Centrifugal pump blade adjusting mechanism

Abstract

The utility model relates to the technical field of centrifugal pumps, in particular to a centrifugal pump blade adjusting mechanism. The centrifugal pump comprises a blade disc, a mounting shaft is fixedly connected to the center of the top of the blade disc, a plurality of blades can be adjusted at the same time by arranging an adjusting mechanism, the number of the blades is increased or decreased, in the initial state, first blades and second blades are evenly distributed on the blade disc, the number of the blades is maximum, and the lift of the centrifugal pump is maximum at the moment; when the number of the blades needs to be reduced and lift needs to be reduced, the rotating shaft is rotated to enable the front ends of the second blades to slide in the moving grooves through the groove holes, the multiple second blades are driven to rotate to be attached to the first blades, the second blades are folded, the number of the blades is reduced, the effect of adjusting the multiple blades at the same time is achieved, the number of the blades is conveniently changed, and the adjusting time is shortened. The thickness of the first blade is increased while the number of the blades is reduced, and compared with two independent thin blades, the combined thick blade has higher strength and rigidity.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pumps, and specifically, to a blade adjusting mechanism for a centrifugal pump. Background Technique

[0002] A centrifugal pump is a pump that uses the centrifugal force generated by the rotation of an impeller to transport liquids. During use, the number of blades can be adjusted as needed to change the head of the centrifugal pump.

[0003] Regarding the adjusting mechanism, there are many existing technologies, for example:

[0004] Chinese Patent Application No. CN213711416U discloses a centrifugal pump impeller structure, including a fixed disk and multiple blades. An annular plate is fixedly connected to the outer wall of the fixed disk. An annular groove is provided on the outer wall of the annular plate. Elastic sliding blocks are circumferentially and equidistantly slidably connected to the inner wall of the annular groove. One ends of the multiple elastic sliding blocks are fixedly connected with blades. A groove is provided at the other end of the elastic sliding block. An elastic mechanism is arranged inside the groove. A plug post is arranged at the bottom of the elastic mechanism. Elastic pressing posts are fixedly arranged on both sides of the outer wall of the plug post. One end of the elastic pressing post is connected with a socket; the utility model is convenient for installing the blades, can appropriately increase or decrease the number of blades, adjust the gap between the blades, has a reasonable design, can flexibly adjust the angles of multiple blades, has a low cost, and is suitable for popularization.

[0005] However, when the existing device adjusts the blades, it is inconvenient to adjust multiple blades simultaneously, resulting in cumbersome operations when adjusting the number and affecting production efficiency. In view of this, we propose a blade adjusting mechanism for a centrifugal pump. Content of the Utility Model

[0006] The purpose of the utility model is to solve the above-mentioned disadvantages and provide a blade adjusting mechanism for a centrifugal pump;

[0007] To achieve the above purpose, the utility model provides a blade adjusting mechanism for a centrifugal pump, including a blade disc. A mounting shaft is fixedly connected to the center of the top of the blade disc. A first blade is fixedly connected to the outer wall of the mounting shaft. A rotating shaft is rotatably connected to the inside of the mounting shaft. A second blade is fixedly connected to the outer wall of the rotating shaft. The front end of the second blade extends out of the inside of the mounting shaft and is located at the same horizontal position as the first blade. By rotating the rotating shaft, the second blade rotates to fit the first blade, and the second blade is retracted.

[0008] As a further improvement of this technical solution, a moving groove is opened on the outer wall of the mounting shaft, and a slot hole is opened between the second blade and the rotating shaft. The moving groove and the slot hole are slidably adapted to enable the second blade to extend out of the inside of the mounting shaft.

[0009] As a further improvement of the technical solution, first screws are threadedly connected to the outer walls of the second blade and the first blade near the ends, and the ends of the first screws are adapted to the screw holes formed on the surface of the disk.

[0010] As a further improvement of the technical solution, second screws are threadedly connected to the side walls of the first blade and the second blade near the ends, and the ends of the second screws are adapted to the screw holes formed on the side walls of the first blade and the second blade.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] In the centrifugal pump blade adjusting mechanism, by setting the adjusting mechanism, multiple blades can be adjusted simultaneously to increase or decrease the number of blades. In the initial state, the first blade and the second blade are evenly distributed on the disk. At this time, the number of blades is the largest and the head of the centrifugal pump is the highest. When the head requirement is not high and the number of blades needs to be reduced to lower the head, rotate the rotating shaft so that the front end of the second blade slides through the slot hole in the moving slot, driving multiple second blades to rotate and fit against the first blade, folding up the second blades, reducing the number of blades, achieving the effect of adjusting multiple blades simultaneously, conveniently changing the number of blades, being beneficial to shortening the adjustment time. While the blades are reduced, the thickness of the first blade is increased. Compared with two separate thin blades, the combined thick blade has higher strength and stiffness. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0014] Figure 2 is a schematic diagram of the retracted structure of the adjusting mechanism of the present utility model;

[0015] Figure 3 is a schematic diagram of the exploded structure of the present utility model;

[0016] Figure 4 is a schematic diagram of the sectional structure of the installation shaft of the present utility model.

[0017] The meanings of the various reference numerals in the figure are as follows:

[0018] 1, disk;

[0019] 2, installation shaft; 21, rotating shaft; 22, first blade; 23, second blade; 230, slot hole; 24, moving slot; 25, second screw; 26, second screw. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0021] A centrifugal pump is a pump that uses the centrifugal force generated by the rotation of an impeller to transport liquids. During use, the number of blades can be adjusted as needed to change the head of the centrifugal pump. Please refer to Figures 1 - 4 As shown, this embodiment provides a centrifugal pump blade adjustment mechanism, including a blade disc 1. A mounting shaft 2 is fixedly connected to the center of the top of the blade disc 1. A first blade 22 is fixedly connected to the outer wall of the mounting shaft 2. A rotating shaft 21 is rotatably connected inside the mounting shaft 2. A second blade 23 is fixedly connected to the outer wall of the rotating shaft 21. The front end of the second blade 23 extends out of the inside of the mounting shaft 2 and is located at the same horizontal position as the first blade 22. By rotating the rotating shaft 21, the second blade 23 is rotated to fit the first blade 22, and the second blade 23 is retracted.

[0022] The improvement in this embodiment lies in that: in the initial state, the first blade 22 and the second blade 23 are evenly distributed on the blade disc 1. At this time, the number of blades is the largest and the head of the centrifugal pump is the largest. When the requirement for the head is not high and the head needs to be reduced, by rotating the rotating shaft 21, the front end of the second blade 23 slides in the moving groove 24 through the slot hole 230, and at the same time drives a plurality of second blades 23 to rotate to fit the first blade 22, retracting the second blade 23. The number of blades becomes smaller and the head is reduced, achieving the effect of adjusting multiple blades at the same time, reducing the number of blades, and at the same time increasing the thickness of the first blade 22. Compared with two separate thin blades, the combined thick blade has higher strength and stiffness.

[0023] Since the front ends of the first blade 22 and the second blade 23 need to extend out of the inside of the mounting shaft 2, therefore, as Figure 1 、 Figure 2 and Figure 4 shown, a moving groove 24 is provided on the outer wall of the mounting shaft 2, and a slot hole 230 is provided between the second blade 23 and the rotating shaft 21. The moving groove 24 and the slot hole 230 are slidably adapted to enable the second blade 23 to extend out of the inside of the mounting shaft 2. By providing the moving groove 24, the second blade 23 extends out of the mounting shaft 2. The front end of the second blade 23 slides in the moving groove 24 through the slot hole 230, so that one side of the second blade 23 fits the first blade 22, retracting the second blade 23, reducing the number of blades, and reducing the head of the centrifugal pump, which is beneficial to energy conservation.

[0024] Since the blade needs to be fixed to the disk 1 to make the blade more stable during rotation, as Figure 1 and Figure 2 shown, the outer walls of the second blade 23 and the first blade 22 near the ends are both threadedly connected with first screws 25. The ends of the first screws 25 are adapted to the screw holes formed on the surface of the disk 1. By installing the first screws 25 into the corresponding screw holes, the blade is fixed to the disk 1, preventing the blade from flying out during high-speed rotation and injuring personnel or equipment.

[0025] Considering that when the second blade 23 is retracted, the connection between the two mating blades is not firm, as Figures 1 - 4 shown, the side walls of the first blade 22 and the second blade 23 near the ends are threadedly connected with second screws 26. The ends of the second screws 26 are adapted to the screw holes formed on the side walls of the first blade 22 and the second blade 23. When the second blade 23 rotates to fit the first blade 22, by installing the second screws 26 into the corresponding screw holes, the first blade 22 and the second blade 23 are fixed, making the connection between the blades tighter and preventing the blades from shaking during high-speed rotation, which may affect the operation of the equipment.

[0026] When the blade adjustment mechanism of the centrifugal pump of the present utility model is specifically used, during use, the pump shaft at the bottom of the disk 1 is connected to the motor through a coupling. The motor drives the pump shaft to rotate, driving the disk 1 to rotate, thereby rotating the blade to convey liquid. In the initial state, the second blade 23 and the first blade 22 are evenly distributed on the disk 1, with the largest number of blades and the highest head of the centrifugal pump. Since too high a head will cause the centrifugal pump to consume too much energy during operation, when it is necessary to reduce the number of blades to lower the head, rotate the rotating shaft 21 so that the front end of the second blade 23 slides in the moving groove 24 through the slot hole 230, driving a plurality of second blades 23 to rotate and fit the first blade 22, retracting the second blade 23, reducing the number of blades, achieving the effect of simultaneously adjusting multiple blades, conveniently changing the number of blades, which is beneficial to shortening the adjustment time. At the same time, the thickness of the first blade 22 is increased. Compared with two separate thin blades, the combined thick blade has higher strength and stiffness. During the operation of the centrifugal pump, the thick blade can better resist the acting force of the fluid and the centrifugal force, reducing the risk of blade deformation and damage, ensuring that it is not easily deformed or damaged during operation. During the installation and adjustment process, the blade is fixed to the disk 1 by installing the first screws 25 into the corresponding screw holes, preventing the blade from flying out during high-speed rotation and injuring personnel or equipment. Then, the second screws 26 are installed into the corresponding screw holes to fix the first blade 22 and the second blade 23, making the connection between the blades tighter and preventing the blades from shaking during high-speed rotation, which may affect the operation of the equipment. Installing and fixing the mechanism by screws instead of the traditional welding method is convenient for disassembly and adjustment.

[0027] The foregoing has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments, and the above embodiments and the descriptions in the specification are only preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A centrifugal pump vane adjusting mechanism, including a vane disc (1), characterized in that: A mounting shaft (2) is fixedly connected to the center of the top of the blisk (1). A first blade (22) is fixedly connected to the outer wall of the mounting shaft (2). A rotating shaft (21) is rotatably connected inside the mounting shaft (2). A second blade (23) is fixedly connected to the outer wall of the rotating shaft (21). The front end of the second blade (23) extends out of the inside of the mounting shaft (2) and is located at the same horizontal position as the first blade (22). By rotating the rotating shaft (21), the second blade (23) is rotated to fit the first blade (22), and the second blade (23) is retracted.

2. The centrifugal pump vane adjusting mechanism according to claim 1, characterized in that: A moving groove (24) is formed in the outer wall of the mounting shaft (2). A slot hole (230) is formed between the second blade (23) and the rotating shaft (21). The moving groove (24) is slidably fitted with the slot hole (230) for the second blade (23) to extend out of the inside of the mounting shaft (2).

3. The centrifugal pump vane adjusting mechanism according to claim 1, characterized in that: First screws (25) are threadedly connected to the outer walls of the second blade (23) and the first blade (22) near the ends. The ends of the first screws (25) are adapted to the screw holes formed on the surface of the blisk (1).

4. The centrifugal pump vane adjusting mechanism according to claim 1, characterized in that: Second screws (26) are threadedly connected to the side walls of the first blade (22) and the second blade (23) near the ends. The ends of the second screws (26) are adapted to the screw holes formed on the side walls of the first blade (22) and the second blade (23). When the second blade (23) is rotated to fit the first blade (22).

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