Multi-stage pump and multi-stage impeller assembly

Abstract

The utility model provides a multi-stage pump and a multi-stage impeller assembly, and belongs to the technical field of water pumps. The problem that a multi-stage water pump impeller in the prior art is prone to damage is solved. The multi-stage pump comprises a water inlet seat, a water outlet seat, a multi-stage pump shaft and a multi-stage impeller assembly, the multi-stage impeller assembly comprises a middle-section pump shell, a guide vane and an impeller body, a first containing groove is formed in the middle-section pump shell, a flow guide block is integrally formed on the front side of the guide vane, a flow guide hole is formed in the side end face of the flow guide block, and a flow guide channel is formed in the guide vane. A shaft hole is formed in the center of the impeller body, positioning hubs are formed on the two sides, on the outer side of the shaft hole, of the impeller body, circular ring bodies are formed on the sides, on the peripheries of the positioning hubs, of the impeller body, and damping grooves are formed between the positioning hubs and the circular ring bodies. The impeller has the advantages of being good in impeller protectiveness and high in fluid transportation efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of water pump technology and relates to a multi-stage pump and a multi-stage impeller assembly. Background Technology

[0002] When a multistage pump is conveying a medium containing solid particles, the particles scour the impeller blade inlet edge, blade surface and flow channel wall at high speed, causing the blades to become thinner, the flow channel surface to become rougher, and even forming grooved wear. The wear is more significant at the blade outlet due to the higher flow velocity.

[0003] Chinese patent publication number CN209704926U discloses a multi-stage centrifugal pump guide impeller, including a pump shaft. A guide chamber and an impeller are sequentially arranged on the surface of the pump shaft. A support plate is arranged in the middle of the inner wall of the guide chamber. A guide vane plate is arranged on the side of the support plate away from the impeller. A water outlet is arranged at the center of the guide vane plate. Guide blocks are fixedly connected at equal intervals on the edge of the support plate away from the guide vane plate. A guard plate is fixedly connected on the side of the guide blocks away from the support plate. Flow holes are opened at equal intervals on the edge of the support plate and between the guide blocks. Baffles are arranged at equal intervals inside the impeller. A water inlet is arranged at the center of the side of the impeller away from the support plate. The baffles divide the inner cavity of the impeller into several spiral chambers. The impeller adopts a design with a central drum and thin edges.

[0004] The patent provides a multi-stage centrifugal pump impeller with a central drum and thin edge design. However, the thin edge makes it more prone to deformation, fatigue cracks or even breakage when subjected to centrifugal force, fluid impact force or particle scouring during high-speed rotation. Especially when conveying media containing solid particles, wear is aggravated, shortening the impeller's service life. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the prior art by providing a multi-stage pump and a multi-stage impeller assembly.

[0006] The objective of this utility model can be achieved through the following technical solution: A multi-stage pump and a multi-stage impeller assembly, including an inlet seat, an outlet seat, a multi-stage pump shaft, and a multi-stage impeller assembly. The multi-stage pump shaft passes sequentially through the inlet seat, the multi-stage impeller assembly, and the multi-stage pump shaft. The multi-stage impeller assembly includes a middle section pump casing, guide vanes, and an impeller body. A first placement groove is formed inside the middle section pump casing, and the guide vanes are installed inside the first placement groove of the middle section pump casing. A plurality of guide blocks arranged in a circular array are integrally formed on the front side of the guide vanes. A flow guide hole is provided on the side end face of the flow block, and a flow guide channel is formed inside the guide vane. The flow guide channel is connected to the flow guide hole. Several flow guide blades arranged in a circumferential array are fixed on the front side of the flow block. A second placement groove is provided on the rear side of the guide vane and the impeller body is installed inside the second placement groove. A shaft hole is provided at the center of the impeller body. Positioning hubs are formed on both sides of the impeller body outside the shaft hole. A ring is formed on one side of the impeller body outside the positioning hub. A damping groove is formed between the positioning hub and the ring.

[0007] In the aforementioned multistage pump and multistage impeller assembly, a plurality of front mounting seats and rear mounting seats are formed in the inlet seat and the outlet seat, respectively, and a tensioning long bolt is fixedly installed between the front mounting seats and the rear mounting seats.

[0008] In the aforementioned multi-stage pump and multi-stage impeller assembly, an inlet side flange is fixedly installed on one side of the inlet seat, the inlet side flange is connected to the pump shaft, and an inlet bearing seat is fixedly connected to the outside of the inlet seat.

[0009] In the above-mentioned multi-stage pump and multi-stage impeller assembly, a packing seat is fixedly installed on one side of the outlet seat, and an outlet bearing seat and an outlet side pressure flange are fixedly connected on one side of the packing seat. The outlet bearing seat is covered outside the outlet side pressure flange.

[0010] In the aforementioned multi-stage pump and multi-stage impeller assembly, a reinforcing protrusion is formed on one side of the guide vane.

[0011] Compared with the prior art, the multi-stage pump and multi-stage impeller assembly provided by this utility model have the following beneficial effects: 1. The impeller body is installed inside the second placement groove on the rear side of the guide vane. This design makes the two fit tightly, enhances the overall structural strength, reduces shaking and wear during operation, reduces the risk of structural damage, and extends the service life of the assembly; 2. The guide block on the front side of the guide vane adopts an integrated molding process, eliminating splicing gaps, improving the structural strength of the guide vane itself, and making it less prone to damage under the impact of high-speed water flow; 3. The integrated molding of the guide block makes the connection between the guide hole on the side end face of the guide block and the guide channel inside the guide vane smoother. When water flows through, there is less resistance and less turbulence, which can guide the water flow more accurately, optimize the flow field distribution, improve the hydraulic efficiency of the multi-stage pump, and ensure the pump operates efficiently. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0014] Figure 3 This is a schematic diagram of the middle section pump casing structure;

[0015] Figure 4 This is a schematic diagram of the guide vane structure;

[0016] Figure 5 This is a schematic diagram of the guide vane structure at another angle;

[0017] Figure 6 This is a schematic diagram of the impeller structure.

[0018] In the diagram: 1. Inlet seat; 11. Front mounting seat; 2. Outlet seat; 21. Rear mounting seat; 3. Multistage pump shaft; 4. Multistage impeller assembly; 41. Intermediate pump casing; 411. First placement slot; 42. Guide vane; 421. Guide block; 422. Guide hole; 423. Guide channel; 424. Guide blade; 425. Second placement slot; 426. Reinforcing protrusion; 43. Impeller body; 431. Shaft hole; 432. Positioning hub; 433. Circular ring; 434. Vibration damping groove; 5. Tightening bolt; 6. Inlet side pressure flange; 7. Inlet bearing seat; 8. Packing seat; 9. Outlet bearing seat; 10. Outlet side pressure flange. Detailed Implementation

[0019] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0020] like Figures 1 to 6As shown, this embodiment includes an inlet seat 1, an outlet seat 2, a multi-stage pump shaft 3, and a multi-stage impeller assembly 4. The multi-stage pump shaft 3 passes sequentially through the inlet seat 1, the multi-stage impeller assembly 4, and the multi-stage pump shaft 3. The multi-stage impeller assembly 4 includes several intermediate pump casings 41, guide vanes 42, and impeller bodies 43. A first placement groove 411 is formed on the rear side of the interior of the intermediate pump casing 41. The guide vanes 42 are sleeved on the pump shaft and installed inside the first placement groove 411 of the intermediate pump casing 41. Several guide blocks 421 arranged in a circular array are integrally formed on the front side of the guide vanes 42. Guide holes 422 are opened on the side end faces of the guide blocks 421. A guide channel 423 is formed inside the guide vanes 42. 423 is connected to the guide hole 422. Several guide vanes 424 arranged in a circular array are fixed on the front side of the guide block 421. A second placement groove 425 is opened on the rear side of the guide vane 42. A shaft hole 431 is opened at the center of the impeller body 43 and is connected to the pump shaft through the shaft hole 431. The impeller body 43 is installed inside the second placement groove 425. Positioning hubs 432 are formed on both sides of the impeller body 43 outside the shaft hole 431. A ring body 433 is formed on one side of the impeller body 43 around the positioning hub 432. A shock-absorbing groove 434 is formed between the positioning hub 432 and the ring body 433. The shock-absorbing groove 434 buffers the direct impact force of the pump shaft on the impeller body 43.

[0021] like Figures 1 to 2 As shown, a packing seat 8 is fixedly installed on one side of the outlet seat 2. An outlet bearing seat 9 and an outlet pressure flange 10 are fixedly connected to one side of the packing seat 8. The outlet bearing seat 9 covers the outside of the outlet pressure flange 10, ensuring the sealing and stability of the outlet end of the pump shaft 3. An inlet pressure flange 6 is fixedly installed on one side of the inlet seat 1. The inlet pressure flange 6 is connected to the pump shaft 3. An inlet bearing seat 7 is also fixedly connected to the outside of the inlet seat 1, providing stable support for the rotation of the pump shaft 3.

[0022] To elaborate further, such as Figure 4 As shown, a reinforcing protrusion 426 is formed on one side of the guide vane 424, which enhances the structural strength of the guide vane 424, improves its impact resistance and fatigue resistance, and extends the service life of the guide vane 42.

[0023] To elaborate further, such as Figures 1 to 2 As shown, the inlet seat 1 and the outlet seat 2 each have several front mounting seats 11 and rear mounting seats 21. The front mounting seats 11 and the rear mounting seats 21 are fixedly installed by tightening long bolts 5. This structure makes the overall structure of the multi-stage pump more stable.

[0024] The working principle of this utility model is as follows: During operation, the liquid enters the multi-stage pump from the inlet seat 1 and flows to the multi-stage impeller assembly 4 through the inlet side pressure flange 6 and the inlet bearing seat 7. In the multi-stage impeller assembly 4, the liquid gains energy through the action of the impeller body 43 in sequence, and then flows to the subsequent impeller body 43 for further pressurization through the guide block 421, guide hole 422 and guide channel 423 of the guide vane 42. Finally, it is discharged through the outlet seat 2. The vibration damping groove 434 on the impeller body 43 can reduce the vibration and noise of the pump during operation and improve the operation stability and reliability of the pump.

[0025] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0026] Although this document uses a variety of terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. A multistage pump and a multistage impeller assembly, comprising an inlet seat (1), an outlet seat (2), a multistage pump shaft (3), and a multistage impeller assembly (4), wherein the multistage pump shaft (3) sequentially passes through the inlet seat (1), the multistage impeller assembly (4), and the multistage pump shaft (3), characterized in that: The multi-stage impeller assembly (4) includes a mid-section pump casing (41), guide vanes (42), and an impeller body (43). A first placement groove (411) is formed inside the mid-section pump casing (41), and the guide vanes (42) are installed inside the first placement groove (411) of the mid-section pump casing (41). A plurality of guide blocks (421) arranged in a circular array are integrally formed on the front side of the guide vanes (42). Guide holes (422) are opened on the side end faces of the guide blocks (421). A guide channel (423) is formed inside the guide vanes (42), and the guide channel (423) communicates with the guide holes (422). A number of guide vanes (424) arranged in a circular array are fixed on the front side of the block (421). A second placement groove (425) is opened on the rear side of the guide vane (42) and the impeller body (43) is installed inside the second placement groove (425). A shaft hole (431) is opened at the center of the impeller body (43). A positioning hub (432) is formed on both sides of the impeller body (43) outside the shaft hole (431). A ring body (433) is formed on one side of the impeller body (43) on the outer periphery of the positioning hub (432). A damping groove (434) is formed between the positioning hub (432) and the ring body (433).

2. The multi-stage pump and multi-stage impeller assembly according to claim 1, characterized in that: The water inlet seat (1) and the water outlet seat (2) are respectively provided with a number of front mounting seats (11) and rear mounting seats (21), and a tensioning long screw (5) is fixedly installed between the front mounting seats (11) and the rear mounting seats (21).

3. The multi-stage pump and multi-stage impeller assembly according to claim 1, characterized in that: A water inlet side flange (6) is fixedly installed on one side of the water inlet seat (1). The water inlet side flange (6) is connected to the pump shaft. A water inlet bearing seat (7) is fixedly connected to the outside of the water inlet seat (1).

4. A multi-stage pump and multi-stage impeller assembly according to claim 1, characterized in that: A packing seat (8) is fixedly installed on one side of the water outlet seat (2). A water outlet bearing seat (9) and a water outlet side pressure flange (10) are fixedly connected on one side of the packing seat (8). The water outlet bearing seat (9) covers the outside of the water outlet side pressure flange (10).

5. A multi-stage pump and multi-stage impeller assembly according to claim 1, characterized in that: A reinforcing protrusion (426) is formed on one side of the guide vane (424).

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