (8) and the rotor (10).

8. The multistage tubular pump device with a novel structure as claimed in claim 1, wherein: the second guide vane body (12) and the rear water guide cone (16) are of an integrated structure, and the structural form of the second guide vane body is the same as that of the first guide vane body (4).

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