Centrifugal pump with inducer

Abstract

The utility model discloses a centrifugal pump with the structure of inducing wheel, it includes: pump body, the pump body is arranged pump shaft, one end of pump shaft is provided with magnetic coupling, the other end of pump shaft is provided with the impeller, the impeller is away from one end of magnetic coupling and is provided with the inducing wheel, the inducing wheel is connected on pump shaft, and the inducing wheel is located the liquid inlet of pump body, the inducing wheel includes the axle and the blade, the axle is connected on pump shaft, the blade is connected on the axle, and the blade is arranged spirally. Compared with prior art, the utility model discloses through the inducing wheel of additional, can let the fluid more stable through the impeller, will not produce the damage, cavitation and wear and tear to the impeller, expands the range and limit of water pump delivery fluid.

Description

Technical Field

[0001] This utility model belongs to the field of centrifugal pumps, and in particular relates to a centrifugal pump with an inducer structure. Background Technology

[0002] As a nation's manufacturing capacity accounts for an increasingly larger share of the global market, and with social development and technological advancements, pumps used in fields such as petrochemicals and aerospace are increasingly trending towards higher speeds and greater power. This has led to a growing demand for diverse types of pumps, particularly in the chemical industry. The chemical industry requires a universally applicable pump – the magnetic centrifugal pump. This type of pump is suitable for conveying strong acids and alkalis. However, magnetic pumps face a problem common to all pumps – severe corrosion due to cavitation caused by prolonged liquid transport. Given these challenges, installing a suitable inducer in the chemical pump becomes an excellent solution.

[0003] Traditional magnetic drive pumps suffer from severe cavitation problems when operating under low NPSH conditions. Magnetic drive pumps cannot run dry because the internal magnetic rotor generates heat, and if this heat is not dissipated in time, it can demagnetize the magnets. Simultaneously, the sliding bearing assembly, which serves as the pump's support, cannot run dry; otherwise, without material lubrication, it will suffer damage from dry friction. Users often pump large quantities of vaporized materials. When pumping gas-liquid mixtures, the material easily vaporizes as the pumping temperature rises, leading to dry running and pump damage. In such cases, designing a structure that resists vaporization can solve these problems. Utility Model Content

[0004] This utility model provides a centrifugal pump with an inducer structure. By adding an inducer, the fluid can pass through the impeller more smoothly without damaging, cavitating, or wearing the impeller, thus expanding the range and limitations of the fluid that the pump can deliver.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a centrifugal pump with an inducer structure, comprising:

[0006] A pump body is provided with a pump shaft inside the pump body. A magnetic coupling is provided at one end of the pump shaft, and an impeller is provided at the other end of the pump shaft. An inducer wheel is provided at the end of the impeller away from the magnetic coupling. The inducer wheel is connected to the pump shaft and is located at the liquid inlet of the pump body.

[0007] The inducer wheel includes an axle and blades. The axle is connected to the pump shaft, and the blades are connected to the axle. The blades are arranged in a spiral.

[0008] As a further description of the above technical solution:

[0009] The axle is a cylinder that is thicker at one end and thinner at the other, with the thicker end of the axle connected to the pump shaft.

[0010] As a further description of the above technical solution:

[0011] The thicker end of the axle is connected to the axle via an arc-shaped surface.

[0012] As a further description of the above technical solution:

[0013] The axle and blades are an integral structure.

[0014] As a further description of the above technical solution:

[0015] The magnetic coupling includes an inner magnetic rotor and an outer magnetic rotor. The inner magnetic rotor is connected to the pump shaft and is located inside the outer magnetic rotor. The outer magnetic rotor is connected to the output shaft of the drive motor.

[0016] As a further description of the above technical solution:

[0017] An isolation sleeve is provided between the inner magnetic rotor and the outer magnetic rotor.

[0018] As a further description of the above technical solution:

[0019] The isolation sleeve is a non-magnetic isolation sleeve.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: the induced draft wheel allows the fluid to pass through the main impeller more smoothly, without causing damage, cavitation, or wear to the impeller. It expands the range and limitations of the fluid transported by the water pump, and the smooth flow channel reduces the pressure head at the impeller inlet, significantly reducing material vaporization. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of a centrifugal pump with an inducer structure.

[0023] Figure 2 This is a schematic diagram of the structure of the inducer in a centrifugal pump with an inducer structure.

[0024] Legend:

[0025] 1. Pump body; 2. Pump shaft; 3. Impeller; 4. Inducer wheel; 41. Wheel shaft; 42. Blade; 5. Inlet; 6. Inner magnetic rotor; 7. Outer magnetic rotor; 8. Isolation sleeve. Detailed Implementation

[0026] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-2 This utility model provides a technical solution: a centrifugal pump with an inducer structure, comprising:

[0028] Pump body 1, pump shaft 2 is provided inside pump body 1, magnetic coupling is provided at one end of pump shaft 2, impeller 3 is provided at the other end of pump shaft 2, inducer 4 is provided at the end of impeller 3 away from magnetic coupling, inducer 4 is connected to pump shaft 2, inducer 4 is located at liquid inlet 5 of pump body 1;

[0029] The inducer wheel 4 includes a shaft 41 and blades 42. The shaft 41 is connected to the pump shaft 2, and the blades 42 are connected to the shaft 41. The blades 42 are arranged in a spiral.

[0030] The wheel shaft 41 is a cylindrical body that is thicker at one end and thinner at the other. The thicker end of the wheel shaft is connected to the pump shaft 2. The thicker end of the wheel shaft is connected to the wheel shaft through an arc-shaped surface. This makes the flow channel smooth and unobstructed, reduces the pressure head at the impeller inlet, and significantly reduces the vaporization of the material.

[0031] The axle 41 and blade 42 are integrated into one structure. This improves the stability of the blade connection and extends its service life.

[0032] The magnetic coupling includes an inner magnetic rotor 6 and an outer magnetic rotor 7. The inner magnetic rotor is connected to the pump shaft 2. The inner magnetic rotor 6 is located inside the outer magnetic rotor 7. The outer magnetic rotor 7 is connected to the output shaft of the drive motor.

[0033] An isolation sleeve 8 is provided between the inner magnetic rotor 6 and the outer magnetic rotor 7. The isolation sleeve 8 is a non-magnetic isolation sleeve. The isolation sleeve is made of titanium alloy, which can improve its service life. In order to further improve the service life of the titanium alloy isolation sleeve, a corrosion-resistant layer is coated on both the inner and outer surfaces of the titanium alloy isolation sleeve.

[0034] Working principle: The fluid is pre-pressurized by a pre-induced impeller, ensuring sufficient pressure for the fluid entering the impeller and guaranteeing normal operation of the main impeller under cavitation-free conditions. Typically, the induced impeller is an axial-flow impeller installed upstream of the pump's main impeller. It has a very small inlet angle of attack and a thin inlet edge, minimizing flow disturbance. This hydraulic design ensures flow stability and reduces the pressure drop at the impeller inlet, ensuring that the pressure drop entering the impeller after passing through the induced impeller is higher than the vaporization pressure of the pumped material itself. This prevents cavitation at the impeller inlet.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A centrifugal pump with an inducer structure, characterized in that, include: A pump body is provided with a pump shaft inside the pump body. A magnetic coupling is provided at one end of the pump shaft, and an impeller is provided at the other end of the pump shaft. An inducer wheel is provided at the end of the impeller away from the magnetic coupling. The inducer wheel is connected to the pump shaft and is located at the liquid inlet of the pump body. The inducer wheel includes an axle and blades. The axle is connected to the pump shaft, and the blades are connected to the axle. The blades are arranged in a spiral.

2. A centrifugal pump with an inducer structure according to claim 1, characterized in that, The axle is a cylinder that is thicker at one end and thinner at the other, with the thicker end of the axle connected to the pump shaft.

3. A centrifugal pump with an inducer structure according to claim 1, characterized in that, The thicker end of the axle is connected to the axle via an arc-shaped surface.

4. A centrifugal pump with an inducer structure according to claim 1, characterized in that, The axle and blades are an integral structure.

5. A centrifugal pump with an inducer structure according to claim 1, characterized in that, The magnetic coupling includes an inner magnetic rotor and an outer magnetic rotor. The inner magnetic rotor is connected to the pump shaft and is located inside the outer magnetic rotor. The outer magnetic rotor is connected to the output shaft of the drive motor.

6. A centrifugal pump with an inducer structure according to claim 5, characterized in that, An isolation sleeve is provided between the inner magnetic rotor and the outer magnetic rotor.

7. A centrifugal pump with an inducer structure according to claim 6, characterized in that, The isolation sleeve is a non-magnetic isolation sleeve.

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