Back vane rotary vane type impeller for self-suction centrifugal pump

Abstract

The back vane rotary vane type impeller for the self-suction centrifugal pump comprises an impeller body, guide rails are symmetrically arranged on the front side and the rear side of an inner cavity of the impeller body, one end of a guide block is embedded in an inner cavity of each guide rail, the other end of each guide block extends out of the corresponding guide rail and is provided with a connecting ring, and teeth are arranged on the circumference of the inner wall of each connecting ring. A handle is installed at the bottom end of the connecting ring, and first fixing holes are formed in the bottom end of the impeller from left to right. The device is simple in structure and reasonable in design, the angle of the blades can be accurately adjusted to be optimal according to actual use requirements in a synchronous transmission mode, the flowing path of fluid in the impeller is optimized, impact loss and vortex are reduced, the pump body can easily cope with different working scenes, in addition, the blades can be effectively protected and prevented from being abraded, and the service life of the pump body is prolonged. And the working efficiency of the pump body is improved, the overall service life is prolonged, the use is flexible, the practicability is high, and the use requirements on the existing market are met.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump technology, specifically to a back-blade rotary vane impeller for a self-priming centrifugal pump. Background Technology

[0002] In industrial production and daily life, self-priming centrifugal pumps are widely used in agricultural irrigation, urban water supply and drainage, chemical production, oil transportation, and many other fields because they can draw liquids without the need for additional priming. The back-blade rotary vane impeller, as the core component of a self-priming centrifugal pump, directly determines the pump's efficiency and reliability.

[0003] Currently, traditional self-priming centrifugal pumps use back-blade rotary vane impellers, where the blades are typically fixed to the impeller hub with no adjustable blade angle. This results in poor adaptability of the impeller to different operating conditions. For example, in agricultural irrigation, different seasons and crops have different requirements for irrigation water volume and pressure, and impellers with fixed blade angles cannot be flexibly adjusted, making it difficult to maintain efficient operation under various irrigation needs. In chemical production, the characteristics of the transported media (such as viscosity and density) vary greatly, and the requirements for flow rate and head in the production process often change. Fixed-angle blades cannot be optimized for these complex and variable situations, which not only leads to energy waste but may also affect production progress due to failure to meet process requirements. In addition, when centrifugal pumps transport media containing particulate impurities or corrosive media, the surface of traditional impeller blades is easily worn. Due to the lack of effective wear protection and convenient repair methods, once the blades wear out, the entire impeller often needs to be replaced. This not only significantly increases maintenance costs but also leads to long downtime, seriously affecting production continuity.

[0004] In summary, existing self-priming centrifugal pumps with back-blade rotary vanes have many shortcomings in terms of adaptability to working conditions, operating efficiency, equipment life and operational stability due to fixed blade angles and lack of wear-resistant and convenient maintenance structures. Utility Model Content

[0005] The purpose of this invention is to provide a back-blade rotary vane impeller for a self-priming centrifugal pump to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a back-blade rotary vane impeller for a self-priming centrifugal pump, comprising an impeller, with guide rails symmetrically arranged on both the front and rear sides of the impeller's inner cavity. One end of a guide block is embedded within the inner cavity of each guide rail, and the other end of the guide block extends out of the guide rail and is fitted with a connecting ring. Teeth are provided on the circumference of the inner wall of the connecting ring. A handle is installed at the bottom end of the connecting ring. A first fixing hole is formed from left to right at the bottom end of the impeller. One end of a first bolt is threaded onto the outer wall of the handle. The other end of the first bolt passes through the handle and is screwed into the inner cavity of the first fixing hole. The first fixing hole and... The first bolts are threaded together. The impeller has second fixing holes on both the left and right sides of its bottom end. The bottom end of the impeller is fitted with a first sealing cover. One end of a second bolt is threaded onto the outer wall of the first sealing cover. The other end of the second bolt passes through the first sealing cover and is screwed into the inner cavity of the second fixing hole. The second fixing hole and the second bolt are threaded together. The bottom circumference of the inner cavity of the impeller is rotatably connected to one end of a connecting column through a bearing. The other end of the connecting column extends out of the outer wall of the impeller and is fitted with blades. Gears are installed on the outer wall of the connecting column, and the gears mesh with each other.

[0007] Preferably, a sealing ring is provided on the outer wall of the connecting column, and the sealing ring is located at the connection between the connecting column and the impeller.

[0008] Preferably, a wear-resistant coating block is fitted on the outer wall of the blade, and one end of a third bolt is threadedly connected to the top of the wear-resistant coating block. The other end of the third bolt passes through the wear-resistant coating block and is screwed into the inner cavity of the blade. The third bolt and the blade are threadedly connected to each other, and a second sealing cap is installed on the top of the wear-resistant coating block.

[0009] Preferably, the guide block is positioned at the exact center of the guide rail.

[0010] Preferably, the teeth and gears are matched and their positions correspond.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: This self-priming centrifugal pump uses a back-blade rotary vane impeller. The sealing cover can be disassembled and assembled through the cooperation between the second bolt and the second fixing hole. The handle position can be locked and fixed through the cooperation between the first bolt and the first fixing hole. By pushing the handle, the connecting ring, teeth, and guide block can be rotated clockwise or counterclockwise. During this process, the teeth will move multiple gears to cause the connecting column to drive the blades to rotate, thereby adjusting the blade tilt angle. The wear-resistant coating block can be disassembled and assembled through the third bolt. The wear-resistant coating block can protect the blades. The device has a simple structure and reasonable design. It adopts a synchronous transmission method to accurately adjust the blade angle to the optimal value according to actual use requirements, optimize the fluid flow path in the impeller, reduce impact loss and eddies, and enable the pump body to easily cope with different working scenarios. In addition, it can also effectively protect the blades, prevent wear, facilitate maintenance, improve the working efficiency of the pump body and extend the overall service life. It is flexible in use, highly practical, and meets the use needs of the current market. Attached Figure Description

[0012] Figure 1 This is a top view of the present invention;

[0013] Figure 2 This is a top view of the connecting ring of this utility model;

[0014] Figure 3 This is a top view of the handle of this utility model;

[0015] Figure 4 This is a bottom view of the first sealing cover of this utility model;

[0016] Figure 5 This is a schematic diagram of the connecting column structure of this utility model;

[0017] Figure 6 This is a schematic diagram of the wear-resistant coating block structure of this utility model.

[0018] In the diagram: 1. Impeller, 2. Guide rail, 3. Guide block, 4. Connecting ring, 5. Tooth, 6. Handle, 7. First fixing hole, 8. First bolt, 9. Second fixing hole, 10. First sealing cover, 11. Second bolt, 12. Connecting column, 13. Blade, 14. Gear, 15. Sealing ring, 16. Wear-resistant coating block, 17. Third bolt, 18. Second sealing cover. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-6 This utility model provides a technical solution: a back-blade rotary vane impeller for a self-priming centrifugal pump, comprising an impeller 1. Guide rails 2 are symmetrically arranged on both the front and rear sides of the inner cavity of the impeller 1. One end of a guide block 3 is embedded in the inner cavity of the guide rail 2. The other end of the guide block 3 extends out of the guide rail 2 and is fitted with a connecting ring 4. Teeth 5 are arranged on the circumference of the inner wall of the connecting ring 4. A handle 6 is installed at the bottom end of the connecting ring 4. First fixing holes 7 are formed from left to right at the bottom end of the impeller 1. One end of a first bolt 8 is threaded onto the outer wall of the handle 6. The other end of the first bolt 8 passes through the handle 6 and is screwed into the inner cavity of the first fixing hole 7. The first fixing hole 7 and the first bolt 8 are screwed together. The impeller 1 has a threaded connection. The bottom of the impeller 1 has two second fixing holes 9 on both the left and right sides. The bottom of the impeller 1 is fitted with a first sealing cover 10. The outer wall of the first sealing cover 10 is threaded with one end of a second bolt 11. The other end of the second bolt 11 passes through the first sealing cover 10 and is screwed into the inner cavity of the second fixing hole 9. The second fixing hole 9 and the second bolt 11 are threadedly connected to each other. The bottom circumference of the inner cavity of the impeller 1 is rotatably connected to one end of a connecting column 12 through a bearing. The other end of the connecting column 12 extends out of the outer wall of the impeller 1 and is fitted with a blade 13. A gear 14 is installed on the outer wall of the connecting column 12. The gear 14 and the teeth 5 are meshed with each other.

[0021] As a preferred option, a sealing ring 15 is provided on the outer wall of the connecting column 12, and the sealing ring 15 is located at the connection between the connecting column 12 and the impeller 1. The sealing ring 15 can improve the sealing performance of the connection.

[0022] As a preferred embodiment, a wear-resistant coating block 16 is fitted on the outer wall of the blade 13. The top end of the wear-resistant coating block 16 is threadedly connected to one end of a third bolt 17. The other end of the third bolt 17 passes through the wear-resistant coating block 16 and is screwed into the inner cavity of the blade 13. The third bolt 17 and the blade 13 are threadedly connected to each other. A second sealing cap 18 is installed on the top end of the wear-resistant coating block 16. The blade 13 can be protected by the wear-resistant coating block 16.

[0023] As a preferred option, the guide block 3 is positioned at the exact center of the guide rail 2.

[0024] As a preferred option, the teeth 5 and gear 14 are matched and positioned accordingly.

[0025] Its detailed connection method is a well-known technology in this field. The following mainly introduces the working principle and process, and the specific work is as follows.

[0026] In use, loosen the second bolt 11, remove the sealing cover 10, and then loosen the first bolt 8. Push the handle 6 to the left or right. The handle 6 will drive the connecting ring 4, the teeth 5, and the guide block 3 to rotate clockwise or counterclockwise together. During this process, the teeth 5 will move the gear 14, causing the connecting column 12 and the blade 13 to rotate clockwise or counterclockwise together. The tilt angle of the blade 13 can be adjusted according to the usage requirements. When the angle is rotated to the appropriate position, stop pushing the handle 6 and tighten the first bolt 8 in the corresponding first fixing hole 7, thereby fixing the position of the handle 6 and the blade 13. Finally, put the sealing cover 10 back in place and tighten the second bolt 11, thereby fixing the position of the sealing cover 10. This completes the operation of adjusting the angle of the blade 13. When it is necessary to disassemble and assemble the wear-resistant coating block 16, simply open the second sealing cover 18 and loosen the third bolt 17. The wear-resistant coating block 16 can then be freely disassembled and assembled.

[0027] The specific beneficial effects of this device are as follows:

[0028] 1. Significantly Enhanced Adaptability: The self-priming centrifugal pump allows for easy adjustment of all blade angles via a synchronous adjustment component, enabling it to readily adapt to various working conditions. In agricultural irrigation, the blade angles can be flexibly adjusted according to seasonal changes and varying water volume and pressure requirements at different crop growth stages, ensuring efficient irrigation. In chemical production, the blade angles can be adjusted promptly to address differences in the characteristics of the transported medium (such as viscosity and density) and frequent changes in flow rate and head due to process variations, maintaining optimal pump performance and significantly improving its adaptability to complex and changing conditions, thus reducing production delays caused by incompatible operating conditions.

[0029] 2. Significantly Improved Operating Efficiency: Under different operating conditions, the blade angle can be adjusted to the optimal state according to actual needs, optimizing the fluid flow path inside the impeller and reducing impact losses and vortex phenomena. When a large flow rate is required, the blade angle is increased to increase the flow rate; when a high head operation is required, the blade angle is decreased to increase the head. This precise adjustment enables the centrifugal pump to maintain high hydraulic efficiency under various operating conditions, effectively reducing energy consumption, achieving energy-saving operation, and saving enterprises a significant amount of operating costs.

[0030] 3. Effectively Extends Equipment Lifespan: Because the blade angle can be adjusted according to operating conditions, the fluid flow inside the impeller is smoother, reducing abnormal impact and wear on the blades. Furthermore, the wear-resistant coating effectively protects the blades, preventing localized stress concentration and excessive wear caused by improper blade angles during centrifugal pump operation, significantly extending the blade's service life. As a key component of the impeller, the extended lifespan of the blades leads to a substantial increase in the overall lifespan of the impeller and even the centrifugal pump, reducing equipment maintenance and replacement frequency and lowering maintenance costs.

[0031] 4. Enhanced operational stability: Optimized blade angles improve the force balance during impeller rotation, reducing pump vibration and noise caused by uneven fluid flow. Stable operation not only improves the comfort of the working environment but also reduces the risk of equipment failure due to vibration, ensuring the stability and reliability of the centrifugal pump during long-term operation. It is especially suitable for places with strict requirements on noise levels and high equipment stability, such as hospitals and precision instrument manufacturing workshops.

[0032] In the description of this utility model, it should be understood that the terms "coaxial," "bottom," "one end," "top," "center position," "other end," "upper," "side," "top," "inner," "front," "center," and "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. At the same time, unless otherwise explicitly specified and limited, the terms "clamping," "plugging," "welding," "installation," "setting," "interference fit," "screw connection," and "pin connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction relationship between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A back-blade rotary vane impeller for a self-priming centrifugal pump, comprising an impeller (1), characterized in that: The impeller (1) has guide rails (2) symmetrically arranged on both the front and rear sides of its inner cavity. One end of a guide block (3) is embedded in the inner cavity of the guide rail (2). The other end of the guide block (3) extends out of the guide rail (2) and is fitted with a connecting ring (4). The inner circumference of the connecting ring (4) is provided with teeth (5). A handle (6) is installed at the bottom end of the connecting ring (4). The bottom end of the impeller (1) has a first fixing hole (7) from left to right. One end of a first bolt (8) is threaded onto the outer wall of the handle (6). The other end of the first bolt (8) passes through the handle (6) and is screwed into the inner cavity of the first fixing hole (7). The first fixing hole (7) and the first bolt (8) are threaded together. The bottom end of the impeller (1) has guide rails (2) symmetrically arranged on both the front and rear sides of its inner cavity. Each impeller (1) is provided with a second fixing hole (9). The bottom end of the impeller (1) is fitted with a first sealing cover (10). The outer wall of the first sealing cover (10) is threaded with one end of a second bolt (11). The other end of the second bolt (11) passes through the first sealing cover (10) and is screwed into the inner cavity of the second fixing hole (9). The second fixing hole (9) and the second bolt (11) are threaded together. The bottom circumference of the inner cavity of the impeller (1) is rotatably connected to one end of a connecting column (12) through a bearing. The other end of the connecting column (12) extends out of the outer wall of the impeller (1) and is fitted with blades (13). A gear (14) is installed on the outer wall of the connecting column (12). The gear (14) and the teeth (5) are meshed together.

2. The back-blade rotary vane impeller for a self-priming centrifugal pump according to claim 1, characterized in that: A sealing ring (15) is provided on the outer wall of the connecting column (12), and the sealing ring (15) is located at the connection between the connecting column (12) and the impeller (1).

3. The back-blade rotary vane impeller for a self-priming centrifugal pump according to claim 1, characterized in that: A wear-resistant coating block (16) is fitted on the outer wall of the blade (13). The top end of the wear-resistant coating block (16) is threadedly connected to one end of a third bolt (17). The other end of the third bolt (17) passes through the wear-resistant coating block (16) and is screwed into the inner cavity of the blade (13). The third bolt (17) and the blade (13) are threadedly connected to each other. A second sealing cap (18) is installed on the top end of the wear-resistant coating block (16).

4. The back-blade rotary vane impeller for a self-priming centrifugal pump according to claim 1, characterized in that: The guide block (3) is positioned at the exact center of the guide rail (2).

5. The back-blade rotary vane impeller for a self-priming centrifugal pump according to claim 1, characterized in that: The teeth (5) are matched and their positions correspond to those of the gear (14).

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