Novel submerged pump balance structure

Abstract

The invention relates to a novel submerged pump balance structure which comprises a filter screen, a pump cover, a pump body, an impeller, an impeller nut, a key and a shaft. The filter screen is fixed at the pump inlet, the pump body adopts a double-volute pump body, and the pump body and the pump cover are detachably fixed together; the impeller is fixed on the pump shaft, the impeller is connected with the shaft through a key on the pump shaft, and an independent impeller passage is arranged on the back surface of the impeller; a partition plate is arranged in the double-volute pump body. According to the double-volute structure, the radial resultant force is effectively neutralized, the radial force is reduced, and bearing abrasion is reduced. Compared with a traditional single-volute structure, the problems of vibration and noise caused by radial force unbalance are remarkably reduced. Self-balancing of axial force is achieved through the design of the back flow channel of the impeller, a sealing structure does not need to be additionally arranged, and the problems of leakage loss and structure complexity caused by a traditional balance hole or a balance disc are solved. Through the synergistic effect of the double volutes and the back flow channel of the impeller, the operation stability is improved, and the maintenance cost is remarkably reduced.

Description

Technical Field

[0001] The invention relates to a balancing structure, in particular to a novel submersible pump balancing structure which can realize symmetrical offset of fluid pressure, reduce radial force, reduce vibration and noise, and realize self-balancing of axial force. Background Art

[0002] In industrial production, submersible pumps are widely used to transport various liquids. However, during the operation of traditional submersible pumps, radial force and axial force will be generated due to the rotation of the impeller. The radial force will cause wear of the pump body and bearings, affecting the service life and stability of the pump; the axial force will cause friction between the impeller and the pump body, reducing the efficiency of the pump and even damaging the equipment. Although some pumps on the market have taken some measures to balance these forces, the effect is not ideal and cannot meet the growing industrial needs.

[0003] When the existing single-volute submersible pump is in operation, the asymmetric pressure distribution of the fluid at the impeller outlet will form an uneven radial load in the volute, resulting in an imbalance of radial force. This periodically changing radial force not only aggravates bearing wear, but also causes vibration and noise, restricting the efficient and stable operation of the pump. The pressure difference caused by the difference in area between the front and rear covers of the impeller will form an axial thrust pointing to the suction end. Although traditional solutions such as balancing holes or balancing discs can alleviate the problem, there are disadvantages such as leakage loss or complicated structure.

[0004] Due to the imbalance between radial force and axial force, the operating efficiency of the pump is seriously affected. Traditional balancing measures such as balancing holes will cause fluid leakage, further reducing the efficiency of the pump. The vibration and noise problems of the pump also increase additional energy consumption and reduce the overall operating efficiency.

[0005] The increased bearing wear shortens the bearing replacement cycle and increases maintenance costs. The complex structure of traditional balancing measures makes pump maintenance and repair more difficult.

[0006] Existing pump types have poor performance and are prone to failure when faced with complex working conditions such as high head, corrosive media, and slurry with high solid content. Summary of the invention

[0007] In view of the above problems, the main purpose of the present invention is to provide a new submersible pump balancing structure that can achieve symmetrical offset of fluid pressure, reduce radial force, reduce vibration and noise, and achieve self-balancing of axial force.

[0008] The present invention solves the above technical problems through the following technical solutions: a new type of submersible pump balancing structure, the new type of submersible pump balancing structure includes: a filter, a pump cover, a pump body, an impeller, an impeller nut, a key, and a shaft; the filter is fixed at the pump inlet, the pump body adopts a double volute pump body, and the pump body and the pump cover are detachably fixed together; the impeller is fixed on the pump shaft, the impeller is connected to the shaft through a key on the pump shaft, and an independent impeller flow channel is arranged on the back of the impeller; a partition is arranged inside the double volute pump body.

[0009] In a specific implementation example of the present invention, the filter screen is connected to the pump cover by bolts.

[0010] In a specific implementation example of the present invention, the pump body is connected to the pump cover by bolts.

[0011] In a specific implementation example of the present invention, the impeller is fixed to the pump shaft by a locking nut.

[0012] In a specific implementation example of the present invention, the mesh size of the filter is in the range of 0.2 to 1 mesh.

[0013] In a specific implementation example of the present invention, an independent impeller flow channel is arranged on the back of the impeller, and the blades of the impeller flow channel are cylindrical blades, and the number of blades is 5 to 7.

[0014] In a specific implementation example of the present invention, the partition plate arranged in the double volute pump body is a partition plate cast integrally with the double volute pump body.

[0015] The positive and progressive effect of the present invention is that the new submersible pump balance structure provided by the present invention has the following advantages compared with the common technology:

[0016] The double volute structure of the present invention effectively neutralizes the radial force, reduces the radial force, and reduces bearing wear. Compared with the traditional single volute structure, the vibration and noise problems caused by the imbalance of radial force are significantly reduced.

[0017] The impeller back flow channel design of the present invention realizes self-balancing of axial force without the need for an additional sealing structure, thereby avoiding leakage losses and structural complexity caused by traditional balancing holes or balancing disks.

[0018] The vibration value of the present invention is reduced, the efficiency of the whole machine is improved, and the bearing replacement cycle is extended. Compared with the traditional submersible pump, this solution significantly reduces the maintenance cost while improving the operation stability.

[0019] The invention is particularly suitable for complex working conditions such as high head, corrosive media, slurry with high solid content, etc., and solves the problem that traditional submersible pumps have poor performance under complex working conditions.

[0020] The present invention not only improves the operating stability but also significantly reduces the maintenance cost through the synergistic effect of the double volute and the impeller back flow channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 It is a schematic diagram of the inner partition of the double volute pump body in the present invention.

[0023] The following are the names corresponding to the labels in the present invention:

[0024] Filter 1, pump cover 2, pump body 3, impeller 4, impeller nut 5, key 6, shaft 7, partition 8. DETAILED DESCRIPTION

[0025] Preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to illustrate the technical solutions of the present invention in detail.

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention, Figure 2 This is a schematic diagram of the partition in the double volute pump body of the present invention. As shown in the above figure, the present invention proposes a new submersible pump balance structure, which includes: a filter 1, a pump cover 2, a pump body 3, an impeller 4, an impeller nut 5, a key 6, and a shaft 7; the filter 1 is fixed at the pump inlet, the pump body 3 adopts a double volute pump body, and the pump body 3 and the pump cover 2 are detachably fixed together; the impeller 4 is fixed on the pump shaft 7, and the impeller 4 is connected to the shaft 7 through the key 6 on the pump shaft 7, and an independent impeller flow channel is arranged on the back of the impeller 4; a partition 8 is arranged in the double volute pump body.

[0027] In the specific implementation process of the present invention, the filter screen 1 in the present invention is connected to the pump cover 2 by bolts, the pump body 3 is connected to the pump cover 2 by bolts, and the impeller 4 is fixed to the pump shaft 7 by a locking nut 5.

[0028] The mesh number of the filter 1 ranges from 0.2 to 1 mesh. An independent impeller flow channel is provided on the back of the impeller 4, and the blades of the impeller flow channel are cylindrical blades. The number of blades is selected to be 5 to 7 according to different specific speeds. The above parameters can be replaced with other values ​​or ranges according to specific needs.

[0029] The partition plate arranged in the double volute pump body of the present invention is a partition plate integrally cast with the double volute pump body (see Figure 2 ). In the prior art, submersible pumps mostly adopt a single volute structure, and the problem of radial force imbalance is more prominent. The present invention adopts a double volute structure, which effectively reduces the radial force and significantly reduces vibration and noise through symmetrical offset of fluid pressure.

[0030] Traditional submersible pumps usually use methods such as balancing holes or back blades to balance the axial force, but these methods have problems such as leakage loss or structural complexity. The present invention can achieve self-balancing of the axial force through the design of the impeller back flow channel without the need for an additional sealing structure.

[0031] In the prior art, submersible pumps have poor performance under complex working conditions such as high head, corrosive media, and slurry with high solid content. The present invention not only improves the operating stability but also significantly reduces the maintenance cost through the synergistic effect of the double volute and the impeller back flow channel. In order to illustrate the synergistic effect of the double volute and the impeller back flow channel, the present invention provides the following experimental data, Table 1 and Table 2.

[0032] Table 1: Example pump design parameters: flow: 660m3 / h, head: 28m, speed: 1480r / min

[0033]

[0034] Table 2

[0035]

[0036]

[0037] After comparing the test data of this group of example pumps, the shaft power was reduced and the pump efficiency was significantly improved, indicating that the synergistic effect of the double volute and the impeller back flow channel is obvious.

[0038] In the prior art, the structural design of the submersible pump is relatively complex, and maintenance and repair are relatively difficult. The present invention simplifies the overall design and improves the convenience of maintenance by optimizing the internal structure of the pump body.

[0039] The present invention is particularly suitable for complex working conditions such as high head, corrosive media, slurry with high solid content, etc., and solves the problem of poor performance of traditional submersible pumps under complex working conditions.

[0040] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected, and the scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. A new type of submersible pump balance structure, characterized by: The novel submersible pump balancing structure comprises: a filter screen, a pump cover, a pump body, an impeller, an impeller nut, a key, and a shaft; the filter screen is fixed at the pump inlet, the pump body adopts a double volute pump body, and the pump body and the pump cover are detachably fixed together; the impeller is fixed on the pump shaft, the impeller is connected to the shaft through a key on the pump shaft, and an independent impeller flow channel is arranged on the back of the impeller; a partition is arranged in the double volute pump body.

2. The novel submersible pump balancing structure according to claim 1 is characterized in that: The filter screen is connected to the pump cover by bolts.

3. The novel submersible pump balancing structure according to claim 1 is characterized in that: The pump body is connected to the pump cover by bolts.

4. The novel submersible pump balancing structure according to claim 1 is characterized in that: The impeller is fixed to the pump shaft by a locking nut.

5. The novel submersible pump balancing structure according to claim 1 is characterized in that: The mesh size of the filter ranges from 0.2 to 1 mesh.

6. The novel submersible pump balancing structure according to claim 1 is characterized in that: An independent impeller flow channel is arranged on the back of the impeller, and the blades of the impeller flow channel are cylindrical blades, and the number of the blades is 5 to 7.

7. The novel submersible pump balancing structure according to claim 1 is characterized in that: The partition plate arranged in the double volute pump body is a partition plate cast integrally with the double volute pump body.

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