CN110242578B

CN110242578B - Axial flow pump blade angle adjusting device and axial flow pump

Info

Publication number: CN110242578B
Application number: CN201910645767.2A
Authority: CN
Inventors: 牛连永; 吕鸿彬
Original assignee: Andritz China Ltd
Current assignee: Andritz China Ltd
Priority date: 2019-07-17
Filing date: 2019-07-17
Publication date: 2024-04-09
Anticipated expiration: 2039-07-17
Also published as: CN110242578A

Abstract

The invention relates to an axial flow pump blade angle adjusting device, which comprises a piston, a piston rod and blades (1). The axial flow pump blade angle adjusting device comprises: a rotating arm (2) fixedly connected to the vane (1), a sliding ring (5) configured to be adapted to move up and down in an axial direction by a piston rod of the axial flow pump; a plurality of parallel links (13) arranged at the outer periphery of the sliding ring (5), one end of each parallel link (13) being pivotably fixed to the inner side face of the impeller hub (3) of the axial flow pump, and the other end being pivotably connected to the radial outer periphery of the sliding ring (5); and a plug link (14) having one end pivotally connected between the two ends of the parallel links and the other end pivotally connected to the swivel arm (2). The invention also relates to an axial flow pump with the axial flow pump blade angle adjusting device.

Description

Axial flow pump blade angle adjusting device and axial flow pump

Technical Field

The invention relates to an axial flow pump blade angle adjusting device. The invention also relates to an axial flow pump with the axial flow pump blade angle adjusting device.

Background

The large axial flow pump is a general machine, and has the advantages of large flow, low lift, wide application, large-area agricultural irrigation and drainage, urban drainage, transportation of circulating water of thermal power stations with large cooling water requirement, dock lifting water level and the like.

The axial flow pump has the characteristics of large flow, simple structure, light weight and small external dimension. The axial flow pump is tubular in shape, so that the floor space is small.

The axial flow pump can be divided into three types of vertical type, inclined type and horizontal type according to the installation position of the pump shaft. Only the pump body forms are different, and the internal structures are basically the same. More of China is a vertical axial flow pump. The impeller is immersed in water when the vertical axial flow pump works, the pump does not need to be irrigated when the vertical axial flow pump is started, and the operation is simple and convenient.

For an adjustable axial flow pump, when the working conditions are changed, the blades can be adjusted by changing the angles of the blades. The adjustable axial flow pump is classified into a half-adjustable type and a full-adjustable type. The semi-adjustable blade is detachable, and the angle is changed by manually adjusting the blade to be loosened. The angle of the blades is automatically changed through a set of special follow-up mechanism, most of the blades of the large axial flow pump are of a full-adjustment type, and full adjustment of the blades can be realized under the condition of no shutdown.

The conventional axial flow pump blade angle adjusting device is shown in fig. 1: the piston 30 is driven by the pressure difference between the upper oil chamber and the lower oil chamber of the oil cylinder 31, and the piston 30 is connected with the piston rod 33 to drive the operating frame 32 to move up and down along the axial direction. Further, as is clear from the sectional view taken along A-A in fig. 1, the operating frame 32 is fixed with an ear 36, the link 34 connects the ear 36 and the lever 35, and the lever 35 drives the vane 37, thereby changing the axial movement of the piston 30 into an angular change of the vane 37.

This solution has the following problems: first, the lower operating frame 32 drives the blades through the connecting rods 34, and the force required for adjusting the blades is directly transmitted back to the oil cylinder 31 through the single-connecting-rod drive, so that the pressure in the oil cylinder 31 is high, and thus the oil supply station and the oil delivery pipe system are also high in pressure. Second, errors in the linkage transmission process eventually lead to angular adjustment errors of the vanes 37, thereby affecting hydraulic efficiency and radial force. In addition, since the connecting space between the crank arm 35 and the connecting rod 34 is short, the angle of the blade 37 cannot be accurately adjusted, and the connecting rod 34 and the crank arm 35 are easy to be blocked, so that the adjusting structure cannot work.

Therefore, it is desirable to provide a more reasonable axial flow pump blade angle adjusting device, which can prevent the clamping in the adjusting process, realize the accurate control of the angle, and reduce the pressure in the oil supply system, so as to realize the smoother and smoother axial flow pump blade angle adjustment.

Disclosure of Invention

In order to solve the technical problems, the invention provides an axial flow pump blade angle adjusting device, which solves the problems of low angle adjusting precision of a large axial flow pump blade, clamping of a blade and a connecting rod, high oil supply pressure of a hydraulic oil station and high cost.

The invention provides an axial flow pump blade angle adjusting device, which is provided with a piston, a piston rod and blades, and comprises: the axial flow pump blade angle adjusting device comprises: a sliding ring configured to be adapted to move up and down in an axial direction by a piston rod of the axial flow pump; and a rotary arm, a parallel link and a plug link correspondingly arranged for each blade, wherein the rotary arms are respectively and fixedly connected to the corresponding blades, one end of each parallel link is pivotally fixed on the inner side surface of an impeller hub of the axial flow pump, the other end of each parallel link is pivotally connected with the radial periphery of the sliding ring, one end of each plug link is pivotally connected between two ends of the corresponding parallel link, and the other end of each plug link is pivotally connected with the corresponding rotary arm.

The axial flow pump blade angle adjusting device has the advantages that the lever type structure formed by the parallel connecting rod and the plug connecting rod can reduce the driving force required by the rotating blade to be one half of the original driving force, the pressure required by the driving oil cylinder is greatly reduced, and the cost of hydraulic control components required by an oil station is also reduced.

Preferably, the parallel links are pivotally connected to the radially outer periphery of the slip ring, to the plug links and to the inner side of the impeller hub, for example by means of ball-and-socket bearings.

It is further preferred that the eccentric pin is coupled to the ball joint bearing. For example, the parallel links may be connected by means of spherical ball joints to eccentric pins mounted on the radial outer periphery of the slip ring. Similarly, the parallel links may also be connected to eccentric pins fixed to the inner side of the impeller hub by means of spherical knuckle bearings. The eccentric pin has the advantages that the eccentric pin is used for compensating the machining errors of parts, reducing the angle errors of the blades, reducing the hydraulic errors and ensuring the efficient and stable operation.

In a preferred embodiment of the axial pump blade angle adjustment device according to the invention, the lower part of the impeller cover plate of the axial pump is located radially inwards of the sliding ring and the upper part is connected fixedly to the impeller hub. In this way, the whole axial flow pump blade angle adjusting device is encapsulated below the impeller cover plate, so that a compact structure is formed, and the hub space is saved. In addition, the sliding ring is sleeved outside the impeller cover plate under the implementation mode, so that stable and smooth sliding can be realized.

According to a preferred embodiment of the axial flow pump blade angle adjusting device provided by the invention, the side surface of the impeller hub is provided with a plurality of blade holes, and the blades are arranged in the blade holes and are connected with the rotating arm in the impeller hub through bolts. Rotation of the rotating arm drives the blades to rotate by corresponding angles.

The invention also provides an axial flow pump which comprises the axial flow pump blade angle adjusting device.

Drawings

FIG. 1 illustrates a conventional axial flow pump vane angle adjustment device of the prior art;

FIG. 1A is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 2 schematically illustrates an axial flow pump blade angle adjustment device according to the present invention in a cutaway perspective view;

FIG. 3 schematically illustrates in perspective view the connection of the various component parts of the axial flow pump blade angle adjustment device according to the present invention;

fig. 4 shows schematically in a top view an axial flow pump blade angle adjustment device according to the invention.

Detailed Description

The axial flow pump blade angle adjusting device and the axial flow pump according to the present invention will be described in detail with reference to the accompanying drawings and examples.

Fig. 2 shows schematically in a sectional perspective view an axial flow pump blade angle adjustment device according to the invention. For clarity, the blade cover is shown in exploded form. As shown in the drawings, the axial flow pump blade angle adjusting device according to the present invention includes: a sliding ring 5 configured to be adapted to move up and down in an axial direction by being driven by a piston rod of the axial flow pump; and a swivel arm 2, a parallel link 13, and a plug link 14 which are provided for each blade 1. Wherein, the rotating arms are respectively and fixedly connected to the corresponding blades 1, one end of the parallel connecting rod 13 is pivotally fixed to the inner side surface of the impeller hub 3 of the axial flow pump, the other end is pivotally connected to the radial periphery of the sliding ring 5, one end of the plug connecting rod is pivotally connected between the two ends of the corresponding parallel connecting rod, and the other end is pivotally connected to the corresponding rotating arm 2. In this way, a force transmission path is provided for each blade, which path is formed by the swivel arm 2, the plug link 14, the parallel link 13 and the sliding ring 5. The piston and the piston rod drive the sliding ring 5 to move up and down axially, and the movement is converted into accurate rotation of the blade 1.

As shown in the figure, the lower part of the impeller cover plate 4 of the axial flow pump is positioned radially inside the sliding ring, while the upper part is fixedly connected with the impeller hub 3. The radial sleeve arrangement improves the stability of the movement of the sliding ring 5 and also enables a compact arrangement of the blade angle adjusting device in the impeller hub.

The side of the impeller hub 3 is provided with a plurality of blade holes, the blades 1 are arranged in the blade holes, and the blades are connected with the rotating arm 2 in the impeller hub 3 through bolts. In this way, the rotation of the rotor arm 2 can be accurately converted into the rotation of the blade 1.

Fig. 3 schematically illustrates in perspective view the connection relationship of the constituent parts of the axial flow pump blade angle adjusting device according to the present invention. Corresponding to each blade, the rotating arm 2, the plug connecting rod 14 and the parallel connecting rod 13 are correspondingly arranged and finally connected with the sliding ring 2, and the rotating arm 2, the plug connecting rod and the parallel connecting rod form a labor-saving lever together, so that the driving force required by the rotating blade 1 can be reduced to about one half of the driving force, the pressure required by a driving oil cylinder can be greatly reduced, the cost of hydraulic control components required by an oil station is reduced, and the inherent structural problem of easy blocking in the traditional ejector rod structure is also overcome by the labor-saving lever structure.

Fig. 4 shows schematically in a top view an axial flow pump blade angle adjustment device according to the invention. As shown in fig. 4, in the axial flow pump blade angle adjustment device provided by the present invention, there is exemplified an axial flow pump blade angle adjustment device correspondingly provided to five blades. The parallel connecting rod 13 is connected with the radial outer periphery of the sliding ring 5, the plug connecting rod and the inner side surface of the impeller hub through joint bearings. Furthermore, the connection of the parallel link 13 on the radial outer circumference of the sliding ring 5 and on the inner side of the impeller hub is achieved by eccentric pins 16 and 11, respectively. The provided eccentric pins 11, 16 respectively compensate the machining errors of parts, and simultaneously can reduce the mutual angle errors of the blades, thereby reducing the hydraulic errors and ensuring the efficient and stable operation.

The plug link 14 and the parallel link 13 may be connected by a ball joint and a concentric pin, or by a ball joint and an eccentric pin. 15 in the embodiment shown in fig. 4 is a concentric pin.

In this embodiment, since the axial flow pump blade angle adjusting device of the present invention is used instead of the conventional axial flow pump blade angle adjusting device, the tensile force for detecting the rotation of the driving blade is reduced from 2100kg to 900kg, and the cylinder oil supply station pressure is also reduced by about 1/2, so that the advantages of the present invention are very obvious.

The foregoing describes preferred embodiments of the invention, but the spirit and scope of the invention is not limited to the specific disclosure herein. Those skilled in the art can make any combination and extension of the above embodiments according to the teachings of the present invention to make further embodiments and applications within the spirit and scope of the present invention. The spirit and scope of the present invention are not limited by the specific embodiments, but by the appended claims.

Claims

1. An axial flow pump blade angle adjusting device, the axial flow pump has a piston, a piston rod, a blade (1), characterized in that the axial flow pump blade angle adjusting device comprises:

a sliding ring (5) configured to be adapted to move up and down in an axial direction by being driven by a piston rod of the axial flow pump; and

a rotating arm (2), a parallel connecting rod (13) and a plug connecting rod (14) are correspondingly arranged for each blade (1), wherein the rotating arms are respectively and fixedly connected to the corresponding blades (1), one end of the parallel connecting rod (13) is pivotally fixed to the inner side surface of an impeller hub (3) of the axial flow pump, the other end of the parallel connecting rod is pivotally connected with the radial periphery of the sliding ring (5), one end of the plug connecting rod is pivotally connected between two ends of the corresponding parallel connecting rod, and the other end of the plug connecting rod is pivotally connected with the corresponding rotating arm (2).

2. The axial flow pump blade angle adjustment device according to claim 1, characterized in that the parallel link (13) is connected to the radial outer periphery of the sliding ring (5) by means of a spherical knuckle bearing.

3. The axial flow pump blade angle adjustment device according to claim 1, characterized in that the parallel link (13) and the plug link (14) are connected by means of a spherical plain bearing.

4. The axial flow pump blade angle adjustment device according to claim 1, characterized in that the parallel link (13) is connected with the inner side of the impeller hub (3) by means of a spherical knuckle bearing.

5. The axial flow pump blade angle adjustment device according to claim 2, characterized in that the parallel link (13) is connected with an eccentric pin mounted on the radial outer circumference of the sliding ring (5) by means of a spherical knuckle bearing.

6. The axial flow pump blade angle adjustment device according to claim 4, characterized in that the parallel link (13) is connected to an eccentric pin fixed to the inner side of the impeller hub (3) by means of a spherical knuckle bearing.

7. The axial flow pump blade angle adjustment device according to any one of claims 1 to 6, characterized in that the lower part of the impeller cover plate (4) of the axial flow pump is located radially inside the sliding ring (5) and the upper part is fixedly connected with the impeller hub (3).

8. The axial flow pump blade angle adjustment device according to any one of claims 1 to 6, characterized in that the impeller hub (3) is provided with a number of blade holes on its side, in which blade holes the blades (1) are mounted and in the impeller hub (3) are bolted to the swivel arm (2).

9. The axial flow pump blade angle adjustment device according to any one of claims 1 to 6, the parallel links being evenly spaced on the outer circumference of the slip ring (5).

10. An axial flow pump comprising the axial flow pump blade angle adjustment device of any one of claims 1 to 9.