Novel high-speed multistage pump rotor

Abstract

The utility model relates to the technical field of multi-stage pumps, and discloses a novel high-speed multi-stage pump rotor which comprises a pump shaft, a coupler is installed at one end of the pump shaft, a second shaft sleeve is arranged on the circumferential outer wall, close to the coupler, of the pump shaft, a first shaft sleeve is arranged at the end, away from the coupler, of the pump shaft, and the pump shaft is a step shaft. Steps are evenly arranged on the circumferential outer wall of the pump shaft, a pump shaft groove is formed in the surface of the pump shaft, a flat key is arranged in the pump shaft groove and matched with the pump shaft groove, impeller hubs are evenly arranged on the circumferential outer wall of the pump shaft, and sealing gaskets are arranged on the opposite sides of the impeller hubs. According to the novel high-speed multi-stage pump rotor, the pump shaft is connected through the coupler, the diameter of the end, connected with the coupler, of the pump shaft is larger than that of the other end of the pump shaft, larger strength and bearing capacity can be provided, the impellers with different diameters are arranged on the pump shaft through the shaft sections with different diameters of the pump shaft, and the practicability of the novel high-speed multi-stage pump rotor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of multistage pumps, in particular to a novel high-speed multistage pump rotor. Background Art

[0002] A multistage pump is a centrifugal pump, which is characterized by having two or more impellers. This pump forms a series structure by combining multiple centrifugal pumps with the same function, so as to increase the set pressure. The inlet and outlet sections and the middle section of the multistage pump are combined together by a pull rod, and rely on the rotation of the impeller to obtain centrifugal force, so as to realize the transportation of materials. Its output water pressure can be very large, and it also relies on the rotation of the impeller to obtain centrifugal force. The working principle of the multistage pump is based on the change of the pump cavity volume to realize the processes of suction, compression and exhaust. Therefore, it is a variable-volume centrifugal pump. The basic structure of the multistage pump is composed of components such as an inlet section, an outlet section, a middle section, a tail cover, an impeller, a pump body, a pump shaft, etc.

[0003] The novel high-speed multistage pump rotor is one of the core components of the pump. It transports the medium from the low-pressure area to the high-pressure area by rotation. The working principle of the multistage pump rotor is to form a flow channel between the inner wall and the outer wall of the rotor, and compress and transport the medium by the rotation of the rotor. Since the multistage pump rotor can improve the compression efficiency of the medium to a very high level, the multistage pump is widely used in various fields, such as the fields of petroleum, chemical industry, papermaking, electric power, etc. However, when the existing novel high-speed multistage pump rotor is applied, it is often evenly arranged on the pump shaft, and impellers with different diameters cannot be arranged on the pump shaft according to different requirements. Summary of the Utility Model

[0004] In order to make up for the above deficiencies, the utility model provides a novel high-speed multistage pump rotor, aiming to improve the problem that when the existing novel high-speed multistage pump rotor is applied, it is often evenly arranged on the pump shaft, and impellers with different diameters cannot be arranged on the pump shaft according to different requirements.

[0005] To achieve the above object, the utility model provides the following technical scheme: A novel high-speed multistage pump rotor, including a pump shaft, one end of the pump shaft is installed with a coupling, a second shaft sleeve is arranged on the circumferential outer wall of the pump shaft close to the coupling, a first shaft sleeve is arranged at the end of the pump shaft far from the coupling, the pump shaft is a stepped shaft, steps are evenly arranged on the circumferential outer wall of the pump shaft, a pump shaft groove is arranged on the surface of the pump shaft, a flat key is arranged inside the pump shaft groove, the flat key matches the pump shaft groove, impeller hubs are evenly arranged on the circumferential outer wall of the pump shaft, and a sealing gasket is arranged on one side opposite to the impeller hubs.

[0006] Preferably, a hub groove is arranged inside the impeller hub, and the hub groove matches the flat key.

[0007] Preferably, one end of the impeller hub is fixedly connected with a front cover plate, and the end of the impeller hub away from the front cover plate is fixedly connected with a rear cover plate.

[0008] Preferably, the outer surface of the impeller hub is uniformly fixedly connected with blades.

[0009] Preferably, the blades are located between the front cover plate and the rear cover plate.

[0010] Preferably, a transition arc is provided on the outer wall of the step.

[0011] Preferably, the sealing gasket is a self-expanding sealing gasket.

[0012] The utility model has the following beneficial effects:

[0013] 1. In the utility model, the pump shaft is connected by a coupling, and the diameter of the end of the pump shaft connected to the coupling is larger than the diameter of the other end of the pump shaft, which can provide greater strength and load-bearing capacity. Through the shaft sections with different diameters of the pump shaft, impeller hubs with different diameters can be set, and different-diameter impellers can be arranged on the pump shaft according to different requirements, improving the practicability of the rotor of the new high-speed multi-stage pump.

[0014] 2. In the utility model, the sealing gasket can prevent adjacent impeller hubs from wearing when the pump shaft rotates, and the first shaft sleeve and the second shaft sleeve on the pump shaft can avoid wear between the pump shaft and the pump body during operation, correspondingly improving the service life of the rotor of the new high-speed multi-stage pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional structural schematic diagram of a rotor of a new high-speed multi-stage pump proposed by the utility model;

[0016] Figure 2 is a schematic diagram of the pump shaft of a rotor of a new high-speed multi-stage pump proposed by the utility model;

[0017] Figure 3 is a schematic diagram of the impeller hub of a rotor of a new high-speed multi-stage pump proposed by the utility model.

[0018] LEGEND DESCRIPTION:

[0019] 1. Pump shaft; 2. Coupling; 3. Pump shaft groove; 4. Flat key; 5. Step; 6. Impeller hub; 7. Hub groove; 8. Front cover plate; 9. Rear cover plate; 10. Blade; 11. First shaft sleeve; 12. Sealing gasket; 13. Second shaft sleeve. DETAILED DESCRIPTION OF THE EMBODIMENTS

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

[0021] Referring to Figures 1-3 , an embodiment provided by the present invention: a novel high-speed multi-stage pump rotor, including a pump shaft 1, one end of the pump shaft 1 is installed with a coupling 2, a second shaft sleeve 13 is arranged on the circumferential outer wall of the pump shaft 1 close to the coupling 2, one end of the pump shaft 1 far from the coupling 2 is provided with a first shaft sleeve 11, the pump shaft 1 is a stepped shaft, steps 5 are evenly arranged on the circumferential outer wall of the pump shaft 1, a pump shaft groove 3 is arranged on the surface of the pump shaft 1, a flat key 4 is arranged inside the pump shaft groove 3, the flat key 4 matches the pump shaft groove 3, impeller hubs 6 are evenly arranged on the circumferential outer wall of the pump shaft 1, and a sealing gasket 12 is arranged on one side opposite to the impeller hubs 6.

[0022] Specifically, the pump shaft 1 is connected by the coupling 2, and the diameter of the end of the pump shaft 1 connected to the coupling 2 is larger than the diameter of the other end of the pump shaft 1, which can provide greater strength and load-bearing capacity. Through the shaft sections with different diameters of the pump shaft 1, impeller hubs 6 with different diameters can be set, and different-diameter impellers can be arranged on the pump shaft 1 according to different requirements, improving the practicability of the novel high-speed multi-stage pump rotor. Through the sealing gasket 12, adjacent two impeller hubs 6 can be prevented from wearing when the pump shaft 1 rotates. Through the first shaft sleeve 11 and the second shaft sleeve 13 on the pump shaft 1, the pump shaft 1 can be prevented from wearing against the pump body during operation, correspondingly improving the service life of the novel high-speed multi-stage pump rotor.

[0023] A hub groove 7 is arranged inside the impeller hub 6, and the hub groove 7 matches the flat key 4; one end of the impeller hub 6 is fixedly connected with a front cover plate 8, and the end of the impeller hub 6 far from the front cover plate 8 is fixedly connected with a rear cover plate 9; blades 10 are evenly and fixedly connected to the outer surface of the impeller hub 6; the blades 10 are located between the front cover plate 8 and the rear cover plate 9; a transition arc is arranged on the outer wall of the step 5; the sealing gasket 12 is a self-expanding sealing gasket.

[0024] Specifically, one end of the coupling 2 is connected to a motor or other transmission device. Through the matching of the flat key 4 with the pump shaft groove 3 and the hub groove 7, when the coupling 2 drives the pump shaft 1 to rotate, the impeller hub 6 can be synchronously driven to rotate, thereby driving the blades 10 to operate. By arranging a transition arc on the outer wall of the step 5, the stress concentration is correspondingly reduced, and the torque transmission capacity of the pump shaft 1 is improved. When transmitting the same torque, the shaft diameter of the pump shaft 1 is reduced, improving the manufacturing economy of the novel high-speed multi-stage pump rotor.

[0025] Working principle: One end of the coupling 2 is connected to a motor or other transmission device. The pump shaft 1 is connected through the coupling 2. Moreover, the diameter of the pump shaft 1 where it is connected to one end of the coupling 2 is larger than the diameter of the other end of the pump shaft 1, which can provide greater strength and load-bearing capacity. Through the shaft sections with different diameters of the pump shaft 1, impeller hubs 6 with different diameters can be set, enabling impellers with different diameters to be arranged on the pump shaft 1 according to different requirements, thus improving the practicability of the rotor of the new high-speed multi-stage pump. Through the matching of the flat key 4 with the pump shaft groove 3 and the hub groove 7, when the coupling 2 drives the pump shaft 1 to rotate, the impeller hub 6 can be synchronously driven to rotate, thereby driving the blade 10 to operate. By providing a transition arc on the outer wall of the step 5, the stress concentration is correspondingly reduced, improving the torque transmission ability of the pump shaft 1. Through the sealing gasket 12, when the pump shaft 1 rotates, wear between two adjacent impeller hubs 6 can be prevented. Through the first shaft sleeve 11 and the second shaft sleeve 13 on the pump shaft 1, wear between the pump shaft 1 and the pump body during operation can be avoided, correspondingly increasing the service life of the rotor of the new high-speed multi-stage pump.

[0026] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A new type of high-speed multi-stage pump rotor, including a pump shaft (1), characterized in that: One end of the pump shaft (1) is equipped with a coupling (2). A second shaft sleeve (13) is provided on the circumferential outer wall of the pump shaft (1) near the coupling (2). One end of the pump shaft (1) away from the coupling (2) is provided with a first shaft sleeve (11). The pump shaft (1) is a stepped shaft. Steps (5) are evenly arranged on the circumferential outer wall of the pump shaft (1). A pump shaft groove (3) is provided on the surface of the pump shaft (1). A flat key (4) is arranged inside the pump shaft groove (3). The flat key (4) matches the pump shaft groove (3). Impeller hubs (6) are evenly arranged on the circumferential outer wall of the pump shaft (1). A sealing gasket (12) is arranged on one side opposite to the impeller hub (6).

2. A novel high-speed multi-stage pump rotor according to claim 1, characterized in that: A hub groove (7) is arranged inside the impeller hub (6). The hub groove (7) matches the flat key (4).

3. A novel high-speed multi-stage pump rotor according to claim 1, characterized in that: One end of the impeller hub (6) is fixedly connected to a front cover plate (8). One end of the impeller hub (6) away from the front cover plate (8) is fixedly connected to a rear cover plate (9).

4. A novel high-speed multi-stage pump rotor according to claim 1, characterized in that: Blades (10) are evenly and fixedly connected to the outer surface of the impeller hub (6).

5. A novel high-speed multi-stage pump rotor according to claim 4, characterized in that: The blades (10) are located between the front cover plate (8) and the rear cover plate (9).

6. A novel high-speed multi-stage pump rotor according to claim 1, characterized in that: A transition arc is arranged on the outer wall of the step (5).

7. A novel high-speed multi-stage pump rotor according to claim 1, characterized in that: The sealing gasket (12) is a self-expanding sealing gasket.

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