Single-suction centrifugal pump impeller and single-suction centrifugal pump

Abstract

The utility model relates to a single suction centrifugal pump impeller which comprises an impeller body and an impeller wear ring, the impeller wear ring comprises an inner pipe and an outer pipe, the inner pipe is fixedly connected to the impeller body, the outer pipe is arranged on the inner pipe in a sleeved mode, and a step abutting against the outer pipe is arranged on the inner pipe or the impeller body. The impeller wear ring has the advantages that the impeller wear ring is arranged to be of the structure of the inner pipe and the outer pipe, the inner pipe is fixedly connected to the impeller body, the outer pipe is arranged on the inner pipe in a sleeved mode, when the gap between the impeller wear ring and the volute wear ring is enlarged, the impeller wear ring is processed to be flat through a lathe, and therefore the impeller wear ring is prevented from being damaged. According to the impeller of the single-suction centrifugal pump, the outer pipe is replaced according to the actual clearance requirement, so that the abraded impeller wear ring can be rapidly repaired to the original state, the original efficiency of the water pump is achieved, and the maintenance cost is greatly reduced. The utility model further discloses the single-suction centrifugal pump which comprises the impeller of the single-suction centrifugal pump.

Description

TECHNICAL FIELD

[0001] The utility model relates to a single suction centrifugal pump impeller and single suction centrifugal pump. BACKGROUND

[0002] In the production process, it is inevitable to encounter the situation that the early-stage inspection is not in place before the fault, resulting in serious equipment accidents. When a single suction water pump is running, the rotor is not on the same horizontal line due to the wear of the bearing. In this case, the rotor is drooping under the influence of gravity, and further causes the friction between the impeller ring and the lower ring of the volute, resulting in the increase of the gap between the impeller ring and the volute ring. Even if the bearing is replaced later, the centrifugal pump can not reach the original efficiency. In order to solve this problem, the impeller is usually replaced, which will generate a large amount of maintenance cost. SUMMARY

[0003] The utility model discloses a single suction centrifugal pump impeller, which sets the impeller ring into the structure of inner tube and outer tube. Since the inner tube is fixedly connected to the impeller body, and the outer tube is sleeved on the inner tube, when the gap between the impeller ring and the volute ring increases, the impeller ring is processed flat by a lathe, and then the outer tube is replaced according to the actual gap requirement, so that the worn impeller ring can be quickly repaired to the original state, reaching the original efficiency of the water pump and greatly reducing the maintenance cost.

[0004] In order to solve the above technical problems, the utility model is realized through the following technical scheme: a single suction centrifugal pump impeller, comprising an impeller body and an impeller ring, wherein the impeller ring comprises an inner tube and an outer tube, the inner tube is fixedly connected to the impeller body, the outer tube is sleeved on the inner tube, and a step is arranged on the inner tube or the impeller body and abuts against the outer tube, and the outer tube is fixed on the step through argon arc welding.

[0005] Preferably, the outer tube and the inner tube are in interference fit.

[0006] Preferably, a smooth surface is arranged on the outer side wall of the inner tube and the inner side wall of the outer tube.

[0007] Preferably, the inner tube and the impeller body are in integral structure.

[0008] Preferably, the outer tube is a steel pipe.

[0009] Preferably, a polishing layer is arranged on the outer side wall of the outer tube.

[0010] Preferably, a V-shaped groove is arranged between the outer tube and the step.

[0011] Preferably, the V-shaped groove has a groove angle of 30-60°, and the V-shaped groove has a root gap of 0-3mm and a land of 1-2mm.

[0012] The utility model discloses still provide a single suction centrifugal pump, including pump body and the impeller of setting in the pump body, the impeller adopts above-mentioned single suction centrifugal pump impeller.

[0013] Therefore, the worn impeller mouth ring can be quickly repaired to the original state, the original efficiency of the water pump is reached, and the maintenance cost is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] The utility model will be further described in connection with the drawings:

[0015] Figure 1 It is the structural diagram of the utility model single suction centrifugal pump impeller;

[0016] Figure 2 It is the local diagram between the utility model outer tube and step.

[0017] Reference signs:

[0018] 1 impeller body, 2 impeller mouth ring, 21 inner tube, 22 outer tube, 23 polishing layer, 3 step, 4 V-shaped groove. DETAILED DESCRIPTION Example one

[0019] As shown in Figure 1 and Figure 2 A single suction centrifugal pump impeller, comprising an impeller body 1 and an impeller mouth ring 2, the impeller mouth ring 2 comprises an inner tube 21 and an outer tube 22, the inner tube 21 is fixedly connected on the impeller body 1, the outer tube 22 is sleeved on the inner tube 21, and the inner tube 21 or the impeller body 1 is provided with a step 3 abutting against the outer tube 22, and the outer tube 22 is fixed on the step 3 by argon arc welding.

[0020] The impeller ring is arranged in the structure of the inner tube and the outer tube, the inner tube is fixedly connected to the impeller body, and the outer tube is sleeved on the inner tube. When the gap between the impeller ring and the volute ring becomes large, the impeller ring is processed flat by a lathe, and then the outer tube is replaced according to the actual gap requirement, so that the worn impeller ring can be quickly repaired to the original state, the original efficiency of the water pump is reached, and the maintenance cost is greatly reduced. In addition, the setting of the step can realize accurate positioning of the outer tube, improve the assembly quality of the outer tube, and improve the stability of the entire impeller ring. The argon arc welding can improve the connection strength between the outer tube and the step, and can reduce the influence on the impeller body during welding. Finally, the size of the impeller ring can be adjusted by installing outer tubes of different sizes, so that the impeller can be adapted to different types of single-suction centrifugal pumps, and different installation requirements can be met.

[0021] The outer tube 22 and the inner tube 21 are in interference fit. The interference fit between the outer tube and the inner tube can realize the close connection between the inner tube and the outer tube, avoid the relative sliding between the inner tube and the outer tube due to vibration or load change, effectively transmit the axial force and torque, and improve the carrying capacity of the overall structure. In addition, without additional fasteners, the assembly can be completed by press fitting or thermal expansion and contraction method, reducing the complexity of the process. Finally, the contact surface between the outer tube and the inner tube prevents the invasion of pollutants. The outer side wall of the inner tube 21 and the inner side wall of the outer tube 22 are both provided with a smooth surface. On the one hand, it can reduce the friction coefficient during assembly, facilitate accurate positioning and installation of the inner and outer tubes, and reduce assembly damage caused by rough surface. On the other hand, it can enhance the sealing effect of the inner tube and the outer tube. Specifically, when replacing, the weld between the outer tube and the step is cut by a cutting assembly, and then the outer tube and the inner tube are separated by a professional clamp. The separated inner tube needs to be processed flat by a lathe. The inner tube 21 and the impeller body 1 are in an integrated structure, which can effectively reduce the installation process between the inner tube and the impeller body and improve the connection strength between the inner tube and the impeller body. The outer tube 22 is a steel tube, which can ensure the stability of the entire impeller ring and improve the overall service life. The outer side wall of the outer tube 22 is provided with a polishing layer 23, which can effectively reduce the friction coefficient and improve the assembly quality.

[0022] The V-shaped groove 4 is arranged between the outer tube 22 and the step 3, and the V-shaped groove can provide sufficient welding space, so that the welding material is fully fused, the stress concentration in the welding process is reduced, the risk of cracks and structural deformation is reduced, the molten pool dynamics such as slag separation and molten hole size can be observed, the welding parameters can be adjusted in real time by combining visual and auditory judgment, the process stability is improved, and the V-shaped groove is simple to process. Specifically, the groove angle of the V-shaped groove 4 is 60-70°. By setting the groove angle of the V-shaped groove 4 to 60-70°, the penetration and welding efficiency can be effectively balanced, the root penetration can be ensured, the amount of filler metal caused by excessive angle is avoided, the welding deformation and residual stress are reduced, in addition, the groove angle of 60-70° is convenient for the welder to operate, and the working strength of the operator is reduced. When the groove angle is less than 60°, the welding quality is prone to be reduced, the welding requirement is improved, when the groove angle is greater than 70°, on the one hand, the amount of deposited metal is significantly increased, the welding material is wasted, the welding cost is increased, and the welding difficulty is increased, so that the production efficiency is reduced, on the other hand, the welding quality is reduced, and the mechanical properties of the whole impeller ring are affected. The root gap of the V-shaped groove is equal to 0-3mm, and the land of the V-shaped groove is equal to 1-2mm. By setting the root gap of the V-shaped groove to 0-3mm and cooperating with the land of 1-2mm, the burn-through can be effectively prevented, the arc can penetrate the root stably, the incomplete penetration or molten pool collapse can be avoided, on the other hand, the shrinkage deformation caused by heat input can be reduced, and the overall welding quality is improved. In the embodiment, the groove angle of the V-shaped groove 4 is preferably 60°, the root gap of the V-shaped groove is preferably 2mm, and the land of the V-shaped groove is preferably 1mm. Embodiment two

[0023] The embodiment also discloses a single-suction centrifugal pump, which comprises a pump body and an impeller arranged in the pump body.

[0024] In addition to the preferred embodiments, the utility model also has other implementation manners, and those skilled in the art can make various changes and deformation according to the utility model, as long as the changes and deformation do not deviate from the spirit of the utility model, and all should belong to the range defined by the appended claims of the utility model.

Claims

1. A single suction centrifugal pump impeller comprising an impeller body (1) and an impeller eye ring (2), characterized in that: The impeller mouth ring (2) comprises an inner tube (21) and an outer tube (22), the inner tube (21) is fixedly connected to the impeller body (1), the outer tube (22) is sleeved on the inner tube (21), and the inner tube (21) or the impeller body (1) is provided with a step (3) abutting against the outer tube (22), and the outer tube (22) is fixed on the step (3) by argon arc welding.

2. A single suction centrifugal pump impeller according to claim 1, characterized in that: The outer tube (22) and the inner tube (21) are in interference fit.

3. A single suction centrifugal pump impeller according to claim 2, characterized in that: The outer side wall of the inner tube (21) and the inner side wall of the outer tube (22) are both provided with a smooth surface.

4. A single suction centrifugal pump impeller according to claim 1, characterized in that: The inner tube (21) and the impeller body (1) are in integral structure.

5. A single suction centrifugal pump impeller according to claim 3, characterized in that: The outer tube (22) is a steel tube.

6. A single suction centrifugal pump impeller according to claim 1, characterized in that: The outer side wall of the outer tube (22) is provided with a polishing layer (23).

7. A single suction centrifugal pump impeller according to claim 1, characterized in that: A V-shaped groove (4) is arranged between the outer tube (22) and the step (3).

8. A single suction centrifugal pump impeller according to claim 7, characterized in that: The included angle of the V-shaped groove (4) is 60-70°, the root gap of the V-shaped groove is equal to 0-3mm, and the blunt edge of the V-shaped groove is equal to 1-2mm.

9. A single suction centrifugal pump comprising a pump body and an impeller disposed within the pump body, characterized by: The impeller is the single-suction centrifugal pump impeller as claimed in any one of claims 1-8.

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